CN118408682B - Double-station sealing element testing device and testing method - Google Patents
Double-station sealing element testing device and testing method Download PDFInfo
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- CN118408682B CN118408682B CN202410884842.1A CN202410884842A CN118408682B CN 118408682 B CN118408682 B CN 118408682B CN 202410884842 A CN202410884842 A CN 202410884842A CN 118408682 B CN118408682 B CN 118408682B
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- 238000012360 testing method Methods 0.000 title claims abstract description 168
- 238000007789 sealing Methods 0.000 title claims abstract description 90
- 239000003921 oil Substances 0.000 claims abstract description 87
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 50
- 210000004907 gland Anatomy 0.000 claims abstract description 24
- 230000007704 transition Effects 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000033001 locomotion Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/005—Sealing rings
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- General Physics & Mathematics (AREA)
- Actuator (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of performance testing of sealing elements, in particular to a double-station sealing element testing device and a testing method, comprising the following steps: a work table; the first test cylinder and the second test cylinder are correspondingly arranged on the workbench and comprise a test cylinder body and a piston rod; the driving component is arranged between the two piston rods; the two side surfaces of the driving component are provided with pulling pressure sensors, and the piston rod is connected with the pulling pressure sensors through a connecting piece; the two ends of the inner hole of the test cylinder body are respectively provided with a guide sleeve, the inner hole of the guide sleeve is provided with a groove for installing a sealing element, one side of the test cylinder body, which is positioned on the guide sleeve, is provided with a gland, the gland is provided with an oil collecting groove, and a diversion hole is arranged along the radial direction of the oil collecting groove; the hole section of the test cylinder body between the two guide sleeves and the piston rod form a hydraulic oil cavity, and the test cylinder body is provided with an oil inlet path and an oil outlet path. And the double-station test is adopted to evaluate a plurality of sealing elements simultaneously, so that the test efficiency is improved, the sealing elements with different models are evaluated, and the comparability of the sealing test is improved.
Description
Technical Field
The invention relates to the technical field of performance testing of sealing elements, in particular to a double-station sealing element testing device and a double-station sealing element testing method.
Background
The test cylinder is used as an executive component in engineering machinery, and the sealing performance of the test cylinder is particularly important to the overall performance of the test cylinder and is an important part of the test cylinder. In order to better ensure the performance of the test cylinder, and in combination with the application of new materials, the sealing element of the test cylinder is improved, and the improved sealing element performance needs to be tested continuously.
Traditional sealing member testing arrangement only is equipped with a test station generally, can only test same sealing member in a time quantum for sealing test cycle is lengthy, test inefficiency, and when different sealing members are tested in different time quantum, probably face different external environment conditions, can lead to the inconsistency of test result, causes the test accuracy and the comparability of sealing member test lower.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the double-station sealing element testing device and the double-station sealing element testing method effectively solve the problems in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a duplex seal testing apparatus comprising:
The workbench is provided with a first station and a second station;
The first test cylinder and the second test cylinder are correspondingly arranged on the first station and the second station, each test cylinder comprises a test cylinder body and a piston rod arranged in the test cylinder body, and the two piston rods are coaxially arranged;
The driving assembly is arranged between the two piston rods and comprises a servo electric cylinder arranged below the workbench and a driving block connected with a driving rod of the servo electric cylinder;
The driving block is provided with a driving block, wherein the driving block is provided with a driving block, a driving block and a driving block, and the driving block is connected with the driving block;
the two ends of the inner hole of the test cylinder body are respectively provided with a guide sleeve, the inner hole of the guide sleeve is provided with a groove for installing a sealing element, a gland is arranged on one side of the test cylinder body, which is positioned on the guide sleeve, the gland is fixed on the test cylinder body, an oil collecting groove is arranged at the inner hole position of the gland, which is close to one side of the guide sleeve, and a diversion hole is arranged along the radial direction of the oil collecting groove;
the test cylinder body is positioned in an annular gap between the hole sections between the two guide sleeves and the piston rod to form a hydraulic oil cavity, and an oil inlet passage and an oil outlet passage which are communicated with the hydraulic oil cavity are arranged in the test cylinder body.
Further, a detection hole communicated with the hydraulic oil cavity is formed in the test cylinder body, and a temperature sensor is arranged in the detection hole so as to monitor the temperature of hydraulic oil in the hydraulic oil cavity.
Further, supporting sleeves are arranged on two sides of the hydraulic oil cavity in the test cylinder body, and the diameter of an inner hole of each supporting sleeve is smaller than that of the section inner hole of the hydraulic oil cavity;
At least one annular groove is arranged at the inner hole of the supporting sleeve.
Further, a connecting piece is arranged between the piston rod and the tension pressure sensor; the connecting piece comprises a spherical hinge lug fixed at the end part of the piston rod and a connecting seat arranged on the pull pressure sensor and connected with the spherical hinge lug;
the spherical hinge ear rings are perpendicular to the hinge shaft of the connecting seat.
Further, the method comprises the steps of,
The workbench is provided with a guide rail, the driving blocks are arranged on the guide rail in a sliding manner, the driving blocks are positioned on two side edges of the guide rail, side plates extend downwards, a transmission block is arranged between the two side plates, and the servo electric cylinder is connected with the transmission block.
Further, the oil collecting groove comprises a first oil guide ring surface and a second oil guide ring surface, wherein the first oil guide ring surface and the second oil guide ring surface are obliquely arranged and gradually spread outwards along the direction towards the circle center;
and the inclined end parts of the first oil guide ring surface and the second oil guide ring surface are respectively provided with a transition ring surface, and the diameter of each transition ring surface is smaller than the diameter of an inner hole of the guide sleeve, so that hydraulic oil enters the oil collecting groove through the transition ring surfaces.
Further, the side wall of the first oil guide ring surface close to one side of the guide sleeve extends towards the guide sleeve to form a transition edge;
the end face of the transition edge protrudes out of the locking end face of the gland and is in close contact with the end face of the guide sleeve.
Further, the transition edge is inclined towards the circle center direction of the guide sleeve, a plurality of diversion trenches are arranged on the inner ring surface of the transition edge, and the diversion trenches are uniformly distributed along the circumferential direction;
And a plurality of guide grooves are communicated with the oil collecting groove so that oil liquid is converged towards the oil collecting groove.
Further, one end of the piston rod, which is far away from the driving assembly, is provided with a dynamic compensation driving piece;
The dynamic compensation driving piece can push the piston rod on the corresponding side to move towards the direction of the driving assembly so as to test the friction force of the sealing piece in the opposite station.
The invention also provides a double-station sealing element testing method, which adopts the double-station sealing element testing device and comprises the following steps:
Starting a hydraulic pump, pressurizing a hydraulic oil cavity through an oil inlet path, and ensuring that the system pressure reaches the test requirement;
starting a driving assembly to enable the two piston rods to synchronously move, and simulating the actual working condition of the sealing element;
monitoring and recording the starting friction force and the static friction force on the two stations in real time by using a pull pressure sensor so as to evaluate the contact and the cooperation between the sealing element and the piston rod;
Observing whether hydraulic oil leaks from a gap of the sealing element in the movement process of the piston rod, allowing the leaked oil to flow into the oil collecting groove, collecting the leaked oil to an external collecting device through the guide hole, and measuring the collected hydraulic oil quantity to evaluate the sealing performance of the sealing element;
analyzing friction force data and leakage rate, and comprehensively evaluating friction characteristics and sealing performance of the sealing element;
comparing and analyzing the test results of the two test cylinders to obtain comparison results of different sealing element performances;
And generating a detailed test report according to the test data and the analysis result, and ensuring the traceability of the test process.
The beneficial effects of the invention are as follows: according to the invention, double-station testing is adopted, so that a plurality of sealing elements can be evaluated at the same time in a single time period, the testing efficiency is improved, the influence of external environment difference on test data is avoided, the accuracy of the test is improved, and the double-station synchronous testing can be carried out, the sealing elements with different types can be selected for evaluation according to different testing requirements, so that the performances of different sealing elements can be directly compared, and the comparability of the sealing test is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic perspective view of a dual seal testing apparatus according to an embodiment of the present invention;
FIG. 2 is a front view of a duplex seal testing apparatus in an embodiment of the invention;
FIG. 3 is a top view of a duplex seal testing apparatus in an embodiment of the invention;
FIG. 4 is a cross-sectional view of a duplex seal testing apparatus in an embodiment of the invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
FIG. 6 is a schematic diagram illustrating the installation of a temperature sensor according to an embodiment of the present invention;
FIG. 7 is a schematic view of the installation of the guide sleeve, support sleeve and gland in an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating connection between a driving block and a driving block according to an embodiment of the present invention;
FIG. 9 is a schematic view of a structure of a sump according to an embodiment of the invention;
FIG. 10 is a schematic view of a press cover according to an embodiment of the present invention;
FIG. 11 is a schematic view of the position of the transition edge when the guide sleeve protrudes from the end face of the test cylinder in the embodiment of the invention;
FIG. 12 is a schematic view showing the position of the transition edge when the guide sleeve is lower than the end face of the test cylinder in the embodiment of the invention;
FIG. 13 is a schematic diagram of the installation position of the dynamic compensation driving member according to the embodiment of the present invention.
Reference numerals: 1. a work table; 2. a first test cylinder; 21. a test cylinder; 21a, a hydraulic oil chamber; 21b, an oil inlet path; 21c, an oil outlet path; 21d, detection holes; 22. a piston rod; 23. guide sleeve; 231. a groove; 24. a gland; 241. an oil sump; 2411. a first oil-guiding annulus; 2412. the second oil guide ring surface; 2413. a transitional torus; 2414. a transition edge; 2414a, flow guide grooves; 242. a deflector aperture; 25. a support sleeve; 25a, annular groove; 3. a second test cylinder; 4. a drive assembly; 41. a servo electric cylinder; 42. a driving block; 43. a guide rail; 44. a transmission block; 5. a temperature sensor; 6. a connecting piece; 61. spherical hinge ear rings; 62. a connecting seat; 7. a pull pressure sensor; 8. dynamically compensating the driving member.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
A duplex seal testing apparatus as shown in fig. 1 to 13, comprising: the workbench 1 is provided with a first station and a second station; the first test cylinder 2 and the second test cylinder 3 are correspondingly arranged on a first station and a second station, and each test cylinder comprises a test cylinder body 21 and a piston rod 22 arranged in the test cylinder body 21, and the two piston rods 22 are coaxially arranged; the driving assembly 4 is arranged between the two piston rods 22, and the driving assembly 4 comprises a servo electric cylinder 41 arranged below the workbench 1 and a driving block 42 connected with a driving rod of the servo electric cylinder 41;
Wherein, the two sides of the driving block 42 facing the two piston rods 22 are respectively provided with a pulling pressure sensor 7, and the piston rods 22 are connected with the pulling pressure sensors 7; the two ends of the inner hole of the test cylinder body 21 are respectively provided with a guide sleeve 23, the inner hole of the guide sleeve 23 is provided with a groove 231 for installing a sealing element, one side of the test cylinder body 21, which is positioned on the guide sleeve 23, is provided with a gland 24, the gland 24 is fixed on the test cylinder body 21, the inner hole of the gland 24, which is close to one side of the guide sleeve 23, is provided with an oil collecting groove 241, and a diversion hole 242 is arranged along the radial direction of the oil collecting groove 241; the annular gap between the hole section of the test cylinder 21 between the two guide sleeves 23 and the piston rod 22 forms a hydraulic oil chamber 21a, and an oil inlet path 21b and an oil outlet path 21c communicating with the hydraulic oil chamber 21a are provided in the test cylinder 21.
In the implementation process, the sealing elements are pre-installed in the grooves 231 of the guide sleeve 23, the guide sleeve 23 and the gland 24 are sequentially installed on two sides of the test cylinder body along the axis, specifically, two guide sleeves 23 and two glands 24 are installed on one test cylinder body, a symmetrical sealing element test structure is formed in the same test cylinder body, two sealing elements can be tested at the same time, and the two test cylinders with double stations can select guide sleeves 23 with different types for the two test cylinder bodies according to the testing requirements of the sealing elements, so that the sealing elements with different types can be tested conveniently; in the specific test process, the driving assembly 4 is used for driving the two piston rods 22 to synchronously move, so that the test conditions are consistent. The friction force on the two piston rods 22 is measured by using the tension pressure sensors 7 arranged on two sides of the driving assembly 4, the data recorded by the tension pressure sensors 7 are analyzed, and the friction characteristics of the sealing element are evaluated, namely, lower starting friction force and static friction force generally indicate better contact and matching between the sealing element and the piston rods 22; when the piston rod 22 is in reciprocating motion, a small amount of hydraulic oil flows out through the clearance of the sealing element, the hydraulic oil firstly flows into the oil collecting groove 241 near the gland 24, the hydraulic oil in the oil collecting groove 241 is discharged through the flow guide hole 242 and then is collected into an external collecting device, the amount of the discharged hydraulic oil is measured, the sealing performance of the sealing element is evaluated, namely, a smaller leakage amount shows better sealing effect, and in addition, the friction force and the leakage rate of the two test cylinders are analyzed and compared, so that the comparison result of the performances of different sealing elements is obtained.
According to the invention, double-station testing is adopted, so that a plurality of sealing elements can be evaluated at the same time in a single time period, the testing efficiency is improved, the influence of external environment difference on test data is avoided, the accuracy of the test is improved, and the double-station synchronous testing can be carried out, the sealing elements with different types can be selected for evaluation according to different testing requirements, so that the performances of different sealing elements can be directly compared, and the comparability of the sealing test is improved.
In the durability test of the sealing member, as the temperature of the hydraulic oil increases, the sealing performance of the sealing member is lowered, thereby affecting the test effect, and as shown in fig. 5 to 6, a detection hole 21d communicating with the hydraulic oil chamber 21a is provided in the test cylinder 21, and a temperature sensor 5 is installed in the detection hole 21d to monitor the temperature of the hydraulic oil in the hydraulic oil chamber 21 a. Through the setting of temperature sensor 5, can real-time supervision temperature variation to in time discover fluid high temperature phenomenon, ensure that hydraulic oil is in the best working range, maintain the uniformity of test condition and the accuracy of test result.
In the invention, the guide sleeves 23 are arranged at two ends of the test cylinder body 21, in order to avoid the phenomenon that the piston rod 22 bends and inclines in the hydraulic oil cavity 21a, which causes frictional wear on one side of the sealing element and affects the sealing performance test result, as shown in fig. 7, support sleeves 25 are arranged at two sides of the hydraulic oil cavity 21a in the test cylinder body 21, and the diameter of the inner hole of each support sleeve 25 is smaller than the diameter of the inner hole of the section of the hydraulic oil cavity 21 a; the hydraulic oil is ensured to smoothly pass through, and simultaneously, the vibration generated when the piston rod 22 moves can be absorbed and reduced, so that the noise is reduced, the stable operation of the system is improved, and at least one annular groove 25a is arranged at the inner hole of the supporting sleeve 25, so that the piston rod 22 is supported along the axial multiple points. The supporting force can be more uniformly distributed on the piston rod 22, and the stability of the transmission of the piston rod 22 is effectively ensured.
In order to avoid the problem of blocking of the two piston rods 22 due to the small offset of the piston rods 22 during the test operation caused by the error of the mounting coaxiality, a connecting piece 6 is arranged between the piston rods 22 and the tension and pressure sensor 7; the connecting piece 6 comprises a spherical hinge lug 61 fixed at the end part of the piston rod 22 and a connecting seat 62 arranged on the pull pressure sensor 7 and connected with the spherical hinge lug 61; the spherical hinge ear ring 61 is arranged perpendicular to the hinge axis of the connection seat 62. Through the structure of the spherical hinge ear ring 61, a certain range of swinging angles can be provided, and coaxiality errors of the two piston rods 22 in the installation process can be automatically compensated, so that the driving assembly 4 smoothly transmits pushing force or pulling force to the piston rods 22, and loads are allowed to swing in a horizontal plane, so that the problem of inaccurate centering of the piston rods 22 caused by angle change is avoided, friction between the piston rods 22 and the inner wall of a hydraulic cylinder is effectively reduced, and abrasion is reduced.
In the preferred embodiment, a guide rail 43 is provided on the workbench 1, a driving block 42 is slidably provided on the guide rail 43, the driving block 42 is located at two side edges of the guide rail 43 and extends downwards to form side plates, a transmission block 44 is provided between the two side plates, and the servo cylinder 41 is connected with the transmission block 44.
The servo cylinder 41 has good vibration control characteristics and helps to reduce vibration and noise during testing. The servo electric cylinder 41 drives the connected driving block 42, so that synchronous movement of the two piston rods 22 can be realized, which is important for comparing the performances of different sealing elements, and the design of the guide rail 43 is beneficial to reducing errors in the movement process of the driving block 42 and improving the accuracy of the test.
As shown in fig. 9, the oil sump 241 in the preferred embodiment of the present invention includes a first oil guiding ring surface 2411 and a second oil guiding ring surface 2412, wherein the first oil guiding ring surface 2411 and the second oil guiding ring surface 2412 are inclined and gradually spread outwards along the direction toward the center of the circle; and a transition annular surface 2413 is provided at the inclined ends of the first oil guiding ring surface 2411 and the second oil guiding ring surface 2412, and the diameter of the transition annular surface 2413 is smaller than the diameter of the inner hole of the guide sleeve 23, so that hydraulic oil enters the oil collecting groove 241 through the transition annular surface 2413.
Specifically, the first oil guiding ring surface 2411 and the second oil guiding ring surface 2412 form a V-shaped oil collecting groove 241, and drain the hydraulic oil leaked from the piston rod 22 and the sealing member to flow to the bottom of the oil collecting groove 241, thereby improving the collection efficiency; and the transition ring faces 2413 are arranged on two sides of the opening of the oil collecting groove 241, and the diameter of the transition ring faces 2413 is smaller than the diameter of the inner hole of the guide sleeve 23, so that the width of the oil collecting port of the oil collecting groove 241 is increased, a buffer area is provided for oil carried out in the movement process of the piston rod 22, the oil is prevented from directly impacting the edge of the oil collecting groove 241, and foam and splashing are reduced.
In the invention, during the test of a sealing element, a small amount of hydraulic oil in a hydraulic oil cavity 21a can be carried out by the piston rod 22, however, during the installation of a gland 24, the processing error of a guide sleeve 23 can lead to the end surface of the guide sleeve 23 to be protruded or lower than the end surface of a test cylinder 21, and during the installation of the gland 24 on the test cylinder 21, along with the increase of locking force, the outer edge end surface of the gland 24 is contacted with the end surface of the guide sleeve 23, the inner end surface area of an oil collecting groove 241 can be jacked up by the end surface of the guide sleeve 23, so that an included angle is formed between the inner edge end surface of the oil collecting groove 241 and the end surface area of the guide sleeve 23, and part of the hydraulic oil carried out by a piston rod 22 can enter the included angle area instead of directly flowing into the oil collecting groove 241, which can lead to the oil to leak outside along the gap of the gland 24 or the test cylinder 21, and seriously affect the test result of the sealing performance of the sealing element, therefore, as shown in fig. 10-12, the side wall of a first oil guiding ring surface 2411 near one side of the guide sleeve 23 extends towards the guide sleeve 23, forming a transition edge 2414; the end face of the transition edge 2414 protrudes out of the locking end face of the gland 24 and is in tight contact with the end face of the guide sleeve 23, so that hydraulic oil carried out by the piston rod 22 is conducted through the transition edge 2414 and directly flows into the oil collecting groove 241, and then is discharged into the collecting device through the flow guide hole 242, and the hydraulic oil is effectively prevented from being directly leaked to the external environment.
On the basis of the embodiment, the transition edge 2414 is inclined towards the center direction of the guide sleeve 23, and a plurality of diversion trenches 2414a are arranged on the inner annular surface of the transition edge 2414, and the diversion trenches 2414a are uniformly distributed along the circumferential direction; and a plurality of diversion grooves 2414a are communicated with the oil collecting groove 241 so as to make the oil flow to the oil collecting groove 241 converge. When the end face of the guide sleeve 23 is lower than the end face of the test cylinder 21 or is level with the end face of the test cylinder, the outer side face of the transition edge 2414 is extruded by the guide sleeve 23 and is influenced by the gaps of the guide grooves 2414a of the inner side face, the outer side face is gathered inwards, the end edge of the transition edge 2414 is close to the piston rod 22 until the gland 24 is locked on the test cylinder 21, at this time, a gap still exists between the transition edge 2414 and the piston rod 22, and hydraulic oil enters the oil collecting groove 241 under the drainage effect of the transition edge 2414.
When the starting friction force and the static friction force are measured, the possible friction difference of the sealing elements on the two stations is considered, the driving assembly 4 needs to overcome the maximum friction force to enable the two piston rods 22 to synchronously act, the action is started only when the maximum starting friction force is reached, the actual friction force on the side with smaller friction force can not be accurately measured, and therefore, as shown in fig. 13, the dynamic compensation driving element 8 is arranged at the end of the piston rod 22 away from the driving assembly 4; the dynamic compensation drive 8 is able to push the piston rod 22 on the corresponding side towards the drive assembly 4 for testing the friction against the seals in the station.
The two dynamic compensation driving parts 8 independently test the sealing parts on each station, and even if friction difference exists, the friction force on each side can be accurately measured, so that the performance of the sealing parts under the actual working condition can be accurately simulated and tested, and the accurate starting friction force and static friction force can be obtained; in the test process, in the process of driving the piston rods 22, alternative motion is adopted, based on feedback of a sensor, the control system automatically adjusts compensation force, so that friction forces applied to the two piston rods 22 in the starting and static states are ensured to be consistent or within an expected range, and accuracy of test results is improved. In addition, in the synchronous test process of the double-station, the dynamic compensation driving piece 8 is utilized to balance the friction force of the corresponding sides, so that the two piston rods 22 quickly respond, the required driving force of the driving assembly 4 is reduced, and the test efficiency is improved. The dynamic compensation driving member 8 may be driven by a hydraulic cylinder, an air cylinder or a screw nut, but is not limited to the above linear driving structure, and may be directly connected with the piston rod 22 during driving, or directly abutted.
The invention also provides a double-station sealing element testing method, which adopts the double-station sealing element testing device and comprises the following steps:
Starting a hydraulic pump, and pressurizing the hydraulic oil cavity 21a through the oil inlet path 21b to ensure that the system pressure reaches the test requirement;
starting the driving assembly 4 to enable the two piston rods 22 to synchronously move, and simulating the actual working condition of the sealing element;
the starting friction force and the static friction force on the two stations are monitored and recorded in real time by using the tension pressure sensor 7 so as to evaluate the contact and the matching between the sealing element and the piston rod 22;
Observing whether or not hydraulic oil leaks from the seal gap during the movement of the piston rod 22, the leaked oil flows into the oil sump 241 and is collected to an external collecting device through the guide hole 242, and measuring the collected hydraulic oil amount to evaluate the sealing performance of the seal;
analyzing friction force data and leakage rate, and comprehensively evaluating friction characteristics and sealing performance of the sealing element;
comparing and analyzing the test results of the two test cylinders to obtain comparison results of different sealing element performances;
And generating a detailed test report according to the test data and the analysis result, and ensuring the traceability of the test process.
The testing method ensures consistency of testing conditions and comparability of testing results by precisely controlling pressure of a hydraulic system and synchronously driving the two piston rods 22, and can accurately evaluate friction characteristics and sealing performance of the sealing element by utilizing the tension pressure sensor 7 to monitor friction force in real time and collecting and measuring leakage oil quantity through the oil collecting groove 241 and the diversion hole 242 system. The testing process not only improves the testing efficiency, allows two sealing elements to be tested and compared at the same time, but also enhances the safety and reliability of the test.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A duplex seal testing apparatus, comprising:
The workbench is provided with a first station and a second station;
The first test cylinder and the second test cylinder are correspondingly arranged on the first station and the second station, each test cylinder comprises a test cylinder body and a piston rod arranged in the test cylinder body, and the two piston rods are coaxially arranged;
The driving assembly is arranged between the two piston rods and comprises a servo electric cylinder arranged below the workbench and a driving block connected with a driving rod of the servo electric cylinder; the driving block is provided with a driving block, wherein the driving block is provided with a driving block, a driving block and a driving block, and the driving block is connected with the driving block;
the two ends of the inner hole of the test cylinder body are respectively provided with a guide sleeve, the inner hole of the guide sleeve is provided with a groove for installing a sealing element, a gland is arranged on one side of the test cylinder body, which is positioned on the guide sleeve, the gland is fixed on the test cylinder body, an oil collecting groove is arranged at the inner hole position of the gland, which is close to one side of the guide sleeve, and a diversion hole is arranged along the radial direction of the oil collecting groove;
The test cylinder body is positioned in an annular gap between the hole section between the two guide sleeves and the piston rod to form a hydraulic oil cavity, and an oil inlet passage and an oil outlet passage which are communicated with the hydraulic oil cavity are arranged in the test cylinder body;
The oil collecting groove comprises a first oil guide ring surface and a second oil guide ring surface, wherein the first oil guide ring surface and the second oil guide ring surface are obliquely arranged and gradually spread outwards along the direction towards the circle center;
The inclined ends of the first oil guide ring surface and the second oil guide ring surface are respectively provided with a transition ring surface, and the diameter of each transition ring surface is smaller than the diameter of an inner hole of the guide sleeve, so that hydraulic oil enters the oil collecting groove through the transition ring surfaces;
the side wall of the first oil guide ring surface, which is close to one side of the guide sleeve, extends towards the guide sleeve to form a transition edge;
the end face of the transition edge protrudes out of the locking end face of the gland and is in close contact with the end face of the guide sleeve.
2. The duplex seal testing apparatus according to claim 1, wherein a detection hole communicating with the hydraulic oil chamber is provided in the test cylinder, and a temperature sensor is installed in the detection hole to monitor the temperature of the hydraulic oil in the hydraulic oil chamber.
3. The double-station sealing member testing device according to claim 1, wherein supporting sleeves are arranged on two sides of the hydraulic oil cavity in the testing cylinder body, and the inner hole diameter of each supporting sleeve is smaller than the cross-section inner hole diameter of the hydraulic oil cavity;
At least one annular groove is arranged at the inner hole of the supporting sleeve.
4. The double-station seal testing device according to claim 1, wherein a connecting piece is arranged between the piston rod and the pull pressure sensor, and the connecting piece comprises a spherical hinge ear fixed at the end part of the piston rod and a connecting seat arranged between the pull pressure sensor and the spherical hinge ear;
the spherical hinge ear rings are perpendicular to the hinge shaft of the connecting seat.
5. The duplex seal testing apparatus of claim 1 wherein,
The workbench is provided with a guide rail, the driving blocks are arranged on the guide rail in a sliding manner, the driving blocks are positioned on two side edges of the guide rail, side plates extend downwards, a transmission block is arranged between the two side plates, and the servo electric cylinder is connected with the transmission block.
6. The double-station sealing member testing device according to claim 1, wherein the transition is inclined towards the center of the guide sleeve, a plurality of diversion trenches are arranged on the inner ring surface of the transition edge, and the diversion trenches are uniformly distributed along the circumferential direction;
And a plurality of guide grooves are communicated with the oil collecting groove so that oil liquid is converged towards the oil collecting groove.
7. The duplex seal testing apparatus of claim 1 wherein an end of the piston rod remote from the drive assembly is provided with a dynamic compensation drive;
The dynamic compensation driving piece can push the piston rod on the corresponding side to move towards the direction of the driving assembly so as to test the friction force of the sealing piece in the opposite station.
8. A duplex seal testing method employing the duplex seal testing apparatus of any of claims 1-7, comprising the steps of:
Starting a hydraulic pump, pressurizing a hydraulic oil cavity through an oil inlet path, and ensuring that the system pressure reaches the test requirement;
starting a driving assembly to enable the two piston rods to synchronously move, and simulating the actual working condition of the sealing element;
monitoring and recording the starting friction force and the static friction force on the two stations in real time by using a pull pressure sensor so as to evaluate the contact and the cooperation between the sealing element and the piston rod;
Observing whether hydraulic oil leaks from a gap of the sealing element in the movement process of the piston rod, allowing the leaked oil to flow into the oil collecting groove, collecting the leaked oil to an external collecting device through the guide hole, and measuring the collected hydraulic oil quantity to evaluate the sealing performance of the sealing element;
analyzing friction force data and leakage rate, and comprehensively evaluating friction characteristics and sealing performance of the sealing element;
comparing and analyzing the test results of the two test cylinders to obtain comparison results of different sealing element performances;
And generating a detailed test report according to the test data and the analysis result, and ensuring the traceability of the test process.
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| CN109060270A (en) * | 2018-08-28 | 2018-12-21 | 浙江工业大学 | It is a kind of can on-line checking slip and frictional force reciprocation sealing experimental provision |
| CN115254643A (en) * | 2022-06-27 | 2022-11-01 | 武汉大卉智能科技有限公司 | Automatic detection device and method for air tightness of medical easy-to-break plug |
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| GB503149A (en) * | 1937-10-01 | 1939-04-03 | Variable Speed Gear Ltd | Improvements in or relating to shaft packing or sealing devices |
| JP5738447B1 (en) * | 2014-03-05 | 2015-06-24 | ジャパン・ハムワージ株式会社 | Rotary vane steering actuator internal hydraulic chamber sealing system |
| CN208100245U (en) * | 2018-02-05 | 2018-11-16 | 王帅 | A kind of feeding device of mold dimension |
| US11555571B2 (en) * | 2020-02-12 | 2023-01-17 | Saudi Arabian Oil Company | Automated flowline leak sealing system and method |
| JP6934099B1 (en) * | 2020-09-14 | 2021-09-08 | 株式会社コスモ計器 | Gas leak detector, gas leak detection setting method, gas leak detection method, program |
| CN114087248B (en) * | 2021-11-02 | 2022-07-26 | 浙江海宏液压科技股份有限公司 | Reversing valve |
| CN219121661U (en) * | 2022-12-26 | 2023-06-02 | 北京和瑞储能科技有限公司 | Valve testing device |
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| CN109060270A (en) * | 2018-08-28 | 2018-12-21 | 浙江工业大学 | It is a kind of can on-line checking slip and frictional force reciprocation sealing experimental provision |
| CN115254643A (en) * | 2022-06-27 | 2022-11-01 | 武汉大卉智能科技有限公司 | Automatic detection device and method for air tightness of medical easy-to-break plug |
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