CN107063677B - Weighing valve performance test bed - Google Patents
Weighing valve performance test bed Download PDFInfo
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- CN107063677B CN107063677B CN201710499365.7A CN201710499365A CN107063677B CN 107063677 B CN107063677 B CN 107063677B CN 201710499365 A CN201710499365 A CN 201710499365A CN 107063677 B CN107063677 B CN 107063677B
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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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Abstract
The invention provides a weighing valve performance test bed which comprises a test bed frame (1), a pressure bearing plate (2), a weighing valve (3), a control unit (4), a loading mechanism (5), an air charging/exhausting mechanism (6), a proportional valve (7) and a weighing sensor (8), wherein the pressure bearing plate (2) is fixedly arranged on the test bed frame (1), the weighing valve (3) is arranged below the pressure bearing plate (2), the loading mechanism (5) is arranged below the weighing valve (3), the weighing sensor (8) is arranged on the loading mechanism (5), the control unit (4) is respectively and electrically connected with the loading mechanism (5), the air charging/exhausting mechanism (6) and the weighing sensor (8), and the proportional valve (7) is arranged between the control unit (4) and the loading mechanism (5). The invention has the advantages of simple structure, convenient operation, high test precision, wide test range, capability of realizing closed-loop feedback and the like, ensures the reliability of the detection quality and lightens the working strength of testers.
Description
Technical Field
The invention relates to the field of product detection and test devices, in particular to a weighing valve performance test bed.
Background
The weighing valve is used as a part of an empty and heavy vehicle adjusting device of the railway wagon, and plays an important role in the running safety of the railway wagon. The weighing valve is arranged between a framework of the bogie and an axle box spring or between a swing bolster and a sleeper spring, the weight of the vehicle shared by the bogie spring directly acts on the weighing valve to generate a pressure signal proportional to the weight of the vehicle, the pressure signal enters a regulating valve of the empty and heavy vehicle regulating device, the regulating valve outputs different brake cylinder pressure values according to different pressure signals, the larger the weight of the truck is, the larger the pressure signal output by the weighing valve is, and the larger the pressure value of the brake cylinder is, so that the purpose that the pressure of the brake cylinder is increased along with the increase of the weight of the railway truck is achieved.
At present, the platform control form of the capability test of weighing valve is comparatively single, and the measuring accuracy is not high, and its operation adopts artifical manual control, often can increase tester's operating pressure and working strength, causes easily to miss, erroneous judgement, and the testing result in the testing process of weighing valve simultaneously does not carry out feedback control to loading device, has also increased test error in intangible, influences testing result and production quality, has certain hidden danger to the safe handling of weighing valve product.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the weighing valve performance test bed is simple in structure, has the function of closed-loop feedback, can timely adjust and feed back the pressure value of a test, has high test precision, and is simple and convenient to operate.
The technical problem to be solved by the invention is realized by adopting the following technical scheme: a weighing valve performance test bed comprises a test bed frame, a bearing plate, a weighing valve, a control unit, a loading mechanism and an air charging/exhausting mechanism, wherein the bearing plate is fixedly arranged on the test bed frame, the weighing valve is arranged below the bearing plate, the loading mechanism is arranged below the weighing valve, the air charging/exhausting mechanism is connected with an interface of the weighing valve, and the control unit is respectively and electrically connected with the loading mechanism and the air charging/exhausting mechanism.
Preferably, the loading mechanism is provided with a weighing sensor, and the weighing sensor is electrically connected with the control unit.
Preferably, the loading mechanism comprises an oil cylinder and a hydraulic station, and the oil cylinder is connected with the hydraulic station through a pipeline.
Preferably, the loading mechanism is provided with a proportional valve, a body of the proportional valve is installed on the hydraulic station, and a control part of the proportional valve is electrically connected with the control unit.
Preferably, the top of the weighing valve is installed in contact with the bearing plate, and an installation gap is reserved between the bottom of the weighing valve and a contact of the oil cylinder.
Preferably, the inflation/exhaust mechanism comprises an inflation mechanism and an exhaust mechanism, one end of the inflation mechanism is connected with the air inlet of the weighing valve, the other end of the inflation mechanism is connected with an air pump, one end of the exhaust mechanism is connected with the air outlet of the weighing valve, and the other end of the exhaust mechanism is communicated with the atmosphere.
Preferably, the inflation mechanism comprises a pressure reducing valve, an inflation solenoid valve and an input sensor, and the pressure reducing valve, the inflation solenoid valve and the input sensor are sequentially connected through a pipeline.
Preferably, the exhaust mechanism comprises an output sensor and an exhaust electromagnetic valve, and the output sensor and the exhaust electromagnetic valve are sequentially connected through a pipeline.
Preferably, a part of ports of the control unit are electrically connected with the D/A converter and the A/D converter, and the other part of ports are electrically connected with the charging solenoid valve and the discharging solenoid valve.
Preferably, the D/A converter is electrically connected with a control part of the proportional valve, the A/D converter is connected with a weighing sensor, an input sensor and an output sensor, and the inflation electromagnetic valve and the exhaust electromagnetic valve control the on-off of a pipeline of the inflation/exhaust mechanism.
Compared with the prior art, the invention has the beneficial effects that: the test board is simple in integral structure, the loading mechanism, the air charging/discharging mechanism, the proportional valve and the control unit are reasonably arranged and are mutually connected and matched, so that the loading test precision of the weighing valve is higher, meanwhile, the functions of closed-loop feedback are achieved in the processes of loading test and test result evaluation, the test precision and the reliability of a detection result are further improved, the automatic control and manual point control of the test process can be achieved in the whole test process, the test efficiency is improved, the test steps are simplified, the working intensity of testers is reduced, and the labor cost is saved.
Drawings
FIG. 1 is a schematic diagram of the connection of the components of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
Fig. 3 is a flow chart of the operation of the present invention.
The labels in the figure are: the test bed comprises a test bed 1, a pressure bearing plate 2, a weighing valve 3, a control unit 4, a loading mechanism 5, an oil cylinder 501, a hydraulic station 502, an air charging/discharging mechanism 6, an air charging mechanism 601, a pressure reducing valve 601a, an air charging electromagnetic valve 601b, an input sensor 601c, an air discharging mechanism 602, an output sensor 602a, an air discharging electromagnetic valve 602b, a proportional valve 7, a weighing sensor 8, a D/A converter 9, an A/D converter 10, a ball valve 11, a touch display screen 12, a printing device 13 and a jog switch 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in 1~3, a weighing valve performance test bed comprises a test bed frame 1, a pressure bearing plate 2, a weighing valve 3, a control unit 4, a loading mechanism 5, an air charging/discharging mechanism 6, a proportional valve 7, a weighing sensor 8, a D/a converter 9 and an a/D converter 10, wherein the pressure bearing plate 2, the weighing valve 3, the control unit 4, the loading mechanism 5 and the air charging/discharging mechanism 6 are all arranged on the test bed frame 1, the weighing valve 3 is arranged at the lower part of the pressure bearing plate 2, the top of the weighing valve 3 is in contact with the pressure bearing plate 2, the loading mechanism 5 is arranged below the weighing valve 3, the loading mechanism 5 comprises an oil cylinder 501 and a hydraulic station 502, the weighing sensor 8 is arranged on a contact of the oil cylinder 501, the hydraulic station 502 provides power for the oil cylinder 501, a valve body of the proportional valve 7 is installed in a pipeline of the hydraulic station 502, a control part of the proportional valve 7 is electrically connected with the D/A converter 9, the other end of the D/A converter 9 is connected with the control unit 4, a certain installation gap is reserved between a mandril at the bottom of the weighing valve 3 and a contact of the oil cylinder 501, the contact of the oil cylinder 501 is gradually contacted with the mandril of the weighing valve 3 in the ascending process of the oil cylinder 501, the oil cylinder 501 pushes the mandril of the weighing valve 3 to move upwards to open a valve port inside the weighing valve 3, the inflating mechanism 601 is communicated with the exhaust mechanism 602, the opening degree of the valve port of the weighing valve 3 is proportional to the output air pressure of the exhaust mechanism 602, and if the loading load (t) is 2.5, the output air pressure (kPa) is 60; when the loading load (t) is 6.5, the output air pressure (kPa) is 235; when the loading load (t) was 12, the output air pressure (kPa) was 405. The inflating mechanism 601 is formed by connecting a ball valve 11, a pressure reducing valve 601a, an inflating electromagnetic valve 601b, an input sensor 601c and a pressure gauge sequentially through a pipeline, one end of the pipeline is connected with an input interface of the weighing valve 3, and the other end of the pipeline is connected with an air source, such as an air pump. The exhaust mechanism 602 is formed by sequentially connecting an output sensor 602a, an exhaust electromagnetic valve 602b and a pressure gauge through a pipeline, one end of the pipeline is connected with an output interface of the weighing valve 3, and the other end of the pipeline is communicated with the atmosphere.
The control unit 4 is further connected with an A/D converter 10, the A/D converter 10 can convert analog signals sent by the input sensor 601c and the output sensor 602a into digital signals, the control unit 4 is further connected with a D/A converter 9 touch display screen 12 and a printing device 13, the D/A converter 9 can convert the digital signals sent by the control unit 4 into the analog signals, an operator can write a test program through the touch display screen 12 to control a test process, the operator can manually control the lifting of the oil cylinder 501 through the inching switch 14, and the printing device 13 can print a test result.
During testing, the ball valve 11 is manually opened, pressure air provided by an air source enters the air inlet end of the weighing valve 3 through the pressure reducing valve 601a and the inflation electromagnetic valve 601b, wherein the pressure reducing valve 601a reduces the pressure in the pipe to a pressure value set in the testing and keeps stable, the opening and closing of the inflation electromagnetic valve 601b are controlled by the control unit 4, the inflation electromagnetic valve 601b connected in the main pipeline realizes the inflation starting and stopping of the main pipeline when the inflation electromagnetic valve 601b works, and the inflation electromagnetic valve 601b connected in the branch pipeline is responsible for discharging redundant pressure air in the main pipeline to the atmosphere. The hydraulic station 502 does not work in an initial working state, a certain installation gap exists between the contact of the oil cylinder 501 and the weighing valve 3, and a pressure gauge in a pipeline of the exhaust mechanism 602 displays that the pressure of an output pipeline is zero. The test is carried out according to the technical requirements, the control unit 4 is programmed to send out digital signals with different fixed values, the digital signals are converted into electric signals through the D/A converter 9 and sent to the proportional valve 7, the proportional valve 7 controls the oil pressure of a pipeline of the hydraulic station 502 according to the electric signals, the oil cylinder 501 pushes the contact to move upwards and abut against the ejector rod of the weighing valve 3, the pressure bearing plate 2 above the weighing valve 3 is fixedly arranged on the test stand 1, so that the weighing valve 3 cannot move upwards continuously, the weighing valve 3 generates certain pressure air in the exhaust mechanism 602 connected with the exhaust port of the weighing valve according to the load size, the pressure air is read by the output sensor 602a, the analog signals are converted into digital signals through the A/D converter 10 and transmitted to the control unit 4 and displayed on the touch display screen 12, and the control unit 4 is a Programmable Logic Controller (PLC). The test bed also has a closed-loop feedback function on the size of the load. The contact of the oil cylinder 501 is provided with a weighing sensor 8, when the contact props the weighing valve 3 against to generate a load, the weighing sensor 8 converts the load value into a digital signal through an A/D converter 10 to be sent to the control unit 4, and the digital signal is displayed on the touch display screen 12. The program in the control unit 4 compares the actual measurement load value with the test required load value, if the comparison value is within the error range, the pressure air value at the output end is recorded, if the error of the comparison value exceeds the range, the set value of the proportional valve 7 in the control unit 4 is adjusted according to the comparison value to enable the set value to be in line with the error range, and then the pressure air value fed back by the exhaust mechanism 602 is read.
The present invention should be considered as limited only by the preferred embodiments and not by the specific details, but rather as limited only by the accompanying drawings, and as used herein, is intended to cover all modifications, equivalents and improvements falling within the spirit and scope of the invention.
Claims (4)
1. The utility model provides a weighing valve performance test bench which characterized in that: the device comprises a test bench (1), a bearing plate (2), a weighing valve (3), a control unit (4), a loading mechanism (5) and an air charging/exhausting mechanism (6), wherein the bearing plate (2) is fixedly arranged on the test bench (1), the weighing valve (3) is arranged below the bearing plate (2), the loading mechanism (5) is arranged below the weighing valve (3), the air charging/exhausting mechanism (6) is connected with an interface of the weighing valve (3), and the control unit (4) is respectively and electrically connected with the loading mechanism (5) and the air charging/exhausting mechanism (6);
the loading mechanism (5) is provided with a weighing sensor (8), the weighing sensor (8) is electrically connected with the control unit (4), the loading mechanism (5) comprises an oil cylinder (501) and a hydraulic station (502), the oil cylinder (501) is connected with the hydraulic station (502) through a pipeline, the loading mechanism (5) is provided with a proportional valve (7), the body of the proportional valve (7) is installed on the hydraulic station (502), and the control part of the proportional valve is electrically connected with the control unit (4);
fill/exhaust mechanism (6) including aerifing mechanism (601) and exhaust mechanism (602), the one end of aerifing mechanism (601) is connected with the air inlet of weighing valve (3), and the other end is connected with the air pump, the one end of exhaust mechanism (602) is connected with the gas vent of weighing valve (3), the other end and atmosphere intercommunication, aerify mechanism (601) including relief pressure valve (601 a), aerify solenoid valve (601 b) and input sensor (601 c), relief pressure valve (601 a), aerify solenoid valve (601 b) and input sensor (601 c) loop through the tube coupling, exhaust mechanism (602) include output sensor and exhaust solenoid valve (602 b), output sensor and exhaust solenoid valve (602 b) loop through the tube coupling.
2. The weighing valve performance test stand of claim 1, wherein: the top of the weighing valve (3) is installed in contact with the bearing plate (2), and an installation gap is reserved between the bottom of the weighing valve and a contact of the oil cylinder (501).
3. The weighing valve performance test stand of claim 1, wherein: one part of ports of the control unit (4) are electrically connected with the D/A converter (9) and the A/D converter (10), and the other part of ports are electrically connected with the inflation electromagnetic valve (601 b) and the exhaust electromagnetic valve (602 b).
4. The weighing valve performance test stand of claim 3, wherein: the D/A converter (9) is electrically connected with a control part of the proportional valve (7), the A/D converter (10) is connected with the weighing sensor (8), the input sensor (601 c) and the output sensor, and the inflation electromagnetic valve (601 b) and the exhaust electromagnetic valve (602 b) control the on-off of a pipeline of the inflation/exhaust mechanism (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710499365.7A CN107063677B (en) | 2017-06-27 | 2017-06-27 | Weighing valve performance test bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710499365.7A CN107063677B (en) | 2017-06-27 | 2017-06-27 | Weighing valve performance test bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107063677A CN107063677A (en) | 2017-08-18 |
| CN107063677B true CN107063677B (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710499365.7A Active CN107063677B (en) | 2017-06-27 | 2017-06-27 | Weighing valve performance test bed |
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Citations (3)
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| JP2010070175A (en) * | 2008-09-22 | 2010-04-02 | Nabtesco Corp | Brake control device |
| CN204188247U (en) * | 2014-11-19 | 2015-03-04 | 济南轨道交通装备有限责任公司 | A kind of railway freight-car weighing monitoring structure |
| CN106092561A (en) * | 2016-08-29 | 2016-11-09 | 湖北三江航天红峰控制有限公司 | A kind of multifunctional safety valve calibration equipment |
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| JP3496266B2 (en) * | 1994-03-15 | 2004-02-09 | トヨタ自動車株式会社 | Brake system |
| CA2347772A1 (en) * | 1998-10-23 | 2000-05-04 | Knorr-Bremse Systeme Fur Schienenfahrzeuge Gmbh | Brake system for railway vehicles |
| JP4087082B2 (en) * | 2001-06-11 | 2008-05-14 | 中部電力株式会社 | Test method for electric actuator |
| CN102328646B (en) * | 2011-07-25 | 2016-10-05 | 中车青岛四方车辆研究所有限公司 | Urban tram braking system |
| CN203005412U (en) * | 2013-01-14 | 2013-06-19 | 中国铁道科学研究院机车车辆研究所 | Electronic weighing valve control device for rail transit vehicle |
| DE202016009037U1 (en) * | 2015-07-08 | 2021-08-02 | The Joint-Stock Company Mtz Transmash | Load sensor |
| US9835100B2 (en) * | 2015-11-05 | 2017-12-05 | Ford Global Technologies, Llc | Methods and systems for open loop and closed loop control of an exhaust gas recirculation system |
| CN206056946U (en) * | 2016-09-14 | 2017-03-29 | 李干池 | A kind of test equipment for rail vehicle loaded valve |
| CN106840713B (en) * | 2016-12-14 | 2018-06-05 | 杭州中车车辆有限公司 | Bicycle air damping device test bench and its application method |
| CN206832452U (en) * | 2017-06-27 | 2018-01-02 | 眉山中车制动科技股份有限公司 | A kind of weighing valve performance test stand |
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2017
- 2017-06-27 CN CN201710499365.7A patent/CN107063677B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010070175A (en) * | 2008-09-22 | 2010-04-02 | Nabtesco Corp | Brake control device |
| CN204188247U (en) * | 2014-11-19 | 2015-03-04 | 济南轨道交通装备有限责任公司 | A kind of railway freight-car weighing monitoring structure |
| CN106092561A (en) * | 2016-08-29 | 2016-11-09 | 湖北三江航天红峰控制有限公司 | A kind of multifunctional safety valve calibration equipment |
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| CN107063677A (en) | 2017-08-18 |
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