CN101982755B - Rotary bending fatigue tester of aviation conduit assembly - Google Patents

Abstract

The rotating bending fatigue testing machine for aviation conduit components is designed to solve technical problems such as low test accuracy and low test efficiency of existing equipment. It includes a synchronous belt transmission mechanism, a main shaft mechanism, a main support vertical plate, a deflection adjustment mechanism, a tailstock shaft/pipe installation and fixing mechanism, a working table and a counting mechanism. The testing machine adopts a synchronous belt transmission mechanism to distribute power; the main support vertical plate and the tailstock shaft/tube installation and fixing mechanism ensure the coaxial accuracy of assembly and positioning through the U-shaped slot opened on the worktable; the deflection adjustment mechanism The bearing oblique hole installation method is adopted; the tailstock shaft/pipe installation and fixing mechanism adopts a detachable and replaceable design. Beneficial effects: the structure of the transmission mechanism is compact, and the installation method of the inclined hole of the bearing in the deflection adjustment mechanism effectively increases the available swing angle of the self-aligning bearing; the movable and detachable design of the tailstock shaft/pipe installation and fixing mechanism improves the equipment scope and versatility. Tests of different strengths of different pipes/shafts can be carried out on one device at the same time, improving test efficiency, reducing costs and production preparation cycles.

Description

Rotary Bending Fatigue Testing Machine for Aeronautical Conduit Components

Technical field:

The invention relates to a testing device, in particular to a rotating bending fatigue testing machine for an aviation catheter assembly. It belongs to the field of experimental testing equipment.

Background technique:

Bending fatigue is the most common form of fatigue failure in most mechanical systems. Therefore, it is necessary to study the bending fatigue characteristics of parts and materials to improve the reliability of the design. The use of rotating bending fatigue testing machine to measure the fatigue life of materials under a certain stress state and draw the S-N curve of material fatigue is the most important tool and means to study the fatigue fracture of materials. At present, domestic rotary bending fatigue testing machines generally have the disadvantages of complex equipment structure, low test accuracy and efficiency, while similar foreign products are relatively expensive and inconvenient to maintain. At the same time, there are currently no aviation catheter components with internal pressure at home and abroad Designed testing machine products. It is a difficult problem to design a rotary bending fatigue testing machine that can meet the precision requirements while having high work efficiency and can test the aviation conduit components with internal pressure.

Invention content:

In order to solve the technical problems of complex equipment structure, low test accuracy and efficiency, and the relatively expensive price of foreign similar products and inconvenient maintenance, the present invention provides a rotary bending fatigue testing machine for aviation catheter components. It is composed of synchronous belt transmission mechanism, main shaft mechanism, main support vertical plate, deflection adjustment mechanism, tailstock shaft/tube installation and fixing mechanism, worktable and counting mechanism. There are strip-shaped U-shaped grooves parallel to each other and running through the entire worktable on the worktable; the sample support is composed of the main support vertical plate equipped with a deflection adjustment mechanism and the tailstock shaft/tube installation and fixing mechanism mechanism, the sample support mechanism is mirror-symmetrically arranged on both sides of the synchronous belt transmission mechanism, and coaxial positioning is realized by assembling the U-shaped boss at the bottom of the sample support mechanism with the strip-shaped U-shaped groove on the worktable; The power output shaft of the motor is driven and connected with the synchronous belt transmission mechanism, and then the driven shaft of the main shaft mechanism is distributed through the synchronous belt transmission mechanism; the deflection adjustment mechanism adopts the installation mode of the bearing oblique hole.

Features and beneficial effects of the present invention: the structure of the transmission mechanism is compact, and the installation method of the inclined hole of the bearing in the deflection adjustment mechanism effectively increases the available swing angle of the self-aligning bearing; The disassembly design improves the application range and versatility of the equipment. Tests of different strengths of different tubes/shafts can be carried out on one device at the same time, improving test efficiency, reducing cost and production preparation cycle.

Specifically in:

The synchronous belt transmission mechanism design can carry out the rotating bending fatigue test on six shafts/pipes at the same time, which greatly improves the test efficiency;

The tailstock shaft/tube installation and fixing mechanism adopts a replaceable design, which can not only adapt to ordinary shaft parts, but also conduct tests on hydraulic conduits with internal pressure, expanding the scope of use; at the same time, the tailstock shaft/tube installation and fixing mechanism is an easy The loss part, due to the replaceable design, effectively solves the embarrassing situation that the vulnerable part of the fatigue testing machine "fatigues" before the test piece, reduces the test cost, and improves the overall life of the testing machine.

The unique installation design of the inclined hole bearing on the deflection adjustment mechanism effectively solves the limitation of the common installation method because the inner ring of the general self-aligning bearing is within the range of 1 degree to 2.5 degrees relative to the outer ring. , so that the available swing angle is doubled, effectively improving the deflection adjustment range of the shaft/pipe end, thereby increasing the stress adjustment range of the test part, and increasing the applicable range of the testing machine;

Through the U-shaped groove structure on the worktable and the boss under the sample support mechanism for sliding and positioning, it can not only adapt to the test of standard length test pieces, but also adapt to the test of non-standard situations;

Description of drawings:

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of a synchronous belt transmission mechanism.

Fig. 3 is a structural schematic diagram of the deflection adjustment mechanism.

Figure 4 is a schematic diagram of the installation of the inclined hole of the bearing of the deflection adjustment mechanism.

Fig. 5 is a structural schematic diagram of the tailstock shaft/pipe mounting and fixing mechanism.

Fig. 6 is a structural schematic diagram of the counting mechanism.

Detailed ways:

Referring to Figures 1 to 6, the rotary bending fatigue testing machine for aviation conduit components consists of a synchronous belt transmission mechanism 1, a main shaft mechanism 2, a main support vertical plate 3, a deflection adjustment mechanism 4, and a tailstock shaft/tube installation and fixing mechanism 5. Platen 6 and counting mechanism 7 are formed. There are strip-shaped U-shaped grooves parallel to each other and running through the entire worktable on the worktable 6; the main support vertical plate 3 equipped with a deflection adjustment mechanism 4 and the tailstock shaft/pipe are installed with a fixed mechanism 5 The sample support mechanism is formed, and the sample support mechanism is mirror-symmetrically arranged on both sides of the synchronous belt transmission mechanism 1, and passes through the U-shaped boss at the bottom of the sample support mechanism and the strip-shaped U-shaped groove on the worktable 6 Assembling to achieve coaxial positioning; and through the drive connection of the motor power output shaft and the synchronous belt transmission mechanism 1, and then through the synchronous belt transmission mechanism 1 to the driven shaft of the main shaft mechanism 2 for power distribution; the deflection adjustment mechanism 4 uses Bearing oblique hole installation.

Described deflection adjustment mechanism 4 is mainly made of deflection adjustment screw 41, counterweight adjustment block combination 42, offset disc 43, self-aligning ball bearing 44, blockage 45 and offset control disc 46; There are grooves and bosses at the corresponding positions between the discs 43, which are connected by sliding fit between the grooves and the bosses and positioned by bolts; in the offset disc 43, there is a circle with a small slope relative to the normal plane of its moving direction. Holes 47, in which self-aligning ball bearings 44 are installed; deflection adjustment screws 41 are radially placed on both sides of the offset disc 43, and a counterweight adjustment block assembly 42 is provided on one side of the offset disc 43.

The tailstock shaft/pipe installation and fixing mechanism 5 is designed as a detachable replacement interface.

The detachable replacement interface of the tailstock shaft/pipe installation and fixing mechanism 5 is connected with a threaded connection with a copper washer seal.

The detachable replacement interface of the tailstock shaft/pipe installation and fixing mechanism 5 is connected with a clamping structural connector.

The tailstock shaft/pipe installation and fixing mechanism 5 is fixed on the worktable by a triangular support member.

The counting mechanism 7 decelerates the motor speed and transmits it to the mechanical counter through two synchronous belt deceleration devices, so as to realize the revolution counting.

The synchronous belt transmission mechanism 1 realizes transmission connection between one driving wheel and at least one driven wheel at the same time through the synchronous belt; it is best set as three driven wheels, and the size of each synchronous belt wheel is the same.

Both ends of the main shaft mechanism 2 are supported by double-row deep groove ball bearings.

The working platform 6 has a dodging groove at the position corresponding to the bottom of the main support vertical plate 3, the deflection adjustment mechanism 4 and the tailstock shaft/pipe installation and fixing mechanism 5.

Example

There is a U-shaped groove running through the entire workbench on the workbench 6 of the aviation duct assembly rotary bending fatigue testing machine, and the riser in the main support vertical plate 3 and the tailstock shaft/tube installation and fixing mechanism 5 There is a U-shaped boss at the corresponding position on the bottom, which can play two roles. One is to effectively ensure the coaxiality of the corresponding shaft holes when the two main support vertical plates are installed, so as to ensure the centering of the main shaft installation. At the same time, it can also ensure the centering of the tube/shaft in the initial state of the later test; the second is that the distance between the main support vertical plate 3 and the tailstock shaft/tube installation and fixing mechanism 5 can be easily realized during the test, effectively adapting to different Length tube/shaft correlation experiments, increasing the versatility of the equipment.

Referring to Figure 2, the synchronous belt transmission mechanism 1 of the testing machine adopts the synchronous belt transmission mode. In a limited space, the power distribution from one to three and three to six is realized at a relatively small cost, so that the test machine can simultaneously control two groups. The length (six pieces in total) of tubes/shafts are tested with different deflection values, which greatly improves the test efficiency of the testing machine.

Referring to FIG. 3 , the deflection adjustment mechanism 4 is mainly composed of a deflection adjustment screw 41 , a counterweight adjustment block assembly 42 , an offset plate 43 , self-aligning ball bearings 44 , a plug 45 , and an offset control plate 46 . During the test, adjusting the length of the deflection adjusting screw 41 can easily change the deflection value of the shaft/pipe to meet the test requirements. At the same time, adjusting the counterweight adjusting block combination 42 can minimize the vibration caused by the eccentric rotation of the entire mechanism. There are grooves and bosses at the corresponding positions of the offset control plate 46 and the offset plate 43, and the two are connected by sliding fit, which can ensure that the offset plate moves strictly along the center line during the deflection adjustment process, ensuring the deflection Circumferential stability of the value. There is a circular hole 47 with a small inclination relative to the normal plane of the moving direction in the offset disk 43, and the self-aligning ball bearing 4 is installed in it. Get smaller, and then go from small to bigger. This increases the available swing angle of the bearing without changing the selected bearing, thereby increasing the deflection adjustment range.

Referring to Figures 1 and 5, the tailstock shaft/pipe installation and fixing mechanism 5 is designed to be detachable and replaceable. For hydraulic pipes with internal pressure, a threaded connection with copper gasket seal is adopted, so that the connection reliability can be ensured. Effectively achieves a tip seal. For other types of pipe/shaft parts, the clamping structure can be designed on the basis of the existing interface form of the tailstock to meet the needs. At the same time, a triangular support member is designed on the tailstock, which is fixed on the worktable after being connected with the tailstock to reduce the vibration caused by the unreliable connection of the tailstock during the test.

Referring to FIG. 6 , the counting mechanism 7 transmits the deceleration of the motor speed to the mechanical counter through two simple synchronous belt deceleration devices, so as to realize the visibility of the number of revolutions.

During the test, refer to Figure 1, first install and fix the tube/shaft on the tailstock shaft/tube installation and fixing mechanism 5, and adjust its position on the worktable 6, and adjust the tube/shaft test station through the deflection adjustment mechanism 4 If deflection is required, the main shaft mechanism 2 of the main support vertical plate 3 is driven by the motor and the synchronous belt transmission mechanism 1. At this time, the tube/shaft is rotated and bent under a certain bending moment, and the counting mechanism 7 starts counting at the same time.

For the hydraulic pipe with internal pressure, first connect the hydraulic pipe to the tailstock shaft/pipe installation and fixing mechanism 5, move the tailstock, and insert the end of the hydraulic pipe into the self-aligning ball bearing 44 of the deflection adjustment mechanism 4. Paste the resistance strain gauge on the assessment site, adjust the deflection adjustment screw 41 in the deflection adjustment mechanism 4, observe the change of the strain value in the strain gauge, tighten the fixing screw of the offset plate 43 after adjustment, and adjust the counterweight adjustment block combination 42 The height to reduce the eccentricity of the whole mechanism. Turn on the motor control switch to test.

Claims (10)

1. aviation conduit tube component rotary bending tester; It is by synchronous belt drive mechanism (1), mainshaft mechanism (2), main supporting vertical plate (3); Amount of deflection governor motion (4); Tail spindle/pipe mechanism for installing (5), working plate (6) and counting mechanism (7) are formed, and it is characterized in that: on said working plate (6), have and be parallel to each other and through the strip U type groove of whole working plate; Form sample supporting mechanism by the main supporting vertical plate (3) that amount of deflection governor motion (4) is housed and tail spindle/pipe mechanism for installing (5); Said sample supporting mechanism mirror image is symmetricly set on the both sides of synchronous belt drive mechanism (1), and U type boss and the assembling of the strip U type groove on the working plate (6) realization coaxial positioning through sample supporting mechanism bottom; And be connected through the driving of motor power output shaft and synchronous belt drive mechanism (1), through synchronous belt drive mechanism (1) driven shaft of mainshaft mechanism (2) is carried out power distribution again; In said amount of deflection governor motion (4), adopted bearing inclined hole mounting means.

2. aviation conduit tube component rotary bending tester according to claim 1 is characterized in that: said amount of deflection governor motion (4) mainly is made up of amount of deflection set screw (41), the combination of counterweight regulating block (42), skew dish (43), self-aligning ball bearing (44), obstruction (45) and skew console panel (46); Opposite position has groove and boss between skew console panel (46) and skew dish (43), and is connected with the boss sliding matching mode and passes through bolt and locate through groove; In skew dish (43), have the gradient circular hole of its moving direction normal plane relatively, self-aligning ball bearing (44) is installed wherein; Amount of deflection set screw (41) radially places skew dish (43) both sides, and is provided with counterweight regulating block combination (42) in a side of skew dish (43).

3. aviation conduit tube component rotary bending tester according to claim 1 is characterized in that: said tail spindle/pipe mechanism for installing (5) is designed to detachably replace interface.

4. aviation conduit tube component rotary bending tester according to claim 3 is characterized in that: the threaded connector of connecting band copper washer sealing on the said detachable replacement interface of tail spindle/pipe mechanism for installing (5).

5. aviation conduit tube component rotary bending tester according to claim 3 is characterized in that: connect the structural connection that is installed on the said detachable replacement interface of tail spindle/pipe mechanism for installing (5).

6. according to claim 4 or 5 described aviation conduit tube component rotary bending testers, it is characterized in that: said tail spindle/pipe mechanism for installing (5) is fixed on the working plate through the gusseted member.

7. aviation conduit tube component rotary bending tester according to claim 1 is characterized in that: said counting mechanism (7) is with reduction gear that motor speed is slowed down synchronously through two and is passed to mechanical counter, realize revolution counter.

8. aviation conduit tube component rotary bending tester according to claim 1; It is characterized in that: said synchronous belt drive mechanism (1); Realize being in transmission connection with at least one engaged wheel simultaneously by a driving wheel through synchronous band, the size of each synchronous pulley is consistent.

9. aviation conduit tube component rotary bending tester according to claim 1 is characterized in that: the two ends of said mainshaft mechanism (2) are provided with double deep groove ball bearing supporting.

10. aviation conduit tube component rotary bending tester according to claim 1 is characterized in that: working plate (6) is having and is hiding groove with said main supporting vertical plate (3), amount of deflection governor motion (4) and tail spindle/pipe mechanism for installing (5) bottom correspondence position.

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