CN112014087A - Rubber node three-dimensional fatigue test device based on pull rod - Google Patents

Rubber node three-dimensional fatigue test device based on pull rod Download PDF

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Publication number
CN112014087A
CN112014087A CN202010871258.4A CN202010871258A CN112014087A CN 112014087 A CN112014087 A CN 112014087A CN 202010871258 A CN202010871258 A CN 202010871258A CN 112014087 A CN112014087 A CN 112014087A
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pull rod
angle adjusting
loading
plate
rod
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CN112014087B (en
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王金辉
刘晓倩
唐维
张运珍
陶瑶
王叶青
冯万盛
林达文
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Zhuzhou Times New Material Technology Co Ltd
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Zhuzhou Times New Material Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/08Railway vehicles

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  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a rubber node three-way fatigue test device based on a pull rod, which comprises a vertical loading device, an angle adjusting device, a transverse loading device, a longitudinal offset device and a pull rod device, wherein the pull rod device comprises an upper connecting device, a lower connecting device and a pull rod, two ends of the pull rod are provided with spherical hinges, the upper side of the upper connecting device and the lower side of the lower connecting device are both provided with the angle adjusting device, the lower connecting device is connected with the lower end of the pull rod, the upper connecting device is connected with the upper end of the pull rod, the loading end of the transverse loading device and the adjusting end of the longitudinal offset device are connected with the angle adjusting device on the lower side, and the loading end of the vertical loading device is connected with the angle adjusting device on. By adopting the pull rod scheme, the invention can simultaneously realize radial, deflection and torsion three-way fatigue tests of the rubber ball hinge, can simultaneously perform 2 ball hinge tests, improves the test efficiency and the reliability, and avoids the test discreteness and errors caused by individual differences of the ball hinge.

Description

Rubber node three-dimensional fatigue test device based on pull rod
Technical Field
The invention relates to the technical field of rail vehicle product tests, in particular to a rubber node three-way fatigue test device based on a pull rod.
Background
The rubber nodes are formed by vulcanizing a metal outer sleeve, a metal core shaft and rubber, and some rubber nodes also comprise spacer bushes. The rubber material used in the method has the characteristics of reducing vibration and noise, long service life and the like. The rubber node is a common vibration-damping and noise-reducing element, is used as a movable joint capable of transmitting multidirectional loads such as radial load, axial load, deflection load, torsion load and the like, and is widely applied to the fields of machinery, locomotives, automobiles and the like. The main function is to realize vibration damping, buffering and elastic connection. In order to bear the transient impact and the fatigue action of the multidirectional load, the rubber node not only needs to meet the all-directional rigidity characteristic, but also needs to have certain fatigue resistance.
In the actual loading operation process, the rubber node can bear unidirectional or multidirectional combined loads in radial direction, axial direction, deflection and torsion at the same time. In particular, three types of products, namely a first-series axle box pull rod spherical hinge, a positioning rotating arm node and a second-series traction pull rod spherical hinge, have higher frequencies of radial action, deflection action and torsion action simultaneously due to the installation form and the bearing characteristics, and are very critical. In order to truly and accurately simulate the fatigue resistance of the rubber nodes, higher requirements are put on a fatigue testing device.
The patent 200610032543.7 discloses a method and a device for three-way loading fatigue test of a rubber ball hinge, which comprises a radial, deflection and torsion three-way loading fatigue test device, and a three-way loading comprehensive fatigue test is carried out on the test rubber ball hinge in a mode of applying mechanical force to the test rubber ball hinge. The device needs three independent oil cylinders, wherein the radial force application device and the torsion force application device are respectively connected with an independent vertical oil cylinder, the deflection force application device is connected with an independent transverse oil cylinder, and the loading synchronism among the force application devices is poor.
The patent 201120268837.6 discloses a rubber ball hinge loading fatigue test device, which comprises a radial force application device, a deflection force application device and a torsion force application device. Wherein radial force application device and deflection force application device include a vertical hydro-cylinder respectively, twist reverse force application device and include a horizontal hydro-cylinder, and this utility model discloses a test device equally needs three hydro-cylinder, makes whole test device structure compact inadequately.
The ball-and-socket three-way loading fatigue test device disclosed in patent 201610131919.3 and the rubber node three-way fatigue test device disclosed in patent 202010005226.6 both comprise a radial force application device, a deflection force application device and a torsion force application device. The radial force application device comprises a vertical oil cylinder, and the deflection force application device and the torsion force application device share the vertical oil cylinder. The torsion force application devices in the two test devices comprise two universal couplings, the universal couplings are easy to wear to cause that the torsion fatigue angle error of the spherical hinge is increased along with the increase of the service time, and the replacement frequency is high. And along with the increase of the external diameter of the spherical hinge, the whole size and the weight of the device are obviously increased, and the device is not suitable for the three-way loading fatigue test of the spherical hinge with the large external diameter size.
In addition, the testing devices described in the above patents all perform three-way loading fatigue tests on independent spherical hinges, and during actual loading operation, the first-system axle box drawbar spherical hinge, the positioning rotating arm node and the second-system drawbar spherical hinge are all assembled in the rod body or the rotating arm, and are converted into deflection and torsion motions of the spherical hinge through the displacement motion of the rod body or the rotating arm, that is, the above testing devices cannot completely simulate the actual loading of the spherical hinge.
Disclosure of Invention
The invention aims to provide a rubber node three-way fatigue test device based on a pull rod, so that the problems are solved.
In order to achieve the purpose, the invention discloses a rubber node three-way fatigue test device based on a pull rod, which comprises a vertical loading device, an angle adjusting device, a transverse loading device, a longitudinal biasing device and a pull rod device, wherein the pull rod device comprises an upper connecting device, a lower connecting device and a pull rod, two ends of the pull rod are provided with spherical hinges, the angle adjusting device is arranged on the upper side of the upper connecting device and the lower side of the lower connecting device, the lower connecting device is connected with the lower end of the pull rod, the upper connecting device is connected with the upper end of the pull rod, the loading end of the transverse loading device and the adjusting end of the longitudinal biasing device are connected with the angle adjusting device on the lower side, and the loading end of the vertical loading device is connected with the angle adjusting device on the upper side.
Further, angle adjusting device include first angle regulating plate and with position adjustable mode install in second angle regulating plate on the first angle regulating plate, be provided with T type groove on first angle regulating plate and the second angle regulating plate, it installs through T type bolt to go up connecting device and lower connecting device on the second angle regulating plate, the circumference of second angle regulating plate be provided with be used for with the rectangular hole that first angle regulating plate is connected.
Furthermore, a clamping groove and a clamping block which is detachably clamped into the clamping groove are formed in the second angle adjusting plate, and the strip hole is formed in the clamping block.
Furthermore, the upper connecting device and the lower connecting device comprise spherical hinge supporting blocks arranged on two sides of the pull rod, and spherical hinge supporting block holes used for being installed in the T-shaped grooves and spherical hinge installation holes used for installing two ends of the spherical hinges are formed in the spherical hinge supporting blocks.
Furthermore, the pull rod comprises a middle connecting rod and pressing blocks detachably mounted at two ends of the connecting rod, and a spherical hinge mounting cavity for mounting a spherical hinge is formed between the connecting rod and the pressing blocks.
Furthermore, the transverse loading device comprises a transverse loading oil cylinder, a sliding plate and a sliding plate seat, the angle adjusting device on the lower side is installed on the sliding plate, the sliding plate is transversely connected with the sliding plate seat in a sliding mode, and the loading end of the transverse loading oil cylinder is connected with the sliding plate.
The sliding plate is characterized by further comprising a base, a sliding groove is formed in the base, a sliding rod which is longitudinally connected with the sliding groove in a sliding mode is arranged below the sliding plate seat, and the sliding plate seat is driven by a jack.
Furthermore, a rolling assembly is arranged on the base, the rolling assembly is arranged in a sliding cavity of the sliding plate seat, and the lower end of the sliding plate is abutted against the rolling assembly.
Further, still include collateral branch fagging, an upper fixed plate and an upper mounting panel, the collateral branch fagging is installed just be located on the base the both sides of pull rod are installed the guide rail on this collateral branch fagging, the both sides of going up the mounting panel be provided with the slider of guide rail sliding connection, vertical loading device's loading end with the upside of going up the mounting panel is connected, the upside angle adjusting device is installed the downside of going up the mounting panel.
Furthermore, an angle detection device is installed on the pull rod and consists of a double-shaft tilt angle sensor.
Compared with the prior art, the invention has the advantages that:
the invention starts from the angle of simulating the actual loading use of the spherical hinge, adopts a pull rod scheme, and can simultaneously realize the radial, deflection and torsion three-way fatigue test. The pull rod spherical hinge is installed in the composite loading test device, the upper spherical hinge mandrel and the lower spherical hinge mandrel are loaded based on the pull rod device, the vertical oil cylinder realizes radial loading, and the horizontal oil cylinder realizes deflection and torsion loading simultaneously in a combined displacement mode. The aim of improving the overall lateral force resistance of the test and reducing the friction force of the guide pillar is fulfilled vertically through a lower two-way guide rail and upper and lower two-way guide test technology. The transverse offset displacement is applied and the transverse load generated by offset is eliminated by rolling friction. The bias device longitudinally passes through the device and consists of a jack, a positioning bolt and a sliding table side plate, and the function of the bias device is to apply longitudinal shearing displacement to the pull rod spherical hinge so as to realize the pre-static loading of deflection or torsion angles. Further, adopt the pull rod scheme, can realize the radial, deflect and twist reverse three-dimensional fatigue test of rubber ball pivot simultaneously, can do 2 ball pivot's experiments simultaneously, improve test efficiency and credibility, avoid because of the experimental discreteness and the error that the individual difference of ball pivot caused.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic deflection diagram of a three-way fatigue testing device for a tie-rod based rubber node according to a preferred embodiment of the present invention;
FIG. 2 is a schematic torsion diagram of a tension rod-based rubber node three-way fatigue testing device according to a preferred embodiment of the present invention;
FIG. 3 is a first axial schematic view of a tie rod based rubber node three-way fatigue testing apparatus according to a preferred embodiment of the present invention;
FIG. 4 is a second axial view of a tie rod based three-way fatigue testing apparatus for a rubber node according to the preferred embodiment of the present invention;
FIG. 5 is a schematic front view of a three-way fatigue testing device for a tie-rod based rubber node according to a preferred embodiment of the present invention;
FIG. 6 is an enlarged schematic view at A of FIG. 5;
FIG. 7 is a schematic top view of a tension rod-based rubber node three-way fatigue testing apparatus according to a preferred embodiment of the present invention;
fig. 8 is a schematic side view of a tie-rod-based rubber node three-way fatigue testing device according to a preferred embodiment of the invention.
Illustration of the drawings:
1. a vertical loading device; 11. a vertical cylinder;
2. an angle adjusting device; 21. a first angle adjusting plate; 22. a second angle adjusting plate; 23. a T-shaped groove; 24. a T-bolt; 25. a strip hole; 26. a card slot; 27. a clamping block;
3. a transverse loading device; 31. transversely loading the oil cylinder; 32. a slide plate; 33. a slide plate seat; 34. a slide bar; 35. a slide chamber;
4. a longitudinal biasing device; 41. a jack;
5. a pull rod device; 51. an upper connecting device; 52. a lower connecting device; 53. a pull rod; 54. a spherical hinge support block; 55. a connecting rod; 56. briquetting; 57. a spherical hinge mounting cavity;
6. spherical hinge; 61. a mandrel;
7. a base; 71. a chute; 72. a rolling component; 73. side supporting plates; 74. an upper fixing plate; 75. an upper mounting plate; 76. a guide rail; 77. a slider; 78. a support roller;
8. an angle detection device.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 to 8, the embodiment of the invention discloses a rubber node three-way fatigue test device based on a pull rod, which comprises a vertical loading device 1, an angle adjusting device 2, a transverse loading device 3, a longitudinal biasing device 4 and a pull rod device 5, wherein a vertical oil cylinder 11 of the vertical loading device 1 applies force to the pull rod device 5 in the vertical direction, the angle adjusting device 2 is used for adjusting a deflection angle alpha and a torsion angle beta of the pull rod device 5, and the transverse loading device 3 and the longitudinal biasing device 4 apply force to the pull rod device 5 in the transverse direction and the longitudinal direction. The pull rod device 5 comprises an upper connecting device 51, a lower connecting device 52 and a pull rod 53, wherein the two ends of the pull rod 53 are provided with spherical hinges 6, the upper side of the upper connecting device 51 and the lower side of the lower connecting device 52 are both provided with angle adjusting devices 2, the lower connecting device 52 is connected with the lower end of the pull rod 53, the upper connecting device 51 is connected with the upper end of the pull rod 53, so that the two ends of the pull rod device 5 are arranged on the angle adjusting devices 2, the loading end of a transverse loading device 3 and the adjusting end of a longitudinal biasing device 4 are connected with the angle adjusting devices 2 on the lower side, the loading end of a vertical loading device 1 is connected with the angle adjusting devices 2 on the upper side, so that the working condition of the spherical hinges 6 used in actual loading can be completely simulated, the pull rod scheme is adopted, the two spherical hinges 6 are arranged at the two ends of the pull rod 53, and the mandrel 61 of the two spherical, simultaneously, 2 ball joints are tested, the test efficiency and the reliability are improved, the test discreteness and errors caused by individual differences of the ball joints 6 are avoided, meanwhile, the pull rod 53 is provided with the angle detection device 8, and the angle detection device 8 is composed of a double-shaft inclination angle sensor, so that the current inclination angle posture can be measured and output in real time, and the angle data can be displayed in real time in an interface mode by combining with a software program, and the visualization is realized.
In this embodiment, the angle adjusting device 2 includes a first angle adjusting plate 21 and a second angle adjusting plate 22 installed on the first angle adjusting plate 21 in a position-adjustable manner, i.e. the second angle adjusting plate 22 can be fixed on the first angle adjusting plate 21, and can horizontally move relative to the first angle adjusting plate 21, so as to adjust the deflection angle α and the torsion angle β of the adjusting lever device 5. Specifically, T-shaped grooves 23 (other special-shaped grooves may be formed in the first angle adjusting plate 21 and the second angle adjusting plate 22), the T-shaped grooves 23 of the first angle adjusting plate 21 are arranged in a 'cross' shape, the upper connecting device 51 and the lower connecting device 52 are mounted on the second angle adjusting plate 22 through T-shaped bolts 24, the second angle adjusting plate 22 is circumferentially provided with strip holes 25 used for being connected with the first angle adjusting plate 21, the strip holes 25 are waist-shaped holes, the whole first angle adjusting plate is arranged in a 'cross' shape, the T-shaped grooves 23 of the first angle adjusting plate 21 are arranged in a 'cross' shape, the whole second angle adjusting plate 22 is arranged in a 'cross' shape, the strip holes 25 are integrally arranged in a 'cross' shape, the second angle adjusting plate 22 can be fixed after rotating for any angle and translating on the first angle adjusting plate 21, and the range of rotation angle adjustment is expanded. The adjustment of the angle of deflection α and the angle of rotation β of the lever ball pivot is effected by a pre-rotation angle adjustment device, wherein the pre-rotation angle of the angle adjustment device 2 is ATAN (α/β) × 180/3.14.
In this embodiment, in order to improve the manufacturability of the second angle adjusting plate 22 and reduce the manufacturing difficulty and cost, the second angle adjusting plate 22 is provided with a clamping groove 26 and a clamping block 27 (one end of the clamping block 27 is provided with a protrusion matching with the clamping groove 26) detachably clamped in the clamping groove 26, and the elongated hole 25 is arranged in the clamping block 27.
In this embodiment, the upper connecting device 51 and the lower connecting device 52 include spherical hinge support blocks 54 disposed at two sides of the pull rod 53, the spherical hinge support blocks 54 are provided with spherical hinge support block holes for being mounted in the T-shaped groove 23 and spherical hinge mounting holes for mounting two ends of the spherical hinge 6, two ends of an upper core shaft 61 of the spherical hinge 6 are mounted on the spherical hinge support blocks 54 through bolts, that is, the core shaft 61 spans over the two spherical hinge support blocks 54, wherein a sufficient space needs to be reserved between the two spherical hinge support blocks 54, so as to facilitate the rotation of the spherical hinge 6 and simulate actual working conditions.
In this embodiment, the tie rod 53 includes a middle connecting rod 55 and pressing blocks 56 detachably mounted at both ends of the connecting rod 55, the ends of the connecting rod 55 and the pressing blocks 56 form a structure similar to a bearing seat, and specifically, a ball hinge mounting cavity 57 for mounting the ball hinge 6 is formed between the connecting rod 55 and the pressing blocks 56, so as to enclose the middle part of the ball hinge 6.
In this embodiment, the transverse loading device 3 includes a transverse loading cylinder 31, a sliding plate 32 and a sliding plate seat 33, the lower angle adjusting device 2 is installed on the sliding plate 32, the sliding plate 32 is in transverse sliding contact with the sliding plate seat 33, so as to achieve an accurate guiding effect on the sliding plate 32, and a loading end (i.e., a piston rod) of the transverse loading cylinder 31 is connected with the sliding plate 32.
In this embodiment, the device further comprises a base 7, the base 7 is provided with a lifting lug and a U-shaped groove, the lifting lug and the U-shaped groove are convenient to hoist and mount and fix on a workbench, the base 7 is provided with a sliding groove 71, a sliding rod 34 longitudinally connected with the sliding groove 71 in a sliding manner is arranged below the sliding plate seat 33, the sliding rod 34 is arranged at the bottom of the sliding plate seat 33 and inserted into the sliding groove 71, the sliding plate seat 33 is driven by a jack 41, specifically, the driving end of the jack 41 is connected to the sliding plate seat 33 through a positioning bolt, so that longitudinal shearing displacement is applied to a pull rod ball hinge, and pre-static loading of deflection or torsion angles is realized. Further, in consideration of the experiment, considering that the vertical load applied by the vertical loading device 1 can significantly increase the resistance (mainly the friction force at the bottom of the movable sliding plate 32) when the sliding plate 32 is driven by the transverse loading cylinder 31, the base 7 is provided with the rolling assembly 72, the rolling assembly 72 is arranged in the sliding cavity 35 of the sliding plate seat 33, the lower end of the sliding plate 32 is abutted to the rolling assembly 72, and the rolling assembly 72 is specificallyThe support plate of the support roller 78 is surface-fixedly mounted so that the slide plate 32 and the support roller 78 roll with each other, reducing friction. In the application of transverse dynamic displacement, in particular loading displacement, to the ball joint 6
Figure BDA0002651192640000051
Where L is the center-to-center distance between the two holes of the connecting rod 55. The device has the advantages of simple connection form, easy control of displacement load transmission and higher test precision.
In this embodiment, in order to realize accurate vertical guiding, the device further comprises a side supporting plate 73, an upper fixing plate 74 and an upper mounting plate 75, wherein the side supporting plate 73 is installed on the base 7 and located at two sides of the pull rod 53, a guide rail 76 is installed on the side supporting plate 73, two sides of the upper mounting plate 75 are provided with a sliding block 77 in sliding contact with the guide rail 76, and a loading end of the vertical loading device 1 is connected with the upper mounting plate 75.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a rubber node three-dimensional fatigue test device based on pull rod, its characterized in that includes vertical loading device (1), angle adjusting device (2), horizontal loading device (3), vertical biasing device (4) and pull rod device (5), pull rod device (5) include connecting device (51), lower connecting device (52) and both ends install the pull rod (53) of ball pivot (6), the upside of going up connecting device (51) and the downside of lower connecting device (52) all install angle adjusting device (2), lower connecting device (52) with the lower extreme of pull rod (53) is connected, go up connecting device (51) with the upper end of pull rod (53) is connected, the loading end of horizontal loading device (3), the regulation end of vertical biasing device (4) and downside angle adjusting device (2) are connected, the loading end of the vertical loading device (1) is connected with the angle adjusting device (2) on the upper side.
2. The tie-rod-based rubber node three-way fatigue testing device according to claim 1, wherein the angle adjusting device (2) comprises a first angle adjusting plate (21) and a second angle adjusting plate (22) installed on the first angle adjusting plate (21) in a position-adjustable manner, T-shaped grooves (23) are formed in the first angle adjusting plate (21) and the second angle adjusting plate (22), the upper connecting device (51) and the lower connecting device (52) are installed on the second angle adjusting plate (22) through T-shaped bolts (24), and long strip holes (25) for connecting with the first angle adjusting plate (21) are formed in the circumferential direction of the second angle adjusting plate (22).
3. The pull rod-based rubber node three-way fatigue testing device is characterized in that a clamping groove (26) and a clamping block (27) which is detachably clamped into the clamping groove (26) are arranged on the second angle adjusting plate (22), and the strip-shaped hole (25) is formed in the clamping block (27).
4. The pull rod-based rubber node three-way fatigue testing device is characterized in that the upper connecting device (51) and the lower connecting device (52) comprise ball hinge supporting blocks (54) arranged on two sides of the pull rod (53), and ball hinge supporting block holes used for being installed in the T-shaped groove (23) and ball hinge installation holes used for installing two ends of a ball hinge (6) are formed in the ball hinge supporting blocks (54).
5. The pull rod-based rubber node three-way fatigue testing device is characterized in that the pull rod (53) comprises a middle connecting rod (55) and pressing blocks (56) detachably mounted at two ends of the connecting rod (55), and a ball hinge mounting cavity (57) for mounting a ball hinge (6) is formed between the connecting rod (55) and the pressing blocks (56).
6. The tie-rod based rubber node three-way fatigue testing device according to any one of claims 1 to 5, wherein the lateral loading device (3) comprises a lateral loading cylinder (31), a sliding plate (32) and a sliding plate seat (33), the lower angle adjusting device (2) is mounted on the sliding plate (32), the sliding plate (32) is in lateral sliding connection with the sliding plate seat (33), and a loading end of the lateral loading cylinder (31) is connected with the sliding plate (32).
7. The pull rod-based rubber node three-way fatigue testing device is characterized by further comprising a base (7), wherein a sliding groove (71) is formed in the base (7), a sliding rod (34) which is in longitudinal sliding contact with the sliding groove (71) is arranged below the sliding plate seat (33), and the sliding plate seat (33) is driven by a jack (41).
8. The tie-rod based rubber node three-way fatigue testing device according to claim 7, wherein a rolling assembly (72) is arranged on the base (7), the rolling assembly (72) is arranged in a sliding cavity (35) of the sliding plate seat (33), and the lower end of the sliding plate (32) abuts against the rolling assembly (72).
9. The pull rod-based rubber node three-way fatigue testing device is characterized by further comprising side supporting plates (73), an upper fixing plate (74) and an upper mounting plate (75), wherein the side supporting plates (73) are installed on the base (7) and located on two sides of the pull rod (53), guide rails (76) are installed on the side supporting plates (73), slide blocks (77) in sliding connection with the guide rails (76) are arranged on two sides of the upper mounting plate (75), a loading end of the vertical loading device (1) is connected with the upper side of the upper mounting plate (75), and the angle adjusting device (2) is installed on the lower side of the upper mounting plate (75).
10. The tie-rod based rubber node three-way fatigue testing device according to any one of claims 1-5, wherein an angle detecting device (8) is mounted on the tie rod (53), and the angle detecting device (8) is composed of a dual-axis tilt sensor.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115597853A (en) * 2022-11-28 2023-01-13 泰州市华驰不锈钢制品有限公司(Cn) Life detection device of multi-angle hinge

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