A rubber joint life testing device and method thereof

Abstract

The application discloses a rubber joint life test device and a method thereof, which comprises a rack, a lifting assembly installed on one side of the top end of the rack and a bottom table fixed at the bottom of the rack, lower clamping assemblies for fastening lower end flanges of rubber joints are slidably installed on both sides of the top end of the rack, neck adjustable multi-station clamping assemblies for fastening upper end flanges of the rubber joints are arranged above the lower clamping assemblies, and a multi-link Z-direction cyclic tensile test assembly is installed at the driving end of the lifting assembly. The application utilizes reasonable mechanical structure design and multi-degree-of-freedom load application, overcomes the defects of low degree of freedom, single deformation mode and low driving efficiency of traditional test devices, improves the authenticity and efficiency of the rubber joint fatigue life test, and thus more comprehensively simulates the complex deformation behavior of the rubber joint in actual working conditions.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of rubber joint testing, in particular to a rubber joint service life testing device and method. BACKGROUND

[0002] As a key connecting element in a pipeline system, a rubber joint (expansion joint) is mainly made of rubber, and is provided with flanges at both ends to bear the functions of absorbing vibration, compensating thermal expansion and cold contraction, and buffering mechanical impact. The stability and service life of the rubber joint are directly related to the safety and reliability of the entire system. A rubber joint torsion service life testing device driven by a pneumatic cylinder or a hydraulic cylinder is mainly used for simulating the repeated torsional load borne by the rubber joint in actual working conditions to evaluate the durability and fatigue life of the rubber joint. The testing device provides torsional power through a pneumatic cylinder or a hydraulic cylinder, cooperates with a specially designed fixing clamp and a support frame to ensure that the rubber joint is uniformly stressed and stably positioned during the testing process. During the testing process, the rubber joint is repeatedly twisted until a predetermined number of cycles is reached or obvious damage occurs, and then the fatigue damage of the rubber joint is evaluated through appearance and performance inspection.

[0003] A testing device for a rubber water stop joint disclosed in CN116380690B comprises a base, a support part and a testing part for pressure testing of a water stop joint body. The testing part comprises a support fixed to the top outer wall of the base, and a piston cylinder fixed to the top outer wall of the support. The piston cylinder is provided with an injection pipe and an adjusting pipe welded to the circumferential outer wall of the piston cylinder. A piston plate is movably connected to the circumferential inner wall of the piston cylinder. The piston plate can drive a bending seat to rotate through a driving plate. The bending seat is twisted to test the torsional resistance of the bending seat. The circumferential movement of the driving plate is converted into the linear movement of a jack rod through a waist-shaped hole. The jack rod drives the piston plate to move downward to test the pressure resistance of the water stop joint body.

[0004] It can be seen that the above technical solution mainly causes the upper half of the rubber joint (expansion joint) to be bent and twisted and to be stretched in the Z direction to simulate the deformation action of the rubber joint in the actual working process. However, the simulation degree of freedom is still low, especially for the radial main body dislocation of the rubber joint, that is, the rubber joint will be subjected to radial deviation, radial dislocation, lateral bending and other complex deformation forms. This leads to the fact that the test results cannot fully reflect the stress and deformation state of the rubber joint in the actual working conditions to a certain extent, which affects the correct evaluation of the service life of the product. Moreover, the driving force of the device is generated by the electric telescopic rod and other telescopic members, the driving frequency is low, and there are inherent physical limitations in high-speed and high-frequency operation, which cannot meet the testing requirements of fast rhythm and multiple parts. SUMMARY

[0005] The purpose of the present application is to provide a rubber joint life test device and method thereof, which adjusts the initial height of the multi-link Z-direction cyclic tensile test assembly, the neck-adjustable multi-station clamping assembly according to the specifications of the rubber joint by the lifting assembly, and then the upper and lower end flanges of the plurality of rubber joints to be subjected to torsional life test are fixed by the neck-adjustable multi-station clamping assembly and the lower clamping assembly in the device, the control panel opens the rotary drive assembly to work, the rotary drive assembly simultaneously transmits power to the multi-link Z-direction cyclic tensile test assembly and the link-type forward and reverse rotation transmission assembly, the multi-link Z-direction cyclic tensile test assembly reciprocatingly stretches the plurality of rubber joints in the Z-direction, and the link-type forward and reverse rotation transmission assembly and the bidirectional side sliding tensile test assembly work together and make the lower clamping assembly horizontally slide, so as to make the plurality of rubber joints deform radially, until the rubber joint is repeatedly twisted to a predetermined number of cycles or obvious damage occurs, thereby solving the problems raised in the above background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a rubber joint life test device, comprising a rack, a lifting assembly installed on one side of the top end of the rack, and a base fixed at the bottom of the rack, both sides of the top end of the rack are slidably installed with a lower clamping assembly for fastening the lower end flange of the rubber joint, the upper side of the lower clamping assembly is provided with a neck-adjustable multi-station clamping assembly for fastening the upper end flange of the rubber joint, and the driving end of the lifting assembly is installed with a multi-link Z-direction cyclic tensile test assembly for driving the neck-adjustable multi-station clamping assembly to vertically reciprocate;

[0007] The top end of the base is installed with a bidirectional side sliding tensile test assembly for driving the two lower clamping assemblies to linearly slide towards each other and making the rubber joint fixed between the lower clamping assembly and the neck-adjustable multi-station clamping assembly radially dislocate, one side of the outer wall of the base is installed with a link-type forward and reverse rotation transmission assembly for inputting periodic forward and reverse rotation power to the bidirectional side sliding tensile test assembly, the outer wall of the base above the link-type forward and reverse rotation transmission assembly is installed with a rotary drive assembly for driving the multi-link Z-direction cyclic tensile test assembly and the link-type forward and reverse rotation transmission assembly to work, and one side of the surface of the rack is installed with a control panel, and the output end of the control panel is electrically connected with the input end of the lifting assembly and the rotary drive assembly.

[0008] Preferably, the lifting assembly comprises a vertical frame fixed at the rear position of the top end of the rack, a Z-direction sliding seat vertically slidably installed on one side of the outer wall of the vertical frame through a guide rail and a sliding table, and a gas cylinder installed on the other side of the outer wall of the vertical frame, the top end of the piston rod of the gas cylinder is fixedly connected with the bottom end of the Z-direction sliding seat, the outer wall of the side of the Z-direction sliding seat away from the vertical frame is fixed with an upper beam frame, and the neck-adjustable multi-station clamping assembly is installed at the bottom end of the upper beam frame.

[0009] Preferably, the lower clamping assembly is composed of an I-shaped support and a chuck, the I-shaped support is slidingly installed at the top end of the rack along the X-axis direction, the chuck is symmetrically installed at the front and rear positions of the top end of the I-shaped support, and the I-shaped support and the chuck are located below the upper beam frame and the Z-direction sliding seat.

[0010] Preferably, the bidirectional side-sliding tensile test assembly comprises a carrier frame fixed vertically at the top end of the base table, a sliding frame slidingly installed in the carrier frame along the vertical direction, and two fisheye inclined rods hingedly installed on the front and rear outer walls of the sliding frame, the upper end of the fisheye inclined rod is hingedly connected to the bottom end of the I-shaped support, the bidirectional side-sliding tensile test assembly further comprises a lead screw lifting module arranged at the central axis position in the carrier frame, the lead screw lifting module is used to drive the sliding frame to lift, and the lower end of the lead screw in the lead screw lifting module is driven by the connecting rod type forward and reverse rotation transmission assembly.

[0011] Preferably, the top end of the carrier frame is fixed with an H-shaped cover plate, and the two sides of the bottom end of the H-shaped cover plate are both installed with dovetail tracks for guiding the I-shaped support to slide.

[0012] Preferably, the connecting rod type forward and reverse rotation transmission assembly comprises a flat plate fixed on the outer wall of one side of the base table, a driven gear shaft rotatingly installed at the end away from the base table of the flat plate through a bearing, and a first turntable fixed at the lower end of the driven gear shaft, the flat plate is located on one side of the carrier frame, the lower end of the lead screw in the lead screw lifting module is fixed with a driven gear, the bottom end of the flat plate is slidingly installed with a lower sliding seat along the length direction of the flat plate through a guide rail and a sliding table, the outer wall of one side of the lower sliding seat is fixed with a rack for engaging with the driven gear, and the outer wall of the other side of the lower sliding seat is hingedly connected with a fisheye connecting rod one, one end of the fisheye connecting rod one is hingedly connected with the bottom end edge position of the first turntable.

[0013] Preferably, the rotary drive assembly comprises a double-output-shaft reduction motor one fixed on the outer wall of one side of the carrier frame, an inner spline shaft installed at the upper end of the output shaft of the double-output-shaft reduction motor one, and a driving gear installed at the lower end of the output shaft of the double-output-shaft reduction motor one, the driving gear is engaged with the driven gear shaft, the double-output-shaft reduction motor one is located on one side of the carrier frame and above the flat plate, the inner spline shaft is slidingly installed with an outer ring key bevel gear shaft extending vertically upward and transmitting power to the multi-connecting-rod Z-direction cyclic tensile test assembly, and the outer ring key bevel gear shaft is connected with the outer wall of one side of the Z-direction sliding seat through a vertical bearing seat.

[0014] Preferably, the multi-link Z-direction cyclic tensile test assembly comprises a hanger fixed at the bottom end of the upper beam frame, a vertical shaft two rotatably installed at both sides of the bottom end of the hanger, and a vertical shaft one rotatably installed at one side of the bottom end of the upper beam frame, one end of the surface of the vertical shaft one is fixed with a driven bevel gear for engaging with the outer ring key bevel gear shaft, both ends of the vertical shaft one are fixed with a second turntable, both ends of the vertical shaft two are fixed with an L-shaped corner seat, the lower end of the L-shaped corner seat is hingedly connected with a fisheye connecting rod two, the upper end of the fisheye connecting rod two is hingedly connected with the outer wall edge position of the second turntable, the lower end of the L-shaped corner seat is also hingedly connected with a T-shaped short column, the neck-adjustable multi-station clamping assembly is installed at the bottom end of the four T-shaped short columns, and a fisheye connecting rod three is hingedly connected between the upper ends of the adjacent two L-shaped corner seats in the same Y-axis direction.

[0015] Preferably, the neck-adjustable multi-station clamping assembly comprises a chassis fixed at the lower end of the four T-shaped short columns, short shafts rotatably installed at the front and rear positions and the left and right inner walls in the chassis, an inner U-shaped arm fixed between the adjacent two short shafts in the X-axis direction, a chuck two installed on the top wall of the inner U-shaped arm, and a sprocket transmission structure two installed between the adjacent two short shafts in one Y-axis direction, and a reduction motor two installed on one side of the outer wall of the chassis for driving the synchronous rotation of the two short shafts through the sprocket transmission structure two.

[0016] The application also provides a rubber joint life test method, and the rubber joint life test device described above, comprising the following steps:

[0017] S101: Start working of the lifting assembly through the control panel instruction, the lifting assembly adjusts the initial height of the multi-link Z-direction cyclic tensile test assembly and the neck-adjustable multi-station clamping assembly connected thereto, and a plurality of rubber joints to be tested are installed on the stations in turn, at this time, the upper end flange of the rubber joint is locked by the neck-adjustable multi-station clamping assembly, and the lower end flange is fixed by the lower clamping assembly, until all the rubber joints are in a natural and unstressed state.

[0018] S102: The control panel sends a control instruction to the rotary drive assembly, the rotary drive assembly outputs power to two transmission paths, one way of power transmission to the multi-link Z-direction cyclic tensile test assembly, the multi-link Z-direction cyclic tensile test assembly converts rotary drive into reciprocating linear motion, thereby synchronously applying vertical and periodic tensile and compressive load to all clamped rubber joints, the other way of power transmission to the connecting rod type forward and reverse rotation transmission assembly, the connecting rod type forward and reverse rotation transmission assembly converts continuous rotary motion into forward and reverse rotary drive required by the bidirectional side-sliding tensile test assembly, so that the lower clamping assembly produces horizontal sliding, and causes the rubber joint to occur radial misalignment deformation.

[0019] S103: The worker observes the state of the plurality of samples, checks whether there are cracks, bulging, interlayer peeling or abnormal deformation and other damage signs, until the cycle number recorded by the control panel reaches the preset target value, or the worker finds that one or more rubber joints are obviously damaged through observation, to manually stop the test;

[0020] S104: After the device is smoothly stopped, the worker loosens each clamping assembly in turn, removes all the samples that have completed the test, and records the final state and failure mode of each sample.

[0021] Compared with the prior art, the rubber joint life test device and method have the beneficial effects that: the rubber joint life test device and method are provided with a plurality of interrelated structures such as a multi-link Z-direction cyclic tensile test assembly, a neck-adjustable multi-station clamping assembly, a lower clamping assembly, a rotary drive assembly, a link-type forward and reverse rotation transmission assembly and a two-way side-sliding tensile test assembly, the initial height of the multi-link Z-direction cyclic tensile test assembly and the neck-adjustable multi-station clamping assembly is adjusted by the lifting assembly according to the specifications of the rubber joint, then the upper and lower end flanges of the plurality of rubber joints to be subjected to the torsional life test are fixed by the neck-adjustable multi-station clamping assembly and the lower clamping assembly in the device, the rotary drive assembly is started by the control panel, the rotary drive assembly simultaneously transmits power to the multi-link Z-direction cyclic tensile test assembly and the link-type forward and reverse rotation transmission assembly, the multi-link Z-direction cyclic tensile test assembly reciprocatingly stretches the plurality of rubber joints in the Z direction, and the link-type forward and reverse rotation transmission assembly and the two-way side-sliding tensile test assembly work in cooperation and make the lower clamping assembly horizontally slide, so as to make the plurality of rubber joints deform in the radial direction, until the rubber joints are repeatedly twisted to a predetermined cycle number or obviously damaged, the reasonable mechanical structure design and the multi-degree-of-freedom load application overcome the shortcomings of low degree of freedom, single deformation mode and low driving efficiency of the traditional test device, and improve the authenticity and efficiency of the rubber joint fatigue life test, so as to more comprehensively simulate the complex deformation behavior of the rubber joint in the actual working condition;

[0022] The upper and lower end flanges of the rubber joint are respectively fixed by the neck-adjustable multi-station clamping assembly and the lower clamping assembly, the stable position of the test piece during the test is ensured, and the test error caused by insecure clamping is avoided, the rotary drive assembly simultaneously transmits power to the multi-link Z-direction cyclic tensile test assembly and the link-type forward and reverse rotation transmission assembly, the plurality of rubber joints simultaneously bear cyclic deformation in the Z direction and the radial direction, and the neck-adjustable multi-station clamping assembly can be selectively started to perform the joint neck torsion test, the synchronous coupling of the axial tension, the radial misplacement and the optional neck torsion greatly restores the complex displacement scenarios of the rubber joint caused by thermal expansion and contraction, foundation settlement, equipment vibration and the like of the pipeline system, so that the test conditions are highly consistent with the real service environment, and the authenticity and representativeness of the fatigue life test are improved;

[0023] Secondly, this solution allows multiple rubber joints to be clamped and fixed simultaneously, undergoing identical complex load cycles in parallel during a single test run. This not only multiplies the number of sample tests that can be completed per unit time, significantly shortening the product development and verification cycle or factory inspection time, but also provides fair and synchronous testing conditions for comparing batch-to-batch quality consistency. All data are highly comparable. Furthermore, the device uses only one rotary drive component as the core power source, with power synchronously distributed to Z-axis tension and radial misalignment, fundamentally eliminating test errors caused by control asynchrony that may occur with multiple independent drives. This ensures a high degree of consistency and reliability in the testing process, and the testing frequency is also significantly increased compared to existing solutions. Attached Figure Description

[0024] Figure 1 This is a side cross-sectional view of the present invention.

[0025] Figure 2 This is a three-dimensional cross-sectional structural diagram of the present invention;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ;

[0029] Figure 6 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 4 ;

[0030] Figure 7 This is a three-dimensional structural diagram of the bidirectional lateral slip tensile testing component of the present invention. Figure 1 ;

[0031] Figure 8 This is a three-dimensional structural diagram of the bidirectional lateral slip tensile testing component of the present invention. Figure 2 ;

[0032] Figure 9 This is a three-dimensional cross-sectional view of the linkage-type forward and reverse rotation transmission assembly of the present invention;

[0033] Figure 10 This is a three-dimensional structural diagram of the linkage-type forward and reverse rotation transmission assembly of the present invention;

[0034] Figure 11 This is a schematic diagram of the three-dimensional structure of the multi-link Z-axis cyclic tensile testing assembly of the present invention. Figure 1 ;

[0035] Figure 12 This is a schematic diagram of the three-dimensional structure of the multi-link Z-axis cyclic tensile testing assembly of the present invention. Figure 2 ;

[0036] Figure 13 This is a three-dimensional structural diagram of the adjustable neck multi-station clamping assembly of the present invention.

[0037] In the diagram: 1. Frame; 2. Lifting assembly; 201. Vertical frame; 202. Cylinder; 203. Upper beam frame; 204. Z-axis slide; 3. Multi-link Z-axis cyclic tensile testing assembly; 301. Hanger; 302. Longitudinal axis one; 303. Driven bevel gear; 304. Second turntable; 305. Fisheye connecting rod two; 306. Longitudinal axis two; 307. L-shaped corner seat; 308. Fisheye connecting rod three; 309. T-shaped short column; 4. Neck adjustable multi-station clamping assembly; 401. Base frame; 402. Short shaft; 403. Inner U-shaped arm; 404. Chuck two; 405. Chain drive structure two; 406. Gear motor two; 5. Base platform; 6. Lower clamping assembly Components; 601, I-shaped support; 602, Chuck 1; 7, Bidirectional side-sliding tensile test assembly; 701, Bearing frame; 7011, H-shaped cover plate; 7012, Dovetail rail; 702, Carriage; 703, Screw lifting module; 704, Fisheye inclined bar; 8, Rotary drive assembly; 801, Internal spline shaft; 802, Double output shaft geared motor 1; 803, Drive gear; 804, Outer ring key bevel gear shaft; 9, Linkage type forward and reverse rotation transmission assembly; 901, Flat plate; 902, Driven gear shaft; 903, First turntable; 904, Lower slide seat; 905, Fisheye connecting rod 1; 906, Rack; 907, Driven gear; 10, Control panel. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Example 1, by Figures 1 to 6 The present invention includes a frame 1, a lifting assembly 2 installed on one side of the top of the frame 1, and a base 5 fixed to the bottom of the frame 1. Lower clamping assemblies 6 for fastening the lower flange of the rubber joint are slidably installed on both sides of the top of the frame 1. A neck adjustable multi-position clamping assembly 4 for fastening the upper flange of the rubber joint is provided above the lower clamping assembly 6. A multi-link Z-axis cyclic tensile testing assembly 3 is installed on the drive end of the lifting assembly 2. The multi-link Z-axis cyclic tensile testing assembly 3 is used to drive the neck adjustable multi-position clamping assembly 4 to perform vertical reciprocating motion.

[0040] The top end of the base table 5 is provided with a bidirectional side sliding tensile test assembly 7, which is used to drive the two lower clamping assembly 6 to linearly slide towards each other and make the fixed rubber joint between the lower clamping assembly 6 and the neck-adjustable multi-station clamping assembly 4 radially dislocate. One side outer wall of the base table 5 is provided with a connecting rod type forward and reverse rotation transmission assembly 9 for inputting periodic forward and reverse rotation power to the bidirectional side sliding tensile test assembly 7. The outer wall of the base table 5 above the connecting rod type forward and reverse rotation transmission assembly 9 is provided with a rotary drive assembly 8 for driving the multi-link Z-direction cyclic tensile test assembly 3 and the connecting rod type forward and reverse rotation transmission assembly 9 to work. One side of the surface of the rack 1 is provided with a control panel 10, and the output end of the control panel 10 is electrically connected with the input end of the lifting assembly 2 and the rotary drive assembly 8.

[0041] The lifting assembly 2 comprises a vertical frame 201 fixed at the top end of the rack 1 at a rear position, a Z-direction sliding seat 204 vertically slidingly installed on one side outer wall of the vertical frame 201 through a guide rail and a sliding table, and a pneumatic cylinder 202 installed on the other side outer wall of the vertical frame 201. The piston rod top end of the pneumatic cylinder 202 is fixedly connected with the bottom end of the Z-direction sliding seat 204. An upper beam frame 203 is fixedly installed on the outer wall of the side of the Z-direction sliding seat 204 away from the vertical frame 201. The neck-adjustable multi-station clamping assembly 4 is installed at the bottom end of the upper beam frame 203. When the working height of the multi-link Z-direction cyclic tensile test assembly 3 and the neck-adjustable multi-station clamping assembly 4 is controlled by the lifting assembly 2, the staff opens the pneumatic cylinder 202 to work through the control panel 10. Then the piston rod of the pneumatic cylinder 202 drives the upper beam frame 203, the multi-link Z-direction cyclic tensile test assembly 3 and the neck-adjustable multi-station clamping assembly 4 to vertically ascend and descend through the Z-direction sliding seat 204, so as to adjust the spacing between the neck-adjustable multi-station clamping assembly 4 and the lower clamping assembly 6. By adjusting the initial height of the multi-link Z-direction cyclic tensile test assembly 3 and the neck-adjustable multi-station clamping assembly 4, various types of rubber joints can be adapted, so that the rubber joint can be in a natural and non-prestressed state, and clamping instability or test errors caused by size mismatch can be avoided.

[0042] The lower clamping assembly 6 is composed of an I-shaped support 601 and a chuck 602. The I-shaped support 601 is slidingly installed on the top end of the rack 1 along the X-axis direction. The chuck 602 has at least two, and the two chucks 602 are symmetrically installed at the front and rear positions of the top end of the I-shaped support 601. The I-shaped support 601 and the chuck 602 are located below the upper beam frame 203 and the Z-direction sliding seat 204. The chuck 602 is responsible for fixing the lower end flange of the rubber joint, and cooperates with the I-shaped support 601 and the bidirectional side sliding tensile test assembly 7 to realize horizontal sliding, so as to realize the radial dislocation deformation of the subsequent rubber joint and become the execution end of applying radial load.

[0043] This embodiment provides a method for testing the lifespan of a rubber joint, using the aforementioned rubber joint lifespan testing device, comprising the following steps:

[0044] S101: The lifting assembly 2 is started to work by commanding the control panel 10. The lifting assembly 2 adjusts the initial height of the multi-link Z-axis cyclic tensile test assembly 3 and the neck adjustable multi-station clamping assembly 4 connected thereto. Multiple rubber joints to be tested are installed on the station in sequence. At this time, the upper flange of the rubber joint is locked by the neck adjustable multi-station clamping assembly 4, and its lower flange is fixed by the lower clamping assembly 6 until all rubber joints are in a natural, stress-free state.

[0045] S102: Control commands are sent to the rotary drive assembly 8 via the control panel 10. The rotary drive assembly 8 outputs power to two transmission paths. One path of power is transmitted to the multi-link Z-axis cyclic tensile test assembly 3, which converts the rotary drive into reciprocating linear motion, thereby applying vertical, periodic tensile and compressive loads to all clamped rubber joints simultaneously. The other path of power is transmitted to the linkage-type forward and reverse rotary transmission assembly 9, which converts the continuous rotary motion into the forward and reverse rotary driving force required by the bidirectional side-sliding tensile test assembly 7, causing the lower clamping assembly 6 to slide horizontally, thus causing the rubber joint to undergo radial misalignment deformation.

[0046] S103: Staff observe the condition of multiple samples to check for signs of damage such as cracking, bulging, interlayer peeling or abnormal deformation, until the number of cycles recorded by the control panel 10 reaches the preset target value, or staff find that one or more rubber joints are obviously damaged by observation, and manually stop the test.

[0047] S104: After the device stops smoothly, the staff loosens each clamping component in turn, removes all the tested samples, and records the final state and failure mode of each sample.

[0048] Example 2, based on Example 1, is... Figure 7 , Figure 8 , Figure 9 and Figure 4The bidirectional side-sliding tensile test assembly 7 is configured to cause the two lower clamping assemblies 6 to slide linearly towards each other in the horizontal plane after receiving the reciprocating rotary power input from the connecting rod type forward and reverse rotary transmission assembly 9, so as to force the main body of the rubber joint to periodically deform radially to simulate the radial misalignment caused by the misalignment of the pipeline. The bidirectional side-sliding tensile test assembly 7 comprises a bearing frame 701 fixed vertically on the top end of the base table 5, a sliding frame 702 installed in the bearing frame 701 to slide in the vertical direction, and two fisheye inclined rods 704 hingedly installed on the front and rear outer walls of the sliding frame 702. The upper end of the fisheye inclined rod 704 is hingedly connected to the bottom end of the I-shaped support 601. The bidirectional side-sliding tensile test assembly 7 further comprises a lead screw lifting module 703 arranged at the central axis position in the bearing frame 701, which is configured to drive the sliding frame 702 to ascend and descend. The lower end of the lead screw in the lead screw lifting module 703 is driven by the connecting rod type forward and reverse rotary transmission assembly 9.

[0049] The top end of the bearing frame 701 is fixed with an H-shaped cover plate 7011, and the bottom end of the H-shaped cover plate 7011 is provided with two dovetail tracks 7012 on both sides for guiding the sliding of the I-shaped support 601.

[0050] The connecting rod type forward and reverse rotary transmission assembly 9 outputs periodic forward and reverse rotary power to the lead screw lifting module 703, i.e., the lead screw lifting module 703 drives the sliding frame 702 to ascend or descend according to the angle of the forward and reverse rotary power. Here, the stage of driving the sliding frame 702 to descend by the lead screw lifting module 703 is taken as an example. During the descending process of the sliding frame 702, the I-shaped support 601, the chuck one 602 and the clamped rubber joint are driven by the fisheye inclined rod 704 to slide towards the vertical central reference plane of the bearing frame 701, i.e., the two I-shaped supports 601 move closer to each other, and the rubber joint is deformed radially once. After the ascending stage of the sliding frame 702 is performed, the sliding frame 702 continues to drive the I-shaped support 601 and the chuck one 602 to slide outward of the bearing frame 701 by the fisheye inclined rod 704, i.e., the two I-shaped supports 601 move away from each other, and the rubber joint is deformed radially again.

[0051] The connecting rod type positive and reverse rotation transmission assembly 9 comprises a flat plate 901 fixed on one side of the outer wall of the base table 5, a driven gear shaft 902 rotatably installed at the end away from the base table 5 of the flat plate 901 through a bearing, and a first rotating disc 903 fixed at the lower end of the driven gear shaft 902. The flat plate 901 is located on one side of the bearing frame 701, and the lower end of the lead screw in the lead screw lifting module 703 is fixed with a driven gear 907. The bottom end of the flat plate 901 is slidingly installed with a lower sliding seat 904 along the length direction of the flat plate 901 through a guide rail and a sliding table. One side of the outer wall of the lower sliding seat 904 is fixed with a rack 906 for engaging with the driven gear 907. The other side of the outer wall of the lower sliding seat 904 is hingedly connected with a fisheye connecting rod I 905. One end of the fisheye connecting rod I 905 is hingedly connected with the bottom end edge position of the first rotating disc 903. The rotary drive assembly 8 transmits power to the driven gear shaft 902 and the first rotating disc 903 and drives them to rotate. During the rotation of the first rotating disc 903, the first rotating disc 903 pulls the lower sliding seat 904 and the rack 906 to reciprocatingly slide along the length direction of the flat plate 901 through the fisheye connecting rod I 905, thereby continuously rotating the bidirectional side-sliding tensile test assembly 7 by using the rack 906 and the driven gear 907, so that the bidirectional side-sliding tensile test assembly 7 obtains periodic positive and reverse rotation power input of a specific angle.

[0052] The rotary drive assembly 8 comprises a double-shaft reduction motor I 802 fixed on one side of the outer wall of the bearing frame 701, an inner spline shaft 801 installed on the upper end of the output shaft of the double-shaft reduction motor I 802, and a driving gear 803 installed on the lower end of the output shaft of the double-shaft reduction motor I 802. The driving gear 803 is engaged with the driven gear shaft 902. The double-shaft reduction motor I 802 is located on one side of the bearing frame 701 and above the flat plate 901. The inner spline shaft 801 is slidingly installed with an outer ring key bevel gear shaft 804 extending vertically upward and transmitting power to the multi-link Z-direction cyclic tensile test assembly 3. The outer ring key bevel gear shaft 804 is connected with one side of the outer wall of the Z-direction sliding seat 204 through a vertical bearing seat. When the rotary drive assembly 8 works, the double-shaft reduction motor I 802 is controlled by the control panel 10, and then the lower end output shaft of the double-shaft reduction motor I 802 drives the first rotating disc 903 through the driving gear 803. The first rotating disc 903 rotates, and at the same time, the upper end output shaft of the double-shaft reduction motor I 802 drives the outer ring key bevel gear shaft 804 to rotate through the inner spline shaft 801. The outer ring key bevel gear shaft 804 inputs rotary power to the multi-link Z-direction cyclic tensile test assembly 3. During the process, the outer ring key bevel gear shaft 804 can slide in the inner spline shaft 801 according to the driving of the lifting assembly 2, so as to ensure that the rotary drive assembly 8 can synchronously provide power for the multi-link Z-direction cyclic tensile test assembly 3 and the connecting rod type positive and reverse rotation transmission assembly 9, and meet the test requirements of high frequency and multiple cycles.

[0053] In example three, on the basis of example two, Figure 11 ,Figure 12 and Figure 13 The multi-link Z-direction cyclic tensile test assembly 3 comprises a hanger 301 fixed at the bottom end of the upper beam frame 203, a longitudinal shaft two 306 rotatably installed at the bottom end of the hanger 301 on both sides, and a longitudinal shaft one 302 rotatably installed at one side of the bottom end of the upper beam frame 203. One end of the surface of the longitudinal shaft one 302 is fixed with a driven bevel gear 303 for engaging with the outer ring key bevel gear shaft 804. Both ends of the longitudinal shaft one 302 are fixed with a second turntable 304. Both ends of the longitudinal shaft two 306 are fixed with an L-shaped angle seat 307. The lower end of the L-shaped angle seat 307 is hingedly connected with a fisheye connecting rod two 305. The upper end of the fisheye connecting rod two 305 is hingedly connected with the outer wall edge position of the second turntable 304. The lower end of the L-shaped angle seat 307 is also hingedly connected with a T-shaped short column 309. A neck-adjustable multi-station clamping assembly 4 is installed at the bottom end of the four T-shaped short columns 309. A fisheye connecting rod three 308 is hingedly connected between the upper ends of the adjacent two L-shaped angle seats 307 in the same Y-axis direction.

[0054] The outer ring key bevel gear shaft 804 drives the longitudinal shaft one 302 and the second turntable 304 to rotate by the driven bevel gear 303. Since the L-shaped angle seat 307 is fixed at both ends of the longitudinal shaft two 306 and can deflect around the central axis of the longitudinal shaft two 306, the second turntable 304 will force the L-shaped angle seat 307 to deflect cyclically around the central axis of the longitudinal shaft two 306 during rotation through the fisheye connecting rod two 305. The fisheye connecting rod three 308 is used to connect the upper ends of the two L-shaped angle seats 307 in the same Y-axis direction. Then the L-shaped angle seat 307 carries the neck-adjustable multi-station clamping assembly 4 to move up and down along the Z-axis, realizing the reciprocating axial tension of the rubber joint.

[0055] The neck-adjustable multi-station clamping assembly 4 comprises a base frame 401 fixed at the bottom end of the four T-shaped short columns 309, short shafts 402 rotatably installed at the front and rear positions and the left and right inner walls inside the base frame 401. Adjacent two short shafts 402 in the X-axis direction are fixed with an inner U-shaped arm 403. The top wall of the inner U-shaped arm 403 is installed with a chuck two 404. Adjacent two short shafts 402 in one Y-axis direction are installed with a sprocket transmission structure two 405. A reduction motor two 406 for driving the two short shafts 402 to rotate synchronously through the sprocket transmission structure two 405 is installed on one side of the outer wall of the base frame 401.

[0056] The chuck two 404 is used to fix the upper end flange of the rubber joint, ensuring the clamping stability of the flange during the test. The staff can drive one of the short shafts 402 to rotate through the reduction motor two 406, which drives the other short shaft 402 to rotate through the sprocket transmission structure two 405. At this time, the two inner U-shaped arms 403 in the same axial direction of the short shaft 402 can rotate synchronously. At this time, the upper neck of the rubber joint can be twisted, thereby further improving the freedom of applying load.

[0057] In use, the embodiment of the present application first instructs the lifting assembly 2 to start working through the control panel 10 according to the specific specifications of the rubber joints to be tested, such as height and diameter, and adjusts the initial height of the multi-link Z-direction cyclic tensile testing assembly 3 and the neck-adjustable multi-station clamping assembly 4 connected thereto, in preparation for accommodating samples of different sizes. Then, a plurality of rubber joints to be tested are installed on the stations one by one. During this process, the upper end flanges of the rubber joints are locked by the neck-adjustable multi-station clamping assembly 4, and the lower end flanges are fixed by the lower clamping assembly 6, until all the rubber joints are in a natural, unstressed state, with good centering and stable clamping. The worker sets the target number of cycles and the test frequency on the control panel 10, i.e., issues a control instruction to the rotary drive assembly 8, which outputs power to two transmission paths. One route of power is transmitted to the multi-link Z-direction cyclic tensile testing assembly 3, which converts rotary drive into reciprocating linear motion, thereby synchronously applying vertical, periodic tensile and compressive loads to all clamped rubber joints. The other route of power is transmitted to the connecting rod type positive and reverse rotary transmission assembly 9, which converts continuous rotary motion into the positive and reverse rotary drive force required by the bidirectional side-sliding tensile testing assembly 7, causing the lower clamping assembly 6 to slide horizontally and causing the rubber joints to experience radial misalignment deformation, simulating the multi-directional composite deformation in actual working conditions. Under the coordinated drive of the rotary drive assembly 8, the Z-direction cyclic tensile and radial misalignment deformation are integrated synchronously, and the multiple rubber joints experience axial tension and radial misalignment simultaneously in each test cycle, simulating the working conditions they may face in real pipeline systems. During the entire process, the worker observes the state of the multiple samples to check for signs of damage such as cracking, bulging, interlayer peeling, or abnormal deformation, until the control panel 10 records the number of cycles reaching the preset target value, or the worker discovers that one or more rubber joints have been damaged significantly and manually stops the test. After the device is stopped smoothly, the worker releases each clamping assembly in turn, removes all the tested samples, and records the final state and failure mode of each sample.

[0058] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0059] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A rubber joint life test device, comprising a frame (1), a lifting assembly (2) installed on one side of the top end of the frame (1), and a base table (5) fixed at the bottom of the frame (1), characterized in that: The lower clamping assembly (6) for fastening the lower end flange of the rubber joint is slidably installed on both sides of the top end of the frame (1), and the adjustable neck multi-station clamping assembly (4) for fastening the upper end flange of the rubber joint is arranged above the lower clamping assembly (6), and the driving end of the lifting assembly (2) is provided with a multi-link Z-direction cyclic tensile test assembly (3) for driving the adjustable neck multi-station clamping assembly (4) to perform vertical reciprocating motion; The top end of the bottom table (5) is provided with a bidirectional side sliding tensile test assembly (7) for driving the two lower clamping assemblies (6) to linearly slide towards each other and causing the fixed rubber joint between the lower clamping assembly (6) and the adjustable neck multi-station clamping assembly (4) to be radially misaligned, and a link type forward and reverse rotation transmission assembly (9) for inputting periodic forward and reverse rotation power to the bidirectional side sliding tensile test assembly (7) is installed on one side of the outer wall of the bottom table (5), and a rotary drive assembly (8) is installed on the outer wall of the bottom table (5) above the link type forward and reverse rotation transmission assembly (9), and the rotary drive assembly (8) is used to drive the multi-link Z-direction cyclic tensile test assembly (3) and the link type forward and reverse rotation transmission assembly (9) to work, and one side of the surface of the frame (1) is provided with a control panel (10), and the output end of the control panel (10) is electrically connected with the input end of the lifting assembly (2) and the rotary drive assembly (8); The connecting rod type positive and reverse rotation transmission assembly (9) comprises a flat plate (901) fixed on one side outer wall of the base table (5), a driven gear shaft (902) rotatably installed at one end of the flat plate (901) away from the base table (5) through a bearing, and a first rotating disc (903) fixed at the lower end of the driven gear shaft (902), the flat plate (901) is located on one side of the bearing frame (701), the lower end of the screw in the screw lifting module (703) is fixed with a driven gear (907), the bottom end of the flat plate (901) is slidably installed with a lower sliding seat (904) along the length direction of the flat plate (901) through a guide rail and a sliding table, one side outer wall of the lower sliding seat (904) is fixed with a rack (906) used for engaging with the driven gear (907), the other side outer wall of the lower sliding seat (904) is hingedly connected with a fish eye connecting rod one (905), one end of the fish eye connecting rod one (905) is hingedly connected with the bottom end edge position of the first rotating disc (903); the rotary drive assembly (8) comprises a double-shaft reduction motor one (802) fixed on one side outer wall of the bearing frame (701), an inner spline shaft (801) installed on the upper end of the output shaft of the double-shaft reduction motor one (802), and a driving gear (803) installed on the lower end of the output shaft of the double-shaft reduction motor one (802), the driving gear (803) is engaged with the driven gear shaft (902), the double-shaft reduction motor one (802) is located on one side of the bearing frame (701) and above the flat plate (901), the inner spline shaft (801) is slidably installed with an outer ring key bevel gear shaft (804) extending vertically upward and transmitting power to the multi-connecting-rod Z-direction cyclic tensile testing assembly (3), and the outer ring key bevel gear shaft (804) is connected with one side outer wall of the Z-direction sliding seat (204) through a vertical bearing seat.

2. A rubber joint life testing apparatus according to claim 1, characterised in that: The lifting assembly (2) comprises a vertical frame (201) fixed at the top rear position of the rack (1), a Z-direction sliding seat (204) vertically slidably installed on one side outer wall of the vertical frame (201) through a guide rail and a sliding table, and a gas cylinder (202) installed on the other side outer wall of the vertical frame (201), the piston rod top end of the gas cylinder (202) is fixedly connected with the bottom end of the Z-direction sliding seat (204), one side outer wall of the Z-direction sliding seat (204) away from the vertical frame (201) is fixed with an upper beam frame (203), and the neck-adjustable multi-station clamping assembly (4) is installed at the bottom end of the upper beam frame (203).

3. A rubber joint life testing apparatus according to claim 2, characterised in that: The lower clamping assembly (6) is composed of an I-shaped support table (601) and a chuck one (602), the I-shaped support table (601) is slidably installed at the top end of the rack (1) along the X-axis direction, and the chuck one (602) has at least two, the two chucks one (602) are symmetrically installed at the front and rear positions of the top end of the I-shaped support table (601), and the I-shaped support table (601) and the chuck one (602) are located below the upper beam frame (203) and the Z-direction sliding seat (204).

4. A rubber joint life testing apparatus according to claim 3, characterised in that: The bidirectional side-sliding tensile test assembly (7) comprises a bearing frame (701) vertically fixed at the top end of the base table (5), a sliding frame (702) vertically slidingly installed inside the bearing frame (701), and two fisheye inclined rods (704) hingedly installed on the front and rear outer walls of the sliding frame (702), the upper end of the fisheye inclined rod (704) is hingedly connected with the bottom end of the I-shaped support table (601), the bidirectional side-sliding tensile test assembly (7) further comprises a lead screw lifting module (703) arranged at the middle axis position inside the bearing frame (701), the lead screw lifting module (703) is used for driving the sliding frame (702) to lift and descend, and the lower end of the lead screw in the lead screw lifting module (703) is driven by the connecting rod type forward and reverse rotation transmission assembly (9).

5. A rubber joint life testing apparatus according to claim 4, characterised in that: The top end of the bearing frame (701) is fixedly connected with an H-shaped cover plate (7011), and the bottom end of the H-shaped cover plate (7011) is provided with two dovetail rails (7012) on the two sides for guiding the sliding of the I-shaped support table (601).

6. A rubber joint life testing apparatus according to claim 5, characterised in that: The multi-connecting-rod Z-direction cyclic tensile test assembly (3) comprises a hanging frame (301) fixed at the bottom end of the upper beam frame (203), a longitudinal shaft two (306) rotatably installed at the bottom end of the two sides of the hanging frame (301), and a longitudinal shaft one (302) rotatably installed at one side of the bottom end of the upper beam frame (203), one end of the surface of the longitudinal shaft one (302) is fixedly connected with a driven bevel gear (303) used for meshing with an outer ring key bevel gear shaft (804), both ends of the longitudinal shaft one (302) are fixedly connected with a second turntable (304), both ends of the longitudinal shaft two (306) are fixedly connected with an L-shaped angle seat (307), the lower end of the L-shaped angle seat (307) is hingedly connected with a fisheye connecting rod two (305), the upper end of the fisheye connecting rod two (305) is hingedly connected with the outer wall edge position of the second turntable (304), the lower end of the L-shaped angle seat (307) is also hingedly connected with a T-shaped short column (309), the neck-adjustable multi-station clamping assembly (4) is installed at the bottom end of the four T-shaped short columns (309), and the upper ends of the adjacent two L-shaped angle seats (307) in the same Y-axis direction are hingedly connected with a fisheye connecting rod three (308).

7. A rubber joint life testing apparatus according to claim 6, characterised in that: The neck-adjustable multi-station clamping assembly (4) comprises a bottom frame (401) fixed at the lower end of the four T-shaped short columns (309), short shafts (402) rotatably installed at the front and rear positions and the left and right inner walls inside the bottom frame (401), an inner U-shaped arm (403) fixed between the adjacent two short shafts (402) in the X-axis direction, a chuck two (404) installed on the top wall of the inner U-shaped arm (403), a sprocket transmission structure two (405) installed between the adjacent two short shafts (402) in one Y-axis direction, and a reduction motor two (406) installed on one side of the outer wall of the bottom frame (401) and used for driving the two short shafts (402) to synchronously rotate through the sprocket transmission structure two (405).

8. A method of testing the lifetime of a rubber joint, comprising the rubber joint lifetime testing device according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S101: Through the control panel (10) instructs the lifting assembly (2) to start working, the lifting assembly (2) adjusts the initial height of the multi-link Z-direction cyclic tensile test assembly (3) and the neck-adjustable multi-station clamping assembly (4) connected thereto, and installs a plurality of rubber joints to be tested on the workstations in turn. At this time, the upper end flange of the rubber joint is locked by the neck-adjustable multi-station clamping assembly (4), and the lower end flange is fixed by the lower clamping assembly (6), until all the rubber joints are in a natural, unstressed state. S102: Use the control panel (10) to issue control instructions to the rotary drive assembly (8), and the rotary drive assembly (8) outputs power to two transmission paths. One way of power transmission is to the multi-link Z-direction cyclic tensile test assembly (3), and the multi-link Z-direction cyclic tensile test assembly (3) converts rotary drive into reciprocating linear motion, thereby synchronously applying vertical, periodic tensile and compressive load to all clamped rubber joints. The other way of power transmission is to the connecting rod type positive and negative rotary transmission assembly (9), which converts continuous rotary motion into the positive and negative rotary driving force required by the bidirectional side-sliding tensile test assembly (7), so that the lower clamping assembly (6) generates horizontal sliding, causing the rubber joint to occur radial misalignment deformation. S103: The worker observes the state of the multiple samples and checks whether there are signs of cracking, bulging, interlayer peeling or abnormal deformation damage. Until the control panel (10) records the number of cycles reaching the preset target value, or the worker observes that one or more rubber joints are obviously damaged, the test is manually stopped. S104: After the device is stopped smoothly, the worker loosens each clamping assembly in turn, removes all the tested samples, and records the final state and failure mode of each sample.

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