Polyurethane support detection compression-shear testing machine

Abstract

The application relates to the technical field of detection, in particular to a compression-shear testing machine for polyurethane support detection, which comprises a rack, an upper pressing plate, a supporting plate, a rotating shaft, a sleeve, a push block and an adjusting assembly, a polyurethane support is arranged between the upper pressing plate and the supporting plate, the supporting plate is slidingly arranged on the rack; the rotating shaft is rotationally arranged on the rack and located on one side of the supporting plate in the sliding direction of the supporting plate, the sleeve is slidingly connected with the rotating shaft and is threadedly connected with the push block, one side of the supporting plate close to the rotating shaft is provided with an inclined surface, an included angle is arranged between the inclined surface and the rotating shaft, the push block is slidingly connected with the inclined surface on the supporting plate, and the adjusting assembly is used for limiting the sliding distance of the sleeve on the rotating shaft. The adjusting assembly is arranged, the sleeve will slide on the rotating shaft relative to the push block before the rotating shaft drives the push block through the sleeve; when the polyurethane support subjected to shearing force is pushed to reset until it is stationary, the sleeve will slide on the rotating shaft, so that a buffer zone is provided for observing the deformation of the polyurethane support, and the accuracy of the detection result is improved.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to a compression-shear testing machine for testing polyurethane supports. Background Technology

[0002] Polyurethane bearings are engineering bearings made primarily of polyurethane elastomer. Their core characteristics lie in the high elasticity, wear resistance, impact resistance, and fatigue resistance of polyurethane, providing stable support and dynamic performance. Compared to traditional rubber bearings, polyurethane bearings offer advantages in high strength, high damping, and toughness. However, their higher technical level and cost necessitate more precise and accurate testing of their performance. Compression-shear testing, a core experimental method for evaluating bearing performance, involves applying pressure and shear force for an extended period, followed by unloading the shear force, and then examining the bearing's recovery state and irrecoverable amount. This effectively determines the bearing's elastic recovery capacity and durability, providing crucial information for engineering design and safety assessment.

[0003] Existing compression-shear testing machines can perform tests on multiple indicators, including compressive strength, shear modulus of elasticity, and coefficient of friction. Currently, the key to shear modulus of elasticity testing lies in the precise control of shear force and the detection of the condition after unloading. In existing technologies, the application of shear force often relies on large hydraulic cylinders. While this method can provide sufficient driving force to simulate shear loads under actual working conditions, it has significant drawbacks in the unloading process. When it is necessary to remove the shear force to detect the support's recovery state, the hydraulic cylinder continuously applies a large active force to the support during the reset process. This active force is not generated by the support's own recovery but is an additional force from external equipment, which interferes with the support's natural recovery process. This leads to inaccurate results in the deformation measurement of the support after returning to its normal state. Summary of the Invention

[0004] Therefore, it is necessary to provide a compression-shear testing machine for testing polyurethane supports to address the problem of inaccurate test results from current compression-shear testing machines.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A compression-shear testing machine for testing polyurethane bearings includes a frame, an upper pressure plate, a support plate, and a shearing mechanism. The upper pressure plate is slidably mounted on the frame in a vertical direction, and the support plate is slidably mounted on the frame in a horizontal direction. The upper pressure plate is located above the support plate, and the polyurethane bearing is disposed between the support plate and the upper pressure plate. The shearing mechanism includes a rotating shaft, a sleeve, a push block, and an adjusting assembly. The rotating shaft is rotatably mounted on the frame around its own axis and is located on one side of the support plate in the sliding direction of the support plate. The extension direction of the rotating shaft axis is perpendicular to the sliding direction of the support plate. The sleeve is sleeved on the rotating shaft and is coaxial with the rotating shaft. The sleeve is slidably connected to the rotating shaft in its own axial direction. The sleeve has a first thread, and the push block is connected to the sleeve through the first thread. The side of the support plate near the rotating shaft has an inclined surface with an angle between the inclined surface and the rotating shaft. The push block is slidably connected to the inclined surface on the support plate. The adjusting assembly is used to limit the sliding distance of the sleeve on the rotating shaft.

[0007] Preferably, there are two sleeves and two push blocks. The two sleeves are arranged along the axial direction of the rotating shaft, and the first threads on the two sleeves are in opposite directions. The two sleeves slide towards each other on the rotating shaft. The two sleeves are located on both sides of the center of the support plate in the axial direction of the rotating shaft. Each push block corresponds to one sleeve. The support plate is provided with two inclined surfaces, and each push block is slidably set on one inclined surface.

[0008] Preferably, each inclined surface of the support plate is provided with a slider, and the push block is provided with a guide rail, with the slider and the guide rail being slidably connected.

[0009] Preferably, the adjusting assembly includes a rotating wheel, two positioning housings, and two positioning sleeves. The rotating wheel is fitted onto and rotatably connected to the rotating shaft. The rotating wheel is located between the two sleeves and can abut against the two sleeves. The two positioning housings are respectively disposed on the two end faces of the rotating wheel. Each positioning sleeve is slidably disposed in one positioning housing along the axial direction of the rotating shaft and fitted onto one of the sleeves. The two positioning sleeves are spaced apart from each other and can abut against the corresponding positioning housings. Each rotating shaft is provided with a second thread. The two second threads on the two rotating shafts are located between two first threads. The positioning sleeve is fitted onto the rotating shaft and threadedly connected to the sleeve through the second thread. The two second threads have opposite directions of rotation.

[0010] Preferably, a first motor is provided on the frame, and a first belt is wound around the output shaft and the pulley of the first motor.

[0011] Preferably, there are two adjusting components, each corresponding to one sleeve. Each adjusting component includes a first positioning ring, a second positioning ring, a first hydraulic cylinder, and a second hydraulic cylinder. The first and second positioning rings are disposed on the rotating shaft and located on both sides of the corresponding sleeve. The second positioning ring is slidably connected to the rotating shaft and is located between the two sleeves. One end of the first and second hydraulic cylinders is respectively disposed on one of the push blocks, and the other end of the first hydraulic cylinder abuts against the other push block. The other end of the second hydraulic cylinder is connected to the second positioning ring. The second hydraulic cylinder extends and retracts along the axial direction of the rotating shaft. The first and second hydraulic cylinders are connected through an oil pipe, and the first hydraulic cylinder controls the second hydraulic cylinder to extend and retract synchronously.

[0012] Preferably, there are two support plates, which are arranged along their own sliding direction and located on both sides of the rotating shaft, and each push block is slidably connected to the two support plates respectively.

[0013] Preferably, a second motor is provided on the frame, which is used to drive the rotating shaft to rotate.

[0014] Preferably, the frame is provided with a lower pressure plate that slides vertically, the lower pressure plate is located below the support plate, and a polyurethane support is provided between the lower pressure plate and each support plate. The frame is provided with a hydraulic column for driving the upper pressure plate and the lower pressure plate to slide vertically, and the upper pressure plate and the lower pressure plate slide towards each other.

[0015] Preferably, the frame is provided with guide columns that extend horizontally, and the support plate is slidably mounted on the guide columns.

[0016] The beneficial effects of this invention are as follows: Through the coordinated arrangement of the push block and the inclined plane, the sliding of the push block on the rotating shaft can drive the support plate to apply shear force to the polyurethane support on it. With the adjustment component, before the rotating shaft drives the push block through the sleeve, the sleeve slides relative to the push block on the rotating shaft. When the polyurethane support subjected to shear force pushes the push block back to its original position, it will remain stationary as the rotating shaft rotates, and the sleeve will slide on the rotating shaft, thus providing a buffer zone for observing the deformation of the polyurethane support and improving the accuracy of the test results. Furthermore, under the action of the adjustment component, the size of the buffer zone can be adjusted according to the magnitude of the irreversible deformation generated by the polyurethane support, improving the test efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a compression-shear testing machine for testing polyurethane supports provided in an embodiment of the present invention;

[0018] Figure 2 A front view of a compression-shear testing machine for testing polyurethane bearings provided in an embodiment of the present invention;

[0019] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0020] Figure 4 for Figure 3 Enlarged view of point C in the middle;

[0021] Figure 5 for Figure 2 Sectional view along the BB direction;

[0022] Figure 6 This is a cross-sectional view of a compression-shear testing machine for testing polyurethane bearings provided in an embodiment of the present invention;

[0023] Figure 7 for Figure 6 Enlarged view of point D in the middle;

[0024] Figure 8 This is a schematic diagram of the structure of an adjustment component provided in another embodiment of the present invention;

[0025] Figure 9 for Figure 8 Enlarged view of point E in the middle.

[0026] in:

[0027] 101. Frame; 102. Upper pressure plate; 103. Support plate; 104. Lower pressure plate; 105. Polyurethane support; 106. Guide post; 107. Rotating shaft; 108. Sleeve; 109. Push block; 110. First thread; 111. Slider; 112. Guide rail; 113. Second motor; 114. Pulley; 115. Second belt; 201. Rotary wheel; 202. Positioning housing; 203. Positioning sleeve; 204. Second thread; 205. First motor; 206. First belt; 210. First positioning ring; 211. Second positioning ring; 212. First hydraulic cylinder; 213. Second hydraulic cylinder; 214. Oil pipe; 215. Check valve; 216. Solenoid valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] like Figures 1 to 7 As shown, this embodiment of the invention provides a compression-shear testing machine for testing polyurethane supports, including a frame 101, an upper pressure plate 102, a support plate 103, and a shearing mechanism. The upper pressure plate 102 is slidably disposed on the frame 101 in the vertical direction, and the support plate 103 is slidably disposed on the frame 101 in the horizontal direction. The upper pressure plate 102 is located above the support plate 103, and the polyurethane support 105 is disposed between the support plate 103 and the upper pressure plate 102. The shearing mechanism includes a rotating shaft 107, a sleeve 108, a push block 109, and an adjusting assembly. The rotating shaft 107 is rotatably mounted on the frame 101 around its own axis. The rotating shaft 107 is located on one side of the support plate 103 in the sliding direction of the support plate 103. The extension direction of the axis of the rotating shaft 107 is perpendicular to the sliding direction of the support plate 103. The sleeve 108 is sleeved on the rotating shaft 107 and is coaxial with the rotating shaft 107. The sleeve 108 is slidably connected to the rotating shaft 107 in its own axial direction. The sleeve 108 is provided with a first thread 110. The push block 109 is connected to the sleeve 108 through the first thread 110. The side of the support plate 103 near the rotating shaft 107 is provided with an inclined surface. An angle is formed between the inclined surface and the rotating shaft 107. The push block 109 is slidably connected to the inclined surface on the support plate 103. The adjusting assembly is used to limit the sliding distance of the sleeve 108 on the rotating shaft 107.

[0032] By cooperating with the push block 109 and the inclined plane, the sliding of the push block 109 on the rotating shaft 107 can drive the support plate 103 to apply a shear force to the polyurethane support 105 on it. With an adjustment component, before the rotating shaft 107 drives the push block 109 via the sleeve 108, the sleeve 108 slides relative to the push block 109 on the rotating shaft 107. When the polyurethane support 105, subjected to shear force, pushes the push block 109 back to its original position, it will remain stationary as the rotating shaft 107 rotates, and the sleeve 108 will slide on the rotating shaft 107, thus providing a buffer zone for observing the deformation of the polyurethane support 105 and improving the accuracy of the test results. Furthermore, under the action of the adjustment component, the size of the buffer zone can be adjusted according to the magnitude of the irreversible deformation generated by the polyurethane support 105, improving the test efficiency.

[0033] In this embodiment, there are two sleeves 108 and two push blocks 109. The two sleeves 108 are arranged on the rotating shaft 107 along the axial direction of the rotating shaft 107, and the first threads 110 on the two sleeves 108 have opposite directions of rotation. The two sleeves 108 slide towards each other on the rotating shaft 107. The two sleeves 108 are located on both sides of the center of the support plate 103 in the axial direction of the rotating shaft 107. Each push block 109 corresponds to one sleeve 108. The support plate 103 is provided with two inclined surfaces. Each push block 109 is slidably disposed on one inclined surface. Under the action of the corresponding sleeves 108, the two push blocks 109 jointly apply force to the support plate 103, so as to better push the support plate 103 to slide on the frame 101.

[0034] In this embodiment, each inclined surface of the support plate 103 is provided with a slider 111, and the support plate 103 and the slider 111 are connected by bolts; each push block 109 is provided with a guide rail 112, and the guide rail 112 and the push block 109 are also connected by bolts for easy maintenance and replacement; the slider 111 is slidably connected to the guide rail 112, and the guide rail 112 is provided with a dovetail groove, in which the slider 111 is slidably disposed, and the slider 111 and the guide rail 112 will not separate in the sliding direction of the support plate 103.

[0035] In this embodiment, the adjustment assembly includes a rotating wheel 201, two positioning shells 202, and two positioning sleeves 203. The rotating wheel 201 is sleeved on and rotatably connected to the rotating shaft 107. The rotating wheel 201 is located between the two sleeves 108 and can abut against the two sleeves 108. The two positioning shells 202 are respectively disposed on the two end faces of the rotating wheel 201. Each positioning sleeve 203 is slidably disposed in one positioning shell 202 along the axial direction of the rotating shaft 107 and sleeved on one of the sleeves 108. The two positioning sleeves 203 are spaced apart from each other and can abut against the corresponding positioning shell 202. A second thread 204 is provided on the rotating shaft 107. The two second threads 204 on the two rotating shafts 107 are located between the two first threads 110. The positioning sleeve 203 is sleeved on the rotating shaft 107 and is threadedly connected to the sleeve 108 through the second threads 204. The two second threads 204 have opposite directions of rotation. The two sleeves 108 are close to each other and can abut against the rotating wheel 201. The distance between the two sleeves 108 and the rotating wheel 201 after abutting against each other can be adjusted by the positioning sleeve 203, so that the sleeves 108 can drive the push block 109 to slide on the rotating shaft 107 more quickly, improving the test efficiency. The positioning sleeve 203 rotates synchronously with the sleeve 108, thereby avoiding the relative displacement between the sleeve 108 and the positioning sleeve 203, which would cause the distance the sleeve 108 moves on the rotating shaft 107 to change.

[0036] In this embodiment, a first motor 205 is provided on the frame 101. A first belt 206 is wound around the output shaft of the first motor 205 and the wheel 201. The rotation of the first motor 205 can drive the wheel 201 to rotate through the first belt 206.

[0037] In this embodiment, there are two support plates 103. The two support plates 103 are arranged along their own sliding direction and located on both sides of the rotating shaft 107. Each push block 109 is slidably connected to the two support plates 103 respectively. The two support plates 103 slide towards each other on the frame 101 under the action of the push block 109. The polyurethane supports 105 on the two support plates 103 are subjected to shear forces in opposite directions, and the forces on the upper pressure plate 102 are also symmetrical, so the impact on the frame 101 is small.

[0038] In this embodiment, a second motor 113 is provided on the frame 101, which is used to drive the rotating shaft 107 to rotate; a pulley 114 is provided on the rotating shaft 107, and a second belt 115 is wound around the output shaft of the second motor 113 and the pulley 114. The rotation of the second motor 113 can drive the rotating shaft 107 to rotate through the pulley 114.

[0039] In this embodiment, a lower pressure plate 104 that slides vertically is provided on the frame 101. The lower pressure plate 104 is located below the support plate 103, and a polyurethane support 105 is provided between the lower pressure plate 104 and each support plate 103. By providing the lower pressure plate 104, the compression-shear testing machine for polyurethane support testing can test multiple polyurethane supports 105 at a time, improving testing efficiency. The frame 101 is provided with a hydraulic column for driving the upper pressure plate 102 and the lower pressure plate 104 to slide vertically. The upper pressure plate 102 and the lower pressure plate 104 slide towards each other. The hydraulic column adjusts the distance between the upper pressure plate 102 and the lower pressure plate 104 and the support plate 103, allowing testing of polyurethane supports 105 of different sizes.

[0040] In this embodiment, the frame 101 is provided with guide posts 106, which extend horizontally, and the support plate 103 is slidably disposed on the guide posts 106, with the guide posts 106 supporting the support plate 103.

[0041] The working principle of the compression-shear testing machine for polyurethane bearings provided in the above embodiments is as follows:

[0042] First, position the slider 111 in the middle of the corresponding guide rail 112. Then, install the polyurethane support 105 to be tested onto the upper and lower sides of the support plate 103. Next, start the hydraulic column to move the upper pressure plate 102 and the lower pressure plate 104 closer to the support plate 103 and into contact with the polyurethane support 105. Finally, connect each polyurethane support 105 to the corresponding upper pressure plate 102 or lower pressure plate 104.

[0043] During the unidirectional shear test, the polyurethane support 105 subjected to shear force needs to be held for a period of time, and its deformation after reset needs to be observed. At this time, the first motor 205 is started. The first motor 205 drives the rotating wheel 201 to rotate via the first belt 206. The rotation of the rotating wheel 201 drives the two positioning sleeves 203 to rotate, and the two positioning sleeves 203 rotate on their respective sleeves 108. Under the action of the second thread 204, the two positioning sleeves 203 move closer to each other, and then the first motor 205 stops. Next, the second motor 113 and the first motor 205 are started. The second motor 113 drives the pulley 114 to rotate via the second belt 115. The pulley 114 drives the rotating shaft 107 to rotate, and the rotating shaft 107 drives the sleeve 108 to rotate (at this time, the first motor 205 also drives the positioning sleeves 203 to rotate, and the positioning sleeves 203 and sleeves 108 rotate synchronously and are in a relatively stationary state). At this point, the sleeve 108 rotates more easily and slides on the shaft 107. The two sleeves 108 drive the corresponding positioning sleeves 203 away from each other until the positioning sleeves 203 abut against the corresponding positioning shells 202. After the positioning sleeves 203 encounter resistance, the sleeves 108 no longer slide on the shaft 107. As the shaft 107 drives the sleeves 108 to continue rotating, the push blocks 109 begin to slide relative to the shaft 107. The two push blocks 109 slide and move closer to each other, pushing the two support plates 103 away from each other. The two support plates 103 slide on the corresponding guide posts 106 and drive one end of the polyurethane support 105 to move relative to the other end.

[0044] When the shear force on the polyurethane support 105 needs to be removed, the first motor 205 and the second motor 113 are started to rotate in opposite directions. Under the action of its own elasticity, the polyurethane support 105 pushes the push block 109 to slide relative to the rotating shaft 107, and the two push blocks 109 move away from each other. When the elasticity of the polyurethane support 105 disappears, the push block 109 no longer slides relative to the rotating shaft 107. If the polyurethane support 105 is not completely reset, the rotating shaft 107 and the rotating wheel 201 will continue to rotate. The sleeve 108 rotates relative to the push block 109 under the action of the first thread 110 and slides on the rotating shaft 107. The two sleeves 108 move closer to each other and drive the corresponding positioning sleeve 203 to slide in the corresponding positioning shell 202. The two positioning sleeves 203 also move closer to each other. At this time, the rotation of the sleeve 108 will not drive the push block 109 to move, the push block 109 will not drive the support plate 103 to move, and the polyurethane support 105 will not deform, which facilitates the recording of test data of the polyurethane support 105.

[0045] During the reciprocating shear test, the first motor 205 continues to drive the rotating shaft 107 to rotate until the sleeve 108 abuts against the rotating wheel 201. The two push blocks 109 continue to move away from each other and drive the two support plates 103 to move closer to each other, so that the polyurethane support 105 is subjected to shear force again.

[0046] If the shear force on the polyurethane support 105 is large, the deformation after its reset may be greater; if the shear force on the polyurethane support 105 is small, the deformation after its reset may be smaller. Adjusting the distance of the positioning sleeve 203 on the sleeve 108 can change the movement distance of the sleeve 108 on the rotating shaft 107, thereby changing the working efficiency.

[0047] In another embodiment, such as Figure 8 and Figure 9 As shown, there are two adjustment components, each corresponding to a sleeve 108. Each adjustment component includes a first positioning ring 210, a second positioning ring 211, a first hydraulic cylinder 212, and a second hydraulic cylinder 213. The first positioning ring 210 and the second positioning ring 211 are disposed on the rotating shaft 107 and located on both sides of the corresponding sleeve 108, and are used to limit the position of the sleeve 108 on the rotating shaft 107. When the sleeve 108 abuts against the first positioning ring 210 or the second positioning ring 211, the sleeve 108 can no longer move. The second positioning ring 211 is sleeved on the rotating shaft 107 and slidably connected to the rotating shaft 107. The second positioning ring 211 is located between the two sleeves 108. One end of the first hydraulic cylinder 212 and the second hydraulic cylinder 213 are respectively set on the same push block 109. The other end of the first hydraulic cylinder 212 abuts against the other push block 109. The other end of the second hydraulic cylinder 213 is connected to the second positioning ring 211. The second hydraulic cylinder 213 extends and retracts along the axial direction of the rotating shaft 107. The first hydraulic cylinder 212 and the second hydraulic cylinder 213 are connected through the oil pipe 214. The first hydraulic cylinder 212 controls the second hydraulic cylinder 213 to extend and retract synchronously. The oil pipe 214 has two branch pipes in the middle. One branch pipe is equipped with a one-way valve 215, which allows the hydraulic oil in the first hydraulic cylinder 212 to pass through and flow into the second hydraulic cylinder 213. The other branch pipe is equipped with a solenoid valve 216, which is used to control the flow of hydraulic oil in the second hydraulic cylinder 213 into the first hydraulic cylinder 212.

[0048] The two second hydraulic cylinders 213 in the two adjustment components are respectively set on a push block 109. When the two second hydraulic cylinders 213 extend, the corresponding two second positioning rings 211 move away from each other, thereby adjusting the distance between the first positioning ring 210 and the second positioning ring 211 in one adjustment component, shortening the free sliding distance of the sleeve 108 on the rotating shaft 107, and improving the reciprocating shear test efficiency of the polyurethane support 105.

[0049] Before the two push blocks 109 are driven to move closer to each other, the rotating shaft 107 rotates, causing the two sleeves 108 to slide on the rotating shaft 107 and move away from each other. After the two sleeves 108 move away from each other, they move closer to the corresponding first positioning ring 210. When the sleeve 108 contacts the corresponding first positioning ring 210, the sleeve 108 will be in a relatively stationary state on the rotating shaft 107. The rotation of the sleeve 108 will push the push block 109 to slide on the support plate 103. Two push blocks 109 approach each other and compress the first hydraulic cylinder 212. The first hydraulic cylinder 212 contracts and injects its internal hydraulic oil into the second hydraulic cylinder 213 through the oil pipe 214 and the branch pipe equipped with a one-way valve 215 (the solenoid valve 216 is in the closed state). The hydraulic oil entering the second hydraulic cylinder 213 causes the second hydraulic cylinder 213 to contract. The contraction of the second hydraulic cylinder 213 drives the corresponding second positioning ring 211 away from the corresponding sleeve 108. The shorter the length of the first hydraulic cylinder 212, the greater the shear force on the polyurethane support 105, and the greater the irreversible deformation that may occur. The greater the distance that the sleeve 108 slides on the rotating shaft 107 needs to be to ensure that the sleeve 108 has enough distance to slide on the rotating shaft 107 when the polyurethane is reset. Meanwhile, the second positioning ring 211 can also adjust the distance between itself and the first positioning ring 210 according to the magnitude of the shear force on the polyurethane support 105, and adjust the distance of the sleeve 108 sliding on the rotating shaft 107, thereby improving the testing efficiency of the compression-shear testing machine for polyurethane support testing.

[0050] When it is necessary to adjust the extension of the first hydraulic cylinder 212, the solenoid valve 216 is opened to pull the first hydraulic cylinder 212 or compress the second hydraulic cylinder 213. The hydraulic oil in the second hydraulic cylinder 213 flows into the first hydraulic cylinder 212 through the solenoid valve 216.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A compression-shear testing machine for testing polyurethane bearings, characterized in that, include: The machine comprises a frame, an upper pressure plate, a support plate, and a shearing mechanism. The upper pressure plate is slidably mounted on the frame in a vertical direction, and the support plate is slidably mounted on the frame in a horizontal direction. The upper pressure plate is located above the support plate, and a polyurethane support is disposed between the support plate and the upper pressure plate. The shearing mechanism includes a rotating shaft, a sleeve, a push block, and an adjusting assembly. The rotating shaft is rotatably mounted on the frame around its own axis and is located on one side of the support plate in the sliding direction of the support plate. The extension direction of the rotating shaft axis is perpendicular to the sliding direction of the support plate. The sleeve is sleeved on the rotating shaft and is coaxial with the rotating shaft. The sleeve is slidably connected to the rotating shaft in its own axial direction. The sleeve has a first thread, and the push block is connected to the sleeve through the first thread. The side of the support plate near the rotating shaft has an inclined surface, and there is an angle between the inclined surface and the rotating shaft. The push block is slidably connected to the inclined surface on the support plate. The adjusting assembly is used to limit the distance the sleeve slides on the rotating shaft. There are two sleeves and two push blocks. The two sleeves are arranged along the axial direction of the rotating shaft, and the first threads on the two sleeves are turned in opposite directions. The two sleeves slide towards each other on the rotating shaft. The two sleeves are located on both sides of the center of the support plate in the axial direction of the rotating shaft. Each push block corresponds to one sleeve. The support plate is provided with two inclined surfaces, and each push block is slidably set on one inclined surface. The adjusting assembly includes a rotating wheel, two positioning housings, and two positioning sleeves. The rotating wheel is fitted onto and rotatably connected to the rotating shaft. The rotating wheel is located between the two sleeves and can abut against the two sleeves. The two positioning housings are respectively disposed on the two end faces of the rotating wheel. Each positioning sleeve is slidably disposed in one positioning housing along the axial direction of the rotating shaft and fitted onto one of the sleeves. The two positioning sleeves are spaced apart from each other and can abut against the corresponding positioning housings. Each rotating shaft is provided with a second thread. The two second threads on the two rotating shafts are located between two first threads. The positioning sleeves are fitted onto the rotating shafts and are threadedly connected to the sleeves through the second threads. The two second threads have opposite directions of rotation.

2. The compression-shear testing machine for testing polyurethane bearings according to claim 1, characterized in that, Each inclined surface of the support plate is equipped with a slider, and the push block is equipped with a guide rail, with the slider and the guide rail being slidably connected.

3. The compression-shear testing machine for testing polyurethane bearings according to claim 1, characterized in that, The frame is equipped with a first motor, and the output shaft and the pulley of the first motor are wound with a first belt.

4. The compression-shear testing machine for testing polyurethane bearings according to claim 1, characterized in that, The adjusting assembly can also be configured as follows: there are two adjusting assemblies, each corresponding to one sleeve. Each adjusting assembly includes a first positioning ring, a second positioning ring, a first hydraulic cylinder, and a second hydraulic cylinder. The first and second positioning rings are mounted on the rotating shaft and located on both sides of the corresponding sleeve. The second positioning ring is slidably connected to the rotating shaft and is located between the two sleeves. One end of the first and second hydraulic cylinders is respectively mounted on one of the push blocks, and the other end of the first hydraulic cylinder abuts against the other push block. The other end of the second hydraulic cylinder is connected to the second positioning ring. The second hydraulic cylinder extends and retracts along the axial direction of the rotating shaft. The first and second hydraulic cylinders are connected through an oil pipe, and the first hydraulic cylinder controls the second hydraulic cylinder to extend and retract synchronously.

5. The compression-shear testing machine for testing polyurethane bearings according to claim 1, characterized in that, There are two support plates, which are arranged along their own sliding direction and located on both sides of the rotating shaft. Each push block is slidably connected to the two support plates respectively.

6. The compression-shear testing machine for testing polyurethane bearings according to claim 5, characterized in that, The frame is equipped with a lower pressure plate that slides vertically. The lower pressure plate is located below the support plate, and a polyurethane support is provided between the lower pressure plate and each support plate. The frame is equipped with a hydraulic column for driving the upper pressure plate and the lower pressure plate to slide vertically. The upper pressure plate and the lower pressure plate slide towards each other.

7. The compression-shear testing machine for testing polyurethane bearings according to claim 1, characterized in that, A second motor is installed on the frame, which is used to drive the shaft to rotate.

8. The compression-shear testing machine for testing polyurethane bearings according to claim 1, characterized in that, The frame is equipped with guide columns that extend horizontally, and the support plate is slidably mounted on the guide columns.

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