A stiffness testing device for a single isolator

Abstract

The present invention relates to the technical field of stiffness detection, and particularly to a stiffness testing device for a single isolator, which includes a frame, a cylinder block, a piston rod, a sliding ring and a sealing ring. The frame is fixedly arranged, the cylinder block is fixedly arranged on the frame, one end of the piston rod is slidably arranged in the cylinder block along its own axial direction, the sliding ring is sleeved on the piston rod, the sealing ring is sleeved on the sliding ring, the sealing ring is made of a flexible material, both ends of the sealing ring are turned towards the direction close to the sliding ring and are respectively fixedly connected with the sliding ring, the sealing ring and the sliding ring enclose a first cavity that extends circumferentially around the piston rod and has an adjustable internal pressure, and the sealing ring contacts the inner wall of the cylinder block. The length of the sealing ring in the axial direction of the piston rod is greater than the distance between both ends of the sealing ring in the axial direction of the piston rod. The pressure in the first cavity is adjustable, which can change the contact pressure between the sealing ring and the inner wall of the cylinder block, so as to ensure the sealing effect inside the cylinder block according to different usage conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of stiffness detection, and particularly to a stiffness testing device for a single isolator. Background Art

[0002] When evaluating the performance of a single isolator, stiffness testing is a key link, and usually a compression-shear testing machine is used to complete this detection.

[0003] In the hydraulic system of the compression-shear testing machine, the piston head seal ring is prone to sliding deformation, which further aggravates wear. This not only shortens the service life of the seal ring and increases the maintenance cost of the equipment, but also when the seal ring wears to a certain extent, it will lead to a decline in the sealing performance, causing problems such as hydraulic oil leakage and unstable pressure of the hydraulic system. And the stiffness testing of a single isolator requires precise pressure and displacement control, and the instability of the hydraulic system will cause measurement errors and reduce the accuracy of the test. In addition, if there is a large instantaneous load when the piston head starts, the force between the piston head and the cylinder wall will be too large, which is likely to cause oil leakage, reduce the system pressure, affect the performance of the entire hydraulic system, and ultimately make the compression-shear testing machine unable to accurately and stably test the stiffness of a single isolator. Summary of the Invention

[0004] Based on this, in view of the problem that the hydraulic system is prone to instability when the compression-shear testing machine tests the performance of a single isolator, which affects the test results, it is necessary to provide a stiffness testing device for a single isolator.

[0005] The above object is achieved by the following technical solutions:

[0006] A stiffness testing device for a single isolator includes a frame, a clamping mechanism, and a hydraulic mechanism. The frame is fixedly arranged, the clamping mechanism is arranged on the frame and is used for clamping the single isolator. The hydraulic mechanism includes a cylinder body, a piston rod, and a sealing assembly. The cylinder body is fixedly arranged on the frame, one end of the piston rod is slidably arranged in the cylinder body along its own axial direction, and the other end of the piston rod is connected to the clamping mechanism. The sealing assembly includes a sliding ring, a sealing ring, and an adjusting part. The sliding ring is sleeved on the piston rod and slides along the axial direction of the piston rod. The sealing ring is sleeved on the sliding ring, the sealing ring is made of a flexible material, both ends of the sealing ring are turned towards the sliding ring and fixedly connected to the sliding ring respectively. The sealing ring and the sliding ring enclose a first cavity that extends circumferentially around the piston rod and has an adjustable internal pressure, and the sealing ring contacts the inner wall of the cylinder body. The length of the sealing ring in the axial direction of the piston rod is greater than the distance between both ends of the sealing ring in the axial direction of the piston rod; the adjusting part is used to control the sliding ring to slide along the axial direction of the piston rod.

[0007] The sealing assembly has a first state and a second state. In the first state, the lengths of the sealing rings at both ends of the sliding ring are the same in the axial direction of the piston rod. In the second state, in the advancing direction of the piston rod, the length of the part of the sealing ring in front of the contact position with the sliding ring is less than the length of the part of the sealing ring behind the contact position with the sliding ring in the axial direction of the piston rod.

[0008] Preferably, there are two sliding rings and two sealing rings. The sliding rings are arranged along the axial direction of the piston rod on the piston rod. Each sealing ring is arranged on one sliding ring. There is an annular cavity between the two sealing rings. And the two sealing rings slide along the axial direction of the piston rod on the piston rod. There are a first cavity and a second cavity for storing hydraulic oil in the piston rod. The first cavity and the second cavity can be unidirectionally communicated with the annular cavity respectively. And the hydraulic oil in the first cavity can flow into the annular cavity. The hydraulic oil in the annular cavity can flow into the second cavity.

[0009] Preferably, the first cavity and the second cavity are located on both sides of the axis of the piston rod.

[0010] Preferably, in the initial state, the first cavity is filled with hydraulic oil, the second cavity is not filled with hydraulic oil, and the annular cavity is not fully filled with hydraulic oil.

[0011] Preferably, there are steps on the circumferential surface of the piston rod. The two sliding rings are both slidably arranged on the steps. There are two adjusting parts. Each adjusting part corresponds to one sealing ring. Each adjusting part includes a sealing plate, a retaining ring, a connecting block and a power component. The sealing plate is sleeved on the piston rod, and the sealing plate abuts against the end face of the step. The sealing plate is slidably connected with the sliding ring. There are an annular groove and a plurality of sliding grooves on the end face of the step. The retaining ring is slidably arranged in the annular groove along the axial direction of the piston rod. The sealing plate is connected with the annular groove. The plurality of sliding grooves are evenly arranged around the circumferential surface of the annular groove. The sliding grooves are away from the axis of the piston rod relative to the annular groove. Each sliding groove communicates with the annular groove, and the sliding groove penetrates through the circumferential surface of the piston rod along the radial direction of the piston rod. There are a plurality of connecting blocks. Each connecting block is slidably arranged in one of the sliding grooves, and the connecting blocks are respectively connected with the sliding ring and the retaining ring. The sealing plate, the sliding ring, the connecting block and the retaining ring jointly divide the sliding groove and the annular groove into a second cavity and a third cavity which are airtight and have variable volumes. The second cavity and the third cavity are located on both sides of the retaining ring in the axial direction of the piston rod. The power component is arranged in the second cavity and the third cavity for pushing the retaining ring to slide along the axial direction of the piston rod.

[0012] Preferably, the power component includes a first flow channel, a second flow channel and an oil supply tank. The first flow channel and the second flow channel are both arranged inside the piston rod. And one end of the first flow channel communicates with the second cavity, and one end of the second flow channel communicates with the third cavity. The oil supply tank is arranged outside the cylinder block. And the end of the first flow channel away from the second cavity and the end of the second flow channel away from the third cavity both penetrate through the part of the piston rod outside the cylinder block and communicate with the oil supply tank.

[0013] Preferably, the size of the sealing plate in the radial direction of the piston rod is greater than the distance from the connection position where the sliding ring slides with the sealing plate to the axis of the piston rod. A receiving groove is formed on the surface of the sealing plate close to the corresponding sliding ring, and one end of the sliding ring close to the corresponding sealing plate is slidably disposed in the receiving groove.

[0014] Preferably, there is a spacing between each sealing plate and the corresponding sealing ring.

[0015] Preferably, the first cavity is filled with liquid.

[0016] Preferably, the clamping mechanism includes a fixed seat, a sliding plate and an extrusion seat. The fixed seat is fixedly installed on the frame. The sliding plate is slidably disposed on the fixed seat along the axial direction of the piston rod, and the sliding plate is fixedly connected to the piston rod. The extrusion seat is slidably disposed on the frame along a first direction perpendicular to the axial direction of the piston rod. The single isolator is placed between the extrusion seat and the sliding plate.

[0017] The beneficial effects of the present invention are as follows: The pressure in the first cavity is adjustable, which can change the contact pressure between the sealing ring and the inner wall of the cylinder body, so as to ensure the sealing effect inside the cylinder body according to different usage conditions; Through the cooperation between the sealing ring and the inner wall of the cylinder body and the sliding ring respectively, when the sealing ring rotates and is connected to the inner wall of the cylinder body, the sealing ring can roll and contact with the inner wall of the cylinder body, and the contact part is relatively stationary, shortening the distance that the piston rod slides to drive the sealing ring to slide relative to the inner wall of the cylinder body. When the piston rod detects the single isolator through the clamping mechanism, the reciprocating movement of the piston rod drives the sealing ring to move a smaller distance relative to the inner wall of the cylinder body, reducing the wear of the sealing ring, improving its service life, and at the same time increasing the stability of the reciprocating movement of the piston rod; The sliding ring is slidably disposed relative to the piston rod, which can adjust the state of the sealing ring relative to the piston rod, so that the sealing ring is in the first state as much as possible when the piston rod slides, reducing the relative sliding distance between the sealing ring and the inner wall of the cylinder body. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a single isolator stiffness testing device provided by an embodiment of the present invention;

[0019] Figure 2 It is a schematic structural diagram of a hydraulic mechanism of a single isolator stiffness testing device provided by an embodiment of the present invention;

[0020] Figure 3 It is a split view of a hydraulic mechanism of a single isolator stiffness testing device provided by an embodiment of the present invention;

[0021] Figure 4 It is a right view of a hydraulic mechanism of a single isolator stiffness testing device provided by an embodiment of the present invention;

[0022] Figure 5 is Figure 4 a sectional view taken along line A-A in

[0023] Figure 6 is Figure 5 an enlarged view of part B in

[0024] Figure 7 is Figure 5 an enlarged view of part C in

[0025] Figure 8 a schematic structural view of the piston rod of a single isolator stiffness testing device provided by an embodiment of the present invention;

[0026] Figure 9 a sectional view of the sliding ring of a single isolator stiffness testing device provided by an embodiment of the present invention.

[0027] Wherein: 100, frame; 101, cylinder block; 102, piston rod; 103, sliding ring; 104, sealing ring; 105, first cavity; 106, annular cavity; 201, first groove; 202, first arc plate; 203, first one-way valve; 204, second groove; 205, second arc plate; 206, second one-way valve; 207, sealing plate; 208, retaining ring; 209, connecting block; 210, receiving groove; 302, pipeline; 303, second cavity; 304, third cavity; 305, first flow channel; 306, second flow channel; 307, third flow channel; 308, fourth flow channel; 401, fixed seat; 402, sliding plate; 403, extrusion seat; 404, single isolator. Specific Embodiments

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below through embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any sequential or technical meaning. The terms "connection" and "coupling" used in the present invention, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0030] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] As Figures 1 to 9 shown, an embodiment of the present invention provides a stiffness testing device for a single isolator, which includes a frame 100, a clamping mechanism and a hydraulic mechanism. The frame 100 is fixedly arranged. The clamping mechanism is arranged on the frame 100 and is used for clamping the single isolator 404. The hydraulic mechanism includes a cylinder block 101, a piston rod 102 and a sealing assembly. The cylinder block 101 is fixedly arranged on the frame 100. One end of the piston rod 102 is slidably arranged in the cylinder block 101 along its own axial direction. The cylinder block 101 is filled with hydraulic oil, and two oil holes are opened on the cylinder block 101. The two oil holes are respectively located on both sides of the sealing assembly in the axial direction of the piston rod 102. Oil is injected into the cylinder block 101 through one of the oil holes, and the other oil hole is used for pumping oil out. The piston rod 102 can be pushed to slide along its own axial direction through the sealing assembly. The other end of the piston rod 102 is connected to the clamping mechanism. The sealing assembly includes a sliding ring 103, a sealing ring 104 and an adjusting part. The sliding ring 103 is sleeved on the piston rod 102, and the sliding ring 103 slides along the axial direction of the piston rod 102. The sealing ring 104 is sleeved on the sliding ring 103. The sealing ring 104 is made of a flexible material. Both ends of the sealing ring 104 are turned towards the sliding ring 103 and are respectively fixedly connected to the sliding ring 103. The sealing ring 104 and the sliding ring 103 enclose a first cavity 105 that extends circumferentially around the piston rod 102 and has an adjustable internal pressure, and the sealing ring 104 is in contact with the inner wall of the cylinder block 101. The length of the sealing ring 104 in the axial direction of the piston rod 102 is greater than the distance between both ends of the sealing ring 104 in the axial direction of the piston rod 102; the adjusting part is used to control the sliding ring 103 to slide along the axial direction of the piston rod 102.

[0032] The sealing assembly has a first state and a second state. In the first state, the lengths of the sealing rings 104 at both ends of the sliding ring 103 are the same in the axial direction of the piston rod 102; in the second state, in the advancing direction of the piston rod 102, the length of the part of the sealing ring 104 in front of the contact position with the sliding ring 103 in the axial direction of the piston rod 102 is less than the length of the part of the sealing ring 104 behind the contact position with the sliding ring 103 in the axial direction of the piston rod 102.

[0033] The pressure inside the first cavity 105 is adjustable, which can change the contact pressure between the sealing ring 104 and the inner wall of the cylinder block 101, so as to ensure the sealing effect inside the cylinder block 101 according to different usage conditions; through the cooperative setting between the sealing ring 104 and the inner wall of the cylinder block 101 and the sliding ring 103 respectively, during the process of the sealing ring 104 being rotationally connected to the inner wall of the cylinder block 101, the sealing ring 104 can rollingly contact the inner wall of the cylinder block 101, and its contact part is relatively stationary, shortening the distance that the piston rod 102 slides to drive the sealing ring 104 to slide relative to the inner wall of the cylinder block 101. When the piston rod 102 detects the single isolator 404 through the clamping mechanism, the reciprocating movement of the piston rod 102 drives the sealing ring 104 to move a smaller distance relative to the inner wall of the cylinder block 101, reducing the wear of the sealing ring 104 and increasing its service life. At the same time, the stability of the reciprocating movement of the piston rod 102 is increased; the sliding ring 103 is slidably arranged relative to the piston rod 102, which can adjust the state of the sealing ring 104 relative to the piston rod 102, so that the sealing ring 104 is in the first state as much as possible when the piston rod 102 slides, reducing the relative sliding distance between the sealing ring 104 and the inner wall of the cylinder block 101.

[0034] In this embodiment, there are two sliding rings 103 and two sealing rings 104. The sliding rings 103 are arranged along the axial direction of the piston rod 102 on the piston rod 102. Each sealing ring 104 is disposed on one sliding ring 103. An annular cavity 106 is provided between the two sealing rings 104. And the two sealing rings 104 slide along the axial direction of the piston rod 102 on the piston rod 102. A first cavity and a second cavity for storing hydraulic oil are provided in the piston rod 102. The first cavity and the second cavity can be unidirectionally communicated with the annular cavity 106 respectively. And the hydraulic oil in the first cavity can flow into the annular cavity 106, and the hydraulic oil in the annular cavity 106 can flow into the second cavity. The first cavity is composed of a first groove 201 and a first arc plate 202. The first groove 201 is formed on the circumferential surface of the piston rod 102. The first arc plate 202 is disposed on the circumferential surface of the piston rod 102, and the first arc plate 202 covers the first groove 201. The first arc plate 202 is located in the annular cavity 106. A plurality of first one-way valves 203 are provided on the first arc plate 202. The hydraulic oil in the first cavity flows into the annular cavity 106 through the first one-way valves 203. The plurality of first one-way valves 203 are evenly distributed around the circumferential surface of the piston rod 102 on the first arc plate 202. The second cavity is composed of a second groove 204 and a second arc plate 205. The second groove 204 is formed on the circumferential surface of the piston rod 102. The second arc plate 205 is disposed on the circumferential surface of the piston rod 102, and the second arc plate 205 covers the second groove 204. The second arc plate 205 is located in the annular cavity 106. A plurality of second one-way valves 206 are provided on the second arc plate 205. The hydraulic oil in the annular cavity 106 flows into the second cavity through the second one-way valves 206. The plurality of second one-way valves 206 are evenly distributed around the circumferential surface of the piston rod 102 on the second arc plate 205.

[0035] In this embodiment, the first cavity and the second cavity are located on both sides of the axis of the piston rod 102. The first groove 201 and the second groove 204 are arc-shaped and extend respectively around the circumferential direction of the piston rod 102. The first groove 201 and the second groove 204 are symmetrically arranged with respect to the vertical plane where the axis of the piston rod 102 is located.

[0036] In this embodiment, in the initial state, the first cavity is filled with hydraulic oil, the second cavity is not filled with hydraulic oil, and the annular cavity 106 is not filled with hydraulic oil completely. After the piston rod 102 slides along its own axial direction, the hydraulic oil that acts as an oil film on the sealing ring 104 and is cured or deteriorated enters the annular cavity 106. Then, the two adjusting parts control the corresponding two sealing rings 104 to approach each other, the volume of the annular cavity 106 decreases, the pressure increases, and the hydraulic oil in the space will enter the second cavity through the second one-way valve 206; when the two adjusting parts control the corresponding two sealing rings 104 to move away from each other, the volume of the annular cavity 106 increases, the pressure decreases, and the hydraulic oil in the first cavity will enter the annular cavity 106 through the first one-way valve 203, reducing the influence of the cured or deteriorated hydraulic oil on the sealing performance of the sealing ring 104.

[0037] In this embodiment, a step is provided on the circumferential surface of the piston rod 102, and the two sliding rings 103 are both slidably arranged on the step; there are two adjusting parts, each adjusting part corresponds to a sealing ring 104, and each adjusting part includes a sealing plate 207, a retaining ring 208, a connecting block 209 and a power component. The sealing plate 207 is sleeved on the piston rod 102, and the sealing plate 207 abuts against the end surface of the step. The sealing plate 207 is slidably connected with the sliding ring 103. An annular groove and a plurality of sliding grooves are formed on the end surface of the step. The retaining ring 208 is slidably arranged in the annular groove along the axial direction of the piston rod 102, and the sealing plate 207 is connected with the annular groove. The plurality of sliding grooves are evenly arranged around the circumferential surface of the annular groove. The sliding grooves are away from the axis of the piston rod 102 relative to the annular groove. Each sliding groove communicates with the annular groove, and the sliding groove penetrates through the circumferential surface of the piston rod 102 along the radial direction of the piston rod 102. There are a plurality of connecting blocks 209, and each connecting block 209 is slidably arranged in one of the sliding grooves and is respectively connected with the sliding ring 103 and the retaining ring 208; the sealing plate 207, the sliding ring 103, the connecting block 209 and the retaining ring 208 jointly divide the sliding groove and the annular groove into a sealed and variable-volume second cavity 303 and a third cavity 304. The second cavity 303 and the third cavity 304 are located on both sides of the retaining ring 208 in the axial direction of the piston rod 102. The power component is arranged in the second cavity 303 and the third cavity 304 and is used to push the retaining ring 208 to slide along the axial direction of the piston rod 102.

[0038] In this embodiment, the power component includes a first flow channel 305, a second flow channel 306, and a fuel supply tank. The first flow channel 305 and the second flow channel 306 are both provided inside the piston rod 102. One end of the first flow channel 305 communicates with the second cavity 303, and one end of the second flow channel 306 communicates with the third cavity 304. The fuel supply tank is arranged outside the cylinder block 101. The end of the first flow channel 305 far from the second cavity 303 and the end of the second flow channel 306 far from the third cavity 304 both penetrate through the part of the piston rod 102 outside the cylinder block 101 and communicate with the fuel supply tank. The fuel supply tank can respectively control the flow direction of the hydraulic oil in the first flow channel 305 and the second flow channel 306, so as to control the amount of hydraulic oil in the second cavity 303 and the third cavity 304. The change in the amount of hydraulic oil in the second cavity 303 and the third cavity 304 is inversely proportional. When the amount of hydraulic oil in the second cavity 303 increases, the amount of hydraulic oil in the third cavity 304 relatively decreases.

[0039] In this embodiment, the size of the sealing plate 207 in the radial direction of the piston rod 102 is greater than the distance from the connection position where the sliding ring 103 slides with the sealing plate 207 to the axis of the piston rod 102. A receiving groove 210 is formed on the surface of the sealing plate 207 close to the corresponding sliding ring 103. One end of the sliding ring 103 close to the corresponding sealing plate 207 is slidably arranged in the receiving groove 210. The cooperation of the sliding ring 103 and the sealing plate 207 can increase the sealing distance between the second cavity 303 and the inside of the cylinder body, and relatively improve the sealing effect of the second cavity 303.

[0040] In this embodiment, there is a spacing between each sealing plate 207 and the corresponding sealing ring 104. When the piston rod 102 slides in the cylinder block 101, the sealing plate 207 will not interfere with the state switching of the sealing ring 104.

[0041] In this embodiment, the first cavity 105 is filled with a liquid. The liquid is not easily compressed relative to the gas, and the internal pressure in the first cavity 105 is more stable. Third flow channels 307 are formed on the sliding ring 103, the connecting block 209, and the retaining ring 208. One end of the third flow channel 307 communicates with the first cavity 105, and one end of the second flow channel 306 communicates with the third cavity 304. A fourth flow channel 308 is provided in the piston rod 102. One end of the fourth flow channel 308 penetrates through the part of the piston rod 102 outside the cylinder block 101 and communicates with the fuel supply tank. The other end of the fourth flow channel 308 and the end of the third flow channel 307 far from the third cavity 304 are connected through a pipeline 302. One end of the pipeline 302 is fixedly installed on the surface of the retaining ring 208 inside the third cavity 304, and the other end of the pipeline 302 is slidably arranged in the fourth flow channel 308 along the axial direction of the piston rod 102.

[0042] In this embodiment, the clamping mechanism includes a fixed seat 401, a sliding plate 402 and a pressing seat 403. The fixed seat 401 is fixedly installed on the frame 100. The sliding plate 402 is slidably arranged on the fixed seat 401 along the axial direction of the piston rod 102, and the sliding plate 402 is fixedly connected to the piston rod 102. The pressing seat 403 is slidably arranged on the frame 100 along a first direction, and the first direction is perpendicular to the axial direction of the piston rod 102. The single isolator 404 is placed between the pressing seat 403 and the sliding plate 402. The first direction is the vertical direction. After the pressing seat 403 and the sliding plate 402 fix the single isolator 404, the hydraulic mechanism can drive the sliding plate 402 to reciprocate horizontally to detect the stiffness of the single isolator 404.

[0043] The working principle of a single isolator stiffness testing device provided by the above embodiment is as follows:

[0044] First, place the single isolator 404 to be tested on the sliding plate 402, then control the pressing seat 403 to move downward and jointly clamp the single isolator 404 with the sliding plate 402. Then, inject hydraulic oil into the cylinder block 101 through one of the oil holes on the cylinder block 101 far from the single isolator 404. The hydraulic oil on the side of the sealing component in the cylinder block 101 far from the single isolator 404 increases, pushing the piston rod 102 to move in the direction close to the fixed seat 401. The piston rod 102 pushes the sliding plate 402 to slide on the fixed seat 401, and the sliding plate 402 drives one end of the single isolator 404 to perform a shearing motion relative to the other end. The hydraulic oil on the side of the sealing component in the cylinder block 101 close to the single isolator 404 drains through the corresponding oil hole.

[0045] When the sliding plate 402 drives the single isolator 404 to move a certain distance, control the inlet and outlet oil directions of the two oil holes on the cylinder block 101 to flow in the reverse direction. The piston rod 102 moves in the direction away from the fixed seat 401 and drives the sliding plate 402 to slide reversely on the fixed seat 401. The sliding plate 402 drives the single isolator 404 to perform a shearing motion again.

[0046] Before the piston rod 102 slides in the cylinder block 101, the two sealing rings 104 are in the first state. Then, as the piston rod 102 slides through the retaining ring 208 and the connecting block 209 to drive the sliding ring 103 to slide, the sliding ring 103 drives the two ends of the sealing ring 104 to move, and the two sealing rings 104 switch from the first state to the second state. In the moving direction of the sliding ring 103, the part located in front of the front end of the sealing ring 104 and not in contact with the inside of the cylinder block 101 gradually approaches the inner wall of the cylinder block 101, and the part located behind the rear end of the sealing ring 104 and in contact with the inside of the cylinder block 101 gradually moves away from the inner wall of the cylinder block 101. The sealing ring 104 in contact with the inner wall of the cylinder block 101 remains stationary relative to the rod cylinder block 101. As the sliding ring 103 moves, the position where the inner wall of the cylinder block 101 contacts the sealing ring 104 moves in the moving direction of the sliding ring 103 until the part in front of the front end of the sealing ring 104 can no longer contact the inner wall of the cylinder block 101. At this time, the part of the sealing ring 104 in contact with the inner wall of the cylinder block 101 slides relative to the inner wall of the cylinder block 101. Within the reciprocating sliding range of the piston rod 102, if it is ensured that the part in front of the front end of the sealing ring 104 can still approach the inside of the cylinder block 101, then the part of the sealing ring 104 in contact with the inner wall of the cylinder block 101 will not slide relative to the inner wall of the cylinder block 101, reducing the sliding wear of the sealing ring 104.

[0047] Before the piston rod 102 slides, if the sealing ring 104 is not in the first state, hydraulic oil can be first transported to the first flow channel 305 or the second flow channel 306 through the oil supply tank. The hydraulic oil enters the second cavity 303 through the first flow channel 305 or enters the third cavity 304 through the second flow channel 306. The hydraulic oil entering the second cavity 303 or the third cavity 304 will push the retaining ring 208 and the connecting block 209 to move, and the connecting block 209 drives the sliding ring 103 to move, causing the sealing ring 104 to switch to the first state.

[0048] If the single isolator stiffness test device has not been used for a long time, the oil film between the sealing ring 104 and the cylinder block 101 is likely to solidify or have other problems; when the sealing ring 104 switches from the first state to the second state, part of the oil film between the sealing ring 104 and the cylinder block 101 will enter the hydraulic oil in the annular cavity 106. When there is too much old oil film in the hydraulic oil in the annular cavity 106, the supply oil tank can be controlled to make the two retaining rings 208 approach each other. The two retaining rings 208 drive the corresponding two sealing rings 104 to approach each other through the corresponding connecting blocks 209. The volume of the annular cavity 106 decreases, the pressure in the annular cavity 106 increases, and the second one-way valve 206 opens. The hydraulic oil in the annular cavity 106 enters the second cavity; then the supply oil tank is controlled to make the two retaining rings 208 move away from each other. The two retaining rings 208 drive the corresponding two sealing rings 104 to move away from each other through the corresponding connecting blocks 209. The volume of the annular cavity 106 increases, the pressure in the annular cavity 106 decreases, the second one-way valve 206 closes, and the first one-way valve 203 opens. The hydraulic oil in the first cavity enters the annular cavity 106 to complete the replacement, reducing the impact of the solidified oil film on the sealing performance of the sealing ring 104.

[0049] At the moment when the piston rod 102 moves, the pressure inside the cylinder block 101 increases, and the starting load of the piston rod 102 is relatively large. The supply oil tank can be controlled to inject part of the hydraulic oil into the first cavity 105 through the fourth flow channel 308 and the third flow channel 307, increasing the pressure inside the first cavity 105 and improving the sealing performance of the sealing ring 104.

[0050] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A single vibration isolator stiffness testing device, characterized in that: include: A frame, a clamping mechanism and a hydraulic mechanism. The frame is fixedly arranged. The clamping mechanism is arranged on the frame and is used to clamp the single vibration isolator. The hydraulic mechanism includes a cylinder body, a piston rod and a sealing assembly. The cylinder body is fixedly arranged on the frame. One end of the piston rod is slidably arranged in the cylinder body along its own axial direction. The other end of the piston rod is connected to the clamping mechanism. The sealing assembly includes a sliding ring, a sealing ring and an adjusting part. The sliding ring is sleeved on the piston rod and slides along the axial direction of the piston rod. The sealing ring is sleeved on the sliding ring. The sealing ring is made of a flexible material. The two ends of the sealing ring are flipped in a direction close to the sliding ring and are fixedly connected to the sliding ring respectively. The sealing ring and the sliding ring form a closed first cavity extending around the circumference of the piston rod and with adjustable internal pressure. The sealing ring contacts the inner wall of the cylinder body. The length of the sealing ring in the axial direction of the piston rod is greater than the distance between the two ends of the sealing ring in the axial direction of the piston rod. The adjusting part is used to control the sliding ring to slide along the axial direction of the piston rod. The sealing assembly has a first state and a second state. In the first state, the sealing rings at both ends of the sliding ring have the same length in the axial direction of the piston rod; in the second state, in the advancing direction of the piston rod, the length of the portion of the sealing ring in front of the contact position with the sliding ring in the axial direction of the piston rod is smaller than the length of the portion of the sealing ring in the rear of the contact position with the sliding ring in the axial direction of the piston rod; There are two sliding rings and two sealing rings. The sliding rings are arranged on the piston rod along the axial direction of the piston rod. Each sealing ring is arranged on a sliding ring. An annular cavity is arranged between the two sealing rings, and the two sealing rings slide on the piston rod along the axial direction of the piston rod. A first cavity and a second cavity for storing hydraulic oil are arranged in the piston rod. The first cavity and the second cavity can be connected to the annular cavity in one way respectively, and the hydraulic oil in the first cavity can flow into the annular cavity, and the hydraulic oil in the annular cavity can flow into the second cavity.

2. A single-body vibration isolator stiffness testing device according to claim 1, characterized in that: The first cavity and the second cavity are located on both sides of the axis of the piston rod.

3. A single-body vibration isolator stiffness testing device according to claim 1, characterized in that: In the initial state, the first cavity is filled with hydraulic oil, the second cavity is not filled with hydraulic oil, and the annular cavity is not fully filled with hydraulic oil.

4. A single-body vibration isolator stiffness testing device according to claim 1, characterized in that: A step is provided on the circumferential surface of the piston rod, and the two sliding rings are slidably arranged on the step; there are two adjusting parts, each adjusting part corresponds to a sealing ring, and each adjusting part includes a sealing plate, a retaining ring, a connecting block and a power part. The sealing plate is sleeved on the piston rod, and the sealing plate abuts against the end surface of the step. The sealing plate is slidably connected to the sliding ring. An annular groove and a plurality of sliding grooves are provided on the end surface of the step. The retaining ring is slidably arranged in the annular groove along the axial direction of the piston rod, and the sealing plate is connected to the annular groove. The plurality of sliding grooves are evenly arranged around the circumferential surface of the annular groove, and the sliding groove is away from the piston rod relative to the annular groove. Axis, each slide groove is connected with the annular groove, and the slide groove penetrates the circumference of the piston rod along the radial direction of the piston rod, and a plurality of connecting blocks are provided, each connecting block is slidably set in one of the slide grooves, and the connecting blocks are respectively connected with the sliding ring and the retaining ring; the sealing plate, the sliding ring, the connecting block and the retaining ring jointly separate the slide groove and the annular groove into a second cavity and a third cavity which are closed and have variable volumes, the second cavity and the third cavity are located on both sides of the retaining ring in the axial direction of the piston rod, and the power member is arranged in the second cavity and the third cavity, and is used to push the retaining ring to slide along the axial direction of the piston rod.

5. A single-body vibration isolator stiffness testing device according to claim 4, characterized in that: The power part includes a first flow channel, a second flow channel and an oil supply tank. The first flow channel and the second flow channel are both opened inside the piston rod, and one end of the first flow channel is connected to the second cavity, and one end of the second flow channel is connected to the third cavity. The oil supply tank is arranged outside the cylinder body, and one end of the first flow channel away from the second cavity and one end of the second flow channel away from the third cavity both pass through the part of the piston rod located outside the cylinder body and are connected to the oil supply tank.

6. A single-body vibration isolator stiffness testing device according to claim 4, characterized in that: The size of the sealing plate in the radial direction of the piston rod is greater than the distance from the sliding connection position between the sliding ring and the sealing plate to the axis of the piston rod. A receiving groove is provided on the side of the sealing plate close to the corresponding sliding ring, and the end of the sliding ring close to the corresponding sealing plate is slidably arranged in the receiving groove.

7. A single-body vibration isolator stiffness testing device according to claim 4, characterized in that: A spacing is arranged between each sealing plate and the corresponding sealing ring.

8. The rigidity testing device for a single vibration isolator according to claim 1, characterized in that: The first cavity is filled with liquid.

9. The rigidity testing device for a single vibration isolator according to claim 1, characterized in that: The clamping mechanism includes a fixed seat, a slide plate and an extrusion seat. The fixed seat is fixedly installed on the frame. The slide plate is slidably arranged on the fixed seat along the axial direction of the piston rod, and the slide plate is fixedly connected to the piston rod. The extrusion seat is slidably arranged on the frame along a first direction, and the first direction is perpendicular to the axial direction of the piston rod. The single vibration isolator is placed between the extrusion seat and the slide plate.

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