Single vibration isolator rigidity testing device

Abstract

The invention relates to the technical field of rigidity detection, in particular to a single vibration isolator rigidity testing device which comprises a rack, a cylinder body, a piston rod, a sliding ring and a sealing ring, the rack is fixedly arranged, the cylinder body is fixedly arranged on the rack, one end of the piston rod is arranged in the cylinder body in a sliding mode in the axial direction of the piston rod, and the piston rod is sleeved with the sliding ring; the sliding ring is sleeved with the sealing ring, the sealing ring is made of a flexible material, the two ends of the sealing ring are overturned in the direction close to the sliding ring and fixedly connected with the sliding ring, the sealing ring and the sliding ring define a closed first cavity which extends in the circumferential direction of the piston rod and is adjustable in internal pressure, and the sealing ring makes contact with the inner wall of the cylinder body; the length of the sealing ring in the axial direction of the piston rod is larger than the distance between the two ends of the sealing ring in the axial direction of the piston rod. And the pressure in the first cavity is adjustable, and the contact pressure between the sealing ring and the inner wall of the cylinder body can be changed, so that the sealing effect in the cylinder body is ensured according to different use conditions.

Description

Technical Field

[0001] The invention relates to the technical field of stiffness detection, in particular to a stiffness testing device for a single vibration isolator. Background Art

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

[0003] In the hydraulic system of the compression shear tester, the piston head seal ring is prone to sliding deformation, which in turn increases 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 is worn to a certain extent, it will lead to a decrease in sealing performance, causing hydraulic oil leakage and unstable hydraulic system pressure. The stiffness test of the single vibration isolator requires precise pressure and displacement control. 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 is started, the force between the piston head and the cylinder wall will be too large, which can easily cause oil leakage, reduce system pressure, and affect the performance of the entire hydraulic system. Ultimately, the compression shear tester cannot accurately and stably perform stiffness tests on single vibration isolators. Summary of the invention

[0004] Based on this, it is necessary to provide a single vibration isolator stiffness testing device to address the problem that the hydraulic system is easily unstable and affects the test results when the current compression shear testing machine tests the performance of the single vibration isolator.

[0005] The above purpose is achieved through the following technical solutions: The invention discloses a rigidity testing device for a single vibration isolator, comprising 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 comprises 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 comprises 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 circumferentially around the piston rod and having adjustable internal pressure. The sealing ring contacts the inner wall of the cylinder body, and the length of the sealing ring in the axial direction of the piston rod is greater than the spacing 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.

[0006] 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 direction of the piston rod's advancement, the length of the portion in front of the contact position between the sealing ring and the sliding ring in the axial direction of the piston rod is smaller than the length of the portion in rear of the contact position between the sealing ring and the sliding ring in the axial direction of the piston rod.

[0007] Preferably, two sliding rings and two sealing rings are provided, 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 provided 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 provided in the piston rod, the first cavity and the second cavity can be respectively connected with the annular cavity in one way, 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.

[0008] Preferably, the first cavity and the second cavity are located on both sides of the axis of the piston rod.

[0009] Preferably, in an 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.

[0010] Preferably, a step is provided on the circumferential surface of the piston rod, and the two sliding rings are slidably arranged on the step; two adjusting parts are provided, 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 relative to the annular groove. The axis of the rod, 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. There are multiple connecting blocks, 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 that 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 to push the retaining ring to slide along the axial direction of the piston rod.

[0011] 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 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.

[0012] Preferably, 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, and a receiving groove is provided on the surface 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.

[0013] Preferably, a spacing is provided between each sealing plate and the corresponding sealing ring.

[0014] Preferably, the first cavity is filled with liquid.

[0015] Preferably, the clamping mechanism includes a fixed seat, a slide plate and an extrusion seat, the fixed seat is fixedly mounted 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, the first direction is perpendicular to the axial direction of the piston rod, and the single vibration isolator is placed between the extrusion seat and the slide plate.

[0016] The beneficial effects of the present invention are as follows: the pressure in the first cavity is adjustable, and the contact pressure between the sealing ring and the inner wall of the cylinder body can be changed, so as to ensure the sealing effect inside the cylinder body according to different usage conditions; through the matching arrangement between the sealing ring and the inner wall of the cylinder body and the sliding ring respectively, during the process of the sealing ring rotating and connecting with the inner wall of the cylinder body, the sealing ring can be in rolling contact with the inner wall of the cylinder body, and the contact part thereof is relatively static, thereby shortening the distance that the piston rod slides and drives the sealing ring to slide relative to the inner wall of the cylinder body; when the piston rod detects the single vibration isolator through the clamping mechanism, the reciprocating motion of the piston rod drives the sealing ring to move relative to the inner wall of the cylinder body to reduce the moving distance, thereby reducing the wear of the sealing ring, improving its service life, and increasing the stability of the reciprocating motion of the piston rod; the sliding ring is arranged to slide relative to the piston rod, and 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, thereby reducing the relative sliding distance between the sealing ring and the inner wall of the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of a single vibration isolator stiffness testing device provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of a hydraulic mechanism of a single vibration isolator stiffness testing device provided by an embodiment of the present invention; Figure 3 A split diagram of a hydraulic mechanism of a single vibration isolator stiffness testing device provided by an embodiment of the present invention; Figure 4 A right side view of a hydraulic mechanism of a single vibration isolator stiffness testing device provided by an embodiment of the present invention; Figure 5 for Figure 4 Sectional view along AA direction; Figure 6 for Figure 5 The enlarged view of point B in the middle; Figure 7 for Figure 5 Enlarged view of point C in the middle; Figure 8 A schematic structural diagram of a piston rod of a single-body vibration isolator stiffness testing device provided in an embodiment of the present invention; Fig. 9 A cross-sectional view of a sliding ring of a single-body vibration isolator stiffness testing device provided in an embodiment of the present invention.

[0018] Wherein: 100, frame; 101, cylinder body; 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, containing 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, fixing seat; 402, slide plate; 403, extrusion seat; 404, single vibration isolator. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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 only used to explain the present invention and are not used to limit the present invention.

[0020] 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 order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which 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 therefore cannot be understood as a limitation to the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] like Figures 1 to 9 As shown, an embodiment of the present invention provides a single-body vibration isolator stiffness testing device, including a frame 100, a clamping mechanism and a hydraulic mechanism. The frame 100 is fixedly arranged, and the clamping mechanism is arranged on the frame 100 for clamping the single-body vibration isolator 404. The hydraulic mechanism includes a cylinder body 101, a piston rod 102 and a sealing assembly. The cylinder body 101 is fixedly arranged on the frame 100, and one end of the piston rod 102 is slidably arranged in the cylinder body 101 along its own axial direction. The cylinder body 101 is filled with hydraulic oil, and two oil holes are provided on the cylinder body 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 body 101 through one of the oil holes, and oil is pumped out through the other oil hole. The piston rod 102 can be pushed to slide in its own axial direction through the sealing assembly, and the other end of the piston rod 102 is connected to the clamping mechanism. The sealing assembly comprises a sliding ring 103, a sealing ring 104 and an adjusting portion. The sliding ring 103 is sleeved on the piston rod 102 and 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. The two ends of the sealing ring 104 are flipped toward the direction close to the sliding ring 103 and are fixedly connected to the sliding ring 103 respectively. The sealing ring 104 and the sliding ring 103 form a closed first cavity 105 extending circumferentially around the piston rod 102 and with adjustable internal pressure. The sealing ring 104 contacts the inner wall of the cylinder body 101, and the length of the sealing ring 104 in the axial direction of the piston rod 102 is greater than the distance between the two ends of the sealing ring 104 in the axial direction of the piston rod 102; the adjusting portion is used to control the sliding ring 103 to slide along the axial direction of the piston rod 102.

[0023] 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 in the axial direction of the piston rod 102 are consistent; in the second state, in the direction of the piston rod 102 moving forward, the length of the front part of the contact position between the sealing ring 104 and the sliding ring 103 in the axial direction of the piston rod 102 is smaller than the length of the rear part of the contact position between the sealing ring 104 and the sliding ring 103 in the axial direction of the piston rod 102.

[0024] The pressure in the first cavity 105 is adjustable, which can change the contact pressure between the sealing ring 104 and the inner wall of the cylinder body 101, thereby ensuring the sealing effect inside the cylinder body 101 according to different usage conditions; through the matching arrangement between the sealing ring 104 and the inner wall of the cylinder body 101 and the sliding ring 103 respectively, during the process of the sealing ring 104 and the inner wall of the cylinder body 101 being rotated and connected, the sealing ring 104 can roll in contact with the inner wall of the cylinder body 101, and the contact part thereof is relatively static, which shortens the distance that the piston rod 102 slides and drives the sealing ring 104 to slide relative to the inner wall of the cylinder body 101, and when the piston rod 1 02 When the single vibration isolator 404 is inspected by the clamping mechanism, the reciprocating motion of the piston rod 102 causes the sealing ring 104 to move less relative to the inner wall of the cylinder body 101, thereby reducing the wear of the sealing ring 104, improving its service life, and increasing the stability of the reciprocating motion of the piston rod 102; the sliding ring 103 is arranged to slide relative to the piston rod 102, and 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, thereby reducing the relative sliding distance between the sealing ring 104 and the inner wall of the cylinder body 101.

[0025] In this embodiment, two sliding rings 103 and two sealing rings 104 are provided. The sliding rings 103 are arranged on the piston rod 102 along the axial direction of the piston rod 102. Each sealing ring 104 is arranged on a sliding ring 103. An annular cavity 106 is provided between the two sealing rings 104, and the two sealing rings 104 slide on the piston rod 102 along the axial direction of 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 connected 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 opened on the peripheral surface of the piston rod 102, and the first arc plate 202 is provided on the peripheral surface of the piston rod 102, and the first arc plate 202 covers The cover is on the first groove 201, the first arc plate 202 is located in the annular cavity 106, and 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 valve 203, and the plurality of first one-way valves 203 are evenly distributed on the first arc plate 202 around the circumference of the piston rod 102; the second cavity is composed of a second groove 204 and a second arc plate 205, the second groove 204 is opened on the circumference of the piston rod 102, the second arc plate 205 is arranged on the circumference 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, and 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 valve 206, and the plurality of second one-way valves 206 are evenly distributed on the second arc plate 205 around the circumference of the piston rod 102.

[0026] 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 around the circumferential direction of the piston rod 102 respectively, and 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.

[0027] 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 fully filled with hydraulic oil. After the piston rod 102 slides along its own axial direction, the solidified or deteriorated hydraulic oil acting as an oil film on the sealing ring 104 enters the annular cavity 106, and the two corresponding sealing rings 104 are controlled by the two adjustment parts to approach each other, the volume of the annular cavity 106 decreases, the pressure increases, and the hydraulic oil in the space enters the second cavity through the second one-way valve 206; the two adjustment 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 enters the annular cavity 106 through the first one-way valve 203, reducing the influence of the solidified or deteriorated hydraulic oil on the sealing performance of the sealing ring 104.

[0028] In this embodiment, a step is provided on the circumferential surface of the piston rod 102, and the two sliding rings 103 are 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 part. 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 to the sliding ring 103. An annular groove and a plurality of sliding grooves are provided 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. The sealing plate 207 is connected to the annular groove. The plurality of sliding grooves are evenly arranged around the circumferential surface of the annular groove. The sliding groove is away from the axis of the piston rod 102 relative to the annular groove. Each The slide groove is connected to the annular groove, and the slide groove penetrates the circumferential surface of the piston rod 102 along the radial direction of the piston rod 102. There are multiple connecting blocks 209, each connecting block 209 is slidably set in one of the slide grooves, and the connecting block 209 is respectively connected to 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 separate the slide groove and the annular groove into a closed 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, and the power part is arranged in the second cavity 303 and the third cavity 304, which is used to push the retaining ring 208 to slide along the axial direction of the piston rod 102.

[0029] In this embodiment, the power part includes a first flow channel 305, a second flow channel 306 and an oil supply tank. The first flow channel 305 and the second flow channel 306 are both opened inside the piston rod 102, and one end of the first flow channel 305 is connected to the second cavity 303, and one end of the second flow channel 306 is connected to the third cavity 304. The oil supply tank is arranged outside the cylinder body 101, and one end of the first flow channel 305 away from the second cavity 303 and one end of the second flow channel 306 away from the third cavity 304 both penetrate the part of the piston rod 102 located outside the cylinder body 101 and are connected to the oil supply tank. The oil supply tank can control the flow direction of the hydraulic oil in the first flow channel 305 and the second flow channel 306 respectively, thereby controlling the amount of hydraulic oil in the second cavity 303 and the third cavity 304; the changes in the amount of hydraulic oil in the second cavity 303 and the third cavity 304 are inversely proportional. When the amount of hydraulic oil in the second cavity 303 increases, the amount of hydraulic oil in the third cavity 304 decreases relatively.

[0030] In this embodiment, the dimension of the sealing plate 207 in the radial direction of the piston rod 102 is greater than the distance from the sliding connection position between the sliding ring 103 and the sealing plate 207 to the axis of the piston rod 102. A receiving groove 210 is provided on the side of the sealing plate 207 close to the corresponding sliding ring 103, and one end of the sliding ring 103 close to the corresponding sealing plate 207 is slidably arranged in the receiving groove 210. The coordinated arrangement of the sliding ring 103 and the sealing plate 207 can increase the sealing distance between the second cavity 303 and the interior of the cylinder, thereby relatively improving the sealing effect of the second cavity 303.

[0031] In this embodiment, a distance is provided between each sealing plate 207 and the corresponding sealing ring 104 , so that when the piston rod 102 slides in the cylinder body 101 , the sealing plate 207 will not interfere with the state switching of the sealing ring 104 .

[0032] In this embodiment, the first cavity 105 is filled with liquid, which is less easily compressed than gas, and the internal pressure in the first cavity 105 is more stable. A third flow channel 307 is provided on the sliding ring 103, the connecting block 209 and the retaining ring 208. One end of the third flow channel 307 is connected to the first cavity 105, and one end of the second flow channel 306 is connected to the third cavity 304. A fourth flow channel 308 is provided in the piston rod 102. One end of the fourth flow channel 308 passes through the part of the piston rod 102 located outside the cylinder body 101 and is connected to the oil supply tank. The other end of the fourth flow channel 308 is connected to an end of the third flow channel 307 away from the third cavity 304 through a pipe 302. One end of the pipe 302 is fixedly mounted on a surface of the retaining ring 208 located in the third cavity 304, and the other end of the pipe 302 is slidably arranged in the fourth flow channel 308 along the axial direction of the piston rod 102.

[0033] In this embodiment, the clamping mechanism includes a fixed seat 401, a slide plate 402 and an extrusion seat 403. The fixed seat 401 is fixedly installed on the frame 100. The slide plate 402 is slidably arranged on the fixed seat 401 along the axial direction of the piston rod 102, and the slide plate 402 is fixedly connected to the piston rod 102. The extrusion 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 vibration isolator 404 is placed between the extrusion seat 403 and the slide plate 402, and the first direction is a vertical direction. When the extrusion seat 403 and the slide plate 402 fix the single vibration isolator 404, the hydraulic mechanism can drive the slide plate 402 to move horizontally back and forth to detect the stiffness of the single vibration isolator 404.

[0034] The working principle of the single vibration isolator stiffness testing device provided in the above embodiment is as follows: First, the single vibration isolator 404 to be tested is placed on the slide plate 402, and then the extrusion seat 403 is controlled to move downward and clamp the single vibration isolator 404 together with the slide plate 402, and then hydraulic oil is injected into the cylinder body 101 through one of the oil holes on the cylinder body 101 away from the single vibration isolator 404. The hydraulic oil on the side of the sealing component in the cylinder body 101 away from the single vibration isolator 404 increases, pushing the piston rod 102 to move toward the fixed seat 401, and the piston rod 102 pushes the slide plate 402 to slide on the fixed seat 401, and the slide plate 402 drives one end of the single vibration isolator 404 to perform shearing movement relative to the other end, and the hydraulic oil on the side of the sealing component in the cylinder body 101 close to the single vibration isolator 404 is discharged through the corresponding oil hole.

[0035] When the slide plate 402 drives the single vibration isolator 404 to move a certain distance, the oil inlet and outlet directions of the two oil holes on the control cylinder 101 flow in the opposite direction, the piston rod 102 moves away from the fixed seat 401, and drives the slide plate 402 to slide in the opposite direction on the fixed seat 401, and the slide plate 402 carries the single vibration isolator 404 to perform shearing movement again.

[0036] Before the piston rod 102 slides in the cylinder body 101, the two sealing rings 104 are in the first state, and then the piston rod 102 slides through the retaining ring 208 and the connecting block 209 to drive the sliding ring 103 to slide, and 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 at the front side of the front end of the sealing ring 104 and not in contact with the inside of the cylinder body 101 gradually approaches the inner wall of the cylinder body 101, and the part located behind the sealing ring 104 is moved. The part at the rear end that contacts the inside of the cylinder 101 gradually moves away from the inner wall of the cylinder 101, and the sealing ring 104 that contacts the inner wall of the cylinder 101 is stationary relative to the rod cylinder 101. As the sliding ring 103 moves, the position where the inner wall of the cylinder 101 contacts the sealing ring 104 moves in the direction of the sliding ring 103 until the front part of the front end of the sealing ring 104 can no longer contact the inner wall of the cylinder 101. At this time, the part of the sealing ring 104 that contacts the inner wall of the cylinder 101 slides relative to the inner wall of the cylinder 101. Within the reciprocating sliding range of the piston rod 102, it is ensured that the front part of the front end of the sealing ring 104 can still approach the inside of the cylinder 101, so that the part of the sealing ring 104 that contacts the inner wall of the cylinder 101 will not slide relative to the inner wall of the cylinder 101, reducing the sliding wear of the sealing ring 104.

[0037] Before the piston rod 102 slides, if the sealing ring 104 is not in the first state, hydraulic oil can be first delivered to the first flow channel 305 or the second flow channel 306 through the oil supply tank, and 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, so that the sealing ring 104 is converted to the first state.

[0038] If the single vibration isolator stiffness test device is not used for a long time, the oil film between the sealing ring 104 and the cylinder body 101 is easy to solidify or cause 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 body 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 two retaining rings 208 can be controlled by controlling the oil supply tank to move closer to each other. The two retaining rings 208 drive the corresponding two sealing rings 104 to move closer to each other through the corresponding connecting blocks 209, and the volume of the annular cavity 106 is increased. The pressure in the annular cavity 106 decreases, the second one-way valve 206 opens, and the hydraulic oil in the annular cavity 106 enters the second cavity; then the oil supply tank is controlled to make the two baffle rings 208 move away from each other, and the two baffle 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, and the pressure in the annular cavity 106 decreases, the second one-way valve 206 is closed, and the first one-way valve 203 is opened, and the hydraulic oil in the first cavity enters the annular cavity 106 to complete the replacement, thereby reducing the influence of the solidified oil film on the sealing performance of the sealing ring 104.

[0039] At the moment when the piston rod 102 moves, the pressure inside the cylinder body 101 increases, and the starting load of the piston rod 102 is large. The oil supply 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, thereby increasing the pressure inside the first cavity 105 and improving the sealing performance of the sealing ring 104.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0041] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached 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 direction of the piston rod's advancement, the length of the portion in front of the contact position between the sealing ring and the sliding ring in the axial direction of the piston rod is smaller than the length of the portion in rear of the contact position between the sealing ring and the sliding ring in the axial direction of the piston rod.

2. A single-body vibration isolator stiffness testing device according to claim 1, characterized in that: 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.

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

4. A single-body vibration isolator stiffness testing device according to claim 2, 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.

5. A single-body vibration isolator stiffness testing device according to claim 2, 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.

6. A single-body vibration isolator stiffness testing device according to claim 5, 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.

7. The rigidity testing device for a single vibration isolator according to claim 5, 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.

8. The rigidity testing device for a single vibration isolator according to claim 5, characterized in that: A spacing is arranged between each sealing plate and the corresponding sealing ring.

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

10. 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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