A control arm bush fatigue detection apparatus

Abstract

This invention relates to the field of bushing testing technology and discloses a fatigue testing device for control arm bushings. The device includes a support base and a mounting housing fixed above it. A connecting housing is fixed to the outer wall of the middle portion of the support base. A lead screw is rotatably mounted inside the connecting housing, with one end of the lead screw passing through the connecting housing and fixed to the drive shaft of a drive motor. The drive motor is fixedly mounted on one side of the outer wall of the connecting housing. The device also includes a slide block threaded to the lead screw and slidably assembled inside the connecting housing. One end of a connecting spring is fixed to the outer wall of the slide block, and the other end of the connecting spring is fixed to a holding housing located above the connecting housing. By utilizing the holding housing and the through-slot, the holding housing contacts the mounting housing during bushing loading and unloading, thus ensuring the bushing enters the mounting housing normally while preventing air flow between the inside and outside of the mounting housing, which could lead to the loss of low-temperature gas, increasing energy consumption and reducing testing efficiency during the testing process.

Description

Technical Field

[0001] This invention relates to the field of bushing testing technology, specifically to a fatigue testing device for control arm bushings. Background Technology

[0002] The control arm bushing is a crucial rubber-metal component in a car's suspension system. Although small, it directly affects chassis comfort, handling stability, and driving safety. It reduces vehicle vibration and noise by cushioning and absorbing impacts from the road surface. The control arm bushing consists of an inner sleeve, an outer sleeve, and a buffer rubber layer in between.

[0003] During the testing of control arm bushings, fatigue testing equipment is used to perform fatigue tests on the control arm bushings. In order to improve the extreme performance of the control arm bushings, the control arm bushings are tested at low temperatures. During the loading and unloading process of the bushings, it is often necessary to manually open the testing door to carry out the loading and unloading operations. At this time, the gas in the testing space will be rapidly exchanged with the outside gas, resulting in a large amount of cold air loss. Subsequent tests require a long cooling time, which reduces testing efficiency and increases energy consumption.

[0004] In response to the existing problems, there is an urgent need to innovate on the existing basis. Summary of the Invention

[0005] The purpose of this invention is to provide a fatigue testing device for control arm bushings, in order to solve the problem mentioned in the background art. In the process of testing control arm bushings, fatigue testing equipment is used to test the fatigue performance of control arm bushings. In order to improve the extreme performance of control arm bushings, the control arm bushings are tested at low temperatures. During the loading and unloading of bushings, it is often necessary to manually open the testing door to carry out the loading and unloading operations. At this time, the gas in the testing space will be rapidly exchanged with the outside gas, resulting in a large amount of cold air loss. Subsequent tests require a long cooling time, which reduces the testing efficiency and increases energy consumption.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fatigue testing device for control arm bushings, comprising a support base and a mounting housing fixed above it, a connecting housing fixed to the outer wall of the middle portion of the support base, a lead screw rotatably mounted inside the connecting housing, one end of the lead screw passing through the connecting housing and fixed to the drive shaft of a drive motor, the drive motor being fixedly mounted on one side of the outer wall of the connecting housing; further comprising: A slide block is threaded onto a lead screw and slidably assembled inside a connecting housing. One end of a docking spring is fixed to the outer wall of the slide block, and the other end of the docking spring is fixed to a holding housing located above the connecting housing. A storage cavity is formed inside the holding shell. One end of a piston is slidably installed inside the storage cavity. The other end of the piston passes through the holding shell and is fixed to a slide block. A connecting cavity is also formed inside the holding shell. The connecting cavity is connected to the storage cavity through a connecting pipe formed inside the holding shell. A sliding rod is installed inside the connecting cavity. One end of the sliding rod passes through the holding shell and is fixedly connected to a top plate located above the holding shell. A through groove is formed on the side of the mounting housing, and a sealing plate for blocking the flow of gas inside and outside the mounting housing is installed inside the through groove.

[0007] As an optional solution of the control arm bushing fatigue detection device of the present invention, wherein: a storage shell is fixed to the inner wall of one end of the storage cavity, an air chamber is opened inside the storage shell, a push block with one end extending outside the storage shell is installed inside the air chamber, an air pipe is opened inside the holding shell, and the storage shell is connected to an air bladder installed inside the holding shell through the air pipe. When the piston pushes the push block to squeeze the gas stored in the air chamber, the gas is allowed to enter the air bladder through the air pipe and the air bladder is inflated.

[0008] As an optional solution of the control arm bushing fatigue detection device of the present invention, the airbag has a cross-section with a square-shaped structure. In its initial state, the outer surface protrudes outside the housing. The mounting housing has a square-shaped slot larger than the cross-section of the airbag.

[0009] As an optional solution of the control arm bushing fatigue detection device of the present invention, a reset spring is also installed inside the storage cavity, one end of the reset spring is fixed to the push block, and the other end is fixed to the inner wall of the storage shell.

[0010] As an optional embodiment of the control arm bushing fatigue testing device of the present invention, a connecting spring is installed inside the connecting cavity, and the connecting spring is sleeved on the outside of the slide rod.

[0011] As an optional solution of the control arm bushing fatigue testing device of the present invention, the interior of the housing is provided with a through hole, and a locking rod with one end extending into the storage cavity is slidably installed in the through hole. The other end of the locking rod is embedded in a slide rail fixed to one side of the outer wall of the housing.

[0012] As an optional solution of the control arm bushing fatigue testing device of the present invention, wherein: a locking head and a compression spring are installed inside one end of the locking rod that extends into the storage cavity, one end of the locking head extends out of the locking rod, and the other end is fixedly connected to the compression spring, and a slot adapted to the locking head is opened on the piston, so that when the locking head is inserted into the slot on the piston, the relative position between the holding shell and the slide is locked.

[0013] As an optional solution of the control arm bushing fatigue detection device of the present invention, the top end of the locking head is provided with a conical platform, and the conical platform at the top end of the locking head initially contacts the piston.

[0014] As an optional solution of the control arm bushing fatigue detection device of the present invention, the slide rail includes a lifting section and a smoothing section, the lowest point of the lifting section is lower than the lowest point of the smoothing section, and when the locking rod slides from the smoothing section into the lifting section, the locking rod slides along its axial direction.

[0015] As an optional solution of the control arm bushing fatigue testing device of the present invention, a positioning spring is also provided in the through groove, one end of the positioning spring is fixed to the through groove, and the other end is fixed to the inner wall of the mounting housing. A protruding block that abuts against the top plate is fixed to the outer wall of the sealing plate facing the inner cavity of the housing. A testing mechanism for bushing testing is installed on the inner side of the mounting housing.

[0016] The present invention has the following beneficial effects:

[0017] 1. The fatigue testing equipment for control arm bushings utilizes the design of the holding shell and the through groove to ensure that the holding shell contacts the mounting shell during the bushing loading and unloading process. This allows the bushing to enter the mounting shell normally while preventing air flow inside and outside the mounting shell, which could lead to the loss of low-temperature gas, increase energy consumption during testing, and reduce testing efficiency.

[0018] 2. The fatigue testing equipment for the control arm bushing utilizes an airbag. When the holding shell comes into contact with the mounting shell, the airbag expands, thereby reducing the sealing between the holding shell and the mounting shell and preventing the flow of gas between the inside and outside of the mounting shell.

[0019] 3. The fatigue testing equipment for the control arm bushing uses a locking head and a bayonet to ensure a stable distance between the holding shell and the slide when the holding shell moves with the bushing. This prevents the docking spring from changing its initial position due to repeated loading and unloading, which could affect the subsequent removal of the bushing from the holding shell. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a schematic cross-sectional view of the mounting housing structure of the present invention.

[0022] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0023] Figure 4This is a schematic diagram of the connection structure between the slide and the housing of the present invention.

[0024] Figure 5 This is a schematic cross-sectional view of the container shell of the present invention.

[0025] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B.

[0026] Figure 7 For the present invention Figure 5 Enlarged structural diagram at point C.

[0027] Figure 8 For the present invention Figure 2 Enlarged structural diagram at point D.

[0028] Figure 9 This is a side view of the mounting housing structure of the present invention.

[0029] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point E in the middle.

[0030] In the diagram: 1. Mounting housing; 2. Support seat; 3. Detection mechanism; 4. Connecting housing; 5. Drive motor; 6. Lead screw; 7. Slide seat; 8. Connecting spring; 9. Container housing; 10. Piston; 11. Slide rail; 1101. Lifting section; 1102. Smoothing section; 12. Bayonet; 13. Locking rod; 14. Compression spring; 15. Locking head; 16. Storage cavity; 17. Storage housing; 18. Air cavity; 19. Return spring; 20. Push block; 21. Air pipe; 22. Airbag; 23. Connecting pipe; 24. Connecting cavity; 25. Slide rod; 26. Connecting spring; 27. Top plate; 28. Through groove; 29. ​​Sealing plate; 30. Protruding block; 31. Positioning spring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1, please refer to Figures 1 to 10A fatigue testing device for control arm bushings includes a support 2 and a mounting housing 1 fixed above it. A connecting housing 4 is fixed to the outer wall of the middle part of the support 2. A lead screw 6 is rotatably installed inside the connecting housing 4, and one end of the lead screw 6 passes through the connecting housing 4 and is fixed to the drive shaft of a drive motor 5. The drive motor 5 is fixedly installed on one side of the outer wall of the connecting housing 4. The device also includes a slide 7, which is threaded to the lead screw 6 and slidably assembled inside the connecting housing 4. One end of a docking spring 8 is fixed to the outer wall of the slide 7, and the other end of the docking spring 8 is fixed to a holding housing 9 located above the connecting housing 4. Storage cavity 16 is located inside the housing 9. One end of piston 10 is slidably mounted inside storage cavity 16, and the other end of piston 10 passes through housing 9 and is fixed to slide block 7. A connecting cavity 24 is also located inside housing 9. Connecting cavity 24 and storage cavity 16 are connected via connecting pipe 23 located inside housing 9. A slide rod 25 is installed inside connecting cavity 24, and one end of slide rod 25 passes through housing 9 and is fixedly connected to top plate 27 located above housing 9. A through groove 28 is located in the mounting housing 1. On the side, a sealing plate 29 for sealing the gas flow inside and outside the mounting housing 1 is installed inside the through groove 28. A positioning spring 31 is also provided inside the through groove 28. One end of the positioning spring 31 is fixed to the through groove 28, and the other end is fixed to the inner wall of the mounting housing 1. A protruding block 30 that abuts against the top plate 27 is fixed to the outer wall of the sealing plate 29 facing the inner cavity of the housing 9. A detection mechanism 3 for bushing detection is installed inside the mounting housing 1. A connecting spring 26 is installed inside the connecting cavity 24. The connecting spring 26 is sleeved on the outside of the slide rod 25. The observation glass on the mounting housing 1 allows operators to easily observe the internal conditions of the mounting housing 1. The mounting housing 1 also contains a refrigeration device for controlling temperature rise and fall (not shown in the figure). This is prior art, and those skilled in the art can select it according to actual needs. When the bushing needs to be fed, the drive motor 5 is controlled to rotate. The drive motor 5, which is fixed on the connecting housing 4, rotates. The drive shaft of the drive motor 5 is fixed to the lead screw 6, which in turn drives the lead screw 6 to rotate inside the connecting housing 4. The lead screw 6 is threadedly connected to the slide 7. When the lead screw 6 rotates, it drives the slide 7 to slide on the connecting housing 4. The slide 7 is connected to the holding housing 9 through the docking spring 8. The holding housing 9 is used to store the bushing to be tested. When the slide 7 moves, it will drive the holding housing 9 to move simultaneously. A piston 10 is also provided between the holding housing 9 and the slide 7. The piston 10 and the docking spring 8 are symmetrically arranged. The symmetrical arrangement of the piston 10 and the docking spring 8 ensures the stability of the holding housing 9 during movement and prevents the holding housing 9 from swaying. As the slide block 7 drives the container housing 9 to move, when the container housing 9 contacts the inner wall of the mounting housing 1 where the through groove 28 is provided, the opening of the container housing 9 at the air bladder 22 aligns with the through groove 28. As the lead screw 6 continues to rotate, it drives the slide block 7 to continue moving closer to the inner wall of the mounting housing 1. At this point, because the container housing 9 is in contact with the inner wall of the mounting housing 1, it cannot move further. The slide block 7 will compress the docking spring 8 and reduce the gap between the slide block 7 and the container housing 9. As the slide block 7 gradually approaches the container housing 9, the piston 10 fixed on the slide block 7 will gradually slide into the storage compartment inside the container housing 9. The piston 10 slides into the storage chamber 16, which contains hydraulic oil. As the piston 10 moves within the storage chamber 16, it compresses the hydraulic oil and allows it to flow into the connecting chamber 24 through the connecting pipe 23. As the hydraulic oil in the connecting chamber 24 gradually increases, it drives the slide rod 25 to slide upward, moving away from the connecting pipe 23. The end of the slide rod 25 extending out of the holding housing 9 is fixed with a top plate 27. When the slide rod 25 is in the initial state without moving upward, the top plate 27 is located at the bottom of the protruding block 30, that is, the side of the protruding block 30 close to the holding housing 9. When the subsequent slide bar 25 drives the top plate 27 to move upward, the top plate 27 will contact the protruding block 30 and drive the protruding block 30 to move synchronously. The protruding block 30 and the sealing plate 29 are integrated. When the protruding block 30 moves upward, it will drive the sealing plate 29 to slide synchronously in the through groove 28 and gradually open the through groove 28, so that the internal and external communication channel of the mounting housing 1 is opened. Since the holding housing 9 is attached to the inside of the mounting housing 1, the cold air inside the mounting housing 1 cannot quickly exchange with the air outside the mounting housing 1 due to the obstruction of the holding housing 9. This reduces the loss of cold air when the sealing plate 29 opens the through groove 28. At this time, the bushing to be tested can be placed into the inside of the holding housing 9 through the through groove 28 to feed the bushing into the inside of the mounting housing 1. This also avoids the situation where the temperature inside the mounting housing 1 changes drastically due to the rapid flow and exchange of gas inside the mounting housing 1 during the feeding process, which would increase energy consumption. Subsequently, the drive motor 5 drives the lead screw 6 to rotate in the opposite direction, causing the slide block 7 and the holding shell 9 to reset, and moving the holding shell 9 to the middle of the mounting shell 1, that is, at the symmetrical central axis of the mounting shell 1. At this time, the internally installed robot arm removes the bushing inside the holding shell 9 and places it on the detection mechanism 3. The detection mechanism 3 is used to perform fatigue testing on the bushing. The connecting spring 26 is sleeved on the outside of the connecting spring 26. The connecting spring 26 is located inside the connecting cavity 24 and is connected to the bottom outer wall of the slide rod 25. When the slide rod 25 slides upward, it will compress the connecting spring 26 simultaneously, so that the slide rod 25 can be quickly reset by using the compressed connecting spring 26.

[0033] Example 2 is an improvement on Example 1, designed to solve the problem of sealing the contact between the container housing 9 and the mounting housing 1. For details, please refer to [link / reference needed]. Figures 1 to 10 A storage shell 17 is fixed to the inner wall of one end of the storage cavity 16. An air cavity 18 is opened inside the storage shell 17. A push block 20 with one end extending out of the storage shell 17 is installed inside the air cavity 18. An air pipe 21 is opened inside the holding shell 9. The storage shell 17 is connected to an air bladder 22 installed inside the holding shell 9 through the air pipe 21. When the piston 10 pushes the push block 20 to squeeze the gas stored in the air cavity 18, the gas is allowed to enter the air bladder 22 through the air pipe 21 and the air bladder 22 is inflated. The longitudinal section of the air bladder 22 is set with a U-shaped structure. In its initial state, its outer surface protrudes outside the holding shell 9. The mounting shell 1 has a U-shaped slot larger than the longitudinal section of the air bladder 22. A return spring 19 is also installed inside the storage cavity 16. One end of the return spring 19 is fixed to the push block 20, and the other end is fixed to the inner wall of the storage shell 17. As the piston 10 gradually penetrates deeper into the storage cavity 16, it comes into contact with the push block 20. As the piston 10 continues to penetrate deeper into the storage cavity 16, it will simultaneously drive the push block 20 to move. As the push block 20 gradually penetrates deeper into the air cavity 18, it will compress the gas stored in the air cavity 18 and allow the gas to enter the airbag 22 through the air tube 21. Since the airbag 22 initially protrudes slightly from the outside of the housing 9, and the mounting housing 1 has an opening-shaped groove, the protruding part of the airbag 22 will be embedded in the opening-shaped groove. The protruding airbag 22 is used to increase the sealing between the housing 9 and the mounting housing 1, reducing the possibility of gas inside the mounting housing 1 flowing out from the gap between the housing 9 and the mounting housing 1 to the outside of the mounting housing 1. As gas gradually enters the airbag 22, it inflates, further improving the sealing between the housing 9 and the mounting housing 1. Simultaneously, as the pushing block 20 delves into the air cavity 18, it compresses the return spring 19. The return spring 19 facilitates the subsequent reset of the pushing block 20. The air cavity 18 on the side of the pushing block 20 away from the return spring 19 is connected to the outside via a pre-drilled pressure relief hole on the storage housing 17—the outside of the housing 9 and the inside of the mounting housing 1. During this process, no negative pressure is generated in the air cavity 18 on the side of the pushing block 20 away from the return spring 19. Furthermore, the connection between the pushing block 20 and the storage housing 17 is sealed with packing to prevent hydraulic oil from the storage cavity 16 from entering the air cavity 18 within the storage housing 17. Those skilled in the art can select the sealing method according to actual needs.

[0034] Example 3 is an improvement upon Example 1, addressing the issue of instability during the repositioning of the housing 9, which hinders subsequent bushing removal. For details, please refer to [link to example]. Figures 1 to 10 The interior of the housing 9 has a through hole, and a locking rod 13 is slidably installed in the through hole, with one end extending into the storage cavity 16. The other end of the locking rod 13 is embedded in the slide rail 11 fixed to one side of the outer wall of the housing 4. The locking rod 13 has a locking head 15 and a compression spring 14 installed inside the end that extends into the storage cavity 16. One end of the locking head 15 extends out of the locking rod 13, and the other end is fixedly connected to the compression spring 14. The piston 10 has a slot 12 that is compatible with the locking head 15. When the locking head 15 is embedded in the slot 12 on the piston 10, the relative position between the housing 9 and the slide 7 is locked. The top of the locking head 15 is a conical platform. In the initial state, the conical platform at the top of the locking head 15 abuts against the piston 10. A positioning spring 31 is also provided in the through groove 28. One end of the positioning spring 31 is fixed to the through groove 28, and the other end is fixed to the inner wall of the mounting housing 1. A protruding block 30 that abuts against the top plate 27 is fixed to the outer wall of the sealing plate 29 facing the inner cavity of the housing 9. A detection mechanism 3 for bushing detection is installed on the inner side of the mounting housing 1.

[0035] When the slide block 7 moves the container housing 9 closer to the through groove 28, it will simultaneously move the locking rod 13 in the through hole of the container housing 9. The locking rod 13 is embedded in the slide rail 11 and slides in the slide rail 11. It should be noted that the docking spring 8 has a large rigidity and requires a large compressive force to compress and deform it. The frictional resistance generated by the locking rod 13 sliding in the slide rail 11 is much less than the pressure required to deform the docking spring 8. That is, at this time, the distance between the slide block 7 and the container housing 9 can still be kept relatively stable. As the holding housing 9 comes into contact with the inner wall of the mounting housing 1, and the piston 10 gradually penetrates deeper into the storage cavity 16, the latch 12 on the piston 10 moves synchronously. When the top plate 27 contacts the protruding block 30 and moves the sealing plate 29 upward to its maximum height, the latch 12 on the piston 10 slides into the storage cavity 16 and is positioned directly above the locking head 15. In the initial state, the locking head 15 is resisted by the piston 10, causing a large portion of the locking head 15 to be located inside the locking rod 13, simultaneously compressing the compression spring 14. That is, the compression spring 14 is initially in a compressed state. When the latch 12 is directly above the locking head 15, the return force of the compressed spring 14 pushes the locking head 15 upward. The locking head 15 engages with the slot 12 to lock the position of the piston 10. When the container housing 9 is reset, the locking head 15 engages with the slot 12 to lock the piston 10. At this time, the relative position between the container housing 9 and the slide 7 remains stable and will not reset as the container housing 9 gradually separates from the mounting housing 1. This setting transforms the soft connection between the slide 7 and the container housing 9 into a stable hard connection, ensuring the stability of the internal bushing when the container housing 9 resets. It also effectively avoids the change in the distance between the slide 7 and the container housing 9 when the docking spring 8 returns to its initial state due to repeated compression of the docking spring 8, which would cause some inconvenience for the robotic arm to remove the bushing from the container housing 9 later. During the reset process of the housing 9, the locking rod 13 will slide inside the smooth section 1102. When the housing 9 moves to the middle position of the housing 1, that is, the position where the robotic arm picks up the material, the locking rod 13 is still inside the smooth section 1102. When the robotic arm takes out the bushing from the housing 9, the control screw 6 continues to rotate, allowing the slide 7 to drive the housing 9 to continue moving, and finally allowing the locking rod 13 to slide from the smooth section 1102 into the lifting section 1101, allowing the locking rod 13 to move downward along the axis, that is, allowing the locking rod 13 to gradually slide out of the storage cavity 16. As the locking rod 13 gradually slides out of the storage cavity 16, the pressure on the locking head 15 gradually decreases, and the locking head 15 finally slides out of the bayonet 12, releasing the lock on the piston 10. At this time, the compressed docking spring 8 will quickly reset and drive the piston 10 to reset, allowing the inflated airbag 22 and the top plate 27 to complete the reset movement. When the bayonet 12 and the locking head 15 are not separated, and the holding housing 9 is still in contact with the mounting housing 1, when the slide 7 drives the holding housing 9 to reset, the top plate 27 will slide relative to the protruding block 30, and eventually the top plate 27 will separate from the protruding block 30. When the protruding block 30 is released from support, the positioning spring 31, which is compressed by the upward movement of the protruding block 30, will quickly reset and drive the protruding block 30 to move downward quickly, thus completing the sealing of the through groove 28. Since the airbag 22 is in an inflated state, the inflated airbag 22 effectively reduces the gap that occurs during the separation of the holding housing 9 and the mounting housing 1, reduces the flow of internal and external air, and thus reduces energy consumption.

[0036] It should also be noted that when the connecting spring 26 and the positioning spring 31 are reset to their maximum positions, that is, when the slide rod 25 and the sealing plate 29 are moved to their lowest positions, the connecting spring 26 and the positioning spring 31 are still in a state of not being fully reset. In this way, their service life is extended and the situation of not being able to be fully reset is avoided. The top of the locking head 15 is set with a conical platform, which makes it easy for it to slide smoothly into the bayonet 12.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fatigue testing device for control arm bushings, comprising a support (2) and a mounting housing (1) fixed above it, wherein a connecting housing (4) is fixed to the outer wall of the middle part of the support (2), and a lead screw (6) is rotatably installed inside the connecting housing (4), and one end of the lead screw (6) passes through the connecting housing (4) and is fixed to the drive shaft of a drive motor (5), wherein the drive motor (5) is fixedly installed on one side of the outer wall of the connecting housing (4); Its features are, Also includes: The slide (7) is threaded to the lead screw (6) and slidably assembled in the connecting housing (4). One end of the docking spring (8) is fixed to the outer wall of the slide (7), and the other end of the docking spring (8) is fixed to the holding housing (9) located above the connecting housing (4). Storage cavity (16) is opened inside the holding shell (9). One end of piston (10) is slidably installed inside the storage cavity (16). The other end of piston (10) passes through the holding shell (9) and is fixed to slide block (7). A connecting cavity (24) is also opened inside the holding shell (9). The connecting cavity (24) and storage cavity (16) are connected by a connecting pipe (23) opened inside the holding shell (9). A slide rod (25) is installed inside the connecting cavity (24). One end of slide rod (25) passes through the holding shell (9) and is fixedly connected to the top plate (27) located above the holding shell (9). A through groove (28) is provided on the side of the mounting housing (1), and a sealing plate (29) for blocking the gas flow inside and outside the mounting housing (1) is installed inside the through groove (28).

2. The fatigue testing equipment for control arm bushings according to claim 1, characterized in that: A storage shell (17) is fixed to the inner wall of one end of the storage cavity (16). An air chamber (18) is opened inside the storage shell (17). A push block (20) with one end extending outside the storage shell (17) is installed inside the air chamber (18). An air pipe (21) is opened inside the holding shell (9). The storage shell (17) is connected to an air bladder (22) installed inside the holding shell (9) through the air pipe (21). When the piston (10) pushes the push block (20) to squeeze the gas stored in the air chamber (18), the gas enters the air bladder (22) through the air pipe (21) and the air bladder (22) inflates.

3. The fatigue testing equipment for control arm bushings according to claim 2, characterized in that: The airbag (22) has a cross-section with a square-shaped structure. In its initial state, its outer surface protrudes outside the housing (9). The mounting housing (1) has a square-shaped slot larger than the cross-section of the airbag (22).

4. The fatigue testing equipment for control arm bushings according to claim 3, characterized in that: A reset spring (19) is also installed inside the storage cavity (16). One end of the reset spring (19) is fixed to the push block (20), and the other end is fixed to the inner wall of the storage shell (17).

5. The fatigue testing equipment for control arm bushings according to claim 1, characterized in that: A connecting spring (26) is installed inside the connecting cavity (24), and the connecting spring (26) is sleeved on the outside of the slide rod (25).

6. The fatigue testing equipment for control arm bushings according to claim 1, characterized in that: The interior of the housing (9) has a through hole, and a locking rod (13) with one end extending into the storage cavity (16) is slidably installed in the through hole. The other end of the locking rod (13) is embedded in a slide rail (11) that is fixed to one side of the outer wall of the housing (4).

7. The fatigue testing equipment for control arm bushings according to claim 6, characterized in that: The locking rod (13) has a locking head (15) and a compression spring (14) installed inside one end of the locking rod (13) that extends into the storage cavity (16). One end of the locking head (15) extends out of the locking rod (13), and the other end is fixedly connected to the compression spring (14). The piston (10) has a slot (12) that is compatible with the locking head (15). When the locking head (15) is inserted into the slot (12) on the piston (10), the relative position between the housing (9) and the slide (7) is locked.

8. The fatigue testing equipment for control arm bushings according to claim 7, characterized in that: The top of the locking head (15) is a conical platform, and the conical platform at the top of the locking head (15) initially contacts the piston (10).

9. The fatigue testing equipment for control arm bushings according to claim 6, characterized in that: The slide rail (11) includes a lifting section (1101) and a smooth section (1102). The lowest point of the lifting section (1101) is lower than the lowest point of the smooth section (1102). When the locking rod (13) slides from the smooth section (1102) into the lifting section (1101), the locking rod (13) slides along its axial direction.

10. The fatigue testing equipment for control arm bushings according to claim 1, characterized in that: A positioning spring (31) is also provided in the through groove (28). One end of the positioning spring (31) is fixed to the through groove (28), and the other end is fixed to the inner wall of the mounting housing (1). A protruding block (30) that abuts against the top plate (27) is fixed on the outer wall of the sealing plate (29) facing the inner cavity of the housing (9). A detection mechanism (3) for bushing detection is installed on the inner side of the mounting housing (1).

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