A pneumatic down-pressing structure CCM module test fixture
By using a multi-stage lifting structure and a pneumatic pressure fixture with adjustable spring preload, the problems of impact damage and pressure adjustment difficulties in CCM module testing have been solved, achieving gentle contact and multi-mode testing, and improving the accuracy and safety of testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNSHAN PHOEBE ELECTRONIC TECHNOLOGY CO LTD
- Filing Date
- 2026-05-03
- Publication Date
- 2026-07-24
AI Technical Summary
Existing CCM module testing fixtures lack a buffer mechanism when contacting workpieces, which can easily cause microscopic damage. The single drive stroke makes it difficult to balance rapid approach and gentle contact. Furthermore, the pressure adjustment is cumbersome and cannot flexibly adapt to multiple testing schemes.
The design incorporates a multi-stage lifting structure driven by a cylinder, achieving multi-stage descent of the counterweight seat through a linear lifting mechanism and a contact lifting mechanism. Combined with spring preload adjustment, it provides gentle contact and additional pressure, supporting multiple testing methods.
It enables impact-free gentle contact and multi-segment pressure testing of CCM modules, improving the accuracy and safety of testing and supporting flexible adaptation to different workpieces.
Smart Images
Figure CN122448643A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of testing fixtures for electronic equipment production, specifically to a pneumatically pressurized CCM module testing fixture. Background Technology
[0002] In the production and testing of CCM modules, precise pressure testing is often required to verify their structural strength and electrical performance stability. In existing technologies, some test fixtures apply pressure using the weight of a counterweight or a single cylinder in direct drive. However, such solutions have significant shortcomings: Firstly, the counterweight lacks an effective buffering mechanism when it comes into contact with the workpiece. Rigid impacts can easily cause microscopic damage or functional failure to the precision module, affecting the accuracy of the test and the product yield. Secondly, the drive stroke is usually single-stage, which makes it difficult to meet the different motion requirements of quickly approaching the workpiece and gently contacting the workpiece, resulting in a failure to unify test efficiency and safety. Third, when faced with test scenarios that require additional controllable pre-pressure, traditional structures often rely on adding or removing counterweights, which is cumbersome to operate and the pressure value is difficult to adjust steplessly, making it impossible to flexibly adapt to multiple testing schemes. Therefore, there is an urgent need to design a test fixture with a multi-segment pneumatic pressure structure to solve the problems of high impact damage risk, inaccurate motion control, and difficulty in pressure regulation in the existing technology. Summary of the Invention
[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a pneumatic pressure structure CCM module test fixture. This fixture utilizes a multi-stage lifting structure driven by a cylinder to achieve multi-stage descent of the counterweight, thereby ensuring that the counterweight makes gentle contact with the workpiece without causing impact damage. It can also provide additional pressure according to testing requirements to achieve multiple testing methods for the workpiece.
[0004] To achieve the above objectives, the present invention adopts the following technical solutions: It includes a lifting platform and a counterweight platform, wherein the counterweight platform is configured to work in conjunction with the lifting platform. It also includes: The frame is positioned above the lifting platform; Mounting frame, wherein the mounting frame is installed inside the machine frame and the lifting seat is installed on the mounting frame; A linear lifting mechanism is mounted on a mounting frame and is configured to cooperate with a lifting base. The contact lifting mechanism is mounted on the linear lifting mechanism and is configured to cooperate with the lifting seat. The linear lifting mechanism drives the contact lifting mechanism and the lifting seat to move synchronously, thereby driving the counterweight seat to move quickly and approach the workpiece. The contact lifting mechanism then drives the lifting seat to move, thereby driving the counterweight seat to move slowly and contact the workpiece. The counterweight seat is then placed against the workpiece to achieve pressure testing.
[0005] Preferably, the linear lifting mechanism comprises: The lifting frame is installed inside the mounting frame, and the lifting seat is movably installed inside the lifting frame. The linear lifting slide rail consists of two rails, which are symmetrically fixedly installed on the front and rear inner walls of the mounting frame. The linear lifting slider consists of two linear lifting sliders that are symmetrically fixed on the front and rear side walls of the lifting frame, and the linear lifting sliders are slidably mounted on the linear lifting slide rail. A linear lifting cylinder is fixedly mounted on the top plate of the mounting frame, and the output end of the linear lifting cylinder is fixedly mounted on the lifting frame.
[0006] Preferably, the contact lifting mechanism comprises: The guide frame is slidably disposed inside the lifting frame and is movably mounted outside the lifting seat; The guide pin has a guide groove on the inner wall of the guide frame, and the guide pin is fixedly set on the outer wall of the lifting seat and is movably inserted into the guide groove. The contact lifting cylinder is fixedly mounted on the lifting frame, and its output end is fixedly mounted on the guide frame.
[0007] Preferably, the lower end of the lifting seat is fixedly provided with an installation compartment, and an installation base is movably arranged inside the installation compartment, with a counterweight seat arranged on the installation base.
[0008] Preferably, a spline rod is fixedly provided on the mounting base, and the spline rod is movably inserted through the top plate of the mounting compartment. A connecting seat is fixedly provided at the upper end of the spline rod, and the connecting seat is located inside the lifting base.
[0009] Preferably, a connecting rod is fixedly provided on the connecting seat, the connecting rod is movably inserted through the partition plate inside the lifting seat, a limiting plate is movably sleeved on the connecting rod, a limiting rod is fixedly provided on the limiting plate, and the limiting rod is movably inserted through the partition plate inside the lifting seat, a limiting block is fixedly provided at the upper end of the limiting rod, and the limiting block is movably abutted against the upper surface of the partition plate inside the lifting seat, a spring is sleeved on the connecting rod, and the spring is clamped between the limiting plate and the partition plate inside the lifting seat.
[0010] Preferably, an internal threaded sleeve is fixedly inserted through the partition plate inside the lifting seat, and an external threaded sleeve is threadedly inserted through the internal threaded sleeve. The upper end of the connecting rod is inserted into the lower port of the external threaded sleeve. A support plate is sleeved on the connecting rod, and the two ends of the support plate are respectively movably locked onto the limiting rods on both sides. The upper end of the spring abuts against the support plate, the lower end of the spring abuts against the limiting plate, and the support plate abuts against the lower end of the external threaded sleeve.
[0011] Preferably, a pressure-bearing lifting slide rail is fixedly installed on the frame, a pressure-bearing lifting slider is fixedly installed on the mounting frame, and the pressure-bearing lifting slider is slidably mounted on the pressure-bearing lifting slide rail. A guide rod is fixedly installed on the frame, a guide seat is movably sleeved on the guide rod, a connecting arm is spun on the guide seat via a rotating shaft, and the movable end of the connecting arm is spun on the mounting frame via a rotating shaft. A pressure-bearing lifting cylinder is fixedly installed on the frame, and the output end of the pressure-bearing lifting cylinder is fixedly installed on the guide seat.
[0012] Preferably, a limiting sleeve is screwed into the mounting base via a rotating shaft, a limiting seat is fixedly installed on the counterweight base, and the limiting seat is inserted into the limiting sleeve after passing through the bottom plate of the mounting base. The limiting sleeve has a slot with a single-end opening, and a locking block is fixedly installed on the limiting seat, and the locking block is movably inserted into the slot. An internal hexagonal sleeve is screwed onto the mounting base via a bearing, a main gear is fixedly installed on the internal hexagonal sleeve, and a secondary gear is fitted and fixedly installed on the limiting sleeve. The main gear and the secondary gear are meshed with each other.
[0013] Compared with the prior art, the beneficial effects of the present invention are: This solution achieves three-stage limited movement of the lifting seat through the cooperation of the frame, mounting frame, and lifting frame. This enables the counterweight seat to be pressed onto the workpiece through three-stage cylinder drive, thus achieving pressure testing of the workpiece and effective impact protection for the workpiece when lowering the counterweight seat. This solution uses the cooperation of the limiting sleeve and the limiting seat to connect and install the counterweight seat and the mounting seat, thereby enabling the counterweight seat to be replaced and disassembled. Pressure tests have been conducted on different types of workpieces. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 The right front side view; Figure 3 yes Figure 1 The lower right side view; Figure 4 This is a schematic diagram of the structure of the frame, mounting bracket, and guide seat in this invention; Figure 5 This is a structural schematic diagram of the lifting frame, lifting seat, and guide frame in this invention; Figure 6 This is a schematic diagram of the guide frame and the contact lifting cylinder in this invention; Figure 7 This is a schematic diagram of the lifting seat, mounting compartment, and external threaded sleeve in this invention; Figure 8 This is a schematic diagram of the structure of the spline rod, connecting rod, limiting plate, and support plate in this invention; Figure 9 This is a schematic diagram of the structure of the limiting sleeve and the internal hexagonal sleeve in this invention; Figure 10 This is a schematic diagram of the structure of the limiting seat and the counterweight seat in this invention.
[0015] Explanation of reference numerals in the attached figures: 1. Lifting seat; 2. Counterweight seat; 3. Frame; 4. Mounting frame; 5. Linear lifting mechanism; 5-1. Lifting frame; 5-2. Linear lifting slide rail; 5-3. Linear lifting slider; 5-4. Contact lifting mechanism; 6. Guide frame; 6-1. Guide pin; 6-2. Guide groove; 6-3. Contact lifting cylinder; 6-4. Mounting compartment; 7. Mounting seat; 8. Spline rod; 9. Connecting seat; 10. Connecting rod; 11. Limiting plate; 12. Limiting rod; 13. Limiting block; 14. Spring; 15. Internal threaded sleeve; 16. External threaded sleeve; 17. Support plate; 18. Pressure-bearing lifting slide rail; 19. Pressure-bearing lifting slider; 20. Guide rod; 21. Guide seat; 22. Connecting arm; 23. Pressure-bearing lifting cylinder; 24. Limiting sleeve; 25. Limiting seat; 26. Slot; 27. Slot; 28. Internal hexagonal sleeve; 29. Main gear; 30. Secondary gear. Detailed Implementation
[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] like Figure 1-10 As shown, the specific implementation adopts the following technical solution: This specific embodiment includes a frame 3 and a mounting frame 4, wherein the mounting frame 4 is disposed inside the frame 3, a linear lifting mechanism 5 is disposed on the mounting frame 4, and a contact lifting mechanism 6 is disposed on the linear lifting mechanism 5, a lifting seat 1 is disposed inside the linear lifting mechanism 5, and the lifting seat 1 is configured to cooperate with the contact lifting mechanism 6, and a counterweight seat 2 is configured on the lifting seat 1. A pressure-bearing lifting slide rail 19 is fixedly installed on the frame 3, and a pressure-bearing lifting slider 20 is fixedly installed on the mounting frame 4. The pressure-bearing lifting slider 20 is slidably mounted on the pressure-bearing lifting slide rail 19. A guide rod 21 is fixedly installed on the frame 3, and a guide seat 22 is movably sleeved on the guide rod 21. A connecting arm 23 is spun on the guide seat 22 through a rotating shaft. The lower end of the connecting arm 23 is spun on the mounting frame 4 through a rotating shaft. A pressure-bearing lifting cylinder 24 is fixedly installed on the frame 3, and the output end of the pressure-bearing lifting cylinder 24 is fixedly installed on the guide seat 22. The linear lifting mechanism 5 includes a lifting frame 5-1 and a linear lifting cylinder 5-4. The lifting frame 5-1 is installed inside the mounting frame 4, and a linear lifting slide rail 5-2 is fixedly installed on the mounting frame 4. A linear lifting slider 5-3 is fixedly installed on the lifting frame 5-1, and the linear lifting slider 5-3 is slidably mounted on the linear lifting slide rail 5-2. The linear lifting cylinder 5-4 is fixedly installed on the mounting frame 4, and the output end of the linear lifting cylinder 5-4 is fixedly installed on the lifting frame 5-1. The contact lifting mechanism 6 includes a guide. The system comprises a frame 6-1 and a contact lifting cylinder 6-4, wherein the lifting seat 1 is movably inserted inside the lifting frame 5-1, the guide frame 6-1 is movably mounted on the lifting frame 5-1 and the guide frame 6-1 is movably mounted on the lifting seat 1, the guide frame 6-1 is provided with a guide groove 6-3, the outer wall of the lifting seat 1 is fixedly provided with a guide pin 6-2, the guide pin 6-2 is movably inserted into the guide groove 6-3, and the contact lifting cylinder 6-4 is fixedly mounted on the lifting frame 5-1, and the output end of the contact lifting cylinder 6-4 is fixedly mounted on the guide frame 6-1. An installation chamber 7 is fixedly installed at the lower end of the lifting seat 1. An installation seat 8 is movably installed inside the installation chamber 7. A counterweight seat 2 is installed on the installation seat 8. A limiting sleeve 25 is screwed into the installation seat 8 via a rotating shaft. A limiting seat 26 is fixedly installed on the counterweight seat 2. The limiting seat 26 passes through the bottom plate of the installation seat 8 and is inserted into the limiting sleeve 25. A slot 27 with a single-end opening is opened on the inner wall of the limiting sleeve 25. A locking block 28 is integrally formed on the outer wall of the limiting seat 26 and is movably locked in the slot 27. An internal hexagonal sleeve 29 is screwed onto the installation seat 8 via a bearing. A main gear 30 is fixedly fitted on the internal hexagonal sleeve 29. A secondary gear 31 is fixedly fitted on the limiting sleeve 25, and the secondary gear 31 and the main gear 30 are meshed with each other. A splined rod 9 is fixedly installed on the installation seat 8. The splined rod 9 passes through the top plate of the installation chamber 7 and extends into the lifting seat 1. A connecting seat 10 is fixedly installed at the upper end and is located inside the lifting seat 1. An internal threaded sleeve 16 is fixedly installed on the partition inside the lifting seat 1. An external threaded sleeve 17 is threadedly installed inside the internal threaded sleeve 16. The upper end of the connecting rod 11 is movably inserted into the lower end of the external threaded sleeve 17. A limiting plate 12 is movably fitted on the connecting rod 11. A limiting rod 13 is fixedly installed on the limiting plate 12 and is movably installed on the partition inside the lifting seat 1. A limiting block 14 is fixedly installed at the upper end of the limiting rod 13. A support plate 18 is movably fitted on the connecting rod 11 and abuts against the lower end of the external threaded sleeve 17. The two ends of the support plate 18 are respectively mounted on the limiting rods 13 on both sides. A spring 15 is fitted on the connecting rod 11 and the upper end of the spring 15 abuts against the support plate 18 and the lower end of the spring 15 abuts against the limiting plate 12.
[0018] When using this device, the frame 3 is fixedly mounted on an external machine platform, with the counterweight 2 positioned above the worktable. The workpiece is placed on the worktable, and then the linear lifting cylinder 5-4 pushes the lifting frame 5-1 downwards. The lifting frame 5-1 lowers the lifting seat 1, causing the lifting seat 1 to bring the counterweight 2 closer to the top of the workpiece. After the linear lifting cylinder 5-4 extends, the contact lifting cylinder 6-4 moves the guide frame 6-1. The guide frame 6-1, through its guide groove 6-3, engages with the guide pin 6-2 on the lifting seat 1, allowing the guide frame 6-1 to move and push the lifting seat 1 downwards within the lifting frame 5-1 so that the counterweight 2 can contact the workpiece. The lifting seat 1 descends in a decelerated motion until the counterweight 2 touches the workpiece and the lifting seat 1 continues to move downward, causing the spline rod 9 to slide on the top plate of the mounting chamber 7. This causes the connecting seat 10 to detach from the top plate of the mounting chamber 7 and not contact the limiting plate 12. Thus, the pressure test on the workpiece is achieved by the weight of the counterweight 2, mounting seat 8, spline rod 9, etc. When additional pressure is applied to the workpiece, the pressure-bearing lifting cylinder 24 pushes the guide seat 22 to move on the guide rod 21. The guide seat 22 pushes the mounting frame 4 through the connecting arm 23, and the mounting frame 4 slides on the pressure-bearing lifting slide rail 19 through the pressure-bearing lifting slider 20. The mounting frame 4 descends, causing the lifting frame 5-1, lifting seat 1, and mounting compartment 7 to descend as well. The descending lifting seat 1, in turn, causes the external threaded sleeve 17 and internal threaded sleeve 16 to descend. The internal threaded sleeve 16 abuts against the support plate 18, which in turn, via the spring 15, abuts against the limiting plate 12. After the limiting plate 12 abuts against the connecting seat 10, the spring 15 is tightened as the lifting seat 1 continues to descend. Through the transmission between the support plate 18 and the connecting seat 10, and through the transmission via the spline rod 9, the mounting seat 8 and its counterweight 2 are pressed against the workpiece, applying additional pressure from the contraction of the spring 15. The external threaded sleeve 17 is rotated to adjust its position on the internal threaded sleeve 16, thereby adjusting the support plate. The initial distance between the support plate 18 and the limiting plate 12 is adjusted to achieve the initial preload of the spring 15, thus adjusting the initial value of the additional pressure provided by the spring 15 on the workpiece. When the internal threaded sleeve 16 pushes the support plate 18 down, the preload of the spring 15 is increased; conversely, when the internal threaded sleeve 16 rises, the preload of the spring 15 is decreased. When changing different counterweights 2, the internal hexagonal sleeve 29 is rotated by a tool, thereby driving the limiting sleeve 25 to rotate through the transmission of the main gear 30 and the auxiliary gear 31. This causes the limiting sleeve 25 to rotate until the slot 27 disengages from the block 28, thereby pulling the counterweight 2. The counterweight 2 then drives the limiting seat 26 to pull the block 28 out of the slot 27, completing the disassembly of the counterweight 2.
[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. This device, through the cooperation of linear lifting cylinder 5-4, contact lifting cylinder 6-4 and pressure lifting cylinder 24, enables the lifting seat 1 to have a three-stage moving stroke, realizing the three-stage stroke of the lifting seat 1 driving the counterweight seat 2 to approach the workpiece, contact the workpiece, and apply additional pressure to the workpiece, thereby realizing the pressure test of the CCM module by using a pneumatic rod as a drive. 2. Based on the linear lifting cylinder 5-4 driving the lifting frame 5-1 to descend, this device drives the guide frame 6-1 to move through the contact lifting cylinder 6-4, and cooperates with the arc-shaped guide groove 6-3 on the guide frame 6-1 to drive the lifting seat 1 into a decelerated descent state, so that the lifting seat 1 drives the counterweight to gently contact the workpiece, preventing large impact on the workpiece. 3. This device uses a spline rod 9 to movably mount the counterweight in the mounting compartment 7 on the lifting seat 1. The movement of the spline rod 9 and the connecting rod 11 is achieved through the cooperation of the inner threaded sleeve 16 and the outer threaded sleeve 17, and through the cooperation of the support plate 18 and the limiting plate 12. A spring 15 is provided to provide additional support, thereby achieving the tension provided by the pre-tension of the spring 15, and providing additional pressure to the counterweight. 4. This device uses the cooperation of the limiting seat 26 and the limiting sleeve 25 to install the counterweight seat 2 on the mounting base 8. The cooperation of the locking block 28 and the locking groove 27 realizes the locking and limiting between the limiting seat 26 and the limiting sleeve 25, thereby realizing the replacement of different counterweight seats 2. Furthermore, the meshing of the main gear 30 and the secondary gear 31 realizes the transmission between the internal hexagonal sleeve 29 and the limiting sleeve 25. By controlling the rotation of the internal hexagonal sleeve 29, the rotation of the limiting sleeve 25 is realized, thereby realizing the loading and unloading of the counterweight seat 2.
[0020] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.
Claims
1. A test fixture for a pneumatically pressurized CCM module, comprising a lifting seat (1) and a counterweight seat (2), wherein the counterweight seat (2) is configured to cooperate with the lifting seat (1); characterized in that, It also includes: The frame (3) is positioned above the lifting seat (1); Mounting frame (4), the mounting frame (4) is set inside the frame (3), and the lifting seat (1) is set on the mounting frame (4); A linear lifting mechanism (5) is mounted on a mounting frame (4) and is configured in conjunction with a lifting seat (1); The contact lifting mechanism (6) is mounted on the linear lifting mechanism (5) and is configured in conjunction with the lifting seat (1); The linear lifting mechanism (5) drives the contact lifting mechanism (6) and the lifting seat (1) to move synchronously, thereby driving the counterweight seat (2) to move quickly and approach the workpiece. The contact lifting mechanism (6) drives the lifting seat (1) to move again, thereby driving the counterweight seat (2) to move slowly and contact the workpiece. The counterweight seat (2) is placed on the workpiece to achieve pressure testing of the workpiece.
2. The pneumatic compression structure CCM module test fixture according to claim 1, characterized in that: The linear lifting mechanism (5) includes: The lifting frame (5-1) is located inside the mounting frame (4), and the lifting seat (1) is movably located inside the lifting frame (5-1); Linear lifting slide rail (5-2), wherein there are two linear lifting slide rails (5-2) and they are fixedly installed on the front and rear inner walls of the mounting frame (4) respectively in a symmetrical manner; The linear lifting slider (5-3) consists of two linear lifting sliders (5-3) that are symmetrically fixed on the front and rear side walls of the lifting frame (5-1), and the linear lifting sliders (5-3) are slidably mounted on the linear lifting slide rail (5-2). A linear lifting cylinder (5-4) is fixedly mounted on the top plate of the mounting frame (4), and the output end of the linear lifting cylinder (5-4) is fixedly mounted on the lifting frame (5-1).
3. The pneumatic compression structure CCM module test fixture according to claim 2, characterized in that: The aforementioned contact lifting mechanism (6) includes: The guide frame (6-1) is slidably disposed inside the lifting frame (5-1) and is movably mounted outside the lifting seat (1); Guide pin (6-2), the inner wall of the guide frame (6-1) is provided with guide groove (6-3), the guide pin (6-2) is fixedly set on the outer wall of the lifting seat (1), and the guide pin (6-2) is movably inserted into the guide groove (6-3); The contact lifting cylinder (6-4) is fixedly mounted on the lifting frame (5-1), and the output end of the contact lifting cylinder (6-4) is fixedly mounted on the guide frame (6-1).
4. The pneumatic compression structure CCM module test fixture according to claim 3, characterized in that: The lower end of the lifting seat (1) is fixedly provided with an installation compartment (7), and an installation seat (8) is movably provided inside the installation compartment (7), with a counterweight seat (2) provided on the installation seat (8).
5. A test fixture for a pneumatically compressed CCM module according to claim 4, characterized in that: A spline rod (9) is fixedly installed on the mounting base (8), and the spline rod (9) is movably inserted through the top plate of the mounting compartment (7). A connecting seat (10) is fixedly installed at the upper end of the spline rod (9), and the connecting seat (10) is installed inside the lifting base (1).
6. A test fixture for a pneumatically compressed CCM module according to claim 5, characterized in that: A connecting rod (11) is fixedly installed on the connecting seat (10). The connecting rod (11) is movably inserted through the partition plate inside the lifting seat (1). A limiting plate (12) is movably sleeved on the connecting rod (11). A limiting rod (13) is fixedly installed on the limiting plate (12). The limiting rod (13) is movably inserted through the partition plate inside the lifting seat (1). A limiting block (14) is fixedly installed at the upper end of the limiting rod (13). The limiting block (14) is movably abutted against the upper surface of the partition plate inside the lifting seat (1). A spring (15) is sleeved on the connecting rod (11). The spring (15) is clamped between the limiting plate (12) and the partition plate inside the lifting seat (1).
7. A test fixture for a pneumatically compressed CCM module according to claim 6, characterized in that: An internal threaded sleeve (16) is fixedly inserted through the partition plate inside the lifting seat (1). An external threaded sleeve (17) is inserted through the internal threaded sleeve (16) by threaded connection. The upper end of the connecting rod (11) is inserted into the lower port of the external threaded sleeve (17). A support plate (18) is sleeved on the connecting rod (11), and the two ends of the support plate (18) are respectively movably locked on the limiting rods (13) on both sides. The upper end of the spring (15) abuts against the support plate (18), the lower end of the spring (15) abuts against the limiting plate (12), and the support plate (18) abuts against the lower end of the external threaded sleeve (17).
8. A test fixture for a pneumatically compressed CCM module according to claim 7, characterized in that: The frame (3) is fixedly provided with a pressure-bearing lifting slide rail (19), the mounting frame (4) is fixedly provided with a pressure-bearing lifting slider (20), and the pressure-bearing lifting slider (20) is slidably mounted on the pressure-bearing lifting slide rail (19). The frame (3) is fixedly provided with a guide rod (21), the guide rod (21) is movably sleeved with a guide seat (22), the guide seat (22) is spun with a connecting arm (23) through a rotating shaft, and the movable end of the connecting arm (23) is spun with a rotating shaft on the mounting frame (4). The frame (3) is fixedly provided with a pressure-bearing lifting cylinder (24), and the output end of the pressure-bearing lifting cylinder (24) is fixedly mounted on the guide seat (22).
9. A test fixture for a pneumatically compressed CCM module according to claim 8, characterized in that: The mounting base (8) is provided with a limiting sleeve (25) by rotating a shaft. The counterweight (2) is fixedly provided with a limiting seat (26). The limiting seat (26) passes through the bottom plate of the mounting base (8) and is inserted into the limiting sleeve (25). The limiting sleeve (25) is provided with a slot (27) with a single end opening. The limiting seat (26) is fixedly provided with a locking block (28), and the locking block (28) is movably inserted into the slot (27). The mounting base (8) is provided with an internal hexagonal sleeve (29) by rotating a bearing. The internal hexagonal sleeve (29) is fixedly provided with a main gear (30). The limiting sleeve (25) is fitted and fixedly provided with a secondary gear (31). The main gear (30) and the secondary gear (31) are meshed with each other.