A cam locking mechanism for fixing a push-pull clamp plate in a shaking table

Abstract

A cam locking mechanism for fixing a push-pull clamping plate on a rocker bed includes an upper locking block, a lower locking block, and a cam clamping handle. The upper locking block is mounted on the side edge of the clamping plate, and the lower locking block is mounted on the side edge of the upper plate of the rocker bed. One end of the cam clamping handle is provided with a hinged cam seat, which is rotatably connected to one end of a rotating support column via a first rotating shaft. A first through-hole groove is formed in the middle of the lower surface of the upper locking block, and a second through-hole groove is formed in the middle of the upper surface of the lower locking block, with the first and second through-hole grooves corresponding vertically. A hinged seat is mounted on the lower surface of the upper plate of the rocker bed. The other end of the rotating support column passes through a strip-shaped sliding hole channel and is rotatably connected to the hinged seat via a second rotating shaft. The cam clamping handle swings up and down through the cooperation of the rotating support column and the hinged seat. This invention overcomes the shortcomings of the prior art, requiring only a simple rotation and pushing action of the cam clamping handle to complete locking or unlocking.

Description

Technical Field

[0001] This utility model relates to the technical field of biological shaking equipment, specifically to a cam locking mechanism suitable for fixing the push-pull clamp plate of a shaking table. Background Technology

[0002] In the field of materials mechanical property testing, especially high-frequency vibration fatigue testing, the shaking table (or vibration test table) is a key piece of equipment. It applies cyclic loads to the specimen by generating controlled vibrations to evaluate the material's durability, fatigue limit, and other properties. During this test, the specimen must be reliably fixed to the shaking table's worktable using push-pull clamps to ensure effective transmission of vibration energy and prevent data distortion or safety accidents caused by clamp loosening.

[0003] Currently, the mainstream technical solutions for fixing the rocker clamp plate mainly include the following three types:

[0004] The first method is bolt fastening, which involves screwing bolts into multiple pre-set threaded holes, relying on the friction generated by the bolt preload to press the clamp plate. This method is simple in structure and low in cost, but it has significant drawbacks: a) Low operational efficiency: Installation and disassembly require tightening or loosening multiple bolts one by one, which is time-consuming and labor-intensive. b) Difficulty in controlling preload: The amount of preload depends on the operator's experience and feel; too little preload will easily loosen the clamp, while too much may damage the threads or the clamp plate. c) Poor vibration resistance reliability: Under long-term high-frequency vibration conditions, bolts are prone to "creep" or "loosening," leading to a decrease in preload and even nut loosening, causing clamp fixation failure.

[0005] The second method is hydraulic or pneumatic clamping, which uses hydraulic or pneumatic cylinders to drive the clamping mechanism, enabling rapid clamping and release of the clamping plate. This method has the advantages of large clamping force and convenient operation; however, its disadvantages are equally prominent: a) High system complexity: It requires a pump station, pipelines, valve blocks, and sealing systems, resulting in a large and complex overall structure; b) Risk of leakage: Leaks in hydraulic oil can contaminate the clean experimental environment, while leaks in the pneumatic system can make it difficult to maintain pressure; c) High purchase and maintenance costs.

[0006] The third type is a simple cam mechanism, which uses an eccentric wheel or cam principle to achieve rapid clamping and releasing by turning a handle. It improves operational efficiency to some extent. However, existing simple cam mechanisms are not optimized for vibration conditions. Their main problems are: a) Insufficient self-locking stability: Under continuous vibration and impact, especially with multi-directional vibration, traditional cam mechanisms may experience "springback" or "over-center" phenomena, leading to the destruction of the self-locking angle and accidental unlocking; b) Poor clamping force accuracy and consistency; c) Lack of vibration-resistant structural design, making them prone to abnormal noise or wear due to vibration. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a cam locking mechanism suitable for fixing the push-pull clamp plate of a rocker bed. It overcomes the deficiencies of existing technologies by requiring only a simple rotation and pushing action of the cam clamping handle to complete locking or unlocking. This completely avoids the tedious operation of tightening multiple bolts one by one in traditional bolt fastening methods, as well as the complex start-stop process of hydraulic / pneumatic systems.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A cam locking mechanism for fixing a push-pull clamping plate of a rocker bed includes an upper locking block, a lower locking block, and a cam pressing handle. The upper locking block is fixedly installed on the side edge of the lower surface of the clamping plate, and the lower locking block is fixedly installed on the side edge of the upper plate of the rocker bed, and the upper locking block and the lower locking block cooperate with each other.

[0010] One end of the cam clamping handle is provided with a hinged cam seat. The hinged cam seat is rotatably connected to one end of the rotating support column via a first rotating shaft. The cam clamping handle rotates left and right on the horizontal plane around the first rotating shaft. A first through-hole groove is opened in the middle of the lower surface of the upper locking block, and a second through-hole groove is opened in the middle of the upper surface of the lower locking block. The first through-hole groove and the second through-hole groove correspond vertically to form a strip-shaped sliding hole channel. A hinge seat is fixedly installed on the lower surface of the upper plate of the rocker near the lower locking block. The other end of the rotating support column passes through the strip-shaped sliding hole channel and is rotatably connected to the hinge seat via a second rotating shaft. The cam clamping handle swings up and down through the cooperation of the rotating support column and the hinge seat.

[0011] Preferably, a support spring is fitted on the outer surface of the rotating support column, and a washer is fitted on one end of the rotating support column near the hinge cam seat. The two ends of the support spring abut against the washer and the hinge seat respectively, for providing the clamping force of the cam clamping handle in the locked state.

[0012] Preferably, the lower surface of the upper locking block is provided with a first inclined surface, and the upper surface of the lower locking block is provided with a second inclined surface, wherein the first inclined surface and the second inclined surface are movably fitted together.

[0013] Preferably, both the first inclined surface and the second inclined surface are provided with interlocking serrated grooves.

[0014] This invention provides a cam locking mechanism for fixing a push-pull clamp plate on a shaking table, offering the following advantages: By optimizing the linkage design between the hinged cam seat structure of the cam clamping handle and the locking block, rapid locking and unlocking of the clamp plate is achieved. The operation requires only a simple rotation and pushing motion of the cam clamping handle to lock or unlock, completely avoiding the tedious operation of tightening multiple bolts individually in traditional bolt fastening methods, as well as the complex start-stop process of hydraulic / pneumatic systems. A single person can easily complete all operations, greatly simplifying the clamping process and saving operation time. It is particularly suitable for testing occasions requiring frequent sample changes, significantly improving overall work efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of this utility model or the prior art will be briefly introduced below.

[0016] Figure 1 Schematic diagram of the structure of this utility model when opened. Figure 1 ;

[0017] Figure 2 Schematic diagram of the structure of this utility model when opened. Figure 2 ;

[0018] Figure 3 Schematic diagram of the structure of this utility model when closed. Figure 1 ;

[0019] Figure 4 Schematic diagram of the structure of this utility model when closed. Figure 2 ;

[0020] Figure 5 A partial structural schematic diagram of this utility model;

[0021] Explanation of the labels in the diagram:

[0022] 1. Upper locking block; 2. Lower locking block; 3. Cam clamping handle; 4. Fixture plate; 5. Upper plate of the rocker; 6. Hinge seat; 31. Hinge cam seat; 32. Rotary support column; 33. First rotating shaft; 34. Second rotating shaft; 35. Support spring; 36. Shim; 11. First through hole groove; 12. First inclined surface; 21. Second through hole groove; 22. Second inclined surface. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0024] Example 1, as Figure 1-5As shown, a cam locking mechanism suitable for fixing a rocker bed push-pull clamp plate includes an upper locking block 1, a lower locking block 2 and a cam pressing handle 3. The upper locking block 1 is fixedly installed on the lower surface side edge of the clamp plate 4, and the lower locking block 2 is fixedly installed on the side edge of the upper plate 5 of the rocker bed, and the upper locking block 1 and the lower locking block 2 cooperate with each other.

[0025] One end of the cam clamping handle 3 is provided with a hinged cam seat 31. The hinged cam seat 31 is rotatably connected to one end of the rotating support column 32 through the first rotating shaft 33. The cam clamping handle 3 rotates left and right on the horizontal plane around the first rotating shaft 33. The lower surface of the upper locking block 1 is provided with a first through hole groove 11 in the middle. The upper surface of the lower locking block 2 is provided with a second through hole groove 21 in the middle. The first through hole groove 11 and the second through hole groove 21 correspond vertically to form a strip-shaped sliding hole channel. A hinge seat 6 is fixedly installed on the lower surface of the rocker upper plate 5 near the lower locking block 2. The other end of the rotating support column 32 passes through the strip-shaped sliding hole channel and is rotatably connected to the hinge seat 6 through the second rotating shaft 34. The cam clamping handle 3 swings up and down through the cooperation of the rotating support column 32 and the hinge seat 6.

[0026] In this embodiment, a support spring 35 is sleeved on the outer surface of the rotating support column 32, and a gasket 36 is sleeved on one end of the rotating support column 32 near the hinge cam seat 31. The two ends of the support spring 35 abut against the gasket 36 and the hinge seat 6 respectively, and are used to provide the clamping force of the cam clamping handle 3 in the locked state.

[0027] Working principle:

[0028] In the initial state, the cam clamping handle 3 is in the open position (usually the initial 0° position). At this time, the rotating support column 32 is located below the strip-shaped sliding channel (i.e., inside the second through-hole groove 21), and the hinged cam seat 31 at one end of the cam clamping handle 3 is in a natural state. The support spring 35 is in a free state and does not apply any clamping force to the cam clamping handle 3, allowing the rotating support column 32 to slide freely within the second through-hole groove 21. In this state, the upper locking block 1 and the lower locking block 2 can be completely disengaged, and the operator can easily pull out or push the clamp plate 4 into place.

[0029] When it is necessary to lock the clamp plate, the clamp plate 4 can first be pushed to the designated position so that the lower surface of the upper locking block 1 and the upper surface of the lower locking block 2 are correspondingly fitted. At this time, the first through hole groove 11 and the second through hole groove 21 are aligned with each other to form a complete strip-shaped sliding hole channel. Then, the operator pushes the entire cam clamping handle 3 and the rotating support column 32 upward along the strip-shaped sliding hole channel, so that the rotating support column 32 swings upward around the second rotating shaft 34, thereby driving the cam clamping handle 3 to lift upward, so that the rotating support column 32 enters the first through hole groove 11. After that, the cam clamping handle 3 is rotated around the first rotating shaft 33 in the locking direction (usually 90° to 180° clockwise or counterclockwise). As the cam clamping handle 3 rotates, the contour radius of the eccentric cam of the hinged cam seat 31 gradually increases, and its outer edge also begins to apply pressure to the support spring 35, causing the support spring 35 to compress.

[0030] When the cam clamping handle 3 is rotated to the locked position, the clamping block on the side surface of the cam clamping handle 3 is also pressed against the outer surface of the upper locking block 1. Furthermore, the force transmission path of the cam mechanism of the hinged cam seat 31 has passed the "dead point." At this time, the elastic force of the support spring 35 acts on the washer and the hinged cam seat, generating a strong reverse torque that firmly locks the cam mechanism in this position, forming a reliable self-locking state. This effectively ensures the stability of the wheel clamping handle 3 in the locked position and effectively avoids accidental loosening due to external vibration or impact. Simultaneously, the rotating support column 32 is completely located within the first through-hole groove 11, ensuring that the upper locking block 1 and the lower locking block 2 are tightly fitted, and the clamping plate 4 is firmly locked.

[0031] During unlocking, the operator simply rotates the cam clamping handle 3 90 degrees in the opposite direction to overcome the elastic force of the support spring 35, causing the eccentric cam profile of the hinged cam seat 31 to move past the dead point. Then, the operator can push the cam clamping handle 3 and the rotating support column 32 downwards again, causing the rotating support column 32 to swing downwards around the second pivot 34. This causes the rotating support column 32 to exit from the first through-hole groove 11 and return to the second through-hole groove 21. At this point, the contact pressure between the upper locking block 1 and the lower locking block 2 is released, allowing the clamping plate 4 to move freely.

[0032] This invention optimizes the linkage design between the cam mechanism and the locking block, enabling rapid locking and unlocking of the clamping plate. The operation requires only a simple rotation and push of the cam clamping handle to lock or unlock, completely avoiding the tedious operation of tightening multiple bolts individually in traditional bolt tightening methods, as well as the complex start-stop process of hydraulic / pneumatic systems. A single person can easily complete the entire operation, greatly simplifying the clamping process and saving operation time. It is particularly suitable for testing applications requiring frequent sample changes, significantly improving overall work efficiency.

[0033] In Embodiment Two, as a further preferred embodiment of Embodiment One, the lower surface of the upper locking block 1 is provided with a first inclined surface 12, and the upper surface of the lower locking block 2 is provided with a second inclined surface 22. The first inclined surface 12 and the second inclined surface 22 are movably fitted together. By adopting the design of the mutually fitted first inclined surface 12 and the second inclined surface 22, during the fitting process of the upper locking block 1 and the lower locking block 2, the two inclined surfaces generate a horizontal component force during the locking process, which can automatically eliminate the assembly gap between the fixture plate and the upper plate of the shaking table 5, ensuring the efficient transmission of vibration energy.

[0034] In Example 3, as a further preferred embodiment of Example 1, both the first inclined surface 12 and the second inclined surface 22 are provided with interlocking serrated grooves. By adding interlocking serrated grooves to the surfaces of the first inclined surface 12 and the second inclined surface 22, the friction coefficient of the contact surface can be greatly increased through the interlocking action, which can effectively resist the transverse shear force generated by vibration, prevent the fixture plate from fretting or slipping in the horizontal plane, and ensure the accurate positioning of the sample.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cam locking mechanism suitable for fixing a push-pull clamp plate in a shaking table, characterized in that: It includes an upper locking block (1), a lower locking block (2) and a cam clamping handle (3). The upper locking block (1) is fixedly installed on the lower surface side edge of the clamp plate (4), and the lower locking block (2) is fixedly installed on the side edge of the upper plate (5) of the rocker, and the upper locking block (1) and the lower locking block (2) cooperate with each other. One end of the cam clamping handle (3) is provided with a hinged cam seat (31). The hinged cam seat (31) is rotatably connected to one end of the rotating support column (32) through a first rotating shaft (33). The cam clamping handle (3) rotates left and right on the horizontal plane around the first rotating shaft (33). The lower surface of the upper locking block (1) is provided with a first through hole groove (11). The upper surface of the lower locking block (2) is provided with a second through hole groove (21). The first through hole groove (11) and the second through hole groove (21) correspond vertically to form a strip-shaped sliding hole channel. The lower surface of the rocker upper plate (5) is fixedly installed with a hinge seat (6) near the lower locking block (2). The other end of the rotating support column (32) passes through the strip-shaped sliding hole channel and is rotatably connected to the hinge seat (6) through a second rotating shaft (34). The cam clamping handle (3) swings up and down through the cooperation of the rotating support column (32) and the hinge seat (6).

2. The cam locking mechanism for fixing a push-pull clamp plate of a shaking table according to claim 1, characterized in that: The outer surface of the rotating support column (32) is fitted with a support spring (35), and a gasket (36) is fitted at one end of the rotating support column (32) near the hinge cam seat (31). The two ends of the support spring (35) abut against the gasket (36) and the hinge seat (6) respectively, and are used to provide the clamping force of the cam clamping handle (3) in the locked state.

3. The cam locking mechanism for fixing a push-pull clamp plate of a shaking table according to claim 1, characterized in that: The lower surface of the upper locking block (1) is provided with a first inclined surface (12), and the upper surface of the lower locking block (2) is provided with a second inclined surface (22). The first inclined surface (12) and the second inclined surface (22) are in movable contact.

4. A cam locking mechanism for fixing a push-pull clamp plate of a shaking table according to claim 3, characterized in that: Both the first inclined surface (12) and the second inclined surface (22) are provided with interlocking sawtooth grooves.

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