Special testing machine for header

Abstract

The invention discloses a special test machine for a header, which is characterized by comprising a mounting frame, the header, a height adjusting mechanism, a transmission simulation mechanism and a control mechanism, one end of the header is rotatably connected to the mounting frame, the height adjusting mechanism is used for adjusting the height of the header, the transmission simulation mechanism is used for simulating the transmission of the header in the machine, and the control mechanism is used for controlling the header to rotate. The height adjusting mechanism comprises an executing mechanism and a transmission mechanism, and the executing mechanism acts on the other end of the header through the transmission mechanism so that the header can rotate on the vertical face around the connecting position of the header and the installation frame.

Description

Technical Field

[0001] The present invention is a special testing machine for a cutter bar. Background Art

[0002] Type B belts are widely used in drive systems, especially in mechanical equipment and automotive drive systems. Due to their specific groove angle design, Type B belts can adapt to pulleys of different diameters, thus ensuring transmission efficiency and working stability. Especially in equipment such as lawn mowers, the use of Type B belts is more common. The Type B belts used in lawn mowers face a relatively harsh working environment, such as factors like high temperature and belt angle drive, which impose relatively high requirements on the performance of the belts. Therefore, imported special Type B belts are often used in lawn mowers to ensure stable working performance.

[0003] With the intensification of market competition, domestic belt manufacturers have gradually started to provide personalized services for customized needs, which has led to an increasing demand. To ensure the quality and adaptability of Type B belts, the market's demand for special testing equipment has also been growing. However, there are some deficiencies in the existing special testing machines on the market. Especially when testing Type B belts for lawn mowers, the safety, stability, and operation convenience of the cutter bar height adjustment mechanism urgently need to be improved. The existing equipment does not perform well in these aspects and fails to effectively solve the potential safety hazards and operation inconveniences that may occur during use. Summary of the Invention

[0004] The purpose of the present invention is to solve the above deficiencies of the prior art and provide a special testing machine for a cutter bar.

[0005] A special testing machine for a cutter bar includes a mounting frame, a cutter bar, a height adjustment mechanism, a transmission simulation mechanism, and a control mechanism. One end of the cutter bar is rotatably connected to the mounting frame. The height adjustment mechanism is used to adjust the height of the cutter bar, and the transmission simulation mechanism is used to simulate the transmission of the cutter bar in the machine. The height adjustment mechanism includes an actuator and a transmission mechanism. The actuator acts on the other end of the cutter bar through the transmission mechanism, causing the cutter bar to rotate in a vertical plane around its connection with the mounting frame.

[0006] Further, a connecting portion is provided at the tail end of the cutter bar, and a long through hole is provided on the side. A relief notch is provided above the long through hole. A U-shaped bracket is provided on the mounting frame, and the bottom edge of the U-shaped bracket is movably clamped into the long through hole from the relief notch.

[0007] Further, the transmission simulation mechanism includes a plurality of belt pulleys, a first belt, a second belt, an idler pulley, a motor, and a clutch. The clutch and the idler pulley are coaxially installed on the mounting frame. The output end of the motor is connected to the idler pulley through the first belt, and the clutch is connected to the plurality of belt pulleys through the second belt to achieve transmission and drive the cutter to work.

[0008] Furthermore, the control mechanism includes an electrical control cabinet, an electric shock protector, a voltage converter, and a time relay. The electric shock protector is used to protect the motor and the clutch. The voltage converter is used for the conversion of the clutch voltage. The time relay controls the interval time of the clutch engagement. The electrical control cabinet is used to control the motor and the clutch.

[0009] Furthermore, the actuator is a linear telescopic cylinder. The linkage mechanism includes a third connecting rod. One end of the third connecting rod is fixedly connected to the rotating shaft, and the other end is connected to the telescopic end of the cylinder.

[0010] Furthermore, the linkage mechanism and the cylinder are located on the same side of the rotating shaft as the cutting table.

[0011] Furthermore, the height adjustment mechanism further includes a locking mechanism. The locking mechanism includes a clamping plate, a handle, and a first connecting rod. The clamping plate is fixedly sleeved on the outside of the handle. The handle is rotatably connected to the mounting bracket. A plurality of clamping grooves are circumferentially spaced on the edge of the clamping plate. The perpendicular distance from each clamping groove to the handle is different.

[0012] Both ends of the first connecting rod are respectively connected to the first connecting rod and the telescopic end of the cylinder. A guiding groove is provided on the side surface of the first connecting rod. A guiding member is provided in the guiding groove. The guiding groove is in sliding fit with the guiding member. The guiding member is fixed to the mounting bracket. A clamping portion cooperating with the clamping groove is provided on the first connecting rod.

[0013] Furthermore, a second connecting rod is further provided between the third connecting rod and the first connecting rod.

[0014] Furthermore, one end of a tension spring is connected to the connecting plate, and the other end of the tension spring is connected to the mounting bracket. Relative to the cutting table and the linkage mechanism, the tension spring is located on the other side of the rotating shaft.

[0015] Advantageous effects: Compared with the prior art, the present invention has the following advantages;

[0016] The structure of the height adjustment mechanism realizes the precise adjustment of the height of the cutting table through the combination of the rotating shaft, the connecting plate, the connecting rod, and the linkage mechanism. The axis of the rotating shaft is parallel to the rotation center line of the cutting table, ensuring the stability and accuracy during the height adjustment process. The actuator (such as a cylinder) acts on the rotating shaft through the linkage mechanism, driving the connecting rod and the cutting table to achieve height adjustment. This structure has good mechanical design during the adjustment process, ensuring that each adjustment action can be accurately realized, avoiding errors caused by unreasonable structure. It is applicable to automated test scenarios with frequent adjustments, can reduce the deviation in operation, and improve the reliability of the test.

[0017] During the height adjustment process, the contraction force of the cylinder interacts with the gravity of the cutter bar, ensuring that the cutter bar can be automatically lifted and lowered under different conditions. When the pulling force of the cylinder contraction is greater than the gravity of the cutter bar, the cutter bar will rise; when the pulling force is less than the gravity of the cutter bar, the cutter bar will descend. The function of the tension spring is to provide an additional compensating force, offset the influence brought by the weight of the cutter bar, reduce the burden on the cylinder, and play a buffering role when the cutter bar descends. This not only reduces the load fluctuation of the cylinder, but also extends the service life of key components, while maintaining the stability and reliability of the system during dynamic adjustment.

[0018] The locking mechanism provides a stable locking function for the height position through the cooperation of the clamping plate, the handle and the card slot. Each card slot represents a fixed height gear, and the handle can control the clamping plate to enter the corresponding card slot by rotation, so as to achieve precise fixation of the cutter bar height. This design can ensure that the cutter bar remains in a stable position after adjustment, avoiding height changes caused by external vibration or misoperation. The locking mechanism is simple and reliable, improving the safety during the test process and preventing errors or safety hazards caused by height slip of the equipment.

[0019] The design of this height adjustment mechanism is very compact. By arranging the cylinder and the linkage mechanism on the same side, it reduces unnecessary structural complexity and wiring. Through reasonable structural arrangement, the number of components and the assembly difficulty are reduced, making the system more reliable. The simple design not only improves the stability of the equipment, but also makes daily maintenance and fault troubleshooting more convenient. The operator can quickly handle equipment problems, thereby reducing the maintenance cost and equipment downtime, and improving the overall use efficiency of the equipment.

[0020] The design of this height adjustment mechanism greatly improves the operation convenience. The operator only needs to pull the cutter bar to the required height, then select and rotate the handle to align the clamping plate with the card slots of different gears. After releasing the handle, the clamping device will automatically lock the clamping plate into the corresponding card slot, thus achieving precise adjustment of the cutter bar height. This process does not require complex adjustment steps and can be completed only through simple mechanical operations, reducing the labor intensity of the operator and improving the operation efficiency. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the special testing machine;

[0022] Figure 2 is the front view of the special testing machine;

[0023] Figure 3 is a schematic diagram of the connection of the actuator, the linkage mechanism and the tension spring in the height adjustment mechanism;

[0024] Figure 4 is a schematic diagram of the locking mechanism;

[0025] In the figure, 1 is the mounting bracket, 2 is the cutter bar, 3 is the height adjustment mechanism, 4 is the motor, 5 is the electrical control cabinet, 6 is the pulley, 7 is the idler pulley, 8 is the clutch, 9 is the first belt, 10 is the second belt, 11 is the rotating shaft, 12 is the connecting plate, 13 is the connecting rod, 14 is the cylinder, 15 is the first connecting rod, 16 is the second connecting rod, 17 is the third connecting rod, 18 is the guiding member, 19 is the guiding groove, 20 is the tension spring, 21 is the connecting portion, 22 is the handle, 23 is the clamping plate, and 24 is the clamping groove. Detailed implementation mode

[0026] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0027] A special testing machine for a cutter bar includes a mounting bracket 1, a cutter bar 2, a height adjustment mechanism 3, a transmission simulation mechanism, and a control mechanism. One end of the cutter bar 2 is rotatably connected to the mounting bracket 1. The height adjustment mechanism 3 is used to adjust the height of the cutter bar 2. The transmission simulation mechanism is used to simulate the transmission of the cutter bar 2 in the machine. The height adjustment mechanism 3 includes an actuator and a transmission mechanism. The actuator acts on the other end of the cutter bar 2 through the transmission mechanism, causing the cutter bar 2 to rotate in the vertical plane around its connection with the mounting bracket 1.

[0028] In this implementation mode, the mounting bracket 1 serves as the main structure for supporting and installing other functional components. One end of the cutter bar 2 is rotatably connected to the mounting bracket 1, forming a fulcrum that allows the cutter bar 2 to rotate around the axis. The height adjustment mechanism 3 realizes the lifting control of the attitude of the cutter bar 2 through the actuator provided therein. The actuator acts on the rotating shaft 11 through the linkage mechanism, and then drives the connecting plate 12 and the connecting rod 13 structure through the rotating shaft 11, causing the cutter bar 2 to rotate around the rotating shaft 11 in the vertical plane, thereby completing the height adjustment. The transmission simulation mechanism is installed on the mounting bracket 1. By driving the idler pulley 7 with the motor 4 and passing through the clutch 8 device and multiple groups of belts and pulleys 6, the simulation drive of the working state of the cutter is realized. The control mechanism includes an electrical control cabinet, a time relay, a voltage converter, and an electric shock protection device, which are used to adjust the working parameters of the motor 4 and the clutch 8 to ensure the safe and reliable operation of the test.

[0029] This implementation mode realizes the precise adjustment of the height of the cutter bar 2 and the multi-angle simulation, improving the test simulation accuracy. The adjustment process is automated through the mechanical structure, and a stable transmission path is formed in cooperation with the linkage mechanism, enhancing the controllability and stability of the adjustment. The transmission simulation mechanism has a compact structure. By driving the cutter through the clutch 8 and multi-stage belt linkage, it can effectively simulate the real working conditions and provide support for performance verification and debugging. The electrical control part has functions such as overvoltage protection, delay control, and voltage conversion, improving the overall safety and intelligent level of the test system.

[0030] In a possible implementation, a connecting portion 21 is provided at the tail end of the cutter bar 2, and a long through hole is provided on the side surface. A relief notch is provided above the long through hole. A U-shaped bracket is provided on the mounting frame 1, and the bottom edge of the U-shaped bracket is movably clamped into the long through hole from the relief notch.

[0031] This structure realizes the detachable connection between the cutter bar 2 and the mounting frame 1 by providing a connecting portion 21 at the tail end of the cutter bar 2, forming a long through hole on its side surface, and providing a relief notch above the through hole, so that the bottom edge of the U-shaped bracket can be inserted from the notch and movably clamped with the long through hole. This design facilitates the quick assembly and disassembly of the cutter bar 2 and improves the maintainability of the equipment.

[0032] By setting the relief notch and the clamping structure of the U-shaped bracket, the installation process of the cutter bar 2 is simplified, while ensuring the connection reliability, enhancing the convenience of equipment maintenance and the efficiency of module replacement, and meeting the high-frequency debugging requirements in complex test environments.

[0033] In a possible implementation, the transmission simulation mechanism includes a plurality of pulleys 6, a first belt 9, a second belt 10, a transition pulley 7, a motor 4, and a clutch 8. The clutch 8 and the transition pulley 7 are coaxially installed on the mounting frame 1. The transition pulley 7 is connected to the output end of the motor 4 through the first belt 9, and the second belt 10 connects the clutch 8 and the plurality of pulleys 6 to achieve transmission to drive the cutter to work.

[0034] The motor 4 drives the transition pulley 7 on the mounting frame 1 to rotate through the first belt 9. The transition pulley 7 is linked with the second belt 10 through the coaxially installed clutch 8, and the power is transmitted to the plurality of distributed pulleys 6, thereby realizing the drive simulation of the cutter and forming a power path similar to that in actual operation.

[0035] This structure simulates the transmission process in the actual operation of the cutter bar 2, can evaluate and verify the wear resistance of the belt, and improves the simulation accuracy and practicality of the test system.

[0036] In a possible implementation, the control mechanism includes an electrical control cabinet 5, an electric shock protection electrical appliance, a voltage converter, and a time relay. The electric shock protector is used to protect the motor 4 and the clutch 8. The voltage converter is used for the voltage conversion of the clutch 8. The time relay controls the interval time of the clutch 8 combination, and the electrical control cabinet is used to control the motor 4 and the clutch 8.

[0037] The control system sets the electrical control cabinet as the master control unit and combines the electric shock protector to ensure the safe operation of the equipment. The voltage converter is used to adjust the power supply voltage to the voltage required by the clutch 8, and the time relay is used to accurately control the working time interval of the clutch 8. The motor 4 is used to simulate the oil engine, and the time relay is used to simulate the artificial mowing time to achieve the simulation control of the working cycle of the cutter.

[0038] With this control system configuration, the equipment has good safety, controllability, and debugging convenience, effectively extending the service life of key components and ensuring the reliable operation throughout the testing process.

[0039] In a possible implementation, the actuator of the height adjustment mechanism 3 is a linear telescopic cylinder 14.

[0040] The actuator uses a linear telescopic cylinder 14, which is driven by a gas source to control its expansion and contraction, thereby applying a force to the transmission mechanism connected to it to achieve the adjustment of the height of the cutting table 2.

[0041] Using the telescopic cylinder 14 as the power source has the advantages of fast response, high control precision, and compact structure, and is suitable for scenarios with high requirements for the response time and adjustment range of height adjustment in the test system.

[0042] In a possible implementation, the transmission mechanism of the height adjustment mechanism 3 includes a rotating shaft 11, a connecting plate 12, a connecting rod 13, and a linkage mechanism. The rotating shaft 11 is rotatably connected to the mounting frame 1, and the axis of the rotating shaft 11 is parallel to the rotation center line of the cutting table 2. The connecting plate 12 is fixedly connected to the rotating shaft 11. One end of the connecting rod 13 is connected to the connecting plate 12, and the connection point is offset from the axis of the rotating shaft 11. The other end of the connecting rod 13 is connected to the head end of the cutting table 2. The cutting table 2 is located on one side of the rotating shaft 11. The linkage mechanism is connected between the rotating shaft 11 and the actuator, and the actuator drives the rotating shaft 11 to rotate through the linkage mechanism.

[0043] In this structure, the actuator controls the action of the linkage mechanism to drive the rotation of the rotating shaft 11. The connecting plate 12 is fixed on the rotating shaft 11, so that the connecting rod 13 drives one end of the cutting table 2 to move up and down during rotation, thereby realizing the adjustment of the angle and height control of the cutting table 2.

[0044] Through the mechanical design of the transmission structure, the smooth adjustment of the angle and height of the cutting table 2 is realized. The action is precise and the mechanism is compact, which is suitable for frequent adjustment operations in the automated test scenario.

[0045] In a possible implementation, the linkage mechanism includes a first connecting rod 15, a second connecting rod 16, and a third connecting rod 17. The two ends of the second connecting rod 16 are respectively rotatably connected to one end of the first connecting rod 15 and the third connecting rod 17. The other end of the first connecting rod 15 is connected to the telescopic end of the cylinder 14, and the other end of the third connecting rod 17 is fixedly connected to the rotating shaft 11.

[0046] The expansion and contraction of the cylinder 14 drives the movement of the first connecting rod 15. Through the articulated structure formed by the second connecting rod 16 and the third connecting rod 17, the third connecting rod 17 drives the rotation of the rotating shaft 11, thereby indirectly controlling the angle and position of the cutting table 2 connected to the rotating shaft 11.

[0047] This multi-segment linkage design can effectively amplify the stroke of the cylinder 14, improve the action efficiency and adjustment range, while maintaining sensitive system response and strong stability, and enhancing the adjustment performance of the cutting table 2.

[0048] In a possible implementation, the linkage mechanism and the cylinder 14 are on the same side of the rotating shaft 11 as the cutting table 2.

[0049] Arrange the linkage mechanism and the cylinder 14 at a position on the same side as the cutting table 2;

[0050] Specifically, when the backward pulling force during the contraction of the cylinder 14 is greater than the gravity of the cutting table 2, the first link 15 and the second link 16 drive the third link 17 to rotate, and then drive the rotation, and further improve the height of the cutting table 2 through the connecting plate 12 and the connecting rod 13; when the backward pulling force during the contraction of the cylinder 14 is less than the gravity of the cutting table 2, the cutting table 2 decreases in height under the influence of gravity, and at this time the cylinder 14 plays a buffering role.

[0051] The first link is used for the locking mechanism, the second link is used to connect the first link and the third link, and the third link is used to rotate the rotating shaft.

[0052] This same-side arrangement method can reduce the structural complexity, improve the overall wiring simplicity and assembly convenience, and contribute to the miniaturization of the equipment and the improvement of the maintenance efficiency.

[0053] It should be noted that the positions of the cylinder 14 and the linkage mechanism can also be on the other side of the rotating shaft 11 relative to the cutting table 2, that is, the two are on the opposite side. At this time, the force exerted by the cylinder 14 is a thrust opposite to the above.

[0054] In a possible implementation, the height adjustment mechanism 3 further includes a locking mechanism. The locking mechanism includes a clamping plate 23 and a handle 22. The clamping plate 23 is fixedly sleeved on the outside of the handle 22. The handle 22 is rotatably connected to the mounting bracket 1. A plurality of card slots 24 are circumferentially spaced on the edge of the clamping plate 23. The perpendicular distance from each card slot 24 to the handle 22 is different. A guide groove 19 is provided on the side surface of the first link 15. A guide member 18 is provided in the guide groove 19. The guide groove 19 is slidably matched with the guide member 18. The guide member 18 is fixed to the mounting bracket 1. The first link 15 is provided with a clamping portion that cooperates with the card slot 24.

[0055] Each card slot 24 represents a gear position of a certain height of the cutting table 2. The cylinder 14 only exerts force to counteract the gravity of the cutting table 2 during the process of raising the height of the cutting table 2, and in the subsequent maintenance, it is the locking mechanism that counteracts the gravity of the cutting table 2. The cooperation between the card slot 24 and the clamping portion on the first link 15 can limit the displacement of the first link 15, thereby restricting the movement of the entire linkage mechanism, and further ensuring that the rotating shaft 11 remains stable under the influence of gravity and maintaining the height of the cutting table 2 unchanged.

[0056] The specific operation is as follows. First, the cylinder 14 pulls the first connecting plate 12 to move backward, so that the clamping plate 23 is located on the subsequent forward movement trajectory of the first connecting plate 12, and at the same time, it is ensured that the first connecting plate 12 does not interfere with the rotation of the clamping plate 23. Subsequently, the clamping plate 23 is rotated to select a certain height gear, the pulling force of the cylinder 14 shrinking backward decreases, the first connecting plate 12 moves forward until the connecting plate 12 cooperates with the clamping groove 24. At this time, the cylinder 14 stops exerting force, and the cutting table 2 is maintained at this height.

[0057] By setting the clamping groove 24 with multiple height positions, the positioning and locking of the action state of the linkage mechanism are realized. The handle 22 rotates to control the clamping plate 23 to be clamped into the corresponding position of the clamping groove 24, realizing the mechanical limit of the height position, and enhancing the stability and safety during adjustment.

[0058] The locking mechanism has a reliable structure and has the functions of rapid positioning and fixation, avoiding test errors or safety problems caused by the equipment sliding by itself after height adjustment, and improving the adjustment stability and service life of the equipment.

[0059] In a possible implementation manner, for the test special machine according to claim 7, one end of a tension spring 20 is connected to the connecting plate 12, and the other end of the tension spring 20 is connected to the mounting bracket 1. Relative to the cutting table 2 and the linkage mechanism, the tension spring 20 is located on the other side of the rotating shaft 11.

[0060] In this implementation manner, one end of the tension spring 20 is connected to the connecting plate 12, and the other end of the tension spring 20 is fixed to the structure of the mounting bracket 1, and the position of the tension spring 20 is arranged on the opposite side of the rotating shaft 11 relative to the cutting table 2 and the linkage mechanism. The tension spring 20 is used to offset part of the gravity influence during operation, provide a compensation effect for the cylinder 14, reduce the burden on the cylinder 14, and at the same time can also play a buffering role when the cutting table 2 descends, reduce the load fluctuation of the actuator, and extend the service life of key components.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A special test machine for a cutting table, characterized in that, It includes a mounting frame, a cutter bar, a height adjustment mechanism, a transmission simulation mechanism, and a control mechanism. One end of the cutter bar is rotatably connected to the mounting frame. The height adjustment mechanism is used to adjust the height of the cutter bar. The transmission simulation mechanism is used to simulate the transmission of the cutter bar in the machine. The height adjustment mechanism includes an actuator and a transmission mechanism. The actuator acts on the other end of the cutter bar through the transmission mechanism, causing the cutter bar to rotate in the vertical plane around its connection with the mounting frame.

2. The dedicated test machine according to claim 1, characterized in that, A connecting portion is provided at the tail end of the cutter bar, and a long through-hole is provided on the side surface. A relief notch is provided above the long through-hole. A U-shaped bracket is provided on the mounting frame, and the bottom edge of the U-shaped bracket is movably clamped into the long through-hole from the relief notch.

3. The dedicated test machine according to claim 1, characterized in that, The transmission simulation mechanism includes a plurality of pulleys, a first belt, a second belt, an idler pulley, a motor, and a clutch. The clutch and the idler pulley are coaxially installed on the mounting frame. The idler pulley is connected to the output end of the motor through the first belt. The second belt connects the clutch and the plurality of pulleys to achieve transmission to drive the cutter to work.

4. The special testing machine according to claim 1, characterized in that, The control mechanism includes an electrical control cabinet, an electric shock protector, a voltage converter, and a time relay. The electric shock protector is used to protect the motor and the clutch. The voltage converter is used for voltage conversion of the clutch. The time relay controls the interval time of clutch engagement. The electrical control cabinet is used to control the motor and the clutch.

5. The dedicated test machine according to claim 1, characterized in that, The transmission mechanism includes a rotating shaft, a connecting plate, a connecting rod, and a linkage mechanism. The rotating shaft is rotatably connected to the mounting frame. The axis of the rotating shaft is parallel to the rotation center line of the cutter bar. The connecting plate is fixedly connected to the rotating shaft. One end of the connecting rod is connected to the connecting plate, and the connection point is offset from the axis of the rotating shaft. The other end of the connecting rod is connected to the head end of the cutter bar. The cutter bar is located on one side of the rotating shaft. The linkage mechanism is connected between the rotating shaft and the actuator. The actuator drives the rotating shaft to rotate through the linkage mechanism.

6. The dedicated test machine according to claim 5, characterized in that, The actuator is a linear telescopic cylinder. The linkage mechanism includes a third connecting rod. One end of the third connecting rod is fixedly connected to the rotating shaft, and the other end is rotatably connected to the telescopic end of the cylinder.

7. The dedicated test machine according to claim 6, characterized in that, The linkage mechanism and the cylinder are located on the same side of the rotating shaft as the cutter bar.

8. The dedicated test machine according to claim 7, wherein The height adjustment mechanism further includes a locking mechanism. The locking mechanism includes a clamping plate, a handle, and a first connecting rod. The clamping plate is fixedly sleeved on the outside of the handle. The handle is rotatably connected to the mounting frame. A plurality of card slots are circumferentially spaced on the edge of the clamping plate, and the perpendicular distance from each card slot to the handle is different. Both ends of the first connecting rod are respectively connected to the third connecting rod and the telescopic end of the cylinder. The first connecting rod is rotatably connected to the third connecting rod. A guiding groove is provided on the side surface of the first connecting rod. A guiding member is provided in the guiding groove, and the guiding groove is in sliding fit with the guiding member. The guiding member is fixed to the mounting frame. A clamping portion cooperating with the card slot is provided on the first connecting rod.

9. The dedicated test machine according to claim 8, wherein A second connecting rod is further provided between the first connecting rod and the third connecting rod. The second connecting rod is rotatably connected to the third connecting rod.

10. The dedicated test machine according to any one of claims 5-9, characterized in that, One end of a tension spring is connected to the connecting plate, and the other end of the tension spring is connected to the mounting frame. Relative to the cutter bar and the linkage mechanism, the tension spring is located on the other side of the rotating shaft.

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