Dial gauge self-checking device based on contrast test method

Abstract

The invention relates to the technical field of measuring tools, and particularly discloses a dial gauge self-checking device based on a contrast test method. The linear guide rail box is arranged in the shell; through an integrated transmission chain of the moving block, the spring rod, the extension mechanism, the moving rack, the rotating gear, the worm, the worm gear, the rotating ring and the limiting piece, the device can be matched with a dial gauge push rod with the circumferential diameter within the range of 8-15 mm without replacing a clamp, and the device is convenient to use and high in practicability. The moving block directly receives the diameter difference displacement of the pushing rod, the spring rod absorbs impact and transmits the displacement, the extension mechanism amplifies the displacement and then drives the rack, the gear, the worm and the worm wheel to conduct transmission, finally the limiting piece is pushed through the rotating ring to clamp the pushing rod, adjustment is only needed through the pushing screw rod in the adaptation process, and clamp disassembly and assembly errors do not exist. The consistency of control test conditions is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of measuring tools, in particular to a dial gauge self-checking device based on a contrast test method. BACKGROUND

[0002] As precision measuring instruments, dial gauges (such as percent gauges and thousandth gauges) are widely used in mechanical processing, equipment calibration and other fields, and their indication accuracy needs to be periodically self-checked by a "contrast test method" - that is, by synchronously measuring the same displacement by a standard dial gauge and a measured dial gauge, and comparing the indication deviations of the two to judge the precision of the measured gauge.

[0003] Dial gauge push rods have various specifications (commonly φ8-φ15mm), and traditional self-checking tools need to replace fixed clamps of corresponding specifications to adapt to push rods of different diameters. The single clamp disassembly and assembly takes 3-5 minutes, and assembly errors are easily introduced during the disassembly and assembly process, which violates the core requirement of "same measurement conditions" of the contrast test. If an accident such as a knock or a fall occurs during the use period, the internal gears are mismatched, causing indication errors, return errors and other problems, which cannot be easily detected by external observation, and continued use may cause quality accidents. Therefore, we propose a dial gauge self-checking device based on a contrast test method. SUMMARY

[0004] The present application aims to provide a dial gauge self-checking device based on a contrast test method to solve the problems of replacing fixed clamps of corresponding specifications to adapt to push rods of different diameters, and the inconvenience of detecting through external observation during the use period if an accident such as a knock or a fall occurs, which may cause quality accidents.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a dial gauge self-checking device based on a contrast test method, comprising: a shell; Further comprising: a linear guide box arranged inside the shell; A moving block is fixedly connected at one end with a spring rod, one end of the spring rod is provided with an extension mechanism, one end of the extension mechanism is provided with a moving rack, the teeth of the moving rack are engaged with a rotating gear, the moving block moves by pushing the moving rack through the amplification mechanism, thereby driving the rotating gear to rotate; A worm is rotatably connected inside the rotating gear, the teeth of the worm are engaged with a worm wheel, one end of the worm wheel is provided with a rotating ring, the inside of the rotating ring is slidably connected with a limiting piece, the worm is driven by the rotating gear, and the limiting piece is moved by the worm wheel and the rotating ring.

[0006] The elongation mechanism comprises a first piston rod slidingly connected in the spring rod, the surface of the first piston rod is slidingly connected with a first fixed tube, one end of the first fixed tube is fixedly connected with a first connecting tube, one end of the first connecting tube is fixedly connected with a temporary storage tube, the inside of the temporary storage tube is slidingly connected with a moving slider, one end of the moving slider is fixedly connected with a second connecting tube, one end of the second connecting tube is fixedly connected with a second fixed tube, the inside of the second fixed tube is slidingly connected with a second piston rod, and the moving rack is fixedly connected to one end of the second piston rod.

[0007] The inside of the shell and the linear guide rail box is provided with a placing groove matched with the amplification mechanism.

[0008] One end of the worm wheel is fixedly connected with a connecting rod, and the connecting rod is fixedly connected to one end of the rotating ring.

[0009] The limiting member comprises a contact block and a moving rod, and the moving rod is fixedly connected to one end of the contact block.

[0010] One end of the contact block is slidingly connected with a limiting ring, the limiting ring is fixedly connected in the inside of the linear guide rail box, the surface of the limiting ring is provided with a first sliding groove matched with the contact block, the surface of the rotating ring is provided with an arc-shaped groove, and the cross-sectional dimension of the arc-shaped groove is matched with the moving rod.

[0011] The top of the linear guide rail box is provided with a magnetic attraction magnet fixing hole, the inside of the linear guide rail box is slidingly connected with a linear bearing, the inside of the linear bearing is slidingly connected with an optical axis rod, one end of the optical axis rod is fixedly connected with a Y-shaped transmission rod, the bottom of the Y-shaped transmission rod is slidingly connected with a first positioning sliding rail, and the first positioning sliding rail is slidingly connected in the inside of the shell.

[0012] One end of the Y-shaped transmission rod is fixedly connected with a first fixed hook, the inside of the fixed hook is clamped with a stretching spring, one end of the stretching spring is clamped with a second fixed hook, and the second fixed hook is fixedly connected in the inside of the shell.

[0013] The inside of the shell is threadedly connected with a propelling screw, one side of the inside of the shell close to the propelling screw is fixedly connected with a limiting nut, and the inside of the limiting nut is provided with a threaded groove matched with the propelling screw.

[0014] The top of the shell is fixedly connected with an upper cover, the bottom of the upper cover is fixedly connected with a second positioning sliding rail, and the second positioning sliding rail is matched with the Y-shaped transmission rod.

[0015] The present application has at least the following advantages: This invention utilizes an integrated transmission chain consisting of a moving block, a spring rod, an extension mechanism, a moving rack, a rotating gear, a worm, a worm wheel, a rotating ring, and a limiting component. This allows for the adaptation of indicator push rods with a circumferential diameter of 8-15mm without the need to change the fixture. The moving block directly receives the diameter difference displacement of the push rod, the spring rod absorbs the impact and transmits the displacement, the extension mechanism amplifies the displacement and drives the rack, gear, worm, and worm wheel transmission, and finally the rotating ring pushes the limiting component to clamp the push rod. The adaptation process only requires adjustment via the push screw, and there are no fixture disassembly or assembly errors, ensuring consistency of the control test conditions. This invention utilizes a multi-stage transmission structure consisting of a first piston rod, a first fixed tube, a temporary storage tube, a movable slider, a second connecting tube, and a second piston rod within the elongation mechanism. By taking advantage of the difference in cross-sectional area between the first and second piston rods, amplifying minute displacements, the movable rack is sufficient to drive the rotating gear to rotate stably. Combined with the precise meshing of the worm and worm wheel, this ensures that the extension accuracy of the limiting component is ≤0.002mm, laying the foundation for subsequent measurement accuracy. This invention connects the top cover to the linear guide box. The top cover uses neodymium iron boron magnets to be attracted and connected to the magnetic fixing holes of the linear guide box, replacing the traditional screw fixing. This greatly shortens the time for disassembling and assembling the top cover and significantly improves the maintenance and calibration efficiency of the internal modules. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional second-view structure of the present invention; Figure 3 This is a top view cross-sectional structural diagram of the linear guide box of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the worm gear of the present invention; Figure 5 This is a schematic diagram of the three-dimensional second-view structure of the worm gear of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the movable block of the present invention; Figure 7 This is a three-dimensional structural diagram of the elongation mechanism of the present invention.

[0017] In the diagram: 1. Housing; 2. Linear guide box; 3. Moving block; 4. Spring rod; 5. Extension mechanism; 51. First piston rod; 52. First fixed tube; 53. First connecting tube; 54. Temporary storage tube; 55. Moving slider; 56. Second connecting tube; 57. Second fixed tube; 58. Second piston rod; 6. Moving rack; 7. Rotating gear; 8. Worm gear; 9. Worm wheel; 10. Rotating ring; 11. Limiting component; 111. Abutting block; 112. Moving rod; 12. Connecting rod; 13. Limiting ring; 14. Arc groove; 15. Magnetic fixing hole; 16. Linear bearing; 17. Optical shaft rod; 18. Y-type transmission rod; 19. First positioning slide rail; 20. First fixed hook; 21. Tension spring; 22. Second fixed hook; 23. Push screw; 24. Limiting nut; 25. Top cover; 26. Second positioning slide rail. Detailed Implementation

[0018] 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.

[0019] Example 1 Please see Figures 1 to 7 The present invention provides a technical solution: a self-testing device for an indicator based on a control test method, comprising: a housing 1; It also includes: linear guide box 2, which is disposed inside the housing 1; The movable block 3 has a spring rod 4 fixedly connected to one end. The spring rod 4 has an extension mechanism 5 at one end and a movable rack 6 at one end. A rotating gear 7 meshes between the teeth of the movable rack 6. The movable block 3 pushes the movable rack 6 to move through the amplification mechanism, thereby driving the rotating gear 7 to rotate. The worm 8 is rotatably connected inside the rotating gear 7. The teeth of the worm 8 mesh with a worm wheel 9. One end of the worm wheel 9 is provided with a rotating ring 10. A limiting member 11 is slidably connected inside the rotating ring 10. The worm 8 is driven by the rotating gear 7, and the limiting member 11 is moved by the worm wheel 9 and the rotating ring 10.

[0020] The housing 1 serves as the installation reference and protective carrier for the overall structure. It has two key internal structures: one is to provide a fixing cavity for the linear guide box 2 to ensure that the guide box and the indicator are coaxial in installation position; the other is to provide a placement slot that matches the extension mechanism 5 to limit the displacement direction of the extension mechanism 5 and avoid diameter matching errors caused by component misalignment. At the same time, the side of the housing 1 provides threaded mounting holes for the push screw 23, and the top provides a fixing surface for the top cover 25. The overall rigidity ensures no deformation during diameter adjustment and transmission. One end of the movable block 3 is in direct contact with the indicator push rod, and the other end is fixed with the spring rod 4. When the circumference diameter of the indicator push rod is different, the contact depth of the push rod with the movable block 3 is different, which causes the movable block 3 to produce differentiated horizontal displacement. This is the starting point for the conversion from diameter difference to displacement signal. The spring rod 4 contains a pre-compressed spring and integrates a telescopic rod in the middle. On the one hand, it absorbs the instantaneous contact force of the movable block 3 to avoid component impact caused by sudden diameter change. On the other hand, it smoothly transmits the small displacement of the movable block 3 to the first piston rod 51 of the extension mechanism 5 through the telescopic rod in the middle, ensuring uniform force transmission. The movable rack 6 is fixed to the end of the second piston rod 58 and moves horizontally synchronously with the second piston rod 58. The teeth mesh precisely with the rotating gear 7, converting the amplified linear displacement of the extension mechanism 5 into the rotational motion of the rotating gear 7, realizing the conversion of the transmission direction from linear to rotational. The rotating gear 7 is connected to and fixed with the worm 8 through a key. It rotates synchronously with the movement of the rack and transmits the rotational motion to the worm 8, providing power for the subsequent transmission of worm wheel 9-rotating ring 10. It is the transfer hub of diameter-adaptive transmission. The worm 8 is fixedly connected inside the rotating gear 7. The tooth profile is that of an Archimedean worm 8, and the teeth mesh with the worm wheel 9. It converts the horizontal axis rotation of the rotating gear 7 into the vertical axis rotation of the worm wheel 9, changing the transmission direction to match the installation position of the rotating ring 10. The worm wheel 9 is fixed to the connecting rod 12 by a flat key. The other end of the connecting rod 12 is welded to the rotating ring 10. When the worm wheel 9 rotates with the worm 8, it drives the rotating ring 10 to rotate synchronously through the connecting rod 12, transmitting the rotational motion to the limiting member 11. The rotating ring 10 has an arc-shaped groove 14 on its surface. It rotates synchronously with the worm wheel 9. When rotating, it pushes the moving rod 112 to slide along the groove through the side wall of the arc-shaped groove 14, converting the rotational motion back into the linear displacement of the limiting member 11. It is the final power output component with diameter matching.

[0021] The elongation mechanism 5 includes a first piston rod 51 slidably connected inside the spring rod 4. A first fixing tube 52 is slidably connected to the surface of the first piston rod 51. A first connecting tube 53 is fixedly connected to one end of the first fixing tube 52. A temporary storage tube 54 is fixedly connected to one end of the first connecting tube 53. A movable slider 55 is slidably connected inside the temporary storage tube 54. A second connecting tube 56 is fixedly connected to one end of the movable slider 55. A second fixing tube 57 is fixedly connected to one end of the second connecting tube 56. A second piston rod 58 is slidably connected inside the second fixing tube 57. A movable rack 6 is fixedly connected to one end of the second piston rod 58.

[0022] The extension mechanism 5 is key to amplifying minute displacements, solving the problem of insufficient displacement due to diameter differences, which prevents the drive of subsequent transmission components. The telescopic rod of the spring rod 4 pushes the first piston rod 51, which slides along the first fixed tube 52, transmitting the thrust through the first connecting tube 53 to the movable slider 55 in the temporary storage tube 54. The movable slider 55 slides along the temporary storage tube 54, pushing the second piston rod 58 to extend along the second fixed tube 57 through the second connecting tube 56. The second piston rod 58 drives the movable rack 6 to move. By comparing the cross-sectional area ratio of the first piston rod 51 to the second piston rod 58, the movable rack 6 is ensured to have sufficient stroke to drive the rotating gear 7.

[0023] Both the housing 1 and the linear guide box 2 have placement slots inside that are adapted to the extension mechanism 5.

[0024] The placement slots are respectively opened inside the housing 1 and the linear guide box 2 for embedding and installing the extension mechanism 5. The rigid constraint of the slot wall ensures that the axes of all components of the extension mechanism 5 are coaxial, avoiding transmission offset caused by vibration or assembly error, and ensuring the stability of the enlargement ratio of the diameter matching.

[0025] One end of the worm gear 9 is fixedly connected to a connecting rod 12, which is fixedly connected to one end of the rotating ring 10.

[0026] The limiting member 11 includes an abutment block 111 and a moving rod 112, with the moving rod 112 fixedly connected to one end of the abutment block 111.

[0027] The limiting component 11 consists of a contact block 111 and a moving rod 112. One end of the moving rod 112 is welded to the contact block 111, and the other end is inserted into the arc groove 14 of the rotating ring 10. The contact block 111 eventually contacts the outer periphery of the indicator push rod. By adjusting the extension length, the effective fitting diameter inside the linear guide box 2 is made consistent with the diameter of the indicator push rod.

[0028] One end of the contact block 111 is slidably connected to a limiting ring 13, which is fixedly connected inside the linear guide box 2. The surface of the limiting ring 13 is provided with a first sliding groove that matches the contact block 111. The surface of the rotating ring 10 is provided with an arc-shaped groove 14, the cross-sectional dimension of which matches the moving rod 112.

[0029] The limiting ring 13 is fixed inside the linear guide box 2 by screws, and a first sliding groove adapted to the contact block 111 is opened on its surface. The limiting ring 111 moves only in the horizontal direction of the indicator push rod, so as to prevent the contact block 111 from being offset due to the swing of the rotating ring 10, and to ensure that the push rods of indicators of different diameters can be coaxially clamped by the contact block 111.

[0030] The top of the linear guide box 2 is provided with a magnetic magnet fixing hole 15. A linear bearing 16 is slidably connected inside the linear guide box 2. A light shaft rod 17 is slidably connected inside the linear bearing 16. A Y-shaped transmission rod 18 is fixedly connected to one end of the light shaft rod 17. A first positioning slide rail 19 is slidably connected to the bottom of the Y-shaped transmission rod 18. The first positioning slide rail 19 is slidably connected inside the housing 1.

[0031] The linear guide box 2 is fixed inside the housing 1, with a magnetic fixing hole 15 on the top. The interior provides a precision mounting cavity for the linear bearing 16. The rigid constraint of the box ensures that the linear bearing 16 slides only in the horizontal direction, preventing transmission offset caused by deformation of the housing 1. It also provides a fixing reference for the limiting ring 13. The linear bearing 16 is made of precision grade, with an inner hole fitting accuracy g6 with the optical shaft 17, and a sliding friction force ≤5N, eliminating radial wobbling of the optical shaft 17 and ensuring no horizontal displacement of the Y-type transmission rod 18. One end of the optical shaft 17 is welded to the Y-type transmission rod 18, and the other end runs along the linear bearing... 16. Sliding: The horizontal displacement of the Y-type transmission rod 18 is converted into backlash-free linear motion, ensuring that the thrust of the Y-type transmission rod 18 on the standard and the probe of the measured indicator is completely consistent. The two contact points at the top of the Y-type transmission rod 18 correspond to the standard and the probe of the measured indicator, and the single thrust of the push screw 23 is synchronously decomposed into two uniform thrusts to ensure that the displacements of the two indicator probes are completely identical. The first positioning slide rail 19 is fixed inside the housing 1 by screws and is adapted to the slider at the bottom of the Y-type transmission rod 18 to limit the left and right offset of the Y-type transmission rod 18. It works with the second positioning slide rail 26 of the upper cover 25 to form a double upper and lower guide.

[0032] One end of the Y-shaped transmission rod 18 is fixedly connected to a first fixed hook 20. A tension spring 21 is engaged inside the fixed hook. One end of the tension spring 21 is engaged to a second fixed hook 22. The second fixed hook 22 is fixedly connected inside the housing 1.

[0033] The first fixed hook 20 is welded to one end of the Y-shaped transmission rod 18, with the hook opening facing the inside of the housing 1. It is used to engage the tension spring 21. One end of the tension spring 21 is engaged with the first fixed hook 20, and the other end is engaged with the second fixed hook 22. When the push screw 23 pushes the Y-shaped transmission rod 18 forward, the spring is stretched and stores elastic potential energy. When the screw retracts, the spring releases its potential energy and pulls the Y-shaped transmission rod 18 back to its original position. At the same time, the tension of the spring counteracts the slight oscillation of the Y-shaped transmission rod 18 caused by the torque of the push screw 23. The second fixed hook 22 is welded to the inner side wall of the housing 1, and its position corresponds to the first fixed hook 20.

[0034] The housing 1 is internally threaded with a push screw 23. A limit nut 24 is fixedly connected to the inside of the housing 1 near the push screw 23. The limit nut 24 has a threaded groove inside that is compatible with the push screw 23.

[0035] One end of the push screw 23 extends out of the housing 1 and integrates a knob, while the other end abuts against the Y-shaped transmission rod 18 through a spherical contact. When rotated clockwise, the rotational motion is converted into horizontal thrust through threaded transmission, which is the power source of the self-testing tool. The limit nut 24 is made of 45 steel and is fixed inside the housing 1 near the push screw 23 by welding. The internal thread is adapted to the screw, which on the one hand restricts the radial swing of the screw and ensures that the thrust is transmitted in the horizontal direction, and on the other hand, through the self-locking characteristic of the thread, prevents the screw from retracting due to vibration during the measurement process, thus ensuring measurement stability.

[0036] The top of the housing 1 is fixedly connected to the top cover 25, and the bottom of the top cover 25 is fixedly connected to the second positioning slide rail 26, which is adapted to the Y-shaped transmission rod 18.

[0037] The bottom of the top cover 25 is fixed with a second positioning slide rail 26 by screws. On the one hand, it isolates external dust and impurities from entering the interior and avoids wear on the linear bearing 16 and optical shaft 17. On the other hand, the second positioning slide rail 26 and the first positioning slide rail 19 form a double constraint, further limiting the vertical offset of the Y-shaped transmission rod 18.

[0038] Example 2 In this second embodiment, the other structures remain unchanged. The difference from the first embodiment is that the upper cover 25 has a placement groove inside that matches the magnetic magnet fixing hole 15. The magnetic magnet fixing hole 15 is connected to an external magnetic magnet inside the placement groove, so that the upper cover 25 is connected to the housing 1.

[0039] The top cover 25 has a slot inside that matches the magnetic magnet fixing hole 15. After the external magnetic magnet is placed in the slot, it will be attracted and connected to the magnetic magnet fixing hole 15 of the linear guide box 2. Compared with the traditional screw fixing, the magnetic connection can shorten the disassembly and assembly time of the top cover 25 from 5 minutes to 30 seconds, which is convenient for the maintenance and calibration of the internal diameter matching module.

[0040] 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.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-testing device for an indicator based on a controlled test method, comprising: case; Its characteristic is that it further includes: a linear guide box, wherein the linear guide box is disposed inside the housing; A movable block, one end of which is fixedly connected to a spring rod, one end of which is provided with an extension mechanism, and one end of which is provided with a movable rack. A rotating gear meshes between the teeth of the movable rack. The movable block drives the movable rack to move through an amplification mechanism, thereby driving the rotating gear to rotate. A worm gear is rotatably connected inside a rotating gear. A worm wheel meshes between the teeth of the worm gear. A rotating ring is provided at one end of the worm wheel. A limiting member is slidably connected inside the rotating ring. The worm gear is driven by the rotating gear and moves the limiting member through the worm wheel and the rotating ring.

2. The indicator self-testing device based on the control test method according to claim 1, characterized in that: The elongation mechanism includes a first piston rod slidably connected inside a spring rod, a first fixed tube slidably connected to the surface of the first piston rod, a first connecting tube fixedly connected to one end of the first fixed tube, a temporary storage tube fixedly connected to one end of the first connecting tube, a movable slider slidably connected inside the temporary storage tube, a second connecting tube fixedly connected to one end of the movable slider, a second fixed tube fixedly connected to one end of the second connecting tube, a second piston rod slidably connected inside the second fixed tube, and a movable rack fixedly connected to one end of the second piston rod.

3. The indicator self-testing device based on the control test method according to claim 1, characterized in that: Both the housing and the linear guide box have placement slots inside that are adapted to the amplification mechanism.

4. The indicator self-testing device based on the control test method according to claim 1, characterized in that: A connecting rod is fixedly connected to one end of the worm gear, and the connecting rod is fixedly connected to one end of the rotating ring.

5. The indicator self-testing device based on the control test method according to claim 1, characterized in that: The limiting component includes an abutment block and a movable rod, with the movable rod fixedly connected to one end of the abutment block.

6. The indicator self-testing device based on the control test method according to claim 5, characterized in that: One end of the abutment block is slidably connected to a limiting ring, which is fixedly connected inside the linear guide box. The surface of the limiting ring is provided with a first sliding groove that matches the abutment block. The surface of the rotating ring is provided with an arc-shaped groove, the cross-sectional dimension of which matches the moving rod.

7. The indicator self-testing device based on the control test method according to claim 1, characterized in that: The top of the linear guide box is provided with a magnetic fixing hole. A linear bearing is slidably connected inside the linear guide box. An optical shaft is slidably connected inside the linear bearing. One end of the optical shaft is fixedly connected to a Y-shaped transmission rod. The bottom of the Y-shaped transmission rod is slidably connected to a first positioning slide rail, which is slidably connected inside the housing.

8. The indicator self-testing device based on the control test method according to claim 7, characterized in that: One end of the Y-shaped transmission rod is fixedly connected to a first fixed hook, and a tension spring is engaged inside the fixed hook. One end of the tension spring is engaged with a second fixed hook, which is fixedly connected inside the housing.

9. The indicator self-testing device based on the control test method according to claim 7, characterized in that: The housing is internally threaded with a push screw, and a limit nut is fixedly connected to the side of the housing near the push screw. The limit nut has a threaded groove inside that is compatible with the push screw.

10. The indicator self-testing device based on the control test method according to claim 7, characterized in that: The top of the housing is fixedly connected to a top cover, and the bottom of the top cover is fixedly connected to a second positioning slide rail, which is adapted to the Y-shaped transmission rod.

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