Gear tooth groove polishing circumferential positioning device

Abstract

The invention discloses a gear tooth groove polishing circumferential positioning device which comprises a base, a supporting plate is arranged at the top of the base, two fixing plates are fixedly connected between the supporting plate and the base, a positioning mechanism is arranged on one side of the top of the supporting plate, a polishing mechanism is arranged between the two fixing plates, and a positioning mechanism is arranged on one side of the top of the supporting plate. A moving mechanism is arranged on one side of the grinding mechanism, and the positioning mechanism is composed of a fixing part, a transmission part and a driving part. The fixing mechanism is arranged, the height of the gear piece arranged on the outer side of the fixing rod in a sleeving mode can be adjusted at will on the outer side of the fixing rod so that circumferential positioning can be conducted, then the gear piece at any position can be fixed by rotating the rotating base, and therefore the device is easier and more convenient to use, and meanwhile due to the fact that the extension length of the abutting rod is adjustable, the device is more convenient to use. And therefore, the gear pieces of different specifications can be fixed through the multiple abutting rods, and the application range of the device can be widened.

Description

Technical Field

[0001] The invention relates to the field of grinding circumferential positioning, and in particular to a gear tooth groove grinding circumferential positioning device. Background Art

[0002] Gears refer to mechanical components with gears on the wheel rim that continuously mesh to transmit motion and power. Gears can be divided into gear teeth, tooth grooves, end faces, normal faces, tooth top circles, tooth root circles, base circles, and pitch circles according to their structures. Commonly used steels for manufacturing gears include quenched and tempered steel, hardened steel, carburized and hardened steel, and nitrided steel. Gear grinding is a process that can further improve the accuracy and surface quality of gears after completing the basic processing of tooth profiles. During the process of gear grinding, the gear parts need to be positioned circumferentially.

[0003] The Chinese invention patent with publication number CN212443581U discloses a gear grinding device that satisfies circumferential positioning in gear teeth. Its structure includes a frame, a motor shaft, an electromagnetic shaft, an inner magnetic ring, a shaft rod, a grinding head, a connecting rod, a positioner, a limit ring, and a workbench. The workbench is fixedly connected to the frame, and an embedded motor shaft is assembled on the frame. The motor shaft joint is diametrically matched with the electromagnetic shaft, and the midpoint groove of the inner magnetic ring is clamped with the shaft rod. A limit ring is provided on the upper left side of the workbench, and the limit ring is sleeved at the lower end of the vertical connecting rod, and an adjustable positioner is provided on the connecting rod.

[0004] However, the above patent has the following shortcomings:

[0005] 1. The above patent sets a positioner to circumferentially position the gear set on the outside of the connecting rod, so that the positioning of the gear and the grinding head can be more accurate, thereby improving the grinding accuracy of the gear tooth groove. However, the connecting rod has a fixed diameter. Therefore, when gears of different specifications are set on the outside, the connecting rod cannot position the gear, thereby reducing the scope of application of the device.

[0006] 2. In the above patent, the positions of the connecting rod and the shaft rod cannot be adjusted, which results in the position between the connecting rod and the shaft rod cannot be adjusted, and further the distance between the grinding head and the fixed gear cannot be adjusted, which will cause the device to be unable to grind gears of different diameters. Summary of the invention

[0007] The purpose of the present invention is to provide a circumferential positioning device for grinding gear tooth grooves. By setting a fixing mechanism, the gear part that is set on the outside of the fixing rod can be adjusted to any height on the outside of the fixing rod to perform circumferential positioning. Thereafter, the gear part at any position can be fixed by rotating the rotating seat, thereby making the use of the device simpler and more convenient. At the same time, because the extension length of the push rod is adjustable, gear parts of different specifications can be fixed by multiple push rods, which is beneficial to improve the scope of application of the device and solve the above-mentioned deficiencies in the technology.

[0008] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gear tooth groove grinding circumferential positioning device, comprising a base, a support plate is provided on the top of the base, a fixed plate is fixedly connected between the support plate and the base, the number of the fixed plates is set to two, a positioning mechanism is provided on one side of the top of the support plate, a grinding mechanism is provided between the two fixed plates, and a moving mechanism is provided on one side of the grinding mechanism.

[0009] Preferably, the positioning mechanism consists of a fixing component, a transmission component and a driving component. The transmission component is arranged on the top of the fixing component, and the transmission component and the fixing component are coaxially distributed.

[0010] Preferably, the fixing component includes a fixing rod, the bottom of the fixing rod is rotatably connected to the support plate, the fixing rod is provided with a mounting groove inside, the mounting groove is provided with a slide groove outside, the number of the slide grooves is set to be multiple, and the multiple slide grooves are distributed around the center of the fixing rod, a threaded rod is provided inside the mounting groove, the bottom of the threaded rod is rotatably connected to the mounting groove, the top of the threaded rod passes through the fixing rod, the outer side of the threaded rod is threadedly connected with a driving sleeve, the number of the driving sleeves is set to be multiple, and the multiple driving sleeves are coaxially distributed, a push rod is slidably provided inside the slide groove, a groove is provided on one side of the push rod, a hinged rod is hingedly provided between the groove and the driving sleeve, and the hinged rod is tilted;

[0011] By rotating the threaded rod, the driving sleeve on its outer side can be driven to slide downward along its axial direction, and the driving sleeve will drive one end of the hinged rod on its outer side to move downward, and the hinged rod will rotate with the hinge point as the axis, and the other end will squeeze the inner wall of the groove, thereby driving the push rod to slide and extend outward in the slide groove, so that the gear part set on the outer side of the fixed rod can be squeezed by multiple push rods, so that the gear part can be fixed, and the gear part can slide up and down on the fixed rod to position the gear part circumferentially, and the gear part can be fixed at any position on the outer side of the push rod, and because the extension length of the push rod is adjustable, gear parts of different specifications can be fixed by multiple push rods.

[0012] Preferably, the transmission component includes a rotating seat, the rotating seat is arranged on the top of the fixing rod, the bottom of the rotating seat is fixedly connected to the threaded rod, the top of the rotating seat is provided with a first limiting groove, the outer side of the first limiting groove is provided with a through groove, the number of the through grooves is set to multiple, and the multiple through grooves are distributed around the center of the first limiting groove, a slider is slidably arranged inside the first limiting groove, a connecting rod is fixedly connected to the top of the slider, a limiting plate is fixedly connected to the top of the connecting rod, an extension rod is provided inside the through groove, and a first positioning groove is provided on the surface of the extension rod, a limiting shaft is slidably arranged inside the first positioning groove, both ends of the limiting shaft are fixedly connected to the inner wall of the through groove, and one end of the extension rod is hinged to the slider;

[0013] By pressing the limit plate, the slider can be driven downward through the connecting rod, and the slider will drive one end of the extension rod to move downward, so that the extension rod rotates and slides around the limit axis as the axis, and at the same time, one end of the extension rod will extend to the outside of the through groove. At this time, the extended extension rod can be used to easily rotate the rotating seat. When it is necessary to install a gear part to the outside of the fixed rod, the slider can be driven upward through the connecting rod by pulling the limit plate, and then the extension rod can be driven to return to its original position, so that the extension rod will not affect the installation of the gear part.

[0014] Preferably, the driving component comprises a first mounting frame, the first mounting frame is arranged between the base and the support plate, the bottom of the first mounting frame is fixedly connected to the base, a first stepper motor is arranged inside the first mounting frame, and the output shaft of the first stepper motor is drivingly connected to the fixing rod;

[0015] By starting the first stepper motor, the fixed rod can be driven to rotate, thereby driving the gear part fixed on the rotating outer side of the fixed rod to rotate, and then the angle of the gear part can be adjusted, so that the grinding mechanism can grind the outer periphery of the gear part.

[0016] Preferably, the grinding mechanism comprises a second positioning groove and a second mounting frame, the second positioning groove is arranged on the surface of the support plate, a positioning block is slidably arranged inside the second positioning groove, the second mounting frame is arranged between the support plate and the base, a second stepping motor is arranged inside the second mounting frame, the top of the second mounting frame is fixedly connected to the positioning block, a rotating shaft is rotatably arranged on the top of the positioning block, and a grinding head is arranged outside the rotating shaft;

[0017] By starting the second stepper motor, the shaft can be driven to rotate, and then the rotating shaft can drive the grinding head to rotate, and finally the rotating grinding head can be used to grind the gear part.

[0018] Preferably, the moving mechanism comprises an electric push rod and a connecting block, the number of the connecting blocks is set to two, the two connecting blocks are respectively arranged on both sides of the second installation frame, one side of the connecting block is fixedly connected to the second installation frame, the number of the electric push rods is set to two, the output ends of the two electric push rods are both transmission-connected to the connecting block, and the other end of the electric push rod is fixedly connected to the adjacent fixing plate;

[0019] By starting the electric push rod, the second mounting frame can be driven to slide through the connecting block, so that the position of the second mounting frame and the rotating shaft and the gear grinding head on its top can be adjusted, and then the distance between the gear grinding head and the fixed rod can be adjusted, so that the gear grinding head can grind gear parts of different diameters fixed on the outside of the fixed rod.

[0020] Preferably, a second limiting groove is provided on both sides of the slide groove, and limiting protrusions are provided on both sides of the push rod, the limiting protrusions are integrated with the push rod, the limiting protrusions match the second limiting grooves, and the side of the push rod away from the groove is set in an arc shape;

[0021] The limiting protrusion and the push rod can be limited by the second limiting groove, so as to prevent the push rod from being disengaged from the sliding groove. By setting one side of the push rod to be arc-shaped, the release area between the push rod and the inner wall of the gear part can be increased, which is beneficial to increase the friction between the push rod and the gear part, thereby helping to improve the fixing strength of the device.

[0022] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0023] 1. By setting a fixing mechanism, the gear part set on the outside of the fixing rod can be adjusted at any height on the outside of the fixing rod to perform circumferential positioning. Then, the gear part at any position can be fixed by rotating the rotating seat, so that the use of the device is simpler and more convenient. At the same time, because the extension length of the abutment rod is adjustable, gear parts of different specifications can be fixed by multiple abutment rods, which is conducive to improving the application range of the device;

[0024] 2. Through the cooperation of the grinding mechanism and the moving mechanism, the lateral position of the grinding head can be adjusted by the electric push rod, and then the distance between the grinding head and the fixed rod can be adjusted, so that the grinding head can grind gear parts of different diameters fixed on the outside of the fixed rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the local structure of the positioning mechanism of the present invention;

[0028] Figure 3 It is a cross-sectional structural diagram of the fixing component of the present invention;

[0029] Figure 4 It is a cross-sectional view of a transmission component of the present invention;

[0030] Figure 5 It is a top cross-sectional view of the fixing component of the present invention;

[0031] Figure 6 For the present invention Figure 3 A-section structure enlarged view.

[0032] Description of reference numerals:

[0033] 1. Base; 2. Support plate; 3. Fixed plate; 4. Positioning mechanism; 41. Fixed component; 411. Fixed rod; 412. Mounting groove; 413. Slide groove; 414. Threaded rod; 415. Drive sleeve; 416. Abutment rod; 417. Groove; 418. Articulated rod; 42. Transmission component; 421. Rotating seat; 422. First limiting groove; 423. Through groove; 424. Sliding block; 425. Connecting rod; 426. Limiting plate ; 427, extension rod; 428, first positioning groove; 429, limiting shaft; 43, driving component; 431, first mounting frame; 432, first stepping motor; 5, grinding mechanism; 51, second positioning groove; 52, second mounting frame; 53, positioning block; 54, second stepping motor; 55, rotating shaft; 56, grinding head; 6, moving mechanism; 61, electric push rod; 62, connecting block; 7, second limiting groove; 8, limiting protrusion. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The present invention provides Figure 1-6A gear tooth groove grinding circumferential positioning device shown includes a base 1, a support plate 2 is provided on the top of the base 1, a fixing plate 3 is fixedly connected between the support plate 2 and the base 1, the number of the fixing plates 3 is set to two, a positioning mechanism 4 is provided on one side of the top of the support plate 2, a grinding mechanism 5 is provided between the two fixing plates 3, and a moving mechanism 6 is provided on one side of the grinding mechanism 5.

[0036] Furthermore, in the above technical solution, the positioning mechanism 4 is composed of a fixing component 41 , a transmission component 42 and a driving component 43 . The transmission component 42 is arranged on the top of the fixing component 41 , and the transmission component 42 and the fixing component 41 are coaxially distributed.

[0037] Further, in the above technical solution, the fixing component 41 includes a fixing rod 411, the bottom of which is rotatably connected to the support plate 2, a mounting groove 412 is provided inside the fixing rod 411, a sliding groove 413 is provided outside the mounting groove 412, the number of the sliding grooves 413 is set to multiple, and the multiple sliding grooves 413 are distributed around the center of the fixing rod 411, a threaded rod 414 is provided inside the mounting groove 412, the bottom of the threaded rod 414 is rotatably connected to the mounting groove 412, the top of the threaded rod 414 is arranged through the fixing rod 411, a driving sleeve 415 is threadedly connected to the outer side of the threaded rod 414, the number of the driving sleeves 415 is set to multiple, and the multiple driving sleeves 415 are coaxially distributed, a push rod 416 is slidably provided inside the sliding groove 413, a groove 417 is provided on one side of the push rod 416, a hinged rod 418 is hingedly provided between the groove 417 and the driving sleeve 415, and the hinged rod 418 is tilted.

[0038] Further, in the above technical solution, the transmission component 42 includes a rotating seat 421, which is arranged at the top of the fixed rod 411, and the bottom of the rotating seat 421 is fixedly connected to the threaded rod 414. A first limiting groove 422 is provided at the top of the rotating seat 421, and a through groove 423 is provided on the outer side of the first limiting groove 422. The number of the through grooves 423 is set to multiple, and the multiple through grooves 423 are distributed around the center of the first limiting groove 422. A slider 424 is slidably arranged inside the first limiting groove 422, a connecting rod 425 is fixedly connected to the top of the slider 424, and a limiting plate 426 is fixedly connected to the top of the connecting rod 425. An extension rod 427 is provided inside the through groove 423, and a first positioning groove 428 is provided on the surface of the extension rod 427. A limiting shaft 429 is slidably arranged inside the first positioning groove 428, and both ends of the limiting shaft 429 are fixedly connected to the inner wall of the through groove 423, and one end of the extension rod 427 is hinged to the slider 424.

[0039] Furthermore, in the above technical solution, the driving component 43 includes a first mounting frame 431, the first mounting frame 431 is arranged between the base 1 and the support plate 2, the bottom of the first mounting frame 431 is fixedly connected to the base 1, and a first stepper motor 432 is arranged inside the first mounting frame 431, and the output shaft of the first stepper motor 432 is transmission-connected to the fixed rod 411.

[0040] Furthermore, in the above technical solution, the grinding mechanism 5 includes a second positioning groove 51 and a second mounting frame 52, the second positioning groove 51 is arranged on the surface of the support plate 2, a positioning block 53 is slidably arranged inside the second positioning groove 51, the second mounting frame 52 is arranged between the support plate 2 and the base 1, a second stepping motor 54 is arranged on the inner side of the second mounting frame 52, the top of the second mounting frame 52 is fixedly connected to the positioning block 53, a rotating shaft 55 is rotatably arranged on the top of the positioning block 53, and a grinding head 56 is arranged on the outer side of the rotating shaft 55.

[0041] Furthermore, in the above technical solution, the moving mechanism 6 includes an electric push rod 61 and a connecting block 62, the number of the connecting blocks 62 is set to two, the two connecting blocks 62 are respectively arranged on both sides of the second mounting frame 52, one side of the connecting block 62 is fixedly connected to the second mounting frame 52, the number of the electric push rods 61 is set to two, the output ends of the two electric push rods 61 are both transmission-connected to the connecting block 62, and the other end of the electric push rod 61 is fixedly connected to the adjacent fixed plate 3.

[0042] Furthermore, in the above technical solution, a second limiting groove 7 is provided on both sides of the slide groove 413, and a limiting protrusion 8 is provided on both sides of the push rod 416. The limiting protrusion 8 is integrated with the push rod 416, and the limiting protrusion 8 matches the second limiting groove 7. The side of the push rod 416 away from the groove 417 is set to be arc-shaped.

[0043] Working principle of the present invention:

[0044] Refer to the instruction manual Figure 1-6When the device is in use, the gear part is first sleeved on the outside of the fixed rod 411, and then the slider 424 can be driven to move downward through the connecting rod 425 by pressing the limit plate 426. At the same time, the slider 424 will drive one end of the extension rod 427 to move downward, so that the extension rod 427 rotates and slides around the limit shaft 429 as the axis, and at the same time, one end of the extension rod 427 will extend to the outside of the through groove 423. At this time, the extended extension rod 427 can increase the torque of the rotating seat 421, thereby facilitating the rotation of the rotating seat 421. The threaded rod 414 can be driven to rotate by rotating the rotating seat 421, and the driving sleeve 415 on the outside can be driven to slide downward along its axial direction by rotating the threaded rod 414. The movable sleeve 415 will drive one end of its outer hinge rod 418 to move downward, and the hinge rod 418 will rotate with the hinge point as the axis, and the other end will squeeze the inner wall of the groove 417, so as to drive the push rod 416 to slide and extend outward in the slide groove 413, so that the gear part set on the outer side of the fixed rod 411 can be squeezed by multiple push rods 416, so that the gear part can be fixed, and the gear part can slide up and down on the surface of the fixed rod 411 before being fixed to position the gear part circumferentially, and the gear part can be fixed at any position outside the push rod 416, and because the extension length of the push rod 416 is adjustable, gear parts of different specifications can be fixed by multiple push rods 416;

[0045] Refer to the instruction manual Figure 1-6 When the device is in use, the rotating shaft 55 can be driven to rotate by starting the second stepper motor 54, and then the grinding head 56 can be driven to rotate by the rotating rotating shaft 55, and finally the gear part can be grinded by the rotating grinding head 56. The fixed rod 411 can be driven to rotate by starting the first stepper motor 432, so that the gear part fixed on the rotating outer side of the fixed rod 411 can be driven to rotate, and then the angle of the gear part can be adjusted, so that it is convenient for the grinding mechanism 5 to grind the outer periphery of the gear part. The second mounting frame 52 can be driven to slide through the connecting block 62 by starting the electric push rod 61, so that the position of the second mounting frame 52 and the rotating shaft 55 and the grinding head 56 at the top thereof can be adjusted, and then the distance between the grinding head 56 and the fixed rod 411 can be adjusted, so that the grinding head 56 can grind gear parts of different diameters fixed on the outer side of the fixed rod 411.

[0046] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0047] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circumferential positioning device for grinding a gear tooth groove, comprising a base (1), characterized in that: A support plate (2) is provided on the top of the base (1); a fixing plate (3) is fixedly connected between the support plate (2) and the base (1); the number of the fixing plates (3) is set to two; a positioning mechanism (4) is provided on one side of the top of the support plate (2); a grinding mechanism (5) is provided between the two fixing plates (3); and a moving mechanism (6) is provided on one side of the grinding mechanism (5).

2. A circumferential positioning device for grinding gear tooth grooves according to claim 1, characterized in that: The positioning mechanism (4) is composed of a fixing component (41), a transmission component (42) and a driving component (43); the transmission component (42) is arranged on the top of the fixing component (41); and the transmission component (42) and the fixing component (41) are coaxially distributed.

3. A gear tooth groove grinding circumferential positioning device according to claim 1, characterized in that: The fixing component (41) comprises a fixing rod (411), the bottom of the fixing rod (411) is rotatably connected to the support plate (2), a mounting groove (412) is provided inside the fixing rod (411), a sliding groove (413) is provided outside the mounting groove (412), the number of the sliding grooves (413) is set to be multiple, and the multiple sliding grooves (413) are distributed around the center of the fixing rod (411), a threaded rod (414) is provided inside the mounting groove (412), and the bottom of the threaded rod (414) is rotatably connected to the mounting groove (412). The top of the threaded rod (414) passes through the fixed rod (411), the outer side of the threaded rod (414) is threadedly connected to a driving sleeve (415), the number of the driving sleeves (415) is set to be multiple, and the multiple driving sleeves (415) are coaxially distributed, and a support rod (416) is slidably arranged inside the slide groove (413), and a groove (417) is opened on one side of the support rod (416), and a hinge rod (418) is hingedly arranged between the groove (417) and the driving sleeve (415), and the hinge rod (418) is inclined.

4. A circumferential positioning device for grinding gear tooth grooves according to claim 1, characterized in that: The transmission component (42) comprises a rotating seat (421), the rotating seat (421) is arranged on the top of the fixing rod (411), the bottom of the rotating seat (421) is fixedly connected to the threaded rod (414), the top of the rotating seat (421) is provided with a first limiting groove (422), the outer side of the first limiting groove (422) is provided with a through groove (423), the number of the through grooves (423) is set to be multiple, the multiple through grooves (423) are distributed around the center of the first limiting groove (422), and the first limiting groove (422) is provided with a sliding groove inside. A block (424) is provided, the top of the slider (424) is fixedly connected with a connecting rod (425), the top of the connecting rod (425) is fixedly connected with a limiting plate (426), an extension rod (427) is provided inside the through slot (423), a first positioning slot (428) is provided on the surface of the extension rod (427), a limiting shaft (429) is slidably provided inside the first positioning slot (428), both ends of the limiting shaft (429) are fixedly connected to the inner wall of the through slot (423), and one end of the extension rod (427) is hinged to the slider (424).

5. A gear tooth groove grinding circumferential positioning device according to claim 1, characterized in that: The driving component (43) comprises a first mounting frame (431), the first mounting frame (431) being arranged between the base (1) and the support plate (2), the bottom of the first mounting frame (431) being fixedly connected to the base (1), a first stepper motor (432) being arranged inside the first mounting frame (431), and an output shaft of the first stepper motor (432) being drivingly connected to the fixing rod (411).

6. A gear tooth groove grinding circumferential positioning device according to claim 1, characterized in that: The grinding mechanism (5) comprises a second positioning groove (51) and a second mounting frame (52); the second positioning groove (51) is arranged on the surface of the support plate (2); a positioning block (53) is slidably arranged inside the second positioning groove (51); the second mounting frame (52) is arranged between the support plate (2) and the base (1); a second stepping motor (54) is arranged inside the second mounting frame (52); the top of the second mounting frame (52) is fixedly connected to the positioning block (53); a rotating shaft (55) is rotatably arranged on the top of the positioning block (53); and a grinding head (56) is arranged outside the rotating shaft (55).

7. A circumferential positioning device for grinding gear tooth grooves according to claim 1, characterized in that: The moving mechanism (6) comprises an electric push rod (61) and a connecting block (62). The number of the connecting blocks (62) is set to two. The two connecting blocks (62) are respectively arranged on both sides of the second installation frame (52). One side of the connecting block (62) is fixedly connected to the second installation frame (52). The number of the electric push rods (61) is set to two. The output ends of the two electric push rods (61) are both transmission-connected to the connecting block (62). The other end of the electric push rod (61) is fixedly connected to the adjacent fixing plate (3).

8. A gear tooth groove grinding circumferential positioning device according to claim 1, characterized in that: Second limiting grooves (7) are provided on both sides of the slide groove (413), limiting protrusions (8) are provided on both sides of the push rod (416), the limiting protrusions (8) and the push rod (416) are integrated, the limiting protrusions (8) match the second limiting grooves (7), and the side of the push rod (416) away from the groove (417) is set in an arc shape.

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