Optical glass multi-station laser positioning cutting platform

Abstract

This invention discloses a multi-station laser positioning and cutting platform for optical glass, relating to the field of laser positioning and cutting technology. It includes a support frame, a conveying and cutting unit fixedly mounted on the support frame, and a feeding unit fixedly mounted on the conveying and cutting unit. The conveying and cutting unit includes a conveying assembly fixedly mounted on the support frame and a cutting assembly slidably mounted on the conveying assembly. This invention uses the conveying assembly to move the entire glass sheet towards the cutting assembly. The cutting assembly can flexibly adjust its cutting position and angle, and can also synchronously complete multi-angle positioning and cutting through laser deflection, effectively expanding the applicability of glass cutting and meeting diverse processing needs. After cutting, the glass is conveyed to the feeding assembly, where the extrusion assembly enables immediate separation and unloading of the cut product, eliminating the need for manual operation at the processing endpoint.

Description

Technical Field

[0001] This invention relates to the field of laser positioning and cutting technology, and in particular to a multi-station laser positioning and cutting platform for optical glass. Background Technology

[0002] Glass cutting is the first step in glass processing. When processing glass lenses, the entire large sheet of glass is first laid out, and then a high-energy laser beam is generated by the laser of the cutting device and focused on the glass surface for precise positioning. Then the entire sheet of glass is cut into the required lenses. Since the size of a single lens is much smaller than that of the entire sheet of glass, the actual processing will cut multiple lenses simultaneously on a single large sheet of glass to improve the utilization rate of raw materials.

[0003] When cutting existing glass lenses, the lenses cannot be separated immediately after cutting and continue to move with the whole piece of glass. They need to be manually unloaded and separated at the end of the processing. Moreover, the laser positioning for cutting is not adjustable, and the glass needs to be adjusted to fit the cutting. This not only consumes a lot of manual time, but also interrupts the continuity of the processing flow and reduces the overall cutting efficiency. Summary of the Invention

[0004] In view of the problems existing in the current multi-station laser positioning and cutting platform for optical glass, the present invention is proposed.

[0005] Therefore, the present invention provides a multi-station laser positioning and cutting platform for optical glass, the purpose of which is to solve the problems of existing glass lens cutting processes, such as the inability to separate the lens in time after cutting, the need for manual subsequent unloading, and the inability to adjust the laser positioning, which requires adjustment of the glass to fit the cutting, which is time-consuming, interrupts the processing flow, and reduces the overall cutting efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a multi-station laser positioning and cutting platform for optical glass, including a support frame, a conveying and cutting unit fixedly installed on the support frame, and a cutting unit fixedly installed on the conveying and cutting unit; the conveying and cutting unit includes a conveying component fixedly installed on the support frame and a cutting component slidably installed on the conveying component; the cutting unit includes a cutting component rotatably installed on the conveying component and an extrusion component slidably installed on the conveying component, and the extrusion component and the cutting component are slidably connected.

[0007] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, the conveying assembly includes a fixed plate fixedly mounted on a support frame, a motor fixedly mounted on the fixed plate, a rotating shaft fixedly mounted on the output end of the motor, and a conveying cutting belt slidably mounted on the outer wall of the rotating shaft, wherein the conveying cutting belt is slidably connected to the fixed plate.

[0008] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, a reset spring is fixedly installed on the inner wall of the fixed plate, a compression ring is fixedly installed on the reset spring, and a conveying roller is rotatably installed on the compression ring.

[0009] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, a synchronous conveyor belt is fixedly installed on the outer wall of the extrusion ring, and the synchronous conveyor belt cooperates with the conveyor rollers. A movable part is fixedly installed on the extrusion ring, and the movable part is slidably connected to the fixed plate.

[0010] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, the cutting assembly includes an adjustment frame slidably mounted on a fixed plate, a drive component slidably mounted on the adjustment frame, a moving rod slidably mounted on the output end of the drive component, a limiting component fixedly mounted on the other end of the moving rod, a cutting part fixedly mounted on the inner wall of the limiting component, and a cutting head fixedly mounted on the bottom of the cutting part.

[0011] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, the cutting part includes a connecting shell fixedly installed on the inner wall of the limiting member, an S-shaped limiting groove fixedly installed on the inner wall of the connecting shell, a lens slidably installed inside the S-shaped limiting groove, a refractive ring fixedly installed on the inner wall of the connecting shell, an adjusting rod fixedly installed on the lens, a laser part fixedly installed on the connecting shell, and a moving part fixedly installed on the other end of the adjusting rod, wherein the moving part is fixedly connected to the moving rod.

[0012] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, the unloading assembly includes a second rotating shaft rotatably mounted on a fixed plate, a second conveyor cutting belt rotatably mounted on the second rotating shaft, and a synchronous belt rotatably mounted on the outer wall of the second rotating shaft, wherein the synchronous belt is connected to a motor.

[0013] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, a partition plate is fixedly installed on the inner wall of the fixed plate, and the partition plate cooperates with the conveyor rollers.

[0014] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, the extrusion assembly includes a connecting rod slidably mounted on a fixed plate, a fixed part fixedly mounted on the connecting rod, an electric push rod fixedly mounted on the fixed part, and a movable plate fixedly mounted on the output end of the electric push rod, wherein the movable plate is slidably connected to the fixed part.

[0015] As a preferred embodiment of the optical glass multi-station laser positioning and cutting platform of the present invention, a limiting chuck is fixedly installed on the inner wall of the moving plate, a second reset spring is fixedly installed on the inner wall of the limiting chuck, and a pressing component is fixedly installed on the other end of the second reset spring, and the pressing component is slidably connected to the limiting chuck.

[0016] The beneficial effects of this invention are as follows: This invention uses a conveying component to move the entire glass sheet towards the cutting component. The cutting component can flexibly adjust the cutting position and angle, and can also synchronously complete multi-angle positioning and cutting through laser deflection, effectively expanding the applicable scope of glass cutting and meeting diverse processing needs. After cutting, the glass is conveyed to the unloading component. With the help of the squeezing action of the extrusion component, the cut finished product can be separated and dropped instantly without manual operation at the processing endpoint. At the same time, the unloading component can simultaneously complete the classification and conveying of finished products and cutting waste, achieving efficient sorting of the two. Furthermore, the cutting component can autonomously adjust the cutting positioning without adjusting the glass to fit the cutting, solving the problems of the inability to separate the lens immediately after cutting and the inability to adjust the laser positioning in traditional processes, improving the overall cutting processing efficiency, and realizing automated glass cutting operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the working structure of the multi-station laser positioning and cutting platform for optical glass of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall structure of the optical glass multi-station laser positioning and cutting platform of the present invention.

[0020] Figure 3 This is a schematic diagram of the conveying unit structure of the optical glass multi-station laser positioning and cutting platform of the present invention.

[0021] Figure 4 This invention relates to a multi-station laser positioning and cutting platform for optical glass. Figure 3 Enlarged diagram of point A.

[0022] Figure 5 This is a cross-sectional structural diagram of the conveying unit of the optical glass multi-station laser positioning and cutting platform of the present invention.

[0023] Figure 6 This is a schematic diagram of the cutting unit structure of the multi-station laser positioning and cutting platform for optical glass of the present invention.

[0024] Figure 7 This is a structural diagram of the internal structure of the cutting unit of the multi-station laser positioning and cutting platform for optical glass of the present invention.

[0025] Figure 8 This is a cross-sectional structural diagram of the cutting section of the multi-station laser positioning and cutting platform for optical glass of the present invention.

[0026] Figure 9 This is a schematic diagram of the unloading component structure of the multi-station laser positioning and cutting platform for optical glass of the present invention.

[0027] Figure 10 This is a cross-sectional structural diagram of the unloading component of the multi-station laser positioning and cutting platform for optical glass of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Conveying and cutting unit; 21. Conveying assembly; 211. Fixing plate; 212. Motor; 213. Rotating shaft one; 214. Conveying and cutting belt one; 215. Return spring one; 216. Extrusion ring; 217. Conveying roller; 218. Synchronous conveyor belt; 219. Moving part; 22. Cutting assembly; 221. Adjusting frame; 222. Driving part; 223. Moving rod; 224. Limiting part; 225. Moving part; 226. Cutting part; 2261. Connecting shell 2262, S-shaped limiting groove; 2263, lens; 2264, refractive ring; 2265, adjusting rod; 2266, laser unit; 227, cutting head; 3, unloading unit; 31, extrusion assembly; 311, connecting rod; 312, fixing part; 313, electric push rod; 314, moving plate; 315, limiting clip; 316, second return spring; 317, extruded part; 32, unloading assembly; 321, second rotating shaft; 322, synchronous belt; 323, second conveyor cutting belt; 324, partition plate. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Example 1, referring to Figure 1 - Figure 2 The first embodiment of the present invention provides an optical glass multi-station laser positioning and cutting platform, including: a support frame 1, and a conveying and cutting unit 2 fixedly installed on the support frame 1 for completing the conveying and cutting of glass; and a unloading unit 3 fixedly installed on the conveying and cutting unit 2 for separating and conveying the cut glass.

[0031] The conveying and cutting unit 2 includes a conveying assembly 21 fixedly installed on the support frame 1, which is responsible for conveying and feeding the glass; and a cutting assembly 22 slidably installed on the conveying assembly 21, which is used to perform glass cutting operations.

[0032] Furthermore, the unloading unit 3 includes an unloading component 32 rotatably mounted on the conveying component 21 for separating the cut glass; and an extrusion component 31 slidably mounted on the conveying component 21, which is slidably connected to the unloading component 32 and can cooperate with the unloading component 32 to stably extrude the finished glass adsorbed in the glass waste.

[0033] During operation, the entire piece of glass is first placed on the conveyor cutting belt 214 inside the conveyor assembly 21. Under the conveying action of the conveyor assembly 21, the glass moves towards the bottom of the cutting assembly 22 along with the conveyor assembly 21. At the same time, the cutting assembly 22 completes the cutting preparation, starts adjusting the cutting position and angle, and starts the regular cutting process. When it is necessary to perform irregular cutting on the glass, the cutting assembly 22 can adjust the deflection angle of the internal laser to achieve multi-angle laser positioning and cutting, thereby expanding the application scenarios of glass cutting. After the cutting assembly 22 completes the cutting, the glass is conveyed by the conveyor assembly 21 to the unloading assembly 32. Subsequently, through the glass squeezing action, the glass that has been cut at the front end is separated with the cooperation of the squeezing assembly 31: the cut finished glass falls on the surface of the unloading assembly 32 and is conveyed and separated with the unloading assembly 32; the waste generated by cutting is separated by the unloading assembly 32 and conveyed to the other side, realizing the synchronous separation of the glass cutting finished product and waste. This solves the problems of the inability to separate the lens immediately after cutting and the inability to adjust the laser positioning in the traditional process, improves the overall cutting efficiency, and realizes the automated operation of glass cutting.

[0034] Example 2, refer to Figure 1 - Figure 8 This is the second embodiment of the present invention, which differs from the first embodiment in that: the conveying assembly 21 includes a fixed plate 211 fixedly installed on the support frame 1 for supporting the overall structure; a motor 212 fixedly installed on the fixed plate 211 for driving the rotation shaft 213 to rotate; the rotation shaft 213 fixedly connected to the output end of the motor 212 for connecting the conveying cutting belt 214; and the conveying cutting belt 214 slidably fitted on the outer wall of the rotation shaft 213, the conveying cutting belt 214 being slidably connected to the fixed plate 211 for placing and conveying the whole piece of glass.

[0035] Compared to Embodiment 1, the further improvement of this embodiment is that: a return spring 215 is fixedly installed on the inner wall of the fixed plate 211, the return spring 215 is connected to the extrusion ring 216, and the extrusion ring 216 is fixedly installed on the return spring 215. A conveying roller 217 is rotatably installed on the extrusion ring 216. Under the synergistic action of the return spring 215 and the extrusion ring 216, the conveying roller 217 can always be in contact with the glass surface, and cooperate with the conveying cutting belt 214 to achieve stable conveying of the glass.

[0036] Furthermore, a synchronous conveyor belt 218 is fixedly installed on the outer wall of the extrusion ring 216. The synchronous conveyor belt 218 cooperates with the conveyor rollers 217 to drive several sets of conveyor rollers 217 to rotate. A movable part 219 is fixedly installed on the extrusion ring 216. The movable part 219 is slidably connected to the fixed plate 211 to adjust the position of these sets of rotating conveyor rollers 217 so that they can cooperate with the conveyor cutting belt 214 to continue conveying glass from the other end.

[0037] Furthermore, the cutting assembly 22 includes an adjustment frame 221 slidably mounted on the fixed plate 211 for connecting the drive member 222; the drive member 222 slidably mounted on the adjustment frame 221 for performing cutting movement; a moving rod 223 slidably connected to the output end of the drive member 222 for cooperating with the drive member 222 for cutting adjustment; a limiting member 224 fixedly mounted on the other end of the moving rod 223 for limiting the cutting part 226; the cutting part 226 fixedly mounted on the inner wall of the limiting member 224 for cutting adjustment of the glass; and a cutting head 227 fixedly mounted on the bottom of the cutting part 226 for laser positioning and cutting of the glass.

[0038] Furthermore, the cutting section 226 includes a connecting shell 2261 fixedly installed on the inner wall of the limiting member 224 for connecting the moving rod 223; an S-shaped limiting groove 2262 fixedly opened on the inner wall of the connecting shell 2261 for limiting the movement of the lens 2263, causing the lens 2263 to rotate during movement; a lens 2263 slidably installed inside the S-shaped limiting groove 2262 for focusing the laser; a refractive ring 2264 fixedly installed on the inner wall of the connecting shell 2261 for adjusting the angle of the light; an adjusting rod 2265 fixedly installed on the lens 2263 for driving the lens 2263 to move; a laser section 2266 fixedly installed on the connecting shell 2261 for generating laser beams; and a moving section 225 fixedly installed on the other end of the adjusting rod 2265, the moving section 225 being fixedly connected to the moving rod 223 for driving the adjusting rod 2265 and the lens 2263 to move.

[0039] During use, firstly, the entire piece of glass is placed on top of the conveyor cutting belt 214. At this time, the conveyor roller 217 is in close contact with the top of the glass under the cooperation of the extrusion ring 216 and the return spring 215. Subsequently, the conveyor cutting belt 214 moves under the drive of the motor 212 and the rotating shaft 213. The glass moves synchronously with the conveyor cutting belt 214, and at the same time, the conveyor roller 217 starts to rotate to cooperate with the movement of the glass, thus completing the glass conveying and feeding.

[0040] When the glass moves to the bottom of the moving rod 223, the adjusting frame 221, in conjunction with the driving component 222, completes the cutting position adjustment on the fixed plate 211. At the same time, the moving rod 223 drives the limiting component 224 to adjust its height. Under the coordinated action of the cutting part 226 and the limiting component 224, the conventional laser positioning and cutting operation begins on the entire piece of glass at the top of the limiting component 224. If it is necessary to cut the glass into irregular or polygonal shapes, the moving part 225 drives the adjusting rod 2265 inside the connecting shell 2261 to move. During the movement of the adjusting rod 2265, the lens 2263 moves synchronously along the S-shaped limiting component. The trajectory of the positioning groove 2262 moves; due to the S-shaped structure of the S-shaped limiting groove 2262, the lens 2263 will flip and move. By flipping and adjusting the distance and angle of the lens 2263, the laser generated by the laser unit 2266 is focused and the angle is adjusted; the focused and adjusted laser shines on the refraction ring 2264, and the angle of the refraction ring 2264 deflects the laser, causing the laser to be displaced and adjusted, thereby realizing the adjustment of the light focusing intensity and cutting position. At the same time, it works with the cutting head 227 to complete multi-angle cutting, and the cutting accuracy after laser positioning is further improved with the help of the moving rod 223.

[0041] The remaining structure is the same as that in Example 1.

[0042] Example 3, referring to Figure 1 - Figure 10 This is the third embodiment of the present invention, which differs from the second embodiment in that: the unloading assembly 32 includes a second rotating shaft 321 rotatably mounted on the fixed plate 211 for driving the second conveyor cutting belt 323 to rotate; the second conveyor cutting belt 323 rotatably mounted on the second rotating shaft 321 for conveying the finished glass after cutting; and a synchronous belt 322 rotatably mounted on the outer wall of the second rotating shaft 321, which is connected to the motor 212 for driving the second rotating shaft 321 to rotate.

[0043] Compared to Embodiment 2, this embodiment further includes a partition plate 324 fixedly installed on the inner wall of the fixed plate 211. The partition plate 324 cooperates with the conveying roller 217 to separate the waste generated during cutting.

[0044] Furthermore, the extrusion assembly 31 includes a connecting rod 311 slidably mounted on the fixed plate 211 for moving and adjusting on the fixed plate 211; a fixing part 312 fixedly mounted on the connecting rod 311 for connecting an electric push rod 313; an electric push rod 313 fixedly mounted on the fixing part 312 for driving a moving plate 314 to move up and down; and a moving plate 314 fixedly mounted on the output end of the electric push rod 313, the moving plate 314 being slidably connected to the fixing part 312 for driving the limiting retainer 315 to move.

[0045] Furthermore, a limiting clip 315 is fixedly installed on the inner wall of the moving plate 314 for connecting the second reset spring 316; the second reset spring 316 is fixedly installed on the inner wall of the limiting clip 315, and a pressing member 317 is fixedly installed on the other end of the second reset spring 316, and the pressing member 317 is slidably connected to the limiting clip 315. With the cooperation of the limiting clip 315 and the second reset spring 316, the pressing member 317 can adhere to the cut glass surface; through the slight vibration of the second reset spring 316, the finished product that has been cut inside the glass falls onto the top of the second conveyor cutting belt 323 for conveying.

[0046] The process is as follows: First, the glass cut by the cutting assembly 22, along with the remaining waste, is conveyed to the top of the second conveyor cutting belt 323. Through the connection between the synchronous belt 322 and the motor 212, the rotating shaft 321 synchronously drives the second conveyor cutting belt 323 to move, allowing the glass to be directly inserted into the partition plate 324. Subsequent cut glass pieces compress the previous piece, pushing it to move within the partition plate 324. Simultaneously, the electric push rod 313 extends, driving the moving plate 314 within the fixed part 312 to move downwards, causing the limiting catch 315 within the moving plate 314 to move synchronously. The extruder 317 is attached to the top of the glass. When the glass moves, it rubs against the extruder 317. Under the action of the return spring 316, the extruder 317 vibrates up and down in the limiting clip 315. Combined with gravity, the finished glass product that has been cut falls from inside the waste material to the top of the conveyor cutting belt 323. The conveyor cutting belt 323 collects and transports the finished glass. The separator 324 transports and separates the waste material remaining after cutting, thereby completing the separation of waste material and finished product. This eliminates the need for manual operation at the processing end point. The unloading component can simultaneously complete the classification and transportation of finished product and cutting waste material, achieving efficient sorting of both.

[0047] The remaining structure is the same as that in Example 2.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-station laser positioning and cutting platform for optical glass, characterized in that: It includes a support frame (1), a conveying and cutting unit (2) fixedly installed on the support frame (1), and a feeding unit (3) fixedly installed on the conveying and cutting unit (2). The conveying and cutting unit (2) includes a conveying assembly (21) fixedly mounted on a support frame (1) and a cutting assembly (22) slidably mounted on the conveying assembly (21). The unloading unit (3) includes an unloading component (32) rotatably mounted on the conveying component (21) and an extrusion component (31) slidably mounted on the conveying component (21), and the extrusion component (31) and the unloading component (32) are slidably connected.

2. The optical glass multi-station laser positioning and cutting platform according to claim 1, characterized in that: The conveying assembly (21) includes a fixed plate (211) fixedly mounted on a support frame (1), a motor (212) fixedly mounted on the fixed plate (211), a rotating shaft (213) fixedly mounted on the output end of the motor (212), and a conveying cutting belt (214) slidably mounted on the outer wall of the rotating shaft (213), and the conveying cutting belt (214) is slidably connected to the fixed plate (211).

3. The optical glass multi-station laser positioning and cutting platform according to claim 2, characterized in that: A reset spring (215) is fixedly installed on the inner wall of the fixed plate (211), and a compression ring (216) is fixedly installed on the reset spring (215). A conveying roller (217) is rotatably installed on the compression ring (216).

4. The optical glass multi-station laser positioning and cutting platform according to claim 3, characterized in that: A synchronous conveyor belt (218) is fixedly installed on the outer wall of the extrusion ring (216), and the synchronous conveyor belt (218) cooperates with the conveyor roller (217). A movable part (219) is fixedly installed on the extrusion ring (216), and the movable part (219) is slidably connected to the fixed plate (211).

5. The optical glass multi-station laser positioning and cutting platform according to claim 4, characterized in that: The cutting assembly (22) includes an adjustment frame (221) slidably mounted on a fixed plate (211), a drive member (222) slidably mounted on the adjustment frame (221), a moving rod (223) slidably mounted on the output end of the drive member (222), a limiting member (224) fixedly mounted on the other end of the moving rod (223), a cutting part (226) fixedly mounted on the inner wall of the limiting member (224), and a cutting head (227) fixedly mounted on the bottom of the cutting part (226).

6. The optical glass multi-station laser positioning and cutting platform according to claim 5, characterized in that: The cutting part (226) includes a connecting shell (2261) fixedly installed on the inner wall of the limiting member (224), an S-shaped limiting groove (2262) fixedly installed on the inner wall of the connecting shell (2261), a lens (2263) slidably installed inside the S-shaped limiting groove (2262), a refractive ring (2264) fixedly installed on the inner wall of the connecting shell (2261), an adjusting rod (2265) fixedly installed on the lens (2263), a laser part (2266) fixedly installed on the connecting shell (2261), and a moving part (225) fixedly installed on the other end of the adjusting rod (2265), and the moving part (225) is fixedly connected to the moving rod (223).

7. The optical glass multi-station laser positioning and cutting platform according to claim 6, characterized in that: The feeding assembly (32) includes a second rotating shaft (321) rotatably mounted on a fixed plate (211), a second conveyor cutting belt (323) rotatably mounted on the second rotating shaft (321), and a synchronous belt (322) rotatably mounted on the outer wall of the second rotating shaft (321), and the synchronous belt (322) is connected to the motor (212).

8. The optical glass multi-station laser positioning and cutting platform according to claim 7, characterized in that: A partition plate (324) is fixedly installed on the inner wall of the fixed plate (211), and the partition plate (324) cooperates with the conveyor roller (217).

9. The optical glass multi-station laser positioning and cutting platform according to claim 8, characterized in that: The extrusion assembly (31) includes a connecting rod (311) slidably mounted on a fixed plate (211), a fixed part (312) fixedly mounted on the connecting rod (311), an electric push rod (313) fixedly mounted on the fixed part (312), and a movable plate (314) fixedly mounted on the output end of the electric push rod (313), wherein the movable plate (314) is slidably connected to the fixed part (312).

10. The optical glass multi-station laser positioning and cutting platform according to claim 9, characterized in that: A limit holder (315) is fixedly installed on the inner wall of the movable plate (314). A second reset spring (316) is fixedly installed on the inner wall of the limit holder (315). A pressing member (317) is fixedly installed on the other end of the second reset spring (316), and the pressing member (317) is slidably connected to the limit holder (315).

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