Bar flying shear mechanism capable of quickly positioning

Abstract

The utility model discloses a bar flying shear mechanism capable of quickly positioning, which relates to the technical field of flying shears and comprises a base, a flying shear main body and a positioning conveying structure, the flying shear main body and the positioning conveying structure are arranged on the base, and the positioning conveying structure is matched with the flying shear main body. The positioning conveying structure comprises a mounting frame, a pair of transmission rotating shafts, a conveying belt, a driving piece and a positioning piece; the positioning part comprises a pair of supporting arms, a mounting cross beam, a plurality of rotating sleeves and a positioning plate, the rotating sleeves are arranged below the mounting cross beam in a matched mode, the positioning plate is arranged between the mounting frame and the flying shear body and connected with the supporting arms through a pair of connecting rods, and a positioning opening for a bar to pass through is formed between every two adjacent rotating sleeves. The positioning plate is provided with a positioning groove matched with the positioning opening, and the problem that an existing bar flying shear is not provided with a bar positioning piece, and bars cannot be effectively positioned when the bars are fed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flying shears, in particular to a bar flying shear mechanism which can be quickly positioned. Background Art

[0002] A bar shear is a device used to cut metal bars. It usually consists of a scissor-like cutter and a moving workbench, which can quickly and accurately cut metal bars into the required length. This machine is commonly used in the metal processing industry, especially in the manufacturing industry to produce various parts and components. It is simple to operate and highly efficient, and can greatly improve production efficiency and product quality.

[0003] The bar shears in the prior art are generally not provided with a positioning mechanism. When feeding the bar, manual adjustment is required to feed the bar to the position of the cutter for cutting. Manual adjustment will make the cutting surface of the bar inconsistent, affecting normal use, so that the bar needs to be reprocessed and cut, which is very inconvenient.

[0004] A new type of rod and wire flying shear is disclosed in the utility model with application number: CN201620967443.2 and publication number: CN205967604U, which includes two main motors in parallel, which are connected to two input shafts of a compound shear body through a coupling, and the two input shafts of the compound shear body are provided with flywheels respectively, and the input shafts are connected to the flywheels through a single key, and the compound shear body also includes a box body, the two input shafts are located above the box body, and a shearing mechanism is provided at the lower end of the box body. However, there is still a problem that there is no bar positioning part, and the bar cannot be effectively positioned when the bar is fed. Utility Model Content

[0005] Based on this, in order to solve the above problems, the utility model proposes a bar flying shear mechanism that can be quickly positioned, which solves the problem that the current bar flying shear has no bar positioning piece and cannot effectively position the bar when feeding the bar.

[0006] The technical solution of the utility model is:

[0007] A bar flying shear mechanism capable of rapid positioning comprises a base, a flying shear body and a positioning and conveying structure, wherein the flying shear body and the positioning and conveying structure are arranged on the base, and the positioning and conveying structure is arranged in coordination with the flying shear body, and the positioning and conveying structure comprises a mounting frame, a pair of transmission shafts, a conveying belt, a driving member and a positioning member;

[0008] A pair of transmission shafts are arranged on the mounting frame and are rotatably connected to the mounting frame. The conveyor belt is sleeved on the two transmission shafts and can be driven by the pair of transmission shafts. The driving member is arranged on one side of the mounting frame, and the output shaft of the driving member passes through the mounting frame and is fixedly connected to the end of one of the transmission shafts for driving the transmission shaft. The output shaft of the driving member is rotatably connected to the mounting frame.

[0009] The positioning part includes a pair of support arms, a mounting beam, a plurality of rotating sleeves and a positioning plate. The pair of support arms are arranged on the top of the mounting frame close to the main body of the shearing machine, and are respectively located on both sides of the conveyor belt and cooperate with the conveyor belt. The mounting beam is arranged on the top of the pair of support arms. The plurality of rotating sleeves are cooperated and arranged below the mounting beam and are rotatably connected with the mounting beam. The bottom of the rotating sleeve is cooperated with the conveyor belt. The positioning plate is arranged between the mounting frame and the main body of the shearing machine, and is connected to the pair of support arms through a pair of connecting rods. A positioning opening for the passage of rods is provided between two adjacent rotating sleeves, and a positioning groove is provided on the positioning plate to cooperate with the positioning opening.

[0010] Preferably, the driving member is a rotary motor, and the driving member is mounted on the base via a mounting seat.

[0011] Preferably, the shearing machine body includes a tool structure and a driving structure, the tool structure includes an installation frame, a fixed tool, a cutting tool, a movable part and a pair of elastic reset parts, the installation frame is arranged on the base, the movable part is arranged in the installation frame, and the two ends are respectively slidably connected to the installation frame, a pair of elastic reset parts are arranged on the base, and are respectively cooperated with the two ends of the movable part, the cutting tool is arranged at the bottom of the movable part, and is detachably connected to the movable part, the fixed tool is arranged on the base, and is located in the installation frame and cooperates with the cutting tool, and the driving structure is arranged on one side of the tool structure for driving the movable part.

[0012] Preferably, one end of the positioning plate is arranged in cooperation with the fixed tool and the cutting tool.

[0013] Preferably, the movable part includes a mounting portion and sliding connecting blocks arranged on both sides of the mounting portion, sliding mounting grooves are arranged on both sides of the mounting frame, the sliding connecting blocks on both sides of the mounting portion are respectively located in the sliding mounting grooves on both sides of the mounting frame, and are slidably connected to the mounting frame, and the cutting tool is arranged at the bottom of the mounting portion and is detachably connected to the bottom of the mounting portion by bolts.

[0014] Preferably, a pair of elastic reset members are respectively arranged in the sliding installation grooves on both sides of the installation frame.

[0015] Preferably, the elastic reset member includes a telescopic rod and a reset spring, the reset spring is sleeved on the outside of the telescopic rod, one end of the telescopic rod and the reset spring is fixedly connected to the base, and the other end is connected to the sliding connection block.

[0016] Preferably, the driving structure includes a rotating shaft, a plurality of cams and a driving part. The rotating shaft is arranged in an installation frame and is rotatably connected to the installation frame. The rotating shaft is arranged above the movable part. The plurality of cams are arranged on the rotating shaft and are fixedly connected to the rotating shaft. The plurality of cams are cooperated with the installation part and are used to drive the installation part. One end of the rotating shaft passes through the installation frame and is connected to the driving part. The driving part is used to drive the rotating shaft.

[0017] Preferably, the driving part includes a worm wheel, a worm and a driving motor. The worm wheel is arranged on one side of the rotating shaft passing through the mounting frame and is fixedly connected to the rotating shaft. The worm and the worm wheel are cooperatively arranged to drive the worm wheel. The output shaft of the driving motor is fixedly connected to one end of the worm for driving the worm.

[0018] Preferably, it also includes a mounting bracket and a mounting box, the mounting bracket is arranged on the base and is arranged in coordination with the mounting frame, the mounting box is arranged on the mounting bracket, the rotating shaft passes through one end of the mounting frame, passes through the mounting box, and is rotatably connected to the mounting box, the worm gear is arranged at one end of the rotating shaft located in the mounting box, the worm is arranged in the mounting box, and is arranged in coordination with the worm gear, both ends of the worm are rotatably connected to the mounting box, and the output shaft of the driving motor passes through the mounting box and is fixedly connected to one end of the worm.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model realizes the positioning of the rod during feeding by setting a positioning and conveying structure. When in use, the rod is placed on the conveyor belt, and the driving shaft is driven by the driving member, thereby driving the conveyor belt to rotate, so that the rod moves toward the main body of the shear. By setting a plurality of rotating sleeves at one end of the conveyor belt close to the main body of the shear, and positioning openings for the plate to pass through are set between the rotating sleeves, the rod can only continue to be fed through the positioning openings, and then the rod is further limited by setting a positioning plate, so that the front end of the rod can accurately enter the main body of the shear for shearing. The utility model solves the problem that the current rod shear does not have a rod positioning member, and the rod cannot be effectively positioned when the rod is fed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a bar flying shear mechanism capable of rapid positioning described in an embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the positioning and conveying structure described in the embodiment of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the tool structure described in the embodiment of the utility model;

[0024] Figure 4It is a structural schematic diagram of the main body of the shearing machine described in the embodiment of the utility model;

[0025] Figure 5 It is a partial structural schematic diagram of the main body of the shearing machine described in the embodiment of the utility model;

[0026] Description of reference numerals:

[0027] 10-base, 20-flying shear body, 21-tool structure, 22-driving structure, 200-installation frame, 201-fixed tool, 202-cutting tool, 203-moving part, 204-elastic reset part, 205-installation part, 206-sliding connection block, 207-sliding installation groove, 208-telescopic rod, 209-reset spring, 210-rotating shaft, 211-cam, 212-driving part, 213-worm gear , 214-worm, 215-drive motor, 216-mounting bracket, 217-mounting box, 30-positioning conveying structure, 300-mounting frame, 301-transmission shaft, 302-conveyor belt, 303-driving member, 304-positioning member, 305-support arm, 306-mounting beam, 307-rotating sleeve, 308-positioning plate, 309-connecting rod, 310-positioning port, 311-positioning slot, 312-mounting seat. DETAILED DESCRIPTION

[0028] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0029] Example:

[0030] like Figure 1 to Figure 2 As shown, in order to solve the above problems, the present embodiment discloses a bar flying shear mechanism that can be quickly positioned, comprising a base 10, a flying shear machine body 20 and a positioning and conveying structure 30, the flying shear machine body 20 and the positioning and conveying structure 30 are arranged on the base 10, and the positioning and conveying structure 30 is arranged in coordination with the flying shear machine body 20, and the positioning and conveying structure 30 comprises a mounting frame 300, a pair of transmission shafts 301, a conveying belt 302, a driving member 303 and a positioning member 304;

[0031] A pair of transmission shafts 301 are arranged on the mounting frame 300 and are rotatably connected to the mounting frame 300. The conveyor belt 302 is sleeved on the two transmission shafts 301 and can be driven by the pair of transmission shafts 301. The driving member 303 is arranged on one side of the mounting frame 300, and the output shaft of the driving member 303 passes through the mounting frame 300 and is fixedly connected to the end of one of the transmission shafts 301 for driving the transmission shaft 301. The output shaft of the driving member 303 is rotatably connected to the mounting frame 300.

[0032] The positioning member 304 includes a pair of support arms 305, a mounting beam 306, a plurality of rotating sleeves 307 and a positioning plate 308. The pair of support arms 305 are arranged at the top of the mounting frame 300 close to the shearing machine body 20, and are respectively located on both sides of the conveyor belt 302 and are arranged in cooperation with the conveyor belt 302. The mounting beam 306 is arranged on the top of the pair of support arms 305. A plurality of rotating sleeves 307 are arranged in cooperation with the lower part of the mounting beam 306 and are rotatably connected with the mounting beam 306. The bottom of the rotating sleeve 307 is arranged in cooperation with the conveyor belt 302. The positioning plate 308 is arranged between the mounting frame 300 and the shearing machine body 20, and is connected to the pair of support arms 305 through a pair of connecting rods 309. A positioning opening 310 for the passage of rods is provided between two adjacent rotating sleeves 307, and a positioning groove 311 is provided on the positioning plate 308 and is arranged in cooperation with the positioning opening 310.

[0033] The utility model realizes the positioning of the rod during feeding by setting a positioning conveying structure 30. When in use, the rod is placed on the conveyor belt 302, and the driving shaft 301 is driven by the driving member 303, thereby driving the conveyor belt 302 to rotate, so that the rod moves toward the shear body 20. By setting a plurality of rotating sleeves 307 at one end of the conveyor belt 302 close to the shear body 20, and setting a positioning opening 310 for the plate to pass through between the rotating sleeves 307, the rod can only continue to feed through the positioning opening 310, and then further limit the rod by setting a positioning plate 308, so that the front end of the rod can accurately enter the shear body 20 for shearing. The utility model solves the problem that the current rod shear does not have a rod positioning member 304, and the rod cannot be effectively positioned when the rod is fed.

[0034] Preferably, the driving member 303 is a rotating motor, which is a motor in the prior art that can realize the functions of the utility model. The driving member 303 is installed on the base 10 through the mounting seat 312 to facilitate the installation of the driving member 303.

[0035] like Figure 3 to Figure 4As shown, in order to facilitate the shearing of the rod, this embodiment is modified on the basis of the above embodiment, and the difference from the above embodiment is that the shearing machine body 20 includes a tool structure 21 and a driving structure 22, the tool structure 21 includes a mounting frame 200, a fixed tool 201, a cutting tool 202, a movable member 203 and a pair of elastic reset members 204, the mounting frame 200 is arranged on the base 10, the movable member 203 is arranged in the mounting frame 200, and the two ends are respectively slidably connected to the mounting frame 200, a pair of elastic reset members 204 are arranged on the base 10, and are respectively arranged in cooperation with the two ends of the movable member 203, the cutting tool 202 is arranged at the bottom of the movable member 203, and is detachably connected to the movable member 203, the fixed tool 201 is arranged on the base 10, and is located in the mounting frame 200 and is arranged in cooperation with the cutting tool 202, and the driving structure 22 is arranged on one side of the tool structure 21 for driving the movable member 203.

[0036] Preferably, one end of the positioning plate 308 is arranged in cooperation with the fixed tool 201 and the cutting tool 202 .

[0037] like Figure 4 As shown, preferably, the movable member 203 includes a mounting portion 205 and sliding connection blocks 206 arranged on both sides of the mounting portion 205, sliding mounting grooves 207 are provided on both sides of the mounting frame 200, the sliding connection blocks 206 on both sides of the mounting portion 205 are respectively located in the sliding mounting grooves 207 on both sides of the mounting frame 200, and are slidably connected to the mounting frame 200, and the cutting tool 202 is arranged at the bottom of the mounting portion 205, and is detachably connected to the bottom of the mounting portion 205 by bolts.

[0038] Preferably, a pair of elastic return members 204 are respectively disposed in the sliding installation grooves 207 on both sides of the installation frame 200 .

[0039] Preferably, the elastic return member 204 includes a telescopic rod 208 and a return spring 209, and the return spring 209 is sleeved on the outside of the telescopic rod 208. One end of the telescopic rod 208 and the return spring 209 is fixedly connected to the base 10, and the other end is connected to the sliding connection block 206.

[0040] When in use, the driving structure 22 drives the mounting portion 205 to move downward, and the sliding connection blocks 206 at both ends of the mounting portion 205 slide downward in the sliding mounting groove 207, thereby compressing the spring set in the sliding mounting groove 207, and at the same time shortening the telescopic rod 208, and the cutting tool 202 at the bottom of the mounting portion 205 moves toward the fixed tool 201 to complete the shearing of the bar. The cutting tool 202 is detachably connected to the bottom of the mounting portion 205 by bolts, which can facilitate the replacement of the cutting tool 202.

[0041] like Figure 5As shown, in order to facilitate driving the tool structure 21, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that the driving structure 22 includes a rotating shaft 210, a plurality of cams 211 and a driving part 212. The rotating shaft 210 is arranged in the installation frame 200 and is rotatably connected to the installation frame 200. The rotating shaft 210 is arranged above the moving part 203. The plurality of cams 211 are arranged on the rotating shaft 210 and are fixedly connected to the rotating shaft 210. The plurality of cams 211 are arranged in cooperation with the installation part 205 for driving the installation part 205. One end of the rotating shaft 210 passes through the installation frame 200 and is connected to the driving part 212. The driving part 212 is used to drive the rotating shaft 210.

[0042] Preferably, the driving part 212 includes a worm wheel 213, a worm 214 and a driving motor 215. The worm wheel 213 is arranged on one side of the rotating shaft 210 that passes through the mounting frame 200 and is fixedly connected to the rotating shaft 210. The worm 214 is arranged in cooperation with the worm wheel 213 to drive the worm wheel 213. The output shaft of the driving motor 215 is fixedly connected to one end of the worm 214 to drive the worm 214.

[0043] like Figure 3 As shown, preferably, it also includes a mounting bracket 216 and a mounting box 217, the mounting bracket 216 is arranged on the base 10 and is arranged in cooperation with the mounting frame 200, the mounting box 217 is arranged on the mounting bracket 216, the rotating shaft 210 passes through one end of the mounting frame 200 and passes through the mounting box 217, and is rotatably connected to the mounting box 217, the worm gear 213 is arranged at one end of the rotating shaft 210 located in the mounting box 217, the worm 214 is arranged in the mounting box 217, and is arranged in cooperation with the worm gear 213, both ends of the worm 214 are rotatably connected to the mounting box 217, and the output shaft of the drive motor 215 passes through the mounting box 217 and is fixedly connected to one end of the worm 214.

[0044] When in use, the worm 214 is driven to rotate by the driving motor 215, which in turn drives the worm wheel 213 to rotate, which in turn drives the rotating shaft 210 fixedly connected to the turbine to rotate, and then drives the cam 211 on the rotating shaft 210 to rotate. When the protruding end of the cam 211 contacts the mounting portion 205, the mounting portion 205 moves downward. When the protruding end of the cam 211 does not contact the mounting portion 205, the mounting portion 205 is reset under the reset force of the spring.

[0045] The driving motor 215 adopts a motor in the prior art that can realize the functions of the utility model.

[0046] Working principle of this utility model:

[0047] The utility model realizes the positioning of the bar material during feeding by setting the positioning conveying structure 30. When in use, the bar material is placed on the conveyor belt 302, and the driving shaft 301 is driven by the driving member 303, thereby driving the conveyor belt 302 to rotate, so that the bar material moves toward the shearing machine body 20. By setting a plurality of rotating sleeves 307 at one end of the conveyor belt 302 close to the shearing machine body 20, and setting a positioning opening 310 for the plate material to pass through between the rotating sleeves 307, the bar material can only continue to be fed through the positioning opening 310, and then the positioning plate 308 is set to further limit the position of the bar material, so that the front end of the bar material can accurately enter the shearing machine body 20 for shearing.

[0048] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A bar flying shear mechanism capable of rapid positioning, characterized in that: The invention comprises a base (10), a shearing machine body (20) and a positioning and conveying structure (30), wherein the shearing machine body (20) and the positioning and conveying structure (30) are arranged on the base (10), and the positioning and conveying structure (30) is arranged in coordination with the shearing machine body (20), and the positioning and conveying structure (30) comprises a mounting frame (300), a pair of transmission shafts (301), a conveying belt (302), a driving member (303) and a positioning member (304); A pair of transmission shafts (301) are arranged on the mounting frame (300) and are rotatably connected to the mounting frame (300); a conveyor belt (302) is sleeved on the two transmission shafts (301) and can be driven by the pair of transmission shafts (301); a driving member (303) is arranged on one side of the mounting frame (300); an output shaft of the driving member (303) passes through the mounting frame (300) and is fixedly connected to an end of one of the transmission shafts (301) for driving the transmission shaft (301); and the output shaft of the driving member (303) is rotatably connected to the mounting frame (300); The positioning member (304) includes a pair of support arms (305), a mounting crossbeam (306), a plurality of rotating sleeves (307) and a positioning plate (308). The pair of support arms (305) are arranged at the top of the mounting frame (300) close to the shearing machine body (20), and are respectively located on both sides of the conveyor belt (302) and are arranged in cooperation with the conveyor belt (302). The mounting crossbeam (306) is arranged at the top of the pair of support arms (305), and the plurality of rotating sleeves (307) are arranged under the mounting crossbeam (306). The rotating sleeve (307) is rotatably connected to the mounting crossbeam (306); the bottom of the rotating sleeve (307) is matched with the conveyor belt (302); the positioning plate (308) is arranged between the mounting frame (300) and the shearing machine body (20), and is connected to the pair of support arms (305) through a pair of connecting rods (309); a positioning opening (310) for the passage of rods is arranged between two adjacent rotating sleeves (307); and a positioning groove (311) matched with the positioning opening (310) is arranged on the positioning plate (308).

2. A bar flying shear mechanism capable of rapid positioning according to claim 1, characterized in that: The driving member (303) is a rotating motor, and the driving member (303) is mounted on the base (10) via a mounting seat (312).

3. A bar flying shear mechanism capable of rapid positioning according to claim 1, characterized in that: The shearing machine body (20) comprises a tool structure (21) and a driving structure (22). The tool structure (21) comprises an installation frame (200), a fixed tool (201), a cutting tool (202), a moving part (203) and a pair of elastic reset parts (204). The installation frame (200) is arranged on a base (10). The moving part (203) is arranged in the installation frame (200) and its two ends are respectively slidably connected to the installation frame (200). The pair of elastic reset parts (204) are arranged on the base (10) and are respectively arranged in cooperation with the two ends of the moving part (203). The cutting tool (202) is arranged at the bottom of the moving part (203) and is detachably connected to the moving part (203). The fixed tool (201) is arranged on the base (10) and is located in the installation frame (200) and is arranged in cooperation with the cutting tool (202). The driving structure (22) is arranged on one side of the tool structure (21) and is used to drive the moving part (203).

4. A bar flying shear mechanism capable of rapid positioning according to claim 3, characterized in that: One end of the positioning plate (308) is arranged in cooperation with the fixed tool (201) and the cutting tool (202).

5. A bar flying shear mechanism capable of rapid positioning according to claim 4, characterized in that: The moving part (203) comprises a mounting portion (205) and sliding connection blocks (206) arranged on both sides of the mounting portion (205); sliding mounting grooves (207) are arranged on both sides of the mounting frame (200); the sliding connection blocks (206) on both sides of the mounting portion (205) are respectively located in the sliding mounting grooves (207) on both sides of the mounting frame (200) and are slidably connected to the mounting frame (200); the cutting tool (202) is arranged at the bottom of the mounting portion (205) and is detachably connected to the bottom of the mounting portion (205) by bolts.

6. A bar flying shear mechanism capable of rapid positioning according to claim 5, characterized in that: A pair of elastic reset members (204) are respectively arranged in the sliding installation grooves (207) on both sides of the installation frame (200).

7. A bar flying shear mechanism capable of rapid positioning according to claim 6, characterized in that: The elastic reset member (204) comprises a telescopic rod (208) and a reset spring (209), wherein the reset spring (209) is sleeved on the outside of the telescopic rod (208), and one end of the telescopic rod (208) and the reset spring (209) is fixedly connected to the base (10), and the other end is connected to the sliding connection block (206).

8. A bar flying shear mechanism capable of rapid positioning according to claim 7, characterized in that: The driving structure (22) comprises a rotating shaft (210), a plurality of cams (211) and a driving part (212); the rotating shaft (210) is arranged in the installation frame (200) and is rotatably connected to the installation frame (200); the rotating shaft (210) is arranged above the moving member (203); the plurality of cams (211) are arranged on the rotating shaft (210) and are fixedly connected to the rotating shaft (210); the plurality of cams (211) are arranged in cooperation with the installation part (205) and are used to drive the installation part (205); one end of the rotating shaft (210) passes through the installation frame (200) and is connected to the driving part (212); the driving part (212) is used to drive the rotating shaft (210).

9. A bar flying shear mechanism capable of rapid positioning according to claim 8, characterized in that: The driving part (212) comprises a worm wheel (213), a worm (214) and a driving motor (215); the worm wheel (213) is arranged on one side of the rotating shaft (210) penetrating the mounting frame (200) and is fixedly connected to the rotating shaft (210); the worm (214) is arranged in cooperation with the worm wheel (213) and is used to drive the worm wheel (213); and the output shaft of the driving motor (215) is fixedly connected to one end of the worm (214) and is used to drive the worm (214).

10. A bar flying shear mechanism capable of rapid positioning according to claim 9, characterized in that: The invention also comprises a mounting bracket (216) and a mounting box (217), wherein the mounting bracket (216) is arranged on the base (10) and is arranged in cooperation with the mounting frame (200), the mounting box (217) is arranged on the mounting bracket (216), one end of the rotating shaft (210) passes through the mounting frame (200) and the mounting box (217), and is rotatably connected to the mounting box (217), the worm gear (213) is arranged at one end of the rotating shaft (210) located in the mounting box (217), the worm (214) is arranged in the mounting box (217) and is arranged in cooperation with the worm gear (213), both ends of the worm (214) are rotatably connected to the mounting box (217), and the output shaft of the driving motor (215) passes through the mounting box (217) and is fixedly connected to one end of the worm (214).

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