A device for removing excess material for producing bicycle TPU tires

Abstract

The invention discloses a waste material cutting device for bicycle TPU tire production, belonging to the technical field of tire production. A waste material cutting device for bicycle TPU tire production comprises an operating table, a support assembly is arranged in the inner cavity of the operating table, a circular rotating block is connected to the lower end of the support assembly, and the outer surfaces of both ends of the circular rotating block are connected to support rods, and the first gear and the circular rotating block are driven to rotate synchronously by starting the second driving motor, thereby driving the arc-shaped outer cutting blade to rotate counterclockwise, and the inner cutting blade to rotate clockwise, and then the burrs and protrusions at the edge of the tire airtight curtain and the burrs and protrusions on the outer surface of the tire are cut off, so that the inner cutting assembly and the outer cutting assembly can produce a linkage effect, and the tire airtight curtain can fit the metal rim perfectly, thereby improving the airtightness of the tire, and then improving the service life of the tire.

Description

Technical Field

[0001] The invention relates to the technical field of tire production, and more specifically to a residual material cutting device for producing bicycle TPU tires. Background Art

[0002] Tires are circular elastic rubber products that roll on the ground and are installed on various vehicles or machinery. They are usually installed on metal rims and can support the vehicle body, cushion external impacts, achieve contact with the road surface and ensure the vehicle's driving performance. Tires are often used under complex and harsh conditions. They are subjected to various deformations, loads, forces, and high and low temperature effects when driving. Therefore, they must have high load-bearing performance, traction performance, and cushioning performance. At the same time, they are also required to have high wear resistance and flexibility resistance, as well as low rolling resistance and heat generation.

[0003] After the tire is thermoplasticized, it is cooled and shaped to form a tire. At this time, the edge of the tire's airtight curtain has burrs and raised parts due to uneven temperature during the thermoplastic process. The airtight curtain is connected to the metal rim. If there are burrs and raised parts on the edge of the airtight curtain, there will be concave and convex parts at the connection between the airtight curtain and the metal rim. At this time, if the tire is inflated, gas may overflow from the concave and convex parts, thereby reducing the airtightness of the tire. Summary of the invention

[0004] The object of the present invention is to provide a waste material removal device for producing bicycle TPU tires to solve the problems raised in the above-mentioned background technology.

[0005] A waste material removal device for producing bicycle TPU tires, comprising an operating table, a support assembly is arranged in the inner cavity of the operating table, a circular rotating block is connected to the lower end of the support assembly, the outer surfaces of both ends of the circular rotating block are connected to a first support rod, the upper end of the first support rod is connected to an annular support plate, and the lower end of the circular rotating block is connected to a circular support block, the lower end of the circular support block is connected to a first electric telescopic rod, the inner cavity of the circular support block is connected to a driving assembly, and an arc groove is provided on the upper end surface of the circular support block;

[0006] The support assembly includes a first driving motor, a second circular connecting block and a plurality of second connecting rods, the output end of the first driving motor is sleeved with a bidirectional threaded rod, the lower end surface of the bidirectional threaded rod is sleeved with a first circular connecting block, the upper end surface of the first circular connecting block is rotatably connected to a plurality of first connecting rods, one end of each of the first connecting rods away from the first circular connecting block is rotatably connected to the second connecting rod, the connection between each of the first connecting rods and each of the second connecting rods is rotatably connected to an arc-shaped supporting plate, one end of the second connecting rod away from the arc-shaped supporting plate is connected to the second circular connecting block, and the upper and lower ends of the arc-shaped supporting plate on a side close to the bidirectional threaded rod are connected to inner cutting assemblies;

[0007] The driving component includes a second driving motor, the output end of the second driving motor is sleeved with a first gear, one end of the first gear is meshed with a second gear, the upper end of the second gear is sleeved with a first rotating belt, the other end of the first rotating belt is connected to a circular rotating disk, both ends of the circular rotating disk are connected to outer cutting components, and a circular hole is provided in the circular part of the circular rotating disk, and the diameter of the circular hole is larger than the diameter of the output end of the second driving motor, the output end of the second driving motor is connected to the lower end surface of the circular rotating block by passing through the circular rotating disk and the circular supporting block, and rectangular sliding grooves are provided on the both end surfaces of the circular rotating disk.

[0008] Preferably, the plurality of arc-shaped support plates are combined into a first annular support plate, the output end of the first drive motor is connected to a bidirectional threaded rod by penetrating the upper end surface of the circular rotating block, and the diameter of the annular support plate is larger than the diameter of the circular support plate and smaller than the tire diameter.

[0009] Preferably, the upper end surface of the circular rotating block is connected to a guide rod, and the guide rod passes through the first circular connecting block and the second circular connecting block. The lower end of the inner cutting assembly is connected to a circular trigger plate, and a plurality of rectangular grooves are provided on the upper and lower end surfaces of the circular trigger plate. The lower end surface of the circular trigger plate is connected to a second support rod, and the number of rectangular grooves is equal to the number of inner cutting assemblies, and the lower end of the second support rod is connected to the upper end surface of the circular rotating block.

[0010] Preferably, the inner resection assembly includes a rectangular support block, and the inner cavity of one end of the rectangular support block close to the bidirectional threaded rod is rotatably connected to a third gear, the lower end of the third gear is meshed with a first rack, and one end of the third gear is sleeved with a second rotating belt, the end of the second rotating belt away from the third gear is sleeved with a first bevel gear, the lower end of the first bevel gear is meshed with a second bevel gear, the upper end of the second bevel gear is connected to a threaded rod, the outer side of the threaded rod is sleeved with a contact block, and one end of the contact block is connected to the inner resection blade.

[0011] Preferably, the first rack is installed in the inner cavity of the rectangular groove, the end of the rectangular support block away from the bidirectional threaded rod is connected to the inner side of the arc support plate, and a rectangular frame is provided on the outer side of the threaded rod, and a rectangular guide groove is opened at one end of the rectangular frame, so that the inner cutting blade is located on the outer side of the rectangular frame by passing through the rectangular guide groove.

[0012] Preferably, the outer cutting assembly includes a second electric telescopic rod, one side of the second electric telescopic rod is connected to a rectangular connecting rod, the end of the rectangular connecting rod away from the second electric telescopic rod is connected to a second rack, one end of the second rack is meshed with a fourth gear, and one end of the fourth gear is meshed with a fifth gear.

[0013] Preferably, one end of the fifth gear is sleeved with a third rotating belt, the end of the third rotating belt away from the fifth gear is sleeved with a sixth gear, the upper end of the sixth gear is meshed with a third rack, and the end of the third rack close to the middle part of the operating table is connected to an arc-shaped outer cutting blade.

[0014] Preferably, rectangular sliding grooves are provided on both sides of the upper end of the operating table, and the third rack is installed in the inner cavity of the rectangular sliding grooves.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] 1. In the present invention, by starting the second driving motor, the first gear and the circular rotating block are driven to rotate synchronously, thereby driving the arc-shaped outer cutting blade to rotate counterclockwise and the inner cutting blade to rotate clockwise, thereby performing a cutting operation on the burrs and raised parts at the edge of the tire airtight curtain and the burrs and raised parts on the outer surface of the tire, so that the inner cutting component and the outer cutting component can produce a linkage effect, and the tire airtight curtain can fit perfectly with the metal rim, thereby improving the airtightness of the tire and thus increasing the service life of the tire.

[0017] 2. In the present invention, the arc-shaped support plate is driven to expand in all directions by the first driving motor, thereby driving the rotation of the third gear, and then driving the inner cutting blade and the contact block to move along the threaded rod. When the arc-shaped support plate contacts the inner wall of the tire, the lower end surface of the contact block contacts the outer surface of the tire lip, and at the same time, the inner cutting blade is located on the outer surface of the tire air-tight curtain. At this time, the second driving motor is started to drive the inner cutting blade to rotate, and then the burrs and protrusions on the outer surface of the tire air-tight curtain are cut off, thereby improving the airtightness inside the tire.

[0018] 3. In the present invention, by starting the second electric telescopic rod, the second rack is driven to move upward, thereby driving the third rack and the arc-shaped outer cutting blade to move along the rectangular slide groove toward the middle part of the operating table, and the arc-shaped outer cutting blade will perform a correction operation on the tire during the movement, so that the tire is located in the center of the operating table, thereby providing a prerequisite for the next cutting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the support assembly structure of the present invention.

[0021] Figure 3 It is a partial structural schematic diagram of the support assembly of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the medial resection component of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of the driving component of the present invention.

[0024] Figure 6 It is a schematic diagram of the structure of the outer resection component of the present invention.

[0025] Explanation of reference numerals in the figure: 1, operating table; 2, supporting assembly; 201, first driving motor; 202, bidirectional threaded rod; 203, guide rod; 204, first circular connecting block; 205, first connecting rod; 206, arc-shaped supporting plate; 207, second connecting rod; 208, second circular connecting block; 209, inner side cutting assembly; 210, circular trigger plate; 211, rectangular groove; 212, second supporting rod; 213, rectangular supporting block; 214, third gear; 215, first rack; 216, second rotating belt; 217, first bevel gear; 218, second bevel gear; 219, threaded rod; 220 , contact block; 221, inner cutting blade; 3, circular rotating block; 4, first support rod; 5, annular support plate; 6, circular support block; 7, first electric telescopic rod; 8, driving assembly; 801, second driving motor; 802, first gear; 803, second gear; 804, first rotating belt; 805, circular rotating disk; 806, outer cutting assembly; 807, second electric telescopic rod; 808, second rack; 809, fourth gear; 810, fifth gear; 811, third rotating belt; 812, sixth gear; 813, third rack; 814, arc-shaped outer cutting blade; 815, rectangular connecting rod. DETAILED DESCRIPTION

[0026] Example: See Figure 1A residual material cutting device for producing bicycle TPU tires, comprising an operating table 1, a support assembly 2 is arranged in the inner cavity of the operating table 1, a circular rotating block 3 is connected to the lower end of the support assembly 2, a first support rod 4 is connected to the outer surfaces of both ends of the circular rotating block 3, an annular support plate 5 is connected to the upper end of the first support rod 4, and a circular supporting block 6 is connected to the lower end of the circular rotating block 3, a first electric telescopic rod 7 is connected to the lower end of the circular supporting block 6, a driving assembly 8 is connected to the inner cavity of the circular supporting block 6, and an arc groove is opened on the upper end surface of the circular supporting block 6;

[0027] See also Figure 2 The support assembly 2 includes a first driving motor 201, a second circular connecting block 208 and a plurality of second connecting rods 207. The output end of the first driving motor 201 is sleeved with a bidirectional threaded rod 202. The lower end surface of the bidirectional threaded rod 202 is sleeved with a first circular connecting block 204. The upper end surface of the first circular connecting block 204 is rotatably connected with a plurality of first connecting rods 205. The end of each first connecting rod 205 away from the first circular connecting block 204 is rotatably connected with a second connecting rod 207. The connection between each first connecting rod 205 and each second connecting rod 207 is rotatably connected with an arc-shaped supporting plate 206. The end of the second connecting rod 207 away from the arc-shaped supporting plate 206 is connected with a second circular connecting block 208. The upper and lower ends of the arc-shaped supporting plate 206 close to the bidirectional threaded rod 202 are connected with inner cutting assemblies 209.

[0028] See also Figure 5 The driving component 8 includes a second driving motor 801, the output end of the second driving motor 801 is sleeved with a first gear 802, one end of the first gear 802 is meshed with a second gear 803, the outer side of the upper end of the second gear 803 is sleeved with a first rotating belt 804, the other end of the first rotating belt 804 is connected to a circular rotating disk 805, both ends of the circular rotating disk 805 are connected to outer cutting components 806, and a circular hole is opened in the circular part of the circular rotating disk 805, and the diameter of the circular hole is larger than the diameter of the output end of the second driving motor 801, then the output end of the second driving motor 801 is connected to the lower end surface of the circular rotating block 3 by passing through the circular rotating disk 805 and the circular supporting block 6, and rectangular sliding grooves are opened on the two end surfaces of the circular rotating disk 805.

[0029] Specifically, the first drive motor 201 drives the arc-shaped support plate 206 to expand in all directions, thereby driving the rotation of the third gear 214, and then driving the inner cutting blade 221 and the contact block 220 to move along the threaded rod 219. When the arc-shaped support plate 206 contacts the inner wall of the tire, the lower end surface of the contact block 220 contacts the outer surface of the tire bead, and at the same time, the inner cutting blade 221 is located on the outer surface of the tire air-tight curtain. At this time, the second drive motor 801 is started, thereby driving the inner cutting blade 221 to rotate, and then the burrs and protrusions on the outer surface of the tire air-tight curtain are cut off, thereby improving the airtightness inside the tire.

[0030] Several arc-shaped support plates 206 are combined into a first annular support plate. The output end of the first drive motor 201 is connected to the bidirectional threaded rod 202 by penetrating the upper end surface of the circular rotating block 3. The diameter of the annular support plate 5 is larger than the diameter of the circular support plate and smaller than the tire diameter.

[0031] See also Figure 3 The upper end surface of the circular rotating block 3 is connected with a guide rod 203, and the guide rod 203 passes through the first circular connecting block 204 and the second circular connecting block 208. The lower end of the inner cutting component 209 is connected with a circular trigger plate 210. The upper and lower end surfaces of the circular trigger plate 210 are provided with a plurality of rectangular grooves 211, and the lower end surface of the circular trigger plate 210 is connected with a second support rod 212, and the number of rectangular grooves is equal to the number of inner cutting components 209, and the lower end of the second support rod 212 is connected to the upper end surface of the circular rotating block 3.

[0032] See also Figure 4 The inner resection component 209 includes a rectangular support block 213, and the inner cavity of one end of the rectangular support block 213 close to the bidirectional threaded rod 202 is rotatably connected to a third gear 214, the lower end of the third gear 214 is meshed with a first rack 215, and one end of the third gear 214 is sleeved with a second rotating belt 216, and the end of the second rotating belt 216 away from the third gear 214 is sleeved with a first bevel gear 217, the lower end of the first bevel gear 217 is meshed with a second bevel gear 218, the upper end of the second bevel gear 218 is connected to a threaded rod 219, the outer side of the threaded rod 219 is sleeved with a contact block 220, and one end of the contact block 220 is connected to an inner resection blade 221.

[0033] The first rack 215 is installed in the inner cavity of the rectangular groove 211, and the end of the rectangular support block 213 away from the bidirectional threaded rod 202 is connected to the inner side of the arc support plate 206, and a rectangular frame is arranged on the outer side of the threaded rod 219, and a rectangular guide groove is opened at one end of the rectangular frame, and the inner cutting blade 221 is located on the outer side of the rectangular frame by passing through the rectangular guide groove.

[0034] Specifically, by starting the second drive motor 801, the first gear 802 and the circular rotating block 3 will be driven to rotate synchronously, thereby driving the arc-shaped outer cutting blade 814 to rotate counterclockwise and the inner cutting blade 221 to rotate clockwise, thereby performing a cutting operation on the burrs and protrusions at the edge of the tire air-tight curtain and the burrs and protrusions on the outer surface of the tire. In this way, the inner cutting component 209 and the outer cutting component 806 can produce a linkage effect, and the tire air-tight curtain can fit perfectly with the metal rim, thereby improving the air tightness of the tire and thus increasing the service life of the tire.

[0035] See also Figure 6 The outer cutting component 806 includes a second electric telescopic rod 807, one side of the second electric telescopic rod 807 is connected to a rectangular connecting rod 815, one end of the rectangular connecting rod 815 away from the second electric telescopic rod 807 is connected to a second rack 808, one end of the second rack 808 is meshed with a fourth gear 809, one end of the fourth gear 809 is meshed with a fifth gear 810, and both ends of the second electric telescopic rod 807 are provided with rectangular connecting rods 815, and the upper and lower ends of the rectangular connecting rod 815 close to the second electric telescopic rod 807 are provided with third circular connecting blocks, when the arc-shaped outer cutting blade 814 contacts the outer surface of the tire, the rectangular connecting rod 815 is separated from the second electric telescopic rod 807 and is located at the end of the third circular connecting block.

[0036] See also Figure 6 One end of the fifth gear 810 is sleeved with the third rotating belt 811, the end of the third rotating belt 811 away from the fifth gear 810 is sleeved with the sixth gear 812, the upper end of the sixth gear 812 is meshed with the third rack 813, and the end of the third rack 813 close to the middle part of the operating table 1 is connected to the arc-shaped outer cutting blade 814.

[0037] Rectangular sliding grooves are provided on both sides of the upper end of the operating table 1, and the third rack 813 is installed in the inner cavity of the rectangular sliding grooves.

[0038] Specifically, by starting the second electric telescopic rod 807, the second rack 808 will be driven to move upward, thereby driving the third rack 813 and the arc-shaped outer cutting blade 814 to move along the rectangular slide groove toward the middle part of the operating table 1, and the arc-shaped outer cutting blade 814 will perform a correction operation on the tire during the movement, so that the tire is located in the center part of the operating table 1, thereby providing a prerequisite for the next cutting operation.

[0039] Working principle: First, place the tire on the upper end surface of the annular support plate 5. At this time, start the first electric telescopic rod 7 and the second electric telescopic rod 807, so that the first electric telescopic rod 7 is extended and the second electric telescopic rod 807 is retracted, and the first electric telescopic rod 7 and the second electric telescopic rod 807 are operated synchronously. As the first electric telescopic rod 7 is extended, the circular support block 6, the circular rotating block 3 and the support assembly 2 are moved upward, and the second electric telescopic rod 807 is retracted, which drives the second rack 808 to move upward. The fourth gear 809 is driven to rotate, and then the fifth gear 810 is driven to rotate. The rotation of the fifth gear 810 drives the third rotating belt 811 to rotate, thereby driving the sixth gear 812 to rotate, and then driving the third rack 813 and the arc-shaped outer cutting blade 814 to move along the rectangular slide groove toward the middle part of the operating table 1. When the first electric telescopic rod 7 and the second electric telescopic rod 807 stop operating, the arc-shaped outer cutting blade 814 contacts the outer surface of the tire, and the end of the second electric telescopic rod 807 is in the inner cavity of the annular groove;

[0040] At this time, the first driving motor 201 is started to drive the rotation of the bidirectional threaded rod 202, thereby driving the first circular connecting block 204 and the second circular connecting block 208 to move along the guide rod 203 toward the middle part of the bidirectional threaded rod 202, and then driving the first connecting rod 205 and the second connecting rod 207 to extend in all directions, and then driving the arc-shaped support plate 206 to extend in all directions until the outer side of the arc-shaped support plate 206 contacts the inner wall of the tire;

[0041] In the process of extending the arc-shaped support plate 206, the rectangular support block 213 will be driven to move toward the tire, thereby driving the third gear 214 to rotate along the first rack 215, thereby driving the second rotating belt 216 to rotate, and then driving the first bevel gear 217 to rotate. The rotation of the first bevel gear 217 will drive the second bevel gear 218 to rotate, thereby driving the threaded rod 219 to rotate, and then driving the contact block 220 and the inner cutting blade 221 to move downward along the threaded rod 219. When the outer side of the arc-shaped support plate 206 contacts the inner wall of the tire, the lower end surface of the contact block 220 contacts the outer surface of the tire bead, and at the same time, the inner cutting blade 221 is located on the outer surface of the tire airtight curtain.

[0042] When the inner cutting blade 221 is located on the outer surface of the tire airtight curtain, the second driving motor 801 is started and drives the first gear 802 and the circular rotating block 3 to rotate synchronously, and the clockwise rotation of the first gear 802 will drive the second gear 803 to rotate counterclockwise, thereby driving the first rotating belt 804 to rotate counterclockwise, and then driving the circular rotating disk 805 to rotate counterclockwise, and the counterclockwise rotation of the circular rotating disk 805 will drive the second electric telescopic rod 807 to rotate counterclockwise, thereby driving the arc-shaped outer cutting blade 814 to rotate counterclockwise, and the rotation of the circular rotating block 3 will drive the support assembly 2 and the inner cutting blade 221 to rotate clockwise, thereby performing a cutting operation on the burrs and bumps on the outer side of the tire and the edge of the airtight curtain, until the cutting operation is completed, and all operations are ended.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for removing excess material for producing bicycle TPU tires, comprising an operating table (1), characterized in that: A support assembly (2) is arranged in the inner cavity of the operating table (1); the lower end of the support assembly (2) is connected to a circular rotating block (3); the outer surfaces of both ends of the circular rotating block (3) are connected to first support rods (4); the upper end of the first support rod (4) is connected to an annular support plate (5); the lower end of the circular rotating block (3) is connected to a circular support block (6); the lower end of the circular support block (6) is connected to a first electric telescopic rod (7); and the inner cavity of the circular support block (6) is connected to a driving assembly (8); The support assembly (2) comprises a first drive motor (201), a second circular connection block (208) and a plurality of second connection rods (207); the output end of the first drive motor (201) is sleeved with a bidirectional threaded rod (202); the lower end surface of the bidirectional threaded rod (202) is sleeved with a first circular connection block (204); the upper end surface of the first circular connection block (204) is rotatably connected to a plurality of first connection rods (205); an end of each of the first connection rods (205) away from the first circular connection block (204) is rotatably connected to a second connection rod (207); a connection between each of the first connection rods (205) and each of the second connection rods (207) is rotatably connected to an arc-shaped support plate (206); an end of the second connection rod (207) away from the arc-shaped support plate (206) is connected to the second circular connection block (208); and the upper and lower ends of a side of the arc-shaped support plate (206) close to the bidirectional threaded rod (202) are connected to an inner cutting assembly (209); The driving assembly (8) comprises a second driving motor (801), the output end of the second driving motor (801) is sleeved with a first gear (802), one end of the first gear (802) is meshed with a second gear (803), the outer side of the upper end of the second gear (803) is sleeved with a first rotating belt (804), the other end of the first rotating belt (804) is connected to a circular rotating disk (805), and both ends of the circular rotating disk (805) are connected to outer cutting assemblies (806); The plurality of arc-shaped support plates (206) are combined into a first annular support plate, and the output end of the first drive motor (201) is connected to the bidirectional threaded rod (202) by penetrating the upper end surface of the circular rotating block (3); The upper end surface of the circular rotating block (3) is connected to a guide rod (203), the guide rod (203) passes through the first circular connecting block (204) and the second circular connecting block (208), the lower end of the inner cutting component (209) is connected to a circular trigger plate (210), the upper and lower end surfaces of the circular trigger plate (210) are provided with a plurality of rectangular grooves (211), and the lower end surface of the circular trigger plate (210) is connected to a second support rod (212), and by starting the first driving motor (201) and driving the rotation of the bidirectional threaded rod (202), the first circular connecting block (204) and the second circular connecting block (208) are driven to move along the guide rod (203) toward the middle part of the bidirectional threaded rod (202); The inner resection component (209) comprises a rectangular support block (213), wherein the inner cavity of one end of the rectangular support block (213) close to the bidirectional threaded rod (202) is rotatably connected to a third gear (214), the lower end of the third gear (214) is meshed with a first rack (215), and one end of the third gear (214) is sleeved with a second rotating belt (216), the end of the second rotating belt (216) away from the third gear (214) is sleeved with a first bevel gear (217), the lower end of the first bevel gear (217) is meshed with a second bevel gear (218), the upper end of the second bevel gear (218) is connected to a threaded rod (219), the outer side of the threaded rod (219) is sleeved with a contact block (220), and one end of the contact block (220) is connected to an inner resection blade (221); The first rack (215) is installed in the inner cavity of the rectangular groove (211), and one end of the rectangular support block (213) away from the bidirectional threaded rod (202) is connected to the inner side of the arc-shaped support plate (206); The outer cutting assembly (806) comprises a second electric telescopic rod (807), one side of the second electric telescopic rod (807) is connected to a rectangular connecting rod (815), one end of the rectangular connecting rod (815) away from the second electric telescopic rod (807) is connected to a second rack (808), one end of the second rack (808) is meshed with a fourth gear (809), and one end of the fourth gear (809) is meshed with a fifth gear (810); One end of the fifth gear (810) is sleeved with a third rotating belt (811), an end of the third rotating belt (811) away from the fifth gear (810) is sleeved with a sixth gear (812), an upper end of the sixth gear (812) is meshed with a third rack (813), and an end of the third rack (813) close to the middle portion of the operating table (1) is connected to an arc-shaped outer cutting blade (814); Rectangular sliding grooves are provided on both sides of the upper end of the operating table (1), and the third rack (813) is installed in the inner cavity of the rectangular sliding groove.

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