Durable heat-sealed plastic woven square bottom bag and production process thereof

Abstract

The invention relates to the technical field of plastic woven bags, and discloses a durable heat-sealing plastic woven square-bottom bag which is characterized by comprising the following components in parts by weight: 40-60 parts of polypropylene, 30-60 parts of polyethylene, 4-7 parts of polyethylene wax, 4-15 parts of glyceryl stearate, 1-3 parts of a PP impact modifier, 15-30 parts of a filler, 0.5-3 parts of a light stabilizer and 1-5 parts of an antioxidant. According to the invention, by utilizing the cooperation and cooperation of the raw materials, not only are the heat resistance, weather resistance, rigidity and toughness of the product improved, but also the heating temperature in the whole production process is reduced, the production energy consumption is reduced, the production period is shortened, and the production cost of enterprises is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic woven bags, in particular to a durable heat-sealed plastic woven square bottom bag and a production process thereof. Background Art

[0002] Woven bags are a type of plastic bag used for packaging. Their raw materials are generally various chemical plastic raw materials such as polyethylene and polypropylene. Plastic woven bags are made of polypropylene as the main raw material, which is extruded and stretched into flat wires, and then woven, knitted and made into bags.

[0003] The existing plastic woven bags are first woven into a cylindrical structure, then rolled, and then cut and bagged; for the convenience of processing, continuous rolling and processing are usually carried out before cutting. The woven bags are usually woven from cross-woven wires. During the production process of plastic woven bags, it is necessary to cut the plastic woven bags. Existing cutting equipment such as the authorization announcement number CN221476341U discloses a cutting equipment for plastic woven bag production. The knife seat of the application moves downward to drive the cutting knife to cut the fixed plastic woven bag, so as to prevent the two sides of the plastic woven bag from tilting or shifting when cutting the plastic woven bag, thereby ensuring the stable cutting of the plastic woven bag and the quality of the cutting, starting motor one and motor two, so that the unwinding roller and the two pushing rollers rotate, and the plastic woven bag is conveyed, so that the plastic woven bag can be conveyed to the cutting board, so as to achieve the purpose of automatic feeding, and ensure the continuous cutting of the plastic woven bag. The operation is simpler, no staff is required to feed the material, the automation is high, and the cutting efficiency of the plastic woven bag is improved.

[0004] Existing plastic woven bags will add fillers to improve the stability and fluidity of the plastic woven bags, but calcium carbonate is generally used. Although it can be combined with its poor toughness and rigidity, and causes the surface of the woven bag to be dull, and when cutting, after one cutting is completed, similar to the above-mentioned existing technology, manual pulling is required for subsequent cutting, which is more troublesome. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a durable heat-sealed plastic woven square bottom bag and a production process thereof, which can improve the heat resistance and weather resistance as well as the rigidity and toughness of the plastic woven bag, and can automatically pull the material during cutting.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a durable heat-sealable plastic woven square bottom bag, which comprises the following components in parts by weight: 40-60 parts of polypropylene, 30-60 parts of polyethylene, 4-7 parts of polyethylene wax, 4-15 parts of stearic acid glyceryl, 1-3 parts of PP impact resister, 15-30 parts of filler, 0.5-3 parts of light stabilizer, and 1-5 parts of antioxidant.

[0007] Preferably, the plastic woven square bottom bag comprises the following components in parts by weight: 40 parts of polypropylene, 30 parts of polyethylene, 4 parts of polyethylene wax, 15 parts of glyceryl stearate, 3 parts of PP impact agent, 30 parts of filler, 1.5 parts of light stabilizer, and 3 parts of antioxidant.

[0008] Preferably, the plastic woven square bottom bag comprises the following components in parts by weight: 60 parts of polypropylene, 60 parts of polyethylene, 7 parts of polyethylene wax, 4 parts of glyceryl stearate, 1 part of PP impact agent, 15 parts of filler, 1.8 parts of light stabilizer, and 4 parts of antioxidant.

[0009] Preferably, the plastic woven square bottom bag comprises the following components in parts by weight: 50 parts of polypropylene, 40 parts of polyethylene, 5.5 parts of polyethylene wax, 10 parts of glyceryl stearate, 2 parts of PP impact agent, 23 parts of filler, 0.5 parts of light stabilizer, and 5 parts of antioxidant.

[0010] A production process for durable heat-sealed plastic woven square bottom bags, comprising the following steps: a. Material preparation: put the raw materials into the dry mixer according to the proportion and stir them. After stirring and mixing, draw the wire; b. Weaving: After drawing, it is dried, then weaved by a weaving machine, and then coated; c. Cutting: After lamination, it is dried, then rolled up and stored, and then cut through cutting equipment; d. Printing: After cutting, printing is carried out according to practical needs; e. Sewing: Then sew it into a square bottom bag and finally pack it.

[0011] Preferably, the cutting equipment in step c comprises a shearing table, a winding roller is rotatably installed on the shearing table, a U-shaped frame is fixedly installed on the upper end of the shearing table, a hydraulic rod is fixedly installed on the U-shaped frame, a cutting knife is fixedly installed on the lower end of the hydraulic rod, an extrusion assembly is fixedly installed on the lower end of the hydraulic rod, an installation groove is opened on the upper end of the shearing table, a clamping assembly is slidably arranged in the installation groove, installation plates are fixedly installed on both sides of the upper end of the shearing table, a conveyor belt is arranged on the installation plate, a fixed rod is fixedly installed between the two conveyor belts, and a rotating assembly is fixedly installed on the fixed rod.

[0012] Preferably, the extrusion assembly includes slides fixedly mounted on both sides of the lower end of the hydraulic rod, an extrusion plate is arranged below the slide, a shell slidably connected to the slide is fixedly mounted on the upper end of the extrusion plate, and a telescopic spring is fixedly mounted between the slide and the shell.

[0013] Preferably, the clamping assembly includes a mounting block slidably connected to the mounting groove, a group of clamping limit rollers are rotatably arranged on the mounting block, a limit plate is fixedly installed between the two mounting blocks, sliding openings connected to the mounting groove are opened on both sides of the shearing table, the limit plate passes through the sliding openings, a connecting spring is fixedly arranged between the limit plate and the mounting groove, and a pushing rod for pushing the limit plate is fixedly installed on one side of the cutter.

[0014] Preferably, the rotating assembly includes a ring fixedly mounted on a fixed rod, an electric push rod is fixedly mounted on one side of the ring, a group of connecting plates are fixedly mounted on the outside of the electric push rod, a gear is rotatably mounted on the connecting plate, a splint is fixedly mounted on one side of the gear, and a toothed plate meshing with the gear is fixedly mounted on the working end of the electric push rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention utilizes the synergy and coordination between raw materials, which not only improves the heat resistance and weather resistance as well as the rigidity and toughness of the product, but also reduces the heating temperature of the entire production process, reduces production energy consumption, shortens the production cycle, and greatly reduces the production cost of the enterprise.

[0016] 2. The present invention fixes a group of connecting plates on the outside of the electric push rod on one side of the ring, fixes a clamping plate on one side of the gear rotatably installed on the connecting plate, and fixes a toothed plate meshing with the gear on the working end of the electric push rod. By starting the electric push rod, the two clamping plates can be driven to close through the cooperation of the gear and the toothed plate to clamp one end of the plastic woven bag, and then the conveyor belt works to realize automatic material pulling.

[0017] 3. The present invention can clamp and fix one end of the cut plastic woven bag by rotatably setting a group of clamping and limiting rollers on the mounting block in the mounting groove, which is convenient for subsequent clamping and pulling of materials. The clamping and limiting rollers are pushed upward by connecting springs, so that the clamped end of the plastic woven bag moves upward and does not contact the shearing table, which is convenient for subsequent clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the front three-dimensional structure of the shearing table of the present invention; Figure 2 It is a schematic diagram of the side view of the stereoscopic structure of the shearing table of the present invention; Figure 3 It is a schematic diagram of a side-view three-dimensional cross-sectional structure of a shearing table of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the limiting component of the present invention; Figure 5 for Figure 4 A is a schematic diagram of the enlarged structure of the middle part; Figure 6 It is a schematic diagram of the three-dimensional structure of the clamping assembly of the present invention.

[0019] In the figure: 1. shearing table; 2. hydraulic rod; 3. winding roller; 4. U-shaped frame; 5. fixing rod; 6. conveyor belt; 7. mounting plate; 8. electric push rod; 9. pushing rod; 10. cutting knife; 11. limiting plate; 12. sliding mouth; 13. sliding plate; 14. mounting block; 15. clamping limiting roller; 16. housing; 17. extrusion plate; 18. connecting spring; 19. mounting groove; 20. collar; 21. clamping plate; 22. gear; 23. tooth plate; 24. connecting plate; 25. telescopic spring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] Embodiment 1: See also Figure 1-Figure 6 A durable heat-sealable plastic woven square bottom bag, the plastic woven square bottom bag includes the following components in parts by weight: 40 parts of polypropylene, 30 parts of polyethylene, 4 parts of polyethylene wax, 15 parts of stearic acid glyceryl, 3 parts of PP impact agent, 30 parts of filler, 1.5 parts of light stabilizer, and 3 parts of antioxidant.

[0022] A production process for durable heat-sealed plastic woven square bottom bags, comprising the following steps: a. Material preparation: put the raw materials into the dry mixer according to the proportion and stir them. After stirring and mixing, draw the wire; b. Weaving: After drawing, it is dried, then weaved by a weaving machine, and then coated; c. Cutting: After lamination, it is dried, then rolled up and stored, and then cut through cutting equipment; d. Printing: After cutting, printing is carried out according to practical needs; e. Sewing: Then sew it into a square bottom bag and finally pack it.

[0023] As a further technical solution of the present invention, the cutting equipment in step c includes a shearing table 1, on which a winding roller 3 is rotatably installed, a U-shaped frame 4 is fixedly installed on the upper end of the shearing table 1, a hydraulic rod 2 is fixedly installed on the U-shaped frame 4, a cutter 10 is fixedly installed on the lower end of the hydraulic rod 2, an extrusion assembly is fixedly installed on the lower end of the hydraulic rod 2, an installation groove 19 is opened at the upper end of the shearing table 1, a clamping assembly is slidably arranged in the installation groove 19, installation plates 7 are fixedly installed on both sides of the upper end of the shearing table 1, a conveyor belt 6 is arranged on the installation plate 7, a fixed rod 5 is fixedly installed between the two conveyor belts 6, and a rotating assembly is fixedly installed on the fixed rod 5.

[0024] As a further technical solution of the present invention, the extrusion assembly includes a slide plate 13 fixedly installed on both sides of the lower end of the hydraulic rod 2, an extrusion plate 17 is arranged below the slide plate 13, a shell 16 slidably connected to the slide plate 13 is fixedly installed on the upper end of the extrusion plate 17, and a telescopic spring 25 is fixedly installed between the slide plate 13 and the shell 16.

[0025] As a further technical solution of the present invention, the clamping assembly includes a mounting block 14 which is slidably connected to the mounting groove 19, a group of clamping limit rollers 15 are rotatably arranged on the mounting block 14, a limit plate 11 is fixedly installed between the two mounting blocks 14, sliding openings 12 which are connected to the mounting groove 19 are opened on both sides of the shearing table 1, the limit plate 11 passes through the sliding opening 12, a connecting spring 18 is fixedly arranged between the limit plate 11 and the mounting groove 19, and a push rod 9 for pushing the limit plate 11 is fixedly installed on one side of the cutter 10.

[0026] As a further technical solution of the present invention, the rotating assembly includes a ring 20 fixedly mounted on the fixed rod 5, an electric push rod 8 is fixedly installed on one side of the ring 20, a group of connecting plates 24 are fixedly installed on the outside of the electric push rod 8, a gear 22 is rotatably installed on the connecting plate 24, a splint 21 is fixedly installed on one side of the gear 22, and a tooth plate 23 meshing with the gear 22 is fixedly installed on the working end of the electric push rod 8.

[0027] Embodiment 2: A durable heat-sealable plastic woven square bottom bag, which comprises the following components in parts by weight: 60 parts of polypropylene, 60 parts of polyethylene, 7 parts of polyethylene wax, 4 parts of glyceryl stearate, 1 part of PP impact resister, 15 parts of filler, 1.8 parts of light stabilizer and 4 parts of antioxidant.

[0028] A production process for durable heat-sealed plastic woven square bottom bags, comprising the following steps: a. Material preparation: put the raw materials into the dry mixer according to the proportion and stir them. After stirring and mixing, draw the wire; b. Weaving: After drawing, it is dried, then weaved by a weaving machine, and then coated; c. Cutting: After lamination, it is dried, then rolled up and stored, and then cut through cutting equipment; d. Printing: After cutting, printing is carried out according to practical needs; e. Sewing: Then sew it into a square bottom bag and finally pack it.

[0029] As a further technical solution of the present invention, the cutting equipment in step c includes a shearing table 1, on which a winding roller 3 is rotatably installed, a U-shaped frame 4 is fixedly installed on the upper end of the shearing table 1, a hydraulic rod 2 is fixedly installed on the U-shaped frame 4, a cutter 10 is fixedly installed on the lower end of the hydraulic rod 2, an extrusion assembly is fixedly installed on the lower end of the hydraulic rod 2, an installation groove 19 is opened at the upper end of the shearing table 1, a clamping assembly is slidably arranged in the installation groove 19, installation plates 7 are fixedly installed on both sides of the upper end of the shearing table 1, a conveyor belt 6 is arranged on the installation plate 7, a fixed rod 5 is fixedly installed between the two conveyor belts 6, and a rotating assembly is fixedly installed on the fixed rod 5.

[0030] As a further technical solution of the present invention, the extrusion assembly includes a slide plate 13 fixedly installed on both sides of the lower end of the hydraulic rod 2, an extrusion plate 17 is arranged below the slide plate 13, a shell 16 slidably connected to the slide plate 13 is fixedly installed on the upper end of the extrusion plate 17, and a telescopic spring 25 is fixedly installed between the slide plate 13 and the shell 16.

[0031] As a further technical solution of the present invention, the clamping assembly includes a mounting block 14 which is slidably connected to the mounting groove 19, a group of clamping limit rollers 15 are rotatably arranged on the mounting block 14, a limit plate 11 is fixedly installed between the two mounting blocks 14, sliding openings 12 which are connected to the mounting groove 19 are opened on both sides of the shearing table 1, the limit plate 11 passes through the sliding opening 12, a connecting spring 18 is fixedly arranged between the limit plate 11 and the mounting groove 19, and a push rod 9 for pushing the limit plate 11 is fixedly installed on one side of the cutter 10.

[0032] As a further technical solution of the present invention, the rotating assembly includes a ring 20 fixedly mounted on the fixed rod 5, an electric push rod 8 is fixedly installed on one side of the ring 20, a group of connecting plates 24 are fixedly installed on the outside of the electric push rod 8, a gear 22 is rotatably installed on the connecting plate 24, a splint 21 is fixedly installed on one side of the gear 22, and a tooth plate 23 meshing with the gear 22 is fixedly installed on the working end of the electric push rod 8.

[0033] Embodiment 3: A durable heat-sealable plastic woven square bottom bag comprises the following components in parts by weight: 50 parts of polypropylene, 40 parts of polyethylene, 5.5 parts of polyethylene wax, 10 parts of glyceryl stearate, 2 parts of PP impact-resistant agent, 23 parts of filler, 0.5 parts of light stabilizer and 5 parts of antioxidant.

[0034] A production process for durable heat-sealed plastic woven square bottom bags, comprising the following steps: a. Material preparation: put the raw materials into the dry mixer according to the proportion and stir them. After stirring and mixing, draw the wire; b. Weaving: After drawing, it is dried, then weaved by a weaving machine, and then coated; c. Cutting: After lamination, it is dried, then rolled up and stored, and then cut through cutting equipment; d. Printing: After cutting, printing is carried out according to practical needs; e. Sewing: Then sew it into a square bottom bag and finally pack it.

[0035] As a further technical solution of the present invention, the cutting equipment in step c includes a shearing table 1, on which a winding roller 3 is rotatably installed, a U-shaped frame 4 is fixedly installed on the upper end of the shearing table 1, a hydraulic rod 2 is fixedly installed on the U-shaped frame 4, a cutter 10 is fixedly installed on the lower end of the hydraulic rod 2, an extrusion assembly is fixedly installed on the lower end of the hydraulic rod 2, an installation groove 19 is opened at the upper end of the shearing table 1, a clamping assembly is slidably arranged in the installation groove 19, installation plates 7 are fixedly installed on both sides of the upper end of the shearing table 1, a conveyor belt 6 is arranged on the installation plate 7, a fixed rod 5 is fixedly installed between the two conveyor belts 6, and a rotating assembly is fixedly installed on the fixed rod 5.

[0036] As a further technical solution of the present invention, the extrusion assembly includes a slide plate 13 fixedly installed on both sides of the lower end of the hydraulic rod 2, an extrusion plate 17 is arranged below the slide plate 13, a shell 16 slidably connected to the slide plate 13 is fixedly installed on the upper end of the extrusion plate 17, and a telescopic spring 25 is fixedly installed between the slide plate 13 and the shell 16.

[0037] As a further technical solution of the present invention, the clamping assembly includes a mounting block 14 which is slidably connected to the mounting groove 19, a group of clamping limit rollers 15 are rotatably arranged on the mounting block 14, a limit plate 11 is fixedly installed between the two mounting blocks 14, sliding openings 12 which are connected to the mounting groove 19 are opened on both sides of the shearing table 1, the limit plate 11 passes through the sliding opening 12, a connecting spring 18 is fixedly arranged between the limit plate 11 and the mounting groove 19, and a push rod 9 for pushing the limit plate 11 is fixedly installed on one side of the cutter 10.

[0038] As a further technical solution of the present invention, the rotating assembly includes a ring 20 fixedly mounted on the fixed rod 5, an electric push rod 8 is fixedly installed on one side of the ring 20, a group of connecting plates 24 are fixedly installed on the outside of the electric push rod 8, a gear 22 is rotatably installed on the connecting plate 24, a splint 21 is fixedly installed on one side of the gear 22, and a tooth plate 23 meshing with the gear 22 is fixedly installed on the working end of the electric push rod 8.

[0039] During operation: when cutting is required, the hydraulic rod 2 is started to push the cutter 10 downward, and at the same time, the slide plate 13, the extrusion plate 17 and the housing 16 are driven downward. The extrusion plate 17 contacts the plastic woven bag in advance to position the plastic woven bag on both sides of the cutter 10 to avoid the plastic woven bag from shifting during cutting. The hydraulic rod 2 continues to push the cutter 10 downward to cut the plastic woven bag, and the telescopic spring 25 is squeezed; When the cutter 10 moves down, it drives the push rod 9 to move down. Due to the action of the connecting spring 18, the clamping limit roller 15 moves down. After the cutting is completed, the hydraulic rod 2 controls the cutter 10 to move down, and at the same time drives the extrusion plate 17 to move up and separate from the plastic woven bag. The cutter 10 moves upward, driving the push rod 9 to push the limit plate 11 upward, and the limit plate 11 pushes the clamping limit roller 15 upward, the connecting spring 18 is stretched, and the clamping limit roller 15 clamps one end of the cut plastic woven bag, so that the clamped end of the plastic woven bag moves upward and does not contact the shearing table 1, which is convenient for subsequent clamping and pulling of materials; Then the conveyor belt 6 works to move the clamping plate 21 to one side of the clamping limit roller 15. By starting the electric push rod 8, the two clamping plates 21 can be driven to close through the cooperation of the gear 22 and the toothed plate 23 to clamp one end of the woven bag. Then the conveyor belt 6 works to realize automatic material pulling.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, it is obvious to those skilled in the art that the features thereof are equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A durable heat-sealable plastic woven square bottom bag, It is characterized in that The plastic woven square bottom bag comprises the following components in parts by weight: 40-60 parts of polypropylene, 30-60 parts of polyethylene, 4-7 parts of polyethylene wax, 4-15 parts of glyceryl stearate, 1-3 parts of PP impact resister, 15-30 parts of filler, 0.5-3 parts of light stabilizer and 1-5 parts of antioxidant.

2. A durable heat-sealable plastic woven square bottom bag according to claim 1, It is characterized in that The plastic woven square bottom bag comprises the following components in parts by weight: 40 parts of polypropylene, 30 parts of polyethylene, 4 parts of polyethylene wax, 15 parts of glyceryl stearate, 3 parts of PP impact resister, 30 parts of filler, 1.5 parts of light stabilizer and 3 parts of antioxidant.

3. A durable heat-sealable plastic woven square bottom bag according to claim 1, It is characterized in that The plastic woven square bottom bag comprises the following components in parts by weight: 60 parts of polypropylene, 60 parts of polyethylene, 7 parts of polyethylene wax, 4 parts of glyceryl stearate, 1 part of PP impact resister, 15 parts of filler, 1.8 parts of light stabilizer and 4 parts of antioxidant.

4. A durable heat-sealable plastic woven square bottom bag according to claim 1, It is characterized in that The plastic woven square bottom bag comprises the following components in parts by weight: 50 parts of polypropylene, 40 parts of polyethylene, 5.5 parts of polyethylene wax, 10 parts of glyceryl stearate, 2 parts of PP impact resister, 23 parts of filler, 0.5 parts of light stabilizer and 5 parts of antioxidant.

5. A production process for durable heat-sealed plastic woven square bottom bags. It is characterized in that The following steps are involved: a. Material preparation: put the raw materials into the dry mixer according to the proportion and stir them. After stirring and mixing, draw the wire; b. Weaving: After drawing, it is dried, then weaved by a weaving machine, and then coated; c. Cutting: After lamination, it is dried, then rolled up and stored, and then cut through cutting equipment; d. Printing: After cutting, printing is carried out according to practical needs; e. Sewing: Then sew it into a square bottom bag and finally pack it.

6. A process for producing a durable heat-sealable plastic woven square bottom bag according to claim 5, It is characterized in that The cutting equipment in step c comprises a cutting table (1), on which a winding roller (3) is rotatably mounted, a U-shaped frame (4) is fixedly mounted on the upper end of the cutting table (1), a hydraulic rod (2) is fixedly mounted on the U-shaped frame (4), a cutting knife (10) is fixedly mounted on the lower end of the hydraulic rod (2), an extrusion component is fixedly mounted on the lower end of the hydraulic rod (2), a mounting groove (19) is provided on the upper end of the cutting table (1), a clamping component is slidably arranged in the mounting groove (19), mounting plates (7) are fixedly mounted on both sides of the upper end of the cutting table (1), a conveyor belt (6) is arranged on the mounting plate (7), a fixed rod (5) is fixedly mounted between the two conveyor belts (6), and a rotating component is fixedly mounted on the fixed rod (5).

7. A process for producing a durable heat-sealable plastic woven square bottom bag according to claim 6, It is characterized in that The extrusion assembly comprises a slide plate (13) fixedly mounted on both sides of the lower end of the hydraulic rod (2), an extrusion plate (17) is arranged below the slide plate (13), a shell (16) slidably connected to the slide plate (13) is fixedly mounted on the upper end of the extrusion plate (17), and a telescopic spring (25) is fixedly mounted between the slide plate (13) and the shell (16).

8. A process for producing a durable heat-sealable plastic woven square bottom bag according to claim 7, It is characterized in that The clamping assembly comprises a mounting block (14) slidably connected to the mounting groove (19), a group of clamping limit rollers (15) are rotatably arranged on the mounting block (14), a limit plate (11) is fixedly installed between the two mounting blocks (14), sliding openings (12) connected to the mounting groove (19) are opened on both sides of the shearing table (1), the limit plate (11) passes through the sliding opening (12), a connecting spring (18) is fixedly arranged between the limit plate (11) and the mounting groove (19), and a pushing rod (9) for pushing the limit plate (11) is fixedly installed on one side of the cutter (10).

9. A process for producing a durable heat-sealable plastic woven square bottom bag according to claim 8, It is characterized in that The rotating assembly comprises a collar (20) fixedly mounted on a fixed rod (5), an electric push rod (8) fixedly mounted on one side of the collar (20), a group of connecting plates (24) fixedly mounted on the outside of the electric push rod (8), a gear (22) rotatably mounted on the connecting plate (24), a clamping plate (21) fixedly mounted on one side of the gear (22), and a toothed plate (23) meshing with the gear (22) fixedly mounted on the working end of the electric push rod (8).

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