Cutting device for plastic woven bags

Abstract

The invention discloses a cutting device for plastic woven bags, which comprises a rack, a driving mechanism, a conveying mechanism and a cutting mechanism, the conveying mechanism comprises a base, a conveying roller and a pressing roller, the conveying roller comprises a front roller and a rear roller, the base is fixedly mounted on the rack, and the pressing roller is fixedly mounted on the base. The pressing roller, the front roller and the rear roller are sequentially arranged above the base in the conveying direction of the plastic woven bags and rotationally connected with the rack, and the pressing roller, the front roller and the rear roller are driven by a driving mechanism installed in the rack to rotate. The cutting mechanism is installed on the portion, between the front roller and the rear roller, of the rack and located over the base. By the adoption of the cutting device, a thermal cutting mode is adopted, the cutting effect is good, operation of subsequent procedures is facilitated, the machining cost is effectively reduced, pungent smell can be prevented from being emitted in the cutting stage, the purposes of energy conservation and environment protection are achieved, and the cutting device is high in machining efficiency, simple in overall structure, convenient to operate and suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of woven bag cutting equipment, and in particular to a cutting device for plastic woven bags. Background Art

[0002] Plastic woven bags, also known as snakeskin bags, are a type of plastic packaging product. Their raw materials are generally various chemical plastic raw materials such as polyethylene or polypropylene. Plastic woven bags have a wide range of uses. They are mainly used for the storage and packaging of various items and are widely used in industry. During the manufacturing process, plastic woven bags are cut to obtain the appropriate size. The main production process of plastic woven bags is to use plastic raw materials, extrude films, cut, and unidirectionally stretch them into flat wires, and finally weave them through warp and weft, and then cut and sew them to obtain the product. During the cutting process, if the blade is used to cut it directly, the plastic strips at the cut will detach from each other, and there is a possibility that the woven bag will disintegrate. In order to prevent the plastic woven bag from disintegrating, it is necessary to use a hot cutting device to cut it. By using hot cutting, the phenomenon of burrs at the cut can also be effectively avoided.

[0003] The existing hot cutting devices mainly include hot cutting machines and laser cutting machines. If a laser cutting machine is used, the equipment purchase cost is relatively high, so the hot cutting machine is a more commonly used hot cutting device. If the existing hot cutting device is used, if the temperature is not well controlled, not only will the plastic be adsorbed on the heating roller, but the heating roller needs to be cleaned frequently. At the same time, when the heating roller is used for hot cutting, the plastic will burn at high temperature, thereby emitting a pungent smell. In this way, it is necessary to add environmental protection treatment equipment such as exhaust to carry out purification.

[0004] After searching, the patent document with application publication number CN109732993A discloses a plastic woven bag cutting machine with energy-saving and environmental protection functions, the patent document with application publication number CN109773892A discloses an energy-saving and environmentally friendly plastic woven bag cutting machine, and the patent document with application publication number CN116175654A discloses a plastic woven bag cutting device. From the contents disclosed in the three retrieved patent documents, a cutting device that meets the requirements of plastic woven bags is provided from different angles. Since plastic woven bags have a wide range of uses and are widely used in industries such as industry, agriculture, and food processing, the demand for plastic woven bags continues to increase. In order to meet market demand, reduce processing costs, avoid pungent smells during the cutting stage, and facilitate hot cutting of plastic woven bags, a cutting device disclosed in different prior arts is provided to meet the use requirements, which is of particular significance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to address the problems existing in the background technology, thereby providing a cutting device with a simple structure and easy operation. The use of this cutting device can not only effectively reduce the processing cost of the enterprise, but also avoid the emission of pungent smell during the cutting stage, thereby achieving the purpose of energy saving and environmental protection, so as to meet the processing and use needs of plastic woven bags, specifically a cutting device for plastic woven bags.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a cutting device for plastic woven bags, comprising a frame, a driving mechanism, a conveying mechanism and a cutting mechanism, the conveying mechanism comprising a base, a transmission roller and a pressure roller, the transmission roller comprising a front roller and a rear roller, the base is fixedly installed on the frame, the pressure roller, the front roller and the rear roller each have a pair, forming a pair of rollers, the pressure roller, the front roller and the rear roller are arranged in sequence above the base along the transmission direction of the plastic woven bag, and are rotatably connected to the frame, the pressure roller, the front roller and the rear roller are respectively driven to rotate by a driving mechanism installed in the frame; the cutting mechanism is installed on the frame between the front roller and the rear roller, and is located directly above the base, and is used for cutting the plastic woven bags transmitted by the pressure roller and conveyed to the rear roller through the front roller.

[0007] Furthermore, a cutting device for plastic woven bags described in the present invention is adopted, and the cutting mechanism includes a support frame, a first telescopic member, a cutting knife and an induction heater, the support frame is fixed on a frame between a front roller and a rear roller, the first telescopic member is fixedly connected to the support frame, and the movable end of the first telescopic member slides downward to pass through the bottom of the support frame, the cutting knife is installed at the movable end of the first telescopic member, and the induction heater is arranged in the support frame to provide induction heating power to the cutting knife.

[0008] Furthermore, a cutting device for plastic woven bags described in the present invention is adopted, wherein the cutting knife includes a knife body portion, a heat-conducting portion and a cutting portion, the knife body portion is a square structure having a accommodating cavity, and an opening communicating with the accommodating cavity is provided at the bottom of the knife body portion, the heat-conducting portion is arranged in the accommodating cavity in the knife body portion, and a slot matching the cutting portion is provided at the bottom of the heat-conducting portion, the upper end of the cutting portion passes through the opening at the bottom of the knife body portion and is connected to the heat-conducting portion through the slot, while the lower end thereof faces the base, and a fixing bolt for fixing the cutting portion is also arranged between the cutting portion and the heat-conducting portion; the cutting knife is fixed to the movable end of the first telescopic member through the knife body portion, and the induction heater is used to provide a heat source to the heat-conducting portion in the cutting knife, and transfer it to the cutting portion through the heat-conducting portion.

[0009] Furthermore, a cutting device for plastic woven bags described in the present invention is adopted, and the induction heater includes a heating power supply, a heating coil and a wire. The heating power supply is arranged in a support frame, and the heating coil is arranged in a accommodating cavity in the knife body and is located outside the heat-conducting part. The heating coil is electrically connected to the heating power supply through the wire.

[0010] Furthermore, a cutting device for plastic woven bags described in the present invention is used, wherein the heating coil is composed of two groups of rectangular serrated coils connected in series, the two groups of coils are arranged on both sides of the heat-conducting part along the length direction of the heat-conducting part, an insulating plate is provided at the wiring end of the heating coil, the wiring end of the heating coil is fixed to the heat-conducting part through the insulating plate, the wiring end of the heating coil is electrically connected to one end of the wire, and the other end of the wire passes through the knife body and is electrically connected to the output end of the heating power supply.

[0011] Furthermore, the cutting device for plastic woven bags described in the present invention is used, and the heating power supply is an IGBT induction heating power supply.

[0012] Furthermore, in the cutting device for plastic woven bags described in the present invention, the first telescopic member is any one of a pneumatic cylinder, an electric cylinder, an electric push rod and a hydraulic cylinder.

[0013] Furthermore, a cutting device for plastic woven bags described in the present invention is adopted, and the cutting device also includes a limiting mechanism, the limiting mechanism includes a limiting piece and a second telescopic piece, the base is a hollow structure with a accommodating cavity, and an opening matching the limiting piece is provided on the top surface of the base, the second telescopic piece is installed in the accommodating cavity in the base and is located directly below the opening, the limiting piece is arranged in the accommodating cavity in the base and is fixedly connected to the movable end of the second telescopic piece, and under the action of the second telescopic piece, the limiting piece can pass through the opening upward to the top of the cutting mechanism, or shrink downward to return to its initial state.

[0014] Furthermore, a cutting device for plastic woven bags described in the present invention is used, and the cutting device also includes a cooling mechanism, and the cooling mechanism includes an air cooler and an air duct. The air cooler is installed in a accommodating cavity in the base, and a plurality of ventilation holes communicated with the accommodating cavity are opened at the bottom of the base. The air outlet end of the air cooler is communicated with the limit member through the air duct.

[0015] Furthermore, a cutting device for plastic woven bags described in the present invention is adopted, the limit member is configured as a fan-shaped structure with an air guide channel, and its top surface is an arc surface structure, and its bottom surface is a plane structure, a plurality of air outlet microholes communicating with the air guide channel are provided on the top surface of the fan-shaped structure, and an air inlet hole communicating with the air guide channel is provided on the side of the fan-shaped structure, one end of the air duct is communicated with the limit member through the air inlet hole, and the other end is connected to the air outlet end of the cooling fan; under the action of the second telescopic member, the limit member passes upward through the opening on the top surface of the base to push toward the cutting mechanism, and can contact and fit with the cutting mechanism through the arc surface of its top surface; the second telescopic member is any one of a pneumatic cylinder, an electric cylinder, an electric push rod and a hydraulic cylinder.

[0016] The cutting device for plastic woven bags described in the present invention has the following beneficial effects compared with the prior art: the cutting knife is heated by an induction heater, the cutting knife is driven by the first telescopic member to move up and down in a vertical state in the conveying direction of the plastic woven bag, and the limiting member is driven by the second telescopic member to move up and down in the direction of the cutting knife, the plastic woven bag in the conveying process is supported by the arc surface of the top surface of the limiting member, and the plastic woven bag is thermally cut by the cutting part in the cutting knife. After the cutting is completed, the cooling air is finally conveyed to the air guide channel in the limiting member through the air duct through the configured cooling mechanism under the action of the cold air blower, and finally blown to the plastic woven bag above the limiting member through the air outlet micropores, which can accelerate the plastic woven bag to separate from the limiting member and the cutting knife, which can not only effectively prevent the problem of plastic adsorption on the cutting knife, but also avoid the problem of plastic burning at high temperature.

[0017] It can be seen that the cutting device described in the present invention adopts a thermal cutting method, and there are no burrs at the opening, which not only has a good cutting effect, but is also beneficial to the operation of subsequent processes, effectively reducing the processing cost of the enterprise, and avoiding the emission of pungent smell during the cutting stage, thereby achieving the purpose of energy saving and environmental protection. It has high processing efficiency and is conducive to large-scale production. Its overall structure is simple and easy to operate, and it is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 A schematic diagram of the enlarged local structure at point A in the middle; Figure 3 yes Figure 1 A magnified schematic diagram of the local structure at B in the middle; Figure 4 It is a schematic diagram of the installation structure of the heating coil described in the present invention; Figure 5 The present invention is a schematic diagram of the structure of the cutting device when in use Figure 1 ; Figure 6 The present invention is a schematic diagram of the structure of the cutting device when in use Figure 2 .

[0020] As shown in the figure: 1-base, 2-pressure roller, 3-front roller, 4-rear roller, 5-support frame, 6-first telescopic member, 7-cutting knife, 71-knife body, 72-heat conducting part, 721-slot, 73-cutting part, 74-fixing bolt, 8-induction heater, 81-heating power supply, 82-heating coil, 83-conducting wire, 84-insulating plate, 9-limiting member, 91-air outlet microhole, 10-second telescopic member, 11-air cooler, 12-air duct, 13-plastic woven bag. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", etc. quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. Example 1

[0025] like Figures 1 to 4 As shown, the present embodiment provides a cutting device for plastic woven bags, comprising a frame, a driving mechanism, a conveying mechanism and a cutting mechanism, wherein the conveying mechanism comprises a base 1, a transmission roller and a pressing roller 2, wherein the transmission roller comprises a front roller 3 and a rear roller 4, wherein the base 1 is fixedly mounted on the frame, wherein each of the pressing rollers 2, the front roller 3 and the rear roller 4 has a pair, forming a pair of rollers, wherein the pressing rollers 2, the front roller 3 and the rear roller 4 are sequentially arranged above the base 1 along the transmission direction of the plastic woven bags, and are rotationally connected to the frame, wherein the pressing rollers 2, the front roller 3 and the rear roller 4 are respectively driven to rotate by a driving mechanism installed in the frame; wherein the cutting mechanism is installed on the frame between the front roller 3 and the rear roller 4, and is located directly above the base 1, and is used for cutting the plastic woven bags transmitted by the pressing roller 2 and conveyed to the rear roller 4 through the front roller 3. Among them, the frame and driving mechanism are not drawn in the figure. At the same time, a control system for controlling the driving mechanism is also configured. The control system adopts the existing PLC controller, and the driving mechanism includes a driving motor for providing power to the clamping roller 2, the front roller 3 and the rear roller 4 respectively. It is also configured with a clamping and adjusting device. The clamping and adjusting device is used to adjust the gap size between two rollers among the clamping roller 2, the front roller 3 and the rear roller 4 respectively, so as to meet the cutting requirements of plastic woven bags of different thicknesses. During the specific installation process, the two rollers among the clamping roller 2, the front roller 3 and the rear roller 4 can be installed on the frame in sequence along the transmission direction of the plastic woven bag in combination with the height of the base 1.

[0026] Furthermore, a cutting device for plastic woven bags described in this embodiment is adopted, and the cutting mechanism includes a support frame 5, a first telescopic member 6, a cutting knife 7 and an induction heater 8. The support frame 5 is fixed on the frame between the front roller 3 and the rear roller 4, the first telescopic member 6 is fixedly connected to the support frame 5, and the movable end of the first telescopic member 6 slides downward to pass under the support frame 5, the cutting knife 7 is installed at the movable end of the first telescopic member 6, and the induction heater 8 is arranged in the support frame 5, for providing induction heating power to the cutting knife 7.

[0027] The cutting knife 7 includes a knife body portion 71, a heat conducting portion 72 and a cutting portion 73. The knife body portion 71 is a square structure with a accommodating cavity, and an opening communicating with the accommodating cavity is provided at the bottom of the knife body portion 71. The heat conducting portion 72 is arranged in the accommodating cavity in the knife body portion 71, and a slot 721 matching the cutting portion 73 is provided at the bottom of the heat conducting portion 72. The upper end of the cutting portion 73 passes through the opening at the bottom of the knife body portion 71 and is connected to the heat conducting portion 72 through the slot 721, while the lower end thereof faces the base, and a fixing bolt 74 for fixing the cutting portion 73 is also arranged between the cutting portion 73 and the heat conducting portion 72; the cutting knife 7 is fixed to the movable end of the first telescopic member 6 through the knife body portion 71, and the induction heater 8 is used to provide a heat source to the heat conducting portion 72 in the cutting knife 7, and transmit it to the cutting portion 73 through the heat conducting portion 72.

[0028] The induction heater 8 includes a heating power supply 81, a heating coil 82 and a wire 83. The heating power supply 81 is arranged in the support frame 5, and the heating coil 82 is arranged in the accommodating cavity in the blade body 71 and is located outside the heat conducting portion 72. The heating coil 82 is electrically connected to the heating power supply 81 through the wire 83. The heating power supply 81 is an IGBT induction heating power supply. Since the IGBT induction heating power supply is a common induction heating device in the prior art, it has the advantages of efficient heating and precise control, and can adjust the working frequency and current according to different heating requirements.

[0029] Furthermore, a cutting device for plastic woven bags described in this embodiment is used, wherein the first telescopic member 6 is any one of a pneumatic cylinder, an electric cylinder, an electric push rod and a hydraulic cylinder; and the heating coil 82 is composed of two groups of rectangular serrated coils connected in series, and the two groups of coils are arranged on both sides of the heat-conducting part 72 along the length direction of the heat-conducting part 72, and an insulating plate 84 is provided at the wiring end of the heating coil 82, and the wiring end of the heating coil 82 is fixed to the heat-conducting part 72 through the insulating plate 84, and the wiring end of the heating coil 82 is electrically connected to one end of the wire 83, and the other end of the wire 83 passes through the knife body 71 and is electrically connected to the output end of the heating power supply 81. Example 2

[0030] This embodiment is based on the embodiment 1. In order to facilitate the cutting part 73 in the cutting mechanism to cut the transported plastic woven bag 13, the cutting device provided by this embodiment is adopted. The cutting device also includes a limiting mechanism. The limiting mechanism includes a limiting member 9 and a second telescopic member 10. The base 1 is a hollow structure with a accommodating cavity. An opening matching the limiting member 9 is provided on the top surface of the base 1. The second telescopic member 10 is installed in the accommodating cavity in the base 1 and is located directly below the opening. The limiting member 9 is arranged in the accommodating cavity in the base 1 and is fixedly connected to the movable end of the second telescopic member 10. Under the action of the second telescopic member 10, the limiting member 9 can pass through the opening upward to the top of the cutting mechanism, or shrink downward to restore to its initial state. Example 3

[0031] This embodiment is based on the embodiment 2. In order to facilitate the separation of the cut plastic woven bags 13, prevent the plastic from being adsorbed on the cutting knife 7, and avoid the problem of plastic burning at high temperature, the cutting device provided by this embodiment is adopted. The cutting device also includes a cooling mechanism. The cooling mechanism includes an air cooler 11 and an air duct 12. The air cooler 11 is installed in a accommodating cavity in the base 1. A plurality of ventilation holes communicating with the accommodating cavity are opened at the bottom of the base 1. The air outlet end of the air cooler 11 is communicated with the limit member 9 through the air duct 12.

[0032] Among them, the limit member 9 is configured as a fan-shaped structure with an air guide channel, and its top surface is an arc surface structure, while its bottom surface is a plane structure. A plurality of air outlet microholes 91 communicating with the air guide channel are provided on the top surface of the fan-shaped structure, and an air inlet hole communicating with the air guide channel is provided on the side of the fan-shaped structure. One end of the air duct is communicated with the limit member 9 through the air inlet hole, and the other end is connected to the air outlet end of the cooling fan 11; under the action of the second telescopic member 10, the limit member 9 passes through the opening on the top surface of the base 1 upward to the cutting mechanism, and can contact and fit with the cutting mechanism through the arc surface of its top surface; the second telescopic member 10 is any one of a pneumatic cylinder, an electric cylinder, an electric push rod and a hydraulic cylinder.

[0033] The cutting device for plastic woven bags described in the present invention is used. In order to conveniently use the existing air source of the enterprise and reduce the processing cost, the first telescopic member 6 and the second telescopic member 10 can both use cylinders. At the same time, it is also necessary to use the existing control system to control the working state of the driving mechanism, the heating power supply 81, the first telescopic member 6, the second telescopic member 10 and the cold air blower 11. Since the driving mechanism, the heating power supply 81, the first telescopic member 6, the second telescopic member 10 and the cold air blower 11 are all commonly used equipment in the prior art, the present invention does not make a detailed description of them, as long as the use requirements are met. The basic working principle of the induction heater 8 is to use alternating current to generate an alternating magnetic field. This alternating magnetic field generates eddy currents inside the metal conductor therein, so that the metal workpiece heats up rapidly. The heating effect can be determined by the frequency, current and magnetic field. The heating temperature of the heat conducting part 72 in the cutting knife 7 can be determined according to the actual cutting situation, and then the heat conducting part 72 is transferred to the cutting part 73, and finally the cutting part 73 can be used to achieve thermal cutting. Compared with the existing infrared heating tube method, it can reduce energy consumption and greatly improve heating efficiency.

[0034] In a specific application process, the cutting device described in the present invention is used to heat the cutting knife 7 through the induction heater 8, and the first telescopic member 6 is used to drive the cutting knife 7 to move up and down in a vertical state in the conveying direction of the plastic woven bag 13, and the second telescopic member 10 is used to drive the limiting member 9 to move up and down in the direction of the cutting knife 7, and the plastic woven bag 13 in the conveying process is supported by the arc surface of the top surface of the limiting member 9, and the plastic woven bag 13 is thermally cut by the cutting part 73 in the cutting knife 7. After the cutting is completed, the cooling air is finally passed through the configured cooling mechanism under the action of the cooling fan 11. The air duct 12 is transported to the air guide channel in the limiter 9, and finally blown to the plastic woven bag 13 above the limiter 9 through the air outlet micropores 91, which can accelerate the plastic woven bag 13 to separate from the limiter 9 and the cutting knife 7, thereby effectively preventing the problem of plastic adsorbing on the cutting knife 7, and also avoiding the problem of plastic burning at high temperature. In this way, the problem of plastic impurities attached to the surface of the cutting part 73 can be effectively removed, making the surface of the cutting part 73 cleaner, and more conducive to the reuse of the cutting part 73. The cutting part of the plastic woven bag 13 can also be cooled and dissipated, thereby improving the efficiency of hot cutting. In addition, since the cutting part 73 and the heat conducting part 72 in the cutting knife 7 are connected by fixing bolts 74 to form a detachable connection, it is also convenient to replace and repair the worn cutting part 73, thereby ensuring the cutting effect.

[0035] To sum up, the cutting device described in the present invention adopts a thermal cutting method, and there are no burrs at the opening. Not only is the cutting effect good, but it is also beneficial to the operation of subsequent processes, effectively reducing the processing cost of the enterprise, and avoiding the emission of pungent smell during the cutting stage, thereby achieving the purpose of energy saving and environmental protection. It has high processing efficiency and is conducive to large-scale production. Its overall structure is simple and easy to operate, and it is suitable for promotion and application.

[0036] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0037] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. The above description is only a preferred implementation method of the present invention and does not limit the present invention. Any minor modifications, equivalent substitutions and improvements made according to the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.

Claims

1. A cutting device for plastic woven bags, comprising a frame, a driving mechanism, a conveying mechanism and a cutting mechanism, characterized in that: The conveying mechanism comprises a base (1), a transmission roller and a pressure roller (2), wherein the transmission roller comprises a front roller (3) and a rear roller (4), wherein the base (1) is fixedly mounted on a frame, wherein each of the pressure rollers (2), the front rollers (3) and the rear rollers (4) has a pair of rollers, forming a pair of rollers, wherein the pressure rollers (2), the front rollers (3) and the rear rollers (4) are sequentially arranged above the base (1) along the transmission direction of the plastic woven bag and are rotatably connected to the frame, wherein the pressure rollers (2), the front rollers (3) and the rear rollers (4) are respectively driven to rotate by a driving mechanism mounted in the frame; wherein the cutting mechanism is mounted on the frame between the front rollers (3) and the rear rollers (4), and is located directly above the base (1), and is used for cutting the plastic woven bag that is transmitted by the pressure rollers (2) and delivered to the rear rollers (4) through the front rollers (3).

2. A cutting device for plastic woven bags according to claim 1, characterized in that: The cutting mechanism comprises a support frame (5), a first telescopic member (6), a cutting knife (7) and an induction heater (8); the support frame (5) is fixed on a frame between a front roller (3) and a rear roller (4); the first telescopic member (6) is fixedly connected to the support frame (5), and the movable end of the first telescopic member (6) slides downward to penetrate below the support frame (5); the cutting knife (7) is mounted on the movable end of the first telescopic member (6); and the induction heater (8) is arranged in the support frame (5) for providing induction heating power to the cutting knife (7).

3. A cutting device for plastic woven bags according to claim 2, characterized in that: The cutting knife (7) comprises a knife body (71), a heat conducting part (72) and a cutting part (73); the knife body (71) is a square structure having a receiving cavity, and an opening communicating with the receiving cavity is provided at the bottom of the knife body (71); the heat conducting part (72) is arranged in the receiving cavity of the knife body (71), and a slot (721) matching with the cutting part (73) is provided at the bottom of the heat conducting part (72); the upper end of the cutting part (73) passes through the opening at the bottom of the knife body (71). The cutting blade (7) is connected to the heat-conducting portion (72) through a slot (721), and its lower end faces the base. A fixing bolt (74) for fixing the cutting portion (73) is also arranged between the cutting portion (73) and the heat-conducting portion (72); the cutting blade (7) is fixed to the movable end of the first telescopic member (6) through a blade body (71); the induction heater (8) is used to provide a heat source to the heat-conducting portion (72) in the cutting blade (7), and transmit the heat source to the cutting portion (73) through the heat-conducting portion (72).

4. A cutting device for plastic woven bags according to claim 3, characterized in that: The induction heater (8) comprises a heating power source (81), a heating coil (82) and a wire (83); the heating power source (81) is arranged in the support frame (5), and the heating coil (82) is arranged in a receiving cavity in the blade body (71) and is located outside the heat conducting portion (72); the heating coil (82) is electrically connected to the heating power source (81) via the wire (83).

5. A cutting device for plastic woven bags according to claim 4, characterized in that: The heating coil (82) is composed of two groups of rectangular sawtooth-shaped coils connected in series, and the two groups of coils are arranged on both sides of the heat-conducting part (72) along the length direction of the heat-conducting part (72). An insulating plate (84) is provided at the connection end of the heating coil (82), and the connection end of the heating coil (82) is fixed to the heat-conducting part (72) through the insulating plate (84). The connection end of the heating coil (82) is electrically connected to one end of a wire (83), and the other end of the wire (83) passes through the blade body (71) and is electrically connected to the output end of the heating power supply (81).

6. A cutting device for plastic woven bags according to claim 5, characterized in that: The heating power supply (81) is an IGBT induction heating power supply.

7. A cutting device for plastic woven bags according to claim 2, characterized in that: The first telescopic member (6) is any one of a pneumatic cylinder, an electric cylinder, an electric push rod and a hydraulic cylinder.

8. A cutting device for plastic woven bags according to claim 1, characterized in that: The cutting device further comprises a limiting mechanism, wherein the limiting mechanism comprises a limiting member (9) and a second telescopic member (10); the base (1) is a hollow structure having a housing cavity; an opening matching the limiting member (9) is provided on the top surface of the base (1); the second telescopic member (10) is installed in the housing cavity in the base (1) and is located directly below the opening; the limiting member (9) is arranged in the housing cavity in the base (1) and is fixedly connected to the movable end of the second telescopic member (10); under the action of the second telescopic member (10), the limiting member (9) can pass through the opening upwards to the top of the cutting mechanism, or shrink downwards to restore to an initial state.

9. A cutting device for plastic woven bags according to claim 8, characterized in that: The cutting device also includes a cooling mechanism, which includes an air cooler (11) and an air duct (12). The air cooler (11) is installed in a accommodating cavity in the base (1), and a plurality of ventilation holes communicating with the accommodating cavity are provided at the bottom of the base (1). The air outlet end of the air cooler (11) is communicated with the limiting member (9) through the air duct (12).

10. A cutting device for plastic woven bags according to claim 9, characterized in that: The limiting member (9) is configured as a fan-shaped structure having an air guide channel, and its top surface is an arc surface structure, while its bottom surface is a plane structure. A plurality of air outlet microholes (91) communicating with the air guide channel are provided on the top surface of the fan-shaped structure, and an air inlet hole communicating with the air guide channel is provided on the side surface of the fan-shaped structure. One end of the air duct is communicated with the limiting member (9) through the air inlet hole, while the other end is connected to the air outlet end of the cooling fan (11); under the action of the second telescopic member (10), the limiting member (9) passes through the top surface opening of the base (1) upwardly toward the cutting mechanism, and can contact and fit with the cutting mechanism through the arc surface of its top surface; the second telescopic member (10) is any one of a pneumatic cylinder, an electric cylinder, an electric push rod and a hydraulic cylinder.

Images