Waste mulching film recycling and impurity removing mechanism

Abstract

The utility model relates to the technical field of impurity removal mechanisms, in particular to a waste mulching film recycling and impurity removal mechanism. The technical problems that in the use process of an impurity removal mechanism, waste mulching films need to be manually carried and treated due to the fact that most of the impurity removal mechanisms only adopt a single impurity removal mechanism for recycling and impurity removal, time and labor are wasted, and spraying, brushing, vibrating and impurity blowing cannot be integrated for efficient impurity removal are solved. According to the technical scheme, the waste mulching film recycling and impurity removing mechanism comprises a device bottom plate, a conveying belt, a water spraying and softening assembly, a surface brushing assembly, a pressing and fixing assembly, a vibration impurity blowing assembly and a winding assembly. According to the utility model, the water spraying softening assembly is arranged to soften soil and wet a mulching film, the surface brushing assembly is utilized to brush large impurities and soil on the surface of the waste mulching film, and meanwhile, the vibration impurity blowing assembly is utilized to loosen and fall off the impurities on the mulching film through vibration and blow away fine particles and light substances.

Description

Technical Field

[0001] The utility model relates to the technical field of impurity removal mechanisms, in particular to a waste mulch film recycling and impurity removal mechanism. Background Art

[0002] The recycling and impurity removal mechanisms currently used for waste mulch films on the market are relatively simple in function. Most of them only use a single impurity removal mechanism for recycling and impurity removal, and the waste mulch films need to be transported and processed manually, which is time-consuming and labor-intensive. Therefore, there is an urgent need to set up an impurity removal mechanism that can integrate spraying, brushing, vibration and blowing out impurities, which can quickly and efficiently recycle and remove impurities from the waste mulch films, further improving the impurity removal speed of the waste mulch films. Utility Model Content

[0003] In order to overcome the problem that in the process of using the impurity removal mechanism, most of them only use a single impurity removal mechanism for recycling and impurity removal, and the waste ground film needs to be transported and processed manually, which is time-consuming and labor-intensive, and cannot integrate spraying, brushing, vibration and blowing out impurities for efficient impurity removal.

[0004] The technical scheme of the utility model is: a waste ground film recycling and impurity removal mechanism, comprising a device bottom plate, a conveyor belt, a water spray softening component, a surface cleaning component, a pressing and fixing component, a vibration impurity blowing component, and a winding component; a conveyor belt is installed on the upper end of the device bottom plate; a water spray softening component for softening soil and moistening the ground film, which is helpful for subsequent cleaning work, is installed above the conveyor belt; a surface cleaning component for brushing off large impurities and soil on the surface is installed behind the water spray softening component; two groups of pressing and fixing components for fixing the ground film are installed behind the conveyor belt; a vibration impurity blowing component for loosening and falling off impurities on the ground film by vibration and blowing away fine particles and light substances is installed between the two groups of pressing and fixing components; a winding component is installed behind the vibration impurity blowing component.

[0005] Preferably, the waste mulch film can be placed on a conveyor belt, and a water spray softening component can be used to soften the soil and moisten the mulch film, which is helpful for subsequent cleaning work. The surface cleaning component can be used to brush off large impurities and soil on the surface of the waste mulch film, and the pressing and fixing component can be used to press and fix the waste mulch film. At the same time, the vibration blowing component can loosen and fall off the impurities on the mulch film through vibration, and blow away fine particles and light materials, so that the winding component can recycle and wind up the cleaned waste mulch film.

[0006] Preferably, the water spray softening assembly includes a water tank, a supporting frame, a water pump, a water delivery pipe, a water branch pipe, a water spray transverse pipe and a water spray head; a water tank is installed on one side of the upper end of the device bottom plate; a water pump is installed on the upper end of the water tank; a water delivery pipe is fixedly connected to the upper end of the device bottom plate; a water branch pipe is installed on the water delivery end of the water pump; a water spray transverse pipe is connected to the outer side of the water branch pipe through an electromagnetic valve; a water spray head is installed at the lower end of the water spray transverse pipe, and the water pump is started so that the tax in the water tank can enter the water branch pipe through the water delivery pipe, and then the water spray head under the water spray transverse pipe can soften the soil and moisten the ground film, which helps the subsequent cleaning work.

[0007] Preferably, the surface cleaning brush assembly includes a reinforcement bracket plate, a control guide frame plate, a first servo motor, an adjusting screw, a screw slider, a limit linkage block, an installation upper plate, a cleaning brush, an impurity outlet and a first collecting frame; a reinforcement bracket plate is installed above the conveyor belt; a control guide frame plate is installed at the upper end of the reinforcement bracket plate; a first servo motor is installed at the side end of the control guide frame plate; an adjusting screw is provided at the output end of the first servo motor; a screw slider is connected to the outer side of the adjusting screw for transmission; the lower end of the screw slider is fixedly connected to the limit linkage block; an installation upper plate is installed at the lower end of the limit linkage block; a cleaning brush is installed at the lower end of the installation upper plate; an impurity outlet is opened at the side end of the conveyor belt; and a first collecting frame is installed at the side end of the conveyor belt. When it is necessary to clean large impurities and soil on the surface of the waste film, starting the first servo motor can drive the adjusting screw to move, so that the screw slider can drive the limit linkage block to move laterally, so that the cleaning brush under the installation upper plate can clean the large impurities and soil on the surface of the waste film, so that the impurities can enter the first collection frame from the impurity outlet.

[0008] Preferably, the pressing and fixing assembly includes a support plate, a stabilizing support rod, a fixed upper plate, a hydraulic cylinder and a protective pressure plate; the upper end of the device bottom plate is fixedly connected to the support plate; stabilizing support rods are fixedly connected on both sides of the upper end of the support plate; a fixed upper plate is installed on the upper end of the stabilizing support rod; a hydraulic cylinder is installed on the upper end of the fixed upper plate; a protective pressure plate is installed on the movable end of the hydraulic cylinder, and starting the hydraulic cylinder can drive the protective pressure plate to move up and down, so that the waste ground film can be pressed and fixed.

[0009] Preferably, the vibration impurity blowing component includes a fixed side plate, a vibration motor, a vibration connecting rod, a vibration filter screen, a vibration block, a limit baffle, a vibration spring, a second collection frame, a third collection frame, and a debris removal fan; the upper end of the device bottom plate is fixedly connected to the fixed side plate; the side end of the fixed side plate is installed with a vibration motor; the output end of the vibration motor is provided with a vibration connecting rod; the side end of the vibration connecting rod is installed with a vibration filter screen; both sides of the vibration filter screen are fixedly connected with vibration blocks, and the vibration motor is started so that the vibration connecting rod can drive the vibration filter screen to vibrate, so that impurities on the ground film are loosened and fall off.

[0010] Preferably, both ends of the inner side of the fixed side plate are fixedly connected to the limit baffle; the upper and lower ends of the vibration block are equipped with vibration springs whose other ends are connected to the limit baffle; a second collecting frame is installed under the vibrating filter plate; a third collecting frame is installed at the upper end of the fixed side plate; a dust removal fan is installed at the bottom end of the third collection frame, and when the dust removal fan is started at the same time, fine particles and light materials can be blown away.

[0011] Preferably, the winding assembly includes an installation side plate, a second servo motor, a rotating rod and a limited winding roller; the installation side plates are fixedly connected to both sides of the upper end of the device bottom plate; the second servo motor is installed on the side end of the installation side plate; the output end of the second servo motor is provided with a rotating rod; the limited winding roller is installed on the outer side of the rotating rod, and when the cleaned waste film needs to be rolled up, the second servo motor is started so that the rotating rod can drive the limited winding roller to rotate, thereby achieving the effect of rapid winding.

[0012] Beneficial effects of the utility model:

[0013] 1. The water spray softening component can soften the soil and moisten the ground film, which is helpful for subsequent cleaning work. The surface cleaning component can brush off large impurities and soil on the surface of the waste ground film, and the pressing and fixing component can press and fix the waste ground film. At the same time, the vibration blowing component can loosen and fall off the impurities on the ground film through vibration, and blow away the fine particles and light materials, so that the reeling component can recycle and reel the cleaned waste ground film. Compared with the recycling and impurity removal mechanism used for waste ground film on the market, the function is relatively simple. Most of them only use a single impurity removal mechanism for recycling and impurity removal, and the waste ground film needs to be transported and processed manually, which is time-consuming and labor-intensive. This impurity removal mechanism can achieve the effect of efficient and stable impurity removal;

[0014] 2. Start the water pump so that the tax in the water tank can enter the water branch pipe through the water delivery pipe, so that the sprinkler head under the sprinkler horizontal pipe can soften the soil and moisten the ground film, which is helpful for subsequent cleaning work;

[0015] 3. When it is necessary to clean large impurities and soil on the surface of the waste mulch, starting the first servo motor can drive the adjusting screw to move, so that the screw slider can drive the limit linkage block to move horizontally, so that the cleaning brush installed under the upper plate can clean the large impurities and soil on the surface of the waste mulch, so that the impurities can enter the first collection frame from the impurity outlet;

[0016] 4. Starting the hydraulic cylinder can drive the protective pressure plate to move up and down, which can press and fix the waste mulch. Starting the vibration motor allows the vibration connecting rod to drive the vibration filter plate to vibrate, loosening and falling off the impurities on the mulch. At the same time, starting the impurity removal fan can blow away fine particles and light materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 What is shown is a three-dimensional structural schematic diagram of the impurity removal mechanism of the utility model;

[0018] Figure 2 The three-dimensional structure diagram of the water spray softening component of the impurity removal mechanism of the utility model is shown;

[0019] Figure 3 What is shown is a three-dimensional structural schematic diagram of the surface cleaning component of the impurity removal mechanism of the utility model;

[0020] Figure 4 The three-dimensional structure diagram of the vibrating filter screen plate of the impurity removal mechanism of the utility model is shown;

[0021] Figure 5 What is shown is a three-dimensional structural schematic diagram of the limiting winding roller of the impurity removal mechanism of the utility model.

[0022] Explanation of the reference numerals: 1. bottom plate of the device; 2. conveyor belt; 3. water spray softening assembly; 4. surface cleaning assembly; 5. pressing and fixing assembly; 6. vibration blowing assembly; 7. winding assembly; 301. water tank; 302. support frame plate; 303. water pump; 304. water delivery pipe; 305. water branch pipe; 306. water spray transverse pipe; 307. water spray head; 401. reinforcement bracket plate; 402. control guide frame plate; 403. first servo motor; 404. adjusting screw rod; 405. screw rod slider; 406. limit linkage block; 407. installation of upper plate; 408. cleaning Brush; 409, impurity outlet; 410, first collection frame; 501, support plate; 502, stabilizing support rod; 503, fixed upper plate; 504, hydraulic cylinder; 505, protective pressure plate; 601, fixed side plate; 602, vibration motor; 603, vibration connecting rod; 604, vibration filter screen; 605, vibration block; 606, limit baffle; 607, vibration spring; 608, second collection frame; 609, third collection frame; 610, impurity removal fan; 701, installation side plate; 702, second servo motor; 703, rotating rod; 704, limit winding roller. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] See also Figure 1The utility model provides an embodiment: a waste mulch film recycling and impurity removal mechanism, comprising a device bottom plate 1, a conveyor belt 2, a water spray softening component 3, a surface cleaning component 4, a pressing and fixing component 5, a vibration impurity blowing component 6, and a winding component 7; a conveyor belt 2 is installed at the upper end of the device bottom plate 1; a water spray softening component 3 is installed above the conveyor belt 2 for softening the soil and moistening the mulch film, which is helpful for subsequent cleaning work; a surface cleaning component 4 for brushing off large impurities and soil on the surface is installed behind the water spray softening component 3; two groups of pressing and fixing components 5 for fixing the mulch film are installed behind the conveyor belt 2; a vibrating impurity blowing component 6 for vibrating the mulch film is installed between the two groups of pressing and fixing components 5 The vibrating impurity blowing component 6 can loosen and fall off the impurities on the film, and blow away the fine particles and light substances; a winding component 7 is installed behind the vibrating impurity blowing component 6, which can place the waste film on the conveyor belt 2, and the water spray softening component 3 can soften the soil and moisten the film, which is helpful for subsequent cleaning work, and the surface cleaning component 4 can brush off the large impurities and soil on the surface of the waste film, and the pressing and fixing component 5 can press and fix the waste film, and at the same time, the vibrating impurity blowing component 6 can loosen and fall off the impurities on the film through vibration, and blow away the fine particles and light substances, so that the winding component 7 can recycle and wind up the cleaned waste film.

[0025] See also Figure 2-3In this embodiment, the water spray softening assembly 3 includes a water tank 301, a support frame 302, a water pump 303, a water delivery pipe 304, a water branch pipe 305, a water spray transverse pipe 306 and a water spray head 307; a water tank 301 is installed on one side of the upper end of the device bottom plate 1; a water pump 303 is installed on the upper end of the water tank 301; a water delivery pipe 304 is fixedly connected to the upper end of the device bottom plate 1; a water branch pipe 305 is installed on the water delivery end of the water pump 303; a water spray transverse pipe 306 is connected to the outer side of the water branch pipe 305 through a solenoid valve; a water spray transverse pipe 306 is installed at the lower end of the water spray transverse pipe 306 There is a water spray head 307, start the water pump 303, so that the tax in the water tank 301 can enter the water branch pipe 305 through the water delivery pipe 304, so that the water spray head 307 under the water spray cross pipe 306 can soften the soil and moisten the ground film, which is helpful for subsequent cleaning work. The surface cleaning component 4 includes a reinforcement bracket plate 401, a control guide frame plate 402, a first servo motor 403, an adjustment screw rod 404, a screw rod slider 405, a limit linkage block 406, an installation plate 407, a cleaning brush 408, an impurity outlet 409 and a first A collecting frame 410; a reinforcement bracket plate 401 is installed above the conveyor belt 2; a control guide frame plate 402 is installed on the upper end of the reinforcement bracket plate 401; a first servo motor 403 is installed on the side end of the control guide frame plate 402; an adjusting screw rod 404 is provided at the output end of the first servo motor 403; a screw rod slider 405 is connected to the outer side of the adjusting screw rod 404; a limited position linkage block 406 is fixedly connected to the lower end of the screw rod slider 405; a mounting upper plate 407 is installed at the lower end of the limited position linkage block 406; a cleaning brush is installed at the lower end of the mounting upper plate 407 408; an impurity outlet 409 is provided at the side end of the conveyor belt 2; a first collecting frame 410 is installed at the side end of the conveyor belt 2. When it is necessary to clean large impurities and soil on the surface of the waste mulch, starting the first servo motor 403 can drive the adjusting screw 404 to move, so that the screw slider 405 can drive the limit linkage block 406 to move laterally, so that the cleaning brush 408 installed under the upper plate 407 can clean the large impurities and soil on the surface of the waste mulch, so that the impurities can enter the first collecting frame 410 from the impurity outlet 409.

[0026] See also Figure 4-5In this embodiment, the pressing and fixing assembly 5 includes a support plate 501, a stabilizing support rod 502, a fixed upper plate 503, a hydraulic cylinder 504 and a protective pressure plate 505; the upper end of the device bottom plate 1 is fixedly connected to the support plate 501; both sides of the upper end of the support plate 501 are fixedly connected; the upper end of the stabilizing support rod 502 is installed with a fixed upper plate 503; the upper end of the fixed upper plate 503 is installed with a hydraulic cylinder 504; the movable end of the hydraulic cylinder 504 is installed with a protective pressure plate 505, and starting the hydraulic cylinder 504 can drive the protective pressure plate 505 to move up and down, so as to press and fix the waste mulch. The vibration impurity blowing component 6 includes a fixed side plate 601, a vibration motor 602, a vibration connecting rod 603, a vibration filter screen 604, a vibration block 605, a limit baffle 606, a vibration spring 607, a second collection frame 608, a third collection frame 609, and an impurity removal fan 610; the upper end of the device bottom plate 1 is fixedly connected to the fixed side plate 601; the side end of the fixed side plate 601 is installed with a vibration motor 602; the output end of the vibration motor 602 is provided with a vibration connecting rod 603; the side end of the vibration connecting rod 603 is installed with a vibration filter screen 604; both sides of the vibration filter screen 604 are fixedly connected with vibration blocks 605, start the vibration motor 602, so that the vibration connecting rod 603 can drive the vibration filter plate 604 to vibrate, so that the impurities on the ground film are loosened and fall off, and the two ends of the inner side of the fixed side plate 601 are fixedly connected to the limit baffle 606; the upper and lower ends of the vibration block 605 are installed with a vibration spring 607 connected to the limit baffle 606 at the other end; a second collection frame 608 is installed under the vibration filter plate 604; a third collection frame 609 is installed at the upper end of the fixed side plate 601; a dust removal fan 610 is installed at the bottom of the third collection frame 609, and the dust removal fan 610 is started at the same time to remove fine particles and Light materials are blown away, and the winding component 7 includes an installation side plate 701, a second servo motor 702, a rotating rod 703 and a limited winding roller 704; the installation side plates 701 are fixedly connected on both sides of the upper end of the device bottom plate 1; the second servo motor 702 is installed on the side end of the installation side plate 701; the output end of the second servo motor 702 is provided with a rotating rod 703; the limited winding roller 704 is installed on the outer side of the rotating rod 703, and when the cleaned waste film needs to be wound up, the second servo motor 702 is started, so that the rotating rod 703 can drive the limited winding roller 704 to rotate, thereby achieving the effect of rapid winding.

[0027] When working, start the water pump 303, so that the tax in the water tank 301 can enter the water branch pipe 305 through the water delivery pipe 304, so that the water spray head 307 under the water spray horizontal pipe 306 can soften the soil and moisten the ground film, which is helpful for the subsequent cleaning work;

[0028] When it is necessary to clean the large impurities and soil on the surface of the waste mulch film, the first servo motor 403 is started to drive the adjusting screw 404 to move, so that the screw slider 405 can drive the limit linkage block 406 to move horizontally, so that the cleaning brush 408 installed under the upper plate 407 can clean the large impurities and soil on the surface of the waste mulch film, so that the impurities can enter the first collection frame 410 from the impurity outlet 409;

[0029] Then, the hydraulic cylinder 504 is started to drive the protective pressing plate 505 to move up and down, so as to press and fix the waste ground film, and then the vibration motor 602 is started, so that the vibration connecting rod 603 can drive the vibration filter plate 604 to vibrate, so that the impurities on the ground film are loosened and fall off, and at the same time, the impurity removal fan 610 is started to blow away the fine particles and light materials;

[0030] When the cleaned waste ground film needs to be rolled up, the second servo motor 702 is started, so that the rotating rod 703 can drive the limited winding roller 704 to rotate, thereby achieving a fast winding effect.

[0031] Through the above steps, the water spray softening component 3 can soften the soil and moisten the ground film, which is helpful for subsequent cleaning work. The surface brushing component 4 can brush off large impurities and soil on the surface of the waste ground film, and the pressing and fixing component 5 can press and fix the waste ground film. At the same time, the vibration blowing component 6 can loosen and fall off the impurities on the ground film through vibration, and blow away fine particles and light materials, so that the winding component 7 can recycle and rewind the cleaned waste ground film, so as to solve the problem that in the process of using the impurity removal mechanism, most of them only use a single impurity removal mechanism for recycling and impurity removal, and need to manually transport and process the waste ground film, which is time-consuming and labor-intensive, and cannot integrate spraying, brushing, vibration and blowing out impurities for efficient impurity removal.

[0032] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A waste mulch film recycling and impurity removal mechanism, comprising a device bottom plate (1); characterized in that: The device also comprises a conveyor belt (2), a water-spraying softening component (3), a surface cleaning component (4), a pressing and fixing component (5), a vibration impurity blowing component (6), and a winding component (7); the conveyor belt (2) is installed at the upper end of the device bottom plate (1); a water-spraying softening component (3) is installed above the conveyor belt (2) for softening soil and moistening the ground film, thereby facilitating subsequent cleaning work; a surface cleaning component (4) is installed behind the water-spraying softening component (3) for brushing away large impurities and soil on the surface; two groups of pressing and fixing components (5) for fixing the ground film are installed behind the conveyor belt (2); a vibration impurity blowing component (6) is installed between the two groups of pressing and fixing components (5) for loosening and dropping impurities on the ground film by vibration, and blowing away fine particles and light substances; and a winding component (7) is installed behind the vibration impurity blowing component (6).

2. The waste mulch film recycling and impurity removal mechanism according to claim 1 is characterized by: The water spray softening assembly (3) comprises a water tank (301), a support frame plate (302), a water pump (303), a water delivery pipe (304), a water branch pipe (305), a water spray transverse pipe (306) and a water spray head (307); the water tank (301) is installed on one side of the upper end of the device bottom plate (1); the water pump (303) is installed on the upper end of the water tank (301); the water delivery pipe (304) is fixedly connected to the upper end of the device bottom plate (1); the water branch pipe (305) is installed at the water delivery end of the water pump (303); the outer side of the water branch pipe (305) is connected to the water spray transverse pipe (306) through an electromagnetic valve; and the water spray head (307) is installed at the lower end of the water spray transverse pipe (306).

3. The waste mulch film recycling and impurity removal mechanism according to claim 1 is characterized by: The surface cleaning component (4) comprises a reinforcement support plate (401), a control guide frame plate (402), a first servo motor (403), an adjustment screw (404), a screw slider (405), a limit linkage block (406), an installation upper plate (407), a cleaning brush (408), an impurity outlet (409) and a first collection frame (410); a reinforcement support plate (401) is installed above the conveyor belt (2); a control guide frame plate (402) is installed at the upper end of the reinforcement support plate (401); and a first servo motor (403) is installed at the side end of the control guide frame plate (402). A servo motor (403); an adjusting screw (404) is arranged at the output end of the first servo motor (403); a screw slider (405) is drivingly connected to the outer side of the adjusting screw (404); a limit linkage block (406) is fixedly connected to the lower end of the screw slider (405); an upper mounting plate (407) is installed at the lower end of the limit linkage block (406); a cleaning brush (408) is installed at the lower end of the upper mounting plate (407); an impurity outlet (409) is opened at the side end of the conveyor belt (2); and a first collecting frame (410) is installed at the side end of the conveyor belt (2).

4. The waste mulch film recycling and impurity removal mechanism according to claim 1 is characterized by: The pressing and fixing assembly (5) comprises a support plate (501), a stabilizing support rod (502), a fixed upper plate (503), a hydraulic cylinder (504) and a protective pressure plate (505); the upper end of the device bottom plate (1) is fixedly connected to the support plate (501); both sides of the upper end of the support plate (501) are fixedly connected to the stabilizing support rod (502); the upper end of the stabilizing support rod (502) is mounted with the fixed upper plate (503); the upper end of the fixed upper plate (503) is mounted with the hydraulic cylinder (504); and the movable end of the hydraulic cylinder (504) is mounted with the protective pressure plate (505).

5. The waste mulch film recycling and impurity removal mechanism according to claim 1 is characterized by: The vibration impurity blowing component (6) comprises a fixed side plate (601), a vibration motor (602), a vibration connecting rod (603), a vibration filter screen (604), a vibration block (605), a limit baffle (606), a vibration spring (607), a second collection frame (608), a third collection frame (609), and an impurity removal fan (610); the upper end of the device bottom plate (1) is fixedly connected to the fixed side plate (601); the side end of the fixed side plate (601) is installed with a vibration motor (602); the output end of the vibration motor (602) is provided with a vibration connecting rod (603); the side end of the vibration connecting rod (603) is installed with a vibration filter screen (604); and both sides of the vibration filter screen (604) are fixedly connected with vibration blocks (605).

6. The waste mulch film recycling and impurity removal mechanism according to claim 5 is characterized by: Both ends of the inner side of the fixed side plate (601) are fixedly connected to the limit baffle (606); the upper and lower ends of the vibration block (605) are both installed with a vibration spring (607) whose other end is connected to the limit baffle (606); a second collection frame (608) is installed below the vibration filter plate (604); a third collection frame (609) is installed at the upper end of the fixed side plate (601); and a dust removal fan (610) is installed at the bottom end of the third collection frame (609).

7. The waste mulch film recycling and impurity removal mechanism according to claim 1 is characterized by: The winding assembly (7) comprises a mounting side plate (701), a second servo motor (702), a rotating rod (703) and a position-limiting winding roller (704); the mounting side plates (701) are fixedly connected to both sides of the upper end of the device bottom plate (1); the second servo motor (702) is installed at the side end of the mounting side plate (701); the output end of the second servo motor (702) is provided with a rotating rod (703); and the position-limiting winding roller (704) is installed on the outer side of the rotating rod (703).

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