Agricultural film constant-tension production equipment

Abstract

The utility model discloses agricultural film constant-tension production equipment. The agricultural film constant-tension production equipment comprises an extruder, a blow molding device, a fan, a guide bracket, a guide roller, a traction device, a winding device and a control system, the output end of the extruder is connected with a feeding hole of the blow molding device; an air outlet of the fan is formed in an output port of the blow molding device; the guide bracket is arranged above the blow molding device; the guide roller is arranged above the guide bracket; the traction device is positioned on one side of the blow molding device; a film moves upwards from an output port of the blow molding device to pass through the guide bracket, and then moves downwards to the traction device under the guide of the guide roller; the winding device is arranged behind the traction device; the control system respectively controls the extruder, the fan, the traction device and the winding device; a tension detection device is arranged between the guide roller and the traction device; the tension detection device is used for detecting the tension of the film. According to the utility model, the film can be conveyed at constant tension, the blow molding quality and the winding effect of the film are improved, and the quality of the film is ensured.

Description

Technical Field

[0001] The utility model relates to film production equipment, in particular to agricultural film constant tension production equipment. Background Art

[0002] Existing agricultural film production equipment generally uses a blowing device to blow out a circular film, then uses a guide device to fold the circular film into a film, and finally reels it through a traction device and a reeling device. However, during the blowing and conveying process of the film, the conveying tension of the film will change due to changes in the conveying speed of the extruder or changes in the ambient temperature that slow down the solidification speed of the film and cause it to be stretched. Unstable conveying tension will affect the blowing quality and reeling effect of the film, and affect the production quality of the film. Utility Model Content

[0003] The utility model aims to provide agricultural film constant tension production equipment which can transport the film with constant tension, improve the film blowing quality and winding effect, and ensure the quality of the film.

[0004] In order to achieve the above-mentioned purpose, the agricultural film constant tension production equipment provided by the utility model includes an extruder, a blow molding device, a fan, a guide bracket, a guide roller, a traction device, a winding device and a control system; the output end of the extruder is connected to the feed port of the blow molding device; the air outlet of the fan is arranged at the output port of the blow molding device to blow air to and cool the extruded film; the guide bracket is arranged above the blow molding device and has a herringbone structure to extrude the film into a double-layer structure; the guide roller is arranged above the guide bracket; the traction device is located on one side of the blow molding device to provide a traction force to move the film; the film moves upward from the output port of the blow molding device through the guide bracket, and then moves downward to the traction device under the guidance of the guide roller; the winding device is arranged behind the traction device , so as to automatically reel up the film; the control system controls the extruder, the fan, the traction device and the reeling device respectively; a tension detection device is provided between the guide roller and the traction device, and the tension detection device is electrically connected to the control system; the tension detection device is used to detect the tension of the film; the tension detection device comprises a frame, a displacement sensor, a floating roller and a plurality of transition rollers, the frame is provided with a vertically extending sliding groove, and the two ends of the floating roller can be slidably arranged in the sliding groove; hangers are provided at both ends of the floating roller, and a plurality of counterweights are placed on the hangers; the transition rollers are respectively arranged at the front and rear sides of the floating roller, and the film is wound around the transition roller and the floating roller, and the displacement sensor is arranged on the frame and can detect the position of the floating roller; the displacement sensor is electrically connected to the control system.

[0005] Compared with the prior art, the utility model arranges a floating roller on the frame. When the tension changes, the floating roller will float up and down. At the same time, a displacement sensor is arranged to detect the position of the floating roller, so that the tension change of the film can be detected quickly and timely, which is conducive to timely and accurately controlling the feeding speed of the extruder and the traction speed of the traction device through the control system, thereby controlling the conveying tension of the film and ensuring the constancy of the conveying tension. Therefore, by detecting the tension of the film through the tension detection device, it is possible to ensure that the blowing quality and winding effect of the film are improved, and the quality of the film is guaranteed.

[0006] Specifically, the agricultural film constant tension production equipment also includes a cooling device, which is electrically connected to the control system, and the cooling air outlet of the cooling device is arranged between the blowing device and the guide roller and between the guide roller and the traction device to cool the film. Since the fan is limited by its own power, the cooling effect is effective, and is affected by the ambient temperature, the cooling speed of the film may change after it is blown out. When the ambient temperature is high, the cooling speed may slow down. The film may be stretched and thinned during transportation, so the tension may change to a certain extent. By setting the cooling device, the cooling speed / effect of the cooling device on the film can be controlled according to the tension change of the film detected by the tension detection device, and the tension of the film can be effectively controlled, thereby ensuring the blowing quality of the film.

[0007] Specifically, the tension detection device further includes a buffer member, which is disposed at the lower end of the sliding groove to buffer the floating roller when the floating roller falls.

[0008] Specifically, the buffer member is a compression spring.

[0009] Specifically, the agricultural film constant tension production equipment also includes an anti-wrinkle device, which is arranged before the winding device to flatten the edge of the film. Since the double-layer film has a certain conveying distance before winding, during this process, the two layers of film may be wrinkled by wind or other reasons. Therefore, by setting the anti-wrinkle device, the film will not be wrinkled before winding, the winding effect is improved, and the aesthetics of the film after winding and the aesthetics of the film when in use are ensured.

[0010] Specifically, the anti-wrinkle device includes a laser detector and a pair of blowing mechanisms, the laser detector and the blowing mechanism are respectively electrically connected to the control system to detect whether the edge of the film is wrinkled; the two blowing mechanisms are arranged between the laser detector and the winding device, and the two blowing mechanisms are respectively arranged on both sides of the surface and bottom surface of the film, and the blowing nozzles of the blowing mechanisms are inclined toward the outer edge of the film to blow the wrinkles on the edge of the film flat. By first detecting the film with a laser detector, and then blowing air on the upper and lower sides of the edge of the film with a blowing mechanism, the edge of the film is blown flat before winding, so that the film can be prevented from being wound in a wrinkled state, and the winding effect is effectively guaranteed.

[0011] Specifically, the anti-wrinkle device also includes a brush shaft and a motor. The brush shaft is arranged between the blowing mechanism and the winding device. The output end of the motor is connected to the brush shaft to drive the brush shaft to rotate. The surfaces at both ends of the brush shaft are provided with multiple rows of bristles in a spiral shape around the central axis, and the spiral directions of the bristles at both ends of the brush shaft are opposite. The rotation direction of the upper side of the brush shaft is opposite to the conveying direction of the film, so as to smooth the wrinkles of the film on each side toward the edge of the film. For some films, there are static electricity and other effects, and the wrinkles are large and not easy to be blown flat. Therefore, by setting the brush shaft and utilizing the friction resistance generated between the brush shaft and the film, the film can be smoothed by the bristles, thereby further improving the anti-wrinkle effect of the film and ensuring the film winding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a side structural schematic diagram of the utility model agricultural film constant tension production equipment.

[0013] Figure 2 The utility model is a side structural diagram of a tension detection device of agricultural film constant tension production equipment.

[0014] Figure 3 It is a main structural diagram of a tension detection device of agricultural film constant tension production equipment of the utility model.

[0015] Figure 4 The utility model is a structural diagram of an anti-wrinkle device of agricultural film constant tension production equipment.

[0016] Figure 5 The utility model is a structural diagram of a brush shaft of an anti-wrinkle device of agricultural film constant tension production equipment. DETAILED DESCRIPTION

[0017] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0018] like Figure 1 As shown, the agricultural film constant tension production equipment 100 of the utility model includes an extruder 1, a blow molding device 2, a fan 3, a guide bracket 4, a guide roller 5, a traction device 6, a winding device 7 and a control system; the output end of the extruder 1 is connected to the feed port of the blow molding device 2; the air outlet of the fan 3 is arranged at the output port of the blow molding device 2 to blow air and cool the extruded film 200; the guide bracket 4 is arranged above the blow molding device 2 and has a herringbone structure to extrude the film 200 into a double-layer structure; the guide roller 5 is arranged above the guide bracket 4; the traction device 6 is located on one side of the blow molding device 2 to provide a traction force to move the film 200; the film 200 moves upward from the output port of the blow molding device 2 through the guide bracket 4, and then moves downward to the traction device 6 under the guidance of the guide roller 5; the winding device 7 is arranged behind the traction device 6 to automatically wind up the film 200. The control system controls the extruder 1, the fan 3, the traction device 6 and the winding device 7 respectively.

[0019] Please refer to the figure Figure 1 and Figure 2A tension detection device 8 is provided between the guide roller 5 and the traction device 6, and the tension detection device 8 is electrically connected to the control system; the tension detection device 8 is used to detect the tension of the film, so that the extrusion speed of the extruder 1 can be controlled through the control system. By using the tension detection device 8 to detect the tension of the film, the thickness of the film can be guaranteed to be uniform, thereby improving the quality of film blowing. Specifically, the agricultural film constant tension production equipment 100 also includes a cooling device 9, which is electrically connected to the control system, and the cooling air outlet of the cooling device 9 is arranged between the blowing device 2 and the guide roller 5 and between the guide roller 5 and the traction device 6 to cool the film. Since the fan 3 is limited by its own power, the cooling effect is effective, and is affected by the ambient temperature, the cooling speed of the film may change after it is blown out. When the ambient temperature is high, the cooling speed may slow down. The film may be stretched and thinned during transportation, so the tension may change to a certain extent. By setting the cooling device 9, the cooling speed / effect of the cooling device 9 on the film can be controlled according to the tension change of the film detected by the tension detection device 8, and the tension of the film can be effectively controlled, thereby ensuring the blow molding quality of the film. The cooling device 9 in this embodiment has a plurality of cooling nozzles 91, which are all connected to the refrigeration device. By using the refrigeration device to control the temperature of the cold air blown out, different cooling speeds can be achieved for the film. When the tension of the film is in the normal range, the cooling device 9 stops working to reduce energy consumption. When the tension of the film becomes smaller, the control system can control the refrigeration device, and adjust the temperature of the air blown out by the refrigeration device according to the size of the tension, so as to ensure the cooling effect and ensure that the tension tends to be normal.

[0020] Please see again Figure 2 and Figure 3The tension detection device 8 includes a frame 81, a displacement sensor 82, a floating roller 83 and a plurality of transition rollers 84. The frame 81 is provided with a vertically extending sliding groove 811, and the two ends of the floating roller 83 are slidably arranged in the sliding groove 811; the two ends of the floating roller 83 are provided with hangers 85, and a plurality of counterweights 851 are placed on the hangers 85; the transition roller 84 is respectively arranged at the front and rear sides of the floating roller 83, and the film is wound around the transition roller 84 and the floating roller 83. The displacement sensor 82 is arranged on the frame 81 and can detect the position of the floating roller 83; the displacement sensor 82 is electrically connected to the control system. The tension detection device 8 also includes a buffer 86, which is arranged at the lower end of the sliding groove 811 to buffer the floating roller 83 when it falls. The buffer 86 is a compression spring, which is respectively arranged at the lower ends of the two sliding grooves 811. Of course, the buffer 86 can also be elastic rubber. By arranging the floating roller 83 on the frame 81, when the tension changes, the floating roller 83 will float up and down, and by arranging the displacement sensor 82, the position of the floating roller 83 is detected, so that the tension change of the film can be detected quickly and timely, which is conducive to the control system to timely and accurately control the cooling effect of the cooling device 9 on the film. In this embodiment, the displacement sensor 82 can be a Hall sensor 821. The Hall sensor 821 is arranged at the position of the frame 81 corresponding to the floating roller 83, and the end surface of the floating roller 83 is provided with a magnet 822, and the magnet 822 is directly opposite to the Hall sensor 821. When the floating roller 83 moves, the Hall sensor 821 detects the position of the magnet 822 by magnetic field induction, thereby sending a signal to the control system, and the control system then sends the corresponding control signal to the cooling device 9. Of course, the displacement sensor 82 can also be a grating sensor.

[0021] Please refer to the figure Figure 1 , Figure 4 and Figure 5The agricultural film constant tension production equipment 100 further includes an anti-wrinkle device 110, which is arranged before the winding device 7 to flatten the edge of the film. Since the film has a certain conveying distance from being blown out to being wound up, the film may be wrinkled by wind or other reasons during this process. Therefore, by arranging the anti-wrinkle device 110, the film will not be wrinkled before being wound up, thereby improving the winding effect and ensuring the beauty of the film after being wound up and the beauty of the film when in use. Specifically, the anti-wrinkle device 110 includes a laser detector 111 and a pair of air blowing mechanisms 112, the laser detector 111 and the air blowing mechanisms 112 are respectively electrically connected to the control system to detect whether the edge of the film is wrinkled; the two air blowing mechanisms 112 are arranged between the laser detector 111 and the winding device 7, the air blowing mechanism 112 includes an air blowing nozzle 1121 and an air pressure generating device (not shown in the figure), the air blowing nozzle 1121 is connected to the air pressure generating device, the two air blowing nozzles 1121 are respectively arranged on both sides of the surface and bottom surface of the film, and the air blowing nozzles are inclined toward the outer edge of the film to flatten the wrinkles on the edge of the film. By first detecting the film with the laser detector 111, and then blowing air with the air blowing mechanism 112 on the upper and lower sides of the edge of the film, the edge of the film is flattened and then rolled up, so that the film can be prevented from being rolled up in a wrinkled state, and the rolling effect is effectively guaranteed.

[0022] Please see again Figure 1 and Figure 5 The anti-wrinkle device 110 also includes a brush shaft 113 and a motor 114. The brush shaft 113 is arranged between the blowing mechanism 112 and the winding device 7. The output end of the motor 114 is connected to the brush shaft 113 to drive the brush shaft 113 to rotate. The surfaces of both ends of the brush shaft 113 are spirally provided with multiple rows of bristles 1131 around the central axis, and the spiral directions of the bristles 1131 at both ends of the brush shaft 113 are opposite. The rotation direction of the upper side of the brush shaft 113 is opposite to the conveying direction of the film, so as to smooth the wrinkles of the film on each side toward the edge of the film. For some films, there are static electricity and other effects, and the wrinkles are large and the wrinkles are not easy to be blown flat. Therefore, by setting the brush shaft 113, the friction resistance generated between the brush shaft 113 and the film is used to make the film smooth by the bristles 1131, thereby further improving the anti-wrinkle effect of the film and ensuring the film winding effect.

[0023] Combining the above and Figure 1 The working principle of the utility model agricultural film constant tension production equipment 100 is described in detail as follows:

[0024] During blow molding, the extruder 1 is started to heat and melt the granular material (PE polyethylene granules) and convey it to the blow molding device 2 through the screw. The blow molding device 2 blows the material into a film 200, and the film 200 is output from the blow molding device 2 and enters the guide bracket 4 upward under the traction of the traction device 6. In this process, the fan 3 blows air to cool the film 200 and separates the film 200 to prevent them from sticking to each other. The film 200 is folded into a double-layer film 200 under the guidance of the guide bracket 4 and conveyed downward after being guided by the guide roller 5. The film 200 then passes through the tension detection device 8 and the anti-wrinkle device 110 and enters the winding device 7 for winding. During the whole process, the film 200 is within the set tension range. When the tension of the film 200 changes, for example, the tension decreases, the floating roller 83 drops, and the Hall sensor 821 detects the position of the floating roller 83, and then sends a signal to the control system, and the control system controls the cooling device 9 to start, and the cooling device 9 quickly cools the film 200, or the control system controls the extruder 1 to slow down the extruded material feeding speed, so as to adjust the tension. During the conveying process of the film 200, the laser detector 111 detects the edge of the film. If wrinkles are detected on the edge of the film 200, the control system controls the blowing mechanism 112 to start, and the blowing mechanisms 112 on the upper and lower sides simultaneously blow air from the inside to the edge of the film 200, so that the wrinkles are blown flat. In addition, after passing through the blowing mechanism 112, the film 200 also passes through the brush shaft 113, and the bristles 1131 on the brush shaft 113 sweep the wrinkles, so that the wrinkles are swept flat, and finally the film 200 enters the winding device 7 and is wound by the winding device 7.

[0025] Compared with the prior art, the utility model sets a floating roller 83 on the frame 81. When the tension changes, the floating roller 83 will float up and down. At the same time, a displacement sensor 82 is set to detect the position of the floating roller 83, so that the tension change of the film can be detected quickly and timely, which is conducive to timely and accurately controlling the feeding speed of the extruder 1 and the traction speed of the traction device 2 through the control system, and then controlling the conveying tension of the film to ensure the constancy of the conveying tension. Therefore, by detecting the tension of the film through the tension detection device 8, it is possible to ensure that the blowing quality and winding effect of the film are improved, and the quality of the film is guaranteed.

[0026] The structures of the extruder 1 and the winding device 7 involved in the constant tension production equipment 100 for agricultural films of the present invention are well known to ordinary technicians in the field and will not be described in detail here.

[0027] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A constant tension production equipment for agricultural films, characterized by: The invention comprises an extruder, a blow molding device, a blower, a guide bracket, a guide roller, a traction device, a winding device and a control system; the output end of the extruder is connected to the feed port of the blow molding device; the air outlet of the blower is arranged at the output port of the blow molding device to blow air to and cool the extruded film; the guide bracket is arranged above the blow molding device and is in a herringbone structure to extrude the film into a double-layer structure; the guide roller is arranged above the guide bracket; the traction device is located on one side of the blow molding device to provide a traction force to move the film; the film moves upward from the output port of the blow molding device through the guide bracket, and then moves downward to the traction device under the guidance of the guide roller; the winding device is arranged behind the traction device to automatically wind up the film; the control The system controls the extruder, fan, traction device and winding device respectively; a tension detection device is provided between the guide roller and the traction device, and the tension detection device is electrically connected to the control system; the tension detection device is used to detect the tension of the film; the tension detection device comprises a frame, a displacement sensor, a floating roller and a plurality of transition rollers, the frame is provided with a vertically extending sliding groove, and the two ends of the floating roller can be slidably arranged in the sliding groove; hangers are provided at both ends of the floating roller, and a plurality of counterweights are placed on the hangers; the transition rollers are respectively arranged on the front and rear sides of the floating roller, and the film is wound around the transition roller and the floating roller, and the displacement sensor is arranged on the frame and can detect the position of the floating roller; the displacement sensor is electrically connected to the control system.

2. The agricultural film constant tension production equipment according to claim 1, characterized in that: The agricultural film constant tension production equipment also includes a cooling device, which is electrically connected to the control system. The cooling air outlet of the cooling device is arranged between the blowing device and the guide roller and between the guide roller and the traction device to cool the film.

3. The agricultural film constant tension production equipment according to claim 1, characterized in that: The tension detection device further comprises a buffer member, which is arranged at the lower end of the sliding groove to buffer the floating roller when the floating roller falls.

4. The agricultural film constant tension production equipment according to claim 3, characterized in that: The buffer member is a compression spring.

5. The agricultural film constant tension production equipment according to claim 1, characterized in that: The agricultural film constant tension production equipment also includes an anti-wrinkle device, which is arranged before the winding device to flatten the edge of the film.

6. The agricultural film constant tension production equipment according to claim 5, characterized in that: The anti-wrinkle device includes a laser detector and a pair of blowing mechanisms, and the laser detector and the blowing mechanism are respectively electrically connected to the control system to detect whether wrinkles occur at the edge of the film; the two blowing mechanisms are arranged between the laser detector and the winding device, and the two blowing mechanisms are respectively arranged on both sides of the surface and bottom surface of the film, and the blowing nozzles of the blowing mechanisms are inclined toward the outer edge of the film to flatten the wrinkles on the edge of the film.

7. The agricultural film constant tension production equipment according to claim 6, characterized in that: The anti-wrinkle device also includes a brush shaft and a motor. The brush shaft is arranged between the blowing mechanism and the winding device. The output end of the motor is connected to the brush shaft to drive the brush shaft to rotate. The surfaces at both ends of the brush shaft are spirally provided with multiple rows of bristles around the central axis, and the spiral directions of the bristles at both ends of the brush shaft are opposite. The rotation direction of the upper side of the brush shaft is opposite to the conveying direction of the film, so as to smooth the wrinkles of the film on each side toward the edge of the film.

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