Surface dirt cleaning method and equipment in PVC bag production process

Abstract

The invention discloses a surface dirt and impurity cleaning method and equipment in the PVC bag production process, and relates to the field of PVC bag processing.The equipment comprises a cleaning pool, an aeration pool, a first water removal tank and a second water removal tank are installed on one side of the cleaning pool, and a compressed gas generation mechanism is installed on the outer wall of the first water removal tank; the air outlet end of the compressed air generating mechanism is connected with an impeller. The cleaning tank and the aeration tank are arranged to conduct ultrasonic cleaning and aeration impurity removal on formed PVC sheets, the first water removal tank and the second water removal tank are arranged to conduct drying treatment on the cleaned sheets, and rotation of a rotating shaft in the first water removal tank is controlled by rotation of an impeller driven by compressed air; when the rotating shaft rotates, the cam enables the pressing plate to move up and down ceaselessly, the PVC sheets are kept vibrating up and down, water drops on the surfaces of the PVC sheets are shaken off, compressed air enters the aeration tank and the second water removal tank after driving the impeller to rotate, and aeration work and low-temperature drying work are conducted respectively.

Description

Technical Field

[0001] The present invention relates to the field of PVC bag processing, and specifically to a method and equipment for cleaning surface dirt during the production process of PVC bags. Background Art

[0002] With the improvement of people's environmental protection awareness, more and more products begin to use degradable materials. Among many plastic packaging products, PVC bags have received extensive attention due to their environmental protection, practicality and personalization characteristics. Among various PVC bags, PVC mesh bags are widely used in various fields, such as food packaging, household goods packaging, electronic component packaging, etc. It can protect items from extrusion, abrasion and pollution, and at the same time can be conveniently stacked and taken. Especially in the food industry, PVC mesh bags can effectively prevent food spoilage and ensure food safety.

[0003] When producing PVC mesh bags, first select PVC resin according to product performance, add auxiliaries such as plasticizers and stabilizers, and fully mix them in a high-speed mixer. Then preheat the mold to 160°C - 180°C, extrude the mixed raw materials through an extruder into a mesh sheet, and at the same time control parameters such as temperature, rotation speed, and pressure. Subsequently, it is cooled and shaped by circulating water at 20°C - 30°C and air cooling. Then accurately cut the sheet according to the predetermined size with a cutting device. After that, select sewing or heat-sealing process according to requirements to make the sheet into a bag. If printing is required, first design the pattern and text, and then select a suitable process such as screen printing for printing, and pay attention to the drying situation of the ink. After completion, conduct a comprehensive inspection on the appearance, size, physical properties and packaging labels of the mesh bag, and package the qualified products with plastic bags, etc., and store them in a dry and ventilated warehouse by classification.

[0004] Before printing, the surfaces of some PVC sheets are attached with dust and dirt. At this time, the sheets need to be cleaned to prevent the dust and dirt from affecting the subsequent printing quality. The common cleaning method is to pass the sheets through a cleaning liquid, soak them in the cleaning liquid and then rinse them, and perform a drying treatment after rinsing. Since the drying of PVC materials cannot use a relatively high temperature and needs to be air-dried naturally, the cleaning process is relatively long, which affects the processing efficiency of PVC mesh bags. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a method and equipment for cleaning surface dirt during the production process of PVC bags, so as to solve the technical problem of the relatively long cleaning process in the general production process of PVC bags.

[0006] To achieve the above object, the present invention provides the following technical solution: A surface dirt cleaning device in the production process of PVC bags, including a cleaning pool. On one side of the cleaning pool, an aeration pool, a first water removal tank, and a second water removal tank are installed in sequence. A compressed gas generating mechanism is installed on the outer wall of the first water removal tank. The air outlet end of the compressed gas generating mechanism is connected to an impeller. One end of the impeller is connected to a rotating shaft. A plurality of cams are arranged on the outer wall of the rotating shaft. A pressing plate is movably arranged inside the first water removal tank, and the pressing plate is located below the cams. An aeration mechanism is installed inside the aeration pool. One end of the aeration mechanism is connected to an air outlet end of the impeller. A low-temperature drying mechanism is installed inside the second water removal tank, and the low-temperature drying mechanism is connected to the other air outlet end of the impeller.

[0007] The present invention is further configured such that the compressed gas generating mechanism includes a filter box and a compressor. A filter box is arranged on the side wall of the first water removal tank. A compressor is installed on the top of the filter box. The air inlet end of the compressor is connected to the filter box, and the air outlet end of the compressor is connected to the air inlet end of the impeller.

[0008] The present invention is further configured such that the air outlet end of the impeller is connected to an air distribution channel, and an air distribution plate is fixedly arranged in the middle of the pipeline of the air distribution channel.

[0009] The present invention is further configured such that the aeration mechanism includes a bent pipe and an aeration head. The bent pipe is installed inside the aeration pool. A plurality of aeration heads are arranged on the outer wall of the bent pipe. The air inlet end of the bent pipe is connected to the air outlet end of the air distribution channel. A circulation pipe is vertically installed on the side wall of the aeration pool. A filter shell and a water pump are installed in sequence from top to bottom in the middle of the circulation pipe.

[0010] The present invention is further configured such that the low-temperature drying mechanism includes an air pipe and air outlet holes. The air pipe is installed inside the second water removal tank. Through holes are opened on the surface of the air pipe. A plurality of air outlet holes are opened at the bottom of the second water removal tank.

[0011] The present invention is further configured such that a water ring type vacuum pump is installed at the bottom of the second water removal tank, and the air extraction end of the water ring type vacuum pump faces the bottom of the second water removal tank.

[0012] The present invention is further configured such that a transducer is installed at the bottom of the cleaning pool, and the output part of the transducer is located inside the cleaning pool.

[0013] The present invention is further configured such that mounting frames are installed on one side of both the cleaning pool and the second water removal tank. One end of the mounting frame on the second water removal tank is installed with a motor. Guide rollers are arranged above and below the inner side walls of both the cleaning pool and the aeration pool. A group of limiting rollers are installed on both sides of the first water removal tank respectively.

[0014] The present invention is further configured such that a plurality of rotating shafts are installed inside the first water removal tank, and adjacent rotating shafts are connected by a chain drive mechanism. A plurality of rotating wheels are rotatably connected to the top of the pressing plate, and the rotating wheels correspond to the cams one by one. A rotating sleeve is rotatably provided on the outer wall of the rotating shaft, and a spring is connected between the outer wall of the rotating sleeve and the pressing plate.

[0015] A cleaning method for a surface dirt cleaning device in the production process of PVC bags:

[0016] Step 1: The PVC sheet to be cleaned enters the cleaning pool, and ultrasonic cleaning work is carried out by the cleaning pool.

[0017] Step 2: The PVC sheet that has undergone ultrasonic cleaning continues to enter the aeration tank, and the aeration tank disperses the dust particles that still adhere to the surface of the PVC sheet during the ultrasonic cleaning process but are already relatively loose.

[0018] Step 3: After cleaning, the PVC sheet has the surface moisture removed by the first water removal tank and the second water removal tank, so that the PVC sheet remains in a dry state.

[0019] In summary, the present invention mainly has the following beneficial effects: The present invention performs ultrasonic cleaning and aeration impurity removal on the formed PVC sheet by setting a cleaning pool and an aeration tank, and sets a first water removal tank and a second water removal tank to dry the cleaned sheet. The rotation of the rotating shaft inside the first water removal tank is controlled by the rotation of the impeller driven by compressed air. When the rotating shaft rotates, the cam makes the pressing plate continuously move up and down. The pressing plate contacts the PVC sheet, causing the PVC sheet to vibrate up and down, shaking off the water droplets on the surface. After driving the impeller to rotate, the compressed gas will respectively enter the aeration tank and the second water removal tank to perform aeration work and low-temperature drying work respectively, effectively realizing the cleaning and moisture removal process of the PVC sheet without heating up, and improving the cleaning completion efficiency of the PVC sheet. Description of the Drawings

[0020] Figure 1 It is a three-dimensional structure diagram of the first perspective of the present invention;

[0021] Figure 2 It is a three-dimensional structure diagram of the second perspective of the present invention;

[0022] Figure 3 It is a structure diagram of the elbow of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal structure of the first water removal tank of the present invention;

[0024] Figure 5 It is a schematic diagram of the internal structure of the impeller of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the second water removal tank of the present invention.

[0026] In the figure: 1. Cleaning pool; 2. Aeration tank; 3. First water removal tank; 4. Second water removal tank; 5. Guide roller; 6. Transducer; 7. Filter box; 8. Compressor; 9. Impeller; 10. Air distribution channel; 11. Rotating shaft; 12. Cam; 13. Pressing plate; 14. Rotating wheel; 15. Rotating sleeve; 16. Chain drive mechanism; 17. Elbow pipe; 18. Circulation pipe; 19. Aeration head; 20. Air pipe; 21. Air outlet hole; 22. Mounting frame; 23. Limiting roller; 24. Liquid-ring vacuum pump. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0028] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0029] A method and equipment for cleaning surface dirt during the production of PVC bags, as Figure 1-6 shown, including a cleaning pool 1. Mounting frames 22 are installed on one side of both the cleaning pool 1 and the second water removal tank 4. And a motor is installed at one end of the mounting frame 22 on the second water removal tank 4. A winding roller and an unwinding roller are respectively installed on the mounting frame 22. The unwinding roller is wound with an uncleaned PVC sheet, one end of which is connected to the winding roller. The motor controls the rotation of the winding roller to wind the PVC sheet onto the winding roller. A transducer 6 is installed at the bottom of the cleaning pool 1, and the output part of the transducer 6 is located inside the cleaning pool 1. An aeration tank 2, a first water removal tank 3, and a second water removal tank 4 are installed on one side of the cleaning pool 1 in sequence. During the winding process, the PVC sheet passes through the cleaning pool 1 in sequence. The transducer 6 cavitates the liquid inside the cleaning pool 1 to perform ultrasonic cleaning work on the PVC sheet. The aeration tank 2 breaks up the dust particles that are still attached to the surface of the PVC sheet during the ultrasonic cleaning process but are already relatively loose. The first water removal tank 3 and the second water removal tank 4 remove the moisture on the surface of the PVC sheet to keep the PVC sheet in a dry state.

[0030] A compressed gas generating mechanism is installed on the outer wall of the first water removal tank 3. The air outlet end of the compressed gas generating mechanism is connected to an impeller 9. The compressed gas generating mechanism includes a filter box 7 and a compressor 8. A filter box 7 is arranged on the side wall of the first water removal tank 3. A compressor 8 is installed on the top of the filter box 7. The air inlet end of the compressor 8 is connected to the filter box 7, and the air outlet end of the compressor 8 is connected to the air inlet end of the impeller 9. The compressed air generated by the compressor 8 after being filtered by the filter box 7 enters the impeller 9 from the air inlet end of the impeller 9 and pushes the impeller 9 to rotate;

[0031] One end of the impeller 9 is connected to a rotating shaft 11. A plurality of cams 12 are arranged on the outer wall of the rotating shaft 11. A pressing plate 13 is movably arranged on the inner wall of the first water removal tank 3, and the pressing plate 13 is located below the cams 12. When the impeller 9 rotates, the rotating shaft 11 rotates accordingly. At this time, the cams 12 will continuously squeeze the pressing plate 13, causing the pressing plate 13 to move up and down. Since the PVC sheet enters the first water removal tank 3 and is located below the pressing plate 13, when the pressing plate 13 moves up and down, it will continuously squeeze the PVC sheet, causing the PVC sheet to vibrate and shake off the large water droplets on the surface, realizing the preliminary water removal work of the PVC sheet;

[0032] In order to further improve the water discharge effect of the PVC sheet, a plurality of rotating shafts 11 are installed inside the first water removal tank 3. The adjacent rotating shafts 11 are connected by a chain drive mechanism 16. A plurality of rotating wheels 14 are rotatably connected to the top of the pressing plate 13, and the rotating wheels 14 correspond to the cams 12 one by one. A rotating sleeve 15 is rotatably arranged on the outer wall of the rotating shaft 11. The outer wall of the rotating sleeve 15 is connected to the pressing plate 13 by a spring. When one rotating shaft 11 rotates under the action of the impeller 9, the other rotating shafts 11 are synchronously rotated by the chain drive mechanism 16. And because the rotating wheels 14 are arranged on the top of the pressing plate 13, the cams 12 will squeeze the rotating wheels 14 to reduce the problems of large friction and impact force caused by the cams 12 directly squeezing the pressing plate 13. The rotating sleeve 15 can support the rotating shaft 11 on the top of the pressing plate 13 without affecting the rotation of the rotating shaft 11, and the spring can also improve the vibration effect of the pressing plate 13.

[0033] After the compressed air generated by the compressed gas generating mechanism drives the impeller 9 to rotate, it will enter the aeration mechanism installed inside the aeration tank 2 and the low-temperature drying mechanism installed inside the second water removal tank 4 respectively. The air outlet end of the impeller 9 is connected to a branch air duct 10. A dividing plate is fixedly arranged in the middle of the pipeline of the branch air duct 10. The branch air duct 10 is a tee, with one inlet and two outlets. The inlet is connected to the air outlet end of the impeller 9, and the outlets are respectively connected to the aeration mechanism and the low-temperature drying mechanism. The dividing plate is installed in the middle of the inlet end of the branch air duct 10. After the compressed gas enters the inlet end of the branch air duct 10, it will enter the two outlets respectively to realize the diversion work of the compressed gas.

[0034] The aeration mechanism includes an elbow pipe 17 and an aeration head 19. The elbow pipe 17 is installed inside the aeration tank 2. A plurality of aeration heads 19 are arranged on the outer wall of the elbow pipe 17. The air inlet end of the elbow pipe 17 is connected to the air outlet end of the branch air duct 10. A circulation pipe 18 is vertically installed on the side wall of the aeration tank 2. A filter housing and a water pump are successively installed from top to bottom in the middle of the circulation pipe 18. The compressed air entering the elbow pipe 17 of the aeration mechanism will be ejected from the aeration head 19 to aerate the liquid inside the aeration tank 2, and further clean the PVC sheet after ultrasonic cleaning. Moreover, the cleaning liquid inside the aeration tank 2 can be reused. The water pump will pump the liquid inside the aeration tank 2 into the circulation pipe 18, and after being filtered by the filter layer inside the filter housing, it is re-injected into the aeration tank 2, effectively improving the cleaning effect of the cleaning liquid;

[0035] The low-temperature drying mechanism includes an air pipe 20 and air outlet holes 21. The air pipe 20 is installed inside the second water removal tank 4. Through holes are formed on the surface of the air pipe 20. A plurality of air outlet holes 21 are formed at the bottom of the second water removal tank 4. The compressed air entering the air pipe 20 of the low-temperature drying mechanism will first be ejected from the through holes and then from the air outlet holes 21. Since the compressed air is a low-temperature gas and the PVC sheet is located below the second water removal tank 4, the PVC sheet can be dried at low temperature by the compressed air, further improving the water removal effect. A water ring vacuum pump 24 is installed at the bottom of the second water removal tank 4, and the air extraction end of the water ring vacuum pump 24 faces the bottom of the second water removal tank 4. The water ring vacuum pump 24 can suck away the compressed air with moisture for collection. The compressed air blows and the water ring vacuum pump 24 sucks, which can achieve a better drying and dehumidification effect.

[0036] Compressed air plays multiple roles in this case. First, it drives the impeller 9 to rotate, and then it is used for aeration and low-temperature dehumidification respectively. Compared with traditional natural air drying and direct blowing, the effect is better and the utilization rate of compressed air is higher.

[0037] Guide rollers 5 are provided above and below the inner side walls of the cleaning tank 1 and the aeration tank 2. A set of limit rollers 23 are respectively installed on both sides of the first water removal tank 3. The guide rollers 5 guide the path of the PVC sheet, enabling it to be fully immersed in the cleaning tank 1 and the aeration tank 2. The depth of the cleaning liquid in the cleaning tank 1 and the aeration tank 2 is greater than the height of the lower guide roller 5. Each set of limit rollers 23 consists of two upper and lower rollers. The PVC sheet is located between the limit rollers 23, and the extrusion restriction on the PVC sheet between the limit rollers 23 is controlled by a limit spring.

[0038] An overflow tank can also be installed between the aeration tank 2 and the first water removal tank 3 to prevent dust from adhering to the surface of the PVC sheet again.

[0039] Although embodiments of the present invention have been shown and described, the specific embodiments are merely explanations of the present invention and are not limitations thereof. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A surface dirt cleaning device in a PVC bag production process, comprising a cleaning tank (1), characterized in that: An aeration tank (2), a first water removal tank (3) and a second water removal tank (4) are installed on one side of the cleaning tank (1); a compressed gas generating mechanism is installed on the outer wall of the first water removal tank (3); an air outlet end of the compressed gas generating mechanism is connected to an impeller (9); one end of the impeller (9) is connected to a rotating shaft (11); a plurality of cams (12) are arranged on the outer wall of the rotating shaft (11); a pressure plate (13) is movably arranged on the inner wall of the first water removal tank (3); and the pressure plate (13) is located below the cam (12); an aeration mechanism is installed inside the aeration tank (2); one end of the aeration mechanism is connected to one air outlet end of the impeller (9); a low-temperature drying mechanism is installed inside the second water removal tank (4); and the low-temperature drying mechanism is connected to the other air outlet end of the impeller (9).

2. The surface dirt cleaning device in the PVC bag production process according to claim 1 is characterized by: The compressed gas generating mechanism comprises a filter box (7) and a compressor (8); the side wall of the first dewatering box (3) is provided with a filter box (7); the top of the filter box (7) is installed with a compressor (8); the air inlet end of the compressor (8) is connected to the filter box (7); and the air outlet end of the compressor (8) is connected to the air inlet end of the impeller (9).

3. The surface dirt cleaning device in the PVC bag production process according to claim 1 is characterized by: The air outlet end of the impeller (9) is connected to an air distribution channel (10), and an air distribution plate is fixedly arranged in the middle of the pipeline of the air distribution channel (10).

4. The surface dirt cleaning device in the PVC bag production process according to claim 3 is characterized by: The aeration mechanism comprises a curved pipe (17) and an aeration head (19); the curved pipe (17) is installed inside the aeration tank (2); a plurality of aeration heads (19) are arranged on the outer wall of the curved pipe (17); an air inlet end of the curved pipe (17) is connected to an air outlet end of the air distribution channel (10); a circulation pipe (18) is vertically installed on the side wall of the aeration tank (2); a filter housing and a water pump are sequentially installed in the middle of the circulation pipe (18) from top to bottom.

5. The surface dirt cleaning device in the PVC bag production process according to claim 1 is characterized by: The low-temperature drying mechanism comprises an air pipe (20) and air outlet holes (21); the air pipe (20) is installed inside the second dewatering box (4); a through hole is provided on the surface of the air pipe (20); and a plurality of air outlet holes (21) are provided on the bottom of the second dewatering box (4).

6. The surface dirt cleaning device in the PVC bag production process according to claim 5, characterized in that: A water ring vacuum pump (24) is installed at the bottom of the second dewatering tank (4), and the suction end of the water ring vacuum pump (24) faces the bottom of the second dewatering tank (4).

7. The surface dirt cleaning device in the PVC bag production process according to claim 1 is characterized by: A transducer (6) is installed at the bottom of the cleaning tank (1), and an output portion of the transducer (6) is located inside the cleaning tank (1).

8. The surface dirt cleaning device in the PVC bag production process according to claim 1 is characterized by: A mounting frame (22) is installed on one side of the cleaning tank (1) and the second water removal tank (4), and a motor is installed on one end of the mounting frame (22) on the second water removal tank (4). Guide rollers (5) are arranged above and below the inner side walls of the cleaning tank (1) and the aeration tank (2), and a group of limiting rollers (23) are respectively installed on both sides of the first water removal tank (3).

9. The surface dirt cleaning device in the PVC bag production process according to claim 1, characterized in that: A plurality of rotating shafts (11) are installed inside the first dewatering box (3), and adjacent rotating shafts (11) are connected via a chain transmission mechanism (16). The top of the pressure plate (13) is rotatably connected to a plurality of rotating wheels (14), and the rotating wheels (14) correspond to the cams (12) one by one. A rotating sleeve (15) is rotatably provided on the outer wall of the rotating shaft (11), and the outer wall of the rotating sleeve (15) is connected to the pressure plate (13) via a spring.

10. A method for cleaning surface dirt cleaning equipment in a PVC bag production process according to claims 1-9, characterized in that: include: Step 1: The PVC sheet to be cleaned enters the cleaning tank (1), and the cleaning tank (1) performs ultrasonic cleaning; Step 2: The PVC sheet that has been ultrasonically cleaned continues to enter the aeration tank (2), and the aeration tank (2) breaks up the loose dust particles that are still attached to the surface of the PVC sheet during the ultrasonic cleaning process; Step 3: After being cleaned, the first water removal tank (3) and the second water removal tank (4) remove the moisture on the surface of the PVC sheet, so that the PVC sheet remains dry.

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