A processing device based on polyvinyl chloride nonwoven fabric

Abstract

This invention discloses a processing device based on polyvinyl chloride (PVC) nonwoven fabric, relating to the field of processing equipment for PVC nonwoven fabric. The PVC nonwoven fabric processing device includes a feeding unit, a positioning unit, a folding and shaping unit, and a heat-melting unit. By setting the positioning unit and the folding and shaping unit between the feeding unit and the heat-melting unit, the flat fabric, after passing through the feeding unit, is folded upwards on both sides by the positioning unit to form a U-shaped structure. Then, the folding and shaping unit folds the two vertical sides towards the center to overlap, and heat-presses the two sides to form a flat tube shape. The tube then enters the heat-melting unit for heat-melting and bonding of the two seams. Pre-shaping before heat-melting ensures the flatness of the seams and facilitates winding, storage, and transportation after heat-melting.

Description

Technical Field

[0001] This invention relates to the technical field of processing equipment based on polyvinyl chloride nonwoven fabric, specifically to a processing equipment based on polyvinyl chloride nonwoven fabric. Background Technology

[0002] Polyvinyl chloride nonwoven fabric, also known as PVC nonwoven fabric, is made by mixing polyvinyl chloride as the main raw material with plasticizers, stabilizers, fillers, etc. in a certain proportion. The mixture is then blended in a high-speed mixer to form a premix. The premix is ​​then fed into an extruder and heated to 160-200℃ to melt the PVC. Uniform fibers are then extruded through the extruder and woven to form nonwoven fabric. There are many types of nonwoven fabric, with polyvinyl chloride nonwoven fabric being the most widely used. The fabric is then cut to the required size to form long strips, and the two sides of the fabric are wrapped around to form a tube and then seamed to form the corresponding filter consumables.

[0003] There are two traditional methods for fixing seams. One method is to use sewing thread for fixing. The advantage is high strength, but the disadvantage is that there are needle holes, which can easily lead to leakage during use. The other method is to use hot melt bonding. Two seams are overlapped and then hot-pressed and melted by processing equipment based on polyvinyl chloride nonwoven fabric, so that the two are bonded together, thereby achieving fixation.

[0004] However, in the current industry practice, when using processing equipment based on PVC nonwoven fabric for hot-melt bonding, the PVC nonwoven fabric is wound into a tubular shape using a positioning mold, and then the two seams are bonded together. After the seams are completed, the cylindrical tube is pressed at the edges for easy storage and transportation. However, in actual processing, because the PVC nonwoven fabric is wound into a tubular shape for seams, there are no auxiliary linings on either the inner or outer sides of the PVC nonwoven fabric. If the overall tube diameter is large, the upper part of the tube is prone to collapse downwards, resulting in inaccurate seams. This means that the number of non-overlapping parts between the two seams during hot pressing remains constant, leading to different seam widths. The resulting dust bag is skewed, and the skewed seams are also prone to folding, resulting in incomplete hot pressing and leakage problems during subsequent use. Therefore, a processing equipment based on PVC nonwoven fabric is provided to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a processing device based on polyvinyl chloride (PVC) nonwoven fabric. This device solves the problem that when using existing PVC nonwoven fabric for hot-melt bonding in the production of dust collector bags, if the overall tube diameter is large, the upper part of the tube tends to collapse downwards, leading to inaccurate seams. This results in a constant number of non-overlapping seams during the hot-pressing process, causing seam width differences and resulting in skewed dust collector bags. Furthermore, skewed seams are prone to folding, leading to incomplete hot pressing and leakage during subsequent use.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a processing equipment based on polyvinyl chloride nonwoven fabric, comprising a feeding unit, a positioning unit, a folding and shaping unit, and a hot-melting unit;

[0007] Preferably, the feeding unit includes a feeding frame, a material support roller, a lifting roller, and a positioning pressure roller. The material support roller is installed in the feeding frame; the lifting roller is rotatably disposed at the top inside the feeding frame; and the positioning pressure roller is rotatably disposed at the front side of the feeding frame.

[0008] Preferably, the positioning unit includes a positioning support frame, an opening gradient frame, a feeding guide plate, a U-shaped positioning frame, a positioning mechanism, and a positioning clamp. The U-shaped positioning frame is provided with a positioning mechanism inside, which squeezes and adheres the polyvinyl chloride nonwoven fabric to the inner wall of the U-shaped positioning frame, causing the two sides of the polyvinyl chloride nonwoven fabric to fold upward.

[0009] A positioning support frame is fixedly installed on the front side of the positioning pressure roller; the U-shaped positioning frame is fixedly installed on the top of the positioning support frame; the opening gradient frame is fixedly installed at one end of the U-shaped positioning frame to guide the polyvinyl chloride nonwoven fabric from the positioning pressure roller to the U-shaped positioning frame; the feeding guide plate is integrally formed on the inner side of the opening gradient frame near the U-shaped positioning frame, and a feeding gap is formed between the feeding guide plate and the opening gradient frame; the positioning clamp is installed on both sides of the U-shaped positioning frame to keep the two seam edges of the polyvinyl chloride nonwoven fabric in contact with the side wall of the U-shaped positioning frame.

[0010] Preferably, the positioning mechanism includes an N-shaped frame, a guide rail, a lifting cylinder, a suspension arm, a flattening roller, a positioning support rod, and a positioning pressure roller. The N-shaped frame is horizontally positioned across the top of the end of the U-shaped positioning frame; the guide rail is fixedly positioned on both sides of the outer wall of the U-shaped positioning frame; the lifting cylinder is fixedly positioned on both sides of the outer wall of the U-shaped positioning frame; and the lifting cylinder pushes the N-shaped frame to slide up and down along the guide rail; the suspension arm is fixedly positioned at the bottom of the N-shaped frame; the flattening roller is rotatably positioned at the bottom of the suspension arm; the positioning support rod is movably hinged to both sides of the suspension arm; the positioning pressure roller is rotatably positioned at the bottom end of the positioning support rod, and the positioning pressure roller rolls the polyvinyl chloride nonwoven fabric into the folded corners on both sides of the bottom of the N-shaped frame.

[0011] More specifically, the end of the opening gradient frame near the positioning pressure roller is open, and the end of the opening gradient frame near the U-shaped positioning frame is narrowed; the outer side of the positioning clamp is fixedly installed to the outer wall of the U-shaped positioning frame, and the inner side of the positioning clamp is shaped like a "6" and forms a material feeding gap with the U-shaped positioning frame.

[0012] Preferably, the folding and shaping unit includes a folding support frame, a shaping carrier plate, a folding cover plate, electric heating rollers, and shaping auxiliary components. The folding cover plate is rotatably disposed on both sides of the shaping carrier plate. Electric heating rollers are provided in the middle of both sides of the shaping carrier plate. After the polyvinyl chloride nonwoven fabric is folded and positioned by the folding cover plate, it is hot-pressed and formed by the electric heating rollers. The shaping carrier plate is fixedly disposed on the top of the folding support frame. The shaping auxiliary components are disposed at one end of the folding support frame and extend into the shaping carrier plate for folding and positioning of the polyvinyl chloride nonwoven fabric.

[0013] Preferably, the shaping auxiliary component includes two sets of support blocks, sliding columns, a rotating shaft, a positioning block, a positioning pressure plate, and two sets of positioning grooves.

[0014] Two sets of support blocks are fixedly installed on the top of both sides of the folding support frame; sliding columns are movably inserted into the support blocks; a rotating shaft is rotatably installed between the two sets of sliding columns; a positioning block is fixedly installed in the middle of the rotating shaft; a positioning pressure plate is fixedly installed at the bottom of the positioning block, and the positioning pressure plate is movably inserted into the shaping carrier plate; two sets of positioning grooves are respectively opened through the outer walls of the positioning block on both sides, and the opposite sides of the two sets of positioning grooves are overlapped, which is used for the overlapping positioning of the two seam edges of the polyvinyl chloride nonwoven fabric.

[0015] Preferably, the hot-melt unit includes a hot-melt bracket, a roller clamping component, a gate-shaped bracket, a hot-melt adhesive component, two sets of feeding rollers and a cooling fan. A hot-melt adhesive component is provided between the two sets of symmetrically arranged roller clamping components. The two sets of roller clamping components clamp and push the folded polyvinyl chloride nonwoven fabric from both sides toward the center, so that the two seam edges of the polyvinyl chloride nonwoven fabric overlap and the seam is hot-melted and bonded by the hot-melt adhesive component to form a seamless dust filter bag.

[0016] Preferably, the two sets of roller clamping components are arranged on both sides of the hot melt support; the portal frame is fixedly arranged on the top of the hot melt support, and the hot melt adhesive is suspended and fixed at the bottom of the portal frame; the two sets of feeding rollers are rotatably arranged at the end of the hot melt support, and the two types of feeding rollers are staggered vertically; the cooling fan is fixedly arranged on the hot melt support and located between the two sets of feeding rollers.

[0017] Preferably, the roller clamping component includes a roller clamping seat, a clamping roller, a support shaft, a positioning spring, and a positioning arm. The clamping roller is rotatably disposed inside one side of the roller clamping seat; the support shaft is fixedly disposed on the other side of the roller clamping seat, and the end of the support shaft is mounted on a hot melt bracket; the positioning spring is movably sleeved on the outside of the support shaft, and both ends of the positioning spring abut against the hot melt bracket and the roller clamping seat respectively; the positioning arm is fixedly disposed between the two sets of support shafts, and the positioning arm is movably inserted into the roller clamping seat.

[0018] Preferably, the hot-melt adhesive component includes an adhesive carrier plate, two sets of fitting grooves, a pressing groove, a pressing electric heating roller, an electric heating base plate, a heat insulation plate, and a guide bevel. The adhesive carrier plate is fixedly installed at the bottom of the portal frame. The two sets of fitting grooves are opened on both sides of the front end of the adhesive carrier plate, and the opposite ends of the two sets of fitting grooves are staggered and overlapped vertically. The opposite ends of the two sets of fitting grooves are provided with guide bevels. The pressing groove is opened at the end of the adhesive carrier plate. The pressing electric heating roller is rotatably installed at the top of the pressing groove. The electric heating base plate is fixedly installed at the bottom of the pressing groove. The heat insulation plate is fixedly installed below the pressing groove.

[0019] This invention discloses a processing device based on polyvinyl chloride nonwoven fabric, which has the following beneficial effects:

[0020] 1. This processing equipment based on polyvinyl chloride nonwoven fabric has a positioning unit and a folding and shaping unit between the feeding unit and the hot-melt unit. After the flat fabric passes through the feeding unit, the positioning unit flips its two sides upward to form a U-shaped structure. Then, the folding and shaping unit flips the two vertical sides together towards the center and heat-presses the two sides to form a flat tube shape. Then, it enters the hot-melt unit for hot-melt bonding of the two seams. By pre-shaping before hot-melt bonding, the flatness of the seam is ensured, and the hot-melt bonding facilitates the rolling, storage and transportation.

[0021] 2. In this processing equipment based on polyvinyl chloride nonwoven fabric, the fabric enters the hot-melt support. At this time, the two sides of the fabric, which are flattened, enter the roller clamping seat. The clamping rollers continue to hold and maintain the side positioning. At the same time, the positioning spring pushes the two sides of the fabric towards the center, so that the two sides of the fabric are squeezed towards the center. At this time, the two seams of the fabric enter the fitting groove through the guide oblique cut. Under the action of the positioning spring, the two seam edges of the fabric can be kept close to the inner wall of the fitting groove, thereby further ensuring that the seam is completely flush. At the same time, the bottom surface of the fabric bulges downward and passes through the bottom of the bonding carrier plate to avoid the bottom of the fabric being burned.

[0022] 3. In this processing equipment based on polyvinyl chloride nonwoven fabric, the fabric is inserted through the front-end open gradient frame and positioned by the feed guide plate at the end of the open gradient frame. This causes the flat fabric to gradually bend from both sides towards the center to form a U-shape and enter the U-shaped positioning frame. At this time, the two sides of the fabric pass through the positioning clamps, and the bottom of the fabric is flattened and pressed by the push flat roller. The bottom of the two sides of the fabric is pressed by the positioning pressure roller, so that the two sides of the fabric are level and at the same time, it avoids lateral displacement and jamming during the folding process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the feeding unit structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the positioning unit structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the positioning mechanism structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the folding and shaping unit structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the outer surface structure of the shaping carrier plate of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the shaping auxiliary component of the present invention;

[0031] Figure 8 This is a schematic diagram of the hot-melt unit structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the roller clamping component structure of the present invention;

[0033] Figure 10 This is a schematic diagram of the structure of the hot melt adhesive component of the present invention;

[0034] Figure 11 This is a cross-sectional view of the internal structure of the adhesive carrier plate of the present invention;

[0035] Figure 12 This is a schematic diagram of the fitting groove end face structure of the present invention.

[0036] In the diagram: 1. Feeding unit; 11. Feeding frame; 12. Material support roller; 13. Lifting roller; 14. Positioning pressure roller; 2. Positioning unit; 21. Positioning support frame; 22. Gradient opening frame; 23. Feeding guide plate; 24. U-shaped positioning frame; 25. Positioning mechanism; 251. N-shaped frame; 252. Guide rail; 253. Lifting cylinder; 254. Suspension arm; 255. Pushing roller; 256. Positioning support rod; 257. Positioning pressure roller; 26. Positioning clamp; 3. Folding and shaping unit; 31. Folding support frame; 32. Shaping carrier plate; 33. Folding cover plate; 34. Heating roller; 35. Shaping auxiliary parts; 35 1. Support block; 352. Sliding column; 353. Rotating shaft; 354. Positioning block; 355. Positioning pressure plate; 356. Positioning groove; 4. Hot melt unit; 41. Hot melt bracket; 42. Roller clamping component; 421. Roller clamping seat; 422. Clamping pressure roller; 423. Support shaft; 424. Positioning spring; 425. Positioning insert arm; 43. Portal bracket; 44. Hot melt adhesive component; 441. Adhesive carrier plate; 442. Fitting groove; 443. Pressing groove; 444. Pressing electric heating roller; 445. Electric heating base plate; 446. Heat insulation plate; 447. Guide oblique cut; 45. Material feeding clamping roller; 46. Cooling fan. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] This application provides a processing device based on polyvinyl chloride (PVC) nonwoven fabric, which solves the problem that when using existing PVC nonwoven fabric to heat-melt bond dust collector bags, if the overall tube diameter is large, the upper part of the tube is prone to collapse downwards, resulting in inaccurate seams. This means that the number of non-overlapping parts between the two seams during the hot-pressing process remains constant, leading to different seam widths. The dust collector bag formed after seaming is skewed, and the skewed seam is also prone to folding, resulting in incomplete hot pressing and leakage problems during subsequent use.

[0039] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0040] This invention discloses a processing equipment based on polyvinyl chloride nonwoven fabric.

[0041] According to the appendix Figure 1-12As shown, it includes a feeding unit 1, a positioning unit 2, a folding and shaping unit 3, and a hot-melting unit 4;

[0042] The feeding unit 1 includes a feeding frame 11, a material support roller 12, a lifting roller 13, and a positioning pressure roller 14. The material support roller 12 is installed in the feeding frame 11; the lifting roller 13 is rotatably disposed at the top inside the feeding frame 11; and the positioning pressure roller 14 is rotatably disposed at the front side of the feeding frame 11.

[0043] Positioning unit 2 includes positioning support frame 21, opening gradient frame 22, feeding guide plate 23, U-shaped positioning frame 24, positioning mechanism 25 and positioning clamp 26. The U-shaped positioning frame 24 is equipped with positioning mechanism 25. Positioning mechanism 25 squeezes and adheres polyvinyl chloride nonwoven fabric to the inner wall of U-shaped positioning frame 24 so that the two sides of polyvinyl chloride nonwoven fabric are folded upward.

[0044] The positioning support frame 21 is fixedly installed on the front side of the positioning pressure roller 14; the U-shaped positioning frame 24 is fixedly installed on the top of the positioning support frame 21; the opening gradient frame 22 is fixedly installed at one end of the U-shaped positioning frame 24 to guide the polyvinyl chloride nonwoven fabric from the positioning pressure roller 14 to the U-shaped positioning frame 24; the feeding guide plate 23 is integrally formed on the inner side of the opening gradient frame 22 near the U-shaped positioning frame 24, and a feeding gap is formed between the feeding guide plate 23 and the opening gradient frame 22; the positioning clamp 26 is installed on both sides of the U-shaped positioning frame 24 to keep the two seam edges of the polyvinyl chloride nonwoven fabric in contact with the side wall of the U-shaped positioning frame 24.

[0045] The positioning mechanism 25 includes an N-shaped frame 251, a guide rail 252, a lifting cylinder 253, a suspension arm 254, a flattening roller 255, a positioning support rod 256, and a positioning pressure roller 257. The N-shaped frame 251 is horizontally mounted on the top of the end of the U-shaped positioning frame 24. The guide rail 252 is fixedly mounted on both sides of the outer wall of the U-shaped positioning frame 24. The lifting cylinder 253 is fixedly mounted on both sides of the outer wall of the U-shaped positioning frame 24 and pushes the N-shaped frame 251 to slide up and down along the guide rail 252. The suspension arm 254 is fixedly mounted on the bottom of the N-shaped frame 251. The flattening roller 255 is rotatably mounted on the bottom of the suspension arm 254. The positioning support rod 256 is movably hinged to both sides of the suspension arm 254. The positioning pressure roller 257 is rotatably mounted on the bottom end of the positioning support rod 256 and presses the polyvinyl chloride nonwoven fabric into the corners on both sides of the bottom of the N-shaped frame 251.

[0046] More specifically, the end of the opening gradient frame 22 near the positioning pressure roller 14 is open, and the end of the opening gradient frame 22 near the U-shaped positioning frame 24 is narrowed; the outer side of the positioning clamp 26 is fixedly installed on the outer wall of the U-shaped positioning frame 24, and the inner side of the positioning clamp 26 is shaped like a "6" and forms a material feeding gap with the U-shaped positioning frame 24. The two sets of material feeding gaps make the height of the two sides of the fabric level, while preventing it from naturally drooping to the middle.

[0047] The folding and shaping unit 3 includes a folding support frame 31, a shaping carrier plate 32, a folding cover plate 33, electric heating rollers 34, and a shaping auxiliary component 35. The folding cover plate 33 is rotatably disposed on both sides of the shaping carrier plate 32. Electric heating rollers 34 are provided in the middle of both sides of the shaping carrier plate 32. After the polyvinyl chloride nonwoven fabric is folded and positioned by the folding cover plate 33, it is hot-pressed and formed by the electric heating rollers 34. The shaping carrier plate 32 is fixedly disposed on the top of the folding support frame 31. The shaping auxiliary component 35 is disposed at one end of the folding support frame 31 and extends into the shaping carrier plate 32 for folding and positioning of the polyvinyl chloride nonwoven fabric.

[0048] The shaping auxiliary component 35 includes two sets of support blocks 351, sliding columns 352, rotating shafts 353, positioning blocks 354, positioning pressure plates 355, and two sets of positioning grooves 356.

[0049] Two sets of support blocks 351 are fixedly installed on the top of both sides of the folding support frame 31; sliding columns 352 are movably inserted into the support blocks 351; rotating shaft 353 is rotatably installed between the two sets of sliding columns 352; positioning block 354 is fixedly installed in the middle of rotating shaft 353; positioning pressure plate 355 is fixedly installed at the bottom of positioning block 354, and positioning pressure plate 355 is movably inserted into shaping carrier plate 32; two sets of positioning grooves 356 are respectively opened through both sides of the outer wall of positioning block 354, and the opposite side of the two sets of positioning grooves 356 is overlapped, which is used for the overlapping positioning of the two seam edges of polyvinyl chloride nonwoven fabric.

[0050] The hot-melt unit 4 includes a hot-melt bracket 41, a roller clamping component 42, a gate-shaped bracket 43, a hot-melt adhesive component 44, two sets of feeding rollers 45, and a cooling fan 46. The hot-melt adhesive component 44 is provided between the two sets of symmetrically arranged roller clamping components 42. The two sets of roller clamping components 42 clamp and push the folded polyvinyl chloride nonwoven fabric from both sides toward the middle, so that the two seam edges of the polyvinyl chloride nonwoven fabric overlap and the seam is hot-melted and bonded by the hot-melt adhesive component 44 to form a seamless dust filter bag.

[0051] Two sets of roller clamping parts 42 are arranged on both sides of the hot melt bracket 41; the portal bracket 43 is fixedly arranged on the top of the hot melt bracket 41, and the hot melt adhesive part 44 is suspended and fixed at the bottom of the portal bracket 43; two sets of feeding clamping rollers 45 are rotatably arranged at the end of the hot melt bracket 41, and the two types of feeding clamping rollers 45 are staggered vertically; the cooling fan 46 is fixedly arranged on the hot melt bracket 41 and located between the two sets of feeding clamping rollers 45.

[0052] The roller clamping component 42 includes a roller clamping seat 421, a clamping roller 422, a support shaft 423, a positioning spring 424, and a positioning insert arm 425. The clamping roller 422 is rotatably disposed inside one side of the roller clamping seat 421. The support shaft 423 is fixedly disposed on the other side of the roller clamping seat 421, and the end of the support shaft 423 is mounted on the hot melt bracket 41. The positioning spring 424 is movably sleeved on the outside of the support shaft 423, and the two ends of the positioning spring 424 abut against the hot melt bracket 41 and the roller clamping seat 421, respectively. The positioning insert arm 425 is fixedly disposed between the two sets of support shafts 423, and the positioning insert arm 425 is movably inserted into the roller clamping seat 421.

[0053] The hot melt adhesive component 44 includes an adhesive carrier plate 441, two sets of fitting grooves 442, a pressing groove 443, a pressing electric heating roller 444, an electric heating base plate 445, a heat insulation plate 446, and a guide oblique cut 447. The adhesive carrier plate 441 is fixedly installed at the bottom of the portal frame 43. The two sets of fitting grooves 442 are opened on both sides of the front end of the adhesive carrier plate 441, and the opposite ends of the two sets of fitting grooves 442 are staggered and overlapped. The opposite ends of the two sets of fitting grooves 442 are provided with guide oblique cuts 447. The pressing groove 443 is opened at the end of the adhesive carrier plate 441. The pressing electric heating roller 444 is rotatably installed on the top of the pressing groove 443. The electric heating base plate 445 is fixedly installed at the bottom of the pressing groove 443. The heat insulation plate 446 is fixedly installed below the pressing groove 443.

[0054] Working principle: In the raw material processing stage, polyvinyl chloride (PVC) is mixed with plasticizers, stabilizers, fillers, etc. in a certain proportion, and then mixed evenly by a high-speed mixer to form a premix. The premix is ​​then fed into an extruder and heated to 160-200℃ to melt the PVC. Uniform fibers are then extruded through the extruder, and the fibers are woven to form PVC nonwoven fabric. The PVC nonwoven fabric is then wound up by a roller to form a whole roll of nonwoven fabric blank, which is ready for subsequent processing.

[0055] Then, by placing the entire roll of PVC nonwoven fabric on the outer surface of the material support roller 12, the front end of the fabric passes through the top of the lifting roller 13 and then through the two sets of positioning pressure rollers 14. At this time, the fabric is then inserted through the front opening gradient frame 22 and positioned by the feed guide plate 23 at the end of the opening gradient frame 22, so that the two sides of the flat fabric gradually bend towards the middle into a U-shape and enter the U-shaped positioning frame 24. At this time, the two sides of the fabric pass through the positioning clamp 26, and the bottom of the fabric is flattened and rolled by the flattening roller 255. The bottom of the two sides of the fabric is rolled by the positioning pressure roller 257, so that the two sides of the fabric are level.

[0056] Then the fabric is inserted into the positioning grooves 356 on both sides of the positioning block 354. At this time, the bottom of the fabric is squeezed by the positioning pressure plate 355, so that the two sides of the fabric are folded towards the middle and covered with the top of the bottom surface of the fabric. Then the top of the two sides of the fabric is pressed together by two sets of folding cover plates 33, and the pressed fabric passes through the electric heating roller 34. The electric heating roller 34 heat-presses and shapes the two sides of the fabric, so that the fabric is folded into a flat ring tube shape and the two seams overlap. The heat-pressing and shaping ensures that the seams are flush.

[0057] The fabric then continues to move backward into the hot-melt support 41. At this point, the two flattened sides of the fabric enter the roller clamping seat 421, where the clamping rollers 422 continue to hold and position the sides. Simultaneously, the positioning springs 424 push the two sides of the fabric towards the center, causing the fabric to be squeezed towards the center. At this time, the two seams of the fabric enter the fitting groove 442 through the guide oblique cut 447. Under the action of the positioning springs 424, the two seam edges of the fabric are kept close to the inner wall of the fitting groove 442, thus ensuring that the seams are completely flush. At the same time, the bottom surface of the fabric faces downward. The fabric rises and passes through the bottom of the bonding carrier plate 441. At this time, the fabric moves forward and is pressed by the pressing electric heating roller 444 and the electric heating base plate 445. Finally, the two seams of the fabric are heat-pressed and bonded while ensuring flatness, thus forming a tubular structure. Then the tubular fabric moves to the rear end and passes outward from between the two sets of feeding clamping rollers 45 above. Then it goes down and passes out from the inside out from the two sets of feeding clamping rollers 45 below. At this time, the cooling fan 46 blows air to cool the seam, thus realizing the complete hot melt bonding molding of polyvinyl chloride nonwoven fabric to make dust collection bags.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A processing device based on polyvinyl chloride nonwoven fabric, characterized in that, include; Feeding unit (1); The positioning unit (2) includes a U-shaped positioning frame (24), and a positioning mechanism (25) is provided inside the U-shaped positioning frame (24). The positioning mechanism (25) squeezes and adheres the polyvinyl chloride nonwoven fabric to the inner wall of the U-shaped positioning frame (24) so ​​that the two sides of the polyvinyl chloride nonwoven fabric are folded upward. The folding and shaping unit (3) includes a shaping carrier plate (32) and folding cover plates (33) rotatably disposed on both sides of the shaping carrier plate (32). Electric heating rollers (34) are provided in the middle of both sides of the shaping carrier plate (32). After the polyvinyl chloride nonwoven fabric is folded and positioned by the folding cover plates (33), it is hot-pressed and formed by the electric heating rollers (34). The hot melt unit (4) includes two sets of symmetrically arranged roller clamping parts (42) and a hot melt adhesive part (44) disposed between the two sets of roller clamping parts (42). The two sets of roller clamping parts (42) clamp and push the two sides of the folded polyvinyl chloride nonwoven fabric towards the middle, so that the two seam edges of the polyvinyl chloride nonwoven fabric overlap and the seam is hot melt bonded by the hot melt adhesive part (44) to form a seamless dust filter bag. The positioning unit (2) also includes; The positioning support frame (21) is fixedly installed on the front side of the positioning pressure roller (14); The U-shaped positioning frame (24) is fixedly installed on the top of the positioning support frame (21); An opening gradient frame (22) is fixedly set at one end of a U-shaped positioning frame (24) to guide the polyvinyl chloride nonwoven fabric from the positioning pressure roller (14) to the U-shaped positioning frame (24); The feed guide plate (23) is integrally formed on the inner side of the end of the opening gradient frame (22) near the U-shaped positioning frame (24), and a feed gap is formed between the feed guide plate (23) and the opening gradient frame (22); Positioning clips (26) are installed on both sides of the U-shaped positioning frame (24) to keep the two seam edges of the polyvinyl chloride nonwoven fabric in contact with the side wall of the U-shaped positioning frame (24); The positioning mechanism (25) includes; The N-type frame (251) is positioned across the top of the end of the U-shaped positioning frame (24); The guide rail (252) is fixedly installed on both sides of the outer wall of the U-shaped positioning frame (24); The lifting cylinder (253) is fixedly installed on both sides of the outer wall of the U-shaped positioning frame (24); and the lifting cylinder (253) pushes the N-shaped frame (251) to slide up and down along the guide rail (252); The suspension arm (254) is fixedly mounted on the bottom of the N-type frame (251); A flattening roller (255) is rotatably mounted at the bottom of a suspension arm (254); Positioning strut (256), which is movably hinged to both sides of the suspension arm (254); The positioning pressure roller (257) is rotatably set at the bottom end of the positioning support rod (256), and the positioning pressure roller (257) presses the polyvinyl chloride nonwoven fabric into the bottom two corners of the N-type frame (251); The folding and shaping unit (3) also includes; Folding support frame (31), the shaping carrier plate (32) is fixedly installed on the top of the folding support frame (31); A shaping auxiliary component (35) is provided at one end of the folding support frame (31), and the shaping auxiliary component (35) extends into the shaping carrier plate (32) for folding and positioning of polyvinyl chloride nonwoven fabric; The shaping auxiliary component (35) includes; Two sets of support blocks (351) are fixedly installed on the top of both sides of the folding support frame (31); A sliding column (352) is movably inserted into a support block (351); A rotating shaft (353) is rotatably disposed between two sets of sliding columns (352); The positioning block (354) is fixedly installed in the middle of the rotating shaft (353); The positioning plate (355) is fixedly set at the bottom end of the positioning block (354), and the positioning plate (355) is movably inserted into the shaping carrier plate (32); Two sets of positioning grooves (356) are respectively opened through the outer wall of the positioning block (354), and the opposite sides of the two sets of positioning grooves (356) are overlapped, which is used for the overlapping positioning of the two seam edges of the polyvinyl chloride nonwoven fabric.

2. The processing equipment based on polyvinyl chloride nonwoven fabric according to claim 1, characterized in that: The feeding unit (1) includes: Loading rack (11); Material support roller (12), which is installed in the feeding frame (11); The lifting roller (13) is rotatably mounted on the top of the feeding frame (11); Positioning roller (14) is rotatably mounted on the front side of the feeding frame (11).

3. The processing equipment based on polyvinyl chloride nonwoven fabric according to claim 2, characterized in that: The opening gradient frame (22) is open at one end near the positioning pressure roller (14), and narrowed at the other end near the U-shaped positioning frame (24). The outer side of the positioning clamp (26) is fixedly installed on the outer wall of the U-shaped positioning frame (24), and the inner side of the positioning clamp (26) is shaped like a "6" and forms a material feeding gap with the U-shaped positioning frame (24).

4. The processing equipment based on polyvinyl chloride nonwoven fabric according to claim 1, characterized in that: The hot melt unit (4) also includes; A hot melt support (41) is provided on both sides of the hot melt support (41); A portal frame (43) is fixedly mounted on the top of a hot melt bracket (41), and the hot melt adhesive (44) is suspended and fixed to the bottom of the portal frame (43); Two sets of feeding clamps (45) are rotatably mounted at the end of the hot melt support (41), and the two types of feeding clamps (45) are staggered vertically. Cooling fan (46) is fixedly mounted on hot melt support (41) and located between two sets of feeding clamps (45).

5. The processing equipment based on polyvinyl chloride nonwoven fabric according to claim 4, characterized in that: The roller clamping member (42) includes; Roller clamping seat (421); The clamping roller (422) is rotatably disposed inside one side of the roller clamping seat (421); The support shaft (423) is fixedly disposed on the other side of the roller clamping seat (421), and the end of the support shaft (423) is mounted on the hot melt bracket (41); The positioning spring (424) is movably sleeved on the outside of the support shaft (423), and the two ends of the positioning spring (424) abut against the hot melt bracket (41) and the roller clamping seat (421) respectively; The positioning arm (425) is fixedly set between two sets of support shafts (423), and the positioning arm (425) is movably inserted into the roller clamping seat (421).

6. The processing equipment based on polyvinyl chloride nonwoven fabric according to claim 5, characterized in that: The hot melt adhesive (44) includes; An adhesive carrier plate (441) is fixedly mounted on the bottom of a portal frame (43); Two sets of fitting grooves (442) are provided on both sides of the front end of the adhesive carrier plate (441), and the opposite ends of the two sets of fitting grooves (442) are staggered and overlapped. The opposite ends of the two sets of fitting grooves (442) are provided with guide oblique cuts (447). A pressing groove (443) is formed at the end of the bonding carrier plate (441); A pressing electric heating roller (444) is rotatably mounted on top of the pressing groove (443); The electric heating base plate (445) is fixedly installed at the bottom of the pressing groove (443); The heat insulation board (446) is fixedly installed below the pressing groove (443).

Images