PVC film production thinning device with gradient heating function

Abstract

This invention relates to the technical field of auxiliary devices for PVC film production, and more particularly to a PVC film thinning device with gradient heating function. The invention provides such a PVC film thinning device with gradient heating function, comprising a frame, film rollers, a drive module, a take-up roller, and a cooling roller. The film roller is detachably and rotatably mounted on the right side of the frame, with damping between them. The drive module is mounted on the left side of the frame, and the take-up roller is engaged with the drive module. A cooling roller is mounted on the left side of the frame, located to the right of the take-up roller, via a bearing. The heating rollers are arranged in a stepped distribution, and the hot oil delivery creates a temperature gradient, enabling precise temperature control according to the requirements of each stage of film stretching, effectively improving the film stretching quality, resulting in better film thickness uniformity and more stable physical properties.

Description

Technical Field

[0001] This invention relates to the technical field of auxiliary devices for PVC film production, and in particular to a PVC film thinning device with gradient heating function. Background Technology

[0002] In the PVC film production industry, the thinning process has a crucial impact on the quality and performance of the final product. However, traditional PVC film thinning equipment still faces many challenges in terms of the precision of heat control and the consistency of film stretching effect.

[0003] Early thinning equipment typically used a single type of heating element (such as resistance wire) for heating, and these heating elements were often arranged in a concentrated manner. This layout resulted in uneven temperature distribution within the heating area, especially in the width direction of the film, where there was a significant temperature difference between the edges and the center.

[0004] Furthermore, considering that PVC film has different temperature requirements at different stretching stages, a relatively low temperature is needed initially to maintain the necessary rigidity of the film for initial stretching. As the stretching process progresses, the temperature needs to be gradually increased to enhance the film's plasticity for further thinning. Unfortunately, traditional thinning devices struggle to precisely control the temperature gradient. For example, some devices employ a constant-temperature heating mode, maintaining the same temperature level throughout the stretching process. This can lead to overstretching or cracking of the film in the initial stretching stage due to overheating, or insufficient temperature in the later stages, hindering further stretching and preventing the achievement of the desired thinness target. Summary of the Invention

[0005] To overcome the aforementioned drawbacks, the present invention provides a PVC film production thinning apparatus with gradient heating function.

[0006] The technical solution is as follows: A PVC film production thinning device with gradient heating function includes a frame, a film roller, a drive module, a take-up roller, and a cooling roller. The film roller is detachably and rotatably mounted on the right side of the frame, and there is damping between the two. The drive module is mounted on the left side of the frame, and the take-up roller is clamped on the drive module. The cooling roller is mounted on the left side of the frame to the right of the take-up roller via a bearing. It also includes a heating roller, a clamping roller, a slider, and a heating component. Multiple heating rollers are rotatably connected in a stepped manner in the middle of the frame via bearings. A slider is symmetrically slidably connected on the frame near the leftmost heating roller. A clamping roller is rotatably connected between two sliders via a bearing. The clamping roller is located to the left of the leftmost heating roller. The heating roller and the clamping roller are hollow inside and are equipped with a heating component for injecting hot oil into the cavity.

[0007] To further explain, the heating assembly includes a heating box, a pump, a transfer pipe, a distribution pipe, a return pipe, and a transfer pipe. The clamping roller is rotatably connected to the front end of the leftmost heating roller and is connected to the transfer pipe. The transfer pipe is fixed to the outer wall of the frame and is sealed to the clamping roller and the heating roller. Adjacent heating rollers are connected in series through distribution pipes with alternating endpoints. That is, the rear end of the first heating roller is connected to the rear end of the second heating roller through a distribution pipe, and the front end of the second heating roller is connected to the front end of the third heating roller through a distribution pipe, and so on, forming a stepped series structure. The return pipe is supported on the outer wall of the frame and is connected to the heating roller in a sealed rotatable manner. The rear end of the clamping roller is connected to an adjacent return pipe and is connected to a transfer pipe. The transfer pipe is connected to the clamping roller in a sealed rotatable manner. Both the transmission pipe and the transfer pipe are equipped with expansion joints in the middle to accommodate the movement and adjustment of the clamping roller. A heating box is installed on the left side of the front part of the frame. The front end of the rightmost heating roller is connected to the heating box and is connected to the return pipe. The return pipe is connected to the rightmost heating roller in a sealed rotatable manner. A pump is installed on the top of the heating box, and the transmission pipe is connected to the liquid outlet pipe on the top of the pump.

[0008] To further explain, it also includes electric cylinders and moving blocks. Electric cylinders are symmetrically installed front and back on the upper left side of the frame. Moving blocks are connected to the telescopic rods of the electric cylinders. The moving blocks are slidably connected to the outer wall of the frame through guide rails and are connected to the slider on the same side.

[0009] Further explanation: It also includes a motor, a geared disc, a connecting block, a rack, and a splined shaft. The motor is mounted on the front upper part of the frame. A splined groove is provided on the motor output shaft. The splined shaft is slidably connected to the motor output shaft. A rack is connected to the left end of the splined shaft. A connecting block is connected to the left side of the rack. The connecting block is fixed on the moving block. The front end of the clamping roller passes through the slider and the moving block and is connected to the geared disc. Similarly, the front end of the leftmost heating roller passes through the frame and is connected to the geared disc. The two geared discs mesh with the rack, respectively.

[0010] To further explain, it also includes an air supply pipe and a jet pipe. The jet pipe is slidably connected between the left sides of the two sliders, and the air supply pipe is connected and communicated with the top left side of the heating box. The upper end of the air supply pipe is slidably and sealed to the front end of the jet pipe through a sealing slip ring.

[0011] To further explain, it also includes a buffer spring, a wave plate, and a protrusion. Buffer springs are connected between both ends of the jet pipe and the corresponding sliders. Wave plates are installed at both ends of the clamping roller. Protrusions are connected to the front and rear ends of the jet pipe, and the protrusions are in close contact with the wave plates.

[0012] Further explanation: It also includes cylinders, support blocks, U-shaped clamps and clamping springs. Cylinders are symmetrically installed on the right side of the frame. Support blocks are connected to the cylinder extension rods. U-shaped clamps are slidably connected to the support blocks. Two clamping springs are connected between the U-shaped clamps and the support blocks. The U-shaped clamps are engaged with both ends of the receiving roller.

[0013] To further explain, it also includes a friction plate, which is connected to the inner side of the U-shaped clamp and its shape fits tightly against the inner side of the U-shaped clamp.

[0014] The beneficial effects of the present invention are as follows: 1. The heating rollers are distributed in a stepped manner, and the hot oil conveying forms a temperature gradient, which can accurately control the temperature according to the requirements of each stage of film stretching, effectively improve the film stretching quality, make the film thickness more uniform, and make the physical properties more stable.

[0015] 2. The electric cylinder and moving block work together to precisely adjust the position of the clamping rollers, meeting the thinning requirements of films of different thicknesses. The transmission structure, consisting of a motor, gear plate, rack, and spline shaft, ensures that the clamping rollers and the leftmost heating roller rotate synchronously during adjustment, guaranteeing uniform film stretching.

[0016] 3. The air supply pipe and jet pipe transmit the steam generated by the hot oil in the heating box to the surface of the clamping roller. The steam increases the flexibility and extensibility of the film, reduces the breakage caused by brittleness during stretching, and at the same time reduces the friction between the film and the roller shaft, making the film more uniformly stressed and improving the thinning effect.

[0017] 4. The combination of buffer springs, wave discs, and bumps ensures that the steam ejected from the jet pipe is evenly distributed on the surface of the clamping rollers, ensuring a more uniform effect of the steam on the film and further optimizing the performance improvement effect during the film thinning process.

[0018] 5. The structure of the cylinder, support block, U-clamp, clamping spring and friction plate can change the compression force of the clamping spring by adjusting the position of the U-clamp, thereby flexibly adjusting the rotation resistance of the film roller, adapting to the diverse requirements of film roller resistance during different film thinning processes, and improving the versatility of the device. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a three-dimensional structural diagram of the heating box, pump, and transmission pipe of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the drive module, take-up roller, and cooling roller of the present invention.

[0022] Figure 4 This is a schematic diagram of the planar structure of the components such as the transmission pipe, the splitter pipe, and the transfer pipe of the present invention.

[0023] Figure 5 This is a schematic diagram of the planar structure of the components of the present invention, such as the reflux pipe, heating box, and transmission pipe.

[0024] Figure 6 This is a diagram showing the state of the film when the clamping roller and the heating roller of the present invention are used together to stretch the film.

[0025] Figure 7 This is a three-dimensional structural diagram of the components of the present invention, including the electric cylinder, the moving block, and the motor.

[0026] Figure 8 This is a three-dimensional structural diagram of the toothed disc, connecting block, and toothed rod of the present invention.

[0027] Figure 9 This is a diagram showing the state of the toothed rod of the present invention when it meshes with the toothed discs on both sides.

[0028] Figure 10 This is a three-dimensional structural diagram of the components of the present invention, such as the motor, gear plate, and spline shaft.

[0029] Figure 11 This is a three-dimensional structural diagram of the components of the present invention, such as the gas delivery pipe, clamping roller, and slider.

[0030] Figure 12 This is a three-dimensional structural diagram of the components of the present invention, including the air supply pipe, the jet pipe, and the buffer spring.

[0031] Figure 13 This is a three-dimensional structural diagram of the clamping roller, jet pipe, and air delivery pipe components of the present invention.

[0032] Figure 14 This is a three-dimensional structural diagram of the components such as the buffer spring, wave disk, and protrusion of the present invention.

[0033] Figure 15 This is a diagram showing the state when the wave disks on both sides of the present invention are tightly engaged with the corresponding protrusions.

[0034] Figure 16 This is a three-dimensional structural diagram of the cylinder, support block, and U-shaped clamp of the present invention.

[0035] Figure 17 This is a three-dimensional structural diagram of the U-shaped clamp, clamping spring, and friction plate components of the present invention.

[0036] In the above attached diagram: 1: Frame, 101: Film roller, 102: Drive module, 103: Take-up roller, 104: Heating roller, 105: Clamping roller, 1051: Slider, 106: Cooling roller, 201: Heating box, 202: Pump, 203: Transfer pipe, 204: Diverter pipe, 205: Return pipe, 206: Transfer pipe, 301: Electric cylinder, 302: Moving block, 401: Motor, 402: Gear plate, 403: Connecting block, 404: Gear rack, 405: Splined shaft, 501: Air supply pipe, 502: Jet nozzle, 601: Buffer spring, 602: Wave plate, 603: Protrusion, 701: Cylinder, 702: Support block, 703: U-shaped clamp, 704: Clamping spring, 705: Friction plate. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0038] Example 1: A PVC film thinning device with gradient heating function, such as... Figures 1-6 As shown, the system includes a frame 1, a film roller 101, a drive module 102, a take-up roller 103, a heating roller 104, a clamping roller 105, a slider 1051, a cooling roller 106, and a heating assembly. The film roller 101 is detachably and rotatably mounted on the right side of the frame 1, with damping between them. The drive module 102 is bolted to the left side of the frame 1, and the take-up roller 103 is snapped onto the drive module 102 for winding the stretched film. Multiple heating rollers 104 are rotatably connected in a stepped manner in the middle of the frame 1 via bearings. The heating roller 104 is positioned closer to the leftmost heating roller 104 on the frame 1. A slider 1051 is symmetrically slidably connected to the rear. A clamping roller 105 is rotatably connected between the two sliders 1051 via a bearing. The clamping roller 105 is located to the left of the leftmost heating roller 104. A cooling roller 106 is installed on the left side of the frame 1 below the clamping roller 105 via a bearing. The cooling roller 106 can be connected to an external cooling device to maintain a low temperature and is used to cool the thinned film. The heating roller 104 and the clamping roller 105 are hollow inside and are equipped with heating components to inject hot oil into the cavity to maintain the high temperature of the clamping roller 105 and the heating roller 104.

[0039] like Figures 2-6As shown, the heating assembly includes a heating box 201, a pump 202, a transmission pipe 203, a diversion pipe 204, a return pipe 205, and a transfer pipe 206. The clamping roller 105 is rotatably connected to the front end of the leftmost heating roller 104 and is connected to the transmission pipe 203. The transmission pipe 203 is fixed to the outer wall of the frame 1 and is sealed to the clamping roller 105 and the heating roller 104. Adjacent heating rollers 104 are connected in series via the diversion pipe 204 with alternating endpoints, i.e., the rear end of the first heating roller 104 is connected to the rear end of the second heating roller 104. The rear end is connected via a diversion pipe 204. The front end of the second heating roller 104 is connected to the front end of the third heating roller 104 via a diversion pipe 204, and so on, forming a stepped series structure. The return pipe 205 is supported on the outer wall of the frame 1 and has a sealed rotatable connection with the heating roller 104 to ensure that the heating roller 104 can rotate normally without being affected by the return pipe 205. The rear end of the clamping roller 105 is connected to an adjacent return pipe 205 and is connected to a transfer pipe 206. The transfer pipe 206 has a sealed rotatable connection with the clamping roller 105. Both the transmission pipe 203 and the transfer pipe 206 are equipped with expansion joints in the middle to accommodate the movement and adjustment of the clamping roller 105. A heating tank 201 containing oil is installed on the front left side of the frame 1. The front end of the rightmost heating roller 104 is connected to the heating tank 201 and connected to a return pipe 205. The return pipe 205 and the rightmost heating roller 104 are connected in a sealed rotatable connection. A pump 202 is installed on the top of the heating tank 201, and the transmission pipe 203 is connected to the outlet pipe on the top of the pump 202 to facilitate the delivery of hot oil to the clamping roller. The distribution of the heat-conducting medium and the heat exchange area inside the cavities of rollers 105 and heating rollers 104, from the rightmost heating roller 104 to the leftmost heating roller 104, are specially designed. For example, the amount of heat-conducting medium inside the rightmost heating roller 104 is relatively small, and the surface area of ​​the heat exchange pipe is small. As the heating roller 104 moves to the left, the amount of heat-conducting medium gradually increases, and the surface area of ​​the heat exchange pipe also gradually increases. This makes it possible for each heating roller 104 to absorb and transfer different amounts of heat from the hot oil to the film within the same time period.

[0040] like Figures 7-9 As shown, it also includes an electric cylinder 301 and a moving block 302. The electric cylinder 301 is symmetrically installed on the upper left side of the frame 1 by bolts. The moving block 302 is connected to the telescopic rod of the electric cylinder 301. The moving block 302 is slidably connected to the outer wall of the frame 1 by a guide rail and is connected to the slider 1051 on the same side.

[0041] like Figures 7-10As shown, it also includes a motor 401, a gear 402, a connecting block 403, a rack 404, and a spline shaft 405. The motor 401 is bolted to the upper front side of the frame 1. A spline groove is provided on the output shaft of the motor 401. The spline shaft 405 is slidably connected to the output shaft of the motor 401. The rack 404 is connected to the left end of the spline shaft 405. The connecting block 403 is welded to the left side of the rack 404. The connecting block 403 is fixed on the moving block 302. The front end of the clamping roller 105 passes through the slider 1051 and the moving block 302 and is connected to the gear 402. Similarly, the front end of the leftmost heating roller 104 passes through the frame 1 and is connected to the gear 402. The two gears 402 mesh with the rack 404 respectively.

[0042] During film thinning, the film roller 101 with the film wound up is first installed in the designated mounting position on the right side of the frame 1. One end of the film is pulled, causing it to pass over each heating roller 104 in a wave-like motion from right to left. Then, it passes down over the cooling roller 106 through the gap between the leftmost heating roller 104 and the clamping roller 105. Finally, the end of the film is fixed on the take-up roller 103. Next, the position of the clamping roller 105 is adjusted according to the required film thickness. The electric cylinder 301 is activated. The extension and retraction of the extension rod of the electric cylinder 301 drives the moving block 302 to move left and right along the guide rail on the outer wall of the frame 1, thereby driving the slider 1051 to move synchronously. Finally, the clamping roller 105 is moved to the appropriate position to clamp the film. During the adjustment process, the movement of the moving block 302 and the clamping roller 105 drives the connecting block 403, the toothed rod 404 and the spline shaft 405 to move synchronously. At the same time, the toothed disc 402 on the left side also moves synchronously. Because the length of the rack 404 is reasonably designed, it always maintains meshing with the rack discs 402 on both sides within its range of motion. After the preparation is completed, the pump 202 is started. The pump 202 pumps the high-temperature hot oil in the heating box 201 through the transmission pipe 203 to the internal cavity of the clamping roller 105 and the internal cavity of the leftmost heating roller 104. Then, the hot oil is diverted to the remaining heating rollers 104 through the transfer pipe 206 and each diversion pipe 204, so as to heat all the heating rollers 104. At this time, the drive module 102 and motor 401 are started. The drive module 102 drives the take-up roller 103 to rotate, generating a pulling force to the left, which pulls the film to the left and conveys it. After the motor 401 starts, its output shaft rotates, which drives the spline shaft 405 to rotate, and then drives the rack 404 to rotate. The rack 404, through meshing with the gear discs 402 on both sides, drives the clamping roller 105 and the leftmost heating roller 104 to rotate, thereby pulling the film to the left at a uniform speed. The remaining heating rollers 104 will also rotate due to the friction between them and the film. The film roller 101 also rotates when the film is pulled. Due to the damping between it and the frame 1, it provides a certain resistance. Multiple heating rollers 104 are distributed in a stepped manner, and the hot oil is transported from left to right. The temperature of the hot oil gradually decreases during the heat transfer process, resulting in a stepped temperature difference on the heating rollers 104. During the film transport from right to left, the temperature increases sequentially, and the stretching of the film also increases sequentially. Finally, the film is stretched to the required thickness by the clamping action of the clamping roller 105 and the leftmost heating roller 104. The oil in the rightmost heating roller 104 will eventually flow back to the heating box 201 through the return pipe 205. The heating box 201 heats the oil to achieve circulation. After being stretched, the film is cooled by the cooling roller 106. The cooling roller 106 is connected to an external cooling device to maintain a low temperature, which can quickly reduce the film temperature and set it.Finally, the cooled film is wound onto the take-up roller 103 to complete the continuous thinning process of the film. After the work is completed, the drive module 102, the pump 202 and the motor 401 are turned off, and then the take-up roller 103 containing the film is disassembled to remove the finished film.

[0043] Example 2: Based on Example 1, such as Figures 11-15 As shown, it also includes a gas supply pipe 501 and a jet pipe 502. The jet pipe 502 is slidably connected between the left sides of the two sliders 1051. The gas supply pipe 501 is connected and communicated to the top left side of the heating box 201. The upper end of the gas supply pipe 501 is slidably connected to the front end of the jet pipe 502 through a sealing slip ring, which ensures the sealing of the steam transmission process and does not hinder the sliding of the jet pipe 502 relative to the gas supply pipe 501.

[0044] Steam generated during the heating of hot oil inside the heating chamber 201 is transmitted to the jet pipe 502 via the gas supply pipe 501, and then sprayed out onto the surface of the clamping roller 105 through the evenly distributed jet holes on the jet pipe 502. The steam can make the surface of the clamping roller 105 moist. When the film comes into contact with the clamping roller 105, the moisture will penetrate to the surface of the film. Due to the plasticizing effect of the moisture, the flexibility and ductility of the film can be significantly increased. During the film stretching process, the brittleness of the material is improved, thereby effectively reducing the breakage caused by the brittleness of the material. At the same time, the moisture forms a water film between the film and the roller, which reduces the friction between the film and the roller to a certain extent, making the stress on the film more uniform during the stretching process, which is beneficial to improving the quality and stability of film thinning.

[0045] like Figures 12-15 As shown, it also includes a buffer spring 601, a wave plate 602, and a protrusion 603. The front and rear ends of the jet pipe 502 are connected to the corresponding sliders 1051 by buffer springs 601. The front and rear ends of the clamping roller 105 are respectively connected by keys to install the wave plate 602 to ensure that the wave plate 602 and the clamping roller 105 rotate synchronously. The front and rear ends of the jet pipe 502 are respectively connected to protrusions 603. The protrusions 603 and the wave plate 602 are in close contact and fit together. Specifically, the front protrusion 603 precisely abuts against the groove of the wave plate 602, and the rear protrusion 603 is pushed by the protrusion of the wave plate 602, thus forming an interlocking fit structure.

[0046] When the clamping roller 105 rotates to stretch and transport the film, the corrugated disk 602 rotates synchronously. During the rotation of the corrugated disk 602, its unique wavy profile interacts with the protrusion 603. The corrugated disk 602 can push the protrusion 603 and the jet pipe 502 to slide back and forth. During this process, the buffer spring 601 always provides a stable restoring force for the jet pipe 502, ensuring the smoothness of the jet pipe 502 during the sliding process. This allows the steam ejected from the jet pipe 502 to be more evenly distributed on the surface of the clamping roller 105, and thus more evenly applied to the film. This further improves the flexibility and stress uniformity of the film during the stretching process, ensuring the high quality of the stretching process.

[0047] like Figures 16-17 As shown, it also includes a cylinder 701, a support block 702, a U-shaped clamp 703, a clamping spring 704, and a friction plate 705. The cylinder 701 is symmetrically installed on the front and back of the right side of the frame 1. The support block 702 is connected to the telescopic rod of the cylinder 701. The U-shaped clamp 703 is slidably connected to the support block 702. Two clamping springs 704 are connected between the U-shaped clamp 703 and the support block 702. The friction plate 705 is glued to the inner side of the U-shaped clamp 703. The friction plate 705 is made of rubber composite material with high friction coefficient and good wear resistance. Its shape is closely fitted to the inner side of the U-shaped clamp 703 to ensure maximum contact area and friction force.

[0048] By activating cylinder 701, its telescopic rod extends, causing support block 702 and U-shaped clamp 703 to move to the left. The opening of U-shaped clamp 703 can just engage with the front and rear ends of film roller 101. As U-shaped clamp 703 continues to move to the left, film roller 101 will generate a reaction force on U-shaped clamp 703, causing clamping spring 704 to be compressed. During the compression process, clamping spring 704 stores elastic potential energy, providing power for U-shaped clamp 703 to continuously apply pressure to film roller 101. Friction plate 705 is in direct contact with both ends of film roller 101. Due to the high coefficient of friction of friction plate 705, a large frictional force is generated between friction plate 705 and film roller 101 during the rotation of film roller 101. At the same time, by adjusting the position of U-shaped clamp 703 on support block 702, By changing the compression degree of the clamping spring 704, when the U-shaped clamp 703 moves away from the center of the support block 702, the compression of the clamping spring 704 increases, which increases the pressure exerted by the friction plate 705 on both ends of the film roller 101, thereby increasing the resistance when the film roller 101 rotates. Conversely, when the U-shaped clamp 703 moves closer to the center of the support block 702, the compression of the clamping spring 704 decreases, and the resistance when the film roller 101 rotates also decreases accordingly. During the film thinning process, the operator can flexibly adjust the position of the U-shaped clamp 703 to precisely control the compression force of the clamping spring 704 according to the actual production needs, thereby accurately adjusting the resistance of the film roller 101 to adapt to the thinning process requirements of films of different materials and thicknesses, and improve the versatility and production efficiency of the thinning device.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A PVC film production thinning device with gradient heating function, comprising a frame (1), a film roller (101), a drive module (102), a take-up roller (103), and a cooling roller (106), wherein the film roller (101) is detachably and rotatably mounted on the right side of the frame (1), and there is damping between the two; the drive module (102) is mounted on the left side of the frame (1), and the take-up roller (103) is snapped onto the drive module (102); and the cooling roller (106) is mounted on the left side of the frame (1) at the position to the right of the take-up roller (103) via a bearing, characterized in that, It also includes a heating roller (104), a clamping roller (105), a slider (1051), and a heating assembly. Multiple heating rollers (104) are rotatably connected in a stepped manner via bearings in the middle of the frame (1). A slider (1051) is symmetrically slidably connected to the leftmost heating roller (104) on the frame (1). A clamping roller (105) is rotatably connected between two sliders (1051) via bearings. The clamping roller (105) is located to the left of the leftmost heating roller (104). The heating roller (104) and the clamping roller (105) are hollow inside and equipped with a heating assembly for injecting hot oil into the cavity. It also includes an air supply pipe (501) and a jet pipe (502). A jet pipe (502) is slidably connected between the left sides of two sliders (1051). The top left side of the heating box (201) is connected and connected to... It includes an air supply pipe (501), the upper end of which is connected to the front end of the jet pipe (502) in a sealed sliding connection via a sealing slip ring; it also includes a buffer spring (601), a wave plate (602) and a protrusion (603). The two ends of the jet pipe (502) are connected to the corresponding slider (1051) by the buffer spring (601). The two ends of the clamping roller (105) are respectively equipped with wave plates (602). The front and rear ends of the jet pipe (502) are respectively connected with protrusions (603). The protrusions (603) and the wave plate (602) are in close contact and fit together. During the rotation of the wave plate (602), the wave plate (602) can push the protrusions (603) and the jet pipe (502) to slide back and forth. The buffer spring (601) provides a stable restoring force for the jet pipe (502) throughout the process.

2. The PVC film thinning device with gradient heating function according to claim 1, characterized in that, The heating assembly includes a heating box (201), a pump (202), a transmission pipe (203), a diversion pipe (204), a return pipe (205), and a transfer pipe (206). The clamping roller (105) is rotatably connected to the front end of the leftmost heating roller (104) and is connected to the transmission pipe (203). The transmission pipe (203) is fixed on the outer wall of the frame (1) and is sealed to the clamping roller (105) and the heating roller (104). Adjacent heating rollers (104) are connected in series through the diversion pipe (204) with alternating endpoints. That is, the rear end of the first heating roller (104) is connected to the rear end of the second heating roller (104) through the diversion pipe (204), and the front end of the second heating roller (104) is connected to the front end of the third heating roller (104) through the diversion pipe (204), and so on, forming a stepped series structure. The return pipe ( 205) is supported on the outer wall of the frame (1) and is sealed and rotated with the heating roller (104). The rear end of the clamping roller (105) is connected to an adjacent return pipe (205) and connected to a transfer pipe (206). The transfer pipe (206) is sealed and rotated with the clamping roller (105). The middle of the transmission pipe (203) and the transfer pipe (206) are equipped with expansion joints to accommodate the movement and adjustment of the clamping roller (105). The heating box (201) is installed on the left side of the front part of the frame (1). The front end of the rightmost heating roller (104) is connected to the heating box (201) and connected to the return pipe (205). The return pipe (205) is sealed and rotated with the rightmost heating roller (104). The pump (202) is installed on the top of the heating box (201). The transmission pipe (203) is connected to the liquid outlet pipe on the top of the pump (202).

3. The PVC film thinning device with gradient heating function according to claim 2, characterized in that, It also includes an electric cylinder (301) and a moving block (302). The electric cylinder (301) is symmetrically installed on the upper left side of the frame (1). The moving block (302) is connected to the telescopic rod of the electric cylinder (301). The moving block (302) is slidably connected to the outer wall of the frame (1) through the guide rail and is connected to the slider (1051) on the same side.

4. A PVC film thinning device with gradient heating function according to claim 3, characterized in that, It also includes a motor (401), a gear plate (402), a connecting block (403), a rack (404), and a spline shaft (405). The motor (401) is installed on the upper front side of the frame (1). A spline groove is provided on the output shaft of the motor (401). The spline shaft (405) is slidably connected to the output shaft of the motor (401). The left end of the spline shaft (405) is connected to the rack (404). The left side of the rack (404) is connected to the connecting block (403). The connecting block (403) is fixed on the moving block (302). The front end of the clamping roller (105) passes through the slider (1051) and the moving block (302) and is connected to the gear plate (402). Similarly, the front end of the leftmost heating roller (104) passes through the frame (1) and is connected to the gear plate (402). The two gear plates (402) mesh with the rack (404) respectively.

5. A PVC film thinning device with gradient heating function according to claim 1, characterized in that, It also includes a cylinder (701), a support block (702), a U-shaped clamp (703) and a clamping spring (704). The cylinder (701) is symmetrically installed on the right side of the frame (1). The support block (702) is connected to the telescopic rod of the cylinder (701). The U-shaped clamp (703) is slidably connected to the support block (702). Two clamping springs (704) are connected between the U-shaped clamp (703) and the support block (702). The U-shaped clamp (703) is engaged with both ends of the receiving roller (103).

6. A PVC film thinning device with gradient heating function according to claim 5, characterized in that, It also includes a friction plate (705), and the friction plate (705) is connected to the inner side of the U-shaped clamp (703), the shape of which is closely fitted to the inner side of the U-shaped clamp (703).

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