An automatic adjustable TPU car cover film die head with heat insulation device

Abstract

The present invention discloses an automatically adjustable TPU car cover film die with a heat insulation device, which comprises an upper die body, a lower die body is fixedly arranged below the upper die body, a middle die body 1 is fixedly arranged on one side of the upper die body, a middle die body 2 is fixedly arranged on one side of the lower die body, and the middle die body 1 is located directly above the middle die body 2, a clamping block is clamped at the oblique upper part of the other side of the upper die body, an automatic adjustment device is fixedly installed above the clamping block, and a plurality of groups of heat insulation devices are also installed between the four die bodies, namely, the upper die body, the lower die body, the middle die body 1 and the middle die body 2. The automatic adjustment device comprises an outer shell, and three screws are evenly arranged inside the outer shell, and a fixing groove is provided at one end of each screw. The device solves the problems of poor heat insulation effect between die bodies inside the current die head and low quality of plastic extrusion products.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic extrusion, and in particular relates to an automatically adjustable TPU car cover film die head with a heat insulation device. Background Art

[0002] The TPU car cover film die head is responsible for evenly extruding the molten TPU material and, through a specific flow channel design, allowing the material to form a film with a specific shape and performance after cooling. It is a key equipment component used to produce TPU (thermoplastic polyurethane) car cover films. With the characteristics of high precision, high temperature resistance, wear resistance, and easy cleaning, the TPU car cover film die head will directly affect the quality and production efficiency of the product.

[0003] In the production of existing TPU car cover films, a die is needed to extrude the flowing molten plastic. In this process, the temperature control inside the die is very important. However, due to the poor insulation effect between the die body inside the die, the temperature of each part of the die cannot reach the optimal state, which significantly reduces the work efficiency. At the same time, due to the poor automatic fine-tuning ability of the die in the existing technology, manual intervention is often required, resulting in reduced thickness accuracy of the produced TPU car cover film, thereby reducing product quality. Summary of the invention

[0004] The purpose of the present invention is to provide an automatically adjustable TPU car cover film die head with a heat insulation device for existing devices, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatically adjustable TPU car cover film die head with a heat insulation device, comprising an upper mold body, a lower mold body is fixedly arranged below the upper mold body, a middle mold body 1 is fixedly arranged on one side of the upper mold body, a middle mold body 2 is fixedly arranged on one side of the lower mold body, and the middle mold body 1 is located directly above the middle mold body 2, a clamping block is clamped obliquely above the other side of the upper mold body, an automatic adjustment device is fixedly installed above the clamping block, and several groups of heat insulation devices are also installed between the four mold bodies of the upper mold body, the lower mold body, the middle mold body 1 and the middle mold body 2;

[0006] The automatic adjustment device comprises a shell, three screws are evenly arranged inside the shell, one end of each screw is provided with a fixing groove, the outer side of each fixing groove is sleeved with a group of fixing buckles, the lower surfaces of the three groups of fixing buckles are glued to the clamping block, each screw is threadedly connected with a worm wheel, one side of each worm wheel is meshedly connected with a worm, a shaft rod is passed through the center of the three worm wheels, one end of the shaft rod is connected with a coupling, the other end of the coupling is connected with the output end of the reduction motor, the reduction motor is sleeved with a motor sleeve, one side of the motor sleeve is welded to the inner side of the shell, and the other end of the shaft rod passes through one side of the shell;

[0007] Each group of the thermal insulation devices comprises an upper and lower aerogel insulation layer, a rubber powder polystyrene particle layer is tightly attached to the lower part of the upper aerogel insulation layer, a polystyrene foam layer is tightly attached to the lower part of the rubber powder polystyrene particle layer, an aluminum silicate fiber insulation layer is tightly attached to the lower part of the polystyrene foam layer, an expanded glass bead layer is tightly attached to the lower part of the aluminum silicate fiber insulation layer, and the lower part of the expanded glass bead layer is tightly attached to the lower part of the aerogel insulation layer.

[0008] The present invention further illustrates that rolling grooves are provided on the upper and lower sides of the worm wheel, an upper positioning plate is provided above the worm wheel, and a lower positioning plate is provided below the worm wheel, and balls are embedded and installed at the front ends of the upper positioning plate and the lower positioning plate and on the side opposite to the rolling grooves on both sides respectively, and the balls are rollingly connected to the rolling grooves, so that when the upper positioning plate and the lower positioning plate limit the upper and lower positions of the worm wheel, the balls contact the rolling grooves, which is used to convert sliding friction into rolling friction when the worm wheel rotates, thereby reducing friction, which is beneficial to limiting the worm wheel while reducing the impact on its rotation.

[0009] The present invention further describes that one end of the upper positioning plate and one end of the lower positioning plate are both welded to the inner side of the shell.

[0010] The present invention further describes that groove one and groove two are provided on the upper mold body, the front end of the clamping block is adapted to groove one and groove two, the clamping block is clamped to the upper mold body through groove one and groove two, and elastic pads are provided on both sides between groove one and the clamping block.

[0011] The present invention further describes that an upper layer flow channel is provided between the upper mold body and the middle mold body 1, a middle layer flow channel is provided between the middle mold body 1 and the middle mold body 2, a lower layer flow channel is provided between the middle mold body 2 and the lower mold body, and a composite flow channel is provided between the upper mold body and the lower mold body.

[0012] The present invention further describes that the thermal insulation device is divided into five groups, and the five groups of thermal insulation devices are respectively fixedly installed between the upper mold body and the middle mold body 1, between the middle mold body 1 and the middle mold body 2, between the middle mold body 2 and the lower mold body, one end of the middle mold body 1 close to the upper mold body, and one end of the middle mold body 2 close to the lower mold body.

[0013] The present invention further illustrates that the fixing buckle is formed by two identical assembly parts being glued relative to each other. During assembly, glue is first applied to the opposite sides of the two assembly parts, and the two assembly parts are assembled into the fixing buckle on the outside of the matching fixing grooves. After the gluing is completed, glue is applied to the bottom surface of the fixing buckle, and the fixing buckle is pasted on the designated position of the clamping block until the gluing is firm. The design of assembling two identical assembly parts into the fixing buckle is conducive to the installation and fixation of the screw.

[0014] The present invention further describes that the front ends of the middle mold body 1 and the middle mold body 2 are provided with constant temperature oil holes.

[0015] The present invention further describes that the automatic adjustment method of the automatic adjustment device comprises:

[0016] The film thickness data is monitored in real time by a thickness gauge and fed back to the control system. The control system controls the operation of the automatic adjustment device according to the data change, and sets the film thickness to be between a and b for the best product quality. When the film thickness monitored in real time by the thickness gauge is greater than b, the control system controls the output end of the reduction motor to rotate in the forward direction, and the reduction motor drives the worm to rotate through the connected shaft, and the worm drives the worm wheel meshing therewith to rotate clockwise. The rotation of the worm wheel pushes the threaded screw downward, and the screw thrust is set to F, and F decomposes into a vertical force F1 and a horizontal force F2. At this time, the elastic pad on the outside undergoes lateral elastic deformation to decompose the horizontal force F2, and the vertical force F1 will push the upper mold body downward through the clamping block, so that the gap between the upper mold body and the lower mold body becomes smaller, so that the upper and lower surfaces of the discharge port at the front end of the composite flow channel become closer, and the thickness of the extruded product becomes thinner until the film thickness of the product becomes thinner within the range of a to b.

[0017] When the thickness gauge monitors the film thickness in real time to be less than a, the control system controls the output end of the reduction motor to rotate in the opposite direction, and the reduction motor drives the worm to rotate through the connected shaft, and the worm drives the worm wheel meshing therewith to rotate counterclockwise, and the rotation of the worm wheel causes the threaded screw to pull upward with the fixing buckle as a fulcrum, and the screw thrust is set to F, and F is decomposed into a vertical force F1 and a horizontal force F2. At this time, the elastic pad on the inside undergoes lateral elastic deformation to decompose the horizontal force F2 and the vertical force F2. The force F1 will pull the upper mold body upward through the clamping block and the fixing buckle, so that the gap between the upper mold body and the lower mold body becomes larger, so that the distance between the upper and lower surfaces of the discharge port at the front end of the composite flow channel becomes farther, and the thickness of the extruded product becomes thicker until the film thickness of the product becomes thinner within the range of a to b, thereby achieving automatic adjustment to compensate for the size change between the mold bodies of the die head caused by thermal expansion and contraction due to temperature changes, resulting in the change of the distance between the upper and lower surfaces of the discharge port. The automatic adjustment function ensures the uniformity and consistency of the film thickness.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] (1) By providing the automatic adjustment device, the reduction motor is used as the power source, and the connected shaft drives the worm to rotate forward and reversely, and the worm drives the worm wheel meshing therewith to rotate clockwise and counterclockwise, so that the screw connected to the worm wheel thread drives the upper mold body to move downward and upward, thereby realizing the automatic fine-tuning function of the die head;

[0020] (2) The heat insulation device is provided, and the multi-layer insulation material composed of the aerogel insulation layer, the rubber powder polystyrene particle layer, the polystyrene foam layer, the aluminum silicate fiber insulation layer and the expanded glass bead layer is bonded and arranged in the die head, thereby enhancing the insulation effect between the mold bodies in the die head. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 Schematic diagram of the die head cross section of an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of an automatic adjustment portion of an embodiment of the present invention;

[0025] Figure 4 is an enlarged schematic diagram of the structure of region A of an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the heat insulation device of an embodiment of the present invention;

[0027] Figure 6 is an enlarged schematic diagram of the internal structure of the housing in region B of an embodiment of the present invention;

[0028] In the figure: 1. Automatic adjustment device; 100. Housing; 101. Screw; 102. Fixing groove; 103. Worm wheel; 104. Rolling groove; 105. Ball; 106. Worm; 107. Lower positioning plate; 108. Upper positioning plate; 109. Shaft; 110. Coupling; 111. Speed ​​reducer; 112. Motor sleeve; 2. Upper mold body; 21. Fixing buckle; 211. Assembly; 22. Slot 1; 23. Slot 2; 3. Thermal insulation device; 301. Aerogel insulation layer; 302. Rubber powder polystyrene particle layer; 303. Polystyrene foam layer; 304. Aluminum silicate fiber insulation layer; 305. Expanded vitrified microsphere layer; 4. Middle mold body 1; 5. Lower mold body; 6. Middle mold body 2; 7. Constant temperature oil hole; 8. Snap-in block; 81. Elastic pad; 9. Composite flow channel; 10. Upper flow channel; 11. Middle flow channel; 12. Lower flow channel. DETAILED DESCRIPTION

[0029] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] An embodiment of the present invention provides an automatically adjustable TPU car cover film die head with a heat insulation device, Figure 1 The die head of an embodiment of the present invention is a schematic cross-sectional view. The die head of the TPU car cover film with an automatic adjustment device and a heat insulation device comprises an upper die body 2, such as Figure 1 As shown, a lower mold body 5 is fixedly arranged below the upper mold body 2, a middle mold body 1 4 is fixedly arranged on one side of the upper mold body 2, a middle mold body 2 6 is fixedly arranged on one side of the lower mold body 5, and the middle mold body 1 4 is located directly above the middle mold body 2 6, and a clamping block 8 is clamped obliquely above the other side of the upper mold body 2, and an automatic adjustment device 1 is fixedly installed above the clamping block 8, and a plurality of groups of heat insulation devices 3 are also installed between the four mold bodies of the upper mold body 2, the lower mold body 5, the middle mold body 1 4 and the middle mold body 2 6.

[0031] Automatic adjustment device 1 Figures 1 to 3As shown, the automatic adjustment device 1 includes a housing 100, and three screws 101 are evenly arranged inside the housing 100. A fixing groove 102 is opened at one end of each screw 101, and a set of fixing buckles 21 are sleeved on the outer side of each fixing groove 102. The lower surfaces of the three sets of fixing buckles 21 are glued to the clamping block 8. A worm wheel 103 is threadedly connected to each screw 101, and a worm 106 is meshedly connected to one side of each worm wheel 103. A shaft 109 is passed through the center of the three worms 106. Figure 6 As shown, one end of the shaft 109 is connected to a coupling 110, and the other end of the coupling 110 is connected to the output end of the reduction motor 111. The reduction motor 111 is sleeved with a motor sleeve 112, one side of the motor sleeve 112 is welded to the inner side of the housing 100, and the other end of the shaft 109 passes through one side of the housing 100. When the reduction motor 111 is started, the shaft 109 is driven to rotate through the coupling 110, and the other end of the shaft 109 is supported by the housing 100 and rotates relative to the housing 100.

[0032] The structure of the heat insulation device 3 is as follows: Figure 5 As shown, each group of heat insulation device 3 includes two layers of aerogel insulation layer 301, a rubber powder polystyrene particle layer 302 is tightly attached to the bottom of the upper aerogel insulation layer 301, a polystyrene foam layer 303 is tightly attached to the bottom of the rubber powder polystyrene particle layer 302, an aluminum silicate fiber insulation layer 304 is tightly attached to the bottom of the polystyrene foam layer 303, an expanded glass microsphere layer 305 is tightly attached to the bottom of the aluminum silicate fiber insulation layer 304, and a lower aerogel insulation layer 301 is tightly attached to the bottom of the expanded glass microsphere layer 305. The heat insulation device 3 formed by tightly attaching multiple layers of insulation materials is arranged in the die head, which is conducive to strengthening the insulation effect between the mold bodies in the die head.

[0033] In certain preferred embodiments, Figure 3 As shown, rolling grooves 104 are provided on the upper and lower sides of the worm wheel 103, an upper positioning plate 108 is provided above the worm wheel 103, and a lower positioning plate 107 is provided below the worm wheel 103, and the front ends of the upper positioning plate 108 and the lower positioning plate 107 and the sides opposite to the rolling grooves 104 on both sides are embedded with balls 105, and the balls 105 are rollingly connected with the rolling grooves 104, so that when the upper positioning plate 108 and the lower positioning plate 107 limit the upper and lower positions of the worm wheel 103, the balls 105 contact with the rolling grooves 104, which is used to convert sliding friction into rolling friction when the worm wheel 103 rotates, thereby reducing friction, which is beneficial to limiting the worm wheel 103 while reducing the impact on its rotation.

[0034] In some preferred embodiments, one end of the upper positioning plate 108 and the lower positioning plate 107 are welded to the inner side of the outer shell 100, and the worm wheel 103 is fixed in a stationary state by the upper positioning plates 108 and the lower positioning plates 107 on the upper and lower sides, so that when the worm 106 engages with the worm wheel 103 and rotates, the screw 101 moves up and down relative to the worm wheel 103.

[0035] In certain preferred embodiments, Figure 4 As shown, the upper mold body 2 is provided with a groove 1 22 and a groove 23, the front end of the clamping block 8 is adapted to the groove 1 22 and the groove 23, the clamping block 8 is clamped on the upper mold body 2 through the groove 1 22 and the groove 23, and elastic pads 81 are provided on both sides between the groove 1 22 and the clamping block 8, and the elastic pads 81 can be made of highly elastic rubber with reversible deformation.

[0036] In certain preferred embodiments, Figure 1 As shown, an upper runner 10 is provided between the upper mold body 2 and the middle mold body 1 4, a middle runner 11 is provided between the middle mold body 1 4 and the middle mold body 2 6, a lower runner 12 is provided between the middle mold body 2 6 and the lower mold body 5, and a composite runner 9 is provided between the upper mold body 2 and the lower mold body 5. The upper runner 10, the middle runner 11 and the lower runner 12 accurately guide the molten plastic material from the injection molding machine to the die head in the mold, enter the composite runner 9 for compounding, and then extrude the TPU car cover film product from the discharge port at the front end of the composite runner 9.

[0037] In certain preferred embodiments, Figure 1 As shown, the heat insulation device 3 is divided into five groups, and the five groups of heat insulation devices 3 are respectively fixedly installed between the upper mold body 2 and the middle mold body 1 4, between the middle mold body 1 4 and the middle mold body 2 6, between the middle mold body 2 6 and the lower mold body 5, one end of the middle mold body 1 4 close to the upper mold body 2, and one end of the middle mold body 2 6 close to the lower mold body 5, so as to provide heat insulation between the mold bodies.

[0038] In certain preferred embodiments, the fixing buckle 21 is formed by two identical assembly parts 211 being glued relative to each other. During assembly, firstly, glue is applied to the opposite sides of the two assembly parts 211, and the two assembly parts 211 are assembled into the fixing buckle 21 on the outside of the matching fixing groove 102. After the gluing is completed, glue is applied to the bottom surface of the fixing buckle 21, and the fixing buckle 21 is pasted to the designated position on the clamping block 8 until it is firmly glued. The design of assembling two identical assembly parts 211 into the fixing buckle 21 is conducive to the installation and fixation of the screw 101.

[0039] In certain preferred embodiments, in certain preferred embodiments, as Figure 1As shown, a constant temperature oil hole 7 is provided at the front end of the middle mold body 1 4 and the middle mold body 2 6. The constant temperature oil hole 7 is connected to the internal oil circuit of the mold through a mold oil temperature thermostat, which can accurately control the temperature of the mold. The mold oil temperature thermostat can usually control the temperature within a very small error range, such as ±0.2°C, thereby ensuring that the mold maintains a stable temperature during use.

[0040] In the above embodiment, the automatic adjustment method of the automatic adjustment device 1 includes:

[0041] The film thickness data is monitored in real time by the thickness gauge and fed back to the control system. The control system controls the automatic adjustment device 1 to operate according to the data change, and sets the film thickness to be between a and b for the best product quality. When the film thickness monitored in real time by the thickness gauge is greater than b, the control system controls the output end of the reduction motor 111 to rotate in the forward direction, and the reduction motor 111 drives the worm 106 to rotate through the connected shaft 109, and the worm 106 drives the worm wheel 103 meshing therewith to rotate clockwise. The rotation of the worm wheel 103 pushes the threaded screw 101 downward, and the thrust of the screw 101 is set to F, and F decomposes the vertical force F1 and the horizontal force F2. At this time, the elastic pad 81 on the outside undergoes lateral elastic deformation to decompose the horizontal force F2, and the vertical force F1 will push the upper mold body 2 downward through the clamping block 8, so that the gap between the upper mold body 2 and the lower mold body 5 becomes smaller, so that the upper and lower distances of the discharge port at the front end of the composite flow channel 9 become closer, and the thickness of the extruded product becomes thinner until the film thickness of the product becomes thinner within the range of a to b.

[0042] When the thickness gauge monitors the film thickness in real time to be less than a, the control system controls the output end of the reduction motor 111 to rotate in the opposite direction. The reduction motor 111 drives the worm 106 to rotate through the connected shaft 109. The worm 106 drives the meshing worm wheel 103 to rotate counterclockwise. The rotation of the worm wheel 103 causes the threaded screw 101 to pull upward with the fixing buckle 21 as the fulcrum. The thrust of the screw 101 is set to F, and F is decomposed into a vertical force F1 and a horizontal force F2. At this time, the inner elastic pad 81 undergoes lateral elastic deformation to divide the horizontal force F2 into Solution: The vertical force F1 will pull the upper mold body 2 upward through the clamping block 8 and the fixing buckle 21, so that the gap between the upper mold body 2 and the lower mold body 5 becomes larger, so that the distance between the upper and lower surfaces of the discharge port at the front end of the composite flow channel 9 becomes farther, and the thickness of the extruded product becomes thicker until the film thickness of the product becomes thinner within the range of a to b, thereby achieving automatic adjustment to compensate for the size changes between the mold bodies of the die head caused by thermal expansion and contraction due to temperature changes, resulting in the change of the distance between the upper and lower surfaces of the discharge port. The automatic adjustment function ensures the uniformity and consistency of the film thickness.

[0043] The working principle of this embodiment is as follows: the molten plastic material is accurately guided from the injection molding machine to the die head in the mold through the upper flow channel 10, the middle flow channel 11 and the lower flow channel 12, enters the composite flow channel 9 for compounding, and then the TPU car cover film product is extruded from the discharge port at the front end of the composite flow channel 9. During the production process, the film thickness data is monitored in real time by a thickness gauge and fed back to the control system. The control system controls the operation of the automatic adjustment device 1 according to the data changes. When the monitored film thickness is too thick, the control system controls the output end of the reduction motor 111 to rotate forwardly. The reduction motor 111 drives the worm 106 to rotate through the connected shaft 109. The worm 106 drives the worm wheel 103 meshing therewith to rotate clockwise. The rotation of the worm wheel 103 pushes the threaded screw 101 downward. The thrust of the screw 101 is set to F, and F decomposes into a vertical force F1 and a horizontal force F2. At this time, the elastic pad 81 on the outside undergoes lateral elastic deformation to decompose the horizontal force F2. The vertical force F1 will push the upper mold body 2 downward through the clamping block 8, so that the gap between the upper mold body 2 and the lower mold body 5 becomes smaller, until the film thickness of the product becomes thinner and reaches a reasonable range. When the film thickness is monitored to be too thin, the control system controls the output end of the reduction motor 111 to rotate in the opposite direction. The reduction motor 111 drives the worm 106 to rotate through the connected shaft 109. The worm 106 drives the meshing worm wheel 103 to rotate counterclockwise. The rotation of the worm wheel 103 causes the threaded screw 101 to pull upward with the fixed buckle 21 as the fulcrum. The thrust of the screw 101 is set to F, and F decomposes the vertical force F1 and the horizontal force F2. At this time, the elastic pad 81 on the inside undergoes lateral elastic deformation to decompose the horizontal force F2. The vertical force F1 will pull the upper mold body 2 upward through the clamping block 8 and the fixed buckle 21, so that the gap between the upper mold body 2 and the lower mold body 5 becomes larger, until the product film thickness becomes thinner within a reasonable range, so as to compensate for the die size changes caused by temperature changes and ensure the uniformity and consistency of the film thickness. At the same time, the heat insulation device 3 is set between the mold bodies in the die head to improve the heat insulation function. Thereby achieving high-quality TPU car cover film production.

[0044] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0045] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatically adjustable TPU car cover film die head with a heat insulation device, comprising an upper die body (2), characterized in that: A lower mold body (5) is fixedly arranged below the upper mold body (2), a middle mold body (4) is fixedly arranged on one side of the upper mold body (2), a middle mold body (6) is fixedly arranged on one side of the lower mold body (5), and the middle mold body (4) is located directly above the middle mold body (6), a clamping block (8) is clamped obliquely above the other side of the upper mold body (2), and an automatic adjustment device (1) is fixedly installed above the clamping block (8), and a plurality of groups of heat insulation devices (3) are also installed between the four mold bodies of the upper mold body (2), the lower mold body (5), the middle mold body (4) and the middle mold body (6); The automatic adjustment device (1) comprises a housing (100), three screw rods (101) are evenly arranged inside the housing (100), one end of each screw rod (101) is provided with a fixing groove (102), the outer side of each fixing groove (102) is sleeved with a group of fixing buckles (21), the lower surfaces of the three groups of fixing buckles (21) are glued to the clamping block (8), each screw rod (101) is threadedly connected to a worm wheel (103), and one side of each worm wheel (103) is A worm (106) is meshedly connected, a shaft (109) is provided in the center of the three worms (106), one end of the shaft (109) is connected to a coupling (110), the other end of the coupling (110) is connected to the output end of a reduction motor (111), a motor sleeve (112) is sleeved on the reduction motor (111), one side of the motor sleeve (112) is welded to the inner side of the housing (100), and the other end of the shaft (109) passes through one side of the housing (100); Each group of the heat insulation device (3) comprises an upper and lower aerogel insulation layer (301); a rubber powder polystyrene particle layer (302) is tightly attached to the lower part of the upper aerogel insulation layer (301); a polystyrene foam layer (303) is tightly attached to the lower part of the rubber powder polystyrene particle layer (302); an aluminum silicate fiber insulation layer (304) is tightly attached to the lower part of the polystyrene foam layer (303); an expanded glass bead layer (305) is tightly attached to the lower part of the aluminum silicate fiber insulation layer (304); and the lower part of the aerogel insulation layer (301) is tightly attached to the lower part of the expanded glass bead layer (305); The worm wheel (103) is provided with rolling grooves (104) on both upper and lower sides, an upper positioning plate (108) is provided above the worm wheel (103), and a lower positioning plate (107) is provided below the worm wheel (103). The front ends of the upper positioning plate (108) and the lower positioning plate (107) and the sides respectively opposite to the rolling grooves (104) on both sides are embedded with balls (105), and the balls (105) are rollingly connected with the rolling grooves (104), so that when the upper positioning plate (108) and the lower positioning plate (107) limit the upper and lower positions of the worm wheel (103), the balls (105) contact with the rolling grooves (104), so as to convert sliding friction into rolling friction when the worm wheel (103) rotates, thereby reducing friction, which is beneficial to limiting the position of the worm wheel (103) and reducing the influence on its rotation; One end of the upper positioning plate (108) and one end of the lower positioning plate (107) are both welded to the inner side of the housing (100); The upper mold body (2) is provided with a groove 1 (22) and a groove 2 (23), the front end of the clamping block (8) is adapted to the groove 1 (22) and the groove 2 (23), the clamping block (8) is clamped to the upper mold body (2) through the groove 1 (22) and the groove 2 (23), and elastic pads (81) are provided on both sides between the groove 1 (22) and the clamping block (8); An upper flow channel (10) is provided between the upper mold body (2) and the middle mold body 1 (4), a middle flow channel (11) is provided between the middle mold body 1 (4) and the middle mold body 2 (6), a lower flow channel (12) is provided between the middle mold body 2 (6) and the lower mold body (5), and a composite flow channel (9) is provided between the upper mold body (2) and the lower mold body (5); The heat insulation device (3) is divided into five groups, and the five groups of the heat insulation device (3) are respectively fixedly installed between the upper mold body (2) and the middle mold body 1 (4), between the middle mold body 1 (4) and the middle mold body 2 (6), between the middle mold body 2 (6) and the lower mold body (5), one end of the middle mold body 1 (4) close to the upper mold body (2), and one end of the middle mold body 2 (6) close to the lower mold body (5); The fixing buckle (21) is formed by two identical assembly parts (211) being bonded together. When assembling, firstly, glue is applied to the opposite sides of the two assembly parts (211), and the two assembly parts (211) are assembled on the outer sides of the matching fixing grooves (102) to form the fixing buckle (21). After the bonding is completed, glue is applied to the bottom surface of the fixing buckle (21), and the fixing buckle (21) is bonded to a designated position on the clamping block (8) until the bonding is secure. The design of assembling the two identical assembly parts (211) to form the fixing buckle (21) is conducive to the installation and fixation of the screw rod (101); The front ends of the middle mold body 1 (4) and the middle mold body 2 (6) are provided with constant temperature oil holes (7).

2. According to the automatic adjustment TPU car cover film die head with a heat insulation device according to claim 1, the automatic adjustment method of the automatic adjustment device (1) comprises: The film thickness data is monitored in real time by a thickness gauge and fed back to a control system. The control system controls the automatic adjustment device (1) to operate according to the data changes, and sets the film thickness to a value between a and b for the best product quality. When the film thickness monitored in real time by the thickness gauge is greater than b, the control system controls the output end of the reduction motor (111) to rotate in the forward direction. The reduction motor (111) drives the worm (106) to rotate through the connected shaft (109). The worm (106) drives the worm wheel (103) meshing therewith to rotate clockwise. The rotation of the worm wheel (103) causes the threadedly connected screw to rotate clockwise. The rod (101) is pushed downward, and the thrust of the screw rod (101) is set to F, and F is decomposed into a vertical force F1 and a horizontal force F2. At this time, the elastic pad (81) on the outside undergoes lateral elastic deformation to decompose the horizontal force F2. The vertical force F1 pushes the upper mold body (2) downward through the clamping block (8), so that the gap between the upper mold body (2) and the lower mold body (5) becomes smaller, thereby shortening the distance between the upper and lower surfaces of the discharge port at the front end of the composite flow channel (9), and the thickness of the extruded product becomes thinner until the film thickness of the product becomes thinner and is within the range of a to b; When the thickness gauge monitors the film thickness in real time to be less than a, the control system controls the output end of the reduction motor (111) to rotate in the opposite direction, and the reduction motor (111) drives the worm (106) to rotate through the connected shaft (109), and the worm (106) drives the worm wheel (103) meshing therewith to rotate counterclockwise, and the rotation of the worm wheel (103) causes the threadedly connected screw (101) to be pulled upward with the fixing buckle (21) as a fulcrum, and the thrust of the screw (101) is set to F, and F is decomposed into a vertical force F1 and a horizontal force F2, and at this time, the inner elastic pad (81) undergoes lateral elastic deformation The horizontal force F2 is decomposed, and the vertical force F1 will pull the upper mold body (2) upward through the clamping block (8) and the fixing buckle (21), so that the gap between the upper mold body (2) and the lower mold body (5) becomes larger, thereby making the distance between the upper and lower surfaces of the discharge port at the front end of the composite flow channel (9) farther, and the thickness of the extruded product becomes thicker until the film thickness of the product becomes thinner within the range of a to b, thereby achieving automatic adjustment to compensate for the size change caused by thermal expansion and contraction between the mold bodies of the die head due to temperature changes, resulting in the change of the distance between the upper and lower surfaces of the discharge port. The automatic adjustment function ensures the uniformity and consistency of the film thickness.

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