A biaxial stretching device with uniform film thickness

Abstract

The present invention discloses a biaxial stretching device with uniform film thickness, which belongs to the technical field of film stretching, and comprises a driving device, on which two stretching devices are arranged, on which a plurality of clamping devices are arranged, the stretching device and the clamping device are used to clamp and stretch the film, and on which a uniform device is arranged, the uniform device is used to move the film being stretched, so as to prevent the film from being thin in the middle and thick on both sides during the stretching process. The driving device provided in the present invention can deliver the film to be biaxially stretched, and at the same time, the stretching device and the uniform device are synchronously driven by the same motor to operate, so that the stretching and uniform moving of the film are carried out synchronously, and the degree of automation is high; the stretching device provided in the present invention can drive a plurality of clamping devices to automatically clamp the side of the film, and clamp and biaxially stretch the film continuously heated by the heating tube through the track of the inclined track frame and the inclined clamping frame, so that the stretching is carried out continuously, and the stretching effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of film stretching, and in particular to a biaxial stretching device with uniform film thickness. Background Art

[0002] Film biaxial stretching is a specific film processing technology, which is mainly used to manufacture high-performance film materials. Biaxial stretching refers to the stretching of the film in two directions at the same time during the processing. This biaxial stretching can make the film material achieve uniform strength and ductility in mechanical properties, and improve its service life and durability. Under controlled temperature and stretching speed, the film material is stretched in two directions at the same time. Biaxially stretched films are widely used in food packaging, medical packaging and industrial packaging. These films are required to have excellent tear resistance, puncture strength and sealing performance. Film biaxial stretching is suitable for a variety of industrial and consumer product fields. By regulating the physical and chemical properties of the film, the specific needs of different applications can be met. Film stretching in the prior art mainly uses a clamping device to stretch the film biaxially, but the problem of thin film in the middle and thick film on both sides may occur during the stretching process. At the same time, there are many power sources and the control system is complex. Summary of the invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is: a biaxial stretching device with uniform film thickness, comprising a driving device, the driving device comprising a bottom plate, two stretching devices are arranged on the driving device, the stretching device comprises a transmission frame and a conveyor belt, the transmission frame is fixedly mounted on the bottom plate, a plurality of clamping devices are arranged on the stretching device, the clamping device comprises a clamping seat, the clamping seat is fixedly mounted on the conveyor belt, the stretching device and the clamping device are used to clamp and stretch the film, the driving device is provided with a uniform device, the uniform device comprises an upper uniform frame, the upper uniform frame is adjustably fixedly mounted on the bottom plate, the uniform device is used to move the film being stretched to prevent the film from being thin in the middle and thick on both sides during the stretching process, a heating box is arranged outside the driving device, and a plurality of heating tubes are arranged inside the heating box for heating the film being stretched.

[0004] Furthermore, the driving device includes an upper transmission shaft rotatably mounted on the heating box, a left bevel gear and a right bevel gear are fixedly mounted on the upper transmission shaft, the film is pulled in from the outside, a motor is fixedly mounted on the bottom plate, a motor wheel is fixedly mounted on the motor shaft of the motor, a motor bevel gear is fixedly mounted on the motor wheel, the motor bevel gear is meshed with the left bevel gear, a left transmission belt is wrapped around the outside of the motor wheel, a gear shaft is rotatably mounted on the top frame, a right upper bevel gear and a right wheel are fixedly mounted on the gear shaft, the right upper bevel gear is meshed with the right bevel gear, a right transmission belt is wrapped around the outside of the right wheel, and two transmission mechanisms are arranged on the bottom plate.

[0005] Furthermore, the transmission mechanism comprises a lower transmission wheel rotatably mounted on the bottom plate, an inner bevel gear is fixedly mounted on the lower transmission wheel, and an oblique transmission belt is wound around the upper transmission shaft and the lower transmission wheel.

[0006] When in use, the end of the film is pulled by the stretching device and the clamping device.

[0007] The rotation of the motor drives the motor wheel and the motor bevel gear to rotate, thereby driving the left bevel gear and the upper transmission shaft to rotate. At the same time, the upper transmission shaft drives the right bevel gear to rotate, thereby driving the upper right bevel gear, the gear shaft and the right wheel to rotate. The rotation directions of the right wheel and the motor wheel are opposite. The driving wheels of the stretching devices on both sides are driven to rotate through the left transmission belt and the right transmission belt respectively, and the two driving wheels rotate in opposite directions.

[0008] The rotation of the upper transmission shaft will also drive the lower transmission wheel to rotate through the oblique transmission belt, thereby driving the inner bevel gear to rotate, thereby driving the outer bevel gear to rotate, and the two outer bevel gears rotate in opposite directions.

[0009] Furthermore, the stretching device includes a driving wheel and a driven wheel rotatably mounted on a transmission frame, the driving wheel and the motor wheel on the motor wheel side are wrapped with a left transmission belt, the driving wheel and the right wheel of the stretching device on the upper transmission shaft side are wrapped with a right transmission belt, an oblique clamping frame and an oblique track frame are fixedly mounted on the bottom plate, an extension frame is fixedly mounted on the oblique track frame, and a conveyor belt is wrapped around the driving wheel and the driven wheel.

[0010] Furthermore, the oblique clamping frame and the oblique track frame are parallel and form a certain angle with the transmission frame. The oblique clamping frame and the oblique track frame are used to guide the clamping device to perform bidirectional stretching on the film.

[0011] The driving wheel rotates to drive the conveyor belt to move, thereby driving the clamping device to move continuously.

[0012] Furthermore, the clamping device includes an outer slide cylinder slidably mounted on the clamping seat, a slide column is fixedly mounted on the outer slide cylinder, an inner spring is arranged between the clamping seat and the outer slide cylinder, a clamping frame is fixedly mounted on the outer slide cylinder, a clamping slide column is slidably mounted on the clamping frame, a clamping plate is fixedly mounted on the clamping slide column, and a clamping spring is arranged between the clamping slide column and the clamping frame.

[0013] Furthermore, after the slide post contacts the extension frame, the slide post slides in the inclined track frame, a rounded corner is provided on the clamping slide post, and an arc surface is provided on the inclined clamping frame.

[0014] The heating tube in the heating box continuously generates heat to heat the film. When the conveyor belt moves with the clamping seat, when the slide column contacts the extension frame, the extension frame drives the outer slide cylinder to slide along the clamping seat, and the inner spring is stretched, so that the clamping frame and the clamping plate reach the top of the film side. When the clamping slide column contacts the oblique clamping frame, the oblique clamping frame drives the clamping slide column and the clamping plate to descend, and the clamping spring is compressed, and the film side is clamped by the clamping plate. Then the slide column enters the oblique track frame, and drives the clamping plate to move with the movement of the conveyor belt. The holding seat and the clamping frame move, the clamping slide column remains pressed down by the oblique clamping frame, the clamping plate maintains clamping the side of the film, the slide column moves along the track of the oblique track frame, and the film is bidirectionally stretched through the clamping plate. When the slide column leaves the oblique track frame, the clamping slide column is separated from the oblique clamping frame at the same time. At this time, the clamping spring rebounds, driving the clamping plate to release the film. At the same time, since the slide column leaves the oblique track frame, the inner spring rebounds, driving the outer slide cylinder to slide along the clamping seat in the direction away from the film and return to the initial position. At this time, the film stretching is completed and is sent out.

[0015] Furthermore, the uniformity device includes a plurality of passive rollers rotatably mounted on an upper uniformity frame, a lower uniformity frame is adjustably fixedly mounted on a bottom plate, a sensor is provided on the lower uniformity frame, a plurality of active rollers are rotatably mounted on the lower uniformity frame, a transmission shaft is fixedly mounted on the outermost active roller, an outer bevel gear is fixedly mounted on the transmission shaft, the outer bevel gear is meshed with the inner bevel gear, a roller transmission belt is wrapped around the outside of the active roller, the passive roller and the active roller are provided with a taper, the diameter gradually decreases from the direction of the driven wheel to the direction of the top frame, and the height of the upper and lower uniformity frames is adjustable.

[0016] The rotation of the outer bevel gear drives the transmission shaft to rotate, thereby driving each active roller to rotate through the roller transmission belt. The active roller pushes the film from the outside to the inside, and the passive roller plays an auxiliary pressing role. The distance between the passive roller and the active roller is the required thickness of the film. The clamping plate stretches the film outward to make the film stretch evenly, preventing the film from being thin in the middle and thick on both sides. At the same time, the sensor on the lower uniform frame detects the thickness uniformity of the film sent out of the heating box after stretching. When the unevenness is too large, the machine is stopped to adjust the position of the lower and upper uniform frames relative to the bottom plate.

[0017] Compared with the prior art, the present invention has the following advantages: (1) the driving device provided in the present invention can deliver the film to be biaxially stretched, and at the same time, the stretching device and the uniform device are synchronously driven by the same motor, so that the stretching and uniform movement of the film are carried out synchronously, and the degree of automation is high; (2) the stretching device provided in the present invention can drive a plurality of clamping devices to automatically clamp the side of the film, and clamp and biaxially stretch the film continuously heated by the heating tube through the track of the inclined track frame and the inclined clamping frame, so that the stretching is carried out continuously and the stretching effect is good; (3) the uniform device provided in the present invention can move the film inward during the biaxial stretching of the film to prevent the film from being thick on both sides and thin in the middle during the stretching process, and at the same time, the stretched film is monitored by the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention (without shell).

[0020] Figure 3 It is a schematic diagram of the overall structure of the present invention (interior).

[0021] Figure 4 The structure of the driving device of the present invention is shown in FIG. Figure 1 .

[0022] Figure 5 The structure of the driving device of the present invention is shown in FIG. Figure 2 .

[0023] Figure 6 The structure of the stretching device of the present invention is shown in FIG. Figure 1 .

[0024] Figure 7 The structure of the stretching device of the present invention is shown in FIG. Figure 2 .

[0025] Figure 8 The structure of the clamping device of the present invention is shown in FIG. Figure 1 .

[0026] Fig. 9 The structure of the clamping device of the present invention is shown in FIG. Figure 2 .

[0027] Fig.10 The structure of the uniform device of the present invention is shown in FIG. Figure 1 .

[0028] Fig.11 The structure of the uniform device of the present invention is shown in FIG. Figure 2 .

[0029] Fig.12The structure of the uniform device of the present invention is shown in FIG. Figure 3 .

[0030] Figure numbers: 101-bottom plate; 102-top frame; 103-right wheel; 104-film; 105-motor; 106-motor wheel; 107-left transmission belt; 108-motor bevel gear; 109-left bevel gear; 110-oblique transmission belt; 111-lower transmission wheel; 112-internal bevel gear; 113-right transmission belt; 114-right bevel gear; 115-upper right bevel gear; 116-gear shaft; 117-upper transmission shaft; 201-transmission frame; 202-driving wheel; 203-driven wheel; 2 04- conveyor belt; 205- oblique clamping frame; 206- oblique track frame; 207- extension frame; 301- clamping seat; 302- outer slide cylinder; 303- slide column; 304- clamping frame; 305- inner spring; 306- clamping plate; 307- clamping spring; 308- clamping slide column; 401- upper uniform frame; 402- roller drive belt; 403- passive roller; 404- lower uniform frame; 405- active roller; 406- transmission shaft; 407- outer bevel gear; 501- heating box; 502- heating tube. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Example: Reference Figure 1-Figure 12 A biaxial stretching device with uniform film thickness comprises a driving device, the driving device comprises a bottom plate 101, two stretching devices are arranged on the driving device, the stretching device comprises a transmission frame 201 and a conveyor belt 204, the transmission frame 201 is fixedly mounted on the bottom plate 101, a plurality of clamping devices are arranged on the stretching device, the clamping device comprises a clamping seat 301, the clamping seat 301 is fixedly mounted on the conveyor belt 204, the stretching device and the clamping device are used to clamp and stretch the film, a uniform device is arranged on the driving device, the uniform device comprises an upper uniform frame 401, the upper uniform frame 401 is adjustably fixedly mounted on the bottom plate 101, the uniform device is used to move the film being stretched to prevent the film from being thin in the middle and thick on both sides during the stretching process, a heating box 501 is arranged outside the driving device, and a plurality of heating tubes 502 are arranged inside the heating box 501 for heating the film being stretched.

[0033] like Figure 4 , Figure 5As shown, the driving device includes an upper transmission shaft 117 rotatably mounted on the heating box 501, and a left bevel gear 109 and a right bevel gear 114 are fixedly mounted on the upper transmission shaft 117. The film 104 is pulled in from the outside, and a motor 105 is fixedly mounted on the bottom plate 101. A motor wheel 106 is fixedly mounted on the motor shaft of the motor 105, and a motor bevel gear 108 is fixedly mounted on the motor wheel 106. The motor bevel gear 108 is meshed with the left bevel gear 109, and a left transmission belt 107 is wound around the motor wheel 106. A gear shaft 116 is rotatably mounted on the top frame 102, and an upper right bevel gear 115 and a right wheel 103 are fixedly mounted on the gear shaft 116. The upper right bevel gear 115 is meshed with the right bevel gear 114, and a right transmission belt 113 is wound around the right wheel 103. Two transmission mechanisms are arranged on the bottom plate 101.

[0034] like Figure 4 , Figure 5 As shown, the transmission mechanism includes a lower transmission wheel 111 rotatably mounted on the bottom plate 101 , an inner bevel gear 112 is fixedly mounted on the lower transmission wheel 111 , and an oblique transmission belt 110 is wound around the upper transmission shaft 117 and the lower transmission wheel 111 .

[0035] When in use, the end of the film 104 is pulled by the stretching device and the clamping device.

[0036] The rotation of motor 105 drives the motor wheel 106 and the motor bevel gear 108 to rotate, thereby driving the left bevel gear 109 and the upper transmission shaft 117 to rotate. At the same time, the upper transmission shaft 117 drives the right bevel gear 114 to rotate, thereby driving the upper right bevel gear 115, the gear shaft 116 and the right wheel 103 to rotate. The rotation directions of the right wheel 103 and the motor wheel 106 are opposite. The driving wheels 202 of the stretching device on both sides are driven to rotate through the left transmission belt 107 and the right transmission belt 113 respectively, and the two driving wheels 202 rotate in opposite directions.

[0037] The rotation of the upper transmission shaft 117 will also drive the lower transmission wheel 111 to rotate through the oblique transmission belt 110, thereby driving the inner bevel gear 112 to rotate, thereby driving the outer bevel gear 407 to rotate, and the two outer bevel gears 407 rotate in opposite directions.

[0038] like Figure 6 , Figure 7 As shown, the stretching device includes a driving wheel 202 and a driven wheel 203 rotatably mounted on a transmission frame 201, the driving wheel 202 and the motor wheel 106 on the motor wheel 106 side are wrapped with a left transmission belt 107, the driving wheel 202 and the right wheel 103 of the stretching device on the upper transmission shaft 117 side are wrapped with a right transmission belt 113, an oblique clamping frame 205 and an oblique track frame 206 are fixedly mounted on the bottom plate 101, an extension frame 207 is fixedly mounted on the oblique track frame 206, and a conveyor belt 204 is wrapped around the driving wheel 202 and the driven wheel 203.

[0039] like Figure 6 , Figure 7 As shown, the oblique clamping frame 205 and the oblique track frame 206 are parallel and form a certain angle with the transmission frame 201 . The oblique clamping frame 205 and the oblique track frame 206 are used to guide the clamping device to perform bidirectional stretching on the film 104 .

[0040] The driving wheel 202 rotates to drive the conveyor belt 204 to move, thereby driving the clamping device to move continuously.

[0041] like Figure 8 , Fig. 9 As shown, the clamping device includes an outer slide 302 slidably mounted on a clamping seat 301, a slide column 303 is fixedly mounted on the outer slide 302, an inner spring 305 is arranged between the clamping seat 301 and the outer slide 302, a clamping frame 304 is fixedly mounted on the outer slide 302, a clamping slide column 308 is slidably mounted on the clamping frame 304, a clamping plate 306 is fixedly mounted on the clamping slide column 308, and a clamping spring 307 is arranged between the clamping slide column 308 and the clamping frame 304.

[0042] like Figure 8 , Fig. 9 As shown, after the slide post 303 contacts the extension frame 207 , the slide post 303 slides in the inclined track frame 206 , the clamping slide post 308 is provided with a rounded corner, and the inclined clamping frame 205 is provided with an arc surface.

[0043] The heating tube 502 in the heating box 501 continuously generates heat to heat the film 104. When the conveyor belt 204 moves with the clamping seat 301, when the slide column 303 contacts the extension frame 207, under the action of the extension frame 207, the outer slide cylinder 302 is driven to slide along the clamping seat 301, and the inner spring 305 is stretched, so that the clamping frame 304 and the clamping plate 306 reach the top of the side of the film 104. When the clamping slide column 308 contacts the oblique clamping frame 205, under the action of the oblique clamping frame 205, the clamping slide column 308 and the clamping plate 306 are driven to descend, and the clamping spring 307 is compressed. The side of the film 104 is clamped by the clamping plate 306, and then the slide column 303 enters the oblique track frame 206. As the conveyor belt 204 moves with The movable clamping seat 301 and the clamping frame 304 move, the clamping slide post 308 remains pressed down by the oblique clamping frame 205, the clamping plate 306 maintains clamping the side of the film 104, and the slide post 303 moves along the track of the oblique track frame 206, and the film 104 is bidirectionally stretched through the clamping plate 306. When the slide post 303 leaves the oblique track frame 206, the clamping slide post 308 is separated from the oblique clamping frame 205 at the same time. At this time, the clamping spring 307 rebounds, driving the clamping plate 306 to release the film 104. At the same time, since the slide post 303 leaves the oblique track frame 206, the inner spring 305 rebounds, driving the outer slide cylinder 302 to slide along the clamping seat 301 in the direction away from the film 104 and return to the initial position. At this time, the film 104 is stretched and sent out.

[0044] like Figure 10-12 As shown, the uniform device includes a plurality of passive rollers 403 rotatably mounted on an upper uniform frame 401, a lower uniform frame 404 is adjustably fixedly mounted on the bottom plate 101, a sensor is arranged on the lower uniform frame 404, a plurality of active rollers 405 are rotatably mounted on the lower uniform frame 404, a transmission shaft 406 is fixedly mounted on the outermost active roller 405, an outer bevel gear 407 is fixedly mounted on the transmission shaft 406, the outer bevel gear 407 is meshed with the inner bevel gear 112, a roller transmission belt 402 is wound around the active roller 405, the passive roller 403 and the active roller 405 are provided with a taper, and the diameter gradually decreases from the direction of the driven wheel 203 to the direction of the top frame 102, and the height of the upper uniform frame 401 and the lower uniform frame 404 are adjustable.

[0045] The rotation of the outer bevel gear 407 drives the transmission shaft 406 to rotate, thereby driving each active roller 405 to rotate through the roller transmission belt 402. The active roller 405 pushes the film 104 from the outside to the inside, and the passive roller 403 plays an auxiliary pressing role. The distance between the passive roller 403 and the active roller 405 is the required thickness of the film. The film 104 is stretched outward by the clamping plate 306 to make the film 104 evenly stretched to prevent the film 104 from being thin in the middle and thick on both sides. At the same time, the sensor on the lower uniform frame 404 detects the thickness uniformity of the film 104 sent out of the heating box 501 after stretching. When the unevenness is too large, the machine is stopped to adjust the positions of the lower uniform frame 404 and the upper uniform frame 401 relative to the bottom plate 101.

[0046] The working principle of a biaxial stretching device with uniform film thickness disclosed in the present invention is as follows: the rotation of the motor 105 drives the motor wheel 106 and the motor bevel gear 108 to rotate, thereby driving the left bevel gear 109 and the upper transmission shaft 117 to rotate, and at the same time, the upper transmission shaft 117 drives the right bevel gear 114 to rotate, thereby driving the upper right bevel gear 115, the gear shaft 116 and the right wheel 103 to rotate, and the right wheel 103 and the motor wheel 106 rotate in opposite directions, respectively driving the driving wheels 202 of the stretching device on both sides to rotate through the left transmission belt 107 and the right transmission belt 113, and the two driving wheels 202 rotate in opposite directions. The rotation of the upper transmission shaft 117 will also drive the lower transmission wheel 111 to rotate through the oblique transmission belt 110, thereby driving the inner bevel gear 112 to rotate, thereby driving the outer bevel gear 407 to rotate, and the two outer bevel gears 407 rotate in opposite directions. The heating tube 502 in the heating box 501 continuously generates heat to heat the film 104. When the conveyor belt 204 moves with the clamping seat 301, when the slide column 303 contacts the extension frame 207, under the action of the extension frame 207, the outer slide cylinder 302 is driven to slide along the clamping seat 301, and the inner spring 305 is stretched, so that the clamping frame 304 and the clamping plate 306 reach the top of the side of the film 104. When the clamping slide column 308 contacts the oblique clamping frame 205, under the action of the oblique clamping frame 205, the clamping slide column 308 and the clamping plate 306 are driven to descend, and the clamping spring 307 is compressed. The side of the film 104 is clamped by the clamping plate 306, and then the slide column 303 enters the oblique track frame 206. As the conveyor belt 204 moves with The movable clamping seat 301 and the clamping frame 304 move, the clamping slide post 308 remains pressed down by the oblique clamping frame 205, the clamping plate 306 maintains clamping the side of the film 104, and the slide post 303 moves along the track of the oblique track frame 206, and the film 104 is bidirectionally stretched through the clamping plate 306. When the slide post 303 leaves the oblique track frame 206, the clamping slide post 308 is separated from the oblique clamping frame 205 at the same time. At this time, the clamping spring 307 rebounds, driving the clamping plate 306 to release the film 104. At the same time, since the slide post 303 leaves the oblique track frame 206, the inner spring 305 rebounds, driving the outer slide cylinder 302 to slide along the clamping seat 301 in the direction away from the film 104 and return to the initial position. At this time, the film 104 is stretched and sent out.The rotation of the outer bevel gear 407 drives the transmission shaft 406 to rotate, thereby driving each active roller 405 to rotate through the roller transmission belt 402. The active roller 405 pushes the film 104 from the outside to the inside, and the passive roller 403 plays an auxiliary pressing role. The distance between the passive roller 403 and the active roller 405 is the required thickness of the film. The film 104 is stretched outward by the clamping plate 306 to make the film 104 evenly stretched to prevent the film 104 from being thin in the middle and thick on both sides. At the same time, the sensor on the lower uniform frame 404 detects the thickness uniformity of the film 104 sent out of the heating box 501 after stretching. When the unevenness is too large, the machine is stopped to adjust the positions of the lower uniform frame 404 and the upper uniform frame 401 relative to the bottom plate 101.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A biaxial stretching device for uniform film thickness, comprising a driving device, characterized in that: The driving device comprises a bottom plate (101), and two stretching devices are arranged on the driving device. The stretching device comprises a transmission frame (201) and a conveyor belt (204), and the transmission frame (201) is fixedly mounted on the bottom plate (101). The stretching device is provided with a plurality of clamping devices, and the clamping devices comprise a clamping seat (301), and the clamping seat (301) is fixedly mounted on the conveyor belt (204). The stretching device and the clamping devices are used to clamp and stretch the film. The driving device is provided with a uniform device, and the uniform device comprises an upper uniform frame (401), and the upper uniform frame (401) is adjustably fixedly mounted on the bottom plate (101). The uniform device is used to move the film being stretched to prevent the film from being thin in the middle and thick on both sides during the stretching process. A heating box (501) is arranged outside the driving device, and a plurality of heating tubes (502) are arranged inside the heating box (501) to heat the film being stretched. The driving device comprises an upper transmission shaft (117) rotatably mounted on the heating box (501), a left bevel gear (109) and a right bevel gear (114) being fixedly mounted on the upper transmission shaft (117), the film (104) being pulled in from the outside, a motor (105) being fixedly mounted on the bottom plate (101), a motor wheel (106) being fixedly mounted on the motor shaft of the motor (105), a motor bevel gear (108) being fixedly mounted on the motor wheel (106), and the motor bevel gear (109) being fixedly mounted on the motor shaft of the motor (105). The wheel (108) is meshed with the left bevel gear (109), a left transmission belt (107) is wound around the motor wheel (106), a gear shaft (116) is rotatably mounted on the top frame (102), a right upper bevel gear (115) and a right wheel (103) are fixedly mounted on the gear shaft (116), the right upper bevel gear (115) is meshed with the right bevel gear (114), a right transmission belt (113) is wound around the right wheel (103), and two transmission mechanisms are arranged on the bottom plate (101); The transmission mechanism comprises a lower transmission wheel (111) rotatably mounted on the bottom plate (101), an inner bevel gear (112) being fixedly mounted on the lower transmission wheel (111), and an oblique transmission belt (110) being wound around the upper transmission shaft (117) and the lower transmission wheel (111); The motor (105) rotates to drive the motor wheel (106) and the motor bevel gear (108) to rotate, thereby driving the left bevel gear (109) and the upper transmission shaft (117) to rotate. At the same time, the upper transmission shaft (117) drives the right bevel gear (114) to rotate, thereby driving the upper right bevel gear (115), the gear shaft (116) and the right wheel (103) to rotate. The right wheel (103) and the motor wheel (106) rotate in opposite directions. The driving wheels (202) of the stretching devices on both sides are driven to rotate via the left transmission belt (107) and the right transmission belt (113). The two driving wheels (202) rotate in opposite directions. The rotation of the upper transmission shaft (117) also drives the lower transmission wheel (111) to rotate through the oblique transmission belt (110), thereby driving the inner bevel gear (112) to rotate, thereby driving the outer bevel gear (407) to rotate, and the two outer bevel gears (407) rotate in opposite directions; The stretching device comprises a driving wheel (202) and a driven wheel (203) rotatably mounted on a transmission frame (201); a left transmission belt (107) is wound around the driving wheel (202) and the motor wheel (106) on the motor wheel (106) side; a right transmission belt (113) is wound around the driving wheel (202) and the right wheel (103) of the stretching device on the upper transmission shaft (117) side; an oblique clamping frame (205) and an oblique track frame (206) are fixedly mounted on the bottom plate (101); a protruding frame (207) is fixedly mounted on the oblique track frame (206); and a conveyor belt (204) is wound around the driving wheel (202) and the driven wheel (203); The uniformizing device comprises a plurality of passive rollers (403) rotatably mounted on an upper uniformizing frame (401); a lower uniformizing frame (404) is adjustably fixedly mounted on a bottom plate (101); a sensor is arranged on the lower uniformizing frame (404); a plurality of active rollers (405) are rotatably mounted on the lower uniformizing frame (404); a transmission shaft (406) is fixedly mounted on the outermost active roller (405); an outer bevel gear (407) is fixedly mounted on the transmission shaft (406); the outer bevel gear (407) is meshed with an inner bevel gear (112); a roller transmission belt (402) is wound around the active roller (405); the passive roller (403) and the active roller (405) are provided with tapers, and the diameters gradually decrease from the direction of the driven wheel (203) to the direction of the top frame (102); and the heights of the upper uniformizing frame (401) and the lower uniformizing frame (404) are adjustable.

2. The biaxial stretching device for uniform film thickness according to claim 1, characterized in that: The oblique clamping frame (205) and the oblique track frame (206) are parallel and form a certain angle with the transmission frame (201). The oblique clamping frame (205) and the oblique track frame (206) are used to guide the clamping device to perform bidirectional stretching on the film (104).

3. The biaxial stretching device for uniform film thickness according to claim 1, characterized in that: The clamping device comprises an outer slide cylinder (302) slidably mounted on a clamping seat (301), a slide column (303) fixedly mounted on the outer slide cylinder (302), an inner spring (305) arranged between the clamping seat (301) and the outer slide cylinder (302), a clamping frame (304) fixedly mounted on the outer slide cylinder (302), a clamping slide column (308) slidably mounted on the clamping frame (304), a clamping plate (306) fixedly mounted on the clamping slide column (308), and a clamping spring (307) arranged between the clamping slide column (308) and the clamping frame (304).

4. The biaxial stretching device for uniform film thickness according to claim 3, characterized in that: After the slide post (303) contacts the extension frame (207), the slide post (303) slides in the inclined track frame (206), a rounded corner is provided on the clamping slide post (308), and an arc surface is provided on the inclined clamping frame (205).

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