A stretching and orienting device for polypropylene film production

Abstract

The application relates to the technical field of film preparation, in particular to a stretching and orienting device for polypropylene film preparation, which comprises a base, a feeding roller, a receiving roller, a machine body, a transmission box, a feeding tank, a feeding pipe, a sprayer, a rotating frame, a control console, a stretching mechanism, an adjusting mechanism and a rotating mechanism. The device realizes oblique stretching of the film through the stretching mechanism, the film can be subjected to transverse stress for water flow, the film can be conveniently stretched transversely, the adjusting mechanism is used for adjusting the longitudinal and transverse stretching ratio of the film, part of the device can adjust the transverse stretching degree of the film according to preparation requirements, the film with a large width can be conveniently prepared, the rotating mechanism is used for realizing rotation of the sprayer, the spraying range of part of the device can be adjusted according to the film width, a large amount of cooling liquid is saved, and the efficiency, energy saving property and adjustability of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of thin film preparation technology, specifically to a stretching and orientation apparatus for preparing polypropylene films. Background Technology

[0002] Bis-axially oriented polypropylene (BEP) film is generally a multi-layer co-extruded film, produced by co-extruded polypropylene granules into sheets, followed by stretching in both longitudinal and transverse directions. Due to the oriented molecular structure during stretching, this type of film exhibits good physical stability, mechanical strength, and airtightness, as well as high transparency and gloss. It is also tough and wear-resistant, making it a widely used printing film. The typical thickness is 20–40 μm, with 20 μm being the most common. The main drawback of BEP film is its poor heat-sealing properties. Therefore, it is generally used as the outer layer of composite films. For example, when laminated with polyethylene film, it offers ideal moisture resistance, transparency, strength, stiffness, and printability, making it suitable for packaging dry foods.

[0003] Existing devices primarily perform biaxial stretching of films through a transverse stretching mechanism and a longitudinal stretching mechanism. Many existing technologies are similar to biaxial hybrid stretching devices and methods for films. The structure of patent number CN114228122A includes a support, two annular tracks, and two transmission chain clamps. Compared to the traditional synchronous stretching method, a pre-transverse stretching step is added before the synchronous stretching step. In the high-temperature environment of the oven, the film heated to the process temperature is first subjected to a small-amplitude transverse stretching, allowing the track mechanism to generate sufficient and stable transverse stretching force on the film before initiating longitudinal stretching. This ensures that the film ultimately reaches the required stretching ratio in both the transverse and longitudinal directions. This effectively solves the existing defects of synchronous film stretching technology, alleviates deformation caused by differences in physical properties between the sides and the center of the film, greatly improves the film stretching quality, and avoids bow-shaped defects in the film. Therefore, it has broader application prospects for the production of high-value-added film materials. However, there are still areas for optimization in this device.

[0004] Existing devices primarily use a ring track and transmission chain clamps to laterally stretch the film. This makes it difficult for some devices to stably clamp the sides of the fluidized film, thus hindering lateral stretching. Secondly, some devices employ fixed-specification lateral stretching structures, making it difficult to adjust the lateral stretching degree of the film according to preparation requirements, thus limiting the production of wide films. Finally, some devices require spraying coolant to cure the stretched film, making it difficult to adjust the spraying range according to the film width, resulting in significant coolant waste and reduced device efficiency and practicality. Therefore, to address these issues, a stretching and orientation device for polypropylene film preparation is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a stretching and orientation apparatus for preparing polypropylene films, addressing the problems mentioned in the background art. Existing apparatuses primarily use a ring track and transmission chain clamp to stretch the film laterally, making it difficult for some apparatuses to stably clamp the sides of the fluidized film, thus hindering lateral stretching. Secondly, some apparatuses employ fixed-specification lateral stretching structures, making it difficult to adjust the lateral stretching degree of the film according to preparation requirements, thus making it difficult to prepare films with large widths. Finally, some apparatuses require spraying coolant to cure the stretched film, making it difficult to adjust the spraying range according to the film width, resulting in a significant waste of coolant.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stretching and oriented device for preparing polypropylene film, comprising a base, a feeding roller fixedly connected to the top right side of the base, a receiving roller fixedly connected to the top left side of the base, an organism fixedly connected to the top middle of the base, a transmission box fixedly connected to the bottom right side of the organism, a feeding box fixedly connected to the bottom left side of the organism, a conveying pipe fixedly connected to the top of the feeding box, the top end of the conveying pipe passing through the organism and movably connected to a sprayer, two sets of rotating frames provided inside the right side of the organism, and a control console fixedly connected to the middle of the surface of the organism;

[0007] The transmission box is equipped with a tensioning mechanism, which includes a first motor. The right side of the first motor is fixedly connected to the middle left side of the transmission box. The right side of the machine body is equipped with an adjustment mechanism, which includes a second motor. The bottom of the second motor is fixedly connected to the middle top of the machine body. The left side of the machine body is equipped with a rotating mechanism, which includes a linkage worm gear. The two ends of the linkage worm gear are movably connected to the left side of the machine body.

[0008] Preferably, a transmission worm is fixedly connected to the middle right side of the first motor, the right end of the transmission worm is movably connected to the right side of the inner wall of the transmission box, transmission worm wheels are meshed on both sides of the outer wall of the transmission worm, a transmission shaft is fixedly connected to the inner wall of the transmission worm wheel, the bottom end of the transmission shaft is movably connected to the bottom of the inner wall of the transmission box, and the top end of the transmission shaft passes through the machine body and is fixedly connected to a first bevel gear.

[0009] Preferably, a second bevel gear is meshed with the upper part of the first bevel gear, a first rotating rod is fixedly connected to the middle of the outer side of the second bevel gear, the left end of the first rotating rod passes through the lower part of the rotating frame and is fixedly connected to the main gear, and a lower support roller is fixedly connected to the outer wall of the first rotating rod inside the rotating frame.

[0010] Preferably, a secondary gear is meshed above the main gear, a second rotating rod is fixedly connected to the middle right side of the secondary gear, the right end of the second rotating rod is movably connected to the upper inner wall of the rotating frame, and a lower pressure roller is fixedly connected to the outer wall of the second rotating rod inside the rotating frame.

[0011] Preferably, a movable shaft is fixedly connected to the bottom center of the second motor, the bottom end of the movable shaft passes through the machine body and is fixedly connected to a third bevel gear, a fourth bevel gear is meshed with the bottom of the third bevel gear, an adjusting screw is fixedly connected to the inner wall of the fourth bevel gear, and the two ends of the adjusting screw are movably connected to the middle of the inner wall of the machine body.

[0012] Preferably, an adjusting sleeve is threaded to the right side of the outer wall of the adjusting screw, and traction rods are movably connected to both sides of the outer wall of the adjusting sleeve. The other end of the traction rod is movably connected to the top outer side of the rotating frame.

[0013] Preferably, a limiting sleeve is fixedly connected to the bottom center of the rotating frame, and a limiting arc frame is fitted on the inner wall of the limiting sleeve. The bottom of the limiting arc frame is fixedly connected to the bottom of the inner wall of the machine body.

[0014] Preferably, a drive wheel is fixedly connected to the left side of the outer wall of the adjusting screw, a linkage belt is engaged with the outer wall of the drive wheel, a driven wheel is engaged with the inner wall of the linkage belt, and the inner wall of the driven wheel is fixedly connected to the left side of the outer wall of the linkage worm.

[0015] Preferably, a worm gear is meshed with the outer right side of the linkage worm, a rotating shaft is fixedly connected to the inner wall of the linkage worm, the top end of the rotating shaft is movably connected to the top of the inner wall of the machine body, and a rotating gear is fixedly connected to the bottom end of the rotating shaft.

[0016] Preferably, the outer wall of the rotating gear is meshed with an inner rotating gear, and the bottom of the inner rotating gear is fixedly connected to the top center of the sprayer.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention utilizes a stretching mechanism comprising a first motor, a transmission worm, a transmission worm wheel, a transmission shaft, a first bevel gear, a second bevel gear, a first rotating rod, a main gear, a lower support roller, a secondary gear, a second rotating rod, and a lower pressure roller. The first motor, activated by a control console, drives the transmission worm to rotate in a limited position. The transmission worm meshes with the transmission worm wheel, transmission shaft, and first bevel gear, which then mesh with the second bevel gear, first rotating rod, main gear, and lower support roller, which in turn rotate in a limited position. The main gear meshes with the secondary gear, second rotating rod, and lower pressure roller, which in turn rotate in a limited position. The inclined lower support roller and lower pressure roller perform oblique stretching of the supplied film, achieving oblique stretching of the film. This allows for lateral force application to the flowing film in parts of the device, facilitating lateral stretching and improving the efficiency and practicality of the device.

[0019] 2. This invention, through the adjustment mechanism including a second motor, a movable shaft, a third bevel gear, a fourth bevel gear, an adjusting screw, an adjusting sleeve, a traction rod, a limiting sleeve, and a limiting arc frame, uses a control console to start the second motor, which drives the movable shaft and the third bevel gear to rotate synchronously. The third bevel gear meshes and drives the fourth bevel gear and the adjusting screw to rotate in a limited position. The adjusting screw drives the adjusting sleeve to slide left and right, and the adjusting sleeve drives one end of the traction rod to slide synchronously. This causes the other end of the traction rod to drive the rotating frame and the limiting sleeve to rotate along the limiting arc frame, thereby changing the longitudinal and transverse conveying ratio between the lower support roller and the lower pressure roller. This achieves the adjustment of the longitudinal and transverse stretching ratio of the film, allowing some devices to adjust the transverse stretching of the film according to the preparation requirements, facilitating the preparation of films with larger widths and improving the adjustability and practicality of the device.

[0020] 3. This invention utilizes a rotating mechanism comprising a driving wheel, a linkage belt, a driven wheel, a linkage worm, a linkage worm wheel, a rotating shaft, a rotating gear, and a rotating internal gear. An adjusting screw drives the driving wheel to rotate synchronously; the driving wheel engages and drives the linkage belt to rotate; the linkage belt engages and drives the driven wheel to rotate synchronously; the driven wheel drives the linkage worm to rotate to a limit position; the linkage worm engages and drives the linkage worm wheel to rotate; the linkage worm wheel drives the rotating shaft to rotate to a limit position; the rotating shaft drives the rotating gear to rotate synchronously; and the rotating gear engages and drives the rotating internal gear and the sprayer to rotate to a limit position. This achieves the rotation of the sprayer, allowing the spray range of some devices to be adjusted according to the film width, saving a significant amount of coolant and improving the energy efficiency and practicality of the device. Attached Figure Description

[0021] Figure 1 This is a front side perspective view of the structure of the present invention;

[0022] Figure 2 This is a frontal cross-sectional perspective view of the structure of the present invention;

[0023] Figure 3This is a front sectional perspective view of a portion of the transmission box and tensioning mechanism of the present invention;

[0024] Figure 4 This is a partial side cross-sectional perspective view of the rotating frame and tensioning mechanism of the present invention;

[0025] Figure 5 This is a frontal cross-sectional perspective view of a portion of the body and adjustment mechanism of the present invention;

[0026] Figure 6 This is a bottom-view sectional perspective view of a portion of the body and rotating mechanism of the present invention;

[0027] Figure 7 This is a frontal sectional perspective view of a portion of the body and rotating mechanism of the present invention.

[0028] In the diagram: 101, base; 102, feeding roller; 103, receiving roller; 104, machine body; 105, transmission box; 106, feeding box; 107, conveying pipe; 108, sprayer; 109, rotating frame; 110, control console; 2, tensioning mechanism; 201, first motor; 202, transmission worm gear; 203, transmission worm wheel; 204, transmission shaft; 205, first bevel gear; 206, second bevel gear; 207, first rotating rod; 208, main gear; 209, lower support roller; 210, auxiliary gear; 211 1. Second rotating rod; 2.12. Lower pressure roller; 3. Adjusting mechanism; 301. Second motor; 302. Movable shaft; 303. Third bevel gear; 304. Fourth bevel gear; 305. Adjusting screw; 306. Adjusting screw sleeve; 307. Traction rod; 308. Limiting sleeve; 309. Limiting arc frame; 4. Rotating mechanism; 401. Driving wheel; 402. Linkage belt; 403. Driven wheel; 404. Linkage worm gear; 405. Linkage worm wheel; 406. Rotating shaft; 407. Rotating gear; 408. Rotating internal gear. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-7 One embodiment provided by the present invention:

[0031] A stretching and oriented device for preparing polypropylene film includes a base 101, a feeding roller 102 fixedly connected to the top right side of the base 101, a receiving roller 103 fixedly connected to the top left side of the base 101, a body 104 fixedly connected to the top middle of the base 101, a transmission box 105 fixedly connected to the bottom right side of the body 104, a feeding box 106 fixedly connected to the bottom left side of the body 104, a conveying pipe 107 fixedly connected to the top of the feeding box 106, the top end of the conveying pipe 107 passing through the body 104 and movably connected to a sprayer 108, two sets of rotating frames 109 provided inside the right side of the body 104, and a control console 110 fixedly connected to the middle of the surface of the body 104.

[0032] The transmission box 105 is equipped with a tensioning mechanism 2, which includes a first motor 201. The right side of the first motor 201 is fixedly connected to the middle left side of the transmission box 105. A transmission worm 202 is fixedly connected to the middle right side of the first motor 201. The right end of the transmission worm 202 is movably connected to the right side of the inner wall of the transmission box 105. Transmission worm gears 203 are meshed on both sides of the outer wall of the transmission worm 202. A transmission shaft 204 is fixedly connected to the inner wall of the transmission worm gear 203. The bottom end of the transmission shaft 204 is movably connected to the bottom of the inner wall of the transmission box 105. The top end of the transmission shaft 204 passes through the body 104 and is fixedly connected to a first bevel gear 205. Through this design, the first motor 201 drives the transmission worm 202 to rotate in a limited position, so that the transmission worm gear 203 drives the transmission shaft 204 and the first bevel gear 205 to rotate synchronously. A second bevel gear 205 is meshed on the top of the first bevel gear 205. The first rotating rod 207 is fixedly connected to the middle of the outer side of the second bevel gear 206. The left end of the first rotating rod 207 passes through the lower part of the rotating frame 109 and is fixedly connected to the main gear 208. The outer wall of the first rotating rod 207 is located inside the rotating frame 109 and is fixedly connected to the lower roller 209. Through this design, the second bevel gear 206 drives the first rotating rod 207, the main gear 208 and the lower roller 209 to rotate synchronously. The upper part of the main gear 208 is meshed with the secondary gear 210. The middle right side of the secondary gear 210 is fixedly connected to the second rotating rod 211. The right end of the second rotating rod 211 is movably connected to the upper part of the inner wall of the rotating frame 109. The outer wall of the second rotating rod 211 is located inside the rotating frame 109 and is fixedly connected to the lower pressure roller 212. Through this design, the secondary gear 210 drives the second rotating rod 211 and the lower pressure roller 212 to rotate synchronously.

[0033] An adjustment mechanism 3 is located on the right side of the interior of the body 104. The adjustment mechanism 3 includes a second motor 301. The bottom of the second motor 301 is fixedly connected to the middle of the top of the body 104. A movable shaft 302 is fixedly connected to the middle of the bottom of the second motor 301. The bottom end of the movable shaft 302 passes through the body 104 and is fixedly connected to a third bevel gear 303. A fourth bevel gear 304 is meshed with the bottom of the third bevel gear 303. An adjustment screw 305 is fixedly connected to the inner wall of the fourth bevel gear 304. The two ends of the adjustment screw 305 are movably connected to the middle of the inner wall of the body 104. Through this design, the second motor 301 drives the adjustment screw 305 to a limited position. The adjusting screw 305 is threaded to the right side of its outer wall, and an adjusting sleeve 306 is threaded to the adjusting screw 305. The adjusting sleeve 306 is movably connected to both sides of its outer wall, and the other end of the traction rod 307 is movably connected to the top outer side of the rotating frame 109. Through this design, the traction rod 307 drives the rotating frame 109 to rotate in a limited position. A limiting sleeve 308 is fixedly connected to the bottom middle of the rotating frame 109. A limiting arc frame 309 is fitted on the inner wall of the limiting sleeve 308. The bottom of the limiting arc frame 309 is fixedly connected to the bottom of the inner wall of the machine body 104. Through this design, the rotating frame 109 drives the limiting sleeve 308 to slide in a limited position on the outer wall of the limiting arc frame 309.

[0034] A rotating mechanism 4 is located on the left side of the interior of the machine body 104. The rotating mechanism 4 includes a linkage worm gear 404, with both ends of the linkage worm gear 404 movably connected to the left side of the interior of the machine body 104. A driving wheel 401 is fixedly connected to the left side of the outer wall of the adjusting screw 305. A linkage belt 402 is meshed with the outer wall of the driving wheel 401. A driven wheel 403 is meshed with the inner wall of the linkage belt 402. The inner wall of the driven wheel 403 is fixedly connected to the left side of the outer wall of the linkage worm gear 404. Through this design, the adjusting screw 305 drives the linkage worm gear 404 to rotate synchronously, so that the adjusting mechanism 3 is linked to the rotating mechanism 4. The right side of the outer wall of the linkage worm gear 404 is also connected to the rotating mechanism 4. A worm gear 405 is meshed with the sprayer 108. A rotating shaft 406 is fixedly connected to the inner wall of the worm gear 405. The top end of the rotating shaft 406 is movably connected to the top of the inner wall of the machine body 104. A rotating gear 407 is fixedly connected to the bottom end of the rotating shaft 406. Through this design, the worm gear 405 drives the rotating shaft 406 and the rotating gear 407 to rotate in a limited position. An internal rotating gear 408 is meshed with the outer wall of the rotating gear 407. The bottom of the internal rotating gear 408 is fixedly connected to the top center of the sprayer 108. Through this design, the rotating gear 407 meshes with the internal rotating gear 408 and the sprayer 108 to rotate in a limited position.

[0035] Working principle: When the film needs to be stretched at an angle, the first motor 201 is started by the control console 110. The first motor 201 drives the transmission worm gear 202 to rotate in a limited position. The transmission worm gear 202 meshes with and drives the transmission worm wheel 203 to rotate synchronously. The transmission worm wheel 203 drives the transmission shaft 204 to rotate in a limited position. The transmission shaft 204 drives the first bevel gear 205 to rotate synchronously. The first bevel gear 205 meshes with and drives the second bevel gear 206 to rotate. The second bevel gear 206 drives the first rotating rod 207 to rotate in a limited position. The first rotating rod 207 drives the main gear 208 and the lower support roller 209 to rotate in a limited position. The main gear 208 meshes with and drives the secondary gear 210 to rotate. The secondary gear 210 drives the second rotating rod 211 and the lower pressure roller 212 to rotate in a limited position. The inclined lower support roller 209 and the lower pressure roller 212 stretch the supplied film at an angle, thus realizing the inclined stretching operation of the film.

[0036] When it is necessary to adjust the longitudinal and transverse stretch ratio of the film, the second motor 301 is first started through the control console 110. The second motor 301 drives the movable shaft 302 to rotate in a limited position. The movable shaft 302 drives the third bevel gear 303 to rotate synchronously. The third bevel gear 303 meshes and drives the fourth bevel gear 304 to rotate. The fourth bevel gear 304 drives the adjusting screw 305 to rotate in a limited position. The adjusting screw 305 drives the adjusting sleeve 306 to slide left and right. The adjusting sleeve 306 drives one end of the traction rod 307 to slide synchronously, so that the other end of the traction rod 307 drives the rotating frame 109 and the limiting sleeve 308 to rotate in a limited position along the limiting arc frame 309. This changes the longitudinal and transverse conveying rate between the lower support roller 209 and the lower pressure roller 212, thus realizing the adjustment operation of the longitudinal and transverse stretch ratio of the film.

[0037] When the sprayer 108 needs to be rotated, the adjusting screw 305 first drives the driving wheel 401 to rotate synchronously. The driving wheel 401 engages and drives the linkage belt 402 to rotate. The linkage belt 402 engages and drives the driven wheel 403 to rotate synchronously. The driven wheel 403 drives the linkage worm gear 404 to rotate to a limit position. The linkage worm gear 404 engages and drives the linkage worm wheel 405 to rotate. The linkage worm wheel 405 drives the rotating shaft 406 to rotate to a limit position. The rotating shaft 406 drives the rotating gear 407 to rotate synchronously. The rotating gear 407 engages and drives the rotating internal gear 408 and the sprayer 108 to rotate to a limit position, thus realizing the rotation operation of the sprayer 108. The operation ends here.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A stretching and aligning apparatus for preparing polypropylene film, comprising a base (101), characterized in that: A feeding roller (102) is fixedly connected to the top right side of the base (101), a receiving roller (103) is fixedly connected to the top left side of the base (101), a body (104) is fixedly connected to the top middle of the base (101), a transmission box (105) is fixedly connected to the bottom right side of the body (104), a feeding box (106) is fixedly connected to the bottom left side of the body (104), a conveying pipe (107) is fixedly connected to the top of the feeding box (106), the top end of the conveying pipe (107) passes through the body (104) and is movably connected to a sprayer (108), two sets of rotating frames (109) are provided on the inside right side of the body (104), and a control console (110) is fixedly connected to the center of the surface of the body (104). The transmission box (105) is provided with a tensioning mechanism (2) inside. The tensioning mechanism (2) includes a first motor (201). The right side of the first motor (201) is fixedly connected to the middle left side of the transmission box (105). The machine body (104) is provided with an adjustment mechanism (3) inside the right side. The adjustment mechanism (3) includes a second motor (301). The bottom of the second motor (301) is fixedly connected to the middle top of the machine body (104). The machine body (104) is provided with a rotating mechanism (4) inside the left side. The rotating mechanism (4) includes a linkage worm gear (404). The two ends of the linkage worm gear (404) are movably connected to the left side inside the machine body (104). A movable shaft (302) is fixedly connected to the bottom center of the second motor (301). The bottom end of the movable shaft (302) passes through the machine body (104) and is fixedly connected to a third bevel gear (303). A fourth bevel gear (304) is meshed with the lower part of the third bevel gear (303). An adjusting screw (305) is fixedly connected to the inner wall of the fourth bevel gear (304). The two ends of the adjusting screw (305) are movably connected to the middle of the inner wall of the machine body (104). 05) has an adjusting sleeve (306) threaded on the right side of the outer wall. The adjusting sleeve (306) has movably connected traction rods (307) on both sides of the outer wall. The other end of the traction rods (307) is movably connected to the top outside of the rotating frame (109). The bottom middle of the rotating frame (109) is fixedly connected to a limiting sleeve (308). The inner wall of the limiting sleeve (308) is fitted with a limiting arc frame (309). The bottom of the limiting arc frame (309) is fixedly connected to the bottom of the inner wall of the machine body (104). The adjusting screw (305) is fixedly connected to the left side of the outer wall of the drive wheel (401), the outer wall of the drive wheel (401) is meshed with the linkage belt (402), the inner wall of the linkage belt (402) is meshed with the driven wheel (403), the inner wall of the driven wheel (403) is fixedly connected to the left side of the outer wall of the linkage worm (404), the outer wall of the linkage worm (404) is meshed with the linkage worm wheel (405), the inner wall of the linkage worm wheel (405) is fixedly connected with the rotating shaft (406), the top end of the rotating shaft (406) is movably connected to the top of the inner wall of the machine body (104), the bottom end of the rotating shaft (406) is fixedly connected with the rotating gear (407), the outer wall of the rotating gear (407) is meshed with the rotating internal gear (408), and the bottom of the rotating internal gear (408) is fixedly connected to the top middle of the sprayer (108).

2. The stretching and aligning apparatus for preparing polypropylene film according to claim 1, characterized in that: A transmission worm gear (202) is fixedly connected to the middle right side of the first motor (201). The right end of the transmission worm gear (202) is movably connected to the right side of the inner wall of the transmission box (105). Transmission worm wheels (203) are meshed on both sides of the outer wall of the transmission worm gear (202). A transmission shaft (204) is fixedly connected to the inner wall of the transmission worm wheel (203). The bottom end of the transmission shaft (204) is movably connected to the bottom of the inner wall of the transmission box (105). The top end of the transmission shaft (204) passes through the machine body (104) and is fixedly connected to a first bevel gear (205).

3. The stretching and aligning apparatus for preparing polypropylene film according to claim 2, characterized in that: The first bevel gear (205) is meshed with the second bevel gear (206) above. The outer middle part of the second bevel gear (206) is fixedly connected to the first rotating rod (207). The left end of the first rotating rod (207) passes through the bottom of the rotating frame (109) and is fixedly connected to the main gear (208). The outer wall of the first rotating rod (207) is located inside the rotating frame (109) and is fixedly connected to the lower roller (209).

4. The stretching and aligning apparatus for preparing polypropylene film according to claim 3, characterized in that: A secondary gear (210) is meshed above the main gear (208). A second rotating rod (211) is fixedly connected to the middle right side of the secondary gear (210). The right end of the second rotating rod (211) is movably connected to the upper inner wall of the rotating frame (109). The outer wall of the second rotating rod (211) is located inside the rotating frame (109) and a lower pressure roller (212) is fixedly connected thereto.

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