An ultra-thin polypropylene film stretching machine

Abstract

The invention relates to the field of polypropylene film forming and processing, in particular to an ultra-thin polypropylene film stretching machine, comprising a machine body and a polypropylene film, wherein an inner cavity of the machine body is arranged inside the machine body, a plurality of stretching clamping rods are rotatably installed between inner side strips on both sides of an inner wall of the inner cavity of the machine body, a turntable is rotatably installed at four corners of the inner wall of the machine body, a plurality of upper clamping plates and a plurality of lower clamping plates are transmission sleeved on the outer walls of two turntables on the same side of the inner cavity of the machine body, a negative pressure adsorption device is arranged between the two turntables on the same side of the inner cavity of the machine body, and the invention forms a negative pressure between the upper clamping plate and the lower clamping plate through the negative pressure adsorption device, uniformly adsorbs the edges of both sides of the polypropylene film, and at the same time, the upper clamping plate and the lower clamping plate expand to both sides, and the polypropylene film is stretched transversely, which is beneficial to uniform stress on the edge of the polypropylene film, reduces the waste area generated on both sides of the polypropylene film, and is beneficial to improving the aesthetics and performance of the polypropylene film.

Description

Technical Field

[0001] The invention relates to the field of plastic molding and processing, and in particular to an ultra-thin polypropylene film stretching machine. Background Art

[0002] The prior art has the following deficiencies: the existing polypropylene film stretching machine uses a clamp of a special structure to clamp both sides of the polypropylene film and stretch it transversely. During the transverse stretching process, the clamp needs to tightly clamp the edge of the film for effective stretching; however, excessive pressure applied by the clamp may cause stress concentration in the edge area of ​​the film. This concentrated stress may cause the material in the edge area of ​​the film to deform during transverse stretching, especially at the edge of the film. The clamp may not be able to evenly distribute the stress, resulting in increased stress in the local area, large-area warping or deformation of the material at the edge, resulting in a wider waste area on both sides of the stretched polypropylene film, causing a waste of raw materials; and according to the edge effect principle of the film, the edge of the polypropylene film in the clamping area is usually subjected to greater stress than the middle part, because the film material in the edge area is directly affected by the clamp, and these stresses will cause local deformation of the edge material. Since the boundary conditions of the edge of the film are different from those in the middle area, the film may form wrinkles or ripples in the clamp contact area, affecting the overall appearance and performance of the film. At the same time, the deformation of the edge area may cause uneven stretching of the film, affecting the performance of the final product.

[0003] Therefore, it is necessary to invent a kind of ultra-thin polypropylene film stretching machine. Summary of the invention

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ultra-thin polypropylene film stretching machine, comprising a machine body and a polypropylene film, wherein an inner cavity of the machine body is arranged inside the machine body, and the inner cavity of the machine body extends through one end of the machine body to the other end, and a narrow film support and a wide film support are arranged on the outer sides of the two ends of the inner cavity of the machine body respectively, and a narrow film material roller is rotatably installed at the lower part of the narrow film support, and the polypropylene film is wound and rolled on the narrow film material roller, and one end of the polypropylene film is drawn out from the narrow film material roller and passes through the inner cavity of the machine body to one side of the wide film support, and inner strips are fixedly installed on both sides of the inner wall of the inner cavity of the machine body, and the inner strips are arranged on both sides of the edge of the polypropylene film, and the inner wall of the inner cavity of the machine body is fixedly installed with inner strips. A plurality of stretching clamping rods are rotatably installed between the inner strips on the two sides, and the stretching clamping rods are used to clamp the upper and lower sides of the polypropylene film. Turntables are rotatably installed at the four corners of the inner wall of the body cavity. The outer walls of the two turntables on the same side of the body cavity are transmission sleeved with a plurality of upper clamping plates and a plurality of lower clamping plates. The side edges of the polypropylene film pass through the upper and lower inner strips and extend between the upper clamping plates and the lower clamping plates. The upper clamping plates and the lower clamping plates are used to clamp the two side edges of the polypropylene film. A negative pressure adsorption device is arranged between the two turntables on the same side of the body cavity. The negative pressure adsorption device is used to form negative pressure between the upper clamping plates and the lower clamping plates that clamp the polypropylene film, and evenly adsorb the two side edges of the polypropylene film.

[0005] Preferably, the notch at one end of the body inner cavity close to the narrow film support is narrower, and the notch at one end of the body inner cavity close to the wide film support is wider. The body inner cavity presents a gradual trumpet-shaped structure. The lengths of a plurality of stretching clamping rods arranged in the body inner cavity gradually increase with the width of the inner wall of the body inner cavity. A feed roller is rotatably installed at the narrow notch end of the inner wall of the body inner cavity, and a discharge roller is rotatably installed at the wider notch end of the inner wall of the body inner cavity. Feed rollers and discharge rollers are provided on the upper and lower sides of the polypropylene film.

[0006] Preferably, both ends of the stretching clamp rod are retracted inwardly, the rotating shaft end of the stretching clamp rod is fixedly connected to a motor, and an electric heating wire is installed inside the stretching clamp rod, and the electric heating wire is used to heat the stretching clamp rod. The stretching clamp rods are arranged between the feed roller and the discharge roller, and the rotation speed of the stretching clamp rod increases successively from the discharge roller end to the feed roller end.

[0007] Preferably, the spacing between the turntables on both sides of the narrower end of the body cavity is smaller than the spacing between the turntables on both sides of the wider end of the body cavity, the upper end of the turntable's shaft passes through the body cavity and is fixedly connected to the first motor, the first motor is fixedly mounted on the top surface of the body cavity, the inner strip and the upper and lower splints close to the inner strip are all in contact with the inner wall of the body cavity of the trumpet-shaped structure.

[0008] Preferably, several of the upper splints are rotatably connected to each other to form a ring structure and are sleeved between the two turntables on the same side of the inner cavity of the machine body. Several of the lower splints are also rotatably connected to each other to form a ring structure and are sleeved between the two turntables on the same side of the inner cavity of the machine body. The upper splints correspond to the lower splints one by one, and the gap between the upper splints and the lower splints expands outward near the side of the inner strip. The outer walls of the upper splints and the lower splints are sleeved with splint rubber sleeves.

[0009] Preferably, the negative pressure adsorption device includes an air suction cabin, which is arranged between two turntables on the same side of the inner cavity of the machine body, and the air suction cabin is fixedly installed on both sides of the inner cavity of the machine body, and a negative pressure air cabin is fixedly connected to the side of the air suction cabin close to the inner strip, and an end of the negative pressure air cabin away from the air suction cabin is tightly attached to the gap between the upper splint and the lower splint away from the side of the inner strip, and the inner wall of the negative pressure air cabin shrinks inwardly near the end tightly attached to the gap.

[0010] Preferably, the negative pressure adsorption device includes an air cabin bottom plate, which is fixedly installed on both sides of the bottom surface of the inner cavity of the machine body, one end of the vacuum cabin away from the negative pressure air cabin downwardly penetrates the inner cavity of the machine body and is connected to the air cabin bottom plate, a plurality of impeller cabins are arranged and installed in the air cabin bottom plate, one end of the impeller cabin extends through the air cabin bottom plate, an impeller is rotatably installed in the impeller cabin, and the shaft end of the impeller is fixedly connected to the second motor.

[0011] Preferably, two narrow film clamping rollers are rotatably mounted on the upper part of the narrow film support, two wide film clamping rollers are rotatably mounted on the upper part of the wide film support, and a wide film material roller is rotatably mounted on the lower part of the wide film support, and the rotating shaft ends of the narrow film material roller, narrow film clamping roller, wide film clamping roller and wide film material roller are all installed and connected with motors.

[0012] Preferably, the polypropylene film wound on the narrow film material roller passes through the narrow film clamping roller and the feed roller in sequence and enters the inner cavity of the machine body, the polypropylene film entering the inner cavity of the machine body passes through all the stretching clamping rollers and the discharge roller in sequence and passes out of the inner cavity of the machine body, and the polypropylene film passing out of the inner cavity of the machine body passes through the wide film clamping roller and is wound and rolled on the wide film material roller.

[0013] The beneficial effects of the present invention are as follows: one end of the polypropylene film is drawn out from the narrow film material roller and passes through the inner cavity of the machine, the turntable drives the upper clamp and the lower clamp to move along the inner wall of the inner cavity of the machine, and the rotating stretching clamp is cooperated to make the polypropylene film transmitted in the inner cavity of the machine. During the transmission of the polypropylene film, a negative pressure is formed between the upper clamp and the lower clamp that clamp the polypropylene film through the negative pressure adsorption device, and the edges of both sides of the polypropylene film are evenly adsorbed. At the same time, the upper clamp and the lower clamp expand to both sides to stretch the polypropylene film laterally, so as to achieve the effect of uniformly stressing the edges of the polypropylene film during the stretching process, which is beneficial to weakening the stress concentration in the edge area of ​​the polypropylene film, reducing the wrinkles or ripples formed on the polypropylene film in the contact area of ​​the clamp, reducing the waste area generated on both sides of the polypropylene film, making the stretching of the polypropylene film more uniform, while improving the overall aesthetics and performance of the polypropylene film, but also saving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A front view of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0015] Figure 2 A schematic diagram of the internal structure of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0016] Figure 3 A side view of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0017] Figure 4 A schematic diagram of the top view of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0018] Figure 5 A schematic diagram of the arrangement of stretching clamps of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0019] Figure 6 An exploded diagram of the internal structure of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0020] Figure 7 A schematic diagram of the internal structure of a negative pressure adsorption device of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0021] Figure 8 An exploded diagram of the turntable structure of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0022] Fig. 9 A side cross-sectional view of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0023] Fig.10 The present invention provides Figure 7 Enlarged view of point A in the middle;

[0024] Fig.11 The present invention provides Figure 8 Enlarged view of point B in the middle;

[0025] Fig.12 The present invention provides Fig. 9 Enlarged view of point C in the middle;

[0026] Fig.13 A schematic diagram of the structure of a narrow film support of an ultra-thin polypropylene film stretching machine provided by the present invention;

[0027] Fig.14 A schematic diagram of the wide film support structure of an ultra-thin polypropylene film stretching machine provided by the present invention.

[0028] In the figure: the body cavity 11, the inner strip 12, the feed roller 13, the discharge roller 14, the narrow film support 15, the narrow film material roller 16, the narrow film clamping roller 17, the wide film support 18, the wide film clamping roller 19, the wide film material roller 20, the turntable 21, the first motor 22, the upper clamping plate 23, the lower clamping plate 24, the clamping plate rubber sleeve 25, the stretching clamping rod 26, the negative pressure air cabin 27, the exhaust cabin 28, the air cabin bottom plate 29, the impeller cabin 30, the impeller 31, the second motor 32, and the polypropylene film 4. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] Embodiment 1, as Figure 1 - Figure 6As shown, an ultra-thin polypropylene film stretching machine in an embodiment of the first aspect of the present invention comprises a machine body and a polypropylene film 4, an inner cavity 11 of the machine body is arranged inside the machine body, the inner cavity of the machine body extends through one end of the machine body to the other end, a narrow film support 15 and a wide film support 18 are arranged on the outer sides of both ends of the inner cavity 11 of the machine body respectively, a narrow film material roller 16 is rotatably installed at the lower part of the narrow film support 15, the polypropylene film 4 is wound and rolled on the narrow film material roller 16, one end of the polypropylene film 4 is drawn out from the narrow film material roller 16 and passes through the inner cavity 11 of the machine body to one side of the wide film support 18, inner strips 12 are fixedly installed on both sides of the inner wall of the inner cavity 11 of the machine body, the upper and lower sides of the side edges of the polypropylene film 4 are arranged with the inner strips 12, and the inner strips 12 on both sides of the inner wall of the inner cavity 11 of the machine body are arranged with the inner strips 12 A plurality of stretching clamping rods 26 are rotatably installed in the middle, and the stretching clamping rods 26 are used to clamp the upper and lower sides of the polypropylene film 4. A turntable 21 is rotatably installed at the four corners of the inner wall of the body cavity 11. The outer walls of the two turntables 21 on the same side of the body cavity 11 are transmission-sleeved with a plurality of upper clamping plates 23 and a plurality of lower clamping plates 24. The side edges of the polypropylene film 4 pass through the upper and lower inner strips 12 and extend between the upper clamping plates 23 and the lower clamping plates 24. The upper clamping plates 23 and the lower clamping plates 24 are used to clamp the two side edges of the polypropylene film 4. A negative pressure adsorption device is arranged between the two turntables 21 on the same side of the body cavity 11. The negative pressure adsorption device is used to form negative pressure between the upper clamping plates 23 and the lower clamping plates 24 that clamp the polypropylene film 4, and evenly adsorb the two side edges of the polypropylene film 4.

[0031] In the above embodiment, it should be noted that one end of the polypropylene film 4 is pulled out from the narrow film material roller 16 and passes through the inner cavity 11 of the machine body, and the driving turntable 21 drives the upper clamping plate 23 and the lower clamping plate 24 to move along the inner wall of the inner cavity 11 of the machine body, and cooperates with the rotating stretching clamping rod 26 to drive the polypropylene film 4 to be transmitted in the inner cavity 11 of the machine body. During the transmission process of the polypropylene film 4, a negative pressure is formed between the upper clamping plate 23 and the lower clamping plate 24 clamping the polypropylene film 4 through the negative pressure adsorption device, and the two side edges of the polypropylene film 4 are evenly adsorbed. At the same time, the upper clamping plate 23 and the lower clamping plate 24 expand to both sides to stretch the polypropylene film 4 laterally, so as to achieve the effect of uniformly stressing the edges of the polypropylene film 4 during the stretching process, weaken the stress concentration in the edge area of ​​the polypropylene film 4, reduce the wrinkles or ripples formed by the polypropylene film 4 in the contact area of ​​the clamp, reduce the waste area generated on both sides of the polypropylene film 4, make the stretching of the polypropylene film 4 more uniform, and improve the overall aesthetics and performance of the polypropylene film 4.

[0032] Embodiment 2, as Figure 4 - Figure 5As shown, an ultra-thin polypropylene film stretching machine includes all the contents of Example 1, in addition, the notch at one end of the machine body cavity 11 close to the narrow film support 15 is narrower, and the notch at one end of the machine body cavity 11 close to the wide film support 18 is wider, the machine body cavity 11 is a gradually changing trumpet-shaped structure, and the lengths of the plurality of stretching clamping rods 26 arranged in the machine body cavity 11 gradually increase with the width of the inner wall of the machine body cavity 11, and the feed roller 13 is rotatably installed at the narrow notch end of the inner wall of the machine body cavity 11, and the machine body cavity 1 The wide slot end of the inner wall is rotatably mounted with a discharge roller 14, the upper and lower sides of the polypropylene film 4 are both provided with a feed roller 13 and a discharge roller 14, the two ends of the stretching clamping rod 26 are retracted inwardly, the rotating shaft end of the stretching clamping rod 26 is fixedly connected with a motor, and an electric heating wire is installed inside the stretching clamping rod 26, and the electric heating wire is used to heat the stretching clamping rod 26. The stretching clamping rods 26 are arranged between the feed roller 13 and the discharge roller 14, and the rotation speed of the stretching clamping rod 26 increases from the discharge roller 14 end to the feed roller 13 end.

[0033] In the above embodiment, it should be noted that the rotating shaft ends of the feed roller 13 and the discharge roller 14 are connected to a motor, and the stretching clamping rod 26, the feed roller 13 and the discharge roller 14 are all driven by the motor. The rotation speed of the feed roller 13 is lower than the slowest rotation speed of the stretching clamping rod 26, and the rotation speed of the discharge roller 14 is higher than the fastest rotation speed of the stretching clamping rod 26. By starting the stretching clamping rod 26, the feed roller 13 and the discharge roller 14, the polypropylene film 4 is driven to move in the body cavity 11, and the speed difference between the stretching clamping rod 26, the feed roller 13 and the discharge roller 14 is used to achieve the stretching of the polypropylene film 4. The propylene film 4 is stretched uniformly longitudinally; the electric heating wire inside the stretching clamp 26 is started to heat the stretching clamp 26 to soften the polypropylene film 4 so that it can be stretched more uniformly, which can effectively avoid the polypropylene film 4 from breaking during the stretching process; the brackets at both ends of the stretching clamp 26 are smaller than the middle diameter of the stretching clamp 26, which can reduce the stress on the edges of the polypropylene film 4 on both sides during the transmission process, and squeeze the polypropylene material in the middle to both sides, so as to achieve the effect of cooperating with the upper clamp 23 and the lower clamp 24 to stretch the polypropylene film 4 horizontally.

[0034] Embodiment 3, as Figure 4-Figure 6 , Figure 8 , Fig. 9 , Fig.11 , Fig.12As shown, an ultra-thin polypropylene film stretching machine includes all the contents of Example 2. In addition, the spacing between the turntables 21 on both sides of the narrower end of the body cavity 11 is smaller than the spacing between the turntables 21 on both sides of the wider end of the body cavity 11. The upper end of the rotating shaft of the turntable 21 passes through the body cavity 11 and is fixedly connected to the first motor 22. The first motor 22 is fixedly mounted on the top surface of the body cavity 11. The inner strip 12 and the upper clamping plate 23 and the lower clamping plate 24 close to the inner strip 12 are all fitted in the body cavity 11 of the trumpet-shaped structure. The wall, a plurality of upper splints 23 are rotatably connected to form an annular structure and are sleeved between the two turntables 21 on the same side of the body cavity 11, a plurality of lower splints 24 are also rotatably connected to form an annular structure and are sleeved between the two turntables 21 on the same side of the body cavity 11, the upper splints 23 and the lower splints 24 correspond one to one, the gap between the upper splints 23 and the lower splints 24 expands outward near the side of the inner strip 12, and the outer walls of the upper splints 23 and the lower splints 24 are sleeved with splint rubber sleeves 25.

[0035] In the above embodiment, it should be noted that the distance between the upper clamping plate 23 and the lower clamping plate is smaller than the initial thickness of the polypropylene film 4, and the thickness of the polypropylene film 4 will become thinner during the stretching process. By starting the first motor 22 to drive the turntable 21 to rotate, the upper clamping plate 23 and the lower clamping plate 24 are driven to clamp the edge of the polypropylene film 4 and drive the polypropylene film 4 to move. The special structure of the gap between the upper clamping plate 23 and the lower clamping plate 24 on one side expanding outward can relieve the clamping stress of the upper clamping plate 23 and the lower clamping plate 24 on the edge of the polypropylene film 4, and cooperate with the clamping plate rubber sleeve 25 to achieve the effect of uniformly stressing the edge of the polypropylene film 4. At the same time, the upper clamping plate 23 and the lower clamping plate 24 expand to both sides during the transmission process, driving the polypropylene film 4 to stretch uniformly in the horizontal direction.

[0036] Embodiment 4, as Figure 3 , Figure 6 , Figure 7 , Fig. 9 , Fig.10 , Fig.12As shown, an ultra-thin polypropylene film stretching machine includes all the contents of Example 3. In addition, the negative pressure adsorption device includes an air suction cabin 28, which is arranged between two turntables 21 on the same side of the body inner cavity 11. The air suction cabin 28 is fixedly installed on both sides of the body inner cavity 11. The side of the air suction cabin 28 close to the inner strip 12 is fixedly connected to a negative pressure air cabin 27. The end of the negative pressure air cabin 27 away from the air suction cabin 28 is closely attached to the gap between the upper clamping plate 23 and the lower clamping plate 24 away from the side of the inner strip 12. The negative pressure air cabin 27 is fixedly connected to the inner strip 12 on one side of the inner strip 12. The inner wall of the cabin 27 is contracted inward at one end close to the gap, and the negative pressure adsorption device includes an air cabin bottom plate 29, which is fixedly installed on both sides of the bottom surface of the body inner cavity 11, and the end of the vacuum cabin 28 away from the negative pressure air cabin 27 penetrates downward through the body inner cavity 11 and is connected to the air cabin bottom plate 29, and a plurality of impeller cabins 30 are arranged and installed in the air cabin bottom plate 29, and one end of the impeller cabin 30 penetrates and extends out of the air cabin bottom plate 29, and an impeller 31 is rotatably installed in the impeller cabin 30, and the shaft end of the impeller 31 is fixedly connected to the second motor 32.

[0037] In the above embodiment, it should be noted that, since the structure of the upper clamping plate 23 and the lower clamping plate 24 weakens the clamping stress of the upper clamping plate 23 and the lower clamping plate 24 on the edge of the polypropylene film 4, a negative pressure adsorption device is required to reinforce the lost clamping force to prevent the edge of the polypropylene film 4 from falling off from between the upper clamping plate 23 and the lower clamping plate 24; by starting the second motor 32 to drive the impeller 31 in the impeller chamber 30 to rotate at a high speed, the air in the exhaust chamber 28 is discharged, and a negative pressure is formed in the negative pressure air chamber 27, so as to achieve the effect of forming a negative pressure in the gap between the upper clamping plate 23 and the lower clamping plate 24, and evenly adsorbing the edge of the polypropylene film 4.

[0038] Embodiment 5, as Figure 1 - Figure 5 , Fig.13 and Fig.14 As shown, an ultra-thin polypropylene film stretching machine includes all the contents of Example 2. In addition, two narrow film clamping rollers 17 are rotatably installed on the upper part of the narrow film support 15, two wide film clamping rollers 19 are rotatably installed on the upper part of the wide film support 18, and a wide film material roller 20 is rotatably installed on the lower part of the wide film support 18. The rotating shaft ends of the narrow film material roller 16, the narrow film clamping roller 17, the wide film clamping roller 19 and the wide film material roller 20 are all installed and connected with motors. The polypropylene film 4 wrapped around the narrow film material roller 16 passes through the narrow film clamping roller 17 and the feed roller 13 in turn and enters the body cavity 11. The polypropylene film 4 entering the body cavity 11 passes through all the stretching clamping rollers 26 and the discharge roller 14 in turn and passes out of the body cavity 11. The polypropylene film 4 passing out of the body cavity 11 passes through the wide film clamping roller 19 and is wound and rolled on the wide film material roller 20.

[0039] In the above embodiment, it should be noted that by starting the narrow film material roller 16 and the narrow film clamping roller 17 to rotate, in cooperation with the rotating feed roller 13, the effect of continuously conveying the pre-stretched polypropylene film 4 into the body cavity 11 is achieved, and then by starting the wide film material roller 20 and the wide film clamping roller 19 to rotate, in cooperation with the rotating discharge roller 14, the effect of winding the stretched polypropylene film 4 onto the wide film material roller 20 is achieved.

[0040] The use process of the present invention is as follows: a person skilled in the art will pull one end of the polypropylene film 4 out of the narrow film material roller 16 and pass it through the inner cavity 11 of the machine body, start the narrow film material roller 16 and the narrow film clamping roller 17 to rotate, cooperate with the rotating feed roller 13 to continuously transport the polypropylene film 4 before stretching into the inner cavity 11 of the machine body, then start the stretching clamping roller 26 and the first motor 22, the first motor 22 drives the turntable 21 to rotate, drives the upper clamping plate 23 and the lower clamping plate 24 to clamp the edge of the polypropylene film 4 and drive the polypropylene film 4 to move, then starts the second motor 32 to drive the impeller 31 in the impeller cabin 30 to rotate at high speed, and exhausts the air. The air in the cabin 28 is discharged, and negative pressure is formed in the negative pressure air cabin 27, and negative pressure is formed in the gap between the upper clamping plate 23 and the lower clamping plate 24 to evenly adsorb the edge of the polypropylene film 4. Then, the upper clamping plate 23 and the lower clamping plate 24 expand to both sides during the transmission process, driving the polypropylene film 4 to be evenly stretched laterally. At the same time, the speed difference between the stretching clamping roller 26, the feed roller 13 and the discharge roller 14 is used to achieve uniform longitudinal stretching of the polypropylene film 4. Finally, the wide film material roller 20 and the wide film clamping roller 19 are started to rotate, and the rotating discharge roller 14 is cooperated to achieve the goal of winding the stretched polypropylene film 4 on the wide film material roller 20.

[0041] The above is only a preferred embodiment of the present invention. Any person skilled in the art may modify the present invention by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An ultra-thin polypropylene film stretching machine, comprising a machine body (11), wherein a slot is arranged inside the machine body (11), wherein the slot extends from one end of the machine body (11) to the other end of the machine body (11), and a narrow film support (15) and a wide film support (18) are arranged on the outer sides of the two ends of the slot of the machine body (11), respectively, and a narrow film material roller (16) is rotatably installed at the lower part of the narrow film support (15), and the polypropylene film (4) is wound and rolled on the narrow film material roller (16), and one end of the polypropylene film (4) is drawn out from the narrow film material roller (16) and passes through the inner wall of the slot of the machine body (11) to the machine body (11) and a side close to the wide film support (18), characterized in that: Inner strips (12) are fixedly installed on both sides of the grooved inner wall of the machine body (11), and inner strips (12) are arranged on both upper and lower sides of the side edge of the polypropylene film (4). A plurality of stretching clamping rods (26) are rotatably installed between the inner strips (12) on both sides of the grooved inner wall of the machine body (11), and the stretching clamping rods (26) can clamp the upper and lower sides of the polypropylene film (4). Turntables (21) are rotatably installed at the four corners of the inner wall of the machine body (11), and the outer walls of the two turntables (21) on the same side of the groove of the machine body (11) are drivingly sleeved with a plurality of upper clamping plates (23) and a plurality of lower clamping plates (24), and the side edge of the polypropylene film (4) can pass between the inner strips (12) on the upper and lower sides and extend into between the upper clamping plates (23) and the lower clamping plates (24). The upper clamping plate (23) and the lower clamping plate (24) are capable of clamping the edges of both sides of the polypropylene film (4); a negative pressure adsorption device is arranged between the two turntables (21) on the same side of the groove of the body (11); the negative pressure adsorption device is capable of forming a negative pressure between the upper clamping plate (23) and the lower clamping plate (24) clamping the polypropylene film (4), and uniformly adsorbing the edges of both sides of the polypropylene film (4); the groove of the body (11) is narrower at one end close to the narrow film support (15); the groove of the body (11) is wider at one end close to the wide film support (18); the groove of the body (11) is in a gradually changing trumpet-shaped structure; the lengths of the plurality of stretching clamping rods (26) arranged in the groove of the body (11) increase with the length of the groove of the body (11) The width of the inner wall gradually becomes longer, a feed roller (13) is rotatably installed at the narrower notch end of the grooved inner wall of the machine body (11), and a discharge roller (14) is rotatably installed at the wider notch end of the grooved inner wall of the machine body (11). Feed rollers (13) and discharge rollers (14) are provided on the upper and lower sides of the polypropylene film (4). Both ends of the stretching clamping rod (26) are slightly retracted inwardly, and the rotating shaft end of the stretching clamping rod (26) is fixedly connected to a motor. A heating wire is installed inside the stretching clamping rod (26), and the heating wire inside the stretching clamping rod (26) can heat the stretching clamping rod (26). All the stretching clamping rods (26) are arranged between the feed roller (13) and the discharge roller (14). A plurality of stretching clamping rods in the groove of the machine body (11) The rotation speed of (26) increases from the end of the discharge roller (14) to the end of the discharge roller (14), the spacing between the turntables (21) on both sides of the narrower end of the slot of the body (11) is smaller than the spacing between the turntables (21) on both sides of the wider end of the slot of the body (11), the upper end of the rotating shaft of the turntable (21) passes through the body (11) and is fixedly connected to the first motor (22), the first motor (22) is fixedly installed on the top surface of the body (11), the inner strip (12) and the upper clamping plate (23) and the lower clamping plate (24) close to the inner strip (12) are all in contact with the inner wall of the slot of the body (11) with a trumpet-shaped structure, and a plurality of the upper clamping plates (23) are rotatably connected to each other to form an annular structure and are sleeved between the two turntables (21) on the same side of the slot of the body (11),The plurality of lower clamping plates (24) are also rotatably connected to each other to form an annular structure and are sleeved between two turntables (21) on the same side of the slot of the machine body (11). The upper clamping plates (23) correspond to the lower clamping plates (24) one by one. The gap between the upper clamping plates (23) and the lower clamping plates (24) expands outwards near the side of the inner strip (12). The outer walls of the upper clamping plates (23) and the lower clamping plates (24) are sleeved and installed with clamping plate rubber sleeves (25). The negative pressure adsorption device includes an air extraction chamber (28), and the air extraction chamber (28) is provided with The air extraction chamber (28) is fixedly installed inside the machine body (11) on both sides of the machine body (11) slot between two rotating disks (21) on the same side of the machine body (11) slot, and a negative pressure air chamber (27) is fixedly connected to a side of the air extraction chamber (28) close to the inner strip (12), and an end of the negative pressure air chamber (27) away from the air extraction chamber (28) is in close contact with a side of the gap between the upper clamping plate (23) and the lower clamping plate (24) away from the inner strip (12), and an inner wall of the negative pressure air chamber (27) close to the end in close contact with the gap is contracted inwards.

2. The ultra-thin polypropylene film stretching machine according to claim 1, characterized in that: The negative pressure adsorption device comprises an air chamber bottom plate (29), wherein the air chamber bottom plate (29) is fixedly mounted on both sides of the bottom surface of the machine body (11); one end of the air extraction chamber (28) away from the negative pressure air chamber (27) passes through the machine body (11) downward and is connected to the air chamber bottom plate (29); a plurality of impeller chambers (30) are arranged and mounted in the air chamber bottom plate (29); one end of the impeller chamber (30) passes through and extends out of the air chamber bottom plate (29); an impeller (31) is rotatably mounted in the impeller chamber (30); and a rotating shaft end of the impeller (31) is fixedly connected to a second motor (32).

3. The ultra-thin polypropylene film stretching machine according to claim 1, characterized in that: Two narrow film clamping rollers (17) are rotatably mounted on the upper part of the narrow film support (15), two wide film clamping rollers (19) are rotatably mounted on the upper part of the wide film support (18), and a wide film material roller (20) is rotatably mounted on the lower part of the wide film support (18). The rotating shaft ends of the narrow film material roller (16), the narrow film clamping roller (17), the wide film clamping roller (19) and the wide film material roller (20) are all connected to motors.

4. The ultra-thin polypropylene film stretching machine according to claim 3, characterized in that: The polypropylene film (4) wound on the narrow film material roller (16) passes through the narrow film clamping roller (17) and the feed roller (13) in sequence and enters the slot of the machine body (11). The polypropylene film (4) entering the slot of the machine body (11) passes through all the stretching clamping rollers (26) and the discharge roller (14) in sequence and passes out of the slot of the machine body (11). The polypropylene film (4) passing through the slot of the machine body (11) passes through the wide film clamping roller (19) and is wound and rolled on the wide film material roller (20).

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