Plastic Film Flattening and Tensioning Device and Blister Machine

Abstract

The present application provides a leveling and tensioning device for a plastic film and a plastic suction machine, which simultaneously drive a first telescopic drive assembly and a second telescopic drive assembly to drive the first rotating frame and the second rotating frame to rotate simultaneously, so that the tensioning roller arc rotates up and down relative to the support frame. That is, when the plastic film is on the tensioning roller, the tensioning roller rotates up and down to adjust the tension of the plastic film. Therefore, it is possible to adapt to the tension of different plastic films without manual adjustment, which can greatly reduce the labor cost and shorten the production time at the same time.

Description

Technical Field

[0001] The present invention relates to the field of packaging, and particularly to a flattening and tensioning device for a plastic film and a thermoforming machine. Background Art

[0002] Electronic components / devices including relays, connectors, etc. are transferred (for example, transported downstream to a client) in a way of tray packaging and batch transfer, which requires specific trays for packaging electronic components. The trays for packaging electronic components are usually thermoformed trays (i.e., plastic inner trays) that are easy to produce, low in cost, light in weight, and convenient to use. The tray substrate of the thermoformed tray has a placement groove surrounded by a skirt with a hollow structure and capable of placing electronic components. The electronic components are regularly placed in the placement grooves on the tray substrate, which plays a role in protecting, beautifying, and facilitating the transfer of the electronic components. Thermoforming is a plastic processing technology. The main principle is to heat and soften a flat plastic sheet, then vacuum adsorb it on the surface of a mold and cool it to form. It is widely used in fields such as plastic packaging, lighting, advertising, and decoration. Thermoforming is also called vacuum forming, which is one of the thermoforming methods for thermoplastic plastics. Its process flow is as follows: clamp a sheet or plate-shaped film on the frame of the thermoforming device, heat and soften it, and then use vacuum to adsorb it on the mold through the air channels on the mold edge, and after short-time cooling, obtain the formed plastic product.

[0003] When the plastic film is loaded, it needs to be first flattened and pressed through a roller device, and at the same time, the tension of the plastic film is adjusted through a tension adjusting device. However, the traditional tension adjusting device needs to manually adjust the position of the tension roller up and down to adjust the tension of the plastic film. Therefore, the traditional tension adjusting device has the following defects: it requires manual adjustment, which wastes manpower and results in low production efficiency.

[0004] For example, a traditional thermoforming loading device such as the one disclosed in Patent Publication No. CN213386921U proposed a design of a thermoforming machine loading mechanism. Its specific technical solution is as follows: including a frame, a positioning groove is provided on the frame; a unwinding device, the unwinding device includes an unwinding roller, a positioning ring, a limiting member, a sliding member, a limiting pin, a buffer plate, a buffer bearing, and a buffer spring... and a locking device, the locking device includes a locking member and a screw, the locking member is rotatably provided on the frame, a locking groove is provided on the locking member, the locking groove is used to accommodate the positioning ring, the screw passes through the locking member, and the screw is used to be screwed with the frame. The tension roller in this technical solution is fixed to the frame and requires manual rotation of the position of the tension roller to adjust the tension of the plastic film, which also has the problem of being time-consuming and laborious. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies in the prior art and provide a leveling and tensioning device for plastic films and a plastic vacuum forming machine that do not require manual adjustment.

[0006] The object of the present invention is achieved by the following technical solutions:

[0007] A leveling and tensioning device for plastic films, comprising:

[0008] A support frame;

[0009] A leveling and pressing mechanism, the leveling and pressing mechanism comprising a pressing component and a driving roller component. The pressing component and the driving roller component are both installed on the support frame. The pressing component comprises a cylinder adjusting member and a driven roller. The cylinder adjusting member is fixed on the support frame, and the driven roller is fixed to the output end of the cylinder adjusting member. An upper feeding gap is formed between the driven roller and the driving roller component;

[0010] A tensioning mechanism, the tensioning mechanism comprising a first telescopic driving component, a second telescopic driving component, a first rotating frame, a second rotating frame and a tensioning roller. The first telescopic driving component and the second telescopic driving component are both installed on the support frame. The power output end of the first telescopic driving component is rotationally connected to the first rotating frame, and the first rotating frame is also rotationally connected to the support frame. The power output end of the second telescopic driving component is rotationally connected to the second rotating frame, and the second rotating frame is also rotationally connected to the support frame. One end of the tensioning roller is fixed to the first rotating frame, and the other end of the tensioning roller is fixed to the second rotating frame.

[0011] In one embodiment, the driving roller component comprises a rotating roller, a bearing member and a motor driving member. The motor driving member and the bearing member are both fixed on the support frame. The rotating roller passes through the support frame, and both ends of the rotating roller are respectively rotationally connected to the bearing member and the power output end of the motor driving member.

[0012] In one embodiment, the cylinder adjusting member comprises a cylinder driving member and a telescopic fixing frame. The cylinder driving member is fixed on the support frame. A part of the telescopic fixing frame passes through the support frame. The telescopic fixing frame is connected to the output end of the cylinder driving member, and the telescopic fixing frame is also rotationally connected to the driven roller.

[0013] In one embodiment, the first telescopic driving assembly includes a first telescopic driving motor and a first telescopic lead screw. The first telescopic driving motor is fixed on the support frame. One end of the first telescopic lead screw penetrates through the first telescopic driving motor and is connected to the power output end of the first telescopic driving motor, so that the first telescopic lead screw is slidably connected to the first telescopic driving motor. The other end of the first telescopic lead screw is rotatably connected to the first rotating frame.

[0014] In one embodiment, the second telescopic driving assembly includes a second telescopic driving motor and a second telescopic lead screw. The second telescopic driving motor is fixed on the support frame. One end of the second telescopic lead screw penetrates through the second telescopic driving motor and is connected to the power output end of the second telescopic driving motor, so that the second telescopic lead screw is slidably connected to the second telescopic driving motor. The other end of the second telescopic lead screw is rotatably connected to the second rotating frame.

[0015] In one embodiment, the first telescopic driving motor and the second telescopic driving motor are symmetrically fixed on the support frame.

[0016] In one embodiment, the first telescopic lead screw and the second telescopic lead screw are parallel to each other.

[0017] In one embodiment, the first rotating frame and the second rotating frame are parallel to each other.

[0018] In one embodiment, the driven roller and the rotating roller are parallel to each other.

[0019] A plastic thermoforming machine includes a plastic thermoforming device and the plastic film flattening and tensioning device according to any one of the above embodiments. The plastic thermoforming device is communicated with the plastic film flattening and tensioning device.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] The leveling and tensioning device for the plastic film of the present application forms a feeding gap between the driven roller and the driving roller assembly, that is, the plastic film can enter the tensioning mechanism through the feeding gap. When the driving roller assembly is driving, it continuously conveys the plastic film. At the same time, the driven roller rotates as the plastic film is conveyed, and the driven roller also has the effect of pressing and leveling the plastic film, that is, the plastic film is leveled when the driven roller rotates. At the same time, the driven roller can slide up and down relative to the support frame through the adjusting cylinder adjusting part to adjust the size of the feeding gap, so as to adapt to the leveling and pressing requirements of plastic films with different thicknesses. Further, the first telescopic driving assembly and the second telescopic driving assembly are driven simultaneously to drive the first rotating frame and the second rotating frame to rotate simultaneously, so that the tensioning roller arc rotates up and down relative to the support frame. That is, when the plastic film is on the tensioning roller, the tensioning roller rotates up and down to adjust the tension of the plastic film. Therefore, the tension of different plastic films can be adapted without manual adjustment, which can greatly reduce the labor cost and shorten the production time at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a schematic structural diagram of the leveling and tensioning device for the plastic film in one embodiment;

[0024] Figure 2 is a schematic structural diagram of the leveling and tensioning device for the plastic film in one embodiment;

[0025] Figure 3 is a schematic structural diagram of the leveling and tensioning device for the plastic film in one embodiment;

[0026] Figure 4 is a schematic structural diagram of the leveling and tensioning device for the plastic film in one embodiment;

[0027] Figure 5 is a schematic structural diagram of the leveling and tensioning device for the plastic film in one embodiment;

[0028] Figure 6 is a schematic structural diagram of the leveling and tensioning device for the plastic film in one embodiment;

[0029] Figure 7 is Figure 5 a partial structural enlarged view of the leveling and tensioning device for the plastic film;

[0030] Figure 8 is Figure 6Partial structural enlarged view of the leveling and tensioning device for the plastic film. Specific embodiments

[0031] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0032] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] The leveling and tensioning device for the plastic film provided in this application includes: a support frame, a leveling and pressing mechanism, and a tensioning mechanism; the leveling and pressing mechanism includes a pressing component and a driving roller component, both the pressing component and the driving roller component are installed on the support frame, the pressing component includes a cylinder adjusting part and a driven roller, the cylinder adjusting part is fixed on the support frame, the driven roller is fixed at the output end of the cylinder adjusting part, and a feeding gap is formed between the driven roller and the driving roller component; the tensioning mechanism includes a first telescopic driving component, a second telescopic driving component, a first rotating frame, a second rotating frame, and a tensioning roller, both the first telescopic driving component and the second telescopic driving component are installed on the support frame, the power output end of the first telescopic driving component is rotationally connected to the first rotating frame, the first rotating frame is also rotationally connected to the support frame, the power output end of the second telescopic driving component is rotationally connected to the second rotating frame, the second rotating frame is also rotationally connected to the support frame, one end of the tensioning roller is fixed on the first rotating frame, and the other end of the tensioning roller is fixed on the second rotating frame.

[0035] Please refer to Figures 1 to 3, To better understand the leveling and tensioning device 10 of the plastic film in this application, the following further explains the leveling and tensioning device 10 of the plastic film:

[0036] The leveling and tensioning device 10 of the plastic film in one embodiment includes: a support frame 100, a leveling and pressing mechanism 200, and a tensioning mechanism 300; the leveling and pressing mechanism 200 includes a pressing component 210 and a driving roller component 220, both the pressing component 210 and the driving roller component 220 are installed on the support frame 100, the pressing component 210 includes a cylinder adjusting part 2110 and a driven roller 2120, the cylinder adjusting part 2110 is fixed on the support frame 100, the driven roller 2120 is fixed to the output end of the cylinder adjusting part 2110, and a feeding gap is formed between the driven roller 2120 and the driving roller component 220; the tensioning mechanism 300 includes a first telescopic driving component 310, a second telescopic driving component 320, a first rotating frame 330, a second rotating frame 340, and a tensioning roller 350, both the first telescopic driving component 310 and the second telescopic driving component 320 are installed on the support frame 100, the power output end of the first telescopic driving component 310 is rotatably connected to the first rotating frame 330, the first rotating frame 330 is also rotatably connected to the support frame 100, the power output end of the second telescopic driving component 320 is rotatably connected to the second rotating frame 340, the second rotating frame 340 is also rotatably connected to the support frame 100, one end of the tensioning roller 350 is fixed to the first rotating frame 330, and the other end of the tensioning roller 350 is fixed to the second rotating frame 340.

[0037] In this embodiment, a feeding gap is formed between the driven roller 2120 and the driving roller component 220, that is, the plastic film can enter the tensioning mechanism 300 through the feeding gap. When the driving roller component 220 is driving, it continuously conveys the plastic film. At the same time, the driven roller 2120 rotates as the plastic film is conveyed, and the driven roller 2120 also has the effect of pressing and leveling the plastic film, that is, the driven roller 2120 levels the plastic film when it rotates. At the same time, by adjusting the cylinder adjusting part 2110, the driven roller 2120 can slide up and down relative to the support frame 100 to adjust the size of the feeding gap, so as to adapt to the leveling and pressing requirements of plastic films of different thicknesses. Further, by simultaneously driving the first telescopic driving component 310 and the second telescopic driving component 320 to drive the first rotating frame 330 and the second rotating frame 340 to rotate simultaneously, the arc of the tensioning roller 350 rotates up and down relative to the support frame 100, that is, when the plastic film is on the tensioning roller 350, the tensioning roller 350 rotates up and down to adjust the tension of the plastic film. Therefore, it is possible to adapt to the tension of different plastic films without manual adjustment, which can greatly reduce the labor cost and shorten the production time at the same time.

[0038] As Figure 2 shown, in one embodiment, the driving over-roller assembly 220 includes a rotating roller 2210, a bearing member 2220, and a motor driving member 2230. The motor driving member 2230 and the bearing member 2220 are both fixed to the support frame 100. The rotating roller 2210 passes through the support frame 100, and both ends of the rotating roller 2210 are rotatably connected to the bearing member 2220 and the power output end of the motor driving member 2230 respectively. It should be noted that by driving the motor driving member 2230, the rotating roller 2210 can be rotated, so that the plastic film can be conveyed. Coupled with the driven and pressing effects of the driven roller 2120, the plastic film will not deviate during conveying, so that the plastic film can be conveyed smoothly to the thermoforming device.

[0039] As Figure 2 shown, in one embodiment, the cylinder adjusting member 2110 includes a cylinder driving member 21110 and a telescopic fixing frame 21120. The cylinder driving member 21110 is fixed to the support frame 100. A part of the telescopic fixing frame 21120 passes through the support frame 100. The telescopic fixing frame 21120 is connected to the output end of the cylinder driving member 21110, and the telescopic fixing frame 21120 is also rotatably connected to the driven roller 2120. It should be noted that by driving the output of the cylinder driving member 21110, the telescopic fixing frame 21120 slides up and down relative to the support frame 100, so as to drive the driven roller 2120 to slide up and down relative to the support frame, thereby changing the size of the feeding gap and being able to adapt to plastic films of different thicknesses. Further, by reducing the feeding gap, that is, increasing the pressure of the driven roller 2120 on the plastic film, the flatness of the plastic film is effectively improved, and at the same time, the plastic film is not easily deviated during output, that is, the driven roller 2120 also plays a role of fixing and guiding.

[0040] As Figure 2As shown, in one embodiment, the first telescopic drive assembly 310 includes a first telescopic drive motor 3110 and a first telescopic lead screw 3120. The first telescopic drive motor 3110 is fixed to the support frame 100. One end of the first telescopic lead screw 3120 is inserted into the first telescopic drive motor 3110 and connected to the power output end of the first telescopic drive motor 3110, so that the first telescopic lead screw 3120 is slidably connected to the first telescopic drive motor 3110. The other end of the first telescopic lead screw 3120 is rotatably connected to the first rotating frame 330. It should be noted that a through cavity is formed in the first telescopic drive motor 3110. By driving the output of the first telescopic drive motor 3110, the first telescopic lead screw 3120 is driven to slide, that is, a part of the first telescopic lead screw 3120 slides back and forth in the through cavity, thereby driving the first rotating frame 330 to rotate, and further driving the tension roller 350 to move to adjust the tension of the plastic film.

[0041] As Figure 2 shown, in one embodiment, the second telescopic drive assembly 320 includes a second telescopic drive motor 3210 and a second telescopic lead screw 3220. The second telescopic drive motor 3210 is fixed to the support frame 100. One end of the second telescopic lead screw 3220 is inserted into the second telescopic drive motor 3210 and connected to the power output end of the second telescopic drive motor 3210, so that the second telescopic lead screw 3220 is slidably connected to the second telescopic drive motor 3210. The other end of the second telescopic lead screw 3220 is rotatably connected to the second rotating frame 340. It should be noted that a through cavity is formed in the second telescopic drive motor 3210. By driving the output of the second telescopic drive motor 3210, the second telescopic lead screw 3220 is driven to slide, that is, a part of the second telescopic lead screw 3220 slides back and forth in the through cavity, thereby driving the second rotating frame 340 to rotate, and further driving the tension roller 350 to move to adjust the tension of the plastic film.

[0042] As Figure 2 and Figure 3 shown, in one embodiment, the first telescopic drive motor 3110 and the second telescopic drive motor 3210 are axially symmetrically fixed to the support frame 100.

[0043] As Figure 2 and Figure 3 shown, in one embodiment, the first telescopic lead screw 3120 and the second telescopic lead screw 3220 are parallel to each other.

[0044] As Figure 2 and Figure 3 shown, in one embodiment, the first rotating frame 330 and the second rotating frame 340 are parallel to each other.

[0045] As shown Figure 3 in one embodiment, the driven roller 2120 and the rotating roller 2210 are parallel to each other.

[0046] Further, please refer to Figure 4 , in one embodiment, it further includes an unwinding rack 500. The unwinding rack 500 is installed on the support frame 100 and is used to place the plastic film roll. By placing the plastic film roll on the unwinding rack and cooperating with the driving roller assembly, the leveling and tensioning device of the plastic film can realize automatic feeding.

[0047] Further, it further includes a plurality of spraying components. The plurality of spraying components are installed on the support frame, and the spraying directions of the plurality of spraying components are set towards the unwinding rack. Since there is friction between the plastic film and the rotating roller, it is easy to have a jamming situation during unwinding. Therefore, in this embodiment, a plurality of spraying components are provided, and the spraying directions of the plurality of spraying components are set towards the unwinding rack, so that the plurality of spraying components can spray the plastic film on the unwinding rack, so that the surface of the plastic film in contact with the rotating roller becomes wet, thereby reducing the friction between the plastic film and the rotating roller, and further avoiding the jamming situation. At the same time, the smoothness of the plastic film unwinding is effectively improved. Further, the spraying component includes a spray head and a spray water pipe. The spray head is fixed on the support frame, and the water inlet of the spray head is communicated with one end of the spray water pipe, and the other end of the spray water pipe is communicated with the water source component. Further, an inclined angle is formed between the spray head and the support frame, and the inclined angle is 30 degrees - 45 degrees. When the inclined angle is 30 degrees - 45 degrees, the spraying effect of the spray head is better, and the water can be accurately sprayed on the plastic film. Further, the spray head is a high-speed centrifugal atomizing spray head. The high-speed centrifugal atomizing spray head can form water mist by high-speed centrifugation of water, so as to increase the contact area between water and the plastic film, and further effectively cover the water on the plastic film, and further effectively improve the smoothness of the plastic film conveying.

[0048] Further, the control method of the leveling and tensioning device 10 of the plastic film includes: first unwinding the plastic film; then threading the plastic film between the driven roller and the rotating roller; then obtaining the thickness of the plastic film; then controlling the starting telescopic amounts of the first telescopic motor and the second telescopic motor according to the thickness of the plastic film to make the plastic film have a preset tension; then respectively controlling the power output ends of the first telescopic driving motor and the second telescopic driving motor to extend, and at the same time further unwinding the plastic film until the plastic film rolling operation is completed.

[0049] Further, the steps of obtaining the thickness of the plastic film include: First, establish a database in which the stretching amounts of a plurality of plastic films respectively correspond one-to-one to the stretching amounts of a plurality of first telescopic driving motors and the stretching amounts of a plurality of second telescopic driving motors; Then, detect the thickness of the plastic film to be roll-pressed to obtain the actual thickness of the plastic film to be roll-pressed. Even further, the steps of controlling the starting stretching amounts of the first telescopic driving motor and the second telescopic driving motor according to the thickness of the plastic film include: First, retrieve the stretching amounts of the first telescopic driving motor and the second telescopic driving motor corresponding thereto in the database according to the actual thickness; Then, control the starting stretching amounts of the first telescopic driving motor and the second telescopic driving motor so that the tension of the plastic film realizes precise tension control, thereby improving the roll-pressing effect of the driven roller and the rotating roller jointly roll-pressing the plastic film, and further enabling the plastic film to have better flatness after roll-pressing. It should be noted that, by controlling the stretching amounts of the first telescopic driving motor and the second telescopic driving motor, the stretching amounts of the first telescopic lead screw and the second telescopic lead screw are controlled, so as to control the rotation of the tension roller.

[0050] Further, the thickness of the plastic film to be roll-pressed is detected by a CCD camera, so that the detection data of the thickness of the plastic film is more accurate. Even further, the steps of detecting the thickness of the plastic film to be roll-pressed by a CCD camera include: Scanning the surface of the plastic film to be roll-pressed by a CCD camera to obtain image data of the surface of the plastic film; Performing data processing and fitting on the image data of the surface of the plastic film to obtain three-dimensional image data of the plastic film; Calculating a plurality of thickness values of the plastic film according to the three-dimensional image data; Taking the average value of the plurality of thickness values to obtain the thickness of the plastic film.

[0051] Even further, please refer to Figures 5 to 7, in one example, it further includes a first sliding adjustment component 600 and a second sliding adjustment component 700. The first sliding adjustment component 600 includes two first slide rails 610 and a first sliding block 620. The two first slide rails 610 are both installed on the support frame. The first sliding block 620 is slidably connected to the two first slide rails 610 respectively, and the first telescopic driving motor 3110 is installed on the first sliding block 620. The second sliding adjustment component 700 includes two second slide rails 710 and a second sliding block 720. The two second slide rails 710 are both installed on the support frame. The second sliding block 720 is slidably connected to the two second slide rails 710 respectively, and the second telescopic driving motor 3210 is installed on the second sliding block 720. By setting the first sliding block 620 and the second sliding block 720 to be slidably connected to the two first slide rails 610 and the two second slide rails 710 respectively, the first telescopic driving motor 3110 and the second telescopic driving motor 3210 can slide relative to the support frame, thereby driving the tensioning roller to rotate. That is, by driving the output of the first telescopic driving motor 3110 and the second telescopic driving motor 3210 and driving the first telescopic driving motor 3110 and the second telescopic driving motor 3210 to slide, the tensioning roller is driven to rotate, and the rotation range of the tensioning roller also becomes larger, further improving the adjustable range of the tension of the plastic film. Therefore, it can adapt to the tension requirements of more different thicknesses. At the same time, the rotation time of the tensioning roller can be shortened through two-way adjustment, thereby shortening the production time of the plastic film.

[0052] This application also provides a plastic thermoforming machine, which includes a plastic thermoforming device and the plastic film leveling and tensioning device described in any of the above embodiments, and the plastic thermoforming device is communicated with the plastic film leveling and tensioning device.

[0053] In this embodiment, a feeding gap is formed between the driven roller and the driving roller assembly, that is, the plastic film can enter the tensioning mechanism through the feeding gap. The driving roller assembly continuously conveys the plastic film during driving. At the same time, the driven roller rotates as the plastic film is conveyed, and the driven roller also has the effect of pressing and leveling the plastic film, that is, the plastic film is leveled when the driven roller rotates. At the same time, the driven roller can slide up and down relative to the support frame through the adjusting cylinder adjuster to adjust the size of the feeding gap, so as to adapt to the leveling and pressing requirements of plastic films of different thicknesses. Further, the first telescopic driving assembly and the second telescopic driving assembly are simultaneously driven to drive the first rotating frame and the second rotating frame to rotate simultaneously, so that the tensioning roller arc rotates up and down relative to the support frame. That is, when the plastic film is on the tensioning roller, the tensioning roller rotates up and down to adjust the tension of the plastic film. Therefore, it can adapt to the tension of different plastic films without manual adjustment, which can greatly reduce the labor cost and shorten the production time at the same time.

[0054] Compared with the prior art, the present invention has at least the following advantages:

[0055] For the leveling and tensioning device of the plastic film in this application, a feeding gap is formed between the driven roller and the driving roller assembly, that is, the plastic film can enter the tensioning mechanism through the feeding gap. When the driving roller assembly is driving, it continuously conveys the plastic film. At the same time, the driven roller rotates as the plastic film is conveyed, and the driven roller also has the effect of pressing and leveling the plastic film, that is, the plastic film is leveled when the driven roller rotates. At the same time, the driven roller can slide up and down relative to the support frame through the adjusting cylinder adjusting part to adjust the size of the feeding gap, so as to adapt to the leveling and pressing requirements of plastic films with different thicknesses. Further, the first telescopic driving assembly and the second telescopic driving assembly are simultaneously driven to drive the first rotating frame and the second rotating frame to rotate simultaneously, so that the tensioning roller arc rotates up and down relative to the support frame. That is, when the plastic film is on the tensioning roller, the tensioning roller rotates up and down to adjust the tension of the plastic film. Therefore, the tension of different plastic films can be adapted without manual adjustment, which can greatly reduce the labor cost and shorten the production time at the same time.

[0056] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. An apparatus for flattening and tensioning a plastic film, characterized in that, it comprises: a support frame; a flattening and pressing mechanism, the flattening and pressing mechanism comprising a pressing component and a driving roller component. The pressing component and the driving roller component are both installed on the support frame. The pressing component comprises a cylinder adjusting member and a driven roller. The cylinder adjusting member is fixed to the support frame, and the driven roller is fixed to the output end of the cylinder adjusting member. A feeding gap is formed between the driven roller and the driving roller component. The driving roller component comprises a rotating roller, a bearing member and a motor driving member. The motor driving member and the bearing member are both fixed to the support frame. The rotating roller penetrates through the support frame, and both ends of the rotating roller are respectively rotationally connected to the bearing member and the power output end of the motor driving member; a tensioning mechanism, the tensioning mechanism comprising a first telescopic driving component, a second telescopic driving component, a first rotating frame, a second rotating frame and a tensioning roller. The first telescopic driving component and the second telescopic driving component are both installed on the support frame. The power output end of the first telescopic driving component is rotationally connected to the first rotating frame, and the first rotating frame is also rotationally connected to the support frame. The power output end of the second telescopic driving component is rotationally connected to the second rotating frame, and the second rotating frame is also rotationally connected to the support frame. One end of the tensioning roller is fixed to the first rotating frame, and the other end of the tensioning roller is fixed to the second rotating frame. The first telescopic driving component comprises a first telescopic driving motor and a first telescopic lead screw. The first telescopic driving motor is fixed to the support frame. One end of the first telescopic lead screw penetrates through the first telescopic driving motor and is connected to the power output end of the first telescopic driving motor, so that the first telescopic lead screw is slidably connected to the first telescopic driving motor. The other end of the first telescopic lead screw is rotationally connected to the first rotating frame.

2. The apparatus for flattening and tensioning a plastic film according to claim 1, characterized in that, the cylinder adjusting member comprises a cylinder driving member and a telescopic fixing frame. The cylinder driving member is fixed to the support frame. A part of the telescopic fixing frame penetrates through the support frame. The telescopic fixing frame is connected to the output end of the cylinder driving member, and the telescopic fixing frame is also rotationally connected to the driven roller.

3. The apparatus for flattening and tensioning a plastic film according to claim 1, characterized in that, the second telescopic driving component comprises a second telescopic driving motor and a second telescopic lead screw. The second telescopic driving motor is fixed to the support frame. One end of the second telescopic lead screw penetrates through the second telescopic driving motor and is connected to the power output end of the second telescopic driving motor, so that the second telescopic lead screw is slidably connected to the second telescopic driving motor. The other end of the second telescopic lead screw is rotationally connected to the second rotating frame.

4. The apparatus for flattening and tensioning a plastic film according to claim 3, characterized in that, the first telescopic driving motor and the second telescopic driving motor are symmetrically fixed to the support frame.

5. The leveling and tensioning device for plastic film according to claim 4, characterized in that, the first telescopic screw rod and the second telescopic screw rod are parallel to each other.

6. The leveling and tensioning device for plastic film according to claim 5, characterized in that, the first rotating frame and the second rotating frame are parallel to each other.

7. The leveling and tensioning device for plastic film according to claim 2, characterized in that, the driven roller and the rotating roller are parallel to each other.

8. A plastic vacuum forming machine, characterized in that, it includes a plastic vacuum forming device and the leveling and tensioning device for plastic film according to any one of claims 1-7, and the plastic vacuum forming device is in communication with the leveling and tensioning device for plastic film.

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