Pit punching device for aluminum plastic film

Abstract

The utility model relates to the technical field of battery cells, and discloses an aluminum-plastic film pit punching device which comprises a pit punching mechanism, the feeding mechanism is used for feeding the aluminum plastic film to the pit punching mechanism; the feeding mechanism comprises a feeding vertical frame which is vertically arranged; a second linear module is horizontally arranged on the feeding vertical frame; the first moving mechanism and the second moving mechanism move synchronously with the second linear module; the pitch changing mechanism is arranged, and after the aluminum plastic film is fed to the pitch changing mechanism through the first moving mechanism to be subjected to pitch changing, the second moving mechanism moves the aluminum plastic film subjected to pitch changing to the pit punching device to be subjected to pit punching; the aluminum plastic films are firstly cut in a segmented mode, then the distance between the aluminum plastic films is adjusted to correspond to the position of a pit punching head, and finally pit punching is conducted, so that the efficiency is guaranteed, and meanwhile the good yield is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery cell, and concretely relates to an aluminum plastic film pit punching device. BACKGROUND

[0002] The aluminum plastic film pit punching device is an equipment for punching pits on the surface of aluminum plastic film, and the main purpose is to punch specific pits on the aluminum plastic film to meet the needs of specific industries such as battery and electronic component packaging; and the aluminum plastic film is usually used in cooperation with other processing equipment to ensure that the size, shape and quality of the aluminum plastic film meet the requirements.

[0003] The current aluminum plastic film pit punching device has the following problems: the current aluminum plastic film pit punching device can punch a small number of pits at the same time, and the efficiency is low; or the aluminum plastic film is cut into pieces after multiple pits are punched on the aluminum plastic film at the same time, but this will cause poor pit punching in some pit positions.

[0004] The technical problem to be solved by the utility model is to provide an aluminum plastic film pit punching device that can punch multiple pits and has a high yield. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide an aluminum plastic film pit punching device that can punch multiple pits and has a high yield; the pit punching mechanism is a core functional component responsible for pit punching operation on the aluminum plastic film; the feeding mechanism is responsible for the feeding operation of the aluminum plastic film, and includes a vertical feeding stand, a second linear module and two moving mechanisms; the feeding mechanism ensures that the material can smoothly enter the pit punching station; the feeding stand is vertically installed and used for fixing and supporting the aluminum plastic film; the second linear module is horizontally installed on the feeding stand and used for driving the synchronous movement of the two moving mechanisms; the first moving mechanism and the second moving mechanism move synchronously with the second linear module; the first moving mechanism moves the aluminum plastic film to the distance changing mechanism, and the second moving mechanism moves the aluminum plastic film after distance changing to the pit punching mechanism; the distance changing mechanism is used for changing the distance of the aluminum plastic film during feeding, so that the position is more accurate and convenient for pit punching operation; the aluminum plastic film is first cut into segments, then the distance between the aluminum plastic films is adjusted to correspond to the position of the pit punching head, and finally pit punching is performed, so that the efficiency is ensured and a high yield is achieved.

[0006] An aluminum plastic film pit punching device includes a pit punching mechanism; further has a feeding mechanism for feeding the aluminum plastic film to the pit punching mechanism; the feeding mechanism includes a vertical feeding stand; the feeding stand is horizontally provided with a second linear module; the feeding stand is provided with a first moving mechanism and a second moving mechanism that move synchronously with the second linear module; and a distance changing mechanism is arranged, the aluminum plastic film is fed to the distance changing mechanism by the first moving mechanism, the aluminum plastic film after distance changing is moved to the pit punching device by the second moving mechanism, and pit punching is performed.

[0007] Preferably, the first moving mechanism comprises a first moving frame body moving synchronously with the second linear module; and the bottom of the first moving frame body is provided with a first rotary air cylinder; and the bottom of the first rotary air cylinder is connected with a first connecting plate; and the bottom of the first connecting plate is provided with two second lifting air cylinders; and each of the second lifting air cylinders is connected with a plurality of first adsorption plates.

[0008] Preferably, the second moving mechanism comprises a second moving frame body reciprocating synchronously with the second linear module; and the bottom of the second moving frame body is provided with a first driving motor; and a first screw rod is connected with the rotating shaft of the first driving motor; and the second moving frame body is provided with a first sliding rail and a second sliding rail at intervals; and a first sliding block and a second sliding block are provided and are in rotating cooperation with the first screw rod; and the second sliding block and the second sliding block are in sliding cooperation with the first sliding rail and the second sliding rail respectively; and each of the first sliding block and the second sliding block is connected with a third lifting air cylinder; and the piston rod of each of the third lifting air cylinders is connected with a second adsorption plate with an L-shaped cross section.

[0009] Preferably, the pit punching mechanism comprises a horizontally arranged pit punching frame; the pit punching frame is provided with a pit punching top base and a pit punching bottom base distributed vertically; and the top of the pit punching frame is provided with two pit punching motors at intervals; and the rotating shaft of each of the pit punching motors is connected with a mounting block through a screw thread; and the bottom of the mounting block is provided with a plurality of punching blocks at intervals; and the pit punching bottom base is formed with a plurality of punching holes corresponding to the punching blocks; the pit punching motor drives the mounting block and the punching block to move up and down synchronously, so that the punching blocks collide with the punching holes to complete the pit punching.

[0010] Preferably, the bottom of the pit punching frame is provided with a connecting bottom plate; and the connecting bottom plate is provided with a plurality of connecting columns; and the other ends of the connecting columns are fixedly connected with the pit punching bottom base; and two second screw rods are provided and are in threaded connection with the pit punching bottom base at intervals; and a second driving motor is provided to drive the second screw rod to rotate.

[0011] Preferably, the pitch changing mechanism comprises a horizontally arranged first pitch changing frame; and the first pitch changing frame is provided with a pitch changing linear module; and the pitch changing linear module is provided with a plurality of bearing sliding blocks reciprocating therewith; and the pitch changing linear module drives the plurality of bearing sliding blocks to move closer or apart.

[0012] Preferably, the bottom of the first pitch changing frame is provided with a third sliding rail and a fourth sliding rail at intervals; and the first pitch changing frame is in sliding cooperation with the third sliding rail and the fourth sliding rail; and a third screw rod is in threaded connection with the first pitch changing frame; and a third driving motor is provided to drive the third screw rod to rotate in forward and reverse directions; the rotation of the third screw rod in forward and reverse directions is driven by the third driving motor, so that the first pitch changing frame is driven to reciprocate.

[0013] Compared with the prior art, the aluminum plastic film pit punching device has the advantages that the pit punching mechanism is a core functional component and is responsible for pit punching operation on the aluminum plastic film; the feeding mechanism is responsible for feeding operation of the aluminum plastic film and comprises a vertical feeding stand, a second linear module and two moving mechanisms; the feeding mechanism ensures that the material can smoothly enter the pit punching station; the feeding stand is vertically installed and used for fixing and supporting the aluminum plastic film; the second linear module is horizontally installed on the feeding stand and used for driving synchronous movement of the two moving mechanisms; the first moving mechanism and the second moving mechanism move synchronously with the second linear module; the first moving mechanism moves the aluminum plastic film to the distance changing mechanism, and the second moving mechanism conveys the aluminum plastic film after distance changing to the pit punching mechanism; the distance changing mechanism is used for changing the distance of the aluminum plastic film during feeding, so that the position of the aluminum plastic film is more accurate and the pit punching operation is facilitated.

[0014] Additional aspects and advantages of the present application will be described in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 It is a whole structure schematic diagram of the present application.

[0017] Figure 2 It is another angle structure schematic diagram of the present application Figure 1 .

[0018] Figure 3 It is a stamping block structure schematic diagram of the present application.

[0019] Figure 4 It is a stamping hole structure schematic diagram of the present application.

[0020] Figure 5 It is a second adsorption plate structure schematic diagram of the present application.

[0021] Figure 6 It is a bearing sliding block structure schematic diagram of the present application.

[0022] In the figure: B1, vertical feeding stand; B2, second linear module; B3, first moving frame body; B4, first rotating cylinder; B5, first connecting plate; B6, second lifting cylinder; B7, first adsorption plate; B8, second moving frame body; B9, first driving motor; B10, first screw rod; B11, first sliding rail; B12, second sliding rail; B13, first sliding block; B14, second sliding block; B15, third lifting cylinder; B16, second adsorption plate; B17, punching pit frame; B18, punching pit top base; B19, punching pit bottom base; B20, punching pit motor; B21, mounting block; B22, punching block; B23, punching hole; B24, connecting bottom plate; B25, connecting column; B26, second screw rod; B27, second driving motor; B28, first variable distance frame; B29, variable distance linear module; B30, bearing sliding block; B31, third sliding rail; B32, fourth sliding rail; B33, third screw rod; B34, third driving motor. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second" and the like in the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present disclosure.

[0025] Please refer to Figures 1-6 In the embodiments of the present application, an aluminum plastic film punching pit device comprises a punching pit mechanism; further comprising a feeding mechanism for feeding aluminum plastic film to the punching pit mechanism; and the feeding mechanism comprises a vertical feeding stand B1; and the vertical feeding stand B1 is horizontally provided with a second linear module B2; and a first moving mechanism and a second moving mechanism are provided to move synchronously with the second linear module B2; and a variable distance mechanism is provided, the first moving mechanism feeds the aluminum plastic film to the variable distance mechanism, and then the second moving mechanism moves the aluminum plastic film after variable distance to the punching pit device for punching.

[0026] Specifically, the punching mechanism is the core functional component responsible for the punching operation on the aluminum plastic film; the feeding mechanism is responsible for the feeding operation of the aluminum plastic film, including a vertical feeding stand B1, a second linear module B2, and two moving mechanisms; to ensure that the material can smoothly enter the punching station; the feeding stand B1 is vertically installed and used to fix and support the aluminum plastic film; the second linear module B2 is horizontally installed on the feeding stand B1 and used to drive the synchronous movement of the two moving mechanisms; the first moving mechanism and the second moving mechanism move synchronously with the second linear module B2; wherein the first moving mechanism moves the aluminum plastic film to the distance changing mechanism, and the second moving mechanism transports the aluminum plastic film after changing the distance to the punching mechanism; the distance changing mechanism is used to change the distance of the aluminum plastic film during feeding, so that its position is more accurate and convenient for punching operation; the second linear module B2 can use the existing linear module on the market.

[0027] Further, the first moving mechanism includes a first moving frame B3 that moves synchronously with the second linear module B2; and the bottom of the first moving frame B3 is provided with a first rotary air cylinder B4; and the bottom of the first rotary air cylinder B4 is connected with a first connecting plate B5; and the bottom of the first connecting plate B5 is provided with two second lifting air cylinders B6; and each of the second lifting air cylinders B6 is connected with a plurality of first suction plates B7.

[0028] Specifically, the first moving frame B3 moves synchronously with the second linear module B2, which is the key component for carrying and moving the aluminum plastic film; the first moving frame B3 moves along the track of the linear module to ensure stability and accuracy; the first rotary air cylinder B4 is installed at the bottom of the first moving frame B3 and can rotate to control the position of the aluminum plastic film, so as to more flexibly handle and adjust the angle of the material; the design of the first rotary air cylinder B4 increases the operation flexibility of the device; the first connecting plate B5 is connected to the bottom of the first rotary air cylinder B4 and moves with the first rotary air cylinder B4; the first connecting plate B5 is a structural support point that transmits the movement of the air cylinder to the lower pneumatic system; the second lifting air cylinder B6 is installed at the bottom of the first connecting plate B5; the second lifting air cylinder B6 can move up and down and is used to adjust the height position of the aluminum plastic film to ensure correct positioning of the aluminum plastic film during feeding and distance changing; each second lifting air cylinder B6 is connected with a plurality of first suction plates B7; the first suction plate B7 grasps the aluminum plastic film by vacuum suction or magnetic suction to ensure the stability and accurate positioning of the aluminum plastic film during movement and lifting.

[0029] Further, the second moving mechanism includes a second moving frame B8 that reciprocates synchronously with the second linear module B2; the bottom of the second moving frame B8 is provided with a first driving motor B9; and a first screw B10 connected with the rotating shaft of the first driving motor B9; and the second moving frame B8 is provided with a first sliding rail B11 and a second sliding rail B12 at intervals; and a first sliding block B13 and a second sliding block B14 that rotate with the first screw B10; and the second sliding block B14 and the second sliding block B14 are respectively in sliding cooperation with the first sliding rail B11 and the second sliding rail B12; and the first sliding block B13 and the second sliding block B14 are both connected with a third lifting cylinder B15; and the piston rods of the third lifting cylinders B15 are both connected with a second suction plate B16 in the shape of L in cross section.

[0030] Specifically, the second moving frame B8 moves synchronously with the second linear module B2, which is responsible for transmitting the aluminum plastic film from the variable distance mechanism to the pit forming mechanism; the first driving motor B9 is installed at the bottom of the second moving frame B8, which provides power for the first screw B10 to realize rotary motion; the first screw B10 is driven by the rotating shaft of the first driving motor B9, and cooperates with the first sliding block B13 and the second sliding block B14 to realize precise linear transmission; the function of the first screw B10 is to convert rotary motion into smooth linear movement of the sliding block; the first sliding rail B11 and the second sliding rail B12 are installed on the second moving frame B8 to limit the movement trajectory of the sliding block and ensure its stability; the first sliding rail B11 is in sliding cooperation with the first sliding block B13, and the second sliding rail B12 is in sliding cooperation with the second sliding block B14, thereby forming a double rail system to improve the stability of the overall structure; the first sliding block B13 and the second sliding block B14 are respectively cooperated with the first screw B10 and the corresponding sliding rail to slide along the path of the screw and the sliding rail; the design of the sliding block ensures the accurate positioning of the device during the transmission process; the third lifting cylinder B15 is installed on the first sliding block B13 and the second sliding block B14, and the lifting adjustment of the aluminum plastic film is realized through the up and down movement of the piston rod; the second suction plate B16 is connected at the end of the piston rod of the third lifting cylinder B15, which is in the shape of L in cross section, facilitating the grabbing and fixing of the aluminum plastic film; under the driving of the third lifting cylinder B15, the second suction plate B16 can move up and down to realize accurate grabbing and releasing of the aluminum plastic film.

[0031] Further, the punching mechanism comprises a horizontally arranged punching rack B17; a punching top base B18 and a punching bottom base B19 are arranged in the punching rack B17 in an up-down distribution; two punching motors B20 are arranged at the top of the punching rack B17 in an interval; the rotating shafts of the punching motors B20 are all threadedly connected with mounting blocks B21; a plurality of punching blocks B22 are arranged at the bottom of the mounting blocks B21 in an interval; a plurality of punching holes B23 corresponding to the punching blocks B22 are formed on the punching bottom base B19; the mounting blocks B21 and the punching blocks B22 are driven by the punching motors B20 to move synchronously up and down, so that the punching blocks B22 collide with the punching holes B23 to complete the punching.

[0032] Specifically, the horizontally arranged punching rack B17 is the frame structure of the punching mechanism, which fixes and supports the positions of the punching top base B18 and the punching bottom base B19 to ensure the stability of the whole punching process; the punching top base B18 and the punching bottom base B19 are respectively located at the top and the bottom of the punching rack B17, and are used for fixing and positioning the upper and lower components of the punching operation; the punching motors B20 are installed at the top of the punching rack B17 in an interval; the rotating shaft of each punching motor B20 is threadedly connected with a mounting block B21; the punching motor B20 drives the reciprocating movement of the lead screw through the rotating shaft to drive the mounting block B21 to move up and down, and controls the start and stop of the punching process; a plurality of punching blocks B22 are installed at the bottom of the mounting block B21; the punching blocks B22 are installed at the bottom of the mounting block B21 and are the working components for direct punching; the number and position of the punching blocks B22 correspond to the punching holes B23 on the punching bottom base B19 to realize multi-point synchronous punching; the punching holes B23 are arranged on the punching bottom base B19 and correspond to the punching blocks B22 one by one, and are used for receiving the impact of the punching blocks B22 to complete the punching operation of the aluminum plastic film.

[0033] Further, a connecting bottom plate B24 is arranged below the punching rack B17; a plurality of connecting columns B25 are arranged on the connecting bottom plate B24; the other ends of the connecting columns B25 are all fixedly connected with the punching bottom base B19; two second lead screws B26 threadedly connected with the punching bottom base B19 are arranged in an interval; and a second driving motor B27 is arranged to drive the rotation of the second lead screw B26.

[0034] Specifically, the connecting bottom plate B24 is located below the punching rack B17, providing additional support and fixation for the entire punching mechanism, ensuring the stability of the punching operation; the connecting bottom plate B24 is connected with the punching base B19 through the connecting column B25, playing a role in stabilizing the mechanism; the connecting column B25 is installed between the connecting bottom plate B24 and the punching base B19, distributed at various positions of the bottom plate, used for supporting and fixing the punching base B19; the presence of the connecting column B25 makes the connection between the punching base B19 and the bottom plate more stable, thereby reducing the vibration and deviation that may occur during the punching process, ensuring the precision of the punching; there are two second lead screws B26 distributed at intervals, connected with the punching base B19 through threads; the main function of the second lead screw B26 is to adjust the height of the punching base B19, so as to adjust the aluminum plastic film of different thicknesses or specifications, thereby accurately controlling the distance between the punching block B22 and the punching hole B23; the second driving motor B27 is used to drive the rotation of the second lead screw B26; by controlling the rotation direction and angle of the motor, the second lead screw B26 can adjust the position of the punching base B19 up and down; so that the relative height of the punching block B22 and the punching hole B23 is adjustable, thereby adapting to different processing needs and improving the flexibility of the equipment.

[0035] Further, the variable distance mechanism includes a first variable distance rack B28 arranged horizontally; the first variable distance rack B28 is provided with a variable distance linear module B29; the variable distance linear module B29 is provided with a plurality of bearing sliders B30 reciprocating therewith; and the variable distance linear module B29 drives the plurality of bearing sliders B30 to move closer or apart.

[0036] Specifically, the first variable distance rack B28 is arranged horizontally, providing a support and fixation basis for the overall structure of the variable distance mechanism, ensuring the stability of the variable distance operation; the variable distance linear module B29 is installed on the first variable distance rack B28, which can realize reciprocating motion in the horizontal direction and is the core component for controlling the position and distance change of the slider; the variable distance linear module B29 drives the slider to move through electric or pneumatic driving, thereby realizing accurate distance adjustment; the bearing slider B30 is arranged on the variable distance linear module B29, the number of which matches the bearing demand of the aluminum plastic film; each bearing slider B30 can bear a part of the aluminum plastic film and move closer or apart under the driving of the variable distance linear module B29; the design of the bearing slider B30 ensures that the aluminum plastic film will not deviate or lose stability during movement; wherein the variable distance linear module B29 can adopt the existing variable distance linear module B29 on the market, which will not be described here.

[0037] Further, the bottom of the first variable distance rack B28 is provided with a third sliding rail B31 and a fourth sliding rail B32, the first variable distance rack B28 is in sliding fit with the third sliding rail B31 and the fourth sliding rail B32, a third screw rod B33 is in threaded connection with the first variable distance rack B28, and a third driving motor B34 is arranged to drive the third screw rod B33 to rotate in opposite directions, the rotation of the third driving motor B34 drives the third screw rod B33 to rotate in opposite directions, thereby driving the first variable distance rack B28 to reciprocate.

[0038] Specifically, the third sliding rail B31 and the fourth sliding rail B32 are installed at the bottom of the first variable distance rack B28 and are arranged in a spaced manner to form a double-rail system, the third sliding rail B31 and the fourth sliding rail B32 are designed to ensure the stability and accuracy of the first variable distance rack B28 during movement and avoid lateral deviation or vibration, the third screw rod B33 is in threaded connection with the first variable distance rack B28, and mainly functions to drive the first variable distance rack B28 to move in a horizontal direction on the third sliding rail B31 and the fourth sliding rail B32 by rotation, the third screw rod B33 converts the rotary motion into linear motion to ensure that the rack stably reciprocates on a predetermined path, and the third driving motor B34 is used to drive the third screw rod B33 to rotate in opposite directions, the third screw rod B33 can drive the first variable distance rack B28 to move forward and backward by controlling the rotation direction and angle of the motor, so as to realize the reciprocating motion of the whole rack, and the third driving motor B34 provides a power source for the adjustment of the variable distance mechanism to ensure flexible adjustment in different production scenarios.

[0039] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. An alufoil puncturing apparatus comprising a puncturing mechanism; characterised in that, The aluminum plastic film feeding mechanism for the pit punching mechanism is also provided; the feeding mechanism comprises a vertical feeding stand (B1); a second linear module (B2) is horizontally arranged on the feeding stand (B1); a first moving mechanism and a second moving mechanism are arranged to move synchronously with the second linear module (B2); and a distance changing mechanism is arranged; the aluminum plastic film is fed to the distance changing mechanism through the first moving mechanism, and then the aluminum plastic film is moved to the pit punching device through the second moving mechanism after the distance is changed.

2. An Al-PET film punching device according to claim 1, characterized in that, The first moving mechanism comprises a first moving frame (B3) moving synchronously with the second linear module (B2); and a first rotary air cylinder (B4) is arranged at the bottom of the first moving frame (B3); a first connecting plate (B5) is connected to the bottom of the first rotary air cylinder (B4); two second lifting air cylinders (B6) are arranged at the bottom of the first connecting plate (B5); and a plurality of first adsorption plates (B7) are connected to the second lifting air cylinders (B6).

3. An Al-PET film punching device according to claim 2, characterized in that, The second moving mechanism comprises a second moving frame (B8) reciprocating synchronously with the second linear module (B2); a first driving motor (B9) is arranged at the bottom of the second moving frame (B8); a first screw rod (B10) is connected to the rotating shaft of the first driving motor (B9); first and second sliding rails (B11, B12) are arranged at intervals on the second moving frame (B8); first and second sliding blocks (B13, B14) are arranged to rotate with the first screw rod (B10); the first and second sliding blocks (B13, B14) are arranged to slide with the first and second sliding rails (B11, B12) respectively; third lifting air cylinders (B15) are connected to the first and second sliding blocks (B13, B14); and second adsorption plates (B16) with an L-shaped cross section are connected to the piston rods of the third lifting air cylinders (B15).

4. The device according to claim 1, wherein The pit punching mechanism comprises a horizontally arranged pit punching frame (B17); a pit punching top seat (B18) and a pit punching bottom seat (B19) are arranged at intervals in the pit punching frame (B17); two pit punching motors (B20) are arranged at intervals at the top of the pit punching frame (B17); mounting blocks (B21) are connected to the rotating shafts of the pit punching motors (B20) through screw threads; a plurality of stamping blocks (B22) are arranged at intervals at the bottom of the mounting blocks (B21); a plurality of stamping holes (B23) corresponding to the stamping blocks (B22) are formed on the pit punching bottom seat (B19); the pit punching motors (B20) drive the mounting blocks (B21) and the stamping blocks (B22) to move synchronously up and down, so that the stamping blocks (B22) collide with the stamping holes (B23) to complete the pit punching.

5. An Al-PET film punching device according to claim 4, characterized in that, A connecting bottom plate (B24) is arranged below the pit punching frame (B17); a plurality of connecting columns (B25) are arranged on the connecting bottom plate (B24); the other ends of the connecting columns (B25) are fixedly connected with the pit punching bottom seat (B19); two second screw rods (B26) are arranged at intervals and are threadedly connected with the pit punching bottom seat (B19); and a second driving motor (B27) is arranged to drive the second screw rod (B26) to rotate.

6. The device according to claim 1, wherein The variable distance mechanism comprises a horizontally arranged first variable distance frame (B28); the first variable distance frame (B28) is provided with a variable distance linear module (B29); the variable distance linear module (B29) is provided with a plurality of bearing sliders (B30) reciprocating therewith; and the variable distance linear module (B29) drives the plurality of bearing sliders (B30) to move closer or apart.

7. An Al-PET punching device according to claim 6, characterized in that, The bottom of the first variable distance frame (B28) is provided with a third sliding rail (B31) and a fourth sliding rail (B32) at intervals; the first variable distance frame (B28) is in sliding cooperation with the third sliding rail (B31) and the fourth sliding rail (B32); a third screw rod (B33) is provided in threaded connection with the first variable distance frame (B28); a third driving motor (B34) is provided for driving the third screw rod (B33) to rotate in opposite directions; the third driving motor (B34) drives the screw rod to rotate in opposite directions, thereby driving the first variable distance frame (B28) to reciprocate.

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