A plastic part water gap punching machine for realizing double material synchronous separation

Abstract

The application provides a plastic part water gap punching machine realizing double-material synchronous separation, which comprises a base plate, a workbench, a feeding rack, a limiting baffle, a driving mechanism, a grabbing mechanism, a punching mechanism, a connecting mechanism and a material placing die. When the device is used, the bottom plastic part on the feeding rack is pushed to a predetermined position through the driving mechanism, meanwhile, the plastic part is limited through the limiting baffle, the un-punched plastic part and the punched plastic part are synchronously grabbed through the grabbing mechanism, the plastic part is moved in, punched and moved out through the cooperation of the punching mechanism and the connecting mechanism, the synchronous taking out of the punched plastic part and the putting in of the un-punched plastic part is realized, the overall processing efficiency of the plastic part is improved, and the moving in, punching and moving out of the plastic part are realized through one power source, so that the processing cost of the plastic part is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic part water port punching, in particular to a plastic part water port punching machine realizing synchronous separation of double materials. BACKGROUND

[0002] In the process of plastic part processing, in order to realize the separation of double materials in the plastic part, a water port punching machine is usually used for punching processing of the plastic part. There are many types of existing plastic part water port punching machines, including a plastic part water port punching machine that uses a mechanical hand to grab and unload. The operation steps are as follows: the mechanical hand places the plastic part on the material placing mold, the slide table moves the plastic part on the material placing mold to the lower part of the punching mechanism, the punching mechanism punches the plastic part to realize the separation of double materials in the plastic part, then the slide table moves the punched plastic part out, the mechanical hand takes out the punched plastic part, then the mechanical hand places the un-punched plastic part on the material placing mold, and the operation is repeated to punch the plastic part. In this process, the taking out of the punched plastic part and the placing of the un-punched plastic part are operated at different times, the overall processing efficiency of the plastic part is low, and the moving in, punching and moving out of the plastic part are driven by two power sources, resulting in high processing cost of the plastic part.

[0003] Therefore, it is necessary to provide a new plastic part water port punching machine realizing synchronous separation of double materials to solve the above technical problems. SUMMARY

[0004] To solve the above technical problems, the present application provides a plastic part water port punching machine realizing synchronous separation of double materials.

[0005] The plastic part water port punching machine realizing synchronous separation of double materials provided by the present application comprises: a plastic part water port punching machine realizing synchronous separation of double materials, which comprises a base plate, a workbench, a material placing rack, a limiting baffle, a driving mechanism, a grabbing mechanism, a punching mechanism, a connecting mechanism and a material placing mold. The upper surface of the base plate is provided with the workbench, the surface of the workbench is fixedly connected with the material placing rack, the surface of the workbench is fixedly connected with the limiting baffle, the surface of the workbench is fixedly connected with the driving mechanism, the upper surface of the base plate is fixedly connected with the grabbing mechanism, the surface of the workbench is fixedly connected with the punching mechanism, the surface of the workbench is slidingly connected with the connecting mechanism, and the upper part of the workbench is provided with the material placing mold.

[0006] Preferably, the driving mechanism comprises a fixed block, an electric push rod and a push plate. The surface of the workbench is fixedly connected with the fixed block, the inside of the fixed block is fixedly connected with the electric push rod, the output end of the electric push rod is fixedly connected with the push plate, and the push plate is slidingly connected with the workbench. The electric push rod is started, the output end of the electric push rod is retracted to drive the push plate to move, and the push plate pushes the bottom plastic part on the material placing rack to a predetermined position.

[0007] Preferably, the grabbing mechanism comprises a first support frame, a linear motor, a first fixed plate, a first cylinder, a second fixed plate, a first limiting rod and a vacuum suction cup, the upper surface of the base plate is fixedly connected with the first support frame, the surface of the first support frame is fixedly connected with the linear motor, the output end of the linear motor is fixedly connected with the first fixed plate, the surface of the first fixed plate is fixedly connected with the first cylinder, the output end of the first cylinder is fixedly connected with the second fixed plate, the surface of the second fixed plate close to the first fixed plate is fixedly connected with the first limiting rod, the two first limiting rods are slidingly connected with the first fixed plate, the surface of the second fixed plate away from the first fixed plate is fixedly connected with the vacuum suction cup, the linear motor is started, the output end of the linear motor moves to drive the first fixed plate to move, so that the first cylinder, the second fixed plate and the vacuum suction cup move to a predetermined position, the first cylinder is started, the output end of the first cylinder is elongated to move the two vacuum suction cups to a predetermined position, and the un-punched plastic parts and the punched plastic parts are grabbed respectively.

[0008] Preferably, the punching mechanism comprises a second support frame, a second cylinder, a connecting plate, a punching cutter and a second limiting rod, the surface of the workbench is fixedly connected with the second support frame, the surface of the second support frame is fixedly connected with the second cylinder, the output end of the second cylinder is fixedly connected with the connecting plate, the surface of the connecting plate away from the second cylinder is fixedly connected with the punching cutter, and the surface of the connecting plate away from the second cylinder is fixedly connected with the second limiting rod, the two second limiting rods are slidingly connected with the second support frame, the second cylinder is started, the output end of the second cylinder is elongated to drive the connecting plate and the punching cutter to move downward, and the plastic parts are punched by the punching cutter.

[0009] Preferably, the connecting mechanism comprises a sliding plate, a support plate, a shell, a spring, a connecting block and a fixed rod, the surface of the workbench is slidingly connected with two sliding plates, the two sliding plates are fixedly connected with the support plate, the support plate is fixedly connected with the material placing mold, and the support plate is slidingly connected with the workbench, the surface of the sliding plate is slidingly connected with the shell, the inner bottom surface of the shell is fixedly connected with the spring, the inner wall of the shell is slidingly connected with the connecting block, the connecting block is fixedly connected with the spring, the inner wall of the shell is slidingly connected with the fixed rod, the fixed rod is fixedly connected with the connecting block, and the two fixed rods are fixedly connected with the connecting plate, the connecting plate moves downward to drive the fixed rod to move downward, so that the plastic parts move to a predetermined position below the punching cutter.

[0010] Preferably, the upper surface of the base plate is provided with a first collecting frame, and the surface of the workbench is provided with a second collecting frame, the punched plastic parts are collected through the first collecting frame, and the punched materials are collected through the second collecting frame.

[0011] Preferably, the surface of the sliding plate is provided with a sliding groove, and the sliding groove is slidingly connected with the shell, so as to facilitate the movement of the material placing mold.

[0012] Preferably, the surface of the support plate is symmetrically provided with a first through hole, so that the punched material falls into the second material collecting frame.

[0013] Preferably, the surface of the material placing mold is symmetrically provided with a second through hole, and the surface of the material placing mold is provided with a material placing groove, so that the punched material falls into the second material collecting frame through the second through hole, and the un-punched plastic part is placed through the material placing groove.

[0014] Preferably, the surface of the first support frame is fixedly connected with an operation panel, so as to control the operation of the device and check the number of plastic parts processed.

[0015] Preferably, the surface of the first support frame is fixedly connected with a lighting lamp, so as to illuminate the feeding rack at night.

[0016] Compared with the related art, the plastic part water gap punching machine for realizing double-material synchronous separation has the following beneficial effects:

[0017] When the present application is used, the plastic part is placed on the feeding rack, the electric push rod is started to push the bottom plastic part on the feeding rack to a predetermined position, the plastic part is limited by the limiting baffle, the linear motor is started to move the first cylinder, the second fixed plate and the vacuum chuck to a predetermined position, the first cylinder is started to move the vacuum chuck to a predetermined position to grab the plastic part, the connecting plate and the punching tool are moved downward by starting the second cylinder, the fixed rod is moved downward by the downward movement of the connecting plate, the plastic part is moved to a predetermined position below the punching tool, at this time, the punching tool is above the plastic part, the spring is compressed by the continuous downward movement of the punching tool, the plastic part is punched by the punching tool, the punched material falls into the second material collecting frame through the second through hole and the first through hole, the material placing mold is moved to the original position by the contraction of the output end of the second cylinder, the linear motor and the first cylinder are started in sequence to move the two vacuum chucks to a predetermined position to grab the un-punched plastic part and the punched plastic part, the punched plastic part is taken out and placed in the first material collecting frame, the un-punched plastic part is placed in the material placing groove, and the above operation is repeated to automatically punch and process the plastic part, so that the punched plastic part is taken out and the un-punched plastic part is placed in synchronously, the overall processing efficiency of the plastic part is improved, and the plastic part is moved in, punched and moved out by one power source, so that the processing cost of the plastic part is saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall structure schematic diagram provided by the present application is provided;

[0019] Figure 2 The substrate structure schematic diagram provided by the present application is provided;

[0020] Figure 3 A workbench structure schematic diagram provided by the present application;

[0021] Figure 4 A first support frame structure schematic diagram provided by the present application;

[0022] Figure 5 A second support frame structure schematic diagram provided by the present application;

[0023] Figure 6 A support plate structure schematic diagram provided by the present application;

[0024] Figure 7 A shell cross-section structure schematic diagram provided by the present application;

[0025] Figure 8 A material placement mold structure schematic diagram provided by the present application.

[0026] Reference signs in the figure: 1, base plate; 2, workbench; 3, material placing rack; 4, limiting baffle; 5, driving mechanism; 6, grabbing mechanism; 7, punching mechanism; 8, connecting mechanism; 9, material placement mold; 10, fixed block; 11, electric push rod; 12, push plate; 13, first support frame; 14, linear motor; 15, first fixed plate; 16, first air cylinder; 17, second fixed plate; 18, first limiting rod; 19, vacuum chuck; 20, second support frame; 21, second air cylinder; 22, connecting plate; 23, punching cutter; 24, second limiting rod; 25, sliding plate; 26, support plate; 27, shell; 28, spring; 29, connecting block; 30, fixed rod; 31, first material collecting frame; 32, second material collecting frame; 33, sliding groove; 34, first through hole; 35, second through hole; 36, material placement groove; 37, operation panel; 38, illuminating lamp. DETAILED DESCRIPTION

[0027] The present application will be further described below in combination with the accompanying drawings and embodiments.

[0028] Embodiment 1

[0029] In the specific implementation process, for example, Figure 1 and Figure 2The utility model discloses a plastic part water gap punching machine of realizing double material synchronous separation, including base plate 1, workstation 2, material rack 3, limiting baffle 4, drive mechanism 5, grabbing mechanism 6, punching mechanism 7, connecting mechanism 8 and material placement mould 9, the upper surface of base plate 1 places workstation 2, the surface fixed connection of workstation 2 has material rack 3, the surface fixed connection of workstation 2 has limiting baffle 4, the surface fixed connection of workstation 2 has drive mechanism 5, the upper surface fixed connection of base plate 1 has grabbing mechanism 6, the surface fixed connection of workstation 2 has punching mechanism 7, the surface sliding connection of workstation 2 has connecting mechanism 8, and the top of workstation 2 is provided with material placement mould 9.

[0030] Please refer to Figure 1 、 Figure 2 and Figure 3 , drive mechanism 5 includes fixed block 10, electric push rod 11 and push plate 12, the surface fixed connection of workstation 2 has fixed block 10, the inside fixed connection of fixed block 10 has electric push rod 11, and the output end fixed connection of electric push rod 11 has push plate 12, and push plate 12 is slidably connected with workstation 2;

[0031] It should be noted that starting electric push rod 11, the output end of electric push rod 11 is retracted to drive push plate 12 to move, and the bottom plastic part on material rack 3 is pushed to the predetermined position through push plate 12.

[0032] Please refer to Figure 1 and Figure 4 , grabbing mechanism 6 includes first support frame 13, linear motor 14, first fixed plate 15, first cylinder 16, second fixed plate 17, first limiting rod 18 and vacuum chuck 19, the upper surface fixed connection of base plate 1 has first support frame 13, the surface fixed connection of first support frame 13 has linear motor 14, the output end fixed connection of linear motor 14 has first fixed plate 15, the surface fixed connection of first fixed plate 15 has first cylinder 16, the output end fixed connection of first cylinder 16 has second fixed plate 17, and the surface of second fixed plate 17 close to first fixed plate 15 is fixedly connected with first limiting rod 18, and the two first limiting rods 18 are slidably connected with first fixed plate 15, and the surface of second fixed plate 17 away from first fixed plate 15 is fixedly connected with vacuum chuck 19;

[0033] It should be noted that starting linear motor 14, the output end of linear motor 14 moves to drive first fixed plate 15 to move, so that first cylinder 16, second fixed plate 17 and vacuum chuck 19 move to the predetermined position, starting first cylinder 16, the output end of first cylinder 16 is elongated, so that two vacuum chucks 19 move to the predetermined position, and the uncut plastic part and the cut plastic part are grabbed respectively, realize the synchronization of the cut plastic part taking out and the uncut plastic part putting in.

[0034] Please refer toFigure 1 、 Figure 2 、 Figure 3 and Figure 5 , the punching mechanism 7 includes a second support frame 20, a second cylinder 21, a connecting plate 22, a punching tool 23 and a second limiting rod 24, the surface of the workbench 2 is fixedly connected with the second support frame 20, the surface of the second support frame 20 is fixedly connected with the second cylinder 21, the output end of the second cylinder 21 is fixedly connected with the connecting plate 22, the surface of the connecting plate 22 away from the second cylinder 21 is fixedly connected with the punching tool 23, and the surface of the connecting plate 22 away from the second cylinder 21 is fixedly connected with the second limiting rod 24, and the two second limiting rods 24 are in sliding connection with the second support frame 20;

[0035] It should be noted that the second cylinder 21 is started, the output end of the second cylinder 21 is elongated to drive the connecting plate 22 and the punching tool 23 to move downward, and the plastic part is punched by the punching tool 23.

[0036] Please refer to Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 and Figure 7 , the connecting mechanism 8 includes a sliding plate 25, a supporting plate 26, a shell 27, a spring 28, a connecting block 29 and a fixed rod 30, the surface of the workbench 2 is slidably connected with the sliding plate 25, and there are two sliding plates 25, the two sliding plates 25 are fixedly connected with the supporting plate 26, the supporting plate 26 is fixedly connected with the material placing mold 9, and the supporting plate 26 is slidably connected with the workbench 2, the surface of the sliding plate 25 is slidably connected with the shell 27, the inner bottom surface of the shell 27 is fixedly connected with the spring 28, the inner wall of the shell 27 is slidably connected with the connecting block 29, the connecting block 29 is fixedly connected with the spring 28, the inner wall of the shell 27 is slidably connected with the fixed rod 30, and the fixed rod 30 is fixedly connected with the connecting block 29; the two fixed rods 30 are fixedly connected with the connecting plate 22;

[0037] It should be noted that the elastic force of the spring 28 is greater than the frictional force between the sliding plate 25 and the workbench 2 and between the supporting plate 26 and the workbench 2, the connecting plate 22 is driven to move downward to drive the fixed rod 30 to move downward, the fixed rod 30 is driven to move downward to drive the shell 27 to move downward, the shell 27 is driven to move downward to drive the sliding plate 25 to move, the sliding plate 25 is driven to move to drive the supporting plate 26 to move, and the supporting plate 26 is driven to move to drive the material placing mold 9 to move, so that the plastic part moves to the predetermined position below the punching tool 23.

[0038] Please refer to Figure 1 、 Figure 2 and Figure 3 , the upper surface of the base plate 1 is provided with a first material collecting frame 31, and the surface of the workbench 2 is provided with a second material collecting frame 32;

[0039] It needs to be explained that the first collecting frame 31 is used for collecting the plastic parts after punching and cutting, and the second collecting frame 32 is used for collecting the materials after punching and cutting.

[0040] Please refer to Figure 6 The surface of the sliding plate 25 is provided with a sliding groove 33, and the sliding groove 33 is in sliding connection with the shell 27.

[0041] It needs to be explained that the sliding groove 33 is inclined to the horizontal plane, which is convenient for the material to be placed in the mold 9 to move.

[0042] Please refer to Figure 6 The surface of the supporting plate 26 is provided with a first through hole 34.

[0043] It needs to be explained that the first through hole 34 is used for the material after punching and cutting to fall into the second collecting frame 32.

[0044] Please refer to Figure 8 The surface of the material placing mold 9 is provided with a second through hole 35, and the surface of the material placing mold 9 is provided with a material placing groove 36.

[0045] It needs to be explained that the second through hole 35 is used for the material after punching and cutting to fall into the second collecting frame 32, and the material placing groove 36 is used for the placement of the plastic parts that have not been punched and cut.

[0046] Please refer to Figure 1 The surface of the first supporting frame 13 is fixedly connected with an operation panel 37, and the surface of the first supporting frame 13 is fixedly connected with a lighting lamp 38.

[0047] It needs to be explained that the operation panel 37 is used for controlling the operation of the device, and the number of plastic parts processed can be checked, and the lighting lamp 38 is used for lighting at night when the light is dark, which is convenient for feeding the feeding rack 3.

[0048] The use method of the punching machine comprises the following steps:

[0049] First, the plastic parts are placed on the feeding rack 3, the bottom plastic parts on the feeding rack 3 are pushed to the predetermined position by the driving mechanism 5, then the plastic parts are grabbed by the grabbing mechanism 6 and placed in the material placing groove 36, the punching and cutting mechanism 7 and the connecting mechanism 8 are used in cooperation to realize the moving in, punching and cutting and moving out of the plastic parts, and then the grabbing mechanism 6 is used to take out the plastic parts after punching and cutting and put in the plastic parts that have not been punched and cut, and the above operation is repeated to realize the automatic punching and cutting of the plastic parts.

[0050] Working principle: in use, the plastic parts are placed on the material placing frame 3, the electric push rod 11 is started, the output end of the electric push rod 11 is retracted to drive the push plate 12 to move, the bottom plastic parts on the material placing frame 3 are pushed to the predetermined position through the push plate 12, and the plastic parts are limited through the limiting baffle 4, the linear motor 14 is started, the output end of the linear motor 14 moves to drive the first fixed plate 15 to move, so that the first air cylinder 16, the second fixed plate 17 and the vacuum chuck 19 move to the predetermined position, the first air cylinder 16 is started, the output end of the first air cylinder 16 is elongated, so that the vacuum chuck 19 moves to the predetermined position, the plastic parts are grabbed, after the grabbed plastic parts are placed in the material placing groove 36, the second air cylinder 21 is started, the output end of the second air cylinder 21 is elongated to drive the connecting plate 22 and the punching cutter 23 to move downward, the connecting plate 22 moves downward to drive the fixed rod 30 to move downward, the fixed rod 30 moves downward to drive the shell 27 to move downward, the shell 27 moves downward to drive the sliding plate 25 to move, the sliding plate 25 moves to drive the supporting plate 26 to move, the supporting plate 26 moves to drive the material placing die 9 to move, so that the plastic parts move to the predetermined position below the punching cutter 23, at this time, the punching cutter 23 is above the plastic parts, the output end of the second air cylinder 21 continues to elongate, the spring 28 is compressed, the plastic parts are punched through the punching cutter 23, the punched material falls into the second material collecting frame 32 through the second through hole 35 and the first through hole 34, the output end of the second air cylinder 21 is retracted to drive the connecting plate 22 and the punching cutter 23 to move upward, so that the material placing die 9 moves to the original position, the linear motor 14 is started to move the vacuum chuck 19 to the predetermined position, the first air cylinder 16 is started to move the two vacuum chucks 19 to the predetermined position, the un-punched plastic parts and the punched plastic parts are grabbed respectively, the punched plastic parts are taken out and placed in the first material collecting frame 31, the un-punched plastic parts are placed in the material placing groove 36, and the above operation is repeated to automatically punch the plastic parts.

[0051] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent flow transformation made by using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A plastic part water gate punching machine for realizing double material synchronous separation, comprising: The utility model relates to a material placing die (9) is provided on the upper surface of the base plate (1), the workbench (2) is placed on the upper surface of the base plate (1), the material rack (3) is fixedly connected to the surface of the workbench (2), the limiting baffle (4) is fixedly connected to the surface of the workbench (2), the driving mechanism (5) is fixedly connected to the surface of the workbench (2), the grabbing mechanism (6) is fixedly connected to the upper surface of the base plate (1), the punching mechanism (7) is fixedly connected to the surface of the workbench (2), the connecting mechanism (8) is slidably connected to the surface of the workbench (2), and the material placing die (9) is arranged above the workbench (2); The grabbing mechanism (6) includes a first support frame (13), a linear motor (14), a first fixed plate (15), a first cylinder (16), a second fixed plate (17), a first limiting rod (18) and a vacuum chuck (19), the upper surface of the base plate (1) is fixedly connected with the first support frame (13), the surface of the first support frame (13) is fixedly connected with the linear motor (14), the output end of the linear motor (14) is fixedly connected with the first fixed plate (15), the surface of the first fixed plate (15) is fixedly connected with the first cylinder (16), the output end of the first cylinder (16) is fixedly connected with the second fixed plate (17), the surface of the second fixed plate (17) close to the first fixed plate (15) is fixedly connected with the first limiting rod (18) in pairs of symmetry, both the first limiting rods (18) are slidably connected with the first fixed plate (15), and the surface of the second fixed plate (17) away from the first fixed plate (15) is fixedly connected with the vacuum chuck (19) in pairs of symmetry; The punching mechanism (7) includes a second support frame (20), a second cylinder (21), a connecting plate (22), a punching cutter (23) and a second limiting rod (24), the surface of the workbench (2) is fixedly connected with the second support frame (20), the surface of the second support frame (20) is fixedly connected with the second cylinder (21), the output end of the second cylinder (21) is fixedly connected with the connecting plate (22), the surface of the connecting plate (22) away from the second cylinder (21) is fixedly connected with the punching cutter (23), the surface of the connecting plate (22) away from the second cylinder (21) is fixedly connected with the second limiting rod (24) in pairs of symmetry, and both the second limiting rods (24) are slidably connected with the second support frame (20); The connecting mechanism (8) comprises a sliding plate (25), a supporting plate (26), a shell (27), a spring (28), a connecting block (29) and a fixing rod (30), the surface of the workbench (2) is slidably connected with the sliding plate (25), and the sliding plate (25) is two, the two sliding plates (25) are fixedly connected with the supporting plate (26), the supporting plate (26) is fixedly connected with the material placing mold (9), the supporting plate (26) is slidably connected with the workbench (2), the surface of the sliding plate (25) is slidably connected with the shell (27), the inner bottom surface of the shell (27) is fixedly connected with the spring (28), the inner wall of the shell (27) is slidably connected with the connecting block (29), the connecting block (29) is fixedly connected with the spring (28), the inner wall of the shell (27) is slidably connected with the fixing rod (30), and the fixing rod (30) is fixedly connected with the connecting block (29), and the two fixing rods (30) are fixedly connected with the connecting plate (22).

2. The plastic part water port punching machine for realizing double material synchronous separation according to claim 1, characterized in that, The driving mechanism (5) comprises a fixed block (10), an electric push rod (11) and a push plate (12), the surface of the workbench (2) is fixedly connected with the fixed block (10), the inner portion of the fixed block (10) is fixedly connected with the electric push rod (11), the output end of the electric push rod (11) is fixedly connected with the push plate (12), and the push plate (12) is slidably connected with the workbench (2).

3. The plastic part water port punching machine for realizing double material synchronous separation according to claim 1, characterized in that, The upper surface of the base plate (1) is provided with a first material collecting frame (31), and the surface of the workbench (2) is provided with a second material collecting frame (32).

4. The plastic part water port punching machine for realizing double material synchronous separation according to claim 1, characterized in that, The surface of the sliding plate (25) is provided with a sliding groove (33), and the sliding groove (33) is slidably connected with the shell (27).

5. The plastic part water port punching machine for realizing double material synchronous separation according to claim 1, characterized in that, The surface of the supporting plate (26) is symmetrically provided with a first through hole (34).

6. The plastic part water port punch cutting machine for realizing double material synchronous separation according to claim 1, characterized in that, The surface of the material placing mold (9) is symmetrically provided with a second through hole (35), and the surface of the material placing mold (9) is provided with a material placing groove (36).

7. The plastic part water port punch cutting machine for realizing double material synchronous separation according to claim 1, characterized in that, The surface of the first supporting frame (13) is fixedly connected with an operation panel (37).

8. The plastic part water port punch cutting machine for realizing double material synchronous separation according to claim 1, characterized in that, The surface of the first supporting frame (13) is fixedly connected with an illuminating lamp (38).

9. The method of using a plastic part water port punch cutting machine for achieving double material synchronous separation according to any one of claims 1-8, characterized in that, The method comprises the following steps: First, the plastic parts are placed on the material placing frame (3), the bottom plastic parts on the material placing frame (3) are pushed to the predetermined position through the driving mechanism (5), then the plastic parts are grabbed and placed in the material placing groove (36) through the grabbing mechanism (6), the plastic parts are moved in, punched and moved out through the cooperation of the punching mechanism (7) and the connecting mechanism (8), the punched plastic parts are taken out and the un-punched plastic parts are put in through the grabbing mechanism (6) at the same time, the above operation is repeated, and the automatic punching of the plastic parts is realized.

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