Film covering device and film covering method for V-method casting

Abstract

The invention discloses a film covering device and method for V-method casting. The device comprises a film frame and a film tearing assembly, and the film tearing assembly comprises a front end clamping piece and a rear end clamping piece; the two clamping plates move the clamped plastic film in the A direction and exceed the position of the rotating shaft, the rack pushes the gear to rotate through the position of the gear, the two corresponding clamping rods rotate oppositely along with the gear to clamp and fix the plastic film, and the clamping plates return to the original position again to clamp the plastic film. Power is provided for rotation of the rotating shaft by pulling the plastic film through the clamping plates, the two corresponding clamping rods rotate oppositely along with the clamping plates to clamp and fix the plastic film, the two clamping plates return to the original positions again to clamp the plastic film again under the auxiliary action of the driving part, and the situation that the end of the plastic film is adsorbed by static electricity due to cutting is avoided; and the end part of the plastic film does not need to be found again, so that the working efficiency of the film laminating device is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of V-method casting, and in particular relates to a coating device for V-method casting, and a coating method for the coating device for V-method casting. Background Art

[0002] V-casting, also known as vacuum sealing molding or negative pressure molding, is an advanced physical molding method. It uses a plastic film to seal the sand box and uses a vacuum pump to extract the air in the mold, forming a pressure difference inside and outside the mold to compact the dry sand and form the required cavity. The film coating device not only needs to seal the sand box, but also needs to be tightly attached to the pattern plate.

[0003] When the laminating device is applying close contact to the template, the plastic film is first pulled out from the winding roller position piece to the bottom piece of the film frame and fixed. After the plastic film is cut, it is heated using a film dryer until the plastic film is softened. Then the film frame descends to attach the plastic film to the template and a vacuum method is used to make the plastic film and the mold closely adhere.

[0004] However, after the plastic film is cut, the end piece will be adsorbed on the surface of the untorn plastic film due to static electricity, and the feeding work cannot be continued. The user needs to find it again, which is very inconvenient to use and affects the laminating work of the laminating device. Summary of the invention

[0005] The present invention aims to solve the problem in the prior art that the ends of the plastic film will be adsorbed by static electricity after being cut and need to be found again, and proposes the following technical solution:

[0006] The coating device for V-method casting comprises:

[0007] A film frame, which is located between the film drying device and the template and is used to fix the cut plastic film;

[0008] A film-tearing assembly, the film-tearing assembly includes a front-end clamping member and a rear-end clamping member, the front-end clamping member includes two clamping plates that reciprocate in the A direction and the B direction, the rear-end clamping member includes two rotating shafts that rotate in opposite directions, the rotating shafts are equipped with clamping rods through a connecting frame, one end of the clamping plate is provided with a rack, and the surface of the rotating shaft is provided with a gear that matches the rack;

[0009] The two clamping plates move the clamped plastic film in direction A and exceed the position of the rotating shaft. The rack passes through the gear position and pushes it to rotate. The rotating shaft at the top piece rotates clockwise, and the rotating shaft at the bottom piece rotates counterclockwise. The two corresponding clamping rods rotate toward each other to clamp and fix the plastic film, and the clamping plates return to their original positions to clamp the plastic film again.

[0010] As a preferred embodiment of the above technical solution, the film tearing assembly also includes a driving member, which includes two track frames that move toward each other, and a movable slider is movably inserted in the track frame, and the two movable sliders are sleeved on the surface of the same pushing frame. The pushing frame drives the two clamping plates in direction A through the two movable sliders to pull and extend the plastic film. After the two clamping rods clamp the plastic film, the two track frames drive the corresponding clamping plates to move in the opposite direction to release the plastic film and make it leave the rear end clamping member position, and then the pushing frame resets the two clamping plates in direction B, and the two track frames move toward each other accordingly so that the two clamping plates return to their original positions to clamp the plastic film.

[0011] As a preferred embodiment of the above technical solution, the rear-end clamping member also includes two mounting blocks, the mounting blocks and the track frame are respectively located at both ends of the rotating shaft, the mounting blocks are fixedly mounted on the external mounting frame, one end of the rotating shaft is rotatably inserted into the corresponding mounting block, and a torsion spring is arranged between the rotating shaft and the mounting block.

[0012] As a preferred embodiment of the above technical solution, the rear end clamping member also includes two one-way limit members, the one-way limit members are located in the corresponding mounting block, the one-way limit members include a ratchet and a plurality of pawls, the ratchet shaft is coaxially fixedly connected with the corresponding rotating shaft, one end of the pawl is inserted into the tooth groove of the ratchet, and the other end of the pawl is provided with a torsion spring between the rotating part and the mounting block.

[0013] As a preferred embodiment of the above technical solution, the rear end clamping part also includes two disconnecting parts, which include a plug-in block, which is movably plugged between the rotating shaft and the pawl rotating shaft, a moving rod is provided at one end of the plug-in block, a return spring is sleeved on the surface of the moving rod, one end of the moving rod passes through the mounting block and extends to the outside, and a push rod is provided at one end of the moving rod.

[0014] As a preferred embodiment of the above technical solution, a magnetic block is arranged at one end of the moving rod, and magnetic pole surfaces with different magnetic properties are arranged at both ends of the plug-in block.

[0015] As a preferred embodiment of the above technical solution, one end of the push rod is located at the bottom of the track frame. After the clamping plate is reset, the two track frames continue to move toward each other to push the track frame to move so that the moving rod drives the plug-in block to leave the rotating shaft and the pawl rotating shaft position.

[0016] As a preferred embodiment of the above technical solution, the front end clamping member also includes two retracting members, the retracting member includes a storage block, one end of the storage block is fixedly connected to the movable slider, one end of the clamping plate is movably inserted in the storage block, and the clamping plate and the storage block are fixedly connected by multiple connecting springs.

[0017] As a preferred embodiment of the above technical solution, a soft rubber layer is provided on the surface of the clamping rod, and the surface of the soft rubber layer of the clamping rod is rough.

[0018] The coating method of the coating device for V-method casting comprises the following steps:

[0019] S1, pull the plastic film;

[0020] The two clamping plates move the clamped plastic film in the A direction and beyond the position of the rotating axis, and part of the plastic film on the winding roller is then pulled to the bottom of the film frame;

[0021] S2, clamping and fixing at the rear end;

[0022] The rack drives the gear to rotate as the clamping plate passes through the gear position, and the two corresponding clamping rods rotate toward each other to clamp and fix the plastic film;

[0023] S3, front end clamping and fixing;

[0024] The two clamping plates return to their original positions to clamp the plastic film, and then the film frame moves down to fit the surface of the plastic film;

[0025] S4, heating and laminating;

[0026] The plastic film is fixed on the film frame, and after the end of the plastic film is cut, it is heated using a film dryer. After the heating is completed, the film frame is used to attach the plastic film to the template.

[0027] The beneficial effects of the present invention are:

[0028] 1. The clamping plate pulls the plastic film to provide power for the rotation of the rotating shaft, and the two corresponding clamping rods rotate toward each other to clamp and fix the plastic film. With the assistance of the driving member, the two clamping plates return to their original positions to clamp the plastic film again, so as to avoid the end of the plastic film being adsorbed by static electricity due to cutting, and there is no need to find the end of the plastic film again, thereby ensuring the working efficiency of the laminating device;

[0029] 2. The one-way limiter can block the path of the rotating shaft to reset, preventing the clamping rod from moving in the opposite direction under the action of external force when the rack leaves the gear position, thereby ensuring the clamping and fixing effect of the clamping rod on the plastic film;

[0030] 3. The disconnecting piece can disconnect the connection between the rotating shaft and the one-way limiter, and the rotating shaft can automatically reset under the action of its torsion spring, without the need to manually adjust the rear end clamping piece, and after the automatic adjustment of the end clamping piece is completed, the rotating shaft and the one-way limiter are reconnected, which is more convenient to use;

[0031] 4. The set shrinking piece can be suitable for the work of the disconnecting piece, does not affect the normal work of the disconnecting piece, and only increases the clamping force of the clamping plate on the plastic film, and does not affect the clamping of the end of the plastic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 What is shown is a schematic diagram of the overall structure of the embodiment;

[0033] Figure 2 Shown is a first state diagram of an embodiment;

[0034] Figure 3 Shown is a second state diagram of the embodiment;

[0035] Figure 4 Shown is a third state diagram of the embodiment;

[0036] Figure 5 Shown is a rear view of the drive member in the embodiment;

[0037] Figure 6 What is shown is the internal structure diagram of the mounting block in the embodiment;

[0038] Figure 7 What is shown is the working state diagram of the disconnecting and connecting member in the embodiment;

[0039] Figure 8 Shown is an installation diagram of the shrinking member in the embodiment.

[0040] In the figure: 100, film frame; 210, clamping plate; 220, contraction member; 221, storage block; 222, connecting spring; 310, rotating shaft; 320, clamping rod; 330, connecting frame; 340, rack; 350, gear; 360, mounting block; 370, one-way limit member; 371, ratchet; 372, pawl; 380, disconnecting member; 381, plug-in block; 382, ​​moving rod; 383, return spring; 384, push rod; 385, magnetic block; 400, driving member; 410, track frame; 420, moving slider; 430, pushing frame; 500, winding roller. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings of the specification.

[0042] Example

[0043] Figure 1-Figure 4 The coating device for V-method casting comprises:

[0044] A film frame 100, which is located between the film drying device and the template and is used to fix the cut plastic film;

[0045] The film-tearing assembly includes a front-end clamping member and a rear-end clamping member. The front-end clamping member includes two clamping plates 210 that reciprocate in the A direction and the B direction. The rear-end clamping member includes two rotating shafts 310 that rotate in opposite directions. The rotating shafts 310 are equipped with clamping rods 320 through a connecting frame 330. A rack 340 is provided at one end of the clamping plate 210. A gear 350 matching the rack 340 is provided on the surface of the rotating shaft 310.

[0046] The two clamping plates 210 move the clamped plastic film in direction A and exceed the position of the rotating shaft 310. The rack 340 passes through the position of the gear 350 and pushes it to rotate. The rotating shaft 310 at the top part rotates clockwise, and the rotating shaft 310 at the bottom part rotates counterclockwise. The two corresponding clamping rods 320 rotate towards each other to clamp and fix the plastic film, and the clamping plate 210 returns to the original position to clamp the plastic film again.

[0047] The film pulling assembly also includes a driving member 400, which includes two track frames 410 that move toward each other, and the track frames 410 are connected to an external power device. A movable slider 420 is movably inserted in the track frame 410, and the two movable sliders 420 are sleeved on the surface of the same pushing frame 430, and the pushing frame 430 is connected to the external power device. The pushing frame 430 drives the two clamping plates 210 in the A direction through the two movable sliders 420 to pull and extend the plastic film. After the two clamping rods 320 clamp the plastic film, the two track frames 410 drive the corresponding clamping plates 210 to move in the opposite direction to release the plastic film and make it leave the rear end clamping member position, and then the pushing frame 430 resets the two clamping plates 210 in the B direction, and the two track frames 410 move toward each other so that the two clamping plates 210 return to the original position to clamp the plastic film.

[0048] When the plastic film needs to be pulled out, the corresponding external power device pushes the push frame 430 to move in direction A, and the moving slider 420 moves in the track frame 410 and drives the clamping plate 210 to move. The two clamping plates 210 pull and extend part of the plastic film on the roll 500 so that it is at the bottom of the film frame 100. When the rack 340 moves with the clamping plate 210 and passes the position of the gear 350, it pushes the gear 350 to rotate, and the two corresponding clamping rods 320 rotate toward each other to clamp and fix the plastic film. When the moving slider 420 moves to the rear end of the track frame 410, the laminating device is in the first state, and then The corresponding power device moves the two track frames 410 in the opposite direction. After the clamping plate 210 leaves the rear end clamping piece position, the coating device is in the second state. The push frame 430 moves in the B direction to reset the two clamping plates 210. The two track frames 410 then move toward each other to return the two clamping plates 210 to their original positions. The clamping plates 210 clamp the plastic film again, that is, the coating device is in the initial state. The two ends of the plastic film are clamped and fixed by the front end clamping piece and the rear end clamping piece respectively, and then the plastic film can be fixed on the film frame 100. After the fixing is completed, the plastic film at the front end clamping piece position is cut for heating.

[0049] The clamping plate 210 pulls the plastic film to provide power for the rotation of the rotating shaft 310, and the two corresponding clamping rods 320 rotate towards each other to clamp and fix the plastic film. With the assistance of the driving member 400, the two clamping plates 210 return to their original positions to re-clamp the plastic film, preventing the ends of the plastic film from being electrostatically adsorbed due to cutting, and there is no need to find the ends of the plastic film again, thereby ensuring the working efficiency of the laminating device.

[0050] In the prior art, the V-method casting process includes the following steps:

[0051] 1. Prepare the mold and prepare the mold with a vacuum box;

[0052] 2. The EVA plastic film is provided with air holes which are directly connected to the vacuum tube of the vacuum chamber. The plastic film is placed under the film drying device and heated to a softened state;

[0053] 3. Apply vacuum to the softened plastic film through the vent holes of the vacuum box of the mold, so that it fits tightly to the mold;

[0054] 4. Place the negative pressure sand box on the mold;

[0055] 5. The sand box is filled with dry sand through the vibration equipment;

[0056] 6. The top piece of the sand mold in the sand box is covered with a layer of sealing film, the gate basin is connected to the upper mold sprue, and the lower mold needs to be scraped flat with dry sand before covering;

[0057] 7. Evacuate the sand box to create a pressure difference between the inside and outside of the sand mold, compact the dry sand, and release the vacuum of the mold vacuum box at the same time, and introduce compressed air for backblowing to separate the sand mold from the mold;

[0058] 8. Use the same method to produce the lower mold, then combine the upper mold and the lower mold to prepare for pouring;

[0059] 9. Continue to evacuate the sand mold during the pouring process. After the casting cools down, remove the vacuum and take out the casting.

[0060] In the technical solution, the coating method of the coating device for V-method casting is arranged between step 2 and step 3 of the V-method casting process. The coating method of the coating device for V-method casting comprises the following steps:

[0061] S1, pull the plastic film;

[0062] The two clamping plates 210 move the clamped plastic film in the direction A and beyond the position of the rotating shaft 310, and part of the plastic film on the winding roller 500 is then pulled to the bottom of the film frame 100;

[0063] S2, clamping and fixing at the rear end;

[0064] The rack 340 pushes the gear 350 to rotate as the clamping plate 210 passes the position of the gear 350, and the two corresponding clamping rods 320 rotate toward each other to clamp and fix the plastic film;

[0065] S3, front end clamping and fixing;

[0066] The two clamping plates 210 return to their original positions to clamp the plastic film, and then the film frame 100 moves down to fit the surface of the plastic film;

[0067] S4, heating and laminating;

[0068] The plastic film is fixed on the film frame 100 , and after the end of the plastic film is cut, it is heated using a film dryer. After the heating is completed, the film frame 100 is used to attach the plastic film to the template.

[0069] In the technical solution, by keeping the plastic film clamped, the end of the plastic film is prevented from being electrostatically adsorbed due to cutting, and there is no need to find the end of the plastic film again, which will not affect the laminating work of the laminating device.

[0070] Figure 6-Figure 7 In the embodiment, the rear end clamping member also includes two mounting blocks 360, and the mounting blocks 360 and the track frame 410 are respectively located at both ends of the rotating shaft 310, and the mounting blocks 360 are fixedly mounted on the external mounting frame. One end of the rotating shaft 310 is rotatably inserted into the corresponding mounting block 360, and a torsion spring is arranged between the rotating shaft 310 and the mounting block 360.

[0071] The rear end clamping member also includes two one-way limit members 370, which are symmetrically arranged relative to the middle part of the device. The one-way limit members 370 are located in the corresponding mounting block 360. The one-way limit member 370 includes a ratchet 371 and a plurality of pawls 372. The rotating shaft of the ratchet 371 is coaxially fixedly connected with the corresponding rotating shaft 310. One end of the pawl 372 is inserted into the tooth groove of the ratchet 371, and the other end of the pawl 372 is provided with a torsion spring through the rotating part and the mounting block 360.

[0072] When the rack 340 pushes the gear 350 to rotate, the two rotating shafts 310 rotate accordingly in the corresponding mounting blocks 360. At this time, the rotating shaft 310 at the top piece rotates clockwise, and the rotating shaft 310 at the bottom piece rotates counterclockwise. The rotation of the rotating shaft 310 drives the ratchet 371 to rotate, and one end of the pawl 372 slides on the surface of the ratchet 371 and passes through the tooth grooves of multiple ratchet 371 in sequence. When the two clamping rods 320 contact, the path for the two rotating shafts 310 to continue to rotate is blocked. At the same time, the one-way limit member 370 blocks the path for the rotating shaft 310 to reset, so as to prevent the rotating shaft 310 from driving the clamping rod 320 to automatically reset after the rack 340 leaves the gear 350 position, thereby ensuring that the clamping rod 320 clamps and fixes the plastic film.

[0073] The one-way limiter 370 can block the path of the rotating shaft 310 to return to its original position, thereby preventing the clamping rod 320 from moving in the opposite direction under the action of external force when the rack 340 leaves the gear 350, thereby ensuring the clamping and fixing effect of the clamping rod 320 on the plastic film.

[0074] Figure 6-Figure 7 In the figure, the rear end clamping part also includes two disconnecting parts 380, and the disconnecting parts 380 include a plug-in block 381, and the plug-in block 381 is movably plugged between the rotating shaft 310 and the rotating shaft of the pawl 372. A moving rod 382 is arranged at one end of the plug-in block 381, and a return spring 383 is sleeved on the surface of the moving rod 382. One end of the moving rod 382 passes through the mounting block 360 and extends to the outside, and a push rod 384 is arranged at one end of the moving rod 382.

[0075] A magnetic block 385 is disposed at one end of the moving rod 382 , and magnetic pole surfaces with different magnetic properties are disposed at both ends of the plug-in block 381 .

[0076] One end of the push rod 384 is located at the bottom of the track frame 410. After the clamping plate 210 is reset, the two track frames 410 continue to move toward each other to push the track frame 410 to move so that the moving rod 382 drives the plug-in block 381 to leave the rotating shaft 310 and the pawl 372.

[0077] When the film frame 100 needs to move downward, the two track frames 410 continue to move toward each other, and the track frames 410 then contact the corresponding push rods 384 to push them, and the moving rod 382 then drives the magnetic block 385 to move and compress the return spring 383. Under the adsorption action of the magnetic block 385, the plug-in block 381 leaves the rotating shaft 310 and the rotating shaft position of the pawl 372 along with the moving rod 382, ​​and loses the restriction of the plug-in block 381. The compressed torsion spring rotates the rotating shaft 310 to reset, and the two clamping rods 320 are reset and no longer clamp the plastic film.

[0078] The disconnecting piece 380 can disconnect the connection between the rotating shaft 310 and the one-way limit piece 370. The rotating shaft 310 can automatically reset under the action of its torsion spring without the need to manually adjust the rear end clamping piece. After the automatic adjustment of the end clamping piece is completed, the rotating shaft 310 and the one-way limit piece 370 are reconnected, which is more convenient to use.

[0079] Figure 8 In the figure, the front-end clamping member also includes two retracting members 220, and the retracting member 220 includes a storage block 221, one end of the storage block 221 is fixedly connected to the movable slider 420, one end of the clamping plate 210 is movably inserted in the storage block 221, and the clamping plate 210 and the storage block 221 are fixedly connected by multiple connecting springs 222.

[0080] When the disconnecting member 380 is working, the two track frames 410 continue to move toward each other. Due to the mutual blocking between the two clamping plates 210, the clamping plate 210 is squeezed into the storage block 221, and the connecting spring 222 is compressed and deformed accordingly. The clamping plate 210 only increases the clamping force on the plastic film and will not affect the plastic film. When the disconnecting member 380 is reset, the storage block 221 is reset accordingly, so that the connecting spring 222 is reset, and the clamping plate 210 keeps clamping the plastic film to wait for the next work.

[0081] The set shrinking piece 220 can be adapted to the work of the disconnecting piece 380, does not affect the normal work of the disconnecting piece 380, and only increases the clamping force of the clamping plate 210 on the plastic film, and does not affect the clamping of the end of the plastic film.

[0082] Figure 6-Figure 7 In the embodiment, a soft rubber layer is provided on the surface of the clamping rod 320, and the surface of the soft rubber layer of the clamping rod 320 is rough.

[0083] The rubber soft layer on the surface of the taking rod can be deformed due to extrusion, which can increase the static friction between the rod and the plastic film, thereby ensuring the clamping and fixing strength of the plastic film.

[0084] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A coating device for V-method casting, characterized in that: include: A film frame (100), the film frame (100) being located between the film drying device and the template, and the film frame (100) being used to fix the cut plastic film; A film-tearing assembly, the film-tearing assembly comprising a front-end clamping member and a rear-end clamping member, the front-end clamping member comprising two clamping plates (210) that reciprocate in the A direction and the B direction, the rear-end clamping member comprising two rotating shafts (310) that rotate in opposite directions, the rotating shafts (310) being mounted with clamping rods (320) via a connecting frame (330), a rack (340) being disposed at one end of the clamping plate (210), and a gear (350) matching the rack (340) being disposed on the surface of the rotating shaft (310); The two clamping plates (210) move the clamped plastic film in direction A and exceed the position of the rotating shaft (310), and the rack (340) passes through the position of the gear (350) to push it to rotate, the rotating shaft (310) at the top part rotates clockwise, and the rotating shaft (310) at the bottom part rotates counterclockwise, and the two corresponding clamping rods (320) rotate towards each other to clamp and fix the plastic film, and the clamping plates (210) return to the original position to clamp the plastic film again.

2. The coating device for V-method casting according to claim 1, characterized in that: The film tearing assembly also includes a driving member (400), and the driving member (400) includes two track frames (410) that move toward each other. A movable slider (420) is movably inserted in the track frame (410), and the two movable sliders (420) are sleeved on the surface of the same pushing frame (430). The pushing frame (430) drives the two clamping plates (210) in the A direction through the two movable sliders (420) to pull and extend the plastic film. After the two clamping rods (320) clamp the plastic film, the two track frames (410) drive the corresponding clamping plates (210) to move in the opposite direction to release the plastic film so that it leaves the rear end clamping member position, and then the pushing frame (430) resets the two clamping plates (210) in the B direction, and the two track frames (410) move toward each other so that the two clamping plates (210) return to the original position to clamp the plastic film.

3. The coating device for V-method casting according to claim 2, characterized in that: The rear end clamping member further comprises two mounting blocks (360), wherein the mounting blocks (360) and the track frame (410) are respectively located at two ends of the rotating shaft (310), the mounting blocks (360) are fixedly mounted on the external mounting frame, one end of the rotating shaft (310) is rotatably inserted into the corresponding mounting block (360), and a torsion spring is arranged between the rotating shaft (310) and the mounting block (360).

4. The coating device for V-method casting according to claim 3, characterized in that: The rear end clamping member also includes two one-way limiting members (370), the one-way limiting members (370) are located in the corresponding mounting block (360), the one-way limiting member (370) includes a ratchet (371) and a plurality of ratchet pawls (372), the rotating shaft of the ratchet (371) is coaxially fixedly connected with the corresponding rotating shaft (310), one end of the ratchet pawl (372) is inserted into the tooth groove of the ratchet (371), and the other end of the ratchet pawl (372) is provided with a torsion spring between the rotating part and the mounting block (360).

5. The coating device for V-method casting according to claim 4, characterized in that: The rear end clamping member also includes two disconnecting members (380), and the disconnecting member (380) includes a plug-in block (381), and the plug-in block (381) is movably plugged between the rotating shaft (310) and the rotating shaft of the pawl (372), and a moving rod (382) is arranged at one end of the plug-in block (381), and a return spring (383) is sleeved on the surface of the moving rod (382), and one end of the moving rod (382) passes through the mounting block (360) and extends to the outside, and a push rod (384) is arranged at one end of the moving rod (382).

6. The coating device for V-method casting according to claim 5, characterized in that: A magnetic block (385) is arranged at one end of the moving rod (382), and magnetic pole surfaces with different magnetic properties are arranged at both ends of the plug-in block (381).

7. The coating device for V-method casting according to claim 5, characterized in that: One end of the push rod (384) is located at the bottom of the track frame (410). After the clamping plate (210) is reset, the two track frames (410) continue to move toward each other to push the track frame (410) to move so that the moving rod (382) drives the plug-in block (381) to leave the rotating shaft position of the rotating shaft (310) and the ratchet (372).

8. The coating device for V-method casting according to claim 2, characterized in that: The front-end clamping member also includes two retracting members (220), and the retracting member (220) includes a storage block (221), one end of the storage block (221) is fixedly connected to the movable slider (420), one end of the clamping plate (210) is movably inserted into the storage block (221), and the clamping plate (210) and the storage block (221) are fixedly connected via a plurality of connecting springs (222).

9. The coating device for V-method casting according to claim 1, characterized in that: The surface of the clamping rod (320) is provided with a soft rubber layer, and the surface of the soft rubber layer of the clamping rod (320) is rough.

10. The coating method of the coating device for V-method casting according to any one of claims 1 to 9, characterized in that: The following steps are included: S1, pull the plastic film; The two clamping plates (210) move the clamped plastic film in the direction A and beyond the position of the rotating shaft (310), and part of the plastic film on the winding roller (500) is then pulled to the bottom of the film frame (100); S2, clamping and fixing at the rear end; The rack (340) drives the gear (350) to rotate as the clamping plate (210) passes the position of the gear (350), and the two corresponding clamping rods (320) rotate towards each other to clamp and fix the plastic film; S3, front end clamping and fixing; The two clamping plates (210) are reset to their original positions to clamp the plastic film, and then the film frame (100) moves downward to fit the surface of the plastic film; S4, heating and laminating; The plastic film is fixed on the film frame (100), and after the end of the plastic film is cut, it is heated using a film dryer. After the heating is completed, the film frame (100) is used to attach the plastic film to the template.

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