Ultra-breadth three-layer co-extrusion diaphragm casting machine and method thereof

Abstract

The invention relates to the technical field of casting devices, in particular to an ultra-breadth three-layer co-extrusion diaphragm casting machine and a method thereof.The ultra-breadth three-layer co-extrusion diaphragm casting machine comprises an extrusion assembly and a casting mechanism arranged below the extrusion assembly, and the extrusion assembly comprises a die head body, a material passing block, a discharging opening and two adjusting assemblies; the interior of the die head body is divided into three material bins through two material distributing plates, a plurality of material discharging channels are formed in the top of each material bin, three material feeding channels are formed in the top of the die head body, three material passing channels are formed in the material passing block, and the material passing channels are communicated with the material discharging channels. A material receiving pipe is arranged on the side, penetrating out of the material passing block, of one end of each material passing channel, the discharging port comprises two material extruding blocks which are connected in a sliding mode, and a driving switching assembly is arranged between the two adjusting assemblies. The proportion of the positions where all the bins converge and extrude at the discharging opening and the thickness of the formed diaphragm are adjusted, the flexibility of diaphragm preparation is achieved, and the diaphragm machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of casting devices, and in particular to an ultra-wide three-layer co-extruded diaphragm casting machine and a method thereof. Background Art

[0002] At present, the lithium battery separators commercialized on the market are mainly microporous polyolefin separators based on polyethylene (PE) and polypropylene (PP). Such separators are widely used in lithium battery separators due to their low cost, good mechanical properties, excellent chemical stability and electrochemical stability. In practical applications, they include single-layer PP or PE separators, double-layer PE / PP composite separators, double-layer PP / PP composite separators, and three-layer PP / PE / PP composite separators. Among them, the three-layer PP / PE / PP composite separator is widely used in battery separators due to its excellent mechanical properties and corrosion resistance.

[0003] During the use of the existing three-layer co-extrusion casting device, the extruder head is an integrated mold part, which means that one type of extruder head can only produce one type of diaphragm. The combination of the proportions of each layer and the thickness of the diaphragm can only be achieved by replacing different extruder heads. This not only increases labor costs, but also seriously reduces the efficiency of diaphragm production due to downtime for replacement. Summary of the invention

[0004] In view of this, the object of the present invention is to provide an ultra-wide three-layer co-extrusion diaphragm casting machine and method thereof to solve the problems raised in the above background technology.

[0005] Based on the above purpose, the present invention provides an ultra-wide three-layer co-extrusion diaphragm casting machine, comprising an extrusion component and a casting mechanism arranged below the extrusion component, wherein the extrusion component comprises:

[0006] The die body has two material dividing plates slidably connected inside, and the interior of the die body is divided into three silos by the two material dividing plates. The top of each silo is provided with a plurality of discharge channels, and the top of the die body is provided with three feed channels, and each feed channel is respectively connected with all the discharge channels in the corresponding silo;

[0007] A material passing block is fixedly arranged on the top of the die body, and three mutually unconnected material passing channels are arranged inside the material passing block, one end of each material passing channel is respectively connected with the feed channel, and the other end passes through one side of the material passing block and is provided with a material receiving pipe for connecting with the extruder;

[0008] A discharge port is arranged at the bottom of the die body, and the discharge port comprises two extrusion blocks connected in a sliding manner;

[0009] Two adjustment components are both arranged on one side of the die body, the working end of one of the adjustment components passes through one side of the die body and is transmission-connected to one of the material dividing plates, and the working end of the other adjustment component is transmission-connected to the extrusion block, and a drive switching component is arranged between the two adjustment components, and the drive switching component is transmission-connected to the two adjustment components;

[0010] When the driving switching component controls one regulating component to work, the other regulating component does not work.

[0011] Preferably, a plurality of heating rods are provided inside the die body, and both ends of each heating rod pass through one of the dividing plates respectively.

[0012] Preferably, the adjustment component comprises:

[0013] A gear is arranged on one side of the die body through a shaft, the shaft is fixedly connected to the gear, the shaft is rotationally connected to the die body, and the shaft is transmission-connected to the drive switching assembly;

[0014] Two first guide rods are respectively arranged on one side of the die head body, and one end of each of the first guide rods is respectively fixedly connected to the material dividing plate;

[0015] Two connecting plates, one end of which is fixedly connected to one end of the first guide rod away from the material dividing plate, and the other end of which is fixedly provided with a rack, each of which is slidably connected to one side of the die body, and each of which is meshed with the gear.

[0016] Preferably, the drive switching component comprises:

[0017] A support frame is fixedly mounted on one side of the die body, and two connecting sleeves are penetrated on the side of the support frame away from the die body, and each connecting sleeve is respectively sleeved on the shaft rod;

[0018] A belt-type synchronous wheel set is arranged on a side of the support frame away from the die head body, the two pulleys of the belt-type synchronous wheel set are respectively sleeved on the connecting sleeve and connected by a key structure, one side of the two pulleys of the belt-type synchronous wheel set are rotatably connected with a fixed cylinder, each of the fixed cylinders is respectively sleeved on the connecting sleeve, and each of the fixed cylinders is fixedly connected to the support frame;

[0019] A mounting frame, fixedly mounted on the support frame, a motor is fixedly mounted on the mounting frame, an output shaft of the motor passes through the mounting frame and is inserted into one of the connecting sleeves, and the output shaft of the motor is connected to the connecting sleeve via a key structure;

[0020] Two L-shaped rods, one end of which is fixed on the connecting sleeve and the shaft rod respectively, and the other end is symmetrically arranged close to each other;

[0021] Two rotating rings are respectively sleeved on the connecting sleeve and clamped, each of the rotating rings is rotatably connected to the connecting sleeve, and each of the rotating rings is respectively fixed with two convex shafts;

[0022] Two brackets are fixed on the die body, a switching plate is provided between the two brackets, the middle part of the switching plate is rotatably connected with the two brackets, two connecting arms are provided at both ends of the switching plate, each connecting arm is provided with a waist-shaped through hole, and each waist-shaped through hole is respectively sleeved on the convex shaft;

[0023] Two iron blocks are respectively fixed on the top of one end of the switching plate;

[0024] Two electromagnets are respectively arranged above the iron block, and each of the electromagnets is fixedly connected to the support frame.

[0025] Preferably, a locking plate is provided between the L-shaped rod on the shaft and the gear, the locking plate is sleeved on the shaft, a side of the locking plate close to the L-shaped rod is provided with a plurality of tooth grooves distributed in a ring array, a side of the L-shaped rod on the shaft close to the locking plate is provided with convex teeth adapted to the tooth grooves, both ends of the locking plate are slidably connected with support plates, each of the support plates is fixedly connected to the die head body, two second guide rods are fixedly provided on the locking plate, the other ends of the two second guide rods are fixedly provided with a driving plate, the driving plate is sleeved on the connecting sleeve and clamped, and the driving plate is rotatably connected to the connecting sleeve.

[0026] Preferably, the casting mechanism includes a casting roller and a pressure roller cooperating with the surface of the casting roller, and there are at least two pressure rollers, which are arranged on the upper right side of the casting roller, and a gap is provided between the two pressure rollers and the casting roller, which is used to press the die body to cast the three-layer co-extruded film on the casting roller, wherein the distance between the pressure roller located below and the casting roller is smaller than the distance between the pressure roller located above and the casting roller.

[0027] Preferably, the casting roller includes a roller body and a roller shell, the roller body and the pressure roller are hollow structures, the surface of the roller body is provided with a plurality of through holes, the roller shell is coated on the surface of the roller body, the roller shell is a plastic with a microporous structure, one end of the roller body is used to connect the cooling liquid introduced into the roller body, and the other end is connected to one end of the pressure roller and is provided with a liquid pipe, and the other end of the pressure roller is used to connect to the cooling liquid storage device.

[0028] A method for using an ultra-wide three-layer co-extrusion diaphragm casting machine comprises the following steps:

[0029] S1: The raw materials are introduced into the material transfer channel through the receiving pipe through three extruders, introduced into the feed channel through the material transfer channel, introduced into each discharge channel through the feed channel, introduced into the corresponding silo through the discharge channel, and converged to the discharge port through the silo for extrusion molding and discharged to the casting mechanism;

[0030] S2: When the proportions of the three layers of the diaphragm are different, the power drive is connected to an adjustment component by driving the switching component to control the material distribution plates in the die head component to move closer to or away from each other, so as to adjust the proportions of the positions where each silo converges and extrude at the discharge port, and at the same time, to control the number of extruders working, so as to flexibly prepare the diaphragm;

[0031] S3: When the thickness of the diaphragm needs to be adjusted, the power drive is connected to another adjustment component through the drive switching component. The adjustment component controls the extrusion blocks to move closer to or away from each other. On the one hand, it is used to adjust the proportion of the position where each silo converges and extrude at the discharge port. On the other hand, it is used to adjust the thickness of the diaphragm after molding, further improving the flexibility of diaphragm preparation.

[0032] The beneficial effects of the present invention are as follows: by arranging a movable material dividing block inside the die body, arranging a movable extrusion block at the discharge port, and arranging two adjustment components respectively used to control the driving of the material dividing block and the extrusion block, and controlling the working states of the two adjustment components by driving the switching component, the proportion of the position where each silo converges and extrudes at the discharge port and the thickness of the diaphragm after molding can be adjusted, thereby achieving the flexibility of diaphragm preparation and improving the efficiency of diaphragm processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0035] Figure 2 It is a cross-sectional schematic diagram of a casting mechanism according to an embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of the three-dimensional structure of the adjustment component according to an embodiment of the present invention;

[0037] Figure 4 It is a schematic diagram of the three-dimensional structure of a drive switching component according to an embodiment of the present invention;

[0038] Figure 5It is a schematic diagram of the three-dimensional structure of the shaft rod according to an embodiment of the present invention.

[0039] The markings in the figure are:

[0040] 1. Die head body; 2. Dividing plate; 3. Material bin; 4. Discharge channel; , Feed channel; 6. Feed block; 7. Feed channel; 8. Receiving pipe; 9. Discharge port; 10. Extrusion block; 11. Heating rod; 12. Gear; 13. Shaft; 14. First guide rod; 1. Connecting plate; 16. Rack; 17. Support frame; 18. Connecting sleeve; 19. Belt synchronous wheel set; 20. Fixing cylinder; 21. Mounting frame ; 22. Motor; 23. L-shaped rod; 24. Swivel; 2. Cam shaft; 26. Bracket; 27. Switching plate; 28. Connecting arm; 29. ​​Iron block; 30. Electromagnet; 31. Locking plate; 32. Tooth groove; 33. Cam tooth; 34. Support plate; 3. Second guide rod; 36. Driving plate; 37. Casting roller; 38. Pressure roller; 39. Three-layer co-extruded film; 40. Roller body; 41. Roller shell; 42. Liquid passing pipe. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0042] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] like Figures 1 to 5 As shown, an ultra-wide three-layer co-extrusion diaphragm casting machine includes an extrusion component and a casting mechanism arranged below the extrusion component, wherein the extrusion component includes:

[0044] The die body has two material dividing plates slidably connected inside, and the interior of the die body is divided into three silos by the two material dividing plates. The top of each silo is provided with a plurality of discharge channels, and the top of the die body is provided with three feed channels, and each feed channel is respectively connected with all the discharge channels in the corresponding silo;

[0045] A material passing block is fixedly arranged on the top of the die body, and three mutually unconnected material passing channels are arranged inside the material passing block, one end of each material passing channel is respectively connected with the feed channel, and the other end passes through one side of the material passing block and is provided with a material receiving pipe for connecting with the extruder;

[0046] A discharge port is arranged at the bottom of the die body, and the discharge port comprises two extrusion blocks connected in a sliding manner;

[0047] Two adjustment components are both arranged on one side of the die body, the working end of one of the adjustment components passes through one side of the die body and is transmission-connected to one of the material dividing plates, and the working end of the other adjustment component is transmission-connected to the extrusion block, and a drive switching component is arranged between the two adjustment components, and the drive switching component is transmission-connected to the two adjustment components;

[0048] When the driving switching component controls one regulating component to work, the other regulating component does not work.

[0049] For example, the raw materials are introduced into the feed channel through the receiving pipe through the three extruders, then introduced into the feed channel through the feed channel, introduced into each discharge channel through the feed channel, introduced into the corresponding silo through the discharge channel, and then converged to the discharge port through the silo for extrusion molding and discharged to the casting mechanism; when the proportions of the three layers of the diaphragm are different, the driving switching component is operated to connect the power drive to an adjustment component, and the adjustment component controls the dividing plates in the die head assembly to move closer to or away from each other, so as to adjust the proportion of the positions where the silos converge and extrude at the discharge port, and at the same time, to control the number of extruders working, so as to flexibly prepare the diaphragm; when the thickness of the diaphragm needs to be adjusted, the driving switching component is operated to connect the power drive to another adjustment component, and the adjustment component controls the extrusion blocks to move closer to or away from each other. On the one hand, it is used to adjust the proportion of the positions where the silos converge and extrude at the discharge port, and on the other hand, it is used to adjust the thickness of the diaphragm after molding, thereby further improving the flexibility of diaphragm preparation.

[0050] As an optional embodiment, a plurality of heating rods are provided inside the die body, and both ends of each heating rod pass through one of the dividing plates respectively.

[0051] For example, by providing a heating rod, on the one hand, the solidification of the molten material in the die body can be avoided, and on the other hand, the temperature of each layer after extrusion can be further increased, so that each layer expands in the discharge port, thereby improving the composite strength between the extruded layers.

[0052] As an optional embodiment, the adjustment component includes:

[0053] A gear is arranged on one side of the die body through a shaft, the shaft is fixedly connected to the gear, the shaft is rotationally connected to the die body, and the shaft is transmission-connected to the drive switching assembly;

[0054] Two first guide rods are respectively arranged on one side of the die head body, and one end of each of the first guide rods is respectively fixedly connected to the material dividing plate;

[0055] Two connecting plates, one end of which is fixedly connected to one end of the first guide rod away from the material dividing plate, and the other end of which is fixedly provided with a rack, each of which is slidably connected to one side of the die body, and each of which is meshed with the gear.

[0056] For example, by driving the switching assembly to drive the shaft to rotate, the shaft drives the gear to rotate, the gear drives the rack to move, the rack drives the connecting plate to move, the connecting plate drives the first guide rod to move, and the first guide rod drives the dividing plate to move, so that the proportions between the various silos are adjusted.

[0057] As an optional embodiment, the drive switching component includes:

[0058] A support frame is fixedly mounted on one side of the die body, and two connecting sleeves are penetrated on the side of the support frame away from the die body, and each connecting sleeve is respectively sleeved on the shaft rod;

[0059] A belt-type synchronous wheel set is arranged on a side of the support frame away from the die head body, the two pulleys of the belt-type synchronous wheel set are respectively sleeved on the connecting sleeve and connected by a key structure, one side of the two pulleys of the belt-type synchronous wheel set are rotatably connected with a fixed cylinder, each of the fixed cylinders is respectively sleeved on the connecting sleeve, and each of the fixed cylinders is fixedly connected to the support frame;

[0060] A mounting frame, fixedly mounted on the support frame, a motor is fixedly mounted on the mounting frame, an output shaft of the motor passes through the mounting frame and is inserted into one of the connecting sleeves, and the output shaft of the motor is connected to the connecting sleeve via a key structure;

[0061] Two L-shaped rods, one end of which is fixed on the connecting sleeve and the shaft rod respectively, and the other end is symmetrically arranged close to each other;

[0062] Two rotating rings are respectively sleeved on the connecting sleeve and clamped, each of the rotating rings is rotatably connected to the connecting sleeve, and each of the rotating rings is respectively fixed with two convex shafts;

[0063] Two brackets are fixed on the die body, a switching plate is provided between the two brackets, the middle part of the switching plate is rotatably connected with the two brackets, two connecting arms are provided at both ends of the switching plate, each connecting arm is provided with a waist-shaped through hole, and each waist-shaped through hole is respectively sleeved on the convex shaft;

[0064] Two iron blocks are respectively fixed on the top of one end of the switching plate;

[0065] Two electromagnets are respectively arranged above the iron block, and each of the electromagnets is fixedly connected to the support frame.

[0066] For example, the corresponding electromagnet is energized to adsorb the corresponding iron block, so that one end of the switching plate is tilted up and the other end is moved down. The waist-shaped through hole corresponding to the downward end of the switching plate drives the connecting arm to move through the cooperation with the convex shaft, and the connecting arm drives the corresponding swivel to move, and the swivel drives the connecting sleeve to move, and the connecting sleeve drives the L-shaped rod to move and resist and cross the L-shaped rod on the shaft rod. The two L-shaped rods corresponding to the tilted end of the switching plate are away from each other and do not interfere with each other. At this time, the connecting sleeve is driven to rotate by the motor, and the connecting sleeve drives the belt-type synchronous wheel set to work. Although the belt-type synchronous wheel set drives the two connecting sleeves to rotate synchronously, the cooperation of the L-shaped rod makes one gear rotate and the other gear does not rotate, thereby controlling the movement of the dividing plate or the extrusion block.

[0067] As an optional embodiment, a locking plate is provided between the L-shaped rod on the shaft and the gear, and the locking plate is sleeved on the shaft, and a side of the locking plate close to the L-shaped rod is provided with a plurality of tooth grooves distributed in a ring array, and a side of the L-shaped rod on the shaft close to the locking plate is provided with convex teeth adapted to the tooth grooves, and support plates are slidably connected to both ends of the locking plate, and each of the support plates is fixedly connected to the die head body, and two second guide rods are fixedly provided on the locking plate, and a driving plate is fixedly provided on the other ends of the two second guide rods, and the driving plate is sleeved on the connecting sleeve and clamped, and the driving plate is rotatably connected to the connecting sleeve.

[0068] For example, when the two L-shaped rods corresponding to one end of the switching plate are tilted away from each other and do not interfere with each other, the connecting sleeve drives the driving plate to move, and the driving plate drives the locking plate to move close to the side of the L-shaped rod on the shaft rod through the second guide rod. The L-shaped rod is locked on the locking plate through the coordination of the tooth grooves and the convex teeth, so that the shaft rod is clamped and does not rotate, thereby further locking the dividing plate or extrusion block to avoid different pressures inside each silo, which makes the data of each layer proportion in the diaphragm production unstable.

[0069] As an optional embodiment, the casting mechanism includes a casting roller and a pressure roller cooperating with the surface of the casting roller, and there are at least two pressure rollers, which are arranged on the upper right side of the casting roller, and a gap is provided between the two pressure rollers and the casting roller, which is used to press the three-layer co-extruded film cast from the die body onto the casting roller, wherein the distance between the pressure roller located below and the casting roller is smaller than the distance between the pressure roller located above and the casting roller.

[0070] As an optional embodiment, the casting roller includes a roller body and a roller shell, the roller body and the pressure roller are hollow structures, the surface of the roller body is provided with a plurality of through holes, the roller shell is coated on the surface of the roller body, the roller shell is a plastic with a microporous structure, one end of the roller body is used to connect the cooling liquid introduced into the roller body, and the other end is connected to one end of the pressure roller and is provided with a liquid pipe, and the other end of the pressure roller is used to connect to the cooling liquid storage device.

[0071] For example, the cooling liquid introduced into the roller body can enter the roller shell from the through hole and flow from the microporous structure of the roller shell to the surface of the casting roller. On the one hand, the temperature of the casting roller is maintained, so that the casting roller can cool the three-layer co-extruded film. On the other hand, the cooling liquid flowing out of the microporous structure can effectively prevent the three-layer co-extruded film from adhering to the surface of the casting roller, which is beneficial to the peeling of the three-layer co-extruded film after cooling and ensures the cleanliness of the casting roller, so that the device can be continuously produced. At the same time, by setting a liquid pipe connection, the cooling liquid can be circulated and the utilization rate of the cooling liquid is improved.

[0072] A method for using an ultra-wide three-layer co-extrusion diaphragm casting machine comprises the following steps:

[0073] S1: The raw materials are introduced into the material transfer channel through the receiving pipe through three extruders, introduced into the feed channel through the material transfer channel, introduced into each discharge channel through the feed channel, introduced into the corresponding silo through the discharge channel, and converged to the discharge port through the silo for extrusion molding and discharged to the casting mechanism;

[0074] S2: When the proportions of the three layers of the diaphragm are different, the power drive is connected to an adjustment component by driving the switching component to control the material distribution plates in the die head component to move closer to or away from each other, so as to adjust the proportions of the positions where each silo converges and extrude at the discharge port, and at the same time, to control the number of extruders working, so as to flexibly prepare the diaphragm;

[0075] S3: When the thickness of the diaphragm needs to be adjusted, the power drive is connected to another adjustment component through the drive switching component. The adjustment component controls the extrusion blocks to move closer to or away from each other. On the one hand, it is used to adjust the proportion of the position where each silo converges and extrude at the discharge port. On the other hand, it is used to adjust the thickness of the diaphragm after molding, further improving the flexibility of diaphragm preparation.

[0076] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ultra-wide three-layer co-extrusion diaphragm casting machine, comprising an extrusion assembly and a casting mechanism arranged below the extrusion assembly, characterized in that: The extrusion assembly comprises: The die body has two material dividing plates slidably connected inside, and the interior of the die body is divided into three silos by the two material dividing plates. The top of each silo is provided with a plurality of discharge channels, and the top of the die body is provided with three feed channels, and each feed channel is respectively connected with all the discharge channels in the corresponding silo; A material passing block is fixedly arranged on the top of the die body, and three mutually unconnected material passing channels are arranged inside the material passing block, one end of each material passing channel is respectively connected with the feed channel, and the other end passes through one side of the material passing block and is provided with a material receiving pipe for connecting with the extruder; A discharge port is arranged at the bottom of the die body, and the discharge port comprises two extrusion blocks connected in a sliding manner; Two adjustment components are both arranged on one side of the die body, the working end of one of the adjustment components passes through one side of the die body and is transmission-connected to one of the material dividing plates, and the working end of the other adjustment component is transmission-connected to the extrusion block, and a drive switching component is arranged between the two adjustment components, and the drive switching component is transmission-connected to the two adjustment components; When the driving switching component controls one regulating component to work, the other regulating component does not work.

2. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 1 is characterized in that: A plurality of heating rods are arranged inside the die body, and two ends of each heating rod pass through one of the dividing plates respectively.

3. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 1 is characterized in that: The adjustment component comprises: A gear is arranged on one side of the die body through a shaft, the shaft is fixedly connected to the gear, the shaft is rotationally connected to the die body, and the shaft is transmission-connected to the drive switching assembly; Two first guide rods are respectively arranged on one side of the die head body, and one end of each of the first guide rods is fixedly connected to the material dividing plate; Two connecting plates, one end of which is fixedly connected to one end of the first guide rod away from the material dividing plate, and the other end of which is fixedly provided with a rack, each of which is slidably connected to one side of the die body, and each of which is meshed with the gear.

4. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 3 is characterized in that: The drive switching component comprises: A support frame is fixedly mounted on one side of the die body, and two connecting sleeves are penetrated on the side of the support frame away from the die body, and each connecting sleeve is respectively sleeved on the shaft rod; A belt-type synchronous wheel set is arranged on a side of the support frame away from the die head body, the two pulleys of the belt-type synchronous wheel set are respectively sleeved on the connecting sleeve and connected by a key structure, one side of the two pulleys of the belt-type synchronous wheel set are rotatably connected with a fixed cylinder, each of the fixed cylinders is respectively sleeved on the connecting sleeve, and each of the fixed cylinders is fixedly connected to the support frame; A mounting frame, fixedly mounted on the support frame, a motor is fixedly mounted on the mounting frame, an output shaft of the motor passes through the mounting frame and is inserted into one of the connecting sleeves, and the output shaft of the motor is connected to the connecting sleeve via a key structure; Two L-shaped rods, one end of which is fixed on the connecting sleeve and the shaft rod respectively, and the other end is symmetrically arranged close to each other; Two rotating rings are respectively sleeved on the connecting sleeve and clamped, each of the rotating rings is rotatably connected to the connecting sleeve, and each of the rotating rings is respectively fixed with two convex shafts; Two brackets are fixed on the die body, a switching plate is provided between the two brackets, the middle part of the switching plate is rotatably connected with the two brackets, two connecting arms are provided at both ends of the switching plate, each connecting arm is provided with a waist-shaped through hole, and each waist-shaped through hole is respectively sleeved on the convex shaft; Two iron blocks are respectively fixed on the top of one end of the switching plate; Two electromagnets are respectively arranged above the iron block, and each of the electromagnets is fixedly connected to the support frame.

5. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 4, characterized in that: A locking plate is provided between the L-shaped rod on the shaft and the gear, and the locking plate is sleeved on the shaft, and a plurality of tooth grooves distributed in a ring array are provided on the side of the locking plate close to the L-shaped rod, and a convex tooth matched with the tooth grooves is provided on the side of the L-shaped rod on the shaft close to the locking plate, and support plates are slidably connected to both ends of the locking plate, and each of the support plates is fixedly connected to the die head body, and two second guide rods are fixedly provided on the locking plate, and a driving plate is fixedly provided on the other ends of the two second guide rods, and the driving plate is sleeved on the connecting sleeve and clamped, and the driving plate is rotatably connected to the connecting sleeve.

6. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 1, characterized in that: The casting mechanism includes a casting roller and a pressure roller matched with the surface of the casting roller. There are at least two pressure rollers, which are arranged on the upper right side of the casting roller, and a gap is provided between the two pressure rollers and the casting roller, which is used to press the die head body to cast the three-layer co-extruded film on the casting roller, wherein the distance between the pressure roller located below and the casting roller is smaller than the distance between the pressure roller located above and the casting roller.

7. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 6, characterized in that: The casting roller includes a roller body and a roller shell. The roller body and the pressure roller are hollow structures. The surface of the roller body is provided with a plurality of through holes. The roller shell is coated on the surface of the roller body. The roller shell is a plastic with a microporous structure. One end of the roller body is used to connect the cooling liquid introduced into the roller body, and the other end is connected to one end of the pressure roller and is provided with a liquid pipe. The other end of the pressure roller is used to connect to the cooling liquid storage device.

8. The method for using the ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 1, characterized in that: The steps include: S1: The raw materials are introduced into the material transfer channel through the receiving pipe through three extruders, introduced into the feed channel through the material transfer channel, introduced into each discharge channel through the feed channel, introduced into the corresponding silo through the discharge channel, and converged to the discharge port through the silo for extrusion molding and discharged to the casting mechanism; S2: When the proportions of the three layers of the diaphragm are different, the power drive is connected to an adjustment component by driving the switching component to control the material distribution plates in the die head component to move closer to or away from each other, so as to adjust the proportions of the positions where each silo converges and extrude at the discharge port, and at the same time, to control the number of extruders working, so as to flexibly prepare the diaphragm; S3: When the thickness of the diaphragm needs to be adjusted, the power drive is connected to another adjustment component through the drive switching component. The adjustment component controls the extrusion blocks to move closer to or away from each other. On the one hand, it is used to adjust the proportion of the position where each silo converges and extrude at the discharge port. On the other hand, it is used to adjust the thickness of the diaphragm after molding, further improving the flexibility of diaphragm preparation.

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