A three-layer co-extrusion diaphragm casting machine and method for ultra-wide width

Abstract

This invention relates to the field of casting equipment technology, specifically to an ultra-wide three-layer co-extrusion diaphragm casting machine and method, comprising an extrusion assembly and a casting mechanism disposed below the extrusion assembly. The extrusion assembly includes a die head body, a feeding block, a discharge port, and two adjustment components. The interior of the die head body is divided into three material bins by two dividing plates. Each material bin has multiple discharge channels at its top. The top of the die head body has three feeding channels. The feeding block has three feeding channels inside. One end of each feeding channel extends out of one side of the feeding block and is provided with a receiving pipe. The discharge port consists of two slidably connected extrusion blocks. A drive switching component is provided between the two adjustment components. This invention enables adjustment of the proportion of each material bin at the discharge port where they converge and are extruded, and adjustment of the thickness of the diaphragm after forming, thereby achieving flexibility in diaphragm preparation and improving the efficiency of diaphragm processing.

Description

Technical Field

[0001] This invention relates to the field of casting equipment technology, and in particular to an ultra-wide three-layer co-extrusion diaphragm casting machine and its method. Background Technology

[0002] Currently, commercially available lithium-ion battery separators are mainly microporous polyolefin separators based on polyethylene (PE) and polypropylene (PP). These separators are widely used in lithium-ion battery separators due to their advantages such as low cost, good mechanical properties, and excellent chemical and electrochemical stability. Practical applications 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 these, the three-layer PP / PE / PP composite separator is widely used in battery separators due to its excellent mechanical properties and corrosion resistance.

[0003] In the existing three-layer co-extrusion casting equipment, 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 each layer ratio and the thickness of the diaphragm can only be achieved by changing 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 purpose of this invention is to provide an ultra-wide three-layer co-extrusion diaphragm casting machine and method thereof to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides an ultra-wide three-layer co-extrusion diaphragm casting machine, comprising an extrusion assembly and a casting mechanism disposed below the extrusion assembly, wherein the extrusion assembly includes:

[0006] The die head body has two material distribution plates slidably connected inside. The interior of the die head body is divided into three material bins by the two material distribution plates. Each material bin has multiple discharge channels at its top. The top of the die head body has three infeed channels. Each infeed channel is connected to all the discharge channels in the corresponding material bin.

[0007] The feed block is fixed on the top of the die head body. The feed block has three non-interconnected feed channels inside. One end of each feed channel is connected to the feed channel, and the other end extends out of the feed block and is provided with a receiving pipe for connecting to the extruder.

[0008] The discharge port is located at the bottom of the die head body, and the discharge port consists of two slidably connected extrusion blocks;

[0009] Two adjustment components are both disposed on one side of the die head body. The working end of one adjustment component passes through one side of the die head body and is connected to one of the material distribution plates. The working end of the other adjustment component is connected to the extrusion block. A drive switching component is provided between the two adjustment components and is connected to the two adjustment components.

[0010] In this configuration, when one adjustment component is controlled to work by the drive switching component, the other adjustment component does not work.

[0011] Preferably, the interior of the die head body is provided with multiple heating rods, and the two ends of each heating rod pass through a material distribution plate.

[0012] Preferably, the adjustment component includes:

[0013] A gear is mounted on one side of the die head body via a shaft. The shaft is fixedly connected to the gear, rotatably connected to the die head body, and drivingly connected to the drive switching assembly.

[0014] Two first guide rods are respectively inserted through one side of the die head body, and one end of each first guide rod is fixedly connected to the material distribution plate;

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

[0016] Preferably, the drive switching component includes:

[0017] A support frame is fixed to one side of the die head body. Two connecting sleeves are provided on the side of the support frame away from the die head body, and each connecting sleeve is respectively sleeved on the shaft.

[0018] A belt-type synchronous pulley set is disposed on the side of the support frame away from the die head body. The two pulleys of the belt-type synchronous pulley set are respectively sleeved on the connecting sleeve and connected by a snap-key structure. A fixed cylinder is rotatably connected to one side of each of the two pulleys of the belt-type synchronous pulley set. Each fixed cylinder is respectively sleeved on the connecting sleeve and each fixed cylinder is fixedly connected to the support frame.

[0019] A mounting bracket is fixed on the support frame, and a motor is fixed on the mounting bracket. The output shaft of the motor passes through the mounting bracket and is inserted into a connecting sleeve. The output shaft of the motor is connected to the connecting sleeve by a snap-key structure.

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

[0021] Two rotating rings are respectively fitted onto the connecting sleeve and snapped together. Each rotating ring is rotatably connected to the connecting sleeve, and each rotating ring is fixed with two protruding shafts.

[0022] Two brackets are fixed on the mold head body. A switching plate is provided between the two brackets. The middle part of the switching plate is rotatably connected to the two brackets. Two connecting arms are provided at both ends of the switching plate. Each connecting arm is provided with an oblong through hole. Each oblong through hole is respectively sleeved on the convex shaft.

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

[0024] Two electromagnets are respectively positioned above the iron block, and each electromagnet 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. The side of the locking plate near the L-shaped rod has a plurality of toothed grooves arranged in a circular array. The side of the L-shaped rod on the shaft near the locking plate has protruding teeth that match the toothed grooves. Support plates are slidably connected to both ends of the locking plate. Each support plate is fixedly connected to the die head body. Two second guide rods are fixedly provided on the locking plate. A drive plate is fixedly provided at the other end of the two second guide rods. The drive plate is sleeved on the connecting sleeve and snapped in place. The drive plate is rotatably connected to the connecting sleeve.

[0026] Preferably, the casting mechanism includes a casting roller and a pressure roller that mates with the surface of the casting roller. There are at least two pressure rollers, which are located above the right side of the casting roller, and there is a gap between the two pressure rollers and the casting roller to press the three-layer co-extruded film cast onto the casting roller by the die head body. The distance between the lower pressure roller and the casting roller is smaller than the distance between the upper pressure roller 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 covers the surface of the roller body and is made of plastic with a microporous structure. One end of the roller body is used to connect to 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 passage pipe. 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 includes the following steps:

[0029] S1: The raw material is introduced into the material passage through the receiving pipe by three extruders, then into the feeding channel through the material passage, then into each discharge channel through the feeding channel, then into the corresponding hopper through the discharge channel, and finally into the discharge port through the hopper, where it is extruded and discharged onto the casting mechanism.

[0030] S2: When the proportions of the three layers of the diaphragm are different, the drive switching component is used to connect the power drive to an adjustment component. This adjustment component controls the material distribution plates in the die head assembly to move closer or further away from each other, so as to adjust the proportion of each material hopper at the point of convergence and extrusion at the outlet. At the same time, it controls the number of extruders working to flexibly prepare diaphragms.

[0031] S3: When the diaphragm thickness needs to be adjusted, the drive switching component is activated to connect the power drive to another adjustment component. This adjustment component controls the extrusion blocks to move closer or further apart from each other. On the one hand, it is used to adjust the proportion of each hopper at the outlet where they converge and are extruded. On the other hand, it is used to adjust the thickness of the diaphragm after it is formed, further improving the flexibility of diaphragm preparation.

[0032] The beneficial effects of this invention are as follows: By setting a movable material distribution block inside the die head body and a movable extrusion block at the discharge port, and by setting two adjustment components for controlling the driving of the material distribution block and the extrusion block respectively, and by controlling the working state of the two adjustment components through a drive switching component, the proportion of each material hopper at the discharge port convergence and extrusion position and the thickness of the diaphragm after forming are adjusted, thereby achieving flexibility in diaphragm preparation and improving the efficiency of diaphragm processing. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

[0038] Figure 5This is a three-dimensional structural diagram of the shaft according to an embodiment of the present invention.

[0039] The diagram is marked as follows:

[0040] 1. Die head body; 2. Material distribution plate; 3. Material bin; 4. Discharge channel; 5. Feed channel; 6. Material conveying block; 7. Material conveying channel; 8. Material receiving pipe; 9. Discharge port; 10. Extrusion block; 11. Heating rod; 12. Gear; 13. Shaft; 14. First guide rod; 15. Connecting plate; 16. Rack; 17. Support frame; 18. Connecting sleeve; 19. Belt synchronous pulley set; 20. Fixed cylinder; 21. Mounting frame 22. Motor; 23. L-shaped rod; 24. Rotary ring; 2. Convex shaft; 26. Bracket; 27. Switching plate; 28. Connecting arm; 29. ​​Iron block; 30. Electromagnet; 31. Locking plate; 32. Gear groove; 33. Convex tooth; 34. Support plate; 3. Second guide rod; 36. Drive plate; 37. Casting roller; 38. Pressure roller; 39. Three-layer co-extruded film; 40. Roller body; 41. Roller shell; 42. Liquid passage pipe. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0042] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only 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 assembly and a casting mechanism disposed below the extrusion assembly. The extrusion assembly includes:

[0044] The die head body has two material distribution plates slidably connected inside. The interior of the die head body is divided into three material bins by the two material distribution plates. Each material bin has multiple discharge channels at its top. The top of the die head body has three infeed channels. Each infeed channel is connected to all the discharge channels in the corresponding material bin.

[0045] The feed block is fixed on the top of the die head body. The feed block has three non-interconnected feed channels inside. One end of each feed channel is connected to the feed channel, and the other end extends out of the feed block and is provided with a receiving pipe for connecting to the extruder.

[0046] The discharge port is located at the bottom of the die head body, and the discharge port consists of two slidably connected extrusion blocks;

[0047] Two adjustment components are both disposed on one side of the die head body. The working end of one adjustment component passes through one side of the die head body and is connected to one of the material distribution plates. The working end of the other adjustment component is connected to the extrusion block. A drive switching component is provided between the two adjustment components and is connected to the two adjustment components.

[0048] In this configuration, when one adjustment component is controlled to work by the drive switching component, the other adjustment component does not work.

[0049] For example, raw materials are introduced into the material passage through the receiving pipe via three extruders, then into the feed channel, then into each of the discharge channels, and finally into the corresponding hoppers. From there, the raw materials converge at the discharge port, are extruded, and discharged onto the casting mechanism. When the proportions of the three layers of the diaphragm are different, a drive switching component connects the power drive to an adjustment component. This adjustment component controls the movement of the material distribution plates within the die assembly, moving them closer or further apart to adjust the proportion of each hopper at the discharge port. Simultaneously, it controls the number of extruders operating, allowing for flexible diaphragm production. When the diaphragm thickness needs adjustment, the drive switching component connects the power drive to another adjustment component. This adjustment component controls the movement of the extrusion blocks, moving them closer or further apart. This serves two purposes: firstly, to adjust the proportion of each hopper at the discharge port; and secondly, to adjust the thickness of the formed diaphragm, further improving the flexibility of diaphragm production.

[0050] As an optional embodiment, the interior of the die head body is provided with multiple heating rods, each of which passes through a material distribution plate at both ends.

[0051] For example, by setting a heating rod, on the one hand, the solidification of the molten material inside the die head body can be avoided, and on the other hand, the temperature of each layer after extrusion can be further increased, causing each layer to expand in the discharge port and improving the composite strength between each extruded layer.

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

[0053] A gear is mounted on one side of the die head body via a shaft. The shaft is fixedly connected to the gear, rotatably connected to the die head body, and drivingly connected to the drive switching assembly.

[0054] Two first guide rods are respectively inserted through one side of the die head body, and one end of each first guide rod is fixedly connected to the material distribution plate;

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

[0056] For example, by driving the switching component to rotate the shaft, 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 material distribution plate to move, thereby adjusting the proportion between the various hoppers.

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

[0058] A support frame is fixed to one side of the die head body. Two connecting sleeves are provided on the side of the support frame away from the die head body, and each connecting sleeve is respectively sleeved on the shaft.

[0059] A belt-type synchronous pulley set is disposed on the side of the support frame away from the die head body. The two pulleys of the belt-type synchronous pulley set are respectively sleeved on the connecting sleeve and connected by a snap-key structure. A fixed cylinder is rotatably connected to one side of each of the two pulleys of the belt-type synchronous pulley set. Each fixed cylinder is respectively sleeved on the connecting sleeve and each fixed cylinder is fixedly connected to the support frame.

[0060] A mounting bracket is fixed on the support frame, and a motor is fixed on the mounting bracket. The output shaft of the motor passes through the mounting bracket and is inserted into a connecting sleeve. The output shaft of the motor is connected to the connecting sleeve by a snap-key structure.

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

[0062] Two rotating rings are respectively fitted onto the connecting sleeve and snapped together. Each rotating ring is rotatably connected to the connecting sleeve, and each rotating ring is fixed with two protruding shafts.

[0063] Two brackets are fixed on the mold head body. A switching plate is provided between the two brackets. The middle part of the switching plate is rotatably connected to the two brackets. Two connecting arms are provided at both ends of the switching plate. Each connecting arm is provided with an oblong through hole. Each oblong through hole is respectively sleeved on the convex shaft.

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

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

[0066] For example, by energizing the corresponding electromagnet to attract the corresponding iron block, one end of the switching plate is raised and the other end is lowered. The oblong through hole at the lowered end of the switching plate, in conjunction with the convex shaft, drives the connecting arm to move. The connecting arm drives the corresponding rotating ring to move, the rotating ring drives the connecting sleeve to move, and the connecting sleeve drives the L-shaped rod to move, which abuts against and crosses the L-shaped rod on the shaft. The two L-shaped rods at the raised end of the switching plate move away from each other and do not interfere with each other. At this time, the motor drives the connecting sleeve to rotate, and the connecting sleeve drives the belt synchronous pulley set to work. Although the belt synchronous pulley set drives the two connecting sleeves to rotate synchronously, through the cooperation of the L-shaped rod, one gear rotates while the other gear does not rotate, thereby controlling the movement of the material distribution plate or extrusion block.

[0067] As an optional embodiment, a locking plate is provided between the L-shaped rod on the shaft and the gear. The locking plate is sleeved on the shaft. The side of the locking plate near the L-shaped rod has a plurality of toothed grooves arranged in a circular array. The side of the L-shaped rod on the shaft near the locking plate has protruding teeth that match the toothed grooves. Support plates are slidably connected to both ends of the locking plate. Each support plate is fixedly connected to the die head body. Two second guide rods are fixedly provided on the locking plate. A drive plate is fixedly provided at the other end of the two second guide rods. The drive plate is sleeved on the connecting sleeve and snapped in place. The drive plate is rotatably connected to the connecting sleeve.

[0068] For example, when the two L-shaped rods corresponding to the tilted end of the switching plate are far apart and do not interfere with each other, the connecting sleeve drives the drive plate to move. The drive plate drives the locking plate to move on the side of the L-shaped rod close to the shaft through the second guide rod. Through the engagement of the tooth groove and the convex tooth, the L-shaped rod is locked on the locking plate, so that the shaft is locked and does not rotate, thereby further locking the material distribution plate or the extrusion block, avoiding different pressure inside each hopper, which would cause the ratio data of each layer in the diaphragm production to be unstable.

[0069] As an optional embodiment, the casting mechanism includes a casting roller and a pressure roller that mates with the surface of the casting roller. There are at least two pressure rollers, which are located above the right side of the casting roller, and there is a gap between the two pressure rollers and the casting roller for pressing the three-layer co-extruded film cast onto the casting roller by the die head body. The distance between the lower pressure roller and the casting roller is smaller than the distance between the upper pressure roller 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 covers the surface of the roller body and is made of plastic with a microporous structure. One end of the roller body is used to connect to 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 passage pipe. 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 through the through hole and flow from the microporous structure of the roller shell to the surface of the casting roller. On the one hand, it maintains the temperature of the casting roller, enabling the casting roller to 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 conducive to the peeling of the three-layer co-extruded film after cooling. At the same time, it ensures the cleanliness of the casting roller, enabling the device to carry out continuous production. In addition, by setting up a liquid pipe connection, the cooling liquid can be recycled, improving the utilization rate of the cooling liquid.

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

[0073] S1: The raw material is introduced into the material passage through the receiving pipe by three extruders, then into the feeding channel through the material passage, then into each discharge channel through the feeding channel, then into the corresponding hopper through the discharge channel, and finally into the discharge port through the hopper, where it is extruded and discharged onto the casting mechanism.

[0074] S2: When the proportions of the three layers of the diaphragm are different, the drive switching component is used to connect the power drive to an adjustment component. This adjustment component controls the material distribution plates in the die head assembly to move closer or further away from each other, so as to adjust the proportion of each material hopper at the point of convergence and extrusion at the outlet. At the same time, it controls the number of extruders working to flexibly prepare diaphragms.

[0075] S3: When the diaphragm thickness needs to be adjusted, the drive switching component is activated to connect the power drive to another adjustment component. This adjustment component controls the extrusion blocks to move closer or further apart from each other. On the one hand, it is used to adjust the proportion of each hopper at the outlet where they converge and are extruded. On the other hand, it is used to adjust the thickness of the diaphragm after it is formed, 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 merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A three-layer co-extrusion diaphragm casting machine with ultra-wide width, comprising an extrusion assembly and a casting mechanism disposed below the extrusion assembly, characterized in that, The extrusion assembly includes: The mold head body (1) has two material distribution plates (2) slidably connected inside. The interior of the mold head body (1) is divided into three material bins (3) by the two material distribution plates (2). Each material bin (3) has multiple discharge channels (4) at its top. The mold head body (1) has three feeding channels (5) at its top. Each feeding channel (5) is connected to all the discharge channels (4) in the corresponding material bin (3). The feed block (6) is fixed on the top of the die head body (1). The feed block (6) has three non-interconnected feed channels (7) inside. One end of each feed channel (7) is connected to the feed channel (5), and the other end extends out of the feed block (6) and is provided with a receiving pipe (8) for connecting to the extruder. The discharge port (9) is located at the bottom of the die head body (1), and the discharge port (9) consists of two slidably connected extrusion blocks (10); Two adjustment components are both located on one side of the die head body (1). The working end of one adjustment component passes through one side of the die head body (1) and is connected to one of the material distribution plates (2). The working end of the other adjustment component is connected to the extrusion block (10). A drive switching component is provided between the two adjustment components. The drive switching component is connected to the two adjustment components. In this scenario, when one adjustment component is controlled by the drive switching component, the other adjustment component is not in operation; The adjustment component includes: The gear (12) is disposed on one side of the mold head body (1) via a shaft (13). The shaft (13) is fixedly connected to the gear (12), the shaft (13) is rotatably connected to the mold head body (1), and the shaft (13) is drive-connected to the drive switching assembly. Two first guide rods (14) are respectively inserted through one side of the die head body (1), and one end of each first guide rod (14) is fixedly connected to the material distribution plate (2); Two connecting plates (15) are respectively fixedly connected at one end to the end of the first guide rod (14) away from the material distribution plate (2), and the other end is fixedly provided with a rack (16). Each rack (16) is slidably connected to one side of the mold head body (1), and each rack (16) meshes with the gear (12). The drive switching component includes: A support frame (17) is fixed on one side of the mold head body (1). Two connecting sleeves (18) are provided on the side of the support frame (17) away from the mold head body (1). Each connecting sleeve (18) is respectively sleeved on the shaft (13). A belt-type synchronous pulley set (19) is set on the side of the support frame (17) away from the mold head body (1). The two pulleys of the belt-type synchronous pulley set (19) are respectively sleeved on the connecting sleeve (18) and connected by a snap-key structure. A fixed cylinder (20) is rotatably connected to one side of each of the two pulleys of the belt-type synchronous pulley set (19). Each fixed cylinder (20) is respectively sleeved on the connecting sleeve (18) and each fixed cylinder (20) is fixedly connected to the support frame (17). Mounting bracket (21) is fixed on the support frame (17). A motor (22) is fixed on the mounting bracket (21). The output shaft of the motor (22) passes through the mounting bracket (21) and is inserted into a connecting sleeve (18). The output shaft of the motor (22) is connected to the connecting sleeve (18) through a key structure. Two L-shaped rods (23) are respectively fixed at one end on the connecting sleeve (18) and the shaft (13), and the other ends are arranged close to each other in a symmetrical manner; Two rotating rings (24) are respectively fitted onto the connecting sleeve (18) and snapped together. Each rotating ring (24) is rotatably connected to the connecting sleeve (18), and each rotating ring (24) is fixed with two protruding shafts (25). Two brackets (26) are fixed on the mold head body (1). A switching plate (27) is provided between the two brackets (26). The middle part of the switching plate (27) is rotatably connected to the two brackets (26). Two connecting arms (28) are provided at both ends of the switching plate (27). Each connecting arm (28) is provided with a waist-shaped through hole. Each waist-shaped through hole is respectively sleeved on the convex shaft (25). Two iron blocks (29) are fixed to the top of one end of the switching plate (27); Two electromagnets (30) are respectively disposed above the iron block (29), and each electromagnet (30) is fixedly connected to the support frame (17); A locking plate (31) is provided between the L-shaped rod (23) on the shaft (13) and the gear (12). The locking plate (31) is sleeved on the shaft (13). The locking plate (31) has multiple tooth grooves (32) arranged in a ring array on the side of the L-shaped rod (23). The L-shaped rod (23) on the shaft (13) has protruding teeth (33) that are adapted to the tooth grooves (32) on the side of the locking plate (31). Support plates (34) are slidably connected to both ends of the locking plate (31). Each support plate (34) is fixedly connected to the die head body (1). Two second guide rods (35) are fixed on the locking plate (31). A drive plate (36) is fixed at the other end of the two second guide rods (35). The drive plate (36) is sleeved on the connecting sleeve (18) and snapped in place. The drive plate (36) is rotatably connected to the connecting sleeve (18).

2. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 1, characterized in that, The mold head body (1) is provided with a plurality of heating rods (11) inside, and each heating rod (11) passes through a material distribution plate (2) at both ends.

3. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 1, characterized in that, The casting mechanism includes a casting roller (37) and a pressure roller (38) that mates with the surface of the casting roller (37). There are at least two pressure rollers (38), which are located on the upper right side of the casting roller (37). There is a gap between the two pressure rollers (38) and the casting roller (37) for pressing the three-layer co-extruded film (39) cast onto the casting roller (37) by the die head body (1). The distance between the lower pressure roller (38) and the casting roller (37) is smaller than the distance between the upper pressure roller (38) and the casting roller (37).

4. The ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 3, characterized in that, The casting roller (37) includes a roller body (40) and a roller shell (41). The roller body (40) and the pressure roller (38) are hollow structures. The surface of the roller body (40) is provided with several through holes. The roller shell (41) covers the surface of the roller body (40). The roller shell (41) is made of plastic with a microporous structure. One end of the roller body (40) is used to connect to the cooling liquid introduced into the roller body (40). The other end is connected to one end of the pressure roller (38) and is provided with a liquid pipe (42). The other end of the pressure roller (38) is used to connect to the cooling liquid storage device.

5. The method of using an ultra-wide three-layer co-extrusion diaphragm casting machine according to claim 1, characterized in that, Includes the following steps: S1: The raw material is introduced into the material passage (7) through the receiving pipe (8) by three extruders, then into the feeding passage (5) through the material passage (7), then into each discharge passage (4) through the feeding passage (5), then into the corresponding hopper (3) through the discharge passage (4), and finally into the discharge port (9) through the hopper (3) and extruded and discharged onto 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 the drive switching component. The adjustment component controls the material distribution plates (2) in the die head assembly to move closer or further away from each other, so as to adjust the proportion of each material bin (3) at the discharge port (9) where they converge and are extruded. At the same time, it controls the number of extruders working, so as to flexibly prepare diaphragms. S3: When the diaphragm thickness needs to be adjusted, the power drive is connected to another adjustment component by the drive switching component. This adjustment component controls the extrusion blocks (10) to move closer or further away from each other. On the one hand, it is used to adjust the proportion of each hopper (3) at the discharge port (9) where they converge and are extruded. On the other hand, it is used to adjust the thickness of the diaphragm after it is formed, which further improves the flexibility of diaphragm preparation.

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