Proton exchange membrane surface base layer coating die head

Abstract

According to the technical scheme, the proton exchange membrane surface base layer coating die head comprises a left die body, a right die body and a gasket located between the left die body and the right die body which are vertically arranged, the left die body, the right die body and the gasket are connected into a whole through die locking screws, and a buffer groove is formed in the middle area of the inner side face of the right die body in the breadth direction. The gaskets are distributed on the upper portion, the left side and the right side of the buffer groove between the two die bodies, a feeding channel is formed in the middle of the top face of the right die body, the feeding channel penetrates into the right die body and then is communicated with the middle area of the buffer groove, and exhaust holes are vertically formed in the front side and the rear side of the top face of the right die body. The front exhaust hole and the rear exhaust hole are communicated with the top faces of the left end and the right end of the buffer groove respectively, an extrusion channel is formed between the two die bodies below the buffer groove under the guidance of the gasket, the thickness of the extrusion channel corresponds to the thickness of the gasket, and a die lip and a die lip gap fine adjustment mechanism are arranged at the lower end of the left die body. According to the invention, the coating thickness precision of the extrusion channel in different breadth directions can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coating die heads, in particular to a coating die head for a base layer on the surface of a proton exchange membrane. Background Art

[0002] The surface of the proton exchange membrane needs to be coated with a catalytic base layer and a gas diffusion layer for the production of membrane electrodes used in the process of electrolysis of water to produce hydrogen. The membrane electrode consists of a proton exchange layer, a catalyst layer, a gas diffusion layer, etc. The catalyst layer is coated as a slurry on the substrate of the perfluorosulfonic acid membrane, and the gas diffusion layer is coated on carbon paper.

[0003] The current die head is limited by the machining capabilities, and the straightness and flatness of the lip and the flatness of the gasket are difficult to achieve the ideal state. There are slight errors, which will cause slight deformation at the lip, thereby affecting the uniformity of the coating thickness and the accuracy of the coating thickness. Summary of the invention

[0004] In view of the above problems, the present invention aims to provide a proton exchange membrane surface base coating die head, which can ensure uniform coating thickness in different width directions of the extrusion channel and ensure the quality of the extruded product.

[0005] The technical solution of the present invention is a proton exchange membrane surface base coating die head, characterized in that it includes a vertically arranged left mold body, a right mold body and a gasket located between the two, the above three are connected as a whole by a locking screw, a buffer groove is opened in the middle area of ​​the inner side surface of the right mold body along the width direction, the gasket is distributed in the upper part and left and right side areas of the buffer groove between the two mold bodies, a feed channel is opened in the middle of the top surface of the right mold body, and the feed channel is connected with the middle area of ​​the buffer groove after passing through the inside of the right mold body, exhaust holes are vertically arranged on the front and rear sides of the top surface of the right mold body, and the front and rear exhaust holes are respectively connected to the top surfaces of the left and right ends of the buffer groove, an extrusion channel is formed between the two mold bodies below the buffer groove under the guidance of the gasket, and the thickness of the extrusion channel corresponds to the thickness of the gasket, and a die lip and a die lip gap fine-tuning mechanism are provided at the lower end of the left mold body.

[0006] Preferably, the top surface of the right mold body is provided with two left and right articulated frames, and the top surface of the left mold body is provided with an articulated seat at the position corresponding to the articulated frame. The articulated seat is hinged to the articulated frame through a hinge axis, and a pull rod extends from the left side of the articulated seat. By pulling the pull rod upwards, the left mold body is flipped upward and opened relative to the right mold body along the hinge axis through the lever principle.

[0007] Preferably, left and right regions of the top surfaces of the left and right mold bodies are respectively connected with locking modules, and the locking modules are respectively connected to the top surfaces of the left and right mold bodies by left and right screws to lock the two mold bodies.

[0008] Preferably, the die lip gap fine-tuning mechanism includes a deformation groove arranged on the front side of the left die body, a threaded mounting hole located on the upper left side of the deformation groove, an adjusting nut threadedly connected in the threaded mounting hole, and an adjusting screw threadedly connected in the inner hole of the adjusting nut. The pitch of the external thread of the adjusting nut is greater than the pitch of the internal thread. After the front end of the adjusting screw passes through the deformation groove, it is threadedly connected to the die lip. Rotating the adjusting nut advances or retreats the adjusting screw through thread differential to deform the die lip, thereby adjusting the gap of the extrusion channel.

[0009] The present invention can ensure the coating thickness accuracy of the extrusion channel in different width directions, discharge the air mixed in the raw materials, and eliminate bubbles. The left mold body can be rotated and opened after the locking screw and the locking module are disassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 An exploded view of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Among them: 1—left mold body; 1a—die lip; 1b—deformation groove; 1c—threaded mounting hole; 2—right mold body; 21—buffer groove; 22—feed channel; 23—exhaust hole; 3—gasket; 4—locking screw; 5—extrusion channel; 6—die lip gap fine-tuning mechanism; 61—adjusting nut; 62—adjusting screw; 7—articulated frame; 8—articulated seat; 9—articulated shaft; 10—pull rod; 11—locking module. DETAILED DESCRIPTION

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0012] like Figures 1 to 3 As shown, the present invention provides a proton exchange membrane surface base coating die head, comprising a vertically arranged left mold body 1, a right mold body 2 and a gasket 3 located therebetween, the three being connected as a whole by a locking screw 4, a buffer groove 21 being provided in the middle area of ​​the inner side surface of the right mold body 2 along the width direction, the gasket 3 being distributed in the upper part and left and right side areas of the buffer groove 21 between the two mold bodies, a feed channel 22 being provided in the middle part of the top surface of the right mold body 2, the feed channel 22 being connected with the middle area of ​​the buffer groove 21 after penetrating into the right mold body 2, exhaust holes 23 being vertically provided on the front and rear sides of the top surface of the right mold body 2, the front and rear exhaust holes 23 being respectively connected with the top surfaces of the left and right ends of the buffer groove 21, an extrusion channel 5 being formed between the two mold bodies below the buffer groove 21 under the guidance of the gasket 3, the thickness of the extrusion channel 5 corresponding to the thickness of the gasket 3, and a die lip 1a and a die lip gap fine-tuning mechanism 6 being provided at the lower end of the left mold body 1.

[0013] In the above scheme, the top surface of the right mold body 2 is provided with two left and right articulated frames 7, and the top surface of the left mold body 1 is provided with an articulated seat 8 at the position corresponding to the articulated frame 7. The articulated seat 8 is hinged to the articulated frame 7 through a hinge axis 9. A pull rod 10 extends from the left side of the articulated seat 8. By pulling the pull rod 10 upwards, the left mold body 1 is flipped upward and opened relative to the right mold body 2 along the hinge axis 9 through the lever principle.

[0014] Specifically, the left and right regions of the top surfaces of the left mold body 1 and the right mold body 2 are respectively connected with locking modules 11, and the locking modules 11 are respectively connected to the top surfaces of the left mold body 1 and the right mold body 2 by two left and right screws to lock the two mold bodies.

[0015] Furthermore, the die lip gap fine-tuning mechanism 6 includes a deformation groove 1b arranged on the front side of the left die body 1, a threaded mounting hole 1c located on the upper left side of the deformation groove 1b, an adjusting nut 61 threadedly connected to the threaded mounting hole 1c, and an adjusting screw 62 threadedly connected to the inner hole of the adjusting nut 61. The pitch of the outer thread of the adjusting nut 61 is greater than the pitch of the inner thread. The front end of the adjusting screw 62 passes through the deformation groove 1b and is threadedly connected to the die lip 1a. The adjusting nut 61 is rotated to move the adjusting screw 62 forward or backward through the thread differential to deform the die lip 1a, thereby adjusting the gap of the extrusion channel 5. The pitch of the outer thread of the adjusting nut 51 is m, and the pitch of the inner thread is n. When the adjusting nut 51 is rotated one circle, the forward or backward distance of the adjusting screw 52 is mn.

[0016] In the present invention, the raw material enters from the feed channel 22 in the middle of the top surface of the right mold body 2, enters the buffer groove 21 and diffuses in the front and rear width direction, and finally fills the entire buffer groove 21. In this process, the air is discharged from the downward channel and discharged through the exhaust hole 23. After passing through the buffer groove 21, the velocity vectors of the raw material flowing downward at different positions in the width direction tend to be consistent, ensuring the uniform extrusion of the raw material in the entire width direction, and finally the extrusion channel 5 through the lip gap is evenly coated on the substrate to form a dense coating. During the extrusion process, the mixed bubbles in the raw material are discharged through the exhaust hole 23 in time. The gap of the extrusion channel 5 is adjusted by rotating the adjusting nut 61, and the adjusting screw 62 is moved forward or backward by differential means to adjust the gap size of the extrusion channel 5. When demolding, it is only necessary to remove the locking screw 4 and the locking module 11, and pull the pull rod 10 outward to make the left mold body 1 flip upward relative to the right mold body 2 along the hinge axis 9 through the lever principle.

[0017] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the invention. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A proton exchange membrane surface base coating die head, characterized in that: The invention comprises a left mold body (1), a right mold body (2) and a gasket (3) located between the two mold bodies, the three being connected as a whole by a locking screw (4); a buffer groove (21) is provided in the middle area of ​​the inner side surface of the right mold body (2) along the width direction; the gasket (3) is distributed in the upper part and left and right side areas of the buffer groove (21) between the two mold bodies; a feed channel (22) is provided in the middle of the top surface of the right mold body (2); the feed channel (22) penetrates into the right mold body (2) and is connected to the buffer groove. The middle area of ​​the punching groove (21) is connected, and the front and rear sides of the top of the right mold body (2) are vertically provided with exhaust holes (23), and the front and rear exhaust holes (23) are respectively connected to the top surfaces of the left and right ends of the buffer groove (21). An extrusion channel (5) is formed between the two mold bodies below the buffer groove (21) under the guidance of the gasket (3), and the thickness of the extrusion channel (5) corresponds to the thickness of the gasket (3). The lower end of the left mold body (1) is provided with a die lip (1a) and a die lip gap fine-tuning mechanism (6).

2. A proton exchange membrane surface base coating die head according to claim 1, characterized in that: The top surface of the right mold body (2) is provided with two left and right hinged frames (7), and the top surface of the left mold body (1) is provided with a hinged seat (8) at a position corresponding to the hinged frame (7). The hinged seat (8) is hinged to the hinged frame (7) via a hinge shaft (9), and a pull rod (10) extends from the left side of the hinged seat (8). When the pull rod (10) is pulled upward, the left mold body (1) is flipped upward along the hinge shaft (9) relative to the right mold body (2) through the lever principle.

3. The proton exchange membrane surface base coating die head according to claim 1, characterized in that: The left and right regions of the top surfaces of the left mold body (1) and the right mold body (2) are respectively connected to locking modules (11), and the locking modules (11) are respectively connected to the top surfaces of the left mold body (1) and the right mold body (2) by means of two left and right screws to lock the two mold bodies.

4. The proton exchange membrane surface base coating die head according to claim 1, characterized in that: The die lip gap fine-adjusting mechanism (6) comprises a deformation groove (1b) arranged on the front side of the left die body (1), a threaded mounting hole (1c) located on the upper left side of the deformation groove (1b), an adjusting nut (61) threadedly connected in the threaded mounting hole (1c), and an adjusting screw (62) threadedly connected in the inner hole of the adjusting nut (61); the pitch of the outer thread of the adjusting nut (61) is greater than the pitch of the inner thread; the front end of the adjusting screw (62) passes through the deformation groove (1b) and is threadedly connected to the die lip (1a); the adjusting nut (61) is rotated to cause the adjusting screw (62) to move forward or backward through thread differential, so that the die lip (1a) is deformed, thereby adjusting the gap of the extrusion channel (5).

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