CN113119516A

CN113119516A - Forming and demolding mechanism and method for graphite polar plate

Info

Publication number: CN113119516A
Application number: CN202010035446.3A
Authority: CN
Inventors: 王想; 甘全全; 戴威
Original assignee: Shanghai Shen Li High Tech Co Ltd
Current assignee: Shanghai Shenli Technology Co Ltd
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2021-07-16

Abstract

The invention provides a forming and demolding mechanism for a graphite polar plate and a method thereof, wherein the forming and demolding mechanism comprises: a base; a lower platform disposed on the base and configured to move in a vertical direction with respect to the base, the lower platform being provided with a positioning protrusion protruding from one side of the lower platform body; the lower die is arranged on the lower platform and is arranged to move in the vertical direction relative to the lower platform, and a positioning hole for accommodating the positioning protrusion is formed in the lower die; and an upper mold disposed above the lower mold and moving in a vertical direction with respect to the upper mold. The finished demoulding mechanism for the graphite polar plate not only can enable the forming size of the flexible graphite to be accurate, but also improves the quality of polar plate compression molding and greatly improves the yield of compression molding.

Description

Forming and demolding mechanism and method for graphite polar plate

Technical Field

The invention relates to the field of fuel cells, in particular to a forming and demolding mechanism and a forming and demolding method for a graphite polar plate.

Background

The proton exchange membrane fuel cell is an energy conversion device which directly converts chemical energy of fuel into electric energy, and has the advantages of high energy density, high energy conversion efficiency, zero emission and the like.

The bipolar plate is one of the internal core components of the fuel cell. In order to ensure efficient and stable operation of the fuel cell for a long time, the bipolar plate needs to satisfy the following functions: (1) a cell conductor connecting the single cells in series through a bipolar plate to constitute a fuel cell stack; (2) the reaction gas transmission channel supplies reaction gas to the membrane electrode through the bipolar plate flow channel; (3) the cooling liquid transmission channel is used for managing water and heat of the fuel cell stack through the bipolar plate cooling flow channel; (4) mechanical structural support providing structural strength support to the Membrane Electrode Assembly (MEA); (5) corrosion resistance to fuel, oxidant, electrolyte membrane, etc. is required.

The bipolar plate is made of flexible graphite raw materials through compression molding, and is an option of the bipolar plate. In the prior art, the bipolar plate manufactured by using flexible graphite raw materials is manufactured by rolling expanded graphite into a low-density flat plate, then molding the flat plate into a polar plate with grooves on two sides, then impregnating the molded polar plate with a resin solution, curing and drying the impregnated polar plate, and finally bonding the polar plate into the bipolar plate with a cathode cavity, an anode cavity and a cooling liquid cavity. The defects of the prior art are as follows: when the polar plate with grooves on two sides is formed, the porous low-density flexible graphite raw material is a densified compression process, in the process, the opening hole of the flexible graphite raw material is closed, and the materials on the periphery of the positioning process boss and the gas distribution process boss are extruded to a certain degree. The material around the boss is easy to be damaged when the pole plate is taken out after being formed. This dimensional and structural damage has a large effect on the gas permeability and gas distribution of the bipolar plate.

Disclosure of Invention

In order to solve the problems, the invention provides a forming and demolding mechanism and a forming and demolding method for a graphite pole plate, which can conveniently and quickly demold the graphite pole plate subjected to compression molding and ensure the forming quality.

In order to achieve the above object, the present application provides a molding and demolding mechanism for a graphite electrode plate, the molding and demolding mechanism comprising: a base; a lower platform disposed on the base and configured to move in a vertical direction with respect to the base, the lower platform being provided with a positioning protrusion protruding from one side of the lower platform body; the lower die is arranged on the lower platform and is arranged to move in the vertical direction relative to the lower platform, and a positioning hole for accommodating the positioning protrusion is formed in the lower die; and an upper mold disposed above the lower mold and moving in a vertical direction with respect to the upper mold.

Further, the forming and demolding mechanism further comprises a demolding driving piece, wherein the demolding driving piece is arranged on the lower platform and located below the lower platform and used for driving the lower mold to move along the vertical direction relative to the lower platform.

Further, the molding and demolding mechanism further comprises a guide post disposed between the base and the upper mold, the guide post passing through the lower platform and the lower mold, the lower platform and the lower mold being disposed to move between the base and the upper mold along the guide post.

Further, a forming driving piece is arranged on the base and used for driving the lower platform to move along the guide post.

Further, the lower die is provided with a second piston portion provided to protrude from the lower die body, the knock out driving member is provided with a second accommodating portion accommodating the second piston portion, and the knock out driving member is provided to reciprocate the second piston portion in the second accommodating portion.

Further, the lower deck is provided with a first piston portion protruding from the other side of the lower deck body, and the mold driving member is provided with a first housing portion housing the first piston portion, the mold driving member being provided so that the first piston portion reciprocates in the first housing portion.

Furthermore, a groove for accommodating the positioning protrusion is arranged on the upper die.

Further, the lower die is provided with a blowing hole so as to blow air to the upper surface of the lower die.

Further, the molding and demolding mechanism further comprises an upper pressing plate, and the upper mold is arranged on the upper pressing plate.

According to another aspect of the present application, there is provided a molding and demolding method for a graphite electrode plate, wherein the molding and demolding method uses the molding and demolding mechanism, and the molding and demolding method includes: placing a graphite raw material on the lower die and positioning the graphite raw material through the positioning bulges on the lower platform; the lower platform drives the lower die to move upwards so as to carry out die pressing and laminating with the upper die; after the mould pressing and laminating, the lower platform moves downwards, and the lower mould is separated from the upper mould; and moving the lower mold in an upward direction to raise the lower mold to be at least flush with the positioning protrusion.

The finished demoulding mechanism for the graphite polar plate not only can enable the forming size of the flexible graphite to be accurate, but also improves the quality of polar plate compression molding and greatly improves the yield of compression molding.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a molding and demolding mechanism according to a preferred embodiment of the present application;

fig. 2 is a schematic front sectional view of the molding and demolding mechanism shown in fig. 1;

fig. 3 is a side sectional view schematically showing the molding and releasing mechanism shown in fig. 1.

Wherein the figures include the following reference numerals:

1. a base; 2. an upper pressure plate; 3. a lower platform; 4. an upper die; 5. a lower die; 6. a flexible graphite raw material; 7. a demolding driving member; 8. a guide post; 11. molding a driving member; 12. a first accommodating portion; 31. a through hole; 32. positioning the projection; 33. a first piston portion; 41. a groove; 51. a gas blowing hole; 52. a second piston portion; 53. positioning holes; 71. a second accommodating portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The invention provides a forming and demolding mechanism for a graphite polar plate, which comprises: a base; a lower platform disposed on the base and configured to move in a vertical direction with respect to the base, the lower platform being provided with a positioning protrusion protruding from one side of the lower platform body; the lower die is arranged on the lower platform and is arranged to move in the vertical direction relative to the lower platform, and a positioning hole for accommodating the positioning protrusion is formed in the lower die; and an upper mold disposed above the lower mold and moving in a vertical direction with respect to the upper mold.

Fig. 1 shows a schematic structural view of a molding and demolding mechanism according to a preferred embodiment of the present application. Fig. 2 is a schematic front sectional view of the mold and release mechanism shown in fig. 1. Fig. 3 is a side sectional view schematically showing the molding and releasing mechanism shown in fig. 1.

As shown, the form and release mechanism includes a base 1 at the bottom and a lower platform 3 carried by the base 1. The lower platform 3 can move up and down along the vertical direction relative to the base 1, the lower die 5 is arranged on the lower platform 3, the lower die 5 can move along the vertical direction relative to the lower platform 3, and the graphite raw material is placed on the lower die 5. An upper mold 4 is disposed above the lower mold 5, and the upper mold 4 is disposed on the upper platen 2. The base 1 is further provided with a guide post 8, the guide post 8 penetrates through the lower platform 3 and the lower die 5 from the base 1 to be connected with the upper die 4, and the lower platform 3 and the lower die 5 can move up and down along the guide post 8.

The base 1 is provided with a molded driving member 11, and the molded driving member 11 can drive the lower platform 3 to move up and down along the vertical direction (or the guide post 8). According to a preferred embodiment of the present application, a cylinder may be used as the molded actuator 11.

As shown in fig. 2, the base 1 is provided with a molded driving member 11, the molded driving member 11 is provided with a first accommodating portion 12, the lower stage 3 is provided with a first piston portion 33 provided to protrude from one side of the body of the lower stage 3, and the first piston portion 33 is accommodated in the first accommodating portion 12 and provided to be capable of reciprocating in the first accommodating portion 12. According to an embodiment of the present application, the first piston portion 33 is caused to reciprocate in the first accommodation portion 12 by introducing gas into the first accommodation portion 12, thereby moving the entire lower platform 3 in the vertical direction with respect to the base 1. The lower platen 3 is further provided with a positioning boss 32 protruding from the side of the lower platen 3 opposite to the side where the first piston portion 33 is provided, and the positioning boss 32 is used for positioning the lower die 5 and the graphite raw material.

As shown, the forming and demolding mechanism further comprises a lower mold 5 providing a reverse groove of the flexible graphite pole plate, the lower mold 5 is arranged on the lower platform 3, and the lower mold 5 can move along a vertical direction relative to the lower platform 3. The forming and demolding mechanism is further provided with a demolding driving member 7 for driving the lower mold 5 to move, and the demolding driving member 7 is arranged on the lower platform 3 and located below the lower platform 3. The demoulding driving piece 7 and the lower mould 5 are respectively arranged at two opposite sides of the lower platform 3. According to a preferred embodiment of the present application, a pneumatic cylinder may be used as the ejector driver 7.

Specifically, as shown in the drawing, the ejector driver 7 includes a second accommodation portion 71, the second accommodation portion 71 is fixedly disposed below the lower platen 3, and the lower die 5 is capable of reciprocating in the second accommodation portion 71. Specifically, the lower die 5 is provided with a second piston portion 52 provided to protrude from the body of the lower die 5, the second piston portion 52 passing through a through hole 31 provided on the lower platen 3, being accommodated in a second accommodation portion 71, and being capable of reciprocating in the second accommodation portion 71. According to an embodiment of the present application, the second piston portion 52 is caused to reciprocate in the second accommodation portion 71 by supplying gas into the second accommodation portion 71, thereby moving the entire lower mold 5 in the vertical direction with respect to the lower platen 3. The lower mold 5 is further provided with a positioning hole 53 through which the positioning protrusion 32 of the lower platen 3 passes and a gas blowing hole 51 (shown in fig. 1) for blowing gas to the graphite electrode plate, and the gas blowing hole 51 can blow gas to the upper surface of the lower mold.

The forming and demolding mechanism is further provided with an upper pressing plate 2 and an upper mold 4 arranged on the upper pressing plate 2, the upper mold 4 and the upper pressing plate 2 are arranged above the lower mold 5 and the lower platform 3, and the upper mold 4 is provided with a groove in the front face of the flexible graphite pole plate. Guide posts 8 on the base 1 pass from the base 1 through the lower platen 3 and the lower die 5 and are disposed between the base 1 and the upper die 4. And, the upper mold 4 is provided with a groove 41, and the positioning protrusion 32 of the lower stage 3 is received in the groove 41 of the upper mold 4 when the upper mold 4 is pressed against the lower mold 5.

As shown in the figure, one end of a guide post 8 of the forming and demolding mechanism is arranged on the base 1 and penetrates through holes in the lower platform 3 and the lower mold 5, and the other end of the guide post is connected and arranged on the upper mold 4 and used for guiding the movement of the lower platform 3 and the lower mold 5.

The molding and demolding method for molding and demolding the graphite raw material by press molding using the molding and demolding mechanism described above is described in detail below.

The forming driving member 11 drives the lower platform 3 to drive the lower mold 5 to move along the guide post 8 in the direction away from the upper mold 4, the upper mold 4 and the lower mold 5 are opened, and the flexible graphite raw material 6 is placed on the lower mold 5 and positioned based on the positioning protrusion 32 on the lower platform 3. Then, the forming driving member 11 drives the lower platform 3 to move along the guide post 8 toward the direction close to the upper mold 4, and combines with the upper mold 4 to press and press the graphite raw material, and the pressing force is in the range of 100T-400T, so that the graphite raw material is pressed and molded. After the press-molding and pressing, the forming driving member 11 drives the lower platform 3 to move along the guide post 8 in a direction away from the upper mold 4, and the upper mold 4 and the lower mold 5 are opened. Thereafter, the lower mold 5 is driven by the ejector driver 7 to move along the guide post 8 in a direction away from the lower stage 3 (in an upward direction in fig. 2), and the lower mold 5 is raised to be at least flush with the positioning projection 32 of the lower stage 3. And opening an air source of the demoulding air blowing interface, and connecting an air blowing hole 51 of the lower mould 5 to blow the formed graphite pole plate, wherein the pressure of the air source is within the range of 0.2MPa-0.5MPa, so that the pole plate with the double-sided groove is automatically separated from the lower mould for mould pressing after mould pressing forming, and the automatic demoulding process is completed.

The forming and demolding mechanism can guarantee that the size of the pole plate with the double-sided groove is accurate after forming, and does not have locating protrusion blocking during demolding, so that nondestructive demolding of the pole plate with the double-sided groove can be guaranteed.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shaping demoulding mechanism for graphite polar plate, its characterized in that, shaping demoulding mechanism includes:

a base (1);

a lower platform (3), wherein the lower platform (3) is arranged on the base (1), the lower platform (3) is arranged to move along the vertical direction relative to the base (1), and the lower platform (3) is provided with a positioning bulge (32) which is arranged in a protruding mode from one side of the body of the lower platform (3);

a lower die (5), wherein the lower die (5) is arranged on the lower platform (3), the lower die (5) is arranged to move along the vertical direction relative to the lower platform (3), and a positioning hole (53) for accommodating the positioning protrusion (32) is arranged on the lower die (5); and

an upper mold (4), the upper mold (4) being disposed above the lower mold (5), and the lower mold (5) moving in a vertical direction with respect to the upper mold (4).

2. The forming and demolding mechanism for graphite electrode plates according to claim 1, further comprising a demolding driving member (7), wherein the demolding driving member (7) is arranged on the lower platform (3) and below the lower platform (3) and used for driving the lower mold (5) to move along a vertical direction relative to the lower platform (3).

3. The forming and demoulding mechanism for graphite plates according to claim 1, further comprising guide posts (8) arranged between the base (1) and the upper mould (4), the guide posts (8) passing through the lower platform (3) and the lower mould (5), the lower platform (3) and the lower mould (5) being arranged to move along the guide posts (8) between the base (1) and the upper mould (4).

4. The forming and demoulding mechanism for graphite pole plates according to claim 3, characterized in that a forming driving member (11) is arranged on the base (1), and the forming driving member (11) is used for driving the lower platform (3) to move along the guide pillar (8).

5. The molding and demolding mechanism for graphite electrode plates according to claim 2, wherein the lower mold (5) is provided with a second piston portion (52) provided to protrude from the lower mold (5) body, the demolding drive member (7) is provided with a second housing portion (71) housing the second piston portion (52), and the demolding drive member (7) is provided so that the second piston portion (52) reciprocates in the second housing portion (71).

6. The forming and demolding mechanism for graphite electrode plates, according to claim 4, characterized in that the lower platform (3) is provided with a first piston portion (33) protruding from the other side of the lower platform (3) body, the forming drive member (11) is provided with a first housing portion (12) housing the first piston portion (33), and the forming drive member (11) is provided so that the first piston portion (33) reciprocates within the first housing portion (12).

7. The forming and demoulding mechanism for graphite pole plates according to claim 1, characterized in that the upper mould (4) is provided with a groove (41) for accommodating the positioning projection (32).

8. The forming and demolding mechanism for graphite electrode plates, as claimed in claim 1, wherein the lower mold (5) is provided with air blow holes (51) for blowing air to the upper surface of the lower mold (5).

9. The forming and demolding mechanism for graphite electrode plates, according to claim 1, further comprising an upper pressing plate (2), wherein the upper mold (4) is arranged on the upper pressing plate (2).

10. A molding and demolding method for a graphite electrode plate, characterized in that the molding and demolding method uses the molding and demolding mechanism according to claims 1 to 9, and the molding and demolding method comprises:

placing a graphite raw material on the lower die (5) and positioning the graphite raw material through a positioning bulge (32) on the lower platform (3);

the lower platform (3) drives the lower die (5) to move upwards so as to carry out die pressing and pressing with the upper die (4);

after the mould pressing and laminating, the lower platform (3) moves downwards, and the lower mould (5) is separated from the upper mould (4); and

moving the lower mold (5) in an upward direction to raise the lower mold (5) to be at least flush with the positioning protrusion (32).