High-pressure RTM (Resin Transfer Molding) mold for upper cover of battery box

Abstract

The utility model relates to the technical field of high-pressure RTM (Resin Transfer Molding) molds, in particular to a high-pressure RTM mold for an upper cover of a battery box. The device comprises an upper mold plate and a lower mold plate, a mold cavity is defined between the upper mold plate and the lower mold plate, and the mold cavity is communicated with a core pulling mechanism. The core pulling mechanism comprises an air pipe communicated with the mold cavity, a hydraulic piston rod used for blocking the air pipe, a branch pipe fixedly connected with the pipe wall of the air pipe, a main pipe communicated with the branch pipe, an air collecting block fixedly connected with the main pipe, and a first switch valve and a second switch valve which are connected to the air collecting block. The device can blow air into the mold cavity and vacuumize the mold cavity, and vacuumizing can eliminate the influence of air on molding, so that the phenomenon of poor exhaust is fundamentally solved; the vacuum cavity is easy to fill, and injection molding pressure and injection molding machine back pressure are reduced; the injection speed can be increased, the molding period is shortened, and the production efficiency is improved; air is blown into the mold cavity to open the mold, the vacuum degree between a finished product and the mold plate is destroyed, and product demolding is facilitated; the device can be electrically connected with a controller, and the automation degree is high.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage RTM molds, in particular to a high-voltage RTM mold for a battery box upper cover. Background Art

[0002] With the development of electric vehicles, the demand for batteries is increasing. As a part of the battery pack box, the battery box cover plays a sealing and protective role. Therefore, the mold structure precision requirements for the production of battery box covers are getting higher and higher, the mold structure design is becoming more and more complex, and the cost is also greatly increased accordingly. Therefore, simplifying the mold structure and reducing the mold cost are urgent problems that need to be solved.

[0003] Chinese patent application number CN202322379593.4 discloses "A PCM HP-RTM mold vacuum degassing device", publication number CN220638972U, the device includes a mold cavity and a mold core, a degassing space is provided in the middle of the mold cavity, a degassing needle is slidably provided in the degassing space, a degassing sleeve is provided between the degassing space and the degassing needle, one side of the degassing sleeve is connected to the mold gas path, and the external high-pressure gas connected to the mold gas path adopts a normally open mode. However, the device has some defects: after the demolding is completed, air still remains in the mold cavity. When injecting into the mold cavity, the remaining air will affect the injection molding effect and the quality of the finished product. Utility Model Content

[0004] In order to solve the above problems of the prior art, the utility model provides a high-pressure RTM mold for a battery box upper cover, which can blow air and evacuate the mold cavity, thereby assisting demoulding and eliminating the influence of air on mold forming.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-pressure RTM mold for a battery box cover, comprising an upper mold plate and a lower mold plate, wherein the upper mold plate and the lower mold plate together form a mold cavity, wherein the mold cavity is connected to a core-pulling mechanism, wherein the core-pulling mechanism comprises an air pipe connected to the mold cavity, a hydraulic piston rod for sealing the air pipe, a branch pipe fixedly connected to the wall of the air pipe, a main pipe connected to the branch pipe, an air collecting block fixedly connected to the main pipe, and a first switch valve and a second switch valve connected to the air collecting block.

[0006] With the above structural design, the first switch valve is connected to the vacuum pump, and the second switch valve is connected to the air pump. When production starts and the upper and lower molds are closed, the first switch valve is opened to evacuate the mold cavity. After the vacuuming is completed, the first switch valve is closed, and the hydraulic piston rod is operated to completely block the air pipe, and the steps of injection molding are carried out to prevent plastic from entering the air pipe, and the vacuum degree in the mold cavity can be maintained, and the influence of air on molding can be eliminated, which fundamentally solves the problem of poor exhaust. In addition, the vacuum cavity of the mold is easy to fill, reducing the injection pressure and the back pressure of the injection molding machine; it can also speed up the injection speed, reduce the molding cycle, and improve production efficiency. After the product is cured, before the press opens the mold, the hydraulic piston rod operates to release the state of air pipe blockage, and the second switch valve opens to start blowing air into the mold cavity to open the mold, destroying the vacuum degree between the finished product and the template, which is convenient for product demolding.

[0007] Preferably, core pulling mechanisms are provided on both the upper template and the lower template, and air pipes are passed through both the upper template and the lower template.

[0008] With the above structural design, before the press opens the mold, the hydraulic piston rod operates to release the air pipe from the blocked state, the second switch valve located on the upper mold plate opens first, and starts to blow air into the mold cavity to open the mold, thereby destroying the vacuum between the finished product and the upper mold plate, facilitating the demolding of the product from the upper mold plate, the second switch valve located on the upper mold plate closes, and then the second switch valve of the lower mold plate opens, thereby destroying the vacuum between the finished product and the lower mold plate, facilitating the demolding of the product from the lower mold plate.

[0009] Preferably, a plurality of support legs are fixedly connected to the upper template and the lower template, a support plate is fixedly connected to the support legs, and internal threaded holes are provided on the support legs and the support plate.

[0010] The above structural design makes it easy to connect the device to the press.

[0011] Preferably, a sealing rubber is fixedly connected to the inner wall of the trachea.

[0012] The above structural design can further improve the sealing performance after the trachea is blocked.

[0013] Preferably, the first switch valve and the second switch valve are both solenoid valves.

[0014] By adopting the above structural design, the first switch valve and the second switch valve are electrically connected to the controller, and the first switch valve and the second switch valve are started and closed at a fixed time, thereby improving the automation degree of the device.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1) This device can blow air and vacuum into the mold cavity. Vacuuming can eliminate the influence of air on molding and fundamentally solve the problem of poor exhaust. In addition, the vacuum cavity of the mold is easy to fill, reducing the injection pressure and the back pressure of the injection molding machine. It can also speed up the injection speed, reduce the molding cycle, and improve production efficiency. Blowing air into the mold cavity to open the mold destroys the vacuum between the finished product and the template, making it easier to demold the product.

[0017] 2) The device can be electrically connected to the controller, and has a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model from the front;

[0019] Figure 2 It is a schematic diagram of the structure of the utility model from the left;

[0020] Figure 3 It is a structural schematic diagram of the core-pulling structure of the utility model; DETAILED DESCRIPTION

[0021] See also Figure 1 , Figure 2 , Figure 3 The utility model provides a technical solution: a high-pressure RTM mold for a battery box cover, comprising an upper template 1 and a lower template 2, wherein a mold cavity 3 is enclosed between the upper template 1 and the lower template 2, and the mold cavity 3 is connected to a core-pulling mechanism, wherein the core-pulling mechanism comprises an air pipe 41 connected to the mold cavity 3, a hydraulic piston rod 4 for blocking the air pipe 41, a branch pipe 42 fixedly connected to the wall of the air pipe 41, a main pipe 43 connected to the branch pipe 42, an air collecting block 44 fixedly connected to the main pipe 43, a first switch valve 45 and a second switch valve 46 connected to the air collecting block 44, the first switch valve 45 is connected to a vacuum pump, and the second switch valve 44 is connected to an air pump.

[0022] The upper template 1 and the lower template 2 are both provided with core pulling mechanisms, and the upper template 1 and the lower template 2 are both provided with air pipes 41. Since the upper cover area of ​​the battery box is relatively large, in order to improve efficiency, the air pipes 41 in the core pulling structure, the hydraulic piston rods 4 for blocking the air pipes 41, and the branch pipes 42 are all provided in multiple groups, and the branch pipes 42 are connected to the main pipes 43 through pipe connectors 49. The branch pipes 42 located on the upper template are buried in the upper template 1, and the branch pipes located on the lower template 2 are buried in the lower template 2.

[0023] A plurality of support legs 51 are fixedly connected to the upper template 1 and the lower template 2 , and a support plate 52 is fixedly connected to the support legs 51 . Internal threaded holes are provided on the support legs 51 and the support plate 52 .

[0024] The inner wall of the air pipe 41 is fixedly connected with a sealing rubber.

[0025] The first switch valve 45 and the second switch valve 46 are both solenoid valves. The first switch valve 45, the second switch valve 46 and the hydraulic piston rod 4 are electrically connected to the controller, and the controller periodically sends electrical signals to the first switch valve 45, the second switch valve 46 and the hydraulic piston rod 4 to control the operation of the first switch valve 45, the second switch valve 46 and the hydraulic piston rod 4.

[0026] When the device is in use, at the beginning of production, after the upper mold plate 1 and the lower mold plate 2 are molded together, the hydraulic piston rod located at the lower mold plate 2 blocks the air pipe, and the hydraulic piston rod 4 located at the upper mold plate 1 does not block the air pipe. The first switch valve 45 located at the upper mold plate 1 is opened to evacuate the mold cavity. After the vacuuming is completed, the first switch valve 45 located at the upper mold plate 1 is closed, and the hydraulic piston rod 4 operates to completely block the air pipe 41, and the steps of injection molding are performed to prevent plastic from entering the air pipe, and the vacuum degree in the mold cavity can be maintained. Maintaining the vacuum degree in the mold cavity can eliminate the influence of air on molding, and fundamentally solve the problem of poor exhaust; the vacuum cavity of the mold is easy to fill, reducing the injection pressure and the back pressure of the injection molding machine; it can also speed up the injection speed, reduce the molding cycle, and improve production efficiency.

[0027] After the product is cured and before the press opens the mold, the hydraulic piston rod 4 located on the upper mold plate 1 operates to release the blocked state of the air pipe 41, and the second switch valve 46 located on the upper mold plate 1 opens, and starts to blow air into the mold cavity to open the mold, thereby destroying the vacuum between the finished product and the upper mold plate 1, making it easier for the product to be separated from the upper mold plate 1, and the second switch valve 46 located on the upper mold plate 1 closes, and then the hydraulic piston rod 4 of the lower mold plate 2 does not block the air pipe, and the second switch valve of the lower mold plate 2 opens, thereby destroying the vacuum between the finished product and the lower mold plate 2, making it easier for the product to be demolded from the lower mold plate 2.

[0028] Repeat the above steps to produce the battery box cover.

[0029] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0030] The present invention is described above with reference to the preferred embodiments, but the protection scope of the present invention is not limited thereto, and all technical solutions falling within the scope of the claims are within the protection scope of the present invention. Various improvements may be made to the present invention and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A high-voltage RTM mold for a battery box upper cover, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that: The upper mold plate (1) and the lower mold plate (2) are combined to form a mold cavity (3), and the mold cavity (3) is connected to a core-pulling mechanism, which comprises an air pipe (41) connected to the mold cavity (3), a hydraulic piston rod (4) for sealing the air pipe (41), a branch pipe (42) fixedly connected to the wall of the air pipe (41), a main pipe (43) connected to the branch pipe (42), an air collecting block (44) fixedly connected to the main pipe (43), a first switch valve (45) and a second switch valve (46) connected to the air collecting block (44).

2. A high-voltage RTM mold for a battery box upper cover according to claim 1, characterized in that: The upper mold plate (1) and the lower mold plate (2) are both provided with core-pulling mechanisms, and the upper mold plate (1) and the lower mold plate (2) are both provided with air pipes (41).

3. A high-voltage RTM mold for a battery box upper cover according to claim 1 or 2, characterized in that: A plurality of support legs (51) are fixedly connected to the upper template (1) and the lower template (2), a support plate (52) is fixedly connected to the support legs (51), and internal threaded holes are provided on the support legs (51) and the support plate (52).

4. A high-voltage RTM mold for a battery box upper cover according to claim 1 or 2, characterized in that: The inner wall of the air pipe (41) is fixedly connected with a sealing rubber.

5. The high-voltage RTM mold for a battery box upper cover according to claim 1, characterized in that: The first switch valve (45) and the second switch valve (46) are both solenoid valves.

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