Transmission fluted disc injection mold

Abstract

The utility model relates to the technical field of injection molding machines, and discloses a transmission fluted disc injection mold, which comprises a movable mold and a fixed mold, the movable mold is provided with a first mold cavity, when the movable mold and the fixed mold are assembled, the first mold cavity and the fixed mold form an injection molding cavity, the fixed mold is provided with a second mold cavity, the second mold cavity is used for placing a cam shaft, and the cam shaft is arranged in the injection molding cavity. And at least two blocking pieces are arranged at the position, at the inlet of the second mold cavity, of the fixed mold, and when all the blocking pieces move towards the center line of the cam shaft, all the blocking pieces can block a gap between a shaft body of the cam shaft and an opening of the second mold cavity. The camshaft can solve the problems that in the prior art, a sealing piece is arranged on the shaft body in a sleeved mode to block the gap, after injection molding of the camshaft is completed, the sealing piece needs to be dismantled, and use is troublesome.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to an injection mold for a transmission gear disc. Background Art

[0002] The camshaft is a component of a piston engine, and its function is to control the opening and closing of the valve. The camshaft includes a shaft body and a transmission gear disc. Traditional camshafts are usually made of high-quality alloy steel or alloy steel, with high strength and support capacity. At present, the shaft body of some camshafts is made of high-quality alloy steel or alloy steel, and the transmission gear disc is injection molded on the shaft body, which can reduce the overall weight and reduce costs, and has lower noise during use. It is suitable for high-noise equipment such as lawn mowers and can effectively reduce noise during use.

[0003] At present, injection molding is mostly done by using an injection molding machine to make plastic products of various shapes from thermoplastics or thermosetting plastics using a plastic molding mold. For example, a more conventional horizontal injection molding machine in the prior art mainly includes a movable mold, a fixed mold and a push plate. When working, the shaft body is first placed in the mold cavity of the fixed mold, and then the movable mold and the fixed mold are closed, and the shaft body is fixed. The injection screw will melt the raw material in the barrel and transport it to the injection cavity of the transmission gear disc formed between the movable mold and the fixed mold. The molten raw material is solidified into a transmission gear disc after pressure maintenance and cooling.

[0004] Since the camshaft has multiple cams, the entrance size of the mold cavity needs to be designed to be large enough for the largest cam to pass through. After the shaft body is placed in the mold cavity of the fixed mold, there is a gap between the entrance of the mold cavity and the shaft body. During mold closing and injection molding, the raw material will enter the mold cavity. In the prior art, most of the gaps are blocked by installing a seal on the shaft body to prevent the raw material from entering the mold cavity during mold closing and injection molding. However, after the camshaft is injection molded, the seal needs to be removed, which is more troublesome to use. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a transmission gear plate injection mold to solve the problem in the prior art that a seal is sleeved on the shaft body to seal the gap, and after the camshaft is injection molded, the seal needs to be removed, which is troublesome to use.

[0006] The utility model solves the above technical problems through the following technical means:

[0007] A transmission gear plate injection mold comprises a movable mold and a fixed mold, wherein the movable mold is provided with a first mold cavity, and when the movable mold is combined with the fixed mold, the first mold cavity and the fixed mold form an injection cavity, and the fixed mold is provided with a second mold cavity, and the second mold cavity is used to place a camshaft, and the fixed mold is provided with at least two blocking pieces at the entrance of the second mold cavity, and when all the blocking pieces move toward the center line of the camshaft, all the blocking pieces can block the gap between the camshaft shaft body and the opening of the second mold cavity.

[0008] Furthermore, a guide groove is provided on the blocking member, and a guide member is provided on the fixed mold. The blocking member is slidably mounted on the guide member through the guide groove. When the blocking member approaches the fixed mold, the blocking member approaches the center line of the camshaft along the guide member to block the gap between the camshaft shaft body and the opening of the second mold cavity. When the blocking member moves away from the fixed mold, the blocking member moves away from the center line of the camshaft along the guide member to release the blockage of the gap between the camshaft shaft body and the opening of the second mold cavity.

[0009] Furthermore, the fixed mold includes a fixed plate and a movable part, the second mold cavity is arranged in the movable part, the movable part can move laterally relative to the fixed plate, the movable part is provided with sliding grooves at the upper and lower ends of the second mold cavity, the blocking part is slidably installed in the sliding groove, a through groove is arranged in the sliding groove, and the guide part passes through the through groove and is slidably arranged in the guide groove.

[0010] Furthermore, first installation grooves are provided on both sides of the slide groove away from the second mold cavity end, a limit block is fixedly installed in the first installation groove, and a limit groove is provided on the blocking member, and the limit block is clamped in the limit groove.

[0011] Furthermore, a second mounting groove is provided at one end of the slide groove close to the second mold cavity, a third mounting groove is provided on the blocking member, an elastic member is arranged in the second mounting groove, one end of the elastic member abuts against the bottom of the second mounting groove, and the other end abuts against the top of the third mounting groove.

[0012] Furthermore, an arc-shaped groove is provided at one end of the blocking member close to the second mold cavity, and a blocking block is installed in the arc-shaped groove.

[0013] Furthermore, an orientation block is disposed in the second mold cavity, and a timing protrusion is disposed in the first mold cavity. The orientation block is used to define a cam direction, and the cam direction defined by the orientation block is aligned with the timing protrusion.

[0014] Beneficial effects of the utility model:

[0015] 1. By setting the sealing piece, after the shaft body of the camshaft is placed in the second mold cavity, the two sealing pieces are controlled to move toward each other, so that the gap between the shaft body of the camshaft and the opening of the second mold cavity can be sealed. There is no need to install and disassemble the sealing piece, and the operation is simple and quick.

[0016] 2. The moving direction of the blocking piece is guided by setting the guide groove and the guide piece. When the mold is closed, the movable mold squeezes the blocking piece so that the blocking piece moves along the direction of the guide piece toward the second mold cavity, thereby blocking the gap between the camshaft shaft body and the opening of the second mold cavity. When the mold is opened, the movable mold drives the camshaft to move, and the camshaft pushes the blocking piece to move, and the blocking piece moves along the direction of the guide piece toward the direction away from the second mold cavity, thereby releasing the blockage of the gap between the camshaft shaft body and the opening of the second mold cavity, so that the camshaft can be detached from the second mold cavity without the need to set up an additional driving mechanism, thereby effectively reducing the cost.

[0017] 3. By setting a fixed plate and a movable part, the movable part can move relative to the fixed plate along the axial direction of the second mold cavity, and the blocking part is slidably installed in the slide groove. When the blocking part moves along the axial direction of the second mold cavity, it can drive the movable part to move synchronously along the axial direction of the second mold cavity, so that the blocking part can only move up and down relative to the second mold cavity, thereby avoiding changes in the blocking contact position between the blocking part and the camshaft shaft body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a transmission gear plate injection mold of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the fixed mold after the movable mold and the fixed mold in the transmission gear disk injection mold of the utility model are molded together;

[0020] Figure 3 It is a cross-sectional structural diagram of a fixed mold and a blocking piece in a transmission gear disk injection mold of the utility model;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of a fixed mold and a blocking piece in a transmission gear disk injection mold of the utility model;

[0022] in,

[0023] 1. Moving mold; 11. First mold cavity;

[0024] 2. Fixed mold; 21. Fixed plate; 211. Guide member; 22. Movable member; 221. Slide; 222. First mounting groove; 223. Limit block; 224. Through groove; 225. Second mounting groove; 23. Second mold cavity; 231. Orientation block;

[0025] 3. Blocking piece; 31. Limiting groove; 32. Guide groove; 33. Third mounting groove; 34. Arc groove; 341. Blocking block;

[0026] 4. Camshaft;

[0027] 5. Elastic parts. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the figures may be omitted.

[0029] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the figures, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] like Figure 1-Figure 4 As shown, a transmission gear disk injection mold of the utility model comprises a movable mold 1, a fixed mold 2 and a sealing member 3. A first mold cavity 11 is arranged on the movable mold 1. When the movable mold 1 and the fixed mold 2 are molded together, the first mold cavity 11 and the fixed mold 2 form an injection cavity. A second mold cavity 23 is arranged on the fixed mold 2. The second mold cavity 23 is used to place the camshaft 4. At least two sealing members 3 are arranged. In this embodiment, two sealing members 3 are arranged. The two sealing members 3 are symmetrically arranged at the entrance of the second mold cavity 23 up and down. When the two sealing members 3 move toward each other toward the center line of the camshaft 4, the two sealing members 3 can seal the gap between the shaft body of the camshaft 4 and the opening of the second mold cavity 23.

[0031] Specifically, the fixed mold 2 includes a fixed plate 21 and a movable member 22. The second mold cavity 23 is arranged in the movable member 22. The movable member 22 can move laterally relative to the fixed plate 21. The movable member 22 is provided with a slide groove 221 at both upper and lower ends of the second mold cavity 23. The blocking member 3 is slidably installed in the slide groove 221. In this embodiment, the slide groove 221 is provided with a first installation groove 222 on both sides away from the second mold cavity 23. The first installation groove 222 is fixedly installed with a limit block 223. The blocking member 3 is provided with a limit groove 31, and the limit block 223 is clamped in the limit groove 31. The moving direction of the blocking member 3 is limited by the limit block 223, so that the blocking member 3 is slidably installed in the slide groove 221, which can prevent the blocking member 3 from changing the blocking contact position with the camshaft 4 shaft body. The blocking member 3 is provided with a guide groove 32, the fixed plate 21 is provided with a guide member 211, the slide groove 221 is provided with a through groove 224, the guide member 211 passes through the through groove 224 and is slidably disposed in the guide groove 32, that is, the blocking member 3 is slidably sleeved on the guide member 211 through the guide groove 32. It should be noted that the side of the blocking member 3 close to the movable mold 1 and the side of the movable member 22 close to the movable mold 1 are located on the same plane, so that the movable mold 1 can be smoothly molded with the movable member 22 to ensure the sealing effect.

[0032] By setting the guide groove 32 and the guide member 211, the moving direction of the blocking member 3 is guided. When the mold is closed, the movable mold 1 squeezes the blocking member 3, so that the blocking member 3 approaches the second mold cavity 23 along the direction of the guide member 211, and blocks the gap between the camshaft 4 and the opening of the second mold cavity 23; when the mold is opened, the movable mold 1 drives the camshaft 4 to move, and the camshaft 4 pushes the blocking member 3 to move, and the blocking member 3 moves away from the second mold cavity 23 along the direction of the guide member 211, so as to release the blockage of the gap between the camshaft 4 and the opening of the second mold cavity 23, so that the camshaft 4 can be separated from the second mold cavity 23, without the need to set up an additional driving mechanism, thereby effectively reducing the cost.

[0033] In this embodiment, a second mounting groove 225 is provided at one end of the slide groove 221 close to the second mold cavity 23, a third mounting groove 33 is provided on the blocking member 3, an elastic member 5 is provided in the second mounting groove 225, one end of the elastic member 5 is abutted and connected with the bottom of the second mounting groove 225, and the other end is abutted and connected with the top of the third mounting groove 33. The elastic member 5 is a compression spring, which makes the blocking member 3 have a tendency to move away from the second mold cavity 23, and cooperates with the blocking member 3 and the guide member 211 to provide a thrust for the movable member 22 in the axial direction of the second mold cavity 23 away from the fixed plate 21, so that the movable member 22 can move outward more smoothly when the mold is opened.

[0034] In this embodiment, an arc groove 34 is provided at one end of the sealing member 3 close to the second mold cavity 23, and a sealing block 341 is installed in the arc groove 34. The sealing block 341 is configured to fit tightly with the contact surface of the camshaft 4 shaft body to ensure the sealing effect. The sealing block 341 can be fixedly installed in the arc groove 34 by screwing, welding, bonding, etc.

[0035] In this embodiment, an orientation block 231 is provided in the second mold cavity 23, and a timing protrusion is provided in the first mold cavity 11. The orientation block 231 limits the direction of the cam placed in the second mold cavity 23 so that the direction of the cam is aligned with the timing protrusion.

[0036] The working principle of the utility model is as follows:

[0037] First, the shaft body of the camshaft 4 is placed into the second mold cavity 23 until the shaft body abuts against the end wall of the second mold cavity 23 and the cam of the shaft body is stuck in the orientation block 231 .

[0038] Then, when the movable mold 1 is closed, the movable mold 1 squeezes the movable part 22, and the movable part 22 pushes the blocking part 3 to move, so that the blocking part 3 moves along the direction of the guide part 211 toward the second mold cavity 23, and the blocking block 341 of the blocking part 3 is pressed on the shaft body of the camshaft 4 to block the gap between the shaft body of the camshaft 4 and the opening of the second mold cavity 23;

[0039] After the injection molding is completed, when the mold is opened, the movable mold 1 drives the camshaft 4 to move, and the camshaft 4 pushes the blocking part 3 and the movable part 22 to move, so that the blocking part 3 moves along the direction of the guide part 211 away from the second mold cavity 23, thereby releasing the blockage of the gap between the camshaft 4 and the opening of the second mold cavity 23, so that the camshaft 4 can be separated from the second mold cavity 23.

[0040] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A transmission gear plate injection mold, comprising a movable mold and a fixed mold, wherein the movable mold is provided with a first mold cavity, and when the movable mold and the fixed mold are molded together, the first mold cavity and the fixed mold form an injection cavity, and the fixed mold is provided with a second mold cavity, and the second mold cavity is used to place a camshaft, characterized in that: The fixed mold is provided with at least two blocking pieces at the entrance of the second mold cavity. When all the blocking pieces move toward the center line of the camshaft, all the blocking pieces can block the gap between the camshaft shaft body and the opening of the second mold cavity.

2. The transmission gear plate injection mold according to claim 1, characterized in that: A guide groove is provided on the blocking member, and a guide member is provided on the fixed mold. The blocking member is slidably mounted on the guide member through the guide groove. When the blocking member approaches the fixed mold, the blocking member approaches the center line of the camshaft along the guide member to block the gap between the camshaft shaft body and the opening of the second mold cavity. When the blocking member moves away from the fixed mold, the blocking member moves away from the center line of the camshaft along the guide member to release the blockage of the gap between the camshaft shaft body and the opening of the second mold cavity.

3. The transmission gear plate injection mold according to claim 2, characterized in that: The fixed mold includes a fixed plate and a movable part. The second mold cavity is arranged in the movable part. The movable part can move laterally relative to the fixed plate. The movable part is provided with sliding grooves at the upper and lower ends of the second mold cavity. The blocking part is slidably installed in the sliding groove. A through groove is arranged in the sliding groove. The guide part passes through the through groove and is slidably arranged in the guide groove.

4. The transmission gear plate injection mold according to claim 3, characterized in that: The two sides of the slide groove away from the second mold cavity end are both provided with a first installation groove, a limit block is fixedly installed in the first installation groove, and a limit groove is provided on the blocking member, and the limit block is clamped in the limit groove.

5. The transmission gear plate injection mold according to claim 3, characterized in that: A second mounting groove is provided at one end of the slide groove close to the second mold cavity, a third mounting groove is provided on the blocking member, an elastic member is arranged in the second mounting groove, one end of the elastic member abuts against the bottom of the second mounting groove, and the other end abuts against the top of the third mounting groove.

6. A transmission gear plate injection mold according to any one of claims 1 to 5, characterized in that: An arc-shaped groove is arranged at one end of the blocking member close to the second mold cavity, and a blocking block is installed in the arc-shaped groove.

7. The transmission gear plate injection mold according to claim 6, characterized in that: An orientation block is arranged in the second mold cavity, and a timing protrusion is arranged in the first mold cavity. The orientation block is used to define a cam direction, and the cam direction defined by the orientation block is aligned with the timing protrusion.

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