Commutator injection mold

Abstract

The utility model discloses a commutator injection mold, including a push plate, a heating plate, a plunger and a material chamber, a plurality of injection ports are arranged at the bottom of the material chamber, the plunger is arranged above the material chamber and fixedly connected to the heating plate, the heating plate is fixed at the bottom of the push plate, the push plate is arranged to move up and down and is pushed by a press cylinder, during injection molding, the press cylinder pushes the plunger downward to send the melted plastic in the material chamber through the injection port, and is characterized in that: a plurality of ejector rods that can extend into the injection port are fixedly arranged at the bottom of the plunger, the plurality of ejector rods correspond to the plurality of injection ports one by one, and the lower ends of some or all of the ejector rods are connected to barbs. The utility model is used for injection molding in the manufacturing process of the commutator, simplifies the operation process, improves efficiency, and reduces the production cost of the commutator.

Description

Technical Field

[0001] The utility model relates to the technical field of commutator production and manufacturing, in particular to a commutator injection mold used in an injection molding process in the commutator manufacturing process. Background Art

[0002] There is an important process in the commutator manufacturing process called the commutator injection molding process. The commutator injection molding process is to inject the melted plastic through the commutator injection mold to complete the combination of the commutator copper sheet and plastic (usually bakelite powder). The existing commutator injection mold comprises a push plate, a heating plate, a plunger and a material chamber. A plurality of injection ports are arranged at the bottom of the material chamber. The plunger is arranged above the material chamber and fixedly connected to the heating plate. The heating plate is fixed to the bottom of the push plate. The push plate is arranged to move up and down and is pushed by the press cylinder. During the injection molding, the press cylinder pushes the plunger downward to send the molten plastic in the material chamber through the injection port. The disadvantage is that after the plunger sends the molten plastic in the material chamber through the injection port, when the plunger returns to its position, the residual plastic waste at the bottom of the inner cavity of the material chamber and in the injection port cannot be taken out in time. The commutator injection mold needs to be moved to a new station, and the plastic waste can be taken out by using the ejector action of another material chamber waste removal mold. There are many operation procedures and low production efficiency. In addition, a lot of plastic waste remains in the injection port, which wastes materials and increases the production cost of the commutator. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a commutator injection mold for injection molding in the commutator manufacturing process, which simplifies the operating procedures, improves efficiency, and reduces the production cost of the commutator.

[0004] The utility model is implemented through the following technical solutions:

[0005] The commutator injection mold comprises a push plate, a heating plate, a plunger and a material chamber. A plurality of injection ports are arranged at the bottom of the material chamber. The plunger is arranged above the material chamber and fixedly connected to the heating plate. The heating plate is fixed to the bottom of the push plate. The push plate is arranged to move up and down and is pushed by a press cylinder. During injection molding, the press cylinder pushes the plunger downward to send the molten plastic in the material chamber out through the injection port. The mold is characterized in that: a plurality of ejector rods capable of extending into the injection port are fixedly arranged at the bottom of the plunger, the plurality of ejector rods correspond one-to-one to the plurality of injection ports, and the lower ends of some or all of the ejector rods are connected to barbs.

[0006] The injection port has a tapered hole design, and the ejector pin has a tapered rod design.

[0007] The barb has a ball head shape.

[0008] After adopting the above technical scheme, after the plunger sends the molten plastic in the material chamber out through the injection port, when the plunger returns, the barb at the lower end of the ejector rod can hook the plastic waste remaining in the injection port when the plunger returns upward with the plunger, and automatically pull out the plastic waste together with the plastic waste at the bottom of the inner cavity of the material chamber from the inner cavity of the material chamber and the injection port. In this way, the commutator injection mold does not need to move the workstation and then use the ejector action of another material chamber waste removal mold to eject the plastic waste, thereby reducing the operation process and improving production efficiency. In addition, when the injection mold is closed, the ejector rod can enter the injection port and occupy part of the space in the injection port, thereby reducing the generation of plastic waste, saving materials, and reducing the production cost of the commutator. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model has the following drawings:

[0010] Figure 1 This is a schematic diagram of the structure of the utility model (mold closed state),

[0011] Figure 2 This is a schematic diagram of the structure of the utility model (mold disengaged state),

[0012] Figure 3 This is a diagram of the plastic waste generated after each injection molding operation.

[0013] Figure 4 It is a structural schematic diagram of the upper part of the utility model. DETAILED DESCRIPTION

[0014] As shown in the figure, the commutator injection mold of the utility model includes a push plate 1, a heating plate 2, a plunger 3 and a material chamber 4. The material chamber 4 has an inner cavity 41 of the material chamber. A plurality of injection ports 8 (only one is shown in the figure) are arranged at the bottom of the material chamber 4. The plunger 3 is arranged above the material chamber 4 and fixedly connected to the heating plate 2. The heating plate 2 is fixed to the bottom of the push plate 1. The push plate 1 is arranged to move up and down and is pushed by the press cylinder. During the injection molding, the press cylinder pushes the plunger 3 downward to send the molten plastic in the material chamber 4 out through the injection port 8. A plurality of ejector rods 9 that can extend into the injection port 8 are fixedly arranged at the bottom of the plunger 3. The plurality of ejector rods 9 correspond one-to-one to the plurality of injection ports 8. The lower end of each ejector rod 9 is connected to a ball-shaped barb 10. The injection port 8 has a tapered hole design, and the ejector rod 9 has a tapered rod design.

[0015] The utility model works as follows: at the injection molding station, the material chamber 4 and the mold barrel 6 are closed with the lower mold plate 7 through the guidance of the lower guide pin 5 and are placed flat on the press workbench, plastic is added to the material chamber cavity 41 of the material chamber 4, and then the press cylinder moves to push the plunger 3 into the material chamber 4 and heat the material chamber 4, and the heated molten plastic in the material chamber cavity 41 is injected into the mold barrel 6 through the injection port 8 and combined with the commutator copper sheet in the mold barrel 6 to form a commutator product A; when the plunger 3 returns, the barb 10 at the lower end of the ejector 9 returns upward with the plunger 3, and the barb 10 will hook the plastic waste remaining in the injection port 8 (the plastic waste has cooled at this time), and automatically pull it out from the material chamber cavity 41 and the injection port 8 together with the plastic waste at the bottom of the material chamber cavity 41 (see Figure 2 ), the shape of waste B is shown in Figure 3 As shown, it reduces the operation process and improves production efficiency; in addition, when the injection mold is closed (see Figure 1 ), it can be seen that the ejector rod 9 will enter the injection port 8 to occupy part of the space inside the injection port 8, thereby reducing the generation of plastic waste, saving materials, and reducing the production cost of the commutator.

Claims

1. A commutator injection mold, comprising a push plate, a heating plate, a plunger and a material chamber. A plurality of injection ports are provided at the bottom of the material chamber. The plunger is arranged above the material chamber and fixedly connected to the heating plate. The heating plate is fixed at the bottom of the push plate. The push plate is arranged to move up and down and is pushed by the press cylinder. During the injection molding operation, the press cylinder pushes the plunger downward to send the melted plastic in the material chamber out through the injection port. The characteristics are: A plurality of ejector rods capable of extending into the injection port are fixedly provided at the bottom of the plunger, the plurality of ejector rods correspond to the plurality of injection ports one by one, and the lower ends of some or all of the ejector rods are connected to the barbs.

2. The commutator injection mold according to claim 1, characterized in that: The injection port has a tapered hole design, and the ejector pin has a tapered rod design.

3. The commutator injection mold according to claim 1 or 2, characterized in that: The barb has a ball head shape.

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