Valve plastic part injection mold structure

Abstract

The utility model provides a valve plastic part injection mold structure which comprises an upper mold body, a lower mold body and a mold top plate, a pouring gate disc is embedded in the middle of the top end of the mold top plate, a pouring gate position is formed in the center of the pouring gate disc, a hot runner is arranged at the bottom end of the pouring gate position, and an annular electric heating stone is installed at the bottom end of the hot runner. A power receiving coil is arranged on the side portion of the annular electric heating stone, a power transmitting coil is installed on the side portion of the upper die body, and the power transmitting coil is connected with the power receiving coil so that the heating end face of the annular electric heating stone can generate heat. According to the utility model, the power transmitting coil is arranged at the side part of the upper mold body and is connected with the power receiving coil, so that the heating end surface of the annular electric heating stone generates heat, and the heat can be generated to heat the hot runner, so that the temperature of the hot runner is higher; the phenomena of flow velocity reduction and adhesion are avoided, and the pouring quality is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology and relates to an injection mold structure for valve plastic parts. Background Technology

[0002] Plastic valves are valves made of plastic materials, characterized by corrosion resistance, high temperature resistance, lightweight, and easy installation. Because the valve material is plastic, injection molding is typically used for production. For example, patent application CN202310628474.X discloses an injection molding mold for a plastic valve handle. A cavity is provided on the end face of the fixed mold near the sliding mold, with multiple molding cavities on the cavity end face. A punch is provided on one side of the cavity on the end face of the sliding mold near the fixed mold, with multiple pressing plates on the punch end face. An injection port is connected to the end face of the pressing plates on one side of the pressing plates, and a first flow inner tube is connected to the punch on the side of the injection port. Multiple second flow inner tubes are provided on both sides of the first flow inner tube within the punch. Multiple injection ports connected to the second flow inner tubes are provided on the end face of the pressing plates. This design allows for vibration treatment of the handle end and the rotating end during demolding of the plastic valve handle, and also provides cooling treatment for the finished product.

[0003] The aforementioned injection mold has the following drawbacks: as the hot-melt plastic enters the lower-temperature gate area, a decrease in flow rate and adhesion occur, affecting the casting quality. Therefore, we have designed an injection mold structure for valve plastic parts. Summary of the Invention

[0004] The purpose of this utility model is to provide a structure for injection molds of valve plastic parts to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved through the following technical solution: A valve plastic injection mold structure includes an upper mold body, a lower mold body, and a mold top plate. The upper mold body and the lower mold body are connected by a mold assembly, and the mold top plate is bolted to the top of the upper mold body. The upper mold body has a molding cavity that matches the mold cavity of the lower mold body. A sprue plate is embedded in the middle of the top of the mold top plate. A sprue position is opened at the center of the sprue plate. A hot runner is provided at the bottom of the sprue position. An annular heating stone is installed at the bottom of the hot runner. A power receiving coil is provided on the side of the annular heating stone. A power transmitting coil is installed on the side of the upper mold body. The power transmitting coil is connected to the power receiving coil, causing the heating end face of the annular heating stone to generate heat.

[0006] In the above-mentioned valve plastic injection mold structure, the upper mold is further provided with cooling channels distributed around the molding cavity, and the two ends of the cooling channels are respectively equipped with a water inlet double connector and a water outlet double connector.

[0007] In the above-mentioned injection mold structure for valve plastic parts, the upper mold body has multiple positioning recesses at the bottom edge and the lower mold body has multiple limiting protrusions at the top edge, with each limiting protrusion corresponding to a positioning recess.

[0008] In the above-mentioned injection mold structure for valve plastic parts, a connecting rod is installed on the side of the top of the sprue plate, and the tail end of the connecting rod protrudes from the side edge of the mold top plate.

[0009] In the above-mentioned valve plastic injection mold structure, the tail end of the connecting rod is provided with a rotary connector, and the top end of the rotary connector is equipped with a telescopic cylinder.

[0010] In the above-mentioned valve plastic injection mold structure, the heating end face of the annular electrothermal stone is attached to the outer wall of the hot runner, and the annular electrothermal stone is connected to the upper mold body through a sealing structure.

[0011] Compared with the prior art, the advantages of the valve plastic injection mold structure of this utility model are as follows: By installing an annular electrothermal stone at the bottom of the hot runner, and setting a power receiving coil on the side of the annular electrothermal stone, and installing a power transmitting coil on the side of the upper mold body, the power transmitting coil is connected to the power receiving coil, and the heating end face of the annular electrothermal stone generates heat. This heat generates heat to heat the hot runner, making the temperature of the hot runner part higher, avoiding the reduction of flow rate and adhesion, and ensuring the casting quality. At the same time, a connecting rod is installed on the side of the top of the sprue plate. The tail end of the connecting rod protrudes from the side edge of the mold top plate and is connected to a telescopic cylinder through a rotating connector, which has a good effect on removing the sprue plate. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of a valve plastic part injection mold structure according to the present invention.

[0013] Figure 2 This is a three-dimensional structural diagram of the gate plate of a valve plastic injection mold according to the present invention.

[0014] Figure 3 This is a schematic diagram of the internal structure of the upper mold of a valve plastic injection mold according to the present invention.

[0015] In the diagram, 1. Upper mold body; 2. Lower mold body; 3. Mold top plate; 4. Sprue plate; 5. Sprue position; 6. Connecting rod; 7. Positioning recess; 8. Limiting protrusion; 9. Telescopic cylinder; 10. Rotary connector; 11. Hot runner; 12. Annular heating stone; 13. Power receiving coil; 14. Power transmitting coil; 15. Molding cavity; 16. Cooling runner; 17. Water inlet double connector; 18. Water outlet double connector. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a valve plastic part injection mold structure;

[0018] Example 1: The injection mold includes an upper mold body 1, a lower mold body 2, and a mold top plate 3. The upper mold body 1 and the lower mold body 2 are connected by a mold closing mechanism, and the mold top plate 3 is installed on the top of the upper mold body 1 by bolts. The upper mold body 1 has a molding cavity 15 that matches the mold cavity of the lower mold body 2. A sprue plate 4 is embedded in the middle of the top of the mold top plate 3. A sprue position 5 is opened at the center of the sprue plate 4. A hot runner 11 is provided at the bottom of the sprue position 5. An annular heating stone 12 is installed at the bottom of the hot runner 11. A power receiving coil 13 is provided on the side of the annular heating stone 12. A power transmitting coil 14 is installed on the side of the upper mold body 1. The power transmitting coil 14 is connected to the power receiving coil 13, so that the heating end face of the annular heating stone 12 generates heat.

[0019] In order to ensure good heating and heat conduction, the heating end face of the annular electric heating stone 12 is attached to the outer wall of the heat flow channel 11, and the annular electric heating stone 12 is connected to the upper mold body 1 through a sealing structure.

[0020] Furthermore, a connecting rod 6 is installed on the side of the top of the sprue plate 4, with the tail end of the connecting rod 6 protruding from the side edge of the mold top plate 3; a rotary connector 10 is provided at the tail end of the connecting rod 6, and a telescopic cylinder 9 is installed at the top of the rotary connector 10. This arrangement provides a good effect for removing the sprue plate.

[0021] The design of Embodiment 1 can generate heat to heat the hot runner 11, resulting in a higher temperature in the hot runner 11, avoiding a decrease in flow rate and adhesion, and ensuring the casting quality.

[0022] Example 2: The injection mold includes an upper mold body 1, a lower mold body 2, and a mold top plate 3. The upper mold body 1 and the lower mold body 2 are connected by mold closing, and the mold top plate 3 is installed on the top of the upper mold body 1 by bolts. The upper mold body 1 has a molding cavity 15 that matches the mold cavity of the lower mold body 2. A sprue plate 4 is embedded in the middle of the top of the mold top plate 3. A sprue position 5 is opened at the center of the sprue plate 4. A hot runner 11 is provided at the bottom of the sprue position 5. The hot runner 11 corresponds to the molding cavity 15. Cooling channels 16 are also provided inside the upper mold body 1, which are distributed around the molding cavity 15. A water inlet double connector 17 and a water outlet double connector 18 are respectively installed at both ends of the cooling channels 16.

[0023] This design features excellent water cooling, facilitating rapid cooling and molding.

[0024] Furthermore, in the scheme of Embodiment 1, in order to ensure high precision and firm connection between the upper mold body 1 and the lower mold body 2, multiple positioning recesses 7 are provided at the bottom edge of the upper mold body 1, and multiple limiting protrusions 8 are provided at the top edge of the lower mold body 2, with each limiting protrusion 8 corresponding to each positioning recess 7.

[0025] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A valve plastic injection mold structure, comprising an upper mold body (1), a lower mold body (2), and a mold top plate (3), characterized in that, The upper mold body (1) and the lower mold body (2) are connected by mold closing, and the mold top plate (3) is installed on the top of the upper mold body (1) by bolts. The upper mold body (1) is provided with a molding cavity (15) that matches the mold cavity of the lower mold body (2). A sprue plate (4) is embedded in the middle of the top of the mold top plate (3). A sprue position (5) is opened at the center of the sprue plate (4). A hot runner (11) is provided at the bottom of the sprue position (5). An annular electric heating stone (12) is installed at the bottom of the hot runner (11). A power receiving coil (13) is provided on the side of the annular electric heating stone (12). A power transmitting coil (14) is installed on the side of the upper mold body (1). The power transmitting coil (14) is connected to the power receiving coil (13) and causes the heating end face of the annular electric heating stone (12) to generate heat.

2. The valve plastic part injection mold structure according to claim 1, characterized in that, The upper mold body (1) is also provided with cooling channels (16) distributed around the molding cavity (15), and the two ends of the cooling channels (16) are respectively equipped with water inlet double connector (17) and water outlet double connector (18).

3. The injection mold structure for a valve plastic part according to claim 1, characterized in that, The upper mold body (1) has multiple positioning recesses (7) at its bottom edge, and the lower mold body (2) has multiple limiting protrusions (8) at its top edge, with each limiting protrusion (8) corresponding to each positioning recess (7).

4. The valve plastic part injection mold structure according to claim 1, characterized in that, A connecting rod (6) is installed on the side of the top of the sprue plate (4), and the tail end of the connecting rod (6) protrudes from the side edge of the mold top plate (3).

5. The valve plastic part injection mold structure according to claim 4, characterized in that, The tail end of the connecting rod (6) is provided with a rotary connector (10), and the top end of the rotary connector (10) is equipped with a telescopic cylinder (9).

6. The injection mold structure for a valve plastic part according to claim 1, characterized in that, The heating end face of the annular electric heating stone (12) is attached to the outer wall of the hot runner (11), and the annular electric heating stone (12) is connected to the upper mold body (1) through a sealing structure.

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