Adjustable sealing needle assembly of needle valve type hot runner mold and mold

Abstract

The utility model relates to an adjustable sealing needle assembly of a needle valve type hot runner mold, which comprises a sealing needle body, a sealing needle cap mounting sleeve and an end cover, the sealing needle cap mounting sleeve is used for mounting the sealing needle body, and a sealing needle cap of the sealing needle body is positioned in an axial concave hole of the sealing needle cap mounting sleeve. At least one hollow gasket and at least one solid gasket are further arranged in the axial concave hole, the solid gasket is arranged at the outer end of the sealing needle cap, and the inner wall of the end cover abuts against the solid gasket, namely the sum of the thicknesses of the solid gasket, the hollow gasket and the sealing needle cap ensures that the inner wall of the end cover abuts against the solid gasket after assembly. By adopting the structure, the position of the sealing needle cap in the axial concave hole, namely the position of the whole valve needle, can be adjusted by loosening the end cover of the sealing needle cap mounting sleeve, taking out the sealing needle body, adjusting the position of the hollow gasket or replacing hollow gaskets or solid gaskets with different thicknesses; and the position of the end part of the sealing needle body relative to the mold sprue is controlled, and the length of the molded product sprue is controlled.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to the technology of preform mold components, specifically an adjustable sealing pin component for a needle valve type hot runner mold and such mold. Background Technology

[0002] Currently, hot runner molds are widely used in the production and processing of products such as bottle preforms. In existing needle valve type hot runner molds, due to the relatively simple structure of the sealing pin and its assembly, the distance between the end of the sealing pin body and the gate of the bottle preform mold cavity is usually fixed. For some products with strict appearance requirements or products that require long gates, the improvement or adjustment effect cannot be achieved directly. It is often necessary to replace the sealing pin with one of different lengths, or even replace the mold or re-open the mold, which is costly. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide an adjustable sealing pin assembly for a needle valve type hot runner mold and such a mold, which can control the gate length without replacing the sealing pin and is easy to operate.

[0004] This utility model is achieved through the following technical solution:

[0005] An adjustable sealing pin assembly for a needle valve type hot runner mold includes a sealing pin body and a sealing pin cap mounting sleeve for mounting the sealing pin body. The sealing pin body has a "T"-shaped sealing pin cap. The sealing pin cap mounting sleeve is a composite shape of coaxial large and small cylinders. The center of the large cylinder has an axial recessed hole. The bottom surface of the axial recessed hole and the center of the small cylinder have shaft holes for the sealing pin body to pass through. The sealing pin cap of the sealing pin body is located in the axial recessed hole. At least one hollow gasket and at least one solid gasket are also provided in the axial recessed hole. The center hole of the hollow gasket is greater than or equal to the outer diameter of the sealing pin body and can allow the sealing pin body to pass through. The solid gasket is located at the outer end of the sealing pin cap. An end cap covering the axial recessed hole is also connected to the outer end face of the sealing pin cap mounting sleeve. The inner wall of the end cap abuts against the solid gasket. That is, the sum of the thicknesses of the solid gasket, the hollow gasket, and the sealing pin cap should ensure that the inner wall of the end cap abuts against the solid gasket after assembly.

[0006] The outer wall of the sealing needle cap mounting sleeve is provided with several sealing ring grooves.

[0007] This utility model also provides a needle valve type hot runner mold with an adjustable gate length including the above-mentioned adjustable sealing pin assembly. The needle valve type hot runner mold includes a sealing pin mounting plate, a hot runner plate, a transition plate, and a mold cavity mounting plate. The sealing pin mounting plate is provided with a stepped mounting part for accommodating the sealing pin cap mounting sleeve, and the stepped mounting part penetrates the sealing pin mounting plate so that the sealing pin body can pass through. The hot runner plate and the transition plate are assembled in close contact, and the transition plate is equipped with a nozzle seat and a nozzle that communicate with the hot runner in the hot runner plate. The end of the nozzle passes through the transition plate and is opposite to the preform mold cavity on the mold cavity mounting plate. The preform mold cavity is provided with a gate opposite to the nozzle. The end of the sealing pin body passes through the hot runner plate and the transition plate in sequence and is opposite to the gate along the axial direction of the nozzle seat and the nozzle.

[0008] With the above structure, the position of the sealing needle cap in the axial recess can be adjusted by loosening the end cap of the sealing needle cap mounting sleeve, taking out the sealing needle body, adjusting the position of the hollow gasket or replacing it with a hollow gasket or solid gasket of different thicknesses, thereby adjusting the position of the sealing needle cap in the axial recess, i.e. the position of the entire valve needle, and thus controlling the position of the end of the sealing needle body relative to the mold gate, thereby controlling the length of the gate of the product after molding. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the adjustable sealing needle assembly of this utility model;

[0010] Figure 2 This is a schematic diagram showing the adjustable position of the adjustable sealing needle assembly of this utility model;

[0011] Figure 3 , Figure 4 This is a schematic diagram of the structure of the needle valve type hot runner mold of this utility model. Detailed Implementation

[0012] The present invention will be further illustrated below with reference to specific examples and accompanying drawings.

[0013] like Figure 1 , Figure 2As shown, an adjustable sealing pin assembly for a needle valve type hot runner mold is disclosed. The sealing pin assembly 1 includes a sealing pin body 11 and a sealing pin cap mounting sleeve 12 for mounting the sealing pin body 11. The sealing pin body 11 has a "T"-shaped sealing pin cap 111. The sealing pin cap mounting sleeve 12 is generally in the shape of a coaxial cylindrical composite shape. An axial recess 121 is provided at the center of the larger cylinder. The bottom surface of the axial recess 121 and the center of the smaller cylinder are provided with shaft holes 122 for the sealing pin body 11 to pass through. The sealing pin cap 111 of the sealing pin body 11 is located in the axial recess 121, and at least one hollow pad is also provided in the axial recess 121. The device consists of a hollow pad 13 and at least one solid pad 14, with the central hole of the hollow pad 13 being greater than or equal to the outer diameter of the sealing needle body 11 and allowing the sealing needle body 11 to pass through. The solid pad 14 is disposed at the outer end of the sealing needle cap 111, and an end cap 15 with a sealing axial recess 121 is also connected to the outer end face of the sealing needle cap mounting sleeve 12. The inner wall of the end cap 15 abuts against the solid pad 14, that is, the sum of the thicknesses of the solid pad 14, the hollow pad 13, and the sealing needle cap 111 is slightly greater than the depth of the axial recess 121, so that the end cap 15 can fix the sealing needle in the axial recess 121 of the sealing needle cap mounting sleeve 12 without relative axial movement.

[0014] The outer wall of the sealing needle cap mounting sleeve 12 is provided with several sealing ring grooves 123 to install sealing rings and achieve a sealed connection with the sealing needle mounting plate 2.

[0015] For example Figure 3 , Figure 4 As shown, this utility model also provides a needle valve type hot runner mold with an adjustable gate length including the above-mentioned adjustable sealing pin assembly. The needle valve type hot runner mold includes a sealing pin mounting plate 2, a hot runner plate 3, a transition plate 4, and a mold cavity mounting plate 5. The sealing pin mounting plate 2 is provided with a stepped mounting part 21 for accommodating the sealing pin cap mounting sleeve 12, and the stepped mounting part 21 penetrates the sealing pin mounting plate 2 so that the sealing pin body 11 can pass through. The hot runner plate 3 and the transition plate 4 are assembled in close contact, and the transition plate 4 is equipped with a nozzle seat 41 and a nozzle 42 that communicate with the hot runner in the hot runner plate 3. The end of the nozzle 42 passes through the transition plate 4 and is opposite to the preform mold cavity 51 on the mold cavity mounting plate 5. The preform mold cavity 51 is provided with a gate 52 opposite to the nozzle 42. The end of the sealing pin body 11 passes through the hot runner plate 3 and the transition plate 4 in sequence and is opposite to the gate 52 along the axial direction of the nozzle seat 41 and the nozzle 42.

[0016] With the above structure, by loosening the end cap 15 of the sealing needle cap mounting sleeve 12, taking out the sealing needle body 11, adjusting the position of the hollow gasket 13, or replacing it with a hollow gasket 13 of different thickness or a solid gasket 14, the position of the sealing needle cap 111 in the axial concave hole 121, i.e. the position of the entire valve needle, can be adjusted. This allows control of the position of the end of the sealing needle body 11 relative to the mold gate 52, thereby controlling the length of the gate of the molded product.

[0017] For example, when the gate length needs to be increased, the end face of the sealing pin cap 111 needs to be closer to the end cap 15. In this case, the sealing pin body 11 can be removed first. A hollow gasket 13 can be added to the inside of the sealing pin cap 111, or a thicker hollow gasket 13 can be added. Correspondingly, a thinner solid gasket 14 can be added, or one solid gasket 14 can be removed. The specific thickness can be calculated. Conversely, when the gate length needs to be shortened, the end face of the sealing pin cap 111 needs to be farther from the end cap 15. In this case, the sealing pin body 11 can be removed first, and then the hollow gasket 13 inside the sealing pin cap 111 can be removed and placed between the solid gasket 14 and the end face of the sealing pin cap 111, thereby achieving the effect of the sealing pin end being closer to the gate.

[0018] The above embodiments are merely preferred embodiments of the present utility model and are only used to explain the present utility model, not to limit the present utility model. Any changes, substitutions, combinations, simplifications, modifications, etc., made by those skilled in the art without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. An adjustable sealing pin assembly for a needle valve type hot runner mold, characterized in that: The sealing needle assembly includes a sealing needle body and a sealing needle cap mounting sleeve for mounting the sealing needle body. The sealing needle body has a "T"-shaped sealing needle cap. The sealing needle cap mounting sleeve is a composite shape of coaxial cylinders of different sizes. The center of the larger cylinder has an axial recessed hole. The bottom surface of the axial recessed hole and the center of the smaller cylinder have axial holes for the sealing needle body to pass through. The sealing needle cap of the sealing needle body is located in the axial recessed hole. At least one hollow gasket and at least one solid gasket are also provided in the axial recessed hole. The center hole of the hollow gasket is greater than or equal to the outer diameter of the sealing needle body and can allow the sealing needle body to pass through. The solid gasket is located at the outer end of the sealing needle cap. An end cap that covers the axial recessed hole is also connected to the outer end face of the sealing needle cap mounting sleeve. The inner wall of the end cap abuts against the solid gasket. That is, the sum of the thicknesses of the solid gasket, the hollow gasket, and the sealing needle cap should ensure that the inner wall of the end cap abuts against the solid gasket after assembly.

2. The adjustable sealing pin assembly of the needle valve type hot runner mold according to claim 1, characterized in that: The outer wall of the sealing needle cap mounting sleeve is provided with several sealing ring grooves.

3. A needle valve type hot runner mold comprising an adjustable gate length of the adjustable sealing pin assembly as described in claim 1, characterized in that: The needle valve type hot runner mold includes a sealing pin mounting plate, a hot runner plate, a transition plate, and a mold cavity mounting plate. The sealing pin mounting plate is provided with a stepped mounting part to accommodate the sealing pin cap mounting sleeve, and the stepped mounting part passes through the sealing pin mounting plate to allow the sealing pin body to pass through. The hot runner plate and the transition plate are assembled in close contact, and the transition plate is equipped with a nozzle seat and a nozzle that communicate with the hot runner in the hot runner plate. The end of the nozzle passes through the transition plate and is opposite to the preform mold cavity on the mold cavity mounting plate. The preform mold cavity is provided with a gate opposite to the nozzle. The end of the sealing pin body passes through the hot runner plate and the transition plate in sequence and is opposite to the gate along the axial direction of the nozzle seat and the nozzle.

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