Valve needle bushing and hot runner

Abstract

A valve needle bushing and a hot runner belong to the technical field of molds, a bushing rubber channel is arranged in the valve needle bushing along the axis, the bushing rubber channel extends to the bottom surface of the valve needle bushing, a bushing rubber inlet groove is formed in the outer wall of the valve needle bushing along the circumferential direction, and the bushing rubber inlet groove is communicated with the bushing rubber inlet groove. The lining glue inlet groove is provided with a lining glue inlet position and at least one lining glue inlet formed in the two sides of the lining glue inlet position respectively, the lining glue inlets are communicated with the lining glue channel respectively, the flowing speeds of molten materials surrounding the valve needle are equal, local shearing of the molten materials caused by the flowing speed difference is avoided, and the service life of the valve needle is prolonged. And the product quality is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and particularly relates to a valve needle bushing and a hot runner. Background Art

[0002] In the hot runner mold, it generally includes a valve needle (A), a valve needle bushing (B) and a manifold plate (C). The hot runner mold structure of the existing technology is as follows Figure 1 As shown, the valve needle bushing (B) is installed in the manifold plate (C), the bushing rubber inlet (B1) of the valve needle bushing (B) is connected to the manifold rubber channel (C1) of the manifold plate (C), and the valve needle (A) is set along the central axis of the valve needle bushing (B), and the valve needle (A) passes through the bushing rubber channel (B2) of the valve needle bushing (B). When the molten material flows from the diverter rubber channel (C1) of the diverter plate (C) and the bushing rubber inlet (B1) of the valve needle bushing (B) into the bushing rubber channel (B2) of the valve needle bushing (B), the molten material flows from the side close to the bushing rubber inlet (B1) to the opposite side away from the bushing rubber inlet (B1). Due to the presence of the valve needle (A), the valve needle (A) will block the flow of part of the molten material. The flow speed of the molten material blocked by the valve needle (A) is slower than the flow speed of the molten material not blocked by the valve needle (A), resulting in speed difference and stratification of the molten material on both sides of the valve needle (A). When the hot runner mold is injection molded, the molten material with a fast flow speed is easily sheared, causing obvious shear marks on the product, affecting the quality of the product. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a valve needle bushing and a hot runner.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A valve needle bushing, wherein a bushing rubber channel is provided inside the valve needle bushing along the axis, the bushing rubber channel extends to the bottom surface of the valve needle bushing, and a bushing rubber inlet groove is provided on the outer wall of the valve needle bushing along the circumferential direction, the bushing rubber inlet groove has a bushing rubber inlet position and at least one bushing rubber inlet is respectively provided on both sides of the bushing rubber inlet position, and the bushing rubber inlets are respectively communicated with the bushing rubber channel.

[0006] In the present invention, a valve needle transition hole is further provided inside the valve needle bushing along the axis. The valve needle transition hole is located above the bushing rubber channel, is communicated with the bushing rubber channel and extends to the top surface of the valve needle bushing.

[0007] In the present utility model, the valve needle bushing includes a connecting section, a first main section and a positioning section arranged in sequence from top to bottom along the axis, the bushing glue inlet groove is arranged on the outer wall of the first main section, the outer diameter of the positioning section is larger than the outer diameter of the first main section, and the part of the positioning section protruding from the first main section is provided with a first positioning portion.

[0008] In the present invention, the valve needle bushing includes a connecting positioning section and a second main body section arranged in sequence from top to bottom along the axis, the bushing glue inlet groove is arranged on the outer wall of the second main body section, the outer diameter of the connecting positioning section is larger than the outer diameter of the second main body section, and the part of the connecting positioning section protruding from the second main body section is provided with a second positioning portion.

[0009] In the present invention, the bushing glue feeding groove is provided with a bushing glue feeding port on both sides of the bushing glue feeding position, and the two bushing glue feeding ports are respectively arranged at 90° intervals from the bushing glue feeding position along the circumferential direction.

[0010] Based on the valve needle bushing provided above, the utility model also provides a hot runner, including a diverter plate, in which the diverter plate is provided with a plate body glue inlet, a plurality of diverter glue channels respectively connected to the plate body glue inlet, and a plurality of bushing mounting holes corresponding one to one to the plurality of diverter glue channels; a valve needle bushing as described above is installed in each of the bushing mounting holes, and after installation, the diverter glue channel corresponds to the bushing glue inlet position and is connected to the bushing glue inlet groove.

[0011] In the present invention, the structure of the valve needle bushing installed in the bushing mounting hole is as follows: it includes a connecting section, a first main section, and a positioning section arranged in sequence from top to bottom along the axis, the bushing glue feeding groove is provided on the outer wall of the first main section, the outer diameter of the positioning section is larger than the outer diameter of the first main section, and the portion of the positioning section protruding from the first main section is provided with a first positioning portion;

[0012] The bushing mounting hole passes through the top and bottom surfaces of the manifold plate; wherein the connecting section protrudes from the top surface of the manifold plate, the first main section is installed in the bushing mounting hole, and the positioning section abuts against the bottom surface of the manifold plate.

[0013] In the present invention, the bottom surface of the manifold plate is provided with a lower plate body positioning hole adapted to the first positioning portion, and the valve needle bushing is installed based on the cooperation of the positioning member, the first positioning portion and the lower plate body positioning hole.

[0014] In the present invention, the structure of the valve needle bushing installed in the bushing mounting hole is as follows: it includes a connecting positioning section and a second main body section arranged in sequence from top to bottom along the axis, the bushing glue feeding groove is provided on the outer wall of the second main body section, the outer diameter of the connecting positioning section is larger than the outer diameter of the second main body section, and the portion of the connecting positioning section protruding from the second main body section is provided with a second positioning portion;

[0015] The bushing mounting hole extends to the top surface of the manifold plate, wherein the connecting positioning section abuts the top surface of the manifold plate, and the second main body section is installed in the bushing mounting hole; the manifold plate is also provided with a plurality of discharge rubber channels corresponding one-to-one to the plurality of bushing mounting holes, and the discharge rubber channel is located at the lower end of the bushing mounting hole, is coaxially connected with the bushing rubber channel and extends to the bottom surface of the manifold plate.

[0016] In the present invention, the top surface of the manifold plate is provided with an upper plate body positioning hole adapted to the second positioning portion, and the valve needle bushing is installed based on the cooperation of the positioning member, the second positioning portion and the upper plate body positioning hole.

[0017] The beneficial effect of the present invention is that by arranging a bushing glue inlet groove on the outer wall of the valve needle bushing, the molten material is first diverted through the bushing glue inlet groove before entering the bushing glue channel, so that the molten material is diverted to the bushing glue inlet grooves on both sides of the bushing feeding position, flows along the bushing glue inlet groove, and flows into the bushing glue channel through the bushing glue inlets on both sides. The molten material is re-mixed around the valve needle, and the flow velocity of the molten material around the valve needle is equal, thereby avoiding local shearing of the molten material due to the flow velocity difference, thereby ensuring the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a hot runner mold in the prior art;

[0019] Figure 2 This is a schematic diagram of the internal structure of the valve needle bushing in Example 1;

[0020] Figure 3 is a three-dimensional diagram of a valve needle bushing according to the first embodiment;

[0021] Figure 4 This is a schematic diagram of the internal structure of the hot runner in Example 1;

[0022] Figure 5 This is a schematic diagram of the internal structure of the manifold plate in Example 1;

[0023] Figure 6 Schematic diagram of the external structure of the valve needle bushing of Example 2;

[0024] Figure 7 This is a schematic diagram of the internal structure of the valve needle bushing in Example 2;

[0025] Figure 8 This is a schematic diagram of the internal structure of the hot runner in Example 2;

[0026] Figure 9 Schematic diagram of the internal structure of the manifold plate in Example 2. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. Example 1

[0030] like Figure 2 and Figure 3As shown, this embodiment discloses a valve needle bushing, the interior of the valve needle bushing 1 is provided with a valve needle transition hole 11 and a bushing rubber channel 12 in sequence along the axis, the valve needle 2 passes through the valve needle transition hole 11 and the bushing rubber channel 12 along the center axis, the bushing rubber channel 12 extends to the bottom surface of the valve needle bushing 1, the valve needle transition hole 11 is located above the bushing rubber channel 12, and is connected to the bushing rubber channel 12 and extends to the top surface of the valve needle bushing 1. The aperture of the valve needle transition hole 11 is adapted to the outer diameter of the valve needle 2, and the aperture of the bushing rubber channel 12 is larger than the outer diameter of the valve needle 2; the outer wall of the valve needle bushing 1 is provided with a bushing rubber feed groove 13 along the circumferential direction, and a bushing rubber feed position is provided in the bushing rubber feed groove 13, and the bushing rubber feed position is used to dock with the diverter rubber channel 31 of the diverter plate 3, and the bushing rubber feed position serves as the feed port of the bushing rubber feed groove 13; the bushing rubber feed groove 13 is provided with at least one bushing rubber feed port 14 on both sides of the bushing rubber feed position, and the bushing rubber feed ports 14 are respectively connected to the bushing rubber channel 12. By arranging a sleeve glue inlet groove 13 on the outer wall of the valve needle sleeve 1, the molten material is first diverted through the sleeve glue inlet groove 13 before entering the sleeve glue channel 12, so that the molten material is diverted to the sleeve glue inlet grooves 13 on both sides of the sleeve feeding position, flows along the sleeve glue inlet groove 13, and flows into the sleeve glue channel 12 through the sleeve glue inlet ports 14 on both sides. The molten material is re-mixed around the valve needle 2, and the flow speed of the molten material around the valve needle 2 is equal, thereby avoiding local shearing and / or stratification of the molten material due to the flow speed difference, thereby avoiding the appearance of yellow and white line marks on the injection molded products and ensuring the quality of the products.

[0031] As a preferred embodiment, the bushing glue inlet groove 13 is provided with a bushing glue inlet 14 on both sides of the bushing glue inlet position. The bushing glue inlets 14 on both sides of the bushing glue inlet position are respectively located at both ends of the bushing glue inlet groove 13, and the bushing glue inlet 14 is 90° apart from the bushing glue inlet position along the circumferential direction. At this time, the two bushing glue inlets 14 are symmetrically arranged on both sides of the bushing glue inlet position, and the two bushing glue inlets 14 are arranged relative to each other, so that the molten material enters from the bushing glue inlet position, is diverted to the bushing glue inlet grooves 13 on both sides of the bushing glue inlet position, and after flowing the same distance, enters the bushing glue channel 12 through the bushing glue inlet 14. The molten material flows around the valve needle 2 to the central symmetry plane of the two bushing glue inlets 14 to remix. In this process, the flow distance and flow process of the molten material are exactly the same, so the flow rate of the molten material is equal, ensuring the quality of the product.

[0032] As a preferred embodiment, the bushing glue feeding groove 13 is an arc groove, that is, the cross section of the bushing glue feeding groove 13 is an arc surface; this makes the molten material flow more smoothly in the bushing glue feeding groove 13 and has less flow resistance.

[0033] Specifically, the valve needle bushing 1 of this embodiment includes a connecting section 15, a first main section 16 and a positioning section 17 arranged in sequence from top to bottom along the axis; the connecting section 15 is used to connect the cylinder assembly 4; the first main section 16 is adapted to the bushing mounting hole 33 of the manifold plate 3, and the bushing glue inlet groove 13 is provided on the outer wall of the first main section 16; the outer diameter of the positioning section 17 is larger than the outer diameter of the first main section 16, and the part of the positioning section 17 protruding from the first main section 16 is provided with a first positioning portion 171, and the first positioning portion 171 is a positioning section positioning hole or a positioning section positioning recess.

[0034] like Figure 4 and Figure 5 As shown, based on the valve needle bushing 1 disclosed above, this embodiment further discloses a hot runner, including a diverter plate 3, in which a plate body glue inlet 32, a plurality of diverter glue channels 31 respectively connected to the plate body glue inlet 32, and a plurality of bushing mounting holes 33 corresponding to the plurality of diverter glue channels 31 are provided; the above-mentioned valve needle bushing 1 is installed in each bushing mounting hole 33, and after installation, the diverter glue channel 31 corresponds to the bushing glue inlet position and is connected to the bushing glue inlet groove 13. The flow process of the molten material in the diverter plate 3 is as follows: it enters the diverter plate 3 from the plate body glue inlet 32, is diverted to each diverter glue channel 31, and flows into the bushing glue inlet position of the valve needle bushing 1 in the corresponding bushing mounting hole 33 through each diverter glue channel 31.

[0035] Specifically, the bushing mounting hole 33 passes through the top and bottom surfaces of the manifold plate 3, and the first main body section 16 is installed in the bushing mounting hole 33; the connecting section 15 protrudes from the top surface of the manifold plate 3 to connect the cylinder assembly 4; the positioning section 17 protrudes from the bottom surface of the manifold plate 3 to connect the nozzle assembly 5, and the top surface of the positioning section 17 abuts the bottom surface of the manifold plate 3, and the bottom surface of the manifold plate 3 is provided with a lower plate body positioning hole 34 that is adapted to the positioning section positioning portion 171. Based on the cooperation between the positioning member and the first positioning portion 171 and the lower plate body positioning hole 34, the valve needle bushing 1 is circumferentially positioned so that the diverter rubber channel 31 corresponds to the bushing glue feeding position of the bushing glue feeding groove 13, thereby completing the installation of the valve needle bushing 1. Example 2

[0036] like Figure 6 and Figure 7As shown, the present embodiment discloses a valve needle bushing 1, which is substantially the same as the valve needle bushing 1 of the first embodiment, except that the valve needle bushing 1 of the present embodiment includes a connecting positioning section 18 and a second main section 19 arranged in sequence from top to bottom along the axis; the connecting positioning section 18 is used to connect the cylinder assembly 4, the outer diameter of the connecting positioning section 18 is larger than the outer diameter of the second main section 19, and the portion of the connecting positioning section 18 protruding from the second main section 19 is provided with a second positioning portion 181, and the second positioning portion 181 is a connecting positioning hole or a connecting positioning recess; the second main section 19 is adapted to the bushing mounting hole 33 of the manifold plate 3, and the bushing glue inlet groove 13 is provided on the outer wall of the second main section 19.

[0037] Based on the valve needle bushing 1 disclosed in this embodiment, this embodiment also discloses a hot runner adapted to the valve needle bushing 1, such as Figure 8 and Figure 9 As shown, the hot runner of this embodiment is roughly the same as the hot runner of embodiment 1, and the difference is that: the bushing mounting hole 33 extends to the top surface of the diverter plate 3, and a plurality of discharge rubber channels 35 are also provided in the diverter plate 3, and the plurality of discharge rubber channels 35 correspond one-to-one to the plurality of bushing mounting holes 33. The discharge rubber channels 35 are located at the lower end of the bushing mounting hole 33 and are coaxially connected with the bushing mounting hole 33; the connecting positioning section 18 protrudes from the top surface of the diverter plate 3, and the connecting positioning section 18 abuts the top surface of the diverter plate 3. The top surface of the diverter plate 3 is provided with an upper plate body positioning hole that is compatible with the second positioning portion 181. Based on the cooperation between the positioning member and the second positioning portion 181 and the upper plate body positioning hole, the valve needle bushing 1 is circumferentially positioned so that the diverter rubber channel 31 corresponds to the bushing glue feeding position of the bushing glue feeding groove 13, thereby completing the installation of the valve needle bushing 1.

[0038] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the scope of protection of the present invention.

Claims

1. A valve needle bushing, wherein a bushing rubber channel is provided inside the valve needle bushing along the axis, and the bushing rubber channel extends to the bottom surface of the valve needle bushing, characterized in that: The outer wall of the valve needle bushing is provided with a bushing glue inlet groove along the circumferential direction. The bushing glue inlet groove has a bushing glue inlet position and at least one bushing glue inlet respectively provided on both sides of the bushing glue inlet position. The bushing glue inlets are respectively connected to the bushing glue channels.

2. The valve needle bushing according to claim 1, characterized in that: A valve needle transition hole is further provided inside the valve needle bushing along the axis. The valve needle transition hole is located above the bushing rubber channel, is communicated with the bushing rubber channel and extends to the top surface of the valve needle bushing.

3. The valve needle bushing according to claim 1, characterized in that: The valve needle bushing includes a connecting section, a first main section and a positioning section arranged in sequence from top to bottom along the axis. The bushing glue inlet groove is provided on the outer wall of the first main section. The outer diameter of the positioning section is larger than the outer diameter of the first main section, and the part of the positioning section protruding from the first main section is provided with a first positioning portion.

4. The valve needle bushing according to claim 1, characterized in that: The valve needle bushing includes a connecting positioning section and a second main section arranged in sequence from top to bottom along the axis, the bushing glue inlet groove is arranged on the outer wall of the second main section, the outer diameter of the connecting positioning section is larger than the outer diameter of the second main section, and the part of the connecting positioning section protruding from the second main section is provided with a second positioning portion.

5. The valve needle bushing according to claim 1, characterized in that: The bushing glue feeding groove is provided with a bushing glue feeding port on both sides of the bushing glue feeding position, and the two bushing glue feeding ports are respectively arranged at 90° intervals from the bushing glue feeding position along the circumferential direction.

6. Hot runner, characterized by: It includes a diverter plate, which is provided with a plate body glue inlet, a plurality of diverter glue channels respectively connected to the plate body glue inlet, and a plurality of bushing mounting holes corresponding to the plurality of diverter glue channels one by one; each of the bushing mounting holes is installed with a valve needle bushing as described in any one of claims 1 to 5, and after installation, the diverter glue channel corresponds to the bushing glue inlet position and is connected to the bushing glue inlet groove.

7. The hot runner according to claim 6, characterized in that: The bushing mounting hole passes through the top and bottom surfaces of the manifold plate, and the valve needle bushing installed in the bushing mounting hole is the valve needle bushing according to claim 3, wherein the connecting section protrudes from the top surface of the manifold plate, the first main body section is installed in the bushing mounting hole, and the positioning section abuts the bottom surface of the manifold plate.

8. The hot runner according to claim 7, characterized in that: The bottom surface of the manifold plate is provided with a lower plate body positioning hole adapted to the first positioning portion, and the valve needle bushing is installed based on the cooperation of the positioning member, the first positioning portion and the lower plate body positioning hole.

9. The hot runner according to claim 6, characterized in that: The bushing mounting hole extends to the top surface of the manifold plate, and the valve needle bushing installed in the bushing mounting hole is the valve needle bushing according to claim 4, wherein the connecting positioning section abuts against the top surface of the manifold plate, and the second main body section is installed in the bushing mounting hole; The manifold plate is further provided with a plurality of discharge rubber channels corresponding one to one with the plurality of bushing mounting holes. The discharge rubber channels are located at the lower end of the bushing mounting holes, are coaxially connected with the bushing rubber channels and extend to the bottom surface of the manifold plate.

10. The hot runner according to claim 9, characterized in that: The top surface of the manifold plate is provided with an upper plate body positioning hole adapted to the second positioning portion, and the valve needle bushing is installed based on the cooperation of the positioning member, the second positioning portion and the upper plate body positioning hole.

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