Multi-head side glue feeding structure of hot runner system

Abstract

The utility model discloses a multi-head side glue feeding structure of a hot runner system, which relates to the technical field of hot runners and comprises a hot runner main body, a main runner is arranged in the hot runner main body, a plurality of uniformly distributed sub-runners are arranged on the outer surface of the hot runner main body in a penetrating manner, and the sub-runners are communicated with the hot runner main body. A heat conduction copper pipe is fixedly connected into the branch runner, external threads are arranged on the outer surface of the end, away from the main runner, of the heat conduction copper pipe, and a nozzle assembly is arranged at the end, away from the main runner, of the heat conduction copper pipe. According to the multi-head side glue feeding device, the good filling effect can still be kept when small-size or fine injection molding parts are machined, the multi-head side glue feeding and the elastic telescopic design of the injection nozzles are combined, the melt flowing uniformity can be improved, the problem of uneven filling is solved, and therefore the overall quality of the injection molding parts is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runners, in particular to a multi-head side glue feeding structure of a hot runner system. Background Art

[0002] A hot runner is a heating component system used in injection molds to inject melted plastic particles into the mold cavity. A hot runner mold is a new structure that heats the runners and sprues of a traditional mold or a three-plate mold, eliminating the need to remove the runners and sprues during each molding process.

[0003] The nozzle position of the current hot runner system is relatively fixed. When processing smaller or more delicate injection molded parts, the nozzle may not be able to penetrate deep into the mold, resulting in a poor melt flow path and uneven flow, which in turn causes insufficient filling in certain areas, thereby affecting the quality of the injection molded parts. To this end, a hot runner system with multiple side-feeding structures is proposed to solve the above problems. Utility Model Content

[0004] In order to solve the above technical problems, a multi-head side-feeding structure for a hot runner system is provided. This technical solution solves the problem raised in the above background technology that the nozzle position of the current hot runner system is relatively fixed. When processing smaller or more delicate injection molded parts, the nozzle may not be able to penetrate deep into the mold, resulting in poor melt flow path and uneven flow, which in turn causes insufficient filling in certain areas, thereby affecting the quality of the injection molded parts.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A multi-head side-feeding structure for a hot runner system includes a hot runner body, a main runner is defined within the hot runner body, and a plurality of evenly distributed branch runners are defined on the outer surface of the hot runner body. The branch runners are connected to the main runner, and a heat-conducting copper tube is fixedly connected to the inside of the branch runner. The outer surface of the heat-conducting copper tube at one end away from the main runner is provided with an external thread, and a nozzle assembly is provided at the end of the heat-conducting copper tube away from the main runner.

[0007] In which, the nozzle assembly includes a connecting piece, which is threadedly connected to the outer surface of the heat-conducting copper tube through an external thread, a sliding sleeve is fixedly connected to the inner side of the connecting piece, and an injection nozzle is slidably connected to the inner side of the sliding sleeve, and an end of the injection nozzle close to the heat-conducting copper tube is fixedly connected to a sealing sliding block, the sealing sliding block is slidably connected to the interior of the heat-conducting copper tube and the outer surface of the sealing sliding block is tightly against the inner wall of the heat-conducting copper tube, a plurality of evenly distributed sliding grooves are provided at one end of the sliding sleeve close to the sealing sliding block, a return spring is fixedly connected to the interior of the sliding groove, the other end of the return spring is fixedly connected to a sliding seat, the sliding seat is slidably connected to the interior of the sliding groove, and the end of the sliding seat away from the return spring is fixedly connected to a connecting rod, and the other end of the connecting rod is fixedly connected to an end of the sealing sliding block close to the sliding sleeve.

[0008] Preferably, a connecting pipe is fixedly connected to the upper end of the hot runner body, and the connecting pipe is communicated with the main runner.

[0009] Preferably, a main heating cavity is provided inside the hot runner body and outside the main runner, and a plurality of evenly distributed first heating resistance wires are provided inside the main heating cavity.

[0010] Preferably, a plurality of auxiliary heating cavities are provided inside the hot runner body and outside the plurality of heat-conducting copper tubes, and a plurality of evenly distributed second heating resistance wires are provided inside the auxiliary heating cavities.

[0011] Preferably, a through hole is formed through one end of the sealing sliding block close to the injection nozzle, and the through hole is communicated with the interior of the injection nozzle.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This proposal proposes a multi-head side-feeding structure for a hot runner system. The nozzle assembly is installed on the heat-conducting copper tube by means of a threaded connection, which is convenient for maintenance and disassembly. The injection nozzle in the nozzle assembly can be elastically retracted and can adapt to slight changes in the mold, ensuring that a good filling effect can still be maintained when processing smaller or more delicate injection molded parts. The combination of the multi-head side-feeding and the elastic retractable design of the injection nozzle helps to improve the uniformity of the melt flow, reduce the problem of uneven filling, and thus improve the overall quality of the injection molded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is a schematic structural diagram of the main flow channel in the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the heat-conducting copper tube in the utility model;

[0017] Figure 4 This is a schematic structural diagram of the nozzle assembly in the present utility model;

[0018] Figure 5 for Figure 4 A local enlarged schematic diagram of point A in the middle.

[0019] The numbers in the figure are:

[0020] 1. Hot runner body; 2. Main runner; 3. Branch runner; 4. Thermal copper tube; 401, external thread;

[0021] 5. Nozzle assembly; 501. Connecting piece; 502. Sliding sleeve; 503. Injection nozzle; 504. Sealing sliding block; 505. Slide groove; 506. Return spring; 507. Sliding seat; 508. Connecting rod;

[0022] 6. Connecting pipe; 7. Main heating chamber; 8. First heating resistance wire; 9. Secondary heating chamber; 10. Second heating resistance wire. DETAILED DESCRIPTION

[0023] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0024] Reference Figure 1-Figure 5 As shown, a hot runner system multi-head side-feeding structure includes a hot runner body 1, a main runner 2 is defined within the hot runner body 1, and a plurality of evenly distributed branch runners 3 are defined on the outer surface of the hot runner body 1. The branch runners 3 are connected to the main runner 2. A heat-conducting copper tube 4 is fixedly connected to the inside of the branch runner 3. The outer surface of the heat-conducting copper tube 4 at the end away from the main runner 2 is provided with an external thread 401. A nozzle assembly 5 is provided at the end of the heat-conducting copper tube 4 away from the main runner 2.

[0025] The nozzle assembly 5 includes a connector 501, which is threadedly connected to the outer surface of the heat-conducting copper tube 4 through an external thread 401. A sliding sleeve 502 is fixedly connected to the inner side of the connector 501. An injection nozzle 503 is slidably connected to the inner side of the sliding sleeve 502. An end of the injection nozzle 503 close to the heat-conducting copper tube 4 is fixedly connected to a sealing sliding block 504. The sealing sliding block 504 is slidably connected to the inside of the heat-conducting copper tube 4 and the outer surface of the sealing sliding block 504 is in close contact with the inner wall of the heat-conducting copper tube 4. A plurality of evenly distributed sliding grooves 505 are provided at one end of the sliding sleeve 502 close to the sealing sliding block 504, and a return spring 506 is fixedly connected to the inside of the sliding groove 505, and the other end of the return spring 506 is fixedly connected to a sliding seat 507, and the sliding seat 507 is slidably connected to the inside of the sliding groove 505, and the end of the sliding seat 507 away from the return spring 506 is fixedly connected to a connecting rod 508, and the other end of the connecting rod 508 is fixedly connected to the end of the sealing sliding block 504 close to the sliding sleeve 502.

[0026] Furthermore, the injection nozzle 503 is initially in a retracted state and is located on the inner side of the sliding sleeve 502, so that it can penetrate into the interior of the mold. The nozzle assembly 5 is installed on the heat-conducting copper tube 4 by means of a threaded connection, which is convenient for maintenance and disassembly, and reduces equipment downtime. During the injection process, the melt will flow into the heat-conducting copper tubes 4 of each branch channel 3 through the main channel 2. After the melt flows into the heat-conducting copper tube 4, it will squeeze the sealing sliding block 504, thereby pushing the sealing sliding block 504 to slide, so that the connecting rod 508 pushes the sliding seat 507 to compress the reset spring 506, thereby pushing the injection nozzle 503 out for injection. The elastically shrinkable injection nozzle 503 can penetrate into the interior of the mold when processing small-volume or fine injection-molded parts, ensuring that the melt can flow smoothly to each cavity, reducing the probability of insufficient filling problems.

[0027] Furthermore, after stopping the injection molding, the injection molding machine no longer applies pressure, and the melt in the heat-conducting copper tube 4 will lose the external pressure. At this time, under the action of the return spring 506, the injection nozzle 503 will gradually shrink back into the sliding sleeve 502.

[0028] Furthermore, a connecting pipe 6 is fixedly connected to the upper end of the hot runner body 1, and the connecting pipe 6 is communicated with the main channel 2. The connecting pipe 6 is used to connect to the external melt supply system. The interface of the connecting pipe 6 can adopt a standardized interface to facilitate installation and disassembly.

[0029] Furthermore, a main heating chamber 7 is provided inside the hot runner body 1 on the outside of the main channel 2, and a number of evenly distributed first heating resistance wires 8 are provided inside the main heating chamber 7. A number of auxiliary heating chambers 9 are provided inside the hot runner body 1 on the outside of the number of heat-conducting copper tubes 4, and a number of evenly distributed second heating resistance wires 10 are provided inside the auxiliary heating chamber 9. The first heating resistance wire 8 and the main heating chamber 7 are used to heat the main channel 2, and the second heating resistance wire 10 and the auxiliary heating chamber 9 are used to heat the heat-conducting copper tube 4 to ensure that the transported melt always maintains a suitable temperature. The heat-conducting copper tube 4 can quickly conduct heat to ensure that the temperature of the melt is stable during the transportation process, reducing the risk of cooling and solidification.

[0030] Furthermore, a temperature sensor is provided in the hot runner body 1 to monitor the temperature of the main heating chamber 7 and the auxiliary heating chamber 9 in real time to ensure temperature stability.

[0031] Furthermore, a through hole is formed through one end of the sealing sliding block 504 close to the injection nozzle 503 , and the through hole is communicated with the interior of the injection nozzle 503 , and the through hole provides a path for the flow of the melt.

[0032] Working principle: When in use, connect the connecting pipe 6 to the external melt supply system. The melt first enters the main channel 2 of the hot runner body 1, and then flows into the heat-conducting copper tube 4 of each branch channel 3. The first heating resistance wire 8 in the main heating chamber 7 and the second heating resistance wire 10 in the auxiliary heating chamber 9 work simultaneously to heat the main channel 2 and the heat-conducting copper tube 4 to ensure that the melt is maintained at an appropriate temperature to prevent cooling and solidification. After the melt flows into the heat-conducting copper tube 4, the pressure caused by the melt will push the sealing sliding block 504, so that the connecting rod 508 drives the sliding seat 507 to compress the reset spring 506, and then the injection nozzle 503 is pushed outward for injection. The injection molding process is completed, the injection machine stops applying pressure, and the melt loses external pressure in the heat-conducting copper tube 4. At this time, under the action of the reset spring 506, the injection nozzle 503 is gradually retracted into the sliding sleeve 502.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed for the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot runner system with multiple side-feeding structure, characterized in that: The invention comprises a hot runner body (1), wherein a main flow channel (2) is provided inside the hot runner body (1), and a plurality of evenly distributed branch flow channels (3) are provided through the outer surface of the hot runner body (1), wherein the branch flow channels (3) are connected to the main flow channel (2), and a heat-conducting copper tube (4) is fixedly connected inside the branch flow channel (3), wherein an outer surface of the end of the heat-conducting copper tube (4) away from the main flow channel (2) is provided with an external thread (401), and a nozzle assembly (5) is provided at the end of the heat-conducting copper tube (4) away from the main flow channel (2); The nozzle assembly (5) includes a connector (501), the connector (501) is threadedly connected to the outer surface of the heat-conducting copper tube (4) through an external thread (401), a sliding sleeve (502) is fixedly connected to the inner side of the connector (501), an injection nozzle (503) is slidably connected to the inner side of the sliding sleeve (502), and an end of the injection nozzle (503) close to the heat-conducting copper tube (4) is fixedly connected to a sealing sliding block (504), the sealing sliding block (504) is slidably connected to the inside of the heat-conducting copper tube (4), and the outer surface of the sealing sliding block (504) is in close contact with the inner side of the heat-conducting copper tube (4). The sliding sleeve (502) is provided with a plurality of evenly distributed sliding grooves (505) at one end close to the sealing sliding block (504), the interior of the sliding groove (505) is fixedly connected with a return spring (506), the other end of the return spring (506) is fixedly connected with a sliding seat (507), the sliding seat (507) is slidably connected to the interior of the sliding groove (505), the end of the sliding seat (507) away from the return spring (506) is fixedly connected with a connecting rod (508), and the other end of the connecting rod (508) is fixedly connected to the end of the sealing sliding block (504) close to the sliding sleeve (502).

2. The multi-head side-feeding structure of a hot runner system according to claim 1, characterized in that: The upper end of the hot runner body (1) is fixedly connected to a connecting pipe (6), and the connecting pipe (6) is in communication with the main flow channel (2).

3. The multi-head side-feeding structure of a hot runner system according to claim 1, characterized in that: A main heating chamber (7) is provided inside the hot runner body (1) and outside the main runner (2), and a plurality of evenly distributed first heating resistance wires (8) are provided inside the main heating chamber (7).

4. The multi-head side-feeding structure of a hot runner system according to claim 1, characterized in that: Several auxiliary heating chambers (9) are provided inside the hot runner body (1) and outside the several heat-conducting copper tubes (4), and several evenly distributed second heating resistance wires (10) are provided inside the auxiliary heating chambers (9).

5. The multi-head side-feeding structure of a hot runner system according to claim 1, characterized in that: A through hole is formed through one end of the sealing sliding block (504) close to the injection nozzle (503), and the through hole is communicated with the interior of the injection nozzle (503).

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