Hot nozzle of hot runner

Abstract

The utility model discloses a hot nozzle of a hot runner, which relates to the field of accessories of injection molding machines, and adopts the technical scheme that the hot nozzle comprises a base body and a spray head, a channel and a counter bore are formed in the base body, internal threads are formed on the inner circumferential wall of the counter bore, a straight pipe is arranged at one end of the spray head, the spray head is detachably connected with the straight pipe, and a sealing piece is arranged at the joint of the straight pipe and the spray head. Due to the arrangement of the straight pipe, impurities are not in contact with the inner wall of the channel any more, when blockage occurs, the heating assembly does not need to be separated from the base body, the straight pipe does not need to be detached from the channel and maintained and adjusted, the blockage problem is convenient to deal with, the straight pipe made of copper alloy is used, heat on the base body can be rapidly transmitted into the straight pipe, and the heat dissipation efficiency is improved. The heat transfer efficiency of the whole hot nozzle is high, and energy can be well saved.

Description

Technical Field

[0001] The utility model relates to the field of injection molding machine accessories, and more specifically, to a hot runner nozzle. Background Technique

[0002] A hot runner is a heating component system used in an injection mold for melting plastic particles and injecting them into the cavity of the mold. The hot runner generally consists of components such as nozzles, manifolds, and housings.

[0003] A cavity is formed in the housing. The nozzle injects the melted plastic particles into the cavity. The nozzle includes a nozzle head and a base body. One end of the base body is connected to a feed pipe. A channel for accommodating plastic particles is formed in the base body. In order to ensure the molten state of the plastic particles in the nozzle, a heating component is also provided on the outer surface of the base body.

[0004] During the use of the nozzle, impurities that are not cleaned up in the plastic particles are likely to accumulate in the channel. Long-term use will cause blockage of the channel or the nozzle head. When the channel is blocked, the entire nozzle needs to be removed from the hot runner, and then a special tool is used to dredge the inside of the nozzle. Since the heating component outside the base body is also connected to a cable, people also need to remove the heating component, and the process is rather cumbersome.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Content of the Utility Model

[0006] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a hot runner nozzle.

[0007] The above technical purpose of the utility model is achieved through the following technical solutions: A hot runner nozzle, including a base body and a nozzle head. A channel and a counterbore with a diameter larger than the channel are formed in the base body. An internal thread for connecting the nozzle head is formed on the inner peripheral wall of the counterbore. One end of the nozzle head is provided with a straight pipe having the same length as the channel. The straight pipe is used to accommodate plastic particles. The nozzle head is detachably connected to the straight pipe, and a seal is provided at the connection between the straight pipe and the nozzle head.

[0008] The utility model is further provided as follows: A threaded hole is formed in the nozzle head. One end of the straight pipe is threadedly connected in the threaded hole, and the thread rotation direction of the threaded hole is opposite to that of the internal thread.

[0009] The utility model is further provided as follows: A first annular groove is formed on the bottom wall of the counterbore. A second annular groove is formed at one end of the straight pipe. The seal is a thermal expansion ring placed in the first annular groove and the second annular groove.

[0010] The present utility model is further configured as follows: a square groove communicating with the second annular groove is formed on the end surface of the straight pipe, and a protrusion that can pass through the square groove and be embedded in the second annular groove is formed on the thermal expansion ring.

[0011] The present utility model is further configured as follows: a rounded corner is formed at one end of the thermal expansion ring away from the protrusion.

[0012] The present utility model is further configured as follows: a flat groove is formed on the outer peripheral wall of the straight pipe.

[0013] The present utility model is further configured as follows: the straight pipe is made of copper alloy.

[0014] To sum up, the present utility model has the following beneficial effects: when the hot nozzle is blocked due to impurities in the plastic particles, the nozzle can be removed from the base, and then the position of the blockage can be determined by observation. Then, the nozzle is separated from the straight pipe. If the nozzle is blocked, the nozzle is cleaned and adjusted. Otherwise, the straight pipe is cleaned and adjusted. The above settings enable the plastic particles not to contact the inner wall of the channel when passing through the hot nozzle, so that impurities will not accumulate on the inner wall of the channel. By removing the nozzle and the straight pipe from the base, the maintenance of the nozzle and the straight pipe can be completed without disassembling the heating component, making the treatment of the hot nozzle blockage problem more convenient. When the plastic particles pass through the nozzle, the pressure is relatively high. The setting of the seal makes it difficult for the plastic particles to enter the channel through the connection between the straight pipe and the nozzle, which preferably ensures the sealing performance between the nozzle and the straight pipe. Description of the Drawings

[0015] Figure 1 is a schematic structural view of the present utility model;

[0016] Figure 2 is a cross-sectional view of the present utility model;

[0017] Figure 3 is Figure 2 an enlarged schematic view of part A in

[0018] Figure 4 is a schematic structural view of the seal of the present utility model;

[0019] Figure 5 is a schematic structural view of the straight pipe of the present utility model.

[0020] In the figure: 1, base; 2, nozzle; 3, channel; 4, counterbore; 5, straight pipe; 6, seal; 7, threaded hole; 8, first annular groove; 9, second annular groove; 10, square groove; 11, protrusion; 12, flat groove. Detailed Description of the Embodiment

[0021] The present utility model will be described in detail below with reference to the drawings and embodiments.

[0022] A hot runner nozzle, such as Figure 1 and Figure 2 shown, includes a base body 1 and a nozzle head 2. A channel 3 and a counterbore 4 with a diameter larger than that of the channel 3 are formed in the base body 1. An internal thread for connecting the nozzle head 2 is formed on the inner peripheral wall of the counterbore 4. One end of the nozzle head 2 is provided with a straight pipe 5 installed in the channel 3. The straight pipe 5 is used to accommodate plastic particles. The nozzle head 2 and the straight pipe 5 are detachably connected. A seal 6 is arranged at the connection between the straight pipe 5 and the nozzle head 2. When the nozzle is blocked due to impurities in the plastic particles, the nozzle head 2 can be removed from the base body 1, and then the blockage position can be determined by observation. Then, the nozzle head 2 and the straight pipe 5 are separated. If the nozzle head 2 is blocked, the nozzle head 2 is cleaned and adjusted. Otherwise, the straight pipe 5 is cleaned and adjusted. The above settings enable the plastic particles not to contact the inner wall of the channel 3 when passing through the nozzle, so that impurities will not accumulate on the inner wall of the channel 3. By removing the nozzle head 2 and the straight pipe 5 from the base body 1, the maintenance of the nozzle head 2 and the straight pipe 5 can be completed without disassembling the heating component, making the treatment of the nozzle blockage problem more convenient. When the plastic particles pass through the nozzle head 2, the pressure is relatively high. The setting of the seal 6 makes it difficult for the plastic particles to enter the channel 3 through the connection between the straight pipe 5 and the nozzle head 2, which preferably ensures the sealing performance between the nozzle head 2 and the straight pipe 5.

[0023] such as Figures 2 to 4As shown, a threaded hole 7 is provided on the nozzle 2, and one end of the straight pipe 5 is threadedly connected in the threaded hole 7. The nozzle 2 connected by threading has the advantage of high connection strength, making it difficult for the nozzle 2 to separate from the straight pipe 5. At the same time, this setting also makes the disassembly of the nozzle 2 and the straight pipe 5 relatively simple. The thread direction of the threaded hole 7 is opposite to that of the internal thread. This setting makes the screwing direction of the straight pipe 5 installed on the nozzle 2 opposite to the screwing direction of the nozzle 2 installed on the base 1. During the installation of the nozzle 2, the straight pipe 5 will contact the inner wall of the channel 3, and relative sliding will occur between the two. The inner wall of the channel 3 will generate a reaction force on the straight pipe 5. However, due to the opposite thread directions, this reaction force cannot loosen the connection between the straight pipe 5 and the nozzle 2, thus further ensuring the connection strength between the straight pipe 5 and the nozzle 2. A first annular groove 8 is provided on the bottom wall of the counterbore 4, and a second annular groove 9 is provided at one end of the straight pipe 5. The seal 6 is a thermal expansion ring placed in the first annular groove 8 and the second annular groove 9. Specifically, the thermal expansion ring is made of high-temperature resistant fluororubber. During the use of the hot nozzle, the heating component provides heat to the base 1 to melt the plastic particles in the hot nozzle. Part of this heat will be absorbed by the thermal expansion ring and cause the thermal expansion ring to expand due to heat, sealing the gap at the connection between the nozzle 2 and the straight pipe 5. Thus, when the molten plastic particles pass through the connection between the nozzle 2 and the straight pipe 5, it is not easy to enter the channel 3 from the gap, which preferably ensures the sealing performance. During the process of the thermal expansion ring expanding due to heat, the outer shape of the thermal expansion ring can be well restricted by the inner walls of the first annular groove 8 and the second annular groove 9. When the thermal expansion ring expands due to heat, the inner walls of the first annular groove 8 and the second annular groove 9 can play a good guiding role in the deformation of the thermal expansion ring, so that the thermal expansion ring can better seal the connection between the nozzle 2 and the straight pipe 5. A square groove 10 communicating with the second annular groove 9 is provided on the end face of the straight pipe 5, and a protrusion 11 that can pass through the square groove 10 and be embedded in the second annular groove 9 is formed on the thermal expansion ring. Specifically, the protrusion 11 is made of copper alloy and is adhesively connected to the thermal expansion ring. The cross-section of the second annular groove 9 is L-shaped. When installing the thermal expansion ring, align the protrusion 11 with the square groove 10 and then embed it. Then move the protrusion 11 along the inner wall of the second annular groove 9 so that the protrusion 11 cannot escape from the second annular groove 9. The setting of the protrusion 11 makes it difficult for the thermal expansion ring to escape during the subsequent installation of the straight pipe 5 on the nozzle 2, so that the thermal expansion ring can be better maintained in the second annular groove 9 and the first annular groove 8.

[0024] As Figure 4 and Figure 5As shown, a rounded corner is formed at one end of the thermal expansion ring away from the protrusion 11. During the process of installing the thermal expansion ring into the first annular groove 8 through the straight pipe 5, the smoother end of the thermal expansion ring will contact the inner wall of the first annular groove 8, enabling the smoother end of the thermal expansion ring to enter the second annular groove 9 more conveniently. A flat groove 12 is provided on the outer peripheral wall of the straight pipe 5. The setting of the flat groove 12 provides a better force application point on the outer wall of the straight pipe 5, allowing people to remove the straight pipe 5 from the nozzle 2 by applying force at this point. The straight pipe 5 is made of copper alloy, and the excellent thermal conductivity of the copper alloy quickly transfers the heat on the base body 1 to the inner wall of the straight pipe 5, resulting in a relatively high heat transfer efficiency of the entire hot nozzle.

[0025] The above description is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. Hot runner nozzle, characterized by: The invention comprises a base (1) and a nozzle (2), wherein the base (1) is provided with a channel (3) and a countersunk hole (4) having a diameter larger than the channel (3), an internal thread for connecting the nozzle (2) is formed on the inner peripheral wall of the countersunk hole (4), a straight tube (5) having the same length as the channel (3) is provided at one end of the nozzle (2), the straight tube (5) being used to accommodate plastic particles, the nozzle (2) and the straight tube (5) being detachably connected, and a sealing member (6) is provided at the connection between the straight tube (5) and the nozzle (2).

2. The hot runner nozzle according to claim 1, characterized in that: The nozzle (2) is provided with a threaded hole (7), one end of the straight pipe (5) is threadedly connected in the threaded hole (7), and the thread rotation direction of the threaded hole (7) is opposite to that of the internal thread.

3. The hot runner nozzle according to claim 2, characterized in that: A first annular groove (8) is provided on the bottom wall of the counterbore (4), a second annular groove (9) is provided at one end of the straight tube (5), and the sealing member (6) is a thermal expansion ring placed in the first annular groove (8) and the second annular groove (9).

4. The hot runner nozzle according to claim 3, characterized in that: A square groove (10) communicating with the second annular groove (9) is formed on the end surface of the straight tube (5), and a protrusion (11) that can pass through the square groove (10) and be embedded in the second annular groove (9) is formed on the thermal expansion ring.

5. The hot runner nozzle according to claim 4, characterized in that: One end of the heat expansion ring away from the protrusion (11) is formed with a rounded corner.

6. The hot runner nozzle according to claim 5, characterized in that: A flat groove (12) is provided on the outer peripheral wall of the straight tube (5).

7. The hot runner nozzle according to claim 6, characterized in that: The straight tube (5) is made of copper alloy.

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