Temperature detection device of injection molding machine heater

Abstract

The utility model discloses a temperature detection device for a heater of an injection molding machine, which is characterized in that charging barrel inner heat conduction pieces are arranged on screw charging barrels on two sides of the upper part of each heating ring, and first thermocouples are arranged in the charging barrel inner heat conduction pieces; the temperature in the screw charging barrel can be conducted to the heat conduction piece in the charging barrel and is detected through the first thermocouples, so that the first thermocouples can accurately detect the temperature of each section after the heating ring in the screw charging barrel is heated, and the heating temperature change in the charging barrel is monitored; through the outward heat conduction piece arranged on the screw charging barrel on one side of the lower part of each heating ring and the second thermocouple arranged in the outward heat conduction piece, the outward heat conduction piece extends to the inner side of the corresponding heating ring, so that the temperature of the heating ring can be conducted to the outward heat conduction piece and is detected through the second thermocouple; therefore, each second thermocouple can accurately detect the heating temperature of the corresponding heating ring so as to monitor the heating condition of each heating ring.

Description

Technical Field

[0001] This application relates to the technical field of injection molding equipment, and particularly to a temperature detection device for an injection molding machine heater. Background Art

[0002] In the modern plastic processing industry, injection molding machines are one of the important production equipments. The injection molding machine injects molten plastic materials into molds through a screw barrel to form various plastic products. In order to make the plastic materials in the screw barrel reach a suitable molten state, heaters are usually installed on the outer surface of the screw barrel to provide the required heat. In the prior art, a thermocouple is often installed on the screw barrel for temperature detection to monitor and adjust the heating temperature of the screw barrel. However, the traditional thermocouple temperature detection method can only measure the surface temperature of the screw barrel and cannot accurately reflect the actual temperature inside the screw barrel. Since the heat conduction process in the screw barrel may be affected by materials, structures, and environmental factors, there may be a large temperature difference between the surface temperature and the internal temperature. This temperature difference will cause a deviation between the actual heating effect and the detection result, affecting the stability of the injection molding process and the quality of the final product.

[0003] Therefore, the existing temperature detection devices have certain limitations and cannot comprehensively and accurately reflect the overall temperature of the screw barrel, especially unable to evaluate the heating effect of the heater on the inside of the screw barrel. To address this problem, an improved temperature detection device is urgently needed, which can more comprehensively and accurately monitor the temperature of the screw barrel to ensure the stability of the injection molding process and the improvement of product quality. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of this application is to provide a temperature detection device for an injection molding machine heater to solve the problems raised in the above background art.

[0005] According to one aspect of this application, a temperature detection device for an injection molding machine heater, the injection molding machine includes a screw barrel and a plurality of heating coils sleeved on the outer surface of the screw barrel, and adjacent two of the heating coils are distributed at intervals. On both sides of the upper part of each heating coil, a barrel internal heat conductor is installed on the screw barrel, and at the gap position between every two adjacent heating coils, a barrel internal heat conductor is provided. The lower end of each barrel internal heat conductor communicates with the screw barrel, and a first thermocouple is installed in each barrel internal heat conductor. On one side of the lower part of each heating coil, an outward heat conductor is installed on the screw barrel, each outward heat conductor extends to the inner side position of the corresponding heating coil, and a second thermocouple is installed in each outward heat conductor. Adjacent two heating coils are arranged closely adjacent to the corresponding barrel internal heat conductor and the outward heat conductor.

[0006] Preferably, the heat conducting member in the barrel includes a lower heat conducting sleeve, a first mounting plate, and a first connecting sleeve. The top of the lower heat conducting sleeve is fixedly connected to the bottom of the first mounting plate, the top of the first mounting plate is fixedly connected to the bottom of the first connecting sleeve, and the lower heat conducting sleeve, the first mounting plate, and the first connecting sleeve are of an integrally formed structure. The interiors of the lower heat conducting sleeve, the first mounting plate, and the first connecting sleeve are connected in communication. Each of the screw barrels on both sides of the upper part of the heating coil is provided with a strip-shaped groove, and a strip-shaped groove is provided at the gap position between every two adjacent heating coils. Each strip-shaped groove is provided with a mounting hole, and the mounting hole communicates with the inner and outer side walls of the screw barrel. The lower heat conducting sleeve is adapted to the shape of the mounting hole and is inserted into the mounting hole, and the lower end surface of the lower heat conducting sleeve is flush with the inner side wall of the screw barrel. The first mounting plate is embedded in the strip-shaped groove and fixedly connected by screws. The temperature detection probe of the first thermocouple extends from the first connecting sleeve into the lower heat conducting sleeve, and the first thermocouple is snap-fitted with the upper end opening of the first connecting sleeve.

[0007] Preferably, the lower end of the mounting hole is of an inverted frustum structure, and the lower end of the lower heat conducting sleeve corresponds to an inverted frustum structure. A high-temperature resistant gasket is provided between the first mounting plate and the strip-shaped groove, and a high-temperature resistant sealant is provided between the outer side wall of the lower heat conducting sleeve and the inner side wall of the mounting hole. A through hole is formed through the first mounting plate, and the through hole communicates with the outer side wall of the lower heat conducting sleeve.

[0008] Preferably, the outward heat conducting member includes a second mounting plate, an extended heat conducting plate, and a second connecting sleeve. The top of the second connecting sleeve is fixedly connected to the second mounting plate. An extended heat conducting plate is fixedly provided on one side of the second mounting plate, and the second mounting plate, the extended heat conducting plate, and the second connecting sleeve are of an integrally formed structure. Each of the screw barrels on one side of the lower part of the heating coil is provided with a special-shaped groove. The second mounting plate and the extended heat conducting plate are embedded in the special-shaped groove, and the extended heat conducting plate is located at the inner side position corresponding to the heating coil. The second mounting plate is fixedly connected to the special-shaped groove by screws. The temperature detection probe of the second thermocouple extends into the second connecting sleeve, and the second thermocouple is snap-fitted with the lower end opening of the second connecting sleeve.

[0009] Preferably, the heat conducting member in the barrel and the outward heat conducting member are made of boron nitride ceramic material.

[0010] Preferably, both the first thermocouple and the second thermocouple are compression spring type thermocouples.

[0011] The advantages of this application compared with the prior art are as follows: For the temperature detection device of an injection molding machine heater in this application, by providing a heat conductor inside the screw barrel disposed on both sides of the upper part of each heating coil and the first thermocouple installed therein, since the lower end of the heat conductor inside the barrel can communicate with the inner side of the barrel, the temperature inside the screw barrel can be thermally conducted to the heat conductor inside the barrel, and the first thermocouple can detect the temperature after thermal conduction in the heat conductor inside the barrel. Thus, each first thermocouple can accurately detect the temperature of each section after heating by the heating coil inside the screw barrel of the injection molding machine, facilitating better monitoring of the change in the heating temperature inside the screw barrel of the injection molding machine. By providing an outward heat conductor and the second thermocouple installed therein on the screw barrel on one side of the lower part of each heating coil, since the outward heat conductor extends to the inner side position of the corresponding heating coil, the temperature of the heating coil can be thermally conducted to the outward heat conductor, and the second thermocouple can detect the temperature after thermal conduction in the outward heat conductor. Thus, each second thermocouple can accurately detect the heating temperature of the corresponding heating coil, facilitating better monitoring of the heating condition of each heating coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. 6 is a perspective view of a temperature detection device of an injection molding machine heater according to an embodiment of the present application.

[0013] Figure 2 FIG. 10 is a main sectional view of a temperature detection device of an injection molding machine heater according to an embodiment of the present application.

[0014] Figure 3 FIG. 14 is Figure 2 a schematic enlarged view of the structure of part A in FIG.

[0015] Figure 4 FIG. 20 is Figure 2 a schematic enlarged view of the structure of part B in FIG.

[0016] Figure 5 FIG. 26 is a side sectional view of a temperature detection device of an injection molding machine heater according to an embodiment of the present application.

[0017] Figure 6 FIG. 30 is a perspective exploded view of the heat conductor inside the barrel of a temperature detection device of an injection molding machine heater according to an embodiment of the present application.

[0018] Figure 7 FIG. 34 is a perspective exploded view of the outward heat conductor of a temperature detection device of an injection molding machine heater according to an embodiment of the present application.

[0019] Reference numerals: 1, screw barrel; 2, heating coil; 3, heat conducting member inside the barrel; 31, lower heat conducting sleeve; 32, first mounting plate; 33, first connecting sleeve; 4, first thermocouple; 5, external heat conducting member; 51, second mounting plate; 52, extending heat conducting plate; 53, second connecting sleeve; 6, second thermocouple; 7, strip-shaped groove; 8, mounting hole; 9, high-temperature gasket; 10, high-temperature sealant; 11, through hole; 12, special-shaped groove. Detailed implementation mode

[0020] In order to make the content of this application easier to be clearly understood, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the Figure 2 accompanying drawings, and the terms "inside" and "outside" respectively refer to the directions towards or away from the geometric center of a specific component. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] Such as Figure 1 and Figure 2As shown in the figure, a temperature detection device for an injection molding machine heater. The injection molding machine includes a screw barrel 1 and a plurality of heating coils 2 sleeved on the outer surface of the screw barrel 1. Adjacent two heating coils 2 are arranged at intervals. On both sides of the upper part of each heating coil 2, a heat conducting member 3 inside the barrel is installed on the screw barrel 1, and a heat conducting member 3 inside the barrel is arranged at the interval position between every two adjacent heating coils 2. The lower end of each heat conducting member 3 inside the barrel is communicated with the screw barrel 1, and a first thermocouple 4 is installed in each heat conducting member 3 inside the barrel. On one side of the lower part of each heating coil 2, an outward heat conducting member 5 is installed on the screw barrel 1. Each outward heat conducting member 5 extends to the inner side position of the corresponding heating coil 2, and a second thermocouple 6 is installed in each outward heat conducting member 5. Adjacent two heating coils 2 are arranged closely next to the corresponding heat conducting member 3 inside the barrel and the outward heat conducting member 5; in this design, through the heat conducting member 3 inside the barrel arranged on both sides of the upper part of each heating coil 2 and the first thermocouple 4 installed therein, since the lower end of the heat conducting member 3 inside the barrel can be communicated with the inner side of the barrel, the temperature inside the screw barrel 1 can be thermally conducted to the heat conducting member 3 inside the barrel, and the first thermocouple 4 can detect the temperature after thermal conduction in the heat conducting member 3 inside the barrel, so that each first thermocouple 4 can accurately detect the temperature of each section after heating by the heating coil 2 inside the screw barrel 1 of the injection molding machine, facilitating better monitoring of the heating temperature change inside the screw barrel 1 of the injection molding machine; through the outward heat conducting member 5 arranged on one side of the lower part of each heating coil 2 and the second thermocouple 6 installed therein, since the outward heat conducting member 5 extends to the inner side position of the corresponding heating coil 2, the temperature of the heating coil 2 can be thermally conducted to the outward heat conducting member 5, and the second thermocouple 6 can detect the temperature after thermal conduction in the outward heat conducting member 5, so that each second thermocouple 6 can accurately detect the heating temperature of the corresponding heating coil 2, facilitating better monitoring of the heating condition of each heating coil 2.

[0022] In one embodiment, the heat conducting member 3 inside the barrel and the outward heat conducting member 5 are made of boron nitride ceramic material. Boron nitride ceramic has high thermal conductivity, and the thermal conductivity of boron nitride ceramic can be as high as 600 W / m·K, which can better conduct the temperature inside the barrel. Moreover, boron nitride ceramic also has good high temperature resistance and electrical insulation properties. It can withstand high temperatures above 2000 °C in air and can maintain its insulation performance at high temperatures.

[0023] In one embodiment, in combination with Figure 3 、 Figure 5 and Figure 6, the heat conducting member 3 in the barrel includes a lower heat conducting sleeve 31, a first mounting plate 32 and a first connecting sleeve 33. The top of the lower heat conducting sleeve 31 is fixedly connected to the bottom of the first mounting plate 32, and the top of the first mounting plate 32 is fixedly connected to the bottom of the first connecting sleeve 33. Moreover, the lower heat conducting sleeve 31, the first mounting plate 32 and the first connecting sleeve 33 are integrally formed structures, and the interiors of the lower heat conducting sleeve 31, the first mounting plate 32 and the first connecting sleeve 33 are interconnected. Strip-shaped grooves 7 are provided on the screw barrel 1 on both sides of the upper part of each heating coil 2, and a strip-shaped groove 7 is arranged at the gap position between every two adjacent heating coils 2. An installation hole 8 is provided in each strip-shaped groove 7. The installation hole 8 communicates with the inner and outer side walls of the screw barrel 1, and the lower heat conducting sleeve 31 is adapted to the shape of the installation hole 8 and is inserted into the installation hole 8, so that the lower heat conducting sleeve 31 can better conduct the temperature inside the screw barrel 1. Moreover, a high-temperature sealant 10 is provided between the outer side wall of the lower heat conducting sleeve 31 and the inner side wall of the installation hole 8, which can ensure the tightness inside the screw barrel 1 and prevent the molten plastic material inside the screw barrel 1 from leaking. In addition, the installation hole 8 is arranged at the upper part of the screw barrel 1, which can also prevent the molten plastic material inside the screw barrel 1 from leaking to a certain extent; the lower end face of the lower heat conducting sleeve 31 is flush with the inner side wall of the screw barrel 1 to avoid interference between the screw inside the screw barrel 1 and the lower end of the lower heat conducting sleeve 31. The lower end of the installation hole 8 is of an inverted frustum structure, and the lower end of the lower heat conducting sleeve 31 corresponds to an inverted frustum structure to reduce the communication area between the lower end of the lower heat conducting sleeve 31 and the inside of the screw barrel 1 and also reduce the occurrence of leakage; the first mounting plate 32 is embedded in the strip-shaped groove 7 and fixedly connected by screws, and a high-temperature gasket 9 is provided between the first mounting plate 32 and the strip-shaped groove 7, which can further increase the tightness between the heat conducting member 3 in the barrel and the installation hole 8; the first thermocouple 4 is a compression spring type thermocouple. The temperature detection probe of the first thermocouple 4 extends from inside the first connecting sleeve 33 into the lower heat conducting sleeve 31, and the compression sleeve of the first thermocouple 4 is snap-fitted with the clamping post at the upper end opening of the first connecting sleeve 33; in addition, a through hole 11 is provided through the first mounting plate 32, and the through hole 11 communicates with the outer side wall of the lower heat conducting sleeve 31. Thus, when it is necessary to remove the heat conducting member 3 in the barrel from the installation hole 8, a glue solvent is poured into the position of the high-temperature sealant 10 from the through hole 11 to dissolve it, which is convenient for removing the heat conducting member 3 in the barrel.

[0024] In one embodiment, referring to Figure 4 、 Figure 5 and Figure 7, the outward heat conducting member 5 includes a second mounting plate 51, an extended heat conducting plate 52 and a second connecting sleeve 53. The top of the second connecting sleeve 53 is fixedly connected to the second mounting plate 51. One side of the second mounting plate 51 is fixedly provided with the extended heat conducting plate 52, and the second mounting plate 51, the extended heat conducting plate 52 and the second connecting sleeve 53 are of an integrally formed structure. An irregular groove 12 is formed in the screw barrel 1 on one side below each heating coil 2. The second mounting plate 51 and the extended heat conducting plate 52 are embedded in the irregular groove 12, and the extended heat conducting plate 52 is located inside the corresponding heating coil 2. Thus, the temperature of the heating coil 2 can be thermally conducted to the inside of the second connecting sleeve 53 through the extended heat conducting plate 52 to facilitate the temperature detection of the second thermocouple 6. And the second mounting plate 51 is fixedly connected to the irregular groove 12 by screws. The second thermocouple 6 is a compression spring type thermocouple. The temperature detection probe of the second thermocouple 6 extends into the second connecting sleeve 53, and the compression sleeve of the second thermocouple 6 is snap-fitted with the clamping post at the lower opening of the second connecting sleeve 53.

[0025] Working principle: By arranging the inner heat conducting member 3 in the screw barrel 1 on both sides above each heating coil 2 and the first thermocouple 4 installed therein, since the lower end of the lower heat conducting sleeve 31 of the inner heat conducting member 3 can communicate with the inside of the barrel, the temperature in the screw barrel 1 can be thermally conducted to the inside of the lower heat conducting sleeve 31, and the first thermocouple 4 can detect the temperature after thermal conduction in the lower heat conducting sleeve 31. Thus, each first thermocouple 4 can accurately detect the temperature of each section after heating by the heating coil 2 inside the screw barrel 1 of the injection molding machine to facilitate better monitoring of the change in the heating temperature inside the screw barrel 1 of the injection molding machine; by arranging the outward heat conducting member 5 in the screw barrel 1 on one side below each heating coil 2 and the second thermocouple 6 installed therein, since the extended heat conducting plate 52 of the outward heat conducting member 5 extends to the inner side position of the corresponding heating coil 2, the temperature of the heating coil 2 can be thermally conducted to the inside of the second connecting sleeve 53 through the extended heat conducting plate 52, and the second thermocouple 6 can detect the temperature after thermal conduction in the second connecting sleeve 53. Thus, each second thermocouple 6 can accurately detect the heating temperature of the corresponding heating coil 2 to facilitate better monitoring of the heating condition of each heating coil 2.

[0026] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that without departing from the spirit and scope defined by the claims of the present application, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features.

Claims

1. A temperature detection device for a heater of an injection molding machine, the injection molding machine comprising a screw barrel (1) and a plurality of heating rings (2) sleeved on the outer surface of the screw barrel (1), wherein two adjacent heating rings (2) are distributed with a gap, characterized in that: The screw barrel (1) is provided with internal heat-conducting parts (3) on both sides of the upper part of each heating ring (2), and an internal heat-conducting part (3) is provided at the gap position between each adjacent two heating rings (2). The lower end of each internal heat-conducting part (3) is connected to the screw barrel (1), and a first thermocouple (4) is provided in each internal heat-conducting part (3). The screw barrel (1) is provided with external heat-conducting parts (5) on one side of the lower part of each heating ring (2), and each external heat-conducting part (5) extends to the inner side of the corresponding heating ring (2), and a second thermocouple (6) is provided in each external heat-conducting part (5). The two adjacent heating rings (2) are provided close to the corresponding internal heat-conducting parts (3) and the external heat-conducting parts (5).

2. A temperature detection device for a heater of an injection molding machine according to claim 1, characterized in that: The heat-conducting member (3) in the barrel comprises a lower heat-conducting sleeve (31), a first mounting plate (32) and a first connecting sleeve (33); the top of the lower heat-conducting sleeve (31) is fixedly connected to the bottom of the first mounting plate (32); the top of the first mounting plate (32) is fixedly connected to the bottom of the first connecting sleeve (33); the lower heat-conducting sleeve (31), the first mounting plate (32) and the first connecting sleeve (33) are an integrally formed structure; the lower heat-conducting sleeve (31), the first mounting plate (32) and the first connecting sleeve (33) are internally connected; the screw barrel (1) is provided with strip grooves (7) on both sides of the upper part of each heating coil (2); and a gap between each adjacent two heating coils (2) is provided. The first mounting plate (32) is embedded in the strip groove (7) and fixedly connected with the first thermocouple (4). The temperature detection probe of the first thermocouple (4) extends from the first connecting sleeve (33) into the lower heat-conducting sleeve (31), and the first thermocouple (4) is snap-fitted with the upper opening of the first connecting sleeve (33).

3. A temperature detection device for a heater of an injection molding machine according to claim 2, characterized in that: The lower end of the mounting hole (8) is an inverted truncated cone structure, and the lower end of the lower heat-conducting sleeve (31) is correspondingly an inverted truncated cone structure, a high-temperature resistant sealing gasket (9) is arranged between the first mounting plate (32) and the strip-shaped groove (7), a high-temperature resistant sealing glue (10) is arranged between the outer wall of the lower heat-conducting sleeve (31) and the inner wall of the mounting hole (8), and a through hole (11) is penetrated through the first mounting plate (32), and the through hole (11) is connected to the outer wall of the lower heat-conducting sleeve (31).

4. A temperature detection device for a heater of an injection molding machine according to claim 2, characterized in that: The external heat conducting member (5) comprises a second mounting plate (51), an extended heat conducting plate (52) and a second connecting sleeve (53); the top of the second connecting sleeve (53) is fixedly connected to the second mounting plate (51); the extended heat conducting plate (52) is fixedly provided on one side of the second mounting plate (51); the second mounting plate (51), the extended heat conducting plate (52) and the second connecting sleeve (53) are an integrally formed structure; and a special-shaped recess is provided on the screw barrel (1) at one side of the lower part of each heating coil (2). The second mounting plate (51) and the extended heat-conducting plate (52) are embedded in the special-shaped groove (12), and the extended heat-conducting plate (52) is located at the inner side of the corresponding heating ring (2), and the second mounting plate (51) is fixedly connected to the special-shaped groove (12) by screws, and the temperature detection probe of the second thermocouple (6) extends into the second connecting sleeve (53), and the second thermocouple (6) is snap-fitted and connected to the lower opening of the second connecting sleeve (53).

5. A temperature detection device for a heater of an injection molding machine according to claim 4, characterized in that: The inner heat-conducting member (3) of the barrel and the outer heat-conducting member (5) are made of boron nitride ceramic material.

6. A temperature detection device for a heater of an injection molding machine according to claim 4, characterized in that: The first thermocouple (4) and the second thermocouple (6) are both compression spring type thermocouples.

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