Temperature measuring structure of extruder

Abstract

The utility model relates to the technical field of extruders, in particular to a temperature measuring structure of an extruder, which comprises a temperature measuring sensor, a casing and a neck bush assembled in the casing, the temperature measuring sensor comprises an extension rod, the end part of the extension rod is provided with a temperature measuring probe, the casing is provided with a first mounting hole, and the neck bush is provided with a second mounting hole. The inner bushing is provided with a second mounting hole which is coaxial with the first mounting hole and is a blind hole, the temperature measurement sensor is fixed with the first mounting hole, a sealed gap is arranged between the extension rod and the second mounting hole, the gap is filled with heat conduction oil, and the temperature measurement probe is immersed in the heat conduction oil. Firstly, the temperature measurement probe is completely immersed in the heat conduction oil, the contact surface of the heat conduction oil and the neck bush is large, so that the temperature surface obtained by the temperature measurement probe is larger, the temperature measurement is more accurate, and secondly, as the temperature measurement probe is not in direct contact with the neck bush and the shell, the problem that the temperature measurement probe is extruded and damaged due to installation errors or use errors is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a temperature measuring structure of an extruder. Background Art

[0002] At present, twin-screw extruders have been widely used in the field of polymer processing. Hard polyvinyl chloride pellets, pipes, profiles, and plates are almost all processed and formed by twin-screw extruders. As a continuous mixer, twin-screw extruders have been widely used for polymer blending, filling, and reinforcement modification, and are also used for reactive extrusion. Twin-screw extruders are mainly composed of several parts such as transmission device, feeding device, barrel and screw.

[0003] At present, the barrel of the parallel twin-screw granulator on the market adopts a casing plus an inner sleeve assembly structure. During the production process, due to the assembly gap between the inner sleeve and the casing, and between the probe and the casing, there is a large heat transfer loss and a large temperature gradient between the casing and the inner sleeve when the barrel is heated. The existing barrel temperature probe is installed on the casing, and the temperature probe cannot accurately measure the temperature of the inner wall of the liner. Utility Model Content

[0004] The utility model aims to solve the defect of inaccurate temperature measurement of the extruder in the prior art and proposes a temperature measurement structure for the extruder.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A temperature measuring structure for an extruder comprises a temperature sensor, a casing, and an inner sleeve assembled in the casing, wherein the temperature sensor comprises an extension rod, the end of the extension rod has a temperature measuring probe, the casing is provided with a first mounting hole, the inner sleeve is provided with a second mounting hole which is coaxial with the first mounting hole and is a blind hole, the temperature sensor is fixed to the first mounting hole, a sealed gap is provided between the extension rod and the second mounting hole, the gap is filled with heat transfer oil, and the temperature measuring probe is immersed in the heat transfer oil.

[0007] The temperature measuring structure comprises a sleeve, the sleeve is sleeved on the outer circumference of the extension rod, the sleeve is sealed with the extension rod, and the sleeve is sealed with the second mounting hole.

[0008] The outer circumference of the sleeve has an external thread, and the end of the second mounting hole close to the opening has an internal thread wall. The sleeve is threadedly connected to the second mounting hole, and the inner circumferential wall of the sleeve is tangent to the outer circumferential wall of the extension rod.

[0009] The end of the sleeve away from the second mounting hole is threadedly connected with a pressure cover, the pressure cover has a groove cavity, the groove cavity has a conical wall, a second sealing ring is arranged in the groove cavity, the second sealing ring part abuts against the conical wall, the second sealing ring part abuts against the outer circumference of the extension rod, and the second sealing ring part abuts against the end face of the sleeve.

[0010] An annular groove is formed on the inner circumferential wall of the sleeve, a first sealing ring is embedded in the annular groove, and the inner circumference of the first sealing ring abuts against the outer circumference of the extension rod.

[0011] The first mounting hole is a threaded through hole, and the temperature measuring sensor is threadedly connected to the first mounting hole.

[0012] The temperature measuring sensor is a thermocouple sensor or a resistance temperature sensor.

[0013] The heat transfer oil is aromatic hydrocarbon-based heat transfer oil or synthetic oil-based heat transfer oil.

[0014] The utility model proposes a temperature measuring structure for an extruder, which has the following beneficial effects: firstly, the temperature measuring probe is completely immersed in the heat transfer oil, and the contact surface between the heat transfer oil and the inner liner is relatively large, so the temperature surface obtained by the temperature measuring probe is larger and the temperature measurement is more accurate; secondly, since the temperature measuring probe has no direct contact with the inner liner and the casing, the problem of the temperature measuring probe being squeezed and damaged due to installation errors or use errors is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] In the figure: casing 1, inner sleeve 2, first mounting hole 3, second mounting hole 4, temperature sensor 5, extension rod 6, temperature probe 7, sleeve 8, gland 9, conical wall 10, groove cavity 11, first sealing ring 12, gap 13, internal thread wall 14. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] Reference Figure 1A temperature measuring structure of an extruder includes a temperature sensor 5, a casing 1, and an inner sleeve 2 assembled in the casing 1. A material 15 is heated in the inner sleeve 2. The temperature sensor 5 includes an extension rod 6, and a temperature probe 7 is provided at the end of the extension rod 6. The casing 1 is provided with a first mounting hole 3, and the inner sleeve 2 is provided with a second mounting hole 4 which is coaxial with the first mounting hole 3 and is a blind hole. The temperature sensor 5 is fixed to the first mounting hole 3, and a sealed gap 13 is provided between the extension rod 6 and the second mounting hole 4. The gap 13 is filled with heat transfer oil, and the temperature probe 7 is immersed in the heat transfer oil.

[0019] refer to Figure 1 , the device extends the temperature probe 7 into the second mounting hole 4 of the inner sleeve 2. A gap 13 is set between the second mounting hole 4 and the temperature probe 7, and the gap 13 is filled with heat transfer oil, so that the temperature probe 7 is immersed in the heat transfer oil. This method has the following advantages. First, the temperature probe 7 is completely immersed in the heat transfer oil, and the contact surface between the heat transfer oil and the inner sleeve 2 is relatively large, so the temperature surface obtained by the temperature probe 7 is larger and the temperature measurement is more accurate. Secondly, since the temperature probe 7 is not in direct contact with the inner sleeve 2 and the housing 1, the problem of the temperature probe 7 being squeezed and damaged due to installation errors or usage errors is solved.

[0020] A gap that is too thick will affect the corresponding speed of temperature measurement, so as an implementation method, the thickness of the gap 13 is controlled to be 0.5-1 mm.

[0021] The temperature sensor is a thermocouple sensor or a resistance temperature sensor; the heat transfer oil is an aromatic hydrocarbon-based heat transfer oil or a synthetic oil-based heat transfer oil.

[0022] As a sealing method, the temperature measuring structure includes a sleeve 8, which is sleeved on the outer circumference of the extension rod 6. The sleeve 8 and the extension rod 6 are sealed, and the sleeve 8 and the second mounting hole 4 are sealed. The extension rod 6 and the second mounting hole 4 are sealed by using the sleeve 8 as an intermediate piece.

[0023] As an implementation mode, the outer circumference of the sleeve 8 has an external thread, and the second mounting hole 4 has an internal threaded wall 14 at the end close to the opening. The sleeve 8 is threadedly connected to the second mounting hole 4, and the inner circumferential wall of the sleeve 8 is tangent to the outer circumferential wall of the extension rod 6. The sleeve 8 is sealed with the second mounting hole 4 by means of threads. The sleeve 8 is sealed with the outer circumferential wall of the extension rod 6 by tangency, and is not directly sealed by a sealing ring. The reason is that if the sealing ring is in direct contact with the high-temperature heat transfer oil for a long time, its life is relatively short.

[0024] In order to further improve the sealing effect, the end of the sleeve 8 away from the second mounting hole 4 is threadedly connected with a pressure cap 9, the pressure cap 9 has a groove cavity 11, the groove cavity 11 has a conical wall 10, and a second sealing ring 16 is arranged in the groove cavity 11, the second sealing ring 16 partly abuts against the conical wall 10, the second sealing ring 16 partly abuts against the outer circumference of the extension rod 6, and the second sealing ring 16 partly abuts against the end face of the sleeve 8, and the pressure cap 9 is installed at the end of the sleeve 8 away from the heat transfer oil, and the second sealing ring 16 is pressed tightly between the sleeve 8 and the outer circumferential wall of the extension rod 6 through the pressure cap. When the sealing mode of the tangent of the sleeve 8 and the outer circumferential wall of the extension rod 6 fails, the second sealing ring 16 can be used as a secondary seal, and the second sealing ring 16 is away from the heat transfer oil to avoid the second sealing ring 16 from contacting the heat transfer oil for a long time. If the heat transfer oil passes through the tangent surface between the sleeve 8 and the extension rod 6, the temperature will also be reduced to a certain extent, so the service life of the second sealing ring 16 can be well extended.

[0025] Furthermore, the sleeve 8 is made of a material with a low thermal conductivity.

[0026] In order to further improve the sealing effect, an annular groove is formed on the inner circumferential wall of the sleeve 8, and a first sealing ring 12 is embedded in the annular groove. The inner circumference of the first sealing ring 12 abuts against the outer circumference of the extension rod 6, and the first sealing ring 12 also serves as a sealing means.

[0027] The first mounting hole is a threaded through hole, and the temperature sensor is threadedly connected to the first mounting hole. This assembly method is relatively common and will not be described in detail.

[0028] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technical solution, concept, and design obtained by equivalent replacement or change based on the technical solution and utility model concept of the utility model by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model.

Claims

1. A temperature measurement structure for an extruder, comprising a temperature sensor (5), a housing (1), and an inner sleeve (2) assembled in the housing (1), wherein the temperature sensor (5) comprises an extension rod (6), and the end of the extension rod (6) has a temperature probe (7), characterized in that: The housing (1) is provided with a first mounting hole (3), the inner sleeve (2) is provided with a second mounting hole (4) which is coaxial with the first mounting hole (3) and is a blind hole, the temperature sensor (5) is fixed to the first mounting hole (3), a sealed gap (13) is provided between the extension rod (6) and the second mounting hole (4), the gap (13) is filled with heat transfer oil, and the temperature probe (7) is immersed in the heat transfer oil.

2. The extruder temperature measurement structure according to claim 1, characterized in that: The temperature measuring structure comprises a sleeve (8), the sleeve (8) is sleeved on the outer circumference of the extension rod (6), the sleeve (8) and the extension rod (6) are sealed, and the sleeve (8) and the second mounting hole (4) are sealed.

3. An extruder temperature measurement structure according to claim 2, characterized in that: The outer circumference of the sleeve (8) has an external thread, and the end of the second mounting hole (4) close to the opening has an internal thread wall (14). The sleeve (8) is threadedly connected to the second mounting hole (4), and the inner circumferential wall of the sleeve (8) is tangent to the outer circumferential wall of the extension rod (6).

4. The extruder temperature measurement structure according to claim 3, characterized in that: The end of the sleeve (8) away from the second mounting hole (4) is threadedly connected to a pressure cover (9), the pressure cover (9) has a groove cavity (11), the groove cavity (11) has a conical wall (10), a second sealing ring (16) is arranged in the groove cavity (11), the second sealing ring (16) partly abuts against the conical wall (10), the second sealing ring (16) partly abuts against the outer circumference of the extension rod (6), and the second sealing ring (16) partly abuts against the end face of the sleeve (8).

5. An extruder temperature measurement structure according to claim 3 or 4, characterized in that: An annular groove is formed on the inner circumferential wall of the sleeve (8), a first sealing ring (12) is embedded in the annular groove, and the inner circumference of the first sealing ring (12) abuts against the outer circumference of the extension rod (6).

6. An extruder temperature measurement structure according to any one of claims 1 to 4, characterized in that: The first mounting hole is a threaded through hole, and the temperature measuring sensor is threadedly connected to the first mounting hole.

7. An extruder temperature measurement structure according to any one of claims 1 to 4, characterized in that: The temperature measuring sensor is a thermocouple sensor or a resistance temperature sensor.

8. An extruder temperature measurement structure according to any one of claims 1 to 4, characterized in that: The heat transfer oil is aromatic hydrocarbon-based heat transfer oil or synthetic oil-based heat transfer oil.

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