Multi-point temperature measurement sheathed thermocouple for zinc impregnation furnace

Abstract

A multi-point temperature measurement armored thermocouple for a zinc impregnation furnace comprises an armored sleeve and a thermocouple wire pair, the armored sleeve is a metal pipe, the wall thickness of the armored sleeve is larger than or equal to 1.5 mm, the armored sleeve is divided into three sections including a shaft pipe section, an end pipe section and a temperature measurement pipe section and is in a Z shape, the temperature measurement pipe section is provided with at least two temperature measurement parts, and the thermocouple wire pair is connected with the shaft pipe section and the end pipe section. The temperature measuring part comprises a hole formed in the temperature measuring pipe section and a protective cap covering the hole, a plurality of groups of thermocouple wire pairs penetrate through the armored sleeve, and a connecting part of each group of thermocouple wire pairs is positioned in the temperature measuring part on the temperature measuring pipe section and is led out from a port of the shaft pipe section. The thermocouple can enter from the rotating shaft of the sealing furnace core, is arranged along the length direction of the inner wall of the zinc impregnation furnace core after being bent, and is used for carrying out multi-point measurement on the temperature nearby the inner wall of the zinc impregnation furnace core, and the armored structure can also prevent the thermocouple from being damaged in the rolling process of workpieces and quartz sand in the furnace core.

Description

Technical Field

[0001] This application relates to the technical field of thermocouples, and specifically relates to a multi-point temperature-measuring armored thermocouple for a zincizing furnace. Background Art

[0002] Powder zincizing is to bury the surface-cleaned workpiece in the furnace core of a zincizing furnace filled with zincizing agent, heat the inside of the zincizing furnace to below the melting point of zinc (419.4 °C), and keep it warm for a certain period of time, so as to form a zincizing layer on the metal surface. At the process temperature, the workpiece to be processed needs to be heated in the sealed furnace core for 4 - 6 hours. During this process, the sealed furnace core is always rotating, and the workpieces in the sealed furnace core are in a state of rolling and rubbing against each other. Since the heating of the zincizing furnace is external heating, the heater is outside the sealed furnace core. When heating, the wall of the sealed furnace core is heated first, and then the heat is transferred to the workpieces in the drum. During the heating process, the temperature of the furnace wall is always the highest.

[0003] Traditional temperature measurement of zincizing furnaces uses ordinary armored thermocouples, which are inserted into the inside of the sealed furnace core from the rotating shaft of the sealed furnace core for temperature measurement, rather than measuring the temperature near the furnace wall, and can only measure the temperature of one point. The temperature value measured by this measurement method is on the low side, while the actual temperature, especially the temperature of the furnace wall, may be very high, exceeding the melting point of zinc, and the zinc powder will be melted, forming zinc nodules on the surface of the workpiece, and seriously scrapping the product in severe cases.

[0004] Therefore, it is crucial to accurately measure the temperature near the inner wall of the zincizing furnace core. Summary of the Utility Model

[0005] This application provides a multi-point temperature-measuring armored thermocouple for a zincizing furnace, which can enter from the rotating shaft of the sealed furnace core, be bent and arranged along the longitudinal direction of the inner wall of the zincizing furnace core, perform multi-point temperature measurement on the temperature near the inner wall of the zincizing furnace core, and the armored structure can also prevent damage to the thermocouple during the rolling process of the workpieces and quartz sand in the furnace core.

[0006] To achieve the above object, the technical solution adopted by the utility model is:

[0007] According to one aspect of the present application, an embodiment provides a multi-point temperature measuring armored thermocouple for a zincizing furnace, comprising an armored sleeve and a thermocouple wire pair, wherein the armored sleeve is a metal tube with a wall thickness ≥1.5 mm, and the armored sleeve is divided into three sections, including an axial tube section, an end tube section and a temperature measuring tube section, in a Z shape, and the temperature measuring tube section is provided with no less than two temperature measuring parts, and the temperature measuring part comprises a hole opened on the temperature measuring tube section and a protective cap covering the hole, and a plurality of groups of thermocouple wire pairs are passed through the armored sleeve, and the connecting part of each group of thermocouple wire pairs is located in the temperature measuring part on the temperature measuring tube section, and is led out from the port of the axial tube section. In actual use, the axial tube section of the armored sleeve is passed through the core shaft of the zincizing furnace, the end tube section is arranged on the inner wall of the end of the zincizing furnace core, and the temperature measuring tube section is arranged on the side wall of the zincizing furnace core.

[0008] In some embodiments, the end pipe section and the temperature measuring pipe section in the armored casing are two half-pipes buckled together to form a tube, which is convenient for replacing a new thermocouple wire when the thermocouple wire burns out.

[0009] In some embodiments, when there are more than three temperature measuring parts on the temperature measuring pipe section in the armored casing, the temperature measuring parts are arranged at equal intervals.

[0010] In some embodiments, the number of thermocouple wire pairs in the armored casing is equal to the number of temperature measuring parts on the temperature measuring pipe section, and each temperature measuring part has a connecting part of a thermocouple wire pair.

[0011] In some embodiments, the number of thermocouple wire pairs in the armored sleeve is twice the number of temperature measuring parts, and each temperature measuring part has two connecting parts of thermocouple wire pairs. In actual use, one thermocouple wire pair is used and the other is spare.

[0012] In some embodiments, the thermocouple wire pair is coated with a high temperature resistant insulating coating.

[0013] In some embodiments, the high temperature resistant insulating coating is a polysilazane coating with a thickness of less than 0.5 mm.

[0014] In some embodiments, the thermocouple wire pair is a K-type thermocouple.

[0015] The beneficial effects of the utility model are:

[0016] The utility model discloses a multi-point temperature measuring armored thermocouple for a shearing furnace. The armored sleeve is made of metal, has a wall thickness of ≥1.5mm, has high strength, and can withstand the collision of workpieces during the shearing process without rapid damage.

[0017] The utility model discloses a multi-point temperature measuring armored thermocouple for a zincizing furnace. The temperature measuring pipe section is provided with no less than two temperature measuring parts, which can realize temperature measurement at no less than two points and improve the temperature measurement accuracy.

[0018] A multi-point temperature-measuring armored thermocouple for a zinc permeation furnace of the utility model has a heat-resistant insulating coating coated on the thermocouple wires, which can avoid the signals between multiple thermocouple wire pairs from being connected in series with each other, generating interference, and improving the accuracy of temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the utility model;

[0020] Figure 2 is a schematic diagram of the utility model used for a zinc permeation furnace.

[0021] In the figure: 1, armored sleeve; 11, shaft tube section; 12, end tube section; 13, temperature-measuring tube section; 2, thermocouple wire pair; 3, temperature-measuring part; 31, hole; 32, protective cap; 4, furnace core shaft; 5, furnace core side wall. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further details the present application in conjunction with the drawings through specific embodiments. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many details are described to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid the core part of the present application from being overwhelmed by excessive description. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the field.

[0023] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various embodiments, and the operation steps involved in each embodiment can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are essential components and / or sequences.

[0024] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling). Embodiment

[0025] Please refer to Figure 1 and Figure 2According to one aspect of the present application, an embodiment provides a multi-point temperature measurement armored thermocouple for a zincizing furnace, comprising an armored sleeve 1 and a thermocouple wire pair 2, wherein the armored sleeve 1 is a steel pipe with a diameter of 25 mm and a wall thickness of 2 mm, and the thermocouple wire pair 2 is a K-type thermocouple with a diameter of 1.5 mm and a temperature measurement range of 0-1200°C. The thermocouple wire pair 2 is coated with a high-temperature resistant insulating coating, which is a polysilazane coating with a thickness of 0.2 mm. The armored casing 1 is divided into three sections, including an axial tube section 11, an end tube section 12 and a temperature measuring tube section 13, which are in a Z shape. Three temperature measuring parts 3 are arranged on the temperature measuring tube section 13, which are respectively located at the two ends and the middle of the temperature measuring tube section 13. The temperature measuring part 3 includes a hole 31 opened on the temperature measuring tube section 13 and a protective cap 32 covering the hole 31. Three groups of thermocouple wire pairs 2 are passed through the armored casing 1. The connecting part 13 of each group of thermocouple wire pairs 2 is correspondingly located in the temperature measuring part 3 on the temperature measuring tube section and is led out from the port of the axial tube section 11. In actual use, the axial tube section 11 of the armored casing 1 is passed through the core shaft 4 of the zincizing furnace, the end tube section is arranged on the inner wall of the end of the zincizing furnace core, and the temperature measuring tube section is arranged on the side wall 5 of the zincizing furnace core.

[0026] The thermocouple wire is coated with a polysilazane coating, which is an organic polysilazane coating, such as vinyl polysilazane. Polysilazane has good electrical insulation and high temperature resistance. It can be ceramicized at high temperature to form silicon ceramics, and silicon ceramics still have good electrical insulation. Although the temperature of zinc infiltration is not high, the polysilazane coating will not be ceramicized, has good electrical insulation, and is not afraid of high temperatures, and can be used for a long time.

[0027] After the thermocouple wire is coated with polysilazane coating, there is no need to fill other insulating materials in the armored pipe, so that the signals between each group of thermocouple wire pairs will not interfere with each other, and accurate temperature measurement of multiple points in the same pipe can be achieved. Example

[0028] According to one aspect of the present application, an embodiment provides a multi-point temperature measuring armored thermocouple for a zincizing furnace, comprising an armored sleeve 1 and a thermocouple wire pair 2, wherein the thermocouple wire pair 2 is a K-type thermocouple, the diameter of the thermocouple wire is 1.5 mm, and the temperature measuring range is 0-1200°C. The thermocouple wire pair 2 is coated with a high temperature resistant insulating coating, and the high temperature resistant insulating coating is a polysilazane coating with a thickness of 0.2 mm. The armored sleeve 1 is a steel pipe with a diameter of 25 mm and a wall thickness of 2 mm. The armored sleeve 1 is divided into three sections, including an axial pipe section 11, an end pipe section 12 and a temperature measuring pipe section 13, which are in a Z shape, wherein the end pipe section 12 and the temperature measuring pipe section 13 are two half pipes buckled together to form a pipe, so that when the thermocouple wire is burned out, a new thermocouple wire pair 2 can be replaced. In actual use, after the two half pipes are buckled together, they need to be tightened with a pipe clamp or iron wire.

[0029] The temperature measuring tube section 13 is provided with three temperature measuring parts 3, which are respectively located at the two ends and the middle of the temperature measuring tube section 13. The temperature measuring part 3 includes a hole 31 opened on the temperature measuring tube section 13 and a protective cap 32 covering the hole 31. Six groups of thermocouple wire pairs 2 are inserted into the armored casing 1. The connecting parts of every two groups of thermocouple wire pairs 2 are correspondingly located in the temperature measuring part 3 on the temperature measuring tube section 13 and are led out from the port of the shaft tube section 11. In actual use, the shaft tube section 11 of the armored casing 1 is inserted into the core shaft 4 of the zincizing furnace, the end tube section 12 is arranged on the inner wall of the end of the zincizing furnace core, and the temperature measuring tube section 13 is arranged on the side wall 5 of the zincizing furnace core. The two groups of thermocouple wire pairs 2 in the same temperature measuring part are used as one group and spare as one group. In the process of zincizing, if the used group is suddenly burned out, it can be connected to the other group in time to achieve uninterrupted temperature measurement, thereby ensuring the accuracy of zincizing.

[0030] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of the present invention.

Claims

1. A multi-point temperature-measuring armored thermocouple for a zincizing furnace, characterized in that: It includes an armored sleeve and thermocouple wire pairs. The armored sleeve is a metal tube with a wall thickness of ≥1.5mm. The armored sleeve is divided into three sections, including an axis tube section, an end tube section and a temperature measuring tube section, in a Z shape. No less than two temperature measuring parts are arranged on the temperature measuring tube section. The temperature measuring part includes a hole opened on the temperature measuring tube section and a protective cap covering the hole. Several groups of thermocouple wire pairs are passed through the armored sleeve. The connecting part of each group of thermocouple wire pairs is located in the temperature measuring part on the temperature measuring tube section and is led out from the port of the axis tube section.

2. A multi-point temperature-measuring armored thermocouple for a zinc permeation furnace according to claim 1, characterized in that: The end pipe section and the temperature measuring pipe section in the armored casing are two half pipes buckled together to form a pipe.

3. A multi-point temperature-measuring armored thermocouple for a zincizing furnace according to claim 1, characterized in that: When there are more than three temperature measuring parts on the temperature measuring pipe section in the armored casing, the temperature measuring parts are arranged at equal intervals.

4. A multi-point temperature-measuring sheathed thermocouple for a zinc permeation furnace according to claim 1, characterized in that: The number of thermocouple wire pairs in the armored casing is equal to the number of temperature measuring parts on the temperature measuring pipe section, and each temperature measuring part has a connecting part of a thermocouple wire pair.

5. A multi-point temperature-measuring sheathed thermocouple for a zincizing furnace according to claim 1, characterized in that: The number of thermocouple wire pairs in the armored sleeve is twice the number of the temperature measuring parts, and each temperature measuring part has two groups of connecting parts of the thermocouple wire pairs.

6. A multi-point temperature-measuring sheathed thermocouple for a zinc permeation furnace according to claim 1, characterized in that: The thermocouple wire pair is coated with a high temperature resistant insulating coating.

7. A multi-point temperature measuring sheathed thermocouple for a zincizing furnace according to claim 6, characterized in that: The high temperature resistant insulating coating is a polysilazane coating with a thickness of less than 0.5 mm.

8. A multi-point temperature-measuring armored thermocouple for a zinc permeation furnace according to claim 1, characterized in that: The thermocouple wire pair is a K-type thermocouple.

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