阅读说明：本技术 一种热电偶加工工艺 (Thermocouple processing technology ) 是由 张明 章书周 卢洋 马克 于 2021-02-02 设计创作，主要内容包括：本发明公开了一种热电偶加工工艺,包括以下步骤,对补偿导线进行加工：取用直径为1.0-1.4mm的Cu-0.5%Ni合金丝备用作为补偿导线；取用直径20mm的钢管备用；选用氧化镁含量≥96％的氧化镁柱备用；将补偿导线将按钢管长度的1.3倍进行下料,对补偿导线进行冷拔,将其拉拔到直径0.86-1.22mm之间,并对其进行200℃-650℃的退火；对退火后的补偿导线进行电阻率测定,本发明确定了采用合理热加工工艺,能够对热电偶的补偿导线性能进行可控调节,从而增加了热电偶检测精度。(The invention discloses a thermocouple processing technology, which comprises the following steps of processing a compensation lead: taking a Cu-0.5% Ni alloy wire with the diameter of 1.0-1.4mm as a compensation lead for later use; taking a steel pipe with the diameter of 20mm for standby; selecting a magnesium oxide column with the magnesium oxide content of more than or equal to 96 percent for standby; blanking the compensating lead according to 1.3 times of the length of the steel pipe, cold-drawing the compensating lead to the diameter of 0.86-1.22mm, and annealing the compensating lead at 200-650 ℃; the invention determines to adopt a reasonable hot processing technology to controllably adjust the performance of the compensation lead of the thermocouple, thereby increasing the detection precision of the thermocouple.)

1. A thermocouple processing technology is characterized by comprising the following steps of processing a compensation lead:

taking a Cu-0.5% Ni alloy wire with the diameter of 1.0-1.4mm as a compensation lead for later use;

taking a steel pipe with the diameter of 20mm for standby;

selecting a magnesium oxide column with the magnesium oxide content of more than or equal to 96 percent for standby;

blanking the compensating lead according to 1.3 times of the length of the steel pipe, cold-drawing the compensating lead to the diameter of 0.86-1.22mm, and annealing the compensating lead at 200-650 ℃;

measuring the resistivity of the annealed compensation wire;

and (3) penetrating the compensation lead into the corresponding magnesium oxide column, and ensuring that the positive and negative electrodes are exposed at the front end of the steel pipe after the magnesium oxide column penetrates into the steel pipe.

2. The thermocouple processing technology according to claim 1, wherein the annealing step of the compensation lead specifically comprises: and (3) putting the compensating lead into an annealing furnace, raising the temperature of the annealing furnace to 200-650 ℃, and sending ammonia decomposition and purification gas into an annealing furnace tube.

3. The thermocouple processing technique according to claim 2, characterized in that: and the compensation lead is polished by a polishing machine for 2-3 times, the anode and the cathode of the compensation lead and the anode and the cathode of the armor wire are welded into a whole by a laser welding machine, and the anode and the cathode are separated by an insulating tube.

4. The thermocouple processing technique according to claim 1, characterized in that: and the outer part of the steel pipe is treated by spraying a wear-resistant layer.

5. The thermocouple processing technique according to claim 4, wherein: the wear-resistant layer is a tungsten carbide alloy coating.

6. The thermocouple processing technique according to claim 5, characterized in that: the steel pipe is of an alloy steel structure.

7. The thermocouple processing technique according to claim 6, wherein: and a nickel alloy is arranged between the steel pipe and the magnesium oxide column, and the joint of the nickel alloy and the steel pipe is welded and fixed.

8. The thermocouple processing technique according to claim 7, wherein: before the magnesium oxide column penetrates into the steel pipe, the steel pipe is cleaned through alcohol, the cleaned steel pipe is washed through dichloromethane gas, and the washed steel pipe is subjected to high-temperature drying and disinfection through a drying furnace and then subjected to a nickel alloy welding step.

Technical Field

The invention relates to the technical field of thermocouples, in particular to a thermocouple processing technology.

Background

The thermocouple is a commonly used temperature measuring element in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermal electromotive force signal, converts the thermal electromotive force signal into the temperature of a measured medium through an electric instrument, the shapes of various thermocouples are quite different according to requirements, but the basic structures of the thermocouples are almost the same, the thermocouples are usually composed of main parts such as thermocouple wires, junction boxes and the like, and are usually matched with a display instrument, a recording instrument and an electronic regulator for use.

The traditional thermocouple has the defects of thick relative diameter of a compensating lead and large resistance due to the shortage of the technology, so that the detection reaction is slow in the actual measurement.

Disclosure of Invention

The invention aims to provide a thermocouple processing technology.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a thermocouple processing technology comprises the following steps of processing a compensation lead:

taking a Cu-0.5% Ni alloy wire with the diameter of 1.0-1.4mm as a compensation lead for later use;

taking a steel pipe with the diameter of 20mm for standby;

selecting a magnesium oxide column with the magnesium oxide content of more than or equal to 96 percent for standby;

blanking the compensating lead according to 1.3 times of the length of the steel pipe, cold-drawing the compensating lead to the diameter of 0.86-1.22mm, and annealing the compensating lead at 200-650 ℃;

measuring the resistivity of the annealed compensation wire;

and (3) penetrating the compensation lead into the corresponding magnesium oxide column, and ensuring that the positive and negative electrodes are exposed at the front end of the steel pipe after the magnesium oxide column penetrates into the steel pipe.

Preferably, the annealing step of the compensation conductor is specifically: and (3) putting the compensating lead into an annealing furnace, raising the temperature of the annealing furnace to 200-650 ℃, and sending ammonia decomposition and purification gas into an annealing furnace tube.

Preferably, the compensation lead is polished by a polishing machine for 2-3 times, the positive and negative electrodes of the compensation lead and the positive and negative electrodes of the armor wires are welded into a whole by a laser welding machine, and then the positive and negative electrodes are separated by an insulating tube.

Preferably, the outer part of the steel pipe is treated by spraying a wear-resistant layer.

Preferably, the wear resistant layer is a tungsten carbide alloy coating.

Preferably, the steel pipe is an alloy steel structure.

Preferably, a nickel alloy is arranged between the steel pipe and the magnesium oxide column, and the joint of the nickel alloy and the steel pipe is welded and fixed.

Preferably, before the magnesium oxide column penetrates into the steel pipe, the steel pipe is cleaned by alcohol, the cleaned steel pipe is cleaned by dichloromethane gas, and the cleaned steel pipe is dried and sterilized at high temperature in a drying furnace and then welded with the nickel alloy.

Compared with the prior art, the invention has the advantages that:

the invention ensures that the performance of the compensation lead of the thermocouple can be controllably adjusted by adopting a reasonable hot processing technology, thereby increasing the detection precision of the thermocouple.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a table of resistance changes for a compensated conductor resistance anneal according to the present invention;

FIG. 2 is a table of grain size variations for the compensated wire anneal of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.

The invention provides a thermocouple processing technology, which comprises the following steps,

example one

Processing the compensation wire:

taking a Cu-0.5% Ni alloy wire with the diameter of 1.0mm for later use as a compensation lead;

taking a steel pipe with the diameter of 20mm for standby;

selecting a magnesium oxide column with the magnesium oxide content of more than or equal to 96 percent for standby;

blanking the compensating lead according to 1.3 times of the length of the steel pipe, cold-drawing the compensating lead to a diameter of 0.86mm, and annealing the compensating lead at 300 ℃;

measuring the resistivity of the annealed compensation wire;

and (3) penetrating the compensation lead into the corresponding magnesium oxide column, and ensuring that the positive and negative electrodes are exposed at the front end of the steel pipe after the magnesium oxide column penetrates into the steel pipe.

Specifically, the annealing step of the compensation wire specifically comprises the following steps: and (3) putting the compensating lead into an annealing furnace, raising the temperature of the annealing furnace to 300 ℃, and sending ammonia decomposition and purification gas into an annealing furnace tube.

In this embodiment, the compensation wire is polished with a polishing machine for 2 times by using a non-woven fabric, and then the positive and negative electrodes of the compensation wire and the positive and negative electrodes of the armor wire are welded together by using a laser welding machine, and then the positive and negative electrodes are separated by using an insulating tube.

Example II,

Processing the compensation wire:

taking a Cu-0.5% Ni alloy wire with the diameter of 1.2mm for later use as a compensation lead;

taking a steel pipe with the diameter of 20mm for standby;

selecting a magnesium oxide column with the magnesium oxide content of more than or equal to 96 percent for standby;

blanking the compensating lead according to 1.3 times of the length of the steel pipe, cold-drawing the compensating lead to a diameter of 1.06mm, and annealing the compensating lead at 500 ℃;

measuring the resistivity of the annealed compensation wire;

and (3) penetrating the compensation lead into the corresponding magnesium oxide column, and ensuring that the positive and negative electrodes are exposed at the front end of the steel pipe after the magnesium oxide column penetrates into the steel pipe.

In this embodiment, the annealing step of the compensation wire specifically includes: and (3) putting the compensating lead into an annealing furnace, raising the temperature of the annealing furnace to 500 ℃, and sending ammonia decomposition and purification gas into an annealing furnace tube.

In this embodiment, the compensation wire is polished with a polishing machine for 3 times by using a non-woven fabric, and then the positive and negative electrodes of the compensation wire and the positive and negative electrodes of the armor wire are welded together by using a laser welding machine, and then the positive and negative electrodes are separated by using an insulating tube.

Example III,

Processing the compensation wire:

taking a Cu-0.5% Ni alloy wire with the diameter of 1.4mm for later use as a compensation lead;

taking a steel pipe with the diameter of 20mm for standby;

selecting a magnesium oxide column with the magnesium oxide content of more than or equal to 96 percent for standby;

blanking the compensating lead according to 1.3 times of the length of the steel pipe, cold-drawing the compensating lead to a diameter of 1.22mm, and annealing the compensating lead at 650 ℃;

measuring the resistivity of the annealed compensation wire;

and (3) penetrating the compensation lead into the corresponding magnesium oxide column, and ensuring that the positive and negative electrodes are exposed at the front end of the steel pipe after the magnesium oxide column penetrates into the steel pipe.

In this embodiment, the annealing step of the compensation wire specifically includes: and (3) putting the compensating lead into an annealing furnace, raising the temperature of the annealing furnace to 650 ℃, and sending ammonia decomposition and purification gas into an annealing furnace tube.

In this embodiment, the compensation wire is polished with a polishing machine for 3 times by using a non-woven fabric, and then the positive and negative electrodes of the compensation wire and the positive and negative electrodes of the armor wire are welded together by using a laser welding machine, and then the positive and negative electrodes are separated by using an insulating tube.

Wherein, the outside of the steel pipe is treated by spraying a wear-resistant layer; the wear-resistant layer is a tungsten carbide alloy coating, so that the wear resistance of the steel pipe is improved; the steel pipe is of an alloy steel structure; the nickel alloy is arranged between the steel pipe and the magnesium oxide column, so that the steel pipe can be prevented from being corroded, the structural strength of the steel pipe is improved, and the joint of the nickel alloy and the steel pipe is welded and fixed; before the magnesium oxide column penetrates into the steel pipe, the steel pipe is cleaned through alcohol, the cleaned steel pipe is washed through dichloromethane gas, and the washed steel pipe is subjected to high-temperature drying and disinfection through a drying furnace and then subjected to a nickel alloy welding step.

Referring to fig. 1, as the annealing temperature increases, the resistance of the compensation wire tends to decrease;

referring to fig. 2, as the annealing temperature increases, the grain size becomes larger.

Through the change of the rule, the production of the compensating lead can be controlled, and the precision of the compensating lead can be adjusted.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes or modifications may be made by the patentees within the scope of the appended claims, and within the scope of the invention, as long as they do not exceed the scope of the invention described in the claims.