A device for calibrating thermal resistance or bimetallic thermometer in steel mills

Abstract

The invention discloses a device for calibrating a thermal resistor or a bimetallic thermometer in a steel plant, comprising: a shell, a heating device, which is located at the bottom of a hollow cavity of the shell, a heat-insulating sealing plate, which is located at the upper end of the hollow cavity, a measuring hole is provided on the heat-insulating sealing plate, a measuring cover, which is located above the heat-insulating sealing plate and covers the measuring hole, a plurality of insertion holes are provided on the measuring cover, an insertion tube, which is a tube body with an upper end opening, each insertion tube is used for inserting a thermal resistor or a bimetallic thermometer to be calibrated, so that the thermal resistor or the bimetallic thermometer to be calibrated can be compared with a standard part after being heated, and a support member, which is located beside the insertion tube and on the measuring cover, whose inner wall is in contact with the outer wall of the insertion tube, and assists and keeps the lower end of the insertion tube in a constant temperature solution and does not touch the bottom of the shell; the invention has a simple structure, greatly reduces labor costs, ensures that the lower ends of the thermal resistor to be tested and the standard thermal resistor are on the same horizontal plane, and avoids the occurrence of calibration errors.

Description

Technical Field

[0001] The invention belongs to the field of thermal engineering calibration, and in particular relates to a device for calibrating thermal resistors or bimetallic thermometers in steel plants. Background Art

[0002] The calibration equipment is the main component of the thermal calibration system of the company's steel plant. When calibrating thermistors, the calibrator needs to compare and verify the resistance value of the tested thermistor with that of the standard thermistor to ensure that the metrological performance of the tested thermistor meets the expected standards and reduce the problem of product inconsistency caused by the differences in thermistors.

[0003] Constant temperature oil bath and constant temperature bath are supporting equipment of thermal calibration system, collectively referred to as constant temperature equipment, which are used for the calibration of enterprise temperature measurement equipment, namely thermal resistors, bimetallic thermometers and integrated temperature transmitters, etc. Their main function is to provide a constant temperature field for the calibration process.

[0004] In the prior art, the thermal resistor to be tested and the standard thermal resistor are placed in a constant temperature bath, and the thermal resistor to be tested and the standard thermal resistor are manually grasped so as to be inserted into a glass tube, and then the bottom of the glass tube is placed in the constant temperature bath to ensure that the bottom of the glass tube does not touch the bottom of the constant temperature bath. Due to manual operation, the glass tube is easy to fall into the constant temperature solution, which is troublesome, time-consuming and labor-intensive, and has high labor costs. The heights of the thermal resistor to be tested and the standard thermal resistor inserted into the constant temperature solution are not uniform, which easily causes calibration errors. Summary of the invention

[0005] The purpose of the present invention is to provide a device for calibrating thermal resistors or bimetallic thermometers in steel plants, so as to solve the problem in the prior art that calibration is time-consuming and labor-intensive, and calibration errors are prone to occur.

[0006] The present invention adopts the following technical scheme: a device for calibrating a thermal resistor or a bimetallic thermometer in a steel plant, comprising:

[0007] The shell is a hollow cavity with an opening at the top, which is used to hold a constant temperature solution.

[0008] A heating device is located at the bottom of the hollow cavity of the shell and is used to heat the solution in the hollow cavity.

[0009] The heat-insulating sealing plate is located at the upper end of the hollow cavity, and its edge is fixedly connected to the edge of the hollow cavity to form a sealed cavity with the shell. The heat-insulating sealing plate is provided with a measuring hole.

[0010] The measuring cover is located above the heat preservation sealing plate and covers the measuring hole. The measuring cover is in the same horizontal plane as the heat preservation sealing plate. A plurality of insertion holes are provided on the measuring cover.

[0011] The insertion tube is a tube body with an open upper end, and its lower end is used to be inserted into each insertion hole and inserted into the constant temperature solution so that the constant temperature solution heats it. Each insertion tube is used to insert the thermal resistor or bimetallic thermometer to be calibrated, so that the thermal resistor or bimetallic thermometer to be calibrated can be compared with the standard after being heated.

[0012] The support is located beside the insertion tube and on the measuring cover. Its inner wall is in contact with the outer wall of the insertion tube and assists and keeps the lower end of the insertion tube in the constant temperature solution and does not touch the bottom of the shell.

[0013] Furthermore, the support member is annular and is arranged around the outer wall of the insertion tube.

[0014] Furthermore, the support member is composed of an integrally connected annular upper fitting portion and a gear-shaped lower fitting portion, the upper fitting portion is vertically arranged, and the lower fitting portion is horizontally arranged, the upper fitting portion is arranged around and fits the outer wall of the insertion tube, and the lower fitting portion is arranged around the insertion hole and fits on the measuring cover.

[0015] Furthermore, the upper end of the insertion tube extends out of the insertion hole and is located above the measuring cover.

[0016] Furthermore, the apertures of the insertion tubes are different.

[0017] Furthermore, the upper edge of the upper fitting portion is flush with the upper edge of the insertion tube.

[0018] Furthermore, the material of the insertion tube is glass.

[0019] Furthermore, the solution in the hollow cavity of the shell is water or oil.

[0020] The beneficial effects of the present invention are as follows: the present invention has a simple structure and greatly reduces labor costs. The thermal resistor to be tested and the standard thermal resistor are directly placed in the insertion tube at the same time, and then the height of the insertion tube is predetermined, ensuring that the lower ends of the thermal resistor to be tested and the standard thermal resistor are on the same horizontal plane, avoiding the occurrence of calibration errors, and supporting the insertion tube by setting a support member to avoid the insertion tube falling into the constant temperature solution due to the weight of the thermal resistor to be tested and the standard thermal resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Among them: 1. Shell; 2. Insulation sealing plate; 3. Measuring hole; 4. Measuring cover; 5. Insertion hole; 6. Insertion tube; 7. Support member; 8. Upper fitting part; 9. Lower fitting part. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The present invention discloses a device for calibrating a thermal resistor or a bimetallic thermometer in a steel plant, such as Figure 1 As shown, it includes a shell 1, a heating device, an insulating sealing plate 2, a measuring cover 4, an insertion tube 6, and a support 7. The shell 1 is a hollow cavity with an opening at the top. The hollow cavity is used to hold a constant temperature solution. The solution in the hollow cavity of the shell 1 is water or oil. The heating device is located at the bottom of the hollow cavity of the shell 1, and the heating device is used to heat the solution in the hollow cavity.

[0025] The insulation sealing plate 2 is located at the upper end of the hollow cavity, and the edge of the insulation sealing plate 2 is fixedly connected to the edge of the hollow cavity. The insulation sealing plate 2 is used to form a sealed cavity with the shell 1. A measuring hole 3 is provided on the insulation sealing plate 2. The measuring cover 4 is located above the insulation sealing plate 2 and covers the measuring hole 3. The measuring cover 4 and the insulation sealing plate 2 are in the same horizontal plane, and a plurality of insertion holes 5 are provided on the measuring cover 4.

[0026] The insertion tube 6 is a tube body with an open upper end. The lower end of the insertion tube 6 is used to be inserted into each insertion hole 5, and then inserted into the constant temperature solution so that the constant temperature solution heats it. Each insertion tube 6 is used to insert the thermal resistor or bimetallic thermometer to be calibrated, so that the thermal resistor or bimetallic thermometer to be calibrated can be compared with the standard part after being heated.

[0027] The support member 7 is located beside the insertion tube 6 and on the measuring cover 4. The inner wall of the support member 7 fits the outer wall of the insertion tube 6 and assists and keeps the lower end of the insertion tube 6 in the constant temperature solution and does not touch the bottom of the housing 1.

[0028] During the calibration process, the standard thermal resistor and the thermal resistor to be tested should be inserted into the insertion tube 6 at the same time, and ensure that the measuring ends of the standard thermal resistor and the thermal resistor to be tested are on the same horizontal plane to avoid the influence of the height difference on the calibration result.

[0029] Since the tested thermal resistor and the standard thermal resistor need to be placed vertically in the insertion tube 6 during calibration, and since the insertion tube 6 has been in service for a long time, the tube wall of the insertion tube 6 will be worn to varying degrees. During the calibration process, the insertion tube 6 often falls into the constant temperature solution in the shell 1 due to the weight of the tested thermal resistor itself, which brings great trouble to the calibration work. By providing the support member 7, the horizontal height of the insertion tube 6 can be guaranteed to avoid the occurrence of such problems, and the problem of the insertion tube 6 accidentally falling into the constant temperature solution due to the weight of the tested thermal resistor and the standard thermal resistor themselves during the calibration process is effectively solved, thereby fundamentally solving the technical defects and improving the work efficiency of the inspector.

[0030] The support member 7 is annular and arranged around the outer wall of the insertion tube 6. The support member 7 is composed of an upper annular fitting portion 8 and a gear-shaped lower fitting portion 9 which are connected in one piece. The upper fitting portion 8 is arranged vertically, and the lower fitting portion 9 is arranged horizontally. The upper fitting portion 8 is arranged around and fits the outer wall of the insertion tube 6, and the lower fitting portion 9 is arranged around the insertion hole 5 and fits on the measuring cover 4. There are many methods for fitting, and glue or other methods can be used, as long as the fitting effect can be achieved. Generally, glue is used to bond the inner wall of the upper fitting portion 8 to the outer wall of the insertion tube 6 extending out of the insertion hole 5, and the inner wall of the lower fitting portion 9 is bonded to the outer wall of the measuring cover 4 surrounding the insertion hole 5, and the upper edge of the upper fitting portion 8 is ensured to be flush with the upper edge of the insertion tube 6.

[0031] The upper end of the insertion tube 6 extends out of the insertion hole 5 and is located above the measuring cover 4. The apertures of the insertion tubes 6 are different, and the material of the insertion tubes 6 is glass. First, the insertion tube 6 is used for the measuring ends of the thermal resistor to be tested and the standard thermal resistor to be inserted. The upper end of the insertion tube 6 is extended out of the insertion hole 5 to facilitate observation of whether the insertion tube 6 is normal. Secondly, it is used to fit the upper fitting part 8 to ensure that the insertion tube 6 does not fall into the constant temperature solution. The apertures of the insertion tube 6 are set differently, and the thermal resistors of different diameters to be tested can be calibrated to expand the scope of use. The material of the insertion tube 6 is glass, which can ensure its transparency and facilitate observation of whether there is any abnormality.

[0032] Example 1

[0033] According to the diameter of the insertion tube 6, the circumference of the insertion tube 6 is calculated to be 5 cm. The length of the insertion tube 6 extending out of the insertion hole 5 is measured to be 5 cm. A section of plastic metal material is cut as the support member 7, and a section of 8 cm in length and 8 cm in width is cut as the support member 7.

[0034] Use scissors to cut one end of the support member 7 into a serrated shape, and apply glue on one side to divide the support member 7 into an upper fitting portion 8 and a lower fitting portion 9. Fit one side of the upper fitting portion 8 coated with glue to the outer wall of the insertion tube 6, and fit one side of the lower fitting portion 9 coated with glue to the measuring cover 4, so as to support the insertion tube 6 and avoid falling due to its own weight during calibration.

Claims

1. A device for calibrating thermal resistance or bimetallic thermometer in steel mills, characterized in that: include: The housing (1) is a hollow cavity with an opening at the top, and the hollow cavity is used to contain a constant temperature solution. A heating device is located at the bottom of the hollow cavity of the housing (1) and is used to heat the solution in the hollow cavity. The heat-insulating sealing plate (2) is located at the upper end of the hollow cavity, and its edge is fixedly connected to the edge of the hollow cavity, and is used to form a sealed cavity with the shell (1). The heat-insulating sealing plate (2) is provided with a measuring hole (3). The measuring cover (4) is located above the heat-insulating sealing plate (2) and covers the measuring hole (3). The measuring cover (4) and the heat-insulating sealing plate (2) are in the same horizontal plane. A plurality of insertion holes (5) are formed on the measuring cover (4). The insertion tube (6) is a tube body with an open upper end, and its lower end is used to be inserted into each insertion hole (5) and inserted into the constant temperature solution so that the constant temperature solution heats it. Each insertion tube (6) is used to insert the thermal resistor or bimetallic thermometer to be calibrated, so that the thermal resistor or bimetallic thermometer to be calibrated is compared with the standard after being heated. A support member (7) is located beside the insertion tube (6) and on the measuring cover (4), the inner wall of which is in contact with the outer wall of the insertion tube (6) and assists and maintains the lower end of the insertion tube (6) in the constant temperature solution and does not touch the bottom of the housing (1); The support member (7) is composed of an upper annular fitting portion (8) and a gear-shaped lower fitting portion (9) which are integrally connected, the upper fitting portion (8) being arranged vertically, and the lower fitting portion (9) being arranged horizontally, the upper fitting portion (8) surrounding and fitting the outer wall of the insertion tube (6), and the lower fitting portion (9) surrounding the insertion hole (5) and fitting on the measuring cover (4); The upper edge of the upper fitting portion (8) is flush with the upper edge of the insertion tube (6); The inner wall of the upper fitting portion (8) is bonded to the outer wall of the insertion tube (6) extending out of the insertion hole (5) by glue, and the inner wall of the lower fitting portion (9) is bonded to the outer wall of the measuring cover (4) surrounding the insertion hole (5) by glue.

2. A device for calibrating thermal resistance or bimetallic thermometer in a steel plant according to claim 1, characterized in that: The support member (7) is annular and is arranged around the outer wall of the insertion tube (6).

3. A device for calibrating thermal resistance or bimetallic thermometer in a steel plant according to claim 2, characterized in that: The upper end of the insertion tube (6) extends out of the insertion hole (5) and is located above the measuring cover (4).

4. A device for calibrating thermal resistance or bimetallic thermometer in a steel plant according to claim 3, characterized in that: The apertures of the insertion tubes (6) are different.

5. A device for calibrating thermal resistance or bimetallic thermometer in a steel plant according to claim 4, characterized in that: The material of the insertion tube (6) is glass.

6. A device for calibrating thermal resistance or bimetallic thermometer in a steel plant according to claim 5, characterized in that: The solution in the hollow cavity of the shell (1) is water or oil.

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