Device for testing and calibrating temperature sensor

Abstract

The utility model relates to a device for testing and calibrating a temperature sensor, which belongs to the technical field of sensor testing and calibrating, and comprises a main control board, the main control board is connected with a sub-control board, an itinerant detector, an incubator and a PC (Personal Computer), the sub-control board is connected with a carrier plate, the carrier plate is arranged in the incubator and is used for installing a temperature sensor to be tested, the itinerant detector is connected with a platinum resistor, and the platinum resistor is arranged in the incubator. A top cover is arranged at the top end of the incubator, a fixing frame is arranged at the bottom end of the incubator, a plurality of sets of supports used for fixedly installing the carrier plate are inserted into the upper end of the fixing frame, the supports are detachably connected in the vertical direction, and each support comprises an insertion part and a telescopic clamp stretching out and drawing back in the horizontal direction. The bottom end of the inserting part is inserted into the upper end of the fixing frame or the top end of the inserting part of the other support, and the telescopic clamp is vertically connected to the middle of the inserting part. And a plurality of groups of carrier plates can be mounted, the efficiency of single calibration is improved, and the sensors are arranged and placed in order, so that mutual interference among the sensors is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor testing and calibration, in particular to a device for testing and calibration of a temperature sensor. Background Art

[0002] A sensor is a device that converts sensory signals into electrical signals that can be used for information processing, including temperature sensors, pressure sensors, photoelectric sensors, etc.

[0003] A temperature sensor is a device or sensor used to measure and monitor the temperature of an object or environment. It is able to convert temperature into an electrical signal or other types of output signals for temperature measurement, monitoring and control. Temperature sensors are used in a variety of fields and applications, including industrial production, scientific research, environmental monitoring, medical equipment, electronic equipment, etc. They play an important role in many systems and devices, such as temperature control systems, climate control systems, cooling systems, etc. Temperature sensors play a key role in various applications, helping to measure and control temperature and keep the system running and safe.

[0004] In practical applications, the data output by temperature sensors is often affected by environmental, physical, electronic and other factors, resulting in errors. Temperature sensors usually need to be calibrated to ensure the accuracy and reliability of their measurement results. Calibration is a calibration process that determines the difference between the sensor output and the actual temperature by comparing it with a known precise temperature value, and makes corrections to improve the precision and accuracy of the sensor's output data.

[0005] When calibrating temperature sensors, the sensors are usually placed in a temperature chamber. When there are a large number of calibrated sensors, the sensors will be placed in a disorderly manner and there may be cross interference between the sensors. Utility Model Content

[0006] The utility model provides a device for testing and calibrating a temperature sensor, comprising a main control board, the main control board is connected to a sub-control board, a patrol meter, a temperature box and a PC, the sub-control board is connected to a carrier board, the carrier board is placed in the temperature box, the carrier board is used to install a temperature sensor to be tested, the patrol meter is connected to a platinum resistor, the platinum resistor is placed in the temperature box, a top cover is provided at the top of the temperature box, a fixing frame is provided at the bottom of the temperature box, a second groove is provided on the upper end surface of the fixing frame, and a bracket for fixing and installing the carrier board can be plugged through the second groove;

[0007] The bracket comprises an inserting portion and a telescopic clamp which is telescopic in a direction perpendicular to the inserting portion. The bottom end of the inserting portion is provided with an inserting column which matches with the second groove.

[0008] Furthermore, the telescopic clamp comprises a telescopic sleeve and a grabbing clamp which are telescopically telescopic. One end of the telescopic sleeve is fixedly connected to the plug-in portion, and the other end of the telescopic sleeve is connected to the grabbing clamp.

[0009] Furthermore, the telescopic sleeve comprises an inner tube and an outer tube sleeved outside the inner tube, and a clearance space for the inner tube to move is provided in the outer tube;

[0010] One end of the inner tube is connected to the grabbing clamp, and the other end of the inner tube passes through the outer tube and extends into the avoidance space of the outer tube;

[0011] One end of the outer tube away from the inner tube is connected to the plug-in part.

[0012] Furthermore, a spring is sleeved on the outer side of the inner tube, one end of the spring is fixedly connected to the grabbing clamp, and the other end of the spring is fixedly connected to the outer tube.

[0013] Furthermore, the cross section of the end of the outer tube away from the plug-in portion is a stepped surface, and the end of the inner tube away from the clamp is provided with a stopper.

[0014] Furthermore, the upper portion of the plug-in portion is provided with a first groove which cooperates with the plug-in column.

[0015] Furthermore, the gripper is coated with a rubber film.

[0016] Furthermore, the fixing frame is a hollow structure as a whole.

[0017] The beneficial effects of the utility model include: multiple groups of carrier plates can be installed to increase the efficiency of a single calibration; sensors are arranged in an orderly manner to avoid mutual interference between sensors.

[0018] These and other purposes, features and advantages of the present invention are fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The schematic diagram of the structure in the temperature box of the temperature sensor testing and calibration device of the utility model is shown.

[0020] Figure 2 The schematic diagram of the structure of the bracket of the temperature sensor testing and calibration device of the utility model is shown.

[0021] Figure 3 A partial perspective view of a bracket of the temperature sensor testing and calibration device of the present invention is shown.

[0022] Figure 4 The cross-sectional view of the outer tube and the inner tube of the temperature sensor testing and calibration device of the utility model is shown.

[0023] Figure 5 The utility model shows a schematic diagram of the principle of the device for testing and calibrating the temperature sensor.

[0024] Figure markings: 1-main control board, 2-sub-control board, 3-inspection instrument, 4-temperature box, 5-PC, 6-carrier board, 7-platinum resistor, 8-bracket, 801-plug-in part, 802-plug-in column, 803-telescopic sleeve, 804-clamp, 805-inner tube, 806-outer tube, 807-block, 9-first groove, 10-fixed frame, 11-second groove. DETAILED DESCRIPTION

[0025] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0026] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0027] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0028] refer to Figures 1 to 5 A device for testing and calibrating a temperature sensor according to a preferred embodiment of the utility model will be described in detail below. The calibration device includes a main control board 1, which is connected to a plurality of sub-control boards 2, a patrol meter 3, a temperature box 4 and a PC 5. Each sub-control board 2 is connected to a carrier board 6, which is placed in the temperature box 4. The carrier board 6 is integrated with a test socket for installing the temperature sensor to be tested. The patrol meter 3 is connected to a platinum resistor 7, which is placed in the temperature box 4. A top cover is provided at the top of the temperature box 4, and a avoidance groove is opened on the top cover. The connecting wires of the platinum resistor 7 and the carrier board 6 are connected to the patrol meter 3 and the sub-control board 2 after passing through the avoidance groove.

[0029] A fixing frame 10 is provided at the bottom end of the temperature box 4, and a second groove 11 is opened on the upper end surface of the fixing frame 10. A bracket 8 for fixing the mounting plate 6 can be inserted through the second groove 11. The fixing frame 10 is used to fix the bracket 8. Several groups of brackets 8 are detachably connected in the vertical direction. When there are more temperature sensors to be measured, brackets 8 can be added.

[0030] The bracket 8 includes a plug-in portion 801 and a telescopic clamp that is telescopic in a direction perpendicular to the plug-in portion 801. The bottom end of the plug-in portion 801 is provided with a plug-in column 802 that matches the second groove 11, which is used to plug the upper end of the fixing frame 10 or the top of the plug-in portion 801 of another group of brackets 8. The bottom of the plug-in portion 801 is provided with a plug-in column 802, and the upper part of the plug-in portion 801 is provided with a first groove 9 that matches the plug-in column 802, so that the bracket 8 can be spliced ​​in multiple layers as needed in the vertical direction through the plug-in column 802 and the first groove 9. The telescopic clamp is vertically connected to the middle part of the plug-in portion 801 and is used to grab the carrier 6.

[0031] The telescopic clamp includes a telescopic sleeve 803 stretched in the horizontal direction and a gripper 804, wherein the gripper 804 is coated with a rubber film to prevent the gripper 804 from scratching the carrier 6. One end of the telescopic sleeve 803 is fixedly connected to the plug-in portion 801, and the other end of the telescopic sleeve 803 is connected to the gripper 804.

[0032] The telescopic sleeve 803 includes an inner tube 805 and an outer tube 806 sleeved on the outer side of the inner tube 805, and an escape space for the inner tube 805 to move is provided in the outer tube 806. One end of the inner tube 805 is connected to the gripping clamp 804, and the other end of the inner tube 805 passes through the outer tube 806 and extends into the escape space of the outer tube 806. One end of the outer tube 806 away from the inner tube 805 is connected to the plug-in portion 801. A spring is sleeved on the outer side of the inner tube 805, one end of the spring is fixedly connected to the gripping clamp 804, and the other end of the spring is fixedly connected to the outer tube 806. In order to make the temperature in the incubator 4 more uniform, the fixing frame 10 is a hollow structure as a whole. In addition, in order to prevent the inner tube 805 from moving outside the outer tube 806 due to the spring force, the cross-section of the end of the outer tube 806 away from the plug-in portion 801 is set as a step surface, that is, the diameter of the cross-section at the end away from the plug-in portion 801 is smaller than the diameter of the cross-section at the end close to the plug-in portion 801, and a stopper 807 is provided at the end of the inner tube 805 away from the clamp 804, and the diameter of the cross-section of the stopper 807 is larger than the diameter of the cross-section of the inner tube 805.

[0033] Exemplarily, the spring may be disposed inside the outer tube 806 and sleeved outside the inner tube 805 , one end of the spring is connected to the stopper 807 , and the other end of the spring is connected to the step surface of the outer tube 806 .

[0034] Working principle and workflow:

[0035] Insert the plug-in column 802 of the bracket 8 into the second groove 11, and the two brackets 8 are symmetrically arranged, pushing the telescopic sleeve gripper 804 to move towards the plug-in portion 801, the spring is compressed, and the inner tube 805 moves in the avoidance space of the outer tube 806, and the carrier 6 with the temperature sensor installed is placed. The gripper 804 clamps the carrier 6. Under the influence of the spring elastic force, the spring drives the inner tube 805 to move away from the plug-in portion 801, and a group of brackets 8 symmetrically arranged in the horizontal direction fix the carrier 6. After fixing the carrier 6, the plug-in portion 801 of another group of brackets 8 is inserted into the first groove 9, and the above steps of installing the carrier 6 are repeated. Multiple groups of carriers 6 can be installed to increase the efficiency of a single calibration. The sensors are arranged in an orderly manner to avoid mutual interference between sensors.

[0036] The temperature sensor is installed on the carrier board 6, which is located in the temperature box 4. The main control board 1 can control the temperature in the temperature box 4. The temperature sensor transmits the detected temperature of the temperature box 4 to the sub-control board 2 through the carrier board 6, and then to the main control board 1. At the same time, the platinum resistor 7 placed in the temperature box 4 is connected to the inspection instrument 3, and the main control board communicates with the inspection instrument 3. The main control board 1 communicates with the PC5 computer host, and can burn in the calibration program to calibrate the temperature sensor.

[0037] Calibration is divided into two steps: temperature rotation and temperature translation, among which temperature translation is further divided into coarse adjustment and fine adjustment.

[0038] Temperature rotation is to measure the temperature with the chip at 0℃ and 85℃ respectively, and calculate the chip temperature error at the two temperatures (temperature error ΔT = chip temperature measurement result - temperature value of platinum resistance). After calculating the temperature error at 0℃ and 85℃, the position of the fuse to be adjusted is located according to the size of the rotation, and then the corresponding fuse is burned to complete the adjustment.

[0039] Temperature shift is to measure the temperature with the chip at 25℃, calculate the chip temperature error at 25℃ (temperature error ΔT = chip temperature measurement result - temperature value of platinum resistor), find the closest condition in the temperature shift lookup table (first perform rough adjustment calculation, then fine adjustment calculation), and then adjust the corresponding fuse according to the table. After completing the rotation and translation fuse adjustment, the chip temperature can be read and compared with the temperature of the temperature acquisition instrument to determine the temperature error of the calibrated product and judge whether the calibration is successful.

[0040] It should be noted that the terms "first, second" in the present invention are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0041] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A device for testing and calibrating a temperature sensor, comprising a main control board (1), the main control board (1) being connected to a sub-control board (2), a patrol meter (3), a temperature box (4) and a PC (5), the sub-control board (2) being connected to a carrier board (6), the carrier board (6) being placed in the temperature box (4), the carrier board (6) being used to install a temperature sensor to be tested, the patrol meter (3) being connected to a platinum resistor (7), the platinum resistor (7) being placed in the temperature box (4), characterized in that: The top end of the temperature box (4) is provided with a top cover, the bottom end of the temperature box (4) is provided with a fixing frame (10), the upper end surface of the fixing frame (10) is provided with a second groove (11), and a bracket (8) for fixing and installing the carrier plate (6) can be plugged into the second groove (11); The bracket (8) comprises an inserting portion (801) and a telescopic clamp that telescopes in a direction perpendicular to the inserting portion (801), and a plugging column (802) that matches the second groove (11) is provided at the bottom end of the inserting portion (801).

2. The temperature sensor testing and calibration device according to claim 1, characterized in that: The telescopic clamp comprises a telescopic sleeve (803) that telescopes in a horizontal direction and a gripping clamp (804); one end of the telescopic sleeve (803) is fixedly connected to the plug-in portion (801), and the other end of the telescopic sleeve (803) is connected to the gripping clamp (804).

3. The temperature sensor testing and calibration device according to claim 2, characterized in that: The telescopic sleeve (803) comprises an inner tube (805) and an outer tube (806) sleeved on the outer side of the inner tube (805), and a space for avoiding the movement of the inner tube (805) is provided in the outer tube (806); One end of the inner tube (805) is connected to the gripping clamp (804), and the other end of the inner tube (805) passes through the outer tube (806) and extends into the avoidance space of the outer tube (806); One end of the outer tube (806) away from the inner tube (805) is connected to the plug-in portion (801).

4. The temperature sensor testing and calibration device according to claim 3, characterized in that: A spring is sleeved on the outer side of the inner tube (805), one end of the spring is fixedly connected to the gripping clamp (804), and the other end of the spring is fixedly connected to the outer tube (806).

5. The temperature sensor testing and calibration device according to claim 4, characterized in that: The cross section of the end of the outer tube (806) away from the plug-in portion (801) is a stepped surface, and the end of the inner tube (805) away from the gripping clamp (804) is provided with a stopper (807).

6. The temperature sensor testing and calibration device according to any one of claims 1 to 5, characterized in that: The upper part of the plug-in portion (801) is provided with a first groove (9) which cooperates with the plug-in column (802).

7. The temperature sensor testing and calibration device according to claim 6, characterized in that: The gripper (804) is covered with a rubber membrane.

8. The temperature sensor testing and calibration device according to claim 7, characterized in that: The fixing frame (10) is a hollow structure as a whole.

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