Sensor automatic verification system

Abstract

An automatic verification system for a sensor relates to the technical field of temperature sensor verification and mainly comprises a verification device, a verification support, a circuit module and a control panel, a test groove is arranged below the verification support, and the verification support is in contact with the side surface of the test groove and can axially move along the test groove. More than two groups of thermostatic baths and drying baths are alternately arranged in the test tank, the verification bracket comprises a bracket base, vertical supports, a connecting beam and a fixing rod, the bracket base is provided with a group of vertical supports, the two groups of vertical supports are connected through the connecting beam capable of moving up and down along the vertical supports, the middle section of the connecting beam is vertically and downwards provided with the fixing rod, and the fixing rod is connected with the vertical supports through the connecting beam. A sensor frame is arranged on the fixing rod, so that the sensor frame can extend into the constant-temperature tank and the drying tank; according to the utility model, a plurality of groups of thermal resistors can be simultaneously and independently verified and tested, extra manual intervention is not needed in the testing process, the testing efficiency and accuracy are higher than those in the conventional manual verification process, and automatic verification can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature sensor verification, in particular to an automatic sensor verification system. Background Art

[0002] Conventional temperature sensors are mainly divided into two categories: thermocouples and thermal resistors according to the characteristics of materials and components. Both of them are used to convert the thermal signals collected by the temperature sensing end into electrical signals and transmit them to the measuring instrument to detect temperature changes. Therefore, the calibration of temperature sensors has become the key to their accurate operation. In the currently more commonly used calibration method, the sensor is often set up by manual wiring, and then manually transferred to the test environment for temperature testing and calibration. The test efficiency is very limited, and manual operation is prone to introduce more random errors, which affects the accuracy of the calibration test. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a sensor automatic calibration system, which can automatically calibrate the temperature sensor, effectively improve the test efficiency, and ensure the test accuracy.

[0004] A sensor automatic calibration system in the utility model comprises:

[0005] A calibration device, which is used to accommodate the basic components required to perform the calibration operation;

[0006] A calibration bracket is arranged on the upper surface of the calibration device;

[0007] A circuit module, used to realize a closed circuit connection with the sensor to be tested;

[0008] A control panel, used to control the verification device;

[0009] A test slot is arranged below the test bracket, the test bracket contacts the side surface of the test slot and can move axially along the test slot, and two or more groups of constant temperature slots and drying slots are alternately arranged in the test slot along the moving direction of the test bracket;

[0010] The calibration bracket includes a bracket base, a vertical support, a connecting beam, and a fixing rod, wherein the bracket base consists of two parts mirrored along the center line of the test slot, each part contacts one side of the test slot respectively, and each group of bracket bases contacting the side of the test slot is provided with a group of vertical supports, and the two groups of vertical supports are connected by a connecting beam that can move up and down along the vertical supports, and a fixing rod is vertically downwardly arranged in the middle section of the connecting beam, and a sensor holder detachably connected thereto can be arranged on the fixing rod, so that the sensor holder can extend into the constant temperature tank and the drying tank under the action of the connecting beam and the fixing rod.

[0011] One implementation mode of the utility model is that the test slot is provided with a slot structure for accommodating a support motor on two sets of side surfaces respectively contacting two parts of the bracket base. The support motor is a linear motor capable of moving axially along the test slot in the slot structure, which is electrically connected to the control panel, and the support motor is connected to the bracket base.

[0012] One implementation mode of the utility model is that the vertical supports are all provided with vertical slide grooves, and the tops of the vertical supports are all provided with support motors of the linear motor type, the support motors are electrically connected to the control panel, and the connecting beams can slide up and down in the vertical slide grooves under the drive of the support motors.

[0013] One implementation mode of the utility model is that the sensor rack includes an upper plate body, a lower plate body, and a connecting tube, wherein the upper plate body is a horizontally arranged rectangular flat plate, and the lower plate body is a parallel rectangular flat plate of the same shape located below the upper plate body, and the two are connected by a vertically arranged connecting tube, which is a hollow tube body inside and can form an interference fit connection with the fixing rod, and the upper plate body is provided with a plurality of groups of vertically through-limiting through holes, and the lower plate body is provided with a plurality of groups of accommodating grooves vertically corresponding to the positions of the limiting through holes.

[0014] Furthermore, a through hole with a diameter smaller than the diameter of the accommodating groove is provided on the bottom surface of the accommodating groove.

[0015] An implementation manner of the utility model is that a temperature control tube and an ultrasonic transducer electrically connected to a control panel are arranged on the side wall of the thermostatic bath.

[0016] An implementation manner of the utility model is that a plurality of groups of air jet devices are arranged on the side wall of the drying tank, and the air jet devices are electrically connected to the control panel.

[0017] The technical effects of the utility model are:

[0018] The utility model can perform independent verification tests on multiple groups of thermal resistors at the same time, and the test process does not require additional human intervention. The test efficiency and accuracy are higher than the conventional manual verification process, and automatic verification can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is an overall schematic diagram of the utility model;

[0021] Figure 2 It is a cross-sectional view of the section where the thermostatic bath in the utility model is located;

[0022] Figure 3 It is a cross-sectional view of the section where the drying tank in the utility model is located;

[0023] Figure 4 It is a schematic diagram of the sensor frame in the utility model;

[0024] In the figure: 1-calibration device, 2-calibration bracket, 3-circuit module, 4-control panel, 5-constant temperature bath, 6-support motor, 7-sensor rack, 8-drying tank, 9-test tank, 21-bracket base, 22-vertical support, 23-support motor, 24-connecting beam, 25-fixing rod, 51-temperature control tube, 52-ultrasonic transducer, 71-upper plate, 72-lower plate, 73-connecting tube, 74-limiting through hole, 75-accommodating groove, 81-jet device. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the embodiments and drawings.

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0027] Example:

[0028] like Figure 1 As shown, a sensor automatic calibration system comprises:

[0029] The calibration device 1 is used to accommodate the basic components required for the calibration operation, and includes a power supply and corresponding electronic components required for the calibration operation;

[0030] The calibration bracket 2 is arranged on the upper surface of the calibration device 1, and its function is to support the sensor rack 7 during calibration and allow the sensor rack 7 to move along the direction of the test slot 9;

[0031] Circuit module 3, used to realize closed circuit connection with the sensor to be tested. Circuit module 3 can refer to the corresponding components on the conventional testing system, including conventional circuit connectors, power supply, etc. Its function is to form a closed loop by electrically connecting with the thermal resistor to be tested through the wire during the test, thereby realizing normal testing of the sensor;

[0032] The control panel 4 is used to control the calibration device. According to the prior art, the control panel 4 can be regarded as the central control system that realizes electrical connection with the electronic devices and mechanical equipment of the entire calibration system, provides support for automatic control, and can include corresponding interaction and control ports for user operation;

[0033] Among them, a test slot 9 is arranged below the calibration bracket 2, and the test slot 9 can be isolated from the outside world by a glass system. The calibration bracket 2 contacts the side surface of the test slot 9 and can move axially along the test slot 9. In the test slot 9, more than two groups of constant temperature slots 5 and drying slots 8 are alternately arranged in sequence along the moving direction of the calibration bracket 2. In this embodiment, the test slot 9 is provided with slot structures for accommodating the support motor 6 on two groups of side surfaces that are respectively in contact with the two parts of the bracket base 21. The support motor 6 is a linear motor that can move axially along the test slot 9 in the slot structure. It is electrically connected to the control panel 4, and the support motor 6 is connected to the bracket base 21. In this way, a moving instruction can be sent to the support motor 6 through the control panel 4, so that it drives the calibration bracket 2 to move axially along the test slot 9. According to the prior art in the field, it can be known that the moving state of the support motor 6 can be programmed to have a specific order, so that the calibration bracket 2 can move according to specific requirements.

[0034] See also Figure 2 , Figure 3The calibration bracket 2 includes a bracket base 21, a vertical support 22, a connecting beam 24, and a fixing rod 25, wherein the bracket base 21 is composed of two parts mirror-set along the center line of the test slot 9, each of which is in contact with one side of the test slot 9, and each group of bracket bases 21 in contact with the side of the test slot 9 is provided with a group of vertical supports 22, and the two groups of vertical supports 22 are connected by a connecting beam 24 that can move up and down along the vertical supports 22. In this embodiment, vertical slide grooves are provided on the vertical supports 22, and a support motor 23 of a linear motor type is provided on the top of the vertical supports 22. The support motor 23 is electrically connected to the control panel 4, and the connection method can be wire connection or wireless connection. In this embodiment, wireless connection is preferred. The connecting beam 24 can slide up and down in the vertical slide groove under the drive of the support motor 23. The connecting beam 2 A fixing rod 25 is vertically downwardly arranged at the middle section of 4, and a sensor holder 7 detachably connected thereto can be arranged on the fixing rod 25, so that the sensor holder 7 can extend into the constant temperature bath 5 and the drying bath 8 under the action of the connecting beam 24 and the fixing rod 25. Under the control of the control panel 4, the connecting beam 24 can move up and down along the vertical support 22, so that the fixing rod 25 can move up and down at the same time. After the sensor holder 7 is connected to the fixing rod 25, the sensor holder 7 can also move up and down into the constant temperature bath 5 or the drying bath 8 driven by the fixing rod 25. When the sensor holder 7 extends into the constant temperature bath 5, the sensor on the sensor holder 7 can be tested. After the test is completed, the sensor holder 7 is transferred to the drying bath 8 and dried. After the test is completed, it enters the next constant temperature bath 5 to continue the test, thereby realizing the automated verification test for the sensor.

[0035] See also Figure 4 The sensor holder 7 includes an upper plate body 71, a lower plate body 72, and a connecting tube 73, wherein the upper plate body 71 is a horizontally arranged rectangular flat plate, and the lower plate body 72 is a parallel rectangular flat plate of the same shape located below the upper plate body 71, and the two are connected by a vertically arranged connecting tube 73, which is a hollow tube body inside, and can form an interference fit connection with the fixing rod 25. The upper plate body 71 is provided with a plurality of groups of vertically penetrating limiting through holes 74, and the lower plate body 72 is provided with a plurality of groups of receiving grooves 75 vertically corresponding to the positions of the limiting through holes 74. During the calibration test, the plurality of groups of sensors that are closedly connected with the circuit module 3 can be placed on the receiving grooves 75 through the limiting through holes 74. When the sensor holder 7 is extended into the constant temperature bath 5 for testing, the calibration test for the plurality of groups of sensors can be realized, which can effectively improve the efficiency of the calibration test.

[0036] In this embodiment, a through hole with a diameter smaller than that of the accommodating groove 75 is provided on the bottom surface of the accommodating groove 75. The through hole allows the wires connected to the sensor to pass through and keeps the sensor stably placed in the accommodating groove 75, so as to facilitate the calibration and testing of the sensor.

[0037] In this embodiment, a temperature control tube 51 and an ultrasonic transducer 52 electrically connected to the control panel 4 are provided on the side wall of the thermostatic bath 5, and a plurality of jet devices 81 are provided on the side wall of the drying bath 8, and the jet devices 81 are electrically connected to the control panel 4. According to JJG229-2010 industrial and platinum-copper thermal resistor verification regulations, thermal resistor sensors need to be tested in a liquid with a certain temperature during verification testing, and there are relatively strict requirements for the removal of bubbles in the liquid. Therefore, an ultrasonic transducer 52 is provided in the thermostatic bath 5, and bubbles can be removed from the test liquid in the thermostatic bath 5 before the test to ensure the test effect. The ultrasonic transducer 52 can be connected to the ultrasonic generator integrated inside the calibration device 1. Its structural setting belongs to the existing technology and is not specifically limited here. A plurality of sets of jet devices 81 are arranged in the drying tank 8. After the sensor completes the test in the previous constant temperature tank 5, it can first enter the drying tank 8 and be dried by the airflow sprayed by the jet device 81 before entering the next constant temperature tank 5, thereby ensuring the cleanliness of the sensor surface and avoiding interference from liquids of different temperatures. The jet device 81 can also be connected to the gas generating equipment integrated inside the calibration device 1. Its structure belongs to the existing technology and is not specifically limited here.

[0038] When in use, the sensor to be tested connected to the circuit module 3 is placed on the sensor holder 7, and the sensor holder 7 is installed on the fixing rod 25. Under the setting of the program, the calibration bracket 2 first moves along the test slot 9 to the top of the constant temperature tank 5. At this time, the program controls the support motor 23 to control the connecting beam 24 and the fixing rod 25 to move downward, so that the sensor holder 7 enters the constant temperature tank 5 for calibration. After the calibration is completed, the support motor 23 controls the connecting beam 24 and the fixing rod 25 to reset upward, and then the calibration bracket 2 moves to the top of the drying slot 8, and the bottom of the sensor holder 7 is dried in the same way, and then proceed. Enter the next thermostatic bath 5 for calibration test. The whole process can be controlled by the pre-set program in the control panel 4. The calibration process complies with the JJG229-2010 industrial and platinum-copper thermal resistor calibration regulations, and multiple groups of equipment can be tested simultaneously. Each device can be independently operated and controlled and complete the test independently. It has 2-wire, 3-wire, and 4-wire measurement methods and meets the sensor AA and A grade thermal resistor calibration requirements. The working temperature is -40-300°, and the thermostatic bath temperature is uniform ≤0.01°. It can realize automatic calibration, automatically save original records, and automatically produce calibration reports.

[0039] In the description of the present invention, it should be pointed out that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and 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 direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

[0040] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the embodiment of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A sensor automatic calibration system, characterized in that: include: A calibration device (1) for accommodating basic components required for performing a calibration operation; A calibration bracket (2) is arranged on the upper surface of the calibration device (1); A circuit module (3), used to realize a closed circuit connection with the sensor to be tested; A control panel (4) for controlling the calibration device; A test slot (9) is arranged below the test bracket (2), the test bracket (2) contacts the side surface of the test slot (9) and can move axially along the test slot (9), and more than two groups of constant temperature slots (5) and drying slots (8) are alternately arranged in the test slot (9) along the moving direction of the test bracket (2); The test bracket (2) comprises a bracket base (21), a vertical support (22), a connecting beam (24), and a fixing rod (25), wherein the bracket base (21) is composed of two parts arranged in a mirror image along the center line of the test slot (9), each part of which contacts one side of the test slot (9), and each group of bracket bases (21) contacting the side of the test slot (9) is provided with a group of vertical supports (22), and the two groups of vertical supports (22) are connected via a connecting beam (24) that can move up and down along the vertical supports (22), and a fixing rod (25) is arranged vertically downward at the middle section of the connecting beam (24), and a sensor holder (7) detachably connected thereto can be arranged on the fixing rod (25), so that the sensor holder (7) can extend into the constant temperature tank (5) and the drying tank (8) under the action of the connecting beam (24) and the fixing rod (25).

2. The automatic sensor calibration system according to claim 1, characterized in that: The test slot (9) is provided with slot structures for accommodating a support motor (6) on two groups of side surfaces respectively contacting two parts of the support base (21); the support motor (6) is a linear motor capable of moving axially along the test slot (9) in the slot structure, and is electrically connected to the control panel (4), and the support motor (6) is connected to the support base (21).

3. The automatic sensor calibration system according to claim 1, characterized in that: The vertical supports (22) are all provided with vertical slide grooves, and the tops of the vertical supports (22) are all provided with support motors (23) of the linear motor type, the support motors (23) are electrically connected to the control panel (4), and the connecting beams (24) can slide up and down in the vertical slide grooves under the drive of the support motors (23).

4. The automatic sensor calibration system according to claim 1, characterized in that: The sensor frame (7) comprises an upper plate body (71), a lower plate body (72), and a connecting tube (73), wherein the upper plate body (71) is a horizontally arranged rectangular flat plate, and the lower plate body (72) is a parallel rectangular flat plate of the same shape located below the upper plate body (71), and the two are connected by a vertically arranged connecting tube (73), and the connecting tube (73) is a hollow tube body inside, which can form an interference fit connection with the fixing rod (25), and the upper plate body (71) is provided with a plurality of groups of vertically through-limiting through holes (74), and the lower plate body (72) is provided with a plurality of groups of accommodating grooves (75) vertically corresponding to the positions of the limiting through holes (74).

5. The automatic sensor calibration system according to claim 4, characterized in that: A through hole having a diameter smaller than the diameter of the accommodating groove (75) is provided on the bottom surface of the accommodating groove (75).

6. The automatic sensor calibration system according to claim 1, characterized in that: A temperature control tube (51) and an ultrasonic transducer (52) electrically connected to the control panel (4) are arranged on the side wall of the thermostatic bath (5).

7. The automatic sensor calibration system according to claim 1, characterized in that: A plurality of groups of air-jet devices (81) are arranged on the side wall of the drying tank (8), and the air-jet devices (81) are electrically connected to the control panel (4).

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