Testing device

Abstract

The invention discloses a test device, and relates to the technical field of heating element temperature test and calibration, the test device is used for temperature test and calibration of a heating element, the test device comprises a test fixture, a temperature sensor and a heating element, the test fixture is configured to extend into the heating element; the temperature sensor is arranged on the test fixture in a penetrating manner, and the temperature sensor is electrically connected with the heating body; the heating piece is arranged on the test fixture, and the heating piece is electrically connected with the temperature sensor.

Description

Technical Field

[0001] The invention relates to the technical field of heating element temperature testing and calibration, and in particular to a testing device. Background Art

[0002] Before the final assembly stage of the aerosol heating element production line, the temperature of the heating element needs to be accurately debugged and calibrated to ensure that its performance meets the design requirements. In related technologies, the test fixture is usually calibrated at room temperature (25°C), which is significantly different from the actual working temperature of the heating element (about 250°C ± 5°C). This temperature difference causes the heat of the heating element to be transferred to the fixture when the test fixture is extended into the heating element for temperature testing. The temperature of the heating element can only be effectively tested and calibrated after the temperature of the heating element and the fixture are balanced. The temperature of the fixture is usually close to the ambient temperature, while the temperature of the heating element is higher when it is heating. Therefore, the process of transferring heat from the heating element to the fixture until the temperature of the two is balanced usually takes a long time, which makes the temperature measurement efficiency of the heating element low, causing the test station to become the bottleneck of the production line and low production efficiency. Summary of the invention

[0003] The main purpose of the present invention is to provide a testing device, aiming to improve testing efficiency and production capacity.

[0004] To achieve the above object, the present invention provides a testing device for testing and calibrating the temperature of a heating element, and the testing device comprises:

[0005] a test fixture, the test fixture being configured to extend into the heating body;

[0006] a temperature sensor, the temperature sensor being disposed in the test fixture and electrically connected to the heating element; and

[0007] A heating element is provided on the test fixture and is electrically connected to the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0009] Figure 1 A structural schematic diagram of an embodiment of a testing device is provided for the present invention;

[0010] Figure 2A schematic diagram of an explosion structure of a first viewing angle of an embodiment of a testing device provided by the present invention;

[0011] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0012] Figure 4 A schematic diagram of an explosion structure of a second viewing angle of an embodiment of a testing device provided by the present invention;

[0013] Figure 5 A cross-sectional view of an embodiment of a testing device is provided for the present invention.

[0014] Description of Figure Numbers:

[0015] 100. Test device; 1. Test fixture; 11. Second wire slot; 12. Mounting hole; 121. First limit step; 13. Temperature measuring bracket; 131. Fixing section; 132. Temperature measuring section; 133. Fastening hole; 134. Second limit step; 14. Base; 2. Temperature sensor; 21. Sensor probe; 22. Sensor body; 221. First wire slot; 23. Sensor lead; 3. Heating element; 31. Heating coil; 311. Coil body; 312. Coil lead; 4. Mounting body; 41. Limiting convex ring; 5. Insulation pad; 51. Avoidance hole; 6. Insulation element; 61. First insulation section; 611. Accommodation space; 62. Second insulation section; 621. Receiving groove; 63. Lead avoidance groove; 7. Fastener;

[0016] 200. Heat generating element.

[0017] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0021] The present invention provides a testing device 100 .

[0022] See also Figures 1 to 5 In one embodiment of the present invention, the test device 100 is used for temperature testing and calibration of a heating element 200. The test device 100 includes a test fixture 1, a temperature sensor 2, and a heating element 3. The test fixture 1 is configured to extend into the heating element 200; the temperature sensor 2 is disposed in the test fixture 1, and the temperature sensor 2 is electrically connected to the heating element 200; the heating element 3 is disposed in the test fixture 1, and the heating element 3 is electrically connected to the temperature sensor 2.

[0023] In the technical solution of the present invention, when the temperature of the heating element 200 is tested and calibrated, the heating element 200 heats itself, the heating element 3 heats the test fixture 1, and the test fixture 1 is inserted into the heating element 200. When the heating element 200 is not heated to the target temperature and is lower than the temperature of the test fixture 1, according to the principle of heat conduction, heat will be transferred from the test fixture 1 to the heating element 200. When the temperature of the heating element 200 does not reach the target temperature and exceeds the temperature of the test fixture 1, heat is transferred from the heating element 200 to the test fixture 1 until the temperature sensor 2 detects that the temperatures of the test fixture 1 and the heating element 200 have reached the target temperature. The temperature data detected by the temperature sensor 2 is converted into an electrical signal (such as voltage or current), and then transmitted to the control system through a wire. The control system (which can be a microprocessor or PLC) receives the signal from the temperature sensor 2 and compares it with the preset target temperature. If the temperature detected by the temperature sensor 2 is lower than the target temperature, the control system will start or increase the power output of the heating element 200 and the heating component 3 (such as the heating coil 31) to heat the test fixture 1 and the heating element 200; if the temperature detected by the temperature sensor 2 reaches the target temperature, the control system will control the heating component 3 and the heating element 200 to maintain this heating state so that the heating element 200 is maintained at a constant temperature; due to the setting of the temperature sensor 2 and the heating component 3, the time required for the heating element 200 to reach the target temperature is reduced, the time for the temperature of the heating element 200 and the test fixture 1 to balance is shortened, and the test efficiency and production capacity of the heating element 200 are improved. Among them, the temperature sensor 2 can be a resistance temperature detector or an infrared temperature sensor 2, and the present invention does not limit this. The temperature sensor 2 can be directly in contact with the inner wall of the heating element 200 or close to the inner wall of the heating element 200, and the present invention does not limit this. The heating element 3 may be a heating coil 31 wound on the test fixture 1 , or a heating rod provided on the test fixture 1 , and the present invention does not limit this.

[0024] Specifically, see Figure 4In one embodiment of the present invention, the heating element 3 is a heating coil 31, which is wound around the test fixture 1 and avoids the temperature sensor 2. The heating coil 31 is wound around the test fixture 1 so that the heating coil 31 can directly heat the test fixture 1, thereby quickly transferring heat to the heating element 200. The design of the heating coil 31 needs to avoid the temperature sensor 2 to ensure that the temperature sensor 2 can accurately measure the temperature of the heating element 200, maintain the accuracy of temperature measurement, and ensure the accuracy of temperature control. The heating coil 31 is a common heating element. Electric current passes through the coil to generate a magnetic field, which in turn generates eddy currents in the magnetic material (such as iron), causing the magnetic material (i.e., the test fixture 1) to heat up. This heating method is highly efficient. The heating coil 31 can respond quickly to temperature changes and quickly heat the test fixture 1 to a temperature close to the target temperature, thereby shortening the preheating time of the heating element 200. By precisely controlling the current of the heating coil 31, the temperature of the test fixture 1 can be precisely controlled, thereby precisely controlling the temperature of the heating element 200. In addition, the heating coil 31 is usually simple in structure and easy to maintain and replace, which helps to reduce testing costs.

[0025] For further information, see Figure 4 In one embodiment of the present invention, the heating coil 31 includes a coil body 311 and a coil lead 312, the coil body 311 is electrically connected to the coil lead 312, the coil body 311 is wound around the test fixture 1, a portion of the coil lead 312 is extended along the test fixture 1, and another portion of the coil lead 312 is passed through the test fixture 1 to be exposed from the test fixture 1. The coil body 311 is the actual heating element, which is wound on the test fixture 1, and the coil lead 312 is used to connect the coil body 311 and the power supply or other control equipment; the coil body 311 is directly wound on the test fixture 1 that needs to be heated, so that the heating is more direct and efficient, and the heat can be quickly transferred to the test fixture 1 and the heating element 200; part of the structure of the coil lead 312 extends along the test fixture 1 to ensure the electrical connection between the coil lead 312 and the coil body 311 and the safe arrangement of the coil lead 312, and another part of the structure of the coil lead 312 is passed through the test fixture 1 and exposed on the test fixture 1 to guide the coil lead 312 out of the heating area so as to be connected to an external power supply or control device, thereby facilitating installation and maintenance.

[0026] More specifically, see Figure 2 and Figure 3In one embodiment of the present invention, the temperature sensor 2 includes a sensor probe 21, a sensor body 22 and two sensor leads 23. The two sensor leads 23 are electrically connected to the sensor probe 21. The sensor probe 21 is arranged on the sensor body 22. The two sides of the sensor body 22 are respectively provided with first wire grooves 221. Each sensor lead 23 is limited in one of the first wire grooves 221 and exposed from the sensor body 22. The sensor probe 21 is the part of the temperature sensor 2 that directly contacts the object to be measured and is used to sense temperature changes. The sensor body 22 is the main part of the sensor, which usually contains electronic components and circuits, and is used to process the signal from the sensor probe 21 and convert it into a temperature value that can be read. The sensor lead 23 is responsible for transmitting the temperature signal detected by the sensor probe 21 to an external device. The first wire groove 221 is used to fix the sensor lead 23 to ensure that the lead will not move arbitrarily or interfere with the normal operation of the sensor. The sensor lead 23 is exposed from the sensor body 22 to facilitate the connection of the sensor lead 23 to other devices or circuits.

[0027] To install the temperature sensor 2, refer to Figure 2 and Figure 3 In one embodiment of the present invention, the test device 100 includes a mounting body 4, the test fixture 1 is provided with a mounting hole 12, the inner peripheral wall of the mounting hole 12 is formed with a first limiting step 121, the outer peripheral wall of the mounting body 4 is formed with a limiting convex ring 41, the mounting body 4 passes through the mounting hole 12, and the limiting convex ring 41 abuts against the first limiting step 121 for limiting position; the end of the sensor body 22 away from the sensor probe 21 is penetrated through the mounting body 4, and the two sensor leads 23 are penetrated through the mounting body 4 and exposed from the mounting body 4. Through the design of the mounting hole 12 and the limiting protrusion 41, it can be ensured that the mounting body 4 is accurately positioned on the test fixture 1, thereby ensuring the accurate position of the sensor body 22; the abutment and limiting of the limiting protrusion 41 and the first limiting step 121 provides stable mechanical support, reduces the movement or vibration of the mounting body 4 during operation, and thus improves the stability of temperature measurement; the sensor body 22 and the sensor lead 23 are both passed through the mounting body 4, making maintenance and replacement of the sensor more convenient, without the need for a complicated disassembly process, reducing the time for setting up and replacing the temperature sensor 2, and improving the overall work efficiency; the sensor body 22 is partially embedded in the mounting body 4, which can provide a certain degree of protection for the temperature sensor 2 to prevent physical damage or environmental factors (such as dust, humidity); the sensor lead 23 is passed through the mounting body 4 and exposed to the mounting body 4, which can protect the lead from the influence of the external environment, and also facilitates the management and wiring of the lead, and also facilitates the connection of the sensor lead 23 to other devices or circuits.

[0028] To implement the routing of sensor leads 23, refer to Figure 4 In one embodiment of the present invention, the test fixture 1 is provided with two second wire grooves 11 spaced apart along its extension direction, and the two sensor leads 23 sequentially pass through the two second wire grooves 11 and are passed through the test fixture 1 to be exposed from the test fixture 1. The two second wire grooves 11 arranged at intervals can arrange the sensor leads 23 in an orderly manner, avoid the leads being in a disorderly manner, reduce the entanglement and friction between the cables, and extend the service life of the leads; the wire grooves can provide physical protection for the sensor leads 23 to prevent damage caused by external factors (such as mechanical friction and impact); the sensor leads 23 sequentially pass through the two second wire grooves 11 and are passed through the test fixture 1, which helps to fix the position of the leads and ensure that the leads will not be loosened due to movement or vibration. When the sensor needs to be maintained or replaced, the orderly arranged leads make the operation more convenient and reduce the maintenance time and difficulty.

[0029] See also Figure 1 and Figure 2In one embodiment of the present invention, the test fixture 1 includes a temperature measuring bracket 13 and a base 14, the temperature measuring bracket 13 has a fixed section 131 and a temperature measuring section 132, the cross-sectional area of ​​the fixed section 131 is larger than the cross-sectional area of ​​the temperature measuring section 132, the fixed section 131 is connected to the base 14, the temperature measuring section 132 is configured to extend into the heating element 200, the temperature sensor 2 is arranged in the temperature measuring section 132, and the heating element 3 is arranged in the temperature measuring section 132; the test device 100 includes a thermal insulation pad 5, and the thermal insulation pad 5 is arranged between the fixed section 131 and the base 14. The base 14 is used to be placed on a working plane. The temperature measuring bracket 13 is divided into a fixed section 131 and a temperature measuring section 132. The cross-sectional area of ​​the fixed section 131 is larger than the cross-sectional area of ​​the temperature measuring section 132 and the fixed section 131 is connected to the base 14, which helps to improve the stability and load-bearing capacity of the test fixture 1, and provides a solid foundation for the temperature measuring section 132 extending into the heating element 200, while reducing the heat loss of the temperature measuring section 132; the temperature measuring section 132 directly extends into the heating element 200 to measure the temperature inside the heating element 200 to ensure the accuracy of the temperature reading. The temperature sensor 2 is arranged in the temperature measuring section 132 for real-time monitoring and recording the temperature of the heating element 200 to provide accurate data for temperature control and calibration. The heating element 3 is arranged in the temperature measuring section 132 and is electrically connected to the temperature sensor 2. It is used to heat the temperature measuring section 132 to assist the heating element 200 to quickly reach the target temperature; the thermal insulation pad 5 can effectively prevent or reduce the heat generated by the temperature measuring section 132 and the heating element 3 from being conducted to the base 14, thereby reducing heat loss and improving heating efficiency. Reducing heat loss means that less energy is required to maintain the required temperature, thereby reducing energy consumption and operating costs; by reducing unnecessary heat conduction, the thermal insulation pad 5 helps to maintain the temperature stability of the environment surrounding the test device 100, providing favorable conditions for precise temperature control; the thermal insulation pad 5 can not only protect the base 14 from high temperature, but also protect other components that may be damaged by high temperature, such as electronic components, plastic parts, etc., thereby improving the safety of the entire test device 100.

[0030] To improve the safety of the test device 100, please refer to Figure 1 and Figure 2In one embodiment of the present invention, the testing device 100 includes a thermal insulation member 6, and the thermal insulation member 6 has a first thermal insulation section 61 and a second thermal insulation section 62. The first thermal insulation section 61 is provided with a receiving space 611, and a partial structure of the fixed section 131 is accommodated in the receiving space 611. The second thermal insulation section 62 is provided with a receiving groove 621 connected to the receiving space 611, and another partial structure of the fixed section 131 is located between the groove wall of the receiving groove 621 and the thermal insulation pad 5. The design of the first insulation section 61 and the second insulation section 62 allows for targeted insulation treatment of different parts of the temperature measuring bracket 13, and this segmented insulation can more effectively control the flow of heat; the accommodating space 611 in the first insulation section 61 can tightly surround a part of the fixed section 131, thereby reducing the heat conduction of this part of the structure to the surrounding environment; the containing groove 621 in the second insulation section 62 can accommodate another part of the fixed section 131, ensuring good thermal isolation between the fixed section 131 and the insulation pad 5 and the external environment, further reducing the heat conduction to the base 14 or other parts through the fixed section 131; the insulation member 6 is usually made of materials with low thermal conductivity, such as ceramics, aerogel insulation materials, glass fibers or special plastics, which can effectively prevent or slow down the loss of heat through conduction, convection and radiation; by reducing the conduction of heat to the base 14 and other components, the insulation member 6 can reduce the temperature of the surface of the test device 100, reduce the risk of operators being scalded by contact with the equipment, and improve the safety of the equipment.

[0031] To avoid coil lead 312 and sensor lead 23, refer to Figure 2 and Figure 4 In one embodiment of the present invention, a lead wire avoidance groove 63 is provided on one side of the thermal insulation member 6 facing the temperature measuring bracket 13 . The lead avoidance groove 63 provides a physical space for the sensor lead 23 and the coil lead 312, keeping them away from high temperature areas, thereby protecting the leads from heat damage and extending their service life; the lead avoidance groove 63 can help reduce electromagnetic interference between leads, especially in areas where the leads are densely packed, which helps to maintain the accuracy of the temperature sensor 2 signal; when the leads need to be maintained or replaced, the lead avoidance groove 63 provides a clear path, making the operation of the leads more convenient and reducing maintenance time and difficulty; the lead avoidance groove 63 helps to maintain the orderly arrangement of the leads and prevent the leads from crossing or entanglement, which is very important for keeping the device tidy and reducing the risk of failure. The design of the lead avoidance groove 63 can adapt to leads of different sizes and shapes, increasing the versatility and adaptability of the device. The lead avoidance groove 63 can also ensure that the leads remain in place and will not shift even if the device moves or vibrates. The setting of the lead avoidance groove 63 helps to maintain the neat appearance of the device, prevents the leads from hanging or scattering at will, and improves the overall aesthetics of the device.

[0032] To facilitate installation and removal of insulation pad 5, please refer to Figure 5 In one embodiment of the present invention, the testing device 100 includes a fastener 7, the fixing section 131 is provided with a fastening hole 133, the inner peripheral wall of the fastening hole 133 is formed with a second limiting step 134, the thermal insulation pad 5 is provided with an avoidance hole 51, the fastener 7 passes through the fastening hole 133 and the avoidance hole 51 and is screwed to the base 14, and a partial structure of the fastener 7 abuts against the second limiting step 134 for limiting. The fastener 7 can be a screw or a bolt, and the present invention does not impose any limitation on this. The fastener 7 can quickly fix the thermal insulation pad 5 on the fixed section 131 without the need for complicated tools or steps, thereby improving the installation efficiency. Since the fastener 7 is detachable, the thermal insulation pad 5 can be easily removed from the fixed section 131, which is convenient for maintenance, cleaning or replacement. The abutment and limiting of the fastener 7 and the second limiting step 134 provide a stable connection, ensuring that the thermal insulation pad 5 will not loosen or shift during the use of the device. By adjusting the length of the fastener 7, it can adapt to thermal insulation pads 5 and bases 14 of different thicknesses, thereby improving the versatility of the device. The use of the fastener 7 can reduce the safety hazards caused by the displacement or loosening of the thermal insulation pad 5, thereby ensuring the safe and reliable operation of the device. The detachable connection method makes it easier to maintain and replace the thermal insulation pad 5 without disassembling the entire device, saving maintenance time and cost, and also allowing different thermal insulation pads 5 to be used in different temperature environments, thereby improving the adaptability and flexibility of the device.

[0033] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A test device for temperature testing and calibration of a heating element, characterized in that: The testing device comprises: a test fixture, the test fixture being configured to extend into the heating body; a temperature sensor, the temperature sensor being disposed in the test fixture and electrically connected to the heating element; and A heating element is provided on the test fixture and is electrically connected to the temperature sensor.

2. The testing device according to claim 1, characterized in that: The heating element is a heating coil, which is wound around the test fixture and avoids the temperature sensor.

3. The testing device according to claim 2, characterized in that: The heating coil includes a coil body and a coil lead, the coil body is electrically connected to the coil lead, the coil body is wound around the test fixture, a portion of the coil lead extends along the test fixture, and another portion of the coil lead passes through the test fixture to be exposed from the test fixture.

4. The testing device according to claim 1, characterized in that: The temperature sensor includes a sensor probe, a sensor body and two sensor leads, the two sensor leads are electrically connected to the sensor probe, the sensor probe is arranged on the sensor body, and first wire grooves are respectively opened on both sides of the sensor body. Each of the sensor leads is confined in one of the first wire grooves and exposed to the sensor body.

5. The testing device according to claim 4, characterized in that: The testing device includes a mounting body, the testing fixture is provided with a mounting hole, the inner peripheral wall of the mounting hole is formed with a first limiting step, the outer peripheral wall of the mounting body is formed with a limiting convex ring, the mounting body passes through the mounting hole, and the limiting convex ring abuts against the first limiting step for limiting position; one end of the sensor body away from the sensor probe is passed through the mounting body, and the two sensor leads are passed through the mounting body and exposed from the mounting body.

6. The testing device according to claim 4, characterized in that: The test fixture is provided with two second wire-passing grooves spaced apart along its extension direction, and the two sensor leads pass through the two second wire-passing grooves in sequence and are passed through the test fixture to be exposed from the test fixture.

7. The testing device according to any one of claims 1 to 6, characterized in that: The test fixture includes a temperature measuring bracket and a base, the temperature measuring bracket has a fixed section and a temperature measuring section, the cross-sectional area of ​​the fixed section is larger than the cross-sectional area of ​​the temperature measuring section, the fixed section is connected to the base, the temperature measuring section is configured to extend into the heating body, the temperature sensor is arranged in the temperature measuring section, and the heating element is arranged in the temperature measuring section; the test device includes an insulation pad, which is arranged between the fixed section and the base.

8. The testing device according to claim 7, characterized in that: The testing device includes a thermal insulation member, which has a first thermal insulation section and a second thermal insulation section. The first thermal insulation section is provided with a accommodating space, and a partial structure of the fixed section is accommodated in the accommodating space. The second thermal insulation section is provided with a receiving groove connected to the accommodating space, and another partial structure of the fixed section is located between the groove wall of the receiving groove and the thermal insulation pad.

9. The testing device according to claim 8, characterized in that: A lead wire avoidance groove is provided on one side of the heat insulation member facing the temperature measuring bracket.

10. The testing device according to claim 7, characterized in that: The testing device includes a fastener, the fixing section is provided with a fastening hole, the inner peripheral wall of the fastening hole is formed with a second limiting step, the thermal insulation pad is provided with an avoidance hole, the fastener passes through the fastening hole and the avoidance hole and is screwed to the base, and a partial structure of the fastener abuts against the second limiting step for limiting.

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