Full-automatic inspection equipment and inspection method for wireless temperature measurement sensor

Abstract

The wireless temperature measurement sensor full-automatic inspection equipment comprises an outer machine shell, a hollowed-out frame is fixed to the top end of the outer machine shell, and hanging baskets used for containing a temperature measurement sensor to be inspected are arranged at the positions, on the two sides of the hollowed-out frame, of the top end of the outer machine shell. A lead screw lifting module used for controlling the Z-axis height of the hanging basket is arranged in the hollowed-out frame. The number of the three-cavity electric heating type oil grooves is two, heat conduction oil is injected into the three-cavity electric heating type oil grooves, and the two three-cavity electric heating type oil grooves are symmetrically installed in the outer machine shell. The combination of the bidirectional independent air volume control module and the refrigeration module is utilized, the temperature change in the two three-cavity electric heating type oil tanks can be effectively controlled by accurately adjusting the flow of cold air, the obvious temperature difference can be generated between the two oil tanks through the accurate temperature control mechanism, and the cooling effect is improved. And the response capability of the temperature measurement sensor to different temperature points is ensured, so that the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of full-automatic inspection of wireless temperature sensors, and specifically to a full-automatic inspection device and inspection method for wireless temperature sensors, which can realize the full-automatic inspection of the temperature measurement performance of a single wireless temperature sensor and the inspection of the temperature difference measurement performance of multiple temperature sensors. Background Art

[0002] The main function of the full-automatic inspection device for wireless temperature sensors is to judge the accuracy of the temperature measurement result of the wireless temperature sensor through a standardized temperature source and a high-precision measurement device, ensure that its measurement result is consistent with the actual temperature, and thus avoid problems such as data anomalies caused by temperature data deviation. The structure of the inspection device usually includes a standard temperature source, a temperature measurement device, a data acquisition system, a control and adjustment module, and a display and report generation module. The standard temperature source provides a reference temperature with known accuracy for calibration. The temperature measurement device monitors the actual temperature and compares it with the output value of the digital oil thermometer. The data acquisition system converts the measured data into an electronic signal for processing and recording. The control module automatically adjusts the temperature source to ensure temperature stability. The display module displays real-time data and generates a calibration report. The inspection device ensures accurate and reliable temperature through processes such as temperature matching, data acquisition and comparison, error analysis and adjustment; for example, an auxiliary inspection device for an oil-immersed transformer oil thermometer disclosed in the authorized announcement number CN220932224U, which includes a device body with a hollow interior and a single-chip microcomputer disposed inside the device body. A power supply module is provided inside the device body, and the single-chip microcomputer is electrically connected to the power supply module. A voltage output interface connected to the terminal block of the oil thermometer through a line, an analog quantity input interface connected to the temperature analog quantity output end of the oil thermometer through a line, a switch quantity input interface connected to the temperature action switch quantity contact of the oil thermometer through a line, and a temperature display screen electrically connected to the single-chip microcomputer are provided outside the device body. The voltage output interface is electrically connected to the power supply module, and the analog quantity input interface and the switch quantity input interface are both electrically connected to the single-chip microcomputer. It simultaneously connects each temperature action switch quantity contact of the oil thermometer to the auxiliary inspection device to replace the multimeter;

[0003] The existing full-automatic inspection technologies and equipment operation methods for wireless temperature sensors are basically the same, that is, the wireless temperature sensor elements to be inspected are immersed in an oil tank, and the temperature is increased through the heating elements and oil in the oil tank, and the temperature of the oil in the oil tank is reduced through a refrigeration system. However, in the process of its use, the refrigeration system only controls one oil tank for cooling, and it is difficult to apply it to the inspection device with two oil tanks. That is, when it is necessary to achieve two oil tanks or a large range of temperature changes, a single refrigeration system will be unable to cope. Specifically, when two oil tanks need to be controlled simultaneously and reach different temperatures or cooperate with each other for calibration, a single refrigeration system cannot meet the temperature control requirements of both oil tanks at the same time, resulting in an insignificant temperature difference fluctuation between the two oil tanks, thus affecting the accuracy of the inspection. Summary of the Invention

[0004] The object of the present invention is to provide a fully automatic inspection device and inspection method for wireless temperature measurement sensors. Two wireless temperature measurement sensor elements to be subjected to temperature inspection are placed in two hanging baskets, and a lead screw lifting module is used to control the two hanging baskets to be immersed into corresponding three-chamber electrothermal oil tanks respectively. When cooling the two three-chamber electrothermal oil tanks, the cold air generated by the refrigeration module enters the air blowing module and the two-way independent air volume control module. The two-way independent air volume control module can control the amount of cold air entering the two oil tanks. While the air blowing module is working, it can drive the liquid mixing structure in the three-chamber electrothermal oil tank to work, prompting the heat transfer oil to exchange heat with the cold air for cooling, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: A fully automatic inspection device for wireless temperature measurement sensors, comprising:

[0006] An elevation unit, a temperature control unit and a PLC controller;

[0007] The elevation unit includes an outer machine shell, a hollow frame located at the top of the outer machine shell, inspection hanging baskets arranged on both sides of the hollow frame, and a lead screw lifting module arranged inside the hollow frame for controlling the hanging baskets to move along the Z-axis. The hanging baskets are used to accommodate the temperature measurement sensors to be inspected;

[0008] The temperature control unit includes a frame fixed to the bottom of the outer machine shell, two three-chamber electrothermal oil tanks symmetrically installed inside the outer machine shell, a refrigeration module and an air blowing module installed inside the frame, and a two-way independent air volume control module installed at the top of the frame. The three-chamber electrothermal oil tank is filled with heat transfer oil and is provided with a liquid mixing structure for prompting the heat transfer oil to generate fluctuations and an oil tank temperature sensor for monitoring the temperature of the three-chamber electrothermal oil tank. The refrigeration module is used to generate cold air, the air blowing module is used to transport the cold air to the two-way independent air volume control module, and the two-way independent air volume control module is respectively connected to the two three-chamber electrothermal oil tanks through refrigeration air ducts to control the cold air flow entering the two three-chamber electrothermal oil tanks;

[0009] The PLC controller is electrically connected to the lead screw lifting module, the three-chamber electrothermal oil tank, the refrigeration module, the air blowing module and the two-way independent air volume control module, and is used to execute the following control logics:

[0010] a. Control the hanging baskets to immerse / withdraw from the three-chamber electrothermal oil tank through the lead screw lifting module;

[0011] b. Adjust the two-way independent air volume control module to make the two three-chamber electrothermal oil tanks generate a set temperature difference;

[0012] c. Based on the real-time temperature feedback from the oil tank temperature sensor, the PLC controller is used to control the air output of the bidirectional independent type air volume control module, so that the temperature difference in the oil tank reaches the preset value.

[0013] Further, the screw rod lifting module includes a suspension plate fixed to the top of the hollow frame, a screw rod body rotatably installed at the bottom end of the suspension plate, and a nut pair installed at one end of the threaded part on the surface of the screw rod body. A support platform is fixed on one outer wall of the nut pair, and convex parts are integrally formed on the front and rear outer walls of the support platform. A belt wheel servo drive unit for driving the screw rod body to rotate is installed at one end inside the hollow frame.

[0014] Further, the belt wheel servo drive unit includes a servo motor, a synchronous belt wheel, and a multi-wedge belt. The servo motor is installed on one side inside the hollow frame, the synchronous belt wheel is installed at the top end of the output shaft of the servo motor and the top end of the screw rod body, and the multi-wedge belt is installed between the two synchronous belt wheels.

[0015] Further, the hanging basket includes columns fixed to both sides of the bottom end of the convex part, a perforated iron basket installed at the bottom end of the two columns, and a flip cover hinged to the top end of the perforated iron basket through a hinge. A lock is installed on one side of the top end of the flip cover, and a circular through hole for the perforated iron basket to sink is provided on one side of the top end of the three-chamber electrothermal oil tank.

[0016] Further, the three-chamber electrothermal oil tank includes an oil tank fixed to one side inside the outer casing, and a cavity, a cold air chamber, and an oil liquid chamber provided inside the oil tank. The cold air chamber is communicated with the refrigeration air duct. The oil liquid chamber is used to accommodate heat-conducting oil. Heat insulation plates are installed at the openings of the cold air chamber and the oil liquid chamber to make the cold air chamber and the oil liquid chamber in a sealed state. The liquid mixing structure is arranged in the oil liquid chamber, and the circular through hole is arranged above the oil liquid chamber. The oil liquid chamber allows the perforated iron basket to sink into it through the circular through hole.

[0017] Further, an electric heating rod for heating the heat-conducting oil is installed on one side of the bottom of the oil tank. The input end of the electric heating rod is electrically connected to the output end of the PLC controller. A temperature sensor is installed on the other side of the bottom of the oil tank. The output end of the temperature sensor is electrically connected to the input end of the PLC controller.

[0018] Further, the refrigeration module includes a compressor installed on the inner wall of one side of the frame, an air-cooled condenser installed at the bottom end of the frame, and an expansion valve installed on the low-pressure side of the compressor. The expansion valve is located on the high-pressure side of the compressor. The refrigeration module further includes an evaporator installed on the inner wall of the other side of the frame. One end of the evaporator is connected to one end of the expansion valve. The air blowing module includes a support shell installed on the top of the evaporator and a through fan rotatably installed inside the support shell. A worm and gear double-shaft output reduction motor is installed on the outer wall of one side of the support shell, and the worm and gear double-shaft output reduction motor is used to drive the through fan and the liquid mixing structure to work.

[0019] Further, the bidirectional independent air volume control module includes a Z-shaped air box installed on the top of the support shell, electric push rods installed on the left and right outer walls of the Z-shaped air box, and a U-shaped baffle installed at the top end of the piston rod of the electric push rod. Rectangular air holes for air circulation are provided on the outer walls of the refrigeration air duct and the Z-shaped air box in contact with each other. The end of the U-shaped baffle extends into the Z-shaped air box and is used to block the rectangular air holes.

[0020] Further, the liquid mixing structure includes a stirring shaft rotatably installed inside the oil chamber and a belt pulley synchronous transmission structure installed at one end of the stirring shaft for connecting to the other output end of the worm and gear double-shaft output reduction motor.

[0021] A fully automatic inspection method for wireless temperature measurement sensors is applied to the fully automatic inspection equipment for transformer digital oil temperature gauges as described above. The method includes the following steps:

[0022] S101: Place the temperature sensing elements of two wireless temperature measurement sensors to be inspected into two hanging baskets respectively. Start the three-chamber electrothermal oil tank through the PLC controller so that the oil temperature in the three-chamber electrothermal oil tank reaches the preset standard temperature.

[0023] S102: Control the screw rod lifting module through the PLC controller to adjust the height of the hanging basket so that the hanging basket is immersed in the three-chamber electrothermal oil tank.

[0024] S103: Control the refrigeration module to generate cold air through the PLC controller. The cold air is sent into the bidirectional independent air volume control module by the air blowing module. The flow rate of the refrigeration air duct is distributed through the bidirectional independent air volume control module. A temperature difference is generated between the two three-chamber electrothermal oil tanks. The rotational power of the air blowing module is synchronously transmitted to the liquid mixing structure, so that the heat-conducting oil is stirred to enhance the heat exchange between the cold air and the heat-conducting oil.

[0025] S104: The oil tank temperature sensor senses the temperature fluctuation in the three-chamber electrothermal oil tank and feeds it back to the temperature sensor to be calibrated. The staff monitors the measurement and display results of the temperature sensor to be calibrated through the PLC controller according to the preset standard temperature range, and determines whether the temperature sensor to be calibrated is qualified based on the temperature difference between the temperature indication value of the temperature sensor to be calibrated and the actual temperature in the oil tank displayed by the oil tank temperature sensor.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: The automatic inspection equipment and inspection method for wireless temperature sensors make the inspection process of temperature sensors more efficient, accurate and automated through the cooperating structures such as the hanging basket, the screw rod lifting module, two three-chamber electrothermal oil tanks, the liquid mixing structure, the cold air duct, the refrigeration module, the cold air blowing module, and the bidirectional independent air volume control module. Among them, by using the combination of the bidirectional independent air volume control module and the refrigeration module, the temperature change in the two three-chamber electrothermal oil tanks can be effectively controlled by precisely adjusting the flow rate of the cold air. This precise temperature control mechanism enables a significant temperature difference to be generated between the two oil tanks. The wireless temperature sensor needs to be inspected under different temperature conditions. By artificially creating temperature differences, the response ability of the temperature sensor to different temperature points can be ensured, thereby improving the accuracy of the inspection. This inspection method has more advantages than the traditional single temperature point inspection method, can cover a wider range of usage scenarios, and ensure that the transformer oil temperature gauge can accurately reflect the oil temperature change in actual applications.

[0027] By using one refrigeration module and controlling the amount of cold air entering the two oil tanks through the bidirectional independent air volume control module, the cooling process of the two three-chamber electrothermal oil tanks can be independently controlled by one refrigeration module. At the same time, by precisely controlling the cold air flow rate and the liquid mixing structure in the three-chamber electrothermal oil tank, the temperature changes in the two oil tanks can be ensured to be more uniform and stable. In this process, the flow of cold air is combined with the flow of heat-conducting oil to ensure the uniform distribution of the oil temperature, making the temperature change in each oil tank smoother, avoiding the phenomenon of too fast temperature drop or unevenness, and helping to accurately inspect the temperature sensor during low-temperature or high-temperature limit tests. In addition, in the specific application scenario of power equipment temperature monitoring, sometimes 2 (or more) temperature sensors are needed to monitor the temperature difference of different parts; the technical solution can also conveniently achieve the rapid inspection of the temperature difference of 2 (or more) temperature sensors.

[0028] The design of multiple refrigeration systems requires more components such as cooling media, pipelines, control systems, etc., which makes the equipment bulky and heavy, and in case of equipment failure, the maintenance work is cumbersome and costly. However, through the bidirectional independent air volume control module, the blowing module and the refrigeration air duct connected to the oil tank, the refrigeration structure of the equipment is simplified, not only reducing the number of cooling devices, but also making the equipment more compact, effectively avoiding the energy consumption waste of multiple refrigeration devices working simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front view structural schematic diagram of the present invention;

[0030] Figure 2 is a three-dimensional structural schematic of the present invention Figure 1 ;

[0031] Figure 3 is a three-dimensional structural schematic of the present invention Figure 2 ;

[0032] Figure 4 is a three-dimensional sectional structural schematic of the outer casing of the present invention Figure 1 ;

[0033] Figure 5 is a three-dimensional sectional structural schematic of the outer casing of the present invention Figure 2 ;

[0034] Figure 6 is a three-dimensional structural schematic diagram of the three-chamber electrothermal oil tank of the present invention;

[0035] Figure 7 is a three-dimensional structural schematic diagram of the lead screw lifting module and the hanging basket according to the second embodiment of the present invention;

[0036] Figure 8 is a three-dimensional structural schematic diagram of the three-chamber electrothermal oil tank according to the third embodiment of the present invention;

[0037] Figure 9 is a three-dimensional structural schematic of the refrigeration module and the air blowing module according to the third embodiment of the present invention Figure 1 ;

[0038] Figure 10 is a three-dimensional structural schematic of the refrigeration module and the air blowing module according to the third embodiment of the present invention Figure 2 ;

[0039] Figure 11 is a three-dimensional structural schematic diagram of the bidirectional independent type air volume control module according to the fourth embodiment of the present invention;

[0040] Figure 12 is a three-dimensional sectional structural schematic diagram of the three-chamber electrothermal oil tank according to the fourth embodiment of the present invention;

[0041] Figure 13 is a three-dimensional structural schematic diagram of the fuel tank of the present invention after the heat insulation board is removed according to the fourth embodiment.

[0042] In the figure: 1, outer casing; 2, hollow frame; 3, PLC controller; 4, screw rod lifting module; 401, hanging plate; 402, belt pulley servo drive unit; 403, screw rod body; 404, support platform; 405, convex part; 5, hanging basket; 501, upright column; 502, perforated iron basket; 503, flip cover; 6, three-chamber electrothermal oil tank; 601, oil tank; 602, cavity; 603, cold air cavity; 604, oil liquid cavity; 605, heat insulation board; 606, electric heating rod; 607, temperature sensor; 7, frame; 8, refrigeration module; 801, compressor; 802, air-cooled condenser; 803, expansion valve; 804, evaporator; 9, air blowing module; 901, support shell; 902, through fan; 10, worm and gear double-shaft output reduction motor; 11, two-way independent air volume control module; 1101, Z-shaped air box; 1102, electric push rod; 1103, U-shaped baffle; 1104, rectangular air hole; 12, refrigeration air duct; 13, liquid mixing structure; 1301, stirring shaft; 1302, belt pulley synchronous drive structure. Specific implementation mode

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1, which is given by Figures 1 to 6 The present invention includes an outer casing 1. A hollow frame 2 is fixed to the top end of the outer casing 1. And hanging baskets 5 for accommodating the temperature sensor elements of the oil temperature gauge to be inspected are arranged at the top ends of the outer casing 1 on both sides of the hollow frame 2. A screw rod lifting module 4 for controlling the Z-axis height of the hanging basket 5 is arranged inside the hollow frame 2;

[0045] A three-chamber electrothermal oil tank 6, the heating temperature range of the three-chamber electrothermal oil tank is -30°C to 180°C, the temperature fluctuation degree ≤ ±0.01°C / 10min, the horizontal temperature field ≤ 0.01°C, the vertical temperature field ≤ 0.02°C. There are two three-chamber electrothermal oil tanks 6 and the inside of the three-chamber electrothermal oil tank 6 is filled with heat-conducting oil. The two three-chamber electrothermal oil tanks 6 are symmetrically installed inside the outer casing 1. A liquid mixing structure 13 for causing the heat-conducting oil to fluctuate is arranged inside the three-chamber electrothermal oil tank 6;

[0046] The frame 7 is fixed to the bottom of the outer casing 1 and is located below the two three-chamber electrothermal oil tanks 6. At one end inside the frame 7, a refrigeration module 8 is installed. At the other end inside the frame 7, an air-blowing module 9 for blowing cold air upward is installed. The air-blowing module 9 and the liquid mixing structure 13 are in power connection. At the top of the frame 7, a two-way independent air volume control module 11 connected to the air-blowing module 9 is installed. On both sides of the bottom end of the three-chamber electrothermal oil tank 6, a refrigeration air duct 12 is installed. The air inlet of the refrigeration air duct 12 is communicated with the air outlet of the two-way independent air volume control module 11. The two-way independent air volume control module 11 is used to control the amount of cold air entering the two three-chamber electrothermal oil tanks 6;

[0047] The PLC controller 3 is installed on the outer wall of one side of the hollow frame 2. The output end of the PLC controller 3 is electrically connected to the input ends of the screw rod lifting module 4, the three-chamber electrothermal oil tank 6, the refrigeration module 8, the air-blowing module 9, and the two-way independent air volume control module 11.

[0048] A full-automatic inspection method for wireless temperature sensors in this embodiment, such as the above full-automatic inspection equipment for wireless temperature sensors, includes the following steps:

[0049] S101: Correctly place the temperature sensing elements of the two wireless temperature sensors to be inspected in the two hanging baskets 5, ensure that the temperature sensing elements are firmly installed on the hanging baskets 5, ensure that the equipment can work normally. After confirmation, start the PLC controller 3 and start the preliminary heating process of the equipment to ensure that the oil temperature in the three-chamber electrothermal oil tank 6 reaches the preset standard temperature;

[0050] S102: After the equipment is debugged, the staff adjusts the height of the hanging basket 5 through the PLC controller 3 and the screw rod lifting module 4, so that the hanging basket 5 is immersed in the three-chamber electrothermal oil tank 6, ensuring that the position of each temperature sensing element in the three-chamber electrothermal oil tank 6 can correspond to the required temperature change;

[0051] S103: Precisely adjust the flow rate of cold air through the two-way independent air volume control module 11, so as to create a temperature difference between the two three-chamber electrothermal oil tanks 6. That is, the staff generates cold air by starting the refrigeration module 8, and the cold air is sent into the two-way independent air volume control module 11 by the air-blowing module 9. At this time, the PLC controller 3 adjusts the flow rates of the two cold air streams according to the preset and required temperature difference, so that the temperature of one three-chamber electrothermal oil tank 6 drops rapidly, and the other three-chamber electrothermal oil tank 6 remains at a higher temperature. The rotational power of the air-blowing module 9 will also be synchronously transmitted to the liquid mixing structure 13, and the liquid mixing structure 13 stirs the heat-conducting oil, so as to force the cold air to perform efficient heat exchange with the heat-conducting oil liquid to reduce the temperature of the three-chamber electrothermal oil tank 6;

[0052] S104: During this process, the oil temperatures in the two three-chamber electrothermal oil tanks 6 start to change. Due to the effect of cold air, the temperature of one oil tank drops, while the other remains at a relatively high temperature. At this time, the temperature sensing element senses the temperature fluctuation in the oil tank and feeds it back to the transformer oil temperature gauge. According to the preset standard temperature range, the staff monitors the temperature response of the temperature sensing element of the oil temperature gauge through the PLC controller 3. If the displayed temperature of the temperature sensing element differs significantly from the actual temperature in the oil tank, it indicates that there is an error in the oil temperature gauge, and the staff needs to perform further calibration. If the inspection result shows that the temperature error is within the acceptable range, the staff can complete the inspection process.

[0053] Embodiment 2 is given on the basis of Embodiment 1 and consists of Figure 5 and Figure 7 The screw rod lifting module 4 includes a suspension plate 401 fixed to the top of the hollow frame 2, a screw rod body 403 rotatably installed at the bottom end of the suspension plate 401, and a nut pair installed at the threaded part at one end of the surface of the screw rod body 403. A support platform 404 is fixed to the outer wall of one side of the nut pair, and convex portions 405 are integrally formed on the front and rear outer walls of the support platform 404. A pulley servo drive unit 402 for driving the rotation of the screw rod body 403 is installed at one end inside the hollow frame 2. The pulley servo drive unit 402 consists of a servo motor, synchronous belt pulleys, and a multi-wedge belt. The servo motor is installed on one side inside the hollow frame 2, the synchronous belt pulley is installed at the top end of the output shaft of the servo motor and the top end of the screw rod body 403, and the multi-wedge belt is installed between the two synchronous belt pulleys;

[0054] The hanging basket 5 includes columns 501 fixed to both sides of the bottom end of the convex portion 405, a perforated iron basket 502 installed at the bottom ends of the two columns 501, and a flip cover 503 hingedly installed at the top end of the perforated iron basket 502 through a hinge. A lock is installed on one side of the top end of the flip cover 503. A circular through-hole for the perforated iron basket 502 to sink is provided on one side of the top end of the three-chamber electrothermal oil tank 6. The staff places the wireless temperature measurement sensor element to be inspected into the perforated iron basket 502 and closes the flip cover 503. The flip cover 503 is firmly connected to the perforated iron basket 502 by using the lock at the top end of the flip cover 503. At this time, the perforated iron basket 502 accommodates and supports the wireless temperature measurement sensor element to be inspected. Placing the perforated iron basket 502 in the oil tank can ensure good contact between the temperature sensing element and the oil. The columns 501 are connected to the screw rod lifting module 4 to ensure the depth and position of the perforated iron basket 502 and the temperature sensing element immersed in the oil, and avoid measurement errors caused by improper positions;

[0055] When the screw rod lifting module 4 is working, the servo motor in the belt pulley servo drive unit 402 receives the control signal from the PLC controller 3 and rotates forward or reversely according to the control signal of the PLC controller 3. Then, the belt pulley servo drive unit 402 drives the screw rod body 403 to rotate. The screw rod body 403 drives the support platform 404, the convex part 405, the column 501, and the perforated iron basket 502 to move down or up through the nut pair. By adjusting the lifting height of the column 501 and the perforated iron basket 502, it is ensured that the temperature sensing element can be accurately positioned in the three-chamber electrothermal oil tank 6 according to different temperature control regions, and through precise adjustment, it is ensured that each movement of the temperature sensing element in the oil tank reaches the expected height and provides a smooth lifting process, avoiding errors caused by too fast or too slow lifting speeds.

[0056] Embodiment 3, based on Embodiment 2, is given by Figure 8 、 Figure 9 and Figure 10 The three-chamber electrothermal oil tank 6 includes an oil tank 601 fixed on one side inside the outer machine shell 1, and a cavity 602, a cold air cavity 603, and an oil liquid cavity 604 arranged inside the oil tank 601. The cold air cavity 603 is in communication with the refrigeration air duct 12. The oil liquid cavity 604 is used to accommodate heat-conducting oil. Heat insulation plates 605 are installed at the openings of the cold air cavity 603 and the oil liquid cavity 604. The heat insulation plates 605 are used to make the cold air cavity 603 and the oil liquid cavity 604 in a sealed state. The heat insulation plates 605 also isolate the oil liquid and cold air between the two oil tanks 601, reducing the heat exchange amount between the two oil tanks 601;

[0057] The liquid mixing structure 13 is arranged in the oil liquid cavity 604. A circular through hole is arranged above the oil liquid cavity 604. The oil liquid cavity 604 allows the perforated iron basket 502 to sink into it through the circular through hole;

[0058] An electric heating rod 606 for heating the heat-conducting oil is installed on one side of the bottom of the oil tank 601. The input end of the electric heating rod 606 is electrically connected to the output end of the PLC controller 3. A temperature sensor 607 is installed on the other side of the bottom of the oil tank 601. The output end of the temperature sensor 607 is electrically connected to the input end of the PLC controller 3;

[0059] The refrigeration module 8 includes a compressor 801 installed on the inner wall of one side of the frame 7, an air-cooled condenser 802 installed at the bottom end of the frame 7, and an expansion valve 803 installed on the low-pressure side of the compressor 801. The expansion valve 803 is located on the high-pressure side of the compressor 801. The refrigeration module 8 also includes an evaporator 804 installed on the inner wall of the other side of the frame 7. One end of the evaporator 804 is connected to one end of the expansion valve 803;

[0060] The compressor 801 sucks in the low-pressure gaseous refrigerant in the evaporator 804 and compresses it, increasing its pressure and temperature to form a high-temperature and high-pressure gas. Then, these high-temperature and high-pressure gases enter the air-cooled condenser 802, where heat is released and cooled through heat exchange with the external environment, and finally becomes a liquid refrigerant. Subsequently, when the liquid refrigerant passes through the expansion valve 803, the pressure drops suddenly, the temperature decreases significantly, and part of it is transformed into a low-temperature and low-pressure gaseous refrigerant. This low-temperature and low-pressure refrigerant enters the evaporator 804. Inside the evaporator 804, it absorbs the heat of the surrounding air and partially evaporates into a gas. The air whose heat has been absorbed has its temperature decreased, forming cold air. The refrigerant that has completely evaporated in the evaporator 804 is then sucked back into the compressor 801 in the form of a low-pressure gas, entering the next cycle. Through this cycle process, the refrigeration system can continuously transfer heat from the target area, achieving the purpose of cooling and generating cold air;

[0061] The air-blowing module 9 includes a support shell 901 installed at the top of the evaporator 804 and a through-fan 902 rotatably installed inside the support shell 901. A worm-gear and worm double-shaft output reduction motor 10 is installed on one outer wall of the support shell 901, and the worm-gear and worm double-shaft output reduction motor 10 is used to drive the through-fan 902 and the liquid mixing structure 13 to work;

[0062] When the air-blowing module 9 is working, the worm-gear and worm double-shaft output reduction motor 10 drives the through-fan 902 in the support shell 901 to rotate, then the cold air is quickly and efficiently blown into the two-way independent air volume control module 11, the refrigeration air duct 12, and the oil tank through the through-fan 902, enhancing the cooling effect and ensuring that the temperature of the oil tank can reach the set requirements in a short time. During this process, the three-chamber electrothermal oil tank 6 effectively promotes the heat exchange between the cold air and the oil liquid, reduces the phenomenon of uneven temperature, and improves the temperature control accuracy;

[0063] The refrigeration module 8 generates cold air and sends it into the two-way independent air volume control module 11 and the refrigeration air duct 12 through the air-blowing module 9. The temperature of the three-chamber electrothermal oil tank 6 is adjusted through the flow of cold air. Especially when simulating a low-temperature environment, the temperature of the three-chamber electrothermal oil tank 6 can be quickly reduced to meet the inspection requirements of the wireless temperature measurement sensor.

[0064] Embodiment 4, on the basis of Embodiment 3, by Figure 11 、 Figure 12 and Figure 13Given that the bidirectional independent air volume control module 11 includes a Z-shaped air box 1101 installed at the top of the support shell 901, electric push rods 1102 installed on the left and right outer walls of the Z-shaped air box 1101, and a U-shaped baffle 1103 installed at the top of the piston rod of the electric push rod 1102. Rectangular air holes 1104 for air circulation are provided on the outer walls of the refrigeration air duct 12 and the Z-shaped air box 1101 in contact with each other. The end of the U-shaped baffle 1103 extends into the interior of the Z-shaped air box 1101 and is used to block the rectangular air holes 1104. The cold air in the Z-shaped air box 1101 enters the refrigeration air duct 12 through the rectangular air holes 1104, and then the cold air enters the cold air cavity 603 of the fuel tank 601 through the refrigeration air duct 12. At this time, the cold air surrounds the outside of the oil chamber 604 and exchanges heat with the heat-conducting oil in the oil chamber 604, causing the heat-conducting oil to cool down;

[0065] When the through fan 902 blows cold air upward, the cold air is blown into the Z-shaped air box 1101 and is located in the upper chamber of the Z-shaped air box 1101. At this time, the staff controls the electric push rod 1102 at the corresponding position through the PLC controller 3. The electric push rod 1102 drives the U-shaped baffle 1103 to move away from or close to the Z-shaped air box 1101, so that the U-shaped baffle 1103 blocks the rectangular air holes 1104. At this time, the ventilation area of the rectangular air holes 1104 is controlled, so that the flow rate of the cold air entering the refrigeration air duct 12 from the rectangular air holes 1104 can be adjusted, thereby realizing the independent control of the cold air of the two three-chamber electrothermal oil tanks 6. It creates a stable temperature difference between the two three-chamber electrothermal oil tanks 6 and accurately adjusts the temperature difference in the three-chamber electrothermal oil tank 6 to ensure that the temperature distribution of the oil tank meets the inspection requirements;

[0066] The liquid mixing structure 13 includes a stirring shaft 1301 rotatably installed inside the oil chamber 604 and a belt pulley synchronous transmission structure 1302 installed at one end of the stirring shaft 1301 for connecting to the other output end of the worm and gear dual-axis output reduction motor 10;

[0067] When the worm and gear dual-axis output reduction motor 10 drives the through fan 902 to rotate, a part of the rotational power of the worm and gear dual-axis output reduction motor 10 will be transmitted to the stirring shaft 1301 through the belt pulley synchronous transmission structure 1302. The stirring shaft 1301 enhances the heat exchange between the oil and the cold air, avoids the uneven temperature distribution in the oil tank, improves the accuracy of temperature inspection, and the rotation of the stirring shaft 1301 helps to ensure that the temperature in the oil tank can reach the set value quickly and stably, improving the inspection efficiency.

[0068] In the use of the embodiment of the present invention, first, the temperature sensing elements of two wireless temperature sensors to be tested are correctly placed in two hanging baskets 5, ensuring that the temperature sensing elements are firmly installed with the hanging baskets 5. The hanging baskets 5 should be ensured to be able to freely lift in the three-chamber electrothermal oil tank 6, and it is confirmed that the refrigeration module 8, the air blowing module 9, the two-way independent type air volume control module 11 and the cold air path are unobstructed, ensuring that the equipment can work normally. After confirmation, the PLC controller 3 is started, and the preliminary heating process of the equipment is started to ensure that the oil temperature in the three-chamber electrothermal oil tank 6 reaches the preset standard temperature. After the equipment is debugged, the staff adjusts the height of the hanging basket 5 through the PLC controller 3 and the screw rod lifting module 4. According to different inspection requirements, the temperature sensing elements in the hanging basket 5 are accurately placed in the two three-chamber electrothermal oil tanks 6 until the hanging baskets 5 and the temperature sensing elements are completely immersed in the heat-conducting oil, ensuring that the position of each temperature sensing element in the three-chamber electrothermal oil tank 6 can correspond to the required temperature change. When entering the next stage, the staff needs to accurately adjust the flow rate of the cold air through the two-way independent type air volume control module 11 to create a temperature difference between the two three-chamber electrothermal oil tanks 6. That is, the staff generates cold air by turning on the refrigeration module 8, and this part of the cold air is sent by the air blowing module 9 to the two-way independent type air volume control module 11. At this time, the PLC controller 3 adjusts the flow rates of the two cold air streams according to the preset and required temperature difference, so that the temperature of one three-chamber electrothermal oil tank 6 drops rapidly, and the other three-chamber electrothermal oil tank 6 remains at a higher temperature. That is, the cold air enters the refrigeration air duct 12 and the three-chamber electrothermal oil tank 6 after being controlled by the two-way independent type air volume control module 11. During this process, the rotational power of the air blowing module 9 is also synchronously transmitted to the liquid mixing structure 13. The liquid mixing structure 13 stirs the heat-conducting oil, so as to force the cold air to perform efficient heat exchange with the heat-conducting oil liquid to reduce the temperature of the three-chamber electrothermal oil tank 6. At this time, the temperature difference between the two three-chamber electrothermal oil tanks 6 begins to appear, and the temperature change in the three-chamber electrothermal oil tank 6 is also monitored in real time by the temperature sensor and fed back to the PLC controller 3. During this process, the oil temperatures in the two three-chamber electrothermal oil tanks 6 begin to change. The temperature of one oil tank drops due to the action of the cold air, while the other remains at a higher temperature. At this time, the temperature sensing elements sense the temperature fluctuations in the oil tank and feed them back to the transformer oil temperature gauge. The staff monitors the temperature response of the temperature sensing elements of the oil temperature gauge through the PLC controller 3 according to the preset standard temperature range. If the displayed temperature of the temperature sensing element is quite different from the actual temperature in the oil tank, it means that there is an error in the wireless temperature sensor, and the staff needs to perform further calibration. If the inspection result shows that the temperature error is within the acceptable range, the staff can complete the inspection process. When the inspection result reaches the predetermined standard, the staff can gradually turn off the equipment.

[0069] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0070] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless temperature sensor fully automatic inspection device, characterized in that: It includes a lifting unit, a temperature control unit and a PLC controller (3); The lifting unit comprises an outer casing (1), a hollow frame (2) located at the top of the outer casing (1), an inspection hanging basket (5) arranged on both sides of the hollow frame (2), and a screw lifting module (4) arranged inside the hollow frame (2) for controlling the hanging basket (5) to move along the Z axis, wherein the hanging basket is used to accommodate a temperature sensor to be inspected; The temperature control unit comprises a frame (7) fixed to the bottom of the outer casing (1), two three-cavity electric heating oil tanks (6) symmetrically installed inside the outer casing (1), a refrigeration module (8) and a blower module (9) installed inside the frame (7), and a two-way independent air volume control module (11) installed on the top of the frame (7); the three-cavity electric heating oil tank (6) is filled with heat transfer oil and is provided with a mixing liquid structure (13) for causing the heat transfer oil to fluctuate, and an oil tank temperature sensor (607) for monitoring the temperature of the three-cavity electric heating oil tank (6); the refrigeration module (8) is used to generate cold air, and the blower module (9) is used to transport the cold air to the two-way independent air volume control module (11); the two-way independent air volume control module (11) is connected to the two three-cavity electric heating oil tanks (6) through a refrigeration air duct (12) to control the flow of cold air entering the two three-cavity electric heating oil tanks (6); The PLC controller (3) is electrically connected to the screw lifting module (4), the three-chamber electric heating oil tank (6), the refrigeration module (8), the air blowing module (9), and the two-way independent air volume control module (11).

2. The fully automatic inspection device for wireless temperature sensors according to claim 1 is characterized in that: The screw lifting module (4) comprises a hanging plate (401) fixed on the top of the hollow frame (2), a screw body (403) rotatably mounted at the bottom end of the hanging plate (401), and a nut pair mounted at a threaded portion at one end of the surface of the screw body (403); a support platform (404) is fixed on an outer wall of one side of the nut pair, and a protrusion (405) is integrally formed on the front and rear outer walls of the support platform (404); and a pulley servo drive unit (402) for driving the screw body (403) to rotate is installed at one end of the hollow frame (2).

3. The fully automatic inspection device for wireless temperature sensors according to claim 2 is characterized in that: The pulley servo drive unit (402) comprises a servo motor, a synchronous pulley and a multi-V belt, wherein the servo motor is mounted on one side inside the hollow frame (2), the synchronous pulley is mounted on the top end of the output shaft of the servo motor and the top end of the screw body (403), and the multi-V belt is mounted between the two synchronous pulleys.

4. The fully automatic inspection device for wireless temperature sensors according to claim 2 is characterized in that: The hanging basket (5) comprises columns (501) fixed on both sides of the bottom end of the raised portion (405), a perforated iron basket (502) installed at the bottom ends of the two columns (501), and a flip cover (503) hingedly installed at the top end of the perforated iron basket (502) through a hinge, a lock buckle is installed on one side of the top end of the flip cover (503), and a circular through hole for the perforated iron basket (502) to sink is provided on one side of the top end of the three-chamber electric heating oil tank (6).

5. The fully automatic inspection device for wireless temperature sensors according to claim 4 is characterized in that: The three-chamber electric heating oil tank (6) comprises an oil tank (601) fixed to one side of the interior of the outer casing (1) and a cavity (602), a cold air cavity (603) and an oil-liquid cavity (604) arranged inside the oil tank (601); the cold air cavity (603) and the refrigeration air duct (12) are interconnected; the oil-liquid cavity (604) is used to contain heat-conducting oil; the openings of the cold air cavity (603) and the oil-liquid cavity (604) are provided with heat insulation plates (605); the heat insulation plates (605) are used to keep the cold air cavity (603) and the oil-liquid cavity (604) in a sealed state; the mixing liquid structure (13) is arranged in the oil-liquid cavity (604); the circular through hole is arranged above the oil-liquid cavity (604); and the perforated iron basket (502) is allowed to sink into the oil-liquid cavity (604) through the circular through hole.

6. The fully automatic inspection device for wireless temperature sensors according to claim 5 is characterized in that: An electric heating rod (606) for heating the heat-conducting oil is installed on one side of the bottom of the oil tank (601), and the input end of the electric heating rod (606) is electrically connected to the output end of the PLC controller (3). A temperature sensor (607) is installed on the other side of the bottom of the oil tank (601), and the output end of the temperature sensor (607) is electrically connected to the input end of the PLC controller (3).

7. The fully automatic inspection device for wireless temperature sensors according to claim 5 is characterized in that: The refrigeration module (8) comprises a compressor (801) mounted on the inner wall of one side of the frame (7), an air-cooled condenser (802) mounted at the bottom of the frame (7), and an expansion valve (803) mounted on the low-pressure side of the compressor (801), wherein the expansion valve (803) is located on the high-pressure side of the compressor (801); the refrigeration module (8) further comprises an evaporator (804) mounted on the inner wall of the other side of the frame (7), wherein one end of the evaporator (804) and one end of the expansion valve (803) are connected to each other; the air blowing module (9) comprises a support shell (901) mounted on the top of the evaporator (804) and a through-type fan (902) rotatably mounted inside the support shell (901); a worm gear dual-shaft output reduction motor (10) is mounted on the outer wall of one side of the support shell (901), and the worm gear dual-shaft output reduction motor (10) is used to drive the through-type fan (902) and the liquid mixing structure (13) to work.

8. The fully automatic inspection device for wireless temperature sensors according to claim 7 is characterized in that: The bidirectional independent air volume control module (11) comprises a Z-shaped bellows (1101) mounted on the top of the support shell (901), an electric push rod (1102) mounted on the left and right outer walls of the Z-shaped bellows (1101), and a U-shaped baffle (1103) mounted on the top of the piston rod of the electric push rod (1102). The outer walls where the refrigeration air duct (12) and the Z-shaped bellows (1101) are in contact are both provided with rectangular air holes (1104) for air circulation. The end of the U-shaped baffle (1103) extends into the interior of the Z-shaped bellows (1101) and is used to shield the rectangular air holes (1104).

9. The fully automatic inspection device for wireless temperature sensors according to claim 7 is characterized in that: The liquid mixing structure (13) comprises a stirring shaft (1301) rotatably mounted inside the oil chamber (604) and a pulley synchronous transmission structure (1302) mounted on one end of the stirring shaft (1301) and used to be connected to the other output end of the worm gear dual-axis output reduction motor (10).

10. A fully automatic inspection method for wireless temperature sensors, applied to the fully automatic inspection device for digital oil thermometers for pressure transmitters as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: S101: placing the temperature sensing elements of two wireless temperature sensors to be tested in two hanging baskets (5) respectively, and starting the three-chamber electric heating oil tank (6) through the PLC controller (3) so that the oil temperature in the three-chamber electric heating oil tank (6) reaches a preset standard temperature; S102: Controlling the screw lifting module (4) through the PLC controller (3) to adjust the height of the hanging basket (5) so that the hanging basket (5) is immersed in the three-chamber electric heating oil tank (6); S103: The refrigeration module (8) is controlled by the PLC controller (3) to generate cold air, and the cold air is sent to the two-way independent air volume control module (11) by the air blowing module (9). The flow of the refrigeration air duct (12) is distributed by the two-way independent air volume control module (11), and the two three-chamber electric heating oil tanks (6) generate a temperature difference. The rotation power of the air blowing module (9) is synchronously transmitted to the mixing structure (13), so that the heat transfer oil is stirred to enhance the heat exchange between the cold air and the heat transfer oil; S104: The oil tank temperature sensor (607) senses the temperature fluctuation in the three-chamber electric heating oil tank (6) and feeds back to the temperature sensor being calibrated. The staff monitors the measurement display result of the calibrated temperature sensor through the PLC controller (3) according to the preset standard temperature range, and determines whether the calibrated temperature sensor is qualified based on the difference between the temperature indication of the calibrated temperature sensor and the actual temperature in the oil tank displayed by the oil tank temperature sensor (607).

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