Temperature sensor durability test device used between high-temperature tank and low-temperature tank

Abstract

The utility model relates to a durability test device for a temperature sensor between high and low temperature tanks. The durability test device comprises a box body provided with a workbench, a first thermostatic bath, a second thermostatic bath, a swing arm assembly, a tray, a power device, a detection device and a controller, the temperature sensor is fixed in the tray, constant-temperature liquid is stored in the first constant-temperature groove and the second constant-temperature groove, and the detection device comprises a first proximity switch and a second proximity switch. The swing arm assembly comprises a front swing arm and a rear swing arm; the two sides of the tray are rotationally connected with the front swing arm and the rear swing arm respectively; the axis of the transmission shaft and the axis of the rotating shaft are parallel and staggered. The power device comprises a gear motor and a coupler. The gear motor, the first proximity switch and the second proximity switch are respectively in signal connection with the controller; the device has the beneficial effects that the temperature sensor is repeatedly soaked in the two constant-temperature tanks through the tray, the swing arm and the gear motor, the soaking time in the constant-temperature tanks and the time between the constant-temperature tanks are adjustable, and the durability test of the temperature sensor is realized.

Description

Technical Field

[0001] This application relates to the field of sensor testing equipment, and in particular to a durability testing device for temperature sensors used in high and low temperature baths. Background Technology

[0002] Temperature sensors are key components of heat meters. To assess the reliability of temperature sensors, the national standard GB / T 32224-2020 "Heat Meters" requires temperature sensors to undergo 4000 cycles of high and low temperature durability testing. The test requires the temperature sensor to be placed in the high and low temperature baths for 30 seconds each, and the switching time between the temperature baths to be no more than 4 seconds.

[0003] However, the high frequency of switching makes manual switching and data recording cumbersome. To achieve automation, convenience, and adaptability in testing, it is necessary to design a device capable of automatically completing the durability test of temperature sensors, realizing an automated and reliable device for the durability testing of heat meter temperature sensors. Currently, there are very few devices that can achieve automated durability testing in this specific field, and they are expensive, cumbersome to operate, and have redundant switching mechanisms that require further optimization.

[0004] Among existing patents, application number 202220046454.2, entitled "Portable Flow Meter Temperature Sensor Durability Testing Device," discloses a device including a support frame and a constant temperature bath located below the support frame. The device is characterized by a positioning slide rail on the support frame, with a sliding plate slidably connected to the positioning slide rail. A vertical cylinder is mounted on the sliding plate, and a temperature sensor is mounted on the cylinder rod of the vertical cylinder. A horizontal cylinder is also mounted on the support frame, with its cylinder seat fixed to the support frame. The cylinder rod of the horizontal cylinder is connected to the sliding plate, causing the sliding plate to move left and right along the positioning slide rail. This device requires the interaction of the horizontal and vertical cylinders to move the sensor, necessitates an air source, and has a complex structure.

[0005] The publication number is CN104198089A; the title is "A Durability Testing Device and Method for a Heat Meter Temperature Sensor." The device includes: a constant-temperature water bath, equipped with a heating device, a cooling device, and a stirrer; a constant-temperature zone within the water bath, and a stirring zone and a working zone within that zone, with the stirrer located in the stirring zone; two insulated water tanks for storing high and low temperature water for the temperature sensor durability test, one of which contains a heating module; the stirring zone and working zone are connected to the two insulated water tanks respectively; an automatic control device for controlling the pumping and draining of water from the constant-temperature water bath to the insulated water tanks, and the start and stop of the stirrer in the constant-temperature water bath; and a temperature measurement and control device for measuring the water temperature in the constant-temperature water bath and the insulated water tanks, and controlling the start and stop of heating or cooling according to settings. However, the method by which the sensor enters the constant-temperature water bath is not disclosed, making the process somewhat incomplete. Utility Model Content

[0006] The purpose of this invention is to provide a durability testing device for temperature sensors in high and low temperature baths, which is easy to operate, has a simple structure, and provides stable durability testing for temperature sensors.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] A durability testing device for a temperature sensor in a high and low temperature bath includes a housing with a worktable, a first and second constant temperature bath installed inside the housing, a swing arm assembly installed on the worktable, a tray installed on the swing arm assembly, a power device for driving the swing arm assembly to swing, a detection device for detecting the position of the swing arm assembly, and a controller. The temperature sensor is fixed in the tray. The first and second constant temperature baths are each provided with slots adapted to the tray. The controller is connected to the first constant temperature bath, the second constant temperature bath, the power device, and the detection device.

[0009] Furthermore, both the first and second constant temperature baths contain liquids at a constant temperature, and the bottom surface of the tray is provided with a liquid passage hole, with the temperature sensor immersed in the liquid.

[0010] Furthermore, a support plate is provided on the workbench, and the detection device includes a first proximity switch and a second proximity switch mounted on the support plate; the first proximity switch and the second proximity switch are respectively connected to the controller signal.

[0011] The first proximity switch is used to detect whether the tray on the swing arm assembly is in contact with the slot on the second thermostatic bath.

[0012] The second proximity switch is used to detect whether the tray on the swing arm assembly is in contact with the slot on the first thermostatic bath.

[0013] Furthermore, the swing arm assembly includes a front swing arm and a rear swing arm, one end of which are rotatably connected to the worktable; the two sides of the tray are rotatably connected to the other ends of the front swing arm and the rear swing arm, respectively.

[0014] Furthermore, the workbench is provided with a front support and a rear support; the front swing arm is rotatably connected to the front support via a rotating shaft; the rear swing arm is rotatably connected to the rear support via a transmission shaft; the transmission shaft is connected to the power device; the axis of the transmission shaft is parallel to and offset from the axis of the rotating shaft.

[0015] Furthermore, a reinforcing rod is provided between the front swing arm and the rear swing arm, with both ends of the reinforcing rod rotatably connected to the front swing arm and the rear swing arm, respectively.

[0016] Furthermore, the power unit includes a base fixedly connected to the worktable, a geared motor fixedly connected to the base, and a coupling disposed between the geared motor and the transmission shaft;

[0017] The geared motor is connected to the controller via signal.

[0018] The beneficial effects of this application are:

[0019] This application uses a swing arm to drive the tray. The swing arm swings back and forth, and the tray drives the temperature sensor to be repeatedly immersed in two constant temperature baths to achieve the purpose of temperature sensor durability test.

[0020] The reinforcing rods ensure a secure connection between the two swing arms, reducing the stress on the swing arms and the tray, making the tray more stable when swinging.

[0021] By setting the rotating shaft to be parallel and offset from the drive shaft, the pallet is always kept horizontal and will not swing or become unstable during movement.

[0022] The control principle of this application is simple. Compared with the cylinder slide rail for controlling the y-axis and the positioning slide rail for the x-axis, the circular motion only needs to control the circular arc rotation angle to accurately control the movement of the switching device; there are fewer start and stop actions, reducing equipment wear. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this application;

[0024] Figure 2 This is a schematic diagram of the mounting structure of the swing arm assembly and the power unit.

[0025] Figure 3 This is a structural schematic diagram of the swing arm assembly and power unit;

[0026] Figure 4 for Figure 3 Enlarged view of point A;

[0027] The numbers on the map

[0028] 1-Box body, 11-Workbench;

[0029] 2-First thermostatic bath, 3-Tray, 4-Swing arm assembly, 5-Power unit, 6-Slot, 7-Second thermostatic bath;

[0030] 31-Liquid passage, 32-Hinged shaft;

[0031] 51-Rear control arm, 52-Front control arm, 53-Rear support, 54-Front support, 55-Reinforcing rod, 56-Support plate, 57-First proximity switch, 58-Second proximity switch;

[0032] 61-Coupling, 62-Base, 63-Gear motor, 64-Drive shaft. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] Example 1

[0035] like Figure 1 As shown in Figure 4,

[0036] A durability testing device for a temperature sensor in a high and low temperature bath includes a housing 1 with a workbench 11, a first constant temperature bath 2 and a second constant temperature bath 7 installed inside the housing 1, a swing arm assembly 4 installed on the workbench 11, a tray 3 installed on the swing arm assembly 4, a power unit 5 for driving the swing arm assembly 4 to swing, a detection device for detecting the position of the swing arm assembly 4, and a controller; the temperature sensor is fixed in the tray 3, and the first constant temperature bath 2 and the second constant temperature bath 7 are each provided with a slot 6 adapted to the tray 3, and the controller is connected to the first constant temperature bath 2, the second constant temperature bath 7, the power unit, and the detection device respectively.

[0037] Both the first constant temperature bath 2 and the second constant temperature bath 7 contain constant temperature liquids, and the slot 6 is filled with constant temperature liquids; the liquids immerse the temperature sensor through the liquid passage 31 on the bottom surface of the tray 3.

[0038] The workbench 11 is provided with a support plate 56, and the detection device includes a first proximity switch 57 and a second proximity switch 58 installed on the support plate 56; the first proximity switch 57 and the second proximity switch 58 are respectively connected to the controller signal.

[0039] The first proximity switch 57 is used to detect whether the tray 3 on the swing arm assembly 4 is in contact with the slot 6 on the second constant temperature bath 7; when the tray 3 swings to the left and enters the slot 6 of the second constant temperature bath 7, the proximity switch 57 sends a signal to the controller, and the controller sends a signal to the geared motor.

[0040] The second proximity switch 58 is used to detect whether the tray 3 on the swing arm assembly 4 is in contact with the slot 6 on the first constant temperature bath 2.

[0041] like Figure 3 As shown, the swing arm assembly 4 includes a front swing arm 52 and a rear swing arm 51, one end of which are rotatably connected to the worktable 11; the two sides of the tray 3 are rotatably connected to the other ends of the front swing arm 52 and the rear swing arm 51, respectively. Viewed vertically downwards, the hinge points of the tray 3 and the two swing arms are staggered. Thus, when the swing arms swing, the tray 3 is always in a horizontal state because it is staggered with the two swing arms.

[0042] The detailed structure is as follows: the worktable 11 is provided with a front support 54 and a rear support 53; both the front support 54 and the rear support 53 are fixed to the surface of the worktable 11 by bolts; the two supports are staggered to facilitate the turntable 3 connected to the two swing arms to remain horizontal.

[0043] The front swing arm 52 is rotatably connected to the front support 54 via a pivot.

[0044] The rear swing arm 51 is rotatably connected to the rear support 53 via a drive shaft 64;

[0045] The drive shaft 64 is connected to the power unit 5 in a transmission connection;

[0046] The axis of the drive shaft 64 is parallel to and offset from the axis of the rotating shaft to prevent the tray 3 from shaking when swinging.

[0047] like Figure 4 As shown, the rear swing arm 51 and one side of the tray 3 are rotatably connected by a hinge shaft 32, and the front swing arm 52 and the other side of the tray 3 are also rotatably connected by another hinge shaft 32. When viewed vertically downward, the axes of the two hinge shafts 32 are parallel and staggered, which prevents the tray 3 from swaying when swinging and ensures that the tray 3 is always in a horizontal state when the swing arm swings.

[0048] The power unit 5 includes a base 63 fixedly connected to the workbench 11, a reduction motor 62 fixedly connected to the base 63, and a coupling 61 disposed between the reduction motor 62 and the transmission shaft 64.

[0049] The geared motor 62 is connected to the controller signal.

[0050] Except for the drive shaft 64, which requires rolling bearings, all other rotating connections in this application can use low-cost sliding bearings.

[0051] The controller is equipped with a time module, and the immersion time of the temperature sensor in the first constant temperature bath 2 and the second constant temperature bath 7 is set in the controller.

[0052] The first proximity switch 57 is used to detect whether the tray 3 on the swing arm assembly 4 is in contact with the slot 6 on the second constant temperature bath 7; the second proximity switch 58 is used to detect whether the tray 3 on the swing arm assembly 4 is in contact with the slot 6 on the first constant temperature bath 2.

[0053] The specific usage process is as follows:

[0054] When tray 3 swings to the left and enters the slot 6 of the second constant temperature bath 7, proximity switch 57 sends a signal to the controller, which in turn sends a stop signal to the geared motor 62. When the soaking time reaches the set duration, the controller sends a reverse signal to the geared motor 62, and the two swing arms drive tray 3 to swing. When the second proximity switch 58 detects the rear swing arm 51, the controller sends a stop signal to the geared motor 62, and tray 3 enters the slot 6 of the first constant temperature bath 2. The constant temperature liquid soaks the temperature sensor through the liquid passage 31. When the soaking time reaches the set duration, the controller sends a start signal to the geared motor 62. This process is repeated, and the number of repetitions is determined according to the test rules, thus completing the durability test.

[0055] Example 2

[0056] This embodiment has a basically the same structure as Embodiment 1.

[0057] The difference is that,

[0058] like Figure 3 As shown,

[0059] A reinforcing rod 55 is provided between the front swing arm 52 and the rear swing arm 51, and the two ends of the reinforcing rod 55 are rotatably connected to the front swing arm 52 and the rear swing arm 51 respectively.

[0060] By setting the reinforcing rod 55, the swing arms can be made more stable, so that the tray 3 will not wobble.

[0061] Example 3

[0062] This embodiment has a basically the same structure as Embodiment 1.

[0063] The difference is that,

[0064] The device consists of five parts: a precision constant temperature bath (Figures 2 and 7), a temperature field switching mechanism, a temperature traceability instrument, a dynamic performance analysis module for the measured temperature sensor, and a control and data processing system.

[0065] Precision thermostatic baths are used to provide a high-precision temperature field. The commonly used liquid in the bath is pure water, but alcohol, silicone oil, coolant, etc., can also be used as needed. The temperature fluctuation of the thermostatic bath is 0.01℃ / 10min, and the temperature field uniformity is 0.01℃. It can provide a temperature field within a range of (4~95)℃, ensuring the temperature accuracy of the device.

[0066] The temperature field switching mechanism consists of a motor and a swing arm mechanism, which can realize the switching of the measured temperature sensor in different temperature fields, thereby completing the temperature shock test of the sensor to achieve the durability test of the temperature sensor.

[0067] Temperature traceability instruments typically employ high-precision platinum resistance temperature measurement instruments, ensuring good traceability of the temperature field in the constant temperature bath used, facilitating the acceptance of temperature accuracy by both the testing party and the tested party.

[0068] The dynamic analysis module of the sensor under test mainly consists of a resistance value measuring instrument with rapid sampling, which can quickly record the resistance value change curve of the temperature sensor under test under different temperature fields and analyze its performance and stability.

[0069] The control and data processing system mainly consists of host computer (controller) programs or client software, which can set the temperature of the constant temperature bath, the switching time of the switching mechanism, the immersion time of the sensor, the recording of measurement data and the automatic generation of raw records, and functions such as fault indication and alarm lights.

[0070] With the swing arm vertically positioned in the middle of the device as the starting point, the temperature sensor to be measured is fixed in tray 3 of the switching mechanism. After starting, tray 3 with the temperature sensor to be measured is immersed in the left (or right) constant temperature bath for 30 seconds. Then, the swing arm of the switching mechanism swings to the right (or left) constant temperature bath for 30 seconds, and then swings back to the left constant temperature bath, thus completing a full high and low temperature shock test cycle. This process is repeated until the set number of cycles is completed.

[0071] Once tray 3 is placed in the constant temperature bath, the dynamic analysis module of the tested sensor records the resistance value change curve of the tested temperature sensor. Because the constant temperature bath contains a traceable high-precision platinum resistance sensor, it is possible to accurately compare the dynamic response of the tested temperature sensor with that of the high-precision platinum resistance sensor. Through analysis of a large amount of data, the dynamic response trend of the tested temperature sensor can be determined, thereby analyzing the lifespan test trend of the stable sensor. After the test is completed, a raw record with the specified format is automatically generated.

[0072] The above description is merely a preferred embodiment of this application; however, the scope of protection of this application is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A durability testing device for temperature sensors in high and low temperature baths, characterized in that, The device includes a housing (1) with a workbench (11), a first thermostatic bath (2) and a second thermostatic bath (7) installed in the housing (1), a swing arm assembly (4) installed on the workbench (11), a tray (3) installed on the swing arm assembly (4), a power device (5) for driving the swing arm assembly (4) to swing, a detection device for detecting the position of the swing arm assembly (4), and a controller; a temperature sensor is fixed in the tray (3), and the first thermostatic bath (2) and the second thermostatic bath (7) are each provided with a slot (6) adapted to the tray (3), and the controller is connected to the first thermostatic bath (2), the second thermostatic bath (7), the power device, and the detection device respectively.

2. The durability testing device for temperature sensors in high and low temperature baths according to claim 1, characterized in that: The first constant temperature bath (2) and the second constant temperature bath (7) both contain liquids at constant temperature. The bottom surface of the tray (3) is provided with a liquid passage hole (31), and the temperature sensor is immersed in the liquid.

3. The durability testing device for temperature sensors in high and low temperature baths according to claim 1, characterized in that: The workbench (11) is provided with a support plate (56), and the detection device includes a first proximity switch (57) and a second proximity switch (58) installed on the support plate (56); the first proximity switch (57) and the second proximity switch (58) are respectively connected to the controller signal; The first proximity switch (57) is used to detect whether the tray (3) on the swing arm assembly (4) is in contact with the slot (6) on the second constant temperature bath (7); The second proximity switch (58) is used to detect whether the tray (3) on the swing arm assembly (4) is in contact with the slot (6) on the first thermostatic bath (2).

4. The durability testing device for temperature sensors in high and low temperature baths according to claim 3, characterized in that: The swing arm assembly (4) includes a front swing arm (52) and a rear swing arm (51) that are rotatably connected at one end to the worktable (11); the two sides of the tray (3) are rotatably connected to the other ends of the front swing arm (52) and the rear swing arm (51), respectively.

5. The durability testing device for temperature sensors in high and low temperature baths according to claim 4, characterized in that: The workbench (11) is provided with a front support (54) and a rear support (53); the front swing arm (52) is rotatably connected to the front support (54) through a rotating shaft; the rear swing arm (51) is rotatably connected to the rear support (53) through a transmission shaft (64); the transmission shaft (64) is connected to the power device (5); the axis of the transmission shaft (64) is parallel to and offset from the axis of the rotating shaft.

6. The durability testing device for temperature sensors in high and low temperature baths according to claim 5, characterized in that: A reinforcing rod (55) is provided between the front swing arm (52) and the rear swing arm (51), and the two ends of the reinforcing rod (55) are rotatably connected to the front swing arm (52) and the rear swing arm (51) respectively.

7. The durability testing device for temperature sensors in high and low temperature baths according to claim 5, characterized in that: The power unit (5) includes a base (63) fixedly connected to the worktable (11), a geared motor (62) fixedly connected to the base (63), and a coupling (61) disposed between the geared motor (62) and the transmission shaft (64); The geared motor (62) is connected to the controller signal.

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