Temperature sensor precision test tool

Abstract

The utility model embodiment provides a kind of temperature sensor precision test tool, comprising: tool shell, circuit board, standard temperature digital table and multiple test display components;Tool shell is sequentially provided with accommodating cavity and sensor mounting area along first direction, and sensor mounting area is arranged with multiple sensor mounting holes, one sensor mounting hole is fixedly provided with one temperature sensor to be measured, and accommodating cavity is provided with digital table mounting interface that is connected inside and outside accommodating cavity;Circuit board is set in accommodating cavity, and each pin of each temperature sensor to be measured is respectively electrically connected with circuit board;Standard temperature digital table is set in digital table mounting interface, and standard temperature digital table is electrically connected with circuit board;Multiple test display components are respectively and one-to-one corresponding with the temperature sensor to be measured in multiple sensor mounting holes, and each test display component is respectively electrically connected with circuit board, for showing the test result of the temperature sensor to be measured corresponding therewith.

Description

Technical Field

[0001] This utility model relates to the field of precision testing equipment technology, and more specifically, to a temperature sensor precision testing fixture. Background Technology

[0002] When managing weapon systems, the temperature environment in which they operate is particularly important. Temperature monitoring is achieved through temperature sensors, which require high accuracy in temperature acquisition. Therefore, it is necessary to conduct accuracy tests on the temperature sensors. The temperature sensors should generally have an accuracy of no more than ±0.5℃ and be able to make reasonable judgments to confirm whether the temperature sensors are qualified.

[0003] Current temperature sensor accuracy testing primarily relies on the product carrier for accuracy measurement. The temperature sensor is connected to the carrier device via a cable, and temperature data is read using host computer software (wireless handheld device). The data is then compared with a standard thermometer to calculate the error accuracy. A human observer then judges whether the error exceeds ±0.5℃ to determine if the temperature sensor's accuracy is acceptable. However, current temperature sensor accuracy testing environments are harsh, only one sensor is tested at a time, preventing batch testing. Furthermore, the sensor installation interface is limited, and real-time human monitoring and judgment result in high error rates and long testing times, leading to low work efficiency. Utility Model Content

[0004] This application provides a temperature sensor accuracy testing fixture to solve at least one of the problems in the prior art.

[0005] According to an embodiment of this application, a temperature sensor accuracy testing fixture is provided, comprising:

[0006] The tooling housing has a receiving cavity and a sensor mounting area arranged sequentially along a first direction. The sensor mounting area has a plurality of sensor mounting holes arranged in a row. A temperature sensor to be measured is fixedly installed in one of the sensor mounting holes. A digital meter mounting interface is provided in the receiving cavity, and the digital meter mounting interface connects the inside and outside of the receiving cavity.

[0007] A circuit board is disposed within the accommodating cavity, and each pin of each of the temperature sensors to be measured is electrically connected to the circuit board.

[0008] A standard temperature digital meter is provided, wherein the standard temperature digital meter is disposed within the digital meter mounting interface and the display screen of the standard temperature digital meter is disposed outside the accommodating cavity, and the standard temperature digital meter is electrically connected to the circuit board.

[0009] Multiple test display components are arranged on the tooling housing, and the projections of the multiple test display components in the second direction are all located in the accommodating cavity. The multiple test display components are respectively arranged one-to-one with the temperature sensors under test in the multiple sensor mounting holes. Each test display component is electrically connected to the circuit board and is used to display the test results of the corresponding temperature sensor under test.

[0010] Wherein, the first direction and the second direction are perpendicular to each other.

[0011] In some embodiments of this application, the tooling housing includes an upper tooling housing, a lower tooling housing, and a tooling cover plate;

[0012] The lower shell of the tooling is a shell structure at one end along the first direction, and the shell structure is open at one end along the second direction. The other end of the lower shell of the tooling is a plate structure, and the plate structure is integrally formed and connected to the closed end sidewall of the shell structure. The plate structure extends away from the shell structure along the first direction.

[0013] The upper and lower housings of the fixture are fixedly connected to the plate structure, forming the sensor mounting area. Multiple sensor mounting holes are arranged on the end face of the plate structure near the upper housing. The upper housing has multiple sensor fixing holes, each of which connects to the opposite end faces of the upper housing. The multiple sensor fixing holes correspond one-to-one with the multiple sensor mounting holes. The temperature sensor to be measured passes through the upper housing through the sensor fixing holes, and its pin end is fixedly installed in the sensor mounting holes.

[0014] The tooling cover plate is fixedly installed at the opening end of the housing structure of the tooling lower shell, and the accommodating cavity is formed between the tooling cover plate and the housing structure. The digital meter mounting interface is provided on one side wall of the housing structure.

[0015] In some embodiments of this application, a plurality of the test display components are arranged on the tooling cover plate.

[0016] In some embodiments of this application, a mounting post is provided at each of the four corners of the accommodating cavity, and four first fixing holes are provided on the circuit board. The four first fixing holes are respectively provided in correspondence with the four mounting posts, and the circuit board is fixed in the accommodating cavity by bolts from the four mounting posts and the four first fixing holes.

[0017] In some embodiments of this application, the upper shell of the tooling is provided with a plurality of second fixing holes at its two edges along the first direction, and each second fixing hole is connected to the opposite two end faces of the upper shell of the tooling; the plate structure is provided with a plurality of third fixing holes on its end face near the upper shell of the tooling, and the plurality of third fixing holes are respectively provided in a one-to-one correspondence with the plurality of second fixing holes; the upper shell of the tooling and the lower shell of the tooling are fixedly connected by bolts passing through the second fixing holes and the third fixing holes in sequence.

[0018] In some embodiments of this application, a plurality of sensor mounting holes are arranged in multiple rows along the first direction, and a wiring groove is provided between each pair of rows of sensor mounting holes. Each wiring groove extends along the first direction and passes through the housing structure to communicate with the receiving cavity. Each sensor mounting hole is connected to one of its adjacent wiring grooves, so that each pin of the temperature sensor to be measured is electrically connected to the circuit board through a cable.

[0019] In some embodiments of this application, a sensor adapter board is further included, wherein a sensor adapter board is fixedly disposed in each of the sensor mounting holes, and each of the sensor adapter boards is provided with a plurality of sockets, the number of sockets being the same as the number of pins of the temperature sensor to be measured, and the temperature sensor to be measured is fixedly connected to the sensor adapter board by inserting the plurality of pins of the temperature sensor to be measured into the plurality of sockets respectively.

[0020] In some embodiments of this application, the shell structure is a rectangular shell, and both the tooling upper shell and the plate structure are rectangular plates.

[0021] In some embodiments of this application, each of the test display components includes an indicator light and a digital display. Each indicator light and each digital display are electrically connected to the circuit board. Multiple digital displays are arranged in two rows along a third direction, and multiple indicator lights are arranged in two rows along the third direction. The two rows of digital displays are located between the two rows of indicator lights, and the multiple indicator lights are respectively configured to correspond one-to-one with the multiple digital displays.

[0022] Wherein, the third direction, the second direction, and the first direction are all perpendicular to each other.

[0023] In some embodiments of this application, the circuit board is provided with a standard temperature input interface, a test display output interface, a sensor acquisition input interface, and a power input interface. The tooling housing is provided with a power connection port. The power input interface is connected to a power source through the power connection port. The standard temperature input interface is connected to the standard temperature digital meter. The test display output interface is connected to each test display component. The sensor acquisition input interface is electrically connected to each temperature sensor under test.

[0024] The beneficial effects of this application's embodiments are as follows: The temperature sensor accuracy testing fixture has reserved interfaces for various types of three-pin temperature sensors available on the market, enabling universality and more convenient testing. It can simultaneously perform accuracy tests on multiple temperature sensors, solving the problems of harsh testing environments and the inability to test only one sensor at a time in existing technologies. This facilitates the mass production of supporting products and simplifies operation. Furthermore, the temperature sensor accuracy testing fixture can automatically determine pass / fail status and issue alarms, avoiding human error and achieving partial automation, significantly shortening the product testing cycle. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a temperature sensor accuracy testing fixture provided in an embodiment of this application;

[0027] Figure 2 An exploded view of a temperature sensor accuracy testing fixture provided in an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the upper shell of a temperature sensor accuracy testing fixture provided in an embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the structure of the lower shell of a temperature sensor accuracy testing fixture provided in an embodiment of this application.

[0030] Figure 5 This application provides a schematic diagram of the structure of a tooling cover plate in a temperature sensor accuracy testing fixture.

[0031] Figure 6 This is a schematic diagram of the circuit board structure in a temperature sensor accuracy testing fixture provided in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the structure of the temperature sensor under test in a temperature sensor accuracy testing fixture provided in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the assembly of a sensor adapter board and a temperature sensor under test in a temperature sensor accuracy testing fixture provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 1 is the fixture housing; 11 is the upper fixture housing; 111 is the sensor mounting hole; 112 is the second mounting hole; 12 is the fixture cover plate; 121 is the display slot; 122 is the indicator light slot; 13 is the lower fixture housing; 131 is the housing structure; 1311 is the accommodating cavity; 1312 is the digital meter mounting interface; 1313 is the power connection port; 132 is the board structure; 1321 is the sensor mounting hole; 1322 is the third mounting hole; 1323 is the wiring channel; 14 is the mounting post; 2 is the circuit board; 21 is the first mounting hole; 22 is the standard temperature input interface; 23 is the test display output interface; 24 is the sensor acquisition input interface; 25 is the power input interface; 3 is the standard temperature digital meter; 4 is the test display component; 41 is the indicator light; 42 is the digital display; 5 is the temperature sensor under test; 51 is the pin; 6 is the sensor adapter board. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0036] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, it may include a series of structures, without being limited to the structures listed, but may optionally include structures not listed, or may optionally include other components inherent to these structures.

[0037] This application discloses a temperature sensor accuracy testing fixture, which enables mass production of supporting products, standardizes interface connections, and automatically performs pass / fail judgment. It solves the problem of human misreading in prior art and simplifies the sensor accuracy testing environment. Detailed descriptions follow.

[0038] Figure 1 – Figure 8 A temperature sensor accuracy testing fixture according to an embodiment of this application is shown. Figure 1 – Figure 8 As shown, the temperature sensor accuracy testing fixture mainly includes: fixture housing 1, circuit board 2, standard temperature digital meter 3, and multiple test display components 4. The fixture housing 1 is used to provide a fixed position for the circuit board 2, standard temperature digital meter 3, multiple temperature sensors 5 under test, and multiple test display components 4. The standard temperature digital meter 3 is used to obtain the current standard temperature. The circuit board 2 compares the current standard temperature obtained by the standard temperature digital meter 3 with the temperature obtained by the temperature sensor 5 under test to determine whether the temperature sensor 5 under test is qualified, and displays the accuracy test result of the temperature sensor 5 under test through the test display components 4. Specifically, the fixture housing 1 is provided with a receiving cavity 1311 and a sensor mounting area in sequence along the first direction. The receiving cavity 1311 is used to place the circuit board 2, the standard temperature digital meter 3, and the test display component 4. The sensor mounting area is provided with a plurality of sensor mounting holes 1321 to provide a fixed position for the temperature sensor 5 to be measured. One temperature sensor 5 to be measured is fixedly installed in one sensor mounting hole 1321, and each pin 51 of each temperature sensor 5 to be measured is electrically connected to the circuit board 2 provided in the receiving cavity 1311 to realize signal acquisition. A digital meter mounting interface 1312 is provided inside the accommodating cavity 1311, which connects the inside and outside of the accommodating cavity 1311. A standard temperature digital meter 3 is set inside the digital meter mounting interface 1312, and the display screen of the standard temperature digital meter 3 is set outside the accommodating cavity 1311. The standard temperature digital meter 3 has a built-in temperature sensor, so the current standard temperature can be read directly through the standard temperature digital meter 3. The standard temperature digital meter 3 is electrically connected to the circuit board 2 and can output digital signals to the MCU chip of the circuit board 2 for acquisition, so as to transmit the current standard temperature information to the MCU chip. It is powered by 3.3V and displays the current standard temperature in real time. In addition, multiple test display components 4 are arranged on the tooling housing 1, and the projections of the multiple test display components 4 in the second direction are all located in the accommodating cavity 1311. That is, the multiple test display components 4 are arranged on one side of the accommodating cavity 1311. The multiple test display components 4 are respectively arranged in correspondence with the multiple temperature sensors 5 under test in the multiple sensor mounting holes 1321. Each test display component 4 is electrically connected to the circuit board 2 to display the test results of the corresponding temperature sensor 5 under test, thereby intuitively obtaining the test results of each temperature sensor 5 under test.

[0039] In this embodiment, the first direction is the length direction of the temperature sensor accuracy testing fixture, the second direction is the height direction of the temperature sensor accuracy testing fixture, and the third direction is the width direction of the temperature sensor accuracy testing fixture. When the temperature sensor accuracy testing fixture is in operation, it is normally placed in the designated position, and the second direction is perpendicular to the ground. However, it should be noted that the perpendicularity in this application is not absolute, and can be 90°±10°.

[0040] In some embodiments, such as Figure 1 – Figure 5As shown, the tooling housing 1 includes an upper tooling housing 11, a lower tooling housing 13, and a tooling cover plate 12. The lower tooling housing 13 is divided into two ends along a first direction, one end being a housing structure 131 and the other end being a plate structure 132. Specifically, the housing structure 131 has an opening at one end along a second direction. The tooling cover plate 12 is fixedly disposed at the opening end of the housing structure 131 of the lower tooling housing 13, thus forming a receiving cavity 1311 between the tooling cover plate 12 and the housing structure 131. The circuit board 2 is fixedly installed within the receiving cavity 1311. A digital meter mounting interface 1312 is provided on one side wall of the housing structure 131 to provide a fixed mounting position for a standard temperature digital meter 3, facilitating electrical connection between the standard temperature digital meter 3 and the circuit board 2 within the receiving cavity 1311. Furthermore, a power connection port 1313 is provided on the other side wall of the housing structure 131 to connect the circuit board 2 to a power source. Furthermore, the plate structure 132 is integrally formed and connected to the sidewall of the housing structure 131, and extends away from the housing structure 131 along the first direction. Simultaneously, the plate structure 132 is located on one side of the closed end of the housing structure 131, meaning that one end face of the plate structure 132 is on the same horizontal plane as the closed end face of the housing structure 131. The upper tooling shell 11 is fixedly connected to the plate structure 132, together forming the sensor mounting area. The end face of the plate structure 132 connected to the upper tooling shell 11 is the end face that is not on the same horizontal plane as the closed end face of the housing structure 131. Multiple sensor mounting holes 1321 are arranged on the end face of the plate structure 132 near the upper housing 11 of the fixture. The upper housing 11 of the fixture is provided with multiple sensor fixing holes 111. Each sensor fixing hole 111 is connected to the opposite end faces of the upper housing 11 of the fixture, and the multiple sensor fixing holes 111 are respectively set one-to-one with the multiple sensor mounting holes 1321. The temperature sensor 5 to be measured passes through the upper housing 11 of the fixture through the sensor fixing hole 111, and its pin 51 is fixedly installed in the sensor mounting hole 1321. Thus, the temperature sensor 5 to be measured is fixedly set through the sensor fixing hole 111 and the sensor mounting hole 1321. The upper housing 11 of the fixture supports the height of the temperature sensor 5 to facilitate the installation of the temperature sensor 5 to be measured, and at the same time, it plays a protective role for it. Furthermore, this temperature sensor accuracy testing fixture is equipped with multiple sensor mounting holes 1321 and multiple sensor fixing holes 111, enabling simultaneous testing of the accuracy of multiple temperature sensors. This solves the problem of harsh testing environments and the limitation of testing only one sensor at a time in existing technologies, achieving batch testing and simplifying the temperature sensor accuracy testing environment. In specific implementation, the digital meter mounting interface 1312 and the power connection port 1313 are respectively located on the adjacent side walls of the connecting sidewalls of the housing structure 131 and the plate structure 132, resulting in a more rational overall layout design.

[0041] In a specific embodiment, such as Figure 2 and Figure 4 As shown, multiple sensor mounting holes 1321 are arranged in multiple rows along the first direction, and a wiring groove 1323 is provided between every two rows of sensor mounting holes 1321. Each wiring groove 1323 extends along the first direction and passes through the housing structure 131 to connect to the receiving cavity 1311. Each sensor mounting hole 1321 is connected to one of its adjacent wiring grooves 1323, so that the temperature sensor 5 to be measured in the sensor mounting hole 1321 can be connected to the circuit board 2 via cables. In a specific implementation, the number of sensor mounting holes 1321 can be designed to be 20, arranged in five rows and four columns along the first direction. Correspondingly, there are four wiring grooves 1323, and the 20 sensor mounting holes 1321 are connected to the four wiring grooves 1323 respectively.

[0042] In addition, such as Figure 2 – Figure 4 as well as Figure 7 , Figure 8 As shown, the temperature sensor accuracy testing fixture in this embodiment further includes a sensor adapter board 6. Each sensor mounting hole 1321 has a fixedly installed sensor adapter board 6. Each sensor adapter board 6 has multiple sockets (not shown in the figure), and the number of sockets is the same as the number of pins 51 of the temperature sensor 5 under test, to facilitate insertion of the temperature sensor 5. By inserting the multiple pins 51 of the temperature sensor 5 under test into the multiple sockets, the temperature sensor 5 under test and the sensor adapter board 6 are fixedly connected. Multiple pins 51 of the temperature sensor 5 under test are led out from the bottom of the sensor adapter board 6 and introduced to the interface of the circuit board 2 via cables to achieve signal transmission. In specific implementation, the temperature sensor 5 under test has three pins 51 (signal output pin, 3.3V power input pin, and GND ground pin), such as the 18B20 model temperature sensor. Correspondingly, the sensor adapter board 6 also has three sockets. Through the design of the sensor adapter board 6, interfaces for various types of three-pin temperature sensors on the market are reserved, thereby achieving universality and making testing more convenient. Furthermore, the sensor mounting hole 111 can be designed as a convex shape, with its large-diameter end close to the sensor mounting hole 1321, and the diameter of its large-diameter end being the same as the diameter of the sensor adapter plate 6. Thus, when the upper housing 11 of the fixture is fixedly connected to the lower housing 13 of the fixture, the sensor adapter plate 6 is fixedly clipped into the large-diameter end of the sensor mounting hole 111. Of course, the sensor adapter plate 6 can also be directly fixed in the sensor mounting hole 1321 or the sensor mounting hole 111. This application does not limit this.

[0043] In the embodiments of this application, such as Figure 1 , Figure 3 and Figure 4As shown, the upper casing 11 of the tooling is provided with multiple second fixing holes 112 at its two edges along the first direction. Each second fixing hole 112 connects to the opposite two end faces of the upper casing 11. Correspondingly, the end face of the plate structure 132 near the upper casing 11 of the tooling is provided with multiple third fixing holes 1322, and the multiple third fixing holes 1322 are respectively provided in a one-to-one correspondence with the multiple second fixing holes 112. Thus, bolts are sequentially inserted through the second fixing holes 112 and the third fixing holes 1322 and fixed, thereby fixing the upper casing 11 of the tooling and the lower casing 13 of the tooling. In the specific implementation process, the upper casing 11 of the tooling is provided with three second fixing holes 112 at each of its two edges along the first direction, that is, one second fixing hole 112 is provided at each end of the two edges and one second fixing hole 112 is provided in the middle, for a total of six second fixing holes 112, to ensure the stability of the connection between the upper casing 11 of the tooling and the lower casing 13 of the tooling.

[0044] In other embodiments, such as Figure 4 and Figure 6 As shown, a mounting post 14 is provided at each of the four corners of the accommodating cavity 1311. Correspondingly, four first fixing holes 21 are provided on the circuit board 2. The four first fixing holes 21 are respectively provided with the four mounting posts 14, so that the circuit board 2 is fixed in the accommodating cavity 1311 by bolts through the four mounting posts 14 and the four first fixing holes 21.

[0045] In the embodiments of this application, such as Figure 6 As shown, circuit board 2 is equipped with a standard temperature input interface 22, a test display output interface 23, a sensor acquisition input interface 24, and a power input interface 25. The power input interface 25 is connected to a power supply to power circuit board 2. The standard temperature input interface 22 is connected to a standard temperature digital meter 3 to transmit the current standard temperature information obtained by the standard temperature digital meter 3 to circuit board 2. The test display output interface 23 is connected to each test display component 4 to send the test results to each test display component 4 for display. The sensor acquisition input interface 24 is electrically connected to each temperature sensor 5 under test to obtain the temperature value measured by each temperature sensor 5.

[0046] In some specific embodiments, such as Figure 1 , Figure 2 and Figure 5As shown, multiple test display components 4 are arranged on the fixture cover plate 12. Furthermore, each test display component 4 includes an indicator light 41 and a digital display 42. Each indicator light 41 and each digital display 42 are electrically connected to the circuit board 2. The multiple digital displays 42 are arranged in two rows along a third direction, and the multiple indicator lights 41 are arranged in two rows along a third direction. The two rows of digital displays 42 are located between the two rows of indicator lights 41, and each indicator light 41 corresponds one-to-one with each of the multiple digital displays 42. That is, the fixture cover plate 12 has two rows of display slots 121 and two rows of indicator light slots 122 along a third direction, with the two rows of display slots 121 located within the two rows of indicator light slots 122. Each display slot 121 contains a digital display 42 to display the temperature acquisition value of the corresponding temperature sensor 5 under test. Each indicator light slot 122 contains an indicator light 41, such as a red indicator light. When the corresponding temperature sensor 5 under test fails, the red light illuminates.

[0047] In the specific implementation process, such as Figure 2 As shown, the shell structure 131 is a rectangular shell, and the upper shell 11 of the tooling and the plate structure 132 are both rectangular plates.

[0048] The above describes the various components of the temperature sensor accuracy testing fixture provided in this embodiment and their connection relationships. The following section will discuss further details. Figure 1 – Figure 8 The working principle of the temperature sensor accuracy testing fixture is described in detail.

[0049] In an embodiment of the present application, a power chip, an MCU chip, a standard temperature input interface 22, two test display output interfaces 23, two sensor acquisition input interfaces 24, and a power input interface 25 are provided on the circuit board 2. The power chip is connected to a power source through the power input interface 25 and is used to supply power to the MCU chip. The MCU chip is respectively connected to the standard temperature input interface 22, the test display output interface 23, and the sensor acquisition input interface 24 to implement digital quantity acquisition of the temperature sensor to be measured, digital quantity display of the temperature sensor, logic determination to light up the indicator light, and acquisition of the standard temperature digital meter. The MCU chip provides digital signal acquisition and screen display, and at the same time participates in logical operations, obtains the current standard temperature information of the standard temperature digital meter 3 through the standard temperature input interface 22, obtains the temperature acquisition value of each temperature sensor 5 to be measured through the sensor acquisition input interface 24, and compares the temperature acquisition value of each temperature sensor 5 to be measured with the current standard temperature information for numerical magnitude comparison. If the difference between the two exceeds a preset threshold (for example, 1.5 °C), it is determined that the temperature sensor 5 to be measured is unqualified, otherwise it is determined that the temperature sensor 5 to be measured is unqualified, and the test result is sent to the indicator light 41 and the digital display 42 through the test display output interface 23, so as to display the temperature acquisition value of each temperature sensor 5 to be measured by using the digital display 42, and display whether each temperature sensor 5 to be measured is qualified by using the indicator light 41. When unqualified, the MCU chip outputs a high level to light up its corresponding indicator light 41.

[0050] Further specifically, the temperature sensor precision test tooling can simultaneously test 20 temperature sensors 5 to be measured. The two sensor acquisition input interfaces 24 respectively correspond to the three-pin interfaces of 10 temperature sensors 5 to be measured, and the two test display output interfaces 23 also respectively correspond to the test results of 10 temperature sensors 5 to be measured, that is, they respectively correspond to the single interfaces of 10 indicator lights 41 and the dual interfaces of 10 digital displays 42. The indicator light 41 is a red indicator light. If the precision of the corresponding temperature sensor 5 to be measured is greater than the preset threshold, the red light is on, indicating unqualified, otherwise it is qualified. The digital display 42 is composed of three groups of digital display tubes to implement digital display of the temperature acquisition value of the corresponding temperature sensor 5 to be measured.

[0051] When performing accuracy testing on this temperature sensor accuracy testing fixture, 20 temperature sensors 5 to be tested are inserted into the upper shell 11 of the fixture and fixed in the sensor mounting holes 1321 of the lower shell 13 of the fixture. They are then fixed through the insertion holes of the sensor adapter board 6. Then, 3.3V DC power is supplied through the direct-plug power supply. At this time, the circuit board 2 is working. After reaching a stable environment under normal temperature and pressure, the 20 digital displays 42 display the temperature acquisition values ​​of the 20 temperature sensors 5 to be tested in real time. The temperature acquisition values ​​of the temperature sensors 5 to be tested are logically calculated by the MCU chip of the circuit board 2 and compared with the current standard temperature of the standard temperature digital table 3. If the difference between the two is greater than the preset threshold, a high level is output and the corresponding indicator light 41 is lit. The set of temperature sensors 5 to be tested is unqualified; otherwise, it is qualified and the result is recorded.

[0052] However, it should be noted that any MCU chip on the market that can perform numerical comparison and judgment logic operations can be used, as long as it can perform the judgment. This application does not impose any restrictions on this.

[0053] In summary, this application discloses a temperature sensor accuracy testing fixture, which provides interfaces for various types of three-pin temperature sensors available on the market, enabling universality and more convenient testing. It can simultaneously test the accuracy of multiple temperature sensors, solving the problems of harsh testing environments and the inability to test only one sensor at a time in existing technologies. This facilitates the mass production of related products and simplifies operation. Furthermore, this temperature sensor accuracy testing fixture can automatically determine pass / fail status and issue alarms, avoiding human error and achieving partial automation, significantly shortening the product testing cycle.

[0054] It will be understood by those skilled in the art that the accompanying drawings are merely schematic diagrams of one embodiment, and the components shown in the drawings are not necessarily essential for implementing this invention. It should also be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope described in the claims.

Claims

1. A fixture for testing the accuracy of a temperature sensor, characterized in that, include: The tooling housing has a receiving cavity and a sensor mounting area arranged sequentially along a first direction. The sensor mounting area has a plurality of sensor mounting holes arranged in a row. A temperature sensor to be measured is fixedly installed in one of the sensor mounting holes. A digital meter mounting interface is provided in the receiving cavity, and the digital meter mounting interface connects the inside and outside of the receiving cavity. A circuit board is disposed within the accommodating cavity, and each pin of each of the temperature sensors to be measured is electrically connected to the circuit board. A standard temperature digital meter is provided, wherein the standard temperature digital meter is disposed within the digital meter mounting interface and the display screen of the standard temperature digital meter is disposed outside the accommodating cavity, and the standard temperature digital meter is electrically connected to the circuit board. Multiple test display components are arranged on the tooling housing, and the projections of the multiple test display components in the second direction are all located in the accommodating cavity. The multiple test display components are respectively arranged one-to-one with the temperature sensors under test in the multiple sensor mounting holes. Each test display component is electrically connected to the circuit board and is used to display the test results of the corresponding temperature sensor under test. Wherein, the first direction and the second direction are perpendicular to each other.

2. The temperature sensor accuracy testing fixture according to claim 1, characterized in that, The tooling housing includes an upper tooling housing, a lower tooling housing, and a tooling cover plate; The lower shell of the tooling is a shell structure at one end along the first direction, and the shell structure is open at one end along the second direction. The other end of the lower shell of the tooling is a plate structure, and the plate structure is integrally formed and connected to the closed end sidewall of the shell structure. The plate structure extends away from the shell structure along the first direction. The upper and lower housings of the fixture are fixedly connected to the plate structure, forming the sensor mounting area. Multiple sensor mounting holes are arranged on the end face of the plate structure near the upper housing. The upper housing has multiple sensor fixing holes, each of which connects to the opposite end faces of the upper housing. The multiple sensor fixing holes correspond one-to-one with the multiple sensor mounting holes. The temperature sensor to be measured passes through the upper housing through the sensor fixing holes, and its pin end is fixedly installed in the sensor mounting holes. The tooling cover plate is fixedly installed at the opening end of the housing structure of the tooling lower shell, and the accommodating cavity is formed between the tooling cover plate and the housing structure. The digital meter mounting interface is provided on one side wall of the housing structure.

3. The temperature sensor accuracy testing fixture according to claim 2, characterized in that, Multiple test display components are arranged on the tooling cover plate.

4. The temperature sensor accuracy testing fixture according to claim 2, characterized in that, At each of the four corners of the accommodating cavity, there is a mounting post. The circuit board has four first fixing holes, which correspond one-to-one with the four mounting posts. The circuit board is fixed to the accommodating cavity by bolts from the four mounting posts and the four first fixing holes.

5. The temperature sensor accuracy testing fixture according to claim 2, characterized in that, The upper shell of the tooling is provided with a plurality of second fixing holes at its two edges along the first direction, and each second fixing hole is connected to the opposite two end faces of the upper shell of the tooling; the plate structure is provided with a plurality of third fixing holes on its end face near the upper shell of the tooling, and the plurality of third fixing holes are respectively provided in a one-to-one correspondence with the plurality of second fixing holes; the upper shell of the tooling and the lower shell of the tooling are fixedly connected by bolts passing through the second fixing holes and the third fixing holes in sequence.

6. The temperature sensor accuracy testing fixture according to claim 2, characterized in that, The plurality of sensor mounting holes are arranged in multiple rows along the first direction, and a wiring groove is provided between each pair of rows of sensor mounting holes. Each wiring groove extends along the first direction and passes through the housing structure to connect to the receiving cavity. Each sensor mounting hole is connected to one of its adjacent wiring grooves, so that each pin of the temperature sensor to be measured is electrically connected to the circuit board through a cable.

7. The temperature sensor accuracy testing fixture according to claim 6, characterized in that, Also includes: A sensor adapter board is fixedly installed in each of the sensor mounting holes. Each sensor adapter board is provided with multiple sockets, and the number of sockets is the same as the number of pins of the temperature sensor to be measured. The temperature sensor to be measured is fixedly connected to the sensor adapter board by inserting the multiple pins of the temperature sensor to be measured into the multiple sockets respectively.

8. The temperature sensor accuracy testing fixture according to claim 2, characterized in that, The shell structure is a rectangular shell, and both the upper shell of the tooling and the plate structure are rectangular plates.

9. The temperature sensor accuracy testing fixture according to claim 1, characterized in that, Each of the test display components includes an indicator light and a digital display. Each indicator light and each digital display are electrically connected to the circuit board. Multiple digital displays are arranged in two rows along a third direction, and multiple indicator lights are arranged in two rows along the third direction. The two rows of digital displays are located between the two rows of indicator lights, and each of the multiple indicator lights corresponds to one of the multiple digital displays. Wherein, the third direction, the second direction, and the first direction are all perpendicular to each other.

10. The temperature sensor accuracy testing fixture according to claim 1, characterized in that, The circuit board is equipped with a standard temperature input interface, a test display output interface, a sensor acquisition input interface, and a power input interface. The fixture housing is equipped with a power connection port. The power input interface is connected to a power source through the power connection port. The standard temperature input interface is connected to the standard temperature digital meter. The test display output interface is connected to each test display component. The sensor acquisition input interface is electrically connected to each temperature sensor under test.

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