Calibration test fixture for control panel of water level sensor

Abstract

The utility model discloses a water level sensor control calibration test fixture, which comprises a machine body, a microprocessor, a push-pull piece, an ejector pin plate, a plurality of ejector pins and a fixing plate, the microprocessor is arranged in the machine body, the push-pull piece is arranged at the top of the machine body, the ejector pin plate is connected to the bottom of the push-pull piece, the plurality of ejector pins are arranged at the bottom of the ejector pin plate, and the fixing plate is arranged on the machine body. The fixed plate can be installed on the machine body in an up-and-down moving mode, the fixed plate is located at the bottoms of the ejector pins, an up-and-down through hole is formed in the center of the fixed plate, and a water tank is arranged in the machine body and located under the through hole; the ejector pins can abut against the top of the water level sensor control panel when the water level sensor control panel is calibrated, the ejector pins and the water level sensor control panel are powered on, and the microprocessor is in control connection with the push-pull piece. According to the utility model, not only can the sensor control panel be calibrated, but also the product shell can be tested, the use is very convenient, and the production efficiency can be greatly improved.

Description

Technical Field

[0001] The utility model relates to a sensor calibration test jig, in particular to a water level sensor control panel calibration test jig. Background Art

[0002] Some traditional water level sensor control boards are designed directly to fixed parameter values through programming or hardware circuits. However, due to certain errors in the parameters of the electronic components and the product's housing, even the cumulative errors are relatively large, resulting in unstable sensitivity of the entire device. As a result, a large proportion of water level sensor circuit boards produced using this method fail to meet the requirements of the entire device, requiring secondary repair or scrapping. To ensure that the sensitivity of the water level sensor control board matches the product housing, some settings assemble the water level sensor control board and the housing before calibrating the entire device. This calibration method is slow, and products that fail calibration require complete disassembly and repair, which is inefficient. Utility Model Content

[0003] The utility model provides a water level sensor control board calibration test fixture, the main purpose of which is to solve the above-mentioned problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A water level sensor control panel calibration test fixture includes a body, a microprocessor, a push-pull member, a pin plate, multiple pins and a fixed plate, wherein the microprocessor is arranged in the body, the push-pull member is installed at the top of the body, the pin plate is connected to the bottom of the push-pull member, and the multiple pins are installed at the bottom of the pin plate. The fixed plate can be installed on the body so as to move up and down, and the fixed plate is located at the bottom of the multiple pins. A through hole is provided in the center of the fixed plate, which passes through the upper and lower parts. A water tank is provided in the body, and the water tank is located directly below the through hole. The multiple pins can press against the top of the water level sensor control board and energize the water level sensor control board when the water level sensor control board is calibrated. The multiple pins are electrically connected to the microprocessor, and the microprocessor is controlled by the push-pull member.

[0006] The upper part of the machine body is a guard plate in the shape of an inverted "U", and the top of the push-pull member is installed on the inner top of the guard plate.

[0007] The upper part of the machine body includes two left and right symmetrical guide rods, and the upper ends of the two guide rods pass through the fixing plate and the ejector plate in sequence and are connected and fixed to the guard plate.

[0008] The push-pull member is an electric push rod, the top of the electric push rod is installed on the inner top of the guard plate, and the microprocessor is electrically connected to the electric push rod.

[0009] The top of the fixing plate is provided with an accommodating groove.

[0010] The water tank is a cylindrical groove, and the groove is located directly below the through hole.

[0011] The machine body is provided with a start power switch, a calibration button and a test button, and the power switch, the calibration button and the test button are all electrically connected to the microprocessor.

[0012] From the above description of the structure of the present invention, it can be seen that compared with the prior art, the present invention has the following advantages: the present invention is cleverly designed and easy to use. The water level sensor control board and product housing to be tested are installed on the top of the fixed plate, and the sensing probe at the bottom of the water level sensor control board and the product sensing probe housing are passed through the through hole of the fixed plate. When the jig is started, the microprocessor can control the push-pull member to extend downward, while driving the ejector plate to move downward. Multiple ejectors can support the top of the sensing control board, and at the same time, the sensing control board is powered on to achieve calibration. After the calibration is passed, the push-pull member mechanically pushes the ejector plate downward, while the ejector pushes against the sensing control board and the housing to move downward. At this time, the fixed plate also moves downward. When the sensing copper needle and housing of the sensor control board are inserted into the water tank, the housing sensitivity test can be performed. After the test is passed, the product can be assembled. This fixture can not only calibrate the sensor control board, but also perform product shell testing. It is extremely convenient to use. At the same time, the product shell can be assembled only after passing the test. This can avoid wasting time due to disassembly, replacement of the shell and reassembly due to failure of the test after assembly, which can greatly improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the calibration of the water level sensor control panel of the utility model.

[0014] Figure 2 This is a schematic diagram of the shell test of the product of this utility model.

[0015] Figure 3 This is an exploded schematic diagram of the fixing plate, water level sensor control board and product housing of the utility model.

[0016] Figure 4 This is the circuit principle diagram of the MCU chip of this utility model. DETAILED DESCRIPTION

[0017] Reference Figures 1 to 4. A water level sensor control panel calibration test fixture, including a body 1, a microprocessor, a push-pull member 2, a pin plate 3, a plurality of pins 4 and a fixing plate 5. The body 1 has an installation and support function. The microprocessor adopts an MCU chip, which has a control and processing function. It can control the push-pull member 2 and output feedback signals through input quantities. The push-pull member 2 can be pushed downward or pulled back upward under the control of the microprocessor, and at the same time drive the pin plate 3 to move up and down. The pin plate 3 has the function of carrying and installing the pins 4, and the pins 4 have the function of supporting and conductive connection.

[0018] Reference Figures 1 to 3 . The microprocessor is arranged in the body 1, the push-pull member 2 is installed at the top of the body 1, the ejector plate 3 is connected to the bottom of the push-pull member 2, and the multiple ejectors 4 are installed at the bottom of the ejector plate 3. The fixed plate 5 can be installed on the body 1 so as to move up and down, and the fixed plate 5 is located at the bottom of the multiple ejectors 4. The top of the fixed plate 5 is provided with a receiving groove 9. The center of the fixed plate 5 is provided with a through hole 10 that passes through the upper and lower parts. A water tank 6 is provided in the body 1, and the water tank 6 is a cylindrical groove. The water tank 6 is located directly below the through hole 10. The multiple ejectors 4 can press against the top of the water level sensor control board 7 when the water level sensor control board 7 is calibrated and are energized with the water level sensor control board 7. The multiple ejectors 4 are electrically connected to the microprocessor, and the microprocessor is controlled and connected to the push-pull member 2.

[0019] Reference Figures 1 to 3 The accommodating groove 9 facilitates the installation of the water level sensor control board 7 and the product housing 18. The through hole 10 allows the sensing copper needle 8 of the water level sensor control board 7 and the product housing 18 to penetrate deep into the water tank 6, facilitating testing. The water tank 6 is a cylindrical groove. This configuration reduces the volume of the water tank 6 while fully immersing the sensing copper needle 8 and the product housing 18, ensuring normal testing.

[0020] Reference Figure 1 and Figure 2 The upper part of the body 1 is a protective plate 11 in the shape of an inverted "U", and the top of the push-pull member 2 is installed on the inner top of the protective plate 11. The upper part of the body 1 includes two left and right symmetrical guide rods, and the upper ends of the two guide rods pass through the fixed plate 5 and the ejector plate 3 in sequence and are connected and fixed to the protective plate 11. The push-pull member 2 is an electric push rod, and the top of the electric push rod is installed on the inner top of the protective plate 11. The microprocessor is electrically connected to the electric push rod.

[0021] Reference Figure 1 and Figure 2The guard plate 11 protects the test area from external interference, protecting the test area and improving test accuracy. The guide rod 12 allows the ejector plate 3 and the fixed plate 5 to move straight up and down, ensuring smooth testing. The push-pull member 2 is an electric push rod, which not only ensures a simpler fixture, but also increases accuracy and flexibility.

[0022] Reference Figure 1 and Figure 2 The body 1 is provided with a power switch 13, a calibration button 14 and a test button 15, and the power switch 13, the calibration button 14 and the test button 15 are all electrically connected to the microprocessor. This arrangement can ensure that the user's operation is more convenient, the test is more intuitive, and the safety and efficiency of the test are improved.

[0023] Reference Figure 1 、 Figure 3 and Figure 4 . Calibration test principle: The capacitive sensing pin of the MCU chip is connected to the sensing copper needle 8, which is used to be assembled to the product housing 18 to sense the difference in AD values when there is water and when there is no water. The MCU identifies whether the product is in contact with water by judging the AD value. During calibration, the tooling short-circuits the pin header CLK pin with the ground pin. When the MCU recognizes that the CLK pin = 0V, it enters the calibration mode and completes the calibration. In the calibration mode, the MCU reads the sensing AD value of the copper needle and stores the read AD value as the benchmark value when the product is not in contact with water. When the product is in contact with water, the AD value is greater than the benchmark stored inside the chip, and it is judged that the product is in contact with water. The difference value is read and analyzed to see whether the test result is within the sensitivity range. The test is thus completed.

[0024] Reference Figures 1 to 4 Sensitivity calibration process: Place the water level sensor control board 7 into the product housing 18, then place the product housing 18 on the fixed plate 5, and activate the calibration button 14. The electric push-pull rod pushes the ejector plate 3 downward, and the ejector pins 4 press against the water level sensor control board 7, energizing the water level sensor control board 7. At the same time, two of the ejector pins 4 short-circuit the calibration signal port, triggering the water level sensor control board 7 to enter the water level sensing sensitivity calibration mode, thus completing the calibration. If the calibration is successful, the calibration indicator light 16 set on the body 1 will light up, and the next step of the sensitivity test can be carried out.

[0025] Reference Figures 1 to 4. Sensitivity test process: After the sensitivity calibration is completed, start the test button 15, the electric push-pull rod continues to push the ejector plate 3 downward, driving the fixed plate 5 to move downward together, and immerse the part of the product housing 18 containing the water level sensor control board 7 into the water tank 6 for a sensitivity test. After the sensitivity test is completed, if the test passes, the sensitivity test light 17 set on the body 1 will light up, so that the sensor control board and the housing can be assembled. After the sensitivity test is completed, the electric push-pull rod pulls up the ejector plate 3 to restore it to its original position, and a compression spring is set under the fixed plate 5. The spring is sleeved on the guide rod 12 and relies on the spring to return to its original position. The tested water level sensor control board 7 is taken out to complete the entire set of calibration and testing.

[0026] The above is only a specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A water level sensor control board calibration test fixture, characterized by: The utility model comprises a body, a microprocessor, a push-pull member, a pin plate, a plurality of pins and a fixed plate, wherein the microprocessor is arranged in the body, the push-pull member is installed at the top of the body, the pin plate is connected to the bottom of the push-pull member, the plurality of pins are installed at the bottom of the pin plate, the fixed plate is installed on the body so as to be movable up and down, and the fixed plate is located at the bottom of the plurality of pins, a through hole is provided in the center of the fixed plate which passes through the upper and lower parts, a water tank is provided in the body, the water tank is located directly below the through hole, the plurality of pins can press against the top of the water level sensor control board when the water level sensor control board is calibrated and be energized with the water level sensor control board, the plurality of pins are electrically connected to the microprocessor, and the microprocessor is controlled and connected to the push-pull member.

2. The water level sensor control board calibration test fixture according to claim 1, characterized in that: The upper part of the machine body is a guard plate in the shape of an inverted "U", and the top of the push-pull member is installed on the inner top of the guard plate.

3. The water level sensor control board calibration test fixture according to claim 2, characterized in that: The upper part of the machine body includes two left and right symmetrical guide rods, and the upper ends of the two guide rods pass through the fixing plate and the ejector plate in sequence and are connected and fixed to the guard plate.

4. A water level sensor control board calibration test fixture as claimed in claim 3, characterized in that: The push-pull member is an electric push rod, the top of the electric push rod is installed on the inner top of the guard plate, and the microprocessor is electrically connected to the electric push rod.

5. The water level sensor control board calibration test fixture according to claim 1, characterized in that: The top of the fixing plate is provided with an accommodating groove.

6. A water level sensor control board calibration test fixture as claimed in claim 1, characterized in that: The water tank is a cylindrical groove, and the groove is located directly below the through hole.

7. A water level sensor control board calibration test fixture according to any one of claims 4 to 6, characterized in that: The machine body is provided with a start power switch, a calibration button and a test button, and the power switch, the calibration button and the test button are all electrically connected to the microprocessor.

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