Spacing-adjustable Hall sensor rotating speed testing device

Abstract

The invention belongs to the technical field of performance testing, and particularly relates to a Hall sensor rotating speed testing device with an adjustable interval. The ball screw motor and the rotary encoder are connected with the ball screw support, the ball screw support is used for fixing and supporting the screw, the nut is fixed on the screw, the rotary motion of the nut is converted into linear motion to drive the workbench to move, the limit switch is installed on the ball screw support, and the sensor connector is fixed on the workbench. The Hall sensor is fixed in the sensor connector, the control signal processing module is connected with the rotating shaft motor, the rotating shaft is installed above the rotating shaft motor, the magnetic steel A and the magnetic steel B are symmetrically installed on the rotating shaft and used for triggering the Hall sensor, and the limiting switch is connected with the control signal processing module for control. The performance of the Hall sensor is tested, so that the safety and the reliability of the nuclear power station are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of performance testing, and particularly relates to a Hall sensor rotational speed testing device with adjustable spacing. Background Art

[0002] The Hall sensor measures the rotational speed through magnetic steel with alternating opposite polarities on the rotating shaft. Due to its non-contact measurement, long service life, resistance to oil stains and dust, and fast response (microsecond level), which is suitable for high-speed scenarios and other advantages, the Hall sensor is widely used in industries such as industrial control, consumer electronics, and the automotive industry. The Hall sensor is also used for measuring the rotational speed of the steam-driven auxiliary feed water pump in the nuclear power plant auxiliary feed water system, providing key data, over-limit alarm and protection, safety interlock functions, etc. for operators. Therefore, the measurement accuracy of the pump's rotational speed is also crucial.

[0003] In actual on-site work, the measurement accuracy of the Hall sensor speed is affected not only by environmental factors such as temperature and humidity, but also by the installation distance deviation between the sensor and the magnet. An overly large gap will cause the magnetic field to weaken and signal loss. Therefore, a Hall sensor rotational speed testing device with adjustable spacing is designed to simulate the influence brought by the actual on-site installation gap, so as to accurately test the specific working range value of the Hall sensor, improve the reliability of the equipment, and ensure the safe and stable operation of the unit. This testing device can also be used for testing sensor spare parts to check whether they meet the on-site use requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a Hall sensor rotational speed testing device with adjustable spacing to test the performance of the Hall sensor, thereby improving the safety and reliability of nuclear power plants.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A Hall sensor rotational speed testing device with adjustable spacing, a ball screw motor and a rotary encoder are connected to a ball screw support. The ball screw support is used to fix and support the ball screw. A nut is fixed on the ball screw, and its rotational motion is converted into linear motion to drive the workbench to move. A limit switch is installed on the ball screw support. A sensor connector is fixed on the workbench, and a Hall sensor is fixed in the sensor connector. A control signal processing module is connected to the rotating shaft motor. The rotating shaft is installed above the rotating shaft motor. Magnet A and magnet B are symmetrically installed on the rotating shaft to trigger the Hall sensor. The limit switch is connected to the control signal processing module for control.

[0006] The control signal processing module adjusts the rotational speed in real time, sets the target gap, and processes the data sent by the Hall sensor and converts it into rotational speed.

[0007] The sensor connector is fixed on the workbench by screws.

[0008] The Hall sensor is fixed in the sensor connector by screws.

[0009] The limit switches are installed at the start and end of the ball screw stroke.

[0010] Spacing adjustment process: The control signal processing module sends instructions to drive the ball screw motor and the rotary encoder, and then drives the ball screw to rotate. The nut converts the rotational motion into a linear motion, driving the workbench to move forward and backward.

[0011] Use the rotary encoder to calculate the displacement. Calculate the linear displacement by recording the number of revolutions of the ball screw motor and combining it with the pitch of the ball screw. At initialization, manually measure the initial distance between the Hall sensor and the target wheel. Calculate the real-time distance between the Hall sensor and the target wheel through the above steps and display it on the control signal processing module.

[0012] Limit protection mechanism: The limit switches are installed at the start and end of the ball screw stroke. When the workbench touches the limit switch, a signal is immediately sent to the control signal processing module to forcibly stop the movement and prevent damage to the ball screw due to overshoot.

[0013] Rotational speed detection: After the control signal processing module sets the rotational speed, it controls the rotation of the rotating shaft motor. The Hall sensor detects the magnetic field changes of the magnetic steel A and magnetic steel B on the rotating shaft, outputs a pulse signal, and the pulse signal is sent back to the control signal processing module for conversion into the rotational speed.

[0014] The beneficial effects achieved by the present invention are as follows: 1. This test device simulates the actual on-site work and can simultaneously simulate the performance of the Hall sensor under different rotational speeds and distances. 2. The data obtained from this test device can be used for the actual installation work of the Hall sensor, greatly reducing the on-site work time and improving work efficiency. 3. This test device is adapted to different sizes of rotational speed sensor connectors, with a wide application range and strong practicability. 4. This test device adds a limit protection mechanism to prevent damage to the ball screw due to overshoot. Description of the Drawings

[0015] Figure 1 It is a system diagram of a Hall sensor rotational speed test device with adjustable spacing; Figure 2 It is a functional flow diagram of a Hall sensor rotational speed test device with adjustable spacing; In the figure: 1. Ball screw motor and rotary encoder; 2. Ball screw support; 3. Limit switch; 4. Nut; 5. Ball screw; 6. Workbench; 7. Sensor connector; 8. Hall sensor; 9. Rotating shaft; 10. Magnet A; 11. Magnet B; 12. Rotating shaft motor; 13. Control signal processing module. Specific embodiments

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The Hall sensor measures the rotational speed through magnets with alternating opposite polarities on the rotating shaft. Due to the installation distance deviation between the sensor and the magnet on-site, it will affect the rotational speed measurement accuracy. This test platform simulates the on-site working environment, changes the distance between the sensor and the rotating shaft, tests its appropriate installation distance, and can also test whether the accuracy of the Hall sensor is affected at different installation distances and rotational speeds, so as to judge whether the Hall sensor can adapt to the on-site environment.

[0018] The present invention can accurately adjust the gap between the Hall sensor and the rotating target wheel (0 - 20 mm, accuracy ±0.02 mm), simulate different rotational speeds (0 - 10000 rpm), test the stability of the sensor output signal, and collect data in real time and analyze the accuracy.

[0019] As Figure 1 shown, a Hall sensor rotational speed test device with adjustable spacing consists of a spacing adjustment mechanism, rotational speed detection, a limit protection mechanism, and a control signal processing module 13. The spacing adjustment mechanism consists of a ball screw motor and rotary encoder 1, a ball screw, a limit switch 3, a Hall sensor 8, and a sensor connector 7. The ball screw motor and rotary encoder 1 are connected to the ball screw support 2, and the ball screw support 2 is used to fix and support the ball screw 5. The nut 4 is fixed on the ball screw 5, and its rotational motion is converted into linear motion to drive the workbench 6 to move. The limit switch 3 is installed on the ball screw support 2 to protect the platform. The sensor connector 7 is fixed on the workbench 6 by screws and can be replaced according to different models of Hall sensors 8. The Hall sensor 8 is fixed in the sensor connector 7 by screws.

[0020] The rotational speed detection mechanism consists of: a Hall sensor 8, a rotating shaft 9, a magnet A 10, a magnet B 11, and a rotating shaft motor 12. The control signal processing module 13 is connected to the rotating shaft motor 12 and sends control signals to it. The rotating shaft 9 is installed above the rotating shaft motor 12, and the motor drives it to rotate. The magnet A 10 and the magnet B 11 are symmetrically installed on the rotating shaft 9 to trigger the Hall sensor 8.

[0021] The limit protection mechanism is realized through the limit switch 3. The limit switch 3 is installed at the starting point and the ending point of the stroke of the ball screw 5. The switch is connected to and controlled by the control signal processing module 13 to protect the platform by controlling the start and stop of the nut 4.

[0022] The control signal processing module 13 can adjust the rotation speed in real time and set the target clearance (manual input or automatic frequency sweeping mode). And it processes the data sent by the Hall sensor 8 and converts it into the rotation speed.

[0023] As Figure 2 shown, the spacing adjustment process: The control signal processing module 13 sends an instruction to drive the ball screw motor. The motor drives the ball screw 5 to rotate. The nut 4 converts the rotational motion into a linear motion, driving the workbench 6 to move forward / backward with a stroke of 0 - 20 mm and a repeat positioning accuracy of ±0.02 mm. The Hall sensor 8 is fixed to the workbench 6 through the sensor connector 7. The present invention adopts a modular design and can replace sensor connectors 7 of different models and different sizes. The rotary encoder is used to calculate the displacement. The encoder is installed on the drive motor, and the linear displacement is calculated by recording the number of revolutions of the motor (combined with the pitch of the ball screw). During system initialization (such as the zero position), the initial distance between the Hall sensor and the target wheel is manually measured, and through these two steps, the real-time distance between the Hall sensor and the target wheel can be calculated and displayed on the control signal processing module 13.

[0024] Limit protection mechanism: The limit switch 3 is installed at the starting point and the ending point of the stroke of the ball screw 5 (at 10 mm from the end of the stroke). When the platform touches the limit switch, the switch immediately sends a signal to the control signal processing module 13 to force the movement to stop and prevent damage to the ball screw due to overshoot.

[0025] Rotation speed detection: After the control signal processing module 13 sets the rotation speed, it controls the rotation of the rotating shaft motor 12. The Hall sensor 8 detects the magnetic field changes of the magnetic steel A10 and the magnetic steel B11 on the rotating shaft 9 and outputs a pulse signal. The pulse signal is sent back to the control signal processing module 13 and converted into the rotation speed (RPM).

[0026] The key points and protection points of the present invention are: Precision adjustment: The ball screw can adjust the clearance between the Hall sensor and the rotating target wheel, which is convenient for testing the working range of the Hall sensor and adapting to different sizes of measured objects. Modular expansion: The test platform is adapted to sensor connectors of different sizes for the rotation speed, with a wide application range and strong practicability.

Claims

1. An adjustable-spacing Hall sensor rotational speed testing device, characterized in that: The ball screw motor, rotary encoder are connected to the ball screw support. The ball screw support is used to fix and support the screw. The nut is fixed on the screw, and its rotational motion is converted into linear motion to drive the workbench to move. The limit switch is installed on the ball screw support, the sensor connector is fixed on the workbench, and the Hall sensor is fixed in the sensor connector. The control signal processing module is connected to the rotary shaft motor. The rotary shaft is installed above the rotary shaft motor. Magnet A and Magnet B are symmetrically installed on the rotary shaft and used to trigger the Hall sensor. The limit switch is connected to the control signal processing module for control.

2. The adjustable-spacing Hall sensor rotational speed testing device according to claim 1, wherein: The control signal processing module adjusts the rotational speed in real time, sets the target gap, and processes the data sent by the Hall sensor and converts it into rotational speed.

3. The adjustable-spacing Hall sensor rotational speed testing device according to claim 1, wherein: The sensor connector is fixed on the workbench by screws.

4. The adjustable-spacing Hall sensor rotational speed testing device according to claim 1, characterized in that: The Hall sensor is fixed in the sensor connector by screws.

5. The adjustable-spacing Hall sensor rotational speed testing device according to claim 1, wherein: The limit switches are installed at the start and end points of the screw stroke.

6. The adjustable-spacing Hall sensor rotational speed testing device according to claim 1, wherein: Spacing adjustment process: The control signal processing module sends instructions to drive the ball screw motor and rotary encoder, and then drives the screw to rotate. The nut converts the rotational motion into linear motion to drive the workbench to move forward and backward.

7. The adjustable-spacing Hall sensor rotational speed testing device according to claim 6, wherein: Use the rotary encoder to calculate the displacement. Calculate the linear displacement by recording the number of revolutions of the ball screw motor combined with the screw pitch. At initialization, manually measure the initial distance between the Hall sensor and the target wheel, calculate the real-time distance between the Hall sensor and the target wheel through the above steps, and display it on the control signal processing module.

8. The adjustable-spacing Hall sensor rotational speed testing device according to claim 1, wherein: Limit protection mechanism: The limit switches are installed at the start and end points of the screw stroke. When the workbench touches the limit switch, a signal is immediately sent to the control signal processing module to force the movement to stop and prevent damage caused by overshoot of the screw.

9. The adjustable-spacing Hall sensor rotational speed testing device according to claim 1, wherein: Rotational speed detection: After the control signal processing module sets the rotational speed, it controls the rotation of the rotary shaft motor. The Hall sensor detects the magnetic field changes of Magnet A and Magnet B on the rotary shaft, outputs a pulse signal, and the pulse signal is sent back to the control signal processing module and converted into rotational speed.

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