Device and method for non-contact measurement of steering and rotation angles of shaft lever

Abstract

The invention discloses a device and a method for non-contact measurement of steering and rotation angles of a shaft lever, the device comprises a sensor mounting member framed outside the shaft lever, and the shaft lever is also sleeved with a permanent magnet mounting member; wherein the permanent magnet mounting component is provided with a permanent magnet assembly, the permanent magnet assembly comprises a plurality of permanent magnet elements with different heights, a gap exists between the permanent magnet assembly and the sensor mounting component, and the plurality of permanent magnet elements are uniformly arranged on the permanent magnet mounting component at intervals; a Hall sensor is arranged on the sensor installation component and extends in the direction away from the shaft rod. The problem of abrasion caused by contact is avoided, the service life of the device is greatly prolonged, meanwhile, normal rotation of the shaft rod cannot be interfered, and the stability and accuracy of the measurement process are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of monitoring of transmission mechanisms of electrical equipment, and particularly relates to a device and method for non-contact measurement of the steering and rotation angle of a shaft rod. Background Art

[0002] In the transmission mechanisms of high-voltage electrical equipment such as circuit breakers, disconnectors, earthing switches, etc., which need to be operated, a shaft rod is often used as the main part for connection and transmission. Monitoring of the steering and rotation angle of the shaft rod has gradually become an important parameter for equipment condition monitoring. Traditional measurement methods usually use contact sensors, such as encoders or potentiometers, etc. However, the inventor has found that most of these methods currently have the following problems: For example, contact sensors need to be in direct contact with the shaft rod, which is prone to wear due to long-term use, affecting measurement accuracy and service life; in the case of equipment vibration, contact sensors may affect equipment operation and cause equipment failures; the operating mechanisms of electrical equipment adopt a closed and compact installation method, and some complex sensors cannot be arranged and installed; currently, measurement methods based on principles such as optics or magnetism can achieve measurement of the steering and rotation angle of the shaft rod, but in the case of equipment condensation or other interferences, the stability and accuracy will decrease. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for non-contact measurement of the steering and rotation angle of a shaft rod, in order to overcome the defects of the prior art. By setting a group of permanent magnetic elements with different heights on the shaft rod, and using Hall elements to collect voltage signals with different amplitudes, and combining signal processing, the measurement of the steering and rotation angle of the shaft rod can be achieved without contact, avoiding the wear problem caused by contact, greatly improving the service life of the device, and at the same time not interfering with the normal rotation of the shaft rod, ensuring the stability and accuracy of the measurement process.

[0004] The purpose of the present invention is achieved through the following technical solutions: A device for non-contact measurement of the steering and rotation angle of a shaft rod includes a sensor installation member framed outside the shaft rod, and a permanent magnet installation member is also sleeved on the shaft rod; Wherein, a permanent magnet assembly is arranged on the permanent magnet installation member, the permanent magnet assembly includes a plurality of permanent magnetic elements with different heights, there is a gap between the permanent magnet assembly and the sensor installation member, the plurality of permanent magnetic elements are evenly spaced and arranged on the permanent magnet installation member, and a Hall sensor is arranged on the sensor installation member, and the Hall sensor extends in a direction away from the shaft rod.

[0005] In one embodiment, the plurality of permanent magnetic elements are arranged in sequence according to height, and are arranged on the permanent magnet installation member from high to low or from low to high in turn.

[0006] In one embodiment, there is the same height difference between multiple permanent magnet elements in accordance with the arrangement direction of the permanent magnet elements.

[0007] In one embodiment, two sets of Hall sensors are provided on two adjacent surfaces of the sensor mounting member, and the two sets of Hall sensors are perpendicular to each other and have the same height protruding from the surface of the sensor mounting member.

[0008] In one embodiment, the permanent magnet mounting member is of a ring structure, and multiple permanent magnet elements are evenly spaced and arranged on the annular surface of the permanent magnet mounting member.

[0009] In one embodiment, the sensor mounting member is made of a non-magnetic material.

[0010] The present invention also provides a method for non-contact measurement of the steering and rotation angle of a shaft, including: sleeving a permanent magnet mounting member on the shaft and arranging a sensor mounting member outside the shaft, evenly spacing multiple permanent magnet elements with different heights along the annular surface of the permanent magnet mounting member, there is a gap between the permanent magnet elements and the sensor mounting member, and Hall sensors are arranged on the sensor mounting member, and the Hall sensors are used to collect induced voltage signals to measure the steering and rotation angle of the shaft.

[0011] In one embodiment, multiple permanent magnet elements are arranged on the permanent magnet mounting member in sequence according to the height from high to low.

[0012] In one embodiment, along the arrangement direction of the permanent magnet elements, multiple permanent magnet elements with the same height difference are adopted.

[0013] In one embodiment, two sets of Hall sensors are provided on two adjacent surfaces of the sensor mounting member, and the two sets of Hall sensors are perpendicular to each other and have the same height protruding from the surface of the sensor mounting member.

[0014] The beneficial effects of the present invention are as follows: By arranging a set of permanent magnet elements with different heights on the shaft, voltage signals with different amplitudes are collected by Hall elements, and the measurement of the steering and rotation angle of the shaft can be realized without contact by combining signal processing, avoiding the wear problem caused by contact, greatly improving the service life of the device, and at the same time, it will not interfere with the normal rotation of the shaft, ensuring the stability and accuracy of the measurement process. At the same time, this device is also not affected by common interference factors such as vibration. Compared with other non-contact measurement methods such as optical methods, it can work stably in a condensing environment, and has stronger environmental adaptability and reliability. Description of the Drawings

[0015] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the drawings. Among them: Figure 1 Shows the structural schematic diagram of the present invention; Figure 2 Shows the structural schematic diagram of the present invention in another direction; Figure 3 Shows the structural schematic diagram of the permanent magnet element of the present invention; Figure 4 Shows the signal schematic diagram of the voltage pulse when the shaft rotates counterclockwise; Figure 5 Shows the signal schematic diagram of the voltage pulse when the shaft rotates clockwise; Figure 6 Shows the angle schematic diagram corresponding to the voltage pulse signal; Figure 7 Shows the schematic diagram of the combined verification of the comparison of two groups of Hall sensor signals; In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0016] Reference numerals: 1 - Hall sensor, 2 - permanent magnet element, 3 - permanent magnet mounting member, 4 - sensor mounting member, 5 - shaft. Detailed implementation manners

[0017] The present invention will be further described below in conjunction with the drawings.

[0018] The present invention provides a device for non - contact measurement of the rotation direction and rotation angle of a shaft, as Figures 1 to 3 shown, including a sensor mounting member 4 sleeved outside the shaft 5, and a permanent magnet mounting member 3 is also sleeved on the shaft 5; Among them, a permanent magnet assembly is arranged on the permanent magnet mounting member 3. The permanent magnet assembly includes a plurality of permanent magnet elements 2 with different heights. There is a gap between the permanent magnet assembly and the sensor mounting member 4. The plurality of permanent magnet elements 2 are evenly spaced on the permanent magnet mounting member 3. A Hall sensor 1 is arranged on the sensor mounting member 4, and the Hall sensor 1 extends in a direction away from the shaft 5; It should be noted that in this embodiment, by arranging a group of permanent magnet elements 2 with different heights on the shaft 5, since the magnetic field intensities generated by the permanent magnet elements 2 with different heights are different, the amplitudes of the induced voltages acting on the Hall element are also different. That is, voltage signals with different amplitudes are collected by the Hall element. Combining signal processing can achieve non - contact measurement of the rotation direction and rotation angle of the shaft 5, avoiding the wear problem caused by contact, greatly improving the service life of the device, and at the same time not interfering with the normal rotation of the shaft 5, ensuring the stability and accuracy of the measurement process. At the same time, this device is not affected by common interference factors such as vibration. Compared with other non - contact measurement methods such as optical methods, it can work stably in a condensing environment, and has stronger environmental adaptability and reliability; Specifically, multiple permanent magnet elements 2 are arranged in sequence according to height, and are sequentially arranged on the permanent magnet mounting member 3 from high to low or from low to high. In the arrangement direction of the permanent magnet elements 2, there is the same height difference between multiple permanent magnet elements 2. The permanent magnet mounting member 3 is of an annular structure, and multiple permanent magnet elements 2 are evenly spaced on the annular surface of the permanent magnet mounting member 3, that is, as Figure 3 shown, starting from the upper end, the height values of multiple permanent magnet elements 2 form an arithmetic progression; It should be noted that, as Figure 4 and Figure 5 shown, when the shaft rod 5 rotates counterclockwise, it drives the permanent magnet element 2 to rotate counterclockwise. In the case where six permanent magnet elements 2 are evenly spaced from high to low as shown in Figure 2 , the signal collected by the Hall sensor 1 is as shown in Figure 4 . The signal changes in a gradually decreasing order in a cycle of 6 groups. When the shaft rod 5 rotates clockwise, it drives the permanent magnet element 2 to rotate clockwise. The induced voltage signal is as shown in Figure 5 . The signal changes in a gradually increasing order in a cycle of 6 groups, that is, the change order of the voltage pulse amplitude is opposite to that when rotating in the counterclockwise direction. By comparing the change order of the actually collected induced voltage signal with the preset counterclockwise and clockwise change orders, the rotation direction of the rotating shaft can be judged; As Figure 6 shown, in the case where six permanent magnet elements 2 are evenly spaced from high to low as shown in Figure 2 , the included angle between two adjacent permanent magnet elements 2 is 60 degrees. Taking the clockwise rotation of the shaft rod 5 as an example, connecting the amplitudes of the voltage pulse signals into a line, the slope of the connecting line can be calculated using the amplitudes and time difference of two signals. The rotation time of the shaft rod 5 and the starting signal amplitude can be used to calculate the rotation angle of the shaft rod 5. When the shaft rod 5 rotates counterclockwise, the calculation of the rotation angle of the shaft rod 5 is the same; In one embodiment, two sets of Hall sensors 1 are provided on two adjacent surfaces of the sensor mounting member 4, and the two sets of Hall sensors 1 are perpendicular to each other and have the same height protruding from the surface of the sensor mounting member 4; It should be noted that two sets of Hall sensors 1 are provided in the device. As Figure 1 and Figure 2 shown, the axes of the two sets of sensors are perpendicular, that is, the included angle between the sensors is 90 degrees. When the shaft rod 5 rotates counterclockwise, the induced signals on the two sets of Hall sensors 1 differ by 90 degrees, that is, by comparing the signals of the two sets of Hall sensors 1, the rotation direction and rotation angle of the shaft rod 5 can be jointly verified to ensure the accuracy of measurement; In one embodiment, the sensor mounting member 4 is made of a non-magnetic material, and each permanent magnet element 2 is of a cylindrical structure with the same-pole magnetic poles facing outward; In one embodiment, the present invention further provides a method for non-contact measurement of the steering and rotation angle of a shaft, including: sleeving a permanent magnet mounting member 3 on the shaft 5 and externally arranging a sensor mounting member 4 outside the shaft 5; arranging a plurality of permanent magnet elements 2 with different heights at equal intervals along the toroidal surface of the permanent magnet mounting member 3; there is a gap between the permanent magnet elements 2 and the sensor mounting member 4; and arranging Hall sensors 1 on the sensor mounting member 4, and using the Hall sensors 1 to collect induced voltage signals to measure the steering and rotation angle of the shaft 5; Further, arrange the plurality of permanent magnet elements 2 on the permanent magnet mounting member 3 in order of height from high to low, and along the arrangement direction of the permanent magnet elements 2, use a plurality of permanent magnet elements 2 with the same height difference; It should be noted that in this method, by arranging a set of permanent magnet elements 2 with different heights on the shaft 5, since the magnetic field intensities generated by the permanent magnet elements 2 with different heights are different, the amplitudes of the induced voltages acting on the Hall elements are also different, that is, voltage signals with different amplitudes are collected by the Hall elements. Combining signal processing can achieve non-contact measurement of the steering and rotation angle of the shaft 5, avoiding the wear problem caused by contact, greatly improving the service life of the device, and at the same time not interfering with the normal rotation of the shaft 5, ensuring the stability and accuracy of the measurement process. At the same time, this device is also not affected by common interference factors such as vibration. Compared with other non-contact measurement methods such as optics, it can work stably in a condensing environment, and has stronger environmental adaptability and reliability; In one embodiment, arrange two sets of Hall sensors 1 on two adjacent surfaces of the sensor mounting member 4. The two sets of Hall sensors 1 are perpendicular to each other and the heights protruding from the surface of the sensor mounting member 4 are the same. That is, by comparing the signals of the two sets of Hall sensors 1, the steering and rotation angle of the shaft 5 can be jointly verified to ensure the accuracy of the measurement; In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0019] Although the present invention has been described herein with reference to particular embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Accordingly, it should be understood that numerous modifications may be made to the exemplary embodiments, and other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a separate embodiment may be used in other described embodiments.

Claims

1. A device for non-contact measurement of the steering and rotation angle of a shaft rod, characterized in that It includes a sensor mounting member sleeved outside the shaft, and a permanent magnet mounting member is also sleeved on the shaft; Among them, a permanent magnet assembly is arranged on the permanent magnet mounting member. The permanent magnet assembly includes a plurality of permanent magnet elements with different heights. There is a gap between the permanent magnet assembly and the sensor mounting member. The plurality of permanent magnet elements are evenly spaced on the permanent magnet mounting member. A Hall sensor is arranged on the sensor mounting member, and the Hall sensor extends away from the shaft.

2. The non-contact measuring device for the steering and rotation angle of a shaft rod according to claim 1, characterized in that The plurality of permanent magnet elements are arranged in sequence according to their heights and are arranged on the permanent magnet mounting member from high to low or from low to high in turn.

3. The device for non-contact measurement of the steering direction and rotation angle of a shaft according to claim 2, characterized in that, According to the arrangement direction of the permanent magnet elements, there is the same height difference between the plurality of permanent magnet elements.

4. The device for non-contact measurement of the steering direction and rotation angle of a shaft rod according to claim 1, characterized in that, Two sets of Hall sensors are arranged on two adjacent surfaces of the sensor mounting member. The two sets of Hall sensors are perpendicular to each other and protrude from the surface of the sensor mounting member by the same height.

5. The device for non-contact measurement of the steering and rotation angle of a shaft rod according to claim 1, characterized in that The permanent magnet mounting member is of a circular ring structure, and the plurality of permanent magnet elements are evenly spaced on the ring surface of the permanent magnet mounting member.

6. The device and method for non-contact measurement of the steering and rotation angle of a shaft rod according to claim 1, characterized in that, The sensor mounting member is made of a non-magnetic material.

7. A method for non-contact measurement of the steering direction and rotation angle of a shaft rod, characterized in that, It includes: Sleeve a permanent magnet mounting member on the shaft and frame a sensor mounting member outside the shaft. Evenly space a plurality of permanent magnet elements with different heights along the ring surface of the permanent magnet mounting member. There is a gap between the permanent magnet elements and the sensor mounting member. And arrange a Hall sensor on the sensor mounting member. Use the Hall sensor to collect the induced voltage signal to measure the rotation direction and rotation angle of the shaft.

8. A method for non-contact measurement of the steering and rotation angle of a shaft lever according to claim 7, characterized in that, Arrange the plurality of permanent magnet elements on the permanent magnet mounting member in sequence according to their heights from high to low.

9. A method for non-contact measurement of the steering and rotation angle of a shaft rod according to claim 8, characterized in that, Adopt a plurality of permanent magnet elements with the same height difference along the arrangement direction of the permanent magnet elements.

10. A method for non-contact measurement of the steering and rotation angle of a shaft rod according to claim 7, characterized in that, Arrange two sets of Hall sensors on two adjacent surfaces of the sensor mounting member. The two sets of Hall sensors are perpendicular to each other and protrude from the surface of the sensor mounting member by the same height.

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