Angle sensing device

Abstract

The utility model discloses an angle sensing device, which comprises a base body with a base body cavity, a cover body which is connected with the base body and seals one end of the base body cavity, a rotating shaft part which is positioned in the base body cavity and is provided with a shaft cavity and a magnet placement cavity, a magnet positioned in the magnet placement cavity, and a control panel which is positioned in the base body cavity and is provided with a sensing chip, wherein the sensing chip and the magnet are mutually sensed and obtain an angle sensing signal. The sensor has the advantages that sensing angle output is more stable, the problem of abnormal angle output is solved, the measurement precision of the sensor is improved, meanwhile, epoxy resin is filled and sealed inside to ensure product sealing, external rainwater invasion is prevented, and reliability is ensured.

Description

Technical Field

[0001] The utility model relates to the field of sensing technology, in particular to an angle sensing device. Background Art

[0002] An angle sensor is a sensor that senses an angle and converts it into a usable output signal. It is used to measure the position, angle, and direction of shafts, motors, and other rotating components. However, existing angle sensors are prone to angular output anomalies, positional offsets, and large measurement errors, which affect accuracy and prevent rapid or accurate response. Similar technologies can be found in Chinese invention patent CN100520279C, necessitating improvements. Utility Model Content

[0003] In order to overcome the above shortcomings, the utility model provides an angle sensing device, which adds a torsion spring on the periphery of the magnet shaft to protect the sensor from damage in harsh working environments. The sensing angle output will be more stable. The induction magnet uses a square magnet to avoid the magnet position offset that occurs in circular magnets, solve the problem of abnormal angle output, and improve the measurement accuracy of the sensor.

[0004] In order to achieve the purpose of the utility model, the utility model proposes an angle sensing device, which includes a base having a base cavity, a cover connected to the base and closing one end of the base cavity, a rotating shaft portion located in the base cavity and having an axis cavity and a magnet placement cavity, a magnet located in the magnet placement cavity, and a control board located in the base cavity and having a sensing chip, wherein the sensing chip and the magnet sense each other and obtain an angle sensing signal.

[0005] On the basis of the above technical solution, the following subsidiary technical solutions are further included:

[0006] Preferably, the shaft cavity and the magnet placement cavity are independently provided, and the central axis of the shaft cavity and the central axis of the magnet placement cavity are on the same straight line.

[0007] Preferably, the device further comprises a resin portion located in the base cavity and integrally injection-molded with the control board.

[0008] Preferably, the cover and the base are welded by ultrasonic welding.

[0009] Preferably, the device further comprises a torsion spring with one end fixed to the rotating shaft portion and sleeved on the periphery of the rotating shaft portion, and a rotating shaft cover plate for shielding the magnet placement cavity.

[0010] Preferably, the rotating shaft portion is provided with a plurality of positioning protrusions, and the rotating shaft cover is provided with a plurality of positioning grooves cooperating with the positioning protrusions.

[0011] Preferably, the magnet is a rectangular permanent magnet.

[0012] Preferably, it further comprises a terminal with one end connected to the control board and the other end exposed to the outside, wherein the extending direction of the exposed end of the terminal is perpendicular to the central axis direction of the rotating shaft.

[0013] Preferably, the base body includes a rotating shaft receiving chamber located in the base body cavity and receiving the rotating shaft portion and the torsion spring.

[0014] Preferably, the resin portion is axially located between the cover body and the shaft cover plate.

[0015] The utility model has the following beneficial effects: the sensing angle output is more stable, the problem of abnormal angle output is solved, and the measurement accuracy of the sensor is improved. At the same time, the internal epoxy resin is potted to ensure the product sealing, prevent the intrusion of external rainwater, and ensure reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 This is the main view of the utility model;

[0019] Figure 3 This is an exploded view of the utility model;

[0020] Figure 4 for Figure 2 Sectional view along line AA. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Example: Figure 1-4 As shown, the utility model discloses an embodiment of an angle sensing device, which includes: a base 1000 having a base cavity 1020, a cover 1200 connected to the base 1000 and closing one end of the base cavity 1020, a rotating shaft portion 2000 located in the base cavity 1020 and having an axis cavity 2020 and a magnet placement cavity 2040, a magnet 2400 located in the magnet placement cavity 2040, and a control board 3000 located in the base cavity 1020 and having a sensing chip 3200, wherein the sensing chip 3200 and the magnet 2400 sense each other and obtain an angle sensing signal.

[0023] The base 1000 includes a shaft receiving chamber 1040 located in the base cavity 1020 and accommodating the shaft portion 2000 and the torsion spring 4000, wherein the cover body 1200 and the peripheral side of the base 1000 are ultrasonically welded to ensure that the base cavity 1020 is isolated and sealed from the outside, avoiding the use of an O-ring, preventing the intrusion of rainwater or foreign objects from the outside, and ensuring reliable operation.

[0024] The shaft portion 2000 is disposed within the shaft receiving chamber 1040, and the shaft cavity 2020 and the magnet placement cavity 2040 are independently disposed, and the shaft cavity 2020 is used to accommodate the mating shaft. The central axis of the shaft cavity 2020 and the central axis of the magnet placement cavity 2040 are aligned in the same straight line. The shaft portion 2000 is provided with a plurality of positioning protrusions 2060 located outside the magnet placement cavity 2040, and the magnet placement cavity 2040 is used to place a magnet 2400, wherein the magnet 2400 is a rectangular permanent magnet having an N pole and an S pole. More preferably, the magnet 2400 is a square permanent magnet to avoid the magnet position offset that occurs when magnets of other shapes are used in the past, resulting in abnormal angular output.

[0025] The control board 3000 is provided with a sensing chip 3200 and a single-chip microcomputer electrically connected to the sensing chip 3200, wherein the sensing chip 3200 and the magnet 2400 mutually sense each other to obtain an angle sensing signal. Preferably, the sensing chip 3200 is a Hall effect sensing chip. The control board 3000 is fixed to the base 1000 by screws 5200. One end of the terminal 3400 is connected to the control board 3000, while the other end is exposed and electrically connected to the external circuit. The extension direction of the terminal 3400 is perpendicular to the central axis direction of the rotating shaft portion 2000. The control board 3000 is provided with a plurality of through holes. The screws pass through some of the through holes.

[0026] This embodiment also includes a torsion spring 4000 with one end fixed to the shaft portion 2000 and sleeved around the shaft portion 2000, and the other end fixed within the shaft receiving chamber 1040, as well as a shaft cover 2200 that shields the magnet housing cavity 2040. The shaft cover 2200 has several fixing posts 2240 on one end and an annular positioning groove on the other end that mates with the positioning protrusion 2060. The fixing posts 2240 are positioned to correspond to the perforations in the control board 3000, and the perforations allow the fixing posts 2240 to pass through. This secures the shaft cover 2200 to the control board 3000, and allows the shaft portion 2000 to rotate relative to the shaft cover 2200 and be axially connected. The torsion spring 4000 effectively reduces the gap with the mating shaft in the application environment, resulting in a more stable sensor angle output.

[0027] The resin portion 5000 is axially positioned between the cover 1200 and the shaft cover 2200. It is integrally injection-molded with the control board 3000, ensuring reliable operation of the control board 3000 and preventing intrusion of rainwater. Furthermore, the shaft cover 2200 and base 1000 utilize a tight-fitting structure, isolating the shaft housing 1040 during epoxy resin encapsulation, preventing the epoxy from entering. This internal epoxy encapsulation forms the resin portion 5000 as the primary seal, followed by a secondary seal achieved through ultrasonic welding between the cover 1200 and base 1000. This fully ensures the product's tightness and long lifespan.

[0028] During operation, a matching shaft is inserted into the shaft cavity 2020 of the rotating shaft part 2000, and then the matching shaft starts to rotate at high speed, driving the rotating shaft part 2000 to rotate, and causing the magnet 2400 to rotate accordingly, thereby forming a rotating and changing magnetic field. The sensing chip 3200 of the control board 3000 feeds back a signal to the microcontroller based on the changing magnetic field signal, thereby realizing the angle sensing signal output.

[0029] The advantages of the utility model are: the sensing angle output is more stable, the problem of abnormal angle output is solved, the measurement accuracy of the sensor is improved, and the internal epoxy resin is potted to ensure the product sealing, prevent the intrusion of external rainwater, and ensure reliability.

[0030] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with this technical field can make several modifications and improvements without departing from the creative concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. An angle sensing device, characterized in that It includes: A base (1000) having a base cavity (1020), a cover (1200) connected to the base (1000) and sealing one end of the base cavity (1020), a rotating shaft (2000) located in the base cavity (1020) and having an axis cavity (2020) and a magnet placement cavity (2040), a magnet (2400) located in the magnet placement cavity (2040), and a control board (3000) located in the base cavity (1020) and having a sensing chip (3200), wherein the sensing chip (3200) and the magnet (2400) sense each other and obtain an angle sensing signal.

2. The angle sensing device according to claim 1, wherein: The shaft cavity (2020) and the magnet placement cavity (2040) are independently arranged, and the central axis of the shaft cavity (2020) and the central axis of the magnet placement cavity (2040) are on the same straight line.

3. The angle sensor device according to claim 2, characterized in that It also includes a resin portion (5000) located in the base cavity (1020) and integrally injection-molded with the control board (3000).

4. The angle sensing device according to claim 3, wherein: The cover (1200) and the base (1000) are welded by ultrasonic welding.

5. The angle sensor device according to claim 3 or 4, characterized in that It also includes a torsion spring (4000) with one end fixed on the rotating shaft portion (2000) and sleeved on the periphery of the rotating shaft portion (2000), and a rotating shaft cover plate (2200) for shielding the magnet placement cavity (2040).

6. The angle sensing device according to claim 5, characterized in that: The rotating shaft portion (2000) is provided with a plurality of positioning protrusions (2060), and the rotating shaft cover plate (2200) is provided with a plurality of positioning grooves that cooperate with the positioning protrusions (2060).

7. The angle sensing device according to claim 1, 2, 3 or 4, characterized in that: The magnet (2400) is a rectangular permanent magnet.

8. The angle sensing device according to claim 5, characterized in that: It also includes a terminal (3400) with one end connected to the control board (3000) and the other end exposed to the outside, wherein the extension direction of the exposed end of the terminal (3400) is perpendicular to the central axis direction of the rotating shaft (2000).

9. The angle sensing device according to claim 5, characterized in that: The base (1000) includes a rotating shaft receiving chamber (1040) located in the base cavity (1020) and receiving the rotating shaft portion (2000) and the torsion spring (4000).

10. The angle sensing device according to claim 9, characterized in that: The resin portion (5000) is axially located between the cover body (1200) and the shaft cover plate (2200).

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