Hall length measurement sensor of worm and gear structure

Abstract

The utility model discloses a Hall length measurement sensor of a worm and gear structure, which comprises a shell assembly provided with a steel wire rope wound on a winding drum. The winding drum is directly or indirectly connected with the center shaft, and the center shaft is connected with a worm of the worm and gear assembly. The worm and gear assembly is provided with a magnet, the magnet rotates along with a worm gear, and the magnet and the single-circle Hall chip on the circuit board are correspondingly installed. The center shaft is directly or indirectly connected with an inner ring of the coil spring, an outer ring of the coil spring is connected with the shell assembly, and the shell assembly is provided with a rope head assembly. The large transmission ratio is achieved through cooperation of the worm gear and the worm, a potentiometer is replaced by the Hall chip and the magnet, and the size of the sensor is reduced; the single-circle Hall chip and the magnet are adopted to detect the number of rotation circles of the winding drum, length measurement is achieved, reliability and detection precision are improved, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of length measuring sensors, and in particular to a Hall length measuring sensor with a worm gear structure. Background Technology

[0002] Length measuring sensors are widely used in length measurement of various systems in engineering machinery, such as the extended length of outriggers and booms. The size and reliability of length measuring sensors are always key considerations during the design process.

[0003] Existing length measuring sensors typically use a gear set in conjunction with a potentiometer. The extension or retraction of a wire rope drives the rotation of a drum, central shaft, and gear assembly, with the potentiometer following the gear's rotation to measure the wire rope length. In this length measuring technology, for sensors with large measurement ranges, the gear reduction ratio is high, significantly increasing the gear's size and resulting in a bulky sensor structure, making installation difficult in confined spaces such as crane outriggers. Furthermore, the secure fastening of the gear and potentiometer carries a risk of loosening, reducing the sensor's reliability.

[0004] Existing length measurement solutions, such as patent CN213778898U, use a combination of Hall effect chip, loop counting chip, and power module for length measurement. This method has risks of poor power supply reliability and unstable power supply, and it has high requirements for the power module, resulting in high cost.

[0005] Therefore, it is necessary to develop new Hall effect length measuring sensors to reduce sensor size, improve reliability, and lower costs. Utility Model Content

[0006] Purpose of the utility model: To address the shortcomings and defects of the existing technology, this utility model provides a Hall effect length measuring sensor with a worm gear structure. By cooperating with the worm gear, a larger transmission ratio is achieved. The Hall effect chip and magnet replace the potentiometer, reducing the sensor size. A single-turn Hall effect chip and magnet are used to detect the number of rotations of the drum, thereby realizing length measurement, improving reliability and detection accuracy, and reducing costs.

[0007] Technical Solution: This utility model discloses a Hall effect length measuring sensor with a worm gear structure, characterized in that: it includes a housing assembly, which has a steel wire rope wound on a drum; the drum is directly or indirectly connected to a central shaft, which is connected to the worm of the worm gear assembly; the worm gear assembly has a magnet that rotates with the worm gear, and the magnet is installed correspondingly to a single-turn Hall effect chip on a circuit board; the central shaft is directly or indirectly connected to the inner ring of a coil spring, the outer ring of the coil spring is connected to the housing assembly, and the housing assembly has a rope end assembly.

[0008] The worm gear assembly includes a magnet, a worm gear, a worm, a rotating shaft, a bearing, and a support.

[0009] The worm wheel is connected to the magnet and the worm is connected to the worm. The worm wheel is located on the rotating shaft, which is connected to the bracket through bearings on both sides.

[0010] The circuit board includes a circuit board substrate and a single-turn Hall effect chip.

[0011] The single-turn Hall chip is mounted on the circuit board substrate.

[0012] The single-loop Hall chip is placed parallel to the magnet at a certain distance.

[0013] The rope end assembly is connected to the external test object, and the rope end assembly is stretched or retracted with the external moving parts.

[0014] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: This invention achieves length measurement through the cooperation of a worm gear and a single-turn Hall chip. The worm gear structure achieves a large transmission ratio. Replacing the potentiometer in existing technologies with a magnet and Hall chip significantly reduces the sensor size, meeting the application requirements of the sensor and solving the problem of limited application in confined spaces due to the large sensor size, such as the narrow installation space of crane outriggers. Without the potentiometer, the risk of loosening of the gear and potentiometer is eliminated, improving the reliability of the sensor. This invention achieves non-contact length measurement by integrating a magnet and a single-turn Hall chip into the worm gear, replacing the traditional mechanical contact potentiometer length measurement and the combined length measurement method of Hall chip + loop counting chip + power module. This invention eliminates the need for a power supply and loop counting chip, greatly improving sensor reliability and reducing sensor cost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the worm gear assembly of this utility model;

[0017] Figure 3 This is a schematic diagram of the circuit board structure of this utility model;

[0018] In the diagram, 1 is the housing assembly; 2 is the wire rope; 3 is the central shaft; 4 is the worm gear assembly; 5 is the circuit board; 6 is the coil spring; 7 is the drum; 8 is the rope end assembly; 41 is the magnet; 42 is the worm gear; 43 is the worm; 44 is the rotating shaft; 45 is the bearing; 46 is the bracket; 51 is the circuit board substrate; and 52 is the single-turn Hall effect chip. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] This utility model discloses a length measuring sensor: a sensor that converts the linear motion of a component into an electrical signal to measure the extension length. It mainly consists of a wire rope, a drum, a coil spring, and necessary circuit modules, and is primarily used in crane systems for length measurement of systems such as the boom and outriggers. The drum is a cylindrical component that stores the wound cable or wire rope, rotating in both directions as the wire rope moves with the connecting component. The coil spring is a planar spiral spring made of spring steel strip, capable of storing torque and providing a certain amount of return force.

[0021] like Figure 1 , 2 3. The Hall effect length measuring sensor with a worm gear structure of this utility model includes a housing assembly 1, inside which a steel wire rope 2 is wound on a drum 7; the drum 7 is directly or indirectly connected to a central shaft 3, and the central shaft 3 is connected to the worm 43 of a worm gear assembly 4; the worm gear assembly 4 is provided with a magnet 41, which rotates with the worm wheel 42, and the magnet 41 is correspondingly installed with a single-turn Hall chip 52 on a circuit board 5; the central shaft 3 is directly or indirectly connected to the inner ring of a coil spring 6, and the outer ring of the coil spring 6 is connected to the housing assembly 1; the housing assembly 1 is provided with a rope end assembly 8. The single-turn Hall chip 52 mainly detects the rotation angle of the magnet.

[0022] The worm gear assembly 4 of this utility model includes a magnet 41, a worm gear 42, a worm 43, a rotating shaft 44, bearings 45, and a bracket 46. The worm gear 42 is connected to the magnet 41 and the worm 43. The worm gear 42 is located on the rotating shaft 44, which is connected to the bracket 46 via bearings 45 on both sides. The circuit board 5 includes a circuit board substrate 51 and a single-turn Hall chip 52. The single-turn Hall chip 52 is disposed on the circuit board substrate 51. The single-turn Hall chip 52 and the magnet 41 are placed parallel to each other at a certain distance. The rope end assembly 8 is connected to an external test object, and the rope end assembly 8 is stretched or retracted with the external moving parts.

[0023] In use, the rope end assembly 8 on the length measuring sensor is connected to the external measured object and extends or retracts with the external moving parts. When the wire rope 2 extends, the coil spring 6 rotates with the central shaft 3 to store spring force. The extension and retraction of the wire rope 2 drives the rotation of the drum 7 and the central shaft 3. The worm gear 43 rotates with the central shaft 3 and drives the worm wheel 42 to rotate. The rotating shaft 44 is fixedly connected to the worm wheel 42 and rotates together. A magnet 41 is installed at the end of the rotating shaft 44 and drives the magnet 41 to rotate. The magnet 41 and the single-turn Hall chip 52 on the circuit board are placed parallel to each other at a certain distance. The cooperation between the magnet 41 and the circuit board 5 is used to measure the intensity and direction change of the rotating magnetic field and emit an electrical signal to realize the length measuring function. When the external moving parts retract, the spring force stored in the coil spring 6 when the wire rope 2 is extended drives the drum 7 to rotate in the opposite direction (relative to when the wire rope is extended). The reverse rotation of the drum 7 causes the wire rope 2 to be wound around it, thus achieving the retraction of the wire rope 2. Through the rotational movement of the worm gear 42 and worm 43, the end of the rotating shaft 44 and the magnet 41 are rotated. Then, through the change in the magnetic field between the magnet 41 and the single-turn Hall chip 52, a length signal is output. Since the worm gear 42 only rotates one tooth pitch for every one rotation of the worm 43, a larger transmission ratio can be obtained, which can reduce the size of the sensor and increase the application range of the sensor.

[0024] The worm gear assembly of this invention has a built-in magnet at the end of its rotating shaft. The magnet rotates with the shaft and is installed parallel to and directly opposite the single-turn Hall chip. The transmission structure adopts a worm gear structure, which, in conjunction with the single-turn Hall chip, enables non-contact length measurement. This worm gear structure provides a large transmission ratio, eliminates the need for a power supply and a turn-counting chip, improves sensor reliability, and reduces costs.

[0025] This invention achieves length measurement by using a worm gear and a single-turn Hall effect chip. The worm gear structure enables a large transmission ratio. By replacing the potentiometer in existing technologies with a magnet and Hall effect chip, the sensor size can be significantly reduced, meeting the requirements of various applications and solving the problem of limited space due to large sensor size, such as the confined installation space of crane outriggers. Without the potentiometer, the risk of loosening of the gear and potentiometer is eliminated, improving sensor reliability. This invention achieves non-contact length measurement by integrating a magnet and a single-turn Hall effect chip into the worm gear, replacing traditional mechanical contact potentiometer length measurement and the combined length measurement method of Hall effect chip + loop counting chip + power module. This invention eliminates the need for a power supply and loop counting chip, greatly improving sensor reliability and reducing sensor cost.

Claims

1. A Hall effect length measuring sensor with a worm gear structure, characterized in that: The system includes a housing assembly (1), which contains a steel wire rope (2) wound on a drum (7); the drum (7) is connected to a central shaft (3), which is connected to the worm (43) of a worm gear assembly (4); the worm gear assembly (4) is equipped with a magnet (41), which rotates with the worm gear (42), and the magnet (41) is installed in correspondence with a single-turn Hall chip (52) on a circuit board (5); the central shaft (3) is connected to the inner ring of a coil spring (6), the outer ring of the coil spring (6) is connected to the housing assembly (1), and the housing assembly (1) is equipped with a rope end assembly (8).

2. The Hall effect length measuring sensor with a worm gear structure according to claim 1, characterized in that: The worm gear assembly (4) includes a magnet (41), a worm gear (42), a worm (43), a rotating shaft (44), a bearing (45), and a bracket (46).

3. The Hall effect length measuring sensor with a worm gear structure according to claim 2, characterized in that: The worm wheel (42) is connected to the magnet (41), the worm wheel (42) is connected to the worm (43), the worm wheel (42) is located on the rotating shaft (44), and the rotating shaft (44) is connected to the bracket (46) through the bearings (45) on both sides.

4. The Hall effect length measuring sensor with a worm gear structure according to claim 1, characterized in that: The circuit board (5) includes a circuit board substrate (51) and a single-turn Hall chip (52).

5. The Hall effect length measuring sensor with a worm gear structure according to claim 4, characterized in that: The single-turn Hall chip (52) is disposed on the circuit board substrate (51).

6. The Hall effect length measuring sensor with a worm gear structure according to claim 5, characterized in that: The single-loop Hall chip (52) and the magnet (41) are placed parallel to each other at a certain distance.

7. The Hall effect length measuring sensor with a worm gear structure according to claim 1, characterized in that: The rope end assembly (8) is connected to the external test object, and the rope end assembly (8) is stretched or retracted with the external moving parts.

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