WO2021093078A1

WO2021093078A1 - Hall displacement sensor

Info

Publication number: WO2021093078A1
Application number: PCT/CN2019/125379
Authority: WO
Inventors: 尹华林; 谭书伟; 周园; 库舜; 褚世杰
Original assignee: 武汉光迅科技股份有限公司
Priority date: 2019-11-15
Filing date: 2019-12-13
Publication date: 2021-05-20
Also published as: CN110887511A; CN110887511B

Abstract

A Hall displacement sensor, comprising a first sliding block (10), a second sliding block (20), and an elastic member (70). The first sliding block (10) is slidably connected to the second sliding block (20). The first sliding block (10) and the second sliding block (20) have a gap therebetween in a sliding direction. The elastic member (70) is located in the gap. The elastic member (70) exerts an acting force in the sliding direction on the first sliding block (10) so that the first sliding block (10) abuts against the second sliding block (20). The Hall displacement sensor further comprises a magnetic member (40), a Hall chip (50), and a circuit board (60) electrically connected to the Hall chip (50). One of the magnetic member (40) and the Hall chip (50) is disposed on the first sliding block (10), and the other is disposed on the second sliding block (20). According to the Hall displacement sensor, the Hall chip (50) is disposed in a magnetic field generated by the magnetic element (40); in an automatic coupling process, a first coupling device is coupled to a second coupling device under the driving of a motor; the Hall chip (50) moves in the magnetic field, and the relationship between the displacement of the Hall chip (50) in the magnetic field and a sensing signal is established based on the Hall effect, thereby implementing displacement measurement.

Description

Hall displacement sensor

Cross-references to related applications

This application is filed based on a Chinese patent application with an application number of 201911118096.0 and an application date of November 15, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by reference.

Technical field

The embodiment of the present invention relates to the technical field of sensors, in particular to a Hall displacement sensor.

Background technique

With the development of modern instruments and equipment in the direction of intelligence, in small-distance measurement occasions, new requirements are put forward for the accuracy and speed of measurement. For example, in the automatic coupling process of collimator-type passive devices, the key point is to form a parallel narrow gap of 0-50 μm between the end faces of the two coupling devices for filling and curing the UV glue. In the above-mentioned procedures, processes such as displacement detection and elastic displacement are required to be realized. Therefore, there is an urgent need to develop a Hall displacement sensor that can realize the above-mentioned automatic coupling process and has a simple structure and easy operation.

Summary of the invention

The purpose of the embodiments of the present invention is to provide a Hall displacement sensor to solve the technical problem that the automatic coupling process of the collimator-type passive device in the prior art is difficult to realize.

In order to achieve the foregoing objective, the technical solution of the embodiment of the present invention is implemented as follows:

The embodiment of the present invention provides a Hall displacement sensor, which includes a first slider, a second slider, and an elastic member. The first slider is slidably connected to the second slider, and the first slider is connected to the The second slider has a gap in the sliding direction, the elastic member is located in the gap, and the elastic member applies a force in the sliding direction to the first slider to push the first slider against Connected to the second slider; the Hall displacement sensor further includes a magnetic component, a Hall chip, and a circuit board electrically connected to the Hall chip, one of the magnetic component and the Hall chip One is arranged on the first sliding block, and the other is arranged on the second sliding block.

Further, the magnetic member and the Hall chip are disposed opposite to each other and are respectively located on two sides of the gap.

Further, the magnetic member is a cylindrical permanent magnet, and the Hall chip moves in the axial direction of the magnetic member.

Further, the diameter of the cylindrical permanent magnet is 1 mm to 4 mm; and/or the size of the gap along the sliding direction is 1 mm to 2 mm.

Further, the Hall displacement sensor further includes a lock rod installed on the first slider or the second slider, and the lock rod is used to lock or unlock the first slider and the second slider. The relative position between the two sliders.

Further, the Hall displacement sensor further includes a sliding mechanism disposed between the first sliding block and the second sliding block, and the sliding mechanism includes a base and a sliding member that slide relatively to each other. The first slider is tightly connected, the base and the second slider are tightly connected, and the first slider abuts on the base.

Further, the first slider has a cavity, the sliding mechanism is located in the cavity, one end of the base abuts against the side wall of the cavity, and the magnetic member is installed in the cavity The second slider includes a bottom plate and a side plate connected to the bottom plate, the bottom plate is connected to the base, and the Hall chip is mounted on the side plate.

Further, the Hall displacement sensor further includes a lock rod for locking or unlocking the relative position between the first sliding block and the second sliding block, and the lock rod is installed on the side plate.

Further, the elastic member is a compression spring or a tension spring.

Further, the sensitivity of the Hall chip is higher than or equal to 3.125 mV/Gauss.

In the Hall displacement sensor provided by the embodiment of the present invention, the Hall chip is placed in the magnetic field generated by the magnetic element. In the automatic coupling process, the first slider is connected with the first coupling device, and the second slider is connected with the motor. Driven by the motor, the first coupling device is coupled with the second coupling device; in the above coupling process, the Hall chip moves in the magnetic field, and the displacement of the Hall chip in the magnetic field (that is, the first sliding device) is established based on the Hall effect. The relationship between the relative displacement between the block and the second sliding block) and the sensing signal, so as to realize the displacement measurement. The Hall displacement sensor of the embodiment of the present invention has a simple structure and is easy to operate.

Description of the drawings

FIG. 1 is an exploded view of the structure of a Hall displacement sensor provided by an embodiment of the present invention;

2 is a top view of a Hall displacement sensor provided by an embodiment of the present invention, in which the first slider is not shown;

Figure 3 is a cross-sectional view of the Hall displacement sensor shown in Figure 2 along A-A;

4 is a graph of the relationship between the sensing signal and the relative displacement between the first slider and the second slider in the Hall displacement sensor provided by an embodiment of the present invention.

Description of reference signs:

10. The first slider; 11. The cavity; 20, the second slider; 21, the bottom plate; 22, the side plate; 30, the sliding mechanism; 31, the base; 32, the sliding part; 40, the magnetic part; 50, the Huo Er chip; 60, circuit board; 70, elastic part; 80, cylinder; 81, piston rod.

Detailed ways

The embodiments of the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. The descriptions of "first" and "second" in the embodiments of the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present invention, "a plurality of" means at least two, such as two, three, etc., unless specifically defined otherwise.

1 to 3, an embodiment of the present application provides a Hall displacement sensor, including a first slider 10, a second slider 20, and an elastic member 70, the first slider 10 and the second slider 20 are slidably connected , The first slider 10 and the second slider 20 have a gap in the sliding direction, the elastic member 70 is located in the gap, and the elastic member 70 applies a force in the sliding direction to the first slider 10 to resist the first slider 10 Connected to the second slider 20. The Hall displacement sensor further includes a magnetic member 40, a Hall chip 50, and a circuit board 60 electrically connected to the Hall chip 50. One of the magnetic member 40 and the Hall chip 50 is disposed on the first slider 10, and the other One is arranged on the second sliding block 20.

Understandably, the first sliding block 10 and the second sliding block 20 are slidably connected. Sliding connection methods, such as the sliding connection method between the guide rail and the slider, the sliding connection method of the ball sliding group, and the similar sliding connection method between the sleeve and the sleeve, can all be suitable for this. An elastic member 70 is provided in the gap between the first slider 10 and the second slider 20, and the elastic member 70 makes the first slider 10 abut on the second slider 20. The force exerted by the elastic member 70 on the first slider 10 and the force between the first slider 10 and the second slider 20 can keep the first slider 10 and the second slider 20 in a stable equilibrium state. Further, the elastic member 70 is a compression spring or a tension spring. The number of the elastic member 70 is at least one. In the equilibrium state, the compression spring is in a compressed state and the tension spring is in a stretched state, and the first slider 10 and the second slider 20 have no relative movement.

In addition, one of the magnetic member 40 and the Hall chip 50 is disposed on the first slider 10, and the other is disposed on the second slider 20. At this time, the first slider 10 and the second slider 20 are The relative movement between the two can make the Hall chip 50 relatively move within the magnetic field generated by the magnetic member 40, even if the position of the Hall chip 50 in the magnetic field changes, so that the Hall chip 50 can sense the change of the magnetic field strength and produce a difference. The induction signal. The sensing signal can be transmitted to the controller through the circuit board 60, so as to establish the relationship between the sensing signal of the Hall chip 50 and the relative displacement of the first slider 10 and the second slider 20 to realize displacement measurement.

The Hall displacement sensor of the embodiment of the present application can be used in small-distance displacement measurement occasions. Taking the automatic coupling process of a collimator-type passive device as an example, the process is as follows:

Firstly, the first coupling device is elastically connected to the motor, that is, the first coupling device is fixed on the first sliding block 10 and the motor is fixed on the second sliding block 20. In the initial state, the first sliding block 10, the second sliding block 20 and the elastic member 70 are kept in a relatively stable state, that is, the first coupling device and the motor are kept relatively stationary. The motor drives the first coupling device to approach the second coupling device. During the approach, the first slider 10 and the second slider 20 have no relative movement until the end faces of the two coupling devices touch. 10 compresses the elastic member 70 and moves relative to the second slider 20. At this time, the relative position of the Hall chip 50 in the magnetic field changes, so it senses the change in the intensity of the magnetic field and generates an induction signal. The induction signal is transmitted to the controller through the circuit board 60. The controller determines that a touch has occurred and determines the first The relative displacement between the coupling device and the motor, that is, the relative displacement between the first slider 10 and the second slider 20, controls the motor to stop working, and at the same time obtains the displacement.

Then, the motor rotates according to the displacement obtained above to restore the elastic member 70 to the initial state, the two coupling devices are out of contact, the first slider 10, the second slider 20 and the elastic member 70 return to a balanced state, and the first slider The block 10 and the second slider 20 are also transformed into a relatively static state; then the controller controls the motor to drive the first slider 10, the second slider 20 and the first coupling device to continue to move 0-50μm, so that the first coupling device A required narrow gap is formed with the second coupling device. The ultraviolet glue is poured into the narrow gap and cured to complete the automatic coupling process.

In the Hall displacement sensor of the embodiment of the present application, the Hall chip 50 is placed in the magnetic field generated by the magnetic member 40. In the automatic coupling process, the first slider 10 is connected with the first coupling device, and the second slider 20 is connected with the motor. Connect, the first coupling device is coupled with the second coupling device under the drive of the motor; in the above coupling process, the Hall chip 50 moves in the magnetic field, and the displacement of the Hall chip 50 in the magnetic field is established based on the Hall effect (That is, the relative displacement between the first slider 10 and the second slider 20) and the relationship between the sensing signal, so as to realize the displacement measurement. The Hall displacement sensor in the embodiment of the present application has a simple structure and is easy to operate.

In some embodiments, the magnetic element 40 and the Hall chip 50 are disposed opposite to each other and are respectively located on two sides of the gap. It is understandable that the magnetic element 40 and the Hall chip 50 are arranged opposite to each other, so that the magnetic field in which the Hall chip 50 is located is closer to the gradient magnetic field, so that the relative displacement of the Hall chip 50 in the magnetic field and the electric potential of the induced signal are closer. Close to linear relationship, so that the displacement detection accuracy is higher.

In some embodiments, the magnetic member 40 is a cylindrical permanent magnet, and the Hall chip 50 moves in the axial direction of the magnetic member 40. A constant magnetic field with an approximate gradient distribution exists in the axial direction of the cylindrical permanent magnet. In the constant magnetic field with the gradient distribution, the axial displacement of the Hall chip 50 relative to the permanent magnet and the induction signal generated by the Hall chip 50 are approximately linear. Referring to Fig. 4, the displacement sensing accuracy can reach 10 μm. The accuracy of displacement measurement is high. The constant magnetic field of the cylindrical permanent magnet in the axial direction has an approximate gradient distribution only in a small range. Therefore, the Hall displacement sensor of the embodiment of the present application is suitable for small-range application scenarios.

The diameter of the cylindrical permanent magnet is different, and the constant magnetic field whose axial magnetic field intensity approximates a gradient distribution is also different. The distance between the gradient magnetic field and the end surface of the magnetic member 40 is also different, resulting in a difference in the accuracy of the Hall displacement sensor. Further, the diameter of the cylindrical permanent magnet is 1 mm to 4 mm. Choosing a cylindrical permanent magnet with the above diameter range can make the Hall displacement sensor more accurate. Further, the size of the gap along the sliding direction is 1 mm to 2 mm. When the distance between the Hall chip 50 and the end surface of the magnetic member 40 is 1 mm-2 mm, the displacement sensing accuracy is the highest. In order to detect the small displacement of the automatic coupling device in the collimator-type passive device after being touched and the narrow gap of 0-50μm formed between the last two coupling devices, a cylindrical permanent magnet with a diameter of 2mm is preferred, and the theory is passed. Deduction and experimental verification show that there is a constant magnetic field with an approximate gradient distribution at a distance of 1.5 mm from the end face of the magnet in the axial direction, where the displacement detection accuracy is the highest.

In some embodiments, the sensitivity of the Hall chip 50 is higher than or equal to 3.125 mV/Gauss. The high sensitivity of the Hall chip 50 makes the induced signal generated by it more accurate, which can further improve the accuracy of displacement measurement.

In some embodiments, the Hall displacement sensor further includes a lock rod installed on the first slider 10 or the second slider 20, and the lock rod is used to lock or unlock the space between the first slider 10 and the second slider 20. Relative position. The number of lock rods is at least one. In the initial state, one end of the lock rod is located in the gap between the first slider 10 and the second slider 20. When the lock rod is extended, its extended end can abut on the first slider 10 or the second slider 20, so that the first slider 10 and the second slider 20 cannot move relative to each other, and the relative movement of the two can be locked. position. When the lock rod is retracted, it does not abut the first slider 10 or the second slider 20, and the first slider 10 and the second slider 20 can resume relative movement, thereby unlocking the relative positions of the two. After the UV glue is applied between the first coupling device and the second coupling device, the UV glue will generate tension during the curing process. In order to prevent the gap between the two coupling devices from being changed by tension, before the UV glue is applied, The control lock rod pushes out and abuts the end surface of the first slider 10 or the second slider 20, so that the connection between the first slider 10 and the second slider 20 becomes a rigid fixed connection. After the UV glue is cured, the lock lever is controlled to retract to complete the automatic coupling process.

Understandably, the aforementioned lock rod may be the piston rod 81 of the cylinder 80. The installation position of the air cylinder 80 is not required, and it can be installed on the first sliding block 10 or the second sliding block 20 alternatively. When the relative position of the first slider 10 and the second slider 20 needs to be locked, the piston rod 81 of the air cylinder 80 is pushed out, so that the first slider 10 and the second slider 20 are in a relatively static state; when the first slider needs to be unlocked When the sliding block 10 and the second sliding block 20 are in relative positions, the piston rod 81 of the air cylinder 80 is retracted, so that the first sliding block 10 and the second sliding block 20 can be restored to a relatively movable state.

In some embodiments, the Hall displacement sensor further includes a sliding mechanism 30 disposed between the first sliding block 10 and the second sliding block 20. The sliding mechanism 30 includes a base 31 and a sliding member 32 that slide relative to each other. The sliding member 32 and The first slider 10 is tightly connected, the base 31 and the second slider 20 are tightly connected, and the first slider 10 abuts on the base 31. There are many sliding modes, and the sliding connection mode of the ball sliding group is used in the embodiment of the present application. The number of the base 31 and the sliding member 32 is at least one respectively, and they can cooperate with each other. The sliding member 32 can slide along a straight line on the base 31, so that the first sliding block 10 and the second sliding block 20 can move relatively. The first sliding block 10 abuts on the base 31 fastened to the second sliding block 20. The above-mentioned sliding connection makes the relative movement between the first slider 10 and the second slider 20 more stable and reliable. Wherein, the sliding member 32 can be designed as a structure with grooves, and the grooves of the sliding member 32 are covered on both sides of the base 31 so that it will not derail when sliding with the base 31, which is more reliable.

Further, the first slider 10 has a cavity 11, the sliding mechanism 30 is located in the cavity 11, one end of the base 31 abuts against the side wall of the cavity 11, and the magnetic member 40 is installed on the side wall of the cavity 11. When the effects of the elastic member 70 and the base 31 on the first sliding block 10 and the second sliding block 20 are balanced, the first sliding block 10 and the second sliding block 20 do not move relative to each other. The sliding mechanism 30 is arranged in the cavity 11 of the first sliding block 10, which saves space and makes the structure of the Hall displacement sensor more compact. The second slider 20 includes a bottom plate 21 and a side plate 22 connected to the bottom plate 21, the bottom plate 21 is connected to the base 31, and the Hall chip 50 is mounted on the side plate 22. The second sliding block 20 is L-shaped, and the bottom plate 21 and the side plate 22 are vertically connected. The bottom plate 21 is connected to the base 31, so that the second slider 20 and the first slider 10 can move relatively when the base 31 and the slider 32 slide relatively. A Hall chip 50 is mounted on the side plate 22 and is located in the magnetic field generated by the magnetic member 40 on the first slider 10. The circuit board 60 and the Hall chip 50 are both mounted on the side plate 22 of the second slider 20, and the structure is simple. The circuit board 60 is electrically connected with an external socket, and the external socket can be electrically connected with an external transmission line to continuously transmit the induction signal generated by the Hall chip 50 to the controller.

Furthermore, the Hall displacement sensor further includes a lock rod for locking or unlocking the relative position between the first sliding block 10 and the second sliding block 20, and the lock rod is installed on the side plate 22. It is understandable that the lock rod is installed on the side plate 22 of the second sliding block 20, which is convenient for installation and can simplify the overall structure of the sensor, making the structure simpler and more compact.

The above are only specific implementations of the embodiments of the present invention, but the scope of protection of the embodiments of the present invention is not limited thereto. Any person skilled in the art can easily think of it within the technical scope disclosed in the embodiments of the present invention. Changes or replacements should be covered within the protection scope of the embodiments of the present invention. In addition, the technical solutions between the various implementations of the embodiments of the present invention can be combined with each other, but must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, this technical solution should be considered The combination of does not exist, nor does it fall within the scope of protection required by the embodiments of the present invention. Therefore, the protection scope of the embodiments of the present invention should be subject to the protection scope of the claims.

Claims

A Hall displacement sensor, comprising a first sliding block, a second sliding block and an elastic member, the first sliding block is slidably connected to the second sliding block, the first sliding block and the second sliding block There is a gap in the sliding direction, the elastic member is located in the gap, and the elastic member applies a force along the sliding direction to the first slider to abut the first slider against the second slider. On the slider

The Hall displacement sensor further includes a magnetic component, a Hall chip, and a circuit board electrically connected to the Hall chip, and one of the magnetic component and the Hall chip is disposed on the first slider , And the other one is arranged on the second slider.
The Hall displacement sensor according to claim 1, wherein the magnetic member and the Hall chip are disposed opposite to each other and are respectively located on two sides of the gap.
3. The Hall displacement sensor according to claim 2, wherein the magnetic member is a cylindrical permanent magnet, and the Hall chip moves in the axial direction of the magnetic member.
The Hall displacement sensor according to claim 3, wherein the diameter of the cylindrical permanent magnet is 1 mm to 4 mm; and/or the size of the gap along the sliding direction is 1 mm to 2 mm.
The Hall displacement sensor according to any one of claims 1 to 4, the Hall displacement sensor further comprising a lock rod installed on the first sliding block or the second sliding block, and the lock rod is used for To lock or unlock the relative position between the first slider and the second slider.
The Hall displacement sensor according to any one of claims 1 to 4, the Hall displacement sensor further comprising a sliding mechanism provided between the first sliding block and the second sliding block, the sliding mechanism It includes a relatively sliding base and a sliding member, the sliding member is tightly connected with the first sliding block, the base is tightly connected with the second sliding block, and the first sliding block abuts against the base on.
The Hall displacement sensor according to claim 6, wherein the first slider has a cavity, the sliding mechanism is located in the cavity, and one end of the base abuts against the side wall of the cavity, so The magnetic member is mounted on the side wall of the cavity; the second slider includes a bottom plate and a side plate connected to the bottom plate, the bottom plate is connected to the base, and the Hall chip is mounted on the On the side panel.
The Hall displacement sensor according to claim 7, further comprising a lock rod for locking or unlocking the relative position between the first sliding block and the second sliding block, the lock The rod is installed on the side plate.
The Hall displacement sensor according to any one of claims 1 to 4, wherein the elastic member is a compression spring or a tension spring.
The Hall displacement sensor according to any one of claims 1 to 4, wherein the sensitivity of the Hall chip is higher than or equal to 3.125 mV/Gauss.