CN219046139U

CN219046139U - Magneto-resistive proximity sensor

Info

Publication number: CN219046139U
Application number: CN202223453232.1U
Authority: CN
Inventors: 杜玉良; 严子光
Original assignee: Shenzhen Sunwave Electronics Co ltd
Current assignee: Shenzhen Sunwave Electronics Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-19
Anticipated expiration: 2032-12-21

Abstract

The application relates to a magnetic resistance proximity sensor, which comprises a sensor shell, a magnetic shielding sleeve, a magnetic induction assembly, a contact sleeve, a magnet and a connecting wire, wherein a through hole is formed in the sensor shell in a penetrating manner; the magnetic shielding sleeve is fixed on the side wall where the through hole is located, one end of the magnetic shielding sleeve is provided with a detection hole, a gap is formed between the magnetic shielding sleeve and the side wall where the through hole is located, and the magnetic shielding sleeve is made of a magnetic conductive material; the magnetic induction component is arranged in the magnetic shielding sleeve; the contact sleeve is sleeved on the magnetic shielding sleeve and is respectively connected with the magnetic shielding sleeve and the side wall of the through hole in a sliding manner; the magnet is arranged on the bottom wall of the contact sleeve, and the magnet and the detection hole are oppositely arranged; the connecting wire is connected with the magnetic induction component, and the connecting wire is fixedly connected with the magnetic shielding sleeve. The application utilizes the magnetic shielding sleeve to isolate external magnetic fields, reduces external interference magnetic fields and passes through the magnetic shielding sleeve to reach the magnetic induction assembly, thereby achieving the effect of shielding external interference magnetic fields.

Description

Magneto-resistive proximity sensor

Technical Field

The application relates to the technical field of sensors, in particular to a magneto-resistive proximity sensor.

Background

The proximity sensor is an electronic device, and is capable of detecting the position of a detected object without making mechanical contact with a moving member, converting the position amount of the detected object into an on-off electrical signal, and outputting the on-off electrical signal to a control processing device to complete signal control or signal conversion. And a magneto-resistive proximity sensor detects the position and direction of a magnetic material using the magneto-resistive effect of a semiconductor material. The magnetic resistance proximity sensor has the effects of low power consumption, high sensitivity and high stability, and the volume can be smaller.

The magnetoresistive proximity sensor detects a change in a magnetic field of a detected element to determine a position of the detected element. When the magnetic field in the use environment changes, the effect element inside the magnetic resistance proximity sensor is easy to mistakenly identify the magnetic field change as being caused by the position change of the detected element, so that the accuracy of output data can be affected, and false alarm can be caused when the magnetic field change is serious.

In the related art, the magnetic field in the use environment easily affects the magnetoresistive proximity sensor, and the magnetoresistive proximity sensor is easily triggered by a false signal to be output, so that the defect of low detection precision exists.

Disclosure of Invention

In order to reduce the image of the magnetoresistive proximity sensor by the magnetic field in the use environment, the present application provides a magnetoresistive proximity sensor.

The application provides a magnetic resistance proximity sensor adopts following technical scheme:

a magnetoresistive proximity sensor, comprising:

the sensor shell is internally provided with a through hole in a penetrating way; the magnetic shielding sleeve is fixed on the side wall where the through hole is located, one end of the magnetic shielding sleeve is provided with a detection hole, a gap is formed between the magnetic shielding sleeve and the side wall where the through hole is located, and the magnetic shielding sleeve is made of a magnetic conductive material; the magnetic induction component is arranged in the magnetic shielding sleeve; the contact sleeve is sleeved on the magnetic shielding sleeve and is respectively connected with the magnetic shielding sleeve and the side wall of the through hole in a sliding manner; the magnet is arranged on the bottom wall of the contact sleeve, and the magnet and the detection hole are oppositely arranged; the connecting wire is connected with the magnetic induction component, and the connecting wire is fixedly connected with the magnetic shielding sleeve.

Through adopting above-mentioned technical scheme, install magnetism subassembly in magnetism shielding sleeve, utilize magnetism shielding sleeve to keep apart external magnetic field. When the external interference magnetic field is transmitted to the magnetic shielding sleeve, the interference magnetic field forms a loop along the outer side of the magnetic shielding sleeve, and the interference magnetic field passes through the magnetic shielding sleeve to reach the magnetic induction assembly, so that the effect of shielding the external interference magnetic field is achieved. And when the magnetic shielding sleeve is normally used, the magnet is driven to move through the sliding of the contact sleeve, the detection hole is formed in the magnetic shielding sleeve, and the detection hole and the magnet are arranged oppositely, so that the magnetic field of the magnet is conveniently transmitted to the magnetic induction assembly through the detection hole, and the detection of the movement distance is completed through the detection of the magnetic field.

Optionally, a mounting seat is arranged in the magnetic shielding sleeve in an abutting manner, and the magnetic induction component is fixed on the mounting seat; the mounting seat is provided with a mounting part, and the mounting part is abutted with the side wall of the detection hole.

Through adopting above-mentioned technical scheme, utilize the mount pad to fix the magnetic subassembly, can play better fixed action to the magnetic subassembly. And through setting up the installation department on the mount pad, utilize the installation department to fill the detection hole to reach the telescopic effect of closed magnetic shielding, reduce greasy dirt, the dust in the external world and enter into in the magnetic shielding sleeve and cause the influence to the magnetism subassembly.

Optionally, the magnetic induction component comprises a magnetic induction element and a circuit board, and the magnetic induction element is fixed on the circuit board; the mounting seat is provided with a groove, and the circuit board is clamped and arranged in the groove.

Through adopting above-mentioned technical scheme, set up the recess on the mount pad, circuit board and mount pad in the magnetic induction subassembly of being convenient for carry out the joint fixedly.

Optionally, one end of the magnetic shielding sleeve, which is far away from the detection hole, is provided with a connecting part, and the connecting part is in threaded connection with the side wall where the through hole is located.

Through adopting above-mentioned technical scheme, utilize connecting portion to come to carry out screw thread installation with the sensor housing fixedly, be convenient for install magnetic shielding sleeve.

Optionally, the connecting part is provided with an abutting groove, and one end of the contact sleeve, which is far away from the magnet, is provided with an abutting plate; the magnetic shielding sleeve is sleeved with a spring, and two ends of the spring are respectively abutted on the bottom of the abutting groove and the abutting plate.

Through adopting above-mentioned technical scheme, set up the spring on magnetic shielding sleeve, come connecting portion and the contact sleeve on the magnetic shielding sleeve of butt respectively through the spring, when the contact sleeve is pressed and towards connecting portion motion, can carry out the position to the contact sleeve when ambient pressure disappears through the spring and reset.

Optionally, a limiting ring is arranged on the side wall of the through hole, the limiting ring is arranged at an opening of one side of the through hole away from the connecting part, and the abutting plate is arranged between the limiting ring and the connecting part.

Through adopting above-mentioned technical scheme, utilize the spacing ring that forms on the lateral wall of through-hole to carry out the position spacing to the butt board to avoid the contact sleeve to follow the through-hole landing in the process of resetting.

Optionally, the connecting portion is provided with a plurality of mounting holes on keeping away from the side of detection hole, and the mounting hole is used for holding the instrument and drives magnetism shielding sleeve and rotate.

Through adopting above-mentioned technical scheme, when installing magnetic shielding sleeve, utilize the mounting hole to hold the instrument to drive magnetic shielding sleeve and rotate, finally with sensor housing threaded connection fixed.

Optionally, the one end joint that the detection hole was kept away from to the magnetic shielding sleeve is provided with the closing plate, and the connecting wire wears to establish in the closing plate.

Through adopting above-mentioned technical scheme, set up the closing plate through the joint, the dismantlement of closing plate and the installation of magnetic induction subassembly of being convenient for.

Optionally, an indicator light is arranged on the sealing plate and is electrically connected with the magnetic induction component.

By adopting the technical scheme, the different states of detection are indicated by the indicator lamp, so that the triggering result of detection can be obtained in time.

Optionally, a connection joint is arranged on the connection line.

Through adopting above-mentioned technical scheme, set up the connector on the connecting wire, make things convenient for whole magnetic resistance proximity sensor and outside to use equipment to carry out quick connect.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the magnetic shielding sleeve is used for isolating an external magnetic field, when the external magnetic field is transmitted to the magnetic shielding sleeve, the magnetic field forms a loop along the outer side of the magnetic shielding sleeve, and the magnetic field passes through the magnetic shielding sleeve to reach the magnetic induction assembly, so that the effect of shielding the external magnetic field is achieved.

2. The contact sleeve after being pressed can be reset rapidly through the spring, so that the detection state of the sensor can be recovered in time.

3. Can play sealed effect to the magnetic shielding sleeve, reduce greasy dirt, the dust in the external world and enter into in the magnetic shielding sleeve and cause the influence to the magnetism subassembly.

Drawings

FIG. 1 is an overall block diagram of a magnetoresistive proximity sensor according to an embodiment of the present application.

FIG. 2 is a schematic cross-sectional view of a magnetoresistive proximity sensor prior to detection in accordance with an embodiment of the present application.

FIG. 3 is a schematic cross-sectional view of a magnetoresistive proximity sensor according to an embodiment of the present application during detection.

Reference numerals illustrate: 1. a sensor housing; 11. a through hole; 12. a limiting ring; 2. a magnetic shielding sleeve; 21. a detection hole; 22. a mounting base; 221. a mounting part; 23. a connection part; 231. an abutment groove; 232. a mounting hole; 24. a sealing plate; 241. an indicator light; 3. a magnetic induction component; 31. a magnetic induction element; 32. a circuit board; 4. a contact sleeve; 41. an abutting plate; 5. a magnet; 6. a connecting wire; 61. a connection joint; 7. a spring; .

Detailed Description

The present application is described in further detail below in conjunction with figures 1-3.

The embodiment of the application discloses a magnetic resistance proximity sensor. Referring to fig. 1 and 2, the magnetoresistive proximity sensor includes a sensor housing 1, a magnetic shield sleeve 2, a magnetic sensing assembly 3, a contact sleeve 4, a magnet 5, and a connection wire 6. A through hole 11 is provided in the sensor housing 1, and the magnetic shield sleeve 2, the magnetic induction assembly 3 and the contact sleeve 4 are all disposed in the through hole 11. The magnetic induction assembly 3 is also arranged in the magnetic shielding sleeve 2, the magnetic shielding sleeve 2 shields the external interference magnetic field, and the magnet 5 is arranged in the contact sleeve 4. The magnetic shielding sleeve 2 is fixedly connected with the sensor housing 1, and the contact sleeve 4 is slidably connected with the sensor housing 1, so that when the contact sleeve 4 is pushed to generate position movement, a corresponding electric signal is generated by the magnetic induction component 3. The connection wire 6 is connected to the magnetically sensitive assembly 3 so as to transmit the electrical signal.

Wherein, the lateral wall fixed connection of magnetism shielding sleeve 2 and through-hole 11, there is the clearance between the week side of magnetism shielding sleeve 2 and the lateral wall of through-hole 11, and contact sleeve 4 cover is established on magnetism shielding sleeve 2, and contact sleeve 4 is located this clearance. The contact sleeve 4 is slidably connected to the side wall of the through hole 11 and the contact sleeve 4 along the axial direction of the through hole 11, respectively.

Specifically, threads are provided on the side wall of the through hole 11 near one end of the through hole 11, and an opening is provided on one end of the magnetic shield sleeve 2, a connecting portion 23 is provided on the end where the opening is located, and threads matching with the inner side wall of the through hole 11 are provided on the connecting portion 23. While the magnetic shield sleeve 2 is fixed by the connection portion 23, the distance between the peripheral side of the magnetic shield sleeve 2 and the side wall of the through hole 11 is increased by the connection portion 23 so that the contact sleeve 4 can slide in the gap between the peripheral side of the magnetic shield sleeve 2 and the side wall of the through hole 11.

At the end of the magnetic shield sleeve 2 remote from the opening, a detection hole 21 is provided, the detection hole 21 being located on the axis of the through hole 11. In this embodiment, the magnetic shield sleeve 2 is made of a material having a good magnetic conduction effect, for example: SUS630 or 17-4PH (both martensitic precipitation hardening stainless steel). When the magnetic induction component 3 is placed in the magnetic shielding sleeve 2, the magnetic induction component 3 is protected by the magnetic shielding sleeve 2, and an external interference magnetic field is transmitted to the magnetic shielding sleeve 2 to form a ring shape to return, so that the influence on the magnetic induction component 3 is reduced. The detection hole 21 is for facilitating the magnetic field along the axial direction of the through hole 11 to be detected and received by the magnetic induction component 3.

In the present embodiment, a plurality of mounting holes 232 are provided in the connection portion 23, and the mounting holes 232 are located on one end surface of the connection portion 23 away from the detection hole 21. When the magnetic shielding sleeve 2 is installed, a tool is placed through the installation hole 232, and the magnetic shielding sleeve 2 is driven to rotate through the tool, so that the installation of the magnetic shielding sleeve 2 is facilitated.

In the present embodiment, a sealing plate 24 is also provided on the magnetic shield sleeve 2. The sealing plate 24 is disposed on a side of the opening of the magnetic shield sleeve 2, and the sealing plate 24 and the magnetic shield sleeve 2 are fastened and fixed. The connecting wire 6 is penetrated and fixed on the sealing plate 24, and the connecting wire 6 is fixedly connected with the magnetic induction assembly 3. The clamping and fixing of the sealing plate 24 and the magnetic shielding sleeve 2 ensure that the space inside the magnetic shielding sleeve 2 is in a closed state, and the detection accuracy of the magnetic induction assembly 3 is ensured.

An indicator lamp 241 is further arranged on the sealing plate 24, and the indicator lamp 241 is electrically connected with the magnetic induction component 3. When the magnetic induction assembly 3 detects a magnetic field signal, a light signal is emitted through the indication lamp 241, and when the magnetic induction assembly 3 does not detect a magnetic field signal, the indication lamp 241 does not have a light output.

A mounting seat 22 is also arranged in the magnetic shielding sleeve 2, the mounting seat 22 is abutted against the inner wall of the magnetic shielding sleeve 2, and the magnetic induction assembly 3 is fixed on the mounting seat 22. Specifically, the mounting seat 22 is provided with a circular mounting portion 221, the diameter of the mounting portion 221 is the same as that of the detection hole 21, when the mounting seat 22 is placed in the magnetic shielding sleeve 2, the mounting portion 221 is located in the detection hole 21, and the fixing effect of the mounting seat 22 and the magnetic shielding sleeve 2 is further increased. The mount 22 is cylindrical, and a groove is provided on the inner wall of the mount 22.

The magnetic induction assembly 3 includes a circuit board 32 and a magnetic induction element 31, the magnetic induction element 31 is provided on the circuit board 32, and the connection wire 6 and the circuit board 32 are fixed by soldering. The circuit board 32 is clamped in the groove, and the position of the magnetic induction element 31 is fixed by the groove on the mounting part 221. In the present embodiment, the connection wire 6 and the circuit board 32 are solder-fixed, and a connection joint 61 is further provided at the other end of the connection wire 6. The use of the sensor is facilitated by the quick connection of the lines by the connection tabs 61.

After the contact sleeve 4 is fitted over the magnetic shield sleeve 2, a magnet 5 is also provided on the bottom wall of the contact sleeve 4, and the magnet 5 is also located on the axis of the through hole 11, so that the positions of the magnet 5 and the detection hole 21 are opposed. When the contact sleeve 4 slides due to an external force, the position of the magnet 5 is also changed, and the magnetic field of the magnet 5 can be transmitted to the magnetically sensitive element 31 through the detection hole 21, and a corresponding electric signal can be output from the magnetically sensitive element 31.

Referring to fig. 2 and 3, in the present embodiment, an abutment groove 231 is provided on the connection portion 23, the abutment groove 231 being located between the peripheral side of the magnetic shield sleeve 2 and the side wall of the through hole 11. And an abutting plate 41 is provided on the end of the contact sleeve 4 remote from the magnet 5, the abutting plate 41 being located between the circumferential side of the magnetic shield sleeve 2 and the side wall of the through hole 11. A spring 7 is provided between the abutment plate 41 and the abutment groove 231, and both ends of the spring 7 are respectively abutted against the abutment plate 41 and the abutment groove 231. When the contact sleeve 4 is pressed, the contact sleeve 4 slides, and the spring 7 is compressed, and when the applied external force disappears, the contact sleeve 4 is returned under the action of the spring 7.

In this embodiment, in order to reduce the deviation of the return of the contact sleeve 4, a stop ring 12 is also provided on the side wall of the through hole 11. While the stop collar 12 is located at the end of the through hole 11 remote from the thread and the abutment plate 41 on the contact sleeve 4 is located between the stop collar 12 and the connection portion 23. The abutment plate 41 is therefore position-limited by the stop collar 12, preventing the contact sleeve 4 from falling off.

The implementation principle of the magnetoresistive proximity sensor in the embodiment of the application is as follows: the magnetic shield sleeve 2 is used to isolate the external magnetic field. When the external interference magnetic field is transmitted to the magnetic shielding sleeve 2, the interference magnetic field forms a loop along the outer side of the magnetic shielding sleeve 2, and the interference magnetic field is reduced to pass through the magnetic shielding sleeve 2 and reach the magnetic induction assembly 3, so that the effect of shielding the external interference magnetic field is achieved. And in normal use, the magnet 5 is driven to move through the sliding of the contact sleeve 4, the detection hole 21 is formed in the magnetic shielding sleeve 2, and the detection hole 21 and the magnet 5 are arranged oppositely, so that the magnetic field of the magnet 5 is conveniently transmitted to the magnetic induction component 3 through the detection hole 21, and the detection of the movement distance is completed through the detection of the magnetic field.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. A magnetoresistive proximity sensor, comprising:

a sensor housing (1), wherein a through hole (11) is arranged in the sensor housing (1) in a penetrating way;

the magnetic shielding sleeve (2), the magnetic shielding sleeve (2) is fixed on the side wall where the through hole (11) is located, one end of the magnetic shielding sleeve (2) is provided with a detection hole (21), a gap is formed between the magnetic shielding sleeve (2) and the side wall where the through hole (11) is located, and the magnetic shielding sleeve (2) is made of magnetic conductive materials;

a magnetic induction component (3), wherein the magnetic induction component (3) is arranged in the magnetic shielding sleeve (2);

the contact sleeve (4) is sleeved on the magnetic shielding sleeve (2), and the contact sleeve (4) is respectively connected with the magnetic shielding sleeve (2) and the side wall where the through hole (11) is located in a sliding mode;

a magnet (5), wherein the magnet (5) is arranged on the bottom wall of the contact sleeve (4), and the magnet (5) and the detection hole (21) are oppositely arranged;

the connecting wire (6), connecting wire (6) with magnetism is felt subassembly (3) and is connected, connecting wire (6) with magnetism shielding sleeve (2) fixed connection.

2. The magnetoresistive proximity sensor of claim 1, wherein: a mounting seat (22) is arranged in the magnetic shielding sleeve (2) in an abutting mode, and the magnetic induction assembly (3) is fixed on the mounting seat (22); the mounting seat (22) is provided with a mounting part (221), and the mounting part (221) is abutted with the side wall of the detection hole (21).

3. The magnetoresistive proximity sensor of claim 2, wherein: the magnetic induction component (3) comprises a magnetic induction element (31) and a circuit board (32), wherein the magnetic induction element (31) is fixed on the circuit board (32); the mounting seat (22) is provided with a groove, and the circuit board (32) is clamped in the groove.

4. The magnetoresistive proximity sensor of claim 1, wherein: one end of the magnetic shielding sleeve (2) far away from the detection hole (21) is provided with a connecting part (23), and the connecting part (23) is in threaded connection with the side wall where the through hole (11) is located.

5. The magnetoresistive proximity sensor of claim 4, wherein: an abutting groove (231) is formed in the connecting portion (23), and an abutting plate (41) is arranged at one end, far away from the magnet (5), of the contact sleeve (4); the magnetic shielding sleeve (2) is sleeved with a spring (7), and two ends of the spring (7) are respectively abutted to the bottom of the abutting groove (231) and the abutting plate (41).

6. The magnetoresistive proximity sensor of claim 5, wherein: be provided with spacing ring (12) on the lateral wall of through-hole (11), spacing ring (12) set up through-hole (11) are kept away from one side opening part of connecting portion (23), butt board (41) set up spacing ring (12) with between connecting portion (23).

7. The magnetoresistive proximity sensor of claim 4, wherein: the side surface of the connecting part (23) far away from the detection hole (21) is provided with a plurality of mounting holes (232), and the mounting holes (232) are used for accommodating tools to drive the magnetic shielding sleeve (2) to rotate.

8. The magnetoresistive proximity sensor of claim 1, wherein: the magnetic shielding sleeve (2) is far away from one end of the detection hole (21) and is provided with a sealing plate (24) in a clamping manner, and the connecting wire (6) is arranged in the sealing plate (24) in a penetrating manner.

9. The magnetoresistive proximity sensor of claim 8, wherein: an indicator lamp (241) is arranged on the sealing plate (24), and the indicator lamp (241) is electrically connected with the magnetic induction component (3).

10. The magnetoresistive proximity sensor of claim 1, wherein: the connecting wire (6) is provided with a connecting joint (61).