Shell assembly of magnetic rotary encoder

Abstract

The utility model discloses a shell assembly of a magnetic rotary encoder, which relates to the technical field of magnetic rotary encoders and comprises a sensor shell, a positioning ring is arranged at the axis of the top of the sensor shell, a fixing seat is movably mounted at the positioning ring, and a magnet is mounted at the axis of one end, close to the sensor shell, of the fixing seat in a matched manner. According to the design scheme of the utility model, through the design that the positioning ring is arranged at the axis of the top of the sensor shell, the positioning ring is inserted into the bottom of the fixed seat, and the fixed seat is radially limited through the positioning ring, so that the coaxiality between the sensor shell and the fixed seat is less than 0.3 mm, the coaxiality of the magnetic encoder sensor and the magnet is prevented from being out of tolerance, and the reliability of the magnetic encoder is improved. In addition, dust in the external environment is prevented from entering a gap between the magnetic encoder sensor and the magnet through the fixing seat, and the magnetic rotary encoder is favorable for improving the detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic rotary encoders, in particular to a housing assembly of a magnetic rotary encoder. Background Art

[0002] A magnetic rotary encoder uses a magnet and a corresponding magnetic encoder sensor to determine the position, angle and speed of an object based on the magnetoresistive effect principle. The main advantage of a magnetic rotary encoder is the use of a non-contact induction system without using mechanical gears, which makes the magnetic rotary encoder have almost no wear and tear and requires no maintenance, ensuring a long service life even under the most adverse conditions.

[0003] For the existing magnetic rotary encoder, the coaxiality of the magnet and the magnetic encoder sensor cannot be greater than 0.3 mm, which results in a high installation accuracy requirement for the magnetic rotary encoder, making it inconvenient to install. Moreover, dust is likely to enter the gap between the magnet and the magnetic encoder sensor, affecting the detection accuracy. Summary of the Utility Model

[0004] In order to overcome the above-mentioned defects existing in the prior art, the utility model provides a housing assembly of a magnetic rotary encoder.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a housing assembly of a magnetic rotary encoder, including a sensor housing. A positioning ring is provided at the top center of the sensor housing, and a fixing seat is movably installed at the positioning ring. A magnet is cooperatively installed at the center of one end of the fixing seat close to the sensor housing.

[0006] Further, an installation cavity is provided at the bottom of the sensor housing. A wire outlet hole is opened on the side wall of the installation cavity. Two groups of side ears are provided on the bottom side wall of the sensor housing, and a connecting portion is provided on the side ears.

[0007] Further, a connecting groove matching with the positioning ring is opened at one end of the fixing seat close to the sensor housing.

[0008] Further, several groups of strip-shaped protrusions are provided on the outer side wall of the positioning ring, and the strip-shaped protrusions are longitudinally arranged on the positioning ring.

[0009] Further, an installation groove is opened at the center of one end of the fixing seat close to the sensor housing, the magnet is cooperatively installed in the installation groove, and several groups of bosses are provided on the side wall of the installation groove.

[0010] Further, a fixing groove is opened at the center of the end of the fixing seat away from the sensor housing, and several groups of ribs are provided on the side wall of the fixing groove.

[0011] Further, the fixing groove and the installation groove are connected to each other through a through hole.

[0012] The beneficial effects of the present utility model are as follows. Through the design that a positioning ring is provided at the top center of the sensor housing, the positioning ring is inserted into the bottom of the fixing base, and the fixing base is limited by the positioning ring, so that the coaxiality between the sensor housing and the fixing base is less than 0.3 mm, thereby avoiding the out-of-tolerance of the coaxiality between the magnetic encoder sensor and the magnet. Furthermore, the magnetic rotary encoder is easy to install, and the fixing base prevents dust in the external environment from entering the gap between the magnetic encoder sensor and the magnet, which is beneficial to improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0015] Figure 2 is a front view of the present utility model;

[0016] Figure 3 is an internal structural schematic diagram of the present utility model in the main viewing direction;

[0017] Figure 4 is a structural schematic diagram of the fixing base of the present utility model;

[0018] Figure 5 is a structural schematic diagram of the sensor housing of the present utility model.

[0019] In the figure: 1. Sensor housing, 11. Positioning ring, 12. Installation cavity, 13. Wire outlet hole, 14. Side ear, 15. Internal thread sleeve, 16. Strip-shaped protrusion, 2. Fixing base, 21. Connection groove, 22. Installation groove, 23. Boss, 24. Fixing groove, 25. Rib, 26. Through hole, 3. Magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to more clearly illustrate the technical solution of the present utility model, the present utility model will be further described below in conjunction with the drawings. Obviously, the following described drawings are only one embodiment of the present utility model. For those of ordinary skill in the art, without creative efforts, other embodiments obtained based on this drawing and embodiment all fall within the protection scope of the present utility model.

[0021] According to Figures 1-5 as shown, a housing assembly of a magnetic rotary encoder includes a sensor housing 1. A positioning ring 11 is provided at the top center of the sensor housing 1. A fixing base 2 is movably installed at the positioning ring 11. A magnet 3 is cooperatively installed at the center of one end of the fixing base 2 close to the sensor housing 1.

[0022] In this embodiment, an installation cavity 12 is provided at the bottom of the sensor housing 1. A magnetic encoder sensor is installed in the installation cavity 12. A wire outlet hole 13 is formed in the side wall of the installation cavity 12. The power supply and signal output holes of the magnetic encoder sensor are led outwards from the wire outlet hole 13. Two groups of side ears 14 are provided on the bottom end side wall of the sensor housing 1. A connecting portion 15 is provided on the side ear 14. The connecting portion 15 is an internal thread sleeve or a threaded hole. The sensor housing 1 is fixedly installed on the installation plate of the equipment frame through screws.

[0023] In this embodiment, a connecting groove 21 matching the positioning ring 11 is formed at one end of the fixing seat 2 close to the sensor housing 1. The installation gap between the connecting groove 21 and the positioning ring 11 is 0.1 - 0.2 mm. With the cooperation of the positioning ring 11 and the connecting groove 21, the coaxiality of the sensor housing 1 and the fixing seat 2 is less than 0.3 mm.

[0024] In this embodiment, several groups of strip-shaped protrusions 16 are provided on the outer side wall of the positioning ring 11. The strip-shaped protrusions 16 are longitudinally arranged on the positioning ring 11 to meet a relatively large tolerance range.

[0025] In this embodiment, an installation groove 22 is formed at the center of one end of the fixing seat 2 close to the sensor housing 1. The magnet 3 is fitted and installed in the installation groove 22. Several groups of convex platforms 23 are provided on the side wall of the installation groove 22. The convex platforms 23 prevent the magnet 3 from falling out of the installation groove 22.

[0026] In this embodiment, a fixing groove 24 is formed at the center of one end of the fixing seat 2 away from the sensor housing 1. Several groups of ribs 25 are provided on the side wall of the fixing groove 24. The fixing groove 24 is inserted into the convex platform of the rotating shaft. There is an interference fit between the convex platform of the rotating shaft and the fixing seat 2. When the rotating shaft rotates, it can drive the fixing seat 2 to rotate synchronously. The ribs 25 are for meeting a relatively large tolerance range.

[0027] In this embodiment, the fixing groove 24 and the installation groove 22 are connected to each other through a through hole 26. When disassembling the magnet 3, a round bar is used to pass through the through hole 26, so that the magnet 3 can be ejected from the installation groove 22.

[0028] When the utility model is in use, both the sensor housing 1 and the fixed seat 2 are made of plastic materials. The magnet 3 is installed in the installation groove 22, and the magnetic encoder sensor is installed in the installation cavity 12. When installing the magnetic rotary encoder, first fix the fixed seat 2 to the boss of the rotating shaft through the fixing groove 24, then insert the sensor housing 1 onto the fixed seat 2 through the positioning ring 11. Then, fix the mounting plate on the equipment rack. At this time, there is a slight gap between the bottom end of the sensor housing 1 and the mounting plate on the equipment rack, and the gap requirement is less than 1 mm. Then, pull the sensor housing 1 downward to contact the mounting plate, align the internal thread sleeve 15 with the positioning hole on the mounting plate, and fix the sensor housing 1 with screws, thus completing the overall installation of the magnetic rotary encoder. Under the cooperation of the positioning ring 11 and the connection groove 21, the coaxiality between the sensor housing 1 and the fixed seat 2 is less than 0.3 mm, thereby avoiding the out-of-tolerance of the coaxiality between the magnetic encoder sensor and the magnet 3. In addition, the positioning ring 11 and the connection groove 21 are inserted together to prevent dust in the external environment from entering the gap between the magnetic encoder sensor and the magnet 3, which is beneficial to improving the detection accuracy.

[0029] The above embodiments are only exemplary embodiments of the present utility model and are not used to limit the present utility model. The protection scope of the present utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present utility model within the essence and protection scope of the present utility model, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present utility model.

Claims

1. A housing assembly of a magnetic rotary encoder, comprising a sensor housing (1), characterized in that: A positioning ring (11) is provided at the top axis of the sensor housing (1), a fixing seat (2) is movably mounted on the positioning ring (11), and a magnet (3) is mounted on the axis of the fixing seat (2) at one end close to the sensor housing (1).

2. The housing assembly of a magnetic rotary encoder according to claim 1, characterized in that: The bottom of the sensor housing (1) is provided with a mounting cavity (12), a side wall of the mounting cavity (12) is provided with a wire outlet hole (13), the bottom side wall of the sensor housing (1) is provided with two groups of side ears (14), and the side ears (14) are provided with a connecting portion (15).

3. The housing assembly of a magnetic rotary encoder according to claim 1, characterized in that: A connection groove (21) matching with the positioning ring (11) is formed at one end of the fixing seat (2) close to the sensor housing (1).

4. The housing assembly of a magnetic rotary encoder according to claim 3, characterized in that: A plurality of groups of strip-shaped protrusions (16) are provided on the outer side wall of the positioning ring (11), and the strip-shaped protrusions (16) are longitudinally arranged on the positioning ring (11).

5. The housing assembly of a magnetic rotary encoder according to claim 3, characterized in that: The fixing seat (2) is provided with a mounting groove (22) at the axis center of one end of the sensor housing (1), the magnet (3) is mounted in the mounting groove (22), and a plurality of bosses (23) are provided on the side wall of the mounting groove (22).

6. The housing assembly of a magnetic rotary encoder according to claim 5, characterized in that: A fixing groove (24) is provided at the axis of one end of the fixing seat (2) away from the sensor housing (1), and a plurality of groups of ribs (25) are provided on the side wall of the fixing groove (24).

7. The housing assembly of a magnetic rotary encoder according to claim 6, characterized in that: The fixing groove (24) and the mounting groove (22) are connected to each other via a through hole (26).

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