CN213515469U

CN213515469U - Angle sensor based on digital signal

Info

Publication number: CN213515469U
Application number: CN202021002810.8U
Authority: CN
Inventors: 赵军
Original assignee: Beijing Heguang Feiyi Electromechanical Science & Technology Co ltd
Current assignee: Beijing Heguang Feiyi Electromechanical Science & Technology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-06-22
Anticipated expiration: 2030-06-04

Abstract

The utility model discloses an angle sensor based on digital signals, which comprises an outer shell, a small nut, a bearing, a rotating shaft, an inner shell, a circuit board and a rear cover plate which are connected in sequence from front to back; the outer shell is sequentially provided with a flange section, a larger outer circle section and a smaller outer circle section from back to front; the rotating shaft is sequentially provided with a larger-diameter end, a smaller-diameter end and a square shaft section from back to front; the inner shell is a hollow cylinder divided into a front section and a rear section by a partition wall. The utility model discloses in the miniaturization, improved the interference killing feature, solved the sensor deformation problem under the abominable industrial use environment such as high low temperature, high overload moreover, guarantee sensor normal operation. The sensor is particularly suitable for occasions with frequent mechanical change, severe environment, long service life and high reliability.

Description

Angle sensor based on digital signal

Technical Field

The utility model relates to a be applied to measurement technical field such as aviation, electron, machinery, weaving, boats and ships, metallurgy, auto industry, industry control gear speed measurement, rack survey displacement, especially relate to an angle sensor based on digital signal.

Background

There are two forms of output signal sensors currently used in industrial machinery. One is mechanical, namely contact type, the resistance value is changed along with relative displacement by sliding contact of the electric brush and the resistance substrate, the output voltage signal is correspondingly changed, the mechanical part is easy to wear, or the contact piece is possibly separated instantly along with vibration of industrial machine equipment, and poor contact is caused; in addition, in the application process, abrasion scraps of the electric brush and the resistance substrate can be attached between the electric brush and the resistance substrate, poor contact or change of output resistance can be generated, finally, signals cannot be normally transmitted, and the service life is limited. The second one is non-contact type, and uses Hall effect, that is, the principle of the relation between the output voltage of Hall element and external magnetic field and the cosine of the included angle between magnetoacoustic and element normal line, and sets a magnet at the front end of the rotor connected with the rotating shaft, and uses the magnetic sensor with interval and opposite to the magnet to detect the rotating angle of rotor angular displacement. The angle sensor adopts a high-performance intelligent integrated magnetic sensitive element, converts mechanical rotation or angular displacement into an electric signal to be output, and performs non-contact measurement. It is an ideal product for replacing optical encoder, rotary transformer and conductive plastic potentiometer.

The non-contact sensor in the prior art usually adopts a bearing structure, has a complex structure, and is difficult to realize miniaturization. For example, CN202041218U discloses a non-contact magnetostrictive displacement sensor, which includes a housing, an end cover at one end of the housing, at least one blind counterbore recessed inwards on the outer surface of the end cover, a sensor circuit board arranged in the housing, hall switches fixed on the circuit board and having the same number as the blind counterbores, the hall switches being close to the blind counterbores; and the debugging pen is provided with magnetic particles slightly smaller than the inner diameter of the blind counter bore. The displacement sensor can effectively protect elements of the displacement sensor, but the displacement sensor is relatively complex in structure and large in size, and the sensor is required to be debugged by a debugging pen, so that the operation is not convenient enough.

Non-contact angle sensors, however, are largely classified into those based on analog signals and those based on digital signals. The existing angle sensor based on digital signals is simple in circuit and structure, can be miniaturized, but is poor in anti-interference capability, and the problem of deformation of the sensor under severe industrial use environments such as high and low temperatures and high overload conditions is serious, so that the sensor fails to work.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to solve at least one of the above problems, and the object is achieved by the following technical solutions.

The utility model provides an angle sensor based on digital signal, include:

an angle sensor based on digital signals comprises an outer shell, a small nut, a bearing, a rotating shaft, an inner shell, a circuit board and a rear cover plate which are sequentially connected from front to back; the outer shell is sequentially provided with a flange section, a larger outer circle section and a smaller outer circle section from back to front; the rotating shaft is sequentially provided with a larger-diameter end, a smaller-diameter end and a square shaft section from back to front; the inner shell is a front hollow cylinder and a rear hollow cylinder which are divided by a partition wall; wherein,

the rotating shaft is arranged in the front section cavity of the inner shell, and the circuit board is arranged in the rear section cavity of the inner shell;

a magnet is arranged at the rear end of the rotating shaft with the larger diameter;

the circuit board is a digital magnetic sensor and is used for measuring a rotating angle.

Further, the flange section is of a special-shaped structure and is composed of a cylinder and a rectangle.

Further, the material of the outer shell and the rear cover plate is magnetic shielding material.

Further, the magnetic shielding material is permalloy, electrician pure iron or iron-aluminum alloy.

Further, the thickness of the outer shell is 15.5-25.5 mm.

Furthermore, the thickness of the larger end of the rotating shaft is 4.3-8.3 mm; the thickness of the end with the smaller diameter is 5.7-9.7 mm.

Furthermore, a concentric circular hole is formed in the center of the rear end face of the end with the larger diameter and used for placing the magnet.

Furthermore, the front of the circuit board is provided with a bulge for simulating the structure size.

Furthermore, the rear cover plate is of a special-shaped structure, and the rear end face of the flange section is provided with a step with the same shape as the rear cover plate.

The utility model discloses an integrated magnetic sensing element of high performance intelligence turns into digital signal of telecommunication output, non-contact measurement with mechanical rotation or angle displacement. The sensor has the advantages that the miniaturization is realized, the anti-interference capability is improved, the problem of deformation of the sensor in severe industrial use environments such as high and low temperature and high overload is solved, and the normal work of the sensor is ensured. The sensor is particularly suitable for occasions with frequent mechanical change, severe environment, long service life and high reliability.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

figure 1 is a schematic perspective view of the present invention,

fig. 2 is a schematic diagram of the explosion structure of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Referring to fig. 1 and fig. 2, the present invention provides an angle sensor based on digital signals, including: the novel motor comprises an outer shell, a small nut, a bearing, a rotating shaft, an inner shell, a circuit board and a rear cover plate which are sequentially connected from front to back.

1. Structure of outer housing 1 and inner housing:

the outer shell is composed of a hollow cylindrical surface and a rectangular flange, the cylindrical surface is used for being matched with the mounting structure of the inner shell in a centering mode, and the shape of the rectangular flange is determined according to the mounting structure. The outer shell is sequentially provided with a flange section 1-3, a larger outer circle section 1-2 and a smaller outer circle section 1-1 from back to front. The front end of the smaller outer circle section 1-1 is of a bowl-shaped structure, and 2-4 screw holes are axially formed in the bottom surface of the bowl; the rear end of the smaller outer circle section 1-1 is matched with the front section cavity 6-1 of the inner shell 6 and is fixedly installed with the inner shell 6 through a screw hole axially arranged on the bottom surface of the bowl. The larger outer circle section 1-2 is matched with the rear section cavity 6-2 of the inner shell 6. And rectangular flanges 1-3 are arranged on the outer shell and used for concentrically fixing the sensor on the equipment to be tested. The thickness of the outer shell is 15.5-25.5 mm.

The inner shell 6 is a cylindrical aluminum structure, two ends of the inner shell are hollowed inwards, the middle of the inner shell is provided with a wall structure to divide the inner shell into a front hollow part and a rear hollow part which are not communicated with each other, and the diameter of the rear hollow part 6-2 is larger than that of the front hollow part 6-1. The front end face of the front section cavity 6-1 is axially provided with 2-4 screw holes which are used for being fixedly installed with a bowl-shaped structure at the front end of the smaller outer circle section 1-1 of the outer shell through screws; the bottom surface of the rear section cavity 6-2 is also provided with 2-4 screw holes in the axial direction for being fixedly installed with the circuit board 7 through screws. The mechanical rotating part, namely the rotating shaft 4, is arranged in the front section cavity 6-1 of the inner shell, and the electrical part, namely the circuit board 7, is arranged in the rear section cavity of the inner shell. The mechanical rotating part is isolated from the electrical part.

2. The rotating shaft 4 is sequentially provided with a larger-diameter end 4-3, a smaller-diameter end 4-2 and a square shaft section 4-1 from back to front. The magnet 5 is arranged in the rotating shaft 4, and a concentric counter bore is formed in the center of the rear end face of the end, with the larger diameter, of the rotating shaft and used for placing the magnet.

The thickness of the larger end of the rotating shaft is 4.3-8.3 mm; the thickness of the end with the smaller diameter is 5.7-9.7 mm.

The rotating shaft is made of stainless steel or brass and comprises a larger-diameter end, a smaller-diameter end and a square shaft section which are sequentially connected. Because the rotating shaft is easy to displace in the use process, particularly under the high overload working condition, the angular transducer is required to bear high overload, namely the gravity acceleration of 100 times of the self weight, in two axial directions and in the radial direction respectively in the working process, and can ensure normal working at the lowest temperature of-40 ℃ and the highest temperature of 50 ℃. Thus, the shaft 4 is free to rotate only within the cavity structure of the inner housing 6 without axial and radial displacement. The inner shell body 6 is sleeved in the outer shell body, the rotating shaft 4 and the bearing 3 are fixed together, the phenomenon that the sensor works due to the fact that the shaft 4 moves when encountering axial impact is avoided, the rotating shaft can be effectively limited in the working area of the rotating shaft, and the phenomenon that the rotating shaft is blocked due to displacement is avoided, so that the sensor cannot work normally.

The square shaft section is a structure with a square section with a certain length, the front end of the square shaft section extends out of the outer shell 1, the square shaft section extends out of the outer shell 1 and then is connected with a part to be measured, meanwhile, a connecting structure of a rotating shaft of the part to be measured is processed into a hole-shaped structure with the same shape as the square section of the square shaft section, and a shaft 4 fixedly connected with the rear angle displacement sensor can concentrically rotate with an external rotating shaft. The magnet is cylindrical or annular and can rotate synchronously with the rotating shaft.

The rotating shaft can freely rotate but cannot radially displace when extending into the cavity of the inner shell 6, and the machining precision of the outer diameter of the rotating shaft and the inner diameter of the cavity of the inner shell 6 can be guaranteed, namely, the machining tolerance between the inner diameter of the cavity of the inner shell 6 and the outer diameter of the rotating shaft is guaranteed to be within 0.02 mm. Meanwhile, an oil way is carved on the inner wall of the inner shell 6 to ensure that lubricating oil is filled in the oil way during rotation. During installation, the larger end of the diameter of the rotating shaft is firstly installed in the cavity of the inner shell 6, then the small nut 2 and the bearing 3 are sequentially sleeved into the rotating shaft and pushed to the inner shell 6, finally the rotating shaft is fixed between the inner shell 6 and the outer shell 1 by screws, and the square shaft section of the rotating shaft extends out of the outer shell 1 so as to be connected with an external rotating mechanism, so that the thickness of the larger part of the diameter of the shaft is ensured, and the depth of the larger part of the diameter of the shaft is less than that of the bowl-shaped structure of the.

3. The circuit board 7 is a digital magnetic sensor for measuring the rotation angle. Because the digital magnetic sensor is relatively complex and comprises more electronic components, but the thickness of the rear section cavity 6-2 of the inner shell 6 is limited, and the height of the electric components of the circuit board 7 cannot exceed the thickness of the cavity 6-2, the arrangement of the bulge in the front of the circuit board can simulate the thickness of the cavity 6-2 during installation, and construction is convenient. The edge of the circuit board 7 is provided with 2-4 screw holes, and the circuit board 7 is fixed on the rear section cavity 6-2 of the inner shell 6 through screws, namely, the magnetic sensor is fixed at the end of the inner shell 6.

4. The rear cover plate 8 is also special-shaped, and has steps with the same shape corresponding to the outer shell, so that the rear cover plate is flush with the surface of the outer shell after being installed, the rear cover plate is of a special-shaped structure, and the steps with the same shape as the rear cover plate are arranged on the rear end face of the flange section. The back cover plate plays the roles of protecting, sealing and shielding the circuit board, prevents external signals from interfering components in the circuit board, and ensures that the whole body meets the requirements of water resistance and dust resistance

The outer shell 1 and the rear cover plate 8 are made of magnetic shielding materials and are fixedly connected with each other to form a complete magnetic shielding system. The utility model discloses an outer casing and back shroud 8 are the realization the utility model discloses an anti-interference important guarantor is accurate. Therefore, the material is a material with high magnetic conductivity and small remanence, and the magnetic shielding material is generally divided into three types, namely a high magnetic conductive material, a medium magnetic conductive material and a high saturation material. The magnetic conductivity of the high magnetic conductive material is between 80000 and 350000, and the saturation field of the high magnetic conductive material can reach 7500Gs after heat treatment; medium permeability materials are commonly used with high permeability materials, with permeability values from 12500-150000, saturation field 15500 Gs; the magnetic permeability value of the high saturation field is 200-50000, and the saturation field can reach 18000-21000 Gs. Therefore, the selected material with high magnetic permeability and small remanence is high magnetic permeability material selected from permalloy, electrician pure iron, iron-aluminum alloy or similar materials.

The assembly process of the angular displacement sensor of the present embodiment will be briefly described below.

Firstly, a circuit board 7 welded with an output signal line and a power line, namely a magnetic sensor, is fixed on a rear section cavity 6-2 of an inner shell 6 by screws, and one side with the circuit board is arranged inwards, so that the circuit board is sealed in a closed and dry space, the conditions of chip corrosion, circuit damage and the like which are possibly caused by long-term use in a severe environment are avoided, and the service life of electronic components can be prolonged. Then, the end 4-3 with larger diameter of the rotating shaft (i.e. the end with the magnet embedded and bonded at the top end) is slowly inserted into the front section cavity 6-1 of the inner shell 6. Note that this end is a sliding friction surface, and a proper amount of oil is added to the inner case 6 when mounting. Then, along the direction of the square shaft section 4-1 of the rotating shaft 4, the bearing 3 and the small nut 2 are sequentially sleeved on the rotating shaft 4, so that the shaft 4 can freely rotate in the inner shell 6, and meanwhile, the displacement of the shaft 4, which does not influence the measurement precision, is ensured in the structural machining precision. The inner shell 6 with the magnetic sensor and the shaft 4 is arranged in the outer shell, so that the front section cavity 6-1 of the inner shell 6 is arranged in the smaller excircle section 1-1 of the outer shell 1, the rear section cavity 6-2 is arranged in the larger excircle section 1-2, and four through holes on the outer shell 1 are aligned with four threaded holes on the inner shell 6 and screwed down by screws, thus the inner shell 6 is fixed in the outer shell. And finally, the rear cover plate 8 is arranged at the step of the rear end surface of the flange section 1-3 of the outer shell 1 to form an integral shielding shell system. Under the environment of an external magnetic field, according to the known magnetic principle, the external magnetic field forms a loop through a high-permeability material of the shell of the angular displacement sensor, and cannot influence the internal working magnetic field of the sensor, so that the effect of magnetic shielding is achieved.

In a specific embodiment, the utility model provides an angle sensor is applied to small-size automation control equipment, and the motor of this equipment drives the test unit and rotates, and this angle sensor installs in one side of motor for the rotation data of test motor. In the working process of the device, 100 times of weight acceleration exists in both axial directions and radial directions, so that the axial displacement of the rotating shaft of the angle sensor is required to be less than 0.1mm, and the normal operation of the testing device is ensured. The diameter range of the larger end of the rotating shaft is 11-15mm, and the thickness is 4.3-8.3 mm; the diameter range of the end with the smaller diameter is 8-12mm, and the thickness is 5.7-9.7 mm; the rotating shaft is connected with the part to be measured by adopting an 8x8mm square shaft.

The center of the rear end face of the end with the larger diameter of the rotating shaft is provided with a concentric counter bore used for placing a magnet and used for being matched with a chip in an induction mode.

The utility model discloses an angle sensor is new generation's non-contact sensor, and it and actuating mechanism axle sleeve coaxial arrangement for measure the deflection angle of pivot, to control system feedback angle signal. The sensor effectively solves the problem of sensor deformation under severe industrial use environments such as high and low temperature, high overload and the like.

It will be understood that, although the terms front, back, etc. may be used herein to describe elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be used merely to connote a connection of elements, components, regions, layers or sections.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An angle sensor based on digital signals, characterized by: the device comprises an outer shell, a small nut, a bearing, a rotating shaft, an inner shell, a circuit board and a rear cover plate which are sequentially connected from front to back; the outer shell is sequentially provided with a flange section, a larger outer circle section and a smaller outer circle section from back to front; the rotating shaft is sequentially provided with a larger-diameter end, a smaller-diameter end and a square shaft section from back to front; the inner shell is a front hollow cylinder and a rear hollow cylinder which are divided by a partition wall; wherein,

2. The angle sensor of claim 1, wherein the flange section is a profiled structure comprised of a cylindrical shape and a rectangular shape.

3. The angle sensor of claim 1, wherein the material of the outer housing and the back cover plate is a magnetic shielding material.

4. The angle sensor of claim 3, wherein the magnetic shielding material is permalloy, electrical pure iron, or iron-aluminum alloy.

5. An angle sensor according to claim 1, wherein the outer housing has a thickness of 15.5-25.5 mm.

6. The angle sensor of claim 1, wherein the shaft has a thickness of 4.3-8.3mm at the end with the larger diameter; the thickness of the end with the smaller diameter is 5.7-9.7 mm.

7. An angle sensor according to claim 1 or 5, wherein the rear end face of the end with the larger diameter is provided with a concentric circular hole at its center for receiving the magnet.

8. An angle sensor according to claim 1 or 6, wherein the circuit board is provided with a bump on the front for structural dimensional simulation.

9. The angle sensor of claim 1, wherein the back cover plate is of a profiled structure, and a rear end face of the flange section is provided with a step of the same shape as the back cover plate.