A brush lifting device

Abstract

The present invention relates to the field of motor detection, and aims to solve the problem of inconvenience in measuring the electrical parameters of the motor rotor, and provides a brush lifting device, comprising: a base, which has a receiving hole; an electromagnet is provided at the lower part of the receiving hole, and the electromagnet has a wire for connecting to an external power supply; an insulating cylinder is fixedly provided at the upper part of the receiving hole; a cover shell, which can be movably matched in the insulating cylinder and can move relative to the insulating cylinder along the axial direction of the insulating cylinder; a permanent magnet, which is fixedly connected to the cover shell and vertically corresponds to the electromagnet; and a brush, which is fixedly provided at the top of the cover shell and has a measuring lead for connecting to an external circuit; wherein the inner circumference of the insulating cylinder and / or the outer circumference of the cover shell are provided with grooves distributed along the circumferential direction, and the grooves are parallel to the movement direction of the cover shell. The beneficial effects of the present invention are that the detection is convenient and it is not easy to form large-area flaky dust scabs on the wall of the insulating cylinder.

Description

Technical Field

[0001] The invention relates to the field of motor detection, and in particular to a brush lifting device. Background Art

[0002] In order to measure some electrical parameters of the motor rotor, a specially designed device (brush device) is required to form a measurement loop. In the prior art, this function is inconvenient to operate. Summary of the invention

[0003] The present invention aims to provide a brush lifting device to solve the problem of inconvenience in measuring the electrical parameters of a motor rotor.

[0004] The embodiment of the present invention is achieved as follows:

[0005] A brush lifting device, comprising:

[0006] A base having a receiving hole; an electromagnet is provided at the lower part of the receiving hole, and the electromagnet has a wire for connecting to an external power source; an insulating cylinder is fixedly provided at the upper part of the receiving hole;

[0007] A cover shell, which can be movably fitted in the insulating cylinder and can move relative to the insulating cylinder along the axial direction of the insulating cylinder;

[0008] a permanent magnet, which is fixedly connected to the cover and vertically corresponds to the electromagnet; and

[0009] A brush, which is fixedly arranged on the top of the housing and has a measuring lead for connecting to an external circuit;

[0010] The inner circumferential surface of the insulating cylinder and / or the outer circumferential surface of the cover shell are provided with grooves distributed along the circumferential direction, and the grooves are parallel to the movement direction of the cover shell.

[0011] When the brush lifting device in this scheme is used, the electromagnet is energized, the magnetic field generated by the electromagnet repels the permanent magnet, and the brush moves upward under the repulsive force until it contacts the rotating rotor, forming a measurement circuit, which can conveniently detect the electrical parameters of the motor rotor. After the measurement is completed, a reverse voltage is applied to the electromagnet, and the brush is separated from the rotor under the action of attraction and gravity, and the entire monitoring circuit is disconnected, making the measurement convenient. In addition, the grooves set in this process reduce the contact area between the insulating cylinder and the cover, and the dust on the contact surface can diffuse to the groove space on both sides and is not easy to deposit and adhere, so that it is not easy to form large-area flaky dust scabs on the insulating cylinder wall.

[0012] In one embodiment:

[0013] The groove vertically penetrates the upper and lower end surfaces of the insulating cylinder and / or the cover shell to form an air flow channel connecting the outside and the inside of the accommodating hole.

[0014] In one embodiment:

[0015] The outer circumferential surface of the cover shell is a cylindrical surface, and the outer circumferential surface of the cover shell is provided with a plurality of grooves evenly distributed along the circumferential direction, and each of the grooves penetrates along the height direction of the cover shell.

[0016] In one embodiment:

[0017] The cross section of the groove of the cover shell is semicircular or triangular.

[0018] In one embodiment:

[0019] The receiving hole is a stepped hole consisting of a lower hole with a smaller diameter and an upper hole with a larger diameter;

[0020] The electromagnet is fitted in the lower hole; the insulating tube is fitted in the upper hole, and the lower end surface thereof is fitted on the step surface of the accommodating hole.

[0021] In one embodiment:

[0022] The step surface of the accommodating hole vertically corresponds to the lower edge of the cover shell to serve as a lower limit structure of the cover shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a top view of a brush lifting device in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Proportional view of the section view along line AA;

[0026] Figure 3 is a front view of a cover in an embodiment of the present invention;

[0027] Figure 4 It is a top view of the cover shell in the embodiment of the present invention.

[0028] Icons: 1-base; 2-brush; 3-shielding tube; 4-electromagnet; 5-cover; 6-insulating tube; 7-measuring lead; 8-conducting wire; 9-screw; 10-permanent magnet; 11-protective cover; 12-accommodating hole; 13-groove; Y1-movement direction; P1-step surface; 30-motor brush lifting device. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second" and the like appear in the description of the present invention, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example

[0036] See also Figure 1 and Figure 2 The present embodiment provides a brush lifting device 30, which includes a base 1, a brush 2, a shielding tube 3, an electromagnet 4, a cover 5, an insulating tube 6, a measuring lead 7, a conductor 8, a permanent magnet 10 and a protective cover 11.

[0037] The base 1 has a receiving hole 12, a shielding cylinder 3 is provided at the lower part of the receiving hole 12, and an electromagnet 4 is installed in the shielding cylinder 3. The electromagnet 4 has a wire 8 for connecting to an external power source. The electromagnet 4 is connected to the external power source through the wire 8 to generate magnetism, and the magnetism disappears after the power is cut off. An insulating cylinder 6 is fixedly provided at the upper part of the receiving hole 12.

[0038] The cover 5 can be movably fitted in the insulating cylinder 6 and can move relative to the insulating cylinder 6 along the axial direction of the insulating cylinder 6. The permanent magnet 10 is connected to the cover 5 through the protective cover 11 and corresponds to the electromagnet 4. The brush 2 is fixedly arranged on the top of the cover 5 and has a measuring lead 7 for connecting to an external circuit.

[0039] See also Figure 3 and Figure 4 The inner circumferential surface of the insulating cylinder 6 and / or the outer circumferential surface of the cover shell 5 are provided with grooves 13 distributed along the circumferential direction, and the grooves 13 are parallel to the movement direction Y1 of the cover shell 5 .

[0040] When the brush lifting device 30 in this scheme is used, the electromagnet 4 is energized, the magnetic field generated by the electromagnet 4 repels the permanent magnet, and the brush 2 moves upward under the action of the repulsive force until it contacts the rotating rotor, forming a measurement circuit, that is, the electrical parameters of the motor rotor can be easily detected. After the measurement is completed, a reverse voltage is applied to the electromagnet 4, and the brush 2 is separated from the rotor under the action of attraction and gravity, and the entire monitoring circuit is disconnected, which is convenient for measurement. In addition, the groove 13 set in this process reduces the contact area between the insulating tube 6 and the cover 5, and the dust in the contact surface can diffuse to the space of the grooves 13 on both sides and is not easy to deposit and adhere, so that it is not easy to form large-area flaky dust scabs on the wall of the insulating tube 6.

[0041] As is known, the rotor parameter tests that need to be measured include resistance test, voltage resistance test and other parameter tests, and the corresponding measurement circuits can be based on common resistance test circuits or other corresponding circuits, which will not be described in detail here.

[0042] In this embodiment, the accommodating hole 12 is configured as a stepped hole consisting of a lower hole with a smaller diameter and an upper hole with a larger diameter. The shielding tube 3 fits in the lower hole. The insulating tube 6 fits in the upper hole, and its lower end face fits on the stepped surface P1 of the accommodating hole 12. The shielding tube 3 and the insulating tube 6 can reduce / shield the interference of the external electromagnetic environment on the internal electromagnet 4 or permanent magnet 10, thereby improving the accuracy of the experiment. Optionally, the upper part of the shielding tube 3 and the electromagnet 4 arranged therein extend into the cover 5, and are correspondingly located below the permanent magnet 10. In this way, there is an overlapping portion between the shielding tube 3, the cover 5 and the insulating tube 6, which can further improve the overall shielding capability and reduce the electromagnetic influence at the junction of the two.

[0043] Optionally, the cover 5 is a cup-shaped structure with an opening facing downward, and the protective cover 11 is a cup-shaped structure with an opening facing upward, and is cooperatively connected to the bottom wall of the cover 5 to form an accommodation space for accommodating the permanent magnet 10 together with the bottom wall of the cover 5 .

[0044] In one embodiment, the step surface P1 of the accommodating hole 12 vertically corresponds to the lower edge of the cover shell 5 to serve as a lower limit structure of the cover shell 5 .

[0045] See also Figure 3 and Figure 4 , the groove 13 vertically penetrates the upper and lower end surfaces of the insulating cylinder 6 and / or the cover shell 5 to form an airflow channel connecting the outside and the inside of the accommodating hole 12. By setting the groove 13 to be through as an airflow channel, it can be ensured that the atmospheric pressure inside and outside the device is equal, the air pressure resistance is eliminated, and the influence of the air pressure on the movement and corresponding speed of the brush 2 is avoided. In one embodiment, the outer peripheral surface of the cover shell 5 is a cylindrical surface, and the outer peripheral surface of the cover shell 5 is provided with a plurality of grooves 13 evenly distributed along the circumference, and each groove 13 penetrates along the height of the cover shell 5. Optionally, the cross-section of the groove 13 of the cover shell 5 is semicircular, triangular or other shapes.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A brush lifting device, characterized in that: include: A base having a receiving hole; an electromagnet is provided at the lower part of the receiving hole, and the electromagnet has a wire for connecting to an external power source; an insulating cylinder is fixedly provided at the upper part of the receiving hole; A cover shell is movably fitted in the insulating cylinder and can move relative to the insulating cylinder along the axial direction of the insulating cylinder; a permanent magnet, which is fixedly connected to the housing and vertically corresponds to the electromagnet; and a brush, which is fixedly arranged on the top of the housing and has a measuring lead for connecting to an external circuit; Wherein, the inner circumferential surface of the insulating cylinder and / or the outer circumferential surface of the cover shell are provided with grooves distributed along the circumferential direction, and the grooves are parallel to the movement direction of the cover shell; The groove vertically penetrates the upper and lower end surfaces of the insulating cylinder and / or the cover shell to form an air flow channel connecting the outside and the inside of the accommodating hole; The outer circumferential surface of the cover shell is a cylindrical surface, and the outer circumferential surface of the cover shell is provided with a plurality of grooves evenly distributed along the circumferential direction, and each of the grooves penetrates along the height direction of the cover shell; The cross section of the groove of the housing is semicircular or triangular; The receiving hole is a stepped hole consisting of a lower hole with a smaller diameter and an upper hole with a larger diameter; The electromagnet is fitted in the lower hole; the insulating tube is fitted in the upper hole, and its lower end surface is fitted on the step surface of the receiving hole; The step surface of the accommodating hole vertically corresponds to the lower edge of the cover shell to serve as a lower limit structure of the cover shell.

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