Protective permanent magnet brake

Abstract

The utility model relates to the field of permanent magnet brakes, and particularly discloses a protective permanent magnet brake which comprises a magnet yoke, a movable plate and a shaft sleeve which are sequentially arranged, an installation groove is formed in the end face of one side of the magnet yoke, and a friction ring coaxial with the magnet yoke is arranged in the installation groove. A plurality of permanent magnets are annularly and uniformly arranged in a gap between the friction ring and the outer edge of the magnet yoke, and the axes of the permanent magnets vertically point to the movable plate; the movable plate is arranged between the shaft sleeve and the friction ring, and an elastic piece is connected between the shaft sleeve and the movable plate; and the protective cover plate is arranged outside the magnet yoke in a sleeving manner so as to shield a gap between the friction ring and the movable plate. According to the utility model, the protective cover plate is arranged to isolate the contact between the connecting wire and the rotating armature, so that potential safety hazards are prevented, and a certain dustproof effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to permanent magnet brake technical field, specifically, relate to a protective permanent magnet brake. BACKGROUND

[0002] Permanent magnet brake belongs to normally closed power failure brake, has the effect of power failure safety protection, is mainly used for static holding brake (Holding brake, commonly known as zero speed brake). Permanent magnet brake has simple structure, small size, rapid response, release state noiseless, braking no slip and other advantages, especially suitable for servo motor, medical equipment, mechanical arm joint and other high positioning occasions.

[0003] And the brake structure is generally built-in in the front end of the motor, and the brake power connection line needs to pass through the recess of the motor shell to the power socket in the rear end of the motor, in the long time use of the motor, the brake connecting line can possibly fall from the recess of the motor shell to the armature of the brake structure and rub with the armature rotating with the rotor of the motor, thereby causing wire breakage, electric leakage, fire and other accidents. Therefore, a protective permanent magnet brake is designed. UTILITY MODEL CONTENTS

[0004] The utility model discloses a protective permanent magnet brake can isolate the contact of connecting line and rotating armature to prevent the generation of potential safety hazard.

[0005] The utility model discloses a protective permanent magnet brake, including the magnetic yoke, movable plate and shaft sleeve that arrange gradually, one side end surface of magnetic yoke is equipped with the installation recess, be provided with the friction ring with the coaxial arrangement of magnetic yoke in installation recess, the annular uniform arrangement of a plurality of permanent magnets is arranged between the outer edge of friction ring and magnetic yoke, and the axis of permanent magnet is perpendicular to point to movable plate, movable plate is located between shaft sleeve and friction ring, and the elastic piece is connected between shaft sleeve and movable plate, the protective cover board is covered in the outside of magnetic yoke to block the clearance between friction ring and movable plate.

[0006] Further, the first step surface of the inner edge is arranged in the installation recess, the second step surface of the radial outer edge is arranged on the outer edge of the friction ring, and the permanent magnet is clamped between the first step surface and the second step surface.

[0007] Further, the permanent magnet is a circular arc piece structure, and the magnetic pole of the permanent magnet points to the movable plate.

[0008] Further, the mounting clamping slot is arranged on the outer surface of the magnetic yoke, and one end of the protective cover board is adapted and clamped into the mounting clamping slot.

[0009] Furthermore, the protective cover plate is provided with a plurality of notches to form a tooth-shaped structure.

[0010] Furthermore, it also includes a magnetic resistance gasket, which is arranged between the magnetic yoke and the friction ring for separation; the magnetic resistance gasket is made of copper material.

[0011] Furthermore, it also includes a mounting shaft hole, which is arranged along the radial direction of the sleeve and is used to insert a screw.

[0012] The technical solution of the present invention has at least the following advantages and beneficial effects: the present invention seals and blocks the exposed rotating movable plate by installing a protective cover plate on the outside of the plate, that is, if the connecting wire falls during use, it will only come into contact with the stationary protective cover plate, and will not come into contact with the rotating movable plate, effectively avoiding accidental failures such as damage to the connecting wire, leakage, and fire. At the same time, it also avoids dust from entering the gap of the brake and affecting the heat dissipation of the friction ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the protective permanent magnetic brake in the present utility model;

[0014] Figure 2 This is a front view of one side of the shaft sleeve of the protective permanent magnetic brake in the utility model;

[0015] Figure 3 for Figure 2 Cross-sectional view at AA in FIG;

[0016] Figure 4 This is an exploded view of the protective permanent magnet brake in the present utility model.

[0017] Figure markings: 1-yoke, 11-mounting groove, 111-first step surface, 12-mounting slot, 2-moving plate, 3-sleeve, 31-mounting shaft hole, 4-friction ring, 41-second step surface, 5-permanent magnet, 6-reluctance gasket, 7-elastic part, 8-protective cover plate, 81-notch. DETAILED DESCRIPTION

[0018] The following is further described in conjunction with specific embodiments. Figures 1-4As shown, this embodiment is a protective permanent magnet brake, comprising a magnetic yoke 1, a movable plate 2 and a sleeve 3 arranged in sequence, a mounting groove 11 is provided on one end face of the magnetic yoke 1, a friction ring 4 coaxially arranged with the magnetic yoke 1 is provided in the mounting groove 11, a plurality of permanent magnets 5 are evenly arranged in a ring shape in the gap between the friction ring 4 and the outer edge of the magnetic yoke 1, and the axis of the permanent magnet 5 is perpendicular to the movable plate 2; the movable plate 2 is arranged between the sleeve 3 and the friction ring 4, and an elastic member 7 is connected between the sleeve 3 and the movable plate 2; a protective cover plate 8 is sleeved on the outside of the magnetic yoke 1 to block the gap between the friction ring 4 and the movable plate 2; specifically, a plurality of permanent magnets 5 are arranged in a ring shape on the movable plate 2 and the yoke 1. When the yoke 1 is powered off, the magnetic force of the permanent magnet 5 attracts the movable plate 2 and the friction ring 4 to fit together for braking, and the movable plate 2 pulls the elastic member 7. When the yoke 1 is powered on, the magnetic flux lines of the yoke 1 and the permanent magnet 5 are opposite to each other and cancel each other out, so that the elastic force of the elastic member 7 pulls back the movable plate 2, and the movable plate 2 and the friction ring 4 are separated to release the brake. During this process, there is a certain movable gap between the movable plate 2 and the friction ring 4 in the axial direction. The protective cover plate 8 is fixedly installed on the surface of the yoke 1 so that the protective cover plate 8 can shield the movable plate 2 and the friction ring 4. It is convenient to disassemble and assemble, so that the connecting line will not cause contact wear with the movable plate 2, or even cause safety hazards.

[0019] like Figure 3 As shown, in some embodiments, a first step surface 111 is provided on the inner edge of the mounting groove 11, and a second step surface 41 is provided on the outer edge of the friction ring 4 along the radial outer edge. The permanent magnet 5 is clamped between the first step surface 111 and the second step surface 41. Specifically, during installation, the permanent magnets 5 are first placed one by one in a circle, with one end of the permanent magnet 5 resting against the first step surface 111. After the friction ring 4 is installed, the second step surface 41 of the friction ring 4 rests against the other end of the permanent magnet 5, thereby limiting and fixing the permanent magnet 5.

[0020] Reference Figure 4 As shown, the permanent magnet 5 in this embodiment is an arc-shaped sheet structure, and the magnetic pole of the permanent magnet 5 points to the moving plate 2; specifically, the magnetic force of multiple permanent magnets 5 can maximize the effect on the moving plate 2 for attraction, and its installation position has high magnetism and does not fail, avoiding shaking during operation, the occurrence of accidents such as bumps and damages, and extending its service life.

[0021] like Figure 1 and Figure 4 As shown, the outer surface of the yoke 1 in this embodiment is provided with a mounting slot 12, and one end of the protective cover plate 8 is adapted to be snapped into the mounting slot 12; specifically, the protective cover plate 8 adopts a snap-on method to prevent it from axial movement and exposing the gap at the movable plate 2, and it is relatively convenient to disassemble and assemble.

[0022] like Figure 1As shown, the protective cover plate 8 is provided with a plurality of notches 81 to form a tooth-shaped structure. When the protective cover plate 8 is disassembled, it can be tilted from the notch 81 so that one end of the protective cover plate 8 has deformation space to detach from the installation slot 12.

[0023] like Figure 3 As shown, this embodiment further includes a reluctance gasket 6, which is provided between the magnetic yoke 1 and the friction ring 4 for separation; the reluctance gasket 6 is made of copper material; specifically, the reluctance gasket 6 prevents the magnetic lines from diffusing when the brake loses power, thereby providing isolation, and the high conductivity of copper enables it to effectively shield interference from external electromagnetic fields, which is very important in many electronic devices and systems. Therefore, copper is a good reluctance material.

[0024] like Figure 3 As shown, this embodiment also includes an installation shaft hole 31, which is arranged along the radial direction of the sleeve 3, and is used to insert a screw. Specifically, the motor shaft passes through the sleeve 3, and a screw or bolt is inserted radially to connect it to the motor shaft, thereby completing the connection operation between the brake and the motor. The installation is simple and convenient.

[0025] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A protective permanent magnet brake, comprising a magnetic yoke (1), a moving plate (2) and a sleeve (3) arranged in sequence, characterized in that: A mounting groove (11) is provided on one end face of the magnetic yoke (1), a friction ring (4) coaxially arranged with the magnetic yoke (1) is provided in the mounting groove (11), a plurality of permanent magnets (5) are evenly arranged in an annular shape in the gap between the friction ring (4) and the outer edge of the magnetic yoke (1), and the axes of the permanent magnets (5) are perpendicularly directed toward the moving plate (2); The movable plate (2) is arranged between the shaft sleeve (3) and the friction ring (4), and an elastic member (7) is connected between the shaft sleeve (3) and the movable plate (2); A protective cover plate (8) is sleeved on the outside of the magnetic yoke (1) to shield the gap between the friction ring (4) and the moving plate (2).

2. The protective permanent magnetic brake according to claim 1, characterized in that: A first step surface (111) is provided on the inner edge of the mounting groove (11), a second step surface (41) is provided on the outer edge of the friction ring (4), and the permanent magnet (5) is clamped between the first step surface (111) and the second step surface (41).

3. The protective permanent magnetic brake according to claim 1, characterized in that: The permanent magnet (5) is an arc-shaped sheet structure, and the magnetic pole of the permanent magnet (5) points toward the moving plate (2).

4. The protective permanent magnetic brake according to claim 1, characterized in that: The outer surface of the magnetic yoke (1) is provided with a mounting slot (12), and one end of the protective cover plate (8) is adapted to be snapped into the mounting slot (12).

5. The protective permanent magnetic brake according to claim 4, characterized in that: The protective cover plate (8) is provided with a plurality of notches (81) to form a tooth-shaped structure.

6. The protective permanent magnetic brake according to claim 1, characterized in that: It also includes a magnetic resistance gasket (6), which is arranged between the magnetic yoke (1) and the friction ring (4) for separation.

7. The protective permanent magnetic brake according to claim 6, characterized in that: The magnetic resistance gasket (6) is made of copper material.

8. The protective permanent magnet brake according to claim 1, characterized in that: It also includes a mounting shaft hole (31), which is arranged along the radial direction of the shaft sleeve (3) and is used for inserting a screw.

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