Electromagnetic brake with anti-jamming manual release function

Abstract

The utility model discloses an electromagnetic brake with an anti-locking manual release function, which comprises a stator, an armature, a brake disc, a cover plate, a movable block and an adjusting screw, a stator convex ring is arranged on the circumferential edge of one end of the stator close to the armature, a stator through hole is arranged on the stator convex ring, an armature through hole is arranged on the armature, an adjusting screw hole is arranged on the movable block, and the adjusting screw hole is arranged on the movable block. The movable blocks are arranged between the armature and the cover plate, screw rods of the plurality of adjusting screws penetrate through the plurality of stator through holes and the plurality of armature through holes which are in one-to-one correspondence and then are connected with adjusting screw holes in the plurality of movable blocks, and the movable blocks can move in the direction parallel to the axial direction of the adjusting screws and cannot rotate in any direction. According to the utility model, the adjusting screw is in clearance fit with the stator and the armature, and the movable block is in clearance fit with the armature and the cover plate, so that after the relative positions of the cover plate, the armature and the stator are changed, the adjusting screw can adaptively follow the position change, cannot be blocked, and can still realize a manual release function.

Description

Technical Field

[0001] The utility model relates to an electromagnetic brake, in particular to an electromagnetic brake with an anti-jamming manual release function. Background Art

[0002] In order to prevent the electromagnetic brake from being unable to release the braking state due to power failure or electromechanical failure, the electromagnetic brake is generally equipped with a manual release device. There are two main types of manual release devices for traditional electromagnetic brakes. The first type is Figure 1 As shown, the conventional cover plate 3 is provided with a plurality of (generally 2-4) screw holes and the screw rods of a plurality of (generally 2-4) conventional adjusting screws 1 respectively pass through the corresponding screw holes, and the screw rod ends of the conventional adjusting screws 1 are located in the gap between the conventional cover plate 3 and the conventional armature 7. When manual release is required, the plurality of conventional adjusting screws 1 are rotated so that the screw rod ends are against the conventional armature 7, so that the distance between the conventional armature 7 and the conventional cover plate 3 is increased, and the conventional brake disc 5 and the conventional friction plate 4 can rotate freely, thereby realizing the manual release function, i.e., the manual release function of the brake. The second type is as follows Figure 2 As shown, the screw rods of multiple (generally 2-4) traditional adjusting screws 1 are respectively passed through the corresponding through holes on the traditional armature 7 and connected with multiple (generally 2-4) screw holes on the traditional stator 9. When manual release is required, the tool is passed through the through hole 11 on the traditional cover plate 3 to drive the traditional adjusting screw 1 to rotate so that its nut moves toward the direction close to the traditional armature 7, until the nuts of multiple traditional adjusting screws 1 press the traditional armature 7, so that the distance between the traditional armature 7 and the traditional cover plate 3 is increased, and the traditional brake disc 5 and the traditional friction plate 4 can rotate freely, realizing the manual release function, that is, the manual release of the brake function. Figure 1 and Figure 2 Also shown are a conventional gasket 2 (which may include a flat gasket and a spring gasket), a conventional electromagnetic coil 6, a conventional return compression spring 8, and a conventional rotor 10. Figure 2 Also shown is a conventional expansion spring 12 placed in the corresponding through hole of the conventional armature 7 and sleeved on the outside of the screw of the conventional adjusting screw 1 (used to keep the conventional adjusting screw 1 in a tightened state to improve its stability and prevent it from rotating automatically). These are conventional structures of the prior art.

[0003] The manual release devices of the above two traditional electromagnetic brakes have the following problem: if the relative positions of the traditional cover plate 3, the traditional armature 7, and the traditional stator 9 change due to long-term use or the influence of external force during use, it is easy to cause the traditional adjusting screw 1 to get stuck and fail to realize the manual release function. Utility Model Content

[0004] The utility model aims to solve the above-mentioned problem and provides an electromagnetic brake with an anti-jamming manual release function in which an adjusting screw will not get stuck.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] An electromagnetic brake with an anti-jamming manual release function comprises a stator, an armature, a brake disc and a cover plate, the brake disc is located between the cover plate and the armature, the armature is located between the brake disc and the stator, the electromagnetic brake with an anti-jamming manual release function also comprises a movable block and an adjusting screw, a circumferential edge of one end of the stator close to the armature is provided with a stator convex ring protruding toward the outer circumference, a stator through hole is provided on the stator convex ring, an armature through hole is provided on the armature, an adjusting screw hole is provided on the movable block, the movable block is placed between the armature and the cover plate, the screw rods of the plurality of adjusting screws respectively pass through the corresponding plurality of stator through holes and the armature through holes, and are connected to the adjusting screw holes on the plurality of movable blocks, the movable block can move in a direction parallel to the axial direction of the adjusting screw between the armature and the cover plate and cannot rotate in any direction.

[0007] Preferably, in order to facilitate the function of preventing the movable block from rotating, a positioning column protruding in a direction close to the armature is provided on one side edge of the movable block, and the positioning column is located outside the outer peripheral edge of the armature and meets the following conditions: during the axial movement of the movable block by the adjusting screw, the positioning column always has a section overlapping with the armature in the axial direction of the adjusting screw.

[0008] Preferably, in order to maintain the stability of the adjusting screw to avoid its automatic rotation, an expansion spring is provided in the armature through hole, the expansion spring is sleeved on the screw rod of the adjusting screw, and the outer diameter of the expansion spring is larger than the aperture of the stator through hole.

[0009] Preferably, in order to prevent the nut of the adjusting screw from getting stuck with the stator through hole, a gasket is provided between the nut of the adjusting screw and the stator convex ring, and the gasket is sleeved on the screw rod of the adjusting screw through its through hole.

[0010] Preferably, in order to achieve a uniform and reliable clamping function for the armature, the number of the adjusting screw, the stator through hole, the armature through hole and the movable block are 2-4 and are evenly distributed along a virtual perfect circle.

[0011] The beneficial effects of the utility model are:

[0012] The utility model provides a stator convex ring on the stator, installs a movable block that can move but not rotate between the armature and the cover plate, and connects the screw rod of the adjusting screw to the stator through hole on the stator convex ring and the armature through hole on the armature after the screw rod is respectively inserted into the stator through hole on the stator convex ring and the armature through hole on the armature and the adjusting screw hole on the movable block. Since the adjusting screw, the stator and the armature are all clearance-fitted, and the movable block, the armature and the cover plate are also clearance-fitted, when the relative position between the cover plate, the armature and the stator changes due to long-term use or external force during use, the adjusting screw can adaptively follow the position change and will not get stuck, and the manual release function can still be realized. In addition, the movable block presses the armature, and a larger contact area between the movable block and the armature can be achieved compared with the screw rod of the traditional adjusting screw, thereby reducing or avoiding the scratching effect on the armature during the manual release process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the main cross-sectional structure of the first conventional electromagnetic brake;

[0014] Figure 2 It is a schematic diagram of the main cross-sectional structure of the second conventional electromagnetic brake;

[0015] Figure 3 It is a schematic diagram of the main cross-sectional structure of the electromagnetic brake with anti-stuck manual release function of the utility model;

[0016] Figure 4 It is a schematic diagram of the main sectional structure of the electromagnetic brake with anti-jamming manual release function of the utility model when it is in use. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] like Figure 3As shown, the electromagnetic brake with anti-stuck manual release function of the utility model comprises a stator 27, an armature 22, a brake disc 21, a cover plate 13, a movable block 14 and an adjusting screw 24, the brake disc 21 is located between the cover plate 13 and the armature 22, the armature 22 is located between the brake disc 21 and the stator 27, a stator convex ring 16 protruding toward the circumferential direction is provided on the circumferential edge of one end of the stator 27 close to the armature 22, a stator through hole 20 is provided on the stator convex ring 16, an armature through hole 19 is provided on the armature 22, and a movable block 14 is provided on the stator 27. An adjusting screw hole (not marked in the figure) is provided on the block 14, and the movable block 14 is placed between the armature 22 and the cover plate 13. The screw rods of the multiple adjusting screws 24 respectively pass through the corresponding multiple stator through holes 20 and multiple armature through holes 19 and are connected to the adjusting screw holes on the multiple movable blocks 14. The movable block 14 can move between the armature 22 and the cover plate 13 in a direction parallel to the axial direction of the adjusting screw 24 (that is, the distance between the armature 22 and the cover plate 13 is greater than the corresponding width of the movable block 14) and cannot rotate in any direction.

[0019] like Figure 3 As shown, the utility model also discloses the following more optimized specific structures:

[0020] In order to facilitate the function of preventing the movable block 14 from rotating, a positioning column 15 protruding in the direction close to the armature 22 is provided on one side edge of the movable block 14. The positioning column 15 is located outside the outer peripheral edge of the armature 22 and meets the following conditions: during the axial movement of the movable block 14 by the adjusting screw 24, the positioning column 15 always has a section overlapping with the armature 22 in the axial direction of the adjusting screw 24.

[0021] In order to maintain the stability of the adjusting screw 24 and prevent it from rotating automatically, a tension spring 17 is provided in the armature through hole 19 (used to keep the adjusting screw 24 in a tightened state at all times to improve its stability and prevent it from rotating automatically). The tension spring 17 is sleeved on the screw rod of the adjusting screw 24, and the outer diameter of the tension spring 17 is larger than the aperture of the stator through hole 20.

[0022] In order to prevent the nut of the adjusting screw 24 from getting stuck with the stator through hole 20, a gasket 23 (which may include a flat gasket and a spring gasket) is provided between the nut of the adjusting screw 24 and the stator convex ring 16, and the gasket 23 is mounted on the screw rod of the adjusting screw 24 through its own through hole.

[0023] In order to achieve a uniform and reliable pressing function for the armature 22, the number of the adjusting screw 24, the stator through hole 20, the armature through hole 19 and the movable block 14 are 2-4 and are evenly distributed along a virtual perfect circle.

[0024] Figure 3Also shown are the friction plates 18 arranged on both sides of the brake disc 21, the electromagnetic coil 25 and the return spring 26 arranged in the stator 27, and the rotor 28 connected to the brake disc 21 (the rotor 28 can be the rotating shaft of the motor, or it can be a sleeve connected to both the brake disc 21 and the rotating shaft of the motor, depending on the specific needs), which are all conventional structures in the prior art.

[0025] like Figure 3 As shown, during normal use, the movable block 14 can move freely within a certain range between the armature 22 and the cover plate 13, without affecting the normal braking function and normal braking release function of the electromagnetic brake; Figure 4 As shown, when the electromagnetic brake cannot be released from the braking state due to power failure or electromechanical failure, the nut of the adjusting screw 24 is driven to rotate by a wrench (not shown in the figure), so that the movable block 14 and the nut of the adjusting screw 24 gradually approach each other. When the gasket 23 is in close contact with the nut of the adjusting screw 24 and the stator convex ring 16 at the same time and the movable block 14 is in close contact with the armature 22, the adjusting screw 24 is continued to be rotated, and the movable block 14 will press the armature 22 to move it in the direction close to the stator 27, which is equivalent to realizing the function of the electromagnetic coil 25 being energized to generate electromagnetic attraction to make the armature 22 close to the stator 27, thereby realizing the manual release function, that is, the manual release of the brake function. Even if the relative positions of the cover 13, the armature 22 and the stator 27 change due to long-term use or external force during use, because under normal circumstances there is a clearance fit between the adjusting screw 24 and the stator 27 and the armature 22, and there is also a clearance fit between the movable block 14 and the armature 22 and the cover 13, the adjusting screw 24 can adaptively follow the position change and will not get stuck, and the manual release function can still be realized.

[0026] Note: The adjusting screw 24, gasket 23, cover plate 13, friction plate 18, brake disc 21, electromagnetic coil 25, armature 22, return compression spring 26, stator 27, rotor 28, and expansion compression spring 17 in the above specific implementation manner correspond one to one with the traditional adjusting screw 1, traditional gasket 2, traditional cover plate 3, traditional friction plate 4, traditional brake disc 5, traditional electromagnetic coil 6, traditional armature 7, traditional return compression spring 8, traditional stator 9, traditional rotor 10, and traditional expansion compression spring 12 in the background technology content, but because the structure has undergone innovative changes or adaptive changes, different marking numbers and component names are used.

[0027] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. An electromagnetic brake with an anti-stuck manual release function, comprising a stator, an armature, a brake disc and a cover plate, wherein the brake disc is located between the cover plate and the armature, and the armature is located between the brake disc and the stator, characterized in that: The electromagnetic brake with anti-jamming manual release function also includes a movable block and an adjusting screw. A stator convex ring protruding toward the outer circumferential direction is provided on the circumferential edge of one end of the stator close to the armature, a stator through hole is provided on the stator convex ring, an armature through hole is provided on the armature, and an adjusting screw hole is provided on the movable block. The movable block is placed between the armature and the cover plate, and the screw rods of the plurality of adjusting screws respectively pass through the corresponding plurality of stator through holes and the armature through holes and are connected to the adjusting screw holes on the plurality of movable blocks. The movable block can move between the armature and the cover plate in a direction parallel to the axial direction of the adjusting screw and cannot rotate in any direction.

2. The electromagnetic brake with anti-stuck manual release function according to claim 1, characterized in that: A positioning column protruding toward the armature is provided on one side edge of the movable block, and the positioning column is located outside the outer peripheral edge of the armature. The following conditions are met: during the axial movement of the movable block by the adjusting screw, the positioning column always has a section overlapping with the armature in the axial direction of the adjusting screw.

3. The electromagnetic brake with anti-stuck manual release function according to claim 1 or 2, characterized in that: An expansion spring is arranged in the armature through hole, and the expansion spring is sleeved on the screw rod of the adjusting screw. The outer diameter of the expansion spring is larger than the aperture of the stator through hole.

4. The electromagnetic brake with anti-stuck manual release function according to claim 1 or 2, characterized in that: A gasket is also arranged between the nut of the adjusting screw and the stator convex ring, and the gasket is sleeved on the screw rod of the adjusting screw through its through hole.

5. The electromagnetic brake with anti-jamming manual release function according to claim 1 or 2, characterized in that: The number of the adjusting screw, the stator through hole, the armature through hole and the movable block are 2-4 and are evenly distributed along a virtual perfect circle.

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