Power-off brake

Abstract

A power-off brake comprises an armature seat, a base, a plurality of fixing rods, an armature plate, a brake pad, a gasket, at least one spring, and a release group. The armature seat and the base are arranged at intervals. The plurality of fixing rods connect the armature seat and the base. The armature plate is located between the armature seat and the base. The brake pad is located between the armature plate and the base. The gasket is located between the base and the brake pad. The at least one spring pushes the armature plate toward the brake pad. The release group comprises two ejection blocks and a handle. Each ejection block is rotatably connected to the base and has a cam portion. The opposite ends of the handle are respectively fixed to the two ejection blocks, and drive each ejection block to rotate relative to the base, thereby pushing the armature plate away from the brake pad.

Description

Technical Field

[0001] The present invention relates to a braking device, and more particularly to a power-off brake for braking when power is off. Background Art

[0002] The existing power-off brake is mainly arranged on the rotating shaft of the speed changer or motor, and includes a base, an armature seat, an armature plate, a brake plate, and at least one spring. The base and the armature seat are arranged in an axial direction, the armature plate is arranged between the base and the armature seat, and the brake plate is located between the armature plate and the base. The at least one spring is arranged between the armature seat and the armature plate and pushes the armature plate toward the base. When the armature seat is energized, a magnetic force is generated to attract the armature plate, causing the armature plate to move away from the brake plate, allowing the brake plate to move. When the armature seat is not energized, the at least one spring pushes the armature plate against the brake plate, fixing the brake plate, and braking the motor or speed changer.

[0003] However, when the existing power-off brake is not powered, the armature plate will press against the fixed brake pad to brake the transmission or motor. It is difficult to release the brake state when the existing power-off brake is not powered. To repair the transmission or motor, the armature seat needs to be energized to release the brake pad and release the brake state, which is dangerous for personnel during maintenance.

[0004] In addition, since the base is mainly a die-cast part, such as a cast iron part, the surface is relatively uneven. When the brake pad rubs against the base, it is easy to produce abnormal noise and easily slip during braking, which needs to be improved. Summary of the Invention

[0005] In view of this, the main purpose of the present invention is to provide a power-off brake, which can be manually released when the power is off, so that personnel can still repair the machine when the power is off, thereby improving safety.

[0006] In order to achieve the above-mentioned object, the power-off brake of the present invention comprises:

[0007] an armature seat;

[0008] a base, the base being spaced apart from the armature base, and having two connecting portions convexly arranged at an angular interval on a side of the base facing the armature base;

[0009] A plurality of fixing rods connecting the armature seat and the base;

[0010] an armature plate, the armature plate being located between the base and the armature seat;

[0011] a brake shoe located between the base and the armature plate;

[0012] a gasket located between the base and the brake pad;

[0013] At least one spring is disposed between the armature seat and the armature plate and pushes the armature plate toward the brake pad; and

[0014] A release group is connected to the base, and the release group includes two push-up blocks and a handle. The two push-up blocks are respectively connected to two connecting parts of the base and can be rotated relative to the base. Each push-up block has a rotating shaft and a cam portion. The cam portion is located between the armature plate and the base. The cam portion has an abutting top and a retracted portion. The abutting top has a flat surface. The straight-line distance from the flat surface of the abutting top to the rotating shaft is greater than the straight-line distance from the retracted portion to the rotating shaft. The opposite ends of the handle are respectively fixed to the two push-up blocks, and drive each push-up block to rotate relative to the base with the rotating shaft as the center, so that the abutting tops of the cam portions of the two push-up blocks push the armature plate away from the brake pad.

[0015] By utilizing the above technical features, the power-off brake of the present invention has the following efficiency gains:

[0016] 1. When the armature seat is not powered, the release assembly can still be used to move the armature plate away from the brake pad, thereby releasing the brake state. This allows personnel to repair the machine in the unpowered state, improving machine maintenance safety.

[0017] 2. Since the gasket is provided between the base and the brake pad, the abnormal noise generated by the direct friction of the brake pad against the base can be reduced, thereby preventing slipping during braking and increasing the braking torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional appearance diagram of a preferred embodiment of the present invention.

[0019] Figure 2 It is a three-dimensional exploded view of a preferred embodiment of the present invention.

[0020] Figure 3 It is a side view of a preferred embodiment of the present invention.

[0021] Figure 4 It is a partial cross-sectional side view of a preferred embodiment of the present invention.

[0022] Figure 5 This is a three-dimensional exploded view of the release group of a preferred embodiment of the present invention.

[0023] Figure 6 This is a three-dimensional appearance diagram of the ejection block according to a preferred embodiment of the present invention.

[0024] Figure 7This is a partial cross-sectional action diagram of a preferred embodiment of the present invention, showing the braking state.

[0025] Figure 8 FIG1 is a partial cross-sectional action diagram of a preferred embodiment of the present invention, showing that the release assembly drives the armature plate away from the brake pad. DETAILED DESCRIPTION

[0026] Please refer to Figures 1 to 4 A preferred embodiment of the power-off brake of the present invention includes an armature seat 10, a base 20, a plurality of fixing rods 30, an armature plate 15, a brake pad 40, a washer 45, at least one spring 35, and a release group 50.

[0027] The armature base 10 is provided with a coil therein and can generate magnetic force when energized. The armature base 10 can be provided with a multi-phase coil body, which includes multiple coils and can be connected in different ways to make the armature base 10 suitable for different voltages, such as 380V AC power supply or 220V AC power supply.

[0028] The base 20 is arranged at intervals with the armature seat 10. The base 20 is provided with two connecting portions 23 arranged at intervals at an angle on one side of the base 20 facing the armature seat 10. The two connecting portions 23 are adjacent to the periphery of the base 20 and are located on the radially opposite sides of the base 20. The plurality of fixing rods 30 connect the armature seat 10 and the base 20. Each fixing rod 30 can be a screw and supported between the base 20 and the armature seat 10. Preferably, the armature seat 10 can be connected along the plurality of fixing rods 30. The fixed rod 30 is movably connected to the plurality of fixed rods 30 so as to adjust the relative distance between the armature seat 10 and the base 20. Each fixed rod 30 is threadedly connected to two nuts 32 located on opposite sides of the armature seat 10, and the two nuts 32 can be rotated to adjust the position of the two nuts 32 relative to the fixed rod 30, thereby adjusting the position of the armature seat 10 relative to the fixed rod 30, and thereby adjusting the relative distance between the armature seat 10 and the base 20.

[0029] The armature plate 15 is located between the base 20 and the armature seat 10. The multiple fixing rods 30 pass through the armature plate 15 to guide the armature plate 15. The brake pad 40 is located between the base 20 and the armature plate 15. The gasket 45 is located between the base 20 and the brake pad 40. The at least one spring 35 is located between the armature seat 10 and the armature plate 15 and pushes the armature plate 15 toward the brake pad 40. The power-off brake can be provided with multiple such springs 35, each of which is respectively mounted on the multiple fixing rods 30 and located between the armature seat 10 and the armature plate 15.

[0030] When the armature base 10 is energized, a magnetic force is generated, which attracts the armature plate 15 to move toward the armature base 10, compressing the multiple springs 35 and releasing the brake pad 40. When the armature base 10 is not energized, the multiple springs 35 push the armature plate 15 toward the brake pad 40, causing the armature plate 15 to press against the brake pad 40, and the brake pad 40 is clamped and fixed between the base 20 and the armature plate 15. Since the gasket 45 is provided between the base 20 and the brake pad 40, and the surface of the gasket 45 is smoother than the surface of the base 20, it can reduce the abnormal noise generated by the brake pad 40 directly rubbing against the base 20, prevent the brake pad 40 from slipping when fixed, and increase the braking torque. The gasket 45 is fixed to the base 20 and can be a metal sheet, preferably stainless steel, such as SUS303 stainless steel.

[0031] Please refer to Figures 2 to 6 The release assembly 50 is connected to the base 20 and includes two ejection blocks 51 and a handle 55. The two ejection blocks 51 are respectively connected to the two connecting portions 23 of the base 20 and can rotate relative to the base 20. The opposite ends of the handle 55 are respectively fixed to the two ejection blocks 51.

[0032] Please refer to Figures 4 to 6 Each ejection block 51 has a rotation axis A and a cam portion 513. The cam portion 513 is located between the armature piece 15 and the base 20. The cam portion 513 has a top portion 515 and a retracted portion 514. The top portion 515 has a plane. The straight-line distance from the plane of the top portion 515 to the rotation axis A is greater than the straight-line distance from the retracted portion 514 to the rotation axis A. Please refer to Figure 7 and Figure 8 The handle 55 drives each ejection block 51 to rotate relative to the base 20 about the rotation axis A, so that the contacting top portion 515 of the cam portion 513 of the two ejection blocks 51 pushes the armature plate 15 away from the brake pad 40, thereby releasing the brake pad 40 and releasing the braking state.

[0033] Please refer to Figures 4 to 6 Each ejection block 51 further includes a sleeve portion 511 and a head portion 517. The sleeve portion 511 is formed at one end of the cam portion 513. The sleeve portion 511 penetrates into its corresponding connecting portion 23, and the cam portion 513 extends out of its corresponding connecting portion 23. The head portion 517 is formed at one end of the sleeve portion 511 away from the cam portion 513, and the outer diameter of the head portion 517 is larger than the outer diameter of the sleeve portion 511 and is located on the outside of its corresponding connecting portion 23. The handle 55 is fixed to the head portion 517.

[0034] Please refer to Figure 4 and Figure 7The vertical distance between the retracted portion 514 of the cam portion 513 of each ejection block 51 and the rotation axis A is less than or equal to the vertical distance between the top surface of the brake shoe 40 and the rotation axis A. When the armature seat 10 is not energized and the retracted portion 514 of the cam portion 513 of each ejection block 51 is facing the armature plate 15, the armature plate 15 is pushed by the multiple springs 35 and compresses the brake shoe 40.

[0035] Please refer to Figure 4 and Figure 8 The vertical distance between the abutting top portion 515 of the cam portion 513 of each ejection block 51 and the rotation axis A is greater than the vertical distance between the top surface of the brake pad 40 and the rotation axis A. When the armature seat 10 is not energized and the abutting top portion 515 of the cam portion 513 of each ejection block 51 is facing the armature plate 15, the armature plate 15 is pushed away from the brake pad 40 by the abutting top portion 515, thereby releasing the brake pad 40 and releasing the braking state.

[0036] Therefore, the user can simply pull the handle 55 to drive the two ejection blocks 51 to rotate relative to the base 20. When the power is off, the cam portions 513 of the two ejection blocks 51 push the armature plate 15 away from the brake pad 40 to release the brake state. The machine can be repaired when the power is off, thereby improving maintenance safety.

[0037] In addition, the gasket 45 is provided between the base 20 and the brake pad 40 to reduce the abnormal noise generated by the brake pad 40 directly rubbing against the base 20, thereby preventing slipping during braking and increasing the braking torque.

[0038] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A power-off brake comprising: an armature seat; a base, the base being spaced apart from the armature base, and having two connecting portions convexly arranged at an angular interval on a side of the base facing the armature base; A plurality of fixing rods connecting the armature seat and the base; an armature plate, the armature plate being located between the base and the armature seat; a brake pad located between the base and the armature plate; and At least one spring is disposed between the armature seat and the armature plate and pushes the armature plate toward the brake pad; characterized in that, The power-off brake also includes a gasket located between the base and the brake pad; and A release group is connected to the base, and the release group includes two push blocks and a handle. The two push blocks are respectively connected to the two connecting parts of the base rotatably relative to the base. Each push block has a rotating shaft and a cam portion. The cam portion is located between the armature plate and the base. The cam portion has an abutting top and a retracted portion. The abutting top has a flat surface. The straight-line distance between the flat surface of the abutting top and the rotating shaft is greater than the straight-line distance between the retracted portion and the rotating shaft. The opposite ends of the handle are respectively fixed to the two push blocks, and drive each push block to rotate relative to the base with the rotating shaft as the center, so that the abutting tops of the cam portions of the two push blocks push the armature plate away from the brake pad.

2. The power-off brake according to claim 1, wherein: The gasket is a metal sheet.

3. The power-off brake according to claim 1, wherein: The gasket is a stainless steel sheet.

4. The power-off brake according to any one of claims 1 to 3, characterized in that: The two connecting portions of the base are adjacent to the periphery of the base and are located at radially opposite sides of the base.

5. The power-off brake according to claim 4, wherein: Each ejection block includes a sleeve portion and a head portion. The sleeve portion is formed at one end of the cam portion. The sleeve portion penetrates into its corresponding connecting portion. The cam portion extends out of its corresponding connecting portion. The head portion is located at an end of the sleeve portion away from the cam portion and is located outside the connecting portion. The handle is connected to the head portion.

6. The power-off brake according to claim 1, wherein: The power-off brake is further provided with a plurality of springs, which are respectively sleeved on the plurality of fixing rods and located between the armature seat and the armature sheet.

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