An electromagnetic power-off brake

Abstract

The present invention discloses a novel electromagnetic power-off brake, comprising: a fixed plate, the fixed plate comprising a first fixed plate and a second fixed plate, the first fixed plate being plate-shaped, and a rotating through hole being arranged at the center of the first fixed plate; a braking part, the braking part being arranged on the first fixed plate, the braking part comprising a braking member, the braking member being arranged in multiple sets, and the braking member being evenly distributed and arranged on the first fixed plate; the braking member comprising an iron core bracket, a coil, a restoring spring, a moving armature block and a friction plate, the iron core bracket and the moving armature block are both arranged on the first fixed plate, the coil and the restoring spring are both arranged on the iron core bracket, and the friction plate is arranged on the moving armature block. The present invention has a simple structure, a stable structure, a reasonable design, an easy installation, a safe use, a large braking force, an adjustable braking force, and does not affect the functions of other components during use.

Description

Technical Field

[0001] The present invention relates to the technical field of brakes, and more specifically, to an electromagnetic power-off brake. Background Art

[0002] The brake is a braking actuator in a motion system. When the motion system needs to brake or decelerate, it blocks the continued movement of the power shaft through an internal blocking mechanism or friction mechanism, thereby playing a braking function or safety protection function in the power system.

[0003] At present, in motion systems, especially those with servo motors as power sources, the braking device generally uses the motor shaft as the braking execution action. The most commonly used braking devices are mainly in two forms, namely: the claw-type brake device used in the driving joint position of some collaborative robots, the motor shaft and the claw move synchronously, when the power is on, the electromagnetic solenoid retracts the striker, releases the claw, and the motor shaft moves freely, when the power is off, the striker is released, the movement of the claw is blocked, and the motor shaft stops moving. The electromagnetic power-off brake used on ordinary servo motors is generally installed as an independent component at the tail of the motor, the motor shaft and the friction plate move synchronously, it releases the friction plate when the power is on, the motor can move freely, and when the power is off, the friction plate is pressed and the motor shaft is locked.

[0004] The claw brake device is structurally divided into two parts: the solenoid magnet and the claw. The claw is generally a disc-shaped four-claw or multi-claw structure, which is pressed against the shaft by a spring or a wave washer to stop the shaft from rotating. The solenoid is a stationary component installed parallel to the shaft. When the solenoid is energized, the internal striker is sucked back, and the claw disc can move freely with the shaft. When the solenoid loses power, the striker is reset by the spring and blocked in the claw movement line. The claw is blocked and stops moving, and the shaft also stops moving. The electromagnetic power-off brake is generally an independent component. The motor shaft passes through the base and cooperates with the friction plate. When power is turned on, the coil on the hollow base and the base form an E-shaped electromagnet, which attracts the circular hollow armature plate. The armature plate has a stroke toward the base side, thereby releasing the friction plate between the armature and the cover plate, and the motor shaft can move freely with the friction plate; when the coil loses power, the magnetic force disappears, and the armature is pushed away from the base by the compression spring distributed on the base, and together with the fixed cover plate, the friction plate is pressed, thereby locking the motor shaft.

[0005] The claw-type brake device needs to be arranged in a dispersed structure and cannot be used as an integral part. The installation is relatively complicated. Due to the special structure of the claw, the brake position cannot be stopped at any position, and the braking process is a blocking rigid collision. When the movement needs to be restored, the suction force of the solenoid itself is very small, and the claw cannot be easily separated from the impact rod, which adds great difficulty to the control of the brake. Although the electromagnetic power-off brake solves many problems of the claw-type brake device in terms of installation and use, due to its own structural distribution, the friction plate will inevitably come into contact with the upper and lower armatures and cover plates during free high-speed movement. Over time, the friction plate will wear. On the one hand, wear will cause the air gap between the armature and the iron core to become larger, affecting the suction effect and thus affecting the life of the brake. On the other hand, since the brake is generally installed adjacent to the motor encoder, the powder generated by wear will fall into the encoder, thereby affecting the normal operation of the encoder. Both of the above-mentioned brake devices cannot well solve the braking needs of the system currently using servo motors as power devices.

[0006] Therefore, designing an electromagnetic power-off brake with simple structure, stable structure, reasonable design, easy installation, safe use, large braking force, adjustable braking force and no impact on the functions of other components during use is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0007] In order to overcome the above defects, the present invention provides an electromagnetic power-off brake, which specifically adopts the following technical solutions:

[0008] An electromagnetic power-off brake, comprising:

[0009] The fixing plate comprises a first fixing plate and a second fixing plate, the first fixing plate is plate-shaped, and a rotation through hole is arranged at the center of the first fixing plate.

[0010] The braking part is arranged on the first fixed plate, and the braking part includes a braking member, and the braking member is provided with multiple sets, and the braking member is evenly distributed on the first fixed plate; the braking member includes an iron core bracket, a coil, a restoring spring, a movable armature block and a friction plate, the iron core bracket and the movable armature block are both arranged on the first fixed plate, the coil and the restoring spring are both arranged on the iron core bracket, and the friction plate is arranged on the movable armature block.

[0011] Preferably, the first fixed plate is provided with a plurality of fixed through holes, and screws are embedded in the fixed through holes; a plurality of guide blocks are evenly distributed and fixedly provided on one end surface of the first fixed plate, and the guide blocks are all arranged radially; the guide blocks are in the shape of long strips, and the length of the guide blocks is smaller than the radius of the first fixed plate.

[0012] Preferably, the core bracket is in the shape of an arc block, the central angle of the core bracket is not greater than 90 degrees, a plurality of screw holes are provided on both side surfaces of the core bracket, the core bracket is set on the first fixing plate through the screws, and the screw holes cooperate with the screws.

[0013] Preferably, a "return"-shaped groove is arranged on the chord surface of the core support, and a first spring groove is arranged at the four corners of the chord surface of the core support; the recovery spring is a compression spring, the outer diameter of the recovery spring is not greater than the diameter of the first spring groove, the length of the recovery spring is greater than the depth of the first spring groove, and one end of the recovery spring is embedded in the first spring groove.

[0014] Preferably, the coil is made of a conductive wire, and the coil is wound around a protrusion at the center of the “U”-shaped groove, so that the protrusion at the center of the “U”-shaped groove can serve as a coil core.

[0015] Preferably, the movable armature block is in the shape of a triangular block, the thickness of the movable armature block is not greater than the thickness of the core bracket, the angle at the top of the movable armature block is not greater than the central angle of the core bracket, and the height of the movable armature block is less than the chord-center distance of the core bracket; a rotating arc surface is provided at the top of the movable armature block, and the radius of the rotating arc surface is greater than the radius of the rotating through hole.

[0016] Preferably, a second spring groove is provided on the bottom surface of the movable armature block corresponding to the first spring groove, and the second spring groove is used to fit the other end of the restoring spring; the sum of the depths of the first spring and the second spring grooves is less than the natural length of the restoring spring.

[0017] Preferably, guide grooves are provided on both end faces of the movable armature block, and the width of the guide grooves is greater than the width of the guide block; the movable armature block is buckled on the guide block through the guide groove on one end face, so that the movable armature block can slide along the guide block.

[0018] Preferably, the friction plate is in the shape of an arc surface, the friction plate is embedded in the rotating arc surface, and the maximum sliding distance of the moving armature block is greater than the maximum gap between the friction plate and the rotating shaft.

[0019] Preferably, the second fixing plate structure is the same as the first fixing plate structure; the guide block on the second fixing plate is embedded in the guide groove on the other end face of the moving armature block, and the second fixing plate is set on the core bracket through the screws.

[0020] The present invention has at least the following beneficial effects:

[0021] 1) The electromagnetic power-off brake of the present invention has a simple structure, a stable structure, a reasonable design, is easy to install, safe to use, has a large braking force, an adjustable braking force, and does not affect the functions of other components during use;

[0022] 2) The electromagnetic power-off brake of the present invention is provided with a brake component, and the brake component is provided with multiple sets. The multiple sets of the brake components can selectively cut off the power of the coils of appropriate number and position as needed to control the braking speed of the motor shaft or adjust the motor shaft speed, thereby meeting the use requirements;

[0023] 3) The electromagnetic power-off brake of the present invention is provided with a brake component, which includes an iron core bracket, a coil, a restoring spring, a movable armature block and a friction plate. The height of the movable armature block is smaller than the chord center distance of the iron core bracket. When braking is not needed, the coil can attract the movable armature block to the side of the iron core bracket, so that the friction plate is completely separated from the rotating shaft to be braked, which can improve the service life of the brake and avoid the friction of the friction plate in the non-braking state. The friction generates dust that affects the functions of other components.

[0024] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the electromagnetic power-off brake of the present invention;

[0026] Figure 2 It is a bottom-up stereoscopic structural schematic diagram of the electromagnetic power-off brake of the present invention;

[0027] Figure 3 It is a bottom sectional view of the electromagnetic power-off brake of the present invention;

[0028] Figure 4 The electromagnetic power-off brake of the present invention Figure 3 Middle AA section view;

[0029] Figure 5 It is an exploded view of the electromagnetic power-off brake of the present invention.

[0030] Among them: 1-first fixed plate, 2-second fixed plate, 3-guide block, 4-rotation through hole, 5-fixed through hole, 6-screw, 7-core bracket, 8-coil, 9-restoring spring, 10-moving armature block, 11-friction plate, 12-screw hole, 13-"return" type groove, 14-rotation arc surface, 15-guide groove, 16-first spring groove, 17-second spring groove. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described in detail below by way of embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0032] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0033] according to Figure 1-Figure 5 As shown, an electromagnetic power-off brake comprises a fixing plate and a braking part, wherein the braking part is arranged on the fixing plate. The fixing plate comprises a first fixing plate 1 and a second fixing plate 2, wherein the braking part is arranged between the first fixing plate 1 and the second fixing plate 2, and the first fixing plate 1 and the second fixing plate 2 are symmetrically distributed at the upper and lower ends of the braking part.

[0034] The first fixing plate 1 and the second fixing plate 2 have the same structure, and the connection relationship with the braking part is also consistent. The structure of the first fixing plate 1 is taken as an example for explanation. The first fixing plate 1 is in the shape of a plate, and a rotating through hole 4 is provided at the center of the circle of the first fixing plate 1. The diameter of the rotating through hole 4 is larger than the diameter of the rotating shaft to be braked, and the rotating shaft to be braked passes through the rotating through hole 4. Eight fixed through holes 5 are provided at the edge of the first fixing plate 1, and screws 6 are embedded in the fixed through holes 5. The first fixing plate 1 fixes the braking part through the screws 6. Four guide blocks 3 are evenly distributed and fixedly provided on one end surface of the first fixing plate 1, and the guide blocks 3 are all arranged radially. The guide blocks 3 are in the shape of long strips, and the length of the guide blocks 3 is less than the radius of the first fixing plate 1.

[0035] The braking part includes a braking member, and the braking member is provided with four sets, and the braking member is evenly distributed on the first fixed plate 1. The braking member includes an iron core bracket 7, a coil 8, a restoring spring 9, a moving armature block 10 and a friction plate 11, and the iron core bracket 7 and the moving armature block 10 are both arranged on the first fixed plate 1, the coil 8 and the restoring spring 9 are both arranged on the iron core bracket 7, and the friction plate 11 is arranged on the moving armature block 10.

[0036] The core bracket 7 is in the shape of an arc block, the central angle of the core bracket 7 is not greater than 90 degrees, two screw holes 12 are arranged on both side surfaces of the core bracket 7, the core bracket 7 is arranged on the first fixing plate 1 through the screws 6, and the screw holes 12 cooperate with the screws 6.

[0037] A "return"-shaped groove 13 is provided at the center of the chord surface of the core support 7, and first spring grooves 16 are provided at the four corners of the chord surface of the core support 7. The first spring groove 16 is cylindrical. The restoring spring 9 is a compression spring, and the outer diameter of the restoring spring 9 is not greater than the diameter of the first spring groove 16. The length of the restoring spring 9 is greater than the depth of the first spring groove 16. One end of the restoring spring 9 is embedded in the first spring groove 16.

[0038] The coil 8 is made of a wire, and the coil 8 is wound on the protrusion at the center of the "return"-shaped groove 13, so that the protrusion at the center of the "return"-shaped groove 13 can act as the iron core of the coil 8, so as to improve the electromagnetic utilization of the coil 8, and further improve the efficiency of attracting the brake part. Specifically, the coil 8 is arranged in the "return"-shaped groove 13 through a potting process, that is, the coil 8 is embedded in the iron core bracket 7, and the structure of the iron core bracket 7 itself is used as the iron core of the coil 8, so that the electromagnetic coil structure is realized without occupying additional space.

[0039] The movable armature block 10 is in a triangular block shape, the thickness of the movable armature block 10 is not greater than the thickness of the core bracket 7, the angle at the top of the movable armature block 10 is not greater than the central angle of the core bracket 7, and the height of the movable armature block 10 is less than the chord-center distance of the core bracket 7. A rotating arc surface 14 is provided at the top of the movable armature block 10, and the radius of the rotating arc surface 14 is greater than the radius of the rotating through hole 4.

[0040] A second spring groove 17 is provided at the bottom surface of the movable armature block 10 corresponding to the first spring groove 16, and the second spring groove 17 is used to fit the other end of the restoring spring 9. The sum of the depths of the first spring and the second spring grooves 17 is less than the natural length of the restoring spring 9, and the restoring spring 9 is sandwiched between the core bracket 7 and the movable armature block 10.

[0041] The movable armature block 10 is provided with guide grooves 15 on both end faces, and the width of the guide grooves 15 is greater than the width of the guide block 3. The movable armature block 10 is buckled on the guide block 3 through the guide groove 15 on one end face, so that the movable armature block 10 can slide along the guide block 3.

[0042] The friction plate 11 is in the shape of an arc surface and is embedded in the rotating arc surface 14. The maximum sliding distance of the moving armature block 10 is greater than the maximum gap between the friction plate 11 and the rotating shaft, so that the friction plate 11 and the rotating shaft can contact and brake. When the coil 8 is energized to generate magnetic force, the moving armature block 10 will move along the guide block 3 toward the iron core bracket 7, so that the moving armature block 10 moves away from the center of the circle, and then the friction plate 11 is separated from the shaft to be braked, and the shaft rotates normally; when the coil 8 is de-energized, the moving armature block 10 will be acted upon by the thrust of the restoring spring 9 and will move away from the iron core bracket 7, so that the friction plate 11 is tightly pressed against the shaft to be braked, and then the shaft is braked. The four sets of independently operating electromagnetic coils simultaneously push the corresponding moving armature blocks 10 and friction plates 11 to move inward until they contact and brake the shaft to be braked. The four friction plates 11 contact the shaft to be braked, and the braking force is balanced on the outer periphery of the shaft, and the inner surface of the friction plate 11 fits the shaft body of the shaft to be braked. The braking area and braking force are large, which can achieve fast and reliable braking.

[0043] The structure of the second fixing plate 2 is completely the same as that of the first fixing plate 1. The guide block 3 on the second fixing plate 2 is embedded in the guide groove 15 on the other end surface of the moving armature block 10, and the second fixing plate 2 is set on the core bracket 7 through the screws 6.

[0044] As described above, the electromagnetic power-off brake of the present invention has a simple structure, a stable structure, a reasonable design, is easy to install, safe to use, has a large braking force, an adjustable braking force, and does not affect the functions of other components during use; at the same time, the electromagnetic power-off brake of the present invention is provided with a brake part, and the brake part is provided with multiple sets. The multiple sets of the brake parts can selectively cut off the power of coils of appropriate number and position as needed to control the braking speed of the motor shaft or adjust the speed of the motor shaft, thereby meeting the use requirements and not easy to get stuck; further, the electromagnetic power-off brake of the present invention is provided with a brake part, and the brake part includes an iron core bracket, a coil, a restoring spring, a moving armature block and a friction plate. The height of the moving armature block is less than the chord center distance of the iron core bracket. When braking is not required, the coil can attract the moving armature block to the side of the iron core bracket, so that the friction plate is completely separated from the shaft to be braked, which can improve the service life of the brake and avoid the friction of the friction plate in the non-braking state. The friction generates dust that affects the functions of other components.

[0045] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An electromagnetic power-off brake, characterized in that: include: A fixing plate, the fixing plate comprising a first fixing plate (1) and a second fixing plate (2) coaxially spaced apart, each fixing plate being in the shape of a circular plate, and a rotation through hole (4) being provided at the center of each fixing plate; A braking part, wherein the braking part is clamped between the first fixed plate (1) and the second fixed plate (2), and the braking part comprises a plurality of sets of braking parts, and the plurality of sets of braking parts are evenly distributed and arranged between the first fixed plate (1) and the second fixed plate (2); the braking part comprises an iron core bracket (7), a coil (8), a restoring spring (9), a movable armature block (10) and a friction plate (11); the iron core bracket (7) is fixed on the fixed plates at the upper and lower sides, the movable armature block (10) slides on the fixed plate inside the iron core bracket (7), the coil (8) is embedded on the chord surface of the iron core bracket (7), the restoring spring (9) is clamped between the iron core bracket (7) and the movable armature block (10), the friction plate (11) is arranged on the inner end of the movable armature block (10), and the rotating shaft passes through the rotating through hole (4) and is coaxially arranged in the inner peripheral space of each friction plate (11); A "return"-shaped groove (13) is provided on the chord surface of the core support (7), and first spring grooves (16) are provided at the four corners of the chord surface of the core support (7); the restoring spring (9) is a compression spring, the outer diameter of the restoring spring (9) is not greater than the diameter of the first spring groove (16), the length of the restoring spring (9) is greater than the depth of the first spring groove (16), and one end of the restoring spring (9) is embedded in the first spring groove (16); the coil (8) is composed of a conductive wire, and the coil (8) is wound around the center of the "return"-shaped groove (13). The protrusion is disposed on the center of the "return"-shaped groove (13), so that the protrusion at the center of the "return"-shaped groove (13) serves as the iron core of the coil (8); the movable armature block (10) is in a triangular block shape, the thickness of the movable armature block (10) is not greater than the thickness of the iron core bracket (7), the angle at the top of the movable armature block (10) is not greater than the center angle of the iron core bracket (7), and the height of the movable armature block (10) is less than the chord center distance of the iron core bracket (7); the top of the movable armature block (10) is provided with a rotating arc surface (14), and the radius of the rotating arc surface (14) is greater than the radius of the rotating through hole (4).

2. The electromagnetic power-off brake according to claim 1, characterized in that: The first fixing plate (1) is provided with a plurality of fixing through holes (5), and screws (6) are embedded in the fixing through holes (5); a plurality of guide blocks (3) are evenly distributed and fixedly provided on one end surface of the first fixing plate (1), and the guide blocks (3) are all arranged radially; the guide blocks (3) are in the shape of long strips, and the length of the guide blocks (3) is less than the radius of the first fixing plate (1).

3. The electromagnetic power-off brake according to claim 2, characterized in that: The core support (7) is in the shape of an arc block, the central angle of the core support (7) is not greater than 90 degrees, a plurality of screw holes (12) are arranged on both side surfaces of the core support (7), the core support (7) is arranged on the first fixing plate (1) by means of the screws (6), and the screw holes (12) cooperate with the screws (6).

4. The electromagnetic power-off brake according to claim 1, characterized in that: A second spring groove (17) is provided at a position on the bottom surface of the movable armature block (10) corresponding to the first spring groove (16), and the second spring groove (17) is used to fit the other end of the restoring spring (9); the sum of the depths of the first spring and the second spring grooves (17) is less than the natural length of the restoring spring (9).

5. The electromagnetic power-off brake according to claim 2 or 3, characterized in that: Guide grooves (15) are provided on both end faces of the movable armature block (10), and the width of the guide grooves (15) is greater than the width of the guide block (3); the movable armature block (10) is buckled on the guide block (3) through the guide groove (15) on one end face, so that the movable armature block (10) can slide along the guide block (3).

6. The electromagnetic power-off brake according to claim 5, characterized in that: The friction plate (11) is in the shape of an arc surface, and is embedded in the rotating arc surface (14). The maximum sliding distance of the moving armature block (10) is greater than the maximum gap between the friction plate (11) and the rotating shaft.

7. The electromagnetic power-off brake according to claim 5, characterized in that: The structure of the second fixed plate (2) is the same as that of the first fixed plate (1); the guide block (3) on the second fixed plate (2) is embedded in the guide groove (15) on the other end surface of the movable armature block (10), and the second fixed plate (2) is set on the iron core bracket (7) through the screws (6).

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