Servo brake system with protection function

Abstract

The utility model discloses a servo brake system with protection function, which relates to the technical field of mechanical arm joints and comprises a casing, a motor shaft, a flywheel, a first elastic part and a brake component are arranged in the casing, the first elastic part is arranged on the ring side of the motor shaft, the flywheel is sleeved on the ring side of the motor shaft, and the brake component is arranged on the flywheel. One end of the first elastic piece is connected with the motor shaft, the other end of the first elastic piece abuts against the end face of the flywheel, the elastic force acting direction of the first elastic piece is the axial direction of the flywheel, and the braking assembly is used for braking the flywheel; when the brake structure does work, the first elastic piece abuts against the end face of the flywheel, the flywheel rotates along with the motor shaft, during braking, the brake assembly enables the flywheel to brake, due to the friction force effect between the first elastic piece and the flywheel, the motor shaft is decelerated until the motor shaft stops rotating, the brake effect is achieved, and the brake structure does not make hard contact with the motor shaft, so that the protection effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical arm joints, in particular to a servo brake system with a protective function. Background Art

[0002] A robotic arm is an automated device that replaces humans in industrial production to complete certain monotonous, frequent, and repetitive long-term tasks. It performs monitoring, grasping, handling work or tool manipulation according to set procedures, trajectories and requirements.

[0003] At present, the servo motor brakes of the robot arm joint mainly use friction plate brakes, which use the electromagnetic attraction force of the electromagnetic coil to hold the brake friction plate, thereby braking the servo motor shaft. However, when the electromagnetic coil is energized, the friction plate brake will cause the servo motor shaft to stop rotating immediately, causing a hard impact on the reducer. Long-term use will damage the reducer.

[0004] In view of this, a servo brake system with protective function is urgently needed. Utility Model Content

[0005] In view of the problems existing in the prior art, the present invention solves the problem with the following technical structure.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A servo brake system with a protective function includes: a housing, a motor shaft, a flywheel, a first elastic member and a brake assembly are arranged in the housing, the first elastic member is arranged on the ring side of the motor shaft, the flywheel is sleeved on the ring side of the motor shaft, one end of the first elastic member is connected to the motor shaft, and the other end abuts against the end face of the flywheel, the elastic force of the first elastic member acts in the axial direction of the flywheel, and the brake assembly is used to brake the flywheel.

[0008] It is further characterized in that

[0009] The motor shaft is provided with a step mounting surface facing the flywheel in the circumferential direction, and the first elastic member is provided on the step mounting surface.

[0010] A retaining ring is sleeved on the motor shaft, and the flywheel and the first elastic member are arranged between the retaining ring and the step mounting surface.

[0011] The first elastic member is a wave spring.

[0012] A gasket is provided at the bottom of the wave spring or above the flywheel.

[0013] A plurality of the gaskets are provided, and the plurality of gaskets are stacked in sequence.

[0014] The brake assembly includes a brake pin, a second elastic member and an electromagnet. The brake pin and the electromagnet are both arranged in a housing. The housing is provided with a slide groove below the flywheel. The brake pin is slidably arranged in the slide groove. The electromagnet is arranged above the flywheel and the brake pin. The second elastic member is arranged at the bottom of the brake pin.

[0015] The flywheel is in the shape of a ratchet.

[0016] The second elastic member is a compression spring.

[0017] A mounting bracket is provided in the casing, and the electromagnet is provided on the mounting bracket.

[0018] The above structure of the utility model can achieve the following beneficial effects:

[0019] When working, the first elastic member contacts the end face of the flywheel, and the flywheel rotates with the motor shaft. When braking, the brake assembly brakes the flywheel. Due to the friction between the first elastic member and the flywheel, the motor shaft slows down until it stops rotating, thereby playing a braking role. The brake structure does not make hard contact with the motor shaft, and plays a protective role. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic cross-sectional view of the structure of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the flywheel in this application.

[0022] In the figure: 1. Casing; 2. Motor shaft; 21. Stepped mounting surface; 22. Retaining ring; 3. Flywheel; 4. Wave spring; 5. Gasket; 6. Brake pin; 7. Electromagnet; 8. Compression spring; 9. Mounting bracket. DETAILED DESCRIPTION

[0023] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or equipment.

[0025] The following is combined with Figure 1-Figure 2 This application is described in further detail.

[0026] refer to Figure 1 As shown, a servo brake system with a protective function includes: a casing 1, a motor shaft 2, a flywheel 3, a first elastic member and a brake assembly are arranged in the casing 1, the first elastic member is arranged on the ring side of the motor shaft 2, and the flywheel 3 is sleeved on the ring side of the motor shaft 2, one end of the first elastic member is connected to the motor shaft 2, and the other end is in contact with the end face of the flywheel 3, and the elastic force of the first elastic member acts in the axial direction of the flywheel 3. The brake assembly is used to brake the flywheel 3. In this way, when working, since the first elastic member is in contact with the end face of the flywheel 3, the flywheel 3 rotates with the motor shaft 2. During braking, the brake assembly brakes the flywheel 3. Due to the friction between the first elastic member and the flywheel 3, the motor shaft 2 is decelerated until it stops rotating, thereby playing a braking role. The brake structure does not have hard contact with the motor shaft 2, thereby playing a protective role.

[0027] refer to Figure 1 As shown, the specific installation structure of the first elastic member and the flywheel 3 includes: a step mounting surface 21 is arranged in the circumferential direction of the motor shaft 2 facing the flywheel 3, the first elastic member is arranged on the step mounting surface 21, a retaining ring 22 is sleeved on the motor shaft 2, and the flywheel 3 and the first elastic member are arranged between the retaining ring 22 and the step mounting surface 21. In this way, the flywheel 3 and the first elastic member are clamped on the motor shaft through the step mounting surface 21 and the retaining ring 22.

[0028] refer to Figure 1 As shown, the first elastic member can be a wave spring 4, which contacts the bottom surface of the flywheel 3 through the wave spring 4, so that when the motor shaft 2 rotates, the flywheel 3 rotates due to the friction between the wave spring 4 and the retaining ring 22. When the flywheel 3 brakes, the friction force is converted into a braking force for braking the motor shaft 2, and in order to adjust the braking force (friction between the wave spring 4 and the flywheel 3), a gasket 5 is provided at the bottom of the wave spring 4 or above the flywheel 3. The number of gaskets 5 is set according to demand, and multiple gaskets 5 can be set, and multiple gaskets 5 are stacked in sequence. In this way, by adding gaskets 5, the elastic compression force of the wave spring 4 is increased, thereby increasing the friction force. Conversely, the elastic compression force of the wave spring 4 is reduced, thereby reducing the friction force.

[0029] refer to Figure 1As shown, the brake assembly includes a brake pin 6, a second elastic member and an electromagnet 7. The brake pin 6 and the electromagnet 7 are both arranged in the housing 1. The housing 1 is provided with a slide groove below the flywheel 3. The brake pin 6 is slidably arranged in the slide groove. The electromagnet 7 is arranged above the flywheel 3 and the brake pin 6. The second elastic member is arranged at the bottom of the brake pin 6. The second elastic member is preferably a compression spring 8. In this way, when the electromagnet 7 is energized, the brake pin 6 is pushed down by the electromagnetic force. At this time The brake flywheel 3 can rotate together with the motor shaft 2; in an emergency, when an emergency stop is required or the robot arm is shut down, the electromagnet 7 is powered off, the electromagnetic force disappears, and the brake pin 6 is pushed upward under the action of the second elastic member, thereby blocking the brake flywheel 3 and stopping the flywheel 3. Due to the friction between the brake flywheel 3, the wave spring 4 and the motor shaft 2, the motor shaft 2 stops rotating as the brake flywheel 3 stops rotating, playing a braking role. In order to facilitate the brake pin 6 to block the flywheel 3, as shown in FIG. Figure 2 As shown, the flywheel 3 is configured as a ratchet.

[0030] A further optimization is that, in order to improve the stability of the installation of the electromagnet 7 , a mounting bracket 9 is provided in the housing 1 , and the electromagnet 7 is provided on the mounting bracket 9 .

[0031] The working principle of the utility model is as follows: when working, the first elastic member contacts the end face of the flywheel 3, and the flywheel 3 rotates with the motor shaft 2. When braking, the brake assembly brakes the flywheel 3. Due to the friction between the first elastic member and the flywheel 3, the motor shaft 2 is decelerated until it stops rotating, thereby playing a braking role. The brake structure does not make hard contact with the motor shaft 2, thereby playing a protective role.

[0032] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the scope of protection of the present invention.

Claims

1. A servo brake system with protective function, characterized in that: include: A housing (1) is provided with a motor shaft (2), a flywheel (3), a first elastic member and a brake assembly, wherein the first elastic member is provided on the ring side of the motor shaft (2), the flywheel (3) is sleeved on the ring side of the motor shaft (2), one end of the first elastic member is connected to the motor shaft (2), and the other end abuts against the end face of the flywheel (3), the elastic force of the first elastic member acts in the axial direction of the flywheel (3), and the brake assembly is used to brake the flywheel (3).

2. A protective servo brake system according to claim 1, characterized in that: The motor shaft (2) is provided with a stepped mounting surface (21) facing the flywheel (3) in the circumferential direction, and the first elastic member is provided on the stepped mounting surface (21).

3. The protective servo brake system according to claim 2, characterized in that: A retaining ring (22) is sleeved on the motor shaft (2), and the flywheel (3) and the first elastic member are arranged between the retaining ring (22) and the step mounting surface (21).

4. The protective servo brake system according to claim 2, characterized in that: The first elastic member is a wave spring (4).

5. The protective servo brake system according to claim 4, characterized in that: A gasket (5) is provided at the bottom of the wave spring (4) or above the flywheel (3).

6. The protective servo brake system according to claim 5, characterized in that: A plurality of the gaskets (5) are provided, and the plurality of gaskets (5) are stacked in sequence.

7. The protective servo brake system according to claim 1, characterized in that: The brake assembly includes a brake pin (6), a second elastic member and an electromagnet (7), wherein the brake pin (6) and the electromagnet (7) are both arranged in a housing (1), and the housing (1) is provided with a slide groove below the flywheel (3), the brake pin (6) is slidably arranged in the slide groove, the electromagnet (7) is arranged above the flywheel (3) and the brake pin (6), and the second elastic member is arranged at the bottom of the brake pin (6).

8. The protective servo brake system according to claim 7, characterized in that: The flywheel (3) is in the shape of a ratchet.

9. The protective servo brake system according to claim 7, characterized in that: The second elastic member is a compression spring (8).

10. The protective servo brake system according to claim 7, characterized in that: A mounting bracket (9) is provided in the housing (1), and the electromagnet (7) is provided on the mounting bracket (9).

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