A large torque electromagnetic brake

Abstract

The utility model relates to brake technology field provides a kind of big torque electromagnetic brake, including two parallelly arranged and fixedly connected flanges;Two flanges between slidingly being provided with two parallelly arranged and adsorbing surface opposite stator, the adsorbing surface of stator and adjacent flange between slidingly being provided with moving plate and outside rotor, and outside rotor is located between moving plate and flange, stator is equipped with pressure spring between moving plate;Two stators between slidingly being provided with intermediate rotor.The utility model compares with the brake of existing double-end brake mode of increasing braking torque, under the premise that without increasing radial dimension, also without selecting higher strength spring, increase friction surface, provide greater braking torque.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and more specifically, to a high-torque electromagnetic brake. Background Technology

[0002] In industrial transmission systems, automated equipment, and lifting and transport machinery, brakes are core safety components whose performance directly affects the stability and reliability of equipment operation. Currently, brakes on the market are mainly divided into electromagnetic, hydraulic, and pneumatic types. Among them, electromagnetic power-off brakes are widely used in scenarios requiring emergency braking or power failure protection due to their rapid response and convenient control.

[0003] To increase braking torque, some electromagnetic brakes currently employ a structure with one stator (two coils) or two stators stacked together to achieve braking from both ends, thus doubling the braking torque. However, under special operating conditions such as heavy-duty equipment and high-speed transmission, the increased braking torque provided by existing dual-end braking brakes is still insufficient to meet the requirements. Increasing the braking torque of dual-end braking brakes typically involves increasing the friction surface area or increasing the normal force. However, the former leads to a larger radial dimension of the brake, making it unsuitable for applications with strict radial installation space constraints; the latter requires the use of high-strength springs and wear-resistant materials, which not only increases manufacturing costs but may also reduce the unlocking sensitivity of the braking system. Utility Model Content

[0004] The purpose of this invention is to provide a high-torque electromagnetic brake to overcome the aforementioned deficiencies in the prior art.

[0005] This utility model is achieved through the following technical solution: A high-torque electromagnetic brake includes two flanges arranged in parallel and fixedly connected; two stators arranged in parallel with opposite adsorption surfaces are slidably disposed between the two flanges; a moving plate and an outer rotor are slidably disposed between the adsorption surface of the stator and the adjacent flange, and the outer rotor is located between the moving plate and the flange; a pressure spring is provided between the stator and the moving plate; and an intermediate rotor is slidably disposed between the two stators.

[0006] Optionally, an intermediate return spring is provided between the two stators, and an outer return spring is provided between the moving plate and the flange. The preload of both the intermediate return spring and the outer return spring is less than the preload of the pressure spring.

[0007] Optionally, the two flanges are connected by connecting screws, and the connecting screws are fitted with positioning sleeves for limiting the distance between the two flanges. The intermediate return spring and the outer return spring are both fitted on the positioning sleeves.

[0008] Optionally, the moving plate is provided with a guide hole that mates with the positioning sleeve.

[0009] Optionally, the positioning sleeve is provided with a limiting plate between the two stators, and two intermediate return springs are provided, which are separated by the limiting plate.

[0010] Optionally, a dustproof sleeve is provided between the two flanges.

[0011] Optionally, the inner side of the dustproof cylinder is provided with a limiting ring located between the moving plate and the stator adsorption surface, and the moving plate and / or the stator are provided with a clearance opening to avoid the limiting ring.

[0012] Optionally, the outer edge of the flange is provided with a positioning step for installing a dustproof cylinder.

[0013] The technical solution of this utility model has at least the following advantages and beneficial effects: In this utility model, two stators are slidably disposed between two flanges. Between the two stators and the flanges, there are not only moving plates and outer rotors, but also an intermediate rotor between the two stators. When power is off, under the action of the pressure spring, the moving plate and the corresponding stator move away from each other (while the two stators move closer to each other), causing the moving plate to press against the outer rotor, and simultaneously the two stators press against the intermediate rotor, thereby achieving braking. When power is on, the stators attract the corresponding moving plates, allowing both the outer rotor and the intermediate rotor to have axial movement clearance, thereby releasing the brake. Compared with the existing double-end braking brakes that increase braking torque, this invention increases the friction surface and provides greater braking torque without increasing the radial dimension or using higher-strength springs. Attached Figure Description

[0014] Figure 1 A schematic diagram of a high-torque electromagnetic brake provided by this utility model; Figure 2 for Figure 1 Enlarged view of point A in the image; Figure 3 This is a schematic diagram of the dustproof cylinder. Figure 4 This is a schematic diagram of the positioning sleeve. Reference numerals: 1-Flange, 2-Stator, 201-Magnetic yoke, 202-Coil, 3-Moving plate, 4-Outer rotor, 5-Intermediate rotor, 6-Compression spring, 7-Intermediate return spring, 8-Outer return spring, 9-Positioning sleeve, 901-Limiting plate, 10-Connecting screw, 11-Dustproof sleeve, 1101-Limiting ring, 12-Mounting screw, 13-Shaft sleeve. Detailed Implementation

[0015] refer to Figure 1A high-torque electromagnetic brake includes two flanges 1, two stators 2, two moving plates 3, two outer rotors 4, an intermediate rotor 5, and a pressure spring 6. The two flanges 1 are arranged side-by-side and fixedly connected. In practical applications, one flange 1 is connected to a mounting surface by mounting screws 12. The two stators 2 are arranged and slidably disposed between the two flanges 1, with their adsorption surfaces facing away from each other. A moving plate 3 and an outer rotor 4 are slidably disposed between the adsorption surface of each stator 2 and the adjacent flange 1, with the outer rotor 4 located between the moving plate 3 and the flange 1. The intermediate rotor 5 is slidably disposed between the two stators 2. The pressure spring 6 is disposed between the stators 2 and the moving plates 3. A blind mounting hole is provided on the stator 2, and the pressure spring 6 is installed in the blind mounting hole, with one end abutting against the bottom of the blind mounting hole and the other end abutting against the moving plate 3.

[0016] It should be understood that the aforementioned "sliding configuration" means that axial movement is possible, that is, the stator 2, the moving plate 3, the outer rotor 4, and the middle rotor 5 can all move axially. Meanwhile, those skilled in the art should understand that the stator 2 is typically composed of a magnetic yoke 201 and a coil 202 (hereinafter, unless otherwise specified, "stator 2" refers to the magnetic yoke 201). One end of the magnetic yoke 201 has an annular groove, and the coil 202 is disposed within the annular groove. The end face of the magnetic yoke 201 with the annular groove serves as its adsorption surface. When the coil 202 is energized, a magnetic circuit is formed between the magnetic yoke 201 and the moving plate 3, causing the magnetic yoke 201 to attract the moving plate 3.

[0017] In practical applications, when power is off, under the action of the pressure spring 6, the moving plate 3 and the corresponding stator 2 move away from each other (while the two stators 2 move closer to each other), causing the moving plate 3 to press against the outer rotor 4, while the two stators 2 press against the middle rotor 5, thus achieving braking. When power is on, the stator 2 attracts the corresponding moving plate 3, allowing both the outer rotor 4 and the middle rotor 5 to have axial movement clearance, thus releasing the brake. Compared with the existing double-end braking brakes that increase braking torque, this method increases the friction surface and provides greater braking torque without increasing the radial dimension or using a higher strength spring.

[0018] refer to Figure 2 An intermediate return spring 7 is provided between the two stators 2, and an outer return spring 8 is provided between the moving plate 3 and the flange 1. When the brake is released, the intermediate return spring 7 can maintain the gap between the two stators 2, and the outer return spring 8 can maintain the gap between the moving plate 3 and the adjacent flange 1, effectively preventing the stators 2 and the moving plate 3 from axially moving and contacting the rotor to generate friction after they are engaged. In practical applications, the preload of the intermediate return spring 7 and the outer return spring 8 is much smaller than the preload of the pressure spring 6 to avoid affecting normal braking.

[0019] Refer again Figure 1In this embodiment, a dustproof sleeve 11 is provided between the two flanges 1. In practical applications, the dustproof sleeve 11 is pressed between the two flanges 1. Furthermore, the outer edge of the flange 1 is provided with a positioning step for installing the dustproof sleeve 11, which facilitates better radial positioning of the dustproof sleeve 11. A sealing ring can be provided on the contact surface between the dustproof sleeve 11 and the flange 1 to improve the sealing performance.

[0020] In this embodiment, the two flanges 1 are connected by connecting screws 10. A positioning sleeve 9 is fitted onto the connecting screws 10, with each end of the positioning sleeve 9 abutting against one flange 1, thereby limiting the distance between the two flanges 1. Furthermore, the moving plate 3 has guide holes that mate with the positioning sleeve 9, enabling radial positioning of the moving plate 3 while the positioning sleeve 9 also serves as a guide for axial movement of the moving plate 3. Simultaneously, the intermediate return spring 7 and the outer return spring 8 are both fitted onto the positioning sleeve 9.

[0021] refer to Figures 2-4 Based on the positioning sleeve 9, a limiting plate 901 is provided on the positioning sleeve 9 between the two stators 2, and two intermediate return springs 7 are provided, which are separated by the limiting plate 901. Further, based on the dustproof cylinder 11, a limiting ring 1101 is provided on the inner side of the dustproof cylinder 11 between the adsorption surface of the moving plate 3 and the stator 2. The moving plate 3 is provided with a clearance opening to avoid affecting the mutual adsorption between the stator 2 and the moving plate 3. In other embodiments, the clearance opening can also be provided on the stator 2, or clearance openings can be provided on both the moving plate 3 and the stator 2.

[0022] It is worth noting that without the limit plate 901 and the limit ring 1101, the force of the middle return spring 7 acts on one end of the stator 2 and moving plate 3 assembly structure, while the force of the outer return spring 8 acts on the other end. This can easily lead to uneven force distribution or even tilting of parts due to the difference in the magnitude of the spring forces on both sides of the stator 2 and moving plate 3 assembly structure. The limit plate 901 and the limit ring 1101 work together to effectively limit the extreme positions of the moving plate 3 and the stator 2, thus solving this problem well.

[0023] Refer again Figure 1Furthermore, in practical applications, friction plates are provided on both sides of the intermediate rotor 5 and both sides of the two outer rotors 4 to improve friction and ensure braking torque. The friction plates are preferably fixed by adhesive bonding. The inner walls of the intermediate rotor 5 and the outer rotors 4 are connected by a bushing 13 via splines; that is, the inner wall of the rotor and the outer wall of the bushing 13 are provided with mating spline teeth. It is easy to understand that the intermediate rotor 5 and the two outer rotors 4 can each be connected to a bushing 13, or they can share a common bushing 13. The inner wall of the bushing 13 is provided with a keyway for connecting the power shaft, so that the bushing 13 is connected to the power shaft (not shown) via a flat key. When the brake is unlocked, the power shaft can drive the bushing 13, the outer rotors 4, and the intermediate rotor 5 to rotate together.

[0024] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-torque electromagnetic brake, characterized in that, It includes two flanges arranged side by side and fixedly connected; two stators arranged side by side with their adsorption surfaces facing away are slidably arranged between the two flanges; a moving plate and an outer rotor are slidably arranged between the adsorption surface of the stator and the adjacent flange, and the outer rotor is located between the moving plate and the flange; a pressure spring is provided between the stator and the moving plate; and an intermediate rotor is slidably arranged between the two stators.

2. The high-torque electromagnetic brake according to claim 1, characterized in that, An intermediate return spring is provided between the two stators, and an outer return spring is provided between the moving plate and the flange. The preload of both the intermediate return spring and the outer return spring is less than the preload of the pressure spring.

3. The high-torque electromagnetic brake according to claim 2, characterized in that, The two flanges are connected by connecting screws, and the connecting screws are fitted with positioning sleeves to limit the distance between the two flanges. The intermediate return spring and the outer return spring are both fitted on the positioning sleeves.

4. The high-torque electromagnetic brake according to claim 3, characterized in that, The moving plate is provided with a guide hole that mates with the positioning sleeve.

5. The high-torque electromagnetic brake according to claim 3, characterized in that, The positioning sleeve has a limiting plate between the two stators, and there are two intermediate return springs, which are separated by the limiting plate.

6. The high-torque electromagnetic brake according to claim 5, characterized in that, A dustproof sleeve is provided between the two flanges.

7. The high-torque electromagnetic brake according to claim 6, characterized in that, The dustproof cylinder has a limiting ring located between the moving plate and the stator adsorption surface on its inner side, and the moving plate and / or the stator has a clearance opening to avoid the limiting ring.

8. The high-torque electromagnetic brake according to claim 6, characterized in that, The flange has a positioning step on its outer edge for installing a dustproof sleeve.

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