A hollow magnetic powder brake

Abstract

The utility model relates to the technical field of magnetic powder brake, especially a hollow type magnetic powder brake, including top magnetic yoke, bottom magnetic yoke and input shaft, the bottom magnetic yoke is connected with the top magnetic yoke bottom through bolt, the cavity between top magnetic yoke and bottom magnetic yoke is provided with coil, the top fastener of top magnetic yoke top connects top cover, the top cover top is connected with top bearing in the form of interference fit, through the design that the through -hole is set up in the central position of input shaft, the weight of brake whole body is reduced, when the brake works, through the through -hole of input shaft center, can make the wind of outside flow in the through -hole, enhance the heat emission of input shaft, reduced the higher heat that the brake long time operation produced, effectively improved the service life of brake.

Description

Technical Field

[0001] This utility model relates to the field of magnetic powder brake technology, and in particular to a hollow magnetic powder brake. Background Technology

[0002] A hollow shaft magnetic powder brake, also known as a hollow shaft magnetic powder brake, is a braking device that uses magnetic powder to transmit torque.

[0003] In the existing technology, traditional magnetic powder brakes mostly adopt a solid shaft structure, which has problems such as large size, high weight and low heat dissipation efficiency. Especially in the 5KG level torque control scenario, the solid design leads to complicated installation and increased maintenance costs. In addition, conventional brakes still have room for improvement in dynamic response and torque linearity, which affects the stability and energy efficiency of the equipment. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, a hollow magnetic powder brake is provided.

[0005] The specific technical solution is as follows: A hollow magnetic powder brake includes a top magnetic yoke, a bottom magnetic yoke, and an input shaft. The bottom of the top magnetic yoke is connected to the bottom magnetic yoke by bolts. A coil is disposed in the cavity between the top magnetic yoke and the bottom magnetic yoke. The top of the top magnetic yoke is fastened to a top cover. The top of the top cover is connected to a top bearing by an interference fit. The input shaft is disposed in the middle of the top bearing. A through hole is opened in the middle of the input shaft. The input shaft is connected to the bottom magnetic yoke and the interior of the bottom magnetic yoke by rotation.

[0006] Preferably, the bottom of the bottom magnetic yoke is provided with a bottom cover, the bottom cover is connected to the outer wall of the bottom magnetic yoke by fasteners, and magnetic powder is filled between the bottom magnetic yoke and the top magnetic yoke.

[0007] Preferably, the input shaft has a bottom bearing at the bottom, the outer wall of the bottom bearing is connected to the inner wall of the bottom cover in an interference fit, and the top and bottom of the input shaft are respectively provided with inner lip partitions.

[0008] Preferably, the inner wall of the bottom bearing is connected to the outer wall of the input shaft by an interference fit, and the inner wall of the top bearing is connected to the top outer wall of the input shaft by an interference fit.

[0009] Preferably, the outer walls at both ends of the input shaft are provided with slots, a retaining spring is engaged inside the top slot of the input shaft, the retaining spring is located at the top of the top bearing, and the retaining spring is also provided on the outer side of the bottom bearing.

[0010] The above technical solution has the following advantages or beneficial effects: 1. By setting an input shaft and a through hole, and by opening a through hole at the center of the input shaft, the overall weight of the brake is reduced. At the same time, when the brake is working, the external air can flow through the through hole at the center of the input shaft, which enhances the heat dissipation of the input shaft, reduces the high heat generated by the brake during long-term operation, and effectively improves the service life of the brake.

[0011] 2. By setting up a top yoke and a bottom yoke, when assembling the brake, the coil is placed in the gap after the top and bottom yokes are joined. Then, high-permeability magnetic powder is evenly distributed in the magnetic gap to ensure uniform magnetic field transmission, realize the linear relationship between excitation current and transmitted torque, improve control accuracy, control the magnetic flux to transmit torque through the excitation coil, eliminate mechanical contact, reduce vibration and noise, and demonstrate the practicality of this device. Attached Figure Description

[0012] Embodiments of the present invention will be described more fully with reference to the accompanying drawings. However, the accompanying drawings are for illustration and explanation only and do not constitute a limitation on the scope of the present invention.

[0013] Figure 1 This is a schematic diagram of the structure of a hollow magnetic powder brake proposed in this utility model; Figure 2 This is a cross-sectional view of a hollow magnetic powder brake proposed in this utility model; Figure 3 An exploded view of a hollow magnetic powder brake proposed in this utility model; Figure 4 This is a schematic diagram of the slot and retaining spring structure in a hollow magnetic powder brake proposed in this utility model.

[0014] The above-mentioned reference numerals indicate: 1. Top yoke; 2. Bottom yoke; 3. Input shaft; 4. Through hole; 5. Coil; 6. Top cover; 7. Bottom cover; 8. Inner lip spacer; 9. Slot; 10. Top bearing; 11. Snap ring; 12. Bottom bearing. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Example 1

[0018] Reference Figure 1-4 A hollow magnetic powder brake includes a top yoke 1, a bottom yoke 2, and an input shaft 3. The bottom of the top yoke 1 is bolted to the bottom of the bottom yoke 2. A coil 5 is installed in the cavity between the top yoke 1 and the bottom yoke 2. A top cover 6 is fastened to the top of the top yoke 1. The top cover 6 is connected to the top bearing 10 with an interference fit. The input shaft 3 is located in the middle of the top bearing 10. A through hole 4 is opened in the middle of the input shaft 3. The input shaft 3 is connected to the bottom yoke 2 and the interior of the bottom yoke 2 by rotation. By opening a through hole 4 in the center of the input shaft 3, the overall weight of the brake is reduced. At the same time, when the brake is working, the external air can flow through the through hole 4 in the center of the input shaft 3, which enhances the heat dissipation of the input shaft 3, reduces the high heat generated by the brake during long-term operation, and effectively improves the service life of the brake. Example 2

[0019] Furthermore, the bottom magnetic yoke 2 is provided with a bottom cover 7, which is connected to the outer wall of the bottom magnetic yoke 22 by fasteners. Magnetic powder is filled between the bottom magnetic yoke 2 and the top magnetic yoke 1. The bottom of the input shaft 3 is provided with a bottom bearing 12, and the outer wall of the bottom bearing 12 is connected to the inner wall of the bottom cover 7 in an interference fit. Inner lip spacers 8 are provided at the top and bottom of the input shaft 3 respectively.

[0020] The bottom yoke 2 and the top yoke 1, serving as the outer shell and structural foundation of the brake, are made of high-permeability magnetic material. They not only provide a robust working cavity but also construct an efficient, closed magnetic circuit channel, ensuring that the magnetic field generated by the coil 5 is utilized to the maximum extent and evenly passes through the magnetic powder in the working cavity. They also support and fix all other internal components, such as the coil 5 and bearings, forming a robust whole. The yoke and the coil 5 work together to form a closed magnetic circuit. When the coil 5 is energized, the yoke can efficiently guide the magnetic lines of force through the working cavity, magnetizing the magnetic powder and thus transmitting torque. The yoke is the foundation for a uniform and stable magnetic field. The coil 5, by receiving the magnitude of the external control signal current, generates a magnetic field of corresponding intensity. This is the physical basis for achieving stepless and precise torque control. The torque and the excitation current exhibit an excellent linear relationship, resulting in high control accuracy. Example 3

[0021] Furthermore, the inner wall of the bottom bearing 12 is connected to the outer wall of the input shaft 3 by an interference fit, and the inner wall of the top bearing 10 is connected to the top outer wall of the input shaft 3 by an interference fit. The outer walls at both ends of the input shaft 3 are provided with slots 9. A retaining spring 11 is engaged inside the top slot 9 of the input shaft 3. The retaining spring 11 is located at the top of the top bearing 10, and a retaining spring 11 is also provided on the outer side of the bottom bearing 12.

[0022] The hollow input shaft 3 is precisely supported by the bottom bearing 12 and top bearing 10 at both ends, ensuring its radial runout accuracy and rotational smoothness under high-speed operation, achieving low vibration, long service life and frictionless operation. The bearings can minimize rotational resistance, ensuring rapid brake response and smooth operation, and reducing unnecessary energy loss. By setting snap rings 11 on the outside of the bottom bearing 12 and top bearing 10, it is easy to limit and fix the bearings. By opening a through hole 4 in the middle of the input shaft 3, the installation can be simplified, allowing cables, air pipes, optical cables, etc. to pass directly through the center of the shaft, which greatly simplifies the equipment layout and is suitable for space-constrained automated equipment, such as packaging machinery, conveying systems and light industrial production lines.

[0023] Working principle: First, during the assembly of the brake, the coil 5 is placed in the gap between the top yoke 1 and the bottom yoke 2. Then, high-permeability magnetic powder is evenly distributed in the gap to ensure uniform magnetic field transmission, realize the linear relationship between excitation current and transmission torque, and improve control accuracy. The magnetic flux is controlled by the excitation coil 5 to transmit torque, eliminate mechanical contact, and reduce vibration and noise. The design of opening a through hole 4 in the center of the input shaft 3 reduces the overall weight of the brake. At the same time, when the brake is working, the external air can flow through the through hole 4 in the center of the input shaft 3, which enhances the heat dissipation of the input shaft 3, thus completing the operation.

[0024] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hollow magnetic powder brake, characterized in that: The device includes a top yoke (1), a bottom yoke (2), and an input shaft (3). The bottom of the top yoke (1) is connected to the bottom yoke (2) by bolts. A coil (5) is provided in the cavity between the top yoke (1) and the bottom yoke (2). The top of the top yoke (1) is fastened to a top cover (6). The top of the top cover (6) is connected to a top bearing (10) in an interference fit. The input shaft (3) is provided in the middle of the top bearing (10). A through hole (4) is provided in the middle of the input shaft (3). The input shaft (3) is connected to the bottom yoke (2) and the inside of the bottom yoke (2) by rotation.

2. The hollow magnetic powder brake according to claim 1, characterized in that: The bottom magnetic yoke (2) has a bottom cover (7) at the bottom. The bottom cover (7) is connected to the outer wall of the bottom magnetic yoke (2) by fasteners. Magnetic powder is filled between the bottom magnetic yoke (2) and the top magnetic yoke (1).

3. A hollow magnetic powder brake according to claim 1, characterized in that: The input shaft (3) is provided with a bottom bearing (12) at the bottom. The outer wall of the bottom bearing (12) is connected to the inner wall of the bottom cover (7) in an interference fit. The top and bottom of the input shaft (3) are respectively provided with inner lip partitions (8).

4. A hollow magnetic powder brake according to claim 3, characterized in that: The inner wall of the bottom bearing (12) is connected to the outer wall of the input shaft (3) in an interference fit, and the inner wall of the top bearing (10) is connected to the top outer wall of the input shaft (3) in an interference fit.

5. A hollow magnetic powder brake according to claim 3, characterized in that: The input shaft (3) has slots (9) on the outer walls at both ends. A retaining ring (11) is engaged inside the top slot (9) of the input shaft (3). The retaining ring (11) is located on the top of the top bearing (10). The retaining ring (11) is also provided on the outer side of the bottom bearing (12).

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