Power-off brake and its control method
The power-off brake, which combines a rotating electromagnet and a slider, solves the problems of large braking force and limited locking stroke in existing technologies, and achieves braking at any segment of the shaft. It is suitable for photoelectric turntables, has wide applicability, and is simple and reliable in structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHANGCHUN TONGSHI PHOTOELECTRIC TECH CO LTD
- Filing Date
- 2024-01-10
- Publication Date
- 2026-07-17
AI Technical Summary
Existing power failure brakes generate large axial forces during braking, and the armature shaft end locking stroke is limited, resulting in poor applicability.
It adopts a combination structure of rotating electromagnet, coupling, base, armature, slider, shaft stop, ball and limit block. By sliding the slider in the limit groove and guide groove, the shaft stop can be replaced and flexibly locked, avoiding axial force. It is suitable for photoelectric turntable braking.
It achieves braking at any segment of the shaft, has wide applicability, has no axial force during the locking process, has a simple and reliable structure, and the stroke can be changed as needed, solving the problems of large braking force and limited locking stroke in existing technologies.
Smart Images
Figure CN117847111B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of brake technology. Background Technology
[0002] DC torque motors are widely used in photoelectric turntables due to their high precision and stable torque. They transmit motion by being fixed to the shaft, but they lack self-locking capability and require an additional brake to be provided to the photoelectric turntable.
[0003] In existing technologies, power-off brakes are installed at the shaft end. When power is lost, the armature is ejected, and braking is achieved through the friction between the friction pads on the armature and the shaft end face. At this time, the braking force is directly proportional to the pressure between the armature and the shaft end face. When a large braking force is required, a large pressure needs to be applied to the shaft end, which seriously endangers the life of the photoelectric turntable. Existing motor power-off brakes are suitable for shaft end locking, and some existing technologies also use levers for braking, which requires applying axial force to the friction pads. However, this generates a large axial force, causing them to make close contact with the shaft end to achieve braking.
[0004] When the size of the shaft changes, the armature also needs to be enlarged to increase the friction area. In order to ensure the attraction of the electromagnet, the distance between the armature and the electromagnet in the power-off brake is very close, often only a few millimeters. This results in a limited travel of the locking device and inflexible installation. Cleaning or replacement is inconvenient when oil stains or friction plate chips appear.
[0005] Patent document CN117145890A discloses "a power-off brake for a rotating shaft system and its control method." This power-off brake is formed by interconnecting a shaft, brake, armature, electromagnet, and spring. The technical problem it solves is how to eliminate axial force. This power-off brake can brake at any segment of the shaft, allowing it to be installed at any point on the shaft. The stop shaft component is connected to multiple structures. However, the armature of this type of power-off brake is often integrally fitted to the entire structure, making it difficult to replace, or even impossible to replace with an armature of a different size; only the entire brake can be replaced, resulting in poor applicability. Existing motor power-off brakes are suitable for shaft end locking, requiring the application of axial force to the friction pads to ensure tight contact with the shaft end for braking. Summary of the Invention
[0006] This invention addresses the problems of existing power-off brakes, such as the large axial force generated during braking, limited locking stroke at the armature shaft end, and poor applicability. To solve these problems, this invention employs the following technical solution:
[0007] Option 1: Power failure brake, which includes a rotating electromagnet, a coupling, a base, an armature, multiple sliders, multiple shaft stoppers, multiple sets of balls, and multiple limit blocks;
[0008] The rotating electromagnet and the armature are located on both sides of the base. The rotating electromagnet is fixedly connected to the base and fixedly connected to the armature through a coupling.
[0009] The base has multiple limiting grooves on the side near the armature, and correspondingly, the armature has multiple guide grooves.
[0010] Each of the multiple sliders corresponds to one of the multiple stop shaft components;
[0011] Each guide groove has a slider embedded inside it. One end of the slider is inserted into the limiting groove, and the other end is fixedly connected to the stop shaft member. The slider can slide inside the guide groove and the limiting groove.
[0012] The limiting block is placed at one extreme position within the limiting groove.
[0013] A set of balls is embedded between the slider and the bottom of the limiting groove. When the slider and the limiting groove move relative to each other, the set of balls roll.
[0014] Furthermore, in a preferred embodiment, there are four limiting grooves and four guide grooves.
[0015] The limiting grooves are evenly arranged circumferentially with the center of the base as the center, and the four limiting grooves have a fan-shaped structure; the guide groove is long and narrow, and multiple guide grooves are radially distributed with the center of the base as the center; so that when multiple sliders move in the limiting grooves and guide grooves, they move simultaneously toward the center of the base or in the opposite direction.
[0016] Furthermore, a preferred embodiment is provided in which the armature, the rotating electromagnet, and the base are coaxially arranged.
[0017] Furthermore, a preferred embodiment is provided, wherein the upper part of the slider is a guide post, which is embedded in a guide groove, and the side of the guide post is a guide sliding surface, which slides in contact with the guide groove; the middle part of the slider is a disc flange, which is located between the armature and the base, and the upper part of the flange is a pre-tightening flange surface, which slides in contact with the armature; the bottom of the slider is a cylinder, the side wall of the cylinder is a helical rolling surface, which slides in connection with a limiting groove, and the bottom of the cylinder is a spherical recess, the inner surface of which is a ball rolling surface, which covers the balls.
[0018] Furthermore, a preferred embodiment is provided, wherein the upper part of the stop shaft member is an arc-shaped clamp, and the arc-shaped clamp is coaxial with the base.
[0019] Furthermore, in a preferred embodiment, the base is provided with a plurality of spare limiting slots, which are arranged alternately.
[0020] Furthermore, a preferred embodiment is provided in which the armature has a cross-shaped structure.
[0021] Option 2: A control method for a power-off brake, wherein the control method is implemented using the power-off brake described in any one of Options 1, and the method is as follows:
[0022] When the de-energized brake is locked, the rotating electromagnet is de-energized, the armature rotates in the forward direction, and drives the slider to move the stop shaft members toward the center of the base, so that multiple stop shaft members hold the rotating parts of the brake to be braked to achieve braking.
[0023] When the rotating electromagnet is energized, the armature rotates in the opposite direction, driving the slider to move the stop shaft away from the center of the base, thereby separating the stop shaft from the brake and ending the braking.
[0024] The advantages of this invention are:
[0025] This invention proposes a power-off brake. Existing power-off brakes generate large axial forces during braking and have limited locking stroke at the armature shaft end. This invention changes the locking radius and axial locking position by replacing the stop shaft component, achieving braking effect at any segment of the shaft. The stop shaft component is connected to the slider, resulting in a simple and reliable structure. The stroke can be changed as needed, and there is no axial force during locking. It has wide applicability and solves the problem of existing power-off brakes generating large axial forces during braking and having limited locking stroke at the armature shaft end, a technical problem that has been difficult to solve.
[0026] The power-off brake described in this invention is also applicable to the field of photoelectric turntable braking. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the power failure brake described in Embodiment 1.
[0028] Figure 2 This is an assembly diagram of the power failure brake described in Embodiment 1.
[0029] Figure 3 This is a top view of the power-off brake as described in Embodiment 1 when it reaches the locking limit position.
[0030] Figure 4 This is an assembly diagram of the power-off brake as described in Embodiment 1 when it reaches the release limit position.
[0031] Figure 5This is a schematic diagram of the power failure brake described in Embodiment 1.
[0032] Figure 6 This is a schematic diagram of the structure after the replacement of the stop shaft component in this invention.
[0033] Figure 7 This is a schematic diagram of the base of the power failure brake described in Embodiment 1.
[0034] Figure 8 This is a schematic diagram of the structure of the present invention when a spare guide groove is added to the base.
[0035] In the figure, there is a rotating electromagnet 1, a coupling 2, a base 3, a limiting groove 31, a limiting block screw hole 32, an electromagnet mounting hole 33, an armature 4, a guide groove 41, a slider 5, a guide sliding surface 51, a pre-tightening flange surface 52, a spiral rolling surface 53, a ball rolling surface 54, a shaft stop 6, a ball 7, and a limiting block 8. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.
[0037] Implementation Method 1: This implementation method provides a power failure brake, which includes a rotating electromagnet 1, a coupling 2, a base 3, an armature 4, multiple sliders 5, multiple shaft stoppers 6, multiple sets of balls 7, and multiple limit blocks 8.
[0038] The rotating electromagnet 1 and the armature 4 are located on both sides of the base 3. The rotating electromagnet 1 is fixedly connected to the base 3 and fixedly connected to the armature 4 through the coupling 2.
[0039] The base 3 is provided with a plurality of limiting grooves 31 on the side near the armature 4, and correspondingly, the armature 4 is provided with a plurality of guide grooves 41.
[0040] The plurality of sliders 5 correspond one-to-one with the plurality of stop shaft parts 6;
[0041] Each guide groove 41 has a slider 5 embedded inside. One end of the slider 5 is inserted into the limiting groove 31, and the other end is fixedly connected to the stop shaft 6. The slider 5 can slide inside the guide groove 41 and the limiting groove 31.
[0042] The limiting block 8 is placed at one extreme position within the limiting groove 31.
[0043] A set of balls 7 are embedded between the slider 5 and the bottom of the limiting groove 31. When the slider 5 and the limiting groove 31 move relative to each other, the set of balls 7 roll.
[0044] See Figures 1 to 8 The difference between the structure of the power failure brake described in this embodiment and the prior art is that the prior art uses a hollow structure, allowing the brake to be installed on any section of the shaft. The stop shaft component is connected to multiple structures, making replacement inconvenient. In contrast, this invention achieves braking effect on any section of the shaft by replacing the stop shaft component 6. The stop shaft component 6 is connected to the slider 5, resulting in a simple and reliable structure. The stroke can be changed as needed, there is no axial force during the locking process, making it widely applicable and easy to replace.
[0045] In this embodiment, the minimum distance between the guide groove 41 and the limiting groove 31 and the center of the base 3 is smaller than the radius of the locked shaft. When the rotating electromagnet 1 reaches the two extreme positions, the slider 5 is within the stroke of the limiting groove 31. Figure 6 The stop shaft component 6 described herein can be freely replaced to achieve the braking effect at any segment of the shaft, in order to adapt to different locking radii and different axial locking positions. Furthermore, the slider 5 is connected to the stop shaft component 6, making replacement convenient.
[0046] The stroke of the limiting block 8 described in this embodiment is variable, and the limiting block 8 can be freely replaced, determined by the length of the limiting block 8. When the stroke is short, the response speed is fast; when the stroke is long, it is convenient to install and replace the stop shaft component. The current limiting groove 31 is a spiral, and the stroke is the maximum radius of the spiral minus the minimum radius. The value is not unique and is specifically determined by the modeling value.
[0047] When the limiting block 8 is placed in the limiting groove 31 and away from the armature 4, the locking position is changed; when the limiting block 8 is placed in the limiting groove 31 and close to the armature 4, the releasing position is changed.
[0048] Implementation Method Two: This implementation method further defines the power-off brake described in Implementation Method One. The limiting groove 31 has four sections, and the guide groove 41 has four sections.
[0049] The limiting grooves 31 are evenly arranged circumferentially with the center of the base 3 as the center, and the four limiting grooves 31 have a fan-shaped structure; the guide grooves 41 are elongated, and multiple guide grooves 41 are radially distributed with the center of the base 3 as the center; so that when multiple sliders 5 move in the limiting grooves 31 and guide grooves 41, they simultaneously move towards the center of the base 3 or in the opposite direction.
[0050] The length of the limiting groove 31 described in this embodiment can be changed according to requirements. Alternatively, various limiting grooves 31 of different lengths can be machined on the base 3 for later use, or limiting blocks 8 of different lengths can be added to flexibly change the stroke.
[0051] Implementation Method 3: This implementation method is a further limitation of the power failure brake described in Implementation Method 1, wherein the armature 4, the rotating electromagnet 1, and the base 3 are coaxially arranged.
[0052] In this embodiment, by setting the armature 4 and the rotating electromagnet 1 coaxially, it is ensured that the armature 4 and the rotating electromagnet 1 move in the same direction.
[0053] Implementation Method 4: This implementation method further defines the power-off brake described in Implementation Method 1. The upper part of the slider 5 is a guide post, which is embedded in the guide groove 41. The side of the guide post is a guide sliding surface 51, which slides in contact with the guide groove 41. The middle part of the slider 5 is a disc flange, which is located between the armature 4 and the base 3. The upper part of the flange is a pre-tightening flange surface 52, which slides in contact with the armature 4. The bottom of the slider 5 is a cylinder, and the side wall of the cylinder is a helical rolling surface 53, which slides in connection with the limiting groove 31. The bottom of the cylinder is a spherical recess, and the inner surface of the spherical recess is a ball rolling surface 54, which covers the balls 7.
[0054] The slider 5 described in this embodiment includes a guide sliding surface 51, a pre-tightening flange surface 52, a spiral rolling surface 53, and a ball rolling surface 54.
[0055] The guide sliding surface 51 is slidably connected to the guide groove 41, the spiral rolling surface 53 is slidably connected to the limiting groove 31, and the ball rolling surface 54 is slidably connected to the ball 7.
[0056] In this embodiment, the guide sliding surface 51 is slidably connected to the guide groove 41 to ensure that the stop shaft 6 always faces the center, and the pre-tightening flange surface 52 is used to apply appropriate pre-tightening to the ball 7 to prevent it from seizing or loosening.
[0057] Implementation Method 5: This implementation method is a further limitation of the power failure brake described in Implementation Method 1. The upper part of the stop shaft member 6 is an arc-shaped clamp, and the arc-shaped clamp is coaxial with the base 3.
[0058] Implementation method six: This implementation method is a further limitation of the power failure brake described in implementation method one. The base 3 is also provided with a plurality of spare limit grooves, and the plurality of limit grooves and the plurality of spare limit grooves are arranged alternately.
[0059] Implementation Method Seven: This implementation method is a further limitation of the power failure brake described in Implementation Method One, wherein the armature 4 has a cross-shaped structure.
[0060] In practical applications, the structure of the armature 4 described in this embodiment is not unique.
[0061] Implementation Method Eight: This implementation method proposes a control method for a power-off brake. The control method is implemented using the power-off brake described in any one of Implementation Methods One to Seven. The method is as follows:
[0062] When the power-off brake is locked, the rotating electromagnet 1 is de-energized, the armature 4 rotates in the forward direction, and drives the slider 5 to move the stop shaft 6 toward the center of the base 3, so that multiple stop shafts 6 hold the rotating parts of the brake to be braked to achieve braking.
[0063] When the rotating electromagnet 1 is energized, the armature 4 rotates in the opposite direction, driving the slider 5 to move the stop shaft 6 away from the center of the base 3, thereby separating the stop shaft 6 from the brake and ending the braking.
[0064] See Figures 3 to 5 This embodiment addresses the technical problems existing in the prior art. When the power-off brake is locked, the de-energized rotating electromagnet 1 causes the coupling 2 and armature 4 to rotate by a certain angle, causing the slider 5 and ball bearing 7 to move a distance along the limiting groove 31 and guide groove 41 towards the center of the base 3 until the brake contacts the rotating shaft. When the rotating electromagnet 1 is energized, it causes the coupling 2 and armature 4 to rotate in the opposite direction by a certain angle, causing the slider 5 and ball bearing 7 to move a distance away from the center of the base 3 along the limiting groove 31 and guide groove 41, separating the brake from the rotating shaft and ending the braking. In other words, the control method of the power-off brake described in this embodiment effectively solves the technical problems existing in the prior art.
[0065] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the various embodiments and features of this disclosure can be combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations fall within the scope of this disclosure.
[0066] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.
Claims
1. A power-off brake, characterized in that, The power failure brake includes a rotating electromagnet (1), a coupling (2), a base (3), an armature (4), multiple sliders (5), multiple shaft stoppers (6), multiple sets of balls (7), and multiple limit blocks (8). The rotating electromagnet (1) and the armature (4) are located on both sides of the base (3). The rotating electromagnet (1) is fixedly connected to the base (3) and fixedly connected to the armature (4) through the coupling (2). The base (3) is provided with multiple limiting grooves (31) on the side near the armature (4), and correspondingly, the armature (4) is provided with multiple guide grooves (41). Each of the plurality of sliders (5) corresponds to one of the plurality of stop shaft parts (6); Each guide groove (41) has a slider (5) embedded inside. One end of the slider (5) is inserted into the limiting groove (31), and the other end is fixedly connected to the stop shaft member (6). The slider (5) can slide inside the guide groove (41) and the limiting groove (31). The limiting block (8) is placed at one extreme position within the limiting groove (31); A set of balls (7) are embedded between the slider (5) and the bottom of the limiting groove (31). When the slider (5) and the limiting groove (31) move relative to each other, the set of balls (7) roll. There are four limiting grooves (31) and four guide grooves (41). The limiting grooves (31) are evenly arranged circumferentially with the center of the base (3) as the center, and the four limiting grooves (31) are fan-shaped; the guide grooves (41) are long strips, and multiple guide grooves (41) are radially distributed with the center of the base (3) as the center; so that when multiple sliders (5) move in the limiting grooves (31) and guide grooves (41), they simultaneously move towards the center of the base (3) or move in the opposite direction.
2. The power-off brake according to claim 1, characterized in that, The armature (4), the rotating electromagnet (1), and the base (3) are arranged coaxially.
3. The power-off brake according to claim 1, characterized in that, The upper part of the slider (5) is a guide post, which is embedded in the guide groove (41). The side of the guide post is a guide sliding surface (51), which slides in contact with the guide groove (41). The middle part of the slider (5) is a disc flange, which is located between the armature (4) and the base (3). The upper part of the flange is a pre-tightening flange surface (52), which slides in contact with the armature (4). The bottom of the slider (5) is a cylinder, and the side wall of the cylinder is a spiral rolling surface (53). The spiral rolling surface (53) slides in connection with the limiting groove (31). The bottom of the cylinder is a spherical pit, and the inner surface of the spherical pit is a ball rolling surface (54), which covers the ball (7).
4. The power-off brake according to claim 1, characterized in that, The upper part of the stop shaft component (6) is an arc-shaped clamp, which is coaxial with the base (3).
5. The power-off brake according to claim 1, characterized in that, The base (3) is also provided with multiple spare limit slots, which are arranged alternately.
6. The power-off brake according to claim 1, characterized in that, The armature (4) has a cross-shaped structure.
7. A control method for a power failure brake, characterized in that, The control method is implemented using the power-off brake as described in any one of claims 1-6, and the method is as follows: When the de-energized brake is locked, the rotating electromagnet (1) is de-energized, the armature (4) rotates in the forward direction, and drives the slider (5) to move the stop shaft (6) toward the center of the base (3), so that multiple stop shafts (6) hold the rotating parts of the brake to be braked to achieve braking; When the rotating electromagnet (1) is energized, the armature (4) rotates in the opposite direction, driving the slider (5) to move the stop shaft (6) away from the center of the base (3), thereby separating the stop shaft (6) from the brake and ending the braking.