Brake with guide structure

Abstract

The utility model discloses a brake with a guide structure, which belongs to the technical field of braking, and comprises an electromagnetic part, a brake part and a base, the guide structure comprises a first guide part and a second guide part, the first end of the second guide part sequentially penetrates through the electromagnetic part, the first guide part and the brake part and is mounted on the base, and the second end of the second guide part is mounted on the base. The second end of the second guide piece abuts against the first guide piece. The first end of the first guide piece is in clearance fit with the first end of the electromagnetic part; the second end of the first guide piece is in threaded fit with the second end of the electromagnetic part; in the first direction, the brake part is in sliding fit with the first end of the first guide piece; the first end of the first guide part has a certain adjusting gap, even if the brake part and the first end of the first guide part are misplaced during installation, the position relation between the first guide part and the second guide part is adjusted through the clearance fit of the first guide part and the electromagnetic part, the flexibility between the brake part and the first guide part is improved, and the brake effect is improved. The mounting precision of the brake part is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of brakes, in particular to a brake with a guide structure. Background Art

[0002] The brakes of the traction machine include plate brakes and disc brakes. Both plate brakes and disc brakes include a brake unit, an electromagnetic unit, a machine base, and a guide. The guide is fixed on the machine base, and the electromagnetic unit and the adjustment sleeve are sleeved outside the guide. The electromagnetic unit and the brake unit cooperate with each other to drive the brake unit to move on the guide and complete the braking action. Moreover, the guide generally has two functions, one of which is used to guide the movement of the brake unit, and the other is used to adjust the position of the electromagnetic unit, thereby adjusting the moving travel distance of the brake unit.

[0003] However, in terms of production technology, it is necessary to drill holes on the brake part and the electromagnetic part. The number of holes on the brake part corresponds to the number of holes on the electromagnetic part. The electromagnetic part has threaded holes and the brake part has through holes. After the guide part is threadedly matched with the electromagnetic part, the guide part cannot be adjusted inside the electromagnetic part. Therefore, the matching accuracy of the brake part and the guide part is required to be high. When there are a large number of through holes in the brake part, the threaded holes of the electromagnetic part and the through holes of the brake part are prone to misalignment, resulting in the inability to install the guide part, or the brake part interferes with the guide part when sliding, causing the brake part to jam when moving, seriously affecting the stability of the brake. Utility Model Content

[0004] The utility model aims to improve the brake part to avoid interference with the guide member when the brake part moves, and to reduce the installation accuracy of the brake part, thereby providing a brake with a guide structure.

[0005] The technical solutions to achieve the above objectives include the following:

[0006] A brake with a guide structure includes an electromagnetic part, a brake part, and a machine base. The guide structure includes a first guide member and a second guide member. The first end of the second guide member passes through the electromagnetic part, the first guide member, and the brake part in sequence and is installed on the machine base. The second end of the second guide member abuts against the first guide member. The first end of the first guide member is clearance-matched with the first end of the electromagnetic part, and the second end of the first guide member is threadedly matched with the second end of the electromagnetic part. In a first direction, the brake part is slidingly matched with the first end of the first guide member.

[0007] In one embodiment, the first guide member includes a guide sleeve and an adjustment sleeve, and the guide sleeve and the adjustment sleeve are both sleeved on the outside of the second guide member and slidably cooperate with the second guide member; at least part of the guide sleeve is located in the electromagnetic part and has a gap between the electromagnetic part, and at least part of the adjustment sleeve is located in the electromagnetic part and is threadedly cooperated with the electromagnetic part.

[0008] In one embodiment, the brake part has a guide hole, the guide sleeve has a first adjustment hole, the electromagnetic part has a second adjustment hole, the inner wall of the second adjustment hole has an internal thread, and the outer wall of the adjustment sleeve has an external thread; in a first direction, at least part of the guide hole, the first adjustment hole and the second adjustment hole overlap, and the guide hole, the first adjustment hole and the second adjustment hole are all for the first end of the second guide member to pass through.

[0009] In one of the embodiments, the first end of the guide sleeve is located in the second adjustment hole, and the second end of the guide sleeve is located in the guide hole; the first end and the second end of the guide sleeve are respectively matched with the electromagnetic part and the brake part in a clearance, and a first gap is formed between the first end of the guide sleeve and the electromagnetic part, and a second gap is formed between the second end of the guide sleeve and the brake part.

[0010] In one embodiment, the first end of the guide sleeve abuts against the first end of the adjustment sleeve, the second end of the adjustment sleeve abuts against the second end of the second guide member, and the second end of the guide sleeve abuts against the machine base.

[0011] In one embodiment, the second guide member includes a column cap and a guide column, the outer diameter of the column cap is larger than the outer diameter of the guide column, the first end of the guide column passes through the second adjustment hole, the first adjustment hole and the guide hole in sequence, and is threadedly connected to the machine base, the second end of the guide column is fixed to the column cap, and the column cap is against the adjustment sleeve.

[0012] In one embodiment, the guide structure further comprises a sliding bearing, which is mounted on the brake part and sleeved on the outside of the guide sleeve. The brake part is slidably matched with the guide sleeve via the sliding bearing.

[0013] In one embodiment, a brake wheel is provided on the machine base, and the brake part cooperates with the brake wheel. The brake part has a first moving position and a second moving position. In the first moving position, the brake part is against the brake wheel; in the second moving position, the brake part is away from the brake wheel.

[0014] In one embodiment, the electromagnetic part has a coil, the coil is used to connect to a power source, the brake part has a first adsorption surface, the electromagnetic part has a second adsorption surface, the first adsorption surface is used to magnetically cooperate with the second adsorption surface so that the brake part has a first moving position and a second moving position.

[0015] In one embodiment, the brake further comprises a return spring, wherein a first end of the return spring is mounted on the first adsorption surface, and a second end of the return spring is mounted on the second adsorption surface.

[0016] The technical solution provided by the utility model has the following advantages and effects:

[0017] The second guide member is passed through the electromagnetic part, the first guide member and the brake part in sequence and installed on the machine base. After being energized, the electromagnetic part generates a magnetic field, thereby adsorbing the brake part to move in the first direction. During the movement of the brake part, the brake part and the first guide member are slidably matched, and the second guide member is abutted against the first guide member, thereby limiting the movement of the first guide member in the first direction, so that the first guide member is on a track in a stationary state. The second end of the first guide member is threadedly matched with the second end of the electromagnetic part, and the second end of the first guide member is used to adjust the position of the electromagnetic part on the first guide member, thereby adjusting the moving stroke of the brake part on the first guide member; the first end of the first guide member is gap-matched with the first end of the electromagnetic part, so that the first end of the first guide member has a certain adjustment gap. Even if the brake part is misaligned when installed with the first end of the first guide member, the positional relationship between the brake part and the first guide member and the second guide member can be adjusted through the gap match between the first guide member and the electromagnetic part, so that the brake part and the first guide member always maintain a sliding match, thereby reducing the matching accuracy between the brake part and the second guide member; since there is a gap between the first end of the first guide member and the electromagnetic part, the position of the first guide member can be adjusted on the second guide member, thereby avoiding interference between the brake part and the first guide member. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings herein show specific examples of the technical solutions described in the present utility model, and together with the specific implementation methods constitute a part of the specification, and are used to explain the technical solutions, principles and effects of the present utility model.

[0019] Unless otherwise specified or defined, the same reference numerals in different drawings represent the same or similar technical features, and the same or similar technical features may also be represented by different reference numerals.

[0020] Figure 1 It is a schematic diagram of the partial cooperation between the guide structure and the brake in one embodiment of the utility model;

[0021] Figure 2In one embodiment of the utility model Figure 1 Schematic diagram of the cross section at AA;

[0022] Figure 3 In one embodiment of the utility model Figure 1 Schematic diagram of the cross section at BB;

[0023] Figure 4 This is a schematic diagram of the structure of a brake in one embodiment of the utility model;

[0024] Figure 5 is a side view of the electromagnetic part in one embodiment of the utility model;

[0025] Description of reference numerals:

[0026] 100. Brake; 1. Machine base; 2. Braking part; 21. Guide hole; 22. First adsorption surface; 3. Guide structure; 30. First guide member; 31. Adjustment sleeve; 32. Second guide member; 321. Column cap; 322. Guide column; 33. Guide bushing; 331. First adjustment hole; 301. First gap; 302. Second gap; 34. Sliding bearing; 4. Electromagnetic part; 41. Second adjustment hole; 42. Coil; 43. Second adsorption surface; 5. Reset spring; 6. Brake wheel. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0028] Unless otherwise specified or defined, the "first, second..." used in this article is merely used to distinguish names and does not represent a specific quantity or order.

[0029] Unless specifically stated or defined otherwise, the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] It should be noted that when a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there can be a central component; when an component is considered to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time; when an component is considered to be "installed on" another component, it can be directly installed on the other component or there can be a central component at the same time. When an component is considered to be "set on" another component, it can be directly set on the other component or there can be a central component at the same time.

[0031] like Figures 1 to 5As shown, a brake 100 with a guide structure 3 includes an electromagnetic part 4, a brake part 2, and a base 1. The guide structure 3 includes a first guide member 30 and a second guide member 32. The first end of the second guide member 32 passes through the electromagnetic part 4, the first guide member 30, and the brake part 2 in sequence and is installed on the base 1. The second end of the second guide member 32 abuts against the first guide member 30; the first end of the first guide member 30 is gap-fitted with the first end of the electromagnetic part 4, and the second end of the first guide member 30 is threadedly fitted with the second end of the electromagnetic part 4; in the first direction, the brake part 2 is slidably fitted with the first end of the first guide member 30. In this embodiment, the first direction is the length direction of the first guide member 30. The second guide member 32 is passed through the electromagnetic part 4, the first guide member 30 and the brake part 2 in sequence and installed on the base 1. After the electromagnetic part 4 is energized, it generates a magnetic field, thereby adsorbing the brake part 2 to move in the first direction. During the movement of the brake part 2, the brake part 2 and the first guide member 30 produce a sliding fit, and the second guide member 32 is abutted against the first guide member 30, thereby limiting the movement of the first guide member 30 in the first direction, so that the first guide member 30 is on a stationary track, thereby realizing the braking action of the brake part 2.

[0032] The second end of the first guide member 30 is threadedly matched with the second end of the electromagnetic part 4, and the second end of the first guide member 30 is used to adjust the position of the electromagnetic part 4 on the first guide member 30, thereby adjusting the moving stroke of the brake part 2 on the first guide member 30; the first end of the first guide member 30 is gap-matched with the first end of the electromagnetic part 4, so that the first end of the first guide member 30 has a certain adjustment gap. Even if the brake part 2 is misaligned when installed with the first end of the first guide member 30, the positional relationship between the first guide member 30 and the second guide member 32 can be adjusted through the gap match between the first guide member 30 and the electromagnetic part 4, so that the brake part 2 and the first guide member 30 always maintain a sliding match, thereby reducing the matching accuracy between the first guide member 30 and the second guide member 32; since there is a gap between the first end of the first guide member 30 and the electromagnetic part 4, the position of the first guide member 30 can be adjusted on the second guide member 32, thereby avoiding interference between the brake part 2 and the first guide member 30.

[0033] In order to further reduce the matching accuracy between the brake part 2 and the second guide member 32. Figures 1 to 3As shown, the first guide member 30 includes a guide sleeve 33 and an adjustment sleeve 31, and the guide sleeve 33 and the adjustment sleeve 31 are both sleeved on the outside of the second guide member 32 and are both slidably matched with the second guide member 32; at least part of the guide sleeve 33 is located in the electromagnetic part 4, and there is a gap between the guide sleeve 33 and the electromagnetic part 4, and at least part of the adjustment sleeve 31 is located in the electromagnetic part 4 and is threadedly matched with the electromagnetic part 4. By arranging the adjustment sleeve 31 and the guide sleeve 33, the first guide member 30 has a segmented structure, the adjustment sleeve 31 and the guide sleeve 33 are respectively located on both sides of the electromagnetic part 4, the guide sleeve 33 is used to be gap-matched with the first end of the electromagnetic part 4, and the adjustment sleeve 31 is used to be threadedly matched with the second end of the electromagnetic part 4. During installation, firstly, the brake part 2 is sleeved on the outside of the guide sleeve 33, and the guide sleeve 33 is installed on the outside of the second guide member 32; then the electromagnetic part 4 is sleeved on the adjusting sleeve 31, and the electromagnetic part 4 is sleeved on the outside of the guide sleeve 33. The end of the guide sleeve 33 close to the electromagnetic part 4 is clearance-matched with the electromagnetic part 4. The guide sleeve 33 has an adjustment margin on the second guide member 32. The guide sleeve 33 is adjusted on the second guide member 32, thereby reducing the matching accuracy between the brake part 2 and the guide sleeve 33, and avoiding interference when the brake part 2 moves on the guide sleeve 33.

[0034] In this implementation, if Figure 5 As shown, the brake 100 has at least two second guide members 32, and the two second guide members 32 cooperate with each other to limit the rotation of the electromagnetic part 4. When adjusting the moving stroke of the brake part 2, the adjusting sleeve 31 is rotated to drive the electromagnetic part 4 to move in the first direction, and the electromagnetic part 4 moves toward the brake part 2. When the electromagnetic part 4 moves to a preset position, the adjusting sleeve 31 is stopped from rotating, and the electromagnetic part 4 is fixed by the adjusting sleeve 31, and the total moving stroke distance of the brake part 2 is shortened; the electromagnetic part 4 moves away from the brake part 2, and the total moving stroke distance of the brake part 2 is increased.

[0035] In order to realize the movement of the electromagnetic part 4 and the brake part 2. Figures 1 to 3As shown, the brake part 2 has a guide hole 21, the first guide member 30 has a first adjustment hole 331, the electromagnetic part 4 has a second adjustment hole 41, the inner wall of the second adjustment hole 41 has an internal thread, and the outer wall of the adjustment sleeve 31 has an external thread; in the first direction, the guide hole 21, the first adjustment hole 331 and the second adjustment hole 41 at least partially overlap, and the guide hole 21, the first adjustment hole 331 and the second adjustment hole 41 are all for the first end of the second guide member 32 to pass through. By opening the guide hole 21 in the brake part 2, the guide hole 21 is passed through by the guide sleeve 33, so that the brake part 2 slides outside the guide sleeve 33, and the brake part 2 moves in the first direction, and the brake part 2 completes the braking action after the movement. By setting an internal thread on the inner wall of the second adjustment hole 41, the adjustment sleeve 31 has an external thread, and the internal thread matches the external thread, and the adjustment sleeve 31 rotates to move the electromagnetic part 4. The adjusting sleeve 31 and the guide sleeve 33 cooperate with the second adjusting hole 41 respectively, so that the first guide member 30 has the function of guiding the movement of the brake part 2 and adjusting the total movement stroke of the brake part 2. The second adjusting hole 41 also enables the guide sleeve 33 to have a certain adjustment deviation in the electromagnetic part 4, and the second adjusting hole 41 of the electromagnetic part 4 provides the guide sleeve 33 with a margin for adaptively adjusting the displacement.

[0036] like Figures 1 to 3 As shown, the first end of the guide sleeve 33 is located in the second adjustment hole 41, and the second end of the guide sleeve 33 is located in the guide hole 21; the first end and the second end of the guide sleeve 33 are respectively matched with the electromagnetic part 4 and the brake part 2, and a first gap 301 is formed between the first end of the guide sleeve 33 and the electromagnetic part 4, and a second gap 302 is formed between the second end of the guide sleeve 33 and the brake part 2. Figure 2 It can be seen that the first gap 301 is used for the guide sleeve 33 to move and adjust in the electromagnetic part 4, and moves according to the processing error between the brake part 2 and the second guide member 32. Generally, the first gap 301 is larger than the positioning error of the brake part 2 on the second guide member 32. The second gap 302 is used to maintain a certain gap between the brake part 2 and the guide sleeve 33, so that when the brake part 2 moves in the first direction, the brake part 2 and the guide sleeve 33 are prevented from interfering with each other, and the interference phenomenon includes wear, bending, and action jamming.

[0037] In order to improve the stability of the movement of the brake part 2. Figure 1As shown, the first end of the second guide member 32 is threadedly engaged with the machine base 1, the first end of the guide sleeve 33 is abutted against the first end of the adjustment sleeve 31, the second end of the adjustment sleeve 31 is abutted against the second end of the second guide member 32, and the second end of the guide sleeve 33 is abutted against the machine base 1. After the adjustment sleeve 31 adjusts the electromagnetic part 4, there is a gap between the adjustment sleeve 31 and the second guide member 32. The second guide member 32 is threadedly engaged with the machine base 1, and the second guide member 32 rotates toward the machine base 1, thereby eliminating the gap, and making the second guide member 32, the adjustment sleeve 31, the guide sleeve 33, and the machine base 1 contact and abut against each other in the first direction in sequence. When the electromagnetic part 4 is engaged with the brake part 2, the brake part 2 moves in the first direction, and the guide sleeve 33 cannot move in the first direction, thereby improving the stability of the movement of the brake part 2.

[0038] like Figure 1 As shown, the second guide member 32 includes a column cap 321 and a guide column 322. The outer diameter of the column cap 321 is larger than the outer diameter of the guide column 322. The first end of the guide column 322 passes through the second adjustment hole 41, the first adjustment hole 331 and the guide hole 21 in sequence, and is threadedly connected to the base 1. The second end of the guide column 322 is fixed to the column cap 321, and the column cap 321 is abutted against the adjustment sleeve 31. The column cap 321 is used to abut against the adjustment sleeve 31, and the guide column 322 is used as a supporting structure for the electromagnetic part 4 and the brake part 2, so that the electromagnetic part 4 and the brake part 2 move in the first direction, and provide reliable support for the movement of the electromagnetic part 4 and the brake part 2. In addition, an adjustment hole is provided at the end of the column cap 321. When in use, after rotating the adjusting sleeve 31, the column cap 321 is rotated with a tool, and the column cap 321 drives the guide column 322 to engage with the machine base 1 threadedly, so that the guide column 322 moves in the first direction and eliminates the gap between the column cap 321 and the adjusting sleeve 31, further making the column cap 321, the adjusting sleeve 31, the guide sleeve 33, and the machine base 1 abut in sequence, thereby improving the stability of the guide sleeve 33 in the first direction.

[0039] In order to further increase the friction resistance of the brake part 2 moving on the guide sleeve 33. Figure 4 As shown, the guide structure 3 also has a sliding bearing 34, which is installed on the brake part 2 and sleeved on the outside of the guide sleeve 33. The brake part 2 slides with the guide sleeve 33 through the sliding bearing 34. The sliding bearing 34 reduces the friction coefficient between the brake part 2 and the guide sleeve 33, reduces the friction resistance of the brake part 2 when moving, and also avoids wear between the brake part 2 and the guide sleeve 33.

[0040] like Figure 4As shown, the base 1 is provided with a brake wheel 6, the brake part 2 cooperates with the brake wheel 6, and the brake part 2 has a first moving position and a second moving position. In the first moving position, the brake part 2 abuts against the brake wheel 6; in the second moving position, the brake part 2 is away from the brake wheel 6. The brake wheel 6 is used to drive the traction wheel to rotate, thereby providing traction for the elevator car to move up and down. The electromagnetic part 4 cooperates with the brake part 2, so that the brake part 2 has a first moving position and a second moving position. After the electromagnetic part 4 is energized, the brake part 2 moves to the second moving position, and the brake part 2 is separated from the brake wheel 6.

[0041] like Figure 4 As shown, the electromagnetic part 4 has a coil 43, and the coil 43 is used to connect to a power source. The brake part 2 has a first adsorption surface 22, and the electromagnetic part 4 has a second adsorption surface 43. The first adsorption surface 22 is used to magnetically cooperate with the second adsorption surface 43, so that the brake part 2 has a first moving position and a second moving position. After the coil 43 of the electromagnetic part 4 is connected to a power source, the coil 43 conducts electricity to generate a magnetic field, so that the second adsorption surface 43 has a magnetic force, and the second adsorption surface 43 is used to adsorb the first adsorption surface 22, so that the brake part 2 moves from the first moving position to the second moving position.

[0042] like Figure 4 As shown, the brake 100 also has a return spring 5, the first end of which is mounted on the first adsorption surface 22, and the second end of which is mounted on the second adsorption surface 43. After the electromagnetic part 4 is powered on, the brake part 2 moves from the first moving position to the second moving position, the first adsorption surface 22 and the second adsorption surface 43 are close to each other, the return spring 5 is compressed, and the return spring 5 generates a reverse force; when the electromagnetic part 4 is powered off, the magnetic field of the electromagnetic part 4 disappears, and the reaction force generated by the return spring 5 drives the brake part 2 to move from the second moving position to the first moving position, completing the reset action.

[0043] When quoting drawing descriptions, new features that appear are described; in order to avoid repeated quotations of drawings resulting in less concise descriptions, features that have been described clearly will not be quoted in the drawings one by one.

[0044] The purpose of the above embodiments is to exemplarily reproduce and deduce the technical solution of the utility model, and to fully describe the technical solution, purpose and effect of the utility model. Its purpose is to make the public understand the disclosed content of the utility model more thoroughly and comprehensively, and it does not limit the protection scope of the utility model.

[0045] The above embodiments are not exhaustive enumerations based on the present invention, and there may be multiple other implementations not listed. Any replacement and improvement made without violating the concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A brake with a guide structure, characterized in that: It includes an electromagnetic part, a brake part, and a machine base. The guide structure includes a first guide member and a second guide member. The first end of the second guide member passes through the electromagnetic part, the first guide member, and the brake part in sequence and is installed on the machine base. The second end of the second guide member abuts against the first guide member. The first end of the first guide member is gap-fitted with the first end of the electromagnetic part, and the second end of the first guide member is threadedly fitted with the second end of the electromagnetic part. In the first direction, the brake part is slidingly fitted with the first end of the first guide member.

2. The brake according to claim 1, characterized in that The first guide member includes a guide sleeve and an adjustment sleeve, and the guide sleeve and the adjustment sleeve are both sleeved on the outside of the second guide member and slidably cooperate with the second guide member; at least part of the guide sleeve is located in the electromagnetic part and there is a gap between the electromagnetic part, and at least part of the adjustment sleeve is located in the electromagnetic part and is threadedly cooperated with the electromagnetic part.

3. The brake according to claim 2, characterized in that The brake part has a guide hole, the guide sleeve has a first adjustment hole, the electromagnetic part has a second adjustment hole, the inner wall of the second adjustment hole has an internal thread, and the outer wall of the adjustment sleeve has an external thread; in a first direction, at least part of the guide hole, the first adjustment hole and the second adjustment hole overlap, and the guide hole, the first adjustment hole and the second adjustment hole are all for the first end of the second guide member to pass through.

4. The brake according to claim 3, characterized in that The first end of the guide sleeve is located in the second adjustment hole, and the second end of the guide sleeve is located in the guide hole; the first end and the second end of the guide sleeve are respectively matched with the electromagnetic part and the brake part in a clearance, and a first gap is formed between the first end of the guide sleeve and the electromagnetic part, and a second gap is formed between the second end of the guide sleeve and the brake part.

5. The brake according to claim 4, characterized in that The first end of the guide sleeve abuts against the first end of the adjustment sleeve, the second end of the adjustment sleeve abuts against the second end of the second guide member, and the second end of the guide sleeve abuts against the machine base.

6. The brake according to claim 3, characterized in that The second guide member includes a column cap and a guide column. The outer diameter of the column cap is larger than the outer diameter of the guide column. The first end of the guide column passes through the second adjustment hole, the first adjustment hole and the guide hole in sequence, and is threadedly connected to the machine base. The second end of the guide column is fixed to the column cap, and the column cap is against the adjustment sleeve.

7. The brake according to claim 2, characterized in that The guide structure also has a sliding bearing, which is installed on the brake part and sleeved on the outside of the guide sleeve. The brake part is slidably matched with the guide sleeve through the sliding bearing.

8. The brake according to claim 1, characterized in that A brake wheel is provided on the machine base, and the brake part cooperates with the brake wheel. The brake part has a first moving position and a second moving position. In the first moving position, the brake part is against the brake wheel; in the second moving position, the brake part is away from the brake wheel.

9. The brake according to claim 8, characterized in that The electromagnetic part has a coil, which is used to connect to a power source. The brake part has a first adsorption surface, and the electromagnetic part has a second adsorption surface. The first adsorption surface is used to magnetically cooperate with the second adsorption surface so that the brake part has a first moving position and a second moving position.

10. The brake according to claim 9, characterized in that The brake also has a return spring, a first end of the return spring is installed on the first adsorption surface, and a second end of the return spring is installed on the second adsorption surface.

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