Double-brake-position electromagnetic brake for electric winch

Abstract

The utility model belongs to the technical field of electromagnetic brakes for electric winches, and mainly relates to a double-brake-position electromagnetic brake for an electric winch, which comprises an end cover and a magnet yoke assembly which are coaxially and rotatably assembled on a rotating shaft of a motor, and the magnet yoke assembly and the end cover are assembled together in a manner that the spacing distance can be adjusted; the first brake disc and the second brake disc are both coaxially assembled on the rotating shaft in a spline mode, and the first brake disc and the second brake disc are both located between the magnet yoke assembly and the end cover; and the first armature and the second armature are coaxially connected to the rotating shaft in a sleeving mode, the first armature and the second armature are slidably assembled between the magnet yoke assembly and the end cover in the axial direction of the rotating shaft of the motor, the first armature is close to the magnet yoke assembly, and the two brake discs and the two armatures are sequentially and alternately arranged. By arranging the two brake discs, the electromagnetic brake can achieve braking by locking the two brake discs when power is off, and therefore the braking effect of the electromagnetic brake is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic brakes for electric winches, and mainly relates to a double-braking-position electromagnetic brake for an electric winch. Background Art

[0002] An electromagnetic brake is a friction plate type brake that is released (i.e., disengaged) when powered on and generates a frictional torque when the spring exerts pressure when powered off. Such a brake can be paired with the rotating shaft of an electric motor to form a braking motor; it can also be used in a mechanical transmission system to achieve rapid stopping and accurate positioning; it can also be used in occasions such as safety braking when powered off.

[0003] However, in the existing technology, the electromagnetic brake with a single brake disc has an unsatisfactory braking effect in some occasions. Summary of the Utility Model

[0004] The utility model provides a double-braking-position electromagnetic brake for an electric winch to solve the problem of unsatisfactory braking effect of the electromagnetic brake in the existing technology.

[0005] To solve the above problems, the utility model adopts the following technical solutions:

[0006] A double-braking-position electromagnetic brake for an electric winch includes:

[0007] An end cover, coaxially and rotatably assembled on the rotating shaft of the electric motor, and the end cover is used for fixedly assembling on the electric motor;

[0008] A yoke assembly, coaxially and rotatably assembled on the rotating shaft of the electric motor, with an adjustable spacing distance between the yoke assembly and the end cover, and the yoke assembly and the end cover are assembled together by a way of being able to adjust the spacing distance;

[0009] A first brake disc and a second brake disc, both coaxially assembled on the rotating shaft of the electric motor by splines, and both the first brake disc and the second brake disc are located between the yoke assembly and the end cover;

[0010] A first armature and a second armature, both coaxially sleeved on the rotating shaft of the electric motor, and both the first armature and the second armature are axially slidably assembled between the yoke assembly and the end cover along the rotating shaft of the electric motor, the first armature is close to the yoke assembly, and the two brake discs and the two armatures are alternately arranged in sequence.

[0011] It has the following beneficial effects: By setting two brake discs, the electromagnetic brake can achieve braking by clamping the two brake discs when powered off, thereby improving the braking effect of the electromagnetic brake.

[0012] Further, it further includes a guiding and limiting component. The first armature and the second armature are slidably guided and assembled between the yoke assembly and the end cover through the guiding and limiting component, and the yoke assembly and the end cover are assembled together through the guiding and limiting component in a manner that the spacing distance can be adjusted.

[0013] It has the following beneficial effects: The guiding and limiting component can enable the first armature and the second armature to slide and guide between the yoke assembly and the end cover, so as to realize the separation and contact between the two armatures and the two brake discs. The contact between the two armatures and the two brake discs realizes the braking of the electric winch.

[0014] Further, the guiding and limiting component includes:

[0015] Guiding sleeves, there are multiple guiding sleeves. Each guiding sleeve has a coaxial central through hole, and the central through hole is a smooth hole. Each guiding sleeve sequentially slides through the second armature and the first armature. One end of the guiding sleeve is threadedly connected to the yoke assembly, and the other end of the guiding sleeve presses against the end cover, so that there is an adjustable spacing distance between the end cover and the yoke assembly. The multiple guiding sleeves are circumferentially evenly distributed around the rotation axis of the motor.

[0016] Locking bolts, there are multiple locking bolts. The multiple locking bolts correspond to the guiding sleeves one by one. Each locking bolt penetrates through the yoke assembly, passes through the central through hole, and is threadedly connected to the end cover. Each locking bolt is in a blocking fit with the yoke assembly to fix the yoke assembly and the end cover.

[0017] Guiding bolts, there are multiple guiding bolts. Each guiding bolt slides through the second armature and is threadedly connected to the first armature. Each guiding bolt is in a blocking fit with the second armature. A plurality of elastic members are provided between the first armature and the second armature. Each elastic member is sleeved outside the guiding bolt. The multiple guiding bolts are circumferentially evenly distributed around the rotation axis of the motor.

[0018] It has the following beneficial effects: By providing guiding bolts that slide through the second armature and are threadedly connected to the first armature, and at the same time providing elastic members between the first armature and the second armature, the elastic members keep the distance between the first armature and the second armature relatively stable when braking is not required. When the friction layer on the brake disc becomes thinner after long-term use of the brake disc and the distance between the yoke assembly and the end cover needs to be adjusted, the guiding sleeves and the locking bolts can be simultaneously screwed to adjust the distance between the yoke assembly and the end cover, so that the electromagnetic brake can brake better.

[0019] Further, the guiding and limiting component includes:

[0020] There are multiple guide sleeves, each of which has a coaxial central through hole, which is a light hole, and each guide sleeve slides through the second armature and the first armature in sequence, one end of the guide sleeve is threadedly connected to the yoke assembly, and the other end of the guide sleeve is pressed on the end cover, so that there is an adjustable spacing distance between the end cover and the yoke assembly, and the multiple guide sleeves are evenly distributed in the circumferential direction with the rotating shaft of the motor as the center;

[0021] A limit piece is threadedly connected to the guide sleeve, the limit piece is located between the second armature and the end cover, the limit piece cooperates with the second armature to stop, a plurality of elastic pieces are arranged between the first armature and the second armature, and each elastic piece is sleeved on the outer side of the guide sleeve;

[0022] There are multiple locking bolts, which correspond to the guide sleeves one by one. Each locking bolt passes through the yoke assembly, passes through the central through hole, and is threadedly connected to the end cover. Each locking bolt cooperates with the yoke assembly stop to fix the yoke assembly and the end cover.

[0023] Furthermore, the guide limit assembly comprises:

[0024] A plurality of guide posts are provided, each of which slides through the first armature and the second armature, and one end of the guide post is provided on the yoke assembly, and the other end of the guide post is provided on the end cover, and the plurality of guide posts are evenly distributed in the circumferential direction with the rotating shaft of the motor as the center;

[0025] There are multiple locking screws, one end of each locking screw is fixedly assembled on the end cover, and the other end of each locking screw passes through the yoke assembly. Two locking nuts are threadedly connected to each locking screw, and the two locking nuts are arranged on both sides of the yoke assembly so that the two locking nuts can lock the yoke assembly along the axial direction of the guide column. The multiple locking screws are evenly distributed circumferentially with the rotating shaft of the motor as the center.

[0026] Further, the yoke assembly includes a yoke disk and a plurality of coils and a plurality of brake compression springs mounted on the yoke disk, the yoke disk is coaxially rotatably assembled on the rotating shaft of the motor, the yoke disk is located on a side of the first armature away from the first brake disk, and the plurality of coils and the plurality of brake compression springs are uniformly distributed on the yoke disk in a circumferential direction with the rotating shaft of the motor as the center;

[0027] A plurality of brake compression springs press the first armature to make the armature contact with the brake disc. When the coil is energized, it can magnetically attract the first armature to separate the armature from the brake disc.

[0028] It has the following beneficial effects: When the electric winch is running, the coil always magnetically attracts the first armature and the second armature. The first armature compresses the brake compression spring. In the case of power failure, the coil no longer magnetically attracts the first armature and the second armature, and the brake compression spring is released. The brake compression spring will press against the first armature, causing the first armature to closely adhere to the first brake disc, the first brake disc to closely adhere to the second armature, the second armature to closely adhere to the second brake disc, and the second brake disc to closely adhere to the end cover, thereby achieving braking.

[0029] Furthermore, it also includes a manual release mechanism, which is used to manually release the electric winch emergently when the electric winch is powered off and locked. Description of the Drawings

[0030] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0031] Figure 1 is the structural schematic diagram of Embodiment 1 of the present utility model;

[0032] Figure 2 is the exploded view of Embodiment 1 of the present utility model;

[0033] Figure 3 is the left view of Embodiment 1 of the present utility model;

[0034] Figure 4 is Figure 3 the sectional view taken along the line A - A in

[0035] Figure 5 is Figure 3 the sectional view taken along the line B - B in

[0036] Figure 6 is the front view of Embodiment 1 of the present utility model;

[0037] Figure 7 is Figure 6 the sectional view taken along the line C - C in

[0038] Figure 8 is the structural schematic diagram of Embodiment 2 of the utility model;

[0039] Figure 9 is the structural schematic diagram of Embodiment 3 of the utility model.

[0040] Description of the Reference Numerals:

[0041] 1. Yoke disc; 2. End cover; 3. First armature; 4. Second armature; 5. First brake disc; 6. Second brake disc; 7. Guide sleeve; 8. Locking bolt; 9. Guide bolt; 10. Spring; 11. Rotating shaft; 12. Brake compression spring; 13. Coil; 14. First bearing; 15. Second bearing; 16. Gear sleeve; 17. Limit nut; 18. Guide post; 19. Locking screw; 20. Locking nut. Detailed implementation manners

[0042] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the embodiments described below are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0043] The various non-restrictive implementation manners of the present utility model will be specifically introduced below. The number of any element in the accompanying drawings is for illustration rather than limitation, and any naming is only for distinction without any limiting meaning. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0044] Embodiment 1

[0045] As Figure 1 、 Figure 2 shown, a double-brake-position electromagnetic brake for an electric winch includes an end cover 2, a yoke assembly, a first brake disc 5, a second brake disc 6, a first armature 3, a second armature 4, a guide and limit assembly, and a manual release mechanism (not shown).

[0046] Among them, the end cover 2 is coaxially and rotatably assembled on the rotating shaft 11 of the motor through the first bearing 14, and the end cover 2 is used for fixedly assembling on the motor.

[0047] The yoke assembly is coaxially and rotatably assembled on the rotating shaft 11 of the motor through the second bearing 15. There is an adjustable distance between the yoke assembly and the end cover 2. When the distance between the yoke assembly and the end cover 2 is too large to brake well, the distance between the yoke assembly and the end cover 2 can be reduced so that the electric winch can brake better. That is, the yoke assembly and the end cover 2 are assembled together by a way of adjustable distance.

[0048] As Figures 3 - 5As shown, the first brake disc 5 and the second brake disc 6 are coaxially assembled on the rotating shaft 11 of the motor by means of splines, that is, the rotating shaft 11 of the motor is coaxially fixed with a gear sleeve 16, the first brake disc 5 and the second brake disc 6 are coaxial with the rotating shaft 11 of the motor, and the first brake disc 5 and the second brake disc 6 are meshed with the gear sleeve 16, so that the first brake disc 5 and the second brake disc 6 can not only coaxially rotate with the rotating shaft 11 of the motor, but also slide along the axial direction of the rotating shaft 11 of the motor. The first brake disc 5 and the second brake disc 6 are both located between the yoke assembly and the end cover 2, and there is a gap between the first brake disc 5 and the second brake disc 6.

[0049] The first armature 3 and the second armature 4 are both coaxially sleeved on the rotating shaft 11 of the motor, and the first armature 3 and the second armature 4 are both slidably assembled between the yoke assembly and the end cover 2 along the axial direction of the rotating shaft 11 of the motor, that is, the first armature 3 and the second armature 4 will not rotate with the rotating shaft 11 of the motor, but will slide along the axial direction of the rotating shaft 11 of the motor. There is a gap between the first armature 3 and the second armature 4, the first brake disc 5 is located between the first armature 3 and the second armature 4, the second armature 4 is located between the first brake disc 5 and the second brake disc 6, the first armature 3 is close to the yoke assembly, and the second brake disc 6 is close to the end cover 2, that is, the two brake discs and the two armatures are alternately arranged in sequence.

[0050] By providing two brake discs, the electromagnetic brake can achieve braking by locking the two brake discs when power is off, thereby improving the braking effect of the electromagnetic brake.

[0051] The yoke assembly in this embodiment includes a yoke disc 1 and six coils 13 and six brake compression springs 12 mounted on the yoke disc 1. The yoke disc 1 is coaxially rotatably assembled on the rotating shaft 11 of the motor through a second bearing 15. The yoke disc 1 is located on the side of the first armature 3 away from the first brake disc 5. The six coils 13 and the six brake compression springs 12 are uniformly distributed on the yoke disc 1 in the circumferential direction with the rotating shaft 11 of the motor as the center. The six brake compression springs 12 press the first armature 3 to make the armature contact with the brake disc. When the coil 13 is energized, it can magnetically attract the first armature 3 to separate the armature from the brake disc.

[0052] In other embodiments, the number of coils 13 and brake compression springs 12 can be determined according to actual conditions, such as one or two or three or four or five or seven or more.

[0053] When the electric winch is running, the coil 13 always magnetically attracts the first armature 3 and the second armature 4. The first armature 3 will compress the brake compression spring 12. At this time, the two armatures and the two brake discs are separated. In the case of power failure, the coil 13 no longer magnetically attracts the first armature 3 and the second armature 4, the brake compression spring 12 is released, and the brake compression spring 12 will press against the first armature 3, causing the first armature 3 to closely adhere to the first brake disc 5, the first brake disc 5 to closely adhere to the second armature 4, the second armature 4 to closely adhere to the second brake disc 6, and the second brake disc 6 to closely adhere to the end cover 2, thereby achieving braking.

[0054] In this embodiment, the first armature 3 and the second armature 4 are slidably and guidingly assembled between the magnetic yoke disc 1 and the end cover 2 through a guiding and limiting assembly. The magnetic yoke disc 1 and the end cover 2 are assembled together through the guiding and limiting assembly in a manner that can adjust the spacing distance. The guiding and limiting assembly can enable the first armature 3 and the second armature 4 to slide and guide between the magnetic yoke disc 1 and the end cover 2, thereby realizing the separation and contact between the two armatures and the two brake discs. The contact between the two armatures and the two brake discs realizes the braking of the electric winch.

[0055] As Figures 3 - 7 shown, the guiding and limiting assembly in this embodiment includes six guiding sleeves 7, six locking bolts 8, and three guiding bolts 9. Each guiding sleeve 7 has a central through hole coaxial with it, and the central through hole is a smooth hole. Each guiding sleeve 7 sequentially slides through the second armature 4 and the first armature 3. One end of the guiding sleeve 7 is threadedly connected to the magnetic yoke disc 1, and the other end of the guiding sleeve 7 presses against the end cover 2, so that there is an adjustable spacing distance between the end cover 2 and the magnetic yoke disc 1. The six guiding sleeves 7 are circumferentially evenly distributed around the rotating shaft 11 of the motor.

[0056] As Figure 4 shown, the six locking bolts 8 correspond to the guiding sleeves 7 one by one. Each locking bolt 8 penetrates the magnetic yoke disc 1 and simultaneously passes through the central through hole of the guiding sleeve 7, and then is threadedly connected to the end cover 2. Each locking bolt 8 is in blocking fit with the magnetic yoke disc 1. Through the cooperation of the guiding sleeve 7 and the locking bolt 8, the magnetic yoke disc 1 and the end cover 2 are fixed.

[0057] In other embodiments, the number of the guiding sleeves 7 and the locking bolts 8 can be determined according to the actual situation, such as one or two or three or four or five or seven or more.

[0058] As Figure 5As shown, each guiding bolt 9 slidably penetrates through the second armature 4 and is threadedly connected to the first armature 3. Each guiding bolt 9 is in stop cooperation with the second armature 4. In this way, when the coil 13 magnetically attracts the first armature 3, the first armature 3 and the second armature 4 can move simultaneously and approach the coil 13. Three elastic members are provided between the first armature 3 and the second armature 4. The elastic members correspond to the guiding bolts 9 one by one. Each elastic member is sleeved on the outside of the corresponding guiding bolt 9. The three guiding bolts 9 are circumferentially and evenly distributed around the rotating shaft 11 of the motor.

[0059] In other embodiments, the number of the guiding bolts 9 and the elastic members can be determined according to the actual situation, such as one, two, or more than four.

[0060] The elastic member in this embodiment is a spring 10. The top pressure generated by the braking compression spring 12 is sufficient to overcome the top pressure generated by the elastic member. Even if an elastic member is provided between the first armature 3 and the second armature 4, under the top pressure of the braking compression spring 12, the distance between the first armature 3 and the second armature 4 can still be reduced, so that the two armatures and the two brake discs come into contact with each other to generate braking.

[0061] By providing the guiding bolts 9 that slidably penetrate through the second armature 4 and are threadedly connected to the first armature 3, and at the same time providing an elastic member between the first armature 3 and the second armature 4, the elastic member keeps the distance between the first armature 3 and the second armature 4 relatively stable when braking is not required; when the friction layer on the brake disc becomes thinner after long-term use of the brake disc and the distance between the yoke disc 1 and the end cover 2 needs to be adjusted, the distance between the yoke disc 1 and the end cover 2 can be adjusted by simultaneously turning the guiding sleeve 7 and the locking bolt 8, so that the electromagnetic brake can brake better.

[0062] The manual release mechanism is used to manually release the electric winch emergently when the electric winch is powered off and locked. The manual release mechanism has been described in detail in the prior art and will not be elaborated in this embodiment.

[0063] The working process of the present utility model is as follows:

[0064] When powered off, the coil 13 no longer magnetically attracts the first armature 3, so that the compressed braking compression spring 12 is released. The braking compression spring 12 will press against the first armature 3, making the first armature 3 closely attached to the first brake disc 5, the first brake disc 5 closely attached to the second armature 4, the second armature 4 closely attached to the second brake disc 6, and the second brake disc 6 closely attached to the end cover 2, thereby realizing braking.

[0065] Embodiment 2

[0066] As Figure 8As shown in the figure, the difference between this embodiment and Embodiment 1 lies in the structure of the guiding and limiting component. The guiding and limiting component in this embodiment includes six guiding sleeves 7, three limiting members, and six locking bolts 8. The limiting member in this embodiment is a limiting nut 17.

[0067] Each guiding sleeve 7 has a central through hole coaxial with it. The central through hole is a smooth hole. Each guiding sleeve 7 sequentially slides through the second armature 4 and the first armature 3. One end of the guiding sleeve 7 is threadedly connected to the yoke disc 1, and the other end of the guiding sleeve 7 presses against the end cover 2, so that there is an adjustable distance between the end cover 2 and the yoke disc 1. The six guiding sleeves 7 are circumferentially evenly distributed around the rotating shaft 11 of the motor.

[0068] The limiting nut 17 is threadedly connected to the guiding sleeve 7. The limiting nut 17 is located between the second armature 4 and the end cover 2. The limiting nut 17 is in blocking cooperation with the second armature 4. The limiting nut 17 restricts the second armature 4 from moving too much towards the end cover 2. There are three elastic members between the first armature 3 and the second armature 4. The elastic members correspond to the limiting nuts 17 one by one. Each elastic member is sleeved on the outside of the guiding sleeve 7. The elastic member in this embodiment is a spring 10.

[0069] The six locking bolts 8 correspond to the guiding sleeves 7 one by one. Each locking bolt 8 passes through the yoke disc 1 and at the same time passes through the central through hole of the guiding sleeve 7, and then is threadedly connected to the end cover 2. Each locking bolt 8 is in blocking cooperation with the yoke disc 1. Through the cooperation of the guiding sleeve 7 and the locking bolt 8, the yoke disc 1 and the end cover 2 are fixed.

[0070] In other embodiments, the number of guiding sleeves 7 and locking bolts 8 can be determined according to actual situations, such as one or two or three or four or five or more than seven.

[0071] Embodiment 3

[0072] As Figure 9 shown, the difference between this embodiment and Embodiment 1 lies in the structure of the guiding and limiting component. The guiding and limiting component in this embodiment includes six guiding columns 18, three guiding bolts 9, and six locking screws 19.

[0073] The six guiding columns 18 all slide through the first armature 3 and the second armature 4, and one end of the guiding column 18 is arranged on the yoke disc 1, and the other end of the guiding column 18 is arranged on the end cover 2. The multiple guiding columns 18 are circumferentially evenly distributed around the rotating shaft 11 of the motor;

[0074] One end of each locking screw 19 is fixedly assembled on the end cover 2, the other end of each locking screw 19 penetrates through the yoke disc 1, and two locking nuts 20 are threadedly connected to each locking screw 19. The two locking nuts 20 are respectively arranged on both sides of the yoke disc 1 so that the two locking nuts 20 lock the yoke disc 1 along the axial direction of the guide post 18. A plurality of locking screws 19 are circumferentially and uniformly distributed around the rotating shaft 11 of the motor.

[0075] Each guide bolt 9 slidably penetrates through the second armature 4 and is threadedly connected to the first armature 3. Each guide bolt 9 is in a blocking fit with the second armature 4. In this way, when the coil 13 magnetically attracts the first armature 3, the first armature 3 and the second armature 4 can move simultaneously and approach the coil 13. Three elastic members are arranged between the first armature 3 and the second armature 4. The elastic members correspond to the guide bolts 9 one by one. Each elastic member is sleeved on the outside of the corresponding guide bolt 9. The three guide bolts 9 are circumferentially and uniformly distributed around the rotating shaft 11 of the motor. The elastic member in this embodiment is a spring 10.

Claims

1. A double-braking-position electromagnetic brake for an electric winch, characterized in that, Comprising: An end cover, coaxially and rotatably assembled on the rotating shaft of the motor, and the end cover is used for fixed assembly on the motor; A yoke assembly, coaxially and rotatably assembled on the rotating shaft of the motor, with an adjustable spacing distance between the yoke assembly and the end cover, and the yoke assembly and the end cover are assembled together by a way of being able to adjust the spacing distance; A first brake disc and a second brake disc, both coaxially assembled on the rotating shaft of the motor by means of splines, and both the first brake disc and the second brake disc are located between the yoke assembly and the end cover; A first armature and a second armature, both coaxially sleeved on the rotating shaft of the motor, and both the first armature and the second armature are axially slidably assembled between the yoke assembly and the end cover along the rotating shaft of the motor, the first armature is close to the yoke assembly, and the two brake discs and the two armatures are alternately arranged in sequence.

2. The double-braking-position electromagnetic brake for an electric winch according to claim 1, wherein Further comprising a guiding and limiting assembly, the first armature and the second armature are slidably guided and assembled between the yoke assembly and the end cover by the guiding and limiting assembly, and the yoke assembly and the end cover are assembled together by the guiding and limiting assembly in a way of being able to adjust the spacing distance.

3. The double-braking-position electromagnetic brake for an electric winch according to claim 2, characterized in that, The guiding and limiting assembly includes: Guiding sleeves, having a plurality of them, each guiding sleeve has a coaxial central through hole, the central through hole is a smooth hole, each guiding sleeve sequentially slides through the second armature and the first armature, one end of the guiding sleeve is threadedly connected to the yoke assembly, and the other end of the guiding sleeve abuts against the end cover, so that there is an adjustable spacing distance between the end cover and the yoke assembly, and the plurality of guiding sleeves are circumferentially evenly distributed around the rotating shaft of the motor; Locking bolts, having a plurality of them, the plurality of locking bolts correspond to the guiding sleeves one by one, each locking bolt penetrates through the yoke assembly, passes through the central through hole, and is threadedly connected to the end cover, and each locking bolt is in a blocking fit with the yoke assembly to fix the yoke assembly and the end cover; Guiding bolts, having a plurality of them, each guiding bolt slides through the second armature and is threadedly connected to the first armature, each guiding bolt is in a blocking fit with the second armature, a plurality of elastic members are provided between the first brake disc and the second brake disc, each elastic member is sleeved on the outside of the guiding bolt, and the plurality of guiding bolts are circumferentially evenly distributed around the rotating shaft of the motor.

4. The double-braking-position electromagnetic brake for an electric winch according to claim 2, wherein, The guiding and limiting assembly includes: Guiding sleeves, having a plurality of them, each guiding sleeve has a coaxial central through hole, the central through hole is a smooth hole, each guiding sleeve sequentially slides through the second armature and the first armature, one end of the guiding sleeve is threadedly connected to the yoke assembly, and the other end of the guiding sleeve abuts against the end cover, so that there is an adjustable spacing distance between the end cover and the yoke assembly, and the plurality of guiding sleeves are circumferentially evenly distributed around the rotating shaft of the motor; Limiting members, threadedly connected to the guiding sleeves, the limiting members are located between the second armature and the end cover, the limiting members are in a blocking fit with the second armature, a plurality of elastic members are provided between the first brake disc and the second brake disc, and each elastic member is sleeved on the outside of the guiding sleeve; Locking bolts, having a plurality of them, the plurality of locking bolts correspond to the guiding sleeves one by one, each locking bolt penetrates through the yoke assembly, passes through the central through hole, and is threadedly connected to the end cover, and each locking bolt is in a blocking fit with the yoke assembly to fix the yoke assembly and the end cover.

5. The double-braking-position electromagnetic brake for an electric winch according to claim 2, wherein, The guiding and limiting assembly includes: There are multiple guide posts. The multiple guide posts all slide through the first armature and the second armature, and one end of each guide post is provided on the yoke assembly, and the other end of the guide post is provided on the end cover. The multiple guide posts are circumferentially evenly distributed around the rotation axis of the motor. There are multiple locking screws. One end of each locking screw is fixedly assembled on the end cover, and the other end of each locking screw penetrates through the yoke assembly. Two locking nuts are threadedly connected to each locking screw. The two locking nuts are respectively located on both sides of the yoke assembly, so that the two locking nuts lock the yoke assembly along the axial direction of the guide post. The multiple locking screws are circumferentially evenly distributed around the rotation axis of the motor.

6. A double-braking-position electromagnetic brake for an electric winch according to any one of claims 1-5, characterized in that, The yoke assembly includes a yoke disc, and multiple coils and multiple braking compression springs mounted on the yoke disc. The yoke disc is coaxially rotatably assembled on the rotation axis of the motor. The yoke disc is located on the side of the first armature away from the first brake disc. The multiple coils and the multiple braking compression springs are circumferentially evenly distributed on the yoke disc around the rotation axis of the motor. The multiple braking compression springs press against the first armature to make contact between the armature and the brake disc. When the coil is energized, it can magnetically attract the first armature to separate the armature from the brake disc.

7. A double-braking-position electromagnetic brake for an electric winch according to any one of claims 1-5, characterized in that, It further includes a manual release mechanism, which is used to manually release the electric winch emergently when the electric winch is powered off and locked.

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