Electromagnetic brake

Abstract

The utility model provides an electromagnetic brake which comprises a magnet yoke seat, a coil, a locking piece, a pressing plate, an armature and a friction assembly. The magnet yoke seat is provided with a coil and a locking piece; the pressing plate is assembled on the locking piece; the magnet yoke seat is provided with a coil, an elastic piece is arranged between the armature and the magnet yoke seat, the pressing plate is locked on the magnet yoke seat through a locking piece, the friction assembly comprises a friction plate and a connecting piece, the friction plate and the connecting piece are stacked, the locking piece penetrates through the armature and the friction plate, and the connecting piece is used for being connected with a rotating shaft of a driving source. When the coil is electrified, the connecting sheet can rotate relative to the friction sheet; and when the coil is powered off, the connecting sheet stops rotating under the action of friction force provided by the friction sheet. Due to the fact that the friction plate and the connecting plate are arranged in the stacked mode, the connecting plate cannot collide with the friction plate when rotation is started or stopped, the friction plate does not need to be designed to resist certain impact strength, and the manufacturing difficulty and cost of the friction plate are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of braking devices, in particular to an electromagnetic brake. Background Art

[0002] Due to the particularity of the suspension bridge tower, brakes are widely used in the field of medical suspension bridge towers. Currently, the most widely used is the interference type, which provides frictional force by means of screwing or pressing a friction block.

[0003] In the related art, an electromagnetic brake includes a coil, an armature, a friction block, a hub and a pressure plate. The hub is fixed in the mounting hole of the friction block (for example, both the mounting hole and the hub are rectangular), and the hub is connected to the output shaft of the rotating motor. When the coil is energized, the armature and the pressure plate respectively abut against the opposite two side surfaces of the friction block, and the friction block stops rotating, and the hub follows to stop rotating, and the braking is completed. However, at the moment when the friction block stops, the hub will collide with the inner wall of the friction block, so that the friction block needs to be able to resist a certain impact strength, resulting in a relatively high manufacturing difficulty and cost of the friction block. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an electromagnetic brake, aiming at solving the problem that the friction block in the electromagnetic brake in the related art needs to resist a certain impact strength.

[0005] To solve the above technical problem, the utility model provides an electromagnetic brake, which includes a yoke seat, an armature, a friction assembly and a pressure plate arranged in sequence. The yoke seat is provided with a coil. An elastic member is arranged between the armature and the yoke seat. The pressure plate is locked on the yoke seat through a locking member. The friction assembly includes a friction plate and a connecting plate. The friction plate and the connecting plate are stacked. The locking member penetrates through the armature and the friction plate. The connecting plate is used for connecting with the rotating shaft of the driving source.

[0006] Wherein, when the coil is energized, the yoke seat adsorbs the armature, the elastic member is in a contracted state, and the connecting plate can rotate relative to the friction plate. When the coil is de-energized, the yoke seat abuts against the friction assembly under the action of the resilience provided by the elastic member, so that the connecting plate stops rotating under the action of the frictional force provided by the friction plate.

[0007] Optionally, the friction assembly is provided with at least two friction plates and at least one connecting plate. The plurality of friction plates are stacked, and the connecting plate is arranged between two adjacent friction plates.

[0008] Optionally, the friction plate includes a fixing portion and a friction portion. The locking member penetrates through the fixing portion. The friction portions are arranged on the opposite two side surfaces of the fixing portion, and the connecting plate is attached to the friction portion.

[0009] Optionally, a convex portion is provided on a surface of the armature away from the yoke seat, and the convex portion is in contact with the friction assembly.

[0010] Optionally, the connecting piece is provided with a first through hole penetrating through both ends thereof, and the friction plate is provided with a second through hole penetrating through both ends thereof, and the diameter of the first through hole is smaller than the diameter of the second through hole.

[0011] Optionally, the connecting piece is provided with a positioning notch communicating with the first through hole; a positioning member is fixed to a rotating shaft of the driving source, and the positioning member extends into the positioning notch.

[0012] Optionally, the connecting piece is provided with a first mounting hole penetrating through both ends thereof, and the first mounting hole is not communicated with the first through hole; the electromagnetic brake further includes a connecting member fixed to the connecting piece and received in the first mounting hole, and the connecting member is used for connecting with the rotating shaft of the driving source.

[0013] Optionally, the pressing plate is provided with a positioning hole, and the electromagnetic brake further includes a guide sleeve. One end of the guide sleeve is fixed to the yoke seat, and the other end penetrates through the armature, the friction plate and the connecting piece and extends into the positioning hole. One end of the locking member is fixed to the pressing plate, and the other end passes through the guide sleeve and is connected to the yoke seat.

[0014] Optionally, the electromagnetic brake further includes a guide shaft. The armature is provided with a guide hole. One end of the guide shaft is fixed to the yoke seat, and the other end extends into the guide hole. The guide shaft is parallel to the locking member, and the armature is slidably assembled on the guide shaft.

[0015] Optionally, a receiving hole is provided on a surface of the yoke seat close to the armature. One end of the elastic member is received in the receiving hole, and the other end abuts against the armature.

[0016] Compared with the related art, an electromagnetic brake in the present utility model has the beneficial effects that when the coil is energized, the yoke seat adsorbs the armature, and the armature compresses the elastic member so that the elastic member is in a contracted state, and the armature does not apply pressure to the friction assembly, so that the fit between the connecting piece and the friction plate is relatively loose, and the connecting piece can rotate relative to the friction plate; when the coil is de-energized, the yoke seat abuts against the friction assembly under the action of the resilience provided by the elastic member, so that the fit between the connecting piece and the friction plate is relatively tight, so that the connecting piece stops rotating under the action of the frictional force provided by the friction plate. Since the friction plate and the connecting piece are stacked, the connecting piece will not collide with the friction plate when starting or stopping rotation, so that the friction plate does not need to be designed to resist a certain impact strength, reducing the manufacturing difficulty and cost of the friction plate. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present utility model or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is an assembly schematic diagram of the electromagnetic brake provided by the embodiment of the present utility model connected to the rotating shaft through the positioning member;

[0019] Figure 2 is a cross-sectional view of the electromagnetic brake provided by the embodiment of the present utility model;

[0020] Figure 3 is a schematic diagram of the electromagnetic brake provided by the embodiment of the present utility model connected to the rotating shaft through the connecting member;

[0021] Figure 4 is an exploded view of the electromagnetic brake provided by the embodiment of the present utility model;

[0022] Figure 5 is an exploded view of the friction assembly in the electromagnetic brake provided by the embodiment of the present utility model;

[0023] Figure 6 is a schematic diagram of the yoke seat in the electromagnetic brake provided by the embodiment of the present utility model.

[0024] In the drawings, each reference numeral represents: 1, yoke seat; 11, receiving hole; 12, receiving groove; 13, connecting hole; 2, armature; 21, protruding portion; 22, guiding hole; 3, friction assembly; 31, friction plate; 311, fixing portion; 312, friction portion; 313, second through hole; 32, connecting piece; 321, first through hole; 322, positioning notch; 323, first mounting hole; 4, pressing plate; 41, positioning hole; 5, connecting piece; 6, guiding sleeve; 7, locking piece; 8, guiding shaft; 9, steel pipe; 10, rotating shaft; 101, second mounting hole; 20, positioning member; 201, positioning portion; 202, connecting portion. Detailed implementation manners

[0025] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" and "several" mean two or more, unless otherwise specifically defined.

[0028] Embodiment:

[0029] Please refer to Figures 1 to 6 , an electromagnetic brake is provided in an embodiment of the present utility model, which includes a yoke seat 1, a coil, a locking member 7, a pressing plate 4, an armature 2, and a friction assembly 3. The yoke seat 1 is provided with a coil and a locking member 7; the pressing plate 4 is assembled to the locking member 7; the yoke seat 1 is provided with a coil, and an elastic member is provided between the armature 2 and the yoke seat 1. The pressing plate 4 is locked to the yoke seat 1 through the locking member 7. The friction assembly 3 includes a friction plate 31 and a connecting plate 32, and the friction plate 31 and the connecting plate 32 are stacked. The locking member 7 passes through the armature 2 and the friction plate 31, and the connecting plate 32 is used to connect to the rotating shaft 10 of the driving source.

[0030] When the coil is energized, the yoke seat 1 adsorbs the armature 2, and the armature 2 compresses the elastic member so that the elastic member is in a contracted state, and the armature 2 does not apply pressure to the friction assembly 3, making the fit between the connecting piece 32 and the friction plate 31 relatively loose, and the connecting piece 32 can rotate relative to the friction plate 31; when the coil is de-energized, the yoke seat 1 abuts against the friction assembly 3 under the action of the resilience provided by the elastic member, making the fit between the connecting piece 32 and the friction plate 31 relatively tight, so that the connecting piece 32 stops rotating under the action of the frictional force provided by the friction plate 31. Since the friction plate 31 and the connecting piece 32 are stacked, the connecting piece 32 will not collide with the friction plate 31 when starting or stopping rotation, so that the friction plate 31 does not need to be designed to resist a certain impact strength, reducing the manufacturing difficulty and cost of the friction plate 31.

[0031] It should be understood that when the armature 2 abuts against the friction assembly 3, the armature 2 provides pressure through the resilience provided by the elastic member, causing friction between the friction plate 31 and the connecting piece 32, and the frictional force prevents the rotation of the connecting piece 32 to achieve the prevention of the rotation of the rotating shaft 10 of the driving source, thereby achieving braking.

[0032] Please refer to Figure 2 、 Figure 3 and Figure 5 In some embodiments, the friction assembly 3 is provided with a friction plate 31 and a connecting piece 32. The two side surfaces of the friction plate 31 are respectively in contact with the armature 2 and the connecting piece 32, and the surface of the connecting piece 32 away from the friction plate 31 is in contact with the pressing plate 4; alternatively, the two side surfaces of the connecting piece 32 are respectively in contact with the armature 2 and the friction plate 31, and the surface of the friction plate 31 away from the connecting piece 32 is in contact with the pressing plate 4.

[0033] Please refer to Figure 2 、 Figure 3 and Figure 5 In some embodiments, the friction assembly 3 is provided with at least two friction plates 31 and at least one connecting piece 32. The multiple friction plates 31 are stacked, and the connecting piece 32 is arranged between two adjacent friction plates 31, so that during the braking process, the armature 2 and the connecting piece 32 are only in contact with the friction plates 31, which can avoid generating sharp abnormal noises. In a specific example, the friction assembly 3 can be provided with three friction plates 31 and two connecting pieces 32, and one connecting piece 32 is arranged between two adjacent friction plates 31.

[0034] Please refer to Figure 2 and Figure 5, the friction plate 31 includes a fixing portion 311 and a friction portion 312. The locking member 7 passes through the fixing portion 311, thereby restricting the friction plate 31 to move only along the axial direction of the locking member 7, changing the tightness of the fit between the friction plate 31 and the connecting plate 32; friction portions 312 are provided on both opposite side surfaces of the fixing portion 311, and the connecting plate 32 is in contact with the friction portions 312. Among them, the friction portions 312 are made of wear-resistant materials with higher hardness, and the fixing portion 311 is made of metal materials with higher rigidity. The friction portions 312 are relatively brittle, and attaching them to the fixing portion 311 can improve the strength and durability of the friction plate 31.

[0035] Please refer to Figure 2 and Figure 4 , on the side surface of the armature 2 away from the yoke seat 1, there is a convex portion 21, and the convex portion 21 is in contact with the friction assembly 3. Among them, the convex portion 21 is in contact with the friction portion 312. The provision of the convex portion 21 is beneficial for the armature 2 to abut against the friction plate 31.

[0036] Please refer to Figure 2 and Figure 5 , the connecting plate 32 is provided with a first through hole 321 penetrating through both ends thereof, and the friction plate 31 is provided with a second through hole 313 penetrating through both ends thereof. The diameter of the first through hole 321 is smaller than the diameter of the second through hole 313, such that a part of the connecting plate 32 protrudes into the second through hole 313, which is beneficial for connecting the rotating shaft 10 of the driving source with the connecting plate 32. According to actual needs, the yoke seat 1, the armature 2, the connecting plate 32, the friction plate 31, and the pressing plate 4 are all annular, and the yoke seat 1, the armature 2, the connecting plate 32, the friction plate 31, and the pressing plate 4 are coaxially arranged.

[0037] Please refer to Figure 1 and Figure 2 , in some embodiments, the connecting plate 32 is provided with a positioning notch 322 communicating with the first through hole 321; a positioning member 20 is fixed on the rotating shaft 10 of the driving source, and the positioning member 20 extends into the positioning notch 322. When the rotating shaft 10 rotates, the connecting plate 32 is driven to rotate by the positioning member 20; when the connecting plate 32 stops rotating, the rotating shaft 10 is prevented from rotating by the positioning member 20, thereby achieving braking. Specifically, the positioning member 20 includes a connecting portion 202 and a positioning portion 201. The connecting portion 202 is fixed on the rotating shaft 10 by screws, one end of the positioning portion 201 is fixed to the connecting portion 202, and the other end extends axially into the positioning notch 322; among them, the positioning portion 201 can be vertically arranged, and the connecting portion 202 can be horizontally arranged. By providing the positioning member 20 for torque transmission between the connecting plate 32 and the rotating shaft 10, the structure is simple, and the virtual position can be controlled within a very fine range.

[0038] According to actual needs, a plurality of positioning members 20 and positioning notches 322 are provided. The plurality of positioning members 20 and the plurality of positioning notches 322 are both circumferentially spaced apart, and the plurality of positioning members 20 and the plurality of positioning notches 322 are arranged in one-to-one correspondence. The positioning member 20 can be an L-shaped block, and the positioning notch 322 can be a rectangular opening.

[0039] Please refer to Figure 3 and Figure 4 , in some embodiments, the connecting piece 32 is provided with a first mounting hole 323 penetrating through both ends thereof, and the first mounting hole 323 is not communicated with the first through hole 321; the electromagnetic brake further includes a connecting member 5 fixed to the connecting piece 32 and received in the first mounting hole 323. The connecting member 5 is used to be connected to the rotating shaft 10 of the driving source. When the rotating shaft 10 rotates, the connecting piece 32 rotates followingly through the connecting member 5; when the connecting piece 32 stops rotating, the rotating shaft 10 is prevented from rotating through the connecting member 5, thereby realizing braking. Specifically, the electromagnetic brake further includes a steel pipe 9. The connecting member 5 can be a steel column. The rotating shaft 10 is provided with a second mounting hole 101. The two ends of the steel pipe 9 are respectively fixed to the connecting piece 32 and the rotating shaft 10, and the two ends of the steel pipe 9 are respectively received in the first mounting hole 323 and the second mounting hole 101. The steel column is received in the steel pipe 9, and the two ends of the steel column are respectively fixed to the connecting piece 32 and the rotating shaft 10. By providing the connecting member 5 for torque transmission between the connecting piece 32 and the rotating shaft 10, the structure is simple, the overall connection strength can be improved, and at the same time, the play can be controlled within a very fine range.

[0040] According to actual needs, a plurality of connecting members 5, first mounting holes 323 and second mounting holes 101 are provided. The plurality of connecting members 5, first mounting holes 323 and second mounting holes 101 are all circumferentially spaced apart, and the plurality of connecting members 5, the plurality of first mounting holes 323 and the plurality of second mounting holes 101 are arranged in one-to-one correspondence.

[0041] Please refer to Figure 1 and Figure 4 , the pressing plate 4 is provided with a positioning hole 41. The electromagnetic brake further includes a guide sleeve 6. One end of the guide sleeve 6 is fixed to the yoke seat 1, and the other end penetrates through the armature 2, the friction plate 31 and the connecting piece 32 and extends into the positioning hole 41. One end of the locking member 7 is fixed to the pressing plate 4, and the other end passes through the guide sleeve 6 and is connected to the yoke seat 1, thereby locking the pressing plate 4 above the yoke seat 1. Among them, the locking member 7 can be a bolt. The yoke seat 1 is provided with a connection hole 13. The locking member 7 is located in the connection hole 13 and is threadedly connected to the yoke seat 1, so that the position of the pressing plate 4 can be adjusted by using the bolt, which is beneficial to adjusting the air gap between the friction plate 31 and the connecting piece 32; both the armature 2 and the friction plate 31 are slidably assembled on the guide sleeve 6. Providing the guide sleeve 6 can guide the sliding. According to actual needs, a plurality of guide sleeves 6 and locking members 7 are provided and are circumferentially spaced apart, and the plurality of locking members 7 and the plurality of guide sleeves 6 are arranged in one-to-one correspondence.

[0042] Please refer to Figure 4 and Figure 6 The electromagnetic brake further includes a guide shaft 8. The armature 2 is provided with a guide hole 22. One end of the guide shaft 8 is fixed to the yoke seat 1, and the other end extends into the guide hole 22. The guide shaft 8 is parallel to the locking member 7. The armature 2 is slidably assembled on the guide shaft 8. The arrangement of the guide shaft 8 can not only guide the armature 2, but also prevent the armature 2 from radially disengaging from the yoke seat 1. According to actual needs, a plurality of guide shafts 8 and a plurality of guide holes 22 are provided. The plurality of guide shafts 8 and the plurality of guide holes 22 are circumferentially spaced apart and arranged in one-to-one correspondence.

[0043] Please refer to Figure 4 and Figure 6 One side surface of the yoke seat 1 close to the armature 2 is provided with a receiving hole 11. One end of the elastic member is received in the receiving hole 11, and the other end abuts against the armature 2, thereby installing the elastic member between the yoke seat 1 and the armature 2 to ensure that the elastic member can provide a restoring force to drive the armature 2 to move towards the friction plate 31. According to actual needs, the elastic member can be a spring. A plurality of elastic members and a plurality of receiving holes 11 are provided. The plurality of elastic members and the plurality of receiving holes 11 are circumferentially spaced apart and arranged in one-to-one correspondence.

[0044] Please refer to Figure 4 and Figure 6 One side of the yoke seat 1 close to the armature 2 is provided with a receiving groove 12. The receiving groove 12 is annular. The coil is received in the receiving groove 12. When the coil is energized, a magnetic field is generated. The yoke seat 1 is magnetized in the magnetic field to have magnetic attraction for the armature 2. The armature 2 moves towards the yoke seat 1 to compress the elastic member. When the coil is de-energized, the magnetic field disappears, the magnetism of the yoke seat 1 disappears, and the armature 2 moves towards the friction plate 31 under the action of the restoring force of the elastic member to abut against the friction plate 31, so that a large frictional force is generated between the friction plate 31 and the connecting piece 32 to prevent the connecting piece 32 from rotating, realizing braking.

[0045] During the assembly process of the electromagnetic brake, first place the guide shaft 8 in the guide hole 22, place the elastic member in the receiving hole 11, then place the armature 2 on the yoke seat 1, place the guide sleeve 6 on the corresponding holes of the armature 2 and the yoke seat 1, then place the friction plate 31 and the connecting piece 32, and then place the pressing plate 4. Finally, use the locking member 7 to lock the pressing plate 4 above the yoke seat 1.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic brake, characterized in that: It comprises a yoke seat, an armature, a friction assembly and a pressure plate which are arranged in sequence, the yoke seat is provided with a coil, an elastic member is arranged between the armature and the yoke seat, the pressure plate is locked on the yoke seat by a locking member, the friction assembly comprises a friction plate and a connecting plate, the friction plate and the connecting plate are arranged in layers, the locking member passes through the armature and the friction plate, and the connecting plate is used to be connected to the rotating shaft of the driving source; Wherein, when the coil is energized, the yoke seat absorbs the armature, the elastic member is in a contracted state, and the connecting plate can rotate relative to the friction plate; when the coil is de-energized, the yoke seat presses against the friction assembly under the action of the rebound force provided by the elastic member, so that the connecting plate stops rotating under the action of the friction force provided by the friction plate.

2. The electromagnetic brake according to claim 1, characterized in that The friction assembly is provided with at least two friction plates and at least one connecting plate. A plurality of the friction plates are stacked, and the connecting plate is arranged between two adjacent friction plates.

3. The electromagnetic brake according to claim 1, characterized in that The friction plate comprises a fixing portion and a friction portion, the locking member passes through the fixing portion, the friction portions are arranged on two opposite side surfaces of the fixing portion, and the connecting plate is in contact with the friction portion.

4. The electromagnetic brake according to claim 1, characterized in that A protrusion is provided on a surface of one side of the armature away from the yoke seat, and the protrusion is in contact with the friction assembly.

5. The electromagnetic brake according to claim 1, characterized in that The connecting plate is provided with a first through hole passing through both ends thereof, and the friction plate is provided with a second through hole passing through both ends thereof, and the diameter of the first through hole is smaller than the diameter of the second through hole.

6. The electromagnetic brake according to claim 5, characterized in that The connecting piece is provided with a positioning notch communicated with the first through hole; the rotating shaft of the driving source is fixed with a positioning piece, and the positioning piece extends into the positioning notch.

7. The electromagnetic brake according to claim 5, characterized in that The connecting plate is provided with a first mounting hole passing through both ends thereof, and the first mounting hole is not connected to the first through hole; the electromagnetic brake also includes a connecting member fixed to the connecting plate and accommodated in the first mounting hole, and the connecting member is used to be connected to the rotating shaft of the driving source.

8. The electromagnetic brake according to claim 1, characterized in that The pressure plate is provided with a positioning hole, and the electromagnetic brake also includes a guide sleeve, one end of which is fixed to the yoke seat, and the other end passes through the armature, the friction plate and the connecting plate and extends into the positioning hole; one end of the locking member is fixed to the pressure plate, and the other end passes through the guide sleeve and is connected to the yoke seat.

9. The electromagnetic brake according to claim 1, characterized in that The electromagnetic brake also includes a guide shaft, the armature is provided with a guide hole, one end of the guide shaft is fixed to the yoke seat, and the other end extends into the guide hole. The guide shaft is parallel to the locking piece, and the armature is slidably assembled on the guide shaft.

10. The electromagnetic brake according to claim 1, characterized in that A receiving hole is provided on a surface of one side of the yoke seat close to the armature, one end of the elastic member is received in the receiving hole, and the other end is in contact with the armature.

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