Closed brake

Abstract

The utility model provides a closed brake, which belongs to the technical field of brakes and comprises a shell, a tail plate, an armature and a friction disc, the tail plate and the armature are positioned at the same shaft end of the shell, and the friction disc is positioned between the armature and the tail plate. The shell is provided with a middle hole penetrating in the axial direction of the shell and annular grooves formed in the periphery of the middle hole at intervals, the closed brake further comprises an electromagnetic coil and a manual release mechanism, and the electromagnetic coil is arranged in the annular grooves; the manual release mechanism comprises a handle, a middle plate and a release column, the handle and the middle plate are both located at the shaft end, away from the tail plate, of the shell, the two ends of the middle plate are assembled with the handle and the release column respectively, and the release column is in sliding fit with the middle hole. The release column is used for pushing the armature to move close to the friction disc, and a first sealing ring is arranged between the release column and the inner wall of the middle hole.

Description

Technical Field

[0001] The utility model belongs to the technical field of brakes, and in particular relates to a closed brake. Background Art

[0002] The main components of the brake are the housing, electromagnetic component, armature, friction disc, base plate and reset component. The main working principle is that the electromagnetic component generates a magnetic field when energized, and the armature moves closer to the housing under the action of the electromagnetic force, while squeezing the reset component. After power is cut off, the reset component pushes the armature away from the housing until the friction disc abuts against the base plate, and the friction plate stops rotating due to the friction between the armature and the base plate.

[0003] In order to ensure the safety of the brake, a manual release mechanism is usually set on the brake. The manual release mechanism is usually set on the side of the shell away from the base plate. The manual release mechanism needs to have a connecting rod extending into the shell to ensure that the armature is pushed away from the shell.

[0004] In the above-mentioned brake structure, since an armature and a friction disc are provided between the outer shell and the base plate, and the connecting rod needs to maintain a sliding connection with the outer shell when pushing the armature, dust can easily enter the interior of the brake through the gap between the connecting rod and the outer shell during operation. The friction disc is exposed to the outside and has poor dust and water resistance, which reduces the service life of the brake. Utility Model Content

[0005] The embodiment of the utility model provides a closed brake, which aims to solve the technical problems that after a manual release mechanism is set in the existing brake, the connecting rod and the outer shell slide during operation, and dust easily enters the interior of the outer shell through the sliding gap; the friction disk is exposed to the outside and has poor dust and water resistance, thereby reducing the service life of the brake.

[0006] To achieve the above-mentioned object, the present invention adopts a technical solution: providing a closed brake, comprising a housing, a tail plate, an armature, and a friction disc, wherein the tail plate and the armature are located at the same axial end of the housing, and the friction disc is located between the armature and the tail plate, the housing having a central hole extending axially therethrough and annular grooves spaced apart on the outer circumference of the central hole, and the closed brake further comprising:

[0007] an electromagnetic coil disposed in the annular groove;

[0008] The manual release mechanism includes a handle, an intermediate plate and a release column. The handle and the intermediate plate are both located at an axial end of the shell facing away from the tail plate. The two ends of the intermediate plate are respectively assembled with the handle and the release column. The release column slides with the center hole. The release column is used to push the armature to move closer to the friction disk. A first sealing ring is provided between the release column and the inner wall of the center hole.

[0009] In a possible implementation, the outer circumferential surface of the release column is recessed to form a first annular groove, and the first sealing ring is placed in the first groove.

[0010] In a possible implementation, the inner circumferential surface of the central hole is recessed to form a second annular groove, and the first sealing ring is placed in the second groove.

[0011] In one possible implementation, one end of the shell facing the tail plate is recessed to form an accommodating cavity connected to the annular groove, the armature and the friction plate are both located in the accommodating cavity, the tail plate cover is provided at the opening of the accommodating cavity, and a second sealing ring is provided between the tail plate and the shell.

[0012] In a possible implementation, the housing further has a guide groove located on the outer peripheral surface of the accommodating cavity, the guide groove extends along the axial direction of the housing, and the outer periphery of the armature is provided with a guide protrusion that slides in cooperation with the guide groove.

[0013] In a possible implementation, a receiving groove is provided at a position of the housing opposite to the guide protrusion, a buffer is provided in the receiving groove, and the buffer is located between the armature and the housing.

[0014] In a possible implementation, a receiving groove is provided on the housing, the receiving groove is annular and is spaced apart at the outer circumference of the annular groove, a buffer is provided in the receiving groove, and the buffer is located between the armature and the housing.

[0015] In one possible implementation, a ball bearing is provided on one end of the housing facing the handle, a third groove is provided on a side of the intermediate plate facing the housing, and the manual release mechanism further includes a brake spring sleeved around the outer periphery of the release column, the brake spring abutting against a step of the release column, and the brake spring exerting a preload force to push the release column toward the armature.

[0016] The ball has a first state in which it is located in the third groove, and a second state in which it abuts against an end surface of the middle plate facing the housing.

[0017] In one possible implementation, the middle plate is provided with an assembly hole and an oblong sliding hole, the handle and the release column are respectively provided with protrusions that are clearance-matched with the assembly hole, and a limit pin is fixed to the shell, and the limit pin is slidably fitted in the sliding hole.

[0018] In one possible implementation, the enclosed brake also includes a micro switch, which is located on the periphery of the intermediate plate and electrically connected to the electromagnetic coil. The intermediate plate is used to trigger the micro switch when the handle rotates to turn the electromagnetic coil on and off.

[0019] Compared with the prior art, the solution shown in the embodiment of the present application is different from that in the prior art. During operation, since the armature and the friction disc are in the accommodating cavity, the armature will slide along the axial direction of the shell when the electromagnetic coil is energized and de-energized. However, since the tail plate is fixed to the shell and covers the opening of the accommodating cavity, it can be ensured that the armature and the friction disc are always in the accommodating cavity before and after sliding. The accommodating cavity is provided on the shell so that the friction disc is installed in a closed manner, which prevents the friction disc from being exposed to the outside and unable to achieve dust and water resistance, and prevents dust and the like from entering the friction surface of the friction disc and affecting the braking effect. When using the manual release mechanism, the release column is manually driven to slide to push the armature. Since a first sealing ring is provided between the release column and the inner wall of the center hole, dust can be effectively prevented from entering the brake through the movable gap, thereby extending the service life of the brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the main structure of a closed brake provided by an embodiment of the utility model;

[0021] Figure 2 For the Figure 1 Schematic diagram of the cross-section structure along the AA line;

[0022] Figure 3 A schematic diagram of the three-dimensional structure of a closed brake provided in one embodiment of the present utility model (with the handle hidden);

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of a housing used in one embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the armature used in one embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the intermediate plate used in one embodiment of the present utility model;

[0026] Figure 7 This is a schematic diagram of the three-dimensional structure of a handle used in one embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of a release column used in an embodiment of the present utility model;

[0028] Figure 9 A schematic cross-sectional view of a closed brake provided in another embodiment of the present invention;

[0029] Figure 10 A schematic cross-sectional view of a closed brake according to another embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the three-dimensional structure of a shell used in another embodiment of the present utility model.

[0031] Description of reference numerals:

[0032] 10-housing; 11-middle hole; 12-annular groove; 13-accommodating cavity; 14-second groove; 15-guide groove; 16-section; 17-spring hole;

[0033] 20- electromagnetic coil;

[0034] 30-tail board;

[0035] 40-armature; 41-guide protrusion;

[0036] 50-friction disc;

[0037] 60 - manual release mechanism; 61 - handle; 611 - bump; 62 - release column; 63 - first groove; 64 - ball bearing; 65 - middle plate; 651 - assembly hole; 652 - sliding hole; 653 - third groove; 66 - brake spring; 67 - limit pin;

[0038] 70-first sealing ring; 71-second sealing ring; 72-buffer;

[0039] 80-Micro switch. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] In the claims, description and the above-mentioned drawings of the present utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is to distinguish different objects rather than to describe a specific order.

[0042] Unless otherwise expressly defined, the directional words in the claims, specification and the above-mentioned drawings of the present invention, such as the terms "upper", "lower", "top", "bottom", "front", "back", "inside", "outside", "center", "transverse", "longitudinal", "horizontal", "vertical", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0043] In the claims, specification and the above drawings of the present utility model, unless otherwise clearly defined, if the terms "fixed connection" or "fixed connection" are used, they should be understood in a broad sense, that is, any connection method without any displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0044] In the claims, description and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0045] Please also refer to Figures 1 to 11 The enclosed brake provided by the present invention is now described. The enclosed brake comprises a housing 10, an electromagnetic coil 20, a tail plate 30, an armature 40, a friction disc 50, and a manual release mechanism 60. The tail plate 30 and the armature 40 are located at the same axial end of the housing 10, with the friction disc 50 located between the armature 40 and the tail plate 30. The housing 10 has a central hole 11 extending axially therethrough and an annular groove 12 spaced about the periphery of the central hole 11. The electromagnetic coil 20 is disposed within the annular groove 12. The manual release mechanism 60 comprises a handle 61, an intermediate plate 65, and a release post 62. The handle 61 and the intermediate plate 65 are both located at an axial end of the housing 10 facing away from the tail plate 30. The handle 61 and the release post 62 are assembled to the ends of the intermediate plate 65, respectively. The release post 62 slidably engages the central hole 11 and is used to push the armature 40 toward the friction disc 50. A first sealing ring 70 is disposed between the release post 62 and the inner wall of the central hole 11.

[0046] Specifically, one end of the housing 10 facing the tail plate 30 is recessed to form an accommodating cavity 13 communicating with the annular groove 12 . The armature 40 and the friction plate 50 are both located in the accommodating cavity 13 , and the tail plate 30 covers the opening of the accommodating cavity 13 .

[0047] Compared with the prior art, the enclosed brake provided in this embodiment has the following advantages. During operation, since the armature 40 and the friction disc 50 are located in the accommodating chamber 13, when the electromagnetic coil 20 is energized and de-energized, the armature 40 will slide along the axial direction of the housing 10. However, since the tail plate 30 is fixed to the housing 10 and covers the opening of the accommodating chamber 13, it can be ensured that the armature 40 and the friction disc 50 are always located in the accommodating chamber 13 before and after sliding. The accommodating chamber 13 is provided on the housing 10 so that the friction disc 50 is installed in a closed manner, thereby preventing the friction disc 50 from being exposed to the outside and unable to achieve dust and water resistance, and preventing dust and the like from entering the friction surface of the friction disc 50 and affecting the braking effect. When the manual release mechanism 60 is used, the release post 62 is manually driven to slide to push the armature 40. Since a first sealing ring 70 is provided between the release post 62 and the inner wall of the center hole 11, dust can be effectively prevented from entering the brake through the movable gap, thereby extending the service life of the brake.

[0048] In some embodiments, a specific installation method of the first sealing ring 70 can be as follows: Figure 2 See the structure shown. Figure 2 The outer peripheral surface of the release column 62 is recessed to form an annular first groove 63 , and the first sealing ring 70 is placed in the first groove 63 .

[0049] As a modified installation method of the first sealing ring 70, see Figures 9 and 10 The inner circumference of the central hole 11 is recessed to form an annular second groove 14 , and the first sealing ring 70 is placed in the second groove 14 .

[0050] Specifically, the second groove 14 may be spaced apart from an end surface of the housing 10 facing the handle 61 (see Figure 9 ), or an opening may be provided at one end face of the housing 10 facing the handle 61 (see 10 ).

[0051] The first sealing ring 70 can be a rubber ring, such as O-type, star-type, J-type, F-type, etc.; the first sealing ring 70 can also be an oil seal, the inner wall of the oil seal is provided with an elastic sealing lip, and some oil seals also have a supporting spring or a separate main body structure; the sealing ring can also be a Glyer ring, which is composed of a rubber ring and a polytetrafluoroethylene ring. The rubber ring applies force and generates a higher initial contact stress on the sealing surface according to its own deformation, thereby achieving a sealing effect.

[0052] The first sealing ring 70 is installed in the first groove 63 or the second groove 14 and can be customized according to customer needs.

[0053] In some embodiments, an improved embodiment of the above-mentioned enclosed brake can be adopted as follows Figure 2 、 Figure 9 and Figure 10 See the structure shown. Figure 2 、 Figure 9 and Figure 10 A second sealing ring 71 is provided between the tailgate 30 and the housing 10. The second sealing ring 71 can be a sealing gasket (made of paper, plastic, or rubber), a sealant applied to the contact surface between the tailgate 30 and the housing 10, or a rubber ring. When the second sealing ring 71 is a rubber ring, a groove for accommodating the second sealing ring 71 can be provided on the end surface of the housing 10 facing the tailgate 30. After installation, the second sealing ring 71 abuts against the tailgate 30 to achieve a seal.

[0054] In this embodiment, the tail plate 30 and the housing 10 are fixedly connected via a threaded connection. By providing the second sealing ring 71 , the sealing performance of the accommodating cavity 13 can be enhanced to prevent rainwater from entering the accommodating cavity 13 .

[0055] In some embodiments, an improved embodiment of the housing 10 may be as follows: Figure 4 、 Figure 5 and Figure 11 The structure shown. Figure 4 、 Figure 5 and Figure 11 The housing 10 further includes a guide groove 15 located on the outer circumference of the accommodating cavity 13. The guide groove 15 extends axially along the housing 10. The armature 40 is provided with a guide protrusion 41 on its outer circumference, which slidably engages with the guide groove 15. When the electromagnetic coil 20 is energized or de-energized, or when the manual release mechanism 60 is activated, the armature 40 will slide axially along the housing 10. The guide protrusion 41 and the guide groove 15 provide guidance for the armature 40 during its sliding process, preventing it from rotating.

[0056] Specifically, multiple guide grooves 15 are evenly arranged around the axis of the shell 10, and correspondingly, multiple guide protrusions 41 are also arranged. Each guide protrusion 41 slides in a guide groove 15, and the number of guide protrusions 41 can be the same as or different from the number of guide grooves 15.

[0057] In some embodiments, an improved embodiment of the above-mentioned enclosed brake can be adopted as follows Figure 4 The structure shown. Figure 4 The housing 10 is provided with a receiving groove at a position opposite to the guide protrusion 41. A buffer member 72 is provided in the receiving groove. The buffer member 72 is located between the armature 40 and the housing 10. When the electromagnetic coil 20 is energized, the armature 40 and the housing 10 are attracted and collide with each other. During the collision, the buffer member 72 can reduce the noise generated by the brake.

[0058] The receiving grooves in this embodiment can be circular grooves, and multiple grooves can be provided. The multiple receiving grooves can correspond one-to-one with the multiple guide grooves 15 and be located at the bottom of the guide grooves 15. The buffer members 72 correspond one-to-one with the receiving grooves and can be placed directly in the receiving grooves or adhered to the receiving grooves. Optionally, the buffer members 72 can be a buffer sheet (made of paper, plastic, or rubber) adhered to the armature 40 or housing 10, or a shock-absorbing paint applied to the pole surface of the armature 40 or housing 10 (i.e., the contact surface between the housing 10 and the armature 40).

[0059] In addition, another installation form of the buffer member 72 is shown in FIG. Figure 11 The housing 10 is provided with a receiving groove, which is annular and spaced at the outer periphery of the annular groove 12. A buffer member 72 is provided in the receiving groove, and the buffer member 72 is located between the armature 40 and the housing 10. In this embodiment, the buffer member 72 is an O-ring placed in the receiving groove.

[0060] The cross section of the buffer member 72 may be T-shaped or O-shaped, and the buffer member 72 may also be a spring, and the shape of the accommodating groove is adapted to the shape of the buffer member 72 .

[0061] In order to further improve the noise reduction effect, a noise reduction structure can also be set between the armature 40 and the tail plate 30. The noise reduction structure is fixed on the armature 40 or the tail plate 30, and is spaced at the outer periphery of the friction disc 50 without contacting the friction disc 50. It can be used to reduce the noise when the brake releases the armature 40.

[0062] In some embodiments, an improved embodiment of the manual release mechanism 60 can be implemented as follows: Figure 2 、 Figure 6 、 Figure 9 and Figure 10 See the structure shown. Figure 2 、 Figure 6 、 Figure 9 and Figure 10 A ball bearing 64 is provided on one end of the housing 10 facing the handle 61, and a third groove 653 is provided on the side of the intermediate plate 65 facing the housing 10. The manual release mechanism 60 further includes a brake spring 66 sleeved on the outer periphery of the release column 62. The brake spring 66 abuts against the step of the release column 62. The brake spring 66 is located between the first sealing ring 70 and the armature 40. The brake spring 66 has a preload force that pushes the release column 62 to move closer to the armature 40.

[0063] The ball 64 has a first state in which it is located in the third groove 653 , and a second state in which it abuts against an end surface of the middle plate 65 facing the housing 10 .

[0064] It should be noted that the housing 10 further has a spring hole 17 communicating with the central hole 11 , the brake spring 66 is located in the spring hole 17 , and the first sealing ring 70 is spaced apart and located at one end of the brake spring 66 close to the handle 61 .

[0065] When the electromagnetic coil 20 is powered off, the brake spring 66 abuts the armature 40, causing the armature 40 to squeeze the friction disc 50, and the brake is in a braking state. When the armature 40 needs to be released, the handle 61 needs to be rotated, and the handle 61 drives the intermediate plate 65 to rotate, so that the ball 64 on the housing 10 slides out of the third groove 653 and abuts against one end surface of the intermediate plate 65 facing the housing 10. At this time, the distance between the intermediate plate 65 and the housing 10 becomes larger, squeezing the brake spring 66, releasing the post 62 away from the armature 40, and the armature 40 is released. The friction disc 50 can rotate freely. When the braking state needs to be restored, the handle 61 is reversed to make the ball 64 slide into the third groove 653.

[0066] It is easy to imagine that in order to ensure that the brake spring 66 abuts the release column 62 to push the armature 40, steps need to be set in the release column 62 and the middle hole 11, so that the two ends of the brake spring 66 abut the release column 62 and the steps in the middle hole 11 respectively, to achieve compression and relaxation of the brake spring 66 when the release column 62 slides axially along the outer shell 10.

[0067] In this embodiment, by sleevedly arranging the brake spring 66 on the release column 62 , the size of the housing 10 can be reduced in the radial direction compared to the conventional arrangement of the brake spring 66 on the periphery of the electromagnetic coil 20 , thereby achieving a lightweight design of the entire brake.

[0068] For a specific matching method of the middle plate 65 and the handle 61, see Figures 6 to 9 The middle plate 65 is provided with an assembly hole 651, and the handle 61 and the release column 62 are respectively provided with a protrusion 611 that fits with the assembly hole 651. The handle 61, the release column 62 and the middle plate 65 are fixed together with screws. The shape of the assembly hole 651 can be polygonal, tooth-shaped, keyway, etc., which plays the role of positioning guide and assembly anti-mistake.

[0069] In order to facilitate the application of force, the shape of the handle 61 can be a regular shape such as a triangle, square, hexagon, etc., or an irregular shape, and can be customized according to the user's operating habits. The handle 61 of this structure does not need to extend out of the outer surface of the shell 10, and does not affect the installation of a protective cover on the periphery of the brake.

[0070] Specifically, the handle 61 and the release column 62 can be connected by fasteners, clamping, welding, etc. The fasteners can be screws, bolts, rivets, etc., and the number of fasteners can be several.

[0071] In some embodiments, an improved embodiment of the intermediate plate 65 can be as follows Figure 3 and Figure 6 The structure shown. Figure 3 and Figure 6The intermediate plate 65 is provided with an oblong sliding hole 652. A limit pin 67 is fixedly attached to the housing 10 and slidably engages with the sliding hole 652. The long axis of the oblong sliding hole 652 is an arc that coincides with the axial direction of the housing 10. During the rotation of the intermediate plate 65, the limit pin 67 switches position within the sliding hole 652, thereby limiting the rotation angle of the intermediate plate 65, and thus limiting the rotation angle of the handle 61.

[0072] In some embodiments, an improved embodiment of the above-mentioned enclosed brake can be adopted as follows Figure 3 The structure shown. Figure 3 The enclosed brake also includes a micro switch 80, which is located on the periphery of the intermediate plate 65 and is electrically connected to the electromagnetic coil 20. The intermediate plate 65 is used to trigger the micro switch 80 when the handle 61 rotates to realize the on and off of the electromagnetic coil 20.

[0073] When the handle 61 is in the braking position, the middle plate 65 is separated from the micro switch 80, so that the micro switch 80 is energized, and thus the electromagnetic coil 20 is energized; when the handle 61 is in the triggering position, the middle plate 65 contacts the contacts of the micro switch 80, so that the micro switch 80 is disconnected and the electromagnetic coil 20 is de-energized.

[0074] By providing the micro switch 80 , the operation of the handle 61 is linked to the on / off state of the electromagnetic coil 20 , thereby ensuring the safety of the operation.

[0075] Optionally, the brake also has a protective cover (not shown in the figure), which covers the entire brake and exposes the handle 61. In order to facilitate the installation of the protective cover, a section 16 can also be provided on the outer periphery of the shell 10. The section 16 is parallel to the axial direction of the shell 10, so that the lead of the electromagnetic coil 20 can be led out from the section 16 to avoid interference between the lead and the protective cover.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A closed brake comprising a housing, a tail plate, an armature, and a friction disc, wherein the tail plate and the armature are located at the same axial end of the housing, and the friction disc is located between the armature and the tail plate, characterized in that: The housing has a central hole extending axially therethrough and annular grooves spaced apart on the periphery of the central hole. The enclosed brake further comprises: an electromagnetic coil disposed in the annular groove; The manual release mechanism includes a handle, an intermediate plate and a release column. The handle and the intermediate plate are both located at an axial end of the shell facing away from the tail plate. The two ends of the intermediate plate are respectively assembled with the handle and the release column. The release column slides with the center hole. The release column is used to push the armature to move closer to the friction disk. A first sealing ring is provided between the release column and the inner wall of the center hole.

2. The enclosed brake according to claim 1, characterized in that The outer peripheral surface of the release column is recessed to form a first annular groove, and the first sealing ring is placed in the first groove.

3. The enclosed brake according to claim 1, wherein: The inner peripheral surface of the central hole is recessed to form a second annular groove, and the first sealing ring is placed in the second groove.

4. The enclosed brake according to claim 1, wherein: One end of the shell facing the tail plate is recessed to form an accommodating cavity communicated with the annular groove. The armature and the friction plate are both located in the accommodating cavity. The tail plate cover is arranged at the opening of the accommodating cavity. A second sealing ring is provided between the tail plate and the shell.

5. The enclosed brake according to claim 4, characterized in that The shell further comprises a guide groove located on the outer peripheral surface of the accommodating cavity, wherein the guide groove extends along the axial direction of the shell, and the outer periphery of the armature is provided with a guide protrusion which is slidably matched with the guide groove.

6. The enclosed brake according to claim 5, characterized in that An accommodating groove is provided at a position of the shell opposite to the guide protrusion. A buffer is provided in the accommodating groove. The buffer is located between the armature and the shell.

7. The enclosed brake according to claim 4, characterized in that The housing is provided with a receiving groove, which is annular and spaced at the outer periphery of the annular groove. A buffer is provided in the receiving groove, and the buffer is located between the armature and the housing.

8. The enclosed brake according to claim 1, wherein: A ball bearing is provided on one end of the housing facing the handle, and a third groove is provided on the side of the intermediate plate facing the housing. The manual release mechanism further includes a brake spring sleeved on the outer periphery of the release column, the brake spring abutting against the step of the release column, and the brake spring has a pre-tightening force that pushes the release column to move closer to the armature; The ball has a first state in which it is located in the third groove, and a second state in which it abuts against an end surface of the middle plate facing the housing.

9. The enclosed brake according to claim 8, characterized in that The middle plate is provided with an assembly hole and an oblong sliding hole, the handle and the release column are respectively provided with a protrusion that is clearance-matched with the assembly hole, the shell is fixed with a limit pin, and the limit pin is slidably matched with the sliding hole.

10. The enclosed brake according to claim 8, wherein: The enclosed brake also includes a micro switch, which is located on the outer periphery of the intermediate plate and is electrically connected to the electromagnetic coil. The intermediate plate is used to trigger the micro switch when the handle rotates to realize the power on and off of the electromagnetic coil.

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