Electromagnetic brake and electric hoist

Abstract

The utility model discloses an electromagnetic brake and an electric hoist, and relates to the technical field of electromagnetic brake equipment. The electromagnetic brake comprises: a housing, an output shaft, a load-limiting assembly, a brake disc and a connecting sleeve. The housing has a containing cavity, and the containing cavity is located on one side of the housing along a first direction; the output shaft passes through the housing along the first direction; the load-limiting assembly is located in the containing cavity, wherein the load-limiting assembly comprises a load-limiting elastic member and a position-limiting member, and the position-limiting member abuts against the load-limiting elastic member along the first direction; the brake disc abuts against the load-limiting elastic member along the first direction, and is sleeved on the output shaft; the connecting sleeve is sleeved on the output shaft, and is located on the side of the brake disc away from the load-limiting elastic member along the first direction, and the connecting sleeve is used to connect with an external electric hoist, wherein a load-limiting friction plate for frictional cooperation is also used between the connecting sleeve and the brake disc. By adopting the technology provided by the utility model, the load-limiting function of the electromagnetic brake on the electric hoist is realized, and safety accidents caused by overweight are effectively avoided.

Description

Technical Field

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

[0002] The working principle of the crane electric hoist is: the hoisting motor drives the gear transmission to make the drum of the crane electric hoist rotate to lift the heavy object to a certain height, and then the electromagnetic brake is used to brake the heavy object to keep it in the air. However, if the electric hoist is overloaded, that is, when the rotation torque of the hoisting motor is at the limit, the torque attenuation caused by the heating of the hoisting motor will cause the heavy object to fall.

[0003] Based on this, electric hoists are all equipped with overload limiters, the main types of which include electrical overload limiters and mechanical overload limiters.

[0004] The electrical overload limiter is generally composed of two parts: a controller and a force sensor. Its working principle is: when the weight of the object lifted by the electric hoist is detected by the force sensor, the controller compares the load with the preset rated load. If there is an overload (for example, reaching 105% of the rated load), the relay is immediately limited to operate and the crane's rising contact power supply is cut off to prevent the crane from operating in an unsafe direction.

[0005] However, the electrical overload limiter has high requirements on the structure and installation position of the force sensor. The force sensors currently used can be roughly divided into four categories: S-shaped sensors, plate ring pull sensors, shaft pin sensors, and side pressure sensors. Among them, the S-shaped sensor and the plate ring pull sensor need to disconnect the wire rope at the fixed end of the electric hoist and then connect it to the force sensor; the shaft pin sensor is only suitable for electric hoists with fixed pulleys; and the side pressure sensor is too expensive.

[0006] Mechanical overload limiters are generally composed of force measuring rings, pins, wedge joints or pulleys. When the hoisting load exceeds the rated load, the limit switch is triggered, making the electric hoist unable to perform the ascending action, thereby playing the role of overload limitation. However, the current mechanical overload limiters generally have the disadvantages of large size and heavy weight. Utility Model Content

[0007] The utility model provides an electromagnetic brake to solve the problems in the prior art that the force sensor of the electric overload limiter has high requirements and the volume of the mechanical overload limiter is too large.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is to provide an electromagnetic brake, which includes: a housing, an output shaft, a load limiting component, a brake disc and a connecting sleeve.

[0009] The housing has a containing cavity, and the containing cavity is located at one side of the housing along the first direction; the output shaft passes through the housing along the first direction; the load limiting component is located in the containing cavity, wherein the load limiting component includes a load limiting elastic member and a limiting member, and the limiting member abuts against the load limiting elastic member along the first direction;

[0010] The brake disc abuts against the load-limiting elastic part along the first direction and is sleeved on the output shaft; the connecting sleeve is sleeved on the output shaft and is located on the side of the brake disc away from the load-limiting elastic part along the first direction, and the connecting sleeve is used to connect with an external electric hoist, wherein a load-limiting friction plate is also used for friction fit between the connecting sleeve and the brake disc.

[0011] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0012] By adding a brake disc and a load-limiting adjustment device on one side of the output shaft, the output torque of the output shaft can be effectively controlled, so that the brake can have a load-limiting function. Its working principle is: when the load-limiting elastic member in the load-limiting assembly is in a compressed state (the limiter and the brake disc respectively abut the load-limiting elastic member), it has pressure toward the brake disc, and the load-limiting friction plate generates friction force on the brake disc and the connecting sleeve located on both sides of the load-limiting friction plate under this pressure. This friction force generates a transmission torque between the brake disc and the connecting sleeve.

[0013] In some application scenarios, the connecting sleeve is connected to an external electric hoist, and the motor rotor of the electric hoist drives the connecting sleeve to rotate. Due to the pressure of the load-limiting elastic member and the load-limiting friction plate, there is a friction torque between the connecting sleeve and the brake disc. When the load is not overweight, the friction torque enables the brake disc to drive the output shaft to rotate with the connecting sleeve; when the load is overweight, that is, the friction torque cannot withstand the overweight load, slippage occurs between the brake disc and the connecting sleeve, and the brake disc and the output shaft no longer rotate with the motor rotor. It effectively avoids lifting overweight objects into the air and the risk of falling.

[0014] In some embodiments, the limiting member also includes a pressure cover and a pressure cover locking member, wherein the pressure cover is located on the side of the load-limiting elastic member away from the brake disc along the first direction and is capable of pressing against the load-limiting elastic member; the pressure cover locking member is used to adjust the degree of pressure between the pressure cover and the load-limiting elastic member, wherein the pressure cover locking member is connected to the output shaft.

[0015] By adopting the above technical solution, the compression degree of the load-limiting elastic member is adjusted by locking the pressure cover with the pressure cover locking member, that is, the friction torque of the load-limiting friction plate is controlled by adjusting the pressing force of the load-limiting elastic member, so as to achieve the maximum load capacity of the preset electromagnetic brake.

[0016] In some embodiments, the output shaft and the brake disc are keyed.

[0017] With the above technical solution, the output shaft and the brake disc are also provided with keyways correspondingly, and the same flat key is embedded in the keyways of the output shaft and the brake disc. The flat key transmits torque by squeezing the side of the keyway, and the connection between the output shaft and the brake disc is set to a flat key connection, which can effectively transmit the rotational torque of the brake disc to the output shaft to brake the output shaft.

[0018] In some embodiments, the inner side ring of the connecting sleeve along the second direction is provided with a plurality of slots, and the slots are used to connect with the external electric hoist.

[0019] By adopting the above technical solution, the connecting sleeve is provided with a slot to connect with the external motor rotor, so that the rotational torque of the external motor rotor is transmitted to the electromagnetic brake via the connecting sleeve.

[0020] In some embodiments, the electromagnetic brake further includes: an electromagnetic assembly, a braking elastic member, and a braking friction group.

[0021] The electromagnetic assembly is arranged in a ring around the accommodating cavity, and an armature plate is arranged on one side facing the friction disc; the braking elastic member abuts against the armature plate along the first direction.

[0022] The brake friction group includes a friction disc and a brake friction pad group, and the friction disc is sleeved on the outer ring of the brake disc along the second direction; the brake friction pad group includes a first brake friction pad and a second brake friction pad, and the first brake friction pad and the second brake friction pad are respectively located on both sides of the friction disc along the first direction, wherein the first brake friction pad is in contact with the armature plate.

[0023] With the above technical solution, when the brake elastic member is in a compressed state, it has a pressing force toward the armature plate. Since a first brake friction pad is arranged between the armature plate and the friction disc, the first brake friction pad generates a friction torque under the pressure of the armature plate and the brake elastic member.

[0024] That is, the braking principle of the above structure is: when the electromagnetic assembly is in a power-on state, the armature plate moves toward the electromagnetic assembly under the electromagnetic force field generated by the electromagnetic assembly. At this time, the first brake friction pad between the armature plate and the friction disc fails, allowing the friction disc to rotate with the external motor rotor; when the electromagnetic assembly is in a power-off state, the armature plate is subjected to the resistance pressure of the brake elastic part and causes the first brake friction pad located between the friction disc and the armature plate to generate a braking torque, which is then transmitted from the friction disc to the brake disc and the output shaft in sequence, thereby achieving load braking.

[0025] In some embodiments, the friction disc and the brake disc are provided with circular grooves correspondingly along the second direction, and the same beads are embedded in the circular grooves of the friction disc and the brake disc.

[0026] By adopting the above technical solution, the steel balls serve as the force transmission medium between the friction disc and the brake disc, which can withstand the large impact force between the friction disc and the brake disc, and can reduce wear and heat generation under the state of high-speed friction between the brake disc and the friction disc.

[0027] In some embodiments, the friction disc is provided with annular grooves on both sides along the first direction, and the first brake friction pad and the second brake friction pad are respectively embedded in the annular grooves; the annular grooves are connected to the circular grooves.

[0028] In some embodiments, the housing includes a mounting end cap and a mounting plate, and the mounting plate is located below the mounting end cap along the first direction.

[0029] By adopting the above technical solution, conventional mounting end covers are mostly made of aluminum alloy and are not wear-resistant, while a second brake friction pad is provided on the side of the friction disc close to the mounting end cover. Adding a mounting plate between the mounting end cover and the second brake friction pad can effectively improve the life of the equipment.

[0030] In some embodiments, the housing is further embedded with a plurality of bolts penetrating the armature plate along the first direction, and the bolt outer sleeves are provided with contour ring washers.

[0031] By adopting the above technical solution, an air gap can be provided for the electromagnetic brake by arranging a contour ring gasket on the outer sleeve of the bolt. When the electromagnetic assembly is not energized, the air gap is located between the armature plate and the electromagnetic assembly along a first direction, and the friction disc and the brake disc are in a braking state at this time; when the electromagnetic assembly is energized, the air gap can be transferred to between the friction disc and the brake disc, so that the friction disc and the brake disc can rotate.

[0032] In some embodiments, the present application also provides an electric hoist, which includes the above-mentioned electromagnetic brake and a motor rotor, wherein the motor rotor is provided with a hollow cavity, the output shaft of the electromagnetic brake is at least partially embedded in the hollow cavity, and the motor rotor is connected to the connecting sleeve of the electromagnetic brake.

[0033] By adopting the above technical solution, the output shaft and the motor rotor are fixed by the load limiting component of the electromagnetic brake, and the maximum load of the motor rotor can be limited by adjusting the output torque of the load limiting component. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, among which:

[0035] Figure 1 This is a cross-sectional view of an embodiment of an electromagnetic brake provided by the utility model Figure 1 ;

[0036] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of an electromagnetic brake provided by the utility model;

[0037] Figure 3 It is an exploded schematic diagram of an embodiment of an electromagnetic brake provided by the utility model;

[0038] Figure 4 It is a three-dimensional structural schematic diagram of an embodiment of a brake disc of an electromagnetic brake provided by the utility model;

[0039] Figure 5 This is a schematic diagram of the connection structure of a brake disc and a friction disc of an electromagnetic brake provided by the utility model;

[0040] Figure 6 It is a three-dimensional structural schematic diagram of an embodiment of a connecting sleeve of an electromagnetic brake provided by the utility model;

[0041] Figure 7 This is a three-dimensional structural diagram of an embodiment of an electromagnetic brake provided by the utility model Figure 2 ;

[0042] Figure 8 This is a cross-sectional view of an embodiment of an electromagnetic brake provided by the utility model Figure 2 ;

[0043] Fig. 9 It is a partial structural sectional view of an embodiment of an electric hoist provided by the utility model.

[0044] In the figure:

[0045] Shell—10; accommodating cavity—11; mounting end cover—12; mounting plate—13; bolt—14; contour ring gasket—15; output shaft—20; flat key—21;

[0046] Load limiting assembly—30; load limiting elastic member—31; gland—32; gland locking member—33; brake disc—40; keyway—41; circular groove—42; bead—43;

[0047] Connecting sleeve—50; load-limiting friction plate—51; slot—52; bearing—53; electromagnetic assembly—60; armature plate—61; electromagnetic coil—62; electromagnetic core—63; brake elastic member—70;

[0048] Braking friction group 80; friction disc 81; annular groove 810; braking friction group 82; first braking friction pad 820; second braking friction pad 821; motor rotor 90; sliding bearing 91. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0050] For the convenience of subsequent description, before describing the specific structure of the electromagnetic brake and the electric hoist, this application first combines Figure 1 A first direction (Z) and a second direction (O) are defined, wherein the first direction is the height direction of the electromagnetic brake when it is normally placed, such as the Z direction; and the second direction is the radius direction of the electromagnetic brake when it is normally placed, such as the O direction.

[0051] See also Figures 1 to 3 As shown, Figure 1 A cross-sectional view of an embodiment of an electromagnetic brake provided by the present application is shown. Figure 1 ; Figure 2 A three-dimensional structural schematic diagram of an embodiment of an electromagnetic brake provided by the present application is shown; Figure 3 An exploded schematic diagram of an embodiment of an electromagnetic brake provided by the present application is shown.

[0052] In some embodiments, the electromagnetic brake includes: a housing 10 , an output shaft 20 , a load limiting assembly 30 , a brake disc 40 and a connecting sleeve 50 .

[0053] The shell 10 has a accommodating cavity 11, which is located on one side of the shell 10 along the first direction; the output shaft 20 passes through the shell 10 along the first direction; the load limiting component 30 is located in the accommodating cavity 11, wherein the load limiting component 30 includes a load limiting elastic member 31 and a limiting member, and the limiting member abuts against the load limiting elastic member 31 along the first direction.

[0054] The brake disc 40 abuts against the load-limiting elastic member 31 along the first direction and is sleeved on the output shaft 20; the connecting sleeve 50 is sleeved on the output shaft 20 and is located on the side of the brake disc 40 away from the load-limiting elastic member 31 along the first direction. The connecting sleeve 50 is used to connect to an external electric hoist, wherein a load-limiting friction plate 51 for friction fit is also provided between the connecting sleeve 50 and the brake disc 40.

[0055] In the embodiment of the present application, by adding a brake disc 40 and a load limiting adjustment device on one side of the output shaft 20, the output torque of the output shaft 20 can be effectively controlled, so that the brake can have a load limiting function. Its working principle is: when the load limiting elastic member 31 in the load limiting assembly 30 is in a compressed state, the limiter and the brake disc 40 respectively abut against the load limiting elastic member 31, and the load limiting elastic member 31 has a pressure toward the brake disc 40. Under this pressure, the load limiting friction plate 51 generates friction force on the brake disc 40 and the connecting sleeve 50 located on both sides of the load limiting friction plate 51. The friction force generates a transmission torque between the brake disc 40 and the connecting sleeve 50.

[0056] In some application scenarios, the motor rotor of the electric hoist drives the connecting sleeve 50 to rotate. Due to the pressure of the load-limiting elastic member 31 and the load-limiting friction plate 51, there is a friction torque between the connecting sleeve 50 and the brake disc 40. When the load is not overweight (the friction torque is sufficient to bear the load), the friction torque enables the brake disc 40 to drive the output shaft 20 to rotate with the connecting sleeve 50; when the load is overweight, that is, the friction torque cannot bear the overweight load, the brake disc 40 and the connecting sleeve 50 slip, and then the brake disc 40 and the output shaft 20 no longer rotate with the motor rotor. It effectively avoids lifting overweight objects into the air and the risk of falling.

[0057] Exemplarily, the load-limiting elastic member 31 can be a single spring, which is sleeved on the outer periphery of the output shaft 20; however, the present application does not limit the load-limiting elastic member 31. For example, elastic components such as multiple springs can be arranged in the accommodating space to provide a first direction resistance force for the brake disc 40.

[0058] In some embodiments, the limiting member also includes a pressure cover 32 and a pressure cover locking member 33. The pressure cover 32 is located on the side of the load-limiting elastic member 31 away from the brake disc 40 along the first direction and can press the load-limiting elastic member 31. The pressure cover locking member 33 is used to adjust the degree of pressure between the pressure cover 32 and the load-limiting elastic member 31.

[0059] In the embodiment of the present application, the compression degree of the load-limiting elastic member 31 is adjusted by locking the gland 32 with the gland locking member 33. For example, the gland locking member 33 is a locking nut. Before the electric hoist is operated, the locking degree of the gland locking member 33 is adjusted and controlled by a torque wrench, etc., and the position of the gland 32 is fixed. That is, the compression force of the load-limiting elastic member 31 is adjusted to control the friction torque of the load-limiting friction plate 51, so that the maximum load of the preset electromagnetic brake can be achieved.

[0060] Specifically, the closer the pressure cover 32 fixed by the pressure cover locking member 33 is to the brake disc 40, the greater the compression of the load limiting elastic member 31, that is, the greater the transmission torque that the load limiting friction plate 51 can generate, so that when the output shaft 20 is connected to the load, the load capacity of the output shaft 20 is also greater.

[0061] In some embodiments, the electromagnetic brake further includes: an electromagnetic assembly 60 , a braking elastic member 70 and a braking friction group 80 .

[0062] The electromagnetic assembly 60 is further disposed in the accommodating cavity 11 , and an armature plate 61 is disposed on a side facing the friction disc 81 ; the brake elastic member 70 abuts against the armature plate 61 along a first direction.

[0063] The brake friction group 80 includes a friction disc 81 and a brake friction pad group 82, and the friction disc 81 is sleeved on the outer ring of the brake disc 40 along the second direction; the brake friction pad group 82 includes a first brake friction pad 820 and a second brake friction pad 821, and the first brake friction pad 820 and the second brake friction pad 821 are respectively located on both sides of the friction disc 81 along the first direction, wherein the first brake friction pad 820 abuts against the armature plate 61.

[0064] In the embodiment of the present application, when the brake elastic member 70 is in a compressed state, it has a pressing force toward the armature plate 61. Since a first brake friction pad 820 is provided between the armature plate 61 and the friction disk 81, the first brake friction pad 820 generates a friction torque under the pressure of the armature plate 61 and the brake elastic member 70. The brake elastic member 70 is, for example, a spring, Figure 3 As shown, the spring can be provided in plurality, and the present application does not limit the number of the braking elastic members 70 , for example, 4 or 8.

[0065] The braking principle of the above structure is: when the electromagnetic assembly 60 is in the power-on state, the armature plate 61 moves toward the electromagnetic assembly 60 under the electromagnetic force field generated by the electromagnetic assembly 60, and the first brake friction pad 820 between the armature plate 61 and the friction disk 81 fails, so that the friction disk 81 can rotate with the external motor rotor; when the electromagnetic assembly 60 is in the power-off state, the armature plate 61 is subjected to the pressure of the brake elastic member 70 and the first brake friction pad 820 between the friction disk 81 and the armature plate 61 generates a braking torque, which is then transmitted to the brake disk 40 and the output shaft 20 in sequence by the friction disk 81 to achieve load braking. Exemplarily, the electromagnetic assembly 60 includes an electromagnetic coil 62 and an electromagnetic core 63.

[0066] Combination Figure 4 As shown, Figure 4 A three-dimensional structural schematic diagram of an embodiment of a brake disc 40 of an electromagnetic brake provided in the present application is shown.

[0067] In some embodiments, the output shaft 20 and the brake disc 40 are keyed.

[0068] In the present application embodiment, combined Figure 1 and Figure 3 As shown, the output shaft 20 and the brake disc 40 are also provided with key slots 41 correspondingly, and the same flat key 21 is embedded in the key slots 41 of the output shaft 20 and the brake disc 40. The flat key 21 transmits torque by squeezing the side of the key slot 41. The connection between the output shaft 20 and the brake disc 40 is set to be connected with the flat key 21, which can effectively transmit the rotational torque of the brake disc 40 to the output shaft 20 to brake the output shaft 20.

[0069] See also Figure 5 As shown, Figure 5 A schematic diagram of the connection structure of a brake disc 40 and a friction disc 81 of an electromagnetic brake provided by the present application is shown.

[0070] In some embodiments, the friction disc 81 and the brake disc 40 are correspondingly provided with circular grooves 42 along the second direction, and the same beads 43 are embedded in the circular grooves 42 of the friction disc 81 and the brake disc 40 .

[0071] In the embodiment of the present application, the circular groove 42 of the friction disc 81 and the brake disc 40 are arranged correspondingly and can be combined into a notch for accommodating the bead 43. For example, the bead 43 is a steel ball and is circumferentially arranged on the brake disc 40. The steel ball serves as a force transmission medium between the friction disc 81 and the brake disc 40, can withstand a large impact force between the friction disc 81 and the brake disc 40, and can reduce wear and heat generation under high-speed friction between the brake disc 40 and the friction disc 81.

[0072] In some embodiments, in combination Figure 5As shown, annular grooves 810 are provided on both sides of the friction disc 81 along the first direction, and the first brake friction pad 820 and the second brake friction pad 821 are respectively embedded in the annular grooves 810 .

[0073] Exemplarily, the annular groove 810 is connected to the circular groove 42 .

[0074] See also Figure 6 As shown, Figure 6 A three-dimensional structural schematic diagram of an embodiment of a connecting sleeve 50 of an electromagnetic brake provided in the present application is shown.

[0075] In some embodiments, the inner side ring of the connecting sleeve 50 along the second direction is provided with a plurality of slots 52 , and the slots 52 are used for connecting with an external electric hoist.

[0076] In the embodiment of the present application, the connecting sleeve 50 is provided with a slot 52 to connect with the motor rotor of the external electric hoist, so that the rotational torque of the external motor rotor is transmitted to the electromagnetic brake via the connecting sleeve 50. Exemplarily, the outer ring side of the connecting sleeve 50 along the second direction is further provided with a bearing 53, which can be a deep groove ball bearing 53 for bearing the load in the second direction.

[0077] See also Figures 7 and 8 As shown, Figure 7 The three-dimensional structure diagram of an embodiment of an electromagnetic brake provided by the present application is shown in FIG. Figure 2 ; Figure 8 A cross-sectional view of an embodiment of an electromagnetic brake provided by the present application is shown. Figure 2 .

[0078] In some embodiments, the housing 10 includes a mounting end cover 12 and a mounting plate 13 , wherein the mounting plate 13 is located below the mounting end cover 12 along the first direction.

[0079] In the embodiment of the present application, the conventional mounting end cover 12 is mostly made of aluminum alloy and is not wear-resistant, while the second brake friction pad 821 is provided on the side of the friction disc 81 close to the mounting end cover 12. Adding a mounting plate 13 between the mounting end cover 12 and the second brake friction pad 821 can effectively improve the life of the equipment. By way of example, the mounting plate 13 is made of wear-resistant steel.

[0080] In some embodiments, in combination Figure 8 As shown, the housing 10 is further embedded with a plurality of bolts 14 penetrating the armature plate 61 along a first direction, and the bolts 14 are outer-circuited with a contour ring washer 15 .

[0081] In the embodiment of the present application, an air gap can be provided for the electromagnetic brake by arranging a contour ring gasket 15 outside the bolt 14. When the electromagnetic assembly 60 is not energized, the air gap is located between the armature plate 61 and the electromagnetic assembly 60 along a first direction, and at this time the friction disc 81 and the brake disc 40 are in a braking state; when the electromagnetic assembly 60 is energized, the air gap can be transferred to between the friction disc 81 and the brake disc 40, so that the friction disc 81 and the brake disc 40 can rotate.

[0082] For example, in combination Figure 3 As shown, the contour ring pads 15 are provided in plurality, for example Figure 3 The 3 shown in .

[0083] See also Fig. 9 As shown, Fig. 9 A partial structural cross-sectional view of an embodiment of an electric hoist provided by the present application is shown.

[0084] In some embodiments, the present application also provides an electric hoist, which includes the above-mentioned electromagnetic brake and a motor rotor 90, wherein the motor rotor 90 is provided with a hollow cavity, and the output shaft 20 of the electromagnetic brake is at least partially embedded in the hollow cavity, and the motor rotor 90 is connected to the connecting sleeve 50 of the electromagnetic brake.

[0085] In the embodiment of the present application, the output shaft 20 and the motor rotor 90 are fixed by the load limiting component 30 of the electromagnetic brake, and the maximum load of the motor rotor 90 can be limited by adjusting the output torque of the load limiting component 30 .

[0086] Exemplarily, when the motor rotor 90 is connected to the connecting sleeve 50, it penetrates through the clamping groove 52 of the connecting sleeve 50. Wherein, a sliding bearing 91 is provided on the inner ring side of the connecting sleeve 50 along the second direction.

[0087] The above description is only an implementation method of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present utility model, or directly or indirectly used in other related technical fields, should be included in the protection scope of the present utility model.

Claims

1. An electromagnetic brake, characterized in that: include: A housing, wherein the housing has a receiving cavity, and the receiving cavity is located at one side of the housing along a first direction; An output shaft, wherein the output shaft penetrates the housing along a first direction; A load limiting component, the load limiting component is located in the accommodating cavity, wherein the load limiting component comprises a load limiting elastic member and a limiting member, and the limiting member abuts against the load limiting elastic member along the first direction; a brake disc, the brake disc abutting against the load-limiting elastic member along the first direction and sleeved on the output shaft; A connecting sleeve is sleeved on the output shaft and is located on the side of the brake disc away from the load-limiting elastic member along the first direction. The connecting sleeve is used to connect to an external electric hoist, wherein a load-limiting friction plate is also used for friction fit between the connecting sleeve and the brake disc.

2. The electromagnetic brake according to claim 1, characterized in that The limiting member also includes a pressure cover and a pressure cover locking member, wherein the pressure cover is located on the side of the load-limiting elastic member away from the brake disc along the first direction and can press against the load-limiting elastic member; the pressure cover locking member is used to adjust the degree of pressure between the pressure cover and the load-limiting elastic member, wherein the pressure cover locking member is connected to the output shaft.

3. The electromagnetic brake according to claim 1, characterized in that The output shaft is key-connected with the brake disc.

4. The electromagnetic brake according to claim 1, characterized in that The inner side ring of the connecting sleeve along the second direction is provided with a plurality of slots, and the slots are used to connect with the external electric hoist.

5. The electromagnetic brake according to claim 1, characterized in that The electromagnetic brake also includes: An electromagnetic assembly, the electromagnetic assembly is arranged in a ring around the accommodating cavity and is provided with an armature plate on one side facing the friction disc; a braking elastic member, the braking elastic member abutting against the armature plate along the first direction; A brake friction group, wherein the brake friction group includes the friction disc and a brake friction pad group, wherein the friction disc is sleeved on the outer ring of the brake disc along the second direction; the brake friction pad group includes a first brake friction pad and a second brake friction pad, wherein the first brake friction pad and the second brake friction pad are respectively located on both sides of the friction disc along the first direction, wherein the first brake friction pad abuts against the armature plate.

6. The electromagnetic brake according to claim 5, characterized in that The friction disc and the brake disc are correspondingly provided with circular grooves along the second direction, and the same bead is embedded in the circular grooves of the friction disc and the brake disc.

7. The electromagnetic brake according to claim 1 or 6, characterized in that: Annular grooves are arranged on both sides of the friction disc along the first direction, and the first brake friction pad and the second brake friction pad are respectively embedded in the annular grooves.

8. The electromagnetic brake according to claim 1, characterized in that The housing includes a mounting end cover and a mounting plate, and the mounting plate is located below the mounting end cover along the first direction.

9. The electromagnetic brake according to claim 1, characterized in that The housing is also embedded with a plurality of bolts penetrating the armature plate along the first direction, and the bolt outer sleeves are provided with equal-height ring washers.

10. An electric hoist, characterized in that: The electromagnetic brake according to any one of claims 1 to 9 further comprises: The motor rotor is provided with a hollow cavity, and the output shaft of the electromagnetic brake is at least partially The motor is separately embedded in the hollow cavity, and the motor rotor is connected to the connecting sleeve of the electromagnetic brake.

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