Motor braking device and motor having the same

Abstract

The present invention relates to the field of motor structure, and in particular to a motor brake device and a motor with the device. The brake device comprises a fixed ring, a rotating cylinder, a connecting rod, a swing rod, a gear, a rack and an electromagnet. The fixed ring is connected and fixed to the rear end cover of the motor, and the fixed ring and the rotor of the motor are coaxial. A plurality of rotating cylinders are distributed around the circumference of the fixed ring, each rotating cylinder is sleeved outside the fixed ring, and each rotating cylinder is restricted to rotate only relative to the fixed ring through the connection of the connecting shaft. The connecting rod and the swing rod are used to connect two adjacent rotating cylinders, so that when one of the rotating cylinders rotates, each rotating cylinder can be driven to rotate in sequence through each connecting rod and the swing rod. When the motor is powered off, the electromagnet loses the magnetic force of adsorbing the rack at the same time, so that the spring pushes the rack to move and drives the gear to rotate while driving the rotating cylinder to rotate, and drives each swing rod to swing through each connecting rod, so that each swing rod swings until each brake pad presses against the rotor of the motor to achieve rapid braking.

Description

Technical Field

[0001] The invention relates to the field of motor structures, and in particular to a motor braking device and a motor having the same. Background Art

[0002] With the development of the automation industry, brake motors are widely used in various industries because they can achieve rapid braking. For example, brake motors can stop machines quickly, shorten the time for speed reduction, and reduce production downtime. Brake motors can also brake quickly in an emergency to prevent equipment from continuing to operate and causing equipment damage or personal injury. Currently, brake motors generally generate braking force on the motor shaft through the friction between the brake ring and the motor's rotor. When the motor is powered off, the braking force applied by the brake ring to the rotor can prevent the motor shaft from continuing to rotate under the force of inertia, thereby achieving rapid braking of the motor shaft.

[0003] However, most existing brake rings are complete rings and are mostly made of plastic materials with limited elasticity. The variable of elastic compression is limited, and the diameter range of the motor rotor that can be braked is small, so the versatility is low. Summary of the invention

[0004] In view of the deficiencies of the above background technology, the present invention provides a motor braking device and a motor having the same.

[0005] The present invention adopts the following technical solution:

[0006] In a first aspect, the present invention discloses a motor braking device, the braking device comprising:

[0007] A fixing ring, wherein the fixing ring is fixed in the motor, and the fixing ring and the rotor of the motor are coaxial;

[0008] A rotating cylinder, the rotating cylinder is sleeved outside the fixing ring, and a plurality of the rotating cylinders are distributed around the circumference of the fixing ring, and each of the rotating cylinders is restricted to rotate only relative to the fixing ring;

[0009] A connecting rod, the connecting rod is bent into an L shape, one end of the connecting rod is pivotally connected to the rotating cylinder, the other end of the connecting rod is fixed with a connecting pin, and both ends of the same side of the rotating cylinder are pivotally connected to the connecting rod;

[0010] A swing rod, the connecting pins of the two connecting rods close to each other of the two adjacent rotating cylinders are connected to the same swing rod, waist-shaped holes are arranged at both ends of the swing rod, the connecting pins of the two connecting rods are respectively adapted to pass through the waist-shaped holes at both ends of the swing rod, and the brake pad is fixed on the side of the swing rod facing away from the connecting rod;

[0011] Gear and rack, wherein the gear is fixed on one side of the rotating cylinder, the rack is meshed with the gear, one end of the rack is connected to a spring, the elastic force of the spring stretching forms a thrust to push the rack to move, so that the gear rotates to drive the rotating cylinder to rotate, and the connecting rod drives the swing arm to swing until the brake pad presses against the rotor of the motor;

[0012] The electromagnet, when energized, forms a magnetic force to attract the rack to move, compress the spring, and simultaneously rotate the gear to drive the rotating cylinder to rotate, and drive the swing arm to swing through the connecting rod until the brake pad leaves the rotor of the motor.

[0013] In a possible implementation, the braking device also includes a connecting shaft, each of the rotating cylinders is connected to a connecting shaft, the connecting shaft is fixed to the outside of the fixing ring, and bearings are fixed at both ends of the connecting shaft, and the rotating cylinder is adapted to fit outside the bearings at both ends of the connecting shaft.

[0014] In a possible implementation, the fixing ring is provided with a notch, and the connecting shaft is provided with mounting holes passing through both ends, the perforation path of the mounting holes is an arc adapted to the diameter of the fixing ring, and after the connecting shaft is placed in the notch, the mounting holes are adapted to fit outside the fixing ring.

[0015] In a possible implementation, the rotating cylinder is cut from the middle to form two equal shells, the two shells are connected and fixed by screws to form the rotating cylinder, and the two shells cover the connecting shaft and the outer rings of the bearings at both ends of the connecting shaft.

[0016] In a possible implementation, the braking device also includes a fixing seat, which is fixed in the motor, and a plurality of bosses are distributed in a circular array on a side of the fixing seat that is opposite to the side fixed to the motor, and a recessed placement groove is provided on the end face of each boss, and the fixing ring is embedded in and fixed to the placement groove of each boss, so that each boss is respectively located between two adjacent connecting shafts, and the side of the boss blocks the end face of the connecting shaft.

[0017] In one possible implementation, the rack is fixed to a movable seat, the movable seat is provided with guide holes passing through both ends, a guide rod is fixed inside the motor, the guide rod passes through the guide hole, and the spring is sleeved outside the guide rod so that the two ends of the spring are respectively against the inner wall of the motor and the movable seat.

[0018] In a possible implementation, the brake pad is adapted to be screwed to a first bolt, and a stud of the first bolt passes through the swing arm and the brake pad to be screwed to be fastened.

[0019] In a second aspect, the present invention discloses a motor having the above-mentioned braking device, the motor comprising a rear end cover and a rotor, the rotor penetrates into the rear end cover, and the fixing ring, the rack and the electromagnet are all arranged in the rear end cover.

[0020] In a possible implementation, the rotor fixes the brake disc, and when the electromagnet loses power and loses the magnetic force for adsorbing the rack, the spring pushes the rack to move, driving the rocker arm to swing and driving the brake pad to press against the brake disc.

[0021] In one possible implementation, the rotor fixes the brake disc, a raised blocking portion is provided at one end of the brake disc annular surface, a brake ring is provided on the brake disc outer cover, the brake ring is attached to the blocking portion, and the brake ring and the blocking portion are fixedly connected, and when the electromagnet loses power and loses the magnetic force to attract the rack, the spring pushes the rack to move, driving the rocker arm to swing and driving the brake pad to press against the brake disc.

[0022] From the above description of the structure of the present invention, it can be seen that compared with the prior art, the present invention has the following advantages: the present invention utilizes the electromagnet to be energized at the same time as the motor is powered on to form a magnetic force that attracts the rack to move, thereby driving the gear to rotate and the rotating cylinder to rotate at the same time, and the rotation of the rotating cylinder drives the connecting rods and the swing rods to swing, and the swing rods swing until the brake pads leave the rotor of the motor, so that the rotor can rotate. When the motor is powered off, the electromagnet loses power at the same time and loses the magnetic force that attracts the moving seat, so that the elastic force of the spring stretching forms a thrust to push the moving seat and the rack to move, thereby driving the gear to rotate and the rotating cylinder to rotate, and driving the swing rods to swing through the connecting rods, and the swing rods swing until the brake pads press against the rotor of the motor to achieve rapid braking. This braking process relies on the thrust formed by the spring to push the swing rod to swing relative to the rotor of the fixed ring until the rotor is pressed tightly to achieve braking. During the process, the diameter of each brake pad enclosed by the swing rod relative to the rotor changes greatly, so it can be applied to the braking of rotors of various diameters, and has high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the braking device of the present invention.

[0024] Figure 2 for Figure 1 A is an enlarged schematic diagram.

[0025] Figure 3 for Figure 1 Schematic diagram of the enlarged view at B.

[0026] Figure 4 It is a cross-sectional schematic diagram of the fixing ring connecting the fixing seat and each rotating cylinder.

[0027] Figure 5 for Figure 4 Enlarged schematic diagram at C in the middle.

[0028] Figure 6 It is a schematic diagram of the rotating cylinder sleeve outside the connecting shaft.

[0029] Figure 7 It is a schematic diagram of the fixing base being fixed in the rear end cover of the motor.

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure after each rocker arm swings downward to press against the rotor.

[0031] Fig. 9 It is a schematic diagram of the three-dimensional structure after each swing rod swings upward and leaves the rotor.

[0032] Fig.10 It is a three-dimensional structural schematic diagram of the position of the movable seat arranged on the guide rod relative to the electromagnet.

[0033] Fig.11 It is a schematic diagram of the three-dimensional structure of the mobile seat.

[0034] Fig.12 It is a schematic diagram of the three-dimensional structure of the rotor external fixed brake ring in the motor of the present invention.

[0035] Fig.13 It is a schematic cross-sectional structure diagram of the motor of the present invention after each swing rod swings until the brake pad presses against the brake ring.

[0036] Fig.14 for Fig.13 The enlarged schematic diagram at D in the middle.

[0037] Fig.15 for Fig.13 Schematic diagram of the enlarged view at E in the middle.

[0038] Fig.16 It is a schematic cross-sectional structure diagram of the motor of the present invention after each swing rod swings until the brake pad leaves the brake ring.

[0039] Fig.17 for Fig.16 Enlarged schematic diagram at F in the middle. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0041] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0042] In addition, in the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0043] The present invention discloses a motor braking device, as shown in the attached Figures 1 to 4 As shown, the braking device includes a fixed ring 1, a rotating cylinder 2, a connecting rod 31, a swing rod 32, a gear 41, a rack 42 and an electromagnet 5. The fixed ring 1 is fixed to the motor through the connection of the fixing seat 6, and the fixed ring 1 and the rotor 72 of the motor are coaxial. A plurality of rotating cylinders 2 are distributed around the fixed ring 1, each rotating cylinder 2 is sleeved outside the fixed ring 1, and each rotating cylinder 2 is restricted to rotate only relative to the fixed ring 1 through the connection of the connecting shaft 21. The connecting rod 31 and the swing rod 32 are used to connect two adjacent rotating cylinders 2, so that when one of the rotating cylinders 2 rotates, each rotating cylinder 2 can be driven to rotate by each connecting rod 31 and the swing rod 32 in sequence, so that each rotating cylinder 2 outside the fixed ring 1 can rotate synchronously relative to the fixed ring 1, so that the brake pads 33 fixed by each swing rod 32 can swing to press against the rotor 72 of the motor at the same time, so as to brake the motor.

[0044] The connecting shaft 21 is fixed to the outside of the fixing ring 1, and its fixing method can be as follows: Figures 4 to 6 As shown, the fixing ring 1 is provided with a notch 11, and the connecting shaft 21 is provided with mounting holes 211 penetrating through both ends, and the perforation path of the mounting hole 211 is an arc adapted to the diameter of the fixing ring 1. When installing the connecting shaft 21, each connecting shaft 21 is sequentially placed into the notch 11, and then the mounting hole 211 is adapted to the outside of the fixing ring 1, and is slid along the fixing ring 1 to the designated position to be fixed. Preferably, the cross-section of the mounting hole 211 and the cross-section of the fixing ring 1 can both be rectangular to prevent the connecting shaft 21 from rotating relative to the fixing ring 1. Figure 7, the fixing seat 6 is fixed to the motor, and the fixing seat 6 has a plurality of bosses 61 arranged in a circumferential array on the side facing away from the motor, and the end face of each boss 61 is provided with a recessed placement groove 611. After each connecting shaft 21 is sleeved on the fixing ring 1, the fixing ring 1 is embedded in the placement groove 611 of each boss 61, so that each boss 61 is respectively located between two adjacent connecting shafts 21, and the side of the boss 61 blocks the end face of the connecting shaft 21; finally, the fixing ring 1 and the fixing seat 6 can be fixed by screwing screws into the end face of the fixing ring 1. In the above fixing method, the connecting shaft 21 is blocked by the bosses 61 on both sides and is fixed outside the fixing ring 1. In addition, the end faces of the fixing ring 1 at both ends of the notch 11 are screwed with the limit bolts 23, so that the limit bolts 23 block the end face of the connecting shaft 21 near the notch 11, so that the connecting shaft 21 on both sides of the notch 11 is blocked by the screw head of the limit bolt 23 at the end near the notch 11 to achieve fixation.

[0045] Continue to refer to the attached Figure 5 , both ends of the connecting shaft 21 are fixed with bearings 22. Figure 6 The rotating cylinder 2 is cut from the middle to form two identical left and right shells, and the two shells are connected and fixed by screws to form the rotating cylinder 2, and the two shells are fitted to the connecting shaft 21 from both sides of the connecting shaft 21 and then fixed, so that the two shells cover the connecting shaft 21 and the outer rings of the bearings 22 at both ends of the connecting shaft 21, and the rotating cylinder 2 is adapted to fit outside the bearings 22 at both ends of the connecting shaft 21, thereby forming a structure in which the rotating cylinder 2 is restricted to rotate only relative to the fixed ring 1.

[0046] As attached Figure 8 and 9 As shown, both ends of the same side of the rotating cylinder 2 are pivotally connected to a connecting rod 31. The connecting rod 31 is bent into an L shape, and one end of the connecting rod 31 is pivotally connected to the rotating cylinder 2. The pivoting in this embodiment can be achieved by inserting a pin or a rivet, so that the two pivoted parts can rotate relative to each other. Figure 2, the other end of the connecting rod 31 is fixed with a connecting pin 311, and the connecting pin 311 can be a bolt with an external thread at the end, and the connecting pin 311 is screwed to the connecting rod 31 to achieve fixation. The connecting pins 311 of the two connecting rods 31 close to each other of the two adjacent rotating cylinders 2 are connected to the same swing rod 32, and the connection method is that waist-shaped holes 321 are set at both ends of the swing rod 32, and the connecting pins 311 of the two connecting rods 31 are respectively adapted to pass through the waist-shaped holes 321 at both ends of the swing rod 32 and then fixed to the connecting rod 31, so that the swing rod 32 is restricted between the screw head of the connecting pin 311 and the connecting rod 31, thereby limiting the connecting pin 311 of the connecting rod 31 to only be able to move and rotate relative to the waist-shaped hole 321. That is, when the rotating cylinder 2 rotates and drives the connecting rod 31 to swing, the connecting rod 31 can simultaneously drive the rocker arm 32 to swing relative to the fixed ring 1, and drive the brake pad 33 fixed on the side of the rocker arm 32 facing away from the connecting rod 31 to swing relative to the rotor 72 of the motor, so that each brake pad 33 is pressed against the annular surface of the rotor 72 at the same time, forming a braking action to quickly lock the rotor 72, so that the rotor 72 stops rotating instantly.

[0047] Furthermore, the brake pad 33 is adapted to be screwed with a first bolt (not shown in the figure), and the stud of the first bolt passes through the swing rod 32 and the brake pad 33 and is screwed to the screw head of the first bolt and the swing rod 32 for fastening, thereby achieving installation and fixation of the brake pad 33. The brake pad 33 can be replaced by unscrewing the first bolt, which is conducive to improving the service life of the brake device of the present invention.

[0048] The rotating cylinder 2 at the notch 11 of the fixing ring 1 is fixed with a gear 41 at one end close to the notch 11, and the fixing method can be as shown in the attached Figure 2 and 5As shown, the end face of one end of the gear 41 protrudes to form a raised portion 411, and a screw is inserted into the end face of the other end of the gear 41, so that the screw and the rotating cylinder 2 are spirally connected and fastened, so that the raised portion 411 of the gear 41 is pressed against the end face of the rotating cylinder 2, and the gear 41 and the rotating cylinder 2 are fixedly connected. In this structure, the blocking of the raised portion 411 can form a gap between the end faces of the gear 41 and the rotating cylinder 2, thereby preventing the rotating cylinder 2 from affecting the meshing transmission of the gear 41 and the rack 42. The rack 42 is fixed on the moving seat 43. The setting method of the moving seat 43 can refer to 10 and 11. The moving seat 43 is provided with guide holes 431 passing through both ends. The guide rod 44 is fixed in the motor. The guide rod 44 passes through the guide hole 431, so that the moving seat 43 is limited to move only along the guide rod 44 relative to the gear 41, so that the moving seat 43 drives the rack 42 to move, and the rack 42 drives the gear 41 to rotate, and the rotation of the gear 41 drives the rotating cylinder 2 to rotate, and the transmission of each connecting rod 31 and each swing rod 32 makes each rotating cylinder 2 rotate synchronously and in the same direction. Further, in order to improve the transmission efficiency, the rotating cylinder 2 on both sides of the notch 11 of the fixed ring 1 can be fixed with the gear 41, and the two sides of the moving seat 43 can also be fixed with the rack 42. The two racks 42 are respectively meshed with the two gears 41, so that the moving seat 43 moves and drives the two gears 41 to move at the same time, thereby realizing the transmission mode in which the double gears 41 drive each rotating cylinder 2 to rotate at the same time, which is conducive to improving the transmission efficiency.

[0049] Continue to refer to the attached Fig.10 A spring 45 is also connected between the moving seat 43 and the inner wall of the motor. The spring 45 can be sleeved outside the guide rod 44, so that the two ends of the spring 45 are respectively against the inner wall of the motor and the moving seat 43, and the elastic force of the spring 45 is used to form a thrust to push the moving seat 43 and the rack 42 to move, forming a Figure 8 , 13 As shown in FIG. 14 , the gear 41 rotates to drive the rotating cylinder 2 to rotate, and drives the swing rod 32 to swing through the connecting rod 31 until the brake pad 33 presses against the rotor 72 of the motor, thereby achieving rapid braking. It can be seen that this braking process relies on the thrust formed by the spring 45 to push the swing rod 32 to swing relative to the center of the fixed ring 1 until the rotor 72 is pressed tightly, thereby achieving braking.

[0050] As attached Figure 1 and 15 As shown, the electromagnet 5 is fixed in the motor and is located at one end of the moving seat 43 facing the spring 45. The electromagnet 5 and the motor can be connected in parallel or in series, so that the electromagnet 5 is also powered when the motor is powered on, and the electromagnet 5 is also de-energized when the motor is powered off. The magnetic force generated by the electromagnet 5 when it is powered on attracts the moving seat 43 to move, so that the rack 42 fixed to the moving seat 43 moves along the guide rod 44. This process is shown in the attached figure. Fig. 9 , 16As shown in FIG. 17 , the rack 42 drives the gear 41 to rotate, so that the gear 41 rotates to drive the rotating cylinder 2 to rotate, and the connecting rod 31 drives the swing rod 32 to swing until the brake pad 33 leaves the rotor 72 of the motor, so that the rotor 72 can rotate, and in this process, the moving seat 43 compresses the spring 45. Preferably, a magnet 51 is fixed on the end surface of the moving seat 43 facing the electromagnet 5, and the magnetic force formed by the electromagnet 5 when it is energized can attract the magnet 51 to drive the moving seat 43 to move in the direction of the electromagnet 5.

[0051] During the above braking process, the diameter of each brake pad 33 changes greatly as the swing arm 32 swings relative to the rotor 72, so it is applicable to the braking of rotors 72 with different diameters. The specific diameter range of each brake pad 33 can be the diameter of the rotor 72 that can pass between each brake pad 33 after the electromagnet 5 is energized to swing away from the rotor 72 and swing in the opposite direction (i.e., as shown in the attached figure). Fig. 9 The diameter of each brake pad 33 after opening is slightly smaller than the diameter formed by the distance between the two corresponding brake pads 33 after each swing rod 32 swings to be parallel to the fixed ring 1 (i.e., as shown in the attached figure Figure 8 Thus, the braking device of the present invention can be applied to the braking of rotors 72 of various diameters by driving the brake pads 33 to swing relative to the rotor 72 through the swing rod 32, and thus has high versatility.

[0052] In addition, the present invention also discloses a motor equipped with the above-mentioned braking device, as shown in the attached Fig.13 and 16 As shown in FIG. 1 , the motor includes a rear end cover 71 and a rotor 72, wherein the rotor 72 penetrates the rear end cover 71. Figure 1 and 7 The fixed seat 6, guide rod 44 and electromagnet 5 of the brake device are all fixed in the rear end cover 71, so that the fixed ring 1 and the rack 42 are also arranged in the rear end cover 71, and one end of the spring 45 is against the end surface in the rear end cover 71.

[0053] As attached Figures 12 to 14As shown, the rotor 72 fixes the brake disc 73, and when the magnetic attraction rack 42 formed by the electromagnet 5 is energized and moves, the swing rod 32 swings and drives the brake pad 33 to press against the brake disc 73. Further, the brake disc 73 is covered with a circle of brake ring 74, and when the magnetic attraction rack 42 formed by the electromagnet 5 is energized and moves, the swing rod 32 swings and drives the brake pad 33 to press against the brake ring 74, so as to achieve instant braking of the rotor 72. Furthermore, a circle of raised blocking parts 731 is set at one end of the annular surface of the brake disc 73, and the brake ring 74 is sleeved outside the brake disc 73 and attached to the blocking part 731, and the brake ring 74 and the blocking part 731 are fixedly connected by wearing a second bolt (not marked in the figure). When the brake ring 74 is worn out after long-term use, the second bolt can be disassembled to remove the worn brake ring 74 and replace it with a new brake ring 74, so as to improve the service life of the motor.

[0054] In addition, as attached Fig.14 and 17 As shown, the side of the brake pad 33 facing the center of the fixing ring 1 is an inclined first slope, and the end of the outer periphery of the brake ring 74 is an inclined second slope. When the swing arm 32 swings to drive the brake pad 33 to swing downward, the first slope of the brake pad 33 can be pressed from the side of the brake ring 74 to the second slope of the brake ring 74. This method can increase the contact area between the brake pad 33 and the brake ring 74, which is beneficial to improving the braking effect.

[0055] As attached Fig.10 As shown, preferably, a connection seat 46 can also be fixed in the rear end cover 71 of the motor, and the fixing method can be realized by screwing, and the electromagnet 5 can also be fixed to the connection seat 46 by screwing. A support rod 461 is fixed on one end of the connection seat 46, and a fixing hole is set on the support rod 461. The end face of one end of the guide rod 44 is screwed with a screw. The screw penetrates from the end face outside the rear end cover 71 into the rear end cover 71 and then is screwed with the guide rod 44 to fix one end of the guide rod 44. The other end of the guide rod 44 passes through the fixing hole of the support rod 461 and then is screwed with a nut, so that the other end of the guide rod 44 is also fixed, and the guide rod 44 is suspended in the rear end cover 71.

[0056] In summary, the present invention utilizes the electromagnet 5 to be energized at the same time as the motor is energized to form a magnetic force, so as to attract the moving seat 43 and the rack 42 to move, thereby driving the gear 41 to rotate and driving the rotating cylinder 2 to rotate, and driving each connecting rod 31 and each swing rod 32 to swing through the rotation of the rotating cylinder 2, and the swing rod 32 swings until the brake pad 33 leaves the rotor 72 of the motor, so that the rotor 72 can rotate. When the motor is powered off, the electromagnet 5 loses the magnetic force of attracting the moving seat 43, so that the elastic force of the spring 45 stretching forms a thrust to push the moving seat 43 and the rack 42 to move, thereby driving the gear 41 to rotate and driving the rotating cylinder 2 to rotate, and driving each swing rod 32 to swing through each connecting rod 31, and the swing rod 32 swings until each brake pad 33 presses against the rotor 72 of the motor, so as to achieve rapid braking.

[0057] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A motor braking device, characterized in that: The braking device comprises: A fixing ring, wherein the fixing ring is fixed in the motor, and the fixing ring and the rotor of the motor are coaxial; A rotating cylinder, the rotating cylinder is sleeved outside the fixing ring, and a plurality of the rotating cylinders are distributed around the circumference of the fixing ring, and each of the rotating cylinders is restricted to rotate only relative to the fixing ring; A connecting rod, the connecting rod is bent into an L shape, one end of the connecting rod is pivotally connected to the rotating cylinder, the other end of the connecting rod is fixed with a connecting pin, and both ends of the same side of the rotating cylinder are pivotally connected to the connecting rod; A swing rod, the connecting pins of the two connecting rods close to each other of the two adjacent rotating cylinders are connected to the same swing rod, waist-shaped holes are arranged at both ends of the swing rod, the connecting pins of the two connecting rods are respectively adapted to pass through the waist-shaped holes at both ends of the swing rod, and the brake pad is fixed on the side of the swing rod facing away from the connecting rod; Gear and rack, wherein the gear is fixed on one side of the rotating cylinder, the rack is meshed with the gear, one end of the rack is connected to a spring, the elastic force of the spring stretching forms a thrust to push the rack to move, so that the gear rotates to drive the rotating cylinder to rotate, and the connecting rod drives the swing arm to swing until the brake pad presses against the rotor of the motor; The electromagnet, when energized, forms a magnetic force to attract the rack to move, compress the spring, and simultaneously rotate the gear to drive the rotating cylinder to rotate, and drive the swing arm to swing through the connecting rod until the brake pad leaves the rotor of the motor.

2. The braking device according to claim 1, characterized in that The braking device also includes a connecting shaft, each of the rotating cylinders is connected to a connecting shaft, the connecting shaft is fixed to the outside of the fixing ring, and bearings are fixed at both ends of the connecting shaft, and the rotating cylinder is adapted to be mounted outside the bearings at both ends of the connecting shaft.

3. The braking device according to claim 2, characterized in that: The fixing ring is provided with a notch, and the connecting shaft is provided with mounting holes penetrating through both ends. The perforation path of the mounting holes is an arc adapted to the diameter of the fixing ring. After the connecting shaft is placed in the notch, the mounting holes are adapted to fit outside the fixing ring.

4. The braking device according to claim 2 or 3, characterized in that: The rotating cylinder is cut from the middle to form two equal shells, the two shells are connected and fixed by screws to form the rotating cylinder, and the two shells cover the connecting shaft and the outer rings of the bearings at both ends of the connecting shaft.

5. The braking device according to claim 3, characterized in that: The braking device also includes a fixing seat, which is fixed in the motor, and a plurality of bosses are distributed in a circular array on a side of the fixing seat that is opposite to the side fixed to the motor, and a recessed placement groove is provided on the end face of each boss. The fixing ring is embedded in and fixed to the placement groove of each boss, so that each boss is respectively located between two adjacent connecting shafts, and the side of the boss blocks the end face of the connecting shaft.

6. The braking device according to claim 1, characterized in that: The rack is fixed to the moving seat, the moving seat is provided with guide holes passing through both ends, a guide rod is fixed inside the motor, the guide rod passes through the guide hole, and the spring is sleeved outside the guide rod so that the two ends of the spring are respectively against the inner wall of the motor and the moving seat.

7. The braking device according to claim 1, characterized in that: The brake pad is adapted to be screwed to a first bolt, and the stud of the first bolt passes through the swing arm and the brake pad to be screwed to be fastened.

8. A motor equipped with the braking device according to any one of claims 1 to 7, characterized in that: The motor comprises a rear end cover and a rotor, wherein the rotor penetrates into the rear end cover, and the fixing ring, the rack and the electromagnet are all arranged inside the rear end cover.

9. The motor as claimed in claim 8, characterized in that: The rotor fixes the brake disc. When the electromagnet loses power and loses the magnetic force for adsorbing the rack, the spring pushes the rack to move, driving the swing rod to swing and driving the brake pad to press against the brake disc.

10. The motor according to claim 9, characterized in that The rotor fixes the brake disc, a raised blocking portion is arranged at one end of the brake disc annular surface, a brake ring is arranged on the outer sleeve of the brake disc, the brake ring is attached to the blocking portion, and the brake ring and the blocking portion are fixedly connected, when the electromagnet loses power and loses the magnetic force for adsorbing the rack, the spring pushes the rack to move, drives the rocker arm to swing, and drives the brake pad to press against the brake disc.

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