High-power motor with overload protection device

Abstract

The invention discloses a high-power motor with an overload protection device, which is applied to the technical field of motors, and is characterized in that when a motor body is overloaded due to output blocking, the torque load between a propelling ratchet and an upper end angle exceeds the elastic force of a load elastic sheet, and the propelling ratchet presses the upper end angle, so that a crankshaft body is screwed into a movable groove; the pushing ratchet can pass through the upper portion of the movable groove to disconnect coupling transmission between the coupling concave disc and the coupling convex disc, so that overload torque is prevented from being fed back to the motor body, the overload protection effect on the motor is achieved, and compared with a traditional expansion sleeve friction coupling mode, the crankshaft body can be easily restored through the elastic force of a load elastic piece, and the service life of the crankshaft is prolonged. Multi-frequency overload protection is facilitated, and the valid period of the overload protection capability of the motor is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a high-power electric machine with an overload protection device. BACKGROUND

[0002] Motor overload refers to the actual use of power exceeding the rated power of the motor. Overload operation causes the internal temperature of the motor to rise, which may exceed the temperature rise limit. One type of motor overload is that the driving rotation of the motor is hindered, and the output shaft of the motor cannot rotate due to the hindrance, so that the internal energy of the motor cannot be released, resulting in damage or failure of the motor parts, and even the motor may be scrapped, thereby increasing the cost of repair or replacement. For this type of motor overload, the existing overload protection methods, such as the electric machine with overload protection function disclosed in Chinese patent CN223488039U and the speed reducer motor with overload protection disclosed in Chinese patent CN216599278U, use the expansion sleeve friction coupling method for overload protection. However, the expansion sleeve used for friction transmission will gradually increase in wear after starting the overload protection function several times, and its friction transmission capacity will gradually decrease, affecting the accuracy and effective period of its overload protection capacity. SUMMARY

[0003] The core of the present application is to solve the problem of inaccurate activation of the overload protection capacity of the expansion sleeve due to wear in the prior art by using the overturning movement of the crankshaft body.

[0004] To solve the above problems, the present application adopts the following technical solution.

[0005] A high-power electric machine with an overload protection device, comprising an electric motor body and an overload protection assembly fixedly connected to the output end of the electric motor body. The overload protection assembly comprises a component cylinder fixedly connected to the electric motor body, and a coupling concave disc and a coupling convex disc rotatably connected to the two ends of the inside of the component cylinder, respectively. The coupling concave disc and the coupling convex disc are in sleeve connection. The output shaft of the electric motor body is fixedly connected to the coupling concave disc. The middle part of the coupling convex disc is fixedly connected with an output worm.

[0006] The outer part of the coupling convex disc is provided with a movable groove. The movable groove is rotatably connected with a crankshaft body. The surface of the crankshaft body is fixedly connected with an upper corner and a lower corner at both ends, respectively. The inner wall of the coupling concave disc is fixedly connected with a propeller gear. The propeller gear is in sliding contact with the upper corner. The inner wall of the movable groove is fixedly connected with a load spring between one end and the lower surface of the lower corner.

[0007] Further, the crankshaft body is in cylindrical shape, and a shaft is fixedly connected between the shaft center of the crankshaft body and the outer ring surface. The shaft is rotatably connected with the front and rear ends of the movable groove.

[0008] Further, the load spring is in the shape of a U. The load spring is made of spring steel sheet.

[0009] Further, the inner wall of the movable groove is fixedly connected with a limiting rib at the other end, the limiting rib is triangularly arranged, and the upper end and the lower end are respectively in contact with the upper and lower inclined surfaces of the limiting rib.

[0010] Optionally, a telescopic groove is formed at the bottom of the other end of the inner wall of the movable groove, a load increasing pin body is movably connected in the telescopic groove, the top end of the load increasing pin body is in sliding contact with the tip of the lower end, and the bottom of the load increasing pin body is fixedly connected with a telescopic spring.

[0011] Further, the load increasing pin body is divided into an upper pin body and a lower pin body, a sliding groove is formed at the bottom of the upper pin body, a sliding rail is fixedly connected to the top of the lower pin body, and the sliding groove and the sliding rail are in sliding connection.

[0012] Further, the outer portion of the sliding rail is fixedly connected with a horizontal pushing spring, the horizontal pushing spring is V-shaped, and the tail end of the horizontal pushing spring is in sliding contact with the inner wall of the sliding groove.

[0013] Compared with the prior art, the advantages of the present application are that:

[0014] (1) When the motor body is overloaded due to output obstruction, the torque load between the pushing ratchet and the upper end exceeds the elastic force of the load spring, the pushing ratchet presses the upper end, the crankshaft body rotates into the movable groove, the pushing ratchet can pass above the movable groove, the connection transmission between the shaft coupling concave disc and the shaft coupling convex disc is disconnected, thereby preventing the overload torque from being fed back to the motor body, playing a role in overload protection of the motor, compared with the traditional expansion sleeve friction shaft coupling mode, the crankshaft body can easily restore by the elastic force of the load spring, facilitating multi-frequency overload protection, and improving the effective period of the motor overload protection capability.

[0015] (2) The telescopic spring pushes the load increasing pin body to rise, so that the load increasing pin body abuts against the lower end, the elastic force of the telescopic spring and the elastic force of the load spring are combined to enhance the ability of the crankshaft body to resist the pushing ratchet when it is turned upward, so as to improve the threshold of the crankshaft body to start the overload protection capability, effectively avoiding the disconnection of the connection transmission between the shaft coupling concave disc and the shaft coupling convex disc during low load, and avoiding affecting the normal use of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective view of the disassembled state of the present application;

[0017] Figure 2 is a perspective view of the shaft coupling concave disc of the present application;

[0018] Figure 3 is a perspective view of the shaft coupling convex disc of the present application;

[0019] Figure 4 is a cross-sectional perspective view of the combined state of the shaft coupling concave disc and the shaft coupling convex disc of the present application;

[0020] Figure 5 This is a three-dimensional structural diagram of the crankshaft body of the present invention;

[0021] Figure 6 This is a cross-sectional view of the crankshaft body of the present invention;

[0022] Figure 7 This is a demonstration diagram showing the contact state between the advancing ratchet and the upper corner of the present invention;

[0023] Figure 8 This is a demonstration diagram of the downward rotation of the crankshaft body according to the present invention;

[0024] Figure 9 This is a three-dimensional structural diagram of the loading pin of the present invention;

[0025] Figure 10 This is a three-dimensional structural diagram of the upper and lower pins of the present invention;

[0026] Figure 11 This is a demonstration diagram showing the lower corner of the present invention abutting against the outer edge of the top of the upper pin.

[0027] Figure 12 This is a demonstration diagram of the crankshaft body rotating upwards according to the present invention.

[0028] Explanation of the labels in the diagram:

[0029] 1. Motor body, 201. Component cylinder, 202. Coupling concave plate, 203. Coupling convex plate, 204. Output worm gear, 205. Movable groove, 206. Crankshaft body, 207. Upper end angle, 208. Lower end angle, 209. Propulsion ratchet, 210. Load spring, 211. Rotating shaft, 212. Limiting stop rib, 3. Load-increasing pin, 301. Telescopic groove, 302. Telescopic spring, 303. Upper pin, 304. Lower pin, 305. Slide groove, 306. Slide rail, 307. Horizontal push spring. Detailed Implementation

[0030] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0031] First implementation method:

[0032] Please see Figures 1 to 8The utility model provides a kind of high-power motor with overload protection device, including motor body 1 and the overload protection assembly of the external fixed connection of motor body 1 output end, overload protection assembly includes with motor body 1 fixed connection component cylinder 201 and respectively with component cylinder 201 inside two ends rotation connection coupling concave disc 202 and coupling convex disc 203, coupling concave disc 202 and coupling convex disc 203 sleeve joint, motor body 1's output shaft is fixedly connected with coupling concave disc 202, the middle part of coupling convex disc 203 is fixedly connected with output worm 204, the sleeve joint of coupling concave disc 202 and coupling convex disc 203 is connected with the transmission of motor body 1 output shaft and output worm 204, coupling convex disc 203 outside is provided with movable groove 205, movable groove 205 is rotatably connected with crank body 206 in the inside, crank body 206 is cylindrically arranged, and the fixed connection of crank body 206's axle and outer ring surface between face has shaft 211, shaft 211 is rotatably connected with movable groove 205's front and back end, the surface both ends of crank body 206 are fixedly connected with upper end angle 207 and lower end angle 208 respectively, the inner wall of coupling concave disc 202 is fixedly connected with propelling ratchet 209, propelling ratchet 209 is slidably contacted with upper end angle 207, propelling ratchet 209 is contacted with upper end angle 207, makes coupling concave disc 202 and coupling convex disc 203 carry out rotary transmission, the fixed connection of movable groove 205 inner wall one end and the lower surface between lower end angle 208 is provided with load spring 210, when the torque load between propelling ratchet 209 and upper end angle 207 exceeds the elasticity of load spring 210, crank body 206 is pressed into movable groove 205 by propelling ratchet 209, so that propelling ratchet 209 can pass through the upper of movable groove 205, disconnects the coupling transmission between coupling concave disc 202 and coupling convex disc 203, to prevent overload torque from being fed back to motor body 1, plays the role of overload protection to motor, load spring 210 is in the shape of Chinese character, and load spring 210 is made of spring steel sheet, the other end of movable groove 205 inner wall is fixedly connected with limiting stop rib 212, limiting stop rib 212 is in the shape of triangle, upper end angle 207 and lower end angle 208 respectively contact the upper and lower inclined surface of limiting stop rib 212, the rotation angle of upper end angle 207 and lower end angle 208 is limited by limiting stop rib 212, effectively prevent crank body 206 from excessive rotation;

[0033] When using motor, the output shaft of motor body 1 rotates and drives coupling concave disc 202, propelling ratchet 209 on the inner wall of coupling concave disc 202 is contacted with upper end angle 207, the rotary transmission between coupling concave disc 202 and coupling convex disc 203 is realized by propelling crank body 206, and then the rotary drive of equipment is realized by output worm 204;

[0034] When the rotation of output worm 204 is hindered, the output shaft of motor body 1 is still in the state of rotary output, for example Figure 8As shown, the torque load between the advancing ratchet 209 and the upper end angle 207 exceeds the elastic force of the load spring 210, the advancing ratchet 209 presses the upper end angle 207, the crankshaft body 206 is screwed into the movable groove 205, the advancing ratchet 209 can pass above the movable groove 205, the connection transmission between the shaft recess 202 and the shaft convex 203 is disconnected, thereby preventing the overload torque from being fed back to the motor body 1, playing a role in the overload protection of the motor. Compared with the traditional expansion sleeve friction shaft connection mode, the crankshaft body 206 can easily restore the elastic force of the load spring 210, facilitate the overload protection of multiple frequencies, and improve the effective period of the motor overload protection capability.

[0035] Second embodiment:

[0036] Compared with the first embodiment, the load increasing pin body 3 is mainly added, and the specific added structure is as follows, and the remaining structure is consistent with the first embodiment.

[0037] Please refer to Figures 8 to 12 The other end of the inner wall of the movable groove 205 is provided with an expansion slot 301, the expansion slot 301 is movably connected with the load increasing pin body 3, the top end of the load increasing pin body 3 is in sliding contact with the tip of the lower end angle 208, and the bottom of the load increasing pin body 3 is fixedly connected with the expansion spring 302. The expansion spring 302 pushes the load increasing pin body 3 upwards, so that the load increasing pin body 3 abuts against the lower end angle 208, thereby enhancing the compression resistance of the crankshaft body 206, improving the threshold value of the crankshaft body 206 starting overload protection capability, and effectively avoiding the disconnection of the connection transmission between the shaft recess 202 and the shaft convex 203 during low load. The load increasing pin body 3 is divided into an upper pin body 303 and a lower pin body 304, the bottom of the upper pin body 303 is provided with a sliding groove 305, the top of the lower pin body 304 is fixedly connected with a sliding rail 306, the sliding groove 305 and the sliding rail 306 are in sliding connection, the outer portion of the sliding rail 306 is fixedly connected with a horizontal pushing spring 307, the horizontal pushing spring 307 is arranged in a V shape, and the tail end of the horizontal pushing spring 307 is in sliding contact with the inner wall of the sliding groove 305. The horizontal pushing spring 307 pushes the upper pin body 303 to slide on the lower pin body 304, when the load increasing pin body 3 abuts against the lower end angle 208, the contact shadow area of the upper pin body 303 and the lower end angle 208 is increased, further improving the supporting effect of the load increasing pin body 3 on the lower end angle 208;

[0038] Compared to the first implementation method, when the motor is in normal use, the ratchet 209 contacts the upper corner 207, and the crankshaft 206 is pushed to realize the rotational transmission between the coupling concave plate 202 and the coupling convex plate 203. At this time, the telescopic spring 302 pushes the load-adding pin 3 to rise, so that the load-adding pin 3 abuts against the lower corner 208. The elastic force of the telescopic spring 302 combined with the elastic force of the load spring 210 enhances the ability of the crankshaft 206 to flip upward and resist the ratchet 209, thereby increasing the threshold of the crankshaft 206's overload protection capability. This effectively avoids disconnecting the connection transmission between the coupling concave plate 202 and the coupling convex plate 203 during low load periods, thus avoiding affecting the normal use of the motor.

[0039] When the rotation of the output worm gear 204 is obstructed, the crankshaft body 206 screws into the movable groove 205, disconnecting the transmission between the coupling concave plate 202 and the coupling convex plate 203. After the overload protection process is initiated, the lower end angle 208 on the crankshaft body 206 has already rotated downwards past the top of the load-adding pin 3. Then, when the load spring 210 pushes the lower end angle 208 to return the crankshaft body 206 to its original position, the load-adding pin 3 has already risen and returned to its original position under the elastic force of the telescopic spring 302. The load-adding pin 3 prevents the lower end angle 208 from rotating, keeping the crankshaft body 206 in a semi-downward rotating state. Figure 11 As shown, in this state, the pusher ratchet 209 can more easily press the upper end angle 207 to make the crankshaft body 206 rotate downwards, thereby maintaining the overload protection state of the motor and effectively preventing the motor's overload protection capability from being repeatedly started.

[0040] After eliminating the rotational obstruction of the output worm gear 204 and relieving the cause of the motor overload, the reverse rotation capability of the output shaft of the motor body 1 is activated, pushing the ratchet 209 to make reverse contact with the upper end angle 207, thereby driving the crankshaft body 206 to rotate upwards. Figure 12 As shown, this causes the lower end corner 208 to press down the load-adding pin 3, so that the lower end corner 208 passes over the top of the load-adding pin 3, and the top of the load-adding pin 3 returns to the state where the lower end corner 208 is supported by the top of the load-adding pin 3. Then, the forward rotation of the output shaft of the motor body 1 is restored, and the motor continues to be used.

[0041] The load-adding pin 3 is divided into an upper pin 303 and a lower pin 304. When the load-adding pin 3 abuts against the lower corner 208, the upper pin 303 is affected by the elastic force of the transverse push spring 307, causing the upper pin 303 to move closer to the lower corner 208, effectively increasing the contact shadow area between the upper pin 303 and the lower corner 208. Figure 11As shown, the support effect of the load increasing pin body 3 on the lower end corner 208 is further improved. When the load increasing pin body 3 prevents the lower end corner 208 from rotating upward, the lower end corner 208 abuts against the top end side surface of the upper pin body 303, the upper pin body 303 is further away from the lower end corner 208 in the transverse direction, and the influence of the load increasing pin body 3 on the upward rotation of the lower end corner 208 is effectively reduced. Compared with the downward rotation of the lower end corner 208 to press the load increasing pin body 3, the upward rotation of the lower end corner 208 is more likely to press the load increasing pin body 3 to descend.

[0042] The above description is only a preferred embodiment of the present application; all the protection scope of the present application, any person skilled in the art according to the technical solution and the improvement concept of the present application within the technical range disclosed by the present application, equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A high-power motor with overload protection device, comprising a motor body (1) and an overload protection assembly fixedly connected outside the output end of the motor body (1), characterized in that: The overload protection assembly comprises an assembly cylinder (201) fixedly connected with the motor body (1), a coupling concave disc (202) and a coupling convex disc (203) rotatably connected with the two ends of the interior of the assembly cylinder (201) respectively, the coupling concave disc (202) is sleeved with the coupling convex disc (203), the output rotating shaft of the motor body (1) is fixedly connected with the coupling concave disc (202), and the middle part of the coupling convex disc (203) is fixedly connected with an output worm (204); The outer part of the coupling convex disc (203) is provided with a movable groove (205), the movable groove (205) is rotatably connected with a crank body (206) inside, the surface of the crank body (206) is fixedly connected with an upper end angle (207) and a lower end angle (208) at the two ends respectively, the inner wall of the coupling concave disc (202) is fixedly connected with a propelling ratchet (209), the propelling ratchet (209) is in sliding contact with the upper end angle (207), and the inner wall of the movable groove (205) is fixedly connected with a load spring (210) between one end and the lower surface of the lower end angle (208).

2. A high-power motor with overload protection according to claim 1, characterized in that: The crank body (206) is cylindrically arranged, and the shaft center of the crank body (206) is fixedly connected with a rotating shaft (211) between the outer ring surface, and the rotating shaft (211) is rotatably connected with the front and rear ends of the movable groove (205).

3. A high-power motor with overload protection according to claim 1, characterized in that: The load spring (210) is in the shape of a few Chinese characters, and the load spring (210) is made of spring steel sheet.

4. A high-power motor with overload protection according to claim 1, characterized in that: The other end of the inner wall of the movable groove (205) is fixedly connected with a limiting stop rib (212), the limiting stop rib (212) is triangularly arranged, and the upper end angle (207) and the lower end angle (208) respectively contact the upper and lower inclined surfaces of the limiting stop rib (212).

5. A high-power motor with overload protection according to claim 1, characterized in that: The other end of the inner wall of the movable groove (205) is provided with an expansion slot (301) at the bottom, the expansion slot (301) is movably connected with a load increasing pin body (3) inside, the top end of the load increasing pin body (3) is in sliding contact with the tip of the lower end angle (208), and the bottom of the load increasing pin body (3) is fixedly connected with an expansion spring (302).

6. A high-power electric machine with overload protection according to claim 5, characterized in that: The load increasing pin body (3) is divided into an upper pin body (303) and a lower pin body (304), the bottom of the upper pin body (303) is provided with a sliding groove (305), the top of the lower pin body (304) is fixedly connected with a sliding rail (306), and the sliding groove (305) is in sliding connection with the sliding rail (306).

7. A high-power electric machine with overload protection according to claim 6, characterized in that: The outer part of the sliding rail (306) is fixedly connected with a horizontal pushing spring (307), the horizontal pushing spring (307) is in the shape of V, and the tail end of the horizontal pushing spring (307) is in sliding contact with the inner wall of the sliding groove (305).

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