Conveying equipment for bearing assembly

Abstract

The invention provides conveying equipment for bearing assembly, and relates to the technical field of transportation equipment.The conveying equipment comprises a primary conveying support, the primary conveying support comprises a conveying frame, a conveying sliding groove is formed in the conveying frame, two pairs of transmission cams are longitudinally and rotationally installed at the top of the conveying frame, and connecting rods are fixedly installed at the bottoms of the transmission cams; a clamping transmission frame is hinged to the bottom of each pair of transmission cams and slidably installed in a conveying sliding groove in the conveying frame, a clamping sliding frame is transversely installed on the clamping transmission frames in a left-right sliding mode, and a plurality of separation sliding blocks are transversely installed on the clamping sliding frame in a front-back sliding mode. The bearing inner and outer rings with different diameters can be clamped and transported through the clamping sliding frame and the separation sliding block, the distance between the inner and outer rings is evenly kept, detection and installation are convenient, the positions of the bearing inner and outer rings can be fixed in the transportation process through the annular supporting frame and the supporting ring set, and detection and installation are convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of transportation equipment, and particularly relates to a transportation device for bearing assembly. Background Art

[0002] In the current field of production and manufacturing of new energy vehicle vehicles, bearings, as key components, have a crucial impact on the performance of the vehicle in terms of the efficiency and quality of their assembly operations.

[0003] A bearing includes an outer bearing ring and an inner bearing ring. After the outer bearing ring and the inner bearing ring are processed and formed, they need to be assembled together. Before entering the assembly process, the outer bearing ring and the inner bearing ring need to be transported to the assembly station, and before assembly, the dimensions of the inner and outer bearing rings need to be detected, and appropriate-sized outer bearing rings and inner bearing rings are selected for paired assembly.

[0004] In some traditional cyclic conveying and assembly processes, although basic conveying and feeding can be achieved, it severely relies on manual picking and placing of materials, with a complex operation process, greatly increasing the labor intensity of workers, consuming a large amount of time and manpower, and having extremely low overall efficiency.

[0005] Based on this, the present invention provides a transportation device for bearing assembly. Summary of the Invention

[0006] In view of the above technical problems, the present invention provides a transportation device for bearing assembly, including a primary transmission support. The primary transmission support includes a transmission frame, on which a transmission chute is provided. At the top of the transmission frame, two pairs of driving cams are longitudinally rotatably installed. At the bottom of the driving cams, connecting rods are fixedly installed. At the bottom of each pair of driving cams, a clamping transmission frame is hinged. The clamping transmission frame is slidably installed in the transmission chute on the transmission frame. On the clamping transmission frame, a clamping sliding frame is slidably installed horizontally from left to right. On the clamping sliding frame, a plurality of partition sliders are slidably installed horizontally from front to back.

[0007] Furthermore, at the front end of the transmission frame, a positioning transmission belt is fixedly installed. The positioning transmission belt includes a positioning rotating frame, on which a pair of support shafts are horizontally rotatably installed. Between the two support shafts, a transmission belt is rotatably installed. Horizontally rotatably installed on the transmission belt are a plurality of annular support frames. A torsion spring is fixedly installed between the annular support frames and the transmission belt. Vertically slidably installed inside the annular support frames is a support ring group. Vertically rotatably installed at the top of the support ring group is an annular turntable. At the bottom of the support ring group, a top rod is fixedly installed. Vertically slidably installed inside the positioning rotating frame is an adjustment support, which is in contact and cooperation with the top rod at the bottom of the support ring group.

[0008] Further, the support ring group is composed of support rings with different diameters, and the support rings are longitudinally slidably engaged with each other. The adjusting bracket is composed of support frames with different specifications. An expansion rod is fixedly installed between each support frame and the positioning rotating frame. The support frames are respectively in contact and cooperation with the ejector rods at the bottoms of the support rings with different diameters in the support ring group.

[0009] Further, a positioning bracket is fixedly installed at the rear end of the positioning rotating frame. A sliding bracket is longitudinally slidably installed in the positioning bracket. A conical expansion frame is longitudinally rotatably installed at the bottom of the sliding bracket. A plurality of pressure detection plates are fixedly installed on the outer wall of the conical expansion frame. A second motor is fixedly installed at the top of the sliding bracket. The output shaft of the second motor is fixedly connected to the conical expansion frame.

[0010] Further, a pair of screws are fixedly installed at the top of the sliding bracket. A pair of adjusting belt pulleys are longitudinally rotatably installed at the top of the positioning bracket. The adjusting belt pulleys are in screw-threaded cooperation with the screws on the sliding bracket. The adjusting belt pulleys are connected by a belt. A third motor is fixedly installed on the positioning bracket. A belt pulley is fixedly installed on the third motor. The third motor and the adjusting belt pulleys are connected by a belt.

[0011] Further, a reset roller is horizontally rotatably installed at the bottom of the front end of the positioning rotating frame. The reset roller includes a driving roller, and the driving roller is horizontally rotatably installed at the bottom of the positioning rotating frame. The driving roller is in contact and cooperation with the conveyor belt. The diameter of the driving roller is the same as the distance between the two annular support frames. A magnetic reset plate is longitudinally slidably installed at the top of the driving roller. The magnetic reset plate is in contact and cooperation with the annular turntable. Rack bars are fixedly installed on both sides of the magnetic reset plate. Two adjusting gears are horizontally rotatably installed in the driving roller. A gravity slider is longitudinally slidably installed in the driving roller. Gear teeth are provided on both sides of the gravity slider. The gear teeth on both sides of the gravity slider are meshed with the adjusting gears. The rack bars on both sides of the magnetic reset plate are meshed with the adjusting gears.

[0012] Further, a fourth motor is fixedly installed on the positioning rotating frame. The output shaft of the fourth motor is connected to the support shaft. A plurality of dial blocks are longitudinally slidably installed on the conveyor belt. The dial blocks are slidably installed outside the annular support frame. A buffer groove is provided at the bottom of the positioning rotating frame. A magnetic track is fixedly installed in the buffer groove. The bottom of the dial block is slidably engaged with the buffer groove.

[0013] Further, a gear is fixedly installed at the top of the driving cam. Two pairs of transmission gears are longitudinally rotatably installed at the top of the transmission frame. The two transmission gears are meshed with each other. The transmission gears are meshed with the gear on the driving cam. Belt pulleys are fixedly installed on the transmission gears. The two pairs of transmission gears are connected by a belt. A first motor is fixedly installed on the transmission frame. The first motor is meshed with the transmission gears.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: (1) By means of the clamping sliding frame and the separating slider, the present invention can clamp and transport the inner and outer rings of bearings with different diameters, and evenly maintain the distance between them, which is convenient for detection and installation; (2) By means of the annular support frame and the support ring group, the present invention can fix the positions of the inner and outer rings of the bearings during transportation, which is convenient for detection and installation; (3) By means of the conical telescopic frame and the pressure detection plate, the present invention can correct the position of the bearing and quickly detect the defects of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front structural schematic diagram of the present invention.

[0016] Figure 2 It is a top structural schematic diagram of the present invention.

[0017] Figure 3 It is an overall structural schematic diagram of the present invention.

[0018] Figure 4 It is a half-sectional structural schematic diagram of the present invention.

[0019] Figure 5 It is a bottom half-sectional structural schematic diagram of the present invention.

[0020] Figure 6 It is a partial sectional structural schematic diagram of the transmission support of the present invention.

[0021] Figure 7 It is a half-sectional structural schematic diagram of the reset roller of the present invention.

[0022] Figure 8 It is an assembly structural schematic diagram of the annular support frame of the present invention.

[0023] Reference numerals: 1 - primary transmission support; 2 - positioning transmission belt; 3 - reset roller; 101 - transmission frame; 102 - transmission cam; 103 - transmission gear; 104 - first motor; 105 - clamping transmission frame; 106 - clamping sliding frame; 107 - separating slider; 201 - positioning rotating frame; 202 - transmission belt; 203 - annular support frame; 204 - annular turntable; 205 - dial block; 206 - support shaft; 207 - adjustment support; 208 - telescopic rod; 209 - positioning support; 210 - sliding support; 211 - adjustment pulley; 212 - second motor; 213 - third motor; 214 - conical telescopic frame; 215 - fourth motor; 216 - buffer tank; 217 - support ring group; 218 - pressure detection plate; 301 - transmission roller; 302 - magnetic reset plate; 303 - adjustment gear; 304 - gravity slider. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solution provided by the present invention will be further described below in conjunction with the accompanying drawings and according to specific embodiments.

[0025] As Figures 1 to 8 shown, a conveying device for bearing assembly includes a primary transmission bracket 1. The primary transmission bracket 1 includes a transmission frame 101. A transmission chute is provided on the transmission frame 101. Two pairs of transmission cams 102 are longitudinally rotatably installed on the top of the transmission frame 101. A gear is fixedly installed on the top of the transmission cam 102, and a connecting rod is fixedly installed at the bottom of the transmission cam 102. A clamping transmission frame 105 is jointly hinged at the bottom of each pair of transmission cams 102. The two connecting rods are hinged at the front and rear ends of the clamping transmission frame 105. A clamping sliding frame 106 is horizontally slidably installed in the left-right direction on the clamping transmission frame 105. A compression spring is fixedly installed between the clamping sliding frame 106 and the clamping transmission frame 105. A plurality of partition sliders 107 are horizontally slidably installed in the front-rear direction on the clamping sliding frame 106. Compression springs are fixedly installed between both sides of the partition slider 107 and the clamping sliding frame 106, which are used to clamp the inner ring or outer ring of the bearing parts, clamp the inner and outer rings of the bearing at the center of the conveyor belt, and keep a certain distance between them. At the same time, the slidable partition slider 107 is used to adapt to the inner and outer rings of bearings with different diameters, and slide to both sides when clamping the inner and outer rings of the bearing, so as to avoid over-extrusion and damage to the parts. Two pairs of transmission gears 103 are longitudinally rotatably installed on the top of the transmission frame 101. Two adjacent transmission gears 103 mesh with each other. The transmission gear 103 meshes with the gear on the transmission cam 102. A belt pulley is fixedly installed on the transmission gear 103. The two pairs of transmission gears 103 are connected by a belt. A first motor 104 is fixedly installed on the transmission frame 101. The first motor 104 meshes with the transmission gear 103. By starting the first motor 104, the transmission gear 103 is driven to rotate. The rotation of the transmission gear 103 drives the transmission cam 102 to rotate on the top of the transmission frame 101. The connecting rod at the bottom of the transmission cam 102 drives the clamping transmission frame 105 to perform a rotary motion in the transmission frame 101. The inner and outer rings of the bearing are adjusted and clamped and pushed forward by the synchronous relative motion of the two clamping transmission frames 105, and at the same time, the inner and outer rings of the bearing are kept at a distance and move forward synchronously, which is convenient for detection and transportation.

[0026] As Figures 1 to 8As shown in the figure, a positioning conveyor belt 2 is fixedly installed at the front end of the transmission rack 101. The positioning conveyor belt 2 includes a positioning rotating frame 201. A pair of support shafts 206 are horizontally rotatably installed on the positioning rotating frame 201. A fourth motor 215 is fixedly installed on the positioning rotating frame 201. The output shaft of the fourth motor 215 is connected to the support shaft 206. A conveyor belt 202 is rotatably installed between the two support shafts 206. A plurality of annular support frames 203 are horizontally rotatably installed on the conveyor belt 202. A torsion spring is fixedly installed between the annular support frame 203 and the conveyor belt 202. A support ring group 217 is longitudinally slidably installed in the annular support frame 203. The support ring group 217 is composed of support rings with different diameters and is used to form annular grooves with different diameters in the transmission gear 103 for fixing the inner and outer rings of the bearing to prevent position deviation during transportation from affecting subsequent assembly. The support rings slide longitudinally with each other. A rotary table 204 is longitudinally rotatably installed at the top of the support ring group 217. The rotary table 204 is used to carry the inner and outer rings of the bearing and enable them to rotate on the annular support frame 203, facilitating detection and assembly. A push rod is fixedly installed at the bottom of each support ring in the support ring group 217. An adjustment bracket 207 is longitudinally slidably installed in the positioning rotating frame 201. The adjustment bracket 207 is composed of support frames with different specifications. The adjustment bracket 207 is in contact and cooperation with the push rods at the bottom of the support ring group 217. An expansion rod 208 is fixedly installed between each support frame and the positioning rotating frame 201. The support frames are respectively in contact and cooperation with the push rods at the bottoms of the support rings with different diameters in the support ring group 217. By starting the expansion rod 208 at the bottom of the corresponding support frame to adjust the support frame to descend, the support ring with the corresponding diameter descends in the annular support frame 203, forming an annular positioning groove in the annular support frame 203 to position and transport the inner and outer rings of the bearing.

[0027] As Figures 1 to 8As shown, a positioning bracket 209 is fixedly installed at the rear end of the positioning rotating frame 201, and a sliding bracket 210 is longitudinally slidably installed in the positioning bracket 209. A conical telescopic bracket 214 is longitudinally rotatably installed at the bottom of the sliding bracket 210, and a plurality of pressure detection plates 218 are fixedly installed on the outer wall of the conical telescopic bracket 214. The conical telescopic bracket 214 is used to contact the inner walls of the inner and outer rings of the bearing to correct the inner and outer rings of the bearing to the center of the top of the annular turntable 204. The pressure detection plate 218 is used to detect whether there are defects on the inner and outer rings of the bearing. A second motor 212 is fixedly installed on the top of the sliding bracket 210, and the output shaft of the second motor 212 is fixedly connected to the conical telescopic bracket 214. A pair of screws are fixedly installed on the top of the sliding bracket 210, and a pair of adjusting pulleys 211 are longitudinally rotatably installed on the top of the positioning bracket 209. The adjusting pulleys 211 cooperate with the screw and lead screw on the sliding bracket 210, and the adjusting pulleys 211 are connected by belts. A third motor 213 is fixedly mounted on the frame 209, and a pulley is fixedly mounted on the third motor 213. The third motor 213 is connected to the adjusting pulley 211 through a belt. By starting the third motor 213, the adjusting pulley 211 is driven to rotate. The rotation of the adjusting pulley 211 drives the sliding bracket 210 to slide downward in the positioning bracket 209, so that the bottom of the conical telescopic bracket 214 extends into the inner wall of the bearing ring, so that the outer wall of the conical telescopic bracket 214 contacts the inner wall of the bearing ring, and the precise position of the inner and outer rings of the bearing on the annular turntable 204 is adjusted by the conical telescopic bracket 214. Then, the second motor 212 is started to drive the conical telescopic bracket 214 to rotate. When there are defects on the bearing ring resulting in uneven quality, shaking will occur when the inner and outer rings of the bearing rotate. The pressure detection plate 218 is used to detect the pressure changes generated when the inner and outer rings of the peripheral bearing shake, so as to detect whether the inner and outer rings of the bearing have defects, which is convenient for detecting the outer walls of the inner and outer rings of the bearing.

[0028] like Figures 1 to 8As shown, a reset roller 3 is installed at the bottom of the front end of the positioning rotating frame 201 for horizontal rotation. The reset roller 3 includes a transmission roller 301, which is installed at the bottom of the positioning rotating frame 201 for horizontal rotation. The transmission roller 301 is in contact with the transmission belt 202. The diameter of the transmission roller 301 is the same as the spacing between the two annular support frames 203. A magnetic reset plate 302 is installed on the top of the transmission roller 301 for longitudinal sliding. The magnetic reset plate 302 is in contact with the annular turntable 204. The support ring group 217 is reset by the magnetic adsorption of the magnetic reset plate 302 to prevent foreign matter remaining on the bearing ring from falling into the gap between the support rings on the support ring group 217, causing the support ring group 217 to be unable to move normally. At the same time, foreign matter on the annular turntable 204 is adsorbed. Racks are fixedly installed on both sides of the magnetic reset plate 302. Two adjusting gears 303 are installed for horizontal rotation in the transmission roller 301. A weight is installed in the transmission roller 301 for longitudinal sliding. The gravity slider 304 and the gravity slider 304 are provided with gear patterns on both sides. The gear patterns on both sides of the gravity slider 304 mesh with the adjusting gear 303, and the racks on both sides of the magnetic reset plate 302 mesh with the adjusting gear 303. When the fourth motor 215 drives the conveyor belt 202 to roll, the conveyor belt 202 drives the transmission roller 301 to rotate on the positioning rotating frame 201. Whenever the magnetic reset plate 302 rotates to the top, the gravity slider 304 slides downward in the transmission roller 301 by gravity, and drives the adjusting gear 303 to rotate by the gear patterns on the gravity slider 304. The rotation of the adjusting gear 303 drives the magnetic reset plate 302 to rise, so that the magnetic reset plate 302 fits the annular turntable 204 to reset it. At the same time, the gravity slider 304 flexibly controls the magnetic reset plate 302, so that the magnetic reset plate 302 can fit closely with the annular turntable 204 while preventing the annular turntable 204 from being damaged due to excessive pressure.

[0029] like Figures 1 to 8 As shown, a plurality of shifting blocks 205 are longitudinally slidably installed on the conveyor belt 202, and the shifting blocks 205 are slidably installed on the outer side of the annular support frame 203, and are used for shifting the inner and outer rings of the bearing out of the transmission slide groove of the conveyor frame 101 through the shifting blocks 205 when the conveyor belt 202 rolls, so that the inner and outer rings of the bearing can fall on the top of the annular turntable 204, and a buffer groove 216 is provided at the bottom of the positioning rotating frame 201, and a magnetic track is fixedly installed in the buffer groove 216, and the bottom of the shifting block 205 is slidably matched with the buffer groove 216, and is used for controlling the shifting block 205 to retract into the positioning rotating frame 201 when the shifting block 205 rotates to the bottom of the positioning rotating frame 201, and extend out at the front end of the conveyor frame 101, to prevent the shifting block 205 from getting stuck at the transmission roller 301 and affecting the rolling of the conveyor belt 202.

[0030] Working principle: When assembling the bearing, place the inner ring or outer ring of the bearing on the transmission chute inside the transmission rack 101. Then start the first motor 104 to drive the transmission cam 102 to rotate. The transmission cam 102 drives the clamping transmission rack 105 to perform a rotary motion inside the transmission rack 101 to clamp the inner and outer rings of the bearing, clamp the inner and outer rings of the bearing at the center of the transmission chute, and at the same time keep a certain distance between the inner ring or outer ring of the bearing.

[0031] When the inner and outer rings of the bearing move to the front end of the transmission rack 101, start the fourth motor 215 to drive the support shaft 206 to rotate, drive the transmission belt 202 to roll on the positioning rotating frame 201, and use the dial block 205 to dial the inner and outer rings of the bearing to the top of the annular turntable 204. Then start the third motor 213 to drive the sliding bracket 210 to descend, correct the positions of the inner and outer rings of the bearing through the conical telescopic frame 214, and start the second motor 212 to drive the inner and outer rings of the bearing to rotate on the annular support frame 203 to facilitate the detection of defects in the inner and outer rings of the bearing. At the same time, start the telescopic rod 208 at the corresponding position according to the diameter of the inner and outer rings of the bearing to drive the adjustment bracket 207 to descend, fix the inner and outer rings of the bearing, and perform transmission through the transmission belt 202.

[0032] After the transmission is completed, the annular support frame 203 is reset through the magnetic reset plate 302, and at the same time, foreign matters remaining in the support ring group 217 are adsorbed.

Claims

1. A conveying device for bearing assembly, comprising a primary transmission bracket (1), and the primary transmission bracket (1) includes a transmission frame (101), characterized in that, A transmission slide groove is provided on the transmission frame (101), two pairs of transmission cams (102) are longitudinally rotatably mounted on the top of the transmission frame (101), a connecting rod is fixedly mounted on the bottom of the transmission cams (102), a clamping transmission frame (105) is hingedly connected to the bottom of each pair of transmission cams (102), the clamping transmission frame (105) is slidably mounted in the transmission slide groove on the transmission frame (101), a clamping sliding frame (106) is slidably mounted on the clamping transmission frame (105) in a left-right transverse sliding manner, and a plurality of partitioning slide blocks (107) are slidably mounted on the clamping sliding frame (106) in a front-back transverse sliding manner; A positioning conveyor belt (2) is fixedly mounted at the front end of the conveyor frame (101), the positioning conveyor belt (2) comprising a positioning rotating frame (201), a pair of support shafts (206) are rotatably mounted on the positioning rotating frame (201), a conveyor belt (202) is rotatably mounted between the two support shafts (206), a plurality of annular support frames (203) are rotatably mounted on the conveyor belt (202), a torsion spring is fixedly mounted between the annular support frames (203) and the conveyor belt (202), a support ring group (217) is longitudinally slidably mounted in the annular support frame (203), an annular turntable (204) is longitudinally rotatably mounted on the top of the support ring group (217), a top rod is fixedly mounted at the bottom of the support ring group (217), an adjustment bracket (207) is longitudinally slidably mounted in the positioning rotating frame (201), and the adjustment bracket (207) is in contact with and cooperates with the top rod at the bottom of the support ring group (217).

2. The conveying device for bearing assembly according to claim 1, characterized in that, The support ring group (217) is composed of support rings of different diameters, and the support rings are longitudinally slidably matched with each other. The adjustment bracket (207) is composed of support frames of different specifications. A telescopic rod (208) is fixedly installed between each support frame and the positioning rotating frame (201), and the support frames are respectively in contact with the top rods at the bottom of the support rings of different diameters in the support ring group (217).

3. The conveying device for bearing assembly according to claim 1, characterized in that, A positioning bracket (209) is fixedly mounted on the rear end of the positioning rotating frame (201); a sliding bracket (210) is longitudinally slidably mounted inside the positioning bracket (209); a conical telescopic bracket (214) is longitudinally rotatably mounted on the bottom of the sliding bracket (210); a plurality of pressure detection plates (218) are fixedly mounted on the outer wall of the conical telescopic bracket (214); a second motor (212) is fixedly mounted on the top of the sliding bracket (210); and an output shaft of the second motor (212) is fixedly connected to the conical telescopic bracket (214).

4. A conveying device for bearing assembly according to claim 1, characterized in that, A pair of screws are fixedly mounted on the top of the sliding bracket (210), a pair of adjusting pulleys (211) are longitudinally rotatably mounted on the top of the positioning bracket (209), the adjusting pulleys (211) cooperate with the screws and lead screws on the sliding bracket (210), the adjusting pulleys (211) are connected via belts, a third motor (213) is fixedly mounted on the positioning bracket (209), a pulley is fixedly mounted on the third motor (213), and the third motor (213) and the adjusting pulley (211) are connected via belts.

5. A conveying device for bearing assembly according to claim 1, characterized in that, A reset roller (3) is horizontally rotatably installed at the bottom of the front end of the positioning rotating frame (201). The reset roller (3) includes a driving roller (301). The driving roller (301) is horizontally rotatably installed at the bottom of the positioning rotating frame (201). The driving roller (301) is in contact and cooperation with the transmission belt (202). The diameter of the driving roller (301) is the same as the distance between the two annular support frames (203). A magnetic reset plate (302) is longitudinally slidably installed on the top of the driving roller (301). The magnetic reset plate (302) is in contact and cooperation with the annular turntable (204). Rack bars are fixedly installed on both sides of the magnetic reset plate (302). Two adjusting gears (303) are horizontally rotatably installed inside the driving roller (301). A gravity slider (304) is longitudinally slidably installed inside the driving roller (301). Gear teeth are provided on both sides of the gravity slider (304). The gear teeth on both sides of the gravity slider (304) are meshed with the adjusting gears (303). The rack bars on both sides of the magnetic reset plate (302) are meshed with the adjusting gears (303).

6. The conveying device for bearing assembly according to claim 1, characterized in that, A fourth motor (215) is fixedly installed on the positioning rotating frame (201). The output shaft of the fourth motor (215) is connected to the support shaft (206). A plurality of dial blocks (205) are longitudinally slidably installed on the transmission belt (202). The dial blocks (205) are slidably installed outside the annular support frame (203). A buffer groove (216) is provided at the bottom of the positioning rotating frame (201). A magnetic track is fixedly installed inside the buffer groove (216). The bottom of the dial block (205) is slidably mated with the buffer groove (216).

7. A conveying device for bearing assembly according to claim 1, characterized in that, A gear is fixedly installed on the top of the transmission cam (102). Two pairs of transmission gears (103) are longitudinally rotatably installed on the top of the transmission frame (101). The two transmission gears (103) are meshed with each other. The transmission gears (103) are meshed with the gear on the transmission cam (102). A belt pulley is fixedly installed on the transmission gear (103). The two pairs of transmission gears (103) are connected by a belt. A first motor (104) is fixedly installed on the transmission frame (101). The first motor (104) is meshed with the transmission gear (103).

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