Device for sampling number of rotation turns of motor

Abstract

The invention relates to a device for sampling the number of rotation turns of a motor, and relates to the technical field of agricultural harvesters, the device comprises a sampling motor body, the top of the sampling motor body is fixedly connected with a motor top shell, and the motor top shell is internally provided with a speed reduction mechanism and a heat dissipation mechanism; the speed reduction mechanism comprises a speed reduction gearbox arranged in the motor top shell, and the lower surface of the speed reduction gearbox is fixedly connected with the top end of the sampling motor body. According to the invention, through the speed reduction structure design of multi-stage gear meshing, after the output shaft of the sampling motor body drives the driving gear to rotate, through step-by-step meshing transmission of the first-stage to fifth-stage transmission gears and the speed reduction gear, and in cooperation with meshing cooperation of the driven gear and the fifth-stage transmission gear, an ultrahigh-precision speed reduction effect is realized; the high-speed rotation of the motor is converted into the rotation of the magnet ring within 360 degrees, so that the high-speed rotation can be accurately converted into detectable angle change, the accurate sampling of the number of rotation turns of the motor and the accurate memory of the stay angle of the gun barrel are realized, and the operation efficiency of an agricultural machinist is improved.

Description

Technical Field

[0001] This invention relates to the field of agricultural harvester technology, specifically to a device for sampling the number of rotations of a motor. Background Technology

[0002] During the operation of agricultural harvesters, the unloading cannon, as the core unloading component, needs to be rotated to a specific angle according to the operation requirements to complete the unloading operation. After the unloading is completed and the machine returns to its original position, the angle information of the last unloading must be accurately recorded so that it can be quickly reset in the next operation, avoiding repeated adjustments and improving operation efficiency.

[0003] However, the unloading motors of existing agricultural harvesters generally operate at high speeds, typically reaching 2000 r / min. On the one hand, the movement trajectory of mechanical transmission components under high-speed rotation is difficult to capture, and traditional detection methods cannot accurately identify changes in the number of revolutions, affecting the continuity and convenience of agricultural machinery operations. This forces operators to readjust the angle of the unloading cannon before each unloading, which not only increases the number of operating steps and extends the operation time, but may also affect the unloading effect due to angle adjustment deviations, thus reducing overall operational efficiency.

[0004] To address this, we designed a device for sampling the number of rotations of a motor. Summary of the Invention

[0005] The purpose of this invention is to provide a device for sampling the number of rotations of a motor, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for sampling the number of rotations of a motor, comprising a sampling motor body, wherein a motor top shell is fixedly connected to the top of the sampling motor body, and a speed reduction mechanism and a heat dissipation mechanism are provided inside the motor top shell;

[0007] The reduction mechanism includes a reduction gearbox disposed inside the top housing of the motor. The lower surface of the reduction gearbox is fixedly connected to the top of the sampling motor body. The output shaft of the sampling motor body extends into the interior of the reduction gearbox and is fixedly connected to a drive gear. A first transmission shaft is rotatably connected to the inner bottom wall of the reduction gearbox. A first-stage transmission gear and a first-stage reduction gear are fixedly connected to the surface of the first transmission shaft. A second-stage transmission shaft, a third-stage transmission shaft, a fourth-stage transmission shaft, a fifth-stage transmission shaft, and a driven shaft are rotatably connected to the inner top wall of the reduction gearbox. A second-stage transmission gear, a third-stage transmission gear, a fourth-stage transmission gear, and a fifth-stage transmission gear are fixedly connected to the surfaces of the second-stage transmission shaft, the third-stage transmission shaft, the fourth-stage transmission shaft, and the fifth-stage transmission shaft, respectively.

[0008] Preferably, the lower surfaces of the second-stage, third-stage, fourth-stage, and fifth-stage transmission gears are all fixedly connected to a second-stage reduction gear, a third-stage reduction gear, a fourth-stage reduction gear, and a fifth-stage reduction gear, respectively. The first-stage reduction gear and the first-stage transmission gear are coaxial, the second-stage reduction gear and the second-stage transmission gear are coaxial, the third-stage reduction gear and the third-stage transmission gear are coaxial, the fourth-stage reduction gear and the fourth-stage transmission gear are coaxial, and the fifth-stage reduction gear and the fifth-stage transmission gear are coaxial.

[0009] Preferably, the diameter of the first-stage reduction gear is three times that of the drive gear, and the first-stage reduction gear meshes with the drive gear; the diameter of the second-stage reduction gear is four times that of the first-stage transmission gear, and the second-stage reduction gear meshes with the first-stage transmission gear.

[0010] Preferably, the diameter of the third-stage reduction gear is four times that of the second-stage transmission gear, and the third-stage reduction gear meshes with the second-stage transmission gear; the diameter of the fourth-stage reduction gear is four times that of the third-stage transmission gear, and the fourth-stage reduction gear meshes with the third-stage transmission gear.

[0011] Preferably, the diameter of the fifth-stage reduction gear is four times that of the fourth-stage transmission gear, and the fifth-stage reduction gear meshes with the fourth-stage transmission gear. A driven gear is fixedly connected to the surface of the driven shaft. The diameter of the driven gear is twice that of the fifth-stage transmission gear, and the driven gear meshes with the fifth-stage transmission gear.

[0012] Preferably, a magnet ring is fixedly connected to the top end of the driven shaft, and a Hall sensor is fixedly embedded in the inner top wall of the gearbox. The Hall sensor is located directly above the driven shaft, and the position of the Hall sensor is opposite to the magnet ring.

[0013] Preferably, the heat dissipation mechanism includes a negative pressure fan duct fixedly connected inside the motor top housing. A shaft hole is opened at the center of the upper surface of the negative pressure fan duct. A linkage shaft is rotatably connected to the inner wall of the shaft hole. A first synchronous pulley is fixedly connected to the top of the linkage shaft. The top of the secondary transmission shaft extends to the outside of the reduction gearbox and is fixedly connected to a second synchronous pulley. The height of the first synchronous pulley corresponds to that of the second synchronous pulley. A transmission belt is installed between the first synchronous pulley and the second synchronous pulley. The first synchronous pulley is connected to the second synchronous pulley through the transmission belt.

[0014] Preferably, a rotating impeller is fixedly connected to the surface of the linkage shaft. The rotating impeller is located inside the negative pressure air duct, and the air inlet end of the rotating impeller faces the bottom of the negative pressure air duct. An air inlet pipe is fixedly embedded on the side of the negative pressure air duct. The air inlet of the air inlet pipe is located below the rotating impeller, and the air inlet end of the air inlet pipe extends to the outside of the motor top housing.

[0015] Preferably, an exhaust pipe is fixedly embedded on the upper surface of the negative pressure duct, and the end of the exhaust pipe away from the negative pressure duct extends to the inner top wall of the motor top housing. An annular ventilation pipe is fixedly connected to the inner top wall of the motor top housing. A plurality of ventilation holes are opened on the lower surface of the annular ventilation pipe, and the plurality of ventilation holes are evenly distributed in a ring array on the surface of the annular ventilation pipe. The output end of the exhaust pipe is fixedly connected to the input end of the annular ventilation pipe.

[0016] Preferably, a plurality of metal heat-conducting strips are fixedly connected to the upper surface of the motor top shell, and the plurality of metal heat-conducting strips are evenly arranged in a linear array on the surface of the motor top shell. A dustproof mesh cover is fixedly connected to the air inlet of the air inlet pipe. A control main board is fixedly connected inside the motor top shell. The annular ventilation pipe is located directly above the gearbox and the control main board.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] (1) This device for sampling the number of rotations of the motor is designed with a multi-stage gear meshing reduction structure. After the output shaft of the sampling motor body drives the drive gear to rotate, it is driven by the step-by-step meshing of the first to fifth stage transmission gears and the reduction gear. With the meshing of the driven gear and the fifth stage transmission gear, an ultra-high precision reduction effect is achieved. The high-speed rotation of the motor at 2000r / min is converted into the rotation of the magnetic ring within 360°. Not only is the transmission stable, but it can also accurately convert the high-speed rotation into a detectable angle change. Furthermore, through the corresponding cooperation of the Hall sensor and the magnetic ring, the angle signal is converted into an electrical signal and transmitted to the control board, realizing accurate sampling of the number of rotations of the motor and accurate memory of the barrel's dwell angle, thus improving the efficiency of the agricultural machinery operator.

[0019] (2) The device for sampling motor rotation has a linkage cooling design, which can achieve efficient cooling without an additional power source. The secondary transmission shaft drives the linkage shaft to rotate, which in turn drives the rotating impeller in the negative pressure air duct to form a negative pressure to adsorb the outside cold air. After being introduced through the air inlet pipe, it is transported to the annular ventilation pipe through the exhaust pipe, and then blown evenly to the gearbox and control main board through the ventilation holes of the annular array, realizing directional air cooling of key components. The cooling structure works in linkage with the reduction mechanism, which not only saves additional power consumption, but also dissipates the heat generated by the high-speed operation of the generator and gear transmission in a timely manner, effectively preventing components from aging or degrading due to high temperature, extending the service life of the device, and ensuring the stability and reliability of the device in long-term operation scenarios. Attached Figure Description

[0020] Figure 1 This is a front view structural diagram of the present invention;

[0021] Figure 2 for Figure 1Enlarged structural diagram at point A;

[0022] Figure 3 This is a schematic diagram of the internal structure of the motor top shell of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the gearbox of the present invention;

[0024] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0025] Figure 6 This is a top view of the heat dissipation mechanism of the present invention;

[0026] Figure 7 This is an enlarged cross-sectional view of the negative pressure ventilation duct of the present invention;

[0027] Figure 8 This is a schematic diagram of the bottom view structure of the annular ventilation duct of the present invention.

[0028] In the diagram: 1. Sampling motor body; 2. Motor top housing; 3. Reduction mechanism; 4. Heat dissipation mechanism;

[0029] 301. Gearbox; 302. Drive gear; 303. First drive shaft; 304. First-stage drive gear; 305. First-stage reduction gear; 306. Second-stage drive shaft; 307. Third-stage drive shaft; 308. Fourth-stage drive shaft; 309. Fifth-stage drive shaft; 310. Driven shaft; 311. Second-stage drive gear; 312. Third-stage drive gear; 313. Fourth-stage drive gear; 314. Fifth-stage drive gear; 315. Second-stage reduction gear; 316. Third-stage reduction gear; 317. Fourth-stage reduction gear; 318. Fifth-stage reduction gear; 319. Driven gear; 320. Magnetic ring; 321. Hall sensor;

[0030] 401. Negative pressure duct; 402. Linkage shaft; 403. First synchronous pulley; 404. Second synchronous pulley; 405. Drive belt; 406. Metal heat-conducting strip; 407. Rotating impeller; 408. Air inlet pipe; 409. Exhaust pipe; 410. Annular ventilation pipe; 411. Ventilation vent; 412. Dustproof mesh cover. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-8 The present invention provides a technical solution: a device for sampling the number of rotations of a motor, comprising a sampling motor body 1, a motor top shell 2 fixedly connected to the top of the sampling motor body 1, and a speed reduction mechanism 3 and a heat dissipation mechanism 4 disposed inside the motor top shell 2.

[0033] Please see Figures 1 to 4 The reduction mechanism 3 includes a reduction gearbox 301 disposed inside the motor top housing 2. The lower surface of the reduction gearbox 301 is fixedly connected to the top of the sampling motor body 1. The output shaft of the sampling motor body 1 extends into the interior of the reduction gearbox 301 and is fixedly connected to a drive gear 302. The inner bottom wall of the reduction gearbox 301 is rotatably connected to a first transmission shaft 303. The surface of the first transmission shaft 303 is fixedly connected to a first-stage transmission gear 304 and a first-stage reduction gear 305. The inner top wall of the reduction gearbox 301 is rotatably connected to a second-stage transmission shaft 306, a third-stage transmission shaft 307, a fourth-stage transmission shaft 308, a fifth-stage transmission shaft 309, and a driven shaft 310. The surfaces of the second-stage transmission shaft 306, the third-stage transmission shaft 307, the fourth-stage transmission shaft 308, and the fifth-stage transmission shaft 309 are respectively fixedly connected to a second-stage transmission gear 311, a third-stage transmission gear 312, a fourth-stage transmission gear 313, and a fifth-stage transmission gear 314.

[0034] Please see Figures 2 to 6 The heat dissipation mechanism 4 includes a negative pressure fan duct 401 fixedly connected inside the motor top housing 2. A shaft hole is opened at the center of the upper surface of the negative pressure fan duct 401. A linkage shaft 402 is rotatably connected to the inner wall of the shaft hole. A first synchronous pulley 403 is fixedly connected to the top of the linkage shaft 402. The top of the secondary transmission shaft 306 extends to the outside of the reduction gearbox 301 and is fixedly connected to a second synchronous pulley 404. The height of the first synchronous pulley 403 corresponds to that of the second synchronous pulley 404. A transmission belt 405 is installed between the first synchronous pulley 403 and the second synchronous pulley 404. The first synchronous pulley 403 is connected to the second synchronous pulley 404 through the transmission belt 405.

[0035] A rotating impeller 407 is fixedly connected to the surface of the linkage shaft 402. The rotating impeller 407 is located inside the negative pressure duct 401, and the air inlet end of the rotating impeller 407 faces the bottom of the negative pressure duct 401. An air inlet pipe 408 is fixedly embedded on the side of the negative pressure duct 401. The air inlet of the air inlet pipe 408 is located below the rotating impeller 407, and the air inlet end of the air inlet pipe 408 extends to the outside of the motor top housing 2.

[0036] Please see Figures 6 to 8An exhaust pipe 409 is fixedly embedded on the upper surface of the negative pressure duct 401. The end of the exhaust pipe 409 away from the negative pressure duct 401 extends to the inner top wall of the motor top housing 2. An annular ventilation pipe 410 is fixedly connected to the inner top wall of the motor top housing 2. Several ventilation holes 411 are opened on the lower surface of the annular ventilation pipe 410. The several ventilation holes 411 are evenly distributed in a ring array on the surface of the annular ventilation pipe 410. The output end of the exhaust pipe 409 is fixedly connected to the input end of the annular ventilation pipe 410.

[0037] It should be noted that both the gearbox 301 and the motor top housing 2 have corresponding heat dissipation holes on their surfaces, which can be used to exhaust the heat inside the motor top housing 2 to the outside of the device.

[0038] It is worth noting that the heat dissipation mechanism 4 directly utilizes the transmission power of the reduction mechanism 3 to drive the heat dissipation components, which not only saves energy consumption but also simplifies the overall structure of the device, avoiding problems such as increased size and more potential failure points caused by an additional drive motor. The directional air cooling design is highly targeted, and the layout of the annular ventilation pipe 410 and ventilation holes 411 ensures that cold air accurately covers the two main heat-generating components, the reduction gearbox 301 and the control motherboard, resulting in higher heat dissipation efficiency. This can effectively dissipate the large amount of heat generated by the high-speed operation of the generator and the friction transmission of gears, effectively preventing accelerated aging, performance degradation, or even failure of components due to high temperatures, and significantly extending the service life of the device.

[0039] Please see Figures 2 to 8 Several metal heat-conducting strips 406 are fixedly connected to the upper surface of the motor top shell 2. The several metal heat-conducting strips 406 are evenly arranged in a straight array on the surface of the motor top shell 2. A dustproof mesh cover 412 is fixedly connected to the air inlet of the air inlet pipe 408. A control main board is fixedly connected inside the motor top shell 2. The annular ventilation pipe 410 is located directly above the gearbox 301 and the control main board.

[0040] The heat inside the motor top shell 2 is conducted to the outside through the metal heat-conducting strip 406, further improving the heat dissipation effect and finally forming a complete heat dissipation cycle. The dustproof mesh cover 412 at the air inlet pipe 408 can effectively block external dust and impurities from entering the device.

[0041] Please see Figures 4 to 5The lower surfaces of the second-stage transmission gear 311, the third-stage transmission gear 312, the fourth-stage transmission gear 313, and the fifth-stage transmission gear 314 are all fixedly connected to the second-stage reduction gear 315, the third-stage reduction gear 316, the fourth-stage reduction gear 317, and the fifth-stage reduction gear 318. The first-stage reduction gear 305 and the first-stage transmission gear 304 are coaxial, the second-stage reduction gear 315 and the second-stage transmission gear 311 are coaxial, the third-stage reduction gear 316 and the third-stage transmission gear 312 are coaxial, the fourth-stage reduction gear 317 and the fourth-stage transmission gear 313 are coaxial, and the fifth-stage reduction gear 318 and the fifth-stage transmission gear 314 are coaxial.

[0042] The first-stage reduction gear 305 has a diameter three times that of the drive gear 302, and the first-stage reduction gear 305 meshes with the drive gear 302. The second-stage reduction gear 315 has a diameter four times that of the first-stage transmission gear 304, and the second-stage reduction gear 315 meshes with the first-stage transmission gear 304. The third-stage reduction gear 316 has a diameter four times that of the second-stage transmission gear 311, and the third-stage reduction gear 316 meshes with the second-stage transmission gear 311. The fourth-stage reduction gear 317 has a diameter four times that of the third-stage transmission gear 312, and the fourth-stage reduction gear 317 meshes with the third-stage transmission gear 312.

[0043] It is worth noting that the reduction mechanism 3 adopts a multi-stage gear meshing transmission design, achieving efficient reduction through precise gear engagement. When the sampling motor body 1 starts, the output shaft drives the drive gear 302 to rotate. The drive gear 302 meshes with the first-stage reduction gear 305, transmitting power to the first transmission shaft 303. Since the first-stage reduction gear 305 and the first-stage transmission gear 304 are coaxial, power is synchronously transmitted to the first-stage transmission gear 304. The first-stage transmission gear 304 meshes with the second-stage reduction gear 315, driving the second-stage reduction gear 303 to rotate. The first-stage transmission shaft 306 rotates, and then transmits power to the third-stage reduction gear 316 through the second-stage transmission gear 311, driving the third-stage transmission shaft 307 to rotate. Subsequently, the third-stage transmission gear 312 meshes with the fourth-stage reduction gear 317, the fourth-stage transmission gear 313 meshes with the fifth-stage reduction gear 318, and the fifth-stage transmission gear 314 meshes with the driven gear 319. Through such step-by-step meshing transmission, the high-speed rotation of the sampling motor body 1 is gradually reduced, and finally transmitted to the driven shaft 310, driving the magnet ring 320 to rotate slowly.

[0044] Please see Figures 4 to 5The diameter of the fifth-stage reduction gear 318 is four times that of the fourth-stage transmission gear 313, and the fifth-stage reduction gear 318 meshes with the fourth-stage transmission gear 313. A driven gear 319 is fixedly connected to the surface of the driven shaft 310. The diameter of the driven gear 319 is twice that of the fifth-stage transmission gear 314, and the driven gear 319 meshes with the fifth-stage transmission gear 314. A magnet ring 320 is fixedly connected to the top of the driven shaft 310. A Hall sensor 321 is fixedly embedded in the inner top wall of the reduction gearbox 301. The Hall sensor 321 is located directly above the driven shaft 310, and the position of the Hall sensor 321 corresponds to that of the magnet ring 320.

[0045] It is worth noting that the multi-stage coaxial gear transmission design ensures the stability and accuracy of the transmission, avoiding problems such as slippage and large transmission errors that may occur with a single reduction structure. It can accurately convert the high-speed rotation of the sampling motor body 1 (up to 2000 r / min) into the slow rotation of the magnet ring 320 within 360°, making angle detection possible. Secondly, through the corresponding cooperation between the Hall sensor 321 and the magnet ring 320, the mechanical rotation angle of the magnet ring 320 can be converted into an electrical signal. After the electrical signal is transmitted to the control board, the control board can use a preset algorithm to reverse calculate the actual number of rotations of the sampling motor body 1, and then accurately memorize the dwell angle of the barrel. This completely solves the technical problems of the difficulty in reading the number of rotations of the high-speed motor and the inability to accurately memorize the position of the barrel, providing technical support for farmers to achieve "one-click return to the unloading position" and "one-click return to the receiving position".

[0046] Working principle: When the agricultural harvester needs to unload grain, the operator starts the device, the sampling motor body 1 starts to run, and its output shaft drives the drive gear 302 to rotate at a high speed of 2000r / min, thus officially starting the power transmission process. The drive gear 302 meshes with the first-stage reduction gear 305, transmitting power to the first drive shaft 303. The first-stage transmission gear 304 rotates synchronously with the first drive shaft 303 and meshes with the second-stage reduction gear 315, driving the second-stage transmission shaft 306 to rotate. The second-stage transmission gear 311 on the second-stage transmission shaft 306 meshes with the third-stage reduction gear 316, transmitting power to the third-stage transmission shaft 307. Subsequently, through the successive meshing of the third-stage transmission gear 312 with the fourth-stage reduction gear 317, and the fourth-stage transmission gear 313 with the fifth-stage reduction gear 318, the power is finally transmitted to the fifth-stage transmission shaft 309. The fifth-stage transmission gear 314 meshes with the driven gear 319 on the driven shaft 310, driving the driven shaft 310 and the top magnet ring 320 to rotate slowly. Through the coordinated transmission of the multi-stage gears, a high reduction ratio is achieved, allowing the rotation range of the magnet ring 320 to be precisely controlled within 360°. During the rotation of the magnetic ring 320, the Hall sensor 321 located directly above it continuously detects the angle change of the magnetic ring 320 and converts the detected mechanical angle signal into an electrical signal in real time. This electrical signal is transmitted to the control mainboard via wires. After receiving the electrical signal, the control mainboard analyzes and processes the signal using a built-in algorithm. Based on the preset reduction ratio parameters, it calculates the actual number of rotations of the sampling motor body 1, thereby accurately calculating the rotation angle of the unloading cannon barrel. When the unloading operation is completed and the barrel returns to its original position, the control mainboard retains the angle data from the last unloading operation. When unloading is required again, the operator only needs to operate a button, and the control mainboard can control the sampling motor body 1 to rotate precisely the corresponding number of times based on the memorized angle information, driving the barrel to quickly return to the previous unloading position without readjustment, greatly improving operational efficiency.

[0047] Meanwhile, during the entire operation of the reduction mechanism 3, the heat dissipation mechanism 4 starts working synchronously. When the secondary drive shaft 306 rotates, it drives the second synchronous pulley 404 to rotate, which in turn drives the first synchronous pulley 403 and the linkage shaft 402 to rotate via the drive belt 405. This causes the rotating impeller 407 to rotate at high speed inside the negative pressure fan duct 401, creating a negative pressure that adsorbs cold air from the outside. After being filtered by the dustproof mesh cover 412, the cold air enters the negative pressure fan duct 401 through the air inlet pipe 408, and is then transported to the annular ventilation pipe 410 through the exhaust pipe 409. Finally, it is blown towards the reduction gearbox 301 and the control main board through the evenly distributed ventilation holes 411, promptly removing the heat generated by the operation of the components.

Claims

1. A device for sampling the number of rotations of a motor, comprising a sampling motor body (1), characterized in that: The top of the sampling motor body (1) is fixedly connected to a motor top shell (2), and the motor top shell (2) is provided with a speed reduction mechanism (3) and a heat dissipation mechanism (4). The reduction mechanism (3) includes a reduction gearbox (301) disposed inside the motor top housing (2). The lower surface of the reduction gearbox (301) is fixedly connected to the top of the sampling motor body (1). The output shaft of the sampling motor body (1) extends into the interior of the reduction gearbox (301) and is fixedly connected to a drive gear (302). The inner bottom wall of the reduction gearbox (301) is rotatably connected to a first transmission shaft (303). A first-stage transmission gear (304) and a first-stage reduction gear are fixedly connected to the surface of the first transmission shaft (303). The gearbox (301) has a gear (305) and a gearbox (301) with a gearbox (305 ...

2. The device for sampling the number of rotations of a motor according to claim 1, characterized in that: The lower surfaces of the second-stage transmission gear (311), third-stage transmission gear (312), fourth-stage transmission gear (313), and fifth-stage transmission gear (314) are all fixedly connected to a second-stage reduction gear (315), a third-stage reduction gear (316), a fourth-stage reduction gear (317), and a fifth-stage reduction gear (318). The first-stage reduction gear (305) and the first-stage transmission gear (304) are coaxial. The second-stage reduction gear (315) and the second-stage transmission gear (311) are coaxial. The third-stage reduction gear (316) and the third-stage transmission gear (312) are coaxial. The fourth-stage reduction gear (317) and the fourth-stage transmission gear (313) are coaxial. The fifth-stage reduction gear (318) and the fifth-stage transmission gear (314) are coaxial.

3. The device for sampling the number of rotations of a motor according to claim 2, characterized in that: The first-stage reduction gear (305) has a diameter three times that of the drive gear (302), and the first-stage reduction gear (305) meshes with the drive gear (302). The second-stage reduction gear (315) has a diameter four times that of the first-stage transmission gear (304), and the second-stage reduction gear (315) meshes with the first-stage transmission gear (304).

4. The device for sampling the number of rotations of a motor according to claim 3, characterized in that: The diameter of the third-stage reduction gear (316) is four times that of the second-stage transmission gear (311), and the third-stage reduction gear (316) meshes with the second-stage transmission gear (311). The diameter of the fourth-stage reduction gear (317) is four times that of the third-stage transmission gear (312), and the fourth-stage reduction gear (317) meshes with the third-stage transmission gear (312).

5. The device for sampling the number of rotations of a motor according to claim 4, characterized in that: The diameter of the fifth-stage reduction gear (318) is four times that of the fourth-stage transmission gear (313), and the fifth-stage reduction gear (318) meshes with the fourth-stage transmission gear (313). A driven gear (319) is fixedly connected to the surface of the driven shaft (310). The diameter of the driven gear (319) is twice that of the fifth-stage transmission gear (314), and the driven gear (319) meshes with the fifth-stage transmission gear (314).

6. The device for sampling the number of rotations of a motor according to claim 5, characterized in that: A magnet ring (320) is fixedly connected to the top of the driven shaft (310), and a Hall sensor (321) is fixedly embedded in the inner top wall of the gearbox (301). The Hall sensor (321) is located directly above the driven shaft (310), and the position of the Hall sensor (321) corresponds to that of the magnet ring (320).

7. The device for sampling the number of rotations of a motor according to claim 1, characterized in that: The heat dissipation mechanism (4) includes a negative pressure fan duct (401) fixedly connected inside the motor top shell (2). A shaft hole is provided at the center of the upper surface of the negative pressure fan duct (401). A linkage shaft (402) is rotatably connected to the inner wall of the shaft hole. A first synchronous pulley (403) is fixedly connected to the top of the linkage shaft (402). The top of the secondary transmission shaft (306) extends to the outside of the reduction gearbox (301) and is fixedly connected to a second synchronous pulley (404). The height of the first synchronous pulley (403) corresponds to that of the second synchronous pulley (404). A transmission belt (405) is installed between the first synchronous pulley (403) and the second synchronous pulley (404). The first synchronous pulley (403) is connected to the second synchronous pulley (404) through the transmission belt (405).

8. The device for sampling the number of rotations of a motor according to claim 7, characterized in that: A rotating impeller (407) is fixedly connected to the surface of the linkage shaft (402). The rotating impeller (407) is located inside the negative pressure duct (401), and the air inlet end of the rotating impeller (407) faces the bottom of the negative pressure duct (401). An air inlet pipe (408) is fixedly embedded on the side of the negative pressure duct (401). The air inlet of the air inlet pipe (408) is located below the rotating impeller (407), and the air inlet end of the air inlet pipe (408) extends to the outside of the motor top shell (2).

9. The device for sampling the number of rotations of a motor according to claim 8, characterized in that: An exhaust pipe (409) is fixedly embedded on the upper surface of the negative pressure duct (401). The end of the exhaust pipe (409) away from the negative pressure duct (401) extends to the inner top wall of the motor top shell (2). An annular ventilation pipe (410) is fixedly connected to the inner top wall of the motor top shell (2). Several ventilation holes (411) are opened on the lower surface of the annular ventilation pipe (410). The several ventilation holes (411) are evenly distributed in a ring array on the surface of the annular ventilation pipe (410). The output end of the exhaust pipe (409) is fixedly connected to the input end of the annular ventilation pipe (410).

10. The device for sampling the number of rotations of a motor according to claim 9, characterized in that: The upper surface of the motor top shell (2) is fixedly connected with several metal heat-conducting strips (406), which are evenly arranged in a straight line array on the surface of the motor top shell (2). A dustproof mesh cover (412) is fixedly connected to the air inlet of the air inlet pipe (408). The inside of the motor top shell (2) is fixedly connected with a control main board. The annular ventilation pipe (410) is located directly above the gearbox (301) and the control main board.

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