Motor shaft structure suitable for high load

Abstract

The invention relates to the technical field of motor shafts, in particular to a high-load motor shaft structure which comprises a positioning component, an alignment device is slidably inserted into the front end of the positioning component, a motor support is fixedly mounted at the bottom end of the positioning component, and the alignment device comprises a first positioning ring, a limiting sleeve and a first coupler. The first positioning ring is fixedly mounted on an outer ring of the first coupler, the limiting sleeve is fixedly mounted in the first positioning ring and is annularly distributed, the positioning component comprises a connecting device, an extending device, a synchronizing device and a supporting device, and the extending device is fixedly mounted in the center of the front end of the supporting device; the connecting device is fixedly installed on the outer ring of the extending device, and the synchronizing devices are fixedly installed at the two ends of the supporting device. Through the arrangement of the alignment device and the positioning part, the exchange type alignment connection of the motor shaft and the synchronous heat dissipation of the motor shell are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor shafts, in particular to a motor shaft structure suitable for high loads. BACKGROUND

[0002] A motor is a device that converts electrical energy into mechanical energy and is widely used in industries, transportation, home appliances, etc.

[0003] The motor shaft is the core transmission component of the motor, responsible for transmitting the torque generated by the rotor to external loads (such as pulleys, gears, couplings, etc.), and its design, material and operating state directly affect the performance and life of the motor. The motor shaft can transmit the rotational power of the motor rotor to external mechanical devices (such as pumps, fans, machine tools, etc.).

[0004] Currently, the motor shafts on the market are connected using couplings when in use. When the motor shaft is running under high load, the coupling may experience keyway shearing or component fracture, resulting in motor operation failure. At the same time, under high load, instantaneous temperature is generated, causing the working temperature to rise rapidly, which affects the working state and service life of the equipment. Therefore, an improved device is needed to solve the above problems. SUMMARY

[0005] To solve the problems in the prior art, the present application provides a motor shaft structure suitable for high loads.

[0006] The technical scheme adopted by the present application to solve the technical problems is: a motor shaft structure suitable for high loads, comprising a positioning component, a positioning component The front end of the positioning component is slidably connected with a positioning device, and the bottom end of the positioning component is fixedly connected with a motor support. The positioning device comprises a first positioning ring, a limiting sleeve and a first coupling, the first positioning ring is fixedly installed on the outer ring of the first coupling, the limiting sleeve is fixedly installed inside the first positioning ring, and the limiting sleeve is annularly distributed. The positioning component comprises a connecting device, an extension device, a synchronization device and a supporting device, the extension device is fixedly installed at the front end center of the supporting device, the connecting device is fixedly installed on the outer ring of the extension device, and the synchronization device is fixedly installed on both ends of the supporting device.

[0007] Specifically, the connecting device includes a second positioning ring, a first spring, a connecting washer, a support base, a connecting rod, ball bearings, a first rack, and a connecting ring. The support base is symmetrically fixedly installed at the top and bottom of the rear end of the second positioning ring. The first spring is fixedly installed on the side end of the second positioning ring near the support base and is arranged in a ring. The connecting washer is fixedly installed at the end of the first spring away from the second positioning ring. The connecting rod is fixedly installed at the center of the connecting washer. The connecting ring is fixedly installed on the inner side of the connecting rod. The first rack is symmetrically fixedly installed on the connecting ring. The ball bearings are rotatably installed inside the connecting rod away from the second positioning ring.

[0008] Specifically, the extension device includes a second coupling, a second rack, a transmission gear, an extension bracket, a first plastic wheel, a motor shaft, a positioning key, and a movable key. The first plastic wheel is fixedly installed behind the outer ring of the motor shaft. The extension bracket is fixedly installed at the top and bottom of the outer ring of the motor shaft, and the extension bracket is located in front of the first plastic wheel. The transmission gear is rotatably installed at the inner end of the extension bracket away from the first plastic wheel. The positioning key is fixedly installed on both sides in front of the motor shaft. The movable key is slidably sleeved inside the positioning key. The second coupling is fixedly installed on the movable key. The second rack is symmetrically fixedly installed on the rear end of the second coupling near the first plastic wheel.

[0009] Specifically, the synchronization device includes a connecting rope, a second spring, a central base rod, a support frame, a displacement bracket, a second plastic wheel, and a fan blade. The central base rod is fixedly installed on the side end of the support frame. The displacement bracket is slidably sleeved on the outer ring of the central base rod and the support frame. The second spring is fixedly installed on the side end of the displacement bracket. The connecting rope is fixedly installed on the front end of the displacement bracket. The second plastic wheel is rotatably installed on the rear end of the displacement bracket. The fan blade is fixedly installed at the center of the rear end of the second plastic wheel.

[0010] Specifically, the support device includes a hydraulic cylinder, a contact ring, a front cover, a first guide wheel, a second guide wheel, an air guide cavity, a ventilation cavity, and a motor. The ventilation cavity is fixedly installed on both sides of the motor, the air guide cavity is fixedly installed at the front end of the ventilation cavity, the front cover is fixedly installed at the front end of the motor, the hydraulic cylinder is fixedly installed at the top and bottom of the front cover, the contact ring is fixedly installed between the two hydraulic cylinders, the first guide wheel is rotatably installed at the center of both sides of the contact ring, and the second guide wheel is rotatably installed at both sides of the front end of the front cover.

[0011] Specifically, the first coupling is slidably sleeved inside the front end of the second coupling, the support base is fixedly installed on the outer ring of the motor shaft, the first rack meshes with the top of the transmission gear, the support frame, the second spring and the end of the central base rod near the second spring are respectively connected to the side end of the front cover, the end of the connecting rope away from the support frame is connected to the front end of the front cover, and the motor shaft is fixedly set at the center of the front end of the motor.

[0012] Specifically, the contact ring has an arc groove at its front end, the connecting rope is in contact with the inner ring of the second guide wheel and the outer ring of the first guide wheel, the ventilation cavity is hollow inside, the air guide cavity and the ventilation cavity are interconnected, the second plastic wheel and the first plastic wheel are horizontally aligned, and the transmission ratio between the first plastic wheel and the second plastic wheel is 1:20.

[0013] Specifically, the second coupling has a through hole inside that matches the positioning key and the motor shaft. The positioning key has a groove at the center of its side end away from the motor shaft, and the movable key is slidably inserted into the groove. The connecting rod is horizontally aligned with the limiting sleeve, and the inner ring of the contact ring is spaced 2 cm apart from the first rack.

[0014] Specifically, the connecting rod is horizontally aligned with the contact ring, a circular hole is provided in the center of the front cover, a graphene plate is fixedly installed on the inner wall of the ventilation cavity near the motor, and the second spring is located on the outer ring of the central base rod.

[0015] Specifically, the front cover also includes a transparent protective cover and a connecting cover. The connecting cover is fixedly installed at the front center of the front cover, and the transparent protective cover is fixedly installed on the outer ring of the connecting cover.

[0016] The beneficial effects of this invention are:

[0017] (1) When the motor is under high load, the hydraulic cylinder can be turned on and driven to move the contact ring to the front end, so that the extrudable connecting rod can move to the front end, so that the connecting rod can be inserted into the inside of the limiting sleeve. At the same time, the connecting rod can also drive the transmission gear to rotate through the first rack, so that the second rack can drive the second coupling to move to the rear end, so that the second coupling can disengage from the first coupling and avoid the keyway inside the first coupling and the second coupling from breaking under high load. Furthermore, by inserting multiple connecting rods into the inside of the limiting sleeve at the same time, the first coupling and the motor shaft can be continuously connected, and the second coupling and the first coupling can be interchanged and aligned.

[0018] (2) When the contact ring is displaced, the first guide wheel can pull the connecting rope to move the displacement bracket towards the center of the front cover, so that the second plastic wheel can fit with the first plastic wheel. Thus, when the motor shaft rotates, the first plastic wheel can drive the second plastic wheel and the fan blade to rotate. Furthermore, when the displacement bracket is pulled to the limit position, the fan blade can be aligned with the air guide cavity, so that the fan blade can send air into the interior of the ventilation cavity, thereby completing the work of rapidly cooling the surface of the motor and the inner wall of the ventilation cavity. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the alignment device from the front view in this invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the positioning component from a frontal view in this invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the connecting device from the rear view in this invention;

[0024] Figure 5 This is a partial cross-sectional schematic diagram of the extension device in this invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the synchronization device from a frontal perspective in this invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the support device from the front view in this invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the front end cover from the front view in the second embodiment of the present invention.

[0028] In the diagram: 1-Alignment device, 2-Positioning component, 3-Motor support, 4-First positioning ring, 5-Restricting sleeve, 6-First coupling, 7-Connecting device, 8-Extension device, 9-Synchronizing device, 10-Supporting device, 11-Second positioning ring, 12-First spring, 13-Connecting washer, 14-Supporting base, 15-Connecting rod, 16-Ball bearing, 17-First rack, 18-Connecting ring, 19-Second coupling, 20-Second rack, 21-Transmission gear, 22-Extension 23-Extend bracket, 24-First plastic wheel, 25-Motor shaft, 26-Positioning key, 27-Moving key, 28-Connecting rope, 29-Second spring, 30-Central base rod, 31-Support frame, 32-Displacement bracket, 33-Second plastic wheel, 34-Fan blade, 35-Hydraulic cylinder, 36-Contact ring, 37-Front end cover, 38-First guide wheel, 39-Second guide wheel, 40-Ventilation chamber, 41-Motor, 42-Transparent protective cover, 43-Connecting cover. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] The invention will be further described below with reference to the accompanying drawings.

[0031] Example 1

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, a motor shaft structure suitable for high loads according to the present invention includes a positioning component 2. An alignment device 1 is slidably inserted into the front end of the positioning component 2. A motor support 3 is fixedly installed at the bottom end of the positioning component 2. The alignment device 1 includes a first positioning ring 4, a limiting sleeve 5, and a first coupling 6. The first positioning ring 4 is fixedly installed on the outer ring of the first coupling 6, and the limiting sleeve 5 is fixedly installed inside the first positioning ring 4 and is arranged in a ring. The positioning component 2 includes a connecting device 7, an extension device 8, a synchronizing device 9, and a supporting device 10. The extension device 8 is fixedly installed at the front end center of the supporting device 10, the connecting device 7 is fixedly installed on the outer ring of the extension device 8, and the synchronizing device 9 is fixedly installed on both ends of the supporting device 10.

[0033] like Figure 4The connecting device 7 includes a second positioning ring 11, a first spring 12, a connecting washer 13, a support base 14, a connecting rod 15, a ball bearing 16, a first rack 17, and a connecting ring 18. The support base 14 is symmetrically fixedly installed at the top and bottom of the rear end of the second positioning ring 11. The first spring 12 is fixedly installed on the side end of the second positioning ring 11 near the support base 14, and the first spring 12 is distributed in a ring. The connecting washer 13 is fixedly installed at the end of the first spring 12 away from the second positioning ring 11. The connecting rod 15 is fixedly installed at the center of the connecting washer 13. The connecting ring 18 is fixedly installed on the inner side of the connecting rod 15. The first rack 17 is symmetrically fixedly installed on the connecting ring 18. The ball bearing 16 is rotatably installed inside the connecting rod 15 away from the second positioning ring 11. The bottom end of the first rack 17 will not contact the top end of the second coupling 19, so that interference between the first rack 17 and the second coupling 19 can be avoided.

[0034] like Figure 5 The extension device 8 includes a second coupling 19, a second rack 20, a transmission gear 21, an extension bracket 22, a first plastic wheel 23, a motor shaft 24, a positioning key 25, and a movable key 26. The first plastic wheel 23 is fixedly installed behind the outer ring of the motor shaft 24. The extension bracket 22 is fixedly installed at the top and bottom of the outer ring of the motor shaft 24, and the extension bracket 22 is located in front of the first plastic wheel 23. The transmission gear 21 is rotatably installed at one end of the extension bracket 22 away from the first plastic wheel 23. The positioning key 25 is fixedly installed on both sides in front of the motor shaft 24. The movable key 26 is slidably sleeved inside the positioning key 25. The second coupling 19 is fixedly installed on the movable key 26. The second rack 20 is symmetrically fixedly installed on the rear end of the second coupling 19 near the first plastic wheel 23. When the second coupling 19 is disengaged from the first coupling 6, it will not contact the transmission gear 21, thus avoiding interference between the second coupling 19 and the transmission gear 21.

[0035] like Figure 6 The synchronization device 9 includes a connecting rope 27, a second spring 28, a central base rod 29, a support frame 30, a displacement bracket 31, a second plastic wheel 32, and a fan blade 33. The central base rod 29 is fixedly installed on the side end of the support frame 30. The displacement bracket 31 is slidably sleeved on the outer ring of the central base rod 29 and the support frame 30. The second spring 28 is fixedly installed on the side end of the displacement bracket 31. The connecting rope 27 is fixedly installed on the front end of the displacement bracket 31. The second plastic wheel 32 is rotatably installed on the rear end of the displacement bracket 31. The fan blade 33 is fixedly installed at the center of the rear end of the second plastic wheel 32.

[0036] like Figure 7The support device 10 includes a hydraulic cylinder 34, a contact ring 35, a front cover 36, a first guide wheel 37, a second guide wheel 38, an air guide cavity 39, a ventilation cavity 40, and a motor 41. The ventilation cavity 40 is fixedly installed on both sides of the motor 41, the air guide cavity 39 is fixedly installed at the front end of the ventilation cavity 40, the front cover 36 is fixedly installed at the front end of the motor 41, the hydraulic cylinder 34 is fixedly installed at the top and bottom ends of the front cover 36, the contact ring 35 is fixedly installed between the two hydraulic cylinders 34, and the first guide wheel 37 is rotatably installed on both sides of the contact ring 35. At the center, the second guide wheel 38 is rotatably mounted on both sides of the front end of the front cover 36. When the connecting rope 27 is not pulled, the second spring 28 can drive the fan blade 33 to move to a position that is misaligned with the air guide cavity 39, so that air can enter the ventilation cavity 40 normally. Through the contact between the first guide wheel 37 and the surface of the connecting rope 27, the contact ring 35 can be moved by pulling the connecting rope 27 to move the displacement bracket 31 when it is displaced. At the same time, the connecting rope 27 is always in a taut state, so that the connecting rope 27 can be prevented from falling off.

[0037] The first coupling 6 is slidably sleeved inside the front end of the second coupling 19. The support frame 14 is fixedly installed on the outer ring of the motor shaft 24. The first rack 17 meshes with the top of the transmission gear 21. The support frame 30, the second spring 28, and the central base rod 29 are respectively connected to the side end of the front cover 36 near the second spring 28. The end of the connecting rope 27 away from the support frame 30 is connected to the front end of the front cover 36. The motor shaft 24 is fixedly set at the front center of the motor 41. The front end of the contact ring 35 is provided with an arc groove. The connecting rope 27 fits against the inner ring of the second guide wheel 38 and the outer ring of the first guide wheel 37. The interior of the ventilation cavity 40 is hollow. The air guide cavity 39 and the interior of the ventilation cavity 40 are mutually... The second plastic wheel 32 is horizontally aligned with the first plastic wheel 23, and the transmission ratio between the first plastic wheel 23 and the second plastic wheel 32 is 1:20. The second coupling 19 has a through hole inside that matches the positioning key 25 and the motor shaft 24. The positioning key 25 has a groove at the center of the side end away from the motor shaft 24, and the movable key 26 is slidably inserted into the groove. The connecting rod 15 is horizontally aligned with the limiting sleeve 5. The inner ring of the contact ring 35 is spaced 2 cm apart from the first rack 17. The connecting rod 15 is horizontally aligned with the contact ring 35. The center of the front cover 36 has a round hole. A graphene plate is fixedly installed on the inner wall of the ventilation cavity 40 near the motor 41. The second spring 28 is located on the outer ring of the central base rod 29.

[0038] The working principle of Example 1 is as follows: In use, the motor support 3 is first installed in the designated working area, and then the first coupling 6 is connected to the external component requiring transmission. The first coupling 6 and the second coupling 19 are in a meshing state. When the motor 41 is running, it can drive the motor shaft 24, the second coupling 19, and the first coupling 6 to rotate, thereby achieving power transmission. When the motor 41 is running under high load, the hydraulic cylinder 34 can be opened, which can drive the contact ring 35 to move forward. When the contact ring 35 moves forward, it can squeeze the connecting rod 15 to move forward as well. The ball bearing 16 contacts the arc groove at the front end of the contact ring 35, allowing the motor shaft 24 to continuously drive multiple connecting rods 15 to rotate. At this time... When the connecting rod 15 moves forward, it can enter the interior of the limiting sleeve 5. Simultaneously, this forward movement of the connecting rod 15 drives the first rack 17 to move. The first rack 17 meshes with the second rack 20, allowing the first rack 17 to move forward, which in turn drives the second rack 20 to move backward via the transmission gear 21. This disengages the second coupling 19 from the first coupling 6, preventing breakage of the teeth between the first coupling 6 and the second coupling 19. Simultaneously, when the second coupling 19 moves backward, the movable key 26 slides within the groove on the side of the positioning key 25, supporting the second coupling 19 to move linearly, thus completing the docking of the connecting rod 15 with the limiting sleeve 5. When the contact ring 35 moves towards the front end, it can also drive the first guide wheel 37 to pull the connecting rope 27. The end of the connecting rope 27 away from the support frame 30 is connected to the front end of the front cover 36, so that when the connecting rope 27 is pulled, it can pull the displacement bracket 31 to move. By the connecting rope 27 wrapping around the inner ring of the second guide wheel 38, the connecting rope 27 can pull the displacement bracket 31 towards the center of the front cover 36 with the second guide wheel 38 as the base point, until the contact ring 35 moves to the limit position towards the front end. At this time, the second plastic wheel 32 can move to fit with the first plastic wheel 23, and the fan blade 33 can be horizontally aligned with the air guide cavity 39. At this time, when the motor shaft 24 is rotating, it can pass through the first plastic wheel 23 drives the second plastic wheel 32 and fan blade 33 to rotate, so that the fan blade 33 can send air into the interior of the air guide cavity 39. The air guide cavity 39 is interconnected with the interior of the ventilation cavity 40, allowing air to pass through the interior of the ventilation cavity 40. A graphene plate is installed on the inner wall of the ventilation cavity 40 near the motor 41, so that the heat on the outer shell of the motor 41 can be quickly absorbed by the graphene plate inside the ventilation cavity 40. Furthermore, when the air passes through the interior of the ventilation cavity 40, it can quickly dissipate the heat on the graphene plate, thus completing the work of rapid heat dissipation on the surface of the motor 41. When the motor 41 does not need to perform high-load operation, the hydraulic cylinder 34 can be opened again, driving the contact ring 35 to return to the rear end. At this time, the connecting rod 15 will lose the compressive force.The elasticity of the first spring 12 causes the connecting washer 13 and connecting rod 15 to return to their rearward position. Simultaneously, the first rack 17, via the transmission gear 21, drives the second rack 20 to move forward, allowing the second coupling 19 to re-engage with the first coupling 6. This facilitates the motor shaft 24 driving the second coupling 19 and the first coupling 6 to rotate again. Simultaneously, when the contact ring 35 moves backward to its reset position, it releases the connecting rope 27. The elasticity of the second spring 28 causes the displacement bracket 31 to move away from the center of the front cover 36, disengaging the second plastic wheel 32 from the first plastic wheel 23. This allows air to enter the ventilation cavity 40 in a normal amount, completing the operation.

[0039] Example 2

[0040] Based on Example 1, such as Figure 8 As shown, the front cover 36 also includes a transparent protective cover 42 and a connecting cover 43. The connecting cover 43 is fixedly installed at the front center of the front cover 36, and the transparent protective cover 42 is fixedly installed on the outer ring of the connecting cover 43.

[0041] In implementing this embodiment, the connecting cover 43 is installed on the front end of the front end cover 36, so that the transparent protective cover 42 and the connecting cover 43 can completely cover the connecting device 7 and the extension device 8, preventing external objects from contacting the rotating parts inside the device, improving the safety of the motor 41 during operation. At the same time, the transparent protective cover 42 allows the user to easily observe the status of the device during operation, and also allows the user to intuitively understand whether there are any problems with the rotating parts of the device without disassembling it, thus completing the work.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motor shaft structure suitable for high loads, comprising a positioning component (2), wherein an alignment device (1) is slidably inserted into the front end of the positioning component (2), and a motor support (3) is fixedly installed at the bottom end of the positioning component (2), characterized in that: The alignment device (1) includes a first positioning ring (4), a limiting sleeve (5), and a first coupling (6). The first positioning ring (4) is fixedly installed on the outer ring of the first coupling (6). The limiting sleeve (5) is fixedly installed inside the first positioning ring (4) and the limiting sleeve (5) is arranged in a ring. The positioning component (2) includes a connecting device (7), an extension device (8), a synchronizing device (9), and a supporting device (10). The extension device (8) is fixedly installed at the front end center of the supporting device (10). The connecting device (7) is fixedly installed on the outer ring of the extension device (8). The synchronizing device (9) is fixedly installed at both ends of the supporting device (10).

2. The motor shaft structure suitable for high loads according to claim 1, characterized in that: The connecting device (7) includes a second positioning ring (11), a first spring (12), a connecting washer (13), a support base (14), a connecting rod (15), a ball (16), a first rack (17), and a connecting ring (18). The support base (14) is symmetrically fixedly installed at the top and bottom of the rear end of the second positioning ring (11). The first spring (12) is fixedly installed on the side end of the second positioning ring (11) near the support base (14), and the first spring (12) is distributed in a ring. The connecting washer (13) is fixedly installed at the end of the first spring (12) away from the second positioning ring (11). The connecting rod (15) is fixedly installed at the center of the connecting washer (13). The connecting ring (18) is fixedly installed on the inner side of the connecting rod (15). The first rack (17) is symmetrically fixedly installed on the connecting ring (18). The ball (16) is rotatably installed inside the connecting rod (15) away from the second positioning ring (11).

3. A motor shaft structure suitable for high loads according to claim 2, characterized in that: The extension device (8) includes a second coupling (19), a second rack (20), a transmission gear (21), an extension bracket (22), a first plastic wheel (23), a motor shaft (24), a positioning key (25), and a movable key (26). The first plastic wheel (23) is fixedly installed behind the outer ring of the motor shaft (24). The extension bracket (22) is fixedly installed at the top and bottom of the outer ring of the motor shaft (24), and the extension bracket (22) is located in front of the first plastic wheel (23). The transmission gear (21) is rotatably installed at one end of the extension bracket (22) away from the first plastic wheel (23). The positioning key (25) is fixedly installed on both sides in front of the motor shaft (24). The movable key (26) is slidably sleeved inside the positioning key (25). The second coupling (19) is fixedly installed on the movable key (26). The second rack (20) is symmetrically fixedly installed on the rear end of the second coupling (19) near the first plastic wheel (23).

4. A motor shaft structure suitable for high loads according to claim 3, characterized in that: The synchronization device (9) includes a connecting rope (27), a second spring (28), a central base rod (29), a support frame (30), a displacement bracket (31), a second plastic wheel (32), and a fan blade (33). The central base rod (29) is fixedly installed on the side end of the support frame (30). The displacement bracket (31) is slidably sleeved on the outer ring of the central base rod (29) and the support frame (30). The second spring (28) is fixedly installed on the side end of the displacement bracket (31). The connecting rope (27) is fixedly installed on the front end of the displacement bracket (31). The second plastic wheel (32) is rotatably installed on the rear end of the displacement bracket (31). The fan blade (33) is fixedly installed at the center of the rear end of the second plastic wheel (32).

5. A motor shaft structure suitable for high loads according to claim 4, characterized in that: The support device (10) includes a hydraulic cylinder (34), a contact ring (35), a front cover (36), a first guide wheel (37), a second guide wheel (38), an air guide cavity (39), a ventilation cavity (40), and a motor (41). The ventilation cavity (40) is fixedly installed on both sides of the motor (41). The air guide cavity (39) is fixedly installed at the front end of the ventilation cavity (40). The front cover (36) is fixedly installed at the front end of the motor (41). The hydraulic cylinder (34) is fixedly installed at the top and bottom of the front cover (36). The contact ring (35) is fixedly installed between the two hydraulic cylinders (34). The first guide wheel (37) is rotatably installed at the center of both sides of the contact ring (35). The second guide wheel (38) is rotatably installed at both sides of the front end of the front cover (36).

6. A motor shaft structure suitable for high loads according to claim 5, characterized in that: The first coupling (6) is slidably sleeved inside the front end of the second coupling (19). The support base frame (14) is fixedly installed on the outer ring of the motor shaft (24). The first rack (17) meshes with the top of the transmission gear (21). The support frame (30), the second spring (28) and the center base rod (29) are respectively connected to the side end of the front cover (36) at the end of the second spring (28). The connecting rope (27) is connected to the front end of the front cover (36) at the end away from the support frame (30). The motor shaft (24) is fixedly installed at the front center of the motor (41).

7. A motor shaft structure suitable for high loads according to claim 6, characterized in that: The contact ring (35) has an arc groove at its front end. The connecting rope (27) fits into the inner ring of the second guide wheel (38) and the outer ring of the first guide wheel (37). The ventilation cavity (40) is hollow inside. The air guide cavity (39) is interconnected with the ventilation cavity (40). The second plastic wheel (32) is horizontally aligned with the first plastic wheel (23), and the transmission ratio between the first plastic wheel (23) and the second plastic wheel (32) is 1:

20.

8. A motor shaft structure suitable for high loads according to claim 7, characterized in that: The second coupling (19) has a through hole inside that is compatible with the positioning key (25) and the motor shaft (24). The positioning key (25) has a groove at the center of the side end away from the motor shaft (24), and the movable key (26) is slidably inserted into the groove. The connecting rod (15) is horizontally aligned with the limiting sleeve (5), and the inner ring of the contact ring (35) is spaced 2 cm apart from the first rack (17).

9. A motor shaft structure suitable for high loads according to claim 8, characterized in that: The connecting rod (15) is horizontally aligned with the contact ring (35), the center of the front cover (36) has a round hole, the ventilation cavity (40) is fixedly installed with a graphene plate on the inner wall near the motor (41), and the second spring (28) is located on the outer ring of the central base rod (29).

10. A motor shaft structure suitable for high loads according to claim 9, characterized in that: The front cover (36) also includes a transparent protective cover (42) and a connecting cover (43). The connecting cover (43) is fixedly installed at the front center of the front cover (36), and the transparent protective cover (42) is fixedly installed on the outer ring of the connecting cover (43).

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