High-efficiency energy-saving transmission device and nanometer sand mill

Abstract

This invention discloses a high-efficiency energy-saving transmission device and a nano-sand mill, relating to the field of sand mill technology. It includes: a high-frequency alternating magnetic field generating ring, which is composed of a device shell and a micro-coil array uniformly installed on the inner wall of the device shell; and a multi-level piezoelectric fiber composite material ring disposed inside the high-frequency alternating magnetic field generating ring, which is composed of a flexible epoxy matrix and piezoelectric ceramic fibers embedded in the flexible epoxy matrix arranged in an array along the circumferential and axial directions. The flexible epoxy matrix is ​​connected to the device shell via a connecting plate. This invention can achieve integrated vibration energy recovery and active suppression, reducing vibration damage and achieving the dual goals of energy saving and stable operation. It also features a dual-mode energy storage (electric and mechanical) and dual-path energy recovery energy saving mode, making the energy saving path more efficient.

Description

Technical Field

[0001] This invention relates to the field of sand mill technology, and in particular to a high-efficiency and energy-saving transmission device and a nano sand mill. Background Technology

[0002] In a nano-sand mill system, the energy efficiency and operational stability of the transmission device directly determine the equipment's production efficiency, service life, and operating costs.

[0003] In actual operation, core components such as connecting shafts inevitably experience irregular, wide-band mechanical vibrations due to load fluctuations, material impacts, and collisions with grinding media. These vibrations not only cause a significant amount of energy to be lost as heat, but also exacerbate bearing wear, reduce transmission accuracy, and even trigger structural resonance, severely impacting the stability of equipment operation. Traditional vibration reduction methods often employ passive vibration reduction structures such as rubber pads and dampers, which can only buffer vibrations but cannot recover and utilize vibration energy, resulting in the dual problems of energy waste and vibration hazards.

[0004] In addition, the connecting shaft of equipment such as nano-sand mills is under a large load during the start-up phase, requiring the main drive unit to output more power, resulting in high start-up energy consumption; while during the deceleration and braking phase, the system's inertial kinetic energy is mostly dissipated through the braking device and is not effectively recovered, further aggravating energy waste. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-efficiency and energy-saving transmission device and a nano-sand mill.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-efficiency and energy-saving transmission device includes: a high-frequency alternating magnetic field generating ring, wherein the high-frequency alternating magnetic field generating ring is composed of a device shell and a micro-coil array uniformly installed on the inner wall of the device shell; A multi-level piezoelectric fiber composite ring is disposed inside the high-frequency alternating magnetic field generating ring. The multi-level piezoelectric fiber composite ring is composed of a flexible epoxy matrix and piezoelectric ceramic fibers embedded in the flexible epoxy matrix arranged in an array along the circumferential and axial directions. The flexible epoxy matrix is ​​connected to the device shell through a connecting plate. A magnetostrictive bushing is disposed on the inner side of the multi-level piezoelectric fiber composite material ring. The magnetostrictive bushing is composed of an outer ring, an inner ring, and a magnetostrictive material uniformly embedded between the outer ring and the inner ring. A connecting shaft is fixed to the inner side of the inner ring; An auxiliary drive mechanism is located below the connecting shaft; An energy management unit is provided, wherein the input end of the energy management unit is connected to a multi-level piezoelectric fiber composite material ring via a first connecting line, and the output end of the energy management unit is connected to a high-frequency alternating magnetic field generating ring and an auxiliary drive mechanism via a second connecting line and a third connecting line, respectively.

[0007] As a further improvement of the present invention, the auxiliary drive mechanism includes a fixed base, the upper end of the fixed base is provided with a first mounting groove, the interior of the first mounting groove is provided with a movable seat, the inner bottom of the first mounting groove is provided with a first electric push rod, the telescopic end of the first electric push rod is fixed to the bottom of the movable seat, the upper end of the movable seat is provided with a second mounting groove, the interior of the second mounting groove is provided with a mounting frame, the inner bottom of the second mounting groove is provided with a reversing motor, the output shaft of the reversing motor is fixed to the bottom of the mounting frame, and the mounting frame is provided with a drive structure.

[0008] As a further improvement of the present invention, a support column is fixed to the bottom of the device housing, and two fixing plates are fixed to the side wall of the fixing seat, the fixing plates being fixed to the side wall of the support column.

[0009] As a further improvement of the present invention, the drive structure includes a rotating shaft that passes through a mounting frame and is rotatably connected to the mounting frame. An auxiliary drive motor is mounted on one side wall of the mounting frame. The output shaft of the auxiliary drive motor is fixedly connected to the end of the rotating shaft. The auxiliary drive motor is connected to a third connecting line. An energy storage spring is fixed to the end of the rotating shaft away from the auxiliary drive motor. The end of the energy storage spring away from the rotating shaft is fixed to the side wall of the mounting frame. A friction wheel is fixedly sleeved on the rotating shaft. Limiting grooves are evenly distributed circumferentially on the side wall of the friction wheel. A third mounting groove is provided on the mounting frame. A limiting member that cooperates with the limiting groove is provided inside the third mounting groove. A friction ring that cooperates with the friction wheel is fixedly sleeved on the connecting shaft.

[0010] As a further improvement of the present invention, the limiting member includes a movable block disposed inside the third mounting groove. A second electric push rod is installed at the bottom of the inner side of the third mounting groove. The telescopic end of the second electric push rod is fixed to the bottom of the movable block. A movable groove is provided at the upper end of the movable block. A limiting block and a spring are provided inside the movable groove. One end of the spring is fixed to the bottom of the limiting block, and the other end of the spring is fixed to the bottom of the movable groove.

[0011] As a further improvement of the present invention, a protective cover is fixed on the side wall of the mounting bracket to cover the outside of the energy storage spring.

[0012] As a further improvement of the present invention, the limiting block is a cuboid structure in whole, and the end of the limiting block away from the spring has an inclined surface.

[0013] As a further improvement of the present invention, a flexible coupling is installed at one end of the connecting shaft.

[0014] A nano-sand mill includes the aforementioned high-efficiency and energy-saving transmission device.

[0015] The beneficial effects of this invention are: The irregular vibration of the connecting shaft is converted into magnetic field fluctuations by the magnetostrictive material of the magnetostrictive bushing, and then collected as electrical energy by the multi-level piezoelectric fiber composite ring. This recovered electrical energy is directly supplied to the micro-coil array of the high-frequency alternating magnetic field generating ring through the energy management unit and the second connecting line. The generated high-frequency alternating magnetic field interacts with the fluctuating magnetic field of the magnetostrictive material, which can actively suppress excessive and harmful vibration of the connecting shaft from the electromagnetic level. The self-powered closed loop of generating energy from vibration and using this energy to suppress vibration not only reduces the damage of vibration to the bearing and structure, but also achieves the dual purpose of energy saving and stable operation.

[0016] Not only does it recover energy for its own vibration control, but it also directly uses surplus energy for auxiliary drive. When the connecting shaft starts, the energy management unit supplies power to the auxiliary drive motor through the third connecting line and controls the first electric push rod to raise the movable seat, so that the friction wheel and the friction ring are pressed together. At the same time, it controls the second electric push rod to retract, so that the limit block is disengaged from the limit groove. At this time, the mechanical energy stored in the energy storage spring and the electrical energy of the auxiliary drive motor drive the shaft and the friction wheel together, providing direct torque assistance to the connecting shaft. This process feeds back the energy recovered inside the system to the main drive system in real time, directly reducing the energy consumption of the main drive unit and making the energy-saving path more efficient.

[0017] When the connecting shaft decelerates and brakes, the system's inertial kinetic energy is converted into the elastic potential energy of the spring and stored. This mechanical energy storage method has a rapid response and low loss, providing an immediate energy source for the next auxiliary drive. Combined with the aforementioned electric energy recovery system, it forms an energy-saving mode of dual-mode electric and mechanical energy storage and dual-path recovery. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a high-efficiency and energy-saving transmission device proposed in this invention; Figure 2 This is a schematic diagram of the structure of a multi-stage piezoelectric fiber composite material ring for a high-efficiency and energy-saving transmission device proposed in this invention; Figure 3 This is a schematic diagram of the structure of a magnetostrictive bushing for a high-efficiency and energy-saving transmission device proposed in this invention; Figure 4 This is a schematic diagram of the structure of the first electric push rod, movable seat, second mounting groove, mounting bracket, drive structure, connecting shaft, and friction ring of a high-efficiency and energy-saving transmission device proposed in this invention. Figure 5This is a schematic diagram of the commutation motor, mounting bracket, and third mounting slot of a high-efficiency and energy-saving transmission device proposed in this invention. Figure 6 This is a schematic diagram of the drive structure of a high-efficiency and energy-saving transmission device proposed in this invention; Figure 7 This is a schematic diagram of the limiting block and spring of a high-efficiency and energy-saving transmission device proposed in this invention; Figure 8 This is a schematic diagram of the structure of a nano-sand mill proposed in this invention.

[0019] In the diagram: 1. Device housing; 2. Micro-coil array; 3. Connecting shaft; 4. First connecting line; 5. Energy management unit; 6. Support column; 7. Second connecting line; 8. Third connecting line; 9. Fixing plate; 10. Fixing seat; 11. First mounting slot; 12. Movable seat; 13. Mounting bracket; 14. Flexible coupling; 15. Friction ring; 16. Connecting plate; 17. Flexible epoxy matrix; 18. Piezoelectric ceramic fiber; 19. Outer ring; 20. Magnetostrictive material; 21. Inner ring; 22. First electric push rod; 23. Second mounting slot; 24. Protective cover; 25. Friction wheel; 26. Auxiliary drive motor; 27. Third mounting slot; 28. Reversing motor; 29. ​​Limiting slot; 30. Rotating shaft; 31. Energy storage spring; 32. Second electric push rod; 33. Moving block; 34. Movable slot; 35. Limiting block; 36. Spring. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] See Figures 1-7 A high-efficiency and energy-saving transmission device includes: a high-frequency alternating magnetic field generating ring, which is composed of a device shell 1 and a micro coil array 2 uniformly installed on the inner wall of the device shell 1. A support column 6 is fixed at the bottom of the device shell 1, and two fixing plates 9 are fixed on the side wall of the fixing seat 10. The fixing plates 9 are fixed on the side wall of the support column 6.

[0022] A multi-level piezoelectric fiber composite ring is disposed inside the high-frequency alternating magnetic field generating ring. The multi-level piezoelectric fiber composite ring consists of a flexible epoxy matrix 17 and piezoelectric ceramic fibers 18 arranged in an array along the circumference and axial direction and embedded in the flexible epoxy matrix 17. The flexible epoxy matrix 17 is connected to the device shell 1 through a connecting plate 16. The fluctuating magnetic field generated by the magnetostrictive bushing cuts the multi-level piezoelectric fiber composite ring around it. The piezoelectric ceramic fibers 18 generate an electromotive force under the action of the changing magnetic field (an extended application of the piezoelectric effect). The electrical energy collected by the piezoelectric ceramic fibers 18 is introduced into the energy management unit 5 for collection. Part of the collected energy is used for the high-frequency alternating magnetic field generating ring. The high-frequency alternating magnetic field generating ring generates a controlled high-frequency alternating magnetic field. This magnetic field interacts with the fluctuating magnetic field of the magnetostrictive bushing. Under a specific phase, the external magnetic field can enhance the deformation of the magnetostrictive material 20, forming a weak "magnetostrictive drive" that slightly but continuously resists harmful vibrations, which is equivalent to providing active damping for the shaft system from the electromagnetic level. The other part of the energy is used for auxiliary drive mechanism.

[0023] A magnetostrictive bushing, disposed inside a multi-stage piezoelectric fiber composite ring, comprises an outer ring 19, an inner ring 21, and a magnetostrictive material 20 uniformly embedded between the outer ring 19 and the inner ring 21. The magnetostrictive bushing rotates synchronously with the connecting shaft 3. The irregular, broadband mechanical vibration experienced by the connecting shaft 3 is directly transmitted to the magnetostrictive bushing, causing it to undergo micro-deformation. Utilizing the inverse magnetostrictive effect (Villarley effect) of the magnetostrictive material 20—that changes in internal mechanical stress lead to changes in magnetization—the vibration of the connecting shaft 3 is converted into synchronous high-frequency fluctuations of the magnetic flux within the magnetostrictive bushing.

[0024] The connecting shaft 3 is fixed to the inner side of the inner ring 21. A flexible coupling 14 is installed at one end of the connecting shaft 3. The flexible coupling 14 realizes soft transmission and can prevent the vibration of the connecting shaft 3 from being transmitted to the main drive equipment.

[0025] An auxiliary drive mechanism is located below the connecting shaft 3. The auxiliary drive mechanism includes a fixed base 10. The upper end of the fixed base 10 is provided with a first mounting groove 11. The interior of the first mounting groove 11 is provided with a movable base 12. The inner bottom of the first mounting groove 11 is provided with a first electric push rod 22. The telescopic end of the first electric push rod 22 is fixed to the bottom of the movable base 12. The upper end of the movable base 12 is provided with a second mounting groove 23. The interior of the second mounting groove 23 is provided with a mounting frame 13. The inner bottom of the second mounting groove 23 is provided with a reversing motor 28. The output shaft of the reversing motor 28 is fixed to the bottom of the mounting frame 13. The mounting frame 13 is provided with a drive structure. Since the rotation direction of the rotating shaft 30 is different during the energy storage process and the energy release process of the energy storage spring 31, while the rotation direction of the connecting shaft 3 is the same during the start-up and deceleration and stop, it is necessary to drive the mounting frame 13 through the reversing motor 28 to achieve the purpose of adjusting the direction of the friction wheel 25 so that the direction of the friction wheel 25 can meet the needs of different working conditions.

[0026] The drive structure includes a rotating shaft 30, which passes through and is rotatably connected to a mounting frame 13. An auxiliary drive motor 26 is mounted on one side wall of the mounting frame 13. The output shaft of the auxiliary drive motor 26 is fixedly connected to the end of the rotating shaft 30. The auxiliary drive motor 26 is connected to a third connecting line 8. An energy storage spring 31 is fixed to the end of the rotating shaft 30 away from the auxiliary drive motor 26. The end of the energy storage spring 31 away from the rotating shaft 30 is fixed to the side wall of the mounting frame 13. A protective cover 24 is fixed to the side wall of the mounting frame 13, covering the outside of the energy storage spring 31. The protective cover 24 can protect the outside of the energy storage spring 31. A friction wheel 25 is fixedly sleeved on the rotating shaft 30. The side wall of the friction wheel 25 has... Limiting grooves 29 are evenly distributed circumferentially. The mounting bracket 13 is provided with a third mounting groove 27. The interior of the third mounting groove 27 is provided with a limiting component that cooperates with the limiting grooves 29. A friction ring 15 that cooperates with the friction wheel 25 is fixedly sleeved on the connecting shaft 3. Through the contact between the friction wheel 25 and the friction ring 15, when the connecting shaft 3 is started (with a large load), the auxiliary drive motor 26 drives the rotating shaft 30. At the same time, the energy storage spring 31 in the energy storage state releases energy to drive the rotating shaft 30. The rotating shaft 30 can drive the friction wheel 25 to rotate. Then, the friction transmission between the friction wheel 25 and the friction ring 15 is used to assist the starting of the connecting shaft 3, thereby reducing the load on the main drive of the connecting shaft 3 and realizing energy saving.

[0027] Furthermore, when the connecting shaft 3 is gradually decelerating until it stops, the friction wheel 25 contacts the connecting shaft 3, and the friction transmission between the friction wheel 25 and the friction ring 15 drives the rotating shaft 30 to rotate. In turn, the rotating shaft 30 stores energy in the energy storage spring 31, thereby recovering the energy from the rotation of the connecting shaft 3 and further achieving the energy-saving effect.

[0028] The limiting component includes a movable block 33 disposed inside the third mounting groove 27. The movable block 33 is used to install the limiting block 35 and the spring 36, and drives the limiting block 35 to move up and down. A second electric push rod 32 is installed at the bottom of the third mounting groove 27. The second electric push rod 32 drives the movable block 33 to move up and down, controlling the engagement or disengagement of the limiting block 35 and the limiting groove 29. The telescopic end of the second electric push rod 32 is fixed to the bottom of the movable block 33. The upper end of the movable block 33 is provided with a movable groove 34. The movable groove 34 is provided with a limiting block 35 and a spring 36. The limiting block 35 is used to engage with the limiting groove 29 to achieve unidirectional limiting. The spring 36 is used to provide a reset elastic force for the limiting block 35. One end of the spring 36 is fixed to the bottom of the limiting block 35, and the other end of the spring 36 is fixed to the bottom of the movable groove 34.

[0029] The limiting block 35 has a rectangular parallelepiped structure. The end of the limiting block 35 away from the spring 36 has a bevel. The bevel design makes it easy for the limiting block 35 to smoothly engage with the limiting groove 29 when the friction wheel 25 rotates, while ensuring the one-way limiting function. By using the limiting block 35 to engage with the limiting groove 29, the friction wheel 25 can be limited in one direction, thereby enabling the rotating shaft 30 to rotate and store energy for the energy storage spring 31. When the limiting block 35 moves out of the limiting groove 29, the restriction on the friction wheel 25 can be released, allowing the energy storage spring 31 to release energy and drive the rotating shaft 30 to rotate.

[0030] The energy management unit 5 includes a rectifier circuit, an energy storage module (such as a supercapacitor), and a bidirectional inverter / drive circuit. The rectifier circuit is used to rectify the recovered electrical energy input, the energy storage module (such as a supercapacitor) is used to store electrical energy, and the bidirectional inverter / drive circuit is used to output electrical energy. The rectifier circuit rectifies the electrical energy generated by the piezoelectric ceramic fiber 18, the energy storage module stores the rectified electrical energy, and the bidirectional inverter / drive circuit converts the stored electrical energy into electrical energy that is compatible with the high-frequency alternating magnetic field generating ring and the auxiliary drive mechanism and outputs it. The input end of the energy management unit 5 is connected to the multi-stage piezoelectric fiber composite material ring through the first connecting line 4, and the output end of the energy management unit 5 is connected to the high-frequency alternating magnetic field generating ring and the auxiliary drive mechanism through the second connecting line 7 and the third connecting line 8, respectively. The energy management unit 5 provides excitation current to the micro-coil array 2 of the high-frequency alternating magnetic field generating ring through the second connecting line 7, and provides energy to the auxiliary drive motor 26 through the third connecting line 8.

[0031] When the high-efficiency energy-saving transmission device of the present invention is used, the existing main drive machine drives the connecting shaft 3 to rotate through the flexible coupling 14. The connecting shaft 3 is connected to the existing sand mill rotor, transmitting the irregular broadband mechanical vibration generated by the sand mill under the grinding load to the inner ring 21 of the magnetostrictive bushing fixed to the connecting shaft 3. The inner ring 21 transmits the vibration stress to the magnetostrictive material 20. Due to the inverse magnetostrictive effect, the magnetization intensity inside the magnetostrictive material 20 undergoes synchronous high-frequency fluctuations, thereby forming a fluctuating magnetic field around the magnetostrictive bushing. This fluctuating magnetic field cuts the piezoelectric ceramic fibers in the multi-level piezoelectric fiber composite material ring arranged coaxially on the outside. 18. The piezoelectric ceramic fiber 18 generates an alternating electromotive force, and the generated electrical energy is input to the energy management unit 5 through the first connecting line 4. The rectifier circuit inside the energy management unit 5 rectifies the electrical energy and stores it in the energy storage module. The electrical energy in the energy storage module is output to the micro-coil array 2 of the high-frequency alternating magnetic field generating ring through the second connecting line 7, driving the micro-coil array 2 to generate a controlled high-frequency alternating magnetic field. This magnetic field interacts with the fluctuating magnetic field of the magnetostrictive material 20, enhancing the deformation of the magnetostrictive material 20 at a specific phase to provide active electromagnetic damping, avoiding excessive vibration of the connecting shaft 3 and the mill rotor, and playing a protective role.

[0032] On the other hand, when the connecting shaft 3 is started, the energy management unit 5 supplies power to the auxiliary drive motor 26 through the third connecting line 8, and at the same time controls the first electric push rod 22 to extend and push the movable seat 12 to rise, so that the friction wheel 25 on the mounting bracket 13 presses against the friction ring 15 on the connecting shaft 3. The auxiliary drive motor 26 drives the rotating shaft 30 and the friction wheel 25 to rotate. At the same time, the energy management unit 5 controls the second electric push rod 32 to retract, driving the moving block 33 and the limiting block 35 to move down, so that the inclined end of the limiting block 35 disengages from the limiting groove 29 on the friction wheel 25, releasing the one-way limiting of the rotating shaft 30. At this time, the elastic energy stored in the energy storage spring 31 is released, driving the rotating shaft 30 to rotate faster. The rotating shaft 30 drives the friction wheel 25 to assist in driving the connecting shaft 3 through friction transmission.

[0033] When the connecting shaft 3 is in the deceleration and braking stage, the second electric push rod 32 is extended to push the moving block 33 and the limiting block 35 upward. Under the action of the spring 36, the limiting block 35 is engaged in the limiting groove 29 of the friction wheel 25 to achieve unidirectional limiting. At this time, the connecting shaft 3 drives the friction wheel 25 and the rotating shaft 30 to rotate through the friction ring 15. The rotation of the rotating shaft 30 tightens the energy storage spring 31 to store energy, recovering and storing the kinetic energy of the connecting shaft 3 as mechanical energy. During the whole process, if it is necessary to adjust the transmission direction of the friction wheel 25, the energy management unit 5 can control the reversing motor 28 to work and drive the mounting bracket 13 to rotate in the second mounting groove 23 of the movable seat 12, thereby adjusting the angle of the friction wheel 25 relative to the friction ring 15.

[0034] See Figure 8A nano-sand mill, including a high-efficiency and energy-saving transmission device.

[0035] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency and energy-saving transmission device, characterized in that, include: A high-frequency alternating magnetic field generating ring, which is composed of a device shell (1) and a micro-coil array (2) uniformly installed on the inner wall of the device shell (1); A multi-level piezoelectric fiber composite ring is disposed inside the high-frequency alternating magnetic field generating ring. The multi-level piezoelectric fiber composite ring is composed of a flexible epoxy body (17) and piezoelectric ceramic fibers (18) embedded in the flexible epoxy body (17) arranged in an array along the circumferential and axial directions. The flexible epoxy body (17) is connected to the device shell (1) through a connecting plate (16). A magnetostrictive bushing is disposed on the inner side of the multi-level piezoelectric fiber composite material ring. The magnetostrictive bushing is composed of an outer ring (19), an inner ring (21), and a magnetostrictive material (20) uniformly embedded between the outer ring (19) and the inner ring (21). The connecting shaft (3) is fixed to the inner side of the inner ring (21); An auxiliary drive mechanism is located below the connecting shaft (3); The energy management unit (5) has its input end connected to the multi-level piezoelectric fiber composite material ring via a first connecting line (4), and its output end connected to the high-frequency alternating magnetic field generating ring and the auxiliary drive mechanism via a second connecting line (7) and a third connecting line (8), respectively.

2. The high-efficiency energy-saving transmission device according to claim 1, characterized in that, The auxiliary drive mechanism includes a fixed base (10), the upper end of the fixed base (10) is provided with a first mounting groove (11), the interior of the first mounting groove (11) is provided with a movable base (12), the inner bottom of the first mounting groove (11) is provided with a first electric push rod (22), the telescopic end of the first electric push rod (22) is fixed to the bottom of the movable base (12), the upper end of the movable base (12) is provided with a second mounting groove (23), the interior of the second mounting groove (23) is provided with a mounting frame (13), the inner bottom of the second mounting groove (23) is provided with a commutator motor (28), the output shaft of the commutator motor (28) is fixed to the bottom of the mounting frame (13), and the mounting frame (13) is provided with a drive structure.

3. The high-efficiency energy-saving transmission device according to claim 2, characterized in that, The bottom of the device housing (1) is fixed with a support column (6), and two fixing plates (9) are fixed on the side wall of the fixing seat (10). The fixing plates (9) are fixed on the side wall of the support column (6).

4. The high-efficiency energy-saving transmission device according to claim 2, characterized in that, The drive structure includes a rotating shaft (30) that passes through a mounting bracket (13) and is rotatably connected to it. An auxiliary drive motor (26) is mounted on one side wall of the mounting bracket (13). The output shaft of the auxiliary drive motor (26) is fixedly connected to the end of the rotating shaft (30). The auxiliary drive motor (26) is connected to a third connecting line (8). An energy storage spring (31) is fixed to the end of the rotating shaft (30) away from the auxiliary drive motor (26). The end of the spring (31) away from the shaft (30) is fixed to the side wall of the mounting bracket (13). A friction wheel (25) is fixedly sleeved on the shaft (30). Limiting grooves (29) are evenly distributed circumferentially on the side wall of the friction wheel (25). A third mounting groove (27) is provided on the mounting bracket (13). A limiting member that cooperates with the limiting groove (29) is provided inside the third mounting groove (27). A friction ring (15) that cooperates with the friction wheel (25) is fixedly sleeved on the connecting shaft (3).

5. The high-efficiency energy-saving transmission device according to claim 4, characterized in that, The limiting component includes a movable block (33) disposed inside the third mounting groove (27). A second electric push rod (32) is installed at the bottom of the third mounting groove (27). The telescopic end of the second electric push rod (32) is fixed to the bottom of the movable block (33). The upper end of the movable block (33) is provided with a movable groove (34). The movable groove (34) is provided with a limiting block (35) and a spring (36). One end of the spring (36) is fixed to the bottom of the limiting block (35), and the other end of the spring (36) is fixed to the bottom of the movable groove (34).

6. The high-efficiency energy-saving transmission device according to claim 4, characterized in that, A protective cover (24) is fixed on the side wall of the mounting bracket (13) and placed on the outside of the energy storage spring (31).

7. The high-efficiency energy-saving transmission device according to claim 5, characterized in that, The limiting block (35) is a cuboid structure, and the end of the limiting block (35) away from the spring (36) has an inclined surface.

8. The high-efficiency energy-saving transmission device according to claim 1, characterized in that, A flexible coupling (14) is installed at one end of the connecting shaft (3).

9. A nano-sand mill, characterized in that, Includes the high-efficiency energy-saving transmission device as described in any one of claims 1-8.

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