Ball mill motor soft start device and method based on volute spiral spring energy storage

Abstract

The invention discloses a ball mill motor soft start device and method based on volute spiral spring energy storage. The ball mill motor soft start device comprises a ball mill, a transmission device, a working motor, a transmission device, a T-shaped different-direction transmission distribution device, a volute spiral spring and an auxiliary motor device. The working motor and the transmission device maintain stable work of the ball mill, after the ball mill is shut down, transmission is conducted through the T-shaped different-direction transmission distribution device, energy is stored and recycled through the volute spiral spring and the auxiliary motor device, and the initial rotating speed is provided for the ball mill in the next time of starting, and when the volute spiral spring does not store energy, the auxiliary motor charges the volute spiral spring; soft start is realized; according to the invention, the defect that the existing ball mill soft starting device only improves a motor starting circuit basically is effectively overcome, adverse harmonic waves are prevented from being generated through mechanical soft starting, and the shutdown energy of the ball mill is effectively recycled.

Description

Technical Field

[0001] The present invention belongs to the technical field of soft starting devices, and in particular relates to a soft starting device and method for a ball mill motor based on vortex spring energy storage. Background Art

[0002] With growing global attention to energy conservation, emission reduction, and carbon neutrality goals, the demand for efficient energy utilization in the industrial sector continues to rise. Ball mills, as core equipment, are particularly challenging in industries such as mining, chemical, and cement. Energy consumption and current surges during startup have become increasingly challenging technical challenges. Ball mills are typically driven by electric motors. Traditional direct starting methods, such as the instantaneous current surge (Is / In ≈ 6–7), not only cause grid fluctuations but also increase wear on the motor and other drive systems, leading to increased equipment failure rates. While electrical soft-start technologies (such as star-delta starting and inverter soft-start) mitigate this current surge to some extent, they still cannot fundamentally address the issues of low energy efficiency and high maintenance costs, nor can they effectively recover and utilize residual kinetic energy after shutdown. Traditional mechanical soft-start technologies (including hydraulic couplings and variable-speed gearboxes) also suffer from low efficiency, limited fluid life, and the need for regular maintenance. While these mechanical methods can achieve a certain degree of startup smoothness, their potential for energy recovery and efficient utilization remains underutilized.

[0003] The existing ball mill soft start device has certain drawbacks in its design. The existing soft start device basically focuses on improving the starting circuit of the motor, and the harmonics generated have adverse effects on the motor and the power grid. See Cai Zuguang. Discussion on the starting method of the ball mill in the clay sintered colored tile production enterprise [J]. Brick and Tile World, 2016, (02): 52-55+45; the existing ball mill soft start device lacks the use of mechanical soft start method.

[0004] In order to solve the above problems, a Chinese patent (CN214591218U) discloses a soft start device for a ball mill, which facilitates the installation and disassembly of the soft start device and effectively protects the terminal wiring, but does not improve the soft start device. For this reason, it is necessary to propose a new mechanical soft start technology. This technology stores the residual kinetic energy after shutdown in a volute spring, and releases this stored kinetic energy at the next startup to assist the startup process, greatly reducing the startup process's dependence on the power grid system, while reducing energy consumption and current shocks when the motor starts. In addition, it is also necessary to provide a way to store energy in the spring through a small reduction motor to further improve energy efficiency and system stability. This technology can not only significantly reduce the energy consumption of the ball mill and reduce the burden on the power system, but also has good environmental adaptability and low maintenance costs. It is an innovative solution that meets the requirements of energy conservation and emission reduction. Summary of the Invention

[0005] The present invention provides a ball mill motor soft starting device and method based on scroll spring energy storage, which can store the kinetic energy of the drum after the ball mill stops through the scroll spring and use it to assist the next start-up. When the stored energy is insufficient, the scroll spring can also be used to store energy and assist in starting through a high-speed worm reduction motor, thereby solving the problem that the existing ball mill soft starting device lacks the use of a mechanical soft starting method with recoverable energy.

[0006] To solve the above problems, the present invention provides the following technical solutions:

[0007] The embodiment of the present invention provides a vortex spring energy storage ball mill motor soft starting device, comprising a ball mill and a transmission device, a working motor and a transmission device, a T-type anisotropic transmission distribution device, a vortex spring and an auxiliary motor device; the working motor and the transmission device are used to maintain the stable operation of the ball mill; when the ball mill is stopped, the vortex spring and the auxiliary motor device are used to store and recover energy through the T-type anisotropic transmission distribution device, and provide an initial speed for the ball mill when it is started next time; when the vortex spring (19) of the vortex spring and the auxiliary motor device does not store energy, the auxiliary motor (23) of the vortex spring and the auxiliary motor device charges the vortex spring (19), thereby realizing the soft motor starting of the ball mill and avoiding the impact on the power grid and the damage to the ball mill motor.

[0008] In an optional embodiment of the present invention, the ball mill and the transmission device include a feed port (1), a ball mill cylinder (2), a gear transmission housing (4) and a magnetic encoder (9), wherein the ball mill is arranged in the ball mill cylinder (2), the feed port (1) is arranged at the end of the ball mill, a transmission gear is arranged inside the gear transmission housing (4), the ball mill is connected to the transmission gear, and the magnetic encoder (9) is arranged on the gear transmission housing (4); wherein the mineral to be ground enters the ball mill through the feed port (1) for grinding, and energy is recovered through the internal transmission gear after shutdown.

[0009] In an optional embodiment of the present invention, the working motor and transmission device include a working motor (5), a first coupling (6), a dynamic torque detector (7) and a first electromagnetic clutch (8); the working motor (5) is connected to the dynamic torque detector (7) through the first coupling (6) and the first transmission shaft, the dynamic torque detector (7) is connected to the first electromagnetic clutch (8) through the second transmission shaft, the first electromagnetic clutch (8) is connected to the internal transmission gear of the ball mill and the transmission device through one end of the third transmission shaft (3), and the transmission gear is connected to the ball mill, so that the working motor (5) provides energy for the stable operation of the ball mill.

[0010] According to an optional embodiment of the present invention, the T-type differential transmission distribution device includes a second coupling (10), a transmission frame (12), a second electromagnetic clutch (13), a pulley (14) and a third electromagnetic clutch (27), wherein the second coupling (10) is connected to the ball mill through the other end of the third transmission shaft (3), the transmission frame (12) contains three spiral bevel gears (11) to form a T-type transmission device, the second electromagnetic clutch (13) and the third electromagnetic clutch (27) are controlled by an electronic control system, and the transmission of shutdown energy is achieved through a set program; the second electromagnetic clutch (13) and the third electromagnetic clutch (27) are located on both sides of the transmission frame (12), and the pulley (14) is on the outside of the second electromagnetic clutch (13).

[0011] According to an optional embodiment of the present invention, the scroll spring and auxiliary motor device comprises a transmission wheel (15), a speed change device (17), a scroll spring (19), a bolt (18), a static torque detector (20), a slide (22), an auxiliary motor (23) and a brake pad (25); the right side of the scroll spring (19) is connected to the speed change device (17), the end of the speed change device (17) is connected to the control device (16), the scroll spring (19) is circumferentially connected to a plurality of bolts (18), the left side of the scroll spring (19) is connected to the belt (26) and the brake pad (25), and the static torque detector (20) is fixed on the mounting bracket of the scroll spring (19); the belt (26) is connected to the pulley (14), thereby realizing connection with the T-type non-directional transmission distribution device through the belt (26); the slide (22) is arranged above the auxiliary motor (23);

[0012] The shutdown energy is stored in the volute spring (19) by the speed change device (17) through the belt (26), and is braked by the brake pad (25). The brake pad (25) is connected to the auxiliary motor (23). When there is no energy stored in the volute spring (19), the auxiliary motor (23) first stores energy for the volute spring (19) and finally transmits it to the ball mill.

[0013] An embodiment of the present invention provides a ball mill motor soft starting method based on scroll spring energy storage, comprising the following steps:

[0014] Step 1, detecting whether the spiral spring (19) has sufficient energy storage, if it has sufficient energy storage, starting from step 3; if it has insufficient energy storage or no energy storage, starting from step 2;

[0015] Step 2: The first electromagnetic clutch (8), the second electromagnetic clutch (13) and the third electromagnetic clutch (27) are not linked, the slide (22) moves forward, the worm of the auxiliary motor (23) engages with the third transmission shaft (3), the volute spring (19) is energized, and the brake is applied through the mechanical structure of the worm;

[0016] Step 3: The first electromagnetic clutch (8) and the second electromagnetic clutch (13) are not connected, and the third electromagnetic clutch (27) is connected. The slide (22) where the auxiliary motor (23) is located moves backward, disconnecting the meshing, and the spiral spring (19) releases energy, so that the ball mill obtains the initial speed;

[0017] Step 4: The second electromagnetic clutch (13) and the third electromagnetic clutch (27) are not operated in conjunction, the first electromagnetic clutch (8) is operated in conjunction, and the working motor (5) is started, so that the ball mill reaches the operating speed and keeps working;

[0018] In step 5, the ball mill is shut down, the first electromagnetic clutch (8) and the third electromagnetic clutch (27) are not connected, the second electromagnetic clutch (13) is connected, the volute spring (19) recovers energy, and after the static torque detection device (20) detects that the torque is a preset value, braking is performed, and the slide (22) moves forward, and the worm of the auxiliary motor (23) is engaged and locked with the third transmission shaft (3), completing energy recovery and storage.

[0019] Compared with the prior art, the embodiments of the present invention provide a ball mill motor soft starting device and method based on scroll spring energy storage, which has the following beneficial effects: the present invention recovers the energy after the ball mill is shut down through the scroll spring, and uses the stored energy to enable the ball mill to obtain an initial speed at the next startup, and finally connects the working motor to realize the soft starting of the ball mill, which can effectively recover and utilize the inertial energy after the ball mill is shut down, and realize mechanical soft starting, thereby avoiding impact on the power grid and damage to the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of a ball mill motor soft starting device based on scroll spring energy storage provided in an embodiment of the present application.

[0022] Figure 2 This is a schematic structural diagram of the ball mill, transmission device, and scroll spring device provided in an embodiment of the present application.

[0023] Figure 3This is a schematic structural diagram of the ball mill and working motor provided in an embodiment of the present application.

[0024] Figure 4 A schematic structural diagram of the transmission device and the scroll spring device provided in an embodiment of the present application.

[0025] Figure numerals: feed port 1, working motor 5, volute spring 19, auxiliary motor 24, ball mill 2, transmission shaft 3, gear transmission housing 4, coupling 6, dynamic torque detector 7, first electromagnetic clutch 8, magnetic braid 9, coupling 10, spiral bevel gear 11, transmission frame 12, second electromagnetic clutch 13, pulley 14, transmission wheel 15, electronic control system 16, speed change device 17, bolt 18, static torque detector 20, auxiliary motor part 21, slide 22, auxiliary motor 23, worm 24, brake pad 25, belt 26, third electromagnetic clutch 27. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application. The "upper", "lower", "front", "rear", "left", "right", etc. used in the installation position or direction of the structure or parts of this embodiment are based on the orientation of the given drawings. They are only for the convenience of expression to distinguish the relative positions of the various parts or directions, and do not represent the orientation of the device or functional parts of this embodiment when in use.

[0027] like Figure 1-Figure 4 As shown, an embodiment of the present invention provides a soft starting device for a ball mill motor with a vortex spring energy storage, comprising a ball mill and a transmission device, a working motor and a transmission device, a T-type asymmetric transmission distribution device, a vortex spring and an auxiliary motor device; the working motor and the transmission device are used to maintain the stable operation of the ball mill. When the ball mill is shut down, it is transmitted through the T-type asymmetric transmission distribution device, and the vortex spring and the auxiliary motor device store and recover energy to provide an initial speed for the ball mill at the next startup. When the vortex spring 19 of the vortex spring and the auxiliary motor device does not store energy, the vortex spring 19 is charged by the auxiliary motor 23 of the vortex spring and the auxiliary motor device to realize the soft motor starting of the ball mill, thereby avoiding impact on the power grid and damage to the ball mill motor.

[0028] Specifically, the ball mill and transmission device include a feed port 1, a ball mill cylinder 2, a gear transmission housing 4, and a magnetic spool 9. The ball mill is housed within the ball mill cylinder 2, the feed port 1 is located at the end of the ball mill, and a transmission gear is located within the gear transmission housing 4. The ball mill and the transmission gear are connected, and the magnetic spool 9 is located on the gear transmission housing 4. The mineral to be ground enters the ball mill through the feed port 1 for grinding, and after shutdown, energy is recovered through the internal transmission gear.

[0029] The working motor and transmission device includes a working motor 5, a first coupling 6, a dynamic torque detector 7, and a first electromagnetic clutch 8. The working motor 5 is connected to the dynamic torque detector 7 via the first coupling 6 and the first transmission shaft. The dynamic torque detector 7 is connected to the first electromagnetic clutch 8 via the second transmission shaft. The first electromagnetic clutch 8 is connected to the internal transmission gear of the ball mill and the transmission device via one end of the third transmission shaft 3. This transmission gear is connected to the ball mill. In this way, the working motor 5 provides energy for the stable operation of the ball mill. The working motor 5 of this embodiment transmits power through the coupling 6 and is connected to the first electromagnetic clutch 8 through the dynamic torque detector 7. The working motor provides energy for the stable operation of the ball mill.

[0030] The T-type counter-rotating transmission distribution device includes a second coupling 10, a transmission frame 12, a second electromagnetic clutch 13, a pulley 14, and a third electromagnetic clutch 27. The second coupling 10 is connected to the ball mill via the other end of the third transmission shaft 3. The transmission frame 12 contains three spiral bevel gears 11, forming a T-type transmission. The second and third electromagnetic clutches 13 and 27 are controlled by an electronic control system, and a programmed system is used to transmit shutdown energy. The second and third electromagnetic clutches 13 and 27 are located on either side of the transmission frame 12, with the pulley 14 outside the second electromagnetic clutch 13. The transmission frame 12 is mounted on the base of the ball mill motor soft starter.

[0031] The scroll spring and auxiliary motor assembly includes a transmission wheel 15, a speed changer 17, a scroll spring 19, bolts 18, a static torque detector 20, a slide 22, an auxiliary motor 23, and a brake pad 25. The right side of the scroll spring 19 is connected to the speed changer 17, and the end of the speed changer 17 is connected to the control device 16. Multiple bolts 18 are connected to the circumference of the scroll spring 19. A belt 26 and a brake pad 25 are connected to the left side of the scroll spring 19. The static torque detector 20 is fixed to the mounting bracket of the scroll spring 19 and is connected to the transmission disc. The belt 26 is connected to the pulley 14, thereby connecting the belt 26 to the T-type asymmetric transmission distribution device. An auxiliary motor portion 21 and a slide 22 are provided above the auxiliary motor 23.

[0032] Among them, the shutdown energy is stored in the spiral spring 19 through the speed change device 17 and the transmission disk through the belt 26, and braked by the brake pad 25. The brake pad 25 is connected to the auxiliary motor 23. When there is no energy stored in the spiral spring 19, the auxiliary motor 23 first stores energy for the spiral spring 19 and finally transmits it to the ball mill.

[0033] An embodiment of the present invention provides a ball mill motor soft starting method based on scroll spring energy storage, comprising the following steps:

[0034] Step 1: Check whether the spiral spring 19 is fully charged. If it is, proceed to step S3; if it is not, proceed to step S2.

[0035] Step 2: The first electromagnetic clutch 8, the second electromagnetic clutch 13, and the third electromagnetic clutch 27 are not in motion, the slide 22 moves forward, the worm of the auxiliary motor 23 engages with the third transmission shaft 3, energizes the volute spring 19, and brakes the vehicle through the mechanical structure of the worm.

[0036] Step 3: The first electromagnetic clutch 8 and the second electromagnetic clutch 13 are not connected, and the third electromagnetic clutch 27 is connected. The slide 22 where the auxiliary motor 23 is located moves backward and disengages. The spiral spring 19 releases energy, allowing the ball mill to obtain an initial speed.

[0037] Step 4: The second electromagnetic clutch 13 and the third electromagnetic clutch 27 are not operated in conjunction, the first electromagnetic clutch 8 is operated in conjunction, and the working motor 5 is started to make the ball mill reach the operating speed and keep working;

[0038] In step 5, the ball mill is shut down, the first electromagnetic clutch 8 and the third electromagnetic clutch 27 are not connected, the second electromagnetic clutch 13 is connected, and the volute spring 19 recovers energy. After the static torque detection device 20 detects that the torque is a preset value, braking is performed, and the slide 22 moves forward. The worm of the auxiliary motor 23 engages and locks with the third transmission shaft 3 to complete energy recovery and storage.

[0039] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A ball mill motor soft starter with a scroll spring energy storage device, characterized in that: The invention comprises a ball mill and a transmission device, a working motor and a transmission device, a T-type anisotropic transmission distribution device, a scroll spring and an auxiliary motor device; the working motor and the transmission device are used to maintain the stable operation of the ball mill; when the ball mill stops, the ball mill is driven by the T-type anisotropic transmission distribution device; the scroll spring and the auxiliary motor device store and recover energy, and provide an initial speed for the ball mill when it is started next time; when the scroll spring (19) of the scroll spring and the auxiliary motor device does not store energy, the scroll spring (19) is charged by the auxiliary motor (23) of the scroll spring and the auxiliary motor device, so as to realize the soft motor start of the ball mill and avoid the impact on the power grid and the damage to the ball mill motor.

2. The volute spring energy storage ball mill motor soft start device according to claim 1, characterized in that: The ball mill and transmission device comprise a feed port (1), a ball mill cylinder (2), a gear transmission housing (4) and a magnetic encoder (9); the ball mill is arranged in the ball mill cylinder (2); the feed port (1) is arranged at the end of the ball mill; a transmission gear is arranged inside the gear transmission housing (4); the ball mill is connected to the transmission gear; and the magnetic encoder (9) is arranged on the gear transmission housing (4); wherein the mineral to be ground enters the ball mill through the feed port (1) for grinding, and energy is recovered through the internal transmission gear after the mill is stopped.

3. The volute spring energy storage ball mill motor soft start device according to claim 2, characterized in that: The working motor and transmission device include a working motor (5), a first coupling (6), a dynamic torque detector (7) and a first electromagnetic clutch (8); the working motor (5) is connected to the dynamic torque detector (7) through the first coupling (6) and the first transmission shaft, the dynamic torque detector (7) is connected to the first electromagnetic clutch (8) through the second transmission shaft, the first electromagnetic clutch (8) is connected to the internal transmission gear of the ball mill and the transmission device through one end of the third transmission shaft (3), and the transmission gear is connected to the ball mill, so that the working motor (5) provides energy for the stable operation of the ball mill.

4. The volute spring energy storage ball mill motor soft starter according to claim 3, characterized in that: The T-type differential transmission distribution device comprises a second coupling (10), a transmission frame (12), a second electromagnetic clutch (13), a pulley (14) and a third electromagnetic clutch (27), wherein the second coupling (10) is connected to the ball mill through the other end of the third transmission shaft (3), the transmission frame (12) contains three spiral bevel gears (11) to form a T-type transmission device, the second electromagnetic clutch (13) and the third electromagnetic clutch (27) are controlled by an electronic control system, and the transmission of shutdown energy is realized through a set program; the second electromagnetic clutch (13) and the third electromagnetic clutch (27) are located on both sides of the transmission frame (12), and the pulley (14) is on the outside of the second electromagnetic clutch (13).

5. The volute spring energy storage ball mill motor soft starter according to claim 4, characterized in that: The vortex spring and auxiliary motor device comprises a transmission wheel (15), a speed change device (17), a vortex spring (19), a bolt (18), a static torque detector (20), a slide (22), an auxiliary motor (23) and a brake pad (25); the right side of the vortex spring (19) is connected to the speed change device (17), the end of the speed change device (17) is connected to the control device (16), the vortex spring (19) is circumferentially connected to a plurality of bolts (18), the left side of the vortex spring (19) is connected to the belt (26) and the brake pad (25), and the static torque detector (20) is fixed on the mounting bracket of the vortex spring (19); the belt (26) is connected to the pulley (14), thereby realizing connection with the T-type non-directional transmission distribution device through the belt (26); the slide (22) is arranged above the auxiliary motor (23); The shutdown energy is stored in the volute spring (19) by the speed change device (17) through the belt (26), and is braked by the brake pad (25). The brake pad (25) is connected to the auxiliary motor (23). When there is no energy stored in the volute spring (19), the auxiliary motor (23) first stores energy for the volute spring (19) and finally transmits it to the ball mill.

6. A ball mill motor soft starting method based on scroll spring energy storage, characterized in that: The steps include: Step 1, detecting whether the spiral spring (19) has sufficient energy storage, if it has sufficient energy storage, starting from step 3; if it has insufficient energy storage or no energy storage, starting from step 2; Step 2: The first electromagnetic clutch (8), the second electromagnetic clutch (13) and the third electromagnetic clutch (27) are not linked, the slide (22) moves forward, the worm of the auxiliary motor (23) engages with the third transmission shaft (3), the volute spring (19) is energized, and the brake is applied through the mechanical structure of the worm; Step 3: The first electromagnetic clutch (8) and the second electromagnetic clutch (13) are not connected, and the third electromagnetic clutch (27) is connected. The slide (22) where the auxiliary motor (23) is located moves backward, disconnecting the meshing, and the spiral spring (19) releases energy, so that the ball mill obtains the initial speed; Step 4: The second electromagnetic clutch (13) and the third electromagnetic clutch (27) are not operated in conjunction, the first electromagnetic clutch (8) is operated in conjunction, and the working motor (5) is started, so that the ball mill reaches the operating speed and keeps working; In step 5, the ball mill is shut down, the first electromagnetic clutch (8) and the third electromagnetic clutch (27) are not connected, the second electromagnetic clutch (13) is connected, the volute spring (19) recovers energy, and after the static torque detection device (20) detects that the torque is a preset value, braking is performed, and the slide (22) moves forward, and the worm of the auxiliary motor (23) is engaged and locked with the third transmission shaft (3), completing energy recovery and storage.

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