WO2022099802A1

WO2022099802A1 - Rotary driving mechanism and construction device

Info

Publication number: WO2022099802A1
Application number: PCT/CN2020/132095
Authority: WO
Inventors: 周航; 董成杰; 曾子敬; 姚龙刚; 于鑫磊
Original assignee: 中铁工程机械研究设计院有限公司
Priority date: 2020-11-12
Filing date: 2020-11-27
Publication date: 2022-05-19

Abstract

A rotary driving mechanism and a construction device, relating to the technical field of rotary systems. The rotary driving mechanism comprises an electrical system and a mechanical transmission system. The electrical system comprises a main transformer (5), two rectification feedback units (6), a common direct current bus (7) and a frequency conversion-inverter (8) which are electrically connected in sequence. The mechanical transmission system comprises a motor (9). The frequency conversion-inverter (8) is connected to the motor (9). The arrangement of the two sets of rectification feedback units (6) improves the energy conversion efficiency, and reduces the energy loss. A stable power supply is provided for the motor (9) under a working condition, a braking force is converted into electric energy by the motor (9) under a rotary braking condition, energy recycling is achieved, and disturbance to a power grid is avoided during energy recycling; moreover, no inversion failure condition is generated, and a motor-generator state conversion mode is optimized; a common direct-current bus (7) loop voltage is constant and is not affected by power grid voltage fluctuation.

Description

A rotary drive mechanism and construction equipment

technical field

The invention relates to the technical field of slewing systems, in particular, to a slewing drive mechanism and construction equipment.

Background technique

Electric shovel is the main equipment for open-pit mining, mainly composed of operating mechanism, loading system and unloading system. The loading system mainly includes rotary platform and rotary drive system, lifting system, counterweight box, ventilation and dust removal, machine shed and electrical accessories, etc., and the working mechanism is installed on the slewing platform. The slewing system can realize 360° full rotation of the platform and the upper mounting parts, and the slewing system can realize reliable braking in emergency situations.

At present, in the slewing system, the electric shovel slewing drive electrical system mainly adopts the AC variable frequency speed regulation system. Since there is only one rectifier unit in the AC variable frequency speed regulation system, it does not have the function of rectification and feedback. Usually, a parallel braking unit is set in the circuit. And through the resistor of the braking unit, the electric energy generated by the motor during braking is consumed, resulting in high energy consumption, and there is also a heat dissipation problem by converting the electric energy into heat energy, which affects the stability of the electrical system.

SUMMARY OF THE INVENTION

The problem solved by the present invention is that the energy consumption of the rotary drive mechanism is relatively high.

In order to solve the above problems, the present invention provides a rotary drive mechanism, including an electrical system and a mechanical transmission system, the electrical system includes a main transformer, two rectification feedback units, a common DC bus and a frequency conversion-inverter that are electrically connected in sequence, The mechanical transmission system includes a motor, and the frequency conversion-inverter is connected to the motor; when the rotary drive mechanism is in an operating condition, the main transformer is used to provide alternating current, and the output end of the main transformer is connected to the motor. The two rectification and feedback units are connected, and the rectification and feedback units are used to convert alternating current into direct current. Converted into alternating current to drive the motor; when the slewing drive mechanism is in a slewing braking condition, the motor is used to provide alternating current, and the variable frequency-inverter is used to convert the alternating current into direct current, the direct current is suitable for passing through all the The common DC bus enters the two rectification and feedback units, and the rectification and feedback units are used to convert the DC power into the AC power and transmit it to the main transformer, and the main transformer is used to boost the AC power and transmit it to the power grid.

The slewing drive mechanism of the present invention improves energy conversion efficiency and reduces energy loss by providing two sets of rectification and feedback units; provides a stable power supply for the motor under working conditions; The power is converted into electric energy to realize energy recovery and utilization, and the energy recovery will not cause disturbance to the power grid; at the same time, no inverter failure occurs, and the motor-generator state conversion method is optimized; the common DC bus circuit voltage is constant and not affected by the grid voltage. volatility effects.

Optionally, the electrical system further includes a high-voltage current collector, a high-voltage load switch, an isolation switch and a main contactor connected in sequence, the main contactor is connected to the main transformer, and the high-voltage current collector is used to receive the The alternating current transmitted by the power grid is sequentially transmitted to the main transformer through the high-voltage load switch, the isolation switch and the main contactor.

The slewing drive mechanism of the present invention effectively improves the safety of the main transformer by setting the high-voltage current collector, the high-voltage load switch, the isolating switch and the main contactor as switching equipment for the high-voltage electricity to enter the main transformer.

Optionally, two of the rectification and feedback units are arranged in parallel. When the slewing drive mechanism is in an operating condition, the common DC bus is the DC output bus of the two rectification and feedback units. When in the swing braking condition, the common DC bus is the DC input bus of the two rectifier feedback units.

The rotary drive mechanism of the present invention improves energy conversion efficiency and effectively reduces energy loss by arranging two rectifier feedback units in parallel.

Optionally, the frequency conversion-inverter includes an inverter part, the inverter part includes a rectification state and an inverter state, and the inverter part is adapted to convert the alternating current provided by the motor in the rectification state The inversion part is adapted to convert the direct current provided by the common direct current bus into alternating current to drive the motor in the inverting state for direct current to be transmitted to the common direct current bus.

The slewing drive mechanism of the present invention performs AC-DC conversion through the inverter part of the frequency conversion-inverter, so as to realize the normal operation of the electrical system and the mechanical transmission system under working conditions and slewing braking conditions.

Optionally, the mechanical transmission system further includes a brake, a rotary reducer, a rotary platform, a roller group, a ring gear, a lower frame, a rotary shaft, a gear and a central connecting shaft, and the motor is respectively connected to the brake and the central connecting shaft. The rotary reducer is connected to the rotary platform, the rotary platform is connected to the ring gear through the roller group, the ring gear is installed on the lower frame, and the rotary shaft The upper end of the rotary reducer is connected with the rotary reducer, the gear is meshed with the ring gear, and the central connecting shaft is respectively connected with the rotary platform, the roller group, the ring gear and the lower frame.

The rotary drive mechanism of the present invention converts the braking force into electric energy by setting a mechanical transmission system, so as to realize the recovery and reuse of the braking energy.

Optionally, the motor includes an output shaft, the rotary reducer includes a parallel shaft pinion and a parallel shaft large gear, the output shaft is connected with the parallel shaft pinion, and the parallel shaft pinion is connected with the parallel shaft pinion. The shaft gear is engaged.

The rotary drive mechanism of the present invention realizes the power transmission of the motor by arranging that the output shaft of the motor is connected with the parallel shaft pinion, and the parallel shaft pinion meshes with the parallel shaft large gear.

Optionally, the rotary reducer further includes a planetary gear transmission, and the output end of the planetary gear transmission is keyed to the rotary shaft.

The rotary drive mechanism of the present invention realizes the transmission of torque by setting the output end of the planetary gear transmission to be keyed to the rotary shaft.

Optionally, the motor and the rotary reducer are connected by fasteners, and the power output end of the motor is keyed to the parallel shaft pinion.

In the rotary drive mechanism of the present invention, the motor and the rotary reducer are connected by fasteners, and the power output end of the motor is connected with the parallel shaft pinion key to realize the transmission of torque.

The present invention also provides a construction equipment comprising a plurality of the above-mentioned rotary drive mechanisms. The construction equipment and the above-mentioned rotary drive mechanism have the same advantages over the prior art, which will not be repeated here.

Optionally, any one of the rotary drive mechanisms includes a motor, and a plurality of the motors are mechanically coupled.

The construction equipment of the present invention improves the operation efficiency by setting the mechanical coupling between the motors.

Description of drawings

1 is a single-line schematic diagram of an electrical system and a motor according to an embodiment of the present invention;

2 is a schematic structural diagram of a mechanical transmission system according to an embodiment of the present invention;

3 is a schematic diagram of the specific structure of the mechanical transmission system according to the embodiment of the present invention;

4 is a schematic diagram of the transmission structure of the electric shovel rotating fully parallel shaft according to the embodiment of the present invention;

FIG. 5 is a schematic diagram of the transmission of the parallel axis of rotation of the electric shovel and the planetary reducer according to the embodiment of the present invention.

Description of reference numbers:

1- High voltage receiver; 2- High voltage load switch; 3- Isolation switch; 4- Main contactor; 5- Main transformer; 6- Rectifier feedback unit; 7- Common DC bus; 8- Frequency conversion- Inverter; 9- Motor, 901-output shaft; 10-brake; 11-slewing reducer, 1101-parallel shaft pinion, 1102-parallel shaft large gear, 1103-planetary gear transmission; 12-slewing platform; 13-roller group; 14-tooth Circle; 15-lower frame; 16-rotary shaft; 17-gear; 18-central connecting shaft; 19-parallel shaft reducer; 20-rotating vertical shaft; 21-high-speed parallel shaft reduction; 22-low-speed planetary stage slow down.

Detailed ways

Electric shovel rotary drive electrical system mainly has the following forms: generator-motor DC speed regulation system, thyristor DC voltage regulation speed regulation system, AC frequency conversion speed regulation system. Due to the advantages of advanced technology, high efficiency, energy saving and low failure rate, the AC variable frequency speed control system has gradually become the mainstream. At present, the mainstream AC frequency conversion speed regulation system mainly has the following two forms: rectifier unit + common DC bus frequency conversion speed regulation system; thyristor rectifier feedback unit + public DC bus frequency conversion speed regulation system. Ordinary rectification has better speed regulation performance and high reliability, but in the case of slewing braking, a separate braking unit needs to be designed, and the electric energy generated by braking is consumed by resistance heating, energy feedback cannot be realized, and energy consumption is high. The thyristor rectifier feedback unit has excellent speed regulation performance, which can realize braking energy feedback to the grid, with low energy consumption, but there will be inverter failure, which will interfere with the grid. Therefore, a separate inverter bridge circuit needs to be designed.

Combined with the transmission of the fully parallel shaft reducer shown in FIG. 4 , including the motor 9 , the parallel shaft reducer 19 and the rotating vertical shaft 20 , and the first-level parallel shaft + planetary reducer transmission shown in FIG. 5 , including the motor 9 and the rotating vertical shaft 20 , high-speed parallel shaft deceleration 21 and low-speed planetary deceleration 22, because the full parallel shaft reducer has the disadvantages of large size and low transmission efficiency, so the current mainstream transmission structure mostly adopts the parallel shaft + planetary reducer structure to reduce Installation space improves transmission efficiency. However, the first-level parallel shaft (high-speed stage) in the existing parallel shaft + planetary reducer structure is designed in the reducer case body, and the drive motor shaft and the reducer input shaft are splined to transmit torque. Since the high-speed stage is inside the reducer housing, the maintenance and replacement of the high-speed pinion can only be carried out by disassembling the upper cover of the entire reducer, and if the pinion is damaged or broken, the falling debris will affect the planetary-level transmission. There is a great risk of causing huge damage. In addition, at present, the outer ring gear of the planetary stage and the reducer casing are an integral structure, so during the rotating operation of the electric shovel, the torsional impact load on the reducer is transmitted to the reducer casing, and between the casings The connection and the connection part between the shell and the rotary platform will be greatly impacted, and the reliability of the connection will be reduced. Finally, due to the structural limitation of the reducer, when the output end of the planetary star is connected to the rotary vertical shaft, the planetary star of the reducer must be removed first, so that the rotary vertical shaft can be installed and fixed in place, and then the reducer can be assembled. Extremely complex and inefficient.

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , an embodiment of the present invention provides a rotary drive mechanism, including an electrical system and a mechanical transmission system. The electrical system includes a main transformer 5 , two rectifier feedback units 6 , a common DC bus 7 and Frequency conversion-inverter 8, the mechanical transmission system includes a motor 9, and the frequency conversion-inverter 8 is connected to the motor 9; when the slewing drive mechanism is in working condition, the main transformer 5 is used for Provide alternating current, the output end of the main transformer 5 is connected to the two rectification feedback units 6, the rectification feedback units 6 are used to convert the alternating current into direct current, and the direct current is suitable for entering the frequency conversion through the common DC bus 7 -Inverter 8, which is used to convert DC power to AC power to drive the motor 9; when the swing drive mechanism is in a swing braking condition, the motor 9 is used to provide AC power , the frequency conversion-inverter 8 is used to convert the alternating current into direct current, and the direct current is suitable for entering the two rectification and feedback units 6 through the common DC bus 7, and the rectification and feedback units 6 are used to convert the direct current into alternating current. And transmitted to the main transformer 5, the main transformer 5 is used to boost the alternating current and transmit it to the grid.

Specifically, in this embodiment, the slewing drive mechanism includes an electrical system and a mechanical transmission system, wherein the electrical system includes a main transformer 5, two rectification feedback units 6, a common DC bus 7, and a frequency conversion-inverter that are electrically connected in sequence 8. The mechanical transmission system includes a motor 9 , and the frequency conversion-inverter 8 is connected to the motor 9 .

When the slewing drive mechanism is in the working condition, the main transformer 5 reduces the high-voltage 10kV alternating current to 690V alternating current, and the two output circuits of the main transformer 5 are respectively connected to the main and slave AFE (Active Front End, active front end, because it is located on the power inlet side, So called front-end) two rectification feedback units 6, the output after rectification is 690V DC, the DC enters the frequency conversion-inverter 8 through the common DC bus 7, and the 690V DC is converted into 690V AC through the inverter, and is provided to the motor. 9 use.

When the slewing drive mechanism is in the slewing braking condition, as shown in FIG. 2 , the motor 9 cooperates with the brake 10 and other components to convert the braking force into electrical energy, and the motor 9 changes to the state of generating electricity and outputs 690V alternating current. At this time, the inverter 8 In the rectification state, the 690V AC power is converted into DC power. After passing through the common DC bus 7, it can not only be used for lifting, pushing, and walking motors, but also directly into the rectification feedback unit 6. The two sets of rectification feedback units 6 can not only ensure the common DC The voltage of the bus bar 7 is stable, and the excess electric energy can also be inverted and boosted by the main transformer 5 and fed back to the power grid. There will be no inverter failure, no harmonic generation, no impact on the power grid, and high reliability. There is no need for a series braking resistor unit on the DC common bus.

In this embodiment, two sets of rectification and feedback units are provided, which improves the energy conversion efficiency and reduces energy loss; provides a stable power supply for the motor under working conditions, and converts the braking force into Electric energy can be recovered and utilized, and the energy recovery will not cause disturbance to the power grid; at the same time, no inverter failure will occur, and the motor-generator state conversion method is optimized; the public DC bus circuit voltage is constant and not affected by grid voltage fluctuations.

Optionally, the electrical system further includes a high-voltage current collector 1, a high-voltage load switch 2, an isolation switch 3 and a main contactor 4 connected in sequence, the main contactor 4 is connected to the main transformer 5, and the high-voltage receiver The electrical appliance 1 is used to receive the alternating current transmitted by the power grid, and sequentially transmit it to the main transformer 5 through the high-voltage load switch 2 , the isolation switch 3 and the main contactor 4 .

Specifically, in this embodiment, as shown in FIG. 1 , the electrical system further includes a high-voltage current collector 1 , a high-voltage load switch 2 , an isolation switch 3 and a main contactor 4 , and the 10kV high-voltage alternating current is input through the high-voltage current collector 1 . , after passing through the high-voltage load switch 2, isolating switch 3, and main contactor 4, it enters the main transformer 5. After the action of the main transformer 5, the voltage drops to 690V AC, and in the slewing braking condition, it can also pass through the rectification feedback unit. 6. The excess electric energy is inverted and fed back to the power grid after being boosted by the main transformer 5. There will be no inverter failure, no harmonic generation, no impact on the power grid, and high reliability.

In this embodiment, the safety of the main transformer is effectively improved by setting the high-voltage current collector, the high-voltage load switch, the isolation switch and the main contactor as the switchgear for the high-voltage electricity to enter the main transformer.

Optionally, two of the rectification and feedback units 6 are arranged in parallel. When the slewing drive mechanism is in an operating condition, the common DC bus 7 is the DC output bus of the two rectification and feedback units 6. When the slewing drive mechanism is in the slewing braking condition, the common DC bus 7 is the DC input bus of the two rectification feedback units 6 .

Specifically, in this embodiment, as shown in FIG. 1 , two rectification and feedback units 6 are arranged in parallel. When the rotary drive mechanism is in the working condition, the common DC bus 7 is the DC output bus of the two rectification and feedback units 6 , When the slewing drive mechanism is in the slewing braking condition, the common DC bus 7 is the DC input bus of the two rectification and feedback units 6 .

In this embodiment, by setting two rectifier feedback units in parallel, the energy conversion efficiency is improved, and the energy loss is effectively reduced.

Optionally, the frequency conversion-inverter 8 includes an inverter part, the inverter part includes a rectification state and an inverter state, and the inverter part is adapted to provide the motor 9 in the rectification state. The alternating current is converted into direct current and transmitted to the common direct current bus 7 , and the inverter part is adapted to convert the direct current provided by the common direct current bus 7 into alternating current to drive the motor 9 in the inverting state.

Specifically, in this embodiment, the frequency conversion-inverter 8 includes a frequency conversion part and an inverter part. The inverter acts as an AC controller and does not have the functions of inversion and rectification. The inverter part is suitable for converting the motor in the rectification state The alternating current provided by 9 is converted into direct current and transmitted to the common direct current bus 7 . The AC-DC conversion is performed by the inverter part of the frequency conversion-inverter 8, so as to realize the normal operation of the electrical system and the mechanical transmission system under working conditions and swing braking conditions.

In this embodiment, AC-DC conversion is performed by the inverter part of the frequency conversion-inverter, so as to realize the normal operation of the electrical system and the mechanical transmission system under working conditions and swing braking conditions.

Optionally, the mechanical transmission system further includes a brake 10, a rotary reducer 11, a rotary platform 12, a roller group 13, a ring gear 14, a lower frame 15, a rotary shaft 16, a gear 17 and a central connecting shaft 18. The The motor 9 is respectively connected with the brake 10 and the rotary reducer 11, the rotary reducer 11 is connected with the rotary platform 12, and the rotary platform 12 is connected with the ring gear 14 through the roller group 13, The ring gear 14 is mounted on the lower frame 15 , the upper end of the rotary shaft 16 is connected to the rotary reducer 11 , the gear 17 meshes with the ring gear 14 , and the central connecting shaft 18 is respectively It is connected with the rotary platform 12 , the roller group 13 , the ring gear 14 and the lower frame 15 .

Specifically, in this embodiment, as shown in FIG. 2 , the mechanical transmission system further includes a brake 10 , a rotary reducer 11 , a rotary platform 12 , a roller group 13 , a ring gear 14 , a lower frame 15 , a rotary shaft 16 , gears 17 and the central connecting shaft 18, the brake 10 is installed on the upper end of the rotary motor 9, the lower end of the rotary motor 9 is installed on the upper surface of the rotary reducer 11, the lower surface of the rotary reducer 11 is installed on the upper surface of the rotary platform 12, and the upper end of the rotary shaft 16 is connected to the rotary reducer. The machine 11 is connected, the rotary shaft 16 passes through the rotary platform 12, the other lower end of the rotary shaft 16 is exposed from the lower surface of the rotary platform 12, and is connected with the gear 17, the gear 17 meshes with the ring gear 14, and the rotary platform 12 is connected with the ring gear through the roller group 13. 14 is connected, and the ring gear 14 is mounted on the upper surface of the lower frame 15 . The slewing platform 12, the roller group 13, the ring gear 14, and the lower frame 15 are connected through the central connecting shaft 18, wherein the slewing platform 12 and the central connecting shaft 18 are connected by fasteners, and the central connecting shaft 18 and the lower frame 15 can be connected. relative rotation. The braking torque of the brake 10 is transmitted to the gear 17 through the motor 9, the rotary reducer 11, and the rotary shaft 16. Through the gear meshing, the braking torque decelerates the relative movement of the rotary platform 12 and the lower frame 15. The rotary platform 12 and its upper The other components installed as a whole decelerate relative to the slewing motion of the lower frame 15, thereby realizing braking, and during the slewing braking process, the slewing motor 9 is passively reversed to become a generator, and the braking force can be converted into kinetic energy through the reversal of the generator. Electric energy to realize the recovery and reuse of braking energy.

Among them, when the slewing drive mechanism is in the working condition, the motor 9 is driven by the electrical system to provide functions such as slewing, lifting, pushing and walking; and when the slewing drive mechanism is in the slewing braking condition, the motor 9 is converted into power generation The braking force is converted into electric energy through components such as the brake 10 to realize the recovery and reuse of the braking energy.

In this embodiment, by setting up a mechanical transmission system to convert the braking force into electrical energy, the recovery and reuse of the braking energy is realized.

Optionally, the motor 9 includes an output shaft 901, the rotary reducer 11 includes a parallel shaft pinion 1101 and a parallel shaft large gear 1102, the output shaft 901 is connected with the parallel shaft pinion 1101, and the parallel shaft The shaft pinion 1101 meshes with the parallel shaft bull gear 1102 .

Specifically, in this embodiment, as shown in FIG. 3 , the motor 9 includes an output shaft 901 , the rotary reducer 11 includes a parallel shaft pinion 1101 and a parallel shaft large gear 1102 , and the output shaft 901 is connected to the parallel shaft pinion 1101 , The parallel shaft pinion 1101 meshes with the parallel shaft bull gear 1102 . The casing of the motor 9 and the casing of the rotary reducer 11 are connected and fixed by fasteners, and the power output end of the motor 9 and the parallel shaft pinion 1101 of the rotary reducer 11 are connected to transmit driving torque through a key connection.

In this embodiment, the power transmission of the motor is realized by arranging that the output shaft of the motor is connected with the parallel shaft pinion, and the parallel shaft pinion meshes with the parallel shaft large gear.

Optionally, the rotary reducer 11 further includes a planetary gear transmission 1103 , and the output end of the planetary gear transmission 1103 is connected with the rotary shaft 16 by a key.

Specifically, in this embodiment, as shown in FIG. 3 , the rotary reducer 11 further includes a planetary gear transmission 1103 , and the output end of the planetary gear transmission 1103 is connected with the rotary shaft 16 by a key, such as a spline, and the rotary shaft 16 is connected with the rotary platform 12 is supported by bearings, the lower end of the rotary shaft 16 is connected with the gear 17 through the spline, and the gear 17 is limited by the shaft end baffle.

When the gear 17 of the rotary reducer 11 is maintained, the rotary motor 9 can be directly removed from the upper part to take out the gear 17 without dismantling the entire rotary reducer 11, and the maintenance is very convenient; the parallel shaft pinion 1101 is under the oil pool, even if the gear 17 has The falling of broken debris does not affect the mechanical structure of planetary-level deceleration, and the safety is high. The planetary stage is an independent structure, and the torque during the rotation of the electric shovel will not be transmitted to the outer casing of the rotary reducer 11, which ensures the safety and reliability of the connection between the outer casing and the platform. In addition, when installing or disassembling the rotary shaft 16, it is only necessary to remove the gear 17 and the lower end cover from the bottom of the rotary platform 12, and the rotary shaft 16 can be directly pulled out from below, and the rotary reducer 11 above the rotary platform 12 does not need to be disassembled. Therefore, installation and maintenance are extremely convenient.

In this embodiment, the transmission of torque is realized by setting the output end of the planetary gear transmission to be keyed to the rotary shaft.

Optionally, the motor 9 and the rotary reducer 11 are connected by fasteners, and the power output end of the motor 9 is keyed to the parallel shaft pinion 1101 .

Specifically, in this embodiment, as shown in FIG. 2 and FIG. 3 , the motor 9 and the rotary reducer 11 are connected by fasteners, and the power output end of the motor 9 is keyed to the parallel shaft pinion 1101 to realize torque transmission. . The first stage of the rotary reducer 11 is a parallel shaft gear transmission, and the second and third stages of the rotary reducer 11 are both planetary gear transmissions.

In this embodiment, the transmission of torque is realized by arranging that the motor and the rotary reducer are connected by fasteners, and the power output end of the motor is connected with the parallel shaft pinion key.

Optionally, the rotary reducer 11 is connected with the rotary platform 12 through a spigot and flange bolts.

Specifically, in this embodiment, the slewing reducer 11 and the slewing platform 12 are connected by spigots and flange bolts, thereby improving the connection strength and cooperation between the slewing reducer 11 and the slewing platform 12, which is beneficial to the working conditions and the The operating smoothness of the mechanical transmission system is improved under swing braking conditions.

In this embodiment, the connection between the slewing reducer and the slewing platform is provided through the spigot and flange bolts, thereby improving the connection strength and degree of cooperation between the slewing reducer and the slewing platform, which is beneficial to the working conditions and slewing braking conditions. The running smoothness of the lower mechanical transmission system is improved.

Another embodiment of the present invention provides a construction equipment, including a plurality of the above-mentioned rotary drive mechanisms. The construction equipment and the above-mentioned rotary drive mechanism have the same advantages over the prior art, which will not be repeated here.

Optionally, any one of the rotary drive mechanisms includes a motor 9, and a plurality of the motors 9 are mechanically coupled.

Specifically, in this embodiment, the mechanical transmission system of the plurality of rotary drive mechanisms includes a plurality of motors 9, and the motors 9 are mechanically coupled. The inverter 8 adopts torque master-slave control, with torque control as the main and speed control as the auxiliary, so as to improve the working efficiency. Among them, the mechanical coupling refers to a measure that two or more motors 9 depend on each other, which is usually represented by the degree of correlation of gear meshing transmission.

In this embodiment, by setting the mechanical coupling between the motors, the work efficiency is improved.

Although the disclosure of the present invention is as above, the protection scope of the disclosure of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

A rotary drive mechanism, characterized in that it includes an electrical system and a mechanical transmission system, wherein the electrical system includes a main transformer (5) electrically connected in sequence, two rectification feedback units (6), a common DC bus (7) and a frequency conversion - an inverter (8), said mechanical transmission system comprising a motor (9), said variable frequency-inverter (8) being connected to said motor (9);

When the slewing drive mechanism is in the working condition, the main transformer (5) is used to provide alternating current, and the output end of the main transformer (5) is connected to the two rectifier feedback units (6), the rectifier The feedback unit (6) is used to convert the alternating current into direct current, the direct current is adapted to enter the variable frequency-inverter (8) through the common direct current bus (7), and the variable frequency-inverter (8) is used to convert the Converting direct current to alternating current to drive the motor (9);

When the slewing drive mechanism is in a slewing braking condition, the motor (9) is used to provide alternating current, and the variable frequency-inverter (8) is used to convert the alternating current into direct current, which is suitable for passing through the common The DC bus (7) enters the two rectifier feedback units (6), the rectifier feedback units (6) are used to convert DC power into AC power and transmit it to the main transformer (5), the main transformer (5) Used to boost alternating current and transmit it to the grid.
The slewing drive mechanism according to claim 1, wherein the electrical system further comprises a high-voltage current collector (1), a high-voltage load switch (2), an isolation switch (3) and a main contactor (4) connected in sequence , the main contactor (4) is connected to the main transformer (5), and the high-voltage current collector (1) is used for receiving the alternating current transmitted by the power grid, and passes through the high-voltage load switch (2), the The isolating switch (3) and the main contactor (4) are transmitted to the main transformer (5).
The slewing drive mechanism according to claim 1, characterized in that, two rectification and feedback units (6) are arranged in parallel, and when the slewing drive mechanism is in an operating condition, the common DC bus (7) is two Each of the DC output buses of the rectification and feedback units (6), when the slewing drive mechanism is in a slewing braking condition, the common DC bus (7) is the DC input of the two rectification and feedback units (6). busbar.
The slewing drive mechanism according to claim 1, wherein the frequency conversion-inverter (8) includes an inverter part, the inverter part includes a rectification state and an inverter state, and the inverter part is adapted to In the rectification state, the alternating current provided by the motor (9) is converted into direct current and transmitted to the common direct current bus (7), and the inverter part is adapted to convert the common direct current in the inverting state The DC power provided by the busbar (7) is converted into AC power to drive the motor (9).
The rotary drive mechanism according to claim 1, wherein the mechanical transmission system further comprises a brake (10), a rotary reducer (11), a rotary platform (12), a roller group (13), a ring gear (14) ), a lower frame (15), a rotary shaft (16), a gear (17) and a central connecting shaft (18), the motor (9) is respectively connected with the brake (10) and the rotary reducer (11) The rotary reducer (11) is connected to the rotary platform (12), the rotary platform (12) is connected to the ring gear (14) through the roller group (13), and the ring gear ( 14) Installed on the lower frame (15), the upper end of the rotary shaft (16) is connected with the rotary reducer (11), the gear (17) is meshed with the ring gear (14), The central connecting shaft (18) is respectively connected with the rotary platform (12), the roller group (13), the ring gear (14) and the lower frame (15).
The rotary drive mechanism according to claim 5, wherein the motor (9) comprises an output shaft (901), and the rotary reducer (11) comprises a parallel shaft pinion (1101) and a parallel shaft large gear ( 1102), the output shaft (901) is connected with the parallel shaft pinion (1101), and the parallel shaft pinion (1101) meshes with the parallel shaft large gear (1102).
The rotary drive mechanism according to claim 6, wherein the rotary reducer (11) further comprises a planetary gear transmission (1103), the output end of the planetary gear transmission (1103) being connected to the rotary shaft (16). ) key to connect.
The slewing drive mechanism according to claim 6, wherein the motor (9) is connected with the slewing reducer (11) through fasteners, and the power output end of the motor (9) is parallel to the The shaft pinion (1101) is keyed.
A construction equipment is characterized by comprising a plurality of rotary drive mechanisms according to any one of claims 1 to 8.
The construction equipment according to claim 9, characterized in that, any one of the rotary drive mechanisms includes a motor (9), and a plurality of the motors (9) are mechanically coupled.