Hoisting mechanism

FIELD: transport.

SUBSTANCE: invention relates to machine building and may be used in hoisting machines. Proposed mechanism comprises motor, flexible coupling with braking pulley, reduction gear, two-rim toothed coupling and drum. Reduction gear low-rpm shaft output end is coupled via elastic coupling with controlled planet gearing with central gear shaft coupled with the screw of mechanical power accumulator. Centrifugal brake is fitted on reduction gear high-rpm shaft.

EFFECT: higher efficiency.

1 dwg

 

The invention relates to mechanical engineering and can be used in the construction of load-lifting machines.

A known mechanism for lifting [1], containing an electric motor, flexible coupling with brake pulley, gear, dvuhventsovye coupling and drum.

The disadvantage of this mechanism is its low efficiency, because the potential energy, which has raised load, when lowering the load goes into heat and dissipated in the atmosphere. This mechanism is adopted as a prototype.

The purpose of the invention is improving the efficiency of the lifting mechanism of the cargo.

This objective is achieved in that the lifting mechanism of the cargo containing an electric motor, flexible coupling with brake pulley, gear, dvuhventsovye gear clutch and the drum, the output end of the low speed shaft of the gearbox via a flexible coupling is connected with a controllable planetary clutch, the shaft of the Central gear which is connected via a coupling with screw mechanical energy accumulator, and the high-speed shaft mounted centrifugal brake.

The drawing shows the mechanism of a lift.

The mechanism for lifting includes a motor 1, the flexible coupling 2 with brake pulley, gear 3, dvuhventsovye coupling 4 and the drum 5. The output end of the low speed shaft of the gearbox 3 is connected via elastic is the UDF with the shaft 6 led 7 planetary clutch. On the drive rod 7 adjustably mounted satellites 8 included in mesh with the Central gear 9 and a ring gear 10, mounted in the housing 11. The outer surface of the housing 11 is made in the form of a brake pulley. To stop the housing 11 has a brake 12. For the fixed connection of the Central gear 9 with the housing 11 applies a controlled clutch (multi-disc friction clutch) 13. The energy storage is made in the form of a cylindrical housing 14 within which is installed a transmission screw-nut, and the screw 15 through the clutch 16 is connected to the shaft of the Central gear 9 and the nut 17 is connected with the elastic element 18, which is also located in the housing 14 of the drive energy. To lock the drive energy is applied controlled brake 19 and the brake pulley mounted on the shaft of the screw 15. To limit the stroke of the nut in the housing 14 of the energy storage limit switches 20 and 21. To exclude the possibility of excessive speed lifting at start-up mechanism of the drive energy for the high-speed shaft of the gearbox 3 is a centrifugal brake 22.

The mechanism of lifting works as follows.

When lowering the load, the motor 1 is in the brake mode of descent. For charging the elastic element 18 off the brakes 12 and 19, includes a clutch 13, the(7, 8, 9, 10, 11 planetary clutch combine as one. The screw 15 rotates with angular velocity equal to the angular velocity of the output shaft of the gearbox 3. When this nut 17 begins to move relative to the housing 14, compressing the elastic element 18. The force of elasticity exerted by the elastic element 18 on the nut 17, by passing the screw-nut will create on the shaft of the screw 15, the moment of resistance, due to which the required braking torque, which must develop the motor 1, will be temporarily reduced, leading to lower power consumption from the mains. When the elastic element 18 is fully charged, the nut 17 presses the limit switch 20, and then starts the brake 19, and the clutch 13 is turned off; when the brake 12 remains off. Due to this, a further lowering of the load with the motor regardless of the energy accumulator. When the load drops to a predetermined height, the motor 1 is turned off, and the braking mechanism.

In that case, if the mass is lowered cargo insufficient charging of the elastic element 18, it is either not connect at all, or not fully charge.

When lifting two options.

Option 1. If the drive energy by lowering the cargo had accumulated enough energy, then this energy can be start and acceleration of the lifting mechanism, and electrodes the tel 1 is turned on after as the rotor is up to speed in steady zone mechanical characteristics of the motor. This will reduce the starting torque of the motor and, consequently, to reduce heating of the motor windings, to increase its service life, lower power consumption from the mains when lifting. For the start of acceleration of the lifting mechanism of the cargo from the energy storage enables the brake 12, disconnected the brake 19 and the clutch 13, the elastic element 18 begins to spring up and moves the nut 17, which leads to rotation of the screw 15. Through the planetary clutch, which when the brake 12 operates to reduce the speed and increase in torque, the rotation is transmitted to the output shaft of the gearbox 3, which rotate idle all the other shafts of the reduction gear 3 and the rotor of the motor 1. In this case the centrifugal brake 22 eliminates the possibility of exceeding the set speed lifting. When the speed of the rotor of the motor 1 reaches the set value, the brake 12 is turned off, turns on the brake 19 and the motor 1. Further lifting is done in normal mode due to the motor 1. When the load rises to a predetermined height, the motor 1 is switched off and the braking mechanism. To exclude the possibility of a breakdown of energy storage in the body 14 has end in the back panel 21. If the elastic element 18 is fully discharged, the nut 17 presses the limit switch 21, the brake 12 is turned off, turns on the brake 19 and the motor 1. When the load rises to a predetermined height, the motor 1 is turned off, and the braking mechanism.

Option 2. If the drive energy when lowering the load has accumulated a certain amount of energy, it is part of the rise time can work in conjunction with the motor 1. This will lead to a decrease in torque of the motor 1 and, consequently, to reduce power consumption from the mains when lifting. For this purpose at the start of the lifting mechanism at the same time, the motor 1 and the brake 12, disconnected the brake 19 and the clutch 13; elastic element 18 begins to spring up and through the nut 17 creates a torque on the shaft of the screw 15, which, through the planetary clutch, which when the brake 12 works to increase the torque transmitted to the output shaft of the gearbox 3 and reduces the load on the motor 1. When the elastic element 18 is fully discharged, the nut 17 presses the limit switch 21, the brake 12 is turned off, turns on the brake 19; then lifting is performed by the motor 1.

In that case, if the energy storage device is not charged, then lifting it not connect at all.

If you need to defuse panel the guy element 18 (e.g., for inspection or repair work), when the motor 7 is switched off, the brake 12 and 19 and the clutch 13.

Sources of information

1. Reference cranes: 2 so-2. Characteristics and structural scheme of the cranes. Crane mechanisms, their parts and components. Maintenance of cranes / Mpolekaka, Mel, Amy and others; Under the General Ed. Era. - M.: Mashinostroenie, 1988. - 559 S. - S-376.

The lifting mechanism of the cargo containing an electric motor, flexible coupling with brake pulley, gear, dvuhventsovye gear clutch and the drum, characterized in that the output end of the low speed shaft of the gearbox via a flexible coupling is connected with a controllable planetary clutch, the shaft of the Central gear which is connected via a coupling with screw mechanical energy accumulator, and the high-speed shaft mounted centrifugal brake.



 

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