Summary of the invention
In order to solve above-mentioned existing in prior technology problem, task of the present invention provides a kind of differential compensating gantry crane, utilizes differential principle, by a cover differential compensating retarder, to reach desirable level luffing.
Technical scheme of the present invention is as follows:
A kind of differential compensating gantry crane, it comprises underframe and the bearing that is welded on machinery room bottom plate, be placed in the lifting motor on underframe and the bearing, the luffing motor, plate disc brake, toothed coupling, hoisting drum, amplitude-changing drum, assemblies such as drum shaft bearing, it also comprises the differential compensating retarder, one of them input shaft of differential compensating retarder is connected with lifting motor, another input shaft of differential compensating retarder is connected with the luffing motor, one of them output shaft of differential compensating retarder is connected with hoisting drum, and another output shaft of differential compensating retarder is connected with amplitude-changing drum; Described differential compensating retarder comprises first order differential planetary retarder and the second stage planetary reduction gear that hoists that hoists, and first order luffing gearing speed-reducer and second stage luffing planetary reduction gear, luffing motor-driven amplitude-changing drum rotates when luffing is worked, hoisting drum rotates with corresponding speed, goods amount of being raised or slippage realize the crane amplitude variation parallel motion by differential compensation when emitting or regaining a certain amount of hoist rope compensation owing to amount of decrease or amplification.
The present invention will hoist, luffing two cover mechanisms unite two into one, and by a cover differential speed reducer, make that hoisting crane both can hoist separately, the luffing operation element, also can make hoist, two kinds of operations of luffing work of composition operation simultaneously.By the compensation train of differential gear transmission, in luffing, hoisting drum makes goods or be similar to horizon along horizon automatically as required and moves.
The specific embodiment
Referring to Fig. 1 to Fig. 4, a kind of differential compensating gantry crane of the present invention comprises underframe 1 and the bearing 2 that is welded on machinery room bottom plate, is placed in assemblies such as lifting motor 3 on underframe 1 and the bearing 2, luffing motor 4, plate disc brake, toothed coupling 9, hoisting drum 5, amplitude-changing drum 6, drum shaft bearing 7.
Differential compensating gantry crane of the present invention is equipped with differential compensating retarder 8.One of them input shaft 81 of differential compensating retarder 8 is connected with lifting motor 3, and another input shaft 82 of differential compensating retarder 8 is connected with luffing motor 4.One of them output shaft 83 of differential compensating retarder 8 is connected with hoisting drum 5, and another output shaft 84 of differential compensating retarder 8 is connected with amplitude-changing drum 6.Lifting motor 3, luffing motor 4, hoisting drum 5, amplitude-changing drum 6 are set up a differential compensation system cleverly by one group of differential gear train.
In conjunction with referring to Fig. 5, differential compensating retarder 8 comprises the first order hoist differential planetary retarder 85 and the second stage hoist planetary reduction gear 86 and first order luffing gearing speed-reducer 87 and second stage luffing planetary reduction gear 88.
Plate disc brake comprise with lifting motor 3 bonded assembly lifting motor drgs 31 and with luffing motor 4 bonded assembly luffing electromotor brakes 41.
When hoisting motion separately, 41 brakings of luffing electromotor brake, luffing motor 4 quits work, lifting motor drg 31 has been opened at this moment, after lifting motor 3 starts,, just can drive hoisting drum 5 by first order differential planetary retarder 85 and the second stage planetary reduction gear 86 that hoists that hoists.
When luffing moves separately, lifting motor drg 31 is braked, lifting motor 3 quits work, luffing electromotor brake 41 is opened at this moment, 4 entrys into service of luffing motor, by gear Z1, Z2 in the first order luffing gearing speed-reducer 87 and second stage luffing planetary reduction gear 88, drive amplitude-changing drum 6.Meanwhile,, make the differential speed reducer that hoists obtain the speed ratio of a compensation, thereby make hoisting drum 5 reach the goods level luffing by required speed and direction folding and unfolding steel rope by the train Z1-Z3-Z4-Z5 that makes up the difference.
When compound motion, lifting motor drg 31 and luffing electromotor brake 41 all to be opened, lifting motor 3 and luffing motor 4 turn round together, and two kinds of motions are superimposed.
The goods level attitude compensation work principle of differential compensating gantry crane of the present invention is as follows:
1. luffing is not worked, when only hoisting operating mode, and the luffing motor braking, lifting motor drives hoisting drum through the differential compensating retarder, and then the folding and unfolding hoist rope, realizes hoisting and descending of goods.
2. hoist and do not work, when having only luffing work, the braking of lifting motor drg, luffing motor-driven amplitude-changing drum rotates, because differential principle, when amplitude-changing drum rotates, hoisting drum with in requisition for speed rotate, promptly when the jib amount of decrease, the hoisting drum rotation, the amount of being raised of goods when emitting a certain amount of hoist rope compensation owing to amount of decrease, when jib amplification, hoisting drum rotates, the slippage of goods when regaining a certain amount of hoist rope compensation owing to amplification, thereby the lifting amount of compensatory goods in amplitude changing process, making the motion track of goods in amplitude changing process is the level of approximation line.