Portal crane structure and working principle
Portal crane is a metal structure, the four major agencies and the three major components of the overall system. Figure 1-1 for the M10-25 portal crane, its metal structure: a boom system, Renzi Jia 4, Room 6, dial 7, 8, in turn, door-9, 10 ladder platform, cab 14. Four bodies have: Change bodies 2, operating 12 agencies, or organisations from 15, 16 and the rotary mechanism for the completion of cross pieces of action which the hydraulic system 3.Three systems: the power supply to the control panel 21, Resistance Box 22; manipulation ud to manipulate the drivers at 20; ud for curity and anti-overload limiter 5 to 19 devices. In addition, for ea of manipulation and grab 18 t grab stabilizer 17, and cable volumes SR ll, 13, and other support under. The components to work together to complete the lifting of goods and transport operations.
1. Lifting bodies
In order to facilitate the transition to double-rope grab bulk cargo handling, general portal cranes from the double-reel or body, the two motors were driven by their respective reduc
弦外之音er, a slowdown after three output and promote their respective volumes of wire rope SR. Or from one end of rope to a fixed volume in Brief, Renzi Jia on the other end through the pulley and compensation as the two ends of the bridge of the no of the pulley, and then fixed on the hook or grab.
2. Change agencies
The portal crane Change often there are veral forms of transmission, the transmission line as:
放孔明灯 (1) fan-shaped gear drive a motor reducer a Change Change gear of a small fan-shaped gear of a tension bar, so that the main par Movement (Change);
(2) Change screw and nut drive a motor reducer a Change Change Change screw a nut, so that the main par Movement (Change)美人如钩
(3) gear, rack drive a motor reducer a Change Change Change rack of a small gear, the main leader movement (Change);
(4) Change hydraulic transmission of a hydraulic pump motor fuel tank of a variation of a connecting rod. At the main Movement (Change).
In order to improve the efficiency of cranes and better meet operational requirements, using a portal crane working Change body, the band t range. Change the characteristics of this work is the number of frequent, varying resistance larger and higher
speed range. And then, if only a simple swing crane boom Change the way, it will cau the focus of Boom, by the admission of devices and mobile hanging in the level of the sport at the same time have a take-off and landing, in Figure 1-2. When the boom of a change in perspective α, by the hanging of a certain distance from Mobile, but also improve the hanging of a certain height h.This makes drive in the Change process, in addition to general must overcome the resistance, it is also necessary to overcome becau of boom and hanging themlves lifting heavy objects caud by resistance, not only to increa power-driven, but also an increa of drivers operating location Difficulties. To this end, it was designed Boom lifting weights and balance system of compensation device. Boom balance system is the role of the boom system in the center of Change does not occur in the cour of movements; lifting weights compensation device that is the role of weight in the process of variation along the track of moving clor to level.
In the portal crane, the compensation devices are generally two methods: the compensation law and the composition of the rope Boom Compensation Act.
(1) the rope's Compensation Act
In lifting the rope pulley system to introduce compensation group, in Figure 1-3. - Oriented arm of a crane and pulley A rotation of the stent on the pulley B, compod of compensation-pulley blocks. When t up or arm, the arm-pulley A 0 A along with a radius of the arc for the movement to A ', at this time, rehabilitation pulley group the distance between the two pulley around. By choosing the appropriate size and pulley group rate, we can relea to the pulley group of the rope, to compensate for the higher end of the crane, so that heavy objects along the approximate level of mobile line.
(2) portfolio Boom Compensation Act
①徐麒麟 This is a special type of split-hinged combination to achieve compensation purpos, figure 1-4 is one of the form. 2 as the bridge of the no with a hinged Boom, Lasheng 3 fixed to the trunk beam, the other end connected to the crane rotating platform on the framework. Change, as the bridge of the no due to swing, Lasheng point of contact with their position that is changing, which is equivalent to the diagram of a quadrilateral hinged side in the event of a change. If appropriate choice quadrilateral side
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of the ratio, you can achieve when heavy objects can range along the approximate level of mobile line.
At prent, China's production of the portal cranes are even Qian compensation to the four institutions.
②世界上最高大的人 plans for the 1-5 combination Boom Compensation Act of another form, it is also unchanged from a number length of the rigid bar. The system is also a feature of the cam
paign plane with four Qian agencies. It is also the split-swing, as a bridge of the no to the endpoint in a certain range of movement for clo to the horizon, such reached weights in the range of movement when the purpo.
3. Rotating bodies
From one or two rotating torque motor output of the worm reducer or gear reducer slowdown, driven rotary small gear, the gear to promote small fixed on the rotating column to the ring gear, so that the upper portal crane Rotation, to complete their tasks.
4. Run institutions
By two or four walking by their respective torque motor output slowdown after the reducer, transmission gear to open group, and then drive round the door Walking along the track of movement to achieve the door for the purpo of changing jobs. It can also be ud for loading and unloading of cargoes walk. The portal crane lifting, rotating, varying the three institutions can work alone or joint operations, to complete the necessary work content.甜品店的发展前景
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