SU929531A1

SU929531A1 - Load suspension of lifting crane

Info

Publication number: SU929531A1
Application number: SU802900051A
Authority: SU
Inventors: Андрей Федорович Шевченко; Николай Прокофьевич Колесник; Леонид Андреевич Хмара; Юрий Абрамович Гладков; Андрей Николаевич Проскурин
Original assignee: Днепропетровский инженерно-строительный институт
Priority date: 1980-03-24
Filing date: 1980-03-24
Publication date: 1982-05-23

Description

(5) ГРУЗОВАЯ ПОДВЕСКА КРАНА(5) CRANE CARGO SUSPENSION

II

Изобретение относитс к грузоподъемным машинам работающим с вибрирующими грузами, а именно к грузовым подвескам крана.The invention relates to lifting machines working with vibrating loads, namely to crane suspensions.

Известна грузова подвеска крана , содержаща цилиндр с верхним и нижним несущими дисками,стержень с двум предварительно нагруженными пружинами, между которыми размещена дополнительна масса и грузозахват- ный орган 03.A crane suspension is known, containing a cylinder with upper and lower bearing discs, a rod with two preloaded springs, between which an additional mass is placed and a lifting body 03.

Недостатком известного устройства вл етс высока чувствительность К незначительному изменению частоты возмущающей силы вибрирующего груза , что соответственно снижает ее эффективностьA disadvantage of the known device is high sensitivity to a slight change in the frequency of the disturbing force of the vibrating load, which accordingly reduces its effectiveness.

Цель изобретени - повышение эфф ективности гашени колебаний.The purpose of the invention is to increase the efficiency of damping.

Эта цель достигаетс тем, что подвеска снабжена дополнительным упругим элементом переменной жесткости , а на конце стержн смонтирован опорный диск, при этом дополнительНЫЙ упругий элемент установлен на стержне между опорным диском и верхним несущим диском.This goal is achieved by the fact that the suspension is provided with an additional elastic element of variable stiffness, and a supporting disk is mounted at the end of the rod, while the additional elastic element is mounted on the rod between the supporting disk and the upper bearing disk.

При этом, дополнительный упругий элемент выполнен цилиндрической формы с каналами, расположенными по концентрическим окружност м и имеющими различную глубину, увеличивающуюс по мере приближени к центру.In this case, the additional elastic element is cylindrical in shape with channels arranged in concentric circles and having different depths, increasing as they approach the center.

На чертеже показана предлагаема грузова подвеска крана, продольный разрез.The drawing shows the proposed cargo crane suspension, longitudinal section.

Claims

The crane's cargo suspension includes a load gripping body 1 made in the form of a hook articulated to the lower bearing disk 2 and fixed in it by a nut 3, the lower bearing disk 2 is connected to the upper bearing disk 5 by means of a cylinder C, the connecting rod 6 passing through an axial hole end of the thread. Springs 7 are mounted on the rod 6, between which an additional mass 8 is clamped with the possibility of vertical movement along the rod 6. The mass 8 is clamped between the springs 7 by washers 9 and a nut 10. The upper part of the rod 6, the spring 7 and the mass 8 are enclosed by a casing 11. On the bottom a part of sr) n 6 is wearing a resilient element (damper) 12 with axial channels 13. The damper 12 is located between the support disk H and the upper carrier disk 5. In the damper 12, axial channels 13 are made in concentric circles, their depth increases as they approach to the center. The crane load suspension is performed as follows. When there is a vibrating load on the hook 1, the effect of its disturbing force is transmitted through the lower carrier disk 2, cylinder i, the upper carrier disk 5 to an elastic element of variable stiffness 12. Due to the effect of the internal vibration train, the oscillation energy is damped 12, the rest of the energy is expended on the oscillation of the additional mass 8. The magnitude of the mass 8 is chosen in such a way that the frequency of its own oscillations on the elastic constraints x 7 is equal to the frequency of the disturbing forces . As a result, the disturbing force of the vibrating load is balanced by the reaction of the additional mass 8 and the suspension remains motionless. The use of the proposed device for various masses of a vibrating load is carried out by changing the stiffness of the elastic element, which for this purpose is equipped with vertical channels of different depths. 4 Ensuring the stability of damping occurs by changing the stiffness of the elastic link 12. The implementation of the proposed cargo suspension will allow you to isolate the crane design from the effects of vibration when working with vibrating loads, to reduce the dynamic loads on the crane and to improve the working conditions of the crane. Claim 1. Cargo crane suspension, containing a cylinder with upper and lower bearing discs, a rod with two preloaded springs, with which an additional mass is placed and a lifting body, characterized in that, in order to increase the damping efficiency, it is equipped with additional elastic element of variable stiffness, and at the end of the rod the supporting disk is mounted, while the additional elastic element is mounted on the rod between the supporting disk and the upper bearing disk.

2. Suspension according to Claim 1, characterized in that the additional elastic element is cylindrical in shape with channels arranged in concentric circles and having different depths, increasing as the center approaches k. Sources of information taken into account during the examination 1. USSR author's certificate No. 635029, cl. B 66 s 1 / 34.15.03.77 (prototgip).