RU1794872C

RU1794872C - Crane telescopic boom

Info

Publication number: RU1794872C
Application number: SU904849162A
Authority: RU
Inventors: Борис Клеоникович Марысаев; Алексей Николаевич Сенцов
Original assignee: Научно-Производственное Объединение "Трансстроймаш"
Priority date: 1990-07-10
Filing date: 1990-07-10
Publication date: 1993-02-15

Abstract

Использование: в подъемных механизмах , в частности в кранах дл монтажных, подъемно-транспортных операций и т.п. Сущность изобретени : .кранова телескопическа стрела содержит неподвижную 1 и выдвижную 2 секции, механизм выдвижени секции 2, включающий замкнутую цепь, огибающую звездочки, одна из которых установлена на неподвижной секции 1 и св зана с приводом, друга - на штанге, закрепленной на секции и одно из звеньев цепи закреплено на выдвижной секции 2, последн из которых св зана с механизмом выдвижени , образованным щарнирно установленной в полости секции 1 штангой 5 с приводной и неприводной звездочками 8 и 9, зацепленными с цепью, соединенной одним звеном с секцией 2. Штанга опираетс роликом 7 на внутреннюю секцию. При перемещении цепи перемещаетс секци 2. 1 з.п. ф-лы. 2 ил.Usage: in hoisting mechanisms, in particular in cranes for installation, hoisting and transport operations, etc. SUMMARY OF THE INVENTION: a telescopic boom crane comprises a fixed 1 and a retractable 2 section, a mechanism for extending the section 2, including a closed chain enveloping the sprockets, one of which is mounted on the fixed section 1 and connected to the drive, the other on a boom mounted on the section and one of the chain links is fixed to the pull-out section 2, the last of which is connected to the pull-out mechanism formed by a rod 5 pivotally mounted in the cavity of section 1 with the drive and non-drive sprockets 8 and 9 engaged with the chain, a constant section with link 2. The rod 7 is supported on the roller inner section. When moving the chain moves section 2. 1 zp f-ly. 2 ill.

Description

Изобретение относитс к подъемным механизмам дл строительно-монтажных работ, подъемно-транспортным операци м и т.п. , ,FIELD OF THE INVENTION The invention relates to hoisting mechanisms for construction and installation works, hoisting and transport operations, and the like. ,,

Известна телескопическа стрела, со- держаща основную секцию, шарнирно закрепл емую на рабочей платформе, выдвижную секцию, св занную с рабочим органом, механизм выдвижени секции, включающий звездочки, установленные на секци х стрелы, цепь, огибающую звездочки , привод выдвижени , выполненный в виде гидроцилиндра, св занного с основной секцией и несущий звездочку на штоке.Known telescopic boom containing the main section, pivotally mounted on the working platform, a retractable section associated with the working body, a mechanism for extending the section, including sprockets mounted on the sections of the boom, a chain, the envelope of the sprockets, the extension drive, made in the form a hydraulic cylinder connected to the main section and bearing an asterisk on the stem.

Недостатком подобной конструкции в- л етс использование гидроцилиндра, огра- ничивающеговылет стрелы технологическими возможност ми техники, повышенные требовани к технологии изготовлени учитыва большое количество за- пасовок, увеличенные габариты издели ввиду размещени в полости секций р дом нескольких элементов конструкции.A drawback of such a design is the use of a hydraulic cylinder restricting the boom reach with the technological capabilities of the equipment, increased requirements for manufacturing technology, taking into account a large number of stocks, increased dimensions of the product due to the placement of several structural elements in the cavity of the sections.

Известна также телескопическа стрела , содержаща основную секцию, выдвиж- ную, св занные с механизмом выдвижени , включающим в себ цепь, огибающую звездочки , установленные на приводе, выполненном в виде гидроцилиндра.A telescopic boom is also known, comprising a retractable main section coupled to an extension mechanism including a chain enveloping the sprockets mounted on an actuator in the form of a hydraulic cylinder.

Недостатком указанной конструкции также вл етс ограниченный мах возможной длиной гидроцилиндра вылет стрелы, увеличенное поперечное сечение стрелы ввиду совместного размещени элементов механизма.The disadvantage of this design is also the limited maximum possible length of the hydraulic cylinder, the outreach of the boom, the increased cross-section of the boom due to the joint placement of the elements of the mechanism.

Наиболее близкой к за вленной вл етс кранова телескопическа стрела, содержаща неподвижную и выдвижную секции и цепную передачу дл перемещени последней , включающую две звездочки, одна из которых приводна , и огибающую их замкнутую цепь, жестко соединенную одним звеном с выдвижной секцией.Closest to the claimed invention is a telescopic boom crane, which has a fixed and extendable section and a chain gear for moving the latter, including two sprockets, one of which is driven, and a closed chain enveloping them rigidly connected by one link to the sliding section.

Недостатком известной стрелы вл ютс большие размеры поперечного сечени , вес и трудоемкость изготовлени стрелы.A disadvantage of the known boom is the large cross-sectional dimensions, weight and laboriousness of manufacturing the boom.

Цель изобретени -уменьшение размеров поперечного сечени стрелы,.ее веса и трудоемкости изготовлени .The purpose of the invention is to reduce the size of the cross section of the boom, its weight and the complexity of manufacturing.

Поставленна цель достигаетс тем, что стрела снабжена полой штангой, одним концом шарнирно закрепленной на основной секции, другим взаимодействующей с выФормула изобретени The goal is achieved in that the boom is provided with a hollow bar, one end pivotally mounted on the main section, the other interacting with the invention

Claims

1. A crane telescopic boom comprising a fixed and extendable section and a chain gear for moving the latter, including two sprockets, a sliding section by means of a roller, sprockets are placed at the ends of the rod, the chain is closed, one of the branches of which is located in the cavity of the rod.

Figure 1 shows the proposed arrow, General view; figure 2 - node I in figure 1.

The telescopic boom crane consists of an outer main section 1 and an inner retractable section 2.

Lugs 3 are secured to section 1 for securing, for example, to a vehicle. A polyspast flea 4 is mounted on the free end of section 2 to accommodate a cable with a suspended load carrier.

A rod 5 is placed in the cavity of section 1, the rod 5 is attached at one end pivotally with a finger 6 to section 1. At the other end of the rod, a roller 7 is mounted that interacts with the inner surface of section 2. Two or more rollers can be installed to prevent bending arrows. At the ends of the rod, sprockets 8, 9 are fixed on the axes, covered by a closed chain 10, and one branch is placed in the cavity of the rod. One of the links of the outer branch of the chain with the help of the bracket 11 is fixed to section 2, between it and the adjacent link there is a tensioning device including a worm to 12 engaged with a wheel 13, a sleeve 14 with an external and internal thread installed inside the wheel, screw 15, meshed with the internal thread of the sleeve and connected to the chain link. The sprocket 9 is rigidly fixed to the shaft of the hydraulic motor 16. An opening can be made in the wall of section 1 to carry out operations to control the chain tension and adjust it.

The device operates as follows.

To extend section 32, the hydraulic motor 16 is turned on, transmitting rotation to the sprocket 8, 9 move the chain. A chain attached to the section by one link moves the section 2, its extension or extension.

Considering that the rod rests at one end on the boom section and experiences only compressive loads of the boom, it can easily be made arbitrarily long.

on which the drive chain is made, and a closed chain enveloping them rigidly connected by one link with a retractable section, characterized in that, in order to reduce the cross-sectional dimensions of the boom, its weight and the complexity of manufacturing, the chain gear is mounted inside the retractable section by means of a rod supporting at its ends, sprockets and one end pivotally connected to the root part of the fixed section, the other end of which is made with at least one roller to interact with

the inner surface of the pull-out section.

2. The boom according to claim 1, so that the rod is made with a through longitudinal hole in which one chain branch is placed.