RU2155680C1 - Truck-mounted hydraulic crane plant - Google Patents

Abstract

FIELD: construction and road-building machinery. SUBSTANCE: proposed hydraulic crane plant, capacity 20-25 t, has support frame 1 with extensible beams coupled with hydraulic supports 3 forming support outline and longitudinal metal structure 4 of box-section on which base unit 5 of slewing gear 6 is mounted. It has also turnable 7 with cabin, three-section telescopic beam 9 hinge-coupled with turnable for lifting by hydraulic cylinder and furnished with telescoping system, load safeguard system and hydraulic drive made to open double-pump hydraulic scheme. Telescoping system is made in form of two tandem-connected boom extending hydraulic cylinders 10, 11. One of working spaces of first hydraulic cylinder is coupled with space of second hydraulic cylinder through pilot controlled check valve 14. Load safeguard system has digital parameter indication. Support 6 outline dimensions are 4.2 x 5.6 m and length of telescopic boom equals 21.7 m. Telescopic boom is furnished with lattice goose-neck attachment. EFFECT: increased reliability. 2 cl, 2 dwg

Description

 The invention relates to construction and road engineering, in particular to automotive hydraulic crane installations designed to perform loading and unloading, construction and installation work and vertical transportation of goods in industry, construction and other sectors of the economy.

 Known hydraulic crane installation, adopted for the prototype, containing a support frame, including transverse boxes with retractable beams associated with hydraulic supports forming a support contour, and a longitudinal metal box-shaped structure on which a base assembly for a slewing ring device is mounted, a rotary platform with a cab , a three-section telescopic boom pivotally connected by its root section to a rotary platform and equipped with a telescoping system, a telescope lifting hydraulic cylinder boom boom, load limiting system and hydraulic drive (see. Truck crane. Maintenance and operation manual KS-4572. OO.OOOTO. M., TSNIITESTROYMASH, 1988, p. 8, 9).

 The disadvantages of the known device are the inability to ensure trouble-free operation of the crane at the maximum load capacity and in inaccessible places, as well as the low rigidity of the base unit around the perimeter of the slewing ring.

 The technical problem to which this invention is directed is to increase the performance of the crane installation by ensuring trouble-free operation at maximum load capacity and increasing the rigidity of the base unit around the perimeter of the slewing ring with a minimum frame weight.

 The problem is solved in such a way that in an automotive hydraulic crane installation with a lifting capacity of 20-25 tons, containing a support frame, including transverse boxes with retractable beams connected with hydraulic supports forming a support contour, and a longitudinal metal box-shaped structure on which a base unit for rotary support device, a rotary platform with a cab, a three-section telescopic boom pivotally connected by its root section to a rotary platform and equipped with a a telescoping system, a telescopic boom lifting hydraulic cylinder, a load limiting system, a hydraulic actuator made according to an open dual-pump hydraulic circuit, the base unit is a prism, the upper larger base of which is connected to the upper shelf of a longitudinal metal structure, and the height is equal to the section height of a longitudinal metal structure, the telescoping system is made in the form of two series-connected boom extension hydraulic cylinders, one of the working cavities of the first the hydraulic cylinder is connected to the cavity of the second hydraulic cylinder through a hydraulic lock, the load limiting system is made in the form of a microprocessor load limiter with digital indication of parameters, the support loop is 4.2 x 5.6 m in size, and the telescopic boom is 21.7 m long. If necessary, the telescopic boom can be equipped with trellised jib.

 Thus, the implementation of the base unit in the form of a prism, the upper larger base of which is connected with the upper shelf of the longitudinal box-shaped beam of the frame, and the height is equal to the height of the cross-section of the longitudinal beam, allows stiffness to be high and uniform around the perimeter of the slewing ring.

 The boom telescoping system includes two serially connected extension cylinders, one of the working cavities of the first hydraulic cylinder being connected to the cavity of the second hydraulic cylinder through a hydraulic lock, which ensures independence of the extension-retraction control of each of the two movable sections. The possibility of telescoping the boom with the load on the hook allows the crane to set loads in hard-to-reach places, carrying them among the mounted structures.

 Safe operation of the crane is ensured by a range of instruments and devices, including a microprocessor load limiter with digital indication of parameters on a display in the driver's cab. The load limiter can operate in the coordinate protection mode of the crane and has a built-in device for fixing characteristics.

 In FIG. 1 is a schematic diagram of an automotive hydraulic crane installation.

 In FIG. 2 is a schematic diagram of a hydraulic actuator.

 Automotive hydraulic crane installation includes a support frame 1, including transverse boxes 2 with retractable beams associated with hydraulic bearings 3, forming a support contour, and a longitudinal metal box-shaped structure 4, on which a base unit 5 for a slewing ring 6 is mounted, a rotary platform 7 with a cab 8, a three-section telescopic boom 9, pivotally connected by its main section with a rotary platform 7 and equipped with a telescoping system made in the form of two in series connected hydraulic cylinders 10, 11 of the extension of the boom, while one of the working cavities 12 of the first hydraulic cylinder 10 is connected to the cavity 13 of the second hydraulic cylinder 11 through a hydraulic lock 14, a lifting hydraulic cylinder 15 of the telescopic boom 9, a load limiting system in the form of a microprocessor load limiter (not shown) with a digital an indication of the parameters, and a hydraulic actuator made in accordance with an open dual-pump hydraulic circuit 16. The supporting contour has dimensions of 4.2x5.6 m and the telescopic boom has a length of 21.7 m.

 The telescopic boom 9 may be provided with a trellised jib (not shown). The crane is mounted on the base vehicle 17.

 Automotive hydraulic crane installation operates as follows.

 The crane installation with a lifting capacity of 20-25 tons is designed for loading and unloading, construction and installation works on dispersed objects. The hydraulic drive has two axial piston hydraulic pumps, which are connected to the power take-off via drive shafts. Power is taken from the engine of the car 17 through the gearbox. All crane installation mechanisms have an individual drive with independent control from hydraulic motors and hydraulic cylinders. It is possible to combine work operations.

 At the beginning of the crane installation with the help of a hydraulic actuator, the hydraulic supports 4 are extended. The crane installation is hung out on the hydraulic supports 4, while the base vehicle 17 is suspended from the support frame 1.

 The telescopic boom 9 with a length of 21.7 m provides a wide area and a large height of the load when working. To increase the hook lifting height and the size of the boom space, the crane installation can be equipped with a 9 m long trellis which is mounted on the head of the boom 9. The telescoping system of the boom 9 includes two extension cylinders 10, 11, which ensures independence of the extension of each retraction two movable sections. The possibility of telescoping the boom with the load on the hook allows the crane to set loads in hard-to-reach places, carrying them among the mounted structures.

 Safe operation of the crane installation is ensured by a microprocessor load limiter with digital indication of parameters on the display in the driver's cab. The load limiter can operate in the coordinate protection mode of the crane and has a built-in device for fixing the characteristics - the "black box".

Claims (2)

 1. Automotive hydraulic crane installation with a lifting capacity of 20 - 25 tons, containing a support frame, including transverse boxes with retractable beams associated with hydraulic bearings forming a support contour, and a longitudinal metal box-shaped structure on which a base assembly for a slewing-slewing device is mounted, rotary a platform with a cabin, a three-section telescopic boom pivotally connected by its root section to a rotary platform and equipped with a telescoping system, a lifting cylinder telescopic boom, load limiting system, and hydraulic drive, characterized in that the hydraulic drive is made according to an open dual-pump hydraulic circuit, the base unit is a prism, the upper base of which is connected to the upper shelf of a longitudinal metal structure, and the height is equal to the height of the box section of a longitudinal metal structure, system telescoping is made in the form of two serially connected boom extension hydraulic cylinders, while one of the working cavities of the first hydro the cylinder is connected to the cavity of the second hydraulic cylinder through a hydraulic lock, the load limiting system is made with a digital indication of the parameters, the support loop has dimensions of 4.2 x 5.6 m, and the telescopic boom has a length of 21.7 m.  2. Automotive hydraulic crane installation according to claim 1, characterized in that the telescopic boom is equipped with trellised jib.

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