RU2571311C2 - Wrecker crane - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to truck-mounted cranes, particularly to truck-mounted servicing stations. Wrecker crane comprises servicing station, jib, jib head, braces unit, winch, vehicle front spring locking device and hook suspension. Jib is composed rod of box-like cross-section with foot composed of two-backup transverse bar. Jib head includes guide roller with load cable. Jig support guy is composed of articulated rod elements with jig thrust arranged nearby guy top hinge pivot. Bottom hinge pivot is secured and station body front wall. Hook suspension is composed of the hook with one cable.

EFFECT: perfected design.

6 dwg

Description

The invention relates to cranes in trucks, and in particular to cranes in an automotive workshop.

Known boom crane mounted at a maintenance workshop (see book: Maintenance workshop MTO-80. - M.: Military publishing house, 1984. - S.109-111) [1], which includes a truck - workshop, boom , head, rope stretch arrows, cargo winch, hook suspension in the form of a double pulley block.

Boom crane [1] has several disadvantages. The boom made of two pipes has a complex structure. The stretching of the boom made of two ropes is not technological and does not ensure the stability of the boom under the action of horizontal inertia and wind load. These shortcomings reduce the technical level of the crane and its effectiveness.

The objective of the invention is to increase the efficiency of the crane by creating a simpler and more reliable construction of the crane, which is an additional equipment of the workshop mounted on a car.

The problem is solved in that the boom crane containing a car workshop, an arrow, an arrow head, a block, an arrow extension, a winch, a device for locking the front springs of a car, a hook suspension, according to the claimed invention, the arrow is made in the form of a straight box section rod with a base in the form of a double support cross beam; the boom head includes a guide roller for the cargo rope; the extension of the boom is made sectional of successive pivotally connected rod elements, has an emphasis for the boom at the upper hinge of the extension, while the lower hinge of the extension is fixed to the front wall of the body of the workshop; hook suspension is made in the form of a hook with one rope. In the second embodiment of the invention, the hook suspension is made in the form of a double pulley block.

Thus, the problem is solved by simplifying and improving the design of the boom, by installing on the head of the boom near the cargo block an additional guide roller.

Changing the design of the stretch allowed to protect the crane from the action of horizontal inertia forces on the boom during sudden pulling away, the effects of wind load and in other cases.

The improvements made turn the jib crane into a useful device for the automobile workshop, which significantly expands its technical capabilities and increases the efficiency of the crane.

The claimed invention is illustrated by drawings.

Figure 1 shows a General view of the boom side; figure 2 is a top view of the boom; figure 3 shows the base of the boom in two projections; figure 4 presents the head of the arrow in two projections; figure 5 shows the mounting braces on the body of the workshop at point B; figure 6 shows the options for hook suspension.

Additionally, in figure 1, figure 2 letters denote: A - node head boom; In - the attachment point of the extension on the body; A ₁ - node connecting stretch with the head of the boom; C - swivel assembly of stretching sections; E, F - nodes of the left and right bearings of the hinged mounting of the base of the boom on the front frame of the car; G - hook suspension.

Boom crane contains vehicle 7; workshop body 2; arrow 3; boom head block 4; guide roller 5 of the boom head; boom base 6; front frame 7 of the car; roller 8, cargo winch 9; rope 10; hook suspension 11; double pulley 12; stretching sections 13, 14; hinge 15 stretching sections; hinge 16 mounting extensions on the body; an emphasis 77 at the top hinge of an extension.

Crane boom works as follows. The arrow 3 in figure 3 is made in the form of a straight rod box-shaped section from standard elements of the rental; the base of the boom is a transverse beam 6 with two hinged supports E, F (figure 3), mounted on the front frame 7 of the car. The arrow head A in FIG. 4 contains a block 4, a guide roller 5, due to which the rope 10 located under the boom is guided to the cargo winch 9 of the car. This design has a minimum metal consumption, provides the necessary lateral stiffness, thanks to the spaced apart widths of the supports E, F on the front frame of the car.

Stretching AB arrows made of two rigid rods 13, 14, interconnected by a hinge 15 (figure 1, figure 2). The stretch is pivotally fixed at point A ₁ on the boom head and at point B on the front wall of the workshop body (Fig. 1, Fig. 5); an emphasis 17 is fixed at the upper hinge of the extension.

If with a strong wind or a large horizontal inertia, the arrow begins to fall on the cab, then the stretch marks 13, 14 will begin to move down. When the emphasis 17 approaches the boom 3 (figure 1), the further fall of the boom will stop. When the horizontal force on the boom disappears, it returns to its working position.

This design of the stretch prevents the boom 3 from falling onto the car cabin during transport movements on a slope and abrupt pulling of the car. The front wall of the body at point B in some cases can be reinforced with additional brackets associated with the frame of the car. The hook suspension 11 can be made with one rope or in the form of a double pulley block (node G in Fig.6).

When designing a hook suspension you have to solve a controversial problem. In one case, a double pulley block allows you to use a thinner cable and increase the lifting capacity of the crane. However, at the same time, in the lowering mode of the hook suspension without load, the force in the cable decreases and the process of idling the cable from the winch drum worsens. In the case of using one cable on a hook suspension, the diameter of the cable increases, therefore, when idling the hook suspension, it is necessary to ensure sufficient rope tension.

In both cases, some weighting of the hook suspension or the use of an additional load of 10-15 kg in weight on the hook suspension, which provides tension to the rope branch when the rope is idle from the winch drum, is useful.

To lift the load with hook 11, the operator, while in the car cabin, turns on the drum of the cargo winch 9 to lift the load, the rope is wrapped around the drum of the cargo winch and the load is lifted.

The lifted cargo can be transported over small distances at low speed to the place of loading into the vehicle or to the place of storage of the cargo. In transport modes of movement, the hook suspension 11 is fixed on the boom 3 with the subsequent tension of the rope with a winch 9.

The proposed boom crane design is an effective additional equipment for a car workshop.

Claims (1)

A boom crane comprising a car workshop, an arrow, an arrow head, arrow extensions, a winch, a device for locking the front springs of a vehicle, a hook suspension, characterized in that the arrow is made in the form of a box-section rod with a base in the form of a double support cross beam, the arrow head contains a guide roller for a freight rope, the boom extension is made sectional from successive pivotally connected rod elements, has a support for the boom at the upper extension hinge, while the lower ball nir extensions are fixed on the front wall of the workshop body, the hook suspension is made in the form of a hook with one rope.

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