WO2012088858A1

WO2012088858A1 - Truck crane

Info

Publication number: WO2012088858A1
Application number: PCT/CN2011/076385
Authority: WO
Inventors: 李安强; 吴国锐
Original assignee: 湖南三一智能控制设备有限公司; 三一汽车起重机械有限公司
Priority date: 2010-12-28
Filing date: 2011-06-27
Publication date: 2012-07-05
Also published as: CN102001589A

Abstract

A truck crane comprises a first rocking support leg (3) and a second rocking support leg (4) both of which pivoted on the rear truck frame (2) of a rotary center (1), and driving devices for driving the first rocking support leg (3) and the second rocking support leg (4) to rock. The first rocking support leg (3) and the second rocking support leg (4) are arranged at the tail of the track in a cross folded state or a "八" -shaped unfolded state. The truck crane has shorter rear suspend, compact structure, lighter weight and increased span, so as to improve stability.

Description

Crane

The present application is filed on Dec. 28, 2010, the disclosure of which is hereby incorporated by reference in its entirety in its entirety in its entirety in the the the the the the the the the Technical field

This invention relates to automotive cranes, and more particularly to improvements in the rear legs of automotive cranes. Background technique

At present, the legs of the traditional four-bridge truck crane are set to the "H" type of extension legs. Figure 1 shows a schematic view of the structure of a conventional four-bridge truck crane. As shown in FIG. 1, the four-bridge truck crane includes a first bridge 2, a second bridge 3, a third bridge 5, and a fourth bridge 6, and a front leg 4 disposed at the second bridge 3, behind, and rear. The leg 7, which is arranged at the fourth bridge 6, is provided with a fifth leg 1 in front of the first bridge 2 in order to increase front stability. This type of leg is simpler in structure, easy to manufacture, and easy to install.

As the tonnage of truck cranes continues to increase, from the perspective of stability, the rear suspension of the frame (ie the rear frame of the center of rotation) is as long as possible, and the rear legs should be moved as far as possible to increase the rear legs. Compared with the span of the front leg, the stability of the truck crane is improved. However, from the perspective of the departure angle, the rear suspension portion of the frame is as short as possible, so that the rear suspension portion of the truck crane does not interfere with the slope when the vehicle is off the slope. .

In the existing truck cranes, the front and rear fixed leg boxes are used, and the rear leg span is determined by the installation position of the fixed leg box, and the tonnage of the four-bridge crane is increased to meet the requirements of the rear stability. The rear leg span is increased, limited by the departure angle, and the rear leg cannot be moved too much, resulting in stability that does not meet the requirements.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a truck crane with improved rear legs to solve the problem of separation angle and stability. To this end, the present invention provides a truck crane including a first swinging leg pivotally coupled to a rear frame of a swing center, a second swinging leg, and driving the first swinging leg and the second swinging leg. The oscillating driving device, wherein the first swinging leg and the second swinging leg have a cross-folding state at the rear of the vehicle.

Further, the above drive device is a cylinder.

Further, the first swinging leg and the second swinging leg respectively have at least one movable leg and a telescopic device for driving at least one movable leg to expand and contract, wherein the last movable leg is provided with a vertical leg.

Further, the rear frame of the rotating center has a dovetail shape, and the first swinging leg and the second swinging leg are located on the left and right sides of the dovetail bottom edge.

Further, the first swinging leg and the second swinging leg are staggered in the height direction of the truck crane.

Further, the above-described truck crane includes four axles, and a front leg is provided at the rear of the second bridge. Further, the front leg is a fixed leg or a swing leg.

Further, a portion of each of the swinging legs that overlaps with the frame and a portion of the frame that overlaps with the swinging leg are a box structure, wherein the pivoting shaft of each of the swinging legs and the frame is a hollow shaft .

Compared with the prior art, the invention has the following advantages: 1. The rear suspension is short in the driving state, the structure is compact, and the weight is lighter; 2. The longitudinal distance of the front and rear support points on the rear section of the frame during working state is 10,000 Compared with the same span, the corresponding distance of the 'Ή' type combination telescopic legs is much smaller, which enhances the strength of the rear section of the frame; 3. The span can be increased to improve the stability of the truck crane.

Other objects, features, and advantages of the invention will be set forth in the <RTIgt; DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in FIG In the drawings: Figure 1 shows a schematic structural view of a prior art four-bridge truck crane; 2 is a schematic view showing the layout of a rear swinging leg of a four-bridge truck crane according to a preferred embodiment of the present invention, wherein the rear swinging leg is in a cross-folding state;

Figure 3 shows a side view of the frame shown in Figure 2;

Figure 4 is a schematic view showing the rear swinging leg of the frame shown in Figure 2 in a figure-eight unfolded state;

Figure 5 shows a side view of the frame of Figure 4. detailed description

The embodiments of the present invention are described in detail below with reference to the drawings, but the invention may be embodied in many different ways as defined and covered by the claims.

2 to 5 are schematic views showing the layout of an automobile crane having a rear swinging leg according to a preferred embodiment of the present invention. As shown in FIGS. 2 to 5, the first swing leg 3, the second swing leg 4, and the cylinder 5 and the drive for driving the first swing leg to be pivoted on the rear frame 2 of the swing center 1 The second swinging leg performs a swinging cylinder 6, and the first swinging leg 3 and the second swinging leg 4 are in a cross-folding state during transportation, and are in a figure-eight unfolded state during the working time.

Usually the rear frame part is called the rear part of the frame, and the rear suspension part refers to the distance from the last bridge to the rearmost end of the frame.

In the present invention, the problem of insufficient stability of the frame is solved by changing the rear leg to the retractable swinging leg, and at the same time, the fixed leg case directly reduces the weight of the frame and solves the departure. Insufficient angles and other issues. When the rear swinging leg is retracted, it is turned back, which is beneficial to shorten the distance between the rear section of the frame and the center of rotation, thereby improving its strength. When the swinging leg is fully contracted into position, it is cross-shaped, which is beneficial to reduce the length of the backrest and increase the departure angle.

Wherein, the first swinging leg 3 and the second swinging leg 4 are cross-folded in the transport time course, and the first swinging leg 3 and the second swinging leg 4 are arranged in a staggered manner in the height direction of the truck crane. achieve. Of course, it can also be realized by other means, for example, the frame portion pivotally connected to the first swinging leg 3 is arranged to move up and down, and when transporting, the first swinging leg 3 is oriented in the height direction with respect to the second swinging branch. Leg 3 staggered, located at work In the same plane.

In a preferred embodiment of the invention, the driving means for driving the first swinging leg and the second swinging leg to swing are the cylinder 5 and the cylinder 6. In other embodiments, the swinging leg can effect the swinging and folding of the first and second swinging legs by means of a gear to drive the ring gear. Specifically, a ring gear is respectively disposed on the first swinging leg and the second swinging leg and is meshed with the same driving gear, and the driving gear can be automatically driven or manually driven by a driving device such as a hydraulic motor or a motor.

In a preferred embodiment of the invention, the first swing leg 3 includes a swinging leg box 31 and a movable leg 32 in the swing leg box and a cylinder (not shown) that drives the movable leg to retract and is mounted A vertical leg 33 on the movable leg 32. The second swinging leg 4 includes a swinging leg box 41 and a movable leg 42 in the swinging leg box and a cylinder (not shown) that expands and contracts the movable leg 42 and a vertical mounted on the movable leg 42 Leg 43.

In other embodiments according to the present invention, the first swinging leg 3 and the second swinging leg 4 may have two active legs. At this time, the telescopic device that drives the movable leg 42 to expand and contract may adopt an existing fixed branch. The driving method of the cylinder and the rope row on the leg.

In a preferred embodiment of the present invention, the rear frame 2 of the swing center 1 has a dovetail shape, and the left and right sides of the bottom side of the dovetail rear frame are provided with a pivotal connection between the first swinging leg 3 and the second swinging leg 4. Mounting seat. In other embodiments of the invention, the rear frame of the swivel center 1 may also have a T-shape or other shape that facilitates mounting the first swing leg 3 and the second swing leg 4 at a distance.

The dovetail-shaped rear frame 2 easily meets the following design requirements: the installation position of the pivoting shaft of the rear swinging leg is determined to meet the longitudinal and span distance of the crane and the leg width of the leg after retraction, and also to ensure The rear suspension cannot be too long, and the departure angle meets the design requirements.

In a preferred embodiment of the invention, the truck crane comprises four axles, namely a first bridge 7, a second bridge 8, a third bridge 9 and a fourth bridge 10, wherein a rear portion of the second bridge 8 is provided The front leg 11 is a fixed leg. In other embodiments, the front leg 9 can also be a swinging leg. For the arrangement of the swinging leg, reference can be made to the Chinese invention patent CN200820176517.6, which is incorporated herein by reference in its entirety. In a preferred embodiment of the present invention, the portion of each of the swinging legs 3, 4 that overlaps with the frame and the portion of the rear frame 2 of the center of rotation 1 that overlaps the swinging legs are box structures to improve The local strength, wherein the pivoting shafts 12 of each of the swinging legs and the frame are hollow shafts, facilitates installation and reduces weight.

Compared with the prior art, the present invention obtains the following advantages:

1. The rear suspension is shorter when driving, the structure is compact, and the weight is lighter;

2. In the working state, the longitudinal distances of the front and rear support points on the rear section of the frame are much smaller than the corresponding distances of the "H" type combined telescopic legs of the same span, thereby enhancing the strength of the rear section of the frame;

3. After adopting this scheme, the span can be increased to effectively improve the stability of the truck crane. The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention. Description of the reference numerals

1 rotation center 2 rear frame

3 first swinging leg 4 second swinging leg 5, 6 oil rainbow 7 first bridge

8 second bridge 9 third bridge

10 fourth bridge 11 front legs

12 pivot shafts 31, 41 swing legs

32, 42 active legs 33, 43 vertical legs.

Claims

Rights request

A truck crane, comprising: a first swinging leg pivotally attached to a rear frame of a center of rotation, a second swinging leg, and driving the first swinging leg and the second swinging leg A driving device that performs swinging, wherein the first swinging leg and the second swinging leg have a cross-folding state at the rear of the vehicle.

The truck crane according to claim 1, wherein the driving device is a cylinder.

The truck crane according to claim 1, wherein the first swing leg and the second swing leg respectively have at least one movable leg and a telescopic extension that drives the at least one movable leg to expand and contract The device wherein the last active leg has vertical legs.

The truck crane according to claim 1, wherein the rear frame of the swing center has a dovetail shape, and the first swing leg and the second swing leg are located at a left and right sides of the dovetail shape. On both sides.

The truck crane according to claim 1, wherein the first swinging leg and the second swinging leg are staggered in a height direction of the truck crane.

The truck crane according to claim 1, comprising four axles, and a front leg is provided at a rear portion of the second bridge.

The truck crane according to claim 1, wherein the front leg is a fixed leg or a swing leg.

The vehicle crane according to claim 1 , wherein a portion of each of the swinging legs that overlaps with the frame and a portion of the frame that overlaps with the swinging leg are a box structure, wherein The pivoting shaft of each of the swinging legs and the frame is a hollow shaft.