WO2018076027A1

WO2018076027A1 - Crane supporting structure by utilizing the cargo load

Info

Publication number: WO2018076027A1
Application number: PCT/VN2017/000009
Authority: WO
Inventors: Van Bon DAO
Original assignee: Dao Van Bon
Priority date: 2016-10-17
Filing date: 2017-10-09
Publication date: 2018-04-26

Abstract

The present invention relates to a crane supporting structure by utilizing the cargo load to support the hydraulic cylinder in lifting the crane, which helps reduce the hydraulic oil pressure in the hydraulic cylinder, and save the hydraulic oil during the operation. The crane supporting structure comprises a movable bearer pivotally mounted on the truck floor; a fixed bearer fixed on the truck floor; a cargo lifting winch fixed on the floor; a crane lifting rope for interconnecting the crane, the fixed bearer and the movable bearer to each other; and a cargo lifting rope wound on the cargo lifting winch.

Description

CRANE SUPPORTING STRUCTURE BY UTILIZING THE CARGO LOAD Tecnical Field

The present invention refers to a crane supporting structure, specifically, the crane supporting structure by utilizing the cargo load which can reduce the pressure applying to the lifting cylinder, minimize the horizontal force on the crane and save energy.

Technical Background

Nowaday, in developing countries, particularly in Vietnam, crane struck, which can change the working radius by rope, is widely used to lift heavy load when executing, assembling construction works or loading and unloading cargo. FIG.l shows a traditional crane truck changing the working radius by the rope. The crane truck consists of a control cabinet 2 rotatably jointed to track crawler truck 1, a crane 3 rotatably jointed to the control cabinet 2, a pulley cluster 4 located on the A carrier to form a cargo lifting winch for controlling the crane 3 to be lifted up or lowered down, a cargo lifting rope 5, and a counterweight 6 . The cargo lifting winch is fixed on the control cabinet 2 to control the lifting of the cargo through the cargo lifting rope 5, the counterweight 6 is fixed at the end of the control cabinet 2. The advantages of this crane truck comprise the low cost, easy in operation, fast in lifting speed, and large in loading load. However, during the process of lifting the cargo, the crane lifting rope easy to be broken leading to the collapse of the crane, so there have been a number of occupational accidents involving this type of crane truck. This problem not only causes economic loss but also endangers to operators and people near the crane truck. Furthermore, when the lifting crane rope pulls the crane over a critical height, the crane can be tipped backwards, which can cause economic loss as well as potential fatal danger.

Another type of crane truck being widely used in Vietnam is the crane struck that can change the working radius by hydraulic cylinders. FIG. 2 shows a traditional crane truck changing radius working by hydraulic cylinders. This crane struck comprises a control cabinet 20 rotatably mounted to track crawler truck 10, the crane 30 rotatably mounted to the control cabinet 20, hydraulic cylinders 40 for controlling the crane operation 30, a cargo lifting winch fixed on the control cabinet 20, a lifting load rope 50, and a counterweight 60 fixed on the back end of the control cabinet 20. To lift the crane 30, an oil pump is required to provide a high pressure oil to the hydraulic cylinder 40. This crane struck has a large capacity, simple in operation and can change the crane lifting speed lightly, accurately, and safely for users. In addition, by using the hydraulic cylinders for lifting crane, this crane struck can overcome the problem in crane collapse due to the overload by the safety valve mounted on the hydraulic cylinders. However, the crane is lifted through the hydraulic cylinders due to the high pressure oil generated by the head pump, so it is required a large amount of fuel consumed by the oil pump when working with the large cargo loads. This can lead to crane breaking.

In viewing the drawbacks of the above-mentioned crane trucks, the purpose of the present invention is to provide a crane supporting structure by utilizing the cargo load for reducing the pressure applied to the hydraulic cylinder during the crane operation, thereby the oil pressure of the oil pump is reduced to help save fuel during the crane operation.

Summary of the Invention

In order to achieve the above purpose, the present invention provides a crane supporting structure by utilizing the cargo load, which is equipped on the crane truck and can change the working radius by hydraulic cylinders, comprising: a movable bearer, which is pivotally mounted on the truck floor so that it can rotate around the latch in the reverse direction with respect to the movement of the crane, and comprises a cargo lifting pulley and a first crane lining pulley mounted thereon; a L-shaped fixed bearer fixed on the truck floor behind the movable bearer and comprises second crane lifting pulley mounted thereon; - a cargo lifting winch fixed on the truck floor; a crane lining rope for interconnecting the crane, the L-shaped fixed bearer and the movable bearer to each other so that the movable bearer can be rotated by the lifting motion of the crane; and a cargo lifting rope wound on a cargo lifting pulley and wrapped on the cargo lifting winch, under the effect of the cargo load, the cargo lifting rope pulls the movable bearer forward to support in lifting the crane by the pulling force of the crane lifting rope.

According to the present invention, the crane lifting support structure further comprises a movable load vertical slidably mounted to the struck floor to support the operation of the cargo lifting winch.

According to the present invention, the cargo lifting winch is configured as step structure and comprises a major drum and a minor drum, in which the cargo lifting rope is wound on the major drum and the movable load lifting rope is wound on the minor drum in the reverse direction with respect to the winding direction of the cargo lifting rope.

According to the present invention, the major drum and minor drum of trie cargo lifting winch are provided with a friction clutch to disconnect the connection of the major drum and the minor drum when necessary.

According to embodiment of the present invention, there is plurality of cargo lifting ropes looped through the hooks and the cargo lifting pulleys mounted on the movable bearer.

The crane supporting structure by utilizing the cargo load of the present invention can lift the cargo and the crane simultaneously. Therefore, the hydraulic cylinder plays the role of bearing the weight of the crane only, so it is avoided the wreck the crane during operating.

Brief Description of the Drawings

The invention will be illustrated by the accompanying figures, in which

FIG. 1_.shows a traditional crane truck changing the working radius by the rope;

FIG. 2 shows other crane truck changing the working radius byof the hydraulic cylinder;

FIG. 3 shows the crane supporting structure by utilizing the cargo load according to the present invention;

FIG. 4 shows the crane truck using the crane supporting structure by utilizing the cargo load according to the present invention at farthest reach; and

FIG. 5 shows the crane using the crane supporting structure by utilizing the cargo load according to the presentinvention at the nearest reach. Detailed Description of the Invention

Hereafter, the invention can be understood more clearly by reading the Detailed Description of the Invention with the reference of accompanying drawings. It should be noted that this detailed description is merely used for illustrating the general principles of the invention but not intended to limite the scope of the invention, which is determined by the appended claims.

As shown in FIG. 3, the crane supporting structure of the present invention comprises a movable bearer 500 pivotally mounted on the truck floor, on which a cargo lifting pulley 530 and a first crane lifting pulley 510 are mounted; the L-shaped fixed bearer 600 fixed on the truck floor behind the movable bearer 500, and comprises the second crane lifting pulley 610 mounted on the front surface thereof; a movable load 800 vertical-slidably mounted in the hollow of the bracket 810 fixed on the truck floor; a cargo lifting winch 900 mounted on the truck floor to control the lifting of the cargo and includes a major drum 910 and a minor drum 920; a crane lifting rope 620 for interconnecting the crane, the L-shaped fixed bearer 600 and the movable bearer 500 to each other; a cargo lifting rope 520 wrapped on a cargo lifting pulley 530 and then wound on the major drum 910 of the cargo lifting winch 900; a movable load lifting rope 820 wound on the minor drum 920 of the cargo lifting winch 900,which is connected to the movable load 800, in the reverse direction with respect to the winding direction of the of the cargo lifting rope 520.

According to embodiment of the present invention, the L-shaped fixed bearer 600 is fixed on the truck floor. The movable bearer 500 can be rotated counterclockwise with the rotation direction of the crane to support the hydraulic cylinder in the lifting process thanks to the cargo load through the crane lifting rope 620 fixed to the top of the crane, and fixed bearer 600, and connected to movable bearer 500. Specifically, one end of the crane lifting rope 620 is fixed to the upper end of the crane and the other end is fixed to the fixed support frame 600, in which the crane lifting rope 620 is wrapped around the second crane lifting pulley 610 of the fixed bearer 600 and the first crane lifting pulley 510 of the movable bearer 500. When the hydraulic cylinder lifts the crane to the nearest reach (highest position), the movable bearer 500 turns clockwise forwards, and simultaneously, the cargo lifting rope 520 extends through the rotation center of the movable bearer 500 whereby reduce the angle formed between the cargo lifting rope 520 and ^the crane so that the direction of the resultant force created by the tension of the crane lifting rope 620, the cargo lifting rope 520 and the gravity of the cargo is coincided with the centerline of the crane. In contrast, when the hydraulic cylinder reaches the farthest reach (lowest position), the movable bearer 500 turns counterclockwise backwards, then the cargo lifting rope 520 becomes straight with the crane lifting rope 620 and perpendicular to the movable bearer 500, thereby the angle between the cargo lifting rope 520 and the crane is increased.

To achieve the purpose of keeping the crane in an equilibrium state disregard the mass of the cargo, the crane supporting structure of the invention comprises a plurality of cargo lifting ropes 520 looped through the hooks and the cargo lifting pulleys 530 mounted on the movable bearer 500. By this way, the tension of the cargo lifting rope 520 is balanced between the end connected to the cargo and other end connected to the cargo lifting winch, so the cargo lifting ropes will play a role as the crane lifting rope, and it is not necessary to use any crane lifting winch. When operating, the cargo load generates a balanced tension between the end the cargo lifting rope 520 connected to the cargo and other end connected to the cargo lifting winch, whereby pulls the movable bearer 500 towards, and simultaneously stretch the crane lifting rope 620 to lift the crane up and support the hydraulic cylinder during the lowering the crane.

According to embodiment of the present invention, to disconnect the major drum 910 and the minor drum 920 if needed, the friction clutch (not shown in the figures) is mounted on the cargo lifting winch 900.

In addition, in order to support the rotation of the cargo lifting winch 900, the movable load 800 is slidably mounted in the hollow of the bracket 810 by the movable load lifting rope 820 with one end wound on the minor drum 920 and the other end wrapped on the pulley 812 at the top of the bracket 810 and then connected to movable load 800. ¥hen the cargo lifting rope 520 is wound completely on the major drum 910 of the cargo lifting winch 900, movable load 800 is at the lowest position on the bracket 810, in the contrary, when the cargo lifting rope 520 is unwound mostly, the movable load 800 is at the highest position on the bracket 810. This is achieved because the winding direction of the movable load lifting rope 820 on the minor drum 920 is opposite to that of the cargo lifting rope 520 on the major drum 910, and cargo lifting winch 900 has the step-shaped structure with the diameter of minor drum 920 which is one-third the major drum 910. The movement of the movable load 800 is opposite to the lifting movement of the cargo. It means when the crane truck stretches the cargo lifting rope 520, the movable load 800 will move down along the bracket 810 by the gravity, the movable load lifting rope 820 on the minor drum 920 makes the cargo lifting winch 900 go counter-clockwise, at that time load lift rope 520 will be wound on the major drum 910 to support the engine to drive the cargo lifting winch 900. Therefore, it helps to reduce the energy consumption during operation.

Hereafter, the crane truck uses the crane supporting structure of the present invention will be described in detail by referring FIGS. 4 and 5, in which FIG. 4 shows the crane truck using the crane supporting structure at farthest reach, and FIG. 5 shows the crane using the crane supporting structure at the nearest reach. As shown in the drawings, the crane truck using the crane supporting structure of the present invention comprises a control cabinet 200 rotatably mounted to track crawler truck 100; a crane 300 rotatably mounted to thecontrol cabinet 200, a hydraulic cylinder 400 for lifting the crane 300; a movable bearer 500 pivotally fixed on the truck floor so that they can rotate around the latch; a L-shaped fixed bearer 600 fixed on the truck floor and reinforced by the cross rope on the bearers and truck floor; a movable load 800 slidably mounted in the hollow of bracket 810 fixed on the truck floor; a cargo lifting winch 900 mounted on the truck floor to control the lifting of the cargo; a crane lifting rope 620 for interconnecting the crane 300, the L-shaped fixed bearer 600 and the movable bearer 500 to each other; a cargo lifting rope 520 wound on the cargo lifting winch 900; a movable load lifting rope 820 wound on the cargo lifting winch 900, which is connected to the movable -load 800, in the reverse- direction with respect to the winding direction of the of the cargo lifting rope 520; and a counterweight 700 mounted behind the control cabinet 200.

The cargo lifting winch 900 of the crane supporting structure of the present invention is configured as a step structure consisting of the major drum 910 and the minor drum 920, in which the cargo lifting rope 520 and the movable load lifting rope 820 are respectively wound in reserve direction on the . major drum 910 and the minor drum 920 of the cargo lifting winch 900. In addition, to reinforce the fixed bearer 600, the reinforeced rope is used for fixing the L-shape side of the L-shaped fixed bearer 600 to the truck floor.

According to the invention, to disconnect in case of necessary to wind/unwind the cargo lifting rope 520 on the major drum 910 when the movable load 800 has reached the ends of the bracket 810, a a friction clutch (not shown in the figure) is provided to the cargo lifting winch 900;

As shown in FIG. 4, the crane 300 is in the farthest reach, the crane lifting rope 620 is wrapped around the first crane lifting pulley 510 to pull the movable bearer 500 counterclockwise to the backwards so that the cargo lifting rope 520 is aligned with the crane lifting rope 620 and perpendicular with the movable bearer 500. At this time, the resultant force created by the tensions of the crane lifting rope 620, the cargo lifting rope 520 and the gravity of the cargo is coincided with the centerline of the crane. Also, the movable load 800 is on the highest position on the bracket 810. When the crane 300 is lifted by the hydraulic cylinder 400 from the farthest reach in FIG. 4 to the nearest reach in FIG. 5, the cargo load forms the stretch force on the cargo lifting rope 520 and pulls the movable bearer 500 to move clockwise forward and stretches the load lifting support rope 620 to move backward, then lifts the crane 300 to move up. Thanks to the cargo load, the crane support structure of the present invention supports the hydraulic cylinder 400 when lifting-lowering the crane 300, thereby the pressure formed by oil filled in the hydraulic cylinder 400 is reduced, thus the oil consumption is reduced. Accordingly, the advantage of the crane supporting structure is that the larger the cargo weight is, the more effective the crane supporting structure is achieved, and the better the saving fuel is. In addition, to prevent the possibility of overturning of the crane struck when lifting the crane to the nearest reach, the crane supporting structure of the present invention will remove the pulling force of the crane lifting rope 620. To achieve this purpose, a stopper (not shown in the drawings) is equipped to prevent the rotating of the movable bearer 500 before the crane 300 is on the nearest reach, thereby, when the crane 300 is on the nearest reach, the crane lifting rope 620 becomes sag and can not lift the crane 300 to move up. At that time, the hydraulic cylinder 400 will take responsibility for lifting the crane 300. As shown in FIG. 5, when the crane 300 is in the nearest reach, the cargo lifting rope 520 passes the center of the movable bearer 500. When lifting the load, the cargo lifting winch 900 goes counter-clockwise to wind the cargo lifting rope 520 on the major drum 910. Also, the movable load 800 under its gravity will slide along with the rail in the bracket 810 to pull the movable load lifting rope 820 move up resulting the counter-clockwise rotation of the minor drum 920. The major drum 910 and the minor drum 920 are rotated simultaneously by the friction clutch, therefore the rotationa movement of the minor drum 920 under the action of the movable load 800 will support the engine to drive the cargo lifting winch 900.

The crane supporting structure of the present invention utilize the pulling force of cargo lifting rope to lift the crane. Meanwhile, the direction of the resultant forces at top end of the crane is coincident with the centerline of the crane, i.e. the said resultant force directs to the center of the crane. Further, the twisting force, which can fractures the crane, is very small, so the crane is only compressed and lifted by a hydraulic cylinder, whereby there is no risk of accidents such as broken crane or collapsed crane when lifting the cargo. Therefore, the crane supporting structure of the present invention has achieved the safety, avoiding the risk of accidents due to overloading, breakages of the crane or crane lifting rope resulting the wreck of crane

Although the invention is described through the embodiments as above, the invention is not limited by the these embodiments, but the skilled person in the art can make many changes, modifications or equivalents by reading the description of invention. As described herein, the rotation movement of the movable bearer is equivalent to the movement of the crane via the crane lifting rope, however the invention is not limited there, but, in another embodiment, the rotation movement of the movable bearer can be adjusted either by a hydraulic cylinder or a linkage which connects the crane with the movable bearer through the rocker mechanism so that the rotation of the movable bearer reverses with that of the crane, so the fixed bearer and the crane lifting rope are not omitted. The said changes, modifications or equivalents are considered to be within the scope of the invention as determined by the appended claims.

Claims

1. A crane supporting structure by utilizing the cargo load, comprising:

a movable bearer, which is pivotally mounted on the truck floor so that it can rotate around the latch in the reverse direction with respect to the movement of the crane, and comprises a cargo lifting pulley and a first crane lifting pulley mounted thereon;

a L-shaped fixed bearer fixed on the truck floor behind the movable bearer and comprises second crane lifting pulley mounted thereon;

a cargo lifting winch fixed on the truck floor;

a crane lifting rope for interconnecting the crane, the L-shaped fixed bearer and the movable bearer to each other so that the movable bearer can be rotated by the lifting motion of the crane; and

a cargo lifting rope wrapped on a cargo lifting pulley and wound on the cargo lifting winch, under the effect of the cargo load, the cargo lifting rope pulls the movable bearer forward to support in lifting the crane by the pulling force of the crane lifting rope.

2. The crane supporting structure according to claim 1, further comprising a movable load vertical slidably mounted to the struck floor to support the operation of the cargo lifting winch.

3. The crane supporting structure according to claim 2, wherein the cargo lifting winch is configured as step structure and comprises a major drum and a minor drum, in which the cargo lifting rope is wound on the major drum and the movable load lifting rope is wound on the minor drum in the reverse direction with respect to the winding direction of the cargo lifting rope.

4. The crane supporting structure according to claim 3, wherein the major drum and minor drum of the cargo lifting winch are provided with a friction clutch to disconnect the connection of the major dram and the minor drum.

5. The crane supporting structure according to claim 1, wherein there is plurality of cargo lifting ropes looped through the hooks and the cargo lifting pulleys mounted on the movable bearer.