CN112723191A

CN112723191A - Light crane

Info

Publication number: CN112723191A
Application number: CN202011613783.2A
Authority: CN
Inventors: 方亦全
Original assignee: Guangdong Bozhilin Robot Co Ltd
Current assignee: Guangdong Bozhilin Robot Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-30
Anticipated expiration: 2040-12-30
Also published as: CN112723191B

Abstract

The invention relates to the technical field of construction machinery and discloses a light crane. Wherein, light-duty loop wheel machine includes: a vehicle underframe; the A-shaped frame is vertically arranged on the vehicle underframe and is of a truss structure; one end of the pull rod is connected with the vehicle underframe, and the other end of the pull rod is connected with one end of the A-shaped frame, which is far away from the vehicle underframe; the suspension arm is hinged with the A-shaped frame and is arranged on one side, opposite to the pull rod, of the A-shaped frame and used for lifting a sling; and the winch assembly is used for winding and unwinding the sling. The light crane provided by the invention has higher transverse strength on the premise of smaller overall volume and mass.

Description

Light crane

Technical Field

The invention relates to the technical field of construction machinery, in particular to a light crane.

Background

At present, the roof of a high-rise building has a certain gradient, parapet walls are arranged around the roof, a workpiece needs to be moved into the roof when the hoisting operation is completed on the roof, the gradient of the roof enables hoisting equipment to be subjected to transverse load in a moving mode, and the hoisting working condition is relatively bad.

The small crane on the market at present has insufficient transverse strength during rotation, and is easy to deform and even damage; although the large-scale equipment of lifting by crane can satisfy transverse strength, bulky, weight is heavy, need just can carry the roof with the help of other equipment.

Therefore, a light crane is needed to solve the above technical problems.

Disclosure of Invention

Based on the above, the invention aims to provide a light crane which has high transverse strength on the premise of small overall volume and mass.

In order to achieve the purpose, the invention adopts the following technical scheme:

there is provided a lightweight hoist comprising: a vehicle underframe; the A-shaped frame is vertically arranged on the vehicle underframe and is of a truss structure; one end of the pull rod is connected with the vehicle underframe, and the other end of the pull rod is connected with one end of the A-shaped frame, which is far away from the vehicle underframe; the suspension arm is hinged with the A-shaped frame, is arranged on one side of the A-shaped frame opposite to the pull rod and is used for lifting a sling; and the winch assembly is used for rolling and unreeling the sling.

The light crane is particularly a stable space tetrahedron structure formed by the underframe, the A-shaped frame and the pull rod, the space tetrahedron structure has higher lateral rigidity compared with a common crane frame, can bear larger transverse load under the structural arrangement with smaller volume, and is particularly suitable for the hoisting operation of the roof of a high-rise building. On the other hand, the A-shaped frame adopts a truss structure, so that the overall quality of the light crane is reduced, and the transportation is facilitated.

As an alternative of the light crane, the method further comprises the following steps: and one end of the linear driving part is hinged with the A-shaped frame, the other end of the linear driving part is hinged with the suspension arm, and the linear driving part can drive the suspension arm to rotate relative to the A-shaped frame.

As an alternative to a light crane, the central axis of the linear drive is collinear with the central axis of the drawbar when the boom is rotated to an uppermost position relative to the a-frame.

As an alternative to the light crane, the linear drive employs a servo electric cylinder.

As an alternative of the light crane, the left side and the right side of the vehicle underframe are respectively provided with a counterweight chamber, and the counterweight chambers can accommodate a plurality of counterweights.

As an alternative of the light crane, the bottom of the vehicle chassis is provided with a front wheel set and a rear wheel set, the front wheel set comprises directional wheels, and the rear wheel set comprises universal wheels.

As an alternative of a light crane, the universal wheel is provided with a brake pad, the A-shaped frame is provided with a hand brake assembly, and the hand brake assembly is connected with the brake pad through a brake cable and used for driving the brake pad to press against the universal wheel.

As an alternative to the light crane, the handbrake assembly comprises: the hand brake frame is provided with ratchet teeth; and the handle is rotatably connected with the hand brake frame, the handle is connected with the brake cable, the handle is rotatably connected with a pawl, and the pawl is matched with the ratchet teeth.

As an alternative of the light crane, the crane further comprises a quick-release assembly, and the vehicle underframe and the A-shaped frame are detachably connected through the quick-release assembly, the pull rod and the A-shaped frame, the pull rod and the vehicle underframe, and the suspension arm and the A-shaped frame.

As an alternative to the light crane, the quick release assembly comprises: the first hinge seat is fixed on one of the components connected with the quick-release assembly; the second hinge seat is fixed on the other component connected with the quick-release assembly; and the quick-release pin shaft is rotationally connected with the first hinge seat and the second hinge seat, and a guide section with the taper larger than zero is arranged on the quick-release pin shaft.

The invention has the beneficial effects that:

the light crane provided by the invention forms a stable space tetrahedron structure through the vehicle underframe, the A-shaped frame and the pull rod, the space tetrahedron structure has higher lateral rigidity compared with a common crane frame, can bear larger transverse load under the arrangement of a structure with smaller volume, and is particularly suitable for the hoisting operation of the roof of a high-rise building. On the other hand, the A-shaped frame adopts a truss structure, so that the overall quality of the light crane is reduced, and the transportation is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic structural view of a lightweight crane provided in accordance with the present invention;

FIG. 2 is an enlarged schematic view of area A of FIG. 1;

FIG. 3 is an enlarged schematic view of region B of FIG. 1;

FIG. 4 is a schematic view of a partial structure of a handbrake assembly provided by the present invention;

FIG. 5 is a schematic structural view of a quick release pin according to the present invention;

FIG. 6 is a schematic structural view of a universal wheel provided in accordance with the present invention;

FIG. 7 is a schematic view of the light crane of the present invention in a collapsed position;

FIG. 8 is a schematic view I of the light crane provided by the invention in a state that the boom is in a horizontal position;

FIG. 9 is a schematic view of the light crane provided by the present invention in a state where the boom is in a horizontal position;

FIG. 10 is a schematic view of the light crane provided by the present invention in the uppermost position of the boom;

FIG. 11 is a schematic view of the side of the light crane of the present invention as it would appear against a parapet wall.

In the figure:

100. a floor surface; 200. a parapet wall;

1. a vehicle underframe; 11. a counterweight chamber; 2. a type A frame; 3. a pull rod; 4. a suspension arm; 5. a hoist assembly; 6. a linear drive; 7. a balancing weight; 8. a directional wheel; 9. a universal wheel; 10. a hand brake assembly; 101. a hand brake frame; 1011. ratchet teeth; 102. a handle; 1021. a pawl; 103. mounting a plate; 121. a first hinge mount; 122. a second hinge mount; 123. a pin shaft is quickly disassembled; 1231. a guide section; 13. a brake pad.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-11, the present embodiment provides a light crane for hoisting operation, especially for hoisting operation of the roof of a high-rise building, comprising a chassis 1, an a-frame 2, a pull rod 3, a boom 4 and a winch assembly 5. The A-shaped frame 2 is erected on the vehicle underframe 1, and the A-shaped frame 2 is of a truss structure; one end of the pull rod 3 is connected with the vehicle underframe 1, and the other end of the pull rod is connected with one end of the A-shaped frame 2 far away from the vehicle underframe 1; one end of the suspension arm 4 is hinged with the A-shaped frame 2, and the suspension arm 4 is arranged on one side of the A-shaped frame 2 opposite to the pull rod 3 and used for lifting a sling; the winch assembly 5 is arranged on the vehicle underframe 1 and used for winding and unwinding the sling.

Specifically, the light crane provided by the embodiment forms a stable spatial tetrahedral structure together through the vehicle underframe 1, the a-shaped frame 2 and the pull rod 3, and the spatial tetrahedral structure has higher lateral rigidity compared with a general crane frame, can bear larger transverse load under the structural arrangement with smaller volume, and is particularly suitable for the hoisting operation of the roof of a high-rise building. On the other hand, the A-shaped frame 2 adopts a truss structure, so that the overall quality of the light crane is reduced, and the light crane is convenient to convey.

Specifically, the A-shaped frame 2 is formed by welding steel pipes, the bending section coefficient of the steel pipes is large, a steel structure with a large section is formed by the steel pipes with small sections, so that the transverse bending strength of the light crane is increased, meanwhile, the rear surface of the A-shaped frame 2 is fixed with the vehicle bottom frame 1 through the pull rod 3, the pull rod 3 and the A-shaped frame 2 form the spatial tetrahedral structure, the bottom span is large, the stability is high when the light crane is integrally stressed, the transverse rigidity is high, the deformation is small, and the integral transverse strength of the light crane is further increased; and load pressure can not act on the axial of the compression bar in the A-shaped frame 2 vertically, so that stress softening of the compression bar is avoided, and the phenomenon that the poor stability of the compression bar causes instability and even buckling of the compression bar is avoided.

In a specific application scenario, when the light crane is in the working position as shown in fig. 8 and 9, since the floor 100 of the building generally has a slope of about 2%, the light crane is tilted forward as a whole, the boom 4 is in a horizontal state, the load moment is the largest at this time, and the cantilever structure has an extremely high requirement on the anti-overturning performance of the light crane; when the light crane is at the working position as shown in fig. 11, the light crane is in the lateral most dangerous working condition, the light crane integrally tilts to the right side, the suspension arm 4 is at the highest point, the load moment is minimum at the moment, the forward and backward anti-overturning performance requirement is not high, but the anti-overturning stability requirement of the left and right lateral directions is extremely high; when the light crane is accelerated and decelerated, the load inertia force can continuously impact the light crane, and the requirements on the high rigidity and the high stability of the light crane are also extremely high. For the extreme working condition, the space tetrahedron formed by the A-shaped frame 2 and the pull rod 3 in the truss structure can resist the impact force of loads in different directions in the forward direction and the lateral direction, when the transverse load borne by the light crane is increased, the space tetrahedron formed by the A-shaped frame 2 and the pull rod 3 in the truss structure bears the instantaneous impact force of the load, then the supporting rod of the A-shaped frame 2 and the pull rod 3 transmit the load force to the ground, the decomposition and unloading of the load force are realized, and the high all-directional anti-overturning stability is achieved.

Optionally, the light crane further comprises a linear driving element 6, one end of the linear driving element 6 is hinged to the a-shaped frame 2, the other end of the linear driving element 6 is hinged to the boom 4, and the linear driving element 6 can drive the boom 4 to rotate relative to the a-shaped frame 2.

Preferably, the linear driving element 6 in this embodiment is a servo electric cylinder, which can precisely control the rotation angle of the suspension arm 4 to precisely control the amplitude. In other embodiments of the present invention, the linear driving element 6 may be a hydraulic cylinder, an air cylinder, or the like.

Optionally, as shown in fig. 10, when the boom 4 rotates to the highest position relative to the a-shaped frame 2, the central axis of the linear driving member 6 is collinear with the central axis of the pull rod 3, so that the path of the load force of the linear driving member 6 transmitted to the ground is shortest, the service life of the linear driving member 6 is effectively prolonged, meanwhile, the light crane is ensured to have sufficient obstacle crossing capability at the hoisting height, and the application range of the light crane is widened.

Further, the left and right sides of the vehicle underframe 1 are respectively provided with a counterweight chamber 11, the counterweight chamber 11 can accommodate a plurality of counterweight blocks 7, and the arrangement of the counterweight chamber 11 and the counterweight blocks 7 enables the gravity center position of the light crane to be flexibly adjusted and is always positioned on one side where the light crane is stable. Specifically, since the floor 100 of the building generally has a slope of about 2%, when the light crane is located right opposite to the parapet wall 200 as shown in fig. 8-10, the counterweight blocks 7 in the counterweight chambers 11 on the left and right sides need to be added so that the overall center of gravity of the light crane is as far back as possible to avoid forward overturning; when the light crane is positioned side-to-side with respect to the parapet 200 as shown in fig. 11, it is necessary to increase the weight 7 in the weight chamber 11 on the side away from the parapet 200 and/or decrease the weight 7 in the weight chamber 11 on the side close to the parapet 200 so that the overall center of gravity of the light crane is as far away as possible from the parapet 200 to prevent it from tipping over toward the parapet 200.

Optionally, the bottom of vehicle bottom frame 1 is equipped with preceding wheelset and rear wheel group, and preceding wheelset includes

directional wheel

8, and 8 mainly used bearing of directional wheel, rear wheel group include universal wheel 9, and universal wheel 9 is used for the diversion of light-duty loop wheel machine.

Optionally, as shown in fig. 1, fig. 2 and fig. 6, a brake pad 13 is arranged on the universal wheel 9, a hand brake assembly 10 is arranged on the a-shaped frame 2, the hand brake assembly 10 is connected with the brake pad 13 through a brake cable, and the hand brake assembly 10 is used for driving the brake pad 13 to press against the universal wheel 9 so as to prevent the light crane from shifting during fixed-point hoisting.

Further, as shown in fig. 4, the hand brake assembly 10 includes a mounting plate 103, a hand brake frame 101 and a handle 102, wherein the hand brake frame 101 is mounted on the a-shaped frame 2 through the mounting plate 103, and the mounting height thereof is preferably 1 m to 1.7 m, which is convenient for a user to operate; ratchet teeth 1011 are arranged on the hand brake frame 101; the handle 102 is rotatably connected with the hand brake frame 101, the handle 102 is connected with a brake cable, the handle 102 is rotatably connected with a pawl 1021, and the pawl 1021 is matched with the ratchet teeth 1011. Specifically, when the light crane travels on a slope, the foot brake is inconvenient to use, the speed of the crane can be controlled by the hand brake assembly 10, the speed of the crane can be controlled within a controllable range, and the light crane is prevented from overturning due to too fast speed change of the light crane. In addition, the arrangement of the pawl 1021 and the ratchet teeth 1011 limits the unidirectional rotation of the handle 102, so that the phenomenon that the universal wheel 9 cannot be completely braked is avoided, and potential safety hazards are eliminated.

Optionally, the light crane further comprises a quick-release assembly, and the vehicle underframe 1 and the A-shaped frame 2 are detachably connected, the pull rod 3 and the vehicle underframe 1 are detachably connected, and the suspension arm 4 and the A-shaped frame 2 are detachably connected through the quick-release assembly. In this embodiment, as shown in fig. 3 and fig. 5, the quick release assembly includes a first hinge seat 121, a second hinge seat 122 and a quick release pin 123, the first hinge seat 121 is fixed on one of the components connected to the quick release assembly, the second hinge seat 122 is fixed on the other component connected to the quick release assembly, the quick release pin 123 is rotatably connected to the first hinge seat 121 and the second hinge seat 122, and a guide section 1231 with a taper larger than zero is provided on the quick release pin 123, the first hinge seat 121 and the second hinge seat 122 can be aligned along the guide section 1231 during the assembly process, so that the revolute pair is automatically centered.

Preferably, the vehicle underframe 1 and the suspension arm 4 are both made of steel pipes, the overall quality of the light crane is lower through the hollowing design, the carrying and the assembling can be realized by one person, and the use convenience of the light crane is improved. As shown in fig. 7, after the components of the light crane are disassembled, the chassis 1 can completely accommodate and fix other components of the light crane, so that the light crane can be conveniently and rapidly transferred completely, and the convenience of transfer is improved.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A light crane, comprising:

a vehicle underframe;

the A-shaped frame is vertically arranged on the vehicle underframe and is of a truss structure;

one end of the pull rod is connected with the vehicle underframe, and the other end of the pull rod is connected with one end of the A-shaped frame, which is far away from the vehicle underframe;

the suspension arm is hinged with the A-shaped frame, is arranged on one side of the A-shaped frame opposite to the pull rod and is used for lifting a sling; and

and the winch assembly is used for rolling and unreeling the sling.

2. The light weight crane of claim 1, further comprising:

and one end of the linear driving part is hinged with the A-shaped frame, the other end of the linear driving part is hinged with the suspension arm, and the linear driving part can drive the suspension arm to rotate relative to the A-shaped frame.

3. The light weight crane of claim 2, wherein the central axis of the linear drive is collinear with the central axis of the drawbar when the boom is rotated to an uppermost position relative to the a-frame.

4. The lightweight crane according to claim 2, wherein said linear drive is a servo electric cylinder.

5. The light crane according to claim 1, wherein the left and right sides of the chassis are respectively provided with a counterweight chamber, and the counterweight chambers can accommodate a plurality of counterweights.

6. The light crane according to claim 1, wherein the bottom of the chassis is provided with a front wheel set and a rear wheel set, the front wheel set comprises a directional wheel, and the rear wheel set comprises a universal wheel.

7. The light crane according to claim 6, wherein a brake pad is arranged on the universal wheel, a hand brake assembly is arranged on the A-shaped frame, and the hand brake assembly is connected with the brake pad through a brake cable and used for driving the brake pad to press against the universal wheel.

8. The light crane of claim 7, wherein the handbrake assembly comprises:

the hand brake frame is provided with ratchet teeth; and

the handle, with manual brake frame rotates to be connected, the handle with the brake cable is connected, it is connected with the pawl to rotate on the handle, the pawl with ratchet tooth cooperation sets up.

9. The light crane according to any one of claims 1 to 8, further comprising a quick release assembly, wherein the vehicle chassis is detachably connected with the A-shaped frame, the pull rod is detachably connected with the vehicle chassis, and the suspension arm is detachably connected with the A-shaped frame through the quick release assembly.

10. The lightweight hoist of claim 9, wherein the quick release assembly includes:

the first hinge seat is fixed on one of the components connected with the quick-release assembly;

the second hinge seat is fixed on the other component connected with the quick-release assembly; and

the quick-release pin shaft is rotatably connected to the first hinge seat and the second hinge seat, and a guide section with the taper larger than zero is arranged on the quick-release pin shaft.