CN213037302U

CN213037302U - Dismounting device for vertical supporting leg of crane

Info

Publication number: CN213037302U
Application number: CN202021791579.5U
Authority: CN
Inventors: 陈珊; 杜文正; 强宝民; 侯祯伟; 马俊春; 蔡艺虹
Original assignee: Rocket Force University of Engineering of PLA
Current assignee: Rocket Force University of Engineering of PLA
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-04-23
Anticipated expiration: 2030-08-24

Abstract

The utility model provides a dismounting device for vertical supporting legs of a crane, which comprises a movable travelling mechanism, wherein the movable travelling mechanism comprises an L-shaped frame with a flat structure, and universal casters are arranged at the bottom of the frame; the frame is provided with: the erecting mechanism is used for converting the vertical state and the horizontal state of the vertical supporting leg; and a lifting mechanism for lifting or lowering the vertical support leg; this device accomplishes simple structure, operation convenient to use, convenient maintenance on satisfying the basis that can accomplish perpendicular landing leg dismouting work.

Description

Dismounting device for vertical supporting leg of crane

Technical Field

The utility model belongs to hoist assembly field, concretely relates to perpendicular landing leg dismounting device of hoist.

Background

The truck crane belongs to heavy truck crane large-scale machinery, and is suitable for the hoisting and transferring work of large-scale objects with large mass, special appearance or high precision requirement. At present, most of automobile cranes at home and abroad use an electromechanical-hydraulic integrated system, the automobile cranes in China use a PLC programmable integrated control technology in a large quantity, control and execution elements such as a hydraulic valve block with a bus interface, a hydraulic motor, an oil pump and the like are mature, and hydraulic pressure and electric appliances are tightly combined. The control performance can be adjusted through software, the control system is greatly simplified, hydraulic elements are reduced, the stability of the system is improved, and the automatic fault diagnosis and remote control capabilities are realized.

The automobile crane mainly comprises a lifting arm, an amplitude variation arm, a rotation arm and an automobile chassis. In recent years, the development of automobile cranes has been promoted due to the development of the electronic industry, hydraulic technology, automobile industry and high-strength steel in China. Self-heavy, mechanically driven mobile cranes with long work preparation times have been replaced by hydraulic mobile cranes. The hydraulic system of the hydraulic automobile crane adopts a hydraulic pump and a quantitative or variable motor to realize the independent or combined action of the lifting rotation, the amplitude variation, the boom extension and the landing leg extension of the crane.

Because the system and the mechanism of the automobile crane are relatively complex relative to users, the maintenance of the automobile crane at present mainly carries out the replacement of parts by returning to a factory. However, when the truck crane is in a special working environment or under a condition that the opportunity is tense, the maintenance requirements of users are difficult to meet by returning to the factory for maintenance, and the performance of tasks is affected. Therefore, many users back up the frequently damaged parts of the automobile cranes according to the conditions of the users, and the automobile cranes are subjected to fault detection and maintenance according to the users.

The automobile crane is divided into the following parts according to the supporting leg type: x-shaped supporting legs, frog-type supporting legs and H-shaped supporting legs. Wherein the frog leg has smaller span and is only suitable for cranes with smaller tonnage; the X-shaped supporting leg is easy to slide and is rarely adopted; the H-shaped supporting legs can realize larger span, and have obvious superiority to the stability of the whole machine, so the hydraulic automobile crane produced in China mostly adopts the H-shaped supporting legs. At present, when the H-shaped supporting leg is maintained, the whole vertical supporting leg needs to be detached from the horizontal oil cylinder, and then the supporting leg is maintained or replaced by parts.

Because the vertical supporting leg is special in installation position, large in mass and capable of bearing load without manpower, the vertical supporting leg needs to be detached and installed by a hydraulic forklift in cooperation with a trench and a bridge crane. In the dismouting in-process, the instrument variety of use is many, and the flow is loaded down with trivial details, wastes time and energy, and many potential safety hazards in addition have all caused certain threat to personnel and equipment.

Disclosure of Invention

An object of the utility model is to provide a perpendicular landing leg dismounting device of hoist has solved current H type landing leg and has had many potential safety hazards at maintenance dismouting in-process, has all caused certain threat to personnel and equipment.

In order to achieve the above purpose, the utility model discloses a technical scheme is:

the utility model provides a dismounting device for vertical supporting legs of a crane, which comprises a movable travelling mechanism, wherein the movable travelling mechanism comprises an L-shaped frame with a flat structure, and universal casters are arranged at the bottom of the frame; the frame is provided with:

the erecting mechanism is used for converting the vertical state and the horizontal state of the vertical supporting leg;

and a lifting mechanism for lifting or lowering the vertical support leg.

Preferably, the erecting mechanism comprises an erecting hydraulic cylinder and a receiving box, wherein a fixing part of the erecting hydraulic cylinder is installed on a vertical plate of an L-shaped structure of the frame; the end part of an output shaft of the erecting hydraulic cylinder is fixed on the bearing box; the bearing box is arranged on a horizontal plate of the frame and is rotationally connected with the frame;

the bearing box is of a cuboid structure, and an installation groove for placing a vertical supporting leg is formed in the upper end face of the cuboid structure;

hoisting mechanism places the one end at the mounting groove, and can follow the axis round trip movement of mounting groove.

Preferably, a threaded hole is formed in one end, close to the hoisting mechanism, of the receiving box, and the axis of the threaded hole is perpendicular to the axis of the vertical supporting leg; and a limit pin is assembled in the threaded hole.

Preferably, the other end of the bearing box mounting groove is further provided with a limiting block, a limiting hole is formed in the limiting block, and the connecting end of the vertical supporting leg is assembled in the limiting hole.

Preferably, the lifting mechanism comprises a lifting base, a lifting hydraulic cylinder and a movable pulley, wherein the lifting base is of a ball-and-socket structure, and the ball-and-socket structure is in contact with a grounding end of the vertical supporting leg; the lifting base is placed in a mounting groove of the receiving box of the erecting mechanism; the lifting hydraulic cylinder is arranged on the frame; a movable pulley is fixed on an output shaft of the lifting hydraulic cylinder; meanwhile, a fixed pulley is arranged on the lifting hydraulic cylinder; and a steel wire rope is wound on the fixed pulley, and the free end of the steel wire rope is fixed on the side wall of the lifting base through the movable pulley.

Preferably, four rib plates are arranged on the outer side wall of the lifting base along the circumferential direction of the lifting base, and are mounted on a base plate of the L-shaped lifting arm structure through the rib plates; the L-shaped lifting arm structure is placed in a mounting groove on the bearing box; the lifting arm structure is characterized in that connecting pieces of bending structures are arranged on two sides of the free end of a vertical plate of the lifting arm structure, a first shaft hole and a second shaft hole are formed in two ends of each connecting piece respectively, pulleys are mounted in the first shaft hole and the second shaft hole, and the pulleys are matched with sliding rails on a mounting groove in the bearing box.

Preferably, the lifting mechanism further comprises a hydraulic system, and the hydraulic system is respectively connected with the lifting hydraulic cylinder of the lifting mechanism and the lifting hydraulic cylinder of the lifting mechanism through a manual reversing valve.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a pair of perpendicular landing leg dismounting device of hoist, the device mainly used is to the dismantlement work of perpendicular landing leg when the perpendicular landing leg of mobile crane maintains maintenance or maintenance change, and the main problem that has the safety risk in order to solve the current dismantlement flow in that the instrument is numerous, the flow is complicated, exists, this device accomplishes simple structure satisfying on the basis that can accomplish perpendicular landing leg dismouting work, operation convenient to use, convenient maintenance.

Furthermore, a power system of the device uses a manually operated hydraulic system to solve the problem of large mass of the vertical supporting leg and get rid of the dependence on power supply.

Drawings

Fig. 1 is a front view of a detaching device according to the present invention;

fig. 2 is a plan view of the detaching device according to the present invention;

fig. 3 is a left side view of the detaching device according to the present invention;

fig. 4 is a front view of a frame according to the present invention;

fig. 5 is a perspective view of a vehicle frame according to the present invention;

FIG. 6 is a schematic view of the working principle of the frame and the erecting mechanism according to the present invention;

fig. 7 is a schematic view of a hoisting mechanism according to the present invention;

fig. 8 is a schematic structural view of a lifting base according to the present invention;

fig. 9 is a schematic view of a limiting device of a erecting mechanism according to the present invention;

the lifting device comprises a frame 1, a frame 101, a handrail 102, an open slot 103, a mounting part 2, a reinforcing rib 3, a lifting hydraulic cylinder 4, a rotary bearing 5, a rotary shaft 6, a pulley 7, a universal caster 8, a fixed pulley 9, a steel wire rope 10, a vertical supporting leg 11, a lifting arm structure 12, a fixing part 13, a limiting pin 14, a lifting base 15, a ribbed plate 16, a mounting hole 17, a first shaft hole 18, a second shaft hole 19, a limiting block 20, a bearing box 21, a movable pulley 22, a lifting hydraulic cylinder 23, a pulley shaft 24 and a pulley bearing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in the figure, the utility model provides a pair of perpendicular landing leg dismounting device of hoist for the dismantlement work to perpendicular landing leg when the perpendicular landing leg of mobile crane maintains maintenance or maintenance change.

The lifting device comprises a mobile travelling mechanism, a erecting mechanism, a lifting mechanism, a working state switching mechanism and a supporting leg limiting mechanism, wherein the mobile travelling mechanism is used for driving the whole device to move and travel; the erecting mechanism is used for converting the vertical state and the horizontal state of the supporting leg; the lifting mechanism is used for lifting or descending the supporting legs; the working state switching mechanism is used for switching the lifting state and the erecting state of the supporting leg; the supporting leg limiting mechanism is used for limiting the vertical supporting leg to move in the bearing box.

As shown in fig. 4, the mobile walking mechanism comprises a frame 1, and universal casters 7 are mounted at the bottom of the frame 1; the frame 1 is also provided with a handrail 101.

The frame 1 is of an L-shaped flat plate structure; and reinforcing ribs 2 are arranged between the horizontal bottom plate and the vertical plate.

The top of the vertical plate is provided with a mounting part 103, the mounting part 103 is provided with a through hole, a rotating shaft 5 is assembled in the through hole, and the rotating shaft 5 is sleeved with a rotating bearing 4.

The erecting mechanism comprises an erecting hydraulic cylinder 3 and a receiving box 20, wherein a fixing part of the erecting hydraulic cylinder 3 is sleeved on the rotary bearing 4; the end part of the output shaft of the erecting hydraulic cylinder 3 is fixed on the bearing box 20.

The bearing box 20 is of a cuboid structure, and an installation groove for placing a vertical supporting leg is formed in the upper end face of the cuboid structure; the opening direction of the mounting groove is arranged along the moving direction of the frame 1.

The receiving box 20 is installed in an opening groove 102 formed in the frame 1, and is rotatably connected with the frame 1.

The bearing box 20 is provided with a mounting hole, a rotating shaft is arranged in the mounting hole, and two ends of the rotating shaft are arranged on the frame 1; bearings are respectively installed on two side walls of the open groove 102, and two ends of the rotating shaft are respectively connected with the two bearings, so that the bearing box 20 can rotate.

When the vertical state of the vertical support leg is converted into the horizontal state, the vertical support leg is firstly placed in a mounting groove on the bearing box 20; then, pulling the receiving box 20 by the pulling force provided by the erecting hydraulic cylinder 3; thereby realizing the transformation of the position relation of the vertical supporting legs;

when the state of the vertical supporting leg is restored, the work of the vertical hydraulic cylinder 3 is stopped, and the horizontal state of the vertical supporting leg is converted into the vertical state through the gravity of the bearing box and the vertical supporting leg.

The vertical supporting leg of the automobile crane is arranged on the horizontal oil cylinder, and the supporting leg is required to be lowered below the horizontal oil cylinder to be moved out during disassembly. Similarly, the vertical support leg needs to be lifted to the installation position of the horizontal oil cylinder when being installed.

The lateral wall of the mounting groove of the receiving box 20 is provided with a slide rail, and the hoisting mechanism is mounted on the slide rail and moves back and forth along the slide rail.

The lifting mechanism comprises a lifting base 14, a lifting hydraulic cylinder 22 and a movable pulley 21, wherein the lifting base 14 is of a ball-and-socket structure, four rib plates 15 are arranged on the side wall of the ball-and-socket structure along the circumferential direction of the ball-and-socket structure, and the lifting mechanism is arranged on a bottom plate of an L-shaped lifting arm structure 11 through the rib plates 15; the L-shaped lifting arm structure 11 is placed in a mounting groove on the carrying box 20.

And a mounting hole 16 is formed in the middle of the free end of the vertical plate of the lifting arm structure 11.

The two sides of the free end of the vertical plate of the lifting arm structure 11 are both provided with a connecting piece 12 with a bending structure, the two ends of the connecting piece 12 are respectively provided with a first shaft hole 17 and a second shaft hole 18, wherein the two first shaft holes 17 are coaxially arranged; the two second shaft holes 18 are arranged coaxially.

Pulleys 6 are installed in the first shaft hole 17 and the second shaft hole 18, and the pulleys 6 are matched with sliding rails on installation grooves in the bearing box 20 to realize the back-and-forth movement of the lifting base 14.

The grounding end part of the vertical leg is placed in the bowl-shaped structure; the lifting base 14 and the vertical leg are coaxially arranged.

The lifting hydraulic cylinder 22 is arranged on the frame 1; a movable pulley 21 is fixed on an output shaft of the lifting hydraulic cylinder 22; meanwhile, a fixed pulley 8 is arranged on the lifting hydraulic cylinder 22, and an included angle is formed between the axis of the movable pulley 21 and the axis of the fixed pulley 8.

The fixed pulley 8 is wound with a steel wire rope 9, and the free end of the steel wire rope 9 is fixed on the side wall of the lifting base 14 through the movable pulley 21 and the mounting hole 16 so as to drive the lifting base 14 and the vertical supporting leg to ascend or descend.

The working state switching mechanism comprises a hydraulic system, wherein a hand pump is arranged on the hydraulic system and used for providing driving force for the hydraulic system.

The hydraulic system is respectively connected with the erecting hydraulic cylinder 3 and the lifting hydraulic cylinder 22 through manual reversing valves, and oil paths are provided for different hydraulic cylinders.

The supporting leg limiting mechanism comprises a limiting block 19 and a limiting pin 13, wherein a threaded hole is formed in the side wall of the receiving box 20, and the axis of the threaded hole is perpendicular to the axis of the vertical supporting leg.

The threaded hole is provided at an end adjacent to the lifting base 14.

The threaded holes are internally provided with limiting pins 13, the connection between the bearing box 20 and the flange plate on the vertical supporting leg is realized through the limiting pins 13, and further the axial movement of the vertical supporting leg is limited.

The bearing box 20 is also provided with a limiting block 19, a limiting hole is formed in the limiting block, and the connecting end of the vertical supporting leg is assembled in the limiting hole; the vertical support leg is used for limiting radial movement and circumferential movement after the vertical support leg is changed from the vertical state to the horizontal state.

The working process is as follows:

step 1, parking the automobile crane beside a trench, wherein a supporting leg of the automobile crane is required to be arranged above the trench, and the distance between the projection of the center of the supporting leg on the surface of the trench and any side of the trench meets the following requirements: l is 410 +/-129 mm;

step 2, detaching the oil-through bolt and the fixing bolt of the hydraulic lock, and detaching the hydraulic lock;

step 3, pushing the trolley to the position right below the vertical supporting leg, operating a shifting lever of the manual reversing valve to the left position of the reversing valve (pushing the shifting lever inwards) to confirm that the lifting stop valve is in a closed state, shaking an operating lever of the hand-operated pump to enable a bearing cylinder of the working device to rotate upwards, enabling the bearing cylinder to have an obvious gap with a stop lever below the working device, and drawing out the stop lever; properly opening the vertical stop valve to slowly rotate the bearing box to a vertical state, and pulling out the limit pin;

and 4, moving the working device to enable the bearing cylinder to be aligned with the vertical supporting leg in the vertical direction, wherein the frame of the working device is parallel to two sides of the trench. After the position is adjusted, the universal joint brake pads of the four trundles are stepped down;

step 5, closing the vertical stop valve, moving a shifting rod of the manual reversing valve to the right position of the reversing valve (pulling the shifting rod outwards), and shaking the operating rod of the hand pump to enable the lifting base 14 to ascend to be completely contacted with the lower part of the vertical supporting leg;

step 6, detaching the connecting bolts of the vertical supporting legs and the horizontal oil cylinder, properly opening the lifting stop valve to enable the vertical supporting legs and the lifting base 14 to slowly fall into the bearing cylinder, placing a limiting block in the containing process, and inserting a limiting pin at the upper end of the bearing cylinder after the vertical supporting legs fall into the bearing cylinder;

step 7, closing the lifting stop valve, moving a shift lever of the manual reversing valve to the left position of the reversing valve (pushing the shift lever inwards), shaking the hand-operated pump to enable the receiving cylinder to be leveled back to a position where a stop lever below the working device can be inserted, inserting the stop lever, opening the vertical stop valve to enable the receiving cylinder to be in contact with the stop lever, and closing the vertical stop valve;

step 8, loosening universal joint brake pads of the trundles, pushing the trolley to a test area, braking the trolley, removing the limit pin, moving a shift lever of the manual reversing valve to the right position of the reversing valve (pulling the shift lever outwards), shaking the hand-operated pump to push out the supporting legs by the lifting hydraulic cylinder, matching the lifting hydraulic cylinder with the lifting hydraulic cylinder by using the truss crane, and placing the vertical supporting legs in the test area;

and 9, opening the lifting stop valve, pushing the lifting base back into the bearing cylinder, closing the lifting stop valve, and shifting the reversing valve shift lever back to the middle position.

The installation process of the supporting legs is the reverse process of the above process.

Claims

1. A vertical supporting leg dismounting device of a crane is characterized by comprising a mobile travelling mechanism, wherein the mobile travelling mechanism comprises an L-shaped frame (1) with a flat plate structure, and universal casters (7) are mounted at the bottom of the frame (1); the frame (1) is provided with:

and a lifting mechanism for lifting or lowering the vertical support leg.

2. The dismounting device of the vertical supporting leg of the crane as claimed in claim 1, characterized in that the erecting mechanism comprises an erecting hydraulic cylinder (3) and a receiving box (20), wherein the fixed part of the erecting hydraulic cylinder (3) is mounted on the vertical plate of the L-shaped structure of the frame (1); the end part of an output shaft of the vertical hydraulic cylinder (3) is fixed on the bearing box (20); the bearing box (20) is arranged on a horizontal plate of the frame (1) and is rotationally connected with the frame;

the bearing box (20) is of a cuboid structure, and an installation groove for placing a vertical supporting leg is formed in the upper end face of the cuboid structure;

3. The dismounting device for the vertical supporting leg of the crane as claimed in claim 2, wherein a threaded hole is formed in one end of the receiving box (20) close to the hoisting mechanism, and the axis of the threaded hole is perpendicular to the axis of the vertical supporting leg; and a limit pin (13) is assembled in the threaded hole.

4. The dismounting device for the vertical support leg of the crane as claimed in claim 2, wherein a limiting block (19) is further arranged at the other end of the mounting groove of the bearing box (20), a limiting hole is formed in the limiting block, and the connecting end of the vertical support leg is assembled in the limiting hole.

5. The dismounting device for the vertical leg of the crane is characterized in that the hoisting mechanism comprises a hoisting base (14), a hoisting hydraulic cylinder (22) and a movable pulley (21), wherein the hoisting base (14) is of a ball-and-socket structure, and the ball-and-socket structure is in contact with the grounding end of the vertical leg; the lifting base (14) is placed in a mounting groove of a vertical mechanism receiving box (20); the lifting hydraulic cylinder (22) is arranged on the frame (1); a movable pulley (21) is fixed on an output shaft of the lifting hydraulic cylinder (22); meanwhile, a fixed pulley (8) is arranged on the lifting hydraulic cylinder (22); and a steel wire rope (9) is wound on the fixed pulley (8), and the free end of the steel wire rope (9) is fixed on the side wall of the lifting base (14) through a movable pulley (21).

6. A dismounting device for a vertical leg of a crane according to claim 5, characterized in that four ribs (15) are provided on the outer side wall of the lifting base (14) along the circumferential direction thereof, and are mounted on the bottom plate of the L-shaped lifting arm structure (11) through the ribs (15); the L-shaped lifting arm structure (11) is placed in a mounting groove in the receiving box (20); the free end both sides of the vertical board that rises arm structure (11) all are provided with connecting piece (12) of structure of buckling, first shaft hole (17) and second shaft hole (18) have been seted up respectively at the both ends of connecting piece (12), all install pulley (6) in first shaft hole (17) and second shaft hole (18), pulley (6) with slide rail on the mounting groove on the bearing box (20) cooperatees.

7. The dismounting device for the vertical support leg of the crane as claimed in claim 1, further comprising a hydraulic system, wherein the hydraulic system is respectively connected with the erecting hydraulic cylinder (3) of the erecting mechanism and the lifting hydraulic cylinder (22) of the lifting mechanism through a manual reversing valve.