CN205275062U - A mobile crane with a double rope grab - Google Patents

Abstract

The utility model discloses a mobile crane with double-rope grab bucket, which comprises an underframe, a rotary platform, a crane boom, an A-bracket, a hoisting mechanism, an amplitude-changing mechanism and a grab bucket, wherein the hoisting mechanism comprises two sets of hoisting devices, each hoisting device comprises a hoisting motor, a hoisting brake and a hoisting winch, and steel wire ropes in the two sets of hoisting devices are respectively connected with a supporting rope and a closing rope of the grab bucket; the amplitude-changing mechanism comprises an amplitude-changing winch, an amplitude-changing brake and an amplitude-changing motor, the propeller strut and the amplitude-changing winch are connected with the crane boom through an amplitude-changing fixed pulley block and an amplitude-changing movable pulley block, the crane can adopt double-rope grab bucket operation, an automatic following rope pressing device arranged on the lifting winch and a steel wire rope on the lifting winch adopt a single-layer winding mode, the phenomenon that the steel wire rope is loosened and disordered in the grab bucket operation can be avoided, the volume of the winch is reduced by the built-in speed reducer of the lifting winch and the amplitude-changing winch, and meanwhile, the amplitude-changing mechanism has the advantages of being.

Description

A mobile crane with a double rope grab

technical field

The utility model belongs to the technical field of cranes, in particular to a mobile crane with a double-cable grab bucket.

Background technique

At present, the stacking operation of bulk cargo in the rear freight yards of many small and medium-sized ports in China is basically completed by the cooperation of many engineering excavators and loaders. The machine consumes high energy, produces large waste gas pollution, high noise, high labor intensity of workers, and high equipment investment cost, so there is an urgent need for a mobile bulk cargo stacking equipment; as a professional lifting equipment, mobile cranes are mainly used for The hoisting operation of bulk cargo, for the loading and unloading of bulk cargo, currently mainly uses cranes with single-cable grabs, hydraulic grabs or electric grabs, which are characterized by low operating efficiency and cannot meet the normal operating efficiency requirements; in this context At present, people try to use double-rope grabs on mobile cranes to improve the efficiency of bulk cargo operations; due to the limitation of the installation space of mobile cranes, it is very difficult in practical applications. Most of the winches are hoisted with multi-layer winding steel wire ropes. In the actual grab operation, the wire ropes are very loose and messy, which makes the grab bucket unable to work normally; moreover, the winch has a large volume and occupies a large space, so that The overall volume is large and the weight is heavy, which affects the mobility and flexibility of the crane.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a mobile crane with a double-cable grab. The steel wire rope adopts a single-layer winding method, which can avoid the phenomenon of loose and disordered wire rope during the grab operation. The hoisting hoist and luffing hoist adopt the structure of a built-in planetary gear reducer, thereby reducing the volume of the hoist. At the same time, it has the advantages of simple structure and high braking safety.

A mobile crane with a double-rope grab, including a chassis, a slewing platform mounted on the chassis, a boom mounted on the slewing platform, a gable frame, a lifting mechanism, a luffing mechanism and The grab bucket of the cargo, and the pull arm rope used to connect the gable and the boom, the lifting mechanism includes two sets of lifting winches with the same structure and independent of each other, each set of lifting winches includes a lifting hoisting motor, hoisting brake and hoisting winch, and the steel wire rope of one set of hoisting winches in the two sets of hoisting winches is connected with the support rope of the grab bucket, and the steel wire rope of the other set of hoisting winch is connected with the The closing rope of the grab is connected; the luffing mechanism includes a luffing winch, a luffing brake and a luffing motor; The luffing fixed pulley block is installed on the herringbone frame, and the steel wire rope on the luffing winch bypasses the luffing fixed pulley block and the luffing movable pulley block in turn.

Preferably, the hoisting hoist includes a hoisting drum with a steel wire rope wound on its outer surface, a built-in hoisting reducer, a hoisting hoisting bracket, a hoisting half shaft, and a hoisting drum fixed on the hoisting hoisting bracket. The hoisting bearing seat, the input end housing of the hoisting reducer is fixed on the hoisting bracket, the output end housing of the hoisting reducer is fixed inside the hoisting drum, and the front flange of the lifting half shaft is connected to the hoisting bracket. The rear end of the hoisting drum is connected, and the rear end of the hoisting half shaft is set in the hoisting bearing seat; the luffing hoist includes a luffing drum with a steel wire rope wound on the outer surface, a built-in luffing reducer, and a luffing reel The hoist bracket, the luffing half shaft and the luffing bearing seat fixed at the rear end of the luffing reel, the input end shell of the luffing reducer is fixed on the luffing winch support, the output end shell of the luffing reducer is fixed on Inside the luffing reel, the front end of the luffing half shaft is sleeved in the luffing bearing seat, and the rear end of the luffing half shaft is fixed on the luffing winch support.

Preferably, the hoisting hoisting steel wire rope is wound on the outer surface of the hoisting drum in a single layer, and the luffing hoisting steel wire rope is wound on the outer surface of the luffing drum in multiple layers.

Preferably, the first lifting hoist/the second hoisting hoist is provided with a rope pressing device for automatically following and pressing the steel wire rope.

Preferably, the hoisting hoist bracket includes a spring seat and ear plates located at both ends of the hoist hoist bracket, and the two ear plates are provided with corresponding hinge holes and hinge shafts fixed in the hinge holes; The rope pressing device includes a rope pressing bracket rotatably connected to the hinge shaft, a pressing wheel shaft, a pressing wheel sliding along the pressing wheel shaft, a slider and an adjustment mechanism. The adjustment mechanism includes a screw rod and a compression spring sleeved on the screw rod. The upper end of the rope pressing bracket A pinch wheel shaft, a slide and a pinch wheel are installed, the lower end of the pinch rope support is tensioned on the spring seat by a screw rod, and the pinch wheel is sleeved on the pinch wheel shaft by the slide piece.

Preferably, the outer surface of the pressure roller is provided with adjacent wire rope guide grooves and wire rope positioning grooves.

Preferably, the boom is provided with a front-pull flexible anti-falling device for preventing the boom from toppling over and a grab stabilizer for preventing the grab from rotating.

Preferably, the grab stabilizer includes a steel wire rope, a fixed pulley, a sliding trolley, a movable pulley fixed on the sliding trolley, a track frame fixed on the boom and at least one guide pulley, and the fixed pulley is fixed at one end of the track frame , the two ends of the wire rope are respectively fixed on the boom and the grab bucket and go around the fixed pulley block on the track frame, the movable pulley block and the guide pulley on the sliding trolley in turn.

Preferably, a buffer block for buffering the sliding trolley is also fixed on the rail frame, and the buffer block is fixed on the other end of the rail frame and corresponds to the fixed pulley block.

Preferably, the flexible anti-falling device is a flexible steel wire rope, one end of which is hinged at the root of the boom, and the other end is hinged at the anti-falling ear seat of the boom.

Preferably, the hoisting hoist bracket of the hoisting hoist is provided with a hoisting height limiter, the luffing motor\the hoisting motor is provided with an encoder; the hoisting brake is two single brake, the luffing brake is a double brake.

Two sets of mutually independent hoisting hoisting devices set in the hoisting mechanism of a mobile crane with double-cable grabs in the utility model can act independently or in combination to realize grab operation and hook operation function, the herringbone frame and the luffing hoist are connected to the boom through the luffing fixed pulley block and the luffing movable pulley block to realize the function of increasing and decreasing amplitude; the lifting hoist and luffing hoist adopt built-in The structural form of the type planetary gear reducer reduces the installation space occupied by the hoist and solves the problem of tight space layout of the mobile crane; Slack and disordered wire ropes during rope grab operations; the traditional anti-fall strut structure is extremely easy to damage and difficult to repair. The use of flexible anti-fall devices can prevent the entire The machine tilts backwards; the grab stabilizer with simple structure can effectively prevent the grab from rotating during operation; the hoisting winch is equipped with a lifting height limiter, which can control the maximum lifting height of the cargo and prevent the cargo from being in the limit position. When the spreader collides with the jib and causes a major safety accident of machine damage and cargo damage; the encoder set by the hoisting motor is used to control the synchronization of the double hoisting winch during the hook operation and the opening and closing of the bucket and the rope chasing process during the grab operation , the encoder set on the luffing motor is used to control the deceleration and stop of the boom before the maximum amplitude and minimum amplitude and limit position.

Description of drawings

Fig. 1 is a structural schematic diagram of a mobile crane with a double-cable grab of the utility model;

Fig. 2 is a top view of the slewing platform of a mobile crane with a double-cable grab in the utility model;

Fig. 3 is a front view of a grab stabilizer of a mobile crane with a double-cable grab according to the present invention;

Fig. 4 is a structural schematic diagram of a hoisting mechanism of a mobile crane with a double-cable grab bucket in the present invention;

Fig. 5 is a schematic structural view of a luffing mechanism of a mobile crane with a double-cable grab bucket in the present invention;

Fig. 6 is a left view of the rope pressing device of a mobile crane with a double-cable grab bucket in the present invention;

Fig. 7 is a front view of a rope-pressing device of a mobile crane with a double-cable grab according to the present invention.

detailed description

Below in conjunction with accompanying drawing, the application scheme is further described:

As shown in Figures 1 to 7, a mobile crane with a double-rope grab in this embodiment includes an underframe 1, a slewing platform 2 installed on the underframe 1, and a lifting platform installed on the slewing platform 2. The boom 3, the gable frame 4, the hoisting mechanism 5, the luffing mechanism 6, the grab bucket 7 for loading and unloading goods, and the pull arm rope 13 for connecting the gable frame 4 and the jib 3, the hoisting mechanism 5 includes two sets of independent hoisting hoisting devices, each set of hoisting hoisting devices includes a hoisting motor 53 connected in sequence, a hoisting coupling 54 with a brake wheel, and a hoisting hoist 51 and a set of The hoisting brake 52 on the hoisting coupling 54 with brake wheels, these two sets of mutually independent hoisting hoisting devices can act independently or in combination to realize the functions of grab operation and hook operation; The wire rope 511 of a set of hoisting hoist 51 in the hoisting device is connected with the support rope of the grab bucket 7, and the wire rope 511 of another set of hoisting hoist 51 is connected with the closing rope of the grab bucket to realize the lifting and lowering of the grab bucket 7. Opening and closing function, the luffing mechanism 6 includes the luffing winch 61 connected in sequence, the luffing coupling 64 with the brake wheel and the luffing motor 63, and the luffing coupling 64 with the brake wheel The luffing brake 62, the luffing frame 4 and the pull arm rope 13 are connected through the luffing movable pulley block 14, the luffing frame 4 is connected with the luffing fixed pulley block 15, and the steel wire rope 611 on the luffing winch 61 bypasses the luffing pulley in turn. The amplitude fixed pulley block 15 and the luffing movable pulley block 14 pull the boom 3 to rotate around the lower hinge point of the boom 3 through the pull arm rope 13, thereby realizing the increase and decrease of the amplitude of the boom 3.

The hoisting hoist 51 in this embodiment includes a hoisting drum 512 with a wire rope 511 wound on its outer surface, a built-in hoisting reducer 513, a hoisting hoisting bracket 514, a hoisting half shaft 515 and a The bearing seat 516 on the hoisting winch bracket 514, the input end housing of the hoisting reducer 513 is fixed on the hoisting hoisting bracket 514 through bolts 10, and the output end housing of the hoisting reducer 513 is fixed on the Inside the lifting drum 512, the front flange of the lifting half shaft 515 is connected to the rear end of the lifting drum 512 through the bolt 10, and the rear end of the lifting half shaft 515 is set in the lifting bearing seat 516 through the bearing 517; The luffing winch 61 includes the luffing drum 612 with multi-layer steel wire ropes 611 wound on the outer surface, the built-in luffing reducer 613, the luffing winch bracket 614, the luffing half shaft 615 and the luffing drum 612 The luffing bearing seat 616 at the rear end, the input end casing of the luffing reducer 613 is fixed on the luffing winch support 614 through bolts 10, and the output end casing of the luffing reducer 613 is fixed on the luffing reel through bolts 10 Inside 612, the front end of the luffing half shaft 615 is set in the luffing bearing seat 616 at the rear end of the luffing reel 612 through the bearing 617, and the rear end of the luffing half shaft 615 is fixed on the luffing winch bracket 614 by bolts 10 Above: The built-in installation method of the reducer for hoisting hoist 51 and luffing hoist 61 can save the installation space occupied by the hoist, and solve the problem of tight space layout of mobile cranes.

The steel wire rope 511 of the hoisting winch 51 in the embodiment is wound on the outer surface of the hoisting drum 512 in a single layer to ensure the normal operation of the automatic following rope pressing device.

Lifting winch 51 is provided with and is used for automatically following the pressing rope device 9 of compression steel wire rope 511, has overcome the slack and chaotic rope phenomenon of steel wire rope when lifting steel rope when grab operation, thereby improves the operating efficiency of grab operation.

The lower part of the hoisting hoist bracket 514 in this embodiment is provided with a spring seat 5141, and the hoisting hoist bracket 514 is also provided with ear plates 5142 located at both ends of the hoist hoist bracket 514, and the two ear plates 5142 are provided with corresponding The reaming holes 5143 and the hinge shaft 5144 fixed between two reaming holes 5143; Wheel 93, sliding part 94 and adjusting mechanism 95, wherein adjusting mechanism 95 can automatically adjust the pressing force of pressing rope device 9, and sliding part 94 can be sliding bearing or sleeve; Adjusting mechanism comprises screw rod 951 and is enclosed within on the screw rod 951 Compress the spring 952, the upper end of the pressure rope bracket 91 is equipped with a pinch wheel shaft 92 and a slider 94, and the lower end of the pressure rope bracket 91 is tightened on the spring seat 5141 of the lifting winch bracket 514 by the screw rod 951, and the pressure wheel 93 is passed through the sliding The piece 94 is set on the pressure wheel shaft 92 and the outer surface is provided with adjacent steel wire rope guide grooves 931 and steel wire rope positioning grooves 932. The steel wire rope guide grooves 931 are used to compress the part of the steel wire rope 511 that is about to enter and exit the rope groove of the lifting drum 512. The adjacent steel wire rope positioning groove 932 can tightly compress the steel wire rope 511 that has been wound on the lifting drum 512 on the surface of the lifting drum 512, thereby ensuring that the steel wire rope 511 will not appear loose and disorderly, The arrangement that the wheel 93 can slide along the pressing wheel shaft 92 ensures that the steel wire rope 511 is neatly arranged on the lifting drum 512, and the rotatable sleeve of the pressing rope bracket 91 on the hinge shaft 5144 can ensure that the steel wire rope 511 can be pressed when the rope 511 is jumping. The pressing force is automatically adjusted to ensure that the wire rope 511 will not jump out of the drum rope groove, and the compression spring 952 can be adjusted to adjust the pressing force of the rope pressing device 9 .

When the crane is in operation, due to improper operation, the boom overshoots at the minimum range, the center of gravity of the whole machine moves backward greatly, and the whole machine overturns backward due to the increase of overturning moment. The traditional anti-rolling brace anti-falling method of the arm frame is adopted. , it is very easy to damage the anti-falling brace, and it is difficult to repair. The boom 3 in this embodiment is provided with a front-pull flexible anti-falling device 31 that prevents the boom 3 from falling backwards. The flexible anti-falling device 31 is a flexible Steel wire rope, one end of flexible steel wire rope is hinged on the root of boom 3, and the other end is hinged on the anti-fall lug seat 33 of boom 3, can stop boom 3 from overshooting backwards and overturning.

Further, in order to prevent the grab bucket 7 from rotating during operation and reduce the working efficiency, the boom 3 is fixed with a grab bucket stabilizer 32 for preventing the grab bucket 7 from rotating. The grab bucket stabilizer 32 includes a steel wire rope 321, a fixed pulley block 323 , sliding trolley 324, the moving pulley block 327 that is fixed on the sliding trolley 324 and the track frame 322 that is fixed on the boom 3 and at least one guide pulley 325, wherein the fixed pulley block 323 is fixed on an end of the track frame 322, and the sliding trolley 324 can Moving along the track frame 322, the two ends of the steel wire rope 321 are respectively fixed on the boom 3 and the grab bucket 7, and the steel wire rope 321 bypasses the fixed pulley block 323, the movable pulley block 327 on the sliding trolley 324 and the guide pulley 325 in turn, and guides The pulley 325 is fixed on the boom 3; in order to prevent the sliding trolley 324 from breaking away from the track frame 322 when sliding, the track frame 322 is also fixed with a buffer block 326 for buffering the sliding car 324, and the buffer block 326 is fixed on the track frame 322 The other end and corresponding to the fixed pulley block.

Furthermore, in order to prevent the hoisting mechanism 5 from exceeding the maximum working range of its hoisting height, causing accidents and damage to the crane, the hoisting hoisting bracket 514 of the hoisting hoist 51 is provided with a hoisting height limiter 11 .

Further, in order to realize the synchronization of the double hoisting mechanisms during the hook operation, an encoder 12 is provided on the hoisting motor 53, and an encoder 12 is provided on the luffing motor 63 in order to ensure that the boom 7 does not overshoot at the minimum amplitude. .

Further, the lifting brake 52 is two single brakes, and the luffing brake 62 is a double brake.

The above-mentioned preferred implementation mode should be regarded as an illustration of the implementation mode of the scheme of this application, and any technical deduction, replacement, improvement, etc. that are similar to, similar to, or based on the scheme of this application should be regarded as the scope of protection of this patent.

Claims (11)

1. one kind has the runabout crane of twin rope grab, comprise underframe, the revolution platform being arranged on underframe and the lifting beam being arranged on revolution platform, sheerleg, lifting mechanism, luffing mechanism and the grab bucket for loading and unloading goods, and for connecting the torque arm rope of sheerleg and lifting beam, it is characterized in that: the volume that hoists that described lifting mechanism comprises two nested structures identical and separate raises device, often the cover volume that hoists is raised device and is comprised lifting electric motor, hoist brake and the volume that hoists are raised, and two the cover wireline that a set of volume that hoists that volume raises in device raises that hoists be connected with the supporting rope of described grab bucket, another cover wireline of raising of volume that hoists is connected with the closed rope of described grab bucket, described luffing mechanism comprises that luffing volume is raised, luffing stopper and luffing electric motor, connected by luffing running block between described sheerleg and described torque arm rope, being provided with luffing fixed pulley group on described sheerleg, the wireline that luffing volume is raised walks around luffing fixed pulley group and luffing running block successively.

2. a kind of runabout crane with twin rope grab according to claim 1, it is characterized in that: described in hoist volume raise the hoisting drum comprising outside surface lay winding wire ropes, the built-in speed reduction unit that hoists, hoist winding support, hoist semiaxis and the bearing support that hoists that hoists on winding support described in being fixed on, the input terminus housing of speed reduction unit of hoisting is fixed on and hoists on winding support, the output terminal housing of speed reduction unit of hoisting is fixed on the inside of hoisting drum, the front end flange of semiaxis of hoisting is connected with hoisting drum rear end, the hoist rear end of semiaxis is sleeved on and hoists in bearing support, described luffing volume is raised the amplitude-changing drum comprising outside surface lay winding wire ropes, built-in luffing speed reduction unit, luffing winding support, luffing semiaxis and is fixed on the luffing bearing support of amplitude-changing drum rear end, the input terminus housing of luffing speed reduction unit is fixed on luffing winding support, the output terminal housing of luffing speed reduction unit is fixed on the inside of amplitude-changing drum, the front end sleeve of luffing semiaxis is contained in luffing bearing support, and the rear end of luffing semiaxis is fixed on luffing winding support.

3. a kind of runabout crane with twin rope grab according to claim 2, it is characterized in that: described in hoist the outside surface of the wireline winding of single layer raised of volume at described hoisting drum, the wireline multiple wraps that described luffing volume is raised is at the outside surface of described amplitude-changing drum.

4. a kind of runabout crane with twin rope grab according to claim 3, it is characterised in that: described in hoist volume raise the rope press device being provided with and compressing described wireline for automatically following.

5. a kind of runabout crane with twin rope grab according to claim 4, it is characterized in that: described in the winding support that hoists comprise spring support and the ear plate at the winding support two ends that hoist described in being positioned at, two ear plates are provided with corresponding fraising and the hinge being fixed in fraising; Described rope press device comprise be rotatably connected on hinge pressure rope support, wheel pressing shaft, the pinch roller slided along wheel pressing shaft, sliding part and regulating mechanism, the compression spring that regulating mechanism comprises screw rod and is enclosed within screw rod, the upper end of pressure rope support is provided with wheel pressing shaft, sliding part and pinch roller, and the lower end of pressure rope support passes through the tension of described screw rod on described spring support, pinch roller is sleeved on wheel pressing shaft by sliding part.

6. a kind of runabout crane with twin rope grab according to claim 5, it is characterised in that: the outside surface of described pinch roller is provided with adjacent wireline guide path and wireline locating slot.

7. a kind of runabout crane with twin rope grab according to claim 2, it is characterised in that: described lifting beam is provided with the front pull-type flexible tilting prevention device preventing described lifting beam from toppling over and the grab bucket stabilizer for preventing described grab bucket from rotating.

8. a kind of runabout crane with twin rope grab according to claim 2, it is characterized in that: described grab bucket stabilizer comprises wireline, fixed pulley group, sliding machine, the running block being fixed on sliding machine and the rail bracket being fixed on lifting beam and at least one leading sheave, fixed pulley group is fixed on one end of rail bracket, and wireline two ends are separately fixed at the running block in described lifting beam and described grab bucket and on the fixed pulley group walked around successively on rail bracket, sliding machine and leading sheave.

9. a kind of runabout crane with twin rope grab according to claim 8, it is characterized in that: be also fixed with the buffer block for cushioning described sliding machine on described rail bracket, buffer block is fixed on one end of described rail bracket and corresponding with described fixed pulley group.

10. a kind of runabout crane with twin rope grab according to claim 7, it is characterized in that: described flexible tilting prevention device is flexible wire ropes, one end of wireline is hinged on described lifting beam root, and the other end is hinged on the anti-down ear seat of described lifting beam.

11. a kind of runabout cranes with twin rope grab according to claim 2, it is characterised in that: described in the winding support that hoists raised of volume that hoists be provided with the height limit device that hoists, described luffing electric motor described in lifting electric motor be provided with encoder; Described hoist brake is two single stoppers, the dual brake that described luffing stopper is.