CN221295955U - Variable-span gantry crane - Google Patents

Abstract

The utility model relates to the field of bridge construction, in particular to a variable-span gantry crane, which comprises a first gantry and a second gantry; the second portal frame is connected with the first portal frame through a beam mechanism; the beam mechanism comprises a beam arranged on the second portal frame; the beam is connected with the first portal frame through the sliding part; the beam can move relative to the first portal frame; the beam mechanism is connected with a hoisting mechanism; roller mechanisms are arranged on the first portal frame and the second portal frame; the utility model discloses a variable-span gantry crane which can realize the lifting and mounting of prefabricated components, and simultaneously, the variable-span gantry crane disclosed by the utility model can realize the lifting operation of the prefabricated components from a plurality of areas such as bridge decks or bridge sides through the cooperation of a first gantry, a second gantry and a lifting mechanism.

Description

Variable-span gantry crane

Technical Field

The utility model relates to the field of bridge construction, in particular to a variable-span gantry crane.

Background

The prefabricated components of the ditch cable grooves on two sides of the bridge surface of the high-speed railway are installed, because the bridge girder is not erected, the bridge girder erection machine passes through the bridge deck, the width and the height of equipment on the bridge are limited, and the installation equipment needs to avoid the bridge girder erection machine.

The usual way of installation is to transport the components to the site with a truck crane and place them on both sides of the beam surface, and then install them with a forklift.

In the avoiding operation Liang Cheshi, the forklift is stopped at the side edge of the beam; the traffic time of the truck crane needs to be staggered with that of the beam transporting vehicle, and the continuity of the installation operation is seriously affected.

Meanwhile, the forklift only has the operation capability in two directions when moving along a straight line, namely, the forklift cannot move along the direction perpendicular to the car body, the direction adjustment difficulty is high when in actual use, and the adjustment is not easy.

In order to improve at least one of the above problems, an auxiliary device is required to assist in the installation of the deck prefabrication member.

Through retrieval, the prior patent 201922083958.2-a gantry crane with variable height can be found to realize the beam changing construction of the bridge; but it can not be fine be applicable to the hoist and mount of ditch cable groove prefabricated component to during operation, can not fine dodge at fortune roof beam car, influence the efficiency of construction.

Disclosure of utility model

The utility model aims to provide a portable self-adjusting gantry crane structure capable of realizing hoisting and transferring of prefabricated parts.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

A variable-span gantry crane comprises a first gantry and a second gantry; the second portal frame is connected with the first portal frame through a beam mechanism;

the beam mechanism comprises a beam arranged on the second portal frame;

The beam is connected with the first portal frame through the sliding part; the beam can move relative to the first portal frame;

the beam mechanism is connected with a hoisting mechanism;

Roller mechanisms are arranged on the first portal frame and the second portal frame.

And a balancing weight is arranged on the second portal frame.

The rolling mechanism comprises a transverse traveling wheel set and a longitudinal traveling wheel set.

The longitudinal traveling wheel set is connected with an adjusting mechanism; the adjusting mechanism comprises an adjusting cylinder; one end of the adjusting cylinder is connected to the first portal frame or the second portal frame; the other end is connected to the longitudinal walking wheel set.

The adjusting mechanism further comprises a supporting upright post connected to the first portal frame or the second portal frame and a sleeve arranged on the longitudinal traveling wheel set; the sleeve is sleeved on the outer side of the adjusting cylinder; the support upright post is inserted into the end part of the sleeve.

The sliding part comprises a sliding block arranged on the first portal frame, and a sliding groove is formed in the sliding block; the cross beam is inserted into the chute.

And rollers are arranged in the sliding grooves.

The sliding groove is a T-shaped groove; the vertical section of the cross beam is also T-shaped.

A lower travelling beam is arranged on the second portal frame; and the lower traveling beam is provided with a generator and a balancing weight.

The beam mechanism comprises two beams which are distributed in parallel at intervals, and each beam is connected with the first portal frame through a sliding part.

The utility model has the advantages that:

The utility model discloses a variable-span gantry crane which can realize the lifting and mounting of prefabricated components, and simultaneously, through the cooperation of a first gantry, a second gantry and a lifting mechanism, the variable-span gantry crane can realize the lifting operation of the prefabricated components from a plurality of areas such as a bridge deck or a bridge edge, and the mutual distance between the first gantry and the second gantry can be changed according to the needs, so that the interference between the variable-span gantry crane and adjacent components during the use can be reduced.

Drawings

The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:

fig. 1: a front view of the gantry crane.

Fig. 2: a side view of the gantry crane.

Fig. 3: a top view of the gantry crane.

Fig. 4: an enlarged view of the partial structure in fig. 1.

Fig. 5: the crane is unloaded from the deck truck and installed.

Fig. 6: the crane is unloaded from the under-axle truck and installed.

Fig. 7: and the gantry crane avoids the beam transporting vehicle.

The labels in the above figures are:

1. The bridge crane comprises a transport vehicle, 2, a variable span gantry crane, 3, prefabricated components, 4, a bridge deck, 5, a beam transporting vehicle, 2-1, a first gantry, 2-2, a stand column of the first gantry, 2-3, a chute, 2-4, rollers, 2-5, a cross beam, 2-6, a second gantry, 2-7, an electric hoist, 2-8, a supporting stand column, 2-9, a sleeve, 2-10, an adjusting cylinder, 2-11, a longitudinal beam, 2-12, a stand column of the second gantry, 2-13, a transverse traveling wheel set, 2-14, a traveling beam, 2-15, a longitudinal traveling wheel set, 2-16, a longitudinal traveling wheel support, 2-17, a generator, 2-18, a balancing weight, 2-19 and a descending traveling beam.

Detailed Description

The following detailed description of the utility model refers to the accompanying drawings, which illustrate preferred embodiments of the utility model in further detail.

A variable-span gantry crane 2 comprises a first gantry 2-1 and a second gantry 2-6; the second portal frame 2-6 is connected with the first portal frame 2-1 through a beam mechanism 205; the beam mechanism 205 comprises a beam 2-5 arranged on a second portal frame 2-6; the cross beam 2-5 is connected with the first portal frame 2-1 through a sliding part; the beam 2-5 can move relative to the first portal frame 2-1; the beam mechanism 205 is connected with a hoisting mechanism; the utility model discloses a span-changing gantry crane 2, which can realize the lifting and mounting of prefabricated components 3, and simultaneously, the span-changing gantry crane 2 disclosed by the utility model can realize the lifting operation of the prefabricated components 3 from a plurality of areas such as a bridge deck 4 or a bridge edge through the cooperation of a first gantry 2-1, a second gantry 2-6 and a lifting mechanism, and the distance between the first gantry 2-1 and the second gantry 2-6 can be changed according to the needs, so that the interference between the span-changing gantry crane 2 and adjacent components can be reduced when in use.

The utility model discloses a variable span gantry crane 2 which is mainly used for loading and unloading prefabricated components 3 on a bridge deck 4; specifically, the variable-span gantry crane 2 disclosed by the utility model mainly comprises a first gantry 2-1 and a second gantry 2-6; in the utility model, the first portal frame 2-1 and the second portal frame 2-6 are two portal frame structures which are distributed at intervals, and the whole structure is inverted U-shaped; in addition, in order to facilitate the cooperation of the first portal frame 2-1 and the second portal frame 2-6, the second portal frame 2-6 is required to be smaller than the first portal frame 2-1 in size; by the arrangement, the second portal frame 2-6 is conveniently spliced on the inner side of the first portal frame 2-1 through the cross beam 2-5.

Whereas in the present utility model the second gantry 2-6 is connected to the first gantry 2-1 via a beam mechanism 205; the beam mechanism 205 comprises a beam 2-5 arranged on a second portal frame 2-6; the cross beam 2-5 is connected with the first portal frame 2-1 through a sliding part; the beam 2-5 can move relative to the first portal frame 2-1; the arrangement of the cross beam 2-5 plays a good bridging role, and facilitates the connection between the first portal frame 2-1 and the second portal frame 2-6, in addition, the arrangement of the cross beam 2-5 is mainly convenient for realizing the installation connection of a hoisting mechanism, and in particular, the cross beam mechanism 205 is connected and provided with the hoisting mechanism; the hoisting mechanism can realize the hoisting installation of the prefabricated part 3.

Meanwhile, the hoisting mechanism mainly comprises electric hoist 2-7; other hoisting mechanisms can be adopted, and the arrangement positions of the hoisting mechanisms on the cross beams 2-5 can be changed according to the needs when the hoisting mechanisms are actually connected for use; the changing mode can be that an operator manually adjusts the installation position of the hoisting mechanism on the cross beam 2-5, and other adjusting modes can also be adopted.

In addition, in the utility model, roller wheel 2-4 mechanisms are arranged on the first portal frame 2-1 and the second portal frame 2-6; the roller 2-4 mechanism is arranged, so that the first portal frame 2-1 or the second portal frame 2-6 can be conveniently changed in working position according to the requirement.

Further, in the utility model, the second portal frame 2-6 is provided with a balancing weight; in the utility model, the balancing weight is arranged on the second portal frame 2-6, so that the arrangement plays a good role in balancing weight, and the stability of the variable-span gantry crane 2 arranged at the bridge edge can be ensured.

Further, in the present utility model, the rolling mechanism 201 includes a transverse traveling wheel set 2-13 and a longitudinal traveling wheel set 2-15; according to the utility model, the rolling mechanism 201 can enable the variable-span gantry crane 2 to have transverse and longitudinal movement capacity through the arrangement of the transverse traveling wheel sets 2-13 and the longitudinal traveling wheel sets 2-15; in addition, in the actual connection arrangement, two ends of the first portal frame 2-1 are respectively provided with one rolling mechanism 201, and two ends of the second portal frame 2-6 are also respectively provided with one rolling mechanism 201, in other words, the span-changing gantry crane 2 disclosed by the utility model at least comprises four rolling mechanisms 201, and based on the design, the whole span-changing gantry crane 2 can move on the bridge deck 4 according to the requirement.

Meanwhile, locking mechanisms are arranged on the transverse traveling wheel sets 2-13 and the longitudinal traveling wheel sets 2-15, and the locking mechanisms are arranged on the rollers 2-4, which belong to the prior art and are not repeated here.

Further, in the utility model, the longitudinal walking wheel sets 2-15 are connected with an adjusting mechanism; the setting of the adjusting mechanism in the utility model; whether the longitudinal traveling wheel set 2-15 is in contact with the bridge deck 4 or not can be changed according to the requirement, so that the subsequent control of the contact between the transverse traveling wheel set 2-13 or the longitudinal traveling wheel set 2-15 and the bridge deck 4 according to the requirement is facilitated, and the change of the position of the variable-span gantry crane 2 is facilitated.

In particular, the adjusting mechanism comprises adjusting cylinders 2-10; one end of the adjusting cylinder 2-10 is connected to the first portal frame 2-1 or the second portal frame 2-6; the other end is connected with the longitudinal traveling wheel set 2-15; the adjusting cylinder 2-10 can be a hydraulic cylinder, an air cylinder or an electric cylinder, and mainly can change the longitudinal height of the longitudinal traveling wheel set 2-15 according to the requirement, and can select the transverse traveling wheel set 2-13 or the longitudinal traveling wheel set 2-15 to be contacted with the bridge deck 4 during subsequent use, so that the change of the position of the variable span gantry crane 2 during subsequent use is finally realized.

Further, in the utility model, the adjusting mechanism also comprises a support upright post 2-8 connected to the first portal frame 2-1 or the second portal frame 2-6 and a sleeve 2-9 arranged on the longitudinal traveling wheel set 2-15; the sleeve 2-9 is sleeved outside the adjusting cylinder 2-10; the support upright posts 2-8 are spliced at the end parts of the sleeves 2-9; the support upright post 2-8 and the sleeve 2-9 are arranged, so that a good calibration and limiting effect is achieved, the vertical traveling wheel set 2-15 can conveniently reciprocate up and down in linearity, the sleeve 2-9 can also protect the adjusting cylinder 2-10, and the service life of the adjusting cylinder 2-10 is prolonged.

Further, in the utility model, the sliding part comprises a sliding block 2-31 arranged on the first portal frame 2-1, and a sliding groove 2-3 is arranged on the sliding block 2-31; the cross beam 2-5 is inserted into the chute 2-3; according to the utility model, the sliding block 2-31 is a connecting block, the cross beam 2-5 is inserted into the sliding groove 2-3, and when the second portal frame 2-6 and the first portal frame 2-1 relatively move in subsequent use, the cross beam 2-5 plays a good guiding and limiting role, and based on the design, the arrangement of the sliding part can be clearly known, a good bridging effect is achieved, and the connection between the cross beam 2-5 and the first portal frame 2-1 is facilitated.

Further, in the utility model, rollers 2-4 are arranged in the sliding grooves 2-3; the rollers 2-4 are arranged at the bottom of the sliding groove 2-3, the cross beam 2-5 is arranged on the rollers 2-4, and based on the design, the cross beam 2-5 can avoid sliding friction with the inner wall of the sliding groove 2-3 during subsequent use; the running resistance of the cross beam 2-5 is reduced.

Further, in the utility model, the sliding chute 2-3 is a T-shaped chute; the vertical section of the cross beam 2-5 is also T-shaped; based on the design, the cross beam 2-5 is correspondingly hung in the chute 2-3, so that the stability of the connection of the cross beam 2-5 at the bottom of the first portal frame 2-1 is facilitated.

Further, in the utility model, the second portal frame 2-6 is provided with a lower travelling beam 2-19; the lower walking beams 2-19 are provided with generators and balancing weights; the arrangement of the downward walking beams 2-19 is a bottom supporting beam, so that the installation of the generator and the balancing weights on the second portal frame 2-6 is facilitated, meanwhile, the generator and the balancing weights play a good role in balancing weight and coverage, and the arrangement stability of the variable-span gantry crane 2 on the bridge deck 4 is better ensured.

Meanwhile, in the utility model, the generator can be connected with a storage battery, the storage battery is connected with a driving motor, the driving motor can be connected with the walking wheels in the transverse walking wheel sets 2-13 and the longitudinal walking wheel sets 2-15 through belts or chains, and the driving motor drives the corresponding walking wheels to move, so that the position of the variable-span gantry crane 2 is changed.

Further, in the present utility model, the beam mechanism 205 includes two beams 2-5 spaced in parallel, and each beam 2-5 is connected to the first gantry 2-1 through a sliding portion; through the cooperation of two crossbeams 2-5, very big assurance first portal frame 2-1 and the stability of second portal frame 2-6 connection play mutual calibration effect when two crossbeams 2-5 are led simultaneously, have made things convenient for the stability of first portal frame 2-1 and the relative operation of second portal frame 2-6.

Specifically:

The utility model discloses a variable-span gantry crane 2, which mainly can be used for unloading and installing prefabricated parts 3 from a transport vehicle 1 on a bridge deck 4 or unloading and installing the prefabricated parts 3 from the transport vehicle 1 on a bridge side channel, and can furthest reduce the influence of a girder transporting vehicle 5 on the transport vehicle 1.

The utility model discloses a variable-span gantry crane 2 which mainly comprises a first gantry 2-1 and a second gantry 2-6; the variable-span gantry crane 2 disclosed by the utility model is provided with a large gantry and a small gantry, the lower travelling beams 2-19 of the second gantry 2-6 are provided with the balancing weights 2-18 and the generators 2-17, the balancing weights ensure that the lifting weights cannot topple when avoiding the beam transporting vehicle 5, and the generators provide power for the gantry crane.

Two cross beams 2-5 are connected between the first portal frame 2-1 and the second portal frame 2-6, the cross beams 2-5 are fixedly connected with the second portal frame 2-6, and are arranged on the cross beams 2-5 of the second portal frame 2-6; is connected with the first portal frame 2-1 in a sliding way, and a roller wheel 2-4 is arranged in a sliding groove 2-3 below the first portal frame 2-1 to support a cross beam 2-5.

The electric hoist 2-7 capable of walking along the longitudinal beams 2-11 is hung below the longitudinal beams 2-11, the electric hoist 2-7 can be used for unloading and installing the prefabricated part 3 from the transport vehicle 1 of the bridge deck 4, and also can be used for unloading and installing the prefabricated part 3 from the transport vehicle 1 on a bridge side channel, so that the influence of the transport vehicle 5 on the transport vehicle 1 can be reduced to the greatest extent.

A travelling beam 2-14 is arranged below the upright post 2-2 of the first portal frame 2-1, two transverse travelling wheel sets 2-13 capable of travelling along the direction of the cross beam 2-5 are arranged below each travelling beam 2-14, and a longitudinal travelling wheel set 2-15 capable of travelling along the longitudinal beam 2-11 is arranged outside each travelling beam 2-14; a group of transverse traveling wheel sets 2-13 are respectively arranged below the upright posts of the second portal frame 2-6, and a longitudinal traveling wheel set 2-15 which runs along the longitudinal beam 2-11 is respectively connected to the front side and the rear side of the upright post 2-12 of the second portal frame 2-6.

The outside of a supporting upright post 2-8 of a longitudinal traveling wheel set 2-15 is provided with a sleeve 2-9, the lower part of the supporting upright post 2-8 is connected with the upper end of an adjusting cylinder 2-10, the upper part of the supporting upright post 2-8 is connected with an upright post 2-2 of a first portal frame 2-1 or an upright post 2-12 of a second portal frame 2-6, the lower end of the adjusting cylinder 2-10 is connected with a support 2-16 of the longitudinal traveling wheel set 2-15, the sleeve 2-9 slides up and down along the supporting upright post 2-8 through the adjusting cylinder 2-10, so that the longitudinal traveling wheel set 2-15 is lifted or put down, when the longitudinal traveling wheel set 2-15 is lifted, the transverse traveling wheel set 2-13 lands, the portal crane 2 can travel transversely, when the longitudinal traveling wheel set 2-15 is put down, the transverse traveling wheel set 2-13 is suspended, and the portal crane 2 can travel longitudinally. When the beam transporting vehicle 5 is avoided, the gantry crane 22 is stopped at the position without the prefabricated part 3 in front of the operation, the outer side of the transverse travelling wheel 2-13 of the first portal frame 2-1 is 300mm away from the beam edge, when the center distance between the second portal frame 2-6 and the first portal frame 2-1 is smaller than 600mm, the width of the base of the gantry crane 22 is smaller than 2 m, when the beam transporting vehicle 5 walks in the beam center, the wheel edge is 2541mm away from the beam edge, and the gantry crane 22 can avoid the beam transporting vehicle 5 and ensure that the gantry crane 22 and the beam 4 edge have a certain safety distance.

Job program

Performing routine inspection on each component;

the power generator 2-17 starts power supply;

2-10 of a locking mechanism for unlocking each travelling wheel;

When the prefabricated part 3 is transported from the bridge deck 4, the gantry crane 2 stops at a position 1.8 meters away from the side of the beam 4 (the prefabricated part 3 is 1.77 meters wide); the distance between the second portal frame 2-6 and the first portal frame 2-1 is 3 meters, so that the transport vehicle 1 is ensured to stop between the first portal frame 2-1 and the second portal frame 2-6. When the prefabricated part 3 is transported from the under-bridge, the gantry crane 2 is stopped at a position 0.3 m away from the side of the beam 4 (ensuring a safe distance), and the cross beam 2-5 extends to reach above the prefabricated part 3 on the transport vehicle 1.

The electric hoist 2-7 lifts the prefabricated part 3 from the transport vehicle 1;

when the prefabricated part 3 is transported from the bridge deck 4, the electric hoist 2-7 lifts the prefabricated part 3 to the side of the beam 4 for installation. When the prefabricated part 3 is transported from the under-bridge, the second portal frame 2-6 walks into the beam 4, and when the distance from the second portal frame 2-1 is 3 meters, the whole portal frame 2 walks into the beam 4 until the prefabricated part 3 reaches the installation position for installation.

After the gantry crane 2 is installed, the longitudinal wheel set 15 is extended, the gantry crane is jacked up to enable the transverse wheel set to be about 5cm away from the ground, the length of one prefabricated part 3 is moved forwards, the longitudinal wheel set 15 is retracted to be about 5cm away from the ground, the transverse wheel set is landed, and the next prefabricated part 3 is installed;

When the beam transporting vehicle 52 passes through, the gantry crane 2 moves to the side edge of the beam 4, the cross beam 2-5 extends out of the beam 4, the large gantry crane 2-1 is 0.3 m away from the side edge of the beam 4, and the small gantry crane 2-6 moves to the large gantry crane and stops at a position 0.1 m away from the large gantry crane. The travelling wheel is locked. The beam transport vehicle 5 continues to work after passing through.

The utility model discloses a gantry crane 2, wherein two beams 2-5 are connected between two gantry frames 2-1 and 2-6 of the gantry crane 22, the beams 2-5 are fixedly connected with a second gantry frame 2-6, and are arranged on the beams 2-5 of the second gantry frame 2-6 and are in sliding connection with a first gantry frame 2-1. When the longitudinal traveling wheel set 2-15 is lifted, the gantry crane 22 transversely travels, the second portal frame 2-6 can travel relative to the first portal frame 2-1, and the free end of the cross beam 2-5 can extend out of the first portal frame 2-1 to form a cantilever beam; when the longitudinal traveling wheel set 2-15 falls, the transverse traveling wheel set 2-13 is lifted off the ground, and the gantry crane 2 longitudinally travels. The electric hoist 2-7 can be used for unloading the prefabricated part 3 from the transport vehicle 1 on the bridge deck 4 and installing the prefabricated part 3, and also can be used for unloading the prefabricated part 3 from the transport vehicle 1 on the bridge side channel and installing the prefabricated part 3, so that the influence of the girder transporting vehicle 5 on the transport vehicle 1 can be reduced to the greatest extent. The second portal frame 2-6 moves to the vicinity of the first portal frame 2-1, and the whole portal crane 2 stops at the side edge of the beam, so that the beam transporting vehicle 5 can be avoided to pass through.

The gantry crane 2 is characterized by comprising a first portal frame 2-1, a second portal frame 2-6, a cross beam 2-5, a chute 2-3, rollers 2-4, a transverse traveling wheel set 2-13 and a longitudinal traveling wheel set 2-15.

Two cross beams 2-5 are connected between the first portal frame 2-1 and the second portal frame 2-6,

The cross beam 2-5 is fixedly connected with the second portal frame 2-6 and is arranged on the cross beam 2-5 of the second portal frame 2-6;

The cross beam 2-5 is in sliding connection with the first portal frame 2-1, and the roller 2-4 is arranged in the chute 2-3 below the first portal frame 2-1 to support the cross beam 2-5.

The top of the cross beam 2-5 is provided with a certain gap with the lower side of the first portal frame 2-1, and the top of the cross beam and the lower side of the first portal frame 2-1 cannot interfere when the ground is uneven.

The transverse traveling wheel set 2-13 and the longitudinal traveling wheel set 2-15 are arranged below the upright posts of the first portal frame 2-1 and the second portal frame 2-6, and have parking braking functions, so that the gantry crane 22 is prevented from sliding.

The outside of a supporting upright post 2-8 of the longitudinal traveling wheel set 2-15 is provided with a sleeve 2-9, the lower part of the supporting upright post 2-8 is connected with the upper end of an adjusting cylinder 2-10, the upper part of the supporting upright post 2-8 is connected with an upright post 2-2 of a first portal frame 2-1 or an upright post 2-12 of a second portal frame 2-6, the lower end of the adjusting cylinder 2-10 is connected with a bracket 2-16 of the longitudinal traveling wheel set 2-15, and the sleeve 2-9 can slide up and down along the supporting upright post 2-8 through the adjusting cylinder 2-10, so that the longitudinal traveling wheel set 2-15 can be lifted or fallen.

The horizontal traveling wheel set 2-13 lands when the vertical traveling wheel set 2-15 is lifted, the gantry crane 22 can horizontally travel, the horizontal traveling wheel set 2-13 is lifted when the vertical traveling wheel set 2-15 falls, and the gantry crane 22 can longitudinally travel.

The transverse wheel sets 2-13 can be divided into a transverse wheel set 2-13 of the first portal frame 2-1 and a transverse wheel set 2-13 of the second portal frame 2-6, both of which can be independently operated, and only when the transverse wheel set 2-13 of the second portal frame 2-6 acts, the second portal frame 2-6 walks relative to the large portal crane 22-1, and when the two act simultaneously, the portal crane 22 walks transversely.

The center distance between the second portal frame 2-6 and the first portal frame 2-1 can be less than 600mm, the total width of the base of the gantry crane 2 is less than 2000mm, the wheel edge is 2541mm away from the beam edge when the beam transporting vehicle 5 walks in the beam center, and the gantry crane 2 can avoid the beam transporting vehicle 5 and can ensure that the gantry crane 2 and the beam edge have a certain safety distance.

It is obvious that the specific implementation of the present utility model is not limited by the above-mentioned modes, and that it is within the scope of protection of the present utility model only to adopt various insubstantial modifications made by the method conception and technical scheme of the present utility model.

Claims (10)

1. The variable-span gantry crane is characterized by comprising a first gantry and a second gantry; the second portal frame is connected with the first portal frame through a beam mechanism;

the beam mechanism comprises a beam arranged on the second portal frame;

The beam is connected with the first portal frame through the sliding part; the beam can move relative to the first portal frame;

the beam mechanism is connected with a hoisting mechanism;

Roller mechanisms are arranged on the first portal frame and the second portal frame.

2. The variable span gantry crane of claim 1, wherein the second gantry is provided with a counterweight.

3. A variable span gantry crane according to any one of claims 1-2, wherein the roller mechanism comprises a transverse running wheel set and a longitudinal running wheel set.

4. A variable span gantry crane according to claim 3, wherein the longitudinal running wheel sets are connected with an adjustment mechanism; the adjusting mechanism comprises an adjusting cylinder; one end of the adjusting cylinder is connected to the first portal frame or the second portal frame; the other end is connected to the longitudinal walking wheel set.

5. The variable span gantry crane of claim 4, wherein the adjustment mechanism further comprises a support post connected to the first gantry or the second gantry and a sleeve disposed on the longitudinal running gear set; the sleeve is sleeved on the outer side of the adjusting cylinder; the support upright post is inserted into the end part of the sleeve.

6. The variable span gantry crane of claim 1, wherein the sliding portion comprises a sliding block arranged on the first gantry, and a sliding groove is arranged on the sliding block; the cross beam is inserted into the chute.

7. The variable span gantry crane of claim 6, wherein rollers are disposed in the chute.

8. The variable span gantry crane of claim 7, wherein the chute is a T-shaped chute;

The vertical section of the cross beam is also T-shaped.

9. The variable span gantry crane of claim 2, wherein the second gantry is provided with a lower traveling beam; and the lower traveling beam is provided with a generator and a balancing weight.

10. A variable span gantry crane according to claim 1, wherein the beam mechanism comprises two spaced parallel beams, each beam being connected to the first gantry by a sliding portion.