CN112479032A

CN112479032A - Gantry crane

Info

Publication number: CN112479032A
Application number: CN202011285488.9A
Authority: CN
Inventors: 江富豪; 祁加勇; 袁光金; 汤应福; 谢斯垚
Original assignee: China Railway Wuxin Heavy Industry Co Ltd
Current assignee: China Railway Wuxin Heavy Industry Co Ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-03-12

Abstract

The invention discloses a gantry crane, which comprises a lifting appliance system, a trolley frame and two pairs of anti-rolling units, wherein a lifting winding drum is arranged on the trolley frame, each anti-rolling unit comprises an anti-rolling winding drum, an anti-rolling rope, a swinging pulley and a swinging driving mechanism, and the anti-rolling winding drums are fixed on the lifting winding drums and are coaxially arranged with the lifting winding drums; the anti-rolling rope bypasses the anti-rolling winding drum and the swinging pulley to turn and then is connected with a lifting appliance system; arranging a stabilizing rope between the swing pulley and the hanger system as a stabilizing section, wherein the stabilizing sections of the two stabilizing units in pairs are positioned in different vertical planes, and the projections of the two stabilizing sections in the same X-Z plane are crossed; swing pulleys of the two paired anti-rolling units are arranged at intervals along the X-axis direction, and two pairs of anti-rolling sections are arranged at intervals along the Y-axis direction; the swing driving mechanism is used for driving the corresponding swing pulley to take up or pay off the rope. The gantry crane not only can realize functions of stabilization, lifting appliance tilting and rotation, but also has the advantages of simple structure and low cost.

Description

Gantry crane

Technical Field

The invention relates to the technical field of hoisting machinery, in particular to a gantry crane.

Background

After the container ship is landed, the container on the ship needs to be efficiently unloaded to the shore by the hoisting equipment on the wharf. The adopted equipment mainly comprises a shore side container portal crane (hereinafter referred to as a shore bridge), a track type container portal crane (hereinafter referred to as a gantry crane) and the like. When a crane loads and unloads and lifts a container, the crane needs to have a swing-reducing function to inhibit the swing of the container and a spreader system; and the function of tilting is also needed, namely the function that the lifting appliance system tilts +/-3 degrees along the direction of the trolley, tilts +/-3 degrees along the direction of the trolley and rotates +/-5 degrees in a horizontal plane can be realized, so that the lifting appliance system is suitable for the shaking of the ship.

The hoisting mechanism of the shore bridge is not arranged on the movable trolley but arranged in a machine room, a traction steel wire rope arrangement mode is adopted, and a plurality of sets of complex 'motors + reducers + screw rod' mechanisms are arranged at the front end of a girder of the shore bridge to realize the tilting function. Shore bridges generally employ electronic roll stabilization.

A hoisting mechanism of the gantry crane is arranged on the movable trolley, and a mechanical anti-rolling mechanism of the gantry crane generally has the modes of a hoisting steel wire rope inclined-pulling anti-rolling device, an independent anti-rolling device and the like. The oblique pulling and stabilization of the lifting steel wire rope are realized by increasing the winding angle of the lifting rope, most typically, the eight-rope stabilization has the advantages of large enough winding angle, satisfactory stabilization effect in the direction of a trolley and the defects of too many pulleys which are wound by the lifting rope, obviously reduced service life of the lifting rope and high use and maintenance cost. The independent anti-rolling device is referred to CN201220568248.4, the method has the advantages that the service life of the lifting rope is ensured, the anti-rolling effect in the directions of the big car and the small car is good, but an independent driving device is needed to drive the anti-rolling drum, so that two or four independent driving mechanisms are needed, the structure is complex, and the cost is high. The gantry crane has the function of rotating the lifting appliance by +/-5 degrees, and does not have the function of inclining by +/-3 degrees in the direction of the trolley and inclining by +/-3 degrees in the direction of the trolley. CN202829333U discloses a swing driving mechanism and a crane, which need to set up an independent driving device to drive a tilting drum, and need to lift the drum and the lifting rope, not only the structure is complex, the cost is high, but also the service life of the lifting rope is reduced.

At present, a plurality of inland wharfs adopt long-cantilever gantry cranes to replace shore bridges for loading and unloading containers on ships, so that the equipment purchasing cost is greatly reduced, and wharf front-edge ship unloading and rear yard container dumping can be considered. In fact, at present, no gantry crane which has the functions of lifting, stabilizing and tilting and is economical and reasonable exists, so that the increasing use requirement is met.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a gantry crane which can realize functions of stabilization, tilting and rotation of a lifting appliance, and has a simple structure and low cost.

In order to solve the technical problems, the invention adopts the following technical scheme:

a gantry crane comprises a lifting appliance system, a trolley frame and two pairs of anti-rolling units, wherein a lifting mechanism for connecting the lifting appliance system and the trolley frame is arranged on the trolley frame and comprises a lifting winding drum; the anti-rolling unit comprises an anti-rolling winding drum and an anti-rolling rope wound on the anti-rolling winding drum, one end of the anti-rolling rope is fixed on the anti-rolling winding drum, the other end of the anti-rolling rope is fixed on the lifting appliance system, one of the cart direction and the trolley direction is set to be an X direction, the other of the cart direction and the trolley direction is set to be a Y direction, and the lifting direction is set to be a Z direction;

the anti-rolling winding drum is fixed on the lifting winding drum, and the anti-rolling winding drum and the lifting winding drum are coaxially arranged; the anti-rolling unit also comprises a swinging pulley, and the anti-rolling rope is connected with the lifting appliance system after being turned by the swinging pulley; the anti-rolling rope between the swing pulley and the hanger system is an anti-rolling section, the anti-rolling sections of the two anti-rolling units in pairs are positioned in different vertical planes, and the projections of the two anti-rolling sections in the same X-Z plane are arranged in a cross way; swing pulleys of the two paired anti-rolling units are arranged at intervals along the X-axis direction, and two pairs of anti-rolling sections are arranged at intervals along the Y-axis direction;

the trolley frame is provided with four swing driving mechanisms, the swing driving mechanisms correspond to the swing pulleys one by one, and the swing driving mechanisms are used for driving the swing pulleys to take up or pay off ropes.

When the crane hoisting mechanism hoists goods to ascend (or descend), the hoisting motor drives the hoisting drum to rotate to wind (or unwind) the rope, the anti-rolling drum rotates along with the hoisting drum so as to wind (or put down) the anti-rolling steel wire rope, the swing driving mechanism pushes the swing pulley to rotate, and therefore the length of the anti-rolling steel wire rope is adjusted, and the anti-rolling steel wire rope is in a critical tensioning state.

Therefore, the arrangement of the anti-rolling sections from the small car frame to the lifting appliance system is in one-way cross arrangement, namely, the anti-rolling sections are obliquely pulled along the traveling direction (X direction) of the large car, and when the lifting appliance system swings along the traveling direction of the large car, the oblique pulling structure formed by the anti-rolling steel wire rope along the X direction restrains the swing, so that the anti-rolling effect in the traveling direction of the large car is realized.

Two swing actuating mechanism along X direction one side drive two swing pulleys of this side respectively and receive the rope, two swing actuating mechanism along X direction opposite side drive two swing pulleys of this side respectively simultaneously and unreel the rope (or unreel the rope along two swing pulleys of X direction one side, receive the rope along two swing pulleys of X direction opposite side simultaneously), can realize verting of hoist system along the X direction, the angle of verting (generally being 3 degrees) can be realized through swing actuating mechanism's stroke. Similarly, two swing driving mechanisms on one side of the Y direction respectively drive two swing pulleys on the side to take up the rope, and two swing driving mechanisms on the other side of the Y direction simultaneously respectively drive two swing pulleys on the side to take up the rope (or two swing pulleys on one side of the Y direction to take up the rope, and two swing pulleys on the other side of the Y direction simultaneously), so that the tilting of the hanger system along the Y direction can be realized.

The two swing driving mechanisms on the same diagonal line respectively drive the corresponding swing pulleys to take up the ropes at the same time, and the two swing driving mechanisms on the other diagonal line respectively drive the corresponding swing pulleys to pay off the ropes at the same time, so that the rotation of the lifting appliance system can be realized.

In the traditional gantry crane, if the hoisting steel wire rope is obliquely pulled to realize the anti-rolling function, the problems of reduced service life and high use and maintenance cost caused by more rewinding times of the hoisting steel wire rope exist, and a lifting appliance system rotating +/-5 degrees needs to be configured, so that the cost is very high and the gantry crane does not have the tilting function; if the independent stabilization device is adopted to realize stabilization, the stabilization device needs to be provided with an independent driving device, the cost is high, and the lifting mechanism is additionally provided with a set of electric push rod, so that the function of rotating +/-5 degrees can be realized, and the inclination function is not also realized. The invention provides a tilting and anti-rolling multifunctional device and a technical scheme of a method for realizing the tilting and anti-rolling multifunctional device, which can well play roles in anti-rolling, front and back tilting of a lifting appliance, left and right tilting of the lifting appliance and rotation of the lifting appliance, and reduce the cost, namely the cost can be reduced, and the tilting and anti-rolling multifunctional device has good tilting and anti-rolling effects, and well meets the requirements of society and industry.

As a further improvement of the above technical solution:

the lifting mechanism further comprises a lifting rope wound on the lifting drum and two lifting pulleys arranged on the lifting appliance system, and the two lifting pulleys of the lifting mechanism are arranged at intervals along the Y-axis direction; two rope outlet ends of the rope are fixed on the trolley frame after respectively bypassing the lifting pulleys with the rope outlet directions opposite to the rope outlet directions of the rope outlet ends.

When the lifting appliance system swings along the travelling direction (Y direction) of the trolley, the lifting steel wire rope can be lifted to form a cable-stayed structure along the Y direction, so that the swinging of the lifting appliance system in the Y direction can be inhibited, and the effect of stabilizing the travelling direction of the trolley is achieved.

The hoisting mechanism further comprises first guide wheels in one-to-one correspondence with the two rope outlet ends, and the rope outlet ends are fixed on the trolley frame after sequentially bypassing the corresponding first guide wheels and hoisting pulleys with the rope outlet directions opposite to the rope outlet directions.

A lifting rope section from a lifting pulley to a trolley frame fixing point is a fixed section, two fixed sections of the lifting mechanism are located in different vertical planes, and projections of the two fixed sections in the same Y-Z plane are arranged in a crossed mode.

The lifting mechanism further comprises a lifting motor and a lifting speed reducer in transmission connection with the lifting motor, and the lifting speed reducer is in transmission connection with the lifting winding drum.

The lifting mechanism is provided with two sets, and the two sets of lifting mechanisms are arranged at intervals along the X direction.

The four anti-rolling winding drums are respectively arranged at two ends of the two lifting winding drums.

The swing driving mechanism comprises an electric push rod, a hydraulic oil cylinder, a motor screw or a linear motor.

The lengths of the four roll reducing sections are all equal.

The roll reduction unit further comprises at least one guide pulley, and the roll reduction rope is wound on the roll reduction drum, the one or more guide pulleys and the swinging pulley in sequence.

Compared with the prior art, the invention has the advantages that:

1. according to the gantry crane, the anti-rolling winding drum is directly driven by the hoisting mechanism, so that an anti-rolling driving mechanism is not required to be configured, and the cost is greatly reduced. And the number of times of reversely winding the pulley of the lifting steel wire rope is minimum, so that the service life of the lifting steel wire rope is ensured. In addition, the steel wire ropes have enough oblique pulling angles in the two directions of the small car and the large car, so that the rolling reduction effect is good.

2. According to the gantry crane, the swing pulley and the swing driving mechanism are added on the basis of the anti-rolling mechanism, so that on one hand, the anti-rolling steel wire rope is always in a critical tensioning state to improve the anti-rolling effect, and on the other hand, multiple functions of left-right tilting, front-back tilting and rotation can be realized. Therefore, the gantry crane has the advantages of complete functions, simple structure and economic and reasonable arrangement.

Drawings

Fig. 1 is a schematic top view of a gantry crane according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a gantry crane according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a hoisting mechanism.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of a plurality of or a plurality of is two or more unless specifically limited otherwise.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for understanding and reading the contents disclosed in the specification, and are not used for limiting the conditions that the present application can implement, so the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the technical content disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.

Example (b):

as shown in fig. 1 and 2, the gantry crane of the present embodiment includes a spreader system, a trolley frame, and two pairs of roll stabilizing units, wherein a hoisting mechanism connecting the spreader system and the trolley frame is installed on the trolley frame.

As shown in fig. 3, the hoisting mechanism includes a hoisting drum, a hoisting rope wound on the hoisting drum, and two hoisting pulleys provided on the spreader system. Setting the axial direction of a lifting winding drum as an X direction, setting the direction of a horizontal plane vertical to the X direction as a Y direction, setting the lifting direction as a Z direction, and setting the X direction to be along the cart direction or the trolley direction; two lifting pulleys of the lifting mechanism are arranged at intervals along the Y-axis direction; two rope outlet ends of the lifting rope are fixed on the trolley frame after respectively bypassing the lifting pulleys with the rope outlet directions opposite to the rope outlet directions.

In this embodiment, hoisting mechanism still includes the first leading wheel with two play rope ends one-to-one, goes out the rope end and walks around corresponding first leading wheel in proper order, and play rope opposite direction's lifting pulley with oneself and be fixed in on the trolley frame. A lifting rope section between a lifting pulley and a trolley frame fixing point is set as a fixed section, two fixed sections of a lifting mechanism are positioned in different vertical planes, and the projections of the two fixed sections in the same Y-Z plane are arranged in a cross mode.

In addition, the lifting mechanism also comprises a lifting motor and a lifting speed reducer in transmission connection with the lifting motor, and the lifting speed reducer is in transmission connection with the lifting winding drum. Two sets of hoisting mechanisms are arranged, and the two sets of hoisting mechanisms are arranged at intervals along the X direction.

The anti-rolling unit comprises an anti-rolling winding drum, an anti-rolling rope wound on the anti-rolling winding drum and at least one guide pulley, wherein one end of the anti-rolling rope is fixed on the anti-rolling winding drum, and the other end of the anti-rolling rope is fixed on the lifting appliance system after sequentially bypassing the anti-rolling winding drum, one or more guide pulleys and the swinging pulley.

The anti-rolling winding drum is fixed on the lifting winding drum and is coaxially arranged with the lifting winding drum; the anti-rolling unit also comprises a swinging pulley, and an anti-rolling rope is connected with the lifting appliance system after being turned by the swinging pulley; the anti-rolling ropes between the swing pulleys and the hanger system are anti-rolling sections, the lengths of the four anti-rolling sections are equal, the anti-rolling sections of the two anti-rolling units in pairs are positioned in different vertical planes, and the projections of the two anti-rolling sections in the same X-Z plane are arranged in a cross way; the swing pulleys of the two stabilizing units in pairs are arranged at intervals along the X-axis direction, and the two pairs of stabilizing sections are arranged at intervals along the Y-axis direction.

Four swing driving mechanisms are arranged on the trolley frame, the swing driving mechanisms correspond to the swing pulleys one by one, and the swing driving mechanisms are used for driving the swing pulleys to take up or pay off ropes.

The swing driving mechanism can be an electric push rod, a hydraulic oil cylinder, a motor screw or a linear motor.

Referring specifically to fig. 1 and 2, the tilt roll reduction apparatus of the present invention includes, but is not limited to: the device comprises parts such as a lifting motor 53, a lifting speed reducer 52, a lifting reel 51, a lifting wire rope 55, a lifting wire rope 56, a lifting motor 63, a lifting speed reducer 62, a lifting reel 61, a lifting wire rope 65, a lifting wire rope 66, an anti-rolling reel 19, an anti-rolling reel 18, an anti-rolling reel 16, an anti-rolling reel 15, an anti-rolling wire rope 27, an anti-rolling wire rope 26, an anti-rolling wire rope 24, an anti-rolling wire rope 23, a swinging pulley 35, a swinging pulley 34, a swinging pulley 32, a swinging pulley 31, a swinging driving mechanism 43, a swinging driving mechanism 42, a swinging driving mechanism 40, a swinging driving mechanism 41 and the like. There may also be zero or more diverting pulleys 12. Specifically, a hoisting mechanism is arranged on the trolley frame 10 of the portal crane, and the hoisting mechanism comprises hoisting

motors

53 and 63, hoisting

speed reducers

52 and 62, hoisting

drums

51 and 61, hoisting

steel cables

55 and 56, 65 and 66 and the like. At the ends of the hoisting

drums

51 and 61 and the hoisting

reducers

51 and 62 are arranged the roll reduction drums 19 and 16, the roll reduction drums 18 and 15. The roll reducing cable 27 is fixed at one end to the roll reducing drum 19 and at the other end to the spreader system 68 by passing around zero or more diverting pulleys and then around the swinging pulley 35. The roll reducing cable 26 is secured at one end to the roll reducing drum 18 and at the other end to the spreader system 68 by passing around zero or more diverting pulleys and then around the swinging pulley 34. The roll reducing cable 24 is secured at one end to the roll reducing drum 16 and at the other end to the spreader system 68 by passing around zero or more diverting pulleys and then around the swinging pulley 32. The roll reducing wire 23 is fixed at one end to the roll reducing drum 15 and at the other end to the spreader system 68 by passing over zero or more diverting pulleys and over the swinging pulley 31.

Referring to fig. 2, the swing pulley 35 is connected to a swing driving mechanism 43, which may be, but not limited to, an electric push rod, a hydraulic cylinder, or other driving devices. A swing drive mechanism 42 is connected to the swing pulley 34, a swing drive mechanism 40 is connected to the swing pulley 32, and a swing drive mechanism 41 is connected to the swing pulley 31. The anti-rolling steel wire rope 27, the anti-rolling steel wire rope 24, the anti-rolling steel wire rope 26 and the anti-rolling steel wire rope 23 are arranged in a one-way crossing way (the same steel wire rope is crossed with an adjacent steel wire rope when viewed from the top in the air) after bypassing the swinging pulley 35, the swinging pulley 32, the swinging pulley 34 and the swinging pulley 31 and are fixed on a hanger system 68,

as shown in fig. 3, one end of each of the hoisting

cables

55 and 56 is fixed to the hoisting drum 51, and the other end thereof is wound around zero or more diverting pulleys, and then is wound around a pulley of the spreader system, and finally is fixed to the trolley frame 10. One end of each of the hoisting

cables

65 and 66 is fixed to the hoisting drum 61, and the other end thereof is wound around zero or more of the diverting pulleys, and then is wound around a pulley of the spreader system, and finally is fixed to the trolley frame 10.

When the crane hoisting mechanism hoists goods to ascend (or descend), the hoisting motor drives the hoisting drum to rotate to wind (or unwind) the rope, the anti-rolling drum rotates along with the hoisting drum so as to wind (or put down) the anti-rolling steel wire rope, the swing driving mechanism pushes the swing pulley to rotate, and therefore the length of the anti-rolling steel wire rope is adjusted, and the anti-rolling steel wire rope is in a critical tensioning state. When the lifting appliance system is shaken along the travelling direction of the trolley, the shaking of the lifting appliance system is inhibited due to the oblique pulling action of the lifting steel wire ropes 55 and 65 (or the lifting steel wire ropes 56 and 66), and the shaking reduction effect is realized in the travelling direction of the trolley. Similarly, when the spreader system swings in the traveling direction of the cart, the sway reducing wires 27 and 26 (or the sway reducing wires 23 and 24) suppress the sway, thereby achieving the sway reducing effect in the traveling direction of the cart.

When a crane spreader system grabs (or unloads) a container, the spreader system is required to have a tilting function due to the swing of a hull. In the invention, when the swing driving mechanisms 4226 and 4327 simultaneously take up ropes and the

swing driving mechanisms

41 and 40 simultaneously pay off the ropes (or 41 and 40 take up ropes and 42 and 43 pay off the ropes), the tilting of the hanger system along the left and right direction can be realized, and the tilting angle (generally +/-3 degrees) can be realized by the stroke of the swing driving mechanism. Similarly, when the

swing driving mechanisms

41 and 42 simultaneously take up the ropes and the

swing driving mechanisms

43 and 40 simultaneously pay off the ropes (or: 43 and 40 take up the ropes and 41 and 42 pay off the ropes), the tilting of the hanger system along the front and back directions can be realized. Similarly, when the

swing driving mechanisms

40 and 42 simultaneously take up the ropes and the

swing driving mechanisms

41 and 43 simultaneously pay off the ropes (or 41 and 43 take up the ropes and 40 and 42 pay off the ropes), the rotation of the spreader system can be realized.

In the invention, the number of times of reversely winding the pulley of the lifting steel wire rope is minimum, thereby ensuring the service life of the lifting steel wire rope. The steel wire rope has enough inclined pulling angles in both directions of the trolley and the cart, so that the steel wire rope has a good anti-rolling effect. The anti-rolling winding drum is directly driven by the hoisting mechanism, so that an anti-rolling driving mechanism is not needed, and the cost is greatly reduced. Through setting up swing pulley and swing actuating mechanism, can be on the one hand that the stabilizing wire rope is in critical tensioning state all the time, promote the stabilizing effect, on the other hand can realize inclining, tilting, gyration multiple functions around, around. In conclusion, the gantry crane has the advantages of complete functions, simple structure and economic and reasonable arrangement.

The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.

Claims

1. A gantry crane comprises a lifting appliance system, a trolley frame and two pairs of anti-rolling units, wherein a lifting mechanism for connecting the lifting appliance system and the trolley frame is arranged on the trolley frame and comprises a lifting winding drum; the anti-rolling unit comprises an anti-rolling winding drum and an anti-rolling rope wound on the anti-rolling winding drum, one end of the anti-rolling rope is fixed on the anti-rolling winding drum, the other end of the anti-rolling rope is fixed on the lifting appliance system, one of the cart direction and the trolley direction is set to be an X direction, the other of the cart direction and the trolley direction is set to be a Y direction, and the lifting direction is set to be a Z direction;

the device is characterized in that the anti-rolling winding drum is fixed on the lifting winding drum, and the anti-rolling winding drum and the lifting winding drum are coaxially arranged; the anti-rolling unit also comprises a swinging pulley, and the anti-rolling rope is connected with the lifting appliance system after being turned by the swinging pulley; the anti-rolling rope between the swing pulley and the hanger system is an anti-rolling section, the anti-rolling sections of the two anti-rolling units in pairs are positioned in different vertical planes, and the projections of the two anti-rolling sections in the same X-Z plane are arranged in a cross way; swing pulleys of the two paired anti-rolling units are arranged at intervals along the X-axis direction, and two pairs of anti-rolling sections are arranged at intervals along the Y-axis direction;

2. The gantry crane of claim 1, wherein the hoisting mechanism further comprises a hoisting rope wound on a hoisting drum, and two hoisting pulleys provided on the spreader system, the two hoisting pulleys of the hoisting mechanism being spaced apart in the Y-axis direction; two rope outlet ends of the rope are fixed on the trolley frame after respectively bypassing the lifting pulleys with the rope outlet directions opposite to the rope outlet directions of the rope outlet ends.

3. The gantry crane according to claim 2, wherein the hoisting mechanism further comprises first guide wheels corresponding to the two rope outlet ends one to one, and the rope outlet ends are fixed on the trolley frame after sequentially passing around the corresponding first guide wheels and hoisting pulleys in the opposite rope outlet directions.

4. A gantry crane according to claim 2, characterized in that the hoisting rope section from the hoisting pulley to the trolley frame fixing point is a fixed section, the two fixed sections of the hoisting mechanism are located in different vertical planes, and the projections of the two fixed sections in the same Y-Z plane are arranged in a cross manner.

5. The gantry crane of claim 2, wherein the hoisting mechanism further comprises a hoisting motor and a hoisting reducer in transmission connection with the hoisting motor, and the hoisting reducer is in transmission connection with the hoisting drum.

6. A gantry crane according to claim 2, wherein there are two sets of hoisting mechanisms, the two sets of hoisting mechanisms being spaced apart in the X-direction.

7. A gantry crane according to claim 6, wherein four anti-roll drums are provided at both ends of two hoisting drums.

8. A gantry crane according to any one of claims 1 to 7, wherein said swing drive mechanism comprises an electric push rod, a hydraulic ram, a motor screw or a linear motor.

9. A gantry crane according to any one of claims 1 to 7, wherein the four roll-reducing sections are all of equal length.

10. A gantry crane according to any one of claims 1-7, wherein said roll reduction unit further comprises at least one guide pulley, said roll reduction cable being wound in turn on a roll reduction drum, one or more guide pulleys, a swinging pulley.