CN110371861A - A kind of hydraulic towing lifting twin beams wirerope loop wheel machine - Google Patents

Abstract

The invention discloses a hydraulic towing and hoisting double-girder wire rope crane, which relates to the technical field of cranes. The invention includes two sets of cranes symmetrically arranged along the center line of the shield machine, each set of cranes includes a fixed bracket, a hoisting trolley, a running trolley, a hydraulic oil cylinder, a movable pulley block, a fixed pulley block, and a corner wheel; The machine is connected into a whole by a steel wire rope; a balance beam is arranged under the two hoisting trolleys through the wire rope. The invention realizes the hoisting of the crane by using the double-side hydraulic oil cylinder to synchronously drag the wire rope winding of the wire rope, and realizes the selection of the load of the spreader and the selection of the hydraulic oil cylinder through the number of times the wire rope is passed between the pulley blocks. Bearing the pulling force along the telescopic direction of the oil cylinder, the setting of the trolley pulley makes the headroom of the crane significantly larger, saves the headroom height, and meets the lifting requirements of more materials.

Description

A hydraulic tow lift double beam wire rope crane

technical field

The invention belongs to the technical field of cranes, and in particular relates to a hydraulic towing and lifting type double-girder wire rope crane.

Background technique

When the shield machine is working, it needs to continuously transport the prefabricated cement segment through the segment crane. At present, it serves the front section of the shield machine and is responsible for hoisting the cement prefabricated segments from the segment transfer platform. After horizontal movement, the hoist placed directly under the segment assembly machine mainly uses two chain hoists c, as shown in Figure 18 -20 shows:

Structurally, its main feature is that the chain hoist c is directly fixed under the hoisting trolley of the hoisting part b, the chain hoists c on the main beams on both sides are symmetrically arranged, and the lower hooks are hung at the end of the middle balance beam. The chain hoist c lifts and lowers the balance beam of the spreader synchronously to complete the hoisting of the segment. Since the tonnage of the chain hoist c is larger, the body in the width direction is wider, and it cannot be arranged in many working conditions, resulting in too narrow aisle on the side, or too little safety space left, and the chain hoist c is running during the operation. It is easy to wipe the bridge on the side, causing damage to the body. At the same time, the upper and lower dimensions of the hoist body and the chain box occupy most of the space, resulting in the loss of the size of the lifting clearance. Due to the limitation of the size of the chain hoist c itself, the maximum tonnage of the standard double vertical chain electric hoist can only reach 5 tons;

In the electronic control part, the chain hoist crane not only needs to provide the power supply and control of the running trolley a, but also the power supply and control of the chain hoist c. The number of cable cores increases, the wiring is complicated, and the fault point increases accordingly; as shown in Figure 18 As shown, the chain hoist crane needs 4 moving cables, and also needs to provide power supply and control to another chain hoist c, and the structure is relatively complicated.

To sum up, the existing chain hoist crane has the following disadvantages:

1. Large headroom and small lifting space;

2. The load is limited and the application range is narrow;

3. The electronic control is complex, the wiring is cumbersome, the cable reel is used for power supply, the number of cable cores is too many, and the cost is high;

4. The body is too wide, and it is difficult to arrange under certain conditions.

A hydraulic towing-lifting double-girder wire rope crane is provided to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hydraulic towing and hoisting double-girder wire rope crane. By arranging a trolley rail beam on both sides of the bridge, a set of hoisting machine and a running trolley are arranged on each side beam, and the pulley block is directly arranged on the On the hoisting trolley, the wire rope directly under the hoisting trolley is passed around the pulley fixed on the edge of the balance beam of the spreader, which effectively saves the hoisting clearance size.

In order to solve the above-mentioned technical problems, the present invention is achieved through the following technical solutions:

The present invention is a hydraulic towing and hoisting double-beam wire rope crane, comprising two sets of cranes symmetrically arranged along the center line of the shield machine, each set of the cranes includes a fixed bracket, a hoisting trolley, a running trolley, Hydraulic cylinder, movable pulley block, fixed pulley block, and corner wheel; each set of said fixed bracket, hoisting trolley, running trolley, hydraulic cylinder, movable pulley block, fixed pulley block, and corner wheel are connected by a wire rope; A balance beam is arranged below between the trolleys through the wire rope, and several trolley pulleys are installed on the hoisting trolley; A lifting sling is fixed below; the movable pulley group is slidably arranged on a running platform, and the movable pulley group includes a plurality of pulleys; the fixed pulley group includes a plurality of pulleys; the corner wheel is installed on the main The end of the beam; the hoisting trolley and the running trolley are sequentially arranged on the tracks on both sides of the belt conveyor in the front section of the shield machine; The hydraulic oil cylinder is fixedly installed on the bridge frame by bolts, and a limit mechanism is provided on one side of the hoisting trolley, and the limit mechanism is a cross limit structure. The whole set of components arranged on a straight line can be arranged on two straight lines with the corner wheel as the intersection point, so that each component can be arranged and installed in the very limited space of the shield machine bridge itself.

Further, three trolley pulleys are installed on the hoisting trolley, wherein two trolley pulleys are located on one side of the hoisting trolley, and the other trolley pulley is located on the other side of the hoisting trolley; the fixed pulley set includes two pulleys; The movable pulley group includes three pulleys; the balance beam is provided with two spreader pulleys; one end of the wire rope is fixed on the fixed bracket, and the steel wire rope passes through the trolley pulley, the spreader pulley is in the movable pulley block, the fixed pulley block After winding between them, fix the other end of the wire rope on the fixed pulley block. The setting of the trolley pulley on the hoisting trolley makes the clearance size of the hoist significantly larger to meet the lifting requirements of more materials.

Further, the winding method of the wire rope is as follows: before winding the wire rope, the hoisting trolley and the running trolley are run synchronously to the rear of the track beam, and the hydraulic oil cylinder pushes the movable pulley block to the position where the cylinder push rods are fully extended, and the hoisting and hoisting trolleys are fully extended. The tool and the balance beam are placed directly under the two hoisting trolleys; the wire rope is led out from the fixed end of the fixed bracket and enters the upper guide pulley of the double pulley side of the hoisting trolley, penetrates the inner side of the upper guide pulley of the front pulley, and passes through the lower part of the pulley, and passes through the positioning hole on the inner side of the spreader pulley. The center penetrates the outer side of the pulley, penetrates from the front of the single pulley side of the hoisting trolley to the rear, penetrates from the outer side of the spreader pulley to the inner side, and penetrates from the inner side of the rear pulley on the double pulley side of the hoisting trolley to the upper part and exits. The bottom of the corner pulley penetrates into the top and exits, from the bottom of the outermost pulley of the movable pulley block to the top, from the top of the outer pulley of the fixed pulley block to pass through the bottom, from the bottom of the middle pulley of the movable pulley block The top of the pulley passes in and out from the bottom, the bottom of the innermost pulley of the movable pulley is passed in and the upper is passed out, and the rope end of the wire rope is fixed on the wedge sleeve of the side plate of the fixed pulley block. Selection of spreader load and selection of hydraulic cylinders.

Further, the running platform is a rectangular plate, and the running platform is slidably installed between the two side plates of the movable pulley; A set of rollers are installed side by side on both sides, and the running platform is arranged between the rollers; the movable pulley set is hung upside down on the running platform or installed above the running platform through the rollers, and the running platform shares its own gravity of the movable pulley set, so that the hydraulic cylinder can only bear The pulling force along the extension direction of the cylinder.

Further, it also includes a control system of the crane, and the control system includes: an electric control box, the electric control box drives and controls the running trolley; wherein, the electric control box is controlled and connected with the control valve of the hydraulic cylinder; Manual operation and remote control, the manual operation and remote control are electrically connected with the electric control box, the electric control box is installed on one side of the running trolley, the electric control box is connected with the power supply, the electrical principle is simple, and there are few fault points. Easy to service.

The present invention has the following beneficial effects:

1. The present invention adopts the method of synchronously dragging the wire rope and the wire rope winding of the double-sided hydraulic cylinder to realize the lifting function of the crane, and realizes the selection of the load of the spreader and the selection of the hydraulic cylinder through the number of times the wire rope is passed between the pulley blocks. The gravity of the movable pulley block makes the oil cylinder only bear the pulling force along the extension direction of the oil cylinder.

2. The arrangement of the corner wheel in the present invention changes the direction of the wire rope. The whole set of components originally arranged on a straight line can be arranged on two straight lines with the corner wheel as the intersection point, so that each component can be arranged and installed on the shield machine. The bridge itself is very limited in space.

3. The arrangement of the pulley on the hoisting trolley in the present invention significantly increases the clearance size of the crane and saves the clearance height. The shield body of the same type can meet the lifting and transportation requirements of more materials.

Of course, it is not necessary for any product embodying the present invention to achieve all of the above-described advantages simultaneously.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of the hydraulic dragging and hoisting double-girder wire rope crane of the present invention;

Fig. 2 is the structural arrangement schematic diagram on the single side beam in the present invention;

Fig. 3 is the structural representation at A place in Fig. 2;

Fig. 4 is the structural representation at place B in Fig. 2;

Fig. 5 is the structural representation at C place in Fig. 2;

Fig. 6 is the structural representation of the balance beam in the present invention;

7 is a schematic structural diagram of a hydraulic tow-lift double-girder wire rope crane of the present invention;

Fig. 8 is the schematic diagram of the wire rope winding mode in the present invention;

9 is a schematic structural diagram of the installation of the movable pulley block in the present invention;

10 is a schematic structural diagram of the installation of the movable pulley block in the present invention;

Fig. 11 is the partial structure schematic diagram of the hydraulic towing and hoisting double-girder wire rope crane of the present invention;

12 is a schematic diagram of a specific installation structure of the present invention;

13 is a schematic diagram of a specific installation structure of the present invention;

Fig. 14 is the partial structure schematic diagram of the hydraulic towing and hoisting double-girder wire rope crane of the present invention;

Figure 15 is a schematic diagram of the present invention being installed in a shield machine;

16 is a schematic diagram of the headroom size saved by the present invention compared with a chain hoist crane;

17 is a schematic structural diagram of a control system of the present invention;

Figure 18 is a schematic structural diagram of the control system of the chain hoist crane;

Figure 19 is a schematic structural diagram of a chain hoist crane;

Figure 20 is a schematic diagram of the installation of the chain hoist crane in the shield machine;

In the accompanying drawings, the list of components represented by each number is as follows:

1-Fixed bracket, 2-Lifting trolley, 3-Electric control box, 4-Running trolley, 5-Hydraulic cylinder, 6-Moving pulley block, 7-Running platform, 8-Fixed pulley block, 9-Corner wheel, 10-Moving Lifting spreader, 11-balance beam, 12-wire rope, 13-prefabricated segment, 201-limiting mechanism, 701-support, a-running part, b-lifting part, c-ring chain hoist.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "rear", "upper", "lower", "front", "top", "middle", "length", "inner", "outer", " "Around", "side", "end", "side by side", "bottom", etc. indicate orientation or positional relationship, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have specific The orientation of the device is constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

See Figure 1-16:

The present invention is a hydraulic towing and hoisting double-beam wire rope crane, as shown in Figure 1, comprising two sets of cranes symmetrically arranged along the center line of the shield machine, each set of cranes includes a fixed bracket 1, a lifting trolley 2, running trolley 4, hydraulic cylinder 5, movable pulley block 6, fixed pulley block 8, corner wheel 9; each set of fixed brackets 1, lifting trolley 2, running trolley 4, hydraulic cylinder 5, movable pulley block 6, fixed pulley block 8 The corner wheel 9 is connected by a wire rope 12; the lower part between the two hoisting trolleys 2 is provided with a balance beam 11 through the wire rope 12, and both ends of the balance beam 11 are provided with a spreader pulley for the wire rope 12 to be wound around. , a lifting spreader 10 is fixed below the balance beam 11; the movable pulley group 6 is slidably arranged on a running platform 7; the corner wheel 9 is installed at the end of the main beam of the crane; On the rails on both sides of the belt conveyor in the front section of the shield machine; the hydraulic cylinder 5, the movable pulley block 6, the fixed pulley block 8, and the corner pulley 9 are arranged on the side wall of the bridge frame in turn, and the hydraulic cylinder 5 is fixed on the bridge frame by bolts. One side of 2 is provided with a limit mechanism 201, and the limit mechanism 201 is a cross limit structure. The setting of the trolley pulley on the hoisting trolley 2 makes the clearance size of the hoist significantly larger to meet the lifting requirements of more materials; The arrangement of the wheel 9 changes the direction of the wire rope 12. The whole set of components originally arranged on a straight line can be arranged on two straight lines with the corner wheel 9 as the intersection point, so that each component can be arranged and installed on the shield machine bridge itself. within a very limited space.

As shown in Figure 1-10, three trolley pulleys are installed on the hoisting trolley 2, two trolley pulleys are located on one side of the hoisting trolley 2, and the other trolley pulley is located on the other side of the hoisting trolley 2; 8 includes two pulleys; the movable pulley group 6 includes three pulleys; the balance beam 11 is provided with two spreader pulleys. As shown in FIG. 8 , the winding method of the wire rope 12 is as follows (only the wire rope winding method on one side is shown, and the two sides are symmetrical when winding): before winding the wire rope 12, the hoisting trolley 2 and the running trolley 4 are run synchronously to The forward direction of the shield at the rear end of the track beam, the right direction in Figure 1 is the forward direction, the hydraulic cylinder 5 pushes the movable pulley block 6 to the position where the cylinder push rods are fully extended, and the lifting spreader 10 and the balance beam 11 are placed on the two Right below the hoisting trolley 2; the wire rope 12 is led out from the fixed end of the fixed bracket 1 and enters into the hoisting trolley 2. The inner side of the upper guide pulley of the double pulley side of the front pulley penetrates the lower part of the pulley, and passes through the center of the positioning hole on the inner side of the spreader pulley. Passing out from the outside, passing through the front of the single pulley side of the hoisting trolley 2, passing through the rear, passing through the outside of the spreader pulley, passing through the inner side, passing through the inner side of the rear pulley on the double pulley side of the hoisting trolley 2, passing through the upper part, passing through the corner pulley 9. The bottom penetrates into the top and exits. The movable pulley group 6 penetrates into the top and the outer pulley. Passes through the fixed pulley block 8. The outer pulley penetrates into the bottom and exits. The inner pulley of the pulley block 8 penetrates into the bottom and exits, and the innermost pulley of the movable pulley block 6 penetrates into the upper part and passes out. The outer side and the lower side indicate the inner side. The selection of the load of the spreader and the selection of the hydraulic cylinder 5 are realized by the number of times of the wire rope 12 passing between the movable pulley block 6 and the fixed pulley block 8 .

As shown in Figures 9 and 10, the running platform 7 is a rectangular plate, and the running platform 7 is slidably installed between the two side plates of the movable pulley block 6; A group of rollers are installed side by side on the inner walls of the two side plates, and the running platform 7 is arranged between the rollers; the movable pulley group 6 is hung upside down on the running platform 7 through the rollers or installed above the running platform 7, and the running platform 7 shares the movable pulley group 6 itself gravity , so that the hydraulic cylinder 5 only bears the pulling force along the direction of the expansion and contraction of the cylinder.

As shown in FIG. 17 , the control system of the crane is also included. The control system includes: an electric control box 3 , which drives and controls the running trolley 4 ; wherein, the electric control box 3 is connected with the control valve of the hydraulic cylinder 5 for control. ; Manual operation, remote control, manual operation and remote control are electrically connected with the electric control box 3, the electric control box 3 is installed on the side of the running trolley 4, and the electric control box 3 is connected with the power supply, the electrical principle is simple, the fault points are few, and it is easy to overhaul.

A hydraulic towing and hoisting double-girder wire rope crane serves the front section of the shield machine and is responsible for hoisting the cement prefabricated segment 13 from the segment transfer platform, and after horizontal movement, it is placed directly under the segment assembling machine; A trolley track beam is arranged on each side beam, and a set of lifting trolley 2 and running trolley 4 are arranged on each side beam, as shown in Figure 11 (only one side crane is shown, and the two side cranes are arranged symmetrically). The pulley block is directly arranged on the hoisting trolley 2, and the wire rope 12 directly under the hoisting trolley 2 is passed around the spreader pulley fixed on the side of the spreader balance beam 11, which effectively saves the lifting clearance size. It can be clearly seen from the comparison in Figure 16 Seeing the saved headroom size, due to the limitation of the size of the chain hoist itself, the maximum tonnage of the standard double vertical chain electric hoist can only reach 5 tons, while the double beam wire rope hoist of the present invention is not limited by this, and only needs to increase The diameter of the large wire rope is 12, the diameter of the pulley is increased, and the high-power hydraulic cylinder 5 can be replaced. As shown in Figure 17, the broken line part is a mobile cable. The mobile power supply part only needs to provide power and control for the driving of the running trolley. The hydraulic cylinder 5 responsible for lifting is fixed on the bridge, and the cable is directly connected to the past to provide the oil valve. The control can be done, reducing the point of failure. Through the expansion and contraction of the hydraulic cylinder 5, the length of the wire rope 12 is changed, so that the lifting and lowering actions of the hoisting sling 10 are completed. The pulley of the trolley can run left and right in the full stroke. When running, the wire rope 12 enters from one side of the pulley and outputs from the other side. The total length of the wire rope 12 does not change, and the hoisting sling 10 can remain in the original position. The lifting mechanism and the running mechanism are relatively independent and do not interfere with each other.

Specific examples:

Taking the technical parameters - the parameters of a double-beam wire rope crane with a load of 10 tons/lifting 3 meters, for example, the load of the spreader is 10 tons, and the load of the single-side crane is 5 tons. Select a single wire rope with a force of 1.25 tons, the horizontal tension at the fixed end is 1.25 tons, and there are 4 wire ropes on one side of the spreader, so the load strength can reach 1.25*4=5 tons, complete the spreader and the small workshop. After the wire rope is wound, a single wire rope is output from the top of the other pulley on the double pulley side of the trolley. At this time, the tensile force that the wire rope needs to bear is still 1.25 tons, and then the wire rope first enters the movable pulley block, and the movable pulley block is completed in sequence as shown in Figure 8 The wire rope between the fixed pulley block and the fixed pulley block is finally fixed on the fixed pulley block. In this way, a total of 6 steel wire ropes on the movable pulley block are stressed, and the total tensile force on one side is 1.25*6=7.5 tons.

The spreader needs to be lifted by 3 meters. Since there are 4 ropes on the spreader, the distance that a single wire rope needs to move is 4*3=12 meters. There are 6 ropes in total between the movable pulley block and the fixed pulley block. The distance that the pulley block needs to move is 12/6=2 meters.

In summary, two hydraulic cylinders with a pulling force of 7.5 tons and a travel stroke of 2 meters were finally selected.

The purpose of increasing the winding between the movable pulley block and the fixed pulley block is to reduce the stroke of the hydraulic cylinder and increase the lifting speed; when working, the hydraulic cylinders on both sides extend at the same time, which drives the movable pulley block to approach the fixed pulley block and shortens the distance between the two pulley blocks. The distance between the pulleys becomes shorter, the wire rope is output to the right, the spreader falls, and vice versa, the spreader rises to complete the lifting work. A pulley block running platform is arranged on the movable pulley block. The movable pulley block is hung upside down under the platform and moves within the scope of the platform; the hydraulic cylinder only needs to bear the pulling force in the horizontal direction, and the gravity of the movable pulley block is borne by the small platform. The design of the corner wheel is mainly to turn the wire rope out of the rope, so that the fixed pulley, movable pulley and movable pulley can run the platform, and the hydraulic cylinder can be arranged on the side wall of the bridge above the track beam, saving space, reducing the length of the whole set of components, and the structure is compact , the required installation space is small, making room for the installation of other equipment; the optional range of equipment load capacity is large, which can meet the lifting requirements of heavier segments. This set of equipment can not only be used in shield machines, but also in other similar working conditions.

Preferably, the hoisting sling part selects a sling with two pulleys on each side. According to actual needs, different hoisting express and load capacity can be selected by increasing or decreasing the number of pulleys.

Preferably, 3 pulleys are used for the number of moving pulleys on one side, and 2 pulleys are used for fixed pulleys. According to actual needs, the hydraulic cylinder with corresponding pressure can be selected by increasing or decreasing the number of pulleys to meet the design requirements of different loads.

Preferably, the movable pulley running platform is arranged above the movable pulley block, and the movable pulley block is suspended under the platform with small rollers. According to actual needs, the movable pulley operating platform can also be arranged below the movable pulley block or other positions, and the functions achieved are the same. .

In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not exhaust all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (9)

1. A hydraulic tow-lifting type double-beam wire rope crane, characterized in that it comprises two sets of cranes symmetrically arranged along the shield machine center line, and each set of said cranes comprises a fixed bracket (1), a lift Lifting trolley (2), running trolley (4), hydraulic cylinder (5), movable pulley block (6), fixed pulley block (8), corner wheel (9); Each set of the fixed bracket (1), the lifting trolley (2), the running trolley (4), the hydraulic cylinder (5), the movable pulley block (6), the fixed pulley block (8), and the corner pulley (9) are connected by a steel wire rope (12) Unicom through and around; A balance beam (11) is arranged below between the two lifting trolleys (2) through a wire rope (12), and a plurality of trolley pulleys are installed on the lifting trolleys (2); Both ends of the balance beam (11) are provided with spreader pulleys for the wire rope (12) to pass through, and a lifting and spreader (10) is fixed below the balance beam (11); The movable pulley group (6) is slidably arranged on a running platform (7), and the movable pulley group (6) includes a plurality of pulleys; The fixed pulley group (8) includes several pulleys; The corner wheel (9) is installed at the end of the main beam of the crane; The lifting trolley (2) and the running trolley (4) are sequentially arranged on the tracks on both sides of the belt conveyor in the front section of the shield machine; the hydraulic oil cylinder (5), the movable pulley block (6), the fixed pulley block (8), the angle The wheels (9) are arranged on the side walls of the bridge in turn. 2. a kind of hydraulic towing lift type double girder wire rope crane according to claim 1, is characterized in that: Three trolley pulleys are installed on the hoisting trolley (2), two trolley pulleys are located on one side of the hoisting trolley (2), and the other trolley pulley is located on the other side of the hoisting trolley (2); The fixed pulley group (8) includes two pulleys; The movable pulley group (6) includes three pulleys; The balance beam (11) is provided with two spreader pulleys; One end of the wire rope (12) is fixed on the fixed bracket (1). The other end of (12) is fixed on the fixed pulley block (8). 3. A kind of hydraulic towing and hoisting double-beam wire rope crane according to claim 2, wherein the wire rope (12) is passed through and wound as follows: Before winding the wire rope (12), synchronously run the hoisting trolley (2) and the running trolley (4) to the rear of the track beam, and the hydraulic cylinder (5) pushes the movable pulley block (6) to the position where the cylinder push rod is fully extended , place the lifting spreader (10) and the balance beam (11) directly below the two lifting trolleys (2); The steel wire rope (12) is led out from the fixed end of the fixed bracket (1), and enters the hoisting trolley. Passing out, passing through the front of the single pulley side of the lifting trolley (2), passing through the rear, passing through the outer side of the spreader pulley, passing through the inner side, passing through the inner side of the rear pulley on the double pulley side of the hoisting trolley (2), passing through the upper part, From the bottom of the corner pulley (9) to the top and out, from the bottom of the outermost pulley of the movable pulley group (6) to the top and out, from the top of the outer pulley of the fixed pulley block (8) to the bottom and out, and from the movable pulley block (6) The lower part of the middle pulley penetrates into the upper part, the upper part of the inner pulley of the fixed pulley block (8) penetrates into the lower part, the lower part of the innermost pulley of the movable pulley block (6) penetrates into the upper part, and the rope end of the steel wire rope (12) is fixed on the fixed pulley block (6). on the wedge sleeve of the side plate of the pulley block (8). 4. A hydraulic towing and hoisting double-girder wire rope crane according to claim 1, characterized in that the operating platform (7) is a rectangular plate, and the operating platform (7) is slidably installed on the moving platform. between the two side plates of the pulley block (6); the running platform (7) is mounted on the bridge frame through a T-shaped support (701). 5. a kind of hydraulic towing lift type double girder wire rope crane according to claim 4 is characterized in that: A set of rollers are installed side by side on the inner walls of the two side plates of the movable pulley group (6), and the running platform (7) is arranged between the rollers; The movable pulley group (6) is hung upside down on the running platform (7) or installed above the running platform (7) through rollers. 6. The hydraulic tow-lift double-girder wire rope crane according to claim 1, further comprising a control system of the crane, the control system comprising: an electric control box (3), the electric control box (3) drives and controls the running trolley (4); Wherein, the electric control box (3) is controlled and connected with the control valve of the hydraulic cylinder (5); A manual operation and a remote control are provided, and the manual operation and the remote control are electrically connected with the electric control box (3). 7. A hydraulic towing and hoisting double-girder wire rope crane according to claim 6, characterized in that the electric control box (3) is installed on one side of the running trolley (4), and the electric control box (3) Connect to the power supply. 8 . The hydraulic towing and hoisting double-girder wire rope crane according to claim 1 , wherein the hydraulic cylinder ( 5 ) is fixedly installed on the bridge frame by means of bolts. 9 . 9 . The hydraulic towing and hoisting double-girder wire rope crane according to claim 1 , wherein a limit mechanism ( 201 ) is provided on one side of the hoisting trolley ( 2 ), and the limit The mechanism (201) is a cross limiting structure.