JPH07144885A - Crane boom assembly - Google Patents

Abstract

(57) [Summary] [Purpose] The work of projecting and storing the main rope is facilitated and workability is greatly improved. [Structure] Connection pipe 1 located above intermediate boom 8
The tube 32 of the stay cylinder 31 is attached to the 7, 17 and the reinforcing pipe 18, the proximal end side is inserted into the tube 32, and is fixed to the piston in the tube 32, and the distal end side projects outside the tube 32, and the distal end thereof is provided. A rod 36 provided with a mooring ring 36A for mooring the master rope 25 is provided as a stay. Then, by supplying / discharging pressure oil to / from each stay cylinder 31 via hydraulic pipes 42, 43 and supply / discharge pipes 38, 39, etc., the rod 36 as a stay is advanced from the tube 32, and the master rope 25 is extended. Position in position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane boom assembly suitably used in, for example, a crawler type crane, a tower crane, etc. The present invention relates to a crane boom assembly that can be assembled.

[0002]

5 to 10 show a crawler type crane provided with a crane boom assembly of the prior art.

In the drawing, 1 is a lower traveling body, 2 is an upper revolving body which constitutes a crane main body provided on the lower traveling body 1 so as to be rotatable, and the upper revolving body 2 has an A-shaped frame 3 and With the counter weight 4 etc.,
A hoisting drum 5 and a boom / elevation drum (not shown) are provided.

Reference numeral 6 denotes a crane boom assembly which is provided on the front part of the upper swing body 2 so as to be able to move up and down. The crane boom assembly 6 is rotatably attached to the front part of the upper swing body 2. Of the intermediate booms 8, the lower boom 7 and, for example, three intermediate booms 8, 8, ... Which are integrally connected to the tip end side of the lower boom 7 via a connecting pin (not shown) or the like. The upper boom 9 is connected to the intermediate boom 8 on the front end side via a connecting pin or the like, and the sheave 11 for the hoisting rope 10 is attached to the front end side of the upper boom 9. Then, the hoisting rope 10 is hoisted by the hoisting drum 5,
The hook 12 is wound down, and the hook 12 is moved up and down from the lower side of the sheave 11.

Reference numeral 13 denotes a depression / elevation rope which is fed out from the boom / elevation drum of the upper revolving structure 2 through the A-shaped frame 3 and is inserted therein. The front end side of the pendant rope 15 is connected to the front end side of the upper boom 9. The crane boom assembly 6 is lifted upward through the pendant rope 15 when the boom raising / lowering rope 13 is fed by the boom raising / lowering drum, and the crane boom assembly 6 is lowered when feeding the downward raising / lowering rope 13. Be moved to. The pendant rope 15 is divided into a plurality of pendant ropes 15, 15, ... When the crane boom assembly 6 is disassembled as shown in FIG. 6 and FIG. (Not shown) or the like.

Next, the intermediate boom 8 of the crane boom assembly 6 will be described in detail with reference to FIGS.

In the figure, 16, 16, ... Are long frame pipes 17, 17 which are spaced apart from each other at the top, bottom, left and right and extend in the front-rear direction.
7, ... Are provided at both ends of each frame pipe 16
The connecting pipes connecting the two are shown, and each connecting pipe 17 forms a quadrangular frame structure together with each frame pipe 16 and constitutes a frame body of the intermediate boom 8.

Reference numerals 18, 18, ... Indicate reinforcing pipes obliquely joined between the frame pipes 16. The reinforcing pipes 18 together with the front and rear connecting pipes 17 are substantially triangular trusses between the frame pipes 16. The frame pipes 16 and the connecting pipes 17 have a structure to increase the bending strength and the torsional strength. Further, other reinforcing pipes 19, 19 for obliquely connecting the upper and lower frame pipes 16, 16 are provided on both ends of each frame pipe 16, and each reinforcing pipe 19 is a front and rear connecting pipe. It extends in the diagonal direction of 17.

Reference numerals 20 and 21 denote connecting fittings joined to the front and rear ends of the frame pipe 16. The connecting fittings 20 and 21 are provided at both ends of the frame pipe 16, respectively, and connect the intermediate booms 8 to each other. At this time, the connecting fitting 20 is inserted into the bifurcated connecting fitting 21 and the two are joined by a connecting pin or the like. In addition, the tip side of the lower boom 7 and the upper boom 9
As shown in FIG. 7, a similar coupling fitting 20 (2
1) is provided by being joined.

22 are connected to the upper connecting pipe 17,
17 and a bracket attached to the reinforcing pipe 18, each bracket 22 is composed of a tightening metal fitting 22A, a holder 22B and the like.
Alternatively, the reinforcing pipe 18 is attached by being fastened to the middle portion in the longitudinal direction via a nut 23 or the like. The holder 22B of each bracket 22 holds each stay 24 described later slidably up and down, and allows each stay 24 to move up and down from the intermediate boom 8 as shown in FIGS. It has become.

Reference numerals 24, 24, ... Show stays slidably held by the holders 22B of the brackets 22. The stays 24 are formed from a small-diameter pipe material with a predetermined length and are provided on the upper end side which is the tip end side. An anchoring ring 24A for anchoring the master rope 25 is provided. Further, each stay 24 is formed with a pair of pin holes 24B and 24C at predetermined intervals in the vertical direction.
Positioning pins 26 are selectively attached to B and 24C. The positioning pins 26 are mounted in the lower pin holes 24C when the stays 24 are projected upward from the intermediate boom 8 as shown in FIG.
Is positioned on each holder 22B at the projecting position shown in FIG.

Further, when lowering each stay 24 to the storage position shown in FIG. 10, each positioning pin 26 is pulled out from each pin hole 24C, and each stay 24 is lowered into the intermediate boom 8 by its own weight. Each positioning pin 26 is mounted in each pin hole 24B. Then, at this time, each positioning pin 26 is engaged with the lower end side of each holder 22B to hold each stay 24 at the storage position. On the other hand, the master rope 25 is inserted into the mooring ring 24A of the middle stay 24 among the stays 24 shown in FIGS. 9 and 10, and both ends thereof are connected to the mooring rings 24A of the stays 24 on both sides via the fasteners 25A and 25A. Attachment (hanging)
Has been done.

Reference numeral 27 denotes an upper plate of the intermediate boom 8 which is a bridge plate bridged between the front and rear connecting pipes 17, 17. The bridge plate 27 is detachable for an operator to walk on the intermediate boom 8. It is provided for the convenience of disassembling and assembling the crane boom assembly 6 as described later. Here, the intermediate boom 8 has a height dimension H of 2 to 3 m as shown in FIG. 6, and the work on the bridge plate 27 is performed at a high place. Therefore, the worker hooks a lifeline (not shown) on the master line 25 when climbing on the bridge 27 so as to ensure safety in high-place work.

In the prior art thus constructed, the crane boom assembly 6 has a total length of 10 m or more, and therefore, when the crane boom assembly 6 is transported to the work site, the intermediate boom 8 and the upper boom 9 are transported in a disassembled state. I am trying. At the work site, the intermediate boom 8 and the upper boom 9 are assembled before the crane work as shown in FIGS.

In this case, first, with each stay 24 provided on each intermediate boom 8 stored in the storage position shown in FIG.
The pendant ropes 15 are placed on the respective intermediate booms 8 as shown in FIG. Then, in this state, the intermediate boom 8 is lifted by a small auxiliary crane (not shown) via the hook 28, the wire 29, etc., and is placed at a desired position.

Next, in a state where the intermediate boom 8 is grounded at the site, each stay 24 is raised to the extended position shown in FIG.
As shown in FIG. 8, each stay 24 is projected on the intermediate boom 8 with a predetermined height, and a bridge 27 is bridged over the intermediate boom 8. An operator climbing the bridge 27 attaches a lifeline. It is hooked on the main rope 25 so that the subsequent assembling work can be performed safely. Then, in this state, as shown in FIG. 6, the next intermediate boom 8 is hoisted via the hook 28 and the wire 29 of the auxiliary crane, and is transferred to the position of the intermediate boom 8 which was previously grounded. At this time, the connecting fitting 21 of the next intermediate boom 8 is inserted into the connecting fitting 20 of the previous intermediate boom 8 from the direction of arrow A,
In the inserted state, both are integrally connected with a connecting pin.

In this case, the connecting fittings 20 and 21 located on the lower side in FIG. 6 can be pin-connected by working from the ground. However, the upper coupling fittings 20, 21
The connecting work of the intermediate boom 8 (the bridge 2
7) It is necessary for the worker to climb onto the top of the above 7) and to securely connect the connecting fittings 20 and 21 with the connecting pin while the life rope is hooked on the master rope 25. Even when the two intermediate booms 8 and 8 are connected, each stay 24 is placed in the extended position as shown in FIGS. 8 and 9 so that the life rope can be hooked on the master rope 25, and then The next intermediate boom 8 is connected in the same manner as described above.

Next, as shown in FIG. 7, with the upper boom 9 connected to the tip end side of the intermediate boom 8, these assemblies are hoisted by the hooks 28 of the auxiliary crane and attached to the upper swing body 2 in advance. It is transferred to the tip side of the lower boom 7, and the connecting metal fittings 21 (20) provided on the base end side of the intermediate boom 8 are inserted into the connecting metal fittings 20 (21) of the lower boom 7 to connect them with a connecting pin. . Also, the pendant ropes 15 placed on the respective intermediate booms 8 are connected to each other by metal fittings or the like. And the work at this time is also the middle boom
The safety rope of the assembling work is secured by hooking the life rope on the master rope 25 protruding above each stay 24. Also, when the crane boom assembly 6 is disassembled again after the crane work is completed, it is carried out in substantially the same manner as the above-described assembly, and when the disassembly / assembly work is completed, the intermediate boom 8
Each stay 24 is stored in the storage position illustrated in FIG.

[0019]

By the way, in the above-mentioned prior art, in order to project the master rope 25 on each intermediate boom 8, each stay in which the master rope 25 is connected to the mooring ring 24A on the upper end side is connected. 24 is slidably provided on the intermediate boom 8 via the brackets 22. The stays 24 are formed with pin holes 24B and 24C at predetermined intervals on the upper and lower sides thereof, and the pin holes 24B and 24C are respectively positioned. By selectively mounting the pins 26, the stays 24 are positioned by manually sliding them to the extended position shown in FIG. 9 and the storage position shown in FIG.

Therefore, in the prior art, when disassembling and assembling the crane boom assembly 6 at the site,
The operator climbs on the intermediate boom 8 and pulls out the positioning pin 26 from each stay 24 at the storage position in FIG. 10, for example.
The pin holes 2 of each stay 24 are positioned so that each stay 24 is positioned at the projecting position shown in FIG. 9 while projecting from the intermediate boom 8 by pulling each stay 24 upward.
It is necessary to attach each positioning pin 26 to 4C, and a great amount of labor and time are required for the work of overhanging and storing each stay 24 from the intermediate boom 8, resulting in very poor workability. There is.

The present invention has been made in view of the above-mentioned problems of the prior art, and according to the present invention, each stay for extending the master rope from the intermediate boom can be easily changed between the storage position and the extension position. The purpose of the present invention is to provide a crane boom assembly capable of greatly improving workability during disassembly and assembly.

[0022]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a lower boom attached to a crane body, an upper boom to which a sheave for a hoisting rope is attached on the tip side, and an upper boom. In a crane boom assembly including an intermediate boom detachably provided between the lower boom and the lower boom, the intermediate boom is attached to the intermediate boom at a distance from each other in the longitudinal direction of the intermediate boom to supply and discharge the pressure fluid from the outside. Thus, a plurality of stay cylinders for advancing and retracting the rods that become stays are provided, and a master rope is provided at the rod tip end side of each stay cylinder.

[0023]

With the above structure, in disassembling and assembling the crane boom assembly, if pressure fluid is supplied from the outside to each stay cylinder, the rod used as a stay advances so as to project from each stay cylinder, The master rope provided on the tip side of each rod can be automatically extended from the intermediate boom. Further, when the pressure fluid is discharged from each stay cylinder, the rod can be retracted into each stay cylinder, and the master rope can be automatically stored in the intermediate boom.

[0024]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the prior art shown in FIGS. 5 to 10 are designated by the same reference numerals and the description thereof will be omitted.

Denoted by 31, 31, ... are a plurality of stay cylinders spaced apart in the lengthwise direction of each intermediate boom 8.
Each stay cylinder 31 is composed of a hydraulic cylinder device including a tube 32, a rod 36, a piston 37, and the like, which will be described later.

32, 32, ... are upper connecting pipes 17,
The tubes attached to the reinforcement pipe 17 and the reinforcing pipe 18 are shown. Each of the tubes 32 is formed in a cylindrical shape with a bottom, and a mounting plate 33 is fixed to the tip end side by welding or the like.
Then, the tightening metal fittings 34 are inserted into the respective mounting plates 33, and the nuts 35 are respectively attached to the front ends of the respective tightening metal fittings 34.
Each tube 32 is connected to the connecting pipe 1 by tightening etc.
7 or the reinforcing pipe 18 is fixed to the middle portion in the length direction.

The tubes 36, 36, ... Have proximal ends.
The rods are inserted into the rods 32 and the ends thereof extend outside the tube 32 to form stays, and anchoring rings 36A for anchoring the master rope 25 are provided on the distal ends of the rods 36. Further, as shown in FIG. 3, pistons 37 are fixed to the proximal ends of the rods 36, and the rods 36 are extended by sliding displacement of the pistons 37 in the tube 32.
The tube 32 is contracted, and is advanced and retracted from the tip end side of each tube 32.

Here, the piston 37 defines the inside of the tube 32 into two oil chambers A and B, as shown in FIG. Further, supply / discharge ports 32A, 32B communicating with the oil chambers A, B are formed on both axial ends of the tube 32, and the supply / discharge ports 32A, 32B extend axially outside the tube 32. One ends of the supply / discharge pipes 38, 39 are connected to each other. Further, the supply / discharge pipe 38,
Hydraulic pipes 42, 43 described later are attached to the other end of 39 via joints 40, 41.

When the pressure oil from each hydraulic pipe 43 is supplied to the oil chamber B in the tube 32 from the supply / discharge port 32B via the supply / discharge pipe 39, the piston 37 is moved to the oil chamber A side. Since the tube 32 is slidably displaced toward the tip end side, the rod 36 extends upward and holds the master rope 25 in the extended position as shown in FIG.

On the other hand, high-pressure pressure oil is supplied into each hydraulic pipe 42, and this pressure oil is supplied to the supply / discharge port 3 via the supply / discharge pipe 38.
When the oil is supplied from 2A to the oil chamber A in the tube 32, the piston 37 is slidably displaced toward the oil chamber B side toward the base end side (bottom side) of the tube 32. The main rope 25 is contracted inward and held in the storage position shown in FIG.

The hydraulic pipes 42, 42, ... Are connected to the supply / discharge pipes 38 of the tubes 32 via the joints 40, 43, 43, ... are arranged in parallel with the hydraulic pipes 42, and Another hydraulic pipe connected to the supply / discharge pipe 39 of the tube 32 via each joint 41 is shown. The hydraulic pipes 42 and 43 are the oil chambers A of all the stay cylinders 31 attached to the intermediate boom 8. , B are connected between the stay cylinders 31 so that pressure oil is supplied to and discharged from the stay cylinders B.

.., 45, 45, ... Denote couplings provided at both ends of each intermediate boom 8 and provided at the end portions of the respective hydraulic pipes 42, 43. Reference numeral 45 denotes a built-in check valve, which is normally closed to prevent pressure oil in the hydraulic pipes 42 and 43 from flowing out to the outside, and as shown in FIG. 1, FIG. 2 and FIG.
When connected to the hydraulic pipes 42, 43, etc., the pressure oil is allowed to flow before and after the couplings 44, 45.

Reference numeral 46 denotes a hydraulic pump provided in a machine room in the upper swing body 2. The hydraulic pump 46 constitutes a pressure source for each stay cylinder 31 together with the tank 47 as shown in FIG. The pump 46 and the tank 47 are connected to each stay cylinder 31 via a pair of pipelines 48 and 49.

Reference numeral 50 designates a directional control valve provided in the middle of the pipelines 48, 49. The directional control valve 50 is operated from the neutral position (a) to the switching position (b) by an operating lever 50A provided in the driver's cab. The operation is switched to (C).

51 indicates an overload relief valve,
The relief valve 51 prevents excessive pressure from acting on the hydraulic pump 46 and the like.

Reference numerals 52 and 53 denote couplings provided on the tip ends of the pipe lines 48 and 49, respectively.
3 is detachably connected to couplings 44 and 45 provided in the hydraulic pipes 42 and 43 of each intermediate boom 8.

The crane boom assembly according to this embodiment has the above-mentioned structure, and its basic operation is not different from that of the prior art.

Therefore, the operation of projecting or storing the master rope 25, which is a feature of this embodiment, will be described with reference to FIG.

First, the hydraulic pipes 42, 43 of the intermediate boom 8
Is connected to the conduits 48, 49 on the upper revolving structure 2 side via mutual couplings 44, 45 and couplings 52, 53. When connecting another intermediate boom 8 to this intermediate boom 8, the hydraulic pipes 42 and 43 are connected via mutual couplings 44 and 45, respectively.

Next, when the master rope 25 is extended onto the intermediate boom 8, the hydraulic pump 46 is driven and the operation lever 50A in the operator's cab is operated to move the direction switching valve 50 from the neutral position (a). By switching to the switching position (b), the hydraulic pump 4
The pressure oil, which is the pressure fluid from 6, is the conduit 49, each hydraulic pipe 4
The oil is supplied to the oil chamber B via the supply / discharge pipes 39 provided in the tube 32 of the stay cylinder 31 and the stay cylinder 31. As a result, each rod 36 extends upward from the tube 32, reaches the extended position shown in FIG. 1 and projects onto the intermediate boom 8, and the master rope 25 is extended to a predetermined height position.

The rod 36 protruding to the projecting position in this way is pressurized oil in the oil chambers A and B even when the direction switching valve 50 is returned from the switching position (b) to the neutral position (a). When the intermediate boom 8 illustrated in FIGS. 6 and 7 is disassembled and assembled in this state, the life rope is fixed at the overhanging position, and the life rope 25 at the predetermined height position is used during this work.
It can be securely hooked to, and it is possible to secure safety when working in high places.

On the other hand, when the master rope 25 is stored in the intermediate boom 8, the operation lever 50A in the driver's cab is operated to switch the direction switching valve 50 from the neutral position (a) to the switching position (c). Pressure oil is supplied from the hydraulic pump 46 to the oil chamber A through the pipe line 48, the hydraulic pipes 42, the supply / discharge pipes 38 provided in the tubes 32 of the stay cylinders 31, and the like. This allows each rod 36 to shrink into the tube 32 and return the master rope 25 to the storage position shown in FIG.

The intermediate booms 8 are disassembled and the main rope 25 is disassembled.
After storing each coupling 44, 45, 52, 5
When removing 3 etc., each coupling 44, 45, 5
The check valves built in 2, 53 can prevent the pressure oil in each stay cylinder 31, the hydraulic pipes 42, 43, and the pipelines 48, 49 from flowing out, and store each rod 36. It can be held fixed in position.

Thus, according to the present embodiment, each intermediate boom 8 is provided with a plurality of stay cylinders 31, 31, ..., And the rod 36 which becomes the stay of each stay cylinder 31 is expanded and contracted by the supply and discharge of pressure oil. Therefore, by supplying / discharging the pressure oil from the hydraulic pump 46 to / from each stay cylinder 31, the respective rods 36 are advanced and retracted, and the main rope 2
5 can be selectively positioned between the extended position shown in FIG. 1 and the retracted position shown in FIG. 2, and each rod 36 can be extended or retracted without using the pins 26 or the like as in the prior art. Can be easily fixed in position.

As a result, when disassembling and assembling the crane boom assembly, each rod 36 and master rope 25 can be easily extended and stored by simply operating the operation lever 50A from the cab. Therefore, it is not necessary to climb on each of the intermediate booms 8 as in the prior art.

Before connecting the plurality of intermediate booms 8, the hydraulic pipes 42 and 43 of each intermediate boom 8 are connected to supply and discharge the pressure oil from the hydraulic pump 46. Since all the arranged rods 36 can be projected to the projecting position at the same time, each rod 36
Further, the work of projecting and storing the master rope 25 can be performed instantaneously, and the work time can be greatly shortened.

Therefore, the workability of disassembling / assembling work of the crane boom assembly 6 can be greatly improved without spending extra labor and time for projecting and storing the master rope 25 as in the prior art. it can.

In the above embodiment, the stay cylinder 3
1 is constituted by a hydraulic cylinder device, and a hydraulic pump 46
However, the present invention is not limited to this, and the stay cylinder is configured by a pneumatic cylinder device, and air is supplied from the outside by an air compressor or the like to advance the rod. You may make it retire.

In the above embodiment, the crawler type crane has been described as an example, but the present invention is not limited to this and can be applied to, for example, a tower crane.

[0050]

As described above in detail, according to the present invention, the intermediate boom is provided with a plurality of stay cylinders which are spaced apart from each other in the lengthwise direction of the intermediate boom, and the stay cylinders have parent rods on the rod tip side. Since the rope is configured, each rod can be easily extended and stored on the intermediate boom together with the parent rope simply by supplying / discharging pressure fluid to / from each stay cylinder from the outside, greatly improving workability. In addition, it is possible to ensure safety during work and save labor for disassembling and assembling the crane boom assembly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an intermediate boom, a stay cylinder and the like of a crane assembly according to an embodiment of the present invention in a projecting position of a main rope.

FIG. 2 is a vertical cross-sectional view of the same position as in FIG. 1 showing the storage position of the master rope in which each rod is contracted into the tube.

FIG. 3 is an enlarged cross-sectional view of the stay cylinder shown in FIG.

FIG. 4 is a hydraulic circuit diagram showing each stay cylinder, a hydraulic pump, and the like.

FIG. 5 is an overall view showing a crawler type crane according to the prior art.

6 is an explanatory view showing an assembled state of each intermediate boom shown in FIG. 5. FIG.

FIG. 7 is an explanatory diagram showing a state in which each intermediate boom to which the upper boom is attached is attached to the lower boom.

FIG. 8 is a perspective view of an intermediate boom.

9 is an enlarged cross-sectional view taken along arrow IX-IX in FIG.

FIG. 10 is a cross-sectional view of the same position as FIG. 9 showing a state where each stay is stored in the intermediate boom.

[Explanation of symbols]

 1 Lower Traveling Body 2 Upper Revolving Structure (Crane Main Body) 6 Crane Boom Assembly 7 Lower Boom 8 Middle Boom 9 Upper Boom 10 Hoisting Rope 11 Sheave 13 Depression Rope 15 Pendant Rope 16 Frame Pipe 17 Connecting Pipe 18 Reinforcement Pipe 25 Parent Rope 31 stay cylinder (cylinder device) 32 tube 36 rod (stay)

Claims (1)

[Claims] 1. A lower boom attached to a crane main body, an upper boom to which a sheave for a hoisting rope is attached at a tip side, and an intermediate boom detachably provided between the upper boom and the lower boom. In the crane boom assembly, a plurality of stay cylinders, which are attached to the intermediate boom so as to be spaced apart from each other in the length direction of the intermediate boom, and which advance and retract a rod serving as a stay by supplying and discharging a pressure fluid from the outside. A crane boom assembly, characterized in that a main rope is provided on the rod tip side of each stay cylinder.