JPH0415756Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a crane device with a jib, in which the jib is attached to a telescopic boom that is attached to a base so as to be able to freely pivot in the vertical direction. It is related to.

(Prior art) In recent years, as buildings have become taller, there has been a demand for higher lifts and wider working capacity for crane devices, especially mobile crane devices, used for unloading construction materials at construction sites. Against this background, crane devices with jibs have been increasingly used in recent years.

By the way, when performing crane work using such a crane device with a jib, for example, at a work site where there are obstacles such as power lines or other structures, it is necessary to perform crane work while changing the tilt angle (elevation angle) of the jib. There are things that need to be done. In that case, with a jib-equipped crane device that uses a conventional fixed tilt jib, each time it is necessary to change the tilt angle of the jib, the tip of the telescoping boom is lowered close to the ground and the tilt angle of the jib is adjusted to a predetermined angle. There was a problem that the adjustment work was troublesome.

Further, in order to improve the problems of the fixed tilt jib, a crane device with a jib having a variable tilt angle jib as shown in FIG. 6 has been developed.

The conventional jib-equipped crane device shown in FIG.
The jib 104 is pivotally attached to the telescopic boom so as to be able to pivot vertically within the locus of the up-and-down movement of the telescopic boom, and between the tip 171a of the mast 171 attached to the tip 133a of the telescopic boom and the tip 104a of the jib 104. Connected by a tension rod 105 of a predetermined length,
Furthermore, the jib 104 is supported by connecting a wire rope 117 of a winch device 107 provided on the swivel table 102 to the tip 171a of the mast 171. In this jib-equipped crane device, the jib 104 is raised and lowered by winding and unwinding operations of the winch device 107, thereby ensuring a higher lift and an expanded working area.

However, in a telescopic boom type crane device in which the tilt angle of the jib 104 is controlled by the winch device 107 on the swivel base 102 as shown in FIG. If 107 is not operated, the tilt angle of the jib 104 with respect to the telescopic boom 103 will change, causing the jib 104 to rotate excessively upward (when the telescopic boom is extended) or downward (when the telescopic boom is retracted). This may cause problems such as
When the telescopic boom is extended or retracted, the winch device 107 must be reeled in or retracted at the same time to correct the tilt angle of the jib 104, and there is a problem in that the operation for this purpose (operation of the winch device) is troublesome. Ta.

Also, among the known crane devices with jib, there is one as shown in Fig.
-100390). In the known jib-equipped crane device shown in FIG. 7, a jib 204 pivotally attached to a tip end 233a of a telescoping boom 203 is pivoted up and down by a hydraulic cylinder 206. That is, the hydraulic cylinder 204 is installed near the base end of the jib, and the rope 251 connected to the cylinder rod of the hydraulic cylinder 204 is connected to the jib 20.
A mast 243 provided on the boom tip 233a side via two sheaves 241 and 242 provided on the 4th side.
is connected to. In the jib-equipped crane device shown in FIG. 7, the tilt angle of the jib 204 can be changed by extending or contracting the hydraulic cylinder 206 from the ground and loosening or pulling the rope 251. . In the crane device with a jib shown in FIG. 7, even if the telescopic boom 203 is extended or contracted, the tilt angle of the jib does not change as in the crane device shown in FIG. 6.

However, in the crane device with a jib shown in FIG. 7, although the tilt angle of the jib 204 can be changed from the ground and the tilt angle of the jib does not change even when the telescopic boom 203 is extended or retracted, it is difficult to support the jib 204. The rope 251 connected to the cylinder rod of the hydraulic cylinder 206 is connected to the two sheaves 24.
1,242 and then connected to the mast 243, each sheave 241, 242 is required, and each time the jib 204 is attached to or detached from the telescopic boom tip 233a, the rope 251 is attached to the mast 243. There was a problem in that it was necessary to wind and unwind the sheaves around each sheave 241, 242, which made these operations troublesome.

Note that with this type of jib-equipped crane equipment, there are cases where the jib is removed and crane work is performed using only the telescopic boom. In that case, remove the jib support device, remove the jib from the tip of the telescopic boom, Store the jib along the proximal boom.

(Purpose of the invention) In view of the above-mentioned problems with conventional jib-equipped crane devices, the present invention enables the tilt angle of the jib to be adjusted from the ground; Even if the telescopic boom is extended or retracted, the tilt angle of the jib should not change when the telescopic boom moves, and the jib support device must be installed when the jib is installed or removed from the tip of the telescopic boom. - It is an object of the present invention to provide a crane device with a jib that can be easily removed and the structure of the jib support device can be simplified.

(Means for Achieving the Object) The present invention has a jib attached to the tip of a telescoping boom which is attached to a base so that it can be raised and lowered and whose tip boom is telescopically connected to the boom on the base side. The telescopic boom is pivotally attached to the telescopic boom in such a manner that it can pivot vertically and detachably within the plane of the up-and-down locus, and furthermore, a jib support device is interposed between the tip of the telescopic boom and the jib to support the jib. In the crane device with a jib that can be supported at a predetermined angle with respect to the telescopic boom, the jib support device is configured to support the telescopic boom with respect to the telescopic boom end between the telescopic boom end and a position near the end of the jib. The base side connecting member, the hydraulic cylinder, and the distal side connecting member are connected in a straight line, and the base side connecting member is removable, and a flexible member is used for the base side connecting member portion, and the hydraulic cylinder can be moved to expand and contract. The present invention is characterized in that the length of the jib support device can be changed by adjusting the length of the jib support device.

(Function) The jib-equipped crane device of the present invention has a hydraulic cylinder installed in the longitudinally intermediate portion of the jib support device interposed between the telescopic boom tip and the jib so as to be able to extend and contract. Therefore, by extending and retracting the hydraulic cylinder from the ground, it is possible to change the length of the jib support device and change the tilt angle of the jib.

Furthermore, since the entire jib support device is provided at a position in front of the tip of the telescopic boom, the tilt angle of the jib does not change in conjunction with the telescopic boom's telescopic movement.

Furthermore, since the jib support device is constructed by connecting the proximal connecting member, the hydraulic cylinder, and the distal connecting member in a straight line, the sheave for rope hanging can be used as shown in the known example shown in FIG. No longer needed.

In addition, the base side connecting member of the jib support device is detachable from the tip of the telescopic boom, and since a flexible member such as a rope is used for the base side connection member, the jib support device During assembly/disassembly, with a relatively heavy hydraulic cylinder placed on the jib, the flexibility of the base connecting member allows the base end to be connected to the tip of the telescopic boom. . In addition, after assembling the entire jib support device,
The tilt angle of the jib can be adjusted by adjusting the hydraulic cylinder.

(Embodiment) A preferred embodiment of the present invention will be described with reference to Figs. 1 to 5. Figs. 1 to 3 show the first embodiment of the present invention, and Fig. 4 shows the same embodiment. Embodiment 2 FIG. 5 shows a crane device with a jib according to the third embodiment.

The jib-equipped crane device of the first embodiment shown in Figs. A telescopic boom 3, which is formed by sequentially connecting an end boom 31, an intermediate boom 32, and a tip boom 33 in a telescopic manner, is attached so that it can be raised and lowered freely, and a jib 4 is attached to the lower end of the tip 33a of the tip boom 33. It is pivotally attached so that it can be driven vertically within the locus plane and is detachable, and furthermore, a jib support device 5 is interposed between the upper end of the tip 33a of the tip boom 33 and the vicinity of the tip 4a of the jib 4. It is set up. In this embodiment, the telescoping boom 3 is of a three-stage telescoping type, and the base end boom 31 and intermediate boom 32 of this embodiment constitute the base-side boom within the scope of the utility model registration claim. There is.

In addition, in this embodiment, the jib 4 is of a lower holding type, and when performing crane work without using the jib, the jib 4 is removed from the tip 33a of the tip boom and the bottom surface of the base boom 31 is removed. It can be kept on the side. In other embodiments, the jib 4 may be of a horizontally-held type.

This jib 4 has a two-stage telescoping structure consisting of a base jib 4A and a tip jib 4B, and can be used by extending and contracting the tip jib 4B relative to the base jib 4A as needed. It's becoming like that.

At the top of the swivel base 2, there is an operation room 10 for operating the crane, a winch device 7 for operating a main hook (not shown) suspended from the tip 33a of the tip boom 33, and a winch device 7 for operating the tip of the jib 4 (tip side jib 4B).
A winch device 8 for operating an auxiliary hook 19 is provided, which is suspended from the tip of the auxiliary hook 19.

The jib support device 5 supports the tip portion 3 of the tip boom 33.
Two on the left and right are provided between the upper part of the jib 3a and the upper part near the tip of the jib 4 (the tip of the base jib 4A) 4a. This jib support device 5 has connecting pieces (a base side connecting piece 51b, a distal side connecting piece 51c) at both ends of a relatively short wire rope 51a (which constitutes a flexible member within the scope of the claimed utility model). A proximal connecting member 51 that is attached, a distal connecting member 52 that is a relatively long rod, and both connecting members 51,
52 and a hydraulic cylinder 6 interposed between them are connected in a straight line. That is, the distal coupling piece 51c of the proximal coupling member 51 and the end of the cylinder rod 62 of the hydraulic cylinder 6 are coupled by the coupling pin 55, and the end of the cylinder tube 61 of the hydraulic cylinder 6 and the proximal end of the distal coupling member 52 are connected. They are connected and integrated by a connecting pin 56. And each jib support device 5
connects the base side connection piece 51b of the base side connection member 51 to the upper end portion of the distal end portion 33a of the distal end boom 33 with the connection pin 5.
7, and the distal end of the other connecting member 52 is pivotally attached to the upper part of the proximal jib 4A near the distal end 4a of the jib 4 via a connecting pin 58.

It is preferable that the hydraulic cylinder 6 is installed at a position as close to the proximal end side as possible in the entire length of the jib support device 5. That is, the hydraulic cylinder 6 is relatively heavy, and the load moment during crane work is reduced by installing the hydraulic cylinder 6 closer to the proximal end than to the distal end of the jib support device 5. Note that the base side connecting member 51 includes a bendable wire rope 51a.
When the entire jib support device 5 is interposed between the tip 33a of the tip boom 33 and the tip 4a of the jib 4, the hydraulic cylinder 6 is extended appropriately in advance as shown in FIG. The base side connection piece 5 of the base side connection member 51 is placed on the top surface of the jib 4 in the state of
1b is connected and fixed to a predetermined position of the tip end portion 33a of the boom with a connecting pin 57, and then the hydraulic cylinder 6
The entire jib support device 5 may be tensioned as shown by the chain line 5' (FIG. 3).

The overall length of this jib support device 5 is determined so that the tilt angle θ (Fig. 1) of the jib 4 with respect to the telescopic boom 3 is approximately 0 to 5 degrees when the hydraulic cylinder 6 is contracted to the maximum. There is. Also, a hydraulic cylinder 6 used in the intermediate part of this jib support device 5
The telescopic stroke of the jib 4 is determined so that the tilt angle θ of the jib 4 with respect to the telescopic boom 3 can be bent to, for example, about 45° when the jib 4 is fully extended.

An oil supply hose 63 for supplying oil to the hydraulic cylinder 6 is guided to the swivel base 2 side via a swivel joint (rotary joint) 64. The hydraulic cylinder 6 can be expanded or retracted by operating a switching valve 65 from the operation chamber 10. The swivel joint 64 is attached to the side surface of the proximal boom 31 so that the oil supply hose 63 can freely follow when the telescopic boom 3 extends and contracts.

1 to 3, reference numeral 41 is a back-up stopper for preventing the jib 4 from rising excessively relative to the telescopic boom 3, 42 is a boom hoisting cylinder, and 68 is a pair of left and right jib support devices. This is a counterbalance valve for preventing self-propulsion of each hydraulic cylinder 6 when the hydraulic cylinder 6 of No. 5 is extended, and for preventing extension of the hydraulic cylinder 6 when the oil feed hose 63 is broken.

In the jib-equipped crane device of this first embodiment,
When performing crane work without using the jib 4, the jib 4 is held on the lower surface of the base end boom 31. In addition, at that time, the oil supply hose (the oil supply hose on the side beyond the swivel joint 64) is connected to the hose guide 69 provided on the side of the telescopic boom 3.
Remove 63a. Furthermore, when attaching the jib 4 to the boom tip 33a, the base end 4b of the jib 4 is pivoted to the boom tip 33a, and then the jib 4 is pivoted forward from the bottom surface of the boom 31 ( For example, by locking a load hook to the tip of the jib and operating a winch device), then, as shown in FIG. 3, the hydraulic cylinder 6 of the jib support device 5 is placed on the top surface of the jib 4. Extend the proximal connecting piece 51b of the proximal connecting member 51 by an appropriate length in advance, and connect the proximal boom tip 33a with the connecting pin 57.
After pivoting the hydraulic cylinder 6 to the operation chamber 10
Then, the jib support device 5 is tensed and the jib 4 is supported by a contraction operation. At this time, the oil supply hose 63a on the side beyond the swivel joint 64 is held by a hose guide 69 on the side of the telescopic boom 3. Further, the auxiliary hook 19 pulls out the wire rope 18 from the winch device 8 and guides it to the jib tip 4a as shown in FIG. When using this jib-equipped crane device, as shown in Fig. 2, the boom hoisting cylinder 42 is extended to raise the telescopic boom 3 to a predetermined angle, and the telescopic boom 3 is further extended as necessary. conduct.
In addition, the jib-equipped 4 is connected from the operation room 10 to the jib support device 5.
By appropriately expanding and contracting the hydraulic cylinder 6, the tilt angle can be changed steplessly, and the tilt angle of the jib 4 can be freely changed according to the situation at the work site. In FIG. 1, the switching valve 65 is a manual type, but in other embodiments, the switching valve is an electromagnetic type, and a so-called power supply system comprising this switching valve, a hydraulic pump, an electric motor, a power source, and a tank is used. The unit is disposed at the base end of the jib 4 or at the tip 33a of the tip boom 33, and the cord for controlling the electric motor and the switching valve is led to the operation room 10, and the electric motor and the switching valve are connected from the operation room 10. The control may be performed.

In the jib-equipped crane device of the second embodiment shown in FIG. 4, the pivot portion (connection pin 57 The lower end of a mast 70 having an appropriate height is fixedly attached to the pivot portion 57 using the pivot portion 57, and the proximal connecting piece 51b of the jib support device 5 is connected to the upper end of the mast 70. There is. In this case, the part including the mast 70 becomes the tip of the telescopic boom within the scope of the utility model registration claim. In this way, the jib 4 and the jib support device 5
This allows for a large angle between the crane and the crane, ensuring sufficient support for the load during crane work.

In the jib-equipped crane device of the third embodiment shown in FIG. By connecting the tip of the wire rope 17 let out from the winch device 7 for operating the main hook to 71a and winding and rewinding the winch device 7,
The inclination angle of the mast 71 is supported so that it can swing back and forth (within the plane of the boom lofting locus), and a jib support device 5 with a hydraulic cylinder 6 similar to that of the first embodiment is attached to the tip 71a of the mast 71. It is configured by connecting the base side connecting pieces 51b of the side connecting member 51. In the crane device with a jib according to the third embodiment, the inclination angle of the mast 71 can be changed by winding or rewinding the winch device 7, and thereby the tilt angle of the jib 4 can be changed. (for example, from the position shown by the solid line of the jib 4 to the position shown by the chain line 4'), and by expanding and contracting the hydraulic cylinder 6 of the jib support device 5, the tilt angle variation range of the jib 4 is further enlarged (for example, from the position shown by the chain line 4' of the jib 4). 4' position to the chain line 4'' position).In addition, in the jib-equipped crane device of this third embodiment, when the telescopic boom 3 is telescopically moved with the jib attached, Similarly, it is necessary to correct the tilt angle fluctuation of the jib 4 by winding or rewinding the winch device 7. By providing the jib-equipped crane device with a means for adjusting the tilt angle of the jib by the telescoping motion of the hydraulic cylinder 6 of the jib support device 5, the usable range (tilt angle variation range) of the jib 4 can be further expanded. In addition, in the jib-equipped crane device of the third embodiment, even when the jib 4 is tilted down to a substantially horizontal position as shown by the chain line 4'', the jib 4 is supported via the mast 71. This ensures sufficient support for the load during crane work.

(Effects of the invention) The jib-equipped crane device of the invention has the following effects.

(1) Since a hydraulic cylinder 6 is interposed in the longitudinally intermediate portion of the jib support device 5 for supporting the jib 4, the tilt angle of the jib 4 can be adjusted from the ground by extending and contracting the hydraulic cylinder 6. The jib tilt angle can be changed easily.

(2) Since the flexible member 51a is used as the base connecting member 51 of the jib support device 5, it is not necessary to place the relatively heavy hydraulic cylinder 6 on the jib 4 when assembling or removing the jib support device 5. Even when a heavy hydraulic cylinder 6 is used as the jib support device, the work of assembling and disassembling the jib support device 5 can be done easily and with light work.

(3) Base side connecting member 51 that constitutes the jib support device 5
Since the hydraulic cylinder 6 and the front connecting member 52 are connected in a straight line, even if the tilt angle of the jib is changed by extending and contracting the hydraulic cylinder, for example, as shown in FIG. Like the known jib-equipped crane device shown in FIG. 1, a sheave for wrapping a rope is not required as a jib support device, and the overall structure of the jib support device 5 can be simplified.

[Brief explanation of drawings]

FIG. 1 is a side view of the jib-equipped crane device according to the first embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the jib-equipped crane device of FIG. 1, and FIG. 3 is the jib-equipped crane device of FIG. 1. 4 is a partial side view of a crane device with a jib according to a second embodiment of the present invention, and FIG. 5 is a side view of a crane device with a jib according to a third embodiment of the present invention. , FIG. 6 is a side view of a conventional crane device with a jib, and FIG. 7 is a partial side view of another conventional crane device with a jib. 2...Swivel base (base), 3...Telescopic boom, 4
...Jib, 5...Jib support device, 6...Hydraulic cylinder, 10...Operation room, 31, 32...Base side boom, 33...Tip boom, 33a...Telescopic boom tip, 51... Base side connecting member, 51a... flexible member (rope), 52... distal side connecting member.

Claims (1)

[Scope of utility model registration request] A tip end portion 33 of a telescopic boom 3 that is attached to the base 2 so as to be able to rise and fall freely, and a tip boom 33 is telescopically connected to the base side booms 31 and 32.
A jib 4 is pivotally attached to the telescopic boom 3 in such a manner that it can pivot vertically within the up-and-down trajectory plane of the telescopic boom 3 and can be attached and detached, and a jib support is provided between the telescopic boom tip 33a and the jib 4. The jib-equipped crane device is capable of supporting the jib 4 at a predetermined angle with respect to the telescopic boom 3 by interposing a device 5, and the jib support device 5 is configured to support the jib 4 at a predetermined angle with respect to the telescopic boom 3. A base side connecting member 51 and a hydraulic cylinder 6 are connected to a position near the tip of the jib 4 and are detachably attached to the telescopic boom tip 33a.
and the tip side connecting member 52 are configured to be continuous in a straight line, and furthermore, a flexible member 51a is used in the base side connecting member 51 portion, and the hydraulic cylinder 6 is made to extend and contract, thereby supporting the jib support device. A crane device with a jib, characterized in that the length of the jib can be changed.