JP2640260B2 - Jib mounting device at the end of the telescopic boom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a device for mounting a jib at the end of a telescopic boom of a mobile crane truck such as a truck crane which can be raised and lowered.

[Conventional technology]

Conventionally, in such a crane truck, in order to enable quick installation of the crane, as disclosed in Japanese Patent Application Laid-Open No. 54-72839, the jib is mounted on a connecting frame that can be raised at the end of a telescopic boom. An invention is known in which one base end is removably pivoted by a vertical axis at a horizontal position of the telescopic boom so that the jib when not in use is horizontally held and stored in a base boom cylinder of the telescopic boom. .

[Problems to be solved by the invention]

However, this configuration has the advantage that the jib can be attached to and detached from the tip of the telescopic boom relatively quickly, but since the jib when not in use is hung beside the base of the telescopic boom, it can be used when constructing a high-rise steel structure. For a jib that loads and unloads heavy loads between the ground and a remarkably high place as described above, the lifting capacity during loading and unloading work by the telescopic boom that houses the jib is greatly reduced due to the increase in the weight of the jib. I do. In order to avoid this, a connecting frame with a jib must be detachably attached to the end of the telescopic boom.However, the ground height of the telescopic boom tip that has contracted cannot be reduced too much. When attaching and detaching the heavy connection frame with a jib, the main connection portions of the two interfere with each other, and the work of matching the pin holes connecting the main connection portions and the work of safely and easily separating the hand connection portion are performed. Difficult to install or remove the jib quickly.

The present invention addresses this problem and aims to safely and easily connect and disconnect the main connecting portion. A second object of the invention is to use, without using other cranes,
An object of the present invention is to enable attachment and detachment of a connecting frame with a jib to and from a telescopic boom by itself.

[Means for solving the problem]

According to the present invention, both ends of the connection frame are detachably connected to the distal end of the telescopic boom that can be lifted freely by upper and lower main connecting portions, and the base ends of the jib and its raising cylinder are connected to the upper and lower sides of the connection frame, respectively. In a crane truck configured so that an included angle between a jib and a connecting frame can be made acute, an upper end portion of a first arm planted on a connecting frame at a tip of a telescopic boom and a second arm attached to a tip top of the telescopic boom. A detachable sub-connector is provided between the arm and the tip of the arm so that one of the two arms sandwiches the other left and right and connects the connecting frame so as to rotate within the elevating surface of the telescopic boom. When the jib tip is supported on the ground, etc.,
Although the connecting pin of the main connecting portion can be inserted and removed, in the cargo handling operation state by the jib, the first and second arms are elastically moved due to a suspended load acting on the connecting frame or a weight of the jib. The bending stiffness of the first and second arms is set such that the load is flexed and transmitted to the distal end of the telescopic boom via the upper and lower main connecting portions.

A pair of second arms are provided at the top of the end of the telescopic boom so as to sandwich the pulley device for loading and unloading work at the end of the telescopic boom, and first arms are detachably connected to the respective arms on both sides of the top of the connection frame. It is good to set up.

When it is desired to attach and detach the connecting frame with a jib to the tip of the telescopic boom by itself, the tip of the second arm attached to the top of the tip of the telescopic boom is projected beyond the tip of the telescopic boom, and the telescopic boom is positioned substantially horizontally. A rotary roller device for supporting the jib tip movably in its longitudinal direction is provided between the tip of the jib that has fallen down and the ground, and the jib tip is supported by the rotary roller device. An engaging means of a hanging cable is provided at the top of the connecting frame, which is capable of suspending the connecting frame in which the main and sub connecting portions are disconnected from the end of the telescopic boom so that both side walls thereof are substantially vertical. The pulley that the rope goes through,
Attached on the end of the telescopic boom so that the sub-connection between the first and second arms could be detached or matched by the slack and pulling of the suspension cable, and the sub-connection could be connected by pulling the suspension cable. A stopper portion that sometimes comes into contact is provided between the first and second arms.

[Action]

The present invention has the above-described structure, and in the case of performing a cargo handling operation by using a jib, the load applied to the jib by the elastic bending of one or both of the first and second arms supporting the sub-connection portion. Is transmitted from the connecting frame to the telescopic boom mainly via the upper and lower main connecting portions.

In the case of the invention in which the connecting frame with the jib is attached to the end of the telescopic boom at a substantially horizontal position using another crane, the jib is so arranged as to prevent interference between the main connecting portion on the connecting frame side and the main connecting portion on the telescopic boom side. The connecting frame with a jib with a smaller included angle between the connecting arm and the jib is lifted substantially horizontally by a hoisting cable of another crane, and the upper end of the first arm and the tip of the second boom on the telescopic boom side are fitted to each other. After connecting the sub-connection part, the jib tip is suspended with the sub-connection part as a fulcrum until the tip of the jib is substantially supported by the ground or the carrier of the jib carrier, and then the jib elevating cylinder is controlled to control the sub-connection part. When the connecting frame is rotated toward the telescopic boom with the fulcrum as a fulcrum, the weight of the jib or the like acting on the sub-connecting portion is small, and the first and second arms do not bend. The pin holes of the parts match. Therefore, the main connecting portion can be easily connected by the pin.

When removing the connecting frame with a jib from the end of the telescopic boom at a substantially horizontal position, control the jib elevating cylinder to support the jib end on the ground, pull out the connecting pins of the upper and lower main connecting parts, and then The jib is lifted by the hoisting rope of the crane with the auxiliary connection part as a fulcrum as described above to separate the main connection part, and then the jib elevating cylinder is controlled so that the included angle between the jib and the connection frame is minimized After that, the connection of the sub-connection portion is released, and the connection frame with the jib is suspended by the crane.

Also, in the case of the invention in which the connecting frame with the jib is attached to the tip of the telescopic boom in a substantially horizontal position by itself, the jib having the smallest included angle with the connecting frame is positioned in a vertical plane including the substantially telescopic boom axis. The jib tip is placed on the ground or a carrier of a jib carrier so that the tip of the jib is supported by the rotating roller device, and a hanging cable engaged with the top of the connection frame is pulled over a pulley on the tip of the telescopic boom, If this is towed by a winding drum or other towing device mounted on a crane truck, the tip of the jib rolls and moves on the ground or the like, and the upper end of the first arm and the tip of the second arm fit together. The sub-connecting portion is connected so as to be connectable by contact of the stopper between the two arms, so that the sub-connecting portion is connected there, and the connecting frame is turned to the telescopic boom side by the jib elevating cylinder using this as a fulcrum. Moving the main connecting part with the pin It is the same.

The load acting on the first and second arms when the connection frame rotates is approximately half the weight of the jib-connected connection frame.
1, The second arm hardly bends, and there is no possibility that the connection of the main connecting portion is hindered. Also, the height fluctuation between the tip of the telescopic boom and the ground or the carrier of the jib carrier is absorbed by the fluctuation of the inclination of the connecting frame with jib.

When removing the connecting frame with the jib from the telescopic boom at a substantially horizontal position, the jib is lowered so that the tip end of the jib is supported on the ground or the like via the rotating roller device, and the connecting pin of the main connecting portion is removed. Then, if the jib raising cylinder is controlled to minimize the included angle between the jib and the connection frame, the jib whose tip is rolled and supported on the ground or the like via the rotating roller device,
The connection frame rotates toward the jib with the sub-connection portion as a fulcrum, and the main connection portion is separated. Therefore, the connection of the sub-connection portion is released while the load on the sub-connection portion is reduced by making the suspension cable of the connection frame slightly tow,
The hanging cable is gradually relaxed to suspend the jib-connected frame on the ground or the like.

By providing a pair of left and right sub-connectors for releasably connecting the first arm on the connection frame side and the second arm on the distal end of the telescopic boom, the center of rotation of the jib-connected connection frame is maintained by the sub-connection portions. It is clear that the accuracy is improved, and therefore the pin hole matching accuracy of the main connecting portion is improved, so that the connecting pin can be easily inserted and removed.

〔Example〕

FIG. 9 shows an example of a crane truck to which the present invention is applied, in which five boom cylinders 20, 21, 22, 23, 24 which expand and contract by a hydraulic mechanism.
Base boom cylinder of telescopic telescopic boom 1
20 is pivotally supported 28 by a derrick cylinder 27 on a revolving base 26 that is rotatably mounted at the rear of the body of a car 25, and at least a car body before and after a turntable 29 of the revolving base has Outriggers 30 and 31 on both sides are attached to enable horizontal support of the vehicle body. When the connecting frame 2 with the jib is attached to the telescopic boom, a means for turning the rotary motor of the rotary table 26 into a free rotation state is provided, and when the first and second arms 7 and 8 are fitted to each other, the telescopic boom is used. Preferably, the swivel 26 can be turned so that the axes of the 1 and the jib 5 are in the same vertical plane. Reference numerals 18 and 19 denote a group of upper and lower pulleys for loading and unloading, which are mounted inside the distal end of the distal end boom cylinder 24.

FIG. 1 to FIG. 6 show an embodiment of the present invention,
Is a rectangular frame on the front side, and both side walls are end boom cylinders respectively.
Rigid main connecting portions 3 and 4 are provided substantially opposite to both side walls of the distal end portion of the 24, and connected to upper and lower sides of the opposing side walls by detachable horizontal pins. The pin holes of the upper and lower main connecting portions are formed by actual matching in a state where the sub connecting portions 9 are connected. At the upper front end of the connecting frame 2, three jib cylinders 3
Base end jib cylinder 3 of telescopic jib 5 consisting of 2,33,34
2 is pivotally pivoted 35 within the elevating surface of the telescopic boom 1, and the base jib cylinder 32 is moved by a jib elevating cylinder 6 connected between the jib cylinder 32 and the lower front end of the connecting frame 2. It is rotatable between a position shown by the solid line in FIG. 2 where the included angle between the frame and the connecting frame is minimum and a position shown by the chain line in FIG. 1 where the included angle is substantially a right angle. The telescopic jib 5 has a built-in hydraulic cylinder 36
(See FIG. 6).
A plurality of cargo handling pulleys 37 and 38 are respectively provided above and below the tip of the vehicle.

At the top of the tip of the tip boom cylinder 24, a pulley device (18, 19)
, A pair of left and right second arms 8 is pivoted 39. Each second arm 8 is formed of two triangular shapes having an interval into which an upper end portion of the first arm 7 described later is fitted, and a pair of left and right second arms 8, 8 is connected to a connecting pipe 40 (see FIG. 5). And is stored rigidly when not in use as shown by the chain line (a) in FIG. The first arms 7 respectively corresponding to the pair of left and right second arms are formed by forming the upper end of a tubular body implanted on the connection frame 2 into a fork portion 14 having high rigidity, and the sub-connection portion 94 A horizontal shaft 41 attached to the distal end of the second arm 8 is fitted to the fork portion 14 until it comes into contact with the base stopper portion 14a, and a pin 42 contacting the shaft 41 is inserted into and removed from the open end of the fork. I have to. Reference numeral 44 denotes a projection provided on the top of the distal end of the boom cylinder 24 so as to measure the left and right positions of the second arm 8.

As shown in FIG. 4, one end of the lifting mechanism of the connecting frame 2 with a jib is detachably fastened 43 inside the second arm 8 on the right side, and is rotatably mounted on a shaft 41 at the tip of the second arm. Mounted pulley
The suspension cable 11 passing through 12 is sequentially extended over a pair of left and right pulleys 45, 45 mounted on the connecting frame 2 and a pulley 12 rotatably mounted on the shaft 41 at the tip of the second arm on the left side. The other end of the suspension cable 11 can be pulled and relaxed by a bobbin and other suspension cable traction devices mounted on the swivel 26. The pair of left and right pulleys 45 on the connecting frame side are respectively pivoted on the first arm 7 and the bracket 46.
Since it is rotatably supported by a pulley support plate 48 rotatably supported by 47, a connecting frame with a jib supported on the ground G as shown by a solid line in FIG. ) To the state shown by the dashed line (C), or conversely, to the inclination change of the connecting frame when hanging.

Accordingly, the pulley 12 and the pulley 45 during the lifting of the jib-coupled frame whose jib tip is supported by the rotating roller device 10 described below.
Is always maintained substantially vertically, and the connecting frame with the jib is lifted equally to the left and right. As shown in FIG. 2C, the fork base end stopper portion 14a of the first arm 7 of the connection frame with the jib lifted as shown in FIG. 2C contacts the shaft 41 on the second arm side, and the sub-connection portion 9 is connected by the pin 42. When this is done, the jib raising cylinder 6 is extended to rotate the connecting frame 2 toward the telescopic boom with the sub-connecting portion 9 as a fulcrum. 4 may be adapted to allow the connecting pin to be inserted and removed. Stopper means, such as a stop bolt 49 (FIG. 1), with which the connecting frame 2 abuts when the main connecting portions match, can be adjustably mounted near the upper main connecting portion 3 on both ends of the telescopic boom.

As shown in FIGS. 2 and 6, the rotating roller device 10 has an inverted U-shaped support portion 50 surrounding both side surfaces and a top surface of the base end jib cylinder 32, and upper end portions at the lower end on the jib tip side. Attached to each 51
Mounting portion 53 of the axle 52, an axle mounting portion 55 having upper ends both pivotally connected 54 to the lower end on the jib base end side of the support frame portion 50, and the axle mounting portion 55 and the axle 52 can be separated freely. A pair of left and right rotating rollers (wheels) 15 are rotatably mounted on the axle 52 of the support frame 16 including the connecting portion 56 to be connected, and the distal end portion of the base jib cylinder 32 is loosely inserted into the support frame 16. The base end of the jib cylinder is pivoted on the top of a support frame 16 by a shaft 17 mounted at the center of the top of the cylinder in parallel with the jib axis. Separating 56, rotating roller
The portions 53 and 55 are folded and secured so that the pivot 15 moves to the position shown by the chain line in FIG. 2, so that the rotating roller device does not hinder the cargo handling operation.

Although the embodiment has been described above, in the case where the pulley device (18, 19) for cargo handling work is completely stored in the distal end portion of the distal end boom cylinder 24, as shown in FIG. 7 and FIG. The tip is detachably connected 58 to the center of the top of the connecting frame 2 so that the pulley 60 via the hanging cable 57 can be attached to the tip of an arm 59 attached to the center of the top of the tip of the tip boom cylinder 24. If the top of the connecting frame with a jib is hung by the hanging cable 57 so that both side walls thereof are substantially vertical, the rotating roller device 10 can be
A rotating roller (wheel) having a diameter larger than that of the pulley can be attached to both ends of the support shaft of the lower pulling work pulley 38 at the end of the jib.

This is because the connecting axis of the sub-connecting portion between the connecting frame side and the tip boom cylinder side exactly matches by the abutment engagement of the stopper portion. It is okay if the side sub-connection axis is slightly inclined,
This is because the unevenness and inclination of the ground for wheel running can be corrected to some extent by laying timber as appropriate. Obviously, the rotating roller device can also be mounted on the jib carrier.

7 and 8 are welded to the distal end of the second arm 8 so as to sandwich the annular portion 61 welded to the upper end of the first arm 7 on the connection frame 2 sideways. A concentric arc-shaped stopper portion 62a is provided between the annular portions 62, and when the annular portion 61 on the first arm abuts and engages with the stopper portion, the two annular portions 61, 62 are inserted and removed. The connection is made by a free pin 63.

It is not a necessary condition of the present invention to implant a pair of left and right first arms 7 on the connecting frame, but the pair of left and right second arms 8 attached to the distal end side of the telescopic boom is implanted on the connecting frame. The distal end of one first arm may be sandwiched between left and right.

Although not shown, on both sides of the distal end of the base boom cylinder 20, winders of hydraulic hoses for supplying and discharging hydraulic pressure to the jib elevating cylinder 6 and the hydraulic cylinder 36 for extending and retracting the jib are attached, respectively. It is a matter of course that the pipe joints can be connected or separated when the connecting frame with the jib is attached to or detached from the end of the telescopic boom, for example, by providing a detachable pipe joint at the portion.

〔The invention's effect〕

 According to the present invention, the following effects can be obtained.

(1) When attaching and detaching the connecting frame with jib to the tip of the telescopic boom, reduce the included angle between the jib and the connecting frame.
The main connecting portion is connected so as to prevent interference between the main connecting portions, and then the main connecting portion is configured to be fitted to or detached from the connecting pin so that the connecting pin can be inserted or removed from the auxiliary connecting portion as a fulcrum. The connecting frame with jib can be quickly and easily attached and detached, and after connecting the upper and lower main connecting parts, the first and second arms supporting the sub-connecting part during the cargo handling work by the jib are elastic. Therefore, there is no possibility that both arms are damaged or permanently deformed.

(2) A pair of left and right second arms is attached to the top of the end of the telescopic boom so as to sandwich the pulley for cargo handling, and the first arms connected to the respective second arms in a detachable manner are planted on the connection frame side. If provided, the pin hole matching accuracy of the main connecting portion with the sub-connecting portion as a fulcrum is improved, and the connecting pin can be easily inserted and removed.

(3) A suspension that allows the second arm to protrude beyond the distal end of the telescopic boom, and that allows a jib-connected frame that has a jib distal end supported by a rotating roller device to be lifted such that both side walls are substantially vertical. If a pulley via a cable is mounted on the distal end of the telescopic boom so as to be able to mate or disengage with the sub-connecting portion and a stop means is provided for engaging when the sub-connecting portion is mated, the pulling line towing mounted on the crane truck can be provided. Using the device, the connecting frame with jib can be attached to and detached from the end of the telescopic boom by itself.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is a side view showing a method of attaching a connecting frame with a jib to the distal end of a telescopic boom, FIG. 3 is a sectional view taken along line AA of FIG. The figure is BB in FIG.
FIG. 5 is a plan view of a main part of FIG. 1, FIG. 6 is a cross-sectional view taken along the line CC of FIG. 1, and FIG. 7 is a cross-sectional view corresponding to FIG. FIG. 8 is a sectional view taken along the line EE of FIG. 7, and FIG. 9 is a side view of the crane truck. 1 ... telescopic boom, 2 ... connecting frame, 3, 4 ... main connecting part,
5 ... jib, 6 ... jib raising cylinder, 7 ... first arm, 8 ... second arm, 9 ... sub-connection part, 10 ... rotating roller device, 11, 57 ... hanging cable, 12, 60 ... pulley, 14a, 62a ...
... Stopper part, 15 ... Rotating roller, 16 ... Support frame, 17 ...
... shaft, (18, 19) ... pulley device for cargo handling work.

Claims (3)

(57) [Claims] 1. A jib (5) and a cylinder for raising and lowering the jib (5) by connecting the both ends of a connecting frame (2) to the tip of a telescopic boom (1) that can be lifted freely by upper and lower main connecting portions (3, 4). (6), the base end of which is connected to the upper and lower sides of the connecting frame, respectively, so that the included angle between the jib and the connecting frame can be made acute. One of the two arms is connected between the upper end of the implanted first arm (7) and the tip of the second frame (8) attached to the top of the tip of the telescopic boom while holding the other left and right. Separable sub-connector (9) for connecting the frame so as to rotate within the elevating surface of the telescopic boom
In the state where the leading end of the empty jib is supported on the ground or the like, the connecting pin of the main connecting portion can be inserted and removed, but in the state of the jib's cargo handling operation, it acts on the connecting frame. The first and second due to the suspended load and the weight of the jib
Arm so that the suspended load or the like is transmitted to the distal end of the telescopic boom via the upper and lower main connecting portions.
1. A jib mounting device at the end of a telescopic boom, wherein the bending rigidity of the second arm is set. 2. A pair of left and right second arms (8) are attached to the top of the end of the telescopic boom so as to sandwich the pulley device (18, 19) for cargo handling work attached to the end of the telescopic boom. 2. The jib mounting apparatus according to claim 1, wherein first arms (7) detachably connected to the respective second arms via the respective joints are planted on both sides of the top of the connection frame (2). 3. A jib that projects the tip of the second arm (8) attached to the top of the tip of the telescopic boom ahead of the tip of the telescopic boom, and falls down on the telescopic boom (1) in a substantially horizontal position. 5) a rotary roller device for supporting the tip of the jib movably in the longitudinal direction between the tip of (5) and the ground, and the telescopic boom in a state where the tip of the jib is supported by the rotary roller device. Main / sub connection to tip (3,4,9)
The engagement means of the hanging cable (11,57) which can be hung so that both side walls are substantially vertical is provided at the top of the connecting frame, and the hanging cable passes through. Pulley (12,60)
Attach on the tip of the telescopic boom (1) so that the sub-connecting part (9) between the first and second arms (7, 8) is detached or matched by the relaxation and towing of the suspension cable, and the suspension cable is towed. The stopper portion (14) that comes into contact when the sub-connecting portion
3. The jib mounting apparatus according to claim 1, wherein a, 62a) is provided between the first and second arms.