JPH0412995A - Base supporting device of jib boom in mobile crane - Google Patents

Abstract

PURPOSE:To reduce the min. turning space by reducing the distance from the turning center in the change of the traveling direction to the max. separation point by bending a base whose top part one side is installed at the basic edge of a jib boom to the side part of the jib boom. CONSTITUTION:After the basic part jib boom 6A of a jib boom 6 is accommodated on the side part of the basic part boom 1A of an extension boom 1, a base 7 which is installed in turnable manner on the basic part jib boom 6A by an installation pin 8 and an extension cylinder 10 which is connected at the center lower side of the basic part jib boom 6A by installation pins 8B and 8C are contracted to a contraction position 10C, and the base 7 is turned in the counterclockwise direction around the installation pin 8, and bent to the alternate long and short dash line position 7C on the side part of the basic part jib boom 6A, and the edge part outside of the base 7 is shifted upwardly from the edge part of the basic part jib boom 6A. Accordingly, the distance from the turning center in the change of the traveling direction of a mobile crane C to the max. separation point can be reduced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a base support device for a jib boom in a self-propelled crane, and in particular, to a base support device for a jib boom in a self-propelled crane. A jib boom is removably attached to the boom head via a base having a top portion on one side rotatably pinned to the base end of the jib boom, and
The present invention relates to a base support device for a jib boom in a self-propelled crane, which allows the jib boom to be stored in a storage position on the side of the base boom of a telescoping boom.

(Prior Art) One example of a conventional jib boom base support device for a self-propelled crane is disclosed in Japanese Patent Application Laid-open No. 119693/1983.

In this device, a mounting frame at the base of the jib boom is rotatably attached to the boom head of a telescoping boom, which is movable on the revolving frame of a self-propelled crane. This jib boom, together with the mounting frame pinned to the boom head, is stored in a storage position on the boom side of the base of the telescoping boom, and from this storage position, the jib boom on the boom head is The jib boom is extended to a cargo handling operation position, and the extension angle of the jib boom relative to the mounting frame is adjusted by the telescoping cylinder, and a winch device is also used to perform various cargo handling operations using the telescoping boom and the jib boom. .

Another conventional example of a jib boom base (mounting frame) support device for a self-propelled crane is as follows.

For example, there is a method described in JP-A-63-27396.

This device attaches one side of the mounting frame of the jib boom to one side of the boom head of a hoistable telescoping boom of a self-propelled crane via a rotation coupling device, and connects the other side of the mounting frame to the boom head of a self-propelled crane. The jib boom is removably attached to the other side of the head, and the base of the jib boom is pivoted to the axis in the width direction on the mounting frame, and the end of the jib boom and the jib boom mounting frame are connected by a telescopic cylinder. By doing this, the jib boom is stored in the retracted position on the side of the telescopic boom, or the jib boom stored in the retracted position is extended to the extended position on the boom head, and the jib boom in the extended state is moved to the retractable cylinder. It is used for various cargo handling operations using a telescopic boom and a jib boom by raising and lowering the crane and using a winch device in combination.

(Problems to be Solved by the Invention) However, in the jib boom base support device for a self-propelled crane described in JP-A-55-119693, the jib boom attached to the boom head of the telescopic boom is The extension angle can be adjusted by expanding and contracting the telescopic cylinder installed between the bottom surface of the jib boom and its base, in conjunction with the extension and contraction of the telescopic boom and/or the adjustment of the luffing angle, and various cargo handling operations can be performed by using a winch device in combination. When the jib boom is stored on the side of the base boom of the telescopic boom, the leg end of the jib boom base protrudes laterally from the side of the boom head. When turning a self-propelled crane, the base leg end of the jib boom that extends to the side of the boom head
This becomes the maximum separation point from the turning center when the traveling direction of the self-propelled crane is changed, and the minimum turning radius at this maximum separation point increases by a corresponding amount, which in turn reduces the turning performance of the self-propelled crane. there were.

Furthermore, in the base support device for a jib boom in a self-propelled crane described in the above-mentioned Japanese Patent Application Laid-open No. 63-27396, a rotary connection device is connected to one side of the boom head of a telescopic boom that can be raised and lowered. After locking the other side of the mounting frame of the jib boom that is rotatably attached to the boom head with a locking device and extending the jib boom over the boom head,
In addition to raising and lowering the jib boom using a telescopic cylinder and performing various cargo handling operations using the jib boom in conjunction with a winch device, the other side of the boom head and the jib boom base are released from the locking device, and the jib boom is moved to the same position as the boom head. Although the jib boom can be rotated around the side rotation coupling device and stored on the side of the base boom of the hoisting boom, in this case, when the jib boom is stored on the side of the base boom, , the legs of the mounting frame at the bottom of the jib boom are positioned and protrude to the side of the boom head of the telescoping boom), and both of them are attached to the body frame of the self-propelled crane (the reference numeral ``in Figure 1'' indicating an embodiment of the present invention). K)), the lateral width (in the direction of the vehicle of the self-propelled crane) of this protrusion increases, and the turning space of the self-propelled crane is increased compared to the embodiment of the present invention. The turning locus circle r2 at the outer edge of the hole 7F of the mounting pin in Fig. 1, which is shown in Fig. 1, is considerably larger than the turning locus circle r1 of the boom head ID shown in the same figure, and the turning trajectory when the self-propelled crane changes the running direction. There was a problem in that the degree of freedom in the design of self-propelled cranes, which are subject to restrictions on vehicle interior, vehicle length, and vehicle height based on the Road Traffic Act, was reduced.

The present invention has been made by focusing on such problems in the conventional example.One side of the top of the base is rotatably attached to one side of the base of the jib boom, and the other side of the top of the base and the top of the base are rotatably attached to one side of the base of the jib boom. Both ends of a telescoping cylinder are attached to the center part of the jib boom, and one side of the boom head of the telescoping boom is attached to one side of the boom head of the telescoping boom, in which one side of the base end of the base is provided so as to be movable up and down on the revolving frame of the self-propelled crane. The jib boom is mounted rotatably and removably by a mounting pin parallel to the side surface of the base, and the other side of the base end of the base is removably attached to the other side of the boom head. When the jib boom is stored in the base, the base whose top portion is pinned to the base end of the jib boom is bent to the side, and the end of the base is moved from the end of the base boom to the center thereof. As a result, the distance from the turning center to the maximum separation point when changing the traveling direction of the self-propelled crane is shortened, the minimum turning space of the self-propelled crane is reduced accordingly, and the self-propelled crane has excellent turning performance. The present invention aims to provide a base support device for a jib boom in a type crane.

(Means for Solving the Problems) In order to solve the problems of the conventional example as described above, the present invention is such that one side of the top of the base is rotatably attached to one side of the base of the jib boom, and the base A boom head of a telescoping boom, in which both ends of a telescoping cylinder are attached to the other side of the top of the jib boom and to the center of the jib boom, and one side of the base end of the base is provided so that it can be raised and lowered by a revolving frame of a self-propelled crane. The boom head is rotatably and detachably attached to the side by a mounting pin parallel to the side surface of the boom head, and the other side of the base end of the base is detachably attached to the other side of the boom head. .

(Function) Since the present invention has the above-described configuration, it is possible to switch the jib boom between the retracted position on the base boom side of the telescopic boom and the extended position on the boom head of the telescopic boom, and also When the jib boom is extended above the boom head, various cargo handling operations can be performed in the same way as conventional self-propelled cranes by collaborating with the telescoping boom, jib boom, and winch devices attached to these booms. is stored in the side of the base boom, and by bending the base with one side of the top attached to the base end of the jib boom toward the side of the jib boom, the inside of the vehicle near the boom head of the telescopic boom can be The width of the direction, and therefore the distance from the turning center to the farthest point when changing the running direction of the self-propelled crane, is reduced to near the end of the boom head, and the minimum turning space of the white crane is reduced accordingly. Reduce the amount.

(Example) Hereinafter, an example of a base support device for a jib boom in a self-propelled crane according to the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory plan view of an embodiment of the jib boom base support device for a self-propelled crane according to the present invention, with the jib boom stored in the base boom side of the telescopic boom. The jib boom is stored in the base boom side of the telescopic boom. The maximum separation point from the turning center of the self-propelled crane (its approximate turning center is indicated by a dashed line) when changing the running direction of the self-propelled crane is the locus circle drawn around the turning center (the minimum turning space of the self-propelled crane). (plan view) is shown at the same time. Figure 2 is an explanatory side view of the
FIG. 3 is a side explanatory view of the main parts in a state where the jib boom is extended, and FIGS. 4 and 5 are longitudinal cross-sectional views taken along lines IV-IV and -■ in FIG. 2.

In FIGS. 1 to 5, reference numeral 1 denotes a telescoping boom, and the base of the telescoping boom l is pivoted to a revolving frame KK on the body frame of a self-propelled crane C so as to be able to rise and fall.

IA, IB, and IC are the base boom, middle boom, and top boom of telescopic boom 1, ID is the boom head at the top of the top boom IC, 2 is the spindle on the boom head ID, and 2B is provided on both sides of the spindle 2. Hole 2C is the main sheave on spindle 2,
2D is the auxiliary sheave installed around the boom head ID, 3
．． 4 is a bracket provided on the side of the base boom IA, 6 is a jib boom, 6A is a base jib boom of the jib boom 6, 6
B is a top jib boom extendably provided inside the base jib boom 6A, 7 is a base pinned to the base end of the base jib boom 6A, and the base 7 is at the top of one side (the right side in Fig. 1).
is rotatably attached to one side of the lower part of the base jib boom 6A (the upper left end portion in FIG. 2) by a mounting pin 8 extending vertically to the plane of the paper in FIG.

9 is a jib holding bracket provided at the center side of the base jib boom 6A; 9a is a pin on the bracket 9;
is loosely inserted into a hole 3a provided in the bracket 3.

10 is a telescopic cylinder, and the cylinder head (left end in FIG. 2) of this telescopic cylinder 10 is connected to the other side of the top of the base 7 (
The end of the cylinder rod (the right end in FIG. 2) is attached to the lower central part (second
(Figure).

11 is a guide rail projecting laterally from the bracket 4; 12 is a fixture provided on the top side of the base jib boom 6A; 12a is a shoe provided at the bottom of the fixture 12; It is placed slidably.

rl is the end of the boom head ID of the telescopic boom 1 (in the first case, the lower left end ) is a locus circle of radius R1 drawn around its turning center 0, and r2 is the end (first The left end of the figure) is a locus circle of radius R2 drawn around the turning center O, and r3 is the side of the boom head ID (
In the state where it is laid down (lower side in Fig. 1). Its end (lower left end in Fig. 1) is a locus circle of radius R3 drawn around its turning center ○, and r4 is the jib boom 6A when the telescopic boom 1 is stored in the jib boom 6A on the side of the base boom IA. When the lower base 7 is rotated counterclockwise around the mounting pin 8 by contracting the telescoping cylinder 10 (the base 7 is chained at one point in Fig. 1), its outer end (the third 1) is a locus circle of radius R4 drawn around the turning center O.

(Operation of the embodiment) The telescopic boom 1 whose base is pivoted to the swing frame KK on the vehicle body frame is laid down, and the support shaft 2 of the boom head ID is lowered.
To install from the end hole 2B, pull out the pin from hole 7F, turn the jib boom 6 counterclockwise (Fig. 1) around the mounting pin 7E, and use the expansion and contraction of the telescopic boom 1 to attach it to the side of the base boom IA. Then, engage the pin 9a of the fixture 9 provided on the side of the base jib-muro A with the hole 3a of the bracket 3 on the side of the base boom AIA, while moving the bracket 4 on the side of the base boom IA to the side. Place and support the shoe 12a at the bottom of the fixture 12 on the side of the base jib boom 6A on the protruding guide rail 11, then remove the mounting pin 7E and connect the end of the base 7 and the hole at the end of the support shaft 2. disengage.

Furthermore, the shoe 1 is attached to the guide rail 11 on the bracket 4.
2a, place the base jib boom 6A via the fixture 12,
Further rotate the base boom 1 to the side, and then turn the jib boom 6
is stored and fixed to the side of the base boom IA of the telescopic boom 1. Thereafter, this self-propelled crane C is moved to the destination and stably supported on the ground by an outrigger device (9) not shown. After that, the swing frame KK is rotated, the telescopic boom 1 is raised and/or extended, and the jib boom 6 is rotated. The jib boom of a conventional self-propelled crane of the same type is capable of performing various cargo handling operations by attaching to the boom head ID, extending and/or undulating it, and winding and unwinding the wire rope using a winch device (not shown). It has almost the same effect as the base support device.

However, in this embodiment, the base boom I of the telescopic boom 1
After storing the base jib boom 6A of the jib boom 6 on the A side in approximately the same manner as a conventional self-propelled crane of the same type, store the base jib boom 6A on one end side (upper left end in Fig. 2) and on the top side. (the upper right end in the figure) is attached to the other side of the top of the base 7 which is rotatably attached by the mounting pin 8 (the lower right side in Figure 2), and the lower center side of the base jib boom 6A (Figure 2). By contracting the telescopic cylinder 10, which connects the cylinder head and the end of the cylinder rod with the mounting pins 8B and 8C, to the contracted position 10C in FIG. 2, the base 7 can be moved from the solid line position in the figure. The base jib boom 6 is rotated counterclockwise (Fig. 2) around the mounting pin 8.
The outer end of the base 7 (the lower left end pin hole 7F portion in FIG. 1) is bent from the end of the base jib boom 6A to the upper side (1.2 (right side in the figure).

As a result, when changing the traveling direction of this self-propelled crane C, the distance from the turning center ○ to the maximum separation point,
Therefore, the radius R of the minimum turning space of the self-propelled crane C is the outer side of the end (mounted is the radius R4 of the minimum trajectory circle r4 when the base 7 is at this dashed-dotted line position if, 7C, compared to the radius R2 of the minimum trajectory circle r2 around the rotation center ○ of the pin hole 7F). but.

rR2-R4J, the minimum turning space of the self-propelled crane C is reduced by this radius difference, and the turning ability when changing the traveling direction is improved.

In addition, in the above explanations, the Shibu-Muro is referred to as the base Buboom 6A.
Although an example is shown in which the top jib boom 5B is extendable and retractable, the jib boom 6 is not shown in the figure.
It may be configured with only the base jib boom, or a plurality of jib booms may be extendably provided inside the base jib boom 6A, and in either case, substantially the same effect as described above is achieved.

(Effects of the Invention) Since the present invention has the above configuration and performs one function, the following effects can be obtained.

(1) When the jib boom is stored on the side of the base boom of the telescopic boom, by bending the base at the base end of the jib boom toward the lower surface of the jib boom, the width of the lower part of the jib boom in the direction of the inside of the car is reduced.

The minimum turning radius when changing the running direction of the self-propelled crane when the telescopic boom is laid down on the revolving frame of the self-propelled crane and the jib boom is stored on the side of the base boom is as follows: It is smaller than the conventional example that does not have a structure for bending the base toward the lower surface of the base jib boom, and the turning performance of the self-propelled crane when changing the running direction is improved.

(2) With the jib boom stored on the side of the base boom, bend the base with the top pinned to the base end of the jib boom toward the base jib boom side, and before extending the jib boom over the boom head, With the exception of the downward-bent base extending over the end of the jib boom, various cargo handling operations can be performed using almost the same operations as conventional self-propelled cranes of the same type. However, this idea can be implemented by a relatively simple modification that involves rotatably attaching the base to the base of the jib boom.

(3) The minimum turning radius when changing the traveling direction of a self-propelled crane is reduced and its turning performance is improved, which reduces the factors that reduce the degree of freedom in design of self-propelled cranes based on vehicle regulations.

(4) The jib boom can be stored on the side of the telescoping boom, and the jib boom can be rotated around the side of the boom head and extended over the top of the boom head, so that the jib boom and its attachment part can be stored on the top of the telescoping boom or Since it does not protrude downward, when the jib boom is stored on the side of the telescoping boom and travels, there is no fear that the stored jib boom will obstruct the operating view of the self-propelled crane.

(5) During crane work, the jib boom can be continuously raised and lowered as before by extending and contracting the cylinder.

(6) If the cylinder head of the telescoping cylinder is attached to one side of the top of the base with a mounting pin, and the end of the cylinder rod of the telescoping cylinder is pinned to the side of the base jib boom, the shib boom can be used during cargo handling operations. This is because the pressure oil to the telescopic cylinder will act on the cylinder head side.

The pressure-receiving area of the cylinder rod is larger than that in which pressure oil is applied to the cylinder rod side, and therefore, the hydraulic pressure of a telescopic cylinder with the same structure and the same bearing force can be set to a correspondingly lower value. , the seal structure around the telescopic cylinder can be made simpler than in the conventional example.

[Brief explanation of the drawing]

The drawings show an embodiment of the base support device for the jib boom in a self-propelled crane according to the present invention, and FIG. A plane explanatory diagram of the locus circle drawn from the center of rotation of the type crane to the farthest point, Fig. 2 is a side explanatory diagram thereof, Fig. 3 is a side explanatory diagram of the main parts with the jib boom extended, Figs. Figure 5 is IV- of Figure 2.
It is a longitudinal cross-sectional explanatory view along the IV line and the ■-■ line. 10...Telescopic cylinder, 12...Mounting tool, C...Self-propelled crane, KK...Swivel frame. 1...Guide rail, 12a...Shoe...Vehicle frame,

Claims (2)

[Claims] (1) One side of the top of the base is rotatably attached to one side of the base of the jib boom, and both ends of a telescoping cylinder are attached to the other side of the top of the base and the center of the jib boom, and the base On one side of the boom head of a telescopic boom, one side of the base end of which can be raised and lowered on the revolving frame of a self-propelled crane,
The self-propelled device is characterized in that the boom head is rotatably and detachably attached by a mounting pin parallel to a side surface of the boom head, and the other base end of the base is detachably attached to the other side of the boom head. Jib boom base support device for type cranes. (2) The cylinder head of the telescoping cylinder is pinned to one side of the top of the base, and the cylinder rod end of the telescoping cylinder is pinned to the center of the jib boom. Jib boom base support device for self-propelled cranes.