JPS6310208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applicable to high-temperature working machines, aerial work vehicles, etc. that remove slag and base metal adhering to the mouth of a converter.
The present invention relates to a boom device used as a working arm of various working machines in which the base of the machine is installed at a position away from the workpiece.

(Prior art) For example, in a steel mill, removing slag and metal (hereinafter referred to as deposits) adhering to the mouth of a converter, and removing bricks when replacing refractory bricks on the inner wall of a converter or ladle. Work such as removal is performed periodically or as needed.

In order to prevent heat loss from the converter, etc., such work must be performed under high heat while the converter remains at a high temperature. It must be done from

Conventionally, this high-temperature work, for example when removing deposits, has been done manually by workers, such as scraping the deposits with the tip of a log held in their hands, which is extremely inefficient. At the same time, the work was extremely dangerous due to the unavoidable effects of radiant heat and the generation of flying sparks and dust.

Under these circumstances, there has been a demand for the development of a work machine that can safely and efficiently perform high-temperature work using mechanical power rather than human power.

The structure of this high-temperature work machine is that the work arm is attached to a machine base that is set at a position far from the workpiece.
It is conceivable to attach a working attachment to the tip of this working arm for scraping off deposits or the like. In this case, the working arm may be a bendable and extendable arm structure that is used in hydraulic excavators, for example. However, with this arm-type work arm, the reach (work radius) is changed by the joint movement of the arm body that makes up the work arm, and if you try to change the length of the work arm, the tip position will also change up or down. The position of the work attachment varies greatly, making it troublesome to adjust the position of the work attachment relative to the workpiece.

On the other hand, it is also conceivable to adopt a telescopic boom structure used in hydraulic truck cranes for the working arm. According to this boom structure, since the length of the working arm changes linearly, the position of the working attachment can be adjusted more easily than in the case of the above-mentioned bending/extending arm structure. However, conventionally known booms, for example, in the case of a two-stage boom, have a structure in which an inner boom body is fitted in and out of an outer boom body attached to a base machine.
Since the boom length is extended and contracted only by the movement of the inner boom body, the ratio of change in boom length (boom length when extended/boom length when retracted) is not very large. Therefore, in order to extend the reach, the lengths of both the outer and inner boom bodies must be increased, or the number of boom stages must be increased. However, with the former method of lengthening the boom itself, the boom occupies a large space when the boom is contracted.
This is disadvantageous for indoor work and movement, such as the above-mentioned work for removing deposits from the converter. Furthermore, the latter method of increasing the number of boom stages increases the cost of equipment such as the boom and the telescopic cylinder. Furthermore, both methods increase the weight of the boom, and the machine base supporting the boom must also be larger and heavier.

(Objective of the Invention) Therefore, the present invention provides a boom device used in high-temperature working machines, etc., which allows easy adjustment of the position of work attachments, has good boom expansion and contraction efficiency, and can obtain a large reach with a short boom length. It is something to do.

(Structure of the Invention) The present invention is characterized in that it includes a boom support that is attached to a machine base so as to be able to raise and lower, a luffing cylinder that raises and lowers this boom support, and a boom that is supported by the boom support. , this boom includes an outer boom body which is movable in the boom axis direction with respect to the boom support body and rotatably supported around the boom axis, and an outer boom body which is movable in the axial direction with respect to the outer boom body and is supported rotatably around the boom axis. and a boom rotation means for rotating the outer boom body of the boom around the boom axis; A high-temperature system comprising a boom telescoping cylinder that extends and retracts the boom by moving the inner boom body in the axial direction, and boom position fixing means that can fix the outer boom body in at least two positions in the axial direction with respect to the boom support. It is found in boom devices used for work machines, etc.

(Example) In this example, a case will be explained in which the device of the present invention is applied as a working arm of a high-temperature working machine. It can be applied to various types of work machines (e.g. aerial work vehicles, etc.) installed in

1 is a machine base, and A is a boom device attached to this machine base 1. The machine base 1, like a base machine such as a hydraulic excavator, is composed of a crawler-type lower traveling body 1a and an upper rotating body 1c mounted on the lower traveling body 1a via a swing bearing 1b. An operator's cab 11 is provided in the upper revolving body 1c of this machine 1, and a main operating section 12 is provided in the operator's cab 11, and a sub-operating section is provided on both left and right side surfaces of the rotating body so as to be rotatable around a vertical axis. Various operations of the boom device A can be controlled by any one of the operating sections 13 and 14.

The boom device A is connected to the upper revolving structure 1c of this machine base 1.
It is attached to the top of the. This boom device A includes a boom 2 configured to be extendable and retractable in a telescopic manner by both outer and inner boom bodies 2a and 2b.
and a boom support body 3 that supports this boom 2, and a ripper 4 for scraping off deposits as a work attachment is provided at the tip of the boom 2 (the tip of the inner boom body 2b) in this boom device A.
is installed.

The lower end of the boom support 3 is pivotally connected to the bracket 15 of the upper revolving structure 1c via a horizontal axis 16, and the boom support 3 can be rotated up and down about the horizontal axis 16 by a hoisting cylinder _C1 . That's what I do. This boom support body 3 has a cylindrical boom holder 31 on the upper part, and a cylindrical interlocking drum 21 is mounted inside the boom holder 31, with a bearing 22 at one end in the axial direction and a plurality of supports in the circumferential direction at the other end. It is fitted so that it can rotate around the drum axis while being supported by rollers 23. In Figures 4 and 5, m
is a motor for rotationally driving this rolling drum 21 (hereinafter referred to as a boom rotation motor), and is attached to the outer periphery of the boom holder of the boom support 3. A pinion gear g ₁ is attached to the rotating shaft of this motor m, and by meshing this pinion gear g ₁ with a ring gear g ₂ fixed to the outer circumference of the outer ring of the rolling drum support bearing 22, the rotation of the motor m is controlled by the gears g ₁ and _g2 to the rolling drum 21.

The outer boom body 2a of the boom 2 is formed into a rectangular tube shape, and is fitted into the rolling drum 21 so as to be able to slide in the axial direction while passing through the drum 21. A pad 21a that is in contact with the outer peripheral surface of the outer boom body 2a is fixed to the inner peripheral surface of the rolling drum 21, and this pad 21a allows the rolling drum 2
1 to the outer boom body 2a, and supports the outer boom body 2a so as to be slidable in the axial direction.

When the work equipment is moved, the outer boom body 2a is set in a retreat position where the amount of forward protrusion from the rolling drum 21 is small, as shown in FIGS. 1 to 3, and the reach ( When it is desired to maximize the working radius), as shown in FIG. 7, the rotating drum 21 is moved to a forward position where it protrudes forward as much as possible by means described later. The boom support body 3 has a fixing pin 32 for fixing the outer boom body 2a in both the backward and forward positions, which can be screwed up and down through a bracket 33 at the bottom of the rear end. (possible). On the other hand, the outer boom body 2a is provided with pin holes (hereinafter referred to as front pin holes and rear pin holes) h ₁ and h ₂ on the lower surface of the axially intermediate portion and the rear, and the fixing pin 32 is inserted into the outer boom body when the outer boom body is retracted. Front pin hole in position H ₁
By inserting the outer boom body _2a into the rear pin hole h2 at the forward position, the outer boom body 2a can be fixed at both positions.

The inner boom body 2b has a square box-shaped tip block _2b2 fixed to the tip of a main body part 2b1 that is slidably fitted in the outer boom body _2a in the axial direction, and a hollow bifurcated ripper is attached to the tip block _2b2 . It consists of parts 2b and ₃ which are integrally connected. Main body part 2
b ₁ is equipped with four pipes 24... at the four corners,
It is formed into a rectangular cylindrical shape corresponding to the outer boom body _2a , and each pipe 24 of the main body portion 2b1 is supported by eight guide rollers 25 at two locations at the front of the outer boom body 2a. By this guide roller 25..., the inner boom body 2
b is supported so as to be freely slidable in the axial direction, and
The rotation of the outer boom body 2a is caused by the rotation of the inner boom body 2b.
is transmitted, and both boom bodies 2a, 2b rotate integrally around the boom axis. C ₂ is a boom telescopic cylinder provided at the axial center of the boom 2. The bottom of the cylinder is fixed inside the rear end of the outer boom body 2a, and the rod end is attached to a bracket 26 inside the inner boom body 2b _1. It is stopped through. Due to this telescopic operation of the cylinder _C2 , the inner boom body 2b slides in the axial direction, and the boom 2 performs a so-called one-stage converging and retracting action.

The ripper 4 is rotatably (angle adjustable) attached to the ripper mounting portion _2b3 at the tip of the inner boom body via a pivot shaft 41. C ₃ is a Ritsupa cylinder,
Connect the cylinder bottom to the inner boom main body part 2b ₁
It is fixed to the inner bracket 26, and the rod end is fixed to the upper part of the ripper 4 via the push rod 42. 43 is an idler link installed between the push rod 42 and the inner surface of the tip block _2b2 ;
44 is a shaft connecting the idler link 43 and the push rod 42, 45 is a shaft connecting the idler link 43 and the tip block _2b2 , and 46 is a shaft connecting the tip of the push rod 42 and the ripper 4. The lipper 4 has a front claw 4 directly on the lower front part.
(a) At the rear thereof, there are rear claws 4b bent backwards, and these two claws 4a and 4b can be used appropriately depending on the situation of the object to be worked on.

Note that the tip block 2 of the inner boom body 2b
b ₂ , the ripper mounting part 2b ₃ and the ripper 4, and the ripper operating mechanism such as the ripper cylinder C ₃ are directly connected to each other.
Since they are exposed to high heat, it is necessary to take these cooling measures to prevent overheating. Therefore, in this boom device A, the main body 2 of the inner boom body 2b is
Cooling water is supplied to and recovered from the boom tip structures such as the ripper 4 through the four pipes 24 constituting _b1 . That is,
The tip block _2b2 has a double-wall structure as shown in FIGS. 8 to 10, and a space S formed between the inner and outer walls is partitioned in the circumferential direction by a large number of partition walls 27. A large number of tunnel-like channels 28, 2
8a and 28b are formed. In addition, in FIG. 10, illustration of the structure inside the tip block _2b2 is omitted. These channels 28, 28a, 28b are
It is divided into two systems: a tip block system that cools the area around the tip block _2b2 , and a ripper system that cools the ripper mounting part _2b3 and the ripper 4. Among the four pipes 24 of the inner boom main body part _2b1 ... Two pipes (lower left and upper right pipes in Figure 10) are used to send and return cooling water to the tip block system, and the other two pipes (lower right and upper left pipes in Figure 10) are used to feed cooling water to the lipper system. I plan on using them each on my way back.

In FIGS. 8 to 10, 28a indicates the cooling water supply channel of the ripper system, 28b indicates the same return channel, and many channels 28 other than these indicate the cooling water circulation channels of the tip block system. . The circulation passages 28 are sequentially connected to each other at one end, and the cooling water flows in a meandering manner around the four circumferences of the tip block 2b ₁ through the circulation passages 28, thereby cooling the tip block 2b ₁ . In Figure 10, ○†g

Claims (1)

[Claims] 1. A boom support mounted on a machine base so as to be able to raise and lower, a luffing cylinder for raising and lowering this boom support, and a boom supported by the boom support,
This boom includes an outer boom body that is movable in the boom axis direction with respect to the boom support body and rotatably supported around the boom axis, and an outer boom body that is movable in the axial direction with respect to the outer boom body and is supported so as to be rotatable around the boom axis. and an inner boom body integrally and rotatably fitted to the boom body, and a boom rotating means for rotating the outer boom body of the boom around the boom axis, and an inner boom body of the boom. The boom includes a boom telescoping cylinder that moves the boom body in the axial direction to extend and retract the boom, and a boom position fixing means that can fix the outer boom body in at least two positions in the axial direction with respect to the boom support body. Features: Boom device used for high-temperature work equipment, etc.