JPS5852191A - Mounting structure of pulley for extension in expansion boom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention has at least three booms that are mutually telescopic, an extension pulley is attached to the tip of the middle boom, and an extension wire loop is hung around the skeleton extension pulley. Attach one end to the base boom, and attach the other end to the base boom. In a telescopic boom that is fixed to the IN3 position and is configured such that the front boom is extended with respect to the intermediate boom only by extending the intermediate boom with respect to the base boom, the extension pulley is attached to the intermediate boom. It is related to a new structure for the purpose of

FIG. 1 diagrammatically shows a three-stage telescopic boom of this type, comprising an intermediate boom (1) and a proximal boom 12 that telescopically supports the intermediate boom (1). )and,
The intermediate boom (11 is extendably supported by the front boom (3) and the intermediate boom RL), and the extension pulley (4) and the crest extension pulley (4) are provided at the tip of the intermediate boom (11) and the intermediate boom rl. At the same time, one end thereof is fixed to the tip part (A) of the base boom (2), and the other end is fixed to the tip part (A) of the base boom (2).
) is fixed to the proximal end position 1 (B) of the nine extension wire p-pull (5), and the intermediate boom (1)? The base boom (
The main components include a hydraulic cylinder (not shown) that extends and retracts the intermediate boom (1) relative to the base boom (2), and a wire rope (5) when the intermediate boom (1) extends relative to the base boom (2).
Accordingly, the front boom (3) is also extended with respect to the intermediate boom (1) at the same time.] Such a telescoping boom itself is commonly used in hydraulic telescoping boom cranes and is well known.

By the way, in this type of telescopic pool, the wire rope for extension tends to have a larger diameter in line with the tendency for cranes to become larger. ) to the diameter (D) (D/d)
It is necessary to make the ratio greater than a certain ratio, and the larger the ratio, the greater the fatigue strength of the rope C5), which is preferable. Here, if we increase the size of the pulley (4) while adopting the structure in which the shaft center of the pulley (4) is located above the main body part F of the intermediate boom mount as before, it is possible to increase the size of the pulley (4) using the wire rope (6 ) will need to be moved to a higher level, and that's it! :The sheave block (7) t- installed at the tip of the tl forward 7'-m (3) is also large and therefore needs to be increased in weight, which is within the range of the limited overturning moment of the crane. This is not preferable as it will reduce the lifting capacity of the crane (D).

This invention was made in view of the above background, and the shaft center of the extension pulley is not located above the telescopic boom as in the past, but is positioned in the middle of the telescopic boom, thereby increasing the amount by which the extension pulley protrudes upward. If this is done, the axis of the extension pulley will be located on both side plates of the front boom, but in the present invention, the extension pulley is not attached. By devising the structure, it was possible to increase the boom width of the front boom, that is, the dimension between its both side plates, and thus to increase the rigidity of the front boom as much as possible. De),
In the mounting structure of the present invention, each extension pulley is arranged at the tip of the intermediate boom and at both parts of the forward boom in a plan view perpendicular to the axis of the telescopic boom, and The axes of the extension pulleys are arranged in a V-shaped relationship, and each extension pulley has a U-shaped cross section with a wall plate on the outside of the circle, and a steel plate bracket continuous to the boom in the middle. ), the valley extension pulley is pivotally supported by a headed shaft that penetrates the circular outer wall plate of the bracket from the outer wall plate side, and the headed shaft is located inside the sandalwood part of the bracket. It is characterized by being secured with a pin.

Below are the second to second examples of the present invention adopted in a four-stage telescopic boom.
This will be explained in detail using Figure 4.

(1), (2), (3), (4), (7) in the figure
corresponds to No. ff in FIG. Therefore, in this example, a 4-stage telescoping boom is constructed by comprising a basic boom (8) further having a hydraulic cylinder at the base of the base boom (21).Also, (9) tj' sheave block This is an auxiliary winding pulley for the auxiliary winding wire rope provided in front of (7).

Figure 4 shows the mounting structure of the extension pulley projected on the plane along line ff-4 in Figure 2, that is, perpendicular to the axis of the telescopic boom.
This will be explained using figures. In the figure, (7) is a sheave block installed in front of the front boom (3), and it is a sheave block formed by extending both side plates of the front boom (3) (7a) and (7b). The ship block [7] has a main hoisting pulley 01 and an auxiliary hoisting pulley 61 above it, and a main hoisting pulley group 4 below it. The main winding wire rope (6) wound around the winding drum is wound around pulleys QQ and (2) and the pulley group of the main winding hook (not shown), and the auxiliary winding wire rope (6) wound around the auxiliary winding drum is Pulley α sword.

(9), and the structure of two or more is normal.

In Fig. 4, (4) is an extension pulley. Only one pulley is shown at the waist, but this pulley (4) is connected to the boom (3) at the front.
)' are arranged in pairs on both sides with the center of the wheel located in the middle of the front boom (3), and the center of both wheels are inclined as shown in the figure, so that they are in a horizontal relationship with each other. It is in. Q
:In A bracket provided at the front end of the middle bunim (1), the bracket (to) has a U-shaped cross section consisting of the outer wall plate (13a), the inner wall plate (13b), and the ceiling wall plate (23Q). The inner wall plate (tab) is on the same plane as the outer wall plate (1a) of the intermediate boom (1), and the outer wall plate (13a) protrudes outward as can be understood from FIG. There is. O
e is a headed shaft for a pulley that has a head @ (16a) on one side and a bottle hole (1ob) for a retaining bottle on the other side; Exterior wall board (13!
L) Boss of s pulley (4), bracket) Penetrates the inner wall plate (13b) of Qi. Q4 is the above platform) 0
30 is a retaining bottle placed inside the inner wall plate (13b), and the lower end of the retaining bottle α4 has a bottle hole (
16b), while the upper end extends above the bracket (to), and the plate fixed to the upper end is overlapped with the top wall plate (13c) of bracket a).
It can be fixed freely at IF5. In the figure, (11) indicates -S of the bottom wall plate constituting the intermediate boom (1), and (Wl) indicates the width between both inner wall plates (1a) of the intermediate boom (1) in % (W
l) indicates the width between the outer wall panels of the forward boom (3). (5
) Co., Ltd. A wire rope for expansion and contraction is provided at A, one end of which extends outward from the tip of the differential boom (2), and is connected to the bracket (A).
), the other end is fixed to a metal fitting (not shown) protruding outward from the proximal end of the front boom (3), and a pulley (
4).

In the above structure, the extension of the intermediate boom (1) with respect to the differential force boom (2) is the same as that of the conventional one, in which the front boom (3) is extended with respect to the intermediate boom (1).

The order of assembling the board will be explained. The width between the outer surfaces of both outer wall plates of the front boom (370) is (Wl).As mentioned above, the outer wall plate of the intermediate boom (1) is 1a) There is a protrusion, also commonly referred to as a side para, that guides along the inner surface of the
Therefore, when the pulley (4) and the like are assembled in the manner shown in Figure 4, it is impossible to insert the front boom (3) into the intermediate boom (1). So Bin (141, headed axis Qfl
Pull it out, remove the pulley (4), leave it as fc, and move it to the other end of the pool (
3), insert the front boom (3) into the intermediate boom (1) with one end of the wire rope (5) fixed to the base end,
Next, the pulley (4) is placed in a predetermined position, penetrates the headed shaft 0→ from the outside, inserts the bottle 04 from above, and then the bottle a4
is bolted (to), and the other end of the rope r5) is fixed to the bracket (A) to complete the assembly.

Since this invention is constructed as described above, firstly, the shaft for the pulley (4) is a headed shaft aQ, the screw 1 is arranged at an angle, and the pin α is used to prevent the pulley (4) from slipping out. Since it is a slope type, even if the m- of the lower end of the pulley (4) is within the width (Wl), the headed shaft aQO shaft tip +1!1lt- can be placed as far outward as possible, so that the front boom (3) The width (Wg) of the bracket can be made as large as possible and the rigidity can be made as large as possible, and secondly, the inner and outer wall plates (13t+) (1!1m) of the bracket 0 are
Since it is located between the head (16a) of
a) There is a risk that (13b) may open. Thirdly, since the head shaft 0Q is prevented from coming out using a bottle method, it is extremely easy to install the bottle 0◆ even though it is a so-called bag part. It has many effects, such as the ability to assemble the paper into a fan.

[Brief explanation of drawings]

) It is a longitudinal side view along the W line. (11; Intermediate pool (2); One-way pool C3):
Front boom C4): Extension pulley (5): Extension wire rope (to) 2 brackets (1a&): External wall board
(13k)) :Inner 1 plate °α Groan: Headed axis α
4=Bin Patent applicant: Kobe Steel, Ltd.

Claims (1)

[Claims] It has at least three mutually telescopic booms, an extension pulley is attached to the tip of the intermediate boom, and one end of an extension wire rope wrapped around the extension pulley is fixed to the base boom. In addition, the other end is fixed to the proximal end of the boom at the front, and the boom is configured such that the boom at the front can be extended relative to the intermediate boom simply by extending the intermediate boom relative to the boom at the base. , each extension pulley is arranged at the tip of the intermediate boom and on both sides of the front boom in a plan view perpendicular to the axis of the telescopic boom, and the axes of both extension pulleys are aligned. Each extension pulley has a U-shaped cross section with inner and outer wall plates, and is covered with a steel plate bracket continuous to the intermediate boom. A telescoping boom, characterized in that it is pivotally supported by a headed shaft penetrating the inner and outer wall plates of the bracket from the outer wall plate side, and the headed shaft is prevented from coming off by a bin located inside the inner wall of the bracket. Mounting structure of extension pulley in.