JPH07144886A - Device for projecting and housing auxiliary sheave bracket of wheel type crane - Google Patents

Abstract

PURPOSE:To project and house an auxiliary sheave bracket, which is provided in the tip of a boom, separately from an auxiliary hook. CONSTITUTION:An auxiliary sheave bracket 14 provided with an auxiliary sheave 16, through which a whip rope is passed, is fitted to a boom head 13a freely to be turned around of a horizontal shaft 15 in the bilateral direction between a housing position that the bracket 14 is positioned along the front surface of the tip of the boom, which is under the overturned condition, and a projecting position that the bracket 14 is projected forward from the tip of the boom. A bracket operating cylinder 30 for turning this auxiliary sheave bracket 14 between the projecting position and the housing position is provided between the bracket 14 and the boom head 13a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel type crane such as a rough terrain crane or a truck crane, which is provided with an auxiliary sheave bracket provided with an auxiliary sheave through which an auxiliary hoist rope for raising and lowering an auxiliary hook is provided. The present invention relates to an overhanging / storing device for an auxiliary sheave bracket for overhanging / storing depending on when a crane is traveling.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG.

In the figure, 1 is a crane body, 2 is an operator's cab of the crane body 1, and 3 is a boom mounted on the crane body 1 so that it can be raised and lowered.
An auxiliary sheave bracket 4 is attached to a boom head 3a so as to be rotatable about a horizontal shaft 5 in the left-right direction.

An auxiliary sheave 6 is provided on the auxiliary sheave bracket 4, and an auxiliary hook 8 is attached to the tip of the auxiliary winding rope 7 passed through the auxiliary sheave 6.

9 is a main winding rope, 10 is this main winding rope 9
The main hook 11 is an auxiliary sheave, an idler sheave that guides the main winding ropes 7 and 9, and a main sheave 12 for guiding the main winding rope.

[0006] The auxiliary sheave bracket 4 is set to a projecting position which projects from the boom head 3a obliquely downward and forward (the direction in which the boom is lying down, the same applies to the directions of the parts described below) from the boom head 3a during crane work, as shown in the drawing. When the crane travels, it rotates upward and is stored in the boom head 3a.

By storing the auxiliary sheave bracket 4 in this way, the forward overhang amount of the boom 3 during traveling is reduced, and the front view from the cab is widened.

However, the operation of storing and extending the auxiliary sheave bracket 4 must be performed manually by an operator. Since the bracket 4 is at a high position even when the boom is fully collapsed, the stepladder A as shown in the figure is used. Since it was used at high places, it was troublesome and there was a safety problem.

Therefore, in reality, in many cases, the vehicle travels while the auxiliary sheave bracket 4 is extended in preparation for the large amount of overhang of the boom 3 and the deterioration of the forward visibility.

On the other hand, as a remedy for this point, the applicant of the present invention provides the auxiliary sheave bracket 4 with an auxiliary hook contact surface,
A technique has been proposed in which the auxiliary sheave bracket 4 is rotated to the retracted position by bringing the auxiliary hook 8 into contact with the auxiliary hook contact surface and winding (maximum winding) (Japanese Patent Application No. 5-159327). Japanese Patent Application No. 5-159329).

[0011]

However, the proposed technique has the following drawbacks.

(A) As the auxiliary sheave bracket 4 rotates, relative movement occurs between the auxiliary hook 8 and the auxiliary hook contact surface, and these frictionally rub against each other, which causes an interference sound and the interference causes the auxiliary hook. The contact surface becomes worn, and the paint peels off, making it easy to rust.

(B) Depending on the crane, there is a system in which the auxiliary hook 8 is not wound and stored, but is anchored to the crane body 1 together with the main hook 10 as shown by the phantom line in FIG. Not applicable to such cranes (the auxiliary sheave bracket 4 cannot be stored).

Therefore, the present invention provides an extension / storing device for an auxiliary sheave bracket in a wheel type crane, which is capable of independently extending and storing the auxiliary sheave bracket independently of the auxiliary hook.

[0015]

According to the invention of claim 1, an auxiliary sheave bracket having an auxiliary sheave through which an auxiliary winding rope is passed is provided at the tip of the boom, and the boom collapses around a horizontal axis in the left-right direction. In this state, the auxiliary sheave bracket is rotatably mounted between the retracted position along the front surface of the boom tip and the projecting position projecting to the front of the boom tip. The auxiliary sheave bracket is rotated between the projecting position and the retracted position. A bracket operating cylinder is provided between the bracket and the boom tip.

According to a second aspect of the present invention, in the structure of the first aspect, the auxiliary sheave bracket is provided with a supplementary hook contact surface with which the supplementary hook can abut in a retracted position of the auxiliary sheave bracket.

According to a third aspect of the present invention, in the construction of the first or second aspect, the auxiliary sheave bracket is provided with an overhanging stopper that abuts against the boom tip portion at the overhanging position of the bracket.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the bracket operating cylinder is provided in a fluid pressure supply pipe line connecting the bracket operating cylinder and a fluid pressure supply source provided in the crane body. A cylinder control valve for controlling the cylinder control valve is provided, and the operating lever of the cylinder control valve is provided in the cab of the crane body.

[0019]

With the above construction, the auxiliary sheave bracket can be rotated between the extended position and the retracted position by the expansion and contraction operation of the bracket operating cylinder.

That is, the auxiliary sheave bracket can be independently extended and stored independently of the auxiliary hook.

Therefore, the present invention is also applicable to a crane in which interference noise is not generated due to the relative movement of the auxiliary sheave bracket and the auxiliary hook and the paint of the bracket is not peeled off, and the auxiliary hook is moored and fixed to the crane body. be able to.

According to the second aspect of the present invention, the auxiliary hook can be brought into contact with the auxiliary hook abutting surface of the auxiliary sheave bracket to be stably wound and stored. Moreover, after the auxiliary sheave bracket is stored, the auxiliary hook can be wound and stored, so that interference noise and paint peeling due to their relative movement do not occur.

Further, according to the third aspect of the present invention, since the auxiliary sheave bracket is held in the overhang position by the overhang stopper, the bracket is extended and held by the bracket operating cylinder.
There is no risk that the bracket will bulge and the holding function will deteriorate or be lost due to hydraulic problems such as oil leakage from the cylinder or cylinder control valve.

On the other hand, according to the structure of claim 4, the operation of extending and retracting the auxiliary sheave bracket can be easily and safely performed only by operating the lever in the cab.

[0025]

Embodiments of the present invention will be described with reference to FIGS.

13 is a boom, 13a is a boom head,
On the front side of the boom head 13a, the auxiliary sheave bracket 14 projects forward and obliquely downward as shown in FIG. 1 around a horizontal axis 15 in the left-right direction, and as shown in FIG. It is rotatably attached to a retracted position (running position) along the front surface of the boom head in a standing state in which it is fitted inside 13a.

The auxiliary sheave bracket 14 has an auxiliary sheave 16, a sheave guard 17 for protecting the auxiliary sheave 16, and an auxiliary hook contact surface 1 facing downward in the retracted position.
8, a storage stopper 19 that comes into contact with the front surface of the boom head 13a at the storage position, and a rope guide roller 21 that guides the auxiliary winding rope 20.

Further, the bracket 14 is provided with an overhanging stopper 22 which projects rearward at the overhanging position, and at the overhanging position, the tip of the overhanging stopper 22 is in a stopper receiver 23 provided on the lower front surface of the boom head 13a. The bracket 14 abuts and the bracket 14 is held in the extended position.

Reference numeral 24 is an auxiliary hook, 25 is a main winding rope, and 26
Is a main hook, 27 is an idler sheave, 28 is a main sheave, and 29 is a main hook storage fitting for storing the main hook 26 on the rear surface side of the boom head 13a.

A bracket operating cylinder (hydraulic cylinder) 30 is provided between the intermediate portion of the auxiliary sheave bracket 14 and the rear portion of the boom head 13a.

The bracket operating cylinder 30 has horizontal pins 31 and 32 in the left-right direction, with the rod end of the auxiliary sheave bracket 14 and the head end of the boom head 13a.
The cylinder 30, the auxiliary sheave bracket 14, and the boom head 13a constitute a lever crank mechanism.

33 and 34 are bracket operating cylinders 30
Is a pressure oil supply pipe line provided to the side surface of the boom 13, and has one end connected to the cylinder 30 and the other end connected to a hydraulic pump 35 and a tank 36 (shown in FIG. 3) on the crane body side.

A wheel type crane is usually equipped with a jib, and this jib is extended from the boom head 13a during high lift work. Further, a dibutylt cylinder may be provided in a suspension mechanism that supports the jib as a means for undulating the jib in an extended state.

In this case, the pressure oil supply pipe line for the dibutylt cylinder is provided on the side surface of the boom, and the dibutylt cylinder and the bracket operating cylinder 30 are not operated at the same time.

Therefore, the pressure oil supply pipelines for the dibutylt cylinder can be used as they are as the pressure oil supply pipelines 33, 34 of the bracket operating cylinder.

As shown in FIG. 3, a cylinder control valve 37 for controlling the supply and discharge of pressure oil to and from the bracket operating cylinder 30 is provided in each of the pressure oil supply pipes 33, 34, and an operating lever for operating the valve 37. 38 is shown in FIG.
It is provided in the cab 2 of the crane body 1 shown in FIG.

Thus, by operating the lever 38 from the inside of the operator's cab 2, the cylinder control valve 37 is switched between the neutral position a, the cylinder extending position b on the left side of the figure, and the cylinder contracting position on the right side, and operates. The bracket operating cylinder 30 is configured to extend at the cylinder extension position b and contract at the cylinder reduction position c so that the auxiliary sheave bracket 14 rotates between the extended position and the retracted position.

In FIG. 3, 39 is a safety valve (relief valve).

As described above, since the auxiliary sheave bracket 14 can be independently extended and stored independently of the auxiliary hook 24 by the bracket operating cylinder 30, the auxiliary sheave bracket can be stored by the winding force of the auxiliary hook as in the conventional case. Generation of interference sound due to relative movement between the auxiliary sheave bracket 14 and the auxiliary hook 24,
There is no fear that the paint of the bracket 14 will fall off.

The auxiliary hook 24 can be stored on the front side of the boom head by winding the auxiliary sheave bracket 14 in a retracted state as shown in FIG.

At this time, the upper surface of the auxiliary hook 24 contacts the auxiliary hook contact surface 18 of the bracket 14,
The movement of the auxiliary hook 24 during traveling is suppressed, and a stable auxiliary hook storage state is obtained. Moreover, since relative movement does not occur between the auxiliary hook 24 and the auxiliary sheave bracket 14 at the time of winding the auxiliary hook, problems such as generation of interference noise and peeling of paint do not occur.

Further, since the auxiliary sheave bracket 14 is held in the overhang position by the overhang stopper 22 in the overhang state, the cylinder 30 and the cylinder 30 can be retained as in the case where the bracket 14 is overhang and held by the bracket operating cylinder 30. There is no risk that the overhanging retaining function of the bracket 14 will be deteriorated or lost due to hydraulic trouble such as oil leakage from the piping and the cylinder control valve 37.

Other Embodiments (1) As the bracket operating cylinder 30, a pneumatic cylinder may be used instead of the hydraulic cylinder cylinder described in the above embodiment.

(2) In the above embodiment, the overhang stopper 2 is used.
Although the auxiliary sheave bracket 14 is held in the projecting position by 2 as described above, the bracket 14 may be held in the projecting position by the bracket operating cylinder 30.

(3) The auxiliary sheave bracket 14 need not be provided with the auxiliary hook abutment surface 18 in the crane in which the auxiliary hook 24 is moored and fixed to the crane body.

(4) In the above embodiment, the operating lever 38 of the cylinder control valve 37 is provided in the driver's cab, but the lever 38 and the cylinder control valve 37 can be operated so that the auxiliary sheave bracket 14 can be operated directly. May be provided on the boom 13.

[0047]

As described above, according to the present invention, the auxiliary sheave bracket can be independently extended and stored independently of the auxiliary hook by the expansion / contraction operation of the bracket operating cylinder. Compared to the case where the auxiliary sheave bracket is retracted by the hoisting force of the hook, there is no risk of interference noise due to the relative movement of the auxiliary sheave bracket and the auxiliary hook, and there is no risk of the paint on the bracket coming off. It can also be applied to cranes that are moored and fixed to.

Further, according to the second aspect of the present invention, the auxiliary hook can be brought into contact with the auxiliary hook contact surface of the auxiliary sheave bracket to be stably wound and stored. Moreover, after the auxiliary sheave bracket is stored, the auxiliary hook can be wound and stored, so that interference noise and paint peeling due to their relative movement do not occur.

Further, according to the third aspect of the invention, since the auxiliary sheave bracket is held at the extended position by the overhang stopper, the cylinder can be held by the bracket operating cylinder as in the case where the bracket operation cylinder is used. There is no risk that the bracket will bulge and the holding function will deteriorate or be lost due to hydraulic trouble such as oil leakage from the cylinder control valve.

On the other hand, according to the invention of claim 4, the operation of extending and retracting the auxiliary sheave bracket can be easily and safely performed only by operating the lever in the cab.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention with an auxiliary sheave bracket extended.

FIG. 2 is an enlarged side view of the bracket in a retracted state.

FIG. 3 is a hydraulic circuit diagram of the bracket operating cylinder in the embodiment.

FIG. 4 is a schematic side view of the entire crane for explaining a conventional technique.

[Explanation of symbols]

 13 Boom 13a Boom Head 14 Auxiliary Sheave Bracket 15 Horizontal Shaft as Rotation Center of Auxiliary Sheave Bracket 18 Supplementary Hook Contact Surface 20 Supplementary Rope Rope 22 Overhanging Stopper 24 Supplementary Hook 30 Bracket Operating Cylinder 33, 34 Pressure Oil Supply Pipeline 37 Cylinder Control valve 38 Operation lever of the valve

Claims (4)

[Claims] 1. An auxiliary sheave bracket having an auxiliary sheave, through which auxiliary winding ropes are passed, at a tip end portion of a boom, and a storage position along a front surface of the boom tip end portion in a boom lying state with a horizontal horizontal axis as a center. And a boom operating portion which is pivotally mounted between the boom and the protruding portion of the boom, and which rotates the auxiliary sheave bracket between the protruding position and the retracted position. A device for extending and retracting an auxiliary sheave bracket in a wheel-type crane, characterized in that it is provided between and. 2. The auxiliary sheave bracket is provided with a complementary hook contact surface with which the auxiliary hook can abut in the retracted position of the auxiliary sheave bracket.
Overhanging / storing device for auxiliary sheave bracket in the described wheeled crane. 3. The extension sheave bracket of the wheel type crane according to claim 1, wherein the extension sheave bracket is provided on the auxiliary sheave bracket so as to come into contact with the boom tip portion at the extension position of the bracket. Storage device. 4. A cylinder control valve for controlling the bracket operating cylinder is provided in a fluid pressure supply pipe line connecting the bracket operating cylinder and a fluid pressure supply source provided in the crane body, and an operating lever of the cylinder control valve. The auxiliary sheave bracket overhanging / storing device in the wheel crane according to any one of claims 1 to 3, wherein is provided in an operator's cab of the crane body.