JP2660153B2 - Projection and storage device of auxiliary sheave bracket for wheel type crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an auxiliary sheave bracket provided with an auxiliary sheave through which an auxiliary hoist rope for raising and lowering an auxiliary hook is attached to a wheel crane such as a rough terrain crane and a truck crane. The present invention relates to a projecting / retracting device for an auxiliary sheave bracket for projecting / retracting in accordance with traveling of a crane.

[0002]

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

In FIG. 1, reference numeral 1 denotes a crane main body, 2 denotes a cab of the crane main body 1, and 3 denotes a boom mounted on the crane main body 1 so as to be able to move up and down.
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.

[0004] The auxiliary sheave bracket 4 is provided with an auxiliary sheave 6, and an auxiliary hook 8 is attached to a tip of an auxiliary rope 7 passed through the auxiliary sheave 6.

[0005] 9 is a main winding rope, 10 is this main winding rope 9
The reference numeral 11 denotes an idler sheave for guiding the auxiliary winding and the main winding ropes 7 and 9, and 12 denotes a main sheave for the main winding rope guide.

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

[0007] By storing the auxiliary sheave bracket 4 in this manner, the amount of forward overhang 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 manually performed by an operator, and since the bracket 4 is at a high position even when the boom is in the maximum lying state, the stepladder A as shown in FIG. Since the work was performed at a high place, it was troublesome and had safety problems.

For this reason, in practice, the boom 3 often travels with the auxiliary sheave bracket 4 extended so that the overhang of the boom 3 is large and the forward visibility is deteriorated.

On the other hand, as a measure for improving this point, the present applicant has provided an auxiliary hook contact surface on the auxiliary sheave bracket 4,
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 up (winding up to the maximum) (Japanese Patent Application No. 5-159327; Japanese Patent Application No. 5-159329).

[0011]

However, the proposed technique has the following drawbacks.

(A) With the rotation of the auxiliary sheave bracket 4, a relative motion is generated between the auxiliary hook 8 and the auxiliary hook contact surface, and these rub against each other, so that an interference sound is generated and the interference causes the auxiliary hook. The contact surface is worn, and the coating is peeled off and rust easily.

(B) Some cranes do not store the auxiliary hooks 8 in a rolled state, but instead anchor the main hooks 10 together with the main hooks 10 to the crane main body 1 as shown by phantom lines in FIG. It cannot be applied to such a crane (the auxiliary sheave bracket 4 cannot be stored).

Accordingly, the present invention provides an overhanging / retracting device for an auxiliary sheave bracket in a wheel type crane which can independently extend and store an auxiliary sheave bracket independently of an auxiliary hook.

[0015]

According to a first aspect of the present invention, an auxiliary sheave bracket having an auxiliary sheave through which an auxiliary rope is passed is provided at the end of the boom. The auxiliary sheave bracket is pivotally mounted between a retracted position along the front surface of the boom tip in the state and an extended position protruding forward of the boom tip, and pivots the auxiliary sheave bracket between the extended position and the retracted position. A bracket operation cylinder to be operated is provided between the bracket and the boom tip.

According to a second aspect of the present invention, in the configuration of the first aspect, the auxiliary sheave bracket is provided with an auxiliary hook contact surface with which the auxiliary hook can be brought into contact with the auxiliary hook at the storage position of the bracket.

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

According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the bracket operation cylinder is provided in a fluid pressure supply pipe connecting the bracket operation cylinder and a fluid pressure supply source provided in the crane body. Is provided, and an operation lever of the cylinder control valve is provided in an operation room of the crane main body.

[0019]

According to 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 operation cylinder.

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

Accordingly, the present invention is also applicable to a crane which does not generate interference noise due to the relative movement of the auxiliary sheave bracket and the auxiliary hook, does not cause the coating of the bracket to peel off, and adopts a method of mooring and fixing the auxiliary hook to the crane body. be able to.

Further, according to the configuration of the second aspect, the auxiliary hook can be stably stored by being brought into contact with the auxiliary hook contact surface of the auxiliary sheave bracket. In addition, after the auxiliary sheave bracket is stored, the auxiliary hook may be wound and stored, so that the generation of interference sound and the peeling of the paint due to the relative movement do not occur.

Further, according to the third aspect of the present invention, the auxiliary sheave bracket is held at the extended position by the extended stopper, so that the bracket is extended and held by the bracket operating cylinder.
There is no danger that the bracket will overhang and lose or lose its function due to hydraulic problems such as oil leakage from the cylinder or cylinder control valve.

On the other hand, according to the configuration of the fourth aspect, the operation of extending and retracting the auxiliary sheave bracket can be performed simply and safely only by operating the lever in the cab.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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, an auxiliary sheave bracket 14 projects forward and obliquely downward with respect to a horizontal axis 15 as shown in FIG. 1 and a part of the boom head as shown in FIG. It is mounted so as to be rotatable between a storage position (a traveling position) along the front surface of the boom head in an upright state fitted into the inside of the boom head 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 at the storage position.
8, a storage stopper 19 that contacts the front surface of the boom head 13 a at the storage position, and a rope guide roller 21 that guides the auxiliary hoisting rope 20.

The bracket 14 is provided with an overhanging stopper 22 projecting rearward at the overhanging position. At the overhanging position, the tip of the overhanging stopper 22 is attached to a stopper receiver 23 provided at the lower front surface of the boom head 13a. The bracket 14 is held in the overhang position in abutment.

24 is a supplementary hook, 25 is a main winding rope, 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 side of the boom head 13a.

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

The bracket operating cylinder 30 has horizontal rods 31 and 32 extending in the left and right directions, with the rod end on the auxiliary sheave bracket 14 and the head end on the boom head 13a, respectively.
The cylinder 30, the auxiliary sheave bracket 14, and the boom head 13 a constitute a lever crank mechanism.

Reference numerals 33 and 34 denote bracket operating cylinders 30.
And one end is connected to the cylinder 30 and the other end is connected to a hydraulic pump 35 and a tank 36 (shown in FIG. 3) on the crane body side.

The wheel type crane is usually equipped with a jib, and this jib is extended from the boom head 13a during a high-lift operation. In addition, as a means for raising and lowering the jib in an extended state, a dibutylt cylinder may be provided in a suspension mechanism that supports the jib.

In this case, a pressure oil supply line for the dibutyl cylinder is provided on the side of the boom, and the dibutyl cylinder and the bracket operating cylinder 30 are not operated simultaneously.

Therefore, the pressure oil supply line for the dibutyl cylinder can be used as it is as the pressure oil supply line 33, 34 for the bracket operation 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 operation cylinder 30 is provided in the pressure oil supply pipes 33 and 34, and an operation lever for operating the valve 37 is provided. FIG.
Are provided in the operator's cab 2 of the crane main body 1 shown in FIG.

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

In FIG. 3, reference numeral 39 denotes a safety valve (relief valve).

As described above, since the auxiliary sheave bracket 14 can be extended and stored independently of the auxiliary hook 24 by the bracket operating cylinder 30, the auxiliary sheave bracket can be stored by the lifting force of the auxiliary hook as in the prior art. The generation of interference noise due to the relative movement of the auxiliary sheave bracket 14 and the auxiliary hook 24,
There is no danger of the coating of the bracket 14 coming off.

The auxiliary hook 24 can be stored in the front side of the boom head by cutting off the auxiliary sheave bracket 14 as shown by a virtual line in FIG.

At this time, the upper surface of the auxiliary hook 24 comes into contact with the auxiliary hook contact surface 18 of the bracket 14 so that
The swing of the auxiliary hook 24 during traveling is suppressed, and a stable auxiliary hook storage state is obtained. In addition, since the auxiliary hook 24 and the auxiliary sheave bracket 14 do not move relative to each other when the auxiliary hook is unwound, problems such as generation of interference noise and peeling of the coating do not occur.

Further, since the auxiliary sheave bracket 14 is held at the extended position by the extended stopper 22 in the extended state, the bracket 30 is extended and held by the bracket operating cylinder 30 as in the case where the bracket 30 is extended. There is no danger that the extension holding function of the bracket 14 will be reduced or lost due to hydraulic problems such as oil leakage from the piping and the cylinder control valve 37.

Other Embodiments (1) As the bracket operation 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
2, the auxiliary sheave bracket 14 is held at the overhang position, but the bracket 14 may be held at the overhang position by the bracket operation cylinder 30.

(3) In a crane in which the auxiliary hook 24 is moored and fixed to the crane main body, the auxiliary hook contact surface 18 may not be provided on the auxiliary sheave bracket 14.

(4) In the above embodiment, the operation lever 38 of the cylinder control valve 37 is provided in the operator's cab. May be provided on the boom 13.

[0047]

As described above, according to the present invention, the auxiliary sheave bracket can be extended and retracted independently of the auxiliary hook by the expansion and 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 danger of interference noise due to the relative movement of the auxiliary sheave bracket and the auxiliary hook, and there is no danger of the coating of the bracket coming off, and the auxiliary hook is connected to the crane body The present invention can also be applied to a crane having a mooring method.

Further, according to the second aspect of the present invention, the auxiliary hook can be stably wound and stored by contacting the auxiliary hook contact surface of the auxiliary sheave bracket. In addition, after the auxiliary sheave bracket is stored, the auxiliary hook may be wound and stored, so that the generation of interference sound and the peeling of the paint due to the relative movement do not occur.

Further, according to the third aspect of the present invention, since the auxiliary sheave bracket is held at the overhang position by the overhang stopper, the bracket is operated by the bracket operating cylinder so that the bracket is operated by the bracket operating cylinder. There is no danger that the bracket will protrude and lose or lose its function due to hydraulic troubles such as oil leakage from the cylinder control valve.

On the other hand, according to the fourth aspect of the present invention, the operation of extending and retracting the auxiliary sheave bracket can be performed simply and safely only by operating the lever in the cab.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view of the same bracket stored state.

FIG. 3 is a hydraulic circuit diagram of a bracket operation 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 Axis Becoming Rotation Center of Auxiliary Sheave Bracket 18 Auxiliary Hook Contact Surface 20 Auxiliary Rope 22 Overhang Stopper 24 Auxiliary Hook 30 Bracket Operating Cylinder 33, 34 Hydraulic Oil Supply Pipe 37 Cylinder Control valve 38 Operating lever of the valve

Claims (4)

(57) [Claims] An auxiliary sheave bracket having an auxiliary sheave through which an auxiliary rope is passed is provided at the end of the boom, and a storage position along a front surface of the boom tip in a boom-down state with the horizontal axis as a center. And a bracket operation cylinder that is rotatably mounted between an overhang position protruding forward of the boom tip and the auxiliary sheave bracket between the overhang position and the storage position. And an extension device for an auxiliary sheave bracket in a wheeled crane. 2. The auxiliary sheave bracket is provided with an auxiliary hook contact surface with which the auxiliary hook can be brought into contact with the auxiliary hook in the retracted position at the storage position of the bracket.
An overhanging / retracting device for an auxiliary sheave bracket in the wheeled crane described in the above. 3. The extension of the auxiliary sheave bracket for a wheel type crane according to claim 1, wherein the auxiliary sheave bracket is provided with an extension stopper which comes into contact with the boom tip at the extension position of the bracket. Storage device. 4. A cylinder control valve for controlling a bracket operation cylinder is provided in a fluid pressure supply line connecting a bracket operation cylinder and a fluid pressure supply source provided on a crane body, and an operation lever of the cylinder control valve is provided. The extension and storage device for an auxiliary sheave bracket in a wheel type crane according to any one of claims 1 to 3, wherein the device is provided in a cab of the crane body.