JPH0710474A - Auxiliary hook storing device for wheel crane - Google Patents

Abstract

PURPOSE:To increase an approach angle and a departure angle during running of a crane of a type such that an auxiliary hook is stored in the front end part of a boom in a complete wind-up condition, and to increase the lifting height during operation of the crane, by increasing the ground height of the auxiliary hook in the stored condition. CONSTITUTION:An auxiliary sheave bracket 3 is provided so as to be rotatable between an extended position where it is projected forward from a boom head 2, and a retracted position where it is laid along the front surface of the boom head 2, and is stored at the front surface of the boom head 2 through a section in which it is automatically rotated by a rotational moment given by a rope tension, when the bracket 3 is rotated by a wind-up force of an auxiliary hook 6. Accordingly, the auxiliary hook 6 is stored being completely wound up to the auxiliary sheave bracket 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary hook storage device for winding and storing auxiliary hooks in a wheel type crane such as a rough terrain crane or a truck crane when traveling.

[0002]

2. Description of the Related Art In general, a wheel type crane is provided with a main hook used for low-speed lifting work of heavy objects and an auxiliary hook used for high-speed lifting work of lightweight objects.

This auxiliary hook is hung from the tip of the boom by a single rope auxiliary winding rope with respect to the main hook suspended by a double rope main winding rope.

Conventionally, as a device for storing the auxiliary hook, a hook mooring rope is generally attached to the front end of the lower traveling body, and the auxiliary hook is hooked on the mooring rope to moor and store the auxiliary hook.

However, according to this conventional device, the driver must leave the operator's cab and hang the auxiliary hook on the mooring rope every time the auxiliary hook is stored during traveling of the crane and the auxiliary hook is released during crane operation. This had to be troublesome.

Therefore, as disclosed in Japanese Unexamined Patent Publication No. 4-341496, a hook storage metal fitting is hung on the boom tip end portion in a state of being rotatable about a horizontal horizontal axis, and an auxiliary hook is wound during traveling of the crane. A technique has been proposed in which, by cutting (winding to the maximum), the storage metal fitting is rotated upward by this auxiliary hook winding force and the auxiliary hook is stored under the boom tip together with the storage metal fitting.

[0007]

However, this known technique has the following drawbacks.

Since the auxiliary hook is stored under the boom tip portion, the ground height of the auxiliary hook in the retracted state is low. Therefore, the approach angle (hill entry angle) and departure angle (hill exit angle) during traveling are reduced.

During crane work, the lifting height is reduced by the amount by which the auxiliary hook storage fitting hangs from the boom tip.

In view of the above, the present invention is a supplementary type of wheel-type crane capable of increasing the approach angle and departure angle during traveling of a crane and the lift during crane operation in a system in which a supplementary hook is wound and stored on the boom tip end portion. A hook storage device is provided.

[0011]

The invention according to claim 1 has the following construction.

(I) An auxiliary sheave bracket having an auxiliary sheave through which the auxiliary winding rope is passed is attached to the boom tip end portion along the front surface of the boom tip end portion in the boom fall state with the horizontal axis in the horizontal direction as the center. And the protruding position that protrudes forward of the boom tip, and is mounted so as to be rotatable.

(II) The auxiliary sheave bracket is constructed so that a turning moment due to its own weight and a turning moment due to the tension of the auxiliary winding rope act.

(III) The sum of the rotation moments in the boom fall state works in the extension direction in the initial storage section from the extension position of the auxiliary sheave bracket toward the storage position, and in the storage direction in other sections. As described above, the conditions that determine both moments must be set.

(IV) The auxiliary sheave bracket is provided with a first contact surface with which the auxiliary hook can abut in the initial storage section and a second contact surface with which the auxiliary hook can abut in the final storage section. To be.

(V) An extension stopper for holding the auxiliary sheave bracket in the extension position is provided.

According to a second aspect of the present invention, in the structure of the first aspect, a moment generating means for generating a moment against the stored moment is provided in the final storage period of the auxiliary sheave bracket.

According to a third aspect of the present invention, in the structure of the second aspect, the moment generating means is a main winding rope that suspends the main hook by being passed through the main winding sheave in the boom front end portion, and the main winding rope in the final storage period. And a pressing member provided on the auxiliary sheave bracket so as to be pressed against the main winding rope.

According to a fourth aspect of the present invention, in the structure of the second aspect, a spring is provided as a moment generating means between the auxiliary sheave bracket and the boom tip.

[0020]

According to the above construction, (a) when the auxiliary hook is wound up from the working state, the auxiliary hook comes into contact with the first contact surface of the auxiliary sheave bracket, and the auxiliary hook winding force causes the bracket to move within the initial storage section. Rotate in the storage direction.

(B) Next, when the initial storage section ends, the auxiliary sheave bracket automatically rotates in the storage direction in the remaining section due to the storage moment, and following this, the auxiliary hook is wound up, and the second By contacting the contact surface, the auxiliary hook can be stored on the front surface of the boom tip.

On the other hand, when the auxiliary hook is lowered to the ground from this stored state and the auxiliary winding rope is loosened, the moment in the storage direction due to the tension of the rope disappears, so the auxiliary hook automatically rotates in the extension direction. , It is held in the overhang position by the overhang stopper.

Further, according to the structure of claims 2 to 4, at the end of the storage of the auxiliary sheave bracket, the moment in the extension direction is generated by the moment generating means (main winding rope and pressing member in claim 3, spring in claim 4). Since it acts, it acts as a storage brake, and the shock during storage is mitigated. In addition, the moment of the bulging direction by the moment generating means ensures the bulging operation of the auxiliary sheave bracket.

[0024]

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

First Embodiment (Refer to FIGS. 1 to 5) In FIGS. 1 to 4, reference numeral 1 denotes a boom which is provided on an upper swing body of a wheel type crane (not shown) so as to be able to rise and fall, and a tip portion of the boom 1 ( Hereinafter, an auxiliary sheave bracket (hereinafter, simply referred to as sheave bracket) 3 is attached to a boom head 2, and an auxiliary sheave 4 provided on the sheave bracket 3 and an auxiliary sheave 4 drawn out from a winch (not shown) are passed through the auxiliary sheave 4. The auxiliary hook 6 is suspended by the auxiliary winding rope 5 thus formed.

Reference numeral 7 designates an idler sheave for main winding provided in an upper portion of the boom head 2 (upper portion in a horizontal state of the boom, the same in the directionality of the boom 1 hereinafter), and 8 a main winding provided in the lower portion thereof. Main sheave, 9 is a main winding rope passed through both sheaves 7, 8 and 10 is a main winding rope 9
The main hook 10 is suspended from the boom head 2 by means of a main hook storage fitting 12 which is attached to the lower portion of the boom head so as to be rotatable around a horizontal axis 11. Is stored.

The base end of the sheave bracket 3 is attached to the lower part of the front end of the boom head 2 by a horizontal shaft 13 in the left-right direction, and the sheave bracket 3 projects forward of the boom head 2 around the horizontal shaft 13 as shown in FIG. Between the overhang position at the time of working and the retracted position (running position) along the front surface of the boom head in a standing state in which a part of the auxiliary sheave 4 and the sheave bracket 3 are fitted into the boom head 2 as shown in FIG. It can rotate between them.

The bracket 3 has a first downward contact surface 14 and a rearward second contact surface 14 on the lower side (the lower side in the projecting state of FIG. 1, the same in the directionality of the bracket 3 described below).
The contact surface 15 is provided, and the pressing member 16 that constitutes the moment generating means is provided on the upper side.

As shown in FIG. 5, the pressing member 16 has a bifurcated rope engaging portion 16a at its upper end, and has a storage end period (between the position immediately before storage in FIG. 3 and the storage position in FIG. 4).
Then, the rope engaging portion 16a engages with the main winding rope 9 in the boom head 2.

A storage stopper 17 is provided at an intermediate portion in the front-rear direction of the bracket 3 so as to project laterally, and a guide roller 18 for the auxiliary winding rope 5 is provided at a front end portion.

Further, the bracket 3 is provided with a bulging stopper 19 in the rearward direction. In the bulged state, the tip of the bulging stopper 19 abuts on a stopper receiver 20 provided on the front surface of the boom head 2 so that the bracket 3 is secured. It is held in the overhang position.

The sheave bracket 3 has a turning moment M1 due to the weight W of the bracket and a turning moment M2 due to the tension T of the auxiliary winding rope 5 throughout the entire section between the extended position in FIG. 1 and the retracted position in FIG. And work.

Here, M1 = W × a M2 = F1 × b (a: distance from bracket rotation center to bracket center of gravity, F1: force acting on bracket 3 by rope tension T, b: action of this force F1 (Distance between the line and the center of rotation of the bracket) In this auxiliary hook storage device, both rotation moments M1 and M2 in the boom fall (horizontal) state.
The relationship is set as follows.

In the projecting state of FIG. 1, both moments M
Both 1 and M2 act in the overhang direction.

The moment M2 acts in the storage direction from the middle of the initial section toward the storage position (section from the overhang position in FIG. 1 to the position shown by the solid line in FIG. 2), and M1> M2 in the same section. .

In the section after the initial section, this is reversed and M1 <M2.

In other words, various conditions (bracket rotation center position, bracket center of gravity position, auxiliary sheave center, etc.) that determine both moments M1 and M2 are set so that such changes in moment can be obtained. There is.

The operation will be described on the premise of this configuration.
When retracting the auxiliary hook 6 from the working state of FIG. 1, (a) wind up the auxiliary hook 6 to move the first sheave bracket 3 to the first position.
The bracket 3 is brought into contact with the contact surface 14, and the bracket 3 is rotated in the storage direction (upward) as shown by an imaginary line in FIG.

(B) When the sheave bracket 3 exceeds the initial storage section in this state, M1 <M2 as described above, so that the bracket 3 automatically rotates in the storage direction regardless of the auxiliary hook winding force.

(C) Thus, the sheave bracket 3 is shown in FIG.
When it reaches the position immediately before the storage, the rope engaging portion 16a of the pressing member 16 is pressed against the main winding rope 9 in the boom head 2.

As a result, the automatic rotation of the sheave bracket 3 is stopped, and the collision between the storage stopper 17 of the bracket 3 and the boom head front surface is prevented.

In this state, the reaction force F of the main winding rope 9
2, a moment M3 (= F2 × c) in the overhanging direction acts on the sheave bracket 3, and this moment M3 opposes the stored moment.

On the other hand, at the position immediately before the storage, the second contact surface 15 of the sheave bracket 3 faces downward and faces the auxiliary hook 6.

(D) When the auxiliary hook 6 is further wound up from here, the auxiliary hook 6 comes into contact with the second contact surface 15, and the sheave bracket 3 is pressed by the pressing member 16 by the auxiliary hook hoisting force. Is pushed into the boom head and rotated in the storing direction, and the storing is completed when the storing stopper 17 comes into contact with the front surface of the boom head.

In this way, the auxiliary hook 6 is attached to the boom head 2
Since the auxiliary hook 6 is stored on the front surface, the ground height in the retracted state of the auxiliary hook 6 becomes high. Therefore, it is possible to increase the approach angle and the departure angle during traveling of the crane.

Further, in comparison with the method using the storage metal fittings,
Since the metal fittings are no longer needed (the amount of metal fittings hanging), the lift during crane work can be increased.

On the other hand, when the auxiliary hook 6 is extended, the auxiliary hook 6 is unwound from the retracted state shown in FIG.

In this way, the tension T of the auxiliary winding rope 5 becomes 0, and the moment M2 due to the rope tension disappears, so that the sheave bracket 3 is bulged by the moment M3 due to the reaction force of the main winding rope and the moment M1 due to the weight of the bracket itself. Then, the overhanging stopper 19 comes into contact with the stopper receiver 20 to complete the overhang.

Second Embodiment (Refer to FIG. 6) Only differences from the first embodiment will be described.

While the pressing member 16 and the main winding rope 9 are used as the moment generating means in the first embodiment,
In the second embodiment, the torsion spring 21 is provided at the rotation fulcrum portion of the sheave bracket 3 (the pivotal attachment portion of the sheave bracket 3 to the boom head 2).

The torsion spring 21 is in a free state when the sheave bracket 3 is extended, and in this state, one end is locked to the boom head 2 and the other end is apart from the sheave bracket 3.

Then, as shown by the phantom line in FIG. 6, the spring 21 exerts a spring force between the sheave bracket 3 and the boom head 2 from the time when the sheave bracket 3 reaches the position immediately before storage to the storage position. However, this spring force exerts a cushioning action when stored and a bracket pushing action when the auxiliary hook is extended.

[0053]

As described above, according to the present invention, the auxiliary sheave bracket is rotatably attached to the boom head between the extended position projecting forward of the boom head and the retracted position along the front surface of the boom head. The auxiliary sheave bracket is stored on the front surface of the boom tip through a section where it is rotated by the hoisting force of the auxiliary hook and a section where it is automatically rotated by the rotation moment due to rope tension. Since it is configured to be wound and stored, it is possible to increase the ground height of the auxiliary hook in the stored state and increase the approach angle and the departure angle during traveling of the crane.

Further, as compared with the case where the auxiliary hook storage metal fitting is used, the lifting height loss due to the hanging of the metal fitting is eliminated during the crane work, and therefore the lifting height can be increased. , A moment generating means (main winding rope and pressing member in the invention of claim 3 and a spring in the invention of claim 4) in the final storage section of the auxiliary sheave bracket.
As a result, a moment in the overhanging direction acts, and this acts as a storage brake to mitigate the impact during storage. Furthermore, the moment of the moment generating means ensures the extension operation of the auxiliary sheave bracket.

[Brief description of drawings]

FIG. 1 is a side view showing an extended state of an auxiliary sheave bracket according to a first embodiment of the present invention.

FIG. 2 is a side view of the bracket during storage.

FIG. 3 is a side view of the bracket immediately before storage.

FIG. 4 is a side view of the bracket in a retracted state.

5 is an enlarged cross-sectional view taken along line VV of FIG.

FIG. 6 is a side view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Boom 2 Boom Head (Boom Tip) 3 Auxiliary Sheave Bracket 4 Auxiliary Sheave 5 Auxiliary Rope 6 Auxiliary Hook 13 Horizontal Axis as Rotation Center of Auxiliary Sheave Bracket 14 First Abutment Surface of Same Bracket 15 Same Second Contact surface 16 Pressing member constituting moment generating means 9 Main winding rope 19 Overhanging stopper 20 Stopper receiver 21 Torsion spring as moment generating means

Claims (4)

[Claims] 1. A supplementary hook storage device for a wheel-type crane, comprising the following configuration. (I) An auxiliary sheave bracket with an auxiliary sheave through which the auxiliary winding rope passes is attached to the boom tip, and the auxiliary sheave bracket has a retracted position along the front of the boom tip when the boom is lying down, with the horizontal horizontal axis as the center. It must be attached so that it can rotate between it and the projecting position that projects toward the front of the tip. (II) The auxiliary sheave bracket shall be configured so that the turning moment due to the weight of the bracket and the turning moment due to the tension of the auxiliary winding rope act. (III) The sum of the above turning moments when the boom is lying down,
The conditions for determining both moments are set so that the auxiliary sheave bracket works in the extension direction in the initial storage section from the extension position to the storage position and in the storage direction in the other sections, in the storage direction. (IV) The auxiliary sheave bracket is provided with a first contact surface with which the auxiliary hook can abut in the initial storage section and a second contact surface with which the auxiliary hook can abut in the final storage section. (V) An extension stopper that holds the auxiliary sheave bracket in the extension position must be provided. 2. The supplementary hook storage device for a wheel crane according to claim 1, further comprising a moment generating means for generating a moment against the storage moment in the final storage period of the auxiliary sheave bracket. Auxiliary hook storage device for wheel type cranes. 3. The auxiliary hook storage device for a wheeled crane according to claim 2, wherein the moment generating means is passed through the main winding sheave in the boom tip portion to suspend the main hook, and the storage end period. A supplementary hook storage device for a wheel crane, comprising a pressing member provided on an auxiliary sheave bracket so as to be pressed against the main winding rope in a section. 4. The auxiliary hook storage device for a wheel type crane according to claim 2, wherein the moment generating means is:
A supplementary hook storage device for a wheeled crane, wherein a spring is provided between the auxiliary sheave bracket and the boom tip.