JPH08208187A - Hook storage device of wheel crane - Google Patents

Abstract

PURPOSE: To set a hook easily in a proper storage state with moderate rope tension. CONSTITUTION: An elastic body 15 equipped with a coil spring is installed in a main hook storage fitting 11 being adjacently opposed to a sub hook 9 in a state of storing this hook 9, and a superfluous interval, where rope tension is gradually increased to a rope winding amount, is made so as to be formed by an elastic deformation action of this elastic body 15.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a hook storage device, Japanese Patent Laid-Open Publication No.
As shown in No. 341496, a hook storage metal fitting is provided at the tip of the boom in front of the line of hoisting of the hook (the front in the boom fall state, the same in the front-back and up-down directions described below). By pivotally pivoting around a displaced horizontal axis and winding the hook up (up to maximum), the hook retracting force causes the hook storage bracket to rotate upward, and the hook with the bracket facing backwards. It is known that the boom is stored on the lower surface side of the boom tip in a recumbent posture.

According to this device, the hook can be automatically retracted and released only by the winding and lowering operations of the hook, so that the hook can be retracted as compared with the case where the hook is moored and fixed to the undercarriage with a rope. -Releasing operation becomes easy.

[0004]

However, according to the conventional device adopting the hook winding and storing method, the following problems occur when the hook is stored.

That is, the hook stops at the retracted position by contacting the stopper provided on the boom side, but if the timing of this stop is late, the rope tension will suddenly increase from the time of the stopper action and the winch drum will move. The rope will be caught and the rope will be damaged.

On the other hand, if the stopping timing is early, the winding force (rope tension) will be insufficient and the hook will not be sufficiently fixed in the retracted position, and it will vibrate violently during running and interfere with other structures.

Particularly, in the case of the auxiliary hook on which one auxiliary rope is hung, it is difficult to take this timing because the ascending / descending speed is high.

At this point, the operator must carefully perform the hook storing operation over time,
This operation is very troublesome, and there is a problem that it is difficult to obtain an appropriate stored state with an appropriate rope tension.

Therefore, the present invention is to provide a jib storage device for a wheeled crane in which the hook can be easily set in an appropriate storage state.

[0010]

According to a first aspect of the present invention, a hook storing metal fitting is provided at a tip portion of a boom about a horizontal horizontal axis which is displaced forward with respect to a line of force for hook hopping in a boom laid state. The hook storage unit, which is movably pivoted, rotates the hook storage unit consisting of the hook and the hook storage fitting from the working position in which the hook is suspended by its own weight to the storage position in which the hook faces the base end side of the boom. In a hook storage device for a wheeled crane configured, one of the above-described hook storage unit and a member that closely faces the hook storage unit at the storage position,
An elastic body that elastically contacts the other at the storage position to restrict the rotation of the hook storage unit is provided.

According to the second aspect of the present invention, the auxiliary hook storage metal fitting and the main hook storage metal fitting are displaced from each other in the front and rear direction at the tip of the boom, and the auxiliary hook storage metal fitting is arranged with respect to the auxiliary hook hoisting force line. The main hook storage bracket is pivotally attached to the main hook hoisting force line so as to be rotatable about the horizontal horizontal axis that is displaced forward in the boom collapse state.
The auxiliary hook storage unit consisting of an auxiliary hook suspended by an auxiliary winding rope and the auxiliary hook storage fitting, and the main hook suspension unit consisting of a main hook suspended by the main winding rope and the main hook storage fitting are hooked respectively. A hook storage device for a wheeled crane, configured to rotate from a working position in which the hook hangs down by its own weight to a storage position in which the hook faces the boom base end side by a winding force. When,
One of the main hook storage metal fittings of the main hook storage unit, which closely faces the auxiliary hook storage unit at the storage position, elastically contacts the other of the main hook storage metal fittings at the storage position to restrict the rotation of the auxiliary hook storage unit. The elastic body is provided.

According to a third aspect of the present invention, in the structure of the second aspect, the elastic body is provided on the main hook storage fitting.

According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, the elastic body includes a coil spring and a shaft body that transmits a contact pressure to the coil spring.

According to a fifth aspect of the present invention, in the structure according to any one of the first to third aspects, the elastic body is made of a vibration-proof rubber.

According to a sixth aspect of the present invention, in any one of the first to third aspects, the elastic body includes a cylinder, a first piston provided in the cylinder so as to be movable in the axial direction, and the first piston. A piston rod connected to the piston,
A second piston provided on the head side of the first piston in the cylinder, oil filled in oil chambers on both sides of the first piston, and a gas chamber between the second piston and the cylinder head. The high pressure gas is filled with an orifice provided in the first piston in a state where the oil chambers on both sides communicate with each other.

[0016]

According to the above construction, the hook storing unit (the auxiliary hook storing unit in claims 2 and 3) and the other member (the main hook storing metal fitting of the main hook storing unit in claims 2 and 3) are interposed via the elastic body. Since they come into contact with each other and exert a stopper action, the rope tension gradually increases in the elastic deformation section of this elastic body.

That is, a margin section is created in which the change in rope tension is insensitive to the rope winding amount, and it is sufficient to set the storage stop timing in this margin section, so that the hook storing operation (rope winding operation) is performed. Easier to do.

Moreover, in this margin area, since the change in the rope tension with respect to the rope winding amount is small, it is easy to obtain an appropriate rope tension.

As a result, the hook can be easily set in an appropriate stored state with an appropriate rope tension.

Further, since the vibration of the hook storage unit during traveling is absorbed by the cushioning action of the elastic body, it is possible to prevent the unit from being damaged and the rope from being caught in the winch drum due to the shock of the vibration.

According to the third aspect of the present invention, since the elastic body is provided in the main hook storage fitting, the elastic body interferes with slinging work as in the case where it is provided in the auxiliary hook, or the crane is used. There is no danger of getting caught in other objects during work.

According to the structure of claim 4 in which the coil spring and the shaft form an elastic body and the structure of claim 5 in which the elastic body is composed of a vibration-proof rubber, the structure is simple and the cost is low. .

In addition, according to the structure of claim 5, mechanical wear of the elastic body and the members in contact with the elastic body can be reduced.

On the other hand, according to the construction of claim 6 in which the elastic body is constituted by a so-called gas spring, a high vibration damping effect is obtained in addition to the original elastic stopper action, and a vibration preventing action of the hook storing unit during traveling is obtained. It will be excellent.

[0025]

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

First Embodiment (See FIGS. 1 to 4) In FIG. 1, L is a lower traveling body of a crane, and an upper revolving structure (not shown) is mounted on the lower traveling structure L, and a boom is mounted on the upper revolving structure. 1 is mounted so that it can be undulated.

The boom 1 is composed of a basic boom 1a and a plurality of movable booms 1b, which are extendable and retractable, and a main hook 2 mainly used for low-speed hanging work of heavy objects.
Is hung by the main winding rope 3 from the tip (boom head) 1c of the boom 1.

The main hoisting rope 3 is pulled out from a winch (not shown), passed through a boom point idler sheave 4, and then wound around a boom point main sheave 5 and a hook sheave 6.

An auxiliary sheave bracket 8 provided with an auxiliary sheave 7 is attached to the front side of the boom head 1c so as to project forward, and an auxiliary hook 9 for a single rope used for high-speed lifting work of a lightweight object is additionally wound. The rope 10 is suspended from the auxiliary sheave bracket 8.

The auxiliary winding rope 10 is pulled out from the winch, and the boom point idler sheave 4 and the auxiliary sheave 7 are pulled out.
And the terminal is fastened to the auxiliary hook 9.

On the other hand, a main hook storage fitting 11 is provided at the lower end of the boom head 1c on the front side, and an auxiliary hook storage fitting 12 is provided at the tip of the auxiliary sheave bracket 8 so as to be rotatable around horizontal support shafts 13 and 14, respectively. Installed on.

The lower surfaces of the bottom plates 11a and 12a of the two metal fittings 11 and 12 serve as contact surfaces with respect to the hook upper surfaces. It is applied as a pushing-up force to both the storage fittings 11 and 12 via the abutting portion.

The support shafts 13 and 14, which are the centers of rotation of the two storage fittings 11 and 12, are the winding force lines of the hooks 2 and 9, that is, the boom point main sheave for the main hook 2 as shown in FIG. 5 and a line X1 connecting the center of each sheave axis of the hook sheave 6, and for the auxiliary hook 9, the center line X of the auxiliary winding rope 10 between the hook 9 and the auxiliary sheave 7.
It is provided at a position shifted forward with respect to each other.

As a result, the hoisting force of the main hook 2 causes the main hook storage unit U1 including the main hook 2 and the main hook storage fitting 11 to be wound.
However, due to the hoisting force of the auxiliary hook 9, the auxiliary hook storage unit U2 including the auxiliary hook 9 and the auxiliary hook storage metal member 12 hangs from the boom head 1c and the auxiliary sheave bracket 8 by its own weight around the support shafts 13 and 14, respectively. As shown in FIG. 1, it is configured so as to be capable of pivoting upward from the working position to a retracted position in a rearward lying posture along a lower surface side of the boom head 1c to a storage position.

Therefore, at the time of traveling, the hooks 2 and 9 can be automatically retracted by winding them and fixed by rope tension. Further, during crane work, by loosening both hooks 2 and 9 (winding the hooks 2 and 9 down), both storage units U1 and U2 can be hung down to immediately enter a working state.

Here, in the present device, the auxiliary hook 9
The following measures are taken to facilitate the storage operation of the (supplementary hook storage unit U2).

As shown in FIGS. 1 and 2, the auxiliary hook 9 is in a state of being closely opposed to the back plate 11b of the main hook storage fitting 11 in the stored state.

Therefore, as shown in FIG. 2, this metal fitting back plate 1
1b is provided with an elastic body 15 as a stopper that elastically contacts the auxiliary hook 9 when both hooks are stored and restricts the rotation of the auxiliary hook 9.

As shown in FIG. 2, the elastic body 15 includes a coil spring 16 and a headed rod 17 for transmitting the spring force of the coil spring 16 to the auxiliary hook 9.

The rod 17 is inserted into the hole 18 and the guide cylinder 19 provided in the metal fitting back plate 11b, with the head portion 17a protruding toward the auxiliary hook side as a contact portion for the auxiliary hook 9, and the insertion single portion thereof is inserted. Screwed nuts 20,20
It has been prevented from falling out.

Thus, the auxiliary hook 9 is stored at the auxiliary hook storage position.
The outer peripheral surface of the rod comes into contact with the rod head 17a, and this contact pressure,
That is, the auxiliary hook winding force is transmitted to the coil spring 16 and the spring 16 is compressed.

According to this structure, as shown in FIG. 3, the stopper action starting point S at which the elastic body 15 contacts the auxiliary hook 9 is reached.
The rope tension gradually increases in the elastic deformation section S of the elastic body 15 from 1 to the compression deformation end point S2 of the coil spring 16, and thereafter the spring action is lost and the rope tension sharply increases.

That is, the elastic deformation section S is a margin section in which the change in rope tension is insensitive to the rope winding amount, and the storage stop timing may be set in this margin section. Winding operation of the winding rope 10)
It becomes easy to peel off.

Moreover, in the elastic deformation section, since the amount of change in the rope tension with respect to the rope winding amount is small, it is easy to obtain an appropriate rope tension state.

Thus, the auxiliary hook 9 (auxiliary hook storage unit U2) can be easily set in an appropriate storage state with an appropriate rope tension.

Further, due to the buffering action of the coil spring 16,
Since the vibration of the auxiliary hook storage unit U2 during traveling is absorbed, it is possible to prevent the damage of the unit U2 due to the shock of vibration and the jamming of the rope on the winch drum.

Second Embodiment (Refer to FIGS. 5 and 6) Explaining only the differences from the first embodiment, in the second embodiment, the vibration-proof rubber 21 formed in a truncated cone shape (or a truncated pyramid shape) is used. The elastic body 15 is configured by being attached to the metal fitting back plate 11b with bolts 22 and nuts 23 in a state of protruding toward the auxiliary hook side.

According to this structure, as in the first embodiment,
The elastic deformation section S of the anti-vibration rubber 21 becomes a marginal section, which facilitates the storage operation of the auxiliary hooks. In addition, the non-linear spring characteristic of the anti-vibration rubber 21 as shown in FIG. On the other hand, a linear change is shown instead of a straight line.

That is, since the change in the rope tension after coming into contact with the elastic body 15 is small at first and gradually increases, the auxiliary hook retracting operation is further performed especially in the crane in which the operation reaction force is transmitted to the operator as a response. It will be easy.

Further, as in the first embodiment, metal (rod 1
7) Compared with the case where the metal and the metal (metal fitting back plate 11b) are in contact with each other, the rubber (anti-vibration rubber 21) and the metal (metal fitting back plate 11b)
Since they contact each other, less wear is required on both sides.

Further, the vibration-proof rubber 21 is made up of the coil spring 16
Compared with the above, since the vibration damping effect is large, the effect of suppressing the vibration of the auxiliary hook storage unit U2 during traveling is high.

Third Embodiment (see FIG. 7) In the third embodiment, the elastic body 15 is constituted by a so-called gas spring.

More specifically, the cylinder 2 is attached to the metal fitting back plate 11b.
4 is mounted in the cylinder 24 and the first and second
The pistons 25 and 26 are inserted at intervals in the cylinder axial direction, and the piston rod 27 connected to the first piston 25 projects toward the auxiliary hook 9 side as a contact portion for the auxiliary hook 9.

In the cylinder 24, first and second oil chambers A1 and A2 are formed on both sides of the first piston 25, and both oil chambers A1 and A2 are filled with oil and both oil chambers A are filled.
1 and A2 are communicated with each other by an orifice 28 provided in the piston 25.

A gas chamber B is formed on the cylinder head side of the second piston 26, and the second oil chamber A is formed in the gas chamber B.
It is filled with high-pressure gas as a gas spring that pressurizes the oil in 2.

According to this structure, the same elastic deformation section as in the first and second embodiments is formed by the action of oil flow between the oil chambers A1 and A2 by the orifice 28.

Further, the gas spring action of the high-pressure gas in the gas chamber B has a shock absorber action that damps the vibration of the auxiliary hook 9 during traveling, which is stronger than the vibration isolating rubber 21 of the second embodiment, and the auxiliary hook. The vibration prevention effect of the storage unit U2 is further enhanced.

By the way, in the above embodiment, the elastic body 15 is attached to the main hook storage fitting 11, but it may be attached to the auxiliary hook 9 conversely.

On the other hand, in the main hook storing unit U1, since the main winding rope 3 is usually hung around the boom point main sheave 5 and the hook sheave 6 more than two times, it is compared with the single hook auxiliary hook 9. Since the ascending / descending speed is remarkably slow, the necessity of providing the elastic deformation section is low.

Therefore, in the above embodiment, the present invention is applied only to the auxiliary hook storage unit U2, but it goes without saying that the present invention can also be applied to the main hook storage unit U1 (particularly the main winding rope 3). It is desirable to apply it in the case of the two-barrel system that can be hung only once.

Further, as the elastic body 15, instead of the elastic body 15 showing the linear characteristic and the non-linear characteristic shown in the above-mentioned embodiment, it is possible to use one having a broken line spring characteristic.

[0062]

As described above, according to the present invention, the hook storage unit (the auxiliary hook storage unit in claims 2 and 3) and the member that closely faces the unit at the storage position (claims 2 and 3). Then, one side of the main hook storage bracket of the main hook storage unit) is provided with an elastic body that elastically comes into contact with the other at the storage position and exerts a stopper action. On the other hand, an allowance section is created where the rope tension gradually increases. Therefore, since it is only necessary to set the storage stop timing in this margin section, the hook storage operation (rope winding operation) is facilitated.

Moreover, in this margin area, since the change in the rope tension with respect to the rope winding amount is small, it is easy to obtain an appropriate rope tension.

As a result, the hook can be easily set in an appropriate stored state with an appropriate rope tension.

Further, since the vibration of the hook storing unit during traveling is absorbed by the cushioning action of the elastic body, it is possible to prevent the unit from being damaged and the rope from being caught in the winch drum due to the shock of the vibration.

According to the third aspect of the present invention, since the elastic body is provided in the main hook storage fitting, the elastic body interferes with the slinging work as in the case where the elastic body is provided in the auxiliary hook, and the crane is used. There is no danger of getting caught in other objects during work.

According to the invention of claim 4 in which the coil spring and the shaft form an elastic body, and the invention in claim 5 in which the elastic body is composed of a vibration-proof rubber, the structure is simple and the cost is low. .

In addition, according to the fifth aspect of the invention, the mechanical wear of the elastic body and the members in contact therewith can be reduced.

On the other hand, according to the invention of claim 6 in which the elastic body is constituted by a so-called gas spring, a high vibration damping effect can be obtained in addition to the original elastic stopper function, and a function for preventing vibration of the hook storing unit during traveling can be obtained. It will be excellent.

[Brief description of drawings]

FIG. 1 is a side view of a hook retracted state showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway enlarged view of FIG.

FIG. 3 is a diagram showing a change characteristic of rope tension with respect to a winding amount of the auxiliary winding rope according to the embodiment.

FIG. 4 is a side view of the embodiment before storing the hook.

FIG. 5 is a view, corresponding to FIG. 2, showing a second embodiment of the present invention.

FIG. 6 is a diagram showing a change characteristic of rope tension with respect to a rope winding amount according to the embodiment.

FIG. 7 is a view, corresponding to FIG. 2, showing a third embodiment of the present invention.

[Explanation of symbols]

1 Boom 1c Boom head U1 Main hook storage unit 2 Main hook 3 Main winding rope 11 Main hook storage bracket 13 Spindle that serves as a pivot for the main hook storage bracket U2 Supplementary hook storage unit 9 Supplementary hook 12 Supplementary hook storage bracket 14 Supplementary A support shaft that serves as a fulcrum of rotation of the hook storage fitting 15 Elastic body 16 Coil spring that constitutes an elastic body 17 Same rod (shaft body) 21 Anti-vibration rubber that constitutes an elastic body 22 Same bolt 23 Same nut 24 Gas spring as elastic body Cylinder 25 First piston 26 Second piston 27 Piston rod 28 Orifice A1, A2 Oil chamber B Gas chamber

Claims (6)

[Claims] 1. A hook storage metal fitting is pivotally attached to a front end portion of a boom so as to be rotatable about a horizontal horizontal axis which is displaced forward with respect to the line of hoisting force of the boom and is tilted forward in a state of collapse of the boom. In a hook storage device for a wheel-type crane configured to rotate a hook storage unit including a hook and the hook storage fitting from a working position that hangs down by its own weight to a storage position where the hook faces the boom base end side. An elastic body that elastically contacts the other at the storage position and restricts rotation of the hook storage unit, on one side of the hook storage unit and a member that closely faces the hook storage unit at the storage position. A hook storage device for a wheeled crane characterized by being provided. 2. The auxiliary hook storage metal fitting and the main hook storage metal fitting are displaced from each other at the front and rear of the boom, and the auxiliary hook storage metal fitting is attached to the auxiliary hook hoisting force line and the main hook storage metal fitting is attached. Are auxiliary hooks that are pivotally attached to the main hook hoisting force lines so as to be rotatable around horizontal horizontal axes that are displaced to the front in the boom collapse state, and are hung by auxiliary winding ropes, and the auxiliary hook storage metal fittings. The auxiliary hook storage unit consisting of, the main hook that is suspended by the main winding rope, and the main hook storage unit that consists of the main hook storage metal fittings are
A hook storage device for a wheel-type crane configured to rotate from a working position in which the hook hangs down by its own weight to a storage position in which the hook faces the base end side of the boom. An elastic body for elastically contacting one of the main hook storage fittings of the main hook storage unit, which is closely opposed to the storage unit at the storage position, to the other at the storage position to restrict rotation of the auxiliary hook storage unit. A hook storage device for a wheeled crane, wherein the hook storage device is provided. 3. The hook storage device for a wheeled crane according to claim 2, wherein an elastic body is provided on the main hook storage fitting. 4. The hook retractor for a wheeled crane according to claim 1, wherein the elastic body is composed of a coil spring and a shaft for transmitting a contact pressure to the coil spring. 5. The hook retractor for a wheeled crane according to claim 1, wherein the elastic body is made of vibration-proof rubber. 6. An elastic body comprising a cylinder, a first piston axially movable in the cylinder, a piston rod connected to the first piston, and the first piston in the cylinder. The second piston provided on the head side, the oil filled in the oil chambers on both sides of the first piston, the high pressure gas filled in the gas chamber between the second piston and the cylinder head, The hook retractor for a wheel crane according to any one of claims 1 to 3, wherein the hook retractor is configured by an orifice provided in the first piston in a state where the oil chambers on both sides are communicated with each other.