JP2801840B2 - Wheel crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel crane provided with a cabin (operating cab) on an upper revolving structure that is used for both crane work and running.

[0002]

2. Description of the Related Art The general structure of a conventional wheel crane will be described with reference to FIG.

A is a lower traveling body, B is an upper revolving superstructure, and the upper revolving superstructure B has a revolving frame 1.
A cabin 2 that is used for both crane work and running is installed on one of the left and right sides of the vehicle 1 (usually, on the right side as shown in the figure, hereinafter, described in this example).

[0004] A winch box 3 is provided at the rear of the revolving frame 1, and the winch box 3 is provided.
The main winding winch W1 for winding and driving the main winding rope R1 and the auxiliary winding winch W2 for winding and driving the auxiliary winding rope R2 are accommodated in front and rear arrangement. Reference numeral 4 denotes a counterweight attached to the rear surface of the winch box 3.

[0005] A boom 5 is pivotally attached to the swiveling frame 1 so as to be able to move up and down.

The boom 5 has a boom foot 5a on a lower surface side of the base end in a boom-down state, and the boom foot 5a is pivotally attached to an upper end of the revolving frame 1 by a boom foot pin 6. When the vehicle is traveling on a crane, the vehicle is in a horizontal lying state (hereinafter referred to as a maximum lying state) as shown. Reference numeral 7 denotes a boom raising and lowering cylinder for raising and lowering the boom 5.

At the base end of the boom 5, a gantry 8 having two gantry sheaves 8a and 8b is provided.
The main winding and auxiliary winding ropes R1 and R2 drawn from the winches W1 and W2 are passed through the gantry sheaves 8a and 8b to form a point idler S1 and S at the end of the boom.
Guided towards 2. S3 and S4 are point main sheaves at the tip of the boom.

According to this conventional wheel crane, when the boom is in the maximum lying state, the boom 5 is located at the upper left side of the cabin 2 as shown in FIG. Eye point P which is the standard viewpoint position in the direction
(The definition of the eye point is shown on page 68 of the new vehicle inspection-related standards collection, supervised by the Vehicle Inspection Division of the Road Safety Division of the Ministry of Transport, the Land Safety Division, and the Vehicle Inspection Division of the Institute of Road Safety and Pollution, Ministry of Transport) There is a problem in that the lateral visibility deteriorates because the vehicle crosses the position.

As a means for solving this problem, as shown in FIG. 3, a boom foot 9a is provided on the upper surface side of the base end of the boom, and the boom foot 9a is turned by the boom foot pin 9. By pivoting on the arm 1, the boom 5 is lowered at a low position when traveling, that is, at a position below the eye point P to improve the left field of view during traveling. 63-3
Nos. 7097 and 766928).

[0010]

However, this configuration still has the following problems.

(I) When the boom 5 is moved downward from the layout of FIG. 2, the winches W1 and W2 interfere with the base end of the boom.

Therefore, in the crane shown in FIG. 3, the winches W1 and W2 are installed on the upper surface of the boom 5 in the falling state.

In this case, the winches W1 and W2 need to be installed behind the eye point P in the boom-down state, that is, at the base end side of the boom in order to improve the visibility during running.

However, in this case, when the boom 5 is erected, when the erection angle is increased, the winch W
1 and W2 protrude rearward from the turning rear end of the upper swing body B (the rear surface of the counterweight 4), and the rear turning radius of the upper swing body B increases.

This increase in the rear end turning radius is practically acceptable in a small range, but when it exceeds a permissible range,
The narrow workability, which is an important function for wheel cranes, will be reduced.

In order to avoid such a situation, the maximum upright angle of the boom 5 is limited to an angle at which the winches W1 and W2 do not project beyond the turning rear end (the winch projecting amount becomes 0 or a value close thereto). The lifting lift, which is more important for the crane, is then reduced.

Therefore, the winch W1 and the winch W1 can be used without deteriorating the two important crane performances of workability in a narrow place and head.
In order to install W2 on the upper surface of the boom, the space for installing the winch, particularly its front-back dimension, must be kept small.

Moreover, since the upper surface of the boom is used, the width that can be used as a space for installing the winch can be reduced. Therefore, it is difficult to arrange the winches W1 and W2 side by side. It protrudes greatly and causes various problems.

For this reason, in the wheel crane shown in FIG.
Either the winches W1 and W2 can be used only with small rope winding capacity or the winches W1 and W2
2 becomes difficult to install.

(Ii) Normally, the winches W1 and W2 are driven by a hydraulic motor, and a hydraulic pump (both not shown) serving as a hydraulic oil supply source for the hydraulic motor is installed on the lower traveling body, and oil from the pump is provided. Is supplied to the hydraulic motor via a swivel joint provided at the center of rotation and a pipe connected to the swivel joint.

In this case, the distance between the hydraulic motor provided on the top surface of the boom and the swivel joint changes due to the ups and downs of the boom. A hose reel must be provided on the swivel frame 1 between the swivel joint.

For this reason, not only is the equipment cost high, but also a space for installing the hose reel (around the rear end of the turning frame when viewed at the actual machine level) must be secured in the turning frame 1.

Accordingly, the present invention provides a wheel crane which can secure a sufficient winch installation space without lowering the crane performance (workability in narrow places, head height) by the winch while improving the visibility during running. Is provided.

[0024]

SUMMARY OF THE INVENTION The present invention relates to a wheel crane in which a boom is provided on a swing frame of an upper swing body provided with a cabin which is commonly used for crane operation and traveling. ) By setting the fulcrum of the boom at a height near the eye point in the cabin, a winch installation space is formed below the base end of the boom, and (B) a main drive for winding and driving the hoisting rope. The winch and the auxiliary winch are provided on the revolving frame in the winch space so as to be coaxial with each other and do not protrude rearward of the revolving rear end, and (C) the boom has a tip end portion larger than a base end portion. It is provided in such a state that it has a lower and lower inclined posture and crosses the side surface of the cabin below the eye point.

[0025]

According to this configuration, (I) installation of a winch: a) determining the installation position of a winch (a hydraulic motor for driving a winch) on a revolving frame; Is omitted to secure a space for installing the hose reel below the boom base end of the turning frame. B) Set the boom fulcrum at a high position near the eye point in the cabin and raise the boom base position. By expanding the space for installing the hose reel, a sufficient space for installing the winch below the base end of the boom in the swivel frame is secured, and the winch with the necessary and sufficient winding capacity is provided here. Does not protrude backward beyond the rear end of the upper revolving structure (ensures workability in narrow places)
It can be easily installed in the state.

Further, by providing both the main winding and the auxiliary winding in the left and right coaxial arrangement, the winch can be made compact in the front-rear direction, so that the required winch capacity is secured more and more, and It is easy not to protrude backward.

(II) With respect to the field of view during running, the boom, which is set at a position where the fulcrum is high as described above, is inclined forward and downward in the lying state, so that the boom crosses the side of the cabin below the eye point. It is possible to secure the side view by the arrangement.

Further, the boom rising angle is not limited by the winch (the head is secured).

That is, it is possible to easily install a winch having a sufficient winding capacity without deteriorating the field of view during traveling and important crane performance (workability in a narrow place, lift) by the winch.

Further, by installing the winch, which is a heavy object, at the rear end of the revolving frame, the winch serves as a counterweight, so that the lifting capacity can be increased.

[0031]

FIG. 1 shows an embodiment of the present invention.

In the drawing, C is a lower traveling structure, D is an upper revolving structure, 11 is a revolving frame of the upper revolving structure D, 12 is a cabin provided on the revolving frame 11, and 13 is a revolving frame. A boom pivotally attached to the boom 11 so as to be able to move up and down is a boom up / down cylinder.

In this crane, the turning frame 1
The rear end of the revolving frame 11 is provided at the rear end of the revolving frame D, that is, at the rear end of the revolving frame D, that is, the rear end of the revolving frame D is not provided at the rear end of the conventional crane shown in FIGS. The rear end is configured.

On the other hand, the boom 13 has a boom base end 13a.
The upper end of the cabin 1 is pivotally connected to the revolving frame 11 by the boom foot pin 15, and the cabin 1
2 so as to cross the left side surface of the cabin 12 at a position below the eye point P.

Here, the position of the boom fulcrum (boom foot pin 15) is as follows: (a) in the height direction, a position close to the height of the eye point P in the cabin 2; When the boom is raised and lowered, the pivoting portion is set at the rearmost position as far as possible without falling outside the rear end turning radius of the turning frame 11.

By setting the boom undulation fulcrum at a high position near the eye point P as in (a) above,
A winch installation space is secured below the base end of the boom.

In this wheel crane,
In order to set the boom up / down fulcrum at a high position close to the eye point P while satisfying the condition that the boom 13 traverses the side of the cabin below the eye point P in the lying state as described above. And turning frame 11
Is extended longer than the revolving frame 1 of the conventional crane shown in FIGS. 2 and 3, and a boom pivot point is set at the upper end thereof.

As a result, the downward inclination angle of the boom 13 during traveling becomes large, so that the head is increased while the left field of view is secured, or if the head is made the same as the conventional one,
System length can be shortened.

The rear end of the revolving frame 11 is defined as the revolving rear end of the upper revolving superstructure D, and the boom pivot point is set at the maximum rear end position of the revolving frame 11. If the rear end turning radius is set to be the same as that of the conventional wheel crane shown in FIG. 3, the boom pivot point will be located behind the conventional one.

Due to the synergistic effect of this point, the point that the boom length can be shortened, and the point that the boom 13 falls down in a forwardly inclined position during traveling, the front of the boom 13 during traveling is obtained. The protrusion amount X can be made smaller than the boom forward protrusion amount X in the conventional crane shown in FIGS.

Further, since the pivot point of the boom is shifted rearward as compared with the conventional art, the distance from the center of rotation to the pivot point of the boom becomes longer, so that the suspension stability is enhanced. Therefore,
Even if the counterweight is omitted, the same suspending ability as that of the related art can be secured.

On the other hand, the main winding winch W1 for winding and driving the main winding rope R1 and the auxiliary winding winch W2 for winding and driving the auxiliary winding rope R2 are coaxially arranged on the left and right sides. The boom base end (basic boom 13) obtained by setting the boom
(Ii) installed on the revolving frame 11 at a position where it does not protrude rearward of the revolving rear end of the upper revolving structure D (the winch protruding amount is 0 or a value close thereto). .

In this way, as shown in FIG. 3, the winches W1 and W2 project rearward from the turning rear end in the maximum standing state of the boom 5 like a conventional crane in which the winches W1 and W2 are arranged on the upper surface of the boom 5. There is no danger at all.

For this reason, there is no possibility that the crane performance will be degraded due to an increase in the rear end turning radius or a decrease in the maximum boom upright angle.

The ropes R1, R2 drawn from the winches W1, W2 can be directly drawn into the point sheaves 17, 18 at the end of the boom along the bottom surface of the boom.
For this reason, the point idler S at the upper end of the boom required for the conventional wheel crane shown in FIGS.
1, S2 becomes unnecessary.

Therefore, the weight at the tip of the boom can be reduced, so that the lifting capacity can be increased.

By the way, a loop guide roller 16 is provided at a plurality of positions in the length direction on the lower surface of the boom, and the winch W
The ropes R1 and R2 drawn from W1 and W2 are point-sealed along the lower surface of the boom by the rope guide rollers 16.
The guides 17 and 18 are guided.

A boom point idler sheave may be provided at the end of the boom, and both ropes R1 and R2 may be pulled out toward the upper surface of the boom and passed through the boom point idler sheave.

On the other hand, the undercarriage C is provided with outriggers, which are standard equipment of the crane, on both front and rear sides, but are not shown here.

Other Embodiments (1) In the above embodiment, the upper end of the boom base end 13a is pivotally connected to the revolving frame 11, but a bracket is mounted on the upper surface of the boom base end 13a. A protruding portion that protrudes upward by means such as fixing is provided, and this protruding portion is
It may be pivotally connected to the system 11.

In this case, since the boom pivot point is located higher than in the case of the above-described embodiment, the head during crane work can be increased accordingly. Conversely, assuming that the head is the same as that in the above embodiment, the boom length can be shortened by an increase in the boom pivot point. For this reason, the forward projection amount X of the boom 13 during traveling can be further reduced.

(2) In the above embodiment, the rear end of the revolving frame 11 is configured to be the rear end of the revolving superstructure D. However, in order to increase the suspension capacity, the rear end of the revolving frame 11 is provided. A counterweight may be provided as in the prior art, and the rear end of the counterweight may be the rear end of turning.

[0053]

As described above, according to the present invention, (a) the installation position of the winch is determined not on the boom but on the turning frame, so that the hose reel is omitted and the hose is provided below the boom base end of the turning frame. (B) In order to secure the space for the reel installation, (b) raise the boom undulation fulcrum (boom base end) to expand the above space so that the winch can be actually set in this space. The main and auxiliary winding winches are coaxially arranged on the left and right so that a winch with sufficient capacity can be easily and easily installed without protruding beyond the rear turning radius. The boom is tilted forward and downward so that the front end is lower than the base end, so that the side view during running does not worsen by raising The winch is provided so as to cross the side surface of the cabin, whereby the winch having a necessary and sufficient winding capacity can be easily installed without lowering the visibility during driving and important crane performance by the winch.

Further, by installing the winch, which is a heavy object, at the rear end of the revolving frame, the winch plays a role of a counterweight, so that the lifting capacity can be increased.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a conventional example.

FIG. 3 is a side view showing another conventional example.

[Explanation of symbols]

 C Lower traveling structure D Upper revolving structure 11 Revolving frame 12 Cabin 13 Boom 16 Boom foot pin W1, W2 Winch

Claims (1)

(57) [Claims] 1. A wheel crane in which a boom is provided so as to be able to move up and down on a revolving frame of an upper revolving structure provided with a cabin used for both crane operation and traveling.
Te, (A) the relief fulcrum of the boom, eye in the cabin
By setting the height near the point, the boom
A winch installation space is formed below the base end, and (B) both a main winding and an auxiliary winding which drive and wind the hoisting rope.
In the winch space, the right and left coaxial
On the turning frame without protruding backward from the turning end
Provided, the (C) the boom tip is lower than the base end portion ahead
Becomes a downward tilting posture and is lower than the above eye point.
The wheel crane is provided so as to cross the side surface of the cabin at one side position .