JPH03249097A - Wheel crane - Google Patents

Abstract

PURPOSE:To reduce an overhang quantity without causing reduction of a hoisting degree and increase of a turning rear end radial diameter by forming a boom foot so that an upper end of a boom base end under the throw down condition projects upward, and providing a winding winch on the top face of the boom under the throw down condition. CONSTITUTION:A boom foot 61 of a boom 6 is formed so that an upper end of a base end under the throw down condition projects upward, and a turning frame 5 is formed long backward to support the boom foot 61 turnably in the rear end of the turning frame 5 with a pin 62. A winch box 7 is provided on the top face of the boom 6 under the throw down condition, and whiches W1, W2 are housed therein. Consequently, a turnable fitting point of the pin 62 can be positioned in the rear independently of the winches W1, W2, and an overhang quantity of the boom 6 at the time of travelling can be reduced without reducing a hoisting degree and increasing the turning radial diameter.

Description

[Detailed description of the invention]

[0001]

[Industrial application field]

The present invention relates to a wheel crane such as a latte lane crane. [0002]

[Conventional technology]

The general configuration of a conventional wheel crane is shown in FIG. [0003] A is an undercarriage body, B is an upper revolving body mounted on this undercarriage body A, 1 is a revolving frame of this upper revolving body B,
Either the left or right side of this rotating frame 1 is on one side (usually the right side,
(Explained below using this example), a cabin 1a is installed which is used both during crane work and when traveling. [0004] In addition, a winch box 1b is installed at the rear of the swing frame 1.
A main winding winch w1 that drives and winds the main winding rope R1 and an auxiliary winding winch W2 that winds and drives the auxiliary winding rope R2 are housed in the winch box 1b. [0005] 2 is a counterweight that is not attached to the rear surface of the winch box 1b. [0006] On the other hand, 3 is a boom, and a boom foot 31 is provided at the bottom of the base end of the boom 3, and the cono-boom foot 31 is pivotally attached to the upper end of the swing frame 1 by a boom foot pin 32, so that the boom 3 is this boom foot pin 32
It is designed to be able to rise and fall around the center. 3a is a boom hoisting cylinder. [0007] Further, 4 is a gantry provided at the base end of the boom 3,
It has two gantry sheaves 41 and 42, and the winch Wl
, both main and auxiliary ropes R1 and R pulled out from W2.
2 is guided toward the boom tip by this gantry sheave 41.42 [0008]

[Problem to be solved by the invention]

However, according to the conventional crane in which the winches Wl and W2 (winch box lb) are provided at the rear of the swing frame 1 as described above, it is necessary to secure a space for winch maintenance above the winches Wl and W2. On the rope guide by the gantry sheave 41.42, it is desirable that the gantry sheave 41.42 be located in front of the winch WIW2, so the boom foot 31 is located in front of the winches Wl and W2. The entire area will be located closer to the front. [0009] Therefore, the overhang amount (the amount of protrusion toward the front of the vehicle body) X of the boom 3 increases when the crane is traveling, which worsens the forward visibility when traveling, and the minimum turning radius increases, resulting in poor running performance in narrow spaces. There was a problem that the so-called maneuverability deteriorated [0010] It is possible to reduce the overhang amount X by shortening the boom 3, but this would reduce the lifting height during crane work. [0011] In addition, winches Wl, W2 (winch box lb
) can be installed further to the rear and the boom 3 is moved backward, but this increases the radius of the rear end of the swinging upper structure B, which has the disadvantage of interfering with work, especially in narrow spaces. [0012] Accordingly, the present invention provides a wheel crane that can reduce the amount of overhang of the boom without causing the disadvantages of reducing the lifting height or increasing the radius of the rear end of the swing. [0013]

[Means to solve the problem]

The present invention provides a wheel crane in which a boom is movably installed on a revolving frame of an upper revolving body in which a cabin is provided that is shared during crane work and when the crane is traveling, when the boom is in a collapsed state at the base end of the boom. A boom foot is formed by having an upper end protrude upward, and the boom foot is pivotally connected to the revolving frame, and a winch for winding and driving the hoisting rope is installed on the upper surface of the boom when it is in a reclined state. It is what it is. [0014]

[Effect]

In this way, by installing the winch on the boom rather than on the swing frame, the boom pivot point is no longer subject to longitudinal positional restrictions by the winch, so the boom pivot point can be positioned further back than in the conventional case. the entire boom can be retracted. [0015] Therefore, the amount of open hang of the boom during traveling can be reduced compared to the conventional art without causing the disadvantages of a reduction in lifting height or an increase in the radius of the rear end of the swing. [0016] Furthermore, since the winch is located at a higher position than the top surface of the boom, the hoisting rope pulled out from the winch can be directly directed to the tip of the boom. In other words, the gantry required in conventional cranes is no longer required. [0017] By the way, when the winch is installed on the base end side of the upper surface of the boom, the winch protrudes rearward from the rear end of the revolving body when the boom is in its maximum upright state, and the radius of the rear end of the swing becomes large. Therefore, a problem arises in that the boom cannot be raised at a large angle. [0018] This problem can be solved by installing the winch near the tip of the boom, but the disadvantage is that the winch is located on the side or in front of the cabin.
Visibility when moving the crane becomes poor. Furthermore, as the winch approaches the tip of the boom, the lifting ability of the boom is reduced. [0019] As a countermeasure for this point, in this crane, the upper end of the boom base end when the boom is in a collapsed state is made to protrude upward to form a boom foot, so that the boom itself can be improved without providing such a protruding part. Compared to the case where the upper part of the base end is pivoted to the revolving frame as a boom foot, the boom upper surface (rear side) is located forward when the boom is upright, and the boom upright angle at which the winch protrudes toward the rear of the revolving body is correspondingly larger. Become. [00201] That is, it is possible to install the winch at a position on the boom proximal end side where it does not obstruct visibility during travel, without causing an increase in the radius of the rear end of the swing, and while increasing the boom maximum upright angle. [0021]

【Example】

Embodiments of the present invention will be described with reference to FIGS. 1 to 4. [0022] C is a lower traveling body, D is an upper rotating body, 5 is a rotating frame,
5a is a cabin, 51 is a driver's seat provided in the cabin 5a, 6 is a boom, and 6a is a boom hoisting cylinder. [0023] The boom foot 61 of the boom 6 is formed such that the upper end portion of the boom base end side in the boom collapsed state protrudes upward. [0024] In this crane, the swing frame 5 is formed longer rearward than the swing frame 1 of the conventional crane shown in FIG.
It is pivotally connected to the rear end of the boom foot pin 62. [0025] On the other hand, a winch box 7 is installed on the upper surface of the boom 6 in the laid down state, and the winches Wl and W2 are housed in this. [0026] In this way, by installing the winches Wl and W2 on the boom 6 instead of the swing frame 5, the position of the boom pivot point by the boom foot pin 62 can be moved forward of the winches Wl and W2 as in the conventional case. There will be no such restrictions. Therefore, the boom pivot point can be located further back than in the case of conventional cranes. [0027]Thereby, the entire boom can be moved backward more than in the conventional case, and the overhang amount X of the boom 6 during traveling can be significantly reduced compared to the boom open hang amount X of the conventional crane. [0028] In addition, by installing the winch box 7 (winches Wl, W2) on the upper surface of the boom, winches Wl, W2
Since the winches Wl and W2 are located at a higher position than the upper surface of the boom, the ropes R1 and R2 pulled out from the winches Wl and W2 can be directed directly to the tip of the boom. That is, the gantry 4 required in the conventional crane shown in FIG. 4 is no longer necessary in this crane. [0029] Therefore, the structure of the upper revolving body can be simplified and lightened, and the cost can be reduced. [0030] In addition, the winches Wl and W2 are positioned on the base end side of the upper surface of the boom, that is, behind the eye point (standard viewpoint position of the driver) P in the cabin 5a, and in the boom maximum upright state shown in FIG. , is provided at a position that does not protrude rearward beyond the rear surface of the counterweight 8 attached to the rear end of the upper revolving body, that is, the rear end of the revolving frame 5. [0031] Here, as described above, the upper end of the boom base end in the boom collapsed state is made to protrude upward and the boom foot 61
Compared to the case where such a protruding part is not provided and the base end of the boom itself is used as a boom foot and is pivoted to the swing frame 5, it is easier to install the winch when the boom is in its maximum upright position as shown in Figure 4. The upper surface (back surface) of the boom, which is the surface of the boom, will be located at the front. [0032] Therefore, by shifting the winches Wl and W2 forward, the boom upright angle at which the winches Wl and W2 protrude rearward from the rear end of the revolving body increases. That is, when the boom is in its maximum upright state, the winches Wl and W2 do not protrude rearward from the rear end of the revolving body and the radius of the revolving rear end increases. [0033] In other words, the winches Wl, W can be increased without causing an increase in the radius of the rear end of the swing and while increasing the boom maximum upright angle.
2 can be installed on the base end of the boom so that it does not obstruct visibility when driving. [0034] Note that the ropes R1, pulled out from the winches Wl, W2,
In order to prevent R2 from crossing the vicinity of the eye point P and obstructing the side view when the crane is traveling, a pair of left and right cylindrical rope hooks 63 are provided almost horizontally on the side of the cabin 5a on the upper surface of the boom. R1 and R2 are hooked onto this rope hook 63 so as to approach the upper surface of the boom. [0035] Incidentally, the winches Wl and W2 may not be housed in the winch box 7, but may be attached to the upper surface of the boom in an exposed state. [0036]

【Effect of the invention】

As described above, according to the present invention, by installing the winch on the upper surface of the boom instead of the revolving frame, the boom pivot point can be located as far back as possible regardless of the winch, so that the lifting height can be reduced. The amount of open hang of the boom during traveling can be reduced compared to the conventional method without causing the disadvantages of decreasing the turning radius or increasing the radius of the rear end of the swing. [0037] For this reason, the forward visibility during driving is improved, so driving safety is improved, driver fatigue is reduced, and running performance in narrow spaces is improved. [0038] Furthermore, since a gantry for guiding the rope pulled out from the winch toward the tip of the boom is not required, the structure of the upper revolving body can be simplified, the weight can be reduced, and the cost can be reduced. [0039]Furthermore, since the upper end of the boom base end when the boom is laid down projects upward to form a boom foot, the base end of the boom itself can be turned as a boom foot without providing such a protruding part. Compared to the case where the boom is pivoted to the frame, the upper surface (back surface) of the boom is located forward in the boom upright state, and the boom upright angle at which the winch projects to the rear of the revolving body increases accordingly. [0040] That is, it is possible to install the winch on the base end side of the boom where it does not obstruct the side view during travel, without causing an increase in the radius of the rear end of the swing, and while increasing the boom maximum standing angle. .

[Brief explanation of drawings]

FIG. 1 is a side view of a wheel crane according to an embodiment of the present invention.

[Figure 2] It is a top view of the same crane.

[Figure 3] FIG. 2 is an enlarged sectional view taken along the line E in FIG. 1;

FIG. 4 is a partially enlarged side view of the same crane with the boom in its maximum upright state.

[Figure 5] FIG. 2 is a side view showing a conventional example.

[Explanation of symbols]

C lower running body D　Upper rotating body 5 Swivel frame 5a Cabin 6 Boom 61 Boom foot Wl, W2 Winch R1, R2 upper volume (main volume) 7 Winch box rope ]Document name】 drawing

[Figure 1] death

[Figure 3]

[Figure 4]

[Figure 5]

Claims (1)

[Claims] 1. In a wheel crane in which a boom is movably installed on a revolving frame of an upper revolving body that is provided with a cabin that is shared during crane work and during crane travel, the upper end of the boom in the boom collapsed state at the base end of the boom. A boom foot is formed by protruding upward, and the boom foot is pivotally connected to the revolving frame, and a winch for winding and driving the hoisting rope is installed on the upper surface of the boom when it is in a collapsed state. A wheel crane characterized by: