JPH0455295A - Wheel crane - Google Patents

Abstract

PURPOSE:To prevent to make a disturbance of the field of vision by a boom derricking cylinder in the running condition, by providing the second link to guide the connection between the first link and the boom derricking cylinder in the direction to extend a refraction link body which is composed of the boom derricking cylinder and the first link, following the erection of the boom. CONSTITUTION:The front end of the first link 10 is connected to the rear end of a boom derricking cylinder 9, and the rear end of the first link 10 is connected to a boom 5. When a refraction link body A composed of the boom derricking cylinder 9 and the first link 10 is expanded following the erection of the boom 5, the stroke of the boom derricking cylinder 9 is increased. As a result, the largest erection angle of the boom 5 is secured even though the boom derricking cylinder 9 is a short device arranged at the lower side of the boom 5. Since the cylinder 9 can be arranged in the condition not crossing the side of an eye point P, in the lower side of the boom 5 (within the boom width), the boom width and the cabin width receive no restriction from the boom derricking cylinder, and thereby the boom strength and the residental freedom can be secured, and the field of vision in the running condition is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wheel crane with an improved boom hoisting device.

[Conventional technology]

In FIGS. 4 and 5, 1 is a lower traveling body, 2 is an upper revolving body, 3 is a revolving frame of this upper revolving body 2, and a cabin (driver's cab) 4 is shared during crane work and traveling. However, on either the left or right side of this rotating frame 3 (usually the right side as shown in the figure, this example will be explained below)
It is installed in

Further, the revolving frame 3 is provided so as to be able to rise and fall freely around the boom 5 or the boom foot pin 6, and to cross the left side of the cabin 4 when the crane is in the maximum collapsed state when the crane is traveling.

A boom hoisting cylinder 7 for hoisting the boom 5 is installed at an eye point P (which is the standard vertical and horizontal viewpoint position of the operator in the cabin 4) so as not to obstruct the left view of the operator when the crane is traveling. Regarding the definition of this eye point, refer to page 68 of the New Vehicle Examination-Related Standards Collection supervised by the Vehicle Inspection Division, Land Safety Department, Regional Transport Bureau, Ministry of Transport, and the Vehicle Inspection Division, Traffic Safety and Pollution Research Institute, Ministry of Transport. It is attached between the swing frame 3 and the boom 5 in an upwardly inclined position without crossing.

In this case, the boom hoisting cylinder 7 needs to have a certain length in order to ensure the maximum rising angle (approximately 80 degrees) of the boom 5. If this length is ensured, the boom hoisting cylinder 7 will not be able to fit under the boom.

Note that if the inclination angle of the cylinder 7 is made gentle, even if the cylinder 7 is made longer, it can be accommodated under the boom. However, in this case, the cylinder axis is directed near the center of the boom foot pin 6, which is the boom hoisting center, and the boom hoisting function inherent to the boom hoisting cylinder is lost.

Conventionally, as shown in the figure, the boom hoisting cylinder 7 was placed on the side of the boom 5 in plan view, and a pair of left and right cylinder tuffs were provided in order to balance the left and right sides.

[Problem to be solved by the invention]

However, as a result of arranging the thick boom hoisting cylinders 7.7 at both sites of the boom 5 within such a limited vehicle width,
The width of the boom 5 is restricted, resulting in insufficient boom strength, and the width of the cabin 4 is also restricted, resulting in poor livability.

For this reason, in order to ensure sufficient boom strength and livability, a single boom hoisting cylinder 8 has been conventionally placed at the widthwise center of the boom 5 when the boom is in its maximum lodging state, as shown in FIG. are doing. As a result, the boom hoisting cylinder 8 occupied the left field of view during travel. For this reason, in wheel cranes that have poor visibility when traveling due to the large amount of forward protrusion of the boom 5, the visibility becomes increasingly narrow, causing problems in traveling safety, and is particularly dangerous when turning left.

SUMMARY OF THE INVENTION Therefore, the present invention provides a wheel crane that ensures sufficient boom strength and comfort, as well as a maximum boom raising angle, and in which the boom hoisting cylinder does not obstruct visibility during travel.

[Failure to solve the problem]

The present invention provides a state in which a swinging frame of an upper revolving structure is provided with a cabin that is shared during crane work and when the crane is traveling, and a boom that can be raised and lowered crosses one side of the cabin in the maximum lodging state during traveling. In the wheel crane installed in
The boom is positioned forward of the boom's center of undulation, with its front end connected to the revolving frame, and is placed on the underside of the boom in an upwardly tilted position that does not cross the side of the eye point in the cabin. No. 1 at the rear end of the boom hoisting cylinder.
The front ends of the links are connected, and this first link connects the rear end or the boom with its axis inclined upward relative to the axis of the boom hoisting cylinder and directed above the boom hoisting center in the boom's maximum lodging state. a second link that is connected to the boom hoisting cylinder and guides the connection point between the first link and the boom hoisting cylinder in a direction in which the bending link body formed by the boom hoisting cylinder and the first link extends as the boom rises; It is provided between the connection point and the rotating frame.

[Effect]

With this configuration, the cylinder thrust of the boom hoisting cylinder can be directed upward from the boom hoisting center by the first link. Therefore, the boom can be raised and lowered without any trouble.

Moreover, the bending link body constituted by the boom hoisting cylinder and the first link extends as the boom rises, thereby substantially increasing the stroke of the boom hoisting cylinder. For this reason, even though the boom hoisting cylinder is short and is disposed below the boom, it is possible to ensure the maximum rising angle of the boom.

In this way, while performing its original function, the boom hoisting cylinder can be placed on the underside of the boom (within the boom width) without crossing the side of the eye point. There is no restriction on width, so sufficient boom strength and livability can be ensured, and visibility during driving can be improved.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1-3.

To explain only the differences from the prior art shown in FIGS. 4 to 6, the boom hoisting cylinder 9 for hoisting the boom 5 is located at a position forward of the boom foot pin 6, which is the center of hoisting the boom 5. (b) At the center of the lower side of the boom 5 in the width direction of the boom, (c) It is arranged in an upwardly inclined position that does not cross the side of the eye point P in the cabin 4.

The boom hoisting cylinder 9 has a front end, that is, the base end of the cylinder tube 9a, connected to the front end of the swing frame 3 by a pin, and a rear end, that is, the tip of the piston rod 9b, or the first end.
It is connected to the base end of the boom 5 via a link 10.

The first link 10 is configured such that its axis I2 is inclined upward with respect to the axis 11 of the boom hoisting cylinder 9 when the boom 5 is in the maximum lodging state, and is directed toward the L force rather than the boom foot pin 6, so that the front end of the first link 10 A pin 11 is attached to the tip of the piston rod of the undulating cylinder 9, and the rear end is attached to the upper part of the boom base end.
, 1.2, and the boom hoisting cylinder and this first link 10 constitute a bending link body A.

Further, the front end of the second link 13 is connected to a connection point (pin 11) between the boom hoisting cylinder 9, which is a bending/extending fulcrum of the bending link body A, and the first link 10.

This second link] 3 is attached to the rear end of the swing frame 3 with a pin 14 so that it is almost parallel to the bottom surface of the boom when the boom is at its maximum lodging position, and follows the ups and downs of the boom 5 due to the telescoping operation of the boom hoisting cylinder 9. It rotates around this pin 14.

Therefore, the connection point moves on the front end rotation locus of the second link 13, and is pushed up as the boom 5 rises from its maximum collapsed state. As a result, the bending link body A is aligned with the axis 1 of the boom hoisting cylinder 9 and the first link 10. ．． 12 deforms or stretches in the same direction. In this embodiment, as shown in FIG. 2, the bending link body A is configured to be in a state slightly beyond the straight state when the boom is in its maximum upright state.

In this way, as the bending link body A extends when the boom 5 is raised, the straight distance between both ends of the bending link body A increases, so that the stroke of the boom hoisting cylinder 9 substantially increases by this increase. That will happen.

As a result, even if the boom hoisting cylinder 9 has a length that cannot ensure the maximum boom raising angle by itself, that is, it is a short cylinder that can be placed below the boom 5, the maximum lifting angle of the boom 5 can be sufficiently maintained. can be secured.

In addition, the cylinder thrust (boom hoisting force) of the boom hoisting cylinder 9 acts on the attachment point (pin 14) of the first link 10 to the boom 5, which is located above the boom foot pin 6, so the boom hoisting force is The action is carried out without any hindrance.

In other words, the boom hoisting cylinder 9 must be positioned at the bottom of the boom (within the boom width) and the eye point P must be satisfied using both links 10. This made it possible to place it in an upward tilted position without crossing it.

Therefore, the problem that the width dimensions of the boom 5 and the cabin 4 are kept small by the boom hoisting cylinders 7 provided on both sides of the boom 5, as in the case of the prior art shown in FIGS. 4 and 5, is eliminated, and these width dimensions are reduced. can be set independently of the boom hoisting cylinder 9. Therefore, sufficient boom strength and livability can be ensured.

Since the boom hoisting cylinder 9 does not cross the eye point P, the visibility to the left during traveling is significantly improved compared to the prior art shown in FIG.

In addition, since the first link 10 is arranged on the side of the boom 5 with respect to the boom hoisting cylinder 9 arranged on the lower side of the boom 5, the first link 10 and the second link 13 are arranged on both left and right sides, respectively. The left and right links are connected to the boom hoisting cylinder 9, the swing frame 3, and the boom 5 by connecting pins i, 1.12, 1.3.

Incidentally, in the above embodiment, a wheel crane is taken as an example in which the boom 5 is pivotally connected to the swing frame 3 by the boom foot pin 6 at the upper part of the base end.
Of course, the present invention can also be applied to a wheel crane which is pivotally connected to the revolving frame 3 at the lower part of the base end.

〔Effect of the invention〕

As described above, according to the present invention, the boom hoisting cylinder for hoisting the boom is placed at a position forward of the hoisting center of the boom, and is placed under the boom in an upwardly inclined position that does not cross the side of the eye point in the cabin. A first link is provided between the boom hoisting cylinder and the boom to form a bending link body, and a second link is configured to extend the bending link body as the boom rises. Therefore, while fulfilling the original function of the boom hoisting cylinder, which is to perform the boom hoisting action and ensure the maximum boom raising angle, the boom width and cabin width are not limited by the boom hoisting cylinder, and therefore sufficient boom strength and livability can be achieved. In addition to this, visibility during driving can be significantly improved. Therefore, driving safety is improved, especially when turning left.

[Brief explanation of drawings]

Fig. 1 is a side view of the foil clay boom according to the embodiment of the present invention in its maximum collapsed state, Fig. 2 is a schematic side view of the same boom in its maximum upright state, Fig. 3 is its front view, and Fig. 4 is a conventional technology. FIG. 5 is a plan view of the same, and FIG. 6 is a schematic side view of a wheel crane to explain another conventional technique. 2... Upper revolving body, 3... Swivel frame, 4... Cabin, 5... Boom, 6... Boom foot pin as boom undulation center, A... Bent link body, 9.
Boom hoisting cylinder 11 constituting the bending link body
・Axis of the same cylinder, 10...First link, I2・Axis of the same link, 13...Second link. Patent applicant Kobe Steel, Ltd. Representative Patent attorney Etsushi Kotani Patent attorney
1) Masamukai Patent Attorney Takao Ito

Claims (1)

[Claims] 1. On the revolving frame of the upper revolving body, which is equipped with a cabin that is used both during crane work and when traveling, a boom that can be raised and lowered is installed so that it crosses one side of the cabin in the maximum lodging state during traveling. In the wheel crane,
The boom hoisting cylinder for hoisting the boom is in a position forward of the hoisting center of the boom, the front end is connected to the revolving frame, and the boom is in a rearward tilting position that does not cross the side of the eye point in the cabin. The front end of the first link is connected to the rear end of the boom hoisting cylinder, and the axis of the first link points upward with respect to the axis of the boom hoisting cylinder when the boom is at maximum lodging. The rear end is connected to the boom in such a manner that the rear end thereof is inclined upwardly from the boom's undulation center, and the bending link body constituted by the boom undulation cylinder and the first link extends in the direction in which the boom is erected. A wheel crane characterized in that a second link that guides a connection point between the first link and the boom hoisting cylinder is provided between the connection point and the swing frame.