JPH0346995A - Wheel crane - Google Patents

Abstract

PURPOSE:To heighten the lift of a boom while positioning the boom lower than an eye point at the time of running by providing the base end part of the boom with protruding parts protruding on the upper face side of the boom in the laid-down state and fixing these protruding parts pivotally at an upper revolving body. CONSTITUTION:Both flanks of the boom foot 15a of a swing boom 13 are provided with brackets 15 fitted as protruding parts protruding above the boom 13 in the laid-down state. The protruding parts 15a are positioned at the upper end as well as rear end of the boom 13 and pivotally fixed at a revolving frame 11 by a foot pin 16. This boom fixing point is set into such a position that the boom 13 in the laid-down state is placed lower than the eye point P of a cabin 12 and that within the turning rear-end radius of the revolving frame 11. The boom fixing point is thereby positioned higher than the existing ones, so that the lift of the boom in action is heightened as well as the eye point P is prevented from being blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wheel crane in which a cabin is provided on the upper revolving body and is used both during crane operation and during travel reporting.

[Conventional technology]

The general structure of a conventional wheel crane of this type will be explained with reference to FIG.

A is the lower traveling body, B is the upper rotating body, and this upper rotating body B
has a revolving frame 1, and on either the left or right side of the revolving frame 1 (usually the right side as shown in the figure, hereinafter explained in this example), there is a cabin that is shared during crane operation and traveling operation. (Driver's cab) 2 will be installed.

Further, the swing frame 1 is provided with a winch box 3 at its rear, and inside this winch box 3, there is a main winding winch W1 for winding and driving the main winding rope R1, and a main winding winch W1 for winding and driving the auxiliary winding rope R2. An auxiliary winding winch W2 is housed there. 4 is a counterweight attached to the rear surface of this winch box 3.

Further, a boom 5 is pivotally attached to the revolving frame 1 so as to be able to rise and fall freely. This boom 5 has a base end portion (hereinafter referred to as boom foot) 5a whose lower surface side portion when the boom is in use is pivotally attached to the upper end portion of the swing frame 1 by a boom foot pin 6, and when the crane is traveling, the lower surface side portion is Horizontal lodging! ! ! (hereinafter referred to as the maximum utilization state).

Reference numeral 7 denotes a boom hoisting cylinder for hoisting the boom 5.

Furthermore, two gantry sheaves 8 are installed at the base end of the boom 5.
A gantry 8 having windings a and 8b is provided, and both main and auxiliary winding ropes Rj and R2 pulled out from the winch Wj, W,2 form a gantry sheave 8a.

8b toward the tip of the boom.

In this conventional general wheel crane, in order to increase the lifting height of the boom 5 as much as possible, the entire boom 5 is pivotally attached to the swing frame 1 at a position as high as possible, as shown in the figure.

However, as a result, when the boom is in the maximum utilization state, the boom 5 is located at the upper left side of the cabin 2 as shown in the figure, that is, at the eye point P (eye point Regarding the definition of , the height position of There was a problem with poor lateral visibility because the vehicle had to cross the road. On the other hand, according to the conventional crane in which winches W1 and W2 (winch box 3) are provided behind the swing frame 1,
The radius of the turning rear end of the upper rotating body B increases by the amount of the winches Wi and w2.

Furthermore, the boom foot 5a is arranged in front of the winches w1 and w2 due to the need to secure a space for winch maintenance above the winches w1 and w2. Therefore, as a result of the entire boom 5 being located closer to the front, the forward protrusion amount χ of the boom 5 when the crane is traveling
As a result, the protruding portion of the boom resulted in poor left front visibility (combined with the aforementioned poor side visibility), this caused problems with driving safety.

Although it is conceivable to shorten the boom 5 to reduce its forward protrusion amount χ, this would reduce the lifting height and eliminate the meaning of arranging the boom 5 at a high position. It is also possible to move the boom 5 backward by installing the winches w1 and w2 further back, but this will increase the radius of the rear end of the swing, which will have the disadvantage of interfering with work, especially in narrow spaces. Therefore, neither is a good idea.

Therefore, as a means to solve these problems, the method disclosed in Japanese Unexamined Patent Publication No. 63-37097 filed by the present applicant was proposed. To explain this with reference to FIG. 4, (a) By pivotally attaching the upper surface side of the boom foot 5a to the swing frame 1, the boom 5 can be laid down at a low position when traveling, improving visibility on the left side while traveling; b) By relocating the winches w1 and w2 from the upper revolving structure B to the upper surface of the boom 5 in the usage state, the entire boom 5 is shifted rearward by the amount of the winches, while the radius of the rear end of the swing remains the same as before. This makes it possible to reduce the amount of forward protrusion 9 of the boom during traveling.

[Problem to be solved by the invention]

However, even with this configuration, the following problems still remain.

■ To describe the configuration of (a) above in detail, the boom foot 5a
A cylindrical boss 9 is fixed to the corner of the upper surface when the boom is in use, and this cylindrical boss 9 is pivotally connected to the revolving frame 1 by a boom foot pin 6. That is, the boom pivot point is set at the highest position within the thickness of the boom 5.

/ Note that 9a is a reinforcing rib for reinforcing the cylindrical boss 9.

However, according to this configuration, the lifting height during crane work remains at the same level as that of conventional cranes, and the lifting height cannot be increased further.

Therefore, if you want to further increase the lifting height, you must increase the length of the boom at the risk of increasing the forward protrusion (mg) of the boom when traveling, and in the end, the significance of adopting the configuration (b) is lost. It will fade.

(2) According to configuration (b) above, on the premise that the radius of the rear end of the swing remains the same as before, it is a condition that the winch does not protrude rearward from the rear end of the swing when the boom is in the maximum upright state. This condition can be fully satisfied with a crane whose maximum boom angle is small, but cannot be satisfied with a crane whose maximum boom angle is large. In other words, according to the configuration (b), the maximum boom angle cannot be increased.

Note that if you move the winch position closer to the tip of the boom, you can increase the maximum boom angle while still satisfying the condition that the winch does not protrude rearward. Visibility on the left side becomes poor.Furthermore, as the winch approaches the tip of the boom, the lifting ability of the boom decreases.

Therefore, the present invention has developed a wheeled crane that allows the boom to be laid down at a low position that does not obstruct lateral visibility when traveling, and that also allows the boom foot to be set at a higher position than before during crane work to expand the lifting height. It provides:

The present invention also provides a wheel crane that can increase the maximum upright angle of the boom within a range that satisfies the condition that the winch does not protrude rearward when the winch is installed on the upper surface of the boom.

[Means to solve the problem]

The invention of claim 1 is such that a boom is attached to a revolving frame of an upper revolving body in which a cabin is provided which is shared during crane operation and traveling operation, and the boom is movable up and down, and the above-mentioned cabin is installed in a state in which the cabin is used during traveling operation. In a wheel crane that is pivotally mounted so as to cross one side, a protruding portion is provided at the base end of the boom that protrudes upward when the boom is in use, and this protruding portion is connected to the rotating frame. The boom is pivoted at a vertical position where it crosses one side of the cabin at a position below the eye point in the cabin when the boom is used during traveling.

Further, the invention according to claim 2 is the configuration according to claim 1, in which a protruding portion is formed by attaching a bracket to the base end of the boom.

Furthermore, the invention of claim 3 is such that, in addition to the configuration of claim 1 or 2, the pivot point in the longitudinal direction of the protruding portion of the boom base end with respect to the revolving frame is set at the maximum rearward position of the revolving frame. It is.

Furthermore, the invention of claim 4 is based on the structure of any one of claims 1 to 3, and the vertical pivot point of the protruding portion of the boom base end with respect to the revolving frame is such that the boom is in a state in which the boom is used during traveling. It is set in a position where it slopes downward.

In addition to the structure of any one of claims 1 to 4, the invention according to claim 5 is configured such that the rear end of the revolving frame becomes the rear end of the upper revolving body.

On the other hand, the invention of claim 6 is based on the structure of any one of claims 1 to 5, and the winch for winding and driving the hoisting rope is attached to the upper surface of the boom when the boom is in use. It is installed behind the eye point in the cabin.

[Effect]

According to the configurations of claims 1 to 6, since the boom is pivotally attached to the revolving frame at a position further above the upper surface of the boom, the boom position during traveling can be lowered to below the eye point, and the boom can be adjusted during crane work. The foot position can be raised. In other words, the lifting height of the boom can be increased with the same boom length as before.

Further, according to the second aspect of the present invention, in which the protruding portion is formed by attaching a bracket to the base end of the boom, processing of the protruding portion is easy.

Furthermore, according to the structure of claim 3, the amount of forward protrusion of the boom during traveling can be reduced with the same boom length as the conventional one.

Furthermore, according to the configuration of claim 4, the boom pivot point can be set at a higher position to increase the lifting height while ensuring lateral visibility during traveling.

Moreover, according to the structure of claim 5, the turning rear end radius can be reduced.

On the other hand, according to the structure of claim 6, since the boom pivot point protrudes from the top surface of the boom, the top surface of the boom is located further forward than before when the boom is in the upright state, so that the winch installed on the top surface of the boom can be attached to the rotating frame. The angle at which the boom protrudes from the front becomes larger than before. That is, it is possible to increase the maximum upright angle of the boom within a range that satisfies the condition that the winch does not protrude behind the revolving frame.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

C is a lower traveling body, D is an upper revolving body, 11 is a revolving frame of the upper revolving body, 12 is a cabin provided on this revolving frame 11, 13 is a boom pivotably attached to the revolving frame 11, 14 is the boom hoisting cylinder.

In this crane, the rear end of the revolving frame 11 is not provided with any rear protruding object such as the counterweight 4 in the conventional crane shown in FIG. 4, and the rear end of the revolving frame 11 is the rear end of the upper revolving body. In other words, it is configured to be the rear end of the turn.

Note that lla is a protective bumper of the swing frame 11, and the rear surface of this bumper lla becomes the swing rear end.

On the other hand, brackets 15 are provided on both left and right sides of the boom foot 13a so as to protrude toward the upper surface of the boom when the boom is in use. )) 15a is pivotally connected to the revolving frame 11 by a boom foot pin 16.

This boom pivot point is: (a) The vertical position is the position where the boom 13 crosses the left side of the cabin 12 at a position below the eye point P inside the cabin 12 when the boom is used during traveling. (b) The longitudinal position is set to the maximum rearward position within a range where the pivoting portion does not extend outside the radius of the rear end of the swing frame 11.

In this way, the bracket 15 is attached to the boom foot 13a, and the protruding portion 15a that protrudes upward from the boom is provided.
By pivotally attaching the protruding portion 15a to the rotating frame 11, the boom 13 can be pivotally attached to the rotating frame 11 at a position above the top surface of the boom. That is, since the boom pivot point is located higher than that of the conventional crane shown in FIG. 4, the lifting height during crane work can be increased accordingly.

Conversely, if the lifting height is kept the same as before, the boom length can be shortened by the increased height of the boom pivot point.

Furthermore, by satisfying the condition (a) above, it is possible to ensure left visibility during driving.

In addition, in this embodiment, in order to position the boom pivot point as high as possible within the range that satisfies the condition (a) above, the swing frame 11 is replaced with the swing frame of the conventional crane shown in FIG. 3-4. The boom 13 is extended upwardly and a boom pivot point is set at its upper end, so that the boom 13 is laid down in a posture that is greatly tilted downward as shown in the figure when traveling.

In this way, the lift height can be further increased or the boom length can be shortened while ensuring visibility on the left side.

In addition, since the swing frame 11 is the swing rear end of the upper revolving body and the boom pivot point is set at the maximum rear end position of the swing frame 11, if the swing rear end radius is set to the same as before, The boom pivot point will be located further back than before.

Due to the synergistic effect of this point, the above-mentioned ability to shorten the boom length, and the point that the boom 13 is laid down in a downward tilting position during travel, the amount of forward protrusion 2 of the boom 13 during travel can be minimized. becomes possible.

In addition, by shifting the boom pivot point further back than in the past, the distance from the center of rotation to the boom pivot point becomes longer, thereby increasing the suspension stability.

Therefore, even if the counterweight is omitted, the same lifting capacity as the conventional one can be ensured.

On the other hand, the boom 13 has a main winding rope R on the upper surface on the base end side.
A main winding winch W1 that takes up and drives the auxiliary winding rope R2 and an auxiliary winding winch W2 that drives the auxiliary winding rope R2 are coaxially arranged.

The winches w1 and w2 are mounted on the upper surface of the base end of the boom in the cabin when the boom is in use during traveling.

2, and the rear end of the swing frame 11 (bumper
It is installed so that it is located forward of the rear surface of (a).

Here, as described above, since the boom pivot point protrudes from the top surface of the boom due to the protruding portion 15a, the top surface of the boom shifts forward compared to the top surface of the conventional boom when the boom is in the upright state. W2 will also be located further forward than in the conventional case. For this reason, this winch w1, w
2 protrudes rearward from the rear end of the swing frame 11, and the boom upright angle becomes larger than that of the prior art. That is, the maximum upright angle of the boom can be increased within a range that satisfies the condition that the winches w1 and w2 do not protrude to the rear of the swing frame.

In addition, in the figure, 17 is a rope guide installed on the top of the boom,
Reference numeral 18 denotes a boom rest that regulates the position of the boom 13 in the boom width direction during traveling. Further, the lower traveling body C is provided with outriggers, which are standard equipment for cranes, on both the front and rear sides, but are not shown here.

Other Embodiments (1) The bracket 15 may be provided protruding from the upper surface of the boom. In addition, the shape of the bracket 15 and the protrusion dimension of the protruding portion 15a from the top surface of the boom are determined by the set position of the boom pivot point,
It can be selected as appropriate depending on the required bracket strength, etc.

(2) As a means for forming the protruding part of the boom base end,
A bracket 15 separate from the boom 13 as in the above embodiment
Instead of the means for providing the boom 13, the base end portion itself of the boom 13 may be made to protrude upward.

(3) In the above embodiment, the boom 13 is laid down in a tilted position with the tip downward when traveling, but the boom 13 is laid down horizontally within a range that satisfies the condition that the boom 13 crosses below the eye point P. You may also do so.

(4) In the above embodiment, the revolving frame 11 is configured to be the revolving rear end of the upper revolving body, but in order to increase the lifting capacity, a counterweight is provided at the rear end of the revolving frame 11 as in the conventional case, and this counterweight The rear end may be configured to be the turning rear end.

〔Effect of the invention〕

As described above, according to the inventions of claims 1 to 6, by providing the protruding portion at the base end of the boom that protrudes toward the upper surface side when the boom is in use, and pivoting this protruding portion to the upper revolving structure, Since the boom is pivotally attached to the revolving frame at a position further above the top surface of the boom, the boom foot position during crane work can be raised while lowering the boom position during travel to below the eye point. In other words, the lifting height of the boom can be increased with the same boom length as before. Alternatively, if the lifting height is kept the same as before, the boom length can be made smaller than before.

Further, according to the second aspect of the present invention, in which the protruding portion is formed by attaching a bracket to the base end of the boom, processing of the protruding portion is easy.

Furthermore, according to the third aspect of the present invention, the amount of forward protrusion of the boom during traveling can be reduced with the same boom length as the conventional one.

Further, according to the invention of claim 4, while ensuring lateral visibility while traveling, the boom pivot point is set at a higher position to increase the lifting height, or the boom length is reduced with the same lifting height as before. be able to.

Further, according to the invention of claim 5, in which the rear end of the revolving frame is the rear end of the revolving upper structure, the radius of the revolving rear end can be reduced. Alternatively, if the radius of the rear end of the swing is the same as before, the boom pivot point can be positioned further back than before.

Therefore, due to the synergistic effect of the inventions of claims 1 to 5, the amount of forward protrusion of the boom during driving can be significantly reduced compared to the conventional one, thereby greatly improving the driving visibility and improving driving safety. can be increased.

On the other hand, according to the invention of claim 6, since the boom pivot point protrudes from the top surface of the boom, the top surface of the boom is located further forward than before when the boom is in the upright state, so that the winch installed on the top surface of the boom can be attached to the rotating frame. The angle at which the boom protrudes from the front becomes larger than before. That is, it is possible to increase the maximum upright angle of the boom within a range that satisfies the condition that the winch does not protrude to the rear of the boom.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are side views showing the second side of a conventional example. C... Lower traveling body, D... Upper revolving body, 11...
Swivel frame, 12...Cabin, 13...Boom, 15...Bracket for forming a protruding part of the base end of the boom, 15...Protruding part of the bracket, 16
...Boom foot pin, wl, w2... winch.

Claims (1)

[Scope of Claims] 1. A boom is attached to a revolving frame of an upper revolving body in which a cabin is provided which is shared during crane operation and traveling operation, and the boom is movable up and down, and when the cabin is used during traveling operation, the above-mentioned cabin is installed. In a wheel crane that is pivotally mounted so as to cross one side, the base end of the boom is provided with a protruding part that protrudes upward when the boom is in use, and this protruding part is attached to the rotating frame. The wheel crane is characterized in that the boom is pivoted at a position in the vertical direction such that when the boom is in a collapsed state during traveling, the boom crosses one side of the cabin at a position below the eye point in the cabin. 2. The wheel crane according to claim 1, wherein a bracket is attached to the base end of the boom to form a protruding portion. 3. The wheel crane according to claim 1 or 2, wherein the pivot point in the longitudinal direction of the protruding portion of the boom base end with respect to the revolving frame is set at the maximum rearward position of the revolving frame. 4. Claim 1, wherein the vertical pivot point of the protruding portion of the boom base end with respect to the revolving frame is set at a position where the boom is tilted downward when the boom is in a collapsed state during traveling. The wheel crane according to any one of 3 to 3. 5. The wheel crane according to any one of claims 1 to 4, wherein the rear end of the revolving frame is configured to be the rear end of the upper revolving body. 6. A winch for winding and driving the hoisting rope is installed on the upper surface of the boom when it is in the collapsed state, and is located behind the eye point in the cabin when the boom is in the collapsed state when traveling. The wheel crane according to any one of claims 1 to 4.