JP2003095580A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability by saving the time for removing a handrail from car body for transportation. SOLUTION: The cylindrical bracket 22 of a handrail device 21 is fixed on the upper face side of the housing cover 4 of an upper revolving superstructure 2, and a handrail receiver 25 is fixed to the cylindrical bracket 22. A shaft support plate 23 is fixed to the cylindrical bracket 22 and is provided with a shat pin 27. The shaft pin 27 is inserted into the long hole 26D of the handrail 26. For maintenance work, the handrail 26 is held standing upward from the cylindrical bracket 22 using a β pin 29. For transporting a crawler crane, the handrail 26 is turned downward to be placed on the handrail receiver 25 and is fixed to the handrail receiver 25 using the β pin 29 as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic crane or a hydraulic excavator, and more particularly to a construction machine having a body and a passage through which a worker passes and a handrail.

[0002]

2. Description of the Related Art Generally, a crawler crane is known as a construction machine used for transporting materials from the ground to a high place at a construction site such as a high-rise building. The crawler crane is composed of a lower traveling body, an upper revolving body rotatably provided on the lower traveling body, and a work device provided on the front side of the upper revolving body. Further, the working device is roughly configured by a boom whose base end side is attached to an upper revolving structure so as to be capable of being raised and lowered, and a hook which is attached to a main winding rope suspended from the boom.

Further, the crawler crane according to this prior art has an upper revolving structure which constitutes a vehicle body together with a lower traveling structure.
A building cover for accommodating equipment is provided, and a passage for a worker to walk during maintenance work and a handrail for gripping the worker when walking through the passage are provided on the upper surface side of the building cover. .

[0004]

By the way, in the above-mentioned hydraulic crane, the height of the handrail depends on the crane structure standard,
In order to satisfy the ISO standard and the like, the size is set to 900 mm or more, for example. However, when the crane is transported, the handrail height becomes higher than the prescribed transportation height.

Therefore, in the prior art, the handrail was previously removed at the time of transportation and the transportation was performed in this state.
For this reason, the work of attaching and removing the handrail during transportation is a great work for the worker, and there is a problem that workability is reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to save the labor of previously removing the handrail from the vehicle body during transportation and to improve workability. The purpose is to provide such construction machinery.

[0007]

In order to solve the above-mentioned problems, the construction machine according to the present invention is provided with a vehicle body having a passage through which an operator can pass, and is provided so that the vehicle body can be lifted and lowered. And a handrail device to be gripped by an operator passing along the passage.

The features of the configuration adopted by the invention of claim 1 are that the handrail device has a working position in which the handrail stands up on the vehicle body at the time of work, and a transportation that is folded on the vehicle body when the vehicle body is transported. It is configured to be foldable between the position and the position.

With this construction, the handrail device can be easily walked in the passage while holding the handrail device by disposing the handrail device at the work position during maintenance work or the like. Also, by folding the handrail device from the working position to the transport position, the height of the handrail device can be kept lower than the transport height.

According to a second aspect of the invention, the handrail device is
It is composed of a bracket extending upward from the vehicle body and a handrail attached to the upper end side of the bracket so as to be pivotable upward and downward. With this structure, the handrail can be folded from the working position to the transport position by rotating the handrail with respect to the bracket in the upward and downward directions.

Further, in the invention of claim 3, the handrail device is provided with a tubular bracket having a lower end side attached to the vehicle body and a pin hole provided on the upper end side, and protruding upward from the upper end side of the tubular bracket. A shaft support plate having a shaft hole formed therein,
A handrail receiver that is located on the side of the shaft support plate and is attached to the tubular bracket and is provided with a pin hole, and an elongated hole is provided on the lower end side and a pin hole is provided below the elongated hole. Handrail, a shaft pin that is inserted into the shaft hole of the shaft support plate and the long hole of the handrail, and supports the handrail so that the handrail can be folded back, a working position where the handrail is erected on a tubular bracket, and the hand. It is configured by a pin member that supports the slide at a transportation position in which the slide is folded on a handrail receiver.

With this configuration, the pin member is removed from the handrail during maintenance work and the like, and in this state the handrail is inserted downward into the tubular bracket through the elongated hole and the shaft pin. Next, by inserting the pin member into the pin hole of the handrail from the pin hole of the tubular bracket, the handrail can be held in the working position which is erected upward from the tubular bracket.

During transportation of the vehicle body, the pin member is removed from the handrail, and the handrail is lifted upward until the shaft pin engages with the lower end of the elongated hole. Then, the handrail is rotated about the shaft pin so as to be tilted downward, and the handrail is folded and placed on the handrail receiver. Then, finally, the handrail can be held at the transportation position by inserting the pin member from the pin hole of the handrail receiver into the elongated hole of the tubular bracket.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine according to the present invention is applied to a crawler crane as an example, and will be described in detail with reference to the accompanying drawings of FIGS. 1 to 9.

In the figure, 1 is a lower traveling body, 2 is an upper revolving body provided on the lower traveling body 1 so as to be rotatable, and the upper revolving body 2 constitutes a vehicle body of a crawler crane together with the lower traveling body 1. is doing. The upper revolving structure 2 includes a revolving frame 3 and a motor, a fuel tank, a hydraulic oil tank (not shown), which are provided on both the left and right sides of the revolving frame 3 with the vertical plates interposed therebetween. The left and right building covers 4 and 4 accommodated therein, a cab 5 provided on the front side of the right building cover 4, and a counterweight 6 provided on the rear side of each building cover 4 are generally configured. .

Further, the revolving frame 3 is provided with an A-type frame 7 located on the front side of the counterweight 6 and having a guide sheave 7A. Further, the revolving frame 3 is provided with a main winding drum 8, an auxiliary winding drum 9, an undulating drum 10 and the like, which are located between the left and right building covers 4. Further, on the upper surface side of the left and right building covers 4, there are left and right passages 1 through which a worker can pass during maintenance work.
1, 12 are provided so as to extend in the front and rear directions.

Reference numeral 13 denotes a boom as a working device provided on the front side of the upper revolving structure 2 so as to be able to move up and down (raise and lower). The boom 13 has its base end side rotated to the front side of the upper revolving structure 2. A sheave 13A is rotatably provided on the tip side of the sheave 13A.

A backstop 14 is provided between the upper swing body 2 and the boom 13. The backstop 14 is a backstop.
Extends and contracts according to the standing angle of the boom 13 to support the boom 13 from behind.

Reference numeral 15 denotes a main winding rope whose one end side is wound around the main winding drum 8, and the other end side of the main winding rope 15 has a sheave 1
The boom 13 hangs downward from the tip end side of the boom 13 while being wound around 3A. A hook 16 is hung on the other end side of the main winding rope 15 hanging from the tip end side of the boom 13.

Reference numeral 17 denotes a hoisting rope whose one end is wound around the hoisting drum 10. The other end of the hoisting rope 17 is wound between the boom hanger 18 and the boom bridle 19 via the A-shaped frame 7. ing. Further, one end side of the pendant rope 20 is connected to the boom bridle 19, and the other end side of the pendant rope 20 is connected to the tip side of the boom 13.

Reference numeral 21 denotes a first handrail device which is located on the front side of the building cover 4 on the right side and is provided on the upper surface side of the building cover 4. The handrail device 21 is a tubular bracket 22, which will be described later.
The shaft support plate 23, the handrail receiver 25, the handrail 26, the β pin 29, and the like.

Reference numerals 22 and 22 are on the front side of the building cover 4,
A tubular bracket that is provided later and extends upward from the building cover 4, the tubular bracket 22 is formed in a cylindrical shape, and the lower end side thereof is bolted to the building cover 4 of the upper swing body 2 (see FIG. It is fixedly attached via (not shown) or the like. Further, a pin hole 22A into which a β pin 29, which will be described later, is attached is formed on the upper end side of the tubular bracket 22.

Reference numerals 23, 23, ... Depict shaft support plates provided so as to project upward from the upper end side of the tubular bracket 22. The shaft support plates 23 are substantially rectangular flat plates extending in the upward and downward directions. The lower end side thereof is fixed to the tubular bracket 22 so as to face the tubular bracket 22 in the radial direction by welding or the like. In addition, the shaft support plate 2
3 has a shaft hole 23A for mounting a shaft pin 27 described later.

Further, a stopper plate 24 is fixed to the upper end side of each shaft support plate 23, and the stopper plate 24
As described later, when the handrail 26 is rotated upward, the handrail 26 comes into contact with the stopper plate 24, thereby restricting further rotation of the handrail 26.

Reference numeral 25 denotes a handrail receiver provided on the upper end side of the tubular bracket 22. The handrail receiver 25 is obliquely arranged and the lower end side is fixed to the tubular bracket 22 by welding or the like. A plate portion 25A, a lower plate portion 25B arranged obliquely in parallel with the upper plate portion 25A and having a lower end side fixed to the tubular bracket 22 by welding or the like, and a support pipe 26A of a handrail 26 described later. The curved plate portion 25C is formed in a concave curved shape having a diameter substantially equal to the outer diameter and is fixed to the upper end side of the upper plate portion 25A and the upper end side of the lower plate portion 25B.

Further, a pair of pin holes 25D (1) into which a β pin 29 described later is inserted in the curved plate portion 25C of the handrail receiver 25.
Only one is shown). And the handrail receiver 25
When the handrail 26 is rotated downward, the handrail 26 is supported in a folded state with respect to the tubular bracket 22, as shown in FIG.

Reference numeral 26 denotes a handrail rotatably attached to the shaft support plate 23 via a shaft pin 27 which will be described later.
Is a front and rear support pipes 26A, 26A, and a connecting plate 26B that connects the lower end sides of the support pipes 26A to each other.
It is configured by a connecting pipe 26C in which the upper end sides of the support pipes 26A are connected to each other. And the handrail 26
The support pipe 26A is inserted into and inserted into the tubular bracket 22 so as to be removable.

Further, a pair of elongated holes 26D facing upward and downward facing the prop pipe 26A of the handrail 26 in the left and right directions.
(Only one is shown) is provided and each of the elongated holes 26D
A pair of pin holes 26E (only one is shown) are formed on the lower side. Then, the handrail 26 is rotated between a working position that rises upward from the tubular bracket 22 as shown in FIG. 5 and a transportation position that is folded by the handrail receiver 25 as shown in FIG. It is what is done.

Reference numeral 27 is a shaft pin fixedly provided between the shaft support plates 23, and the shaft pin 27 is a long hole 26 of the handrail 26.
Both end sides of the shaft hole 2 of the shaft support plate 23 in the state of being inserted in the D
It is inserted in 3A. Further, the shaft pin 27 is secured to the shaft hole 23A of the shaft support plate 23 by attaching a split pin (not shown) or the like to one end side thereof.

The shaft pin 27 supports the handrail 26 so that it can be folded back through the elongated hole 26D. Further, the support pipe 2 of the handrail 26 is provided on the outer peripheral side of the shaft pin 27.
Annular spacers 28, 28 are provided so as to sandwich 6A, and the spacers 28 prevent rattling of the support pipe 26A of the handrail 26 between the shaft support plates 23.

Reference numeral 29 denotes a β pin as a pin member which is provided in the handrail 26 so that it can be inserted and removed. The β pin 29 is formed as a “β” -shaped pin as shown in FIGS. 8 and 9. There is. The β pin 29 is attached to the tubular bracket 2
When the handrail 26 is inserted into the pin hole 22A of 2 and the pin hole 26E of the handrail 26, the handrail 26 is placed in a working position in which the support pipe 26A rises upward from the inside of the tubular bracket 22, as shown in FIG. .

When the β pin 29 is inserted into the pin hole 25D of the handrail support 25 and the elongated hole 26D of the handrail 26,
The handrail 26 is placed in a transportation position where the support pipe 26A is folded by the handrail receiver 25. Then, at this transportation position, as shown by a chain double-dashed line in FIG.
Is placed at a position lower than an imaginary line AA (see FIG. 3), which is a transportation height that substantially matches the height of the cab 5.

Reference numeral 30 denotes a second handrail device located on the rear side of the handrail device 21 and provided on the building cover 4 on the right side of the upper swing body 2, and 31 denotes a rear handrail device 30. And a third handrail device provided on the right building cover 4. Further, 32 is a fourth handrail device provided on the building cover 4 on the left side of the upper swing body 2, and 33 is the handrail device 32.
No. 5 located on the left side of the building cover 4 located on the rear side of
Handrail device.

Further, 34 is a sixth handrail device located on the rear side of the handrail device 33 and provided on the left building cover 4, and 35 is a rear side of the handrail device 34 and is on the left side. 7 is a seventh handrail device provided on the building cover 4. And, these handrail devices 30, 31, 32, 33, 3
The handrail device 21 is configured to be substantially similar to the handrails 4 and 35, and can be folded between the working position indicated by the solid line and the transportation position indicated by the two-dot chain line in FIG.

The present embodiment has the above-mentioned structure, and its operation will be described below.

First, when performing a hoisting work, by raising the tip end side of the boom 13 to a desired height, the main winding drum 8 is rotated, and the main winding rope 15 is wound and unwound. , Material suspended on the hook 16 (not shown)
Can be transported to a high place.

Further, during the maintenance work, the worker can move the passages 11 and 12 as needed, so that the maintenance work of the entire crawler crane can be smoothly carried out, and the safety of the worker at this time can be improved. It can be secured by the handrail device 21, 30, 31, 32, 33, 34, 35.

At the time of such maintenance work, the β pin 29 is first pulled out from the handrail 26, and the long hole 2
The handrail 26 is inserted into the tubular bracket 22 until the upper end of 6D engages with the shaft pin 27. Then, next, the pin hole 22A of the tubular bracket 22 and the pin hole 26E of the handrail 26 are provided.
By inserting the β pin 29 into the handrail 26, the handrail 26 can be fixed to the tubular bracket 22 as shown in FIG. 5, and the handrail 26 can be held at the working position.

On the other hand, when the crawler crane is transported, β
The pin 29 is pulled out from the pin hole 22A of the tubular bracket 22, and then the handrail 26 is lifted until the lower end of the elongated hole 26D engages with the shaft pin 27. Next, handrail 2 in this state
6 is rotated about the shaft pin 27 so as to be tilted downward, and the support pipe 26A is bent to the curved plate portion 25C of the handrail receiver 25.
Abut inside. Finally, by inserting the β pin 29 into the pin hole 25D of the handrail receiver 25 and the long hole 26D of the handrail 26, respectively, the handrail 26 is fixed in the rotating direction as shown in FIG. The handrail 26 can be held in the transport position.

Thus, in the present embodiment, by folding the handrail 26 to the transportation position during transportation, as shown in FIG. 4, the entire handrail 26 has a prescribed transportation height A.
It can be arranged at a position lower than -A, and as described in the prior art, it is possible to save the labor of removing and installing the handrail from the upper swing body, and it is possible to improve workability during transportation and the like. .

The handrail 26 is attached to the tubular bracket 22.
Since it is configured to be rotatably attached to the shaft support plate 23 located on the upper end side of the handrail via the shaft pin 27, the handrail 26 is turned up and down to move the handrail 26 to the working position. It can be easily moved to the transportation position, and the workability when moving the handrail 26 can be improved.

Further, since the handrail 26 is supported at the working position and the transportation position by using the β pin 29, the handrail 26 is stably fixed in the working position and the transportation position by the β pin 29. The handrail device 21 can be held and held, and the performance and reliability of the handrail device 21 can be improved.

Further, since the stopper plate 24 is attached to the shaft support plate 23 of the handrail device 21, when the handrail 26 is rotated from the transportation position to the working position, the handrail 26 is attached to the stopper plate 24. By making contact with each other, the handrail 26 can be reliably positioned at the work position, and the positioning work of the handrail 26 can be simplified.

Further, since the handrail 26 can be fixed to the handrail receiver 25 by the β pin 29, the handrail 26 can be prevented from rattling in the handrail receiver 25 during transportation, and the handrail 26 can be covered during transportation. It is possible to solve the problem that the upper surface side of 4 is scratched or damaged.

In the above-described embodiment, the crawler type hydraulic crane is used as an example of the construction machine, but the present invention is not limited to this. For example, a wheel type hydraulic crane, a stationary hydraulic crane, a hydraulic excavator, etc. It can be widely applied to various construction machines.

[0046]

As described above in detail, according to the invention of claim 1, a handrail device grasped by an operator is provided in a passage of a vehicle body through which the operator can pass, and the handrail device is operated. Since it is configured to be foldable between the transport position and the transport position, the handrail device is kept below the specified transport height by folding the handrail device from the working position to the transport position when transporting the vehicle body. be able to. As a result, it is possible to save the labor of removing or installing the handrail from the vehicle body as described in the related art, and it is possible to improve workability during transportation and the like.

According to a second aspect of the present invention, the vehicle body is provided with a bracket extending upward from the vehicle body, and the handrail is attached to the upper end side of the bracket so as to be pivotable upward and downward. Therefore, by rotating the handrail on the upper end side of the bracket, the handrail can be easily folded from the working position to the transportation position, and the workability when folding the handrail can be improved.

Further, in the invention of claim 3, the handrail device is provided with a tubular bracket having a lower end side attached to the vehicle body and a pin hole provided on the upper end side, and protruding upward from the upper end side of the tubular bracket. A shaft support plate having a shaft hole formed therein,
A handrail receiver that is located on the side of the shaft support plate and is attached to the tubular bracket and is provided with a pin hole, and an elongated hole is provided on the lower end side and a pin hole is provided below the elongated hole. Handrail, a shaft pin that is inserted into the shaft hole of the shaft support plate and the long hole of the handrail, and supports the handrail so that the handrail can be folded back, a working position where the handrail is erected on a tubular bracket, and the hand. Since it is composed of a pin member that supports the railing at the transportation position folded into the handrail receiver, the handrail is fixed to the working position and the transportation position by using the pin member during maintenance work. It can be held, and the performance and reliability of the handrail device can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a crawler crane according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing an upper swing body in FIG.

FIG. 3 is a partially enlarged view showing an upper revolving structure, a handrail, etc. in FIG. 1 in an enlarged manner.

FIG. 4 is an enlarged view of a handrail and the like as seen from the direction of arrows IV-IV in FIG.

5 is an enlarged view showing the handrail in FIG. 4 in a state in which it is arranged at a work position.

FIG. 6 is a partially enlarged view showing the handrail in FIG. 3 in an enlarged manner.

FIG. 7 is an enlarged view showing the handrail in FIG. 4 in the transport position.

8 is a cross-sectional view as seen from the direction of arrows VIII-VIII in FIG.

9 is a cross-sectional view as seen from the direction of arrow IX-IX in FIG. 7.

[Explanation of symbols]

1 Lower traveling body (car body) 2 Upper revolving structure (vehicle body) 4 Building cover 5 Cab 11, 12 Passage 21, 30, 31, 32, 33, 34, 35 Handrail device 22 Cylindrical bracket 22A, 25D, 26E Pin hole 23 Shaft Support Plate 23A Shaft Hole 25 Handrail Support 26 Handrail 26D Long Hole 27 Shaft Pin 29 β Pin (Pin Member)

Claims (3)

[Claims] 1. A vehicle body having a passage through which a worker can pass, and a working device provided on the vehicle body so as to be able to move up and down. The vehicle body is provided with a worker passing along the passage. In a construction machine provided with a gripping handrail device, the handrail device is provided between a working position in which the handrail device stands up on the vehicle body during work and a transportation position in which the vehicle body is folded on the vehicle body during transportation. A construction machine characterized by being foldable. 2. The handrail device comprises a bracket extending upward from the vehicle body and a handrail attached to an upper end side of the bracket so as to be pivotable upward and downward. Construction machine described in. 3. The handrail device comprises a tubular bracket having a lower end attached to the vehicle body and a pin hole provided at an upper end, and a shaft hole provided so as to project upward from an upper end of the tubular bracket. A shaft support plate provided, a handrail receiver that is located on the side of the shaft support plate and is attached to the tubular bracket and is provided with a pin hole; Also has a handrail with a pin hole on the lower side, a shaft pin that is inserted into the shaft hole of the shaft support plate and the long hole of the handrail, and supports the handrail so that the handrail can be folded back, and the handrail is a tubular bracket. The construction machine according to claim 1, wherein the construction machine comprises a pin member that supports a work position that is set up on a floor and a transportation position where the handrail is folded on a handrail receiver.