JPH1082072A - Construction machinery equipped with sliding ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machinery capable of notifying an operator of a turning position of an upper turning body to an lower turning body when the operator descends from a ladder and making the ladder smoothly lower down to the ground. SOLUTION: A construction machinery equipped with sliding ladder is equipped with a turning angle sensor 7 for detecting a turning angle of an upper turning body 3 to a lower turning body 1. A turning angle indicator 8 is provided to an operation room 4 on the upper turning body 3. Then, the construction machinery equipped with sliding ladder is equipped with the turning angle indicator for indicating whether a ladder 6 can be lowered or not on the basis of an angle detected by the turning angle sensor 7 and a mounting position of the ladder 6 on the upper turning body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine having a sliding ladder for raising and lowering a driver's cab, and more particularly, to a construction machine in which the ladder can be lowered or not depending on the turning position of an upper rotating body. And a structure for smoothly lowering the ladder.

[0002]

2. Description of the Related Art FIGS. 3A and 3B are a side view and a rear view, respectively, showing a large loader shovel. , A driver's cab 4 is installed on the upper swing body 3, and a digging front 5 is attached.

In such a large construction machine such as a large loader shovel, since an operator or the like goes up on the cab 4, a sliding ladder for raising and lowering is usually provided on the left side surface of the upper revolving unit 3 which is on the cab 4 side. 6 is attached.

As shown in FIG. 4, the slide type ladder 6 comprises a guide ladder 6a and a slide ladder 6b which are attached to the upper swing body 3, and the slide ladder 6b slides the guide ladder 6a to raise and lower. It has become. A wire 6c is connected to a lower end of the slide ladder 6b, and the wire 6c is wound around a balancer 6d attached to the upper swing body 3. Then, when the slide ladder 6b is pushed up from the state where the slide ladder 6b is lowered and the wire 6c is wound around the balancer 6d, the slide ladder 6b is pulled up. The slide ladder 6b is lowered by lowering the slide ladder 6b against the balancer 6d. In addition, there is a ladder using an actuator.

[0005]

In a construction machine having such a slide type ladder 6, as shown in FIG. 5, when the upper revolving unit 3 turns, depending on the turning position of the upper revolving unit 3, the lower traveling may occur. Since the body 1 and the slide type ladder 6 interfere with each other, an area NG where the slide ladder 6b (hereinafter simply referred to as a ladder) cannot be lowered occurs. When the operator attempts to descend on the ground at the turning position where the rudder 6b cannot be lowered, the operator descends to the ground using other means other than the slide type rudder 6, or restarts the engine and starts the rudder 6b. It is necessary to turn the upper swing body 3 to a swing position where the
Workability was poor.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a construction machine having a slide type ladder that allows the operator to know what position the upper revolving structure is at relative to the lower traveling structure when the operator descends. Another object of the present invention is to provide a construction machine capable of smoothly lowering a ladder to the ground.

[0007]

According to the present invention, an upper revolving unit is mounted on a lower traveling unit via a revolving device, and a slide type ladder for lifting is mounted on the upper revolving unit. Depending on the turning position, in a construction machine in which the rudder may interfere with the lower traveling structure when the slide type rudder is lowered, a turning angle sensor for detecting a turning angle of the upper revolving structure with respect to the lower traveling structure, Turning angle display means installed in the driver's cab and displaying whether or not the rudder can be lowered from a detection angle detected by the turning angle sensor and a mounting position of the ladder on the upper turning body; (Claim 1).

In the present invention, the turning angle display means includes a display plate for displaying a region where the ladder can be lowered, a region where the ladder cannot be lowered, and an index. The one that displays whether or not the ladder can be lowered by turning in response to the turning angle is adopted (claim 2).

[0009]

According to the first aspect of the present invention, a turning angle display means for displaying whether or not the upper revolving structure is at a position where the rudder can be lowered with respect to the lower traveling structure is provided in the cab. If you are going to descend, you can know in the driver's cab whether the upper revolving structure is in a turning position where the rudder can be lowered, and when it is in a position where it can not be lowered, turn the upper revolving structure to a position where the rudder can be lowered This can prevent a situation where the ladder cannot be lowered.

In the second aspect, the turning position corresponding to the turning of the actual machine is displayed by turning the indicator or the display plate in response to the turning angle, and at the same time, whether or not the rudder can be lowered is displayed. You.

[0011]

FIG. 1 is a plan view showing one embodiment of a construction machine according to the present invention. Reference numeral 7 denotes a turning angle sensor provided in a turning device 2 and reference numeral 8 denotes a turning angle display means installed in a cab 4. It is. The turning angle sensor 7 is constituted by a potentiometer or a rotary encoder, and outputs an electric signal corresponding to a turning angle of the upper revolving unit 3 with respect to the lower traveling unit 1. The turning angle display means 8 displays whether or not the rudder can be lowered based on a signal from the turning angle sensor 7 and information on the mounting position of the rudder 6 on the upper turning body 3 which is given in advance. For example, a meter type as shown in FIG. 2 is employed.

In FIG. 2, the turning angle display means 8 comprises a display plate 9 and an index 10, and the display plate 9 has a hatched area where the rudder can be lowered over the entire 360-degree turning range. NG and an area OK indicated by a blank where ladder unloading is impossible are displayed in correspondence with the actual machine. In FIG. 2, reference numerals g to n correspond to reference numerals g to n in FIG.

According to the turning angle display means 8, the indicator 10 turns with respect to the display plate 9 in response to the turning angle detected by the turning angle sensor 7, whereby the rudder can be lowered. In order to indicate whether the area is OK or impossible NG, the operator can recognize at a glance whether the ladder can be lowered by looking at the position indicated by the index 10. .
When the rudder is at a position where it cannot be lowered, the operator changes the turning position of the upper rotating body 3 by driving the turning device 2 so that the rudder 6 can be lowered so as not to interfere with the lower traveling structure 1. .

As described above, the configuration is such that the operator can recognize whether or not the ladder can be lowered in the driver's cab, so that when the operator descends from the upper revolving unit 3, the operator must be in a position where the ladder can be lowered. It is possible to set the orientation of the upper revolving unit 3 so that the rudder cannot be lowered, using another means, or the operator returns to the driver's cab and starts the engine again to start the upper revolving unit 3.
It is possible to use the ladder 6 without fail and turn down quickly and quickly, thereby improving workability.

In the above example, the index 10 is rotated with respect to the display plate 9, but the display plate 9 is
You may comprise so that it may rotate with respect to zero. Also, CR
The index may move on a display screen such as T.

The present invention is applicable not only to large construction machines such as loader shovels and hydraulic excavators but also to other large construction machines such as cranes and shaft excavators.

[0017]

According to the present invention, in a construction machine having a slide type rudder, a turning angle sensor for detecting a turning angle of an upper revolving unit with respect to a lower traveling unit, and a cab mounted on the upper revolving unit in a cab, Since there is provided turning angle display means for displaying whether or not the ladder can be lowered from the detection angle detected by the turning angle sensor and the mounting position of the ladder on the upper turning body, the operator descends. At that time,
By allowing the operator to know in the cab whether the rudder can be lowered and immediately turning it to a position where the rudder can be lowered if necessary,
Since the ladder can be smoothly lowered on the ground, when the operator descends from the upper revolving structure, the operator can descend with certainty and quick operation using the rudder, thereby improving workability.

According to the second aspect, it is possible to recognize at a glance whether or not the ladder can be lowered by the relative rotation position between the display plate and the index.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a construction machine according to the present invention.

FIG. 2 is a diagram showing an example of a turning angle display means according to the present invention.

FIGS. 3A and 3B are a side view and a rear view, respectively, of a loader shovel as an example of a construction machine to which the present invention is applied.

FIG. 4 is a rear view showing the configuration of the ladder of FIG. 3;

FIG. 5 is a plan view showing a relationship between a turning position of an upper turning body and a position where a rudder can be lowered and cannot be lowered in the construction machine of FIG. 3;

[Explanation of symbols]

1: Lower traveling structure, 2: Revolving device, 3: Upper revolving structure, 4:
Operator's cab, 5: Excavation front, 6: Sliding ladder,
7: turning angle sensor, 8: turning angle display means, 9: display plate, 10: index

Claims (2)

[Claims] 1. An upper revolving structure is mounted on a lower traveling structure via a revolving device, and a slide ladder for elevating is mounted on the upper revolving structure. Depending on a turning position of the upper revolving structure, a slide type rudder is provided. In a construction machine in which the rudder may interfere with the lower traveling structure when the vehicle is lowered, a rotation angle sensor for detecting a rotation angle of the upper revolving structure with respect to the lower traveling structure; A sliding angle display means for displaying whether or not the ladder can be lowered from a detection angle detected by the angle sensor and a mounting position of the ladder on the upper revolving structure; Construction machinery with a ladder. 2. The method according to claim 1, wherein the turning angle display means includes an area in which a rudder can be lowered.
It consists of a display plate indicating an area where the ladder cannot be lowered, and an index, and the index or the display plate rotates in response to the turning angle to determine whether the ladder can be lowered. A construction machine having a sliding ladder characterized by being displayed.