JP2710891B2 - Excavator rope replacement alarm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for preventing a rope from being cut due to fatigue due to the elapse of an operation period in an excavator having a compression device .

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional multi-stage telescopic arm using a rope (disclosed in Japanese Patent Publication No. 63-47849) in an excavator. The hydraulic excavator body 1 is raised and lowered by a boom cylinder 2. An extensible arm 5 is attached to the tip of the freely attached boom 3 so as to be vertically rotatable by an arm cylinder 4, and a clamshell bucket 6 is attached to the tip of the extensible arm 5.

FIG. 6 is a sectional view showing the structure of the telescopic arm 5. The telescopic arm 5 includes a base arm 7, an intermediate arm 8,
And the tip arm 9 is telescopically combined. A pair of fixed sheaves 11, 1
2 (a plurality of these sheaves 11 and 12 are provided) are spaced apart, and a bracket 15 having a pair of movable sheaves 13 and 14 attached between the fixed sheaves 11 and 12 is provided.
Along the base arm 7 by means of a hydraulic cylinder 16 via a roller 17 (note that a guide for the roller 17 is provided on the outer peripheral surface of the base arm 7 in the longitudinal direction, but is not shown). Movable fixed sheave 11 (12)
Rope 18 hung between the movable sheave 13 (14)
(19) is connected to the intermediate arm 8 via sheaves 20 and 21 at the lower and upper ends of the base arm 7, respectively, and the intermediate arm 8 and the distal arm 9 are extended and contracted in conjunction with each other.
Sheaves 23, 24 are attached to the upper and lower ends of the intermediate arm 8, and ropes 25, 26 having one end connected to the lower end of the proximal arm 7 and the other end connected to the upper end of the distal arm 9 are connected to these sheaves 23, 24. Each is hung.

[0004] This multi-stage telescopic arm, when excavating,
By raising (lowering) the bracket 15 by the extension of the hydraulic cylinder 16, the ropes 18, 26 (19,
25), the intermediate arm 8 and the distal arm 9 are pulled down (pulled up). During excavation, a sufficient pressing force of the bucket 6 against the excavated ground is obtained due to the extension of the hydraulic cylinder 16, so that even the hard ground can be efficiently operated. Can excavate well.

In such a multi-stage telescopic arm, the ropes 18, 19, 25, and 26 may be cut due to fatigue due to the elapse of the operation time. When the time reached a certain time, the rope was changed for safety.

[0006]

As described above, conventionally, the excavator is replaced when the operating time of the excavator reaches a predetermined time. However, the excavator is used on the rope depending on various use conditions (excavation and loading, etc.). The burden is different. That is, in the loading operation, the telescopic arm 5 is frequently expanded and contracted, so that the fatigue of the rope progresses. In the excavation operation, the frequency of expanding and contracting the telescopic arm 5 is low. Therefore, conventionally, the rope is used on the safe side, and the rope use limit time is set assuming the loading condition, which is the work condition with the largest load, and therefore, the machine mainly used for excavation work with a small load on the rope Then, there was a problem that the performance of the rope could not be used to the maximum. In addition, the rope is to be replaced after a certain period of time. However, since the rope was forgotten to be replaced, the rope could be cut, leading to an accident.

[0007] The present invention has been made in view of such problems, and an object of the present invention is to provide a rope replacement time that is accurate according to the degree of rope fatigue, thereby maximizing the performance of the rope. It is an object of the present invention to provide a rope exchanging alarm device of an excavator, which can be used for the excavator and which can reliably exchange ropes and improve safety.

[0008]

SUMMARY OF THE INVENTION The present invention takes into account that the fatigue of a rope such as a wire rope currently on the market is determined by the number of bendings, and detects the fatigue of the rope as the number of rotations of a sheave by which the fatigue is applied. Is what you do. That is, the present invention provides an excavating work having a multi-stage telescopic device using a rope.
In the industrial machine , a rotation detector that counts the number of rotations of the sheave on which the rope is hung, and a counter that integrates the number of rotations of the sheave from the output of the rotation detector, and that holds the integrated value even when the excavator is stopped. A counter for resetting the integrated value provided in the counter, and an alarm device for issuing an alarm when the integrated value exceeds a set value.

[0009]

Since the device of the present invention has the above-described structure, the degree of fatigue of the rope is detected as the number of revolutions of the sheave to be applied thereto, and when the set time is reached, a warning is issued to the driver by a warning device.

[0010]

FIG. 1 is a block diagram showing an embodiment of a rope exchanging warning device for an excavating machine according to the present invention, which is an excavating machine using a clamshell bucket described with reference to FIGS. 5 and 6. FIG. FIG. 3 is an external view of a main body portion installed in a cab of the alarm device of the example, and FIG. 3 is a block diagram showing an internal configuration thereof.

In FIG. 1, reference numeral 12 denotes a fixed sheave shown in FIGS. 5 and 6. The fixed sheave 12 is a pair of shaft support plates fixed to the outer surface of the base arm 7 (only one side is shown). 30), the shaft 31 is supported on the shaft 31 and an arbitrary number of the shafts 31 are rotatably mounted on the shaft 31. As described above, the rope 19 is wound around the movable sheave 14 which moves by the expansion and contraction of the hydraulic cylinder 16. Is done. Therefore, the fixed sheave 1
The rotation of 2 corresponds to the expansion and contraction of the telescopic arm 5.

Reference numeral 32 denotes a rotation detector for detecting the sheave rotation speed. In this embodiment, the sheave (rope 19) having the highest rotation speed among the plurality of fixed sheaves 12 is provided.
The shaft support plate 30 is attached to the shaft support plate 30 with a bracket 33 and bolts 34 so as to detect the rotation speed of the sheave (directly connected to the sheave 21 via the sheave 21). The rotation detector 3
2 is a fixed sheave 11 on which the rope 18 is hung, or a sheave 21 at the upper end of the base arm 7 or a sheave 20 at the lower end.
It may be attached to. On the side surface of the fixed sheave 12, an object 33 to be detected is provided which is detected by electromagnetic or optical means according to the detection method of the rotation detector 32.

Reference numeral 36 denotes an operator's cab of the excavator, reference numeral 37 denotes an alarm device main body installed in the operator cab 36, and the rotation detector 32 is connected to the alarm device main body 37 via a cable 38. .

As shown in the external view of FIG. 2, the alarm device main body 37 includes a counter 43 having a display section 42 of an integrated rotation speed on a front panel 41 of a box 40, and an alarm lamp (a lamp which emits an alarm as a sound). And a pilot lamp 4 for indicating power-on.
And 5.

As shown in FIG. 3, an output signal of the rotation detector 32 is applied to the counter 43 via the cable 38, the number of rotations of the fixed sheave 12 is integrated in the counter 43, and a display section is provided. At 42, the integrated value is displayed. The counter 43 has a function of retaining the integrated value even when the excavator is at rest. For example, the counter 43 can be used while exchanging the attachment such as the telescopic arm 5 and using it for another purpose. Is used.

The counter 43 has an integrated value reset means 46 and a sheave rotation number setting means 47. The comparator 48 compares the integrated value of the counter 43 with the sheave rotation number set by the setting means 47. When the integrated value exceeds the set sheave rotation speed, the alarm lamp 44 is turned on.

According to this configuration, when the fixed sheave 12 rotates due to the expansion and contraction of the hydraulic cylinder 16, the rotation detector 32
The operation of the counter 43 accumulates the rotation speed of the fixed sheave 12. Even if the operation is interrupted, the integrated value is held by the counter 43, and the number of rotations of the fixed sheave 12 is further integrated in the next operation. When the integrated value exceeds the set sheave rotation speed, the alarm lamp 4
4 lights up and ropes 19 and 18 are given to the driver or operator.
(Whether or not to replace the other ropes 25 and 26 depends on whether the fixed sheaves 11 and 12 and the movable sheave 1
3 and 14). After replacing the ropes 18 and 19, reset means 4
6, the integrated value of the counter 43 is reset.

The set sheave speed set by the setting means 47 is preferably set in consideration of the fact that the load on the rope varies depending on the use conditions such as excavation or loading.

As shown in this embodiment, by setting the sheave rotation speed so that it can be changed, the set sheave rotation speed can be changed according to the type of rope. Are more convenient for practical use. Also, as shown in the present embodiment, if the integrated value of the counter is displayed, if the rotation speed of the sheave in one stroke of the telescopic arm is out of order, it is known that the rope is extended or broken. be able to.

The above description is made by taking an example of the telescopic arm 5 used in the excavator using the clamshell bucket 6 (the one that uses the power of the actuator such as the hydraulic cylinder 16 in both the arm extending direction and the contracting direction). However, the present invention relates to a multi-stage telescopic button of the earth drill shown in FIG.
(The power of the winch 52 is used only when the rope 54 is contracted, and the extension of the kelly bar 55 is performed by the weight of the earth drill bucket 62 and the telescopic arm 55)
It can be used as a warning device for rope replacement. That is, in this earth drill, as shown in FIG. 4A, a rope 54 wound and fed by a winch 52 installed on a main body 50 hangs down from a top sheave 53 at the top of the boom 51. Figure 4
(B), the formed of square tubular outer rod 58, the connecting via a swivel joint 57 to the inner rod 56 of the center rod 59 and the inner rod 56 Keriba 55 consisting fitted telescopically to Keriba 55
And an earth drill bucket 62 is attached to the lower end of the inner rod 56. The kelly bar 55 is a corner of a rotary driving plate of a kerry bar driving device 61 installed on a front frame 60 attached to a front portion of the main body 50. It penetrates the hole up and down freely.

In this earth drill, as shown in FIG. 4C, the rotation detector 32 is attached to the bracket 63 to which the top sheave 53 is attached so as to face the side surface of the top sheave 53, and the top sheave is provided. 53
The detection object 33 is provided on the side surface of the alarm device, and as shown in FIG.
As described with reference to FIG. 3, the counter 43 of the alarm device main body 37 is connected to the rotation detector 32 via the cable 38, and the accumulated number of revolutions of the top sheave 53 is displayed on the counter 43, and the accumulated number of revolutions is set. When the value is reached, an alarm is issued by the alarm 44. In this earth drill, the sheave on which the rotation detector 32 is mounted may be any sheave on which the rope 54 can be hung, and is not limited to the top sheave 53.

[0022]

As described above, according to the present invention,
It detects the rotation speed of the sheave on which the rope is hung, and issues an alarm when the rotation speed reaches the set value.
Compared to the conventional case where the rope replacement time is set based on the usage time of the excavator, the degree of fatigue of the rope is accurately grasped, the rope replacement time is accurate, and, due to this, Accidents can be prevented and safety is improved.

Further, since the rope replacement time corresponds to the rope fatigue, the waste time is reduced as compared with the conventional case where the rope use limit time is set shorter in consideration of safety as in the related art.

In addition, since an alarm is issued when the sheave rotation speed reaches a predetermined value, it is possible to avoid forgetting to replace the rope, thereby improving safety. In addition, the driver does not need to worry about the rope usage time. There is a practical effect that work can be performed with a sense of security and anxiety is eliminated.

There are various modes for carrying out the present invention, which can be implemented at low cost by using a commercially available device.

[Brief description of the drawings]

1 is a block diagram showing an embodiment shown on the clamshell bucket use of excavating working machine rope replacement alarm system excavating working machine according to the present invention.

FIG. 2 is an external view of a main body portion installed in a cab of the alarm device of the embodiment.

FIG. 3 is a block diagram showing an internal configuration of the embodiment.

FIG. 4A is a side view of an earth drill as another application example of the rope replacement alarm device of the excavator according to the present invention;
(B) is a vertical cross-sectional view of the kerry bar , and (C) is an enlarged side view of the main part.

FIG. 5 is a side view of an excavating work machine showing an example of use of a conventional telescopic arm.

FIG. 6 is a longitudinal sectional view of the telescopic arm of FIG. 5;

[Explanation of symbols]

5 Telescopic Arm 7 Base Arm 12 Fixed Sheave 19 Rope 32 Rotation Detector 33 Detected Object 36 Operator's Cab 37 Alarm Main Body 42 Display 43 Counter 44 Alarm Lamp 52 Winch 54 Rope 55 Multi-stage Telescopic Kelly Bar 57 Swivel Joint

Claims (1)

(57) [Claims] An excavator having a multi-stage telescopic device using a rope.
In the working machine , a rotation detector that counts the number of rotations of the sheave on which the rope is hung, a counter that integrates the number of rotations of the sheave from the output of the rotation detector, and that holds the integrated value even when the excavator is stopped. A resetting means for resetting the integrated value provided in the counter, and an alarm which issues an alarm when the integrated value exceeds a set value.