JPH10157977A - Rope hoisting equipment for construction machinery - Google Patents

Abstract

(57) [Problem] To provide a rope hoisting device for a construction machine in which one rope is hoisted up and down by two drums.
Reduce the burden on the operator who operates the drum. A limit switch is provided at a position where it is possible to detect that the remaining winding amount of the rope 6 on the front and rear drums 2 and 3 is three, and at a position where it is possible to detect that the number of winding layers of the rope is three. 10A, 10B, 11A, and 11B are provided, respectively. When either of the limit switches 10A, 10B detects that the remaining winding amount of the rope 6 has become three turns, an alarm is issued from a buzzer to notify the operator. Conversely, when any of the limit switches 11A and 11B detects that the winding layer of the rope 6 has become three layers, a buzzer issues an alarm and notifies the operator. This eliminates the need for the operator to observe the winding state of the ropes 6 of the drums 2 and 3, thereby reducing the burden.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope hoisting device for a construction machine, which is used for a construction machine such as an excavator for performing a continuous wall construction method and winds or unwinds one rope by two drums.

[0002]

2. Description of the Related Art A continuous wall excavator for performing a continuous wall construction method uses an excavation attachment that is lowered at a very low speed. The depth tends to be larger. In order to increase the excavation depth, for example, as shown in FIG. 11, one rope 46 is wound around two drums 42 and 43 to secure the rope length. That is, one end of the rope 46 is connected to one of the drums 42, and the other end of the rope 46 is connected to the other drum 43, and the ropes 46 are wound on the drums 42, 43 in advance, so that the drums 42, 43 can be used alone. In this case, the rope length can be twice as long as that in the case of using the rope.

In such an excavator, since it is necessary to lower the suspended load suspended on the rope at a very low speed, the operation is performed by operating only one of the drums. That is, one of the drums is operated at a low speed, and after the rope of one of the drums has been completely drawn out, the rope is drawn out of the other drum to lower the suspended load. On the other hand, when winding the rope, there are a case where the rope is wound at a very low speed and a case where the rope is wound at a high speed. That is, in the case of winding at a very low speed, as in the case of unwinding the rope, the rope is wound up by operating the other drum and then the rope is wound up by operating the other drum. Operate two drums simultaneously to wind up the rope.

[0004]

However, in a construction machine in which a rope is wound by two drums as described above, the remaining amount of the rope when the rope is unreeled and the predetermined amount of the rope when the rope is wound are determined. There is a need for constant monitoring to ensure that there are no more layers. For this reason, the operator must constantly pay attention to the rope winding amount of the drum both at the time of winding the rope and at the time of feeding the rope, which places a heavy burden on the operator.

An object of the present invention is to provide a rope hoisting device for a construction machine, which can reduce the burden on an operator.

[0006]

FIG. 2 shows an embodiment of the present invention.
With reference to FIG. 5 and FIG.
The ends of one rope 6 are connected and wound around two drums 2 and 3 rotatable in the forward and reverse directions, respectively, and the two drums 2 and 3 are respectively rotated in the forward and reverse directions to wind up the rope 6 or Detecting means 10A, 10B, 11 that are applied to a rope hoisting device of a construction machine that unwinds and that detects a predetermined remaining amount when the rope 6 of each of the drums 2 and 3 is unwound and a predetermined number of winding layers when the rope 6 is wound.
A, 11B and detecting means 10A, 10B, 11A, 11
The above object is achieved by providing the output means 19 for outputting the detection result of B.

[0007] In the invention of claim 2, the detecting means includes:
A first switch 10A, which is provided in the vicinity of the feeding end of the rope 6 of each of the drums 2 and 3 and in the vicinity of the end of a predetermined number of winding layers, and is turned on when the number of rope windings is equal to or less than a predetermined value.
10B, and second switches 11A and 11B that turn on the rope winding layer at a predetermined value or more. Referring to FIG. 6, according to the third aspect of the present invention, the detecting means comprises:
Each of the drums 2 and 3 includes detectors 20 and 21 provided at at least one of the vicinity of the feeding end of the rope 6 and the end of the predetermined number of winding layers, and outputs signals corresponding to the winding layers and the number of windings of the rope. Is done. Referring to FIG. 10, according to the fourth aspect of the present invention, the detecting means comprises a rope 6
And rope length detecting means 30 and 31 for detecting the feeding amount and the winding amount. In the invention according to claim 5, the output means is the means 19 for issuing an alarm based on the detection result. In the invention according to claim 6, the output means includes:
This is means for stopping the rotation of each of the drums 2 and 3 based on the detection result.

According to the first aspect of the present invention, the detecting means 10
A, 10B, 11A, and 11B detect a predetermined remaining amount of the rope 6 at the time of pulling out the rope and a predetermined number of rope winding layers at the time of winding the rope. The detection results of the detection means 10A, 10B, 11A, 11B are output by the output means 19. According to the invention of claim 2,
The first switches 10A and 10B provided near the rope feeding ends of the drums 2 and 3 detect a predetermined remaining amount of the rope 6 at the time of feeding the rope, and are provided near the ends where the predetermined number of winding layers is reached. Second switch 11A, 11
The predetermined winding number of the rope 6 is detected by B. According to the third aspect of the present invention, the predetermined remaining amount of the rope 6 at the time of feeding the rope is detected by the sensors 20 and 21 provided near the rope feeding ends of the drums 2 and 3, and the end of the predetermined number of winding layers is obtained. Sensors 20 and 21 provided near the part
Thus, the predetermined number of winding layers of the rope 6 is detected. In addition, depending on the number of winding layers, the sensor 22 and the sensor 22 are provided in the vicinity of the rope feed-out end or in the vicinity of the end having a predetermined number of winding layers.
By providing 23, a predetermined remaining amount of the rope 6 and a predetermined number of winding layers are detected.

According to the fourth aspect of the present invention, the predetermined length of the rope 6 and the predetermined number of winding layers are detected by detecting the amount of the rope 6 fed and wound by the rope length detecting means 30 and 31. Is done. According to the invention of claim 5, when the rope 6 reaches a predetermined remaining amount or a predetermined number of winding layers, an alarm is issued from the output means 19. According to the invention of claim 6, when the rope 6 has a predetermined remaining amount or a predetermined number of winding layers, the rotation of the drums 2 and 3 is stopped.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used for easy understanding of the present invention. However, the present invention is not limited to this.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

-First Embodiment- An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the configuration of the excavator body according to the embodiment of the present invention. As shown in FIG. 1, a boom 8 is attached to the front of the excavator body 1 according to the present embodiment so as to be able to undulate. The main body 1 is provided with two drums 2 and 3 (a front drum 2 and a rear drum 3) for winding or unwinding one rope 6, and the front drum 2 is provided with a rope 6a side and a rear drum 6a. The rope 3 is wound around the rope 6b. The rope 6 is hung around the point sheave 9 at the tip of the boom 8 and the sheave 5 is hung around. Then, the excavation attachment 4 is attached to the sheave 5.

FIG. 2 is a schematic diagram showing details of the winding state of the rope in the present embodiment. As shown in FIG. 2, the end of the rope 6 on the 6a side is wound around the front drum 2 to a predetermined specified winding layer. The end of the rope 6 on the 6b side is
It is wound four times around the point sheave 9 and the sheave 5 of the boom 8, and the end on the 6b side is wound around the rear drum 3 to a predetermined prescribed winding layer. The number of windings of the rope 6 between the sheave 5 and the point sheave 9 is not limited to four, and may be two or six. Limit switches 10A and 10B are provided in the vicinity of the rope attachment ends of the front drum 2 and the rear drum 3 to detect that the remaining winding amount of the rope 6 is, for example, three turns. On the other hand, limit switches 11A and 11B for detecting that the number of winding layers of the rope 6 is, for example, three are provided near the ends of the front drum 2 and the rear drum 3 opposite to the rope mounting ends. I have. The limit switches 10A and 10B are connected to the rope 6 as shown in FIG.
Rollers 13A and 13B when the winding amount of
Are turned on by contacting the front and rear drums 2 and 3.
On the other hand, the limit switches 11A and 11B are turned on when the roller portions 14A and 14B rise up when the number of winding layers of the rope 6 becomes three as shown in FIG. In this embodiment, an alarm is issued when these limit switches 10A, 10B, 11A, 11B are turned on.

FIG. 5 is a circuit diagram of the present embodiment. FIG.
As shown in the figure, the limit switches 10A, 10B, 11
Reference numerals A and 11B denote operating levers 16 for operating actuators (not shown) for rotating the front drums 2 and 3, respectively.
The lower switch SW1, which is closed by the lower operation of the switch 17,
SW3 and an up-side switch SW2 which is closed by an up-side operation.
SW4 connected in series with the limit switch 10A, 1
0B, 11A, 11B and lower switches SW1, SW3
Alternatively, each series circuit with the up switches SW2 and SW4 is a buzzer 19 and a power supply 1 for driving the buzzer 19.
8 in series.

Next, the operation of this embodiment will be described. First, the case where the rope 6 is extended will be described.
When the rope 6 is extended, the operation lever 16 is switched to the lower side to drive the actuator to drive the front drum 2 in the direction in which the rope 6 is extended. As a result, the rope 6 is extended and the excavation attachment 4 is lowered. When the winding of the rope 6 is continued and the winding amount of the rope 6 on the front drum 2 becomes the remaining three windings, the roller 13A of the limit switch 10A comes into contact with the front drum 2 as shown by the broken line in FIG. The switch 10A turns on and closes. At this time, since the lowering switch SW1 is turned on and closed by the lowering operation of the operation lever 16, the buzzer 19
Is energized and an alarm is issued.

The operator is notified of the operation lever 1 by this alarm.
6 can be returned to the neutral position and the operation can be stopped. On the other hand, if the rope 6 needs to be further extended, the operation lever 17 is switched to the lower side to move the rear drum 3 to the rope 6.
In the direction in which Thereby, the rope 6 is extended and the excavation attachment 4 is further lowered. When the rope 6 continues to be fed out and the winding amount of the rope 6 on the rear drum 3 reaches the remaining three windings, the roller 13B of the limit switch 10B comes into contact with the rear drum 3 as shown by the broken line in FIG. The switch 10B turns on and closes. At this time, since the lowering switch SW3 is turned on and closed by the lowering operation of the operation lever 17, the buzzer 19 is closed.
Is energized and an alarm is issued. The operator switches the operation lever 17 to the neutral position in response to the alarm and ends the operation.

On the other hand, when the rope 6 is to be wound, the operation lever 16 is switched to the up side to drive the actuator to drive the front drum 2 in the direction in which the rope 6 is wound. Thereby, the rope 6 is wound up and the excavation attachment 4 is raised. When the winding of the rope 6 continues and the winding layer of the front drum 2 becomes three layers, the roller 14A of the limit switch 11A rises as shown by a broken line in FIG. At this time, since the raising switch SW2 is turned on and closed by the raising operation of the operation lever 16, the buzzer 19 is energized and an alarm is issued.

The operator issues an operation lever 1 by this alarm.
6 can be returned to the neutral position and the operation stopped. If the rope 6 needs to be further wound, the operation lever 17 is switched upward to drive the rear drum 3 in a direction in which the rope 6 is wound. Thereby, the rope 6 is wound up and the excavation attachment 4 is further raised. When the winding of the rope 6 is continued and the winding layer of the rear drum 3 becomes three layers, the limit switch 11 is moved as shown by a broken line in FIG.
The roller 14B of B rises and the limit switch 11B turns on and closes. At this time, since the raising switch SW4 is turned on and closed by the raising operation of the operation lever 17, the buzzer 19 is energized and an alarm is issued. The operator switches the operation lever 17 to the neutral position in response to the alarm, and ends the operation of winding the rope 6.

As described above, in the first embodiment, an alarm is issued when the remaining winding amount of the rope 6 on the front and rear drums 2 and 3 becomes three turns or when the winding layer of the rope 6 becomes three layers. Is issued, the operator can know from this alarm that the winding amount of the rope 6 is small and that the number of winding layers has reached the specified number. Therefore, it is not necessary to pay attention to the winding amount of the rope 6 of the front and rear drums 2 and 3 during the operation, so that the burden on the operator can be reduced.

-Second Embodiment- Next, a second embodiment of the present invention will be described.
In the first embodiment, the limit switch 10 is used to detect the remaining amount of winding of the rope 6 and the winding layer.
A, 10B, 11A and 11B were used, but as shown in FIG. 6, the potentiometers 20 and 21 whose output voltage changes according to the size of the winding layer are directed to the vicinity of the rope winding ends of the front and rear drums 2 and 3, respectively. You may. In the second embodiment, an alarm is issued when the number of winding layers of the rope 6 becomes five, unlike the first embodiment.
FIG. 7 is a circuit diagram of the second embodiment. As shown in FIG. 7, in the second embodiment, the potentiometers 20 and 21, the up switches SW1 and SW3 that are turned on by the up operation of the operation levers 16 and 17, and the down switch SW2 that is turned on by the down operation. , SW4 and buzzer 19 are connected to CPU22. The output of the potentiometers 20 and 21 becomes minimum when the remaining winding amount of the rope 6 wound around the front and rear drums 2 and 3 becomes three turns, and the winding layer of the rope 6 is the fourth winding of the fifth layer. The output is the maximum when it reaches the eye.

Next, the operation of the second embodiment will be described. FIG. 8 is a flowchart showing the operation of the second embodiment. First, in step S1, the determination of the operation direction of the operation levers 16 and 17 is made by the switches SW1 to SW
4 is performed by a signal. When the operation lever 16 is operated downward, it is determined that the rope 6 has been extended from the front drum 2 and the process proceeds to step S2, where it is determined whether or not the output of the potentiometer 20 is minimum. When the operation lever 16 is operated upward, the front drum 2
In step S3, it is assumed that the rope 6 has been wound.
Then, it is determined whether or not the output of the potentiometer 20 is maximum. When the operation lever 17 is operated downward, it is assumed that the rope 6 has been extended from the rear drum 3 and the process proceeds to step S4, where the potentiometer 21 is operated.
It is determined whether or not the output is minimum. Operation lever 1
When 7 is operated upward, it is assumed that the rope 6 is wound around the rear drum 3 and the process proceeds to step S5.
It is determined whether the output of potentiometer 21 is at a maximum.

If step S2 is denied, the processing is terminated because the rope 6 of the front drum 2 has not been advanced to the remaining three windings. Conversely, if step S2 is affirmed, the buzzer 19 is turned on and an alarm is issued in step S6 assuming that the winding amount of the rope 6 of the front drum 2 has become three turns. Then, in step S7, it is determined whether or not the operation lever 16 (17) is in the neutral state, and steps S6, S7 are performed until step S7 is affirmed.
Is repeated. If step S7 is affirmed,
In step S8, the buzzer 19 is turned off and the process ends.

On the other hand, if step S3 is denied,
Since the rope 6 of the front drum 2 has not been wound up to the fifth layer, the process ends, and if the result in step S3 is affirmative,
Steps S6 to S8 are repeated. Also,
If step S4 is denied, the process is terminated because the rope 6 of the rear drum 3 has not been advanced to the remaining three windings. If step S4 is affirmed, step S6
To Step S8 are repeated. Step S5
Is negative, the rope 6 of the rear drum 3 has not been wound up to the fifth layer, so the processing is terminated, and step S5
If affirmative, steps S6 to S8 are repeated.

On the other hand, when it is determined in step S1 that both of the operation levers 16 and 17 are operated downward, in step S9, the potentiometer 2 is operated.
It is determined whether one of 0 and 21 is the minimum output.
If step S9 is denied, the process ends, and if step S9 is affirmed, steps S6 to S
8 is performed. If it is determined in step S1 that both of the operation levers 16 and 17 have been operated upward, it is determined in step S10 whether one of the potentiometers 20 and 21 has the maximum output. If step S10 is denied, the process ends,
When step S10 is affirmed, the processing of steps S6 to S8 is performed.

As described above, in the second embodiment, the remaining winding amount of the rope 6 on the front and rear drums 2 and 3 becomes three turns, or the winding layer of the rope 6 becomes five layers,
In addition, since an alarm is issued when the fourth winding is reached, the operator can know from this alarm that the winding amount of the rope 6 is small and that the number of winding layers has reached the specified number. Therefore, it is not necessary to pay attention to the winding amount of the rope 6 of the front and rear drums 2 and 3 during the operation, so that the burden on the operator can be reduced.

In the second embodiment, the remaining amount of the rope 6 wound around the potentiometers 20 and 21 on the front and rear drums 2 and 3 becomes three turns, and the rope winding layer becomes the fifth layer. Although it is arranged at a position where it is possible to detect that it has become an odd-numbered winding layer, the maximum predetermined winding amount of the rope 6 is three layers, and it is detected that the rope is a fourth layer, that is, an even-numbered winding layer. If it is necessary, it is not possible to provide only one potentiometer 20, 21 as shown in FIG. Therefore, as shown in FIG. 9, potentiometers 22 and 23 for detecting that the rope winding layer has become the fourth layer are provided near the end different from the end where the potentiometers 20 and 21 are provided. It is necessary to use the potentiometers 22 and 23 to detect that the winding layer of the rope 6 has reached the fourth layer.

Third Embodiment Next, a third embodiment of the present invention will be described.
In the first and second embodiments, the winding amount of the rope 6 on the front and rear drums 2, 3 is detected by the limit switches 10A, 10B, 11A, 11B or the potentiometers 20, 21, 22, 23. However, as shown in FIG. 10, a rotary encoder 3 is attached to a point sheave 9 provided at the tip of the boom 8.
0, 31 are provided, each of the rotary encoders 30, 31 detects the length of the rope 6 wound or unwound by the front and rear drums 2, 3, and detects the remaining winding amount of the rope 6 on the front and rear drums 2, 3, and The winding layer may be detected.

That is, when the number of pulses from the position where the rope 6 is most extended to the position where the rope 6 is most wound is detected in advance by the rotary encoders 30 and 31, and the excavation attachment 4 is lowered, the rope 6 is The number of pulses from the winding position may be counted, and the number of pulses may be used to detect that the rope 6 has reached the most extended state. Conversely, when the excavation attachment 4 is raised, the number of pulses from the position where the rope 6 is most extended is counted, and if the number of pulses detects that the rope 6 has become the most wound state. Good.

In the above embodiment, an alarm is issued by the buzzer 19, but when the rope 6 reaches a predetermined remaining winding amount or a predetermined winding amount, the front and rear drums 2 and 3 are moved. The operation of the actuator to be driven may be stopped, and the winding or unwinding of the rope 6 may be stopped.

In the correspondence between the above-described embodiment and the claims, the front and rear drums 2 and 3 connect the drums with the limit switch 1.
0A, 10B, 11A, 11B and potentiometers 20, 21 constitute detection means, and the buzzer 19 constitutes output means.

[0030]

As described in detail above, claims 1 to 5
According to the fourth aspect of the present invention, the predetermined remaining amount of each drum when the rope is unreeled and the predetermined number of winding layers at the time of winding are detected by the detecting means. Has reached the predetermined number of winding layers,
This eliminates the need to pay attention to the drum during the operation, and can reduce the burden on the operator. Claim 5
According to the invention of the above, an alarm is issued when the detection means detects the predetermined remaining amount at the time of rope feeding of each drum and the predetermined number of winding layers at the time of winding,
The operator can know the winding state of the rope on the drum from the alarm. According to the invention of claim 6, when the detection means detects the predetermined remaining amount at the time of rope feeding of each drum and the predetermined number of winding layers at the time of winding, the rotation of the drum is stopped. There is no need to stop the rotation, which can further reduce the burden on the operator.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of an excavator according to an embodiment.

FIG. 2 is a schematic diagram showing a state where a rope is wound around the excavator according to the embodiment;

FIG. 3 is a diagram showing an operation state of a limit switch.

FIG. 4 is a diagram showing an operation state of a limit switch.

FIG. 5 is a circuit diagram according to the first embodiment;

FIG. 6 is a diagram showing a configuration near a drum of an excavator according to a second embodiment.

FIG. 7 is a circuit diagram according to a second embodiment;

FIG. 8 is a flowchart illustrating processing performed in a second embodiment.

FIG. 9 is a diagram showing another example of the second embodiment.

FIG. 10 is a schematic diagram showing a state where a rope is wrapped around in a third embodiment.

FIG. 11 is a schematic diagram showing a state where a rope is wound around a conventional excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator main body 2 Front drum 3 Rear drum 4 Excavation attachment 5 Sheave 6 Rope 9 Point sheave 10A, 10B, 11A, 11B Limit switch 16, 17 Operation lever 19 Buzzer 20, 21, 22, 23 Potentiometer 30, 31, Rotary encoder

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[Procedure amendment]

[Submission date] March 18, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment]

[Submission date] November 19, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

Claims (6)

[Claims] An end of one rope is connected to and wound around two drums rotatable in forward and reverse directions.
A rope winding device for a construction machine that winds or unwinds the rope by rotating the two drums in the forward and reverse directions, respectively, wherein a predetermined remaining amount when unwinding the rope of each drum and a predetermined winding when unwinding the rope; A rope hoisting apparatus for a construction machine, comprising: detecting means for detecting the number of layers to be taken; and output means for outputting a detection result by the detecting means. 2. A first switch, which is provided in the vicinity of a feed-out end of the rope of each of the drums and in the vicinity of an end portion having a predetermined number of winding layers, wherein the first switch turns on when the number of rope windings is equal to or less than a predetermined number. 2. The rope hoisting device of a construction machine according to claim 1, wherein the rope winding layer is a second switch that is turned on at a predetermined value or more. 3. The detecting means is provided on at least one of the vicinity of the feeding end of the rope of each of the drums and the vicinity of an end portion having the predetermined number of winding layers, and detects a signal corresponding to the winding layer and the number of windings of the rope. 2. The rope hoisting device of a construction machine according to claim 1, wherein the detector is an output detector. 4. The rope hoisting device according to claim 1, wherein the detecting means is a rope length detecting means for detecting a feeding amount and a winding amount of the rope. 5. The apparatus according to claim 1, wherein the output unit is a unit that issues an alarm based on the detection result.
The rope hoisting device for a construction machine according to any one of claims 4 to 7. 6. The hoisting rope of a construction machine according to claim 1, wherein the output unit is a unit that stops the rotation of each of the drums based on the detection result. apparatus.