JP3480982B2 - Fall prevention device used for digging pole cars - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention device for use in a boring column car.

[0002]

2. Description of the Related Art As shown in FIG.
An auger support in which a telescopic boom 3 having a suspending tool 4 suspended in a vertically movable manner is movably mounted on a swivel base 2 mounted on the top of the swivel base 2 and an auger 7 is mounted via a rotary drive device 6. 5 is the base boom 3 of the telescopic boom 3
In a state where the auger is not used (a state shown by a virtual line in FIG. 2) for crane work, the auger support 5 is attached to the tip portion of a and the tip portion of the top boom 3c so as to be alternately connectable to each other, and the auger support 5 is attached to the base boom 3a. Connected to the tip of
In the use state of the auger (state shown by the solid line in FIG. 2), the auger support 5 is connected to the tip portion of the top boom 3c. The rotary drive device 6 that rotationally drives the auger 7 is composed of a rotary hydraulic actuator, and the hydraulic oil that drives the rotary actuator is a hydraulic unit 8 arranged in the vehicle 1 and an auger drive control device provided in the swivel base 2. 9. The oil is supplied and discharged through the oil supply / discharge oil passage 10.

A portion of the oil supply / discharge passage 10 connecting the auger drive control device 9 and the rotary drive device 6 along the telescopic boom 3 is formed of a flexible supply / discharge hose 10a. The supply / discharge hose 10a is provided on the base boom 3a.
Outer case 11 installed alongside the outer case 11
When the auger support 5 is attached to the top boom 3c and is telescopically inserted into the telescopic boom 3 when the auger is in use.
The hose guide 12 is driven to expand and contract in conjunction with the expansion and contraction of the hose.

The supply / discharge hose 10a includes an outer case 11
When the hose guide 12 expands and contracts in conjunction with the expansion and contraction movement of the telescopic boom 3, it is folded back in a U-shape between the distal end of the hose guide 12 and the base end of the hose guide 12 (the auger support 5
When the auger connected to the tip portion of the top boom 3c is in use), the U-shaped folded portion is transferred to secure the supply and discharge of hydraulic oil to the rotary drive device 6. .

On the swivel base 2, a hoisting drive control device 13 for controlling hoisting drive of the telescopic boom 3, a telescopic drive control device 14 for controlling telescopic drive of the telescopic boom 3, and a hoisting device for hoisting and lowering the hoisting device 4. A drive control device 15 and a swing drive control device 16 for controlling the swing drive of the swivel base 2 are provided.

[0006] This type of digging column vehicle has been widely used in recent years because it can perform digging work by the auger 7 and work to put a pole such as an electric pole in the hole, and its construction is well known. Has become.

On the other hand, this type of digging column vehicle is equipped with a fall prevention device for ensuring safety in the case of crane work (when the auger is not used). As shown in FIG. 3, the conventional fall prevention device includes a retractable drive control device 13, an extendable drive control device 14 and a lifting device drive control device 15 for the telescopic boom 3, a retractable movement of the telescopic boom 3, and an extension movement of the telescopic boom 3. And a stop signal output means 17 for outputting a stop signal for stopping the hoisting motion of the hanger 4.
The stop signal output means 17 is configured to output the stop signal when the actual value of the load in the falling direction acting on the telescopic boom 3 reaches the limit value.

The configuration of the stop signal output means 17 as such a fall prevention device is known as a so-called moment limiter, but more specifically, it is configured as follows. That is, the stop signal output means 17 is: an actual value detection means 17a for detecting an actual value of the load in the falling direction acting on the telescopic boom 3, an undulation angle detection means 17b for detecting an actual undulation angle Θ of the telescopic boom 3, A boom length detecting means 17c for detecting the actual length L of the telescopic boom 3, a signal from the hoisting angle detecting means 17b and the boom length detecting means 17c, and in the present telescopic boom posture,
Limit value output means 17d for outputting the limit value of the falling direction load that can act on the telescopic boom 3; -Receiving signals from the actual value detection means 17a and the limit value output means 17d, the former value reaches the latter value. Then, the comparison means 17e for outputting the stop signal is constituted. The stop signal output from the comparison means 17e is input as a stop signal of the stop signal output means 17 to the up-and-down drive control means 13, the telescopic drive control means 14, and the lifting gear drive control means 15, and the telescopic boom 3 falls down. , Extension movement, and hoisting movement of the hanger 4 are stopped.

In the conventional fall-prevention device thus constructed, when the actual value of the load in the falling direction acting on the telescopic boom 3 reaches the limit value, the telescopic boom 3 moves in the direction in which the actual value of the load increases. (Looping movement and extension movement) and the movement of hoisting equipment 4 (winding movement) are automatically stopped, so that it is possible to prevent the digging column vehicle from tipping over when performing crane work. There is.

However, in the case of a digging column vehicle equipped with such a fall prevention device, the following problems occur when digging work while the auger is in use.

When digging work with an auger using a digging column truck, the auger 7 hung from the tip of the top boom 3c is driven to rotate by a rotary drive device 6 and the auger 7 is used. Is used to vertically push or pull the telescopic boom 3 vertically into and out of the ground by using the hoisting drive and the telescopic drive in combination. At this time, the combined drive of the hoisting drive and the telescopic drive of the telescopic boom 3 is performed as follows. That is, when the auger 7 is pushed vertically into the ground, the fall drive of the telescopic boom 3 and the contraction drive of the telescopic boom 3 are used together.
When pulling out from the ground, the elevating drive of the telescopic boom 3 and the extension drive of the telescopic boom 7 are used together.

[0012]

Considering the case where the auger 7 is pulled out from the ground among the above-mentioned digging work, the telescopic boom 3 receives an excessive load in the falling direction.
This load is often a fall prevention device (stop signal output means 1
7) is reached and a value sufficient to output the stop signal is reached.
Therefore, the extension movement of the telescopic boom 3 is stopped during the pulling-out of the auger 7, and as a result, the vertical pulling-out of the auger 7 becomes impossible and the pulling-out work of the auger 7 is significantly reduced.

The present invention is intended to provide a fall prevention device which does not reduce the efficiency of the auger drawing operation.

[0014]

In the fall prevention device according to the present invention, since the auger 7 is fitted into the ground or is grounded when the auger is being used in a digging column truck, the telescopic boom 3 is assumed.
Even if the actual value of the load in the lodging direction acting on the vehicle exceeds the limit value, the digging column vehicle does not tip over. In other words, when the auger 7 is used, the stop signal from the stop signal output means 17 is used. Even if the extension movement of the telescopic boom 3 is not stopped, the digging column vehicle does not fall down, and the efficiency of the pulling out work of the auger 7 is improved. To do.

A fall prevention device for use in a digging column truck, wherein when the actual value of the load in the falling direction acting on the telescopic boom 3 reaches a limit value, the hoisting drive control device 13 for the telescopic boom 3 and the telescopic drive. Controller 14 and lifting device drive controller 15
In order to detect the auger usage state, a stop signal output means 17 for outputting a stop signal for stopping the retractable movement of the telescopic boom 3, the extension movement of the telescopic boom 3, and the hoisting movement of the hanger 4 is detected. Providing auger usage status detection means,
The detection signal from the auger usage state detection means is input to the stop signal output means 17, and the stop signal output means 17 is
A fall prevention device used for a digging column vehicle, wherein at least a stop signal to the extension drive control device 14 is not output when a detection signal from the auger usage state detection means is received.

[0016]

In the fall prevention device used in the digging column vehicle of the present invention configured as described above, the detection signal from the auger usage state detecting means is provided in the auger working state in which the digging column vehicle is not likely to fall. It is adapted to be input to the stop signal output means 17. In this state, since the stop signal output means 17 does not output a stop signal to the telescopic drive control device 14, the extension motion of the telescopic boom 3 is stopped while the auger 7 is being pulled out and the auger 7 is pulled out. There is no reduction in efficiency. When carrying out crane work with the auger not in use, the detection signal from the auger use state detection means is not input to the stop signal output means 17, so it is possible to ensure the safety of crane work as in the conventional fall prevention device. You can do it.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fall prevention device used for a digging column truck of the present invention will be described below with reference to FIG. Since the fall prevention device according to the present invention is a partial modification of the configuration of the conventional fall prevention device, in the following description, the reference numerals described above for the description of the conventional fall prevention device are used as the same meanings as they are. Incorporate.

FIG. 1 shows a fall prevention device of the present invention. In FIG. 1, reference numeral 18 is an auger use state detecting means for detecting an auger use state (a state in which the auger support 5 is connected to the tip portion of the top boom 3c of the telescopic boom 3 and the auger 7 is suspended from the tip portion of the top boom 3c). is there. The specific configuration of the auger usage state detecting means 18 will be described later.

The detection signal of the auger use state detecting means 18 (outputted when the auger 7 is in use state) is input to the stop signal output means 17. Reference numeral 19 denotes an output portion of the output signal from the comparison means 17e in the stop signal output means 17 (this output signal corresponds to the stop signal of the stop signal output means 17).
It is a breaking means interposed in a circuit which is transmitted to the expansion / contraction drive control device 14. The detection signal from the auger use state detecting means 18 is input to the shut-off means 19 in the stop signal output means 17. Then, the cutoff means 19 is always provided with the expansion / contraction drive control device 14 for the output signal (stop signal) of the comparison means 17e.
To the telescopic drive control device 14 by cutting off the output signal (stop signal) of the comparison means 17e when the detection signal from the auger usage state detection means 18 is received. Is configured as follows.

The auger use state detecting means 18 is composed of a limit switch provided at the tip of the base boom 3a of the telescopic boom 3 as indicated by reference character A in FIG.
The limit switch A is configured to detect the state where the auger support 5 is separated from the base boom 3a. The state where the auger support 5 is separated from the base boom 3a is the auger use state in which the auger support 5 is connected to the top boom 3c and the telescopic boom 3 is extended. Therefore, the limit switch A serving as the auger use state detecting means 18 is The usage state of the auger can be detected.

Further, the auger usage state detecting means 18 is
It may be configured by a limit switch attached at a proper position of the outer case 11 as shown by reference character B in FIG. In this case, the limit switch B is configured to detect the state in which the hose guide 12 is extended from the outer case 11. The state where the hose guide 12 extends from the outer case 11 is the state where the auger support 5 is connected to the top boom 3c and the telescopic boom 3 extends, so the limit switch B that is the auger use state detecting means 18 is The usage status can be detected.

In the fall prevention device configured as described above, the detection signal of the auger use state detection means is input to the stop signal output means 17 in the use state of the auger in which there is no fear that the digging column vehicle will fall. In this state, the stop signal output means 17
Since the stop signal is not output from the telescopic drive control device 14 to the telescopic drive control device 14, the extension movement of the telescopic boom 3 does not stop during the withdrawal of the auger 7 to reduce the efficiency of the auger 7 withdrawal operation. .

When the crane is operated without using the auger, since the detection signal from the auger use state detecting means 18 is not input to the stop signal output means 17, the safety of the crane work is ensured like the conventional fall prevention device. It can be secured.

[0024]

EFFECTS OF THE INVENTION The fall prevention device used in the digging column vehicle of the present invention constructed as described above has a simple structure in which only a part of the conventional fall prevention device is added or changed. 7 has an excellent effect that the work of extracting from the excavation hole of 7 can be efficiently performed.

[Brief description of drawings]

FIG. 1 is an explanatory view of a fall prevention device used for a digging column truck according to the present invention.

FIG. 2 is an explanatory view of a digging column truck.

FIG. 3 is an explanatory view of a conventional fall prevention device used in a digging column truck.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Vehicle, 2; Revolving base, 3; Telescopic boom, 3a; Base boom, 3c; Top boom, 4; Lifting tool, 5; Auger support, 6; Rotation drive device, 7; Auger, 8; Hydraulic unit, 9 Auger drive control device, 10; oil supply / drain passage, 10a;
Supply and discharge hose, 11; outer case, 12; hose guide,
13; undulation drive control device, 14; telescopic drive control device, 15; lifting device drive control device, 16; turning drive control device, 17; stop signal output means, 17a; actual value detection means, 17b; undulation angle detection means, 17c; boom length detection means 17d; limit value output means,
17e; comparison means, 18; auger usage state detection means, 19; cutoff means,

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Claims (3)

(57) [Claims] 1. An auger in which a telescopic boom equipped with a suspending device which is vertically driven is movably attached to a swivel mounted on a vehicle so as to be hoistable, and an auger is attached via a rotary drive device. The support is attached to the tip of the base boom of the telescopic boom and the tip of the top boom so as to be alternately connectable, and in the auger non-use state for crane work, the auger support is connected to the tip of the base boom. When the auger is in use, the auger support is connected to the tip of the top boom, and a hose for supplying / discharging hydraulic oil to / from the rotary drive device is attached to the outer case along the base boom and the outer case. When the auger with the auger support attached to the top boom is telescopically inserted, it is driven to expand and contract in conjunction with the expansion and contraction movement of the expansion boom. A fall prevention device used for a digging column vehicle configured to be guided by a hose guide, wherein when the actual value of the load in the laying direction acting on the telescopic boom reaches a limit value, the telescopic boom The hoisting drive control device, the telescopic drive control device, and the lifting device drive control device are provided with stop signal output means for outputting a stop signal for stopping the fall motion of the telescopic boom, the extension motion of the telescopic boom, and the hoisting motion of the lifting device. The auger use state detecting means for detecting the auger use state is provided, and the detection signal from the auger use state detecting means is input to the stop signal output means, and the stop signal output means detects the auger use state. In the state of receiving the detection signal from the means, at least the stop signal to the expansion / contraction drive control device is not output, and the hole excavation pillar is characterized. Fall prevention device for use in. 2. An auger use state detecting means for detecting an auger use state is provided at a tip portion of the base boom of the telescopic boom, and is a detection switch for detecting that the auger support is separated from the tip portion of the base boom. The fall prevention device for use in a digging column vehicle according to claim 1, wherein the fall prevention device is configured. 3. The digging according to claim 1, wherein the auger use state detecting means for detecting the auger use state is constituted by a detection switch for detecting an extension state of the hose guide with respect to the outer case. A fall prevention device used in a building column car.