JPH0752238Y2 - Safety device for digging column car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a safety device for a digging column truck.

(Prior Art) As shown in FIG. 4, a conventional digging column truck has a telescopic boom 1 at the tip of a telescopic boom 1 which is mounted on a vehicle A so that it can be raised and lowered and is driven up and down by a hydraulic cylinder 2 for driving up and down. The auger drill 3 which can be rotationally driven is suspended, and the telescopic boom is driven to fall down to press the auger drill 3 on the ground and the auger drill 3 is rotationally driven to form a hole in the ground.
Drive the telescopic boom 3 up and down to lift the auger drill 3 through the hole.
I try to pull it out. The telescopic boom 1 includes a base boom 4 and a front boom 5, and the base boom 4 is connected to the front boom 5.
Is inserted and an appropriate drive means (for example, a hydraulic cylinder or the like) is arranged between them to allow the front boom 5 to extend and contract from the base boom 4. Therefore, the front boom 5 is extended from the base boom 4, the auger drill 3 hung at the tip of the front boom 5 is positioned farther than the position where the vehicle A is installed, and a hole is drilled in the ground located at this distance. I am able to do that.

(Problems to be solved by the invention) By the way, after a hole is drilled in the ground by this type of digging tower, the telescopic boom 3 is raised by the pressing cylinder 2 and the auger drill 3 is pulled out from the hole. When removing, the auger drill 3 may not be able to be removed from the drilled hole depending on the soil properties. At this time, if the elevating driving force of the hydraulic cylinder 2 is increased and the auger drill 3 is forcibly pulled out, an excessive force acts on the telescopic boom 1 and the telescopic boom 1 or the like may be deformed. . Especially when the telescopic boom 1 is extended, compared to when the telescopic boom 1 is contracted,
The auger drill 3 with the same lifting drive force by the hydraulic cylinder 2.
Even if it is pulled out, the force acting on the telescopic boom 1 becomes excessive. Therefore, if the hydraulic cylinder 2 is inadvertently lifted up in the same manner as when the telescopic boom 1 is contracted even though the telescopic boom 1 is being extended, the telescopic boom 1 and the like will be deformed. Had. Therefore, when the operator pulls out the auger drill 3, the operator may operate the hydraulic cylinder 2 for raising and lowering the telescopic boom 1 so that excessive force does not act on the telescopic boom 1.
It was extremely difficult to catch the signs that excessive force would be exerted on the operator, and it was almost impossible to impose such duty of attention on the operator.

The present invention, when the telescopic boom is lifted after the hole is drilled in the ground by the boring wheel and the auger drill is pulled out from the drilled hole, the telescopic boom elevating drive force is detected to expand and contract. An object of the present invention is to provide a digging column vehicle that detects that the boom is approaching a state in which an excessive force is applied and limits the raising and lowering of the telescopic boom.

(Means for Solving the Problems) In order to achieve the above object, the safety device for a digging column vehicle of the present invention is an extension / contraction system that is mounted on a vehicle so that it can be lifted and lowered by a hydraulic cylinder for driving the lift. An auger drill, which can be driven to rotate, is hung at the tip of the boom, and the telescopic boom is tilted to push the auger drill to the ground and the auger drill is driven to rotate. A safety device for a digging column truck configured to drive up and down to remove an auger drill from a drill hole. Elevation drive force detector, Telescopic boom length detector for detecting telescopic boom length of the telescopic boom, Receiving telescopic boom length signal from this telescopic boom length detector, as a function of telescopic boom length of telescopic boom Limit value output means for outputting a boom elevating force limit value, and a limit value signal from the limit value output means and a signal from the telescopic boom elevating drive force detector are received to extend or contract when the latter signal reaches the former signal. The present invention is characterized by comprising a comparing means for outputting a boom raising / lowering regulation signal, and an alarm means or a telescopic boom raising / lowering limiting means activated by a telescopic boom raising / lowering regulation signal from the comparing means.

(Operation) The safety device for a digging column vehicle of the present invention having the above-described structure makes the telescopic boom elevating drive force of the hydraulic cylinder for the undulation drive act in such a state that an excessive force acts on the telescopic boom. When approaching, the alarm means activates to alert the operator,
Alternatively, the telescopic boom raising / lowering limiting means is activated to automatically limit the raising / lowering movement of the telescopic boom. For this reason, when the telescopic boom is driven up and down by a hydraulic cylinder to remove the auger drill from the drill hole, if the auger drill cannot be removed from the drill hole due to the soil quality of the ground, try to forcibly remove the auger drill. Also, an accident such as deforming the telescopic boom or the like can be prevented in advance without applying an excessive force to the telescopic boom or the like.

(Embodiment) An embodiment of the safety device for a digging column vehicle of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, reference numerals 1 to 5 are the same as those shown in FIG. 4 and described in the related art, and therefore the description thereof is omitted.

In FIG. 1 and FIG. 2, 6 is a telescopic boom raising / lowering drive force detector for detecting the raising / lowering drive force of the telescopic boom 1 of the hydraulic cylinder 2 for raising / lowering drive, and is a piston rod or bracket of the hydraulic cylinder 2. Rod cell 6a inserted in part
(Force-electrical signal converter) or a pressure transducer 6b (pressure-electrical signal converter) for measuring the hydraulic pressure supplied to the expansion operation side pressure oil chamber of the hydraulic cylinder 2. Reference numeral 7 denotes a telescopic boom length detector for detecting the telescopic boom length of the telescopic boom 1. The tip of the cord fed from the cord winder attached to the base boom 4 is fixed to the tip of the tip boom 5, When the front boom 5 is extended and retracted from the base boom 4, the length of the telescopic boom is detected by using the potentiometer for the cord winding amount by the cord winder.
Numeral 8 is a limit value output means for receiving a telescopic boom length signal from the telescopic boom length detector 7 and outputting a boom elevating force limit value Fmax described later as a function of the telescopic boom length l. 9
Receives the limit value signal Fmax from the limit value output means and the signal F from the telescopic boom raising / lowering driving force detector 6, and when the latter signal F reaches the former signal Fmax, the telescopic boom raising / lowering regulation signal L is generated. It is a comparison means for outputting. Reference numeral 10 is a warning means which is activated by the telescopic boom raising / lowering restriction signal L of the comparison means 9, and is constituted by a horn 11 and a warning lamp 12 or any one of them.

The limit value output means 8 raises and lowers the telescopic boom 1 by the hydraulic cylinder 2 so that the auger drill 3 cannot be pulled out from the hole, and the raising drive force of the hydraulic cylinder 2 is increased to force. Trying to pull out the auger drill 3,
As a function of the telescopic boom length l, a value corresponding to the detection value of the telescopic boom raising / lowering drive force detector 6 when the telescopic boom 1 is deformed to deform the telescopic boom 1 or the like due to an excessive force is applied. It is what is output. Specifically, it is composed of a digital memory that uses the telescopic boom length signal as an index signal. The boom elevating force limit value is set as a function of the telescopic boom length l because the telescopic boom elevating driving force when the telescopic boom 1 is deformed to deform the telescopic boom 1 is This is because the telescopic boom length f is changed along with the change. It should be noted that the limit value output means 8 in the above-mentioned embodiment only needs to hoist the telescopic boom 1 by the length of the auger drill 3 during the drilling work with the auger drill 3, and the hoisting angle of the telescopic boom 1 is used within a relatively narrow range. Therefore, the function of the hoisting angle of the telescopic boom 1 is omitted and is output only as a function of the telescopic boom length 1. However, when a long auger drill is used, or when the boom hoisting force limit value is accurately output, a telescopic boom hoisting angle detector 13 for detecting the hoisting angle of the telescopic boom 1 is provided. Hoisting angle signal θ from telescopic boom hoisting angle detector
Is input to the limit value output means 8, and the limit value output means 8 may be configured to output a limit value signal as a function of the telescopic boom length 1 and the telescopic boom hoisting angle θ.

The safety device for a digging column vehicle constructed in this way operates as follows. Telescopic boom 1 to hydraulic cylinder 2
When the auger drill 3 is removed from the hole by elevating and driven by the machine and the auger drill 3 cannot be removed from the hole due to the soil properties of the ground, the hydraulic cylinder 2 is lifted to force the auger drill 3 to be removed. When the elevation drive force is increased and an excessive force is applied to the telescopic boom 1 to approach a precursory state in which the telescopic boom 1 and the like are deformed, the telescopic boom is raised to the boom elevation force limit value Fmax output by the limit value output means 8. Since the signal F from the elevation driving force detector 6 arrives, the telescopic boom raising / lowering regulation signal L from the comparison means 9 is issued. As a result, the alarm means 10 is activated to notify the operator that the raising / lowering driving force of the hydraulic cylinder 2 is approaching a precursory state in which the telescopic boom 1 and the like are deformed. Therefore, the operator receives the notification and stops or decelerates the raising and lowering of the telescopic boom 1. Therefore, it is possible to prevent accidents such as deformation of the telescopic boom.

In the above embodiment, the warning means 10 is activated by the telescopic boom raising / lowering regulation signal L issued by the comparison means 9, but as shown in FIG. As a matter of course, the telescopic boom raising / lowering limiting means 14 for automatically limiting the raising / lowering of the telescopic boom 1 may be operated. That is, as shown in FIG. 3, the telescopic boom raising / lowering restricting means (unload valve) 14 attached to the driving hydraulic circuit of the hydraulic cylinder 2 for hoisting drive is connected by the telescopic boom raising / lowering restriction signal L. The switch may be made to function.

(Effect of the Invention) Since the present invention is configured and operates as described above,
When the telescopic boom is driven up and down by a hydraulic cylinder to remove the auger drill from the drill hole, if the auger drill cannot be removed from the drill hole due to the soil properties, it will expand or contract even if you try to forcibly remove the auger drill. Without applying excessive force that deforms the telescopic boom etc. to the boom etc.,
Accidents such as deforming the telescopic boom can be prevented in advance.

[Brief description of drawings]

1 and 2 are explanatory views of a safety device for a digging column vehicle of the present invention, and FIG. 3 is an explanatory view of another embodiment of a safety device for a digging column vehicle according to the present invention, FIG. 4 is an explanatory view of a conventional boring column car. A: Vehicle, 1: Telescopic boom, 2: Hydraulic cylinder, 3: Auger drill, 6: Telescopic boom elevation drive force detector, 7: Telescopic boom length detector, 8: Limit value output means, 9: Comparison means, 10: Alarm means, 1
4: Telescopic boom raising and lowering limit means

Claims (1)

[Scope of utility model registration request] 1. An auger drill, which is rotatably mounted on a vehicle and is rotatably driven by a hydraulic cylinder for driving undulation, hangs a freely rotatable auger drill at the tip of the telescopic boom, and drives the telescopic boom to fall and descend to drive the auger drill. By pushing the to the ground and rotating the auger drill, a hole is drilled in the ground, and the telescopic boom is driven up and down to remove the auger drill from the drilled hole. A safety device, a telescopic boom elevating drive force detector for detecting the telescopic boom elevating drive force of the undulating drive hydraulic cylinder, a telescopic boom length detector for detecting the telescopic boom length of the previous telescopic boom,
Limit value output means for receiving a telescopic boom length signal from the telescopic boom length detector and outputting a boom raising force limit value as a function of the telescopic boom length of the telescopic boom, and the limit value signal from the limit value output means and the above-mentioned limit value output means. It operates by the comparison means that receives the signal from the telescopic boom raising / lowering drive force detector and outputs the telescopic boom raising / lowering regulation signal when the latter signal reaches the former signal, and the telescopic boom raising / lowering regulation signal from the comparing means. A safety device for a digging column vehicle, comprising a warning means or a boom extension / reduction limiting means.