JPH0732620Y2 - Boom collapse control device for self-propelled earth drill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a boom fall restraining device in a self-propelled earth drill device typified by a building truck or the like.

(Prior Art) As shown in FIG. 4, a self-propelled earth drill device for a building column vehicle is mounted on a vehicle A so that it can be driven up and down, and a boom 1 that is driven up and down by a hydraulic cylinder 2 for driving up and down. An earth drill 3 that can be rotationally driven is suspended at the tip, and the hydraulic cylinder 2 drives the boom 1 to fall and press the earth drill 3 against the ground, and the earth drill 3 is rotationally driven to form a hole in the ground. Is to be drilled.

By the way, in this type of self-propelled earth drill device, when the lodging driving force of the boom 1 by the hydraulic cylinder 2 is too large when the hole is drilled in the ground, the earth drill pressing force generated based on this lodging driving force is counteracted. There was a problem that the force levitates one side of the vehicle A and the stability of the vehicle A is impaired. It suffices for the operator to operate the hydraulic cylinder 2 for raising and lowering drive so that the fall drive force of the boom 1 does not become excessive, but it is extremely difficult to catch the precursor of the uplift of the vehicle A. It was almost impossible to impose such a duty of care.

In the self-propelled earth drill apparatus, the present invention detects when the lodging driving force of the boom 1 approaches a value that causes one side of the vehicle A to float during boring a hole, and alarms or limits the boom falling motion. It is intended to provide a boom fall restraining device for a self-propelled earth drill device.

(Means for Solving the Problems) In order to achieve the above object, the boom fall restraining device in the self-propelled earth drill device of the present invention is a boom for detecting the boom fall driving force of the undulating drive hydraulic cylinder. Tilt drive force detector, boom hoisting angle detector that detects the hoisting angle of the boom, and a limit value output that receives a boom hoisting angle signal from the boom hoisting angle detection means and outputs a limit value as a function of the boom hoisting angle. Means, comparing means for receiving a limit value signal from the limit value output means and a signal from the boom fall drive force detector, and outputting a boom fall regulation signal when the latter signal or the former signal is reached, and comparing means And a boom swaying limiter which is activated by a boom swaying restriction signal from the above. Detection of the boom fall drive force detector when the boom fall drive force of the hydraulic cylinder generates a push force slightly lower than the push force at which one side of the vehicle starts to float when the rill is pressed against the ground. It is characterized in that a value corresponding to the value is output as a function of the boom hoisting angle.

(Operation) According to the above configuration, when the boom fall drive force of the hydraulic cylinder for raising and lowering approaches a value for levitating one side of the vehicle A, the alarm means is activated to alert the operator or the boom fall position. The motion limiting means is activated to automatically limit the fall of the boom.

Therefore, it is possible to prevent instability of the vehicle A by floating one side of the vehicle A at the time of punching the hole.

(Embodiment) An embodiment of the boom fall restraining device in the self-propelled earth drill device of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a self-propelled earth drill device, and the same parts as those of the self-propelled earth drill device shown in FIG.

In FIGS. 1 and 2, reference numeral 4 is a boom fall drive force detector for detecting the boom fall force of the boom 1 of the hydraulic cylinder 2 for raising and lowering, and is mounted on the piston rod or the bracket portion of the hydraulic cylinder 2. The load cell 4a (force-electrical signal converter) or the hydraulic-electrical converter 4b for measuring the hydraulic pressure supplied to the pressure-oil chamber on the reduction operation side of the hydraulic cylinder 2 is used. Reference numeral 5 is a boom hoisting angle detector that detects the hoisting angle of the boom 1, and is composed of a potentiometer. Reference numeral 6 is a limit value output means for receiving a boom hoisting angle signal from the boom hoisting angle detector 5 and outputting a later-described limit value Fmax as a function of the boom hoisting angle θ. 7 is
It is a comparing means that receives the limit value signal Fmax from the limit value output means and the signal from the boom fall drive force detector F, and outputs the boom fall regulation signal L when the latter signal reaches the former signal. Reference numeral 8 is an alarm means that operates in response to the boom collapse control signal L of the comparison means 7, and is composed of a horn and an alarm lamp or any one of them.

The limit value output means 6 has a slightly lower pressing force than the pressing force at which one side of the vehicle A starts to float when the boom 1 is driven to fall and the earth drill 3 is pressed against the ground.
The value corresponding to the detection value of the boom fall drive force detector 4 when the boom fall drive force is generated is output as a function of the boom hoist angle θ. Specifically, it is composed of a digital memory that uses the boom hoisting angle signal as an index signal. The limit value is used as a function of the boom hoisting angle θ because the pressing force at which one side of the vehicle A starts to float changes with a change in the boom hoisting angle θ. If the boom 1 is a telescopic boom, a boom length detector 9 for detecting the length of the boom 1 is provided, and the boom length signal 1 from the boom length detector 9 is sent to the limit value output means 6. In addition to being input, the limit value output means 6 is configured to emit a limit signal as a function of the boom hoisting angle θ and the boom length l.

When the boom 1 is driven to fall by the hydraulic cylinder 2, and thereby the earth drill 3 is pressed against the ground to punch a hole, when the boom falling drive force of the hydraulic cylinder 2 approaches that which causes one side of the vehicle A to float. Since the detection output of the boom fall drive force detector 4 reaches the limit value Fmax generated by the limit value output means 6, the comparison means 7 outputs the boom fall regulation signal L. As a result, the alarm means 8 is activated to notify the operator that the boom driving force has reached the limit. Therefore, the operator receives this notification to stop or decelerate the fall motion of the boom 1. Therefore, it is possible to prevent the one side of the vehicle from rising.

In the above-described embodiment, the alarm means 8 is activated by the boom fall control signal L issued by the comparison means 7, but as shown in FIG. Boom collapse control means 10 that automatically restricts the collapse of 1
Of course, it may be configured to operate. That is, as shown in FIG. 3, the hydraulic cylinder 2 for driving the undulations.
It is also possible to make the boom swaying restriction means (unload valve) 10 attached to the drive hydraulic circuit of (1) function via a switch connected and operated by the boom swaying restriction signal L.

(Effects) The boom falling control device in the self-propelled earth drill device of the present invention configured and operated as described above is designed so that when the boom is tilted and the earth drill is pressed against the ground to punch a hole in the ground, The alarm is provided immediately before one side of the vehicle tries to ascend due to the fall, or the boom is limited to fall.Therefore, the self-propelled earth drill device may become unstable due to the excessive fall of the boom. It can be prevented.

[Brief description of drawings]

1 to 3 show an embodiment of a boom falling control device in a self-propelled earth drill device of the present invention, FIG. 1 is an explanatory view of the self-propelled earth drill device, and FIG. 1 is an explanatory view of a boom fall restraining device implemented in the self-propelled earth drill device of FIG. 1, and FIG. 3 is an explanatory view of another embodiment of FIG. FIG. 4 is an explanatory diagram of a self-propelled earth drill device. Vehicle: A, boom; 1, hydraulic cylinder for boom hoisting; 2, ground drill; 3, boom fall drive force detector; 4, boom hoisting angle detector; 5, limit value output means; 6, comparison means; 7 , Alarm means; 8, boom fall restraint means; 10

Claims (1)

[Scope of utility model registration request] 1. A ground drill rotatably driven is suspended from the tip of a boom that is mounted on a vehicle so that it can be lifted up and down and is driven up and down by a hydraulic cylinder for driving ups and downs. A boom fall control device in a self-propelled earth drill device configured to punch a hole in the ground by pressing the ground drill and rotating the ground drill, wherein the boom fall drive of the hydraulic cylinder for raising and lowering is performed. Boom fall drive force detector to detect force,
Boom hoisting angle detector for detecting the hoisting angle of the boom, limit value output means for receiving a boom hoisting angle signal from the boom hoisting angle detection means, and outputting a limit value as a function of the hoisting angle of the boom, the limit value output Comparing means for receiving a limit value signal from the means and a signal from the boom fall drive force detector and outputting a boom fall regulation signal when the latter signal reaches the former signal, and boom fall regulation from the comparing means The limit value output means is slightly lower than the pressing force at which one side of the vehicle starts to float when the boom is tilted and the earth drill is pressed against the ground. The value corresponding to the detection value of the boom fall drive force detector when the pressing force of is generated by the boom fall drive force of the hydraulic cylinder is defined as a function of the boom hoist angle. Boom lowering motion restricting device in the self-propelled ground drill apparatus characterized by Te are configured to output.