JPH0732621Y2 - Retracting device for telescopic boom in self-propelled earth drill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a telescopic 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. 1, a self-propelled earth drilling device for a building column vehicle has an outrigger jack 1 (front) that can extend to the left and right sides of the vehicle A at the front and rear positions of the vehicle A so as to be grounded. Left), 2 (front right), 3 (rear left), 4 (rear right) are provided, and the telescopic boom 5 is mounted on the vehicle A so that it can be swung and raised and lowered, and is rotated at the tip of the telescopic boom 5. A freely movable earth drill 6 is hung, and the boom 5 is driven to fall down to press the earth drill 6 against the ground and rotate the earth drill 6 to make a hole in the ground. .

By the way, in this type of self-propelled earth drill apparatus, when the retracting driving force of the telescopic boom 5 is too large when a hole is drilled in the ground, the reaction force of the earth drill pressing force generated based on this retracting driving force is generated. However, there is a problem that one side of the vehicle A is levitated and the stability of the vehicle A is impaired. The operator
It is sufficient to operate so that the fall drive force of the telescopic boom 5 does not become excessive, but it is extremely difficult to catch the precursor of the uplift of the vehicle A, and it is almost impossible to impose such a duty on the operator. It was impossible.

In the self-propelled earth drill device, the present invention detects when the fall drive force of the telescopic boom 5 approaches a value that levitates one side of the vehicle A at the time of drilling a hole, and warns or limits the telescopic boom fall motion. It is intended to provide a boom fall restraining device in a self-propelled earth drill device.

(Means for Solving Problems) In order to achieve the above object, the boom fall restraining device in the self-propelled ground drilling device of the present invention is configured such that each outrigger jack has a ground reaction force of a predetermined value. When a detector that detects when the following is reached and one of these detectors or both of the detectors in an adjacent relationship detect that the ground reaction force of the corresponding outrigger jack is below a predetermined value, It is characterized in that each of the detectors is associated with an alarm means or a retractable boom fall-down regulation means so as to limit an alarm or a fall drive of the extendable boom.

(Operation) According to the above configuration, when the telescopic boom fall drive force approaches a value for levitating one side of the vehicle A, the alarm means is activated to alert the operator, or the boom fall limitation means is activated. Therefore, the fall of the boom is automatically restricted.

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 a telescopic boom fall restraining device in a self-propelled earth drill device of the present invention will be described with reference to FIGS.

2 and 3, 1a, 2a, 3a, 4a are detections for detecting when the ground reaction force of the outrigger jacks 1 to 4 is below a predetermined value on the outrigger jacks 1, 2, 3 and 4. It is a vessel. These detectors 1a to 4a are attached to the overhanging beam b of the corresponding outrigger jacks so as to be in contact with each other when the ground reaction force of the outrigger jacks 1 to 4 becomes substantially zero and to disconnect when the ground reaction force is sufficient. It is composed of limit switches. Specifically, a detector (limit switch) is attached to the outer end portion of the outer cylinder C in the overhanging beam b of the outrigger jack, so that the variation in the distance between the outer cylinder C and the inner cylinder d at the outer end portion of the outer cylinder C is changed. The detection is made (see FIG. 2). Reference numeral 7 is an alarm means, and 8 is a telescopic boom fall-down regulation means. In this example, the hydraulic cylinder 5a for driving the telescopic boom 5 to rise and fall when energized causes the hydraulic oil supply oil passage when the telescopic boom 5 falls. It is composed of an unload valve that unloads pressure oil. The detectors 1a to 4a are interposed in parallel with each other between the alarm means 7, the telescopic boom fall-down regulation means 8 and the power source 9.

In a state where the outrigger jacks 1 to 4 are grounded and the vehicle A is jacked up, the detectors 1a to 4a are disconnected, so that the alarm means 7 and the telescopic boom fall-down regulation means 8 do not function. From this state, when the telescopic boom 5 is driven to fall and the earth drill is pushed into the ground to perform a hole digging work, if at least one of the outrigger jacks 1 to 4 tries to rise due to the fall motion, the detector 1a to At least one of the contact points 4a is in contact, and the alarm means 7 and the telescopic boom fall-down regulation means 8 are activated. Therefore, the operator can know the state before the fall of the telescopic boom 5 is about to lift at least one of the outrigger jacks 1 to 4 by operating the alarm means 7.

Further, the operation of the telescopic boom swaying restriction means 8 automatically restricts the spilling of the telescopic boom.

In the above embodiment, the warning means 7 and the telescopic boom fall-down regulation means 8 are actuated immediately before the lifting of at least one of the outrigger jacks 1 to 4, but the warning means 7 is configured in this way. In addition, the telescopic boom fall-down restricting means 8 may be activated long before one side of the vehicle A (the side to which the telescopic boom 5 is directed) is in a floating state. In other words, considering the twist of the vehicle frame, one of the two adjacent outrigger jacks on one side of the vehicle A floats up long before the one side of the vehicle A floats. is there. In such a case, when the ground reaction force of both adjacent outrigger jacks reaches a predetermined value, the alarm means 7 or the telescopic boom fall-down regulation means 8 may be activated. In this case, as shown in FIG. 4, two contacts of each detector are provided, and the contacts of two corresponding detectors of the adjacent outrigger jacks are connected in series, and these series connection circuits are connected in parallel. It may be connected to the power source 9 and the alarm means and the telescopic boom fall-down regulation means.

Further, it goes without saying that the detector in the above embodiment may be constituted by a load cell or the like for measuring the force acting on the jack e of the outrigger jacks 1 to 4.

Further, it goes without saying that one of the warning means 7 and the telescopic boom fall-down regulation means 8 may be omitted.

(Effect) The retracting control device for the telescopic boom in the self-propelled earth drill device of the present invention configured and acting as described above has an extremely simple structure, but prevents the one side of the vehicle from being lifted up due to the fall motion of the telescopic boom. Since it detects this and gives an alarm in advance or automatically limits the retractable boom's falling motion, the self-propelled earth drill device will not become unstable due to excessive expansion of the expanding boom. It can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a self-propelled earth drill device. Second
FIG. 4 to FIG. 4 are explanatory views of a fall restraining device for a telescopic boom of the present invention, FIG. 2 is an example of mounting a detector on an outrigger jack, FIG. 3 is a structural explanatory view, and FIG. FIG. 7 is a structural explanatory view of another example. 1,2,3,4; Outrigger jack, 1a, 2a, 3a, 4a; Detector, 5;
Telescopic boom, 7; alarm means, 8; telescopic boom fall restraining means

Claims (1)

[Scope of utility model registration request] 1. A front and rear position of a vehicle is provided with outrigger jacks which extend to the left and right sides of the vehicle so as to be able to contact the ground, and a telescopic boom is mounted on the vehicle so that it can be swung and raised and lowered, and the tip of the telescopic boom. An earth drill that can be rotationally driven is hung, and the boom is laid down to press the earth drill against the ground and the earth drill is rotationally driven to form a hole in the ground. In the traveling ground drilling device, a detector that detects when the ground reaction force of the outrigger jack is equal to or less than a predetermined value is attached to each of the outrigger jacks, and one of these detectors or a detector in an adjacent relation When both sides detect that the ground reaction force of the corresponding outrigger jack falls below a specified value, an alarm is issued or the telescopic boom falls over. In order to limit the drive, each of the detectors is associated with an alarm means or a telescopic boom fall restraining means, and a fall restraining device for a telescopic boom in a self-propelled earth drill device is characterized.