JPH0735902Y2 - 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 vehicle has an outrigger jack 1 (front left) that can extend to the front and rear positions of a vehicle A and project on both left and right sides of the vehicle, 2 (front right), 3 (rear left), 4 (rear right) are provided, and a boom 5 is mounted on the vehicle A so that it can be swung and raised and lowered, and an auger drill that can be rotationally driven at the tip of the boom 5. 6 is suspended, the boom 5 is driven to fall, the auger drill 6 is pressed against the ground, and the auger drill 6 is rotationally driven, thereby making a hole in the ground.

(Problems to be solved by the invention) By the way, when a hole is to be drilled in the ground by this type of boring wheel, the auger drill 6 is normally rotated by the propulsive force of the auger drill 6 itself due to the soil quality of the ground. At times, the boom 5 may be excessively retracted, or when the auger drill 6 is reversely rotated, the boom 5 may be excessively pushed up. At this time, there is a problem that an excessive force acts on the boom 5 due to an excessive pulling force or a thrust force to deform the boom 5, or one side of the vehicle A is levitated to impair the stability of the vehicle A.

The present invention detects that the rotational driving force of the auger drill 6 has approached a state in which one side of the vehicle A is floated up when a hole is drilled in the ground by a boring column car. It is an object of the present invention to provide a digging column vehicle that regulates the rotational drive of the.

(Means for Solving Problems) A safety device for a digging column vehicle of the present invention to achieve the above object is an outrigger jack capable of grounding by projecting to the left and right sides of the vehicle at the front and rear positions of the vehicle. Together with
A telescopic boom is mounted on the vehicle so that it can be swung and raised and lowered, and an auger drill that can be rotationally driven is hung at the tip of the telescopic boom, and the boom is driven to descend and press the earth drill against the ground. In a digging construction column vehicle configured to make a hole in the ground by rotationally driving an auger drill, each of the outrigger jacks detects when the ground reaction force of the outrigger jack falls below a predetermined level. A detector for controlling the rotation of the auger drill when at least one of the detectors detects the state, and associates the detection means with the auger drill rotational movement restricting means. It is characterized by being configured.

(Operation) The safety device for a digging column vehicle of the present invention having the above-described structure acts so that the pulling-in or thrusting force generated by the propulsive force of the auger drill itself causes one side of the vehicle A to float.
The detector detects that the ground reaction force of at least one outrigger jack of the outriggers has become equal to or less than a predetermined value, and the rotational drive of the auger drill is restricted.
Therefore, it is possible to prevent the boom from being deformed or the one side of the vehicle being levitated to impair the stability of the vehicle when the hole is bored in the ground.

(Embodiment) An embodiment of the safety device for a digging column vehicle of the present invention will be described with reference to FIGS. 1 to 3. It should be noted that reference numerals 1 to 6 and reference numeral A used in the following description are the same as those described in the related art and will not be described.

In FIGS. 1 and 2, 1a, 2a, 3a, and 4a are detections for detecting when the ground reaction forces of the outrigger jacks 1, 2, 3, and 4 are below a predetermined value. It is a vessel. These detectors 1a to 4a are attached to the overhanging beam b of the corresponding outrigger jacks so that the detectors 1a to 4a come into contact with each other when the ground reaction force of the outrigger jacks 1 to 4 becomes substantially 0 and 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 an auger drill rotation motion restricting means. In this example, the auger drill 6 is connected in parallel to a hydraulic motor 6a that rotationally drives the auger drill 6 when energized, and pressure oil for the hydraulic motor 6a is removed. It is configured by a valve configured to bypass the part to regulate its rotation and block the bypass oil passage when not energized so as not to regulate its rotation. The detectors 1a to 4a include an alarm means 7, an auger drill rotation movement restricting means 8 and a power source 9.
And are connected in parallel with each other.

The safety device for a digging column vehicle constructed in this way operates as follows. In a state in which the outrigger jacks 1 to 4 are grounded and the vehicle A is jacked up, the detectors 1a to 4a are disconnected, so the alarm means 7 and the auger drill rotation movement restricting means 8 do not function. From this state, when the auger drill 6 is rotationally driven while the boom 5 is being tilted to make a hole in the ground, at least one of the outrigger jacks 1 to 4 is driven by the pulling force or the thrust force of the propulsive force of the auger drill itself. When one tries to float, at least one of the detectors 1a to 4a comes into contact with the alarm means 7 and the auger drill rotation movement restricting means 8 to operate. Therefore, the operator is advised that the rotational drive of the auger drill is at least one of the outrigger jacks 1-4.
It is possible to know the state before attempting to levitate one by operating the alarm means 7. Also, the auger drill rotation movement regulating means 8
The rotation drive of the auger drill 6 is automatically restricted by the operation of.

In the above embodiment, the warning means 7 and the auger drill rotation movement restricting means 8 are activated when at least one outrigger of the outrigger jacks 1 to 4 is about to fly. Also, the auger drill rotation movement restricting means 8 may be activated long before one side of the vehicle A (the side on which the boom 5 is pointing or the side on which the boom 5 is pointing) floats. . This is because one of the two adjacent outrigger jacks on one side of the vehicle A floats up considerably before the one side of the vehicle A floats in consideration of the twist of the vehicle frame or the like. In such a case, the alarm means 7 or the auger drill rotation movement restricting means 8 may be activated when the ground reaction forces of both adjacent outrigger jacks reach a predetermined value. In this case, as shown in FIG. 3, each of the detectors is provided with two contacts, and the corresponding two detectors of the adjacent outrigger jacks are connected in series, and the series connection circuits are connected in parallel. It may be connected to the power source 9 and the power source 9 and the alarm means 7 and the auger drill rotation restricting means 8.

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.

Furthermore, it goes without saying that the alarm means 7 can be omitted.

Next, the auger drill rotation motion restricting means 8 in the above-described embodiment restricts both normal and reverse rotation motions of the auger drill during its operation. The boom 5 is pushed up by the auger drill 6 when at least one detector of the outrigger jacks corresponding to the same direction side as the boom 5 is activated. Since it is a time when the auger drill 6 is rotated, the reverse rotation of the auger drill 6 is regulated and the forward rotation is not regulated.
Since the boom is retracted by the auger drill 6 when the two detectors are activated, the forward rotation of the auger drill 6 may be restricted and the reverse rotation may not be restricted. With this configuration, when the auger drill rotation movement restricting means 8 operates, the auger drill 6 may be operated so as to rotate in the opposite direction to the side operated before the auger drill rotation movement restricting means 8 operates. You can return to and.

(Effect of the Invention) Since the present invention is configured and operates as described above,
Despite the extremely simple structure, it is possible to prevent the boom from being deformed due to the boom pulling in or pushing up by the auger drill's own propulsion force, or to prevent one side of the vehicle from levitating and impairing vehicle stability. You can

[Brief description of drawings]

1 to 3 are explanatory views relating to a safety device for a digging column vehicle of the present invention, FIG. 1 is an explanatory view of an example of mounting a detector on an outrigger jack, and FIG. 2 is a structure. Explanatory drawing, FIG. 3 is a structural explanatory view of another Example, and FIG. 4 is explanatory drawing of a digging column vehicle. A: Vehicle, 1,2,3,4: Outrigger jack, 5: Boom, 6: Auger drill, 1a, 2a, 3a, 4a: Detector, 8: Auger drill rotation control means

Claims (1)

[Scope of utility model registration request] 1. A front and rear position of a vehicle is provided with outrigger jacks that can extend to the left and right sides of the vehicle and can contact the ground, and a boom is mounted on the vehicle so as to be capable of swinging and hoisting and rotating at the tip of the boom. A digging construction constructed by suspending a driveable auger drill, pushing down the boom to push the auger drill to the ground and rotating the auger drill to make a hole in the ground. In the cart, a detector is attached to each of the outrigger jacks to detect when the ground reaction force of the outrigger jack is below a predetermined level, and at least one of these detectors detects the state. The detection means and the auger drill rotation motion regulating means are associated with each other so as to regulate the rotational drive of the auger drill. Safety device for digging column car.