JPH073838A - Excavator for deep groove into ground with assistance of milling drum - Google Patents

Abstract

PURPOSE: To enhance work performance by providing a guide stop on an upper part of a chassis having a milling drum provided on a lower part and expanding this at excavation, so as to elongate effective length and contracting it at transporting. CONSTITUTION: A guide stop 4, having a thickness same as that of a rectangular parallelepiped chassis 1, is secured on an upper side end of the chassis 1. The stop 4 is supported by a tube 6, moved vertically by a hydraulic thrust cylinder so as to enable expansion and contraction of the stop 4 in the vertical directions with respect to the chassis 1. In the case of excavation of a trench, the chassis 1 is lowered to execute excavation of the trench, and at the same time the stop 4 is slid so as to guide the chassis 1, while the stop 4 is being expanded. At transportation and the like, the top 4 is contracted so as to reduce height. By this constitution, perpendicularity of the trench is improved, and size is reduced for transportation without having to disassemble an apparatus.

Description

Detailed Description of the Invention

FIELD OF THE INVENTION The present invention relates to a device for digging deep trenches in the ground with the aid of a milling drum.

2. Description of the Prior Art It is already known to provide a device with a chassis that uses a cable to support a milling drum suspended on the mast of a ritting machine. These milling drums are rotationally driven in opposite directions to cut open areas and dig trenches while the chassis digs down the land. This type of device is generally capable of grooving to a depth of a few tens of meters, and the depth is about 1
It can reach up to 50 meters. As such a device descends into the ground, it is necessary to ensure the correct positioning of the chassis so that the grooves produced have good vertical walls. It is known to control the deflection of the chassis by producing a rotational speed difference between the milling drums in a direction perpendicular to the axis of the milling drums.
By contrast, in the direction parallel to the axis of the drum, the position of the drum is guaranteed mainly by the chassis, whose thickness is
It corresponds to the width of the groove already dug and holding the drum. However, it requires a compact device to be transported by road without disassembling, which leads to insufficient guides when low height chassis must be made.

SUMMARY OF THE INVENTION An object of the present invention is a device for making a deep groove in the ground, of the type which comprises a chassis with a milling drum at the bottom, the chassis being at the top of it. Displacement during operation of the device between an upper position that increases the effective length of the chassis and a lower retracted position that reduces the overall size of the chassis when the device is being transported. It is characterized by having at least one guide stop that is possible. In a preferred embodiment of the invention, two guide stops are arranged, each having substantially the same thickness as the chassis, at the lateral edges of the chassis. Each guide stop is telescopically mounted so that it can be placed in a high or low position. These two guide steps are preferably activated simultaneously. These guide stops are sufficient so that, between them, the pulley blocks supporting the chassis and the various pipelines necessary to ensure the operation of the milling drum can be placed therein. It has the advantage of leaving a large free space. In a preferred variant of this embodiment of the invention, each guide stop is
It is supported by a tubular component that slides inside a correspondingly shaped orifice made in the chassis body,
In contrast, a hydraulic thrust cylinder, one side of which is firmly fixed to the chassis and the other side of which is firmly fixed to the tubular part, is housed in the tubular part. In order to prevent rotation of the guide stop around the tubular part, a slideway is arranged which is fixed to the stop and which preferably has a U-shaped cross section, which is fixed to the chassis. Slide between the two plates. In another variant, it is possible to ensure the upper or lower position of the guide stop with the help of any means outside the chassis, while suitable blocking means hold the stop in the upper and lower position. . In another embodiment of the invention, the displaceable guide stop has substantially the same thickness as the chassis,
And consists of elements that extend substantially to the side edges of the chassis, the stops being attached to the chassis by retractable elements that can be raised during operation of the equipment and lowered during transportation of the equipment. It is connected. In this case, the central part of the elements forming the guide stop contains at least one orifice for the passages of the various flexible pipelines, which pipelines are used for the operation of the milling drum and the lifting of debris. It can transmit necessary energy. The guide stops are displaced by one or more hydraulic thrust cylinders or electrical devices incorporated into the chassis. Of course, as in the previous embodiment, it is possible to operate the guide stop with the aid of means external to the chassis, for which suitable blocking means hold the stop in the high or low position. To do. The results of experiments carried out by the Applicant's company show that despite the enormous forces and vibrations that the chassis is subjected to, the retractable guide stop according to the invention is able to fulfill these roles correctly. The device behaves like a device containing a higher height chassis.

For the purpose of facilitating the understanding of the invention, reference is made to the one drawing, which is a perspective view of a device according to a preferred embodiment of the invention, without limiting the scope of the invention. The embodiment name given by will be described.
The metal chassis 1 has a substantially right-angled parallelepiped shape with a hollowed out central portion 2 for accommodating the various members required for its operation. A flexible pipe, not shown, allows the debris to rise, and a flexible pipeline, not shown, supplies energy to the chassis. Advantageously, the pipes and their pipelines have a chassis 1 open in a central recess 2.
Through the orifice 3 formed in the upper part of the. In addition, the chassis 1 has at its bottom two milling drums (not shown) that can be grooved.
g drum). According to the invention, the chassis 1 is provided with two guide stops 4 on its upper part, each of which is telescopically mounted on the lateral end of the upper part of the chassis. In the case of this case, fixed runner 5
Cover the outer surface of each stop 4 and are in contact with the walls of the groove during the trenching operation to facilitate sliding of the stop within the groove as the chassis descends. A runner 5'of the same type is rigidly secured to the bottom of each of the two large faces of the chassis to facilitate its displacement within the groove. In the known manner, each runner 5, 5'extends vertically by a chamfer 5a, which is intended to limit the risk of the chassis being locked in the groove. According to the invention, each stop 4 has the same thickness as the chassis 1 in order to hold it on the groove wall so that it can be guided. In the illustrated embodiment, each stop is supported by a tubular piece 6 that is slidable within a correspondingly shaped orifice 7 provided in the chassis body. A hydraulic thrust cylinder, not shown, is housed inside each tubular part 6 and is secured to the chassis 1 on one side and to the tubular part 6 on the other side to secure each stop 4 to each stop 4. Give a displacement. In order to prevent each stop 4 from rotating around the longitudinal axis of the tubular part 6 to which it is attached, a slideway of U-shaped cross section is firmly fixed to the stop 4, and It can slide between two end flanges 9 of the chassis which extend over the entire height of the lateral ends of the chassis. It is understood that the device according to the invention has a variable effective length, depending on whether the guide stop 4 is placed in the high position or in the low position. Thus, the effective length of the device can be increased when making the groove to improve the guide of the chassis, or this length can be decreased when the device is displaced from one position to the other, and this Allows disassembly of the device to be avoided.
It is clearly understood that the embodiment just described does not have limiting properties and can be modified in any way desired without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view of a device according to a preferred embodiment of the present invention.

[Explanation of symbols]

 1 Chassis 4 Guide stop 6 Tubular member 7 Orifice 8 Sliding path

Claims (5)

[Claims] 1. A device for making a deep groove, of the type having a chassis with a milling drum in the lower part, wherein the chassis (1) increases the effective length of the chassis (1) during operation of the device. At least one guide stop (4) displaceable between the upper position and the lower retracted position, which reduces the overall size of the chassis (1) when the device is transported. )
An apparatus comprising: 2. Two guide stops (4) each having the same thickness as the chassis (1), and these guide stops (4) being substantially lateral edges of the chassis. The apparatus of claim 1, wherein the apparatus is located at. 3. Each guide stop (4) is supported by a tubular piece (6) sliding in a correspondingly shaped orifice (7) made in the body of the chassis (1), On the other hand, the hydraulic thrust cylinder having one side firmly fixed to the chassis (1) and the other side firmly fixed to the guide part (6) is housed in the guide part (6). The device according to. 4. Further, it preferably has a U-shaped cross section, which is fixed to each guide stop (4) and slides between two plates (9) fixed to the chassis (1). Device according to claim 3, comprising a sliding path (8) which is open. 5. A guide stop, comprising a element having substantially the same thickness as the chassis and extending substantially to a lateral edge of the chassis, said element having a central portion in its central portion. The apparatus of claim 1 comprising at least one orifice for passage of flexible pipelines and cables.