DE2439002A1 - Cable trench digging machine - has variable plough position and hydraulic control to minimise turning torque on tractor - Google Patents

Abstract

The object is to overcome the turning moment applied to the tractor (2) when the plough (1) for cutting the cable trench is not in line with the tractor longitudinal axis. The force (F) producing the torque (F x a) on the tractor via the support arm (3) can be compensated by off-setting the plough (1) by a small angle (alpha) to produce a quadrature force (F1) and hence a countering torque (F1 x b). Automatic adjustment of these forces is achieved by selecting appropriate diameters for the hydraulic cylinders so that the hydraulic forces (F2, F3) exactly match the applied forces (F, F1), the cylinders being also coupled together hydraulically. With the turning moment cancelled the full power of the tractor is available for trenching.

Description

Description of a cable plow with automatic torque compensation Cable plows of known design are used for the most efficient possible laying of Cables in the ground. There are cable plows that have a pull rope connection with Towing vehicles or winches are connected or coupled directly to a towing vehicle.

With a direct coupling to a towing vehicle, the conditions can go along the cable route require that the Kabelpf coupled to the towing vehicle lug horizontally must be swiveled out.

In the present case, the cable plow (1) is attached to the caterpillar (2), that by swiveling out a longitudinal bar (3) laterally next to this cable in can bring (plow) the ground. Here, the force F takes effect at a distance a from Caterpillar center M and wants to turn the caterpillar (2) clockwise (accordingly the selected representation). Without compensating for this resulting torque the caterpillar (2) only develop a low pulling force. The moment can thereby be balanced be that the cable plow (1) rotated through a small angle alpha to the pulling direction will. This creates the transverse force F1 at a distance b from the center of the caterpillar M attacks and wants to turn the caterpillar (2) counterclockwise. With the right choice of the angle alpha, both moments cancel each other out and the caterpillar (2) can be torque-free develop their full traction.

The correct setting of the alpha angle is especially important when changing Soil conditions (soil classes) must be corrected.

Theoretically, the ratio of F to F1 must always remain constant.

However, this also means that the forces F2 and F3 are always in the same proportion to each other. This is intended according to the invention through this can be achieved that the two cylinders are hydraulically connected (4) and in diameter be dimensioned so that, taking into account all leverage ratios, the forces F and F1 are in the right proportion to each other. The pressure of the in both cylinders enclosed medium (preferably hydraulic oil) will stand up automatically the correct value, as it is generated by the tensile or counterforce F (in the cylinder F2).

Theoretical proof: The caterpillar (2) is torque-free if F xa = F1 xb, so that F1 = F xa A residual torque then acts on the longitudinal beam (3), which is kept in equilibrium by F2 x C. It is thus F2 x C = F xa - F1 xf = F (a - a / bxf) F2 = F (a - a / bxf) C - For the plow lateral control, F1 xd = F3 xe because F1 = F xa results b F3 = F xaxdbe The area ratio of the cylinders (piston areas) F2 and F3 becomes

Claims (2)

P a t e n t a n s p r ü c h e U Cable plow with automatic torque compensation characterized in that the two cylinders for pivoting and transverse steering of the longitudinal beam (3) or cable plow (1) hydraulically connected (4) and completed are. 2. Cable plow characterized by automatic torque compensation, that the diameter (taking into account all leverage ratios) of the cylinders for swiveling and lateral control are dimensioned so that when swiveled to the side Longitudinal beam (3) with plow body (1) no torque acts on the caterpillar (2). Blank page