RU94000741A - TRAILER TRACTOR - Google Patents

Claims (1)

The invention relates to logging machines, mainly to the skidders, and can be used in the forest industry. The aim of the invention is to improve the performance characteristics of the skidder tractor during acceleration by automatically triggering the rider to move when the tractor starts up. This goal is achieved by installing a system of electro-hydraulic control of the hydraulic movement of a conic, equipped with sensors associated with the transmission control slider. The skidding tractor contains a self-propelled chassis, including longitudinal guides, on which a carriage is installed with the possibility of reciprocating movement. On the last one, a turntable with a conic is fixed through the bearing. The platform is driven by hydraulic cylinders for turning it together with a timber package. The hydraulic actuator includes a pump 8 connected by a suction hydroline to the tank 10 and the pressure hydroline 11 via an electrically-controlled distributor 12, and the hydraulic line 13, 14 with parallel-connected hydraulic cylinders. In the neutral position of the distributor, the first pressure line 11 is connected with the pump 8, the second with the drain into the tank 10, the third 13 with the piston cavities of the hydraulic cylinders, and the fourth 14 with the rods, and all lines are locked. In the first position of the distributor 12, the first pressure line 11 is connected with the fourth 14, the third 13 - from the second, and in the second (floating position) - all lines communicate with each other. The switch 15 of the operating mode of the distributor 12 with electrical contacts 16-18 controls the distributor 12 from the tractor cab by turning on the corresponding electromagnet 19 or 20. The skidding tractor is equipped with a motion sensor 21 with normally open electrocontacts 22, 23 and two limit switches 24, 25, respectively switched on the end of the forward and reverse stroke of one of the hydraulic cylinders. Limit switch 24 is made four-contact with electrical contacts 26 - 29 and unlocking the on position using an electromagnet 30, and switch 25 - a two-contact with electrical contacts 31, 32. The motion sensor is activated from the chassis 33 of the transmission control. The hydraulic actuator can help the loaded tractor turn when slipping the running track, as if pushing the tractor out from under the tree pack by supplying the working fluid to the hydraulic cylinder rods from the carriage position shifted back along the tractor carriage by switching the control signal by switch 15 from electrical contacts 16, 18 to electrical contacts 16, 17, alternately including electromagnets 19 and 20. The economic effect is achieved by improving the dynamics of tractor acceleration and facilitating the rotation of the tractor. 3 il.