Patent GB-906931-A (GB)
Title: Winning arrangement for mining
IPC: E21F13/06
Filed: 1959-08-17
Abstract: 906,931. Mineral mining apparatus. HIPPEL, H. J. VON. Aug. 17, 1959 [July 30, 1959], No. 28057/59. Class 68 (1). A winning-machine, e.g. a coal plane, is guided back and forth on the longitudinal side of a conveyer, and the drives of the machine and the conveyer are coupled through control devices which vary the speeds of the machine and the conveyer so that their outputs are maintained in correct relation. Fig. 1 shows a fluidpressure (oil) motor 1 driving a conveyer 2 and a fluid-pressure motor 3 driving the traction chain 4 of a coal plane. Electric motors 5, 6 drive main pumps 7, 9 and auxiliary pumps 9, 10, respectively. The main pumps 7, 9 drive the motors 1, 3, respectively, and the two outputs of the auxiliary pumps 9, 10 are applied according to the setting of change-over devices 15, 11, one output to each motor 1, 3; or two outputs to one or other of the motors 1, 3. The devices 15, 11 may be operated according to pressure variations in the conduits 12, 14, so that as the pressure in one of the conduits rises due to overloading of the associated motor 1 or 3, the devices 15, 11 operate to divert the output of another auxiliary pump to that motor. The relative speeds of a coal plane and conveyer are alternately adjusted during the downhill and uphill runs of the plane, i.e. the plane is driven faster uphill than downhill, and the conveyer is driven slower during the uphill run of the plane. To prevent hunting, the pressure-sensitive control means should be supplemented by time relays, and to avoid this, in the arrangement shown in Fig. 2, heat-sensitive elements 18, 19 in the conduits 12, 14 are influenced by heat engendered in an overworked motor 1 or 3 to move a slide valve 21 which diverts part of the supply to the motor 3 to a motor 22 which drives a cooling machine 23 for cooling oil in the sump 25 through a heat-exchanger 24. The supply to the motor 3 is thus lessened and the coal plane works slower. The slide valve 21 is also worked by an over-pressure emergency valve 20. The motors 1, 3 are provided with cooling channels. In Fig. 3, the main and auxiliary pumps 9, 10 are both connected to the motor 3 of the coal plane, during the uphill run, and the pump 7 is connected to the motor 1 of the conveyer. An auxiliary pump 8 is not provided, but a cooling-machine 23 is driven by the motor 5. During the downhill run of coal plane, the pump 9 is connected to both of the motors 1, 3. The change-over of oil-connections is effected by members in the path of stops on the coal plane at the ends of its stroke. In Fig. 11, the coal plane 4 is driven by a motor 3 and the loading on the conveyer 2 produces a proportionate pressure in a tensioning cylinder or cylinders 26. If the loading on the coal plane 33 increases, the pressure in the line 29 increases. A governor 30 maintains in the line 28 a pressure inversely proportional to the pressure in the line 29, so that the increased load on the plane results in a decrease in the pressure in the feed cylinders 27 and thus a lightening of the cut. Similarly, an excess load on the conveyer results in a rise in the pressure in the cylinder 26 and, through the inverse governor 31, a decrease in cutting depth.