DE1037985B - Heat exchanger for the circulating coolant of the drive device of a mining drill - Google Patents

Description

GERMAN

The invention relates to a heat exchanger for the circulation cooling liquid of the drive device a mining drill for coal od. Like. With a conveyor with a base plate for the recovered goods or other devices. Such a device is known.

Mining drilling machines have recently become known (see British patent specification 672 403), which have rotating knives which are mounted on the front of a frame which is on caterpillars is progressively advanced into the borehole thus produced. The funded material (Coal) is conveyed to a conveyor via discharge devices and continuously afterwards Backwards carried away.

The conveyor usually consists of a horizontal trough in which the lumpy material by Ouerstege, which od on an endless chain. The like. Is conveyed.

The drive motors and gears of such a machine are generally with the help of a Cooling liquid cooled, which passes through a heat exchanger, which in turn, the Machine absorbed heat can release to the surrounding air '. Such heat exchangers are but not entirely satisfactory, because of the increased temperature of the air, the spatial restriction and the fact that the air ducts around the cooling tubes can easily be penetrated by particles of the add recovered material.

The present invention is based on the observation that coal seams in virtually horizontal Location, which through tunnels opening into sloping terrain, as described by a drill of the above Species would be obtained, are accessible, generally a relatively low one, have a constant temperature, and that the extraction of coal by mechanical means keeps its temperature just raised a little, maybe a degree or two.

The invention therefore aims to provide a heat exchanger for the L ^T mlauf-cooling liquid of the drive device of a mining drilling machine for coal or the like, which is combined with a conveyor which can convey lumpy material along a base plate. According to the invention, the bottom plate of the conveyor is provided with longitudinal channels and transverse channels, which are connected to the liquid cooling system, for the flow of cooling liquid, so that the heat of the cooling liquid can be dissipated through the bottom plate to the goods being conveyed thereon.

The channels are expediently through pipes welded to the underside of the base plate Heat exchanger for the circulating coolant

the drive device of a mining drill

Applicant:

Union Carbide Corporation, New York, N.Y. (V. St. A.)

Representative: Dipl.-Ing. H. Görtz, patent attorney, Frankfurt / M., Schneckenhofstr. 27

Claimed priority: V. St. v. America May 26, 1954

George Theodore Feibeck, Wernersville, Pa.,

and John Thomas Bowen, Pasadena, Calif. (V. St. Α.),

have been named as inventors

Od. Like. Formed, the z. B. consist of angle iron with their free longitudinal edges to the bottom are welded to the base plate, the enclosed by the legs of the angle iron and the base plate, ζ. B. triangular space forms the channel. This embodiment of the channels is shown below among other things by simplicity as well as by great mechanical resistance, which is mainly for a mining drill is particularly advantageous. Heat exchangers with plates and welded to them Pipes, including those made from angle iron, are per se, but not for having over the upper surface of the Moved plate, the heat from the coolant flowing through the channels absorbing, lumpy Material to be conveyed, in particular broken coal, is known (see Swiss patent specification 223 394 and German Patent 514 550).

Further features of the invention are evident from the illustrations of an exemplary embodiment and from FIG can be seen in the following description. It shows

Fig. 1 is a horizontal partial section of a coal seam with a mining drilling machine illustrated in plan according to the invention in a borehole produced by this in the seam, and

Fig. 2 is an enlarged partial view in cross section along the line 2-2 of FIG. 1 with details of the un-

S09 600/1

Claims (2)

conveyor located indirectly behind such a machine. As illustrated in Figure 1, the mining boring machine 10 is provided with four face cutters 12 which are driven by motors located within the machine. During the operation of the knives 12, the entire machine is moved by caterpillar chains 14 which support the machine against the bottom of the borehole 16 being created, these chains also being driven by motors provided inside the machine. Only one drive motor 18 is illustrated as an example. Such an engine tends to get very warm during operation, but is effectively supported by an appropriate liquid, such as e.g. B. oil supplied from a container 20 carried by the machine is cooled. The oil is set in circulation by a pump 22, which is driven by the same motor 18 via a circulation system which has an inlet pipe 24 connected to the container and an outlet pipe 26 which is connected to the heat exchanger 28, furthermore a return line 30 for the cooled oil, which leads from the heat exchanger back to the oil cooling ducts connected to the engine 18, and a pipe 32, which leads the relatively hot oil back to the container 20. The circulatory system also has a filter 34 in line 30 to keep the oil clean. The heat exchanger 28 according to the invention comprises a portable conveyor 36 which, in the illustrated embodiment, is attached to the rear of the machine 10 for the continuous forwarding of the coal 38 produced by the machine backwards through the borehole 16. The coal conveyor has a metal base plate 40, such as shown in Fig. 2, on which the coal 38 by cross members 41, the ends of which are connected with endless chains 44, is advanced. These chains are guided by appropriate chain wheels between side frames 46 and driven in synchronism by a suitable motor 47 (FIG. 1). On the underside of the base plate 40 several spaced parallel channels are welded, the opposite ends of which are connected by transverse channels 48 in such a way that the oil flows back and forth under the base plate 40, whereby it is cooled by the heat flowing through the base plate 40 is transferred through directly to the coal 38 while the latter is moved along and is in contact with the surface of the bottom plate 40. In particular, the oil enters at one end of the channel, flows through the channel for its entire length, and is returned to its low temperature source. The illustrated channels are formed in that angle irons of V cross-section are welded to the base plate, so that a kind of coiled pipe is formed. However, other means can also be used, e.g. B. a line or pipe welded to the plate or a double plate, in order in this way to establish thermal contact between the circulating liquid and the plate surface. There is also no need to use a continuous, single-lane queue, since several parallel lanes can just as easily be used. The coal is advanced along the top surface of the bottom plate by movement of the chains and cross links. The limbs and consequently the coal move in this case at a speed of approximately 30.5 m / min, i. H. quite fast. The returning chains and links move below the plate and cooling coil. A blanket of moving charcoal forms on the plate, the size of which varies from small particles to chunks about 15 cm in size. The contact time, which in the case of the embodiment is approximately 9 seconds, varies according to the speed of the conveyor and the length of the plate. This time is sufficient to allow a certain amount of heat to flow away from the plate to the coal particles. Practical tests have shown that, with uninterrupted conveyance of the coal, the temperature of the coal mass and the contact time are such that they allow a useful rate of heat transfer and consequently also an appropriate temperature drop in the liquid flowing through the cooling channels. Depending on the ambient conditions, additional heat is radiated and conducted away from both sides of the base plate. The invention is not limited to the mining drilling machines, but is also suitable for other material treatment devices. Patent α χ s ρ r v c ii ε: 1. Heat exchanger for the circulating coolant of the drive device of a mining drilling machine for coal or the like with a conveyor with a base plate for the material obtained or other devices, characterized in that that the bottom plate (40) of the conveyor with longitudinal channels (48a) and transverse channels (48). which are connected to the liquid cooling system, provided for the flow of cooling liquid is so that the heat of the cooling liquid carried through the bottom plate to that on it Can be derived well. 2. Heat exchanger according to claim 1, characterized in that the channels on the underside the base plate (40) with their longitudinal edges are welded angle iron or pipes. Considered publications:
German Patent No. 514 550;
Swiss Patent No. 223 394;
British Patent No. 672 403. 1 sheet of drawings © SOi 600/1 9.58