FR2477626A1 - ELECTRICAL CONTROL DEVICE FOR UNDERGROUND MACHINES FOR THE EXTRACTION OF ORES, SIZE-CONTAINING BANDS, AND / OR SIZE-CONTAINING ELEMENTS OR THE LIKE - Google Patents

Abstract

ELECTRICAL CONTROL DEVICE FOR UNDERGROUND MINERAL EXTRACTION MACHINES, SIZE CONVEYOR BELTS AND SIZE SUPPORT ELEMENTS, OR SIMILAR. IT INCLUDES AT LEAST ONE ORDERS RECEIVER (ELECTRONIC SWITCHING DEVICE 9 WHICH IS CONNECTED THROUGH AT LEAST ONE ELECTRIC LINE 14 TO A DEVICE 15 CONVERTING THE ELECTRIC CURRENT FROM THE SIZE LIGHTING (LAMP 17) TO VALUES PRESENTING INTRINSIC SAFETY.

Description

Electrical control device for mechanical machines

  terraines for the extraction of ores, transpor-

  The invention relates to an electrical control device for generating, transmitting or converting intrinsically safe control pulses for underground ore extraction machines. , size conveyor belts and / or supporting elements in size, or the like, and comprising at least

an order receiver.

  In the field of size engineering, it is known how to use one or more control devices for controlling, for example, retaining elements, these devices being for example in the form of command receivers which direct the retaining work according to a more or less automatic succession. Because of the danger of explosion that exists in underground mines, it is essential that the supply lines that are connected to these command receivers are intrinsically safe. In general, a current with an intensity of 1 A and a voltage of 12 V is chosen. Because of these values, which are relatively low, it is found, when the supply lines have a certain length, losses that are so great that the it is no longer assured of the reliable operation of the receiver or receivers of orders concerned

  other control devices, such as electro-

Intrinsically safe valves.

  It is true that we could solve this problem by

  converting the voltage and power of the power supply

  depending on the corresponding line sections. But it has been found that this presents drawbacks because the transformers used must be on the one hand accessible and on the other hand protected, which is difficult because of the limited space existing in the size and the already large number

existing lines.

  The object of the invention is to simplify a control device of the type described in the preamble. This problem is solved by connecting the command receiver (electronic switching device) via at least one electrical line to a device converting the electric current of the lighting of the size (lamp) to values having a intrinsic safety. When one resorts to a

  control device in accordance with this teaching, the energy

  electrical energy required for the receiver (s) of orders is taken from the existing lighting in the size, this current thus withdrawn being converted into an intrinsically safe value, which guarantees the operation of the order receiver (s) with intrinsic safety. According to the invention, this eliminates a particular power supply line that would be necessary for the command receivers. In addition, electrical energy is taken from the lighting of the waist, which in any case

  must exist, and in this case the connection to

  lighting of the size is achieved by means of a

  relatively short line. In addition, it is possible to

  reliably connect several command receivers to

  means of intrinsically safe currents of various values.

  According to the invention, the transformer device is mounted inside the housing of the lighting lamp of the size which is protected against firedamp. This is advantageous

  because it is no longer necessary to resort to

  peculiarity against firedamp for the transformer device. This device which is mounted in the housing of the lamp is protected not only against firedamp but also against other damage that can be inflicted. Advantageously, the command receiver is constituted in the form of an electronic switching device associated with one or more support frames. A series of orders can thus be processed with only one line connecting the lighting of the size to the order receiver, which makes it possible to control a series of maneuvers, for example

  example via safety solenoid valves.

  intrinsic. According to the invention, it is provided that the instructions are transmitted to the single or to the various command receivers according to a method that does not use current. Thanks to this arrangement, it is possible not only to suppress specific power supply lines, but also an electric command line for transmitting orders. It is clear that this brings an important additional simplification to the installation from the point of view of the intrinsic safety requirements of the power lines. The command receiver or electronic switching device is connected to a fiber optic line

  conductor of the light, or control line by which

  the are transmitted instructions. This allows for

  simultaneously put a series of orders and the transmission is carried out without problems as regards the other receivers of orders. In this case, there is no undesirable receipt of orders by other receivers, which is possible under certain circumstances when

  use for example a radio remote control.

  Advantageously, with regard to the size illumination lamp comprising a firedamp protected box, there is disposed inside the housing a device which is connected to the lighting line of the size and which converts the current of lighting in values having an intrinsic safety, device to which can be connected a line passing through the casing. This provision has an inventive character that goes without saying. This results in a size-protected lighting lamp that is protected and by means of

  which a device according to the invention can be

  and obtain the advantages of the invention. Although the size illumination lamp according to the invention comprises a

  transformative device, it is characterized

  its compactness, its protection against firedamp and naturally also against other

  damage which also applies to the transforming

  sumer. It is also possible, for a minimal expense, to mount a transformer device in standard size lighting lamps, and also to pass a line and

  thus obtain a size lighting lamp according to the in-

vention.

  We will now describe in more detail and as an example

  an embodiment of the invention with reference to

attached drawing.

  This drawing is a diagrammatic view from above of several support frames 1 to 6 shown diagrammatically and arranged next to each other, the direction

  length of the waist being indicated in 7 and the direc-

exploitation in 8.

  Support frames 1 to 3 and 4 to 6 are

  gathered in control groups. The displacement of these groups is respectively controlled by an electronic switching device 9 which transmits the commands via a control line operating without current 11 such as a line of optical fibers. An optical fiber line makes it possible simultaneously to transmit a series of commands which are detected and selected by the electronic switching device 9 and retransmitted via other lines 12 to control devices such as safety solenoid valves. which control the movements of the retaining elements and possibly also the extraction device which is not

not represented.

  The current required for the electronic switching device 9 is taken from the power line 13 which supplies the illumination of the size. To obtain this result, the electronic switching device 9 is connected by a line 14 to a device 15 connected to the line 13 and whose function is to convert the current flowing in.

  line 13 into values presenting an intrinsic safety

  Sequé. The device 15 is mounted in the housing 16 of the size 17 lighting lamp which is the closest. The branch line which is connected to the device 15 is also provided in the casing 16 of the size illumination lamp and the line 14 which starts from the device 15 crosses

  the housing 16 on the rest of its course.

2477S2 6

Claims (6)

  1. Electrical control device for generating   deriving, transmitting or converting intrinsically safe control pulses for underground ore mining machines, sized conveyor belts and / or size support members, or the like, and comprising at least one command receiver, characterized in that the command receiver (electronic switching device 9) is connected via at least one electrical line (14) to a device (15) converting the electric current of the lighting of the size (lamp 17) at values presenting intrinsic safety.   2. Control device according to claim 1, characterized in that the transformer device (15) is mounted inside the housing (16) of the lighting lamp   of size that is protected against firedamp.   Control device according to Claim 1 or 2, characterized in that the command receiver is constituted as an electronic switching device (9).   associated with one or more support frames (1 to 6).   Control device according to Claim 3, characterized in that the instructions are transmitted to the electronic switching device (9) according to a method not using electricity.   5. Control device according to any one of   preceding claims, characterized in that the receiver   controller (electronic switching device 9) is connected to a line of light-conducting optical fibers (control line 11) through which are transmitted the instructions.   6. Size illumination lamp comprising a housing protected against firedamp, characterized in that inside the housing (16) there is a device (15) which is connected to the lighting line (13) of the size and which converts the lighting current into intrinsically safe values, to which a line can be connected (14) passing through the housing.