FR2479544A1 - ELECTRICAL CABLE COMPRISING A PROTECTIVE SHEATH FOR ELECTRO-HYDRAULIC CONTROL OF SUPPORT ELEMENTS IN MINING EXTRACTION WORK - Google Patents

Abstract

ELECTRIC CABLE PROVIDED WITH A PROTECTIVE SHEATH AND INTENDED FOR THE ELECTRO-HYDRAULIC CONTROL OF SUPPORT ELEMENTS IN UNDERGROUND MINING EXTRACTION WORKS. THE ELECTRIC CABLE 10 IS PROVIDED INSIDE A HYDRAULIC PRESSURE PIPE 13 CONSTITUTING THE PROTECTIVE SHEATH AND WHICH INCLUDES AT ITS END A COUPLING ARMATURE 16 OF A SHEATH COUPLING DEVICE 14 CONSTITUTED IN A WAY KNOWN IN ITSELF AS A PLUG-IN COUPLING DEVICE.

Description

The present invention relates to an electric cable for

  protective sheath and intended for electro-hydraulic control of ele-

  retaining elements in underground mining works.

  Used in hydraulic and electronic controls

  hydraulics of retaining elements and for hydraulic supply

  or the hydraulic control of the various working cylinders of the ducts or pipe-

  resistant to hydraulic pressure to which pressure is applied

  high operating or operating pressures of between about 200 and 500 bar

  which are sealed and tensile-resistant by means of ac-

  suitable couplings such as plug-in couplings (these elements are hereinafter referred to as "pressure hoses"). Pressure hoses are used either individually or bundled together

  in a sheath forming envelope and shielded. In the latter case, the coupling

  multi-duct ducts shall be effected by means of

  multiple pluggable coupling (German publication DE-AS 20 59 576).

  In addition, when it comes to electro-hydraulic controls

  such as they are intended for the underground control of retaining elements, it is necessary to have in the size, in addition to the pressure pipes

  hydraulic systems, low-voltage electric cables to supply electricity

  three-door control devices and to make it possible, from the central control station of the size, the electric control

  when using an electronic control device

  ticular. It goes without saying that in consideration of the severe working conditions

  that we meet underground, we can only use shielded cables.

  For this purpose, for example, sheathed cables surrounded by a guiding

page of steel wires.

  The large number of pressure hydraulic lines and electrical cables required for the control of retaining elements, as well as their couplings and their electrical connections, leads to

significant expenses.

  The object of the invention is above all to propose an electric cable, and in particular a low current cable intended for

  electro-hydraulic control of retaining elements in

  land, by means of which one is assured on the one hand a reliable protection

  electrical cable against external aggression, and on the other hand a reduction

  costs of manufacturing and assembly.

  According to the invention, this problem is solved by the fact that the electric cable is arranged under a hydraulic pressure sheath

  constituting a protective envelope, which sleeve comprises at its end

  mating a coupling armature for a coupling device of

  plug-in sleeves, known per se.

  According to the invention, the envelope is

  -5 external pe drivers or electrical cables of hydrau-

  conventional and standard type liquefiers, and as used primarily in high pressure hydraulic systems for underground hydraulic controls of retaining members and the like, and

  which generally operate at pressures between 200 and 500 bar.

  As a result, it is possible to use, in the case of

  Realistic, inexpensive and unshielded cables of the type available

  on the market, and as protective sheaths for pressure hoses re-

  and also available on the market and as they are usually

  used in hydraulic retaining systems. It is advantageous to use, to form the protective sheath, pressure pipes whose nominal diameter is greater than that of the cables. The cables can therefore be inserted without difficulty inside the hydraulic hoses. They

  have sufficient freedom of movement inside the pressure hose.

  this makes it possible to connect them electrically and easily at one end, even when the pressure pipes are to be laid with elbows

more or less pronounced.

  Because we use to make the protective envelope

  electrical cables of hydraulic hoses, the dimensions of which are

  standardized, it is also possible to use for the mechanical connection

  pipes of known mating reinforcements in the form of

  of plug-in coupling devices. With the help of the coupling

  mounted at the ends of the pressure sheaths, a leak-proof and otherwise leak-proof connection of the sheath pipe is obtained.

  cable protection with, for example,

  specificity for the controls of the supporting elements. To make

  the coupling of the sheath is used, in this case the quick and known coupling provided for the hydraulic systems, in the form of

  plug-in coupling devices in which the parts of the

  The interlocking cable can be connected to resist traction by avoiding a screw connection and advantageously by means of a plug-in fork or a U-shaped connection. The insulated electric cable can be introduced. axially in the closed coupling device of ducts. This allows to realize by

  a connection with a housing in which the pressure pipe is closed

  connected to the housing of a tensile material by means of the duct coupling device, while the electric cable is introduced

  in the housing through the closed coupling device and is connected to

  S electrically at the place provided.

  On the other hand and according to the invention, the coupling of

  the sheath can also be constituted simultaneously in the form of a coupler

  electrical connection and preferably a plug-in coupling or the like.

  The coupling element of the sheath which is mounted at the end of the sheath

  then comprises an electrical connection element to which can be connected

  electrically dice the wires of the cable. It is advantageous that the

  electrical connection is connected in a removable manner to the

  duct coupling, which facilitates the manufacture of electrical connections

  and also provides the possibility of using coupling frames

  Conventional couplings for the cladding of the sheath, which are in this case simply equipped with the electrical connecting element establishing the electrical connection. The electrical connection element is advantageously arranged in the internal bore of the coupling element concerned of the duct coupling device. It is preferably mounted freely in rotation in

  the internal bore of the coupling element so as to facilitate the

  the electrical connection and to avoid possible twisting of the electrical cable

  cudgel. In addition, the electrical connection element may be constituted by a simple plug-in element provided for example with electrical plugs,

  female connectors or any other elements establishing the electrical connection.

  According to another development of the invention, it is pos-

  sible to constitute the assembly so that the pressure pipe in which is placed the electric cable is subjected to an internal pressure by means of a pneumatic or hydraulic pressure fluid. The pressure fluid can be

  a shielding gas or a fluid used for controlling or feeding

  user device. In the latter case, the pressure pipe serves not only as protective sheath for the electric cable, but also

  driving for the pressure fluid.

  In addition, the device according to the invention may be such

  that the pressure sheath in which the electric cable is placed is

  staggered by a sheath, or conduit of a bundle of pipes, arranged in a flexible envelope sheath. In this case, at least one pipe of the pipe bundle can be used for transmission of the pressure fluid while at least one other pipe of the bundle of pipes receives an electric cable. Sheath

  the bundle can then be coupled by means of an

  multiple coupling and plug-in known.

  The invention will now be explained in more detail by means of exemplary embodiments and with reference to the accompanying drawings, in which: FIG. 1 represents an electric cable provided with

  the protective envelope according to the invention, as well as a coupling device

  duct construction in the form of a plug-in coupling;

  Figures 2 to 4 show other examples of reali-

  tion of the invention, presented in the same manner as in Figure 1; Fig. 5 is a sectional view of a pipe bundle provided with a multiple plug coupling device, at least one pipe of the pipe bundle serving as protective sheath for an electric cable; FIG. 6 is a sectional view of the complementary coupling element of the multiple plug coupling device of FIG. 5.

  According to the drawing, reference numeral 10 designates an electrical cable

  than conventional type provided with an insulation, such as a low current cable, which is used for example for the electrohydraulic control of retaining elements. The two wires of the flexible cable 10 are designated

  at 11 and 12. The cable 10 has for example a diameter of 8 to 10 mm.

  The protective sheath of the cable 10 is constituted by

  a pressure pipe 13 of the usual type in hydraulic pressure systems

  lic. This hydraulic pressure pipe, which is applied in pressure retaining systems of at least 200 to 500 bar, usually comprises in the rubber or rubbery material of the pipe, a yarn fabric

  of steel or the like drowned inside. The nominal diameter of the pressure hose

  13 is at least 1 to 2 mm greater than the thickness of the electric cable 10.

  As a result, the cable can easily be inserted into the end of the

  pressure pipe 13 and pass it through this pipe.

  At the end of the pressure pipe 13 is fixed a coupling element 14 belonging to a duct coupling device known per se. The coupling element 14 is firmly connected to the pipe 13, for example by means of a clamping sleeve 15. It comprises a plug-in head 16 carrying an O-ring 18 mounted in an annular groove 17. At a distance

  at the rear of the O-ring 18 is provided a 19-groove of semicircular shape.

  re. The complementary coupling element 20 of the plug coupling device which is constituted by a female part or a sleeve or the like is fastened for example to a housing 21 by means of a connection

  22. It comprises an internal multi-tiered bore 23 which

  has a groove 24 of semicircular shape. To connect the pressure hose

  13 to protect the cable 10 to the housing 11 and to withstand traction, the plug-in head 16 of the control element

  coupling 14 danced the internal bore 23. Then, and in a known manner, is introduced

  externally a U-shaped connection 25 in the grooves 19, 24 facing each other, which blocks the coupling, the coupling element then being secured to its counterpart 20 in a safe and tensile-resistant manner . The O-ring 18 constitutes the internal sealing member of the plug-in coupling. We do

  pulling the electrical cable 10 from the front of the axial bore of the feed element

  coupling 14 and is introduced without interruption into the bore 23 and into a narrower bore 23 'of the corresponding plug element 20 in the

  box 21 in which its conductor wires 11 and 12 are electrically connected.

at appropriate locations.

  In the embodiment of FIG. 2, the arrangement

  Duct coupling coupling 14, 20 also serves as an electrical coupling by which the conductor wires 11 and 12 and 11'-and 12 'of the cable sections

  and 10 'are electrically connected. The plug-type coupling element

  In this case, the cable 14 is provided with an electrical connection element 26 which is inserted into the axial internal bore 27 as an additional element and is held stationary in the axial direction by gluing or pressing for example against the surface. The connecting element 26 is constituted by a metal sleeve 29 and a metal tip 30 mounted in the latter, an insulation 31 being provided between these two elements. The conductive wires 11 and 12 of the cable 10 disposed inside the pressure pipe 13 are electrically connected at 32 and 33 to the plug-in electrical elements 29, 30 of the connection element 26. The connection element 26 is of its side held in the internal bore 27 in the manner

  a form. To isolate the connecting element 31 from the coupling element

  14, is introduced into the inner bore 27 an insulating sleeve 34. But the insulating sleeve 34 can also be attached to the connecting element

electric 31.

  The complementary coupling element 20 in the form of a sleeve comprises an electrical connection element 35 also constituted by

  in the form of a plug and which consists of an outer metal shell

  No. 36 and an inner metal casing 37 arranged axially on the inside

  of the first, as well as an insulation 38 disposed between these two sleeves.

  The conducting wires 11 ', 12' of the cable section 10 'are electrically connected.

  to the sleeves constituting the female contacts 36, 37, as shown in FIG.

felt in 32 'or 33'.

  When the duct coupling device 14, 20 is closed, the electrical plug-in tip 30 enters the contact

  female 37, and it is the same for the sleeve 29 which enters the contact.

  female 36, which automatically establishes the electrical connection of the sections

cable 10, 10 '.

  The embodiment of FIG. 3 differs from that of FIG. 2 essentially in that the connection element

  electrical supply is provided here in the form of a plug-in element 40 which is inserted into

  by means of an axial point (not shown) in the internal bore 27 of the insertion head 16 of the coupling armature 14 and which rests at the rear against the frontal surface 28 of the head The two conductive wires 11, 12 of the cable 10 are electrically connected to the connecting element 40. When the coupling device of the sheaths 14 is closed, the two blades 41, 42 of the element electrical connection 40 penetrate into the corresponding openings 43, 44 of the female plug element 45 which is fixed to the complementary coupling element 20, for example by

screwing.

  The embodiment of Figure 4 differs

  of Figure 2 mainly because the two elements of

  electric plugs 26, 35 of the plug-in electrical coupling are inver-

  his. Whereas in FIG. 2, the plug-in element 26 is formed under

  of a male member and is mounted on the plug head 16 of the armature of ac-

  coupling 14 and that the connecting element 35 is constituted as a female element and is connected to the complementary coupling element 20 of the duct coupling device, the connecting element 26 of the example

  embodiment of FIG. 4 is mounted on the complementary coupling element.

  20 and the connecting element 35 is mounted correspondingly

  in the coupling frame 14. This provision has the advantage that the ele-

  connecting elements 26, 35 of the electrical coupling device

  both of which are located inside the coupling elements

  16, 20 of the duct coupling device.

  In the embodiments of FIGS. 2 to 4, the electrical connecting elements 26, 35 or 40, 43 are constituted by separate elements which, when the pressure pipe 13 is used as the cable protective sheath, are introduced into the parts. 14, 20 of the duct coupling device which is otherwise unchanged, or which are connected to

  these coupling elements removably.

  FIG. 5 shows a multi-core cable which contains in a flexible sheath 50 a bundle constituted for example by four pipes 51. The pipes 51 each consist of a hydraulic pressure pipe of conventional type. At least one of these pressure pipes constitutes a protective sheath for an electrical cable which comprises the two conductive wires 11 and 12. The other pressure pipes 51 serve for the transmission of a hydraulic or pneumatic pressure fluid. All the pressure pipes 51 are protected inside a flexible sheath 50 which is

  connected on one side and via a sleeve 52 to a coupling element

  53 of the multi-plug coupling device. The sleeve 52 is connected on one side to the sheath 50 by tight fitting or the like, while the sheath forming envelope is supported internally by a support sleeve 54 in a known manner. All the pipes 51 comprise at their end a plug-in element 55 in the form of a head, by means of which they are maintained in the

  bores for receiving a support plate 55 so as to resist the trac-

  but to be able to rotate, this plate being placed inside the

  coupling member 53 in the form of a housing and fixed by means of a rod 57. These multiple plug coupling devices are known. The essential thing is

  the plug-in head 55 of the pipe 51 in which the electrical cable is arranged.

  provided with an electrical connection element 26 corresponding to

  the connecting element 26 of FIG.

  The complementary coupling element 58 which is fixed

  for example on a housing 21 comprises for each plug-in head 55

  the receiving axial bore 59. Inside the receiving bore 59 which is

  for the plug-in head 55 provided with the electrical connection element

  26 is arranged a corresponding electrical connection element 35 such

  than that of Figure 2, so that when the access device is closed,

  multiple plugging coupling 53, 58, it is determined at the same time that the hydraulic or pneumatic connection an electrical connection of the conductive wires

  cable. In this case too, the coupling device 53, 58 is now

  held firmly assembled-using a U-shaped fork which, by its branches, is introduced into the grooves 60, 61 which come to face each other

  on the face and which are provided in the coupling elements 53, 58.

  In-the examples of realization that have just been

  described, the complementary coupling element 20 or 58 is not necessary-

  It can also be attached to other elements such as at the end of another duct section. In place of the elements

  electrical connections 35, 26, and when it comes to the coupling device

  By multiple insertion of FIGS. 5 and 6, it is also possible to use a plug-in electrical coupling device as shown in FIGS. 3 or 4. When this multi-plug coupling device is used, it is also possible to use the plug-in coupling device. ability to seamlessly pass the

  electrical cable 10 or the conductors 11, 12 in the coupling device

  closed circuit 53, 58, as shown in FIG.

Claims (10)

R E V E N D I C A T I 0 N S   1. - Electrical cable provided with a protective sheath and intended for the electro-hydraulic control of retaining elements in   mining works, characterized in that the electrical cable   The trolley (10) is arranged inside a hydraulic pressure hose (13, 51) constituting the protective sheath and which comprises at its end a coupling plate (16, 55) of a coupling device. cladding coupling (14, 20 or 53, 58) formed in a manner known per se in the form of a device plug-in coupling.   2. - Cable according to claim 1, characterized in that   that a plug-in fork (25) or the like is provided for securing   coupling elements interlocking with one another in the   coupling coupling device formed as a coupling   FILING. 3. - Cable according to claim 1 or 2, characterized in that the nominal diameter of the pressure pipe (13, 51) is greater than   minus one to two mm to that of the cable.   4. - Cable according to any one of claims 1 to   3, characterized in that the insulated electrical cable (10) is introduced into the   coupling device of ducts (14, 20 or 53, 58) in the closed state.   5. Cable according to any one of claims 1 to   3, characterized in that the duct coupling device (14, 20 or 53, 58) is simultaneously formed in the form of an electric coupling, and   preferably a plug-in coupling device.   Cable according to Claim 5, characterized in that the coupling element (16, 55) of the duct coupling device which is mounted at the end of the duct comprises an electrical connection element (26, 35, 40) to which the wires can be electrically connected   electrical conductors (11, 12) of the cable.   7. Cable according to claim 6, characterized in that   that the electrical connection element (26, 35, 40) is connected   to the coupling element (16, 55) of the duct coupling device. 8. Cable according to claim 6 or 7, characterized in   the electrical connecting element (26, 35, 40) is arranged in the   internal lining (27) of the connecting element, preferably so as to   be able to turn freely, or embedded in the internal bore.   9. - Cable according to any one of claims 5 to   8, characterized in that the electrical connection element (26, 35, 40)   is constituted by a plug-in element provided with electrical plugs or con- female tacts or the like.   10. - Cable according to any one of claims 1   9, characterized in that the pressure pipe (13, 51) in which the electric cable is arranged is subjected to an internal pressure by a fluid of   pneumatic or hydraulic pressure.   11. - Cable according to any one of claims 1   10, characterized in that the pressure pipe (51) in which is arranged   the electric cable (10) constitutes the conductive sheath of a light beam   are arranged inside a flexible sheath (50) forming an envelope.   12. - Cable according to claim 11, characterized in that at least one conductive pipe (51) of the bundle of pipes is used for the passage   pressure fluid while at least one other conductive pipe of the   Hole of pipes contains an electric cable.   13. - Cable according to claim 11 or 12, characterized in that the sheath (50) forming envelope and containing the bundle of pipes (51) can be coupledleeau means a plug coupling device multiple (53, 58) knownF in itself.