Cable plug for electric cable connections

FIELD: plug connectors for cables of subsurface workings of mines.

SUBSTANCE: proposed cable-terminating plug forms hollow plug socket of brass whose hollow section on cable end forms cable entry hole and has supporting collar that functions to support male connecting member projection in axial direction. Cable entry hole is provided with inner thread for turning in metal tetrahedron that has through hole for cable entry. Cable screen or armor can be placed between through hole and cable sheath to ensure adequate grounding of cable and cable plug. Inner space of plug socket is sealed by means of shaped part molded on cable sheath, on plug socket, and on polyhedron. Shaped part is also used for securing cable in axial direction on plug socket.

EFFECT: ability of long-time service in damp media due to reliable sealing attained by simple means.

13 cl, 3 dwg

 

The invention relates to a cable connector for electrical cable connections, in particular to connectors for electrical connections of cables in underground mining, in accordance with the type described in the restrictive part of claim 1 of the claims. The preferred field of application in underground mining is the electrical connection cable connector, for example, to an electrohydraulic control device supports. The invention, however, is not limited to applications in underground mines.

The applicant created cable connectors described above with plug-in socket of metal that has a hole for cable entry with internal thread, and the support flange of the plastic plug / socket connectors, which are equipped with plug-in pins and/or screwless sockets connected to wire conductors single - core or multicore electric cable. The fixing of the cable in the axial direction of the plug in the socket is performed by means of a screw connection element made of plastic, which is threaded plug on one end screwed into the hole for the cable, and at its other end is located in a ring around the cable sheath plate crown, with the hinged cover is pressed to Plotnichenko the cuff, surrounding the cable sheath. The sealing plug part from the side of the cable from moisture depends on the efforts of the clamping applied to the sealing cuff and the plate crown or the gap between the individual plates is a weak point in terms of tightness. For use in connectors cable plugs are inserted into the socket part and using the Union nut fix it, and between the socket part and the cable plug is sealing element, such as a ring, as a protection against penetration of moisture and/or contamination.

With long-term use in humid environments and in areas prone to spraying water, which, in particular, are in an underground mine workings, cable connectors suitable cable connections not always, however, provide sufficient tightness against water. Helical connecting elements with plate crown require high technological costs. So that the cable plugs are supplied with screw connection elements, are unlikely to be competitive because of their high prices. In addition, in known cable plugs missing the ground.

Object of the invention is to eliminate the above disadvantages in the cable plugs for electricity is such a plug and using simple measures to create a cable plug, suitable for continuous operation in humid environments, such as in underground mining.

This task, according to the invention, is solved by the fact that the hole for the cable entry screwed multifaceted metallic element, provided with a through hole for the cable, and the cable is fixed with a seal in the axial direction with fittings, reformovanii to the cable sheath, connector socket and the polyhedron. Thanks to reformowania appropriate fittings creates an extremely effective protection against penetration of moisture into the plug socket. Advantages fittings consist of, among others, that it is in the form of a sealing mass to a certain extent ensures the sealing of the cable into the plug socket or hole for cable entry. Because design prevents leaks as a result of the mounting of blemishes, it is possible, furthermore, to control the quality of the plugs according to the invention in the manufacture of cable connectors, i.e. directly after reformowania fittings from a material that retains elasticity in a long time. The polyhedron of the metal that touches the metal plug socket with threaded surfaces, simultaneously causes proper grounding to the blanching.

Preferably, the polyhedron was provided with threaded sections only at its corner edges, so that the flat side between the corner edges were made flat. When screwed into the polyhedron due to this, there are many hollow space between the outer surface of the polyhedron and the inner surface of the openings for cable entry, which can penetrate injection weight fittings. Further, it is preferable that the through hole of the polyhedron had a ledge, and it is preferable that the area of the openings from the side of the cable had a bore diameter that is larger than the diameter of the cable sheath. Formed in between the cable sheath and the intermediate polyhedron space, you can lay the rebar or screening, which is free when laying conductive lived compacted by the end of the cable, so also here, the grounding cable on the cable plug.

In the area of the openings from the side of the cable can slide the adapter sleeve. Especially beneficial if freely laid valves or the shielding of the cable is placed between the plot holes either side of the cable and an adapter sleeve. For installation it is recommended that an adapter sleeve to secure the cable sheath with locking belt before preformationism FAS is authorized details.

Further, it is preferable that the length of the polyhedron was about 3-7 mm larger than the thread in the hole for cable entry and/or thread passes only through a partial area of the openings for cable entry from the side of the cable so that the polyhedron could be screwed into the hole for cable entry with braking. Since the polyhedron is longer than the thread, the clamping sleeve is a narrow stretch of the polyhedron, which can install the tool for final Assembly, such as a wrench. Particularly preferably, if the polyhedron is a tetrahedron.

Reformowana integrally molded part preferably can be carried out inside an adapter sleeve between the internal thread holes for cable entry and the outer surface of the polyhedron, and its end is outside of the clamping sleeve. Using the appropriate location or reformowania fittings all joints between the inner space of the clamping sleeve and the outer side on the side of the cable are sealed and filled the cavity between the adapter sleeve and the polyhedron, so that ensures absolute tightness.

In a particularly preferred embodiment, the sealing ring surrounding the cable sheath, included in the fitting. This plot is sustained fashion ring which is particularly economical embodiment has the form of, for example, rings of circular cross section, forms an additional barrier against entry of moisture inside an adapter sleeve. Formed sealing ring located inside fittings of the barrier may, in particular, be necessary if the fitting because of the strong vibrations of the connected devices or because of too small bending radii of the cable is partially separated from the cable sheath.

Fitting may consist preferably of cast or obtained by molding the mass of an appropriate plastic, preserving elasticity for a long time.

The invention is illustrated hereinafter in more detail with reference to the drawing, which presents a preferred example of execution. In the drawing show:

1 not mounted electrical plug connector, for example, apparatus for underground mining, which is formed shown in the cross section of the cable plug and the socket part;

2 is a tetrahedron for the cable connector end view,

3 an adapter bushing for cable plug according to the invention in the context.

Presented at the drawing of the cable connector 10 is used to connect cable 1, for example, are not represented in more detail electrohydraulic control the managing device to the support, which is used in different ways in underground mining.

Plug connector 10 consists mainly of the socket part 2 and the cable plug 3. Cable plug 3, which forms the end of the cable 1 has a hollow plug socket 4 of the brass. Hole plug socket 4 its located on the side of the cable section forms a hole for cable entry and has a supporting flange 5, which is based in the axis direction of the plug connecting element 6 made of plastic with regional ledge 6'. In the example, run the plug-in connecting element 6 rests on the side of the slot on the supporting flange 5. Alternative plug-in connecting element, however, on the part of the cable can rely on the support flange, which is also plug-in connecting element is pushed then through the hole for the cable entry into the plug socket. Plug-in connecting element 6, as is in itself known, has connector pins and/or the plug socket, and a separate conductive wires 23 of the cable 1 are connected with plug-in sockets 7 in the plug of the connecting element 6. In assembled condition (not shown) plug pins of the plug of the connecting element 6 is inserted into the corresponding plug socket in the return part 8 of the socket part 2 and the plug socket 7 su is alauda accordingly, the plug pins response details 8.

Plug / socket 4 has a front cylindrical guide pin 9, which is on its peripheral surface provided with two spaced-axis one behind the other retaining grooves 11, 12, who both take on elastic ring 13, 14 with a circular cross section. Location such that the rings 13, 14 with a circular cross section slightly protrude from the retaining grooves 11, 12 in the radial direction over the peripheral surface of the guide pin 9. An alternative could be envisaged only one ring with a round cross-section and one of the retaining groove and the guide pin with one retaining groove would then, in General, to form the front section of the plug socket.

Socket part 12 at its inner perimeter 16 is supplied passing through the peripheral surface of the locking groove 15, which in the assembled condition, is located at the same position along the axis as the front in the direction of lowering the retaining groove 11, so that the front ring 13 having circular cross-sections in assembled position simultaneously included in the front holding groove 11 and the locking groove 15 and fixes relative to each other socket part 2 and the cable plug 3. Both under radial tension rings 13, 14 with a circular cross section sealing plug connector 10 in assembled condition from moisture and pollution is s.

For reliable fixing of the plug / socket 4 or cable plug 3 into the female part 2 is preferably installed at the plug socket 4 with the possibility of rotation of the Union nut 17, which is equipped with a rear retaining flange 18 within passing around the circumference of the support groove 19. Alternative reference groove Union nut and the retaining groove for rings with circular cross-sections could be placed also closer to the bottom here insert the end of the 20th.

Figure 1 shows that the plug socket 4 in the hole for cable entry at the input end 21 of the cable has an internal thread 22, which is screwed presented in figure 2 in an enlarged view made in the form of hemp tetrahedron 30. Made preferably of brass square rod tetrahedron 30 comprises four corner edges 31 and four flat sides 32, and the corner edges 31 provided with threaded sections 33. The threads 33 all four corner edges 31 create together corresponds to the internal thread 22 of the screw track. The shank 30 has a through hole 35, which thanks to the ledge 36 is tapered towards its lower end to the through holes 37, the value of disclosure in which the light is narrower than the diameter D of the cable (figure 1). Located on the side of the cable section 38 of the hole of the shank 30 who meet the diameter, which is a few mm larger than the diameter of the cable. Situated opposite end 39 of the through hole 37 of the end 39 holes drilled in front of the plot holes 38, as shown in figure 3 an adapter sleeve 45 may vdvinut'sâ in the tetrahedron between the shell 1' of cable and the areas of the openings 38, 39. An adapter sleeve 45 made of brass and has an annular flange 46 and the annular rib 47.

Figure 1 shows an assembled state of the plug-in socket 4, tetrahedron 30, an adapter sleeve 45, the cable 11 and the plug of the connecting element 6. For mounting loosely stacked conductive wires 23 and the valve 24 of the cable 1 and the conductive wires 23 is carried out through the through hole 37 in the shank 30. The valve 24 when it is clamped between the shell 1’ of cable and plot holes 38 so that the cable 1 is grounded at the brass shank 30. After conducting wires 23 are connected with plug-in sockets 7 in the plug of the connecting element 6, polyhedron 30 is screwed into the internal thread 22; this simultaneously provides full ground-based metal connection between the armature 24, the shank 30 and the plug socket 4. The length of the internal thread 22 passes only through a partial area of the openings for cable entry, so that the shank 30 can be screwed into it with samot what omogenia. The length of the shank 30 is greater than the length of the internal thread 22.

In the pre-assembled so constructive node from the rear, i.e. from the input end 21 of the cable, an adapter sleeve 45 vidvigayt in section 38 of the hole, sending forward annular flange 46, and is fixed using a fixing belt 48. An adapter sleeve 45 with his deeply pushed annular rib 47 reinforces the axial fixing of the cable 1 into the plug sleeve 4. After then, the ring 26 with a circular cross section is installed at a specified distance from the input end 21 of the cable fitting 27 of the respective plastics can preformulated, for example, using two overlapping end plug socket 4 pelucas by casting or injection molding. The plastic part is also in the intermediate space between the flat sides 32 of the shank 30 and the thread of the thread 22, and further between the plug of the connecting element 6 and the protrusion 36 of the shank 30 and through the through hole 37 in the end of the hole 39. This is done here using only the process of molding and leads, among other things, for bonding castable material with plug-in connecting element 6, which thereby simultaneously recorded. Fitting 27 forms the end of the cable shteke is 3, moreover, the sealing ring 26 is enclosed in passing out of the plug socket, the larger end section 28 of the fitting 27.

1. Cable connector for electrical cable connections, in particular, for plug connectors electrical cable connections in underground mining that contains the plug / Jack of metal that has a hole for cable entry with internal thread, and the support flange of the plastic plug for the connecting element, which is equipped with plug-in pins and/or screwless sockets, which are connected to cable conductors single - core or multicore electric cable, preferably provided with a shielding or reinforcement, characterized in that hole for cable entry screwed polyhedron (30) made of metal, provided with a through hole (35) for cable, and the cable (1) is fixed with the seal using reformovanii to the shell (1′) cable, polyhedron (30) and plug / Jack (4) fittings (27).

2. Cable plug according to claim 1, characterized in that the polyhedron on their angular edges (31) is provided with a threaded sections (33).

3. Cable plug according to claim 1 or 2, characterized in that a through hole (35) of the polyhedron (30) has a ledge (36), preferably the area (38) of the openings from the side of the cable has a diameter (In) holes, to the verge more than the diameter (D) of the cable sheath.

4. Cable plug according to one of claims 1 to 3, characterized in that the section (38, 39) of the openings from the side of the cable is pushed an adapter sleeve (45).

5. Cable connector according to claim 4, characterized in that the freely laid valves or shielding (24) cable (1) is located between the area (38) of the hole with the cable side of the polyhedron (30) and an adapter sleeve (45).

6. Cable connector according to claim 4 or 5, characterized in that the clamping sleeve (45) before preformationism fittings (27) is fixed on the shell (1′) cable with locking band (48).

7. Cable plug according to any one of claims 1 to 6, characterized in that the length of the polyhedron (30) about 3-7 mm larger than the internal thread (22) hole for cable entry and/or thread (22) passes only through a partial area of the openings for cable entry with cable side.

8. Cable plug according to any one of claims 1 to 7, characterized in that the polyhedron (30) is a tetrahedron.

9. Cable plug according to one of claims 1 to 8, characterized in that the integral reformowana fitting (27) extends into the plug socket (4) between its internal thread (22), flat sides (32) of the polyhedron (30), and up to the end of hole (39), and its large end plot (28) out of the plug socket (4).

10. Cable plug for any who one of claims 1 to 9, characterized in that at the area of the fitting (27), passing outside plug socket (4), concluded that the o-ring (26)surrounding the shell (1′) cable.

11. The cable plug of claim 10, characterized in that the sealing ring (26) is a ring.

12. Cable plug according to any one of claims 1 to 11, characterized in that the fitting (27) consists of a cast or molded mass of plastic material, having the ability to maintain elasticity for a long time.

13. Cable plug according to one of claims 1 to 12, characterized in that the plug socket (4), polyhedron (30) and/or an adapter sleeve (45) consist of brass.



 

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FIELD: plug connectors for cables of subsurface workings of mines.

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