CN212627100U - Magnesium oxide insulation fireproof cable terminal - Google Patents

Abstract

The utility model discloses a magnesium oxide insulation fireproof cable terminal, including the terminal connector, be provided with perforated ground lug, have internal screw thread first lock nut and arc card strip, the terminal connector is established including the cover first swivel nut on the cable and the fixed first solid ring that sets up on the first swivel nut lateral wall, first swivel nut has external screw thread and internal thread, the ground lug passes through the perforated cover on the first swivel nut, first lock nut with the external screw thread spiro union of first swivel nut, first lock nut with the cooperation of first solid ring will the ground lug presss from both sides tightly, arc card strip joint sets up between the internal thread of first swivel nut and the cable; the magnesium oxide insulated fireproof cable has the advantages of firmer connection between the magnesium oxide insulated fireproof cable and the metal terminal and better reliability.

Description

Magnesium oxide insulation fireproof cable terminal

Technical Field

The utility model belongs to the technical field of the cable termination, especially, relate to an insulating fireproof cable terminal of magnesium oxide.

Background

At present, magnesium oxide insulation fireproof cables filled with magnesium oxide are mostly adopted for the flame-retardant fireproof electric wires and cables, the magnesium oxide insulation fireproof cables have fireproof performance, a metal terminal made of copper is sleeved on the outer layer of the magnesium oxide insulation fireproof cables and used for outer layer grounding, and the melting point of the copper is 1083.4 ℃ to meet fireproof requirements.

The magnesium oxide insulation fireproof cable needs to meet the fire-resistant, waterproof and anti-collision requirements of British fire-resistant cable standard BS6387, and for safe use of the cable, a grounding requirement is provided in laying, a traditional magnesium oxide insulation fireproof cable terminal is shown in figure 1 and comprises a terminal connector 1, a grounding plate 2, a locking ring 3 and a first locking nut 4, the terminal connector 1 is sleeved on the cable 5, the grounding plate 2 is sleeved on the terminal connector 1 and fixed through the first locking nut 4, and the locking ring 3 is arranged between the terminal connector 1 and the cable 5. Because the firmness of connection between the traditional magnesium oxide insulation fireproof cable 5 and the metal terminal is general, the connection between the magnesium oxide insulation fireproof cable and the metal terminal is poor because the connection is loosened due to the conditions of high temperature, vibration and the like during testing.

Disclosure of Invention

The utility model aims to solve the technical problem that a magnesium oxide insulation fireproof cable terminal is provided, is connected more firmly between magnesium oxide insulation fireproof cable and the metal termination, and the reliability is better.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides an insulating fireproof cable terminal of magnesium oxide, includes the terminal connector, is provided with fenestrate grounding lug and has an internal screw thread first lock nut, still includes arc card strip, the terminal connector is established including the cover first swivel nut on the cable is in with fixed the setting first solid fixed ring on the first swivel nut lateral wall, first swivel nut has external screw thread and internal thread, the grounding lug passes through the perforated cover is in on the first swivel nut, first lock nut with the external screw thread spiro union of first swivel nut, first lock nut with first solid fixed ring cooperation will the grounding lug presss from both sides tightly, arc card strip joint sets up the internal thread of first swivel nut with between the cable.

Preferably, the arc-shaped clamping strip is in a double-head conical shape with a thick middle part and thin axial ends, and the conical inclination is 1: 100.

Preferably, the central angle of the arc-shaped clamping strip ranges from 315 degrees to 355 degrees.

Preferably, the clamping device further comprises a second lock nut, the second lock nut comprises a second threaded sleeve with external threads and a second fixing ring fixedly arranged on the outer side wall of the second threaded sleeve, the second threaded sleeve is in threaded connection with the internal threads of the first threaded sleeve, and one end of the second threaded sleeve abuts against one side of the arc-shaped clamping strip.

Preferably, the grounding strip is in a water drop shape with a large end and a small end, the large end of the grounding strip is provided with the through hole, and the small end of the grounding strip is provided with the small hole.

Preferably, the first connecting end of the arc-shaped clamping strip is provided with a clamping block, the second connecting end of the arc-shaped clamping strip is provided with a clamping groove, and when the first movable end of the arc-shaped clamping strip contacts with the second movable end of the arc-shaped clamping strip, the clamping block is clamped and matched with the clamping groove.

Compared with the prior art, the utility model has the advantages of adopt arc card strip to replace traditional check ring, arc card strip is the opening setting, and for the check ring of closed type, first swivel nut and cable are at the in-process of locking, and the opening of arc card strip is closed trend gradually, makes the internal diameter of arc card strip diminish gradually and the stirrup cable, changes to form firm connection, and the reliability is better.

Drawings

FIG. 1 is a schematic structural diagram of a conventional metal terminal;

fig. 2 is a schematic diagram of the explosion structure of the present invention;

FIG. 3 is a schematic structural view of the present invention;

fig. 4 is a schematic side view of the present invention;

FIG. 5 is a first schematic structural view of the arc-shaped clip strip of the present invention;

fig. 6 is a schematic structural diagram of the middle arc-shaped clamping strip of the present invention.

In the figure: 1. a terminal connector; 11. a first threaded sleeve; 12. a first retaining ring; 2. a ground plate; 21. perforating; 22. a small hole; 3. a locking ring; 4. a first lock nut; 5. a cable; 6. an arc-shaped clamping strip; 61. a clamping block; 62. a card slot; 7. a second lock nut; 71. a second thread insert; 72. a second retaining ring.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The first embodiment is as follows: as shown in the figure, an insulating fireproof cable terminal of magnesium oxide, including terminal connector 1, be provided with perforation 21's ground lug 2, internal screw thread first lock nut 4 and arc card strip 6 have, terminal connector 1 establishes first swivel nut 11 on cable 5 and fixed first solid fixed ring 12 that sets up on first swivel nut 11 lateral wall including the cover, first swivel nut 11 has external screw thread and internal thread, ground lug 2 overlaps on first swivel nut 11 through perforation 21, first lock nut 4 and the external screw thread spiro union of first swivel nut 11, first lock nut 4 presss from both sides ground lug 2 with the cooperation of first solid fixed ring 12, arc card strip 6 joint sets up between the internal thread of first swivel nut 11 and cable 5.

In this embodiment, the arc-shaped clamping strip 6 is a double-head taper with a thick middle and thin axial ends, and the taper slope is 1: 100.

In this embodiment, the central angle of the arc-shaped clamping strip 6 is 315 ° or 355 °.

Example two: the rest of the embodiment is the same as the first embodiment, and the difference is that the first lock nut 7 further comprises a second lock nut 7, the second lock nut 7 comprises a second threaded sleeve 71 with external threads and a second fixing ring 72 fixedly arranged on the outer side wall of the second threaded sleeve 71, the second threaded sleeve 71 is in threaded connection with the internal threads of the first threaded sleeve 11, and one end of the second threaded sleeve 71 abuts against one side of the arc-shaped clamping strip 6. This second lock nut 7 compares with first lock nut 4 among the prior art, and first lock nut 4 among the prior art adopts internal thread and terminal connector 1 spiro union, and this second lock nut 7 adopts external thread and terminal connector 1 spiro union, so when terminal connector 1's size is unanimous, the diameter of second swivel nut 71 among this second lock nut 7 is less relatively, and corresponding used copper product is less relatively, can save certain material cost.

In this embodiment, the central angle of the arc-shaped clamping strip 6 is 330 °.

In this embodiment, the grounding plate 2 is in a water drop shape having a large end and a small end, the large end of the grounding plate 2 is provided with a through hole 21, and the small end of the grounding plate 2 is provided with a small hole 22, and can be grounded through the small hole 22.

Example three: the rest of the structure is the same as the first embodiment, and the difference lies in that the first connecting end of the arc-shaped clamping strip 6 is provided with the clamping block 61, the second connecting end of the arc-shaped clamping strip 6 is provided with the clamping groove 62, when the first movable end of the arc-shaped clamping strip 6 contacts with the second movable end of the arc-shaped clamping strip 6, the clamping block 61 is in clamping fit with the clamping groove 62, and the improvement of the alignment accuracy of the first movable end of the arc-shaped clamping strip 6 and the second movable end of the arc-shaped clamping strip 6 is facilitated.

The present invention has been described in detail with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and various improvements of the method concept and the technical solution of the present invention can be made without modification, or the present invention can be directly applied to other occasions without modification, and is within the protection scope of the present invention.

Claims (6)

1. A magnesium oxide insulation fireproof cable terminal comprises a terminal connector (1), a grounding plate (2) provided with a through hole (21) and a first locking nut (4) with internal threads, it is characterized by also comprising an arc-shaped clamping strip (6), wherein the terminal connector (1) comprises a first threaded sleeve (11) sleeved on the cable (5) and a first fixing ring (12) fixedly arranged on the outer side wall of the first threaded sleeve (11), the first threaded sleeve (11) is provided with an external thread and an internal thread, the grounding plate (2) is sleeved on the first threaded sleeve (11) through the through hole (21), the first lock nut (4) is in threaded connection with the external thread of the first thread insert (11), the first locking nut (4) is matched with the first fixing ring (12) to clamp the grounding plate (2), arc card strip (6) joint setting is in the internal thread of first swivel nut (11) with between cable (5).

2. The magnesium oxide insulation fireproof cable terminal according to claim 1, wherein the arc-shaped clamping strip (6) is in a double-head taper shape with a thick middle part and thin axial ends, and the taper gradient is 1: 100.

3. The magnesium oxide insulated fireproof cable termination of claim 1, wherein the central angle of the arc-shaped locking strip (6) ranges from 315 ° to 355 °.

4. The magnesium oxide insulated fireproof cable terminal according to any one of claims 1 to 3, wherein the magnesium oxide insulated fireproof cable terminal further comprises a second lock nut (7), the second lock nut (7) comprises a second barrel (71) with external threads and a second fixing ring (72) fixedly arranged on the outer side wall of the second barrel (71), the second barrel (71) is in threaded connection with the internal threads of the first barrel (11), and one end of the second barrel (71) abuts against one side of the arc-shaped clamping strip (6).

5. A magnesia insulated fireproof cable termination according to claim 1, wherein the grounding plate (2) is in the shape of a drop of water having a large end and a small end, the large end of the grounding plate (2) being provided with said perforations (21) and the small end of the grounding plate (2) being provided with small holes (22).

6. The magnesium oxide insulation fireproof cable terminal according to claim 1, wherein the first connecting end of the arc-shaped clamping strip (6) is provided with a clamping block (61), the second connecting end of the arc-shaped clamping strip (6) is provided with a clamping groove (62), and when the first movable end of the arc-shaped clamping strip (6) contacts with the second movable end of the arc-shaped clamping strip (6), the clamping block (61) is in clamping fit with the clamping groove (62).

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