A flame retardant cable

Abstract

The present invention provides a flame-retardant cable, belonging to the field of cable technology, including a limiting fixing body, the limiting fixing body including: a support ring provided with a limiting clamp, the limiting clamp corresponds to the wire core and is clamped on the exposed wire core, and during the initial limiting, the wire core and the limiting clamp are in a relaxed state; a tightening head, the tightening head automatically tightens the limiting clamp during the connection process of connector one or connector two so that it is in a tightly limited fixed state with the corresponding wire core and limits the supporting ring in the opposite direction. In the flame-retardant cable, the limiting fixing body limits and fixes the exposed part of the wire core and fully keeps the exposed part of the wire core in a straight line with the unexposed part, and at the same time, the compression and fixation of the connection by the compression head effectively improves the strength of the cable connection and the stability and reliability of the connection, thereby improving the service life of the cable and the stability and reliability of use.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a flame-retardant cable. Background Art

[0002] Flame-retardant cables are special cables that can slow down the spread of flames when encountering a fire source. They are often used in situations where a high degree of fire safety is required, such as buildings, ships, rail transit systems, etc. They are designed to meet specific safety standards and testing requirements to ensure additional safety in the event of a fire.

[0003] At present, in order to achieve flame retardant performance, flame retardant cables usually adopt one or several methods such as increasing the thickness of the insulation layer, adding sheath, filling flame retardant, etc. to increase the flame retardancy, which is correspondingly beneficial to improve the mechanical strength of the cable and extend the service life of the cable. However, the joints are usually connected by tape wrapping, and the overall mechanical strength is difficult to fully match the mechanical strength of the cable body, which can easily reduce the service life of the cable line and affect the stability and reliability of the cable. Summary of the invention

[0004] The present invention provides a flame-retardant cable to solve the problem in the related art that the low strength of the cable connection affects the service life, stability and reliability of the cable.

[0005] The present invention provides a flame-retardant cable, which comprises a wire body 1 and a wire body 2, wherein the wire cores in the wire body 1 correspond to the wire cores in the wire body 2 one by one and the corresponding wire cores are connected together; a connector 1 sleeved on the wire body 1 and a connector 2 sleeved on the wire body 2, wherein the connector 1 and the connector 2 are connected in a relative feeding manner, the connector 1 covers the wire core connection and the connector 1 is in a static state during the connection process; a limiting fixed body, wherein the limiting fixed body limits the exposed part of the wire core in the wire body 1 and the exposed part of the wire core in the wire body 2 respectively. The limit fixing body includes: a support ring provided with a limit clamp, the support ring and the corresponding joint one and joint two are both slidably connected, the limit clamp corresponds to the wire core and is clamped on the wire core, and during the initial limit, the wire core and the limit clamp are in a relaxed state; a tightening head, the tightening head automatically tightens the limit clamp during the connection of joint one or joint two so that it is in a tightly limited fixed state with the corresponding wire core and limits the support ring in the reverse direction; a pressing body, the pressing body presses and fixes the connection of the wire core during the connection of joint two and joint one.

[0006] In one possible implementation, the tightening head includes a pushing member and a clamping member radially slidably connected to a support ring, the tightening head in the upper limit fixing body of joint two also includes a supporting member, the supporting member is limited by a pair of corresponding support rings of the joint, the corresponding pushing member is fixedly connected to joint two, the pushing member in the upper limit fixing body of joint one is axially slidably connected to joint one, the contact surfaces of the pushing member and the clamping member are both inclined surfaces that fit each other, and the inclined surface of the pushing member on joint one is in opposite directions to the inclined surface of the pushing member on joint two, the pushing member on joint one can move in the circumferential upper limit direction and control the alignment or stagger of the pushing member and the corresponding clamping member by moving the pushing member.

[0007] In one possible implementation, the clamping body includes a plurality of clamping heads provided with inclined pushing surfaces and a limiting member provided with a supporting head. The limiting members correspond to the clamping heads one by one and are axially slidably connected to joint one. The clamping heads are distributed along the circumference of joint one and are radially slidably connected to joint one. The supporting head is in direct contact with joint two and axially slides synchronously with the limiting member during the process of connecting joint two with joint one. The limiting member radially pushes the clamping head through the inclined pushing surface.

[0008] In one possible implementation, the joint 1 and the joint 2 are threadedly connected, the joint 1 includes an inner base 1 and an outer shell 1, the inner base 1 is located inside the outer shell 1 and an extrusion seal 1 is arranged between the two, the joint 2 includes an inner base 2, an outer shell 2 and a rotating shell, the rotating shell is threadedly connected to the outer shell 1 and rotatably connected to the outer shell 2, the outer shell 2 is slidably connected to the inner base 2 and an extrusion seal 2 is arranged between the two.

[0009] In one possible implementation, there are a number of limit chucks on the support ring, and the limit chucks are distributed along the circumference of the corresponding support ring. The limit chucks are arc-shaped structures, and the limit chucks distributed along the circumference of the support ring are connected together in sequence to form a closed limit fixing frame. The limit fixing frame has deformation ability, and the tightening heads are respectively located at the connection points of adjacent limit chucks and abut against the connection points.

[0010] In one possible implementation, a sliding connection is provided between joint 1 and the support ring and between joint 2 and the support ring, and the sliding connection includes a limiting slide groove and a slide rod, wherein the sliding connection between joint 1 and the support ring also includes a rotating ring, which is rotatably connected to the corresponding support ring and fixedly connected to the corresponding limiting slide groove.

[0011] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0012] 1. According to a flame-retardant cable provided by an embodiment of the present invention, a limiting fixing body limits and fixes the exposed part of the wire core and fully keeps the exposed part and the unexposed part of the wire core in a straight line state. At the same time, the connection is clamped and fixed by a clamping head, which effectively improves the strength of the cable connection and the stability and reliability of the connection, thereby improving the service life of the cable and the stability and reliability of use. The entire connection process is fast, simple and convenient, which is convenient for quickly connecting the cable.

[0013] 2. According to a flame-retardant cable provided by an embodiment of the present invention, the limiting clamps on the support ring are connected together in sequence to form an integrated and closed limiting fixing frame, and the limiting fixing frame is pressed against the limiting fixing frame by moving radially along the support ring through a clamping piece, so that the limiting fixing frame shrinks inward and fits tightly to fix the wire core, so that it is in a stable state. On the basis of ensuring the stability of the wire core, the overall structure is simplified to improve the overall stability and reliability of the cable.

[0014] 3. According to a flame-retardant cable provided by an embodiment of the present invention, the tightening head automatically tightens the limit clamp during the connection process between connector one and connector two, so that the limit clamp firmly limits and fixes the wire core, and at the same time limits the support ring, so that the entire structure is in a stable state, thereby improving the overall stability and reliability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the connection process of wire body 1 and wire body 2 of a flame-retardant cable provided in an embodiment of the present invention.

[0016] Figure 2 It is a structural schematic diagram of an inner base body 2, an outer sleeve body 2 and a rotating sleeve body of a flame-retardant cable provided in an embodiment of the present invention.

[0017] Figure 3 It is a structural schematic diagram of an inner base body and an outer jacket body of a flame-retardant cable provided in an embodiment of the present invention.

[0018] Figure 4 It is a schematic structural diagram of a compression body of a flame-retardant cable provided in an embodiment of the present invention.

[0019] Figure 5 It is a schematic diagram of a process in which an inner base of a flame-retardant cable provided by an embodiment of the present invention moves axially so that a pushing member passes through a corresponding pressing member and rotates circumferentially so that the pushing member faces the corresponding pressing member.

[0020] Figure 6 It is a schematic diagram of the tightening process of a limit fixing frame of a flame-retardant cable provided in an embodiment of the present invention.

[0021] In the figure: 1. wire body one; 2. wire body two; 3. wire core; 4. connector one; 41. inner base body one; 42. outer body one; 43. sealing body one; 5. connector two; 51. inner base body two; 52. outer body two; 53. rotating sleeve body; 54. sealing body two; 6. limiting fixing body; 61. limiting clamp; 62. supporting ring; 63. tightening head; 631. pushing member; 632. pressing member; 633. supporting member; 7. pressing body; 71. inclined pushing surface; 72. pressing head; 73. supporting head; 74. limiting member; 8. conductor; 9. filling area; 10. sliding connection; 101. limiting slide groove; 102. slide rod; 103. rotating ring. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] See also Figure 1 A flame-retardant cable comprises a wire body 1 and a wire body 2. The three wire cores 3 in the wire body 1 correspond to the three wire cores 3 in the wire body 2 one by one and the conductors 8 in the corresponding wire cores 3 are connected together. The wire body 1 is provided with a connector 4, and the wire body 2 is provided with a connector 2 5. Before the conductors 8 in the corresponding wire cores 3 are connected, the connector 1 4 is provided on the wire body 1 and the connector 2 5 is provided on the wire body 2 2. After the conductors 8 are connected, the connector 1 4 is fixedly connected to the connector 2 5, so as to increase the connection strength between the wire body 1 and the wire body 2 2 and improve the service life of the cable as well as the stability and reliability of use.

[0024] See also Figure 1 , Figure 4 and Figure 5 , the connector 1 4 and the connector 2 5 are connected in a relative feeding manner, and the connector 1 4 and the connector 2 5 are both provided with a limit fixing body 6, which respectively limits and fixes the exposed part of the wire core 3 in the wire body 1 and the exposed part of the wire core 3 in the wire body 2, thereby improving the stability of the exposed area of ​​the wire core 3 so that the state of the exposed part of the wire core 3 is consistent with that of the unexposed part, such as Figure 1As shown, the unexposed portion of the core 3 is wrapped by the filling area 9 and is in a firmly fixed state, and the exposed portion is stabilized by the limiting fixing body 6, thereby improving the overall strength of the cable, and a clamping body 7 is provided on the connector 1 4. After the connector 1 4 is fixedly connected with the connector 2 5, the connector 1 4 covers the connection of the core 3, and the connection of the conductor 8 is clamped and fixed by the clamping body 7, thereby improving the connection strength between the wire body 1 and the wire body 2 2, and further improving the overall strength of the cable.

[0025] participate Figure 1 and Figure 5 The joint 4 includes an inner base 41 and an outer sleeve 42, the outer sleeve 42 is sleeved on the inner base 41 and the two are limitedly slidably connected, an extrusion seal 43 is arranged between the end of the inner base 41 away from the joint 5 and the outer sleeve 42, and the extrusion seal 43 is fixedly connected to the inner base 41, the joint 5 includes an inner base 51, an outer sleeve 52 and a rotating sleeve 53, the rotating sleeve 53 is threadedly connected to the outer sleeve 42 and rotatably connected to the outer sleeve 52, and the inner base 51 and the outer sleeve 52 are limitedly connected. The inner base body 2 51 is slidably connected, and an extrusion sealing body 2 54 is arranged between the end of the inner base body 2 51 away from the joint 1 4 and the outer sleeve body 2 52. The extrusion sealing body 2 54 is fixedly connected to the inner base body 2 51. Before the joint 1 4 and the joint 2 5 are not fixedly connected, the outer sleeve body 1 42 and the inner base body 1 41, as well as the outer sleeve body 2 52 and the inner base body 2 51 are all in a relaxed state. At this time, the joint 1 4 and the line body 1 1, the joint 2 5 and the line body 2 2 are not in a tightly connected state, which is convenient for the joint 1 4 to be smoothly installed on the line body 1 and move, and the joint The second 5 is smoothly sleeved on the line body 22 and moves, and in the process of the fixed connection between the joint 14 and the joint 25, the rotating sleeve body 53 and the outer sleeve body 142 are threadedly connected to gradually reduce the distance between the inner base body 141 and the inner base body 251 until the two are abutted together, and then as the rotating sleeve body 53 is threadedly connected with the outer sleeve body 142, the outer sleeve body 142 and the outer sleeve body 252 continue to feed relatively, and the extrusion seal body 143 between the inner base body 141 and the outer sleeve body 142 and the extrusion seal body 143 between the inner base body 251 and the outer sleeve body 252 are squeezed. The body 2 54 causes the extruded sealing body 1 43 and the extruded sealing body 2 54 to deform and fit tightly on the outer peripheral surface of the corresponding wire body 1 and wire body 2 2, so that the joint 1 4 and the wire body 1, the joint 2 5 and the wire body 2 2 are tightly connected together, thereby improving the sealing of the connection and the overall connection strength between the wire body 1 and the wire body 2 2. In addition, as needed, a penetrating injection hole can be opened on the inner base body 1 41 and the outer sleeve body 1 42 or on the inner base body 2 51 and the outer sleeve body 1 42, and a flame retardant can be injected to further improve the strength and flame retardant properties of the cable.

[0026] See also Figure 1 , Figure 2 and Figure 3The limiting fixing body 6 includes a tightening head 63 and a support ring 62 provided with a limiting clamp 61, the limiting clamp 61 corresponds to the wire core 3 one by one and is clamped on the corresponding wire core 3, the inner matrix 1 41 and the inner matrix 2 51 are both annular structures, and the support ring 62 and the inner matrix 1 41 in the corresponding joint 1 4 and the inner matrix 2 51 in the joint 2 5 are coaxially arranged, such as Figure 2 As shown, taking the inner base body 2 51 and the corresponding limiting fixing body 6 as an example, the inner base body 2 51 is sleeved on the wire body 2 2, the support ring 62 is sleeved on the three wire cores 3, and the limiting clamp 61 is correspondingly clamped on the wire core 3, which is beneficial for the limiting clamp 61 to limit and fix the wire core 3 on the wire body 2 2 based on the wire body 2 2, so that the exposed part of the wire core 3 and the unexposed part of the wire core 3 maintain a straight line state, which is beneficial to further improve the stability and reliability of the cable to a certain extent. The inner base body 1 41 and the corresponding limiting fixing body 6 are the same. In addition, during the initial limiting, the wire core 3 and the limiting clamp 61 are in a relaxed state, which is convenient for the limiting clamp 61 to smoothly move along the axial direction and clamp on the corresponding wire core 3. Afterwards, in the process of fixed connection between the connector 1 4 and the connector 2 5, the tightening head 63 automatically tightens the limiting clamp 61 so that the limiting clamp 61 and the corresponding wire core 3 are in a tightly limited fixed state, thereby improving the stability of the wire core 3.

[0027] participate Figure 1 , Figure 2 , Figure 3 and Figure 6 The tightening head 63 includes a pushing member 631 and a pressing member 632 radially slidably connected to the support ring 62. The number of the limiting clamps 61 on the support ring 62 is three and the limiting clamps 61 are distributed along the circumference of the corresponding support ring 62. The limiting clamps 61 are arc-shaped structures and the limiting clamps 61 distributed along the circumference of the support ring 62 are sequentially connected together to form an integrated and closed limiting fixing frame. The limiting fixing frame has deformation ability. The pressing members 632 are respectively located at the connection of adjacent limiting clamps 61 and abut against the connection. Figure 6 As shown in the upper middle view, in the initial state, the limiting fixing frame is in an expanded state. At this time, the limiting fixing frame can be smoothly put on the three wire cores 3 distributed in a herringbone shape, and the arc structure of the limiting clamp 61 is used to preliminarily limit the wire core 3. In the process of fixed connection between connector 1 4 and connector 2 5, the clamping piece 632 moves inward along the radial direction of the support ring 62 to shrink the limiting fixing frame, so that the limiting clamp 61 is tightly fitted and fixed to the corresponding wire core 3, so that the wire core 3 is in a stable fixed state.

[0028] See also Figure 1 , Figure 3 and Figure 5The tightening head 63 in the upper limit fixing body 6 of the joint 2 5 also includes a supporting member 633, which is fixedly connected to the corresponding support ring 62 and limits the corresponding support ring 62 through the inner base 1 41. The corresponding pushing member 631 is fixedly connected to the inner base 2 51. The pushing member 631 in the upper limit fixing body 6 of the joint 4 is axially slidably connected to the inner base 1 41. The contact surfaces of the pushing member 631 and the pressing member 632 are both inclined surfaces that fit each other, and the inclined surface of the pushing member 631 on the inner base 1 41 is opposite to the inclined surface of the pushing member 631 on the inner base 2 51, and the inclined direction of the inclined surface on the corresponding pressing member 632 is also opposite. The pushing member 631 on the joint 1 4 can move in the circumferential upper limit direction and control the alignment or staggered position of the pushing member 631 and the corresponding pressing member 632 by moving the pushing member 631. Figure 3 and Figure 5 As shown, when the connector 14 is sleeved on the wire body 1, the corresponding pushing member 631 and the corresponding pressing member 632 are in a misaligned state. At this time, the pushing member 631 can pass through the corresponding pressing member 632 as the inner base body 41 moves. In the process of the connector 14 and the connector 25 being fixedly connected, the outer shell 42 and the inner base body 41 are first moved toward the direction of the connector 25, so that the pushing member 631 on the inner base body 41 passes through the corresponding pressing member 632 smoothly, and then the outer shell 42 and the inner base body 41 are rotated circumferentially so that the pushing member 631 on the inner base body 41 is opposite to the pressing member 632. Figure 5 The state shown in the lower middle view is that at this time, as the inner base body 2 51 moves toward the direction of the inner base body 1 41 until they are abutted together, the pushing member 631 abuts against the inner base body 2 51 and moves to the left with the feeding of the inner base body 2 51, on the one hand, it pushes the corresponding clamping member 632 on the left support ring 62 to move along the radial direction of the support ring 62 to tighten the corresponding limiting fixing frame, and on the other hand, it limits the support ring 62 on the left side so that the support ring 62 is in a stable limited state. At the same time, as the inner base body 2 51 moves toward the direction of the inner base body 1 41 until they are abutted together, the supporting member 633 abuts against the inner base body 1 41 to limit the support ring 62 on the right side, so that the support ring 62 on the right side is in a stable position state, and as the inner base body 2 51 moves, the pushing member 631 thereon pushes the clamping member 632 on the right support ring 62 to move radially to tighten the corresponding limiting fixing frame.

[0029] participate Figure 1 , Figure 2 and Figure 3 A sliding connection member 10 is provided between the inner base body 1 41 and the corresponding support ring 62 and between the inner base body 2 51 and the corresponding support ring 62. The sliding connection member 10 includes a limiting slide groove 101 and a slide rod 102 which is limitedly slidably connected to the limiting slide groove 101. Figure 2As shown, the corresponding limiting slide groove 101 is fixedly connected to the corresponding support ring 62, and the corresponding slide rod 102 is fixedly connected to the inner substrate 51. The inner substrate 51 is slidably connected together through the corresponding limiting slide groove 101 and the slide rod 102. During the connection process of the conductor 8, the inner substrate 51 can be sufficiently far away from the connection end of the conductor 8, leaving sufficient space for connecting the conductors 8 together. Figure 3 As shown, the sliding connection member 10 between the inner base body 41 and the corresponding support ring 62 also includes a rotating ring 103, which is limited and rotatably connected to the corresponding support ring 62, the corresponding limiting slide groove 101 is fixedly connected to the rotating ring 103, and the corresponding slide rod 102 is fixedly connected to the inner base body 41. The inner base body 41 is slidably connected to the corresponding support ring 62 in the axial direction through the corresponding limiting slide groove 101 and the slide rod 102. Similarly, in the process of connecting the conductor 8, the inner base body 41 can be sufficiently away from the connecting end of the conductor 8, leaving sufficient space for connecting the conductor 8 together, and combined with the rotating ring 103 and the corresponding support ring 62 to be rotatably connected in the circumferential direction, thereby realizing the axial movement of the inner base body 41 so that the pushing member 631 on it can smoothly pass through the corresponding clamping member 632, and then rotate to make the pushing member 631 face the corresponding clamping member 632.

[0030] participate Figure 1 , Figure 3 and Figure 4 The clamping body 7 includes a plurality of clamping heads 72 provided with inclined pushing surfaces 71 and a limiting member 74 provided with a supporting head 73. The limiting member 74 corresponds to the clamping heads 72 one by one and the limiting member 74 is axially slidably connected to the joint 4. The clamping heads 72 are distributed along the circumference of the inner substrate 41 and are radially slidably connected to the inner substrate 41. The supporting head 73 is axially slidably connected to the inner substrate 41 and cooperates with the inner substrate 2 51. During the process of the inner substrate 2 51 feeding toward the inner substrate 41, the supporting head 73 abuts against the inner substrate 2 51 and moves with it. During the movement, the clamping head 72 is radially pushed by the limiting member 74 and the inclined pushing surface 71, so that the clamping head 72 clamps and fixes the connection of the conductor 8.

[0031] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flame retardant cable, characterized in that: It comprises a wire body 1 (1) and a wire body 2 (2), wherein the wire core (3) in the wire body 1 (1) corresponds to the wire core (3) in the wire body 2 (2) one by one, and the corresponding wire cores (3) are connected together; A connector 1 (4) is sleeved on the wire body 1 (1) and a connector 2 (5) is sleeved on the wire body 2 (2), the connector 1 (4) and the connector 2 (5) are connected in a relative feeding manner, the connector 1 (4) covers the connection point of the wire core (3) and the connector 1 (4) is in a static state during the connection process; A position-limiting fixing body (6), wherein the position-limiting fixing body (6) respectively positions and fixes the exposed part of the wire core (3) in the wire body 1 (1) and the exposed part of the wire core (3) in the wire body 2 (2); The position-limiting fixed body (6) comprises: a support ring (62) provided with a position-limiting clamp (61), the support ring (62) and the corresponding joint 1 (4) and joint 2 (5) are all slidably connected, the position-limiting clamp (61) corresponds to the wire core (3) and is clamped on the exposed wire core (3), and during the initial position limiting, the wire core (3) and the position-limiting clamp (61) are in a relaxed state; a tightening head (63), the tightening head (63) automatically tightens the position-limiting clamp (61) during the connection process of the joint 1 (4) or the joint 2 (5) so that it is in a tightly limited fixed state with the corresponding wire core (3) and simultaneously limits the support ring (62) in the reverse direction; A pressing body (7) is used to press and fix the connection of the wire core (3) during the process of connecting the second connector (5) with the first connector (4).

2. A flame-retardant cable according to claim 1, characterized in that: The tightening head (63) comprises a pushing member (631) and a pressing member (632) radially slidably connected to the support ring (62). The tightening head (63) in the upper limit fixing body (6) of the second joint (5) further comprises a supporting member (633). The supporting member (633) limits the corresponding support ring (62) through the first joint (4). The corresponding pushing member (631) is fixedly connected to the second joint (5). The pushing member (631) in the upper limit fixing body (6) of the first joint (4) is ) is axially slidably connected to the joint one (4), the contact surfaces of the pushing member (631) and the pressing member (632) are both inclined surfaces that fit each other, and the inclined surface of the pushing member (631) on the joint one (4) is inclined in the opposite direction to the inclined surface of the pushing member (631) on the joint two (5), and the pushing member (631) on the joint one (4) can be moved to an upper limit in the circumferential direction and the alignment or offset between the pushing member (631) and the corresponding pressing member (632) can be controlled by moving the pushing member (631).

3. A flame-retardant cable according to claim 1, characterized in that: The clamping body (7) comprises a plurality of clamping heads (72) provided with inclined pushing surfaces (71) and a limiting member (74) provided with a supporting head (73); the limiting member (74) corresponds to the clamping heads (72) one by one and the limiting member (74) is axially slidably connected to the joint one (4); the clamping heads (72) are distributed along the circumference of the joint one (4) and are radially slidably connected to the joint one (4); the supporting head (73) is in direct contact with the joint two (5) and axially slides synchronously with the limiting member (74) during the process of connecting the joint two (5) with the joint one (4); the limiting member (74) radially pushes the clamping head (72) through the inclined pushing surface (71).

4. A flame-retardant cable according to claim 1 or 2, characterized in that: The joint 1 (4) and the joint 2 (5) are threadedly connected. The joint 1 (4) comprises an inner base 1 (41) and an outer shell 1 (42). The inner base 1 (41) is located inside the outer shell 1 (42) and an extrusion sealing body 1 (43) is arranged between the two. The joint 2 (5) comprises an inner base 2 (51), an outer shell 2 (52) and a rotating shell (53). The rotating shell (53) is threadedly connected to the outer shell 1 (42) and rotatably connected to the outer shell 2 (52). The outer shell 2 (52) is slidably connected to the inner base 2 (51) and an extrusion sealing body 2 (54) is arranged between the two.

5. A flame-retardant cable according to claim 1 or 2, characterized in that: There are a number of limit clamps (61) on the support ring (62), and the limit clamps (61) are distributed along the circumference of the corresponding support ring (62). The limit clamps (61) are arc-shaped structures, and the limit clamps (61) distributed along the circumference of the support ring (62) are connected together in sequence to form a closed limit fixing frame. The limit fixing frame has deformation capability, and the tightening heads (63) are respectively located at the connection points of adjacent limit clamps (61) and abut against the connection points.

6. A flame-retardant cable according to claim 2, characterized in that: A sliding connection member (10) is provided between the joint 1 (4) and the support ring (62) and between the joint 2 (5) and the support ring (62). The sliding connection member (10) includes a limiting sliding groove (101) and a sliding rod (102). The sliding connection member (10) between the joint 1 (4) and the support ring (62) also includes a rotating ring (103). The rotating ring (103) is connected to the corresponding support ring (62) in a limited rotation manner and is fixedly connected to the corresponding limiting sliding groove (101).

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