A fireproof cable

Abstract

The utility model provides a kind of fireproof cable, it is characterized by: including cable body, interval sleeve is set in the fireproof cable of cable body outside, fireproof cable includes several mutually spliced sheath unit, sheath unit includes sleeve, the outer wall of sleeve is circumferentially provided with several interval distribution raceways, several ball bearings are arranged in each raceway and roll, the outer wall of sleeve is provided with retaining cover, retaining cover is provided with pocket hole corresponding each ball bearing on retaining cover, and ball bearing is held in pocket hole and let ball bearing protrude retaining cover.The fireproof cable is set in the fireproof cable of cable body outside interval sleeve with ball bearing, reduce the abrasion generated in the process of cable laying due to drag, simultaneously change sliding friction into rolling friction, reduce the friction in the process of cable drag, facilitate worker to drag cable, improve construction efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of cables, and in particular to a fireproof cable. Background Technology

[0002] Fire-resistant cables are a type of special cable that can maintain normal power transmission for a certain period of time in flames. They are widely used in high-rise buildings, subways, nuclear power plants, large stadiums, and other places with extremely high fire safety requirements. Their core characteristics are high temperature resistance, flame retardancy, and fire resistance. In the event of a fire, they can delay circuit failure, buying time for personnel evacuation and firefighting rescue.

[0003] A Chinese patent with authorization announcement number CN214847854U discloses a flexible fireproof cable, which includes a wire core and a copper-silicon composite tape and a sheath that are sequentially wrapped around the wire core. The wire core includes a conductor and a mica tape wrapped around the conductor. Silicone is provided between the wire core and the copper-silicon composite tape.

[0004] The existing technical solutions mentioned above have the following drawbacks: During the cable laying process, the cable usually needs to be dragged. When the outer sheath of the cable comes into contact with the ground, the friction is large, which not only makes the laying operation laborious and time-consuming, but also easily leads to wear or damage to the outer sheath of the cable, affecting the fire resistance and shortening the service life of the cable. Utility Model Content

[0005] The problem this utility model aims to solve is to provide a fire-resistant cable that addresses the aforementioned shortcomings in the existing technology, thereby resolving the issues of affecting fire resistance and shortening the cable's service life.

[0006] The above-mentioned utility model objective is achieved through the following technical solution: a fireproof cable, including a cable body and an anti-drag sleeve spaced around the outside of the cable body. The anti-drag sleeve includes a plurality of interconnected sheath units. Each sheath unit includes a sleeve fitted onto the cable body. The outer wall of the sleeve has a plurality of spaced raceways circumferentially distributed. A plurality of balls are rolled in each raceway. A retaining cap is provided on the outer wall of the sleeve. The retaining cap has a pocket corresponding to each ball to hold the ball and allow the ball to protrude out of the retaining cap.

[0007] The present invention is further configured such that: the outer wall of the sleeve is provided with a plurality of slots spaced apart, and the inner wall of the retaining cover is provided with a plurality of insert plates that are inserted into the slots at intervals.

[0008] The present invention is further configured such that the insert plate and the slot are fixed by adhesive bonding.

[0009] The present invention is further configured such that the inner wall of the sleeve has anti-slip texture.

[0010] The present invention is further configured such that: both ends of the outer wall of the sleeve are provided with connecting plates, the connecting plates of adjacent sleeves are fitted together, the connecting plates are provided with locking holes that can be aligned with each other, and locking fasteners for locking adjacent sheath units are inserted into the adjacent aligned locking holes.

[0011] The present invention is further configured such that: the locking device includes a column shell, the column shell has several adjacent and aligned locking holes, a column cavity is formed on the top surface of the column shell, an upper fixing plate is provided on the outer side wall of the column shell that abuts against the top surface of the upper connecting plate, a number of movable plate guide holes are formed on the outer side wall of the column shell, a lower movable plate that abuts against the bottom surface of the lower connecting plate is slidably arranged in the movable plate guide holes, and a movable plate assembly is provided in the column cavity to drive the lower movable plate to reciprocate linearly along the movable plate guide holes.

[0012] The present invention is further configured such that: the moving plate assembly includes a moving plate central shaft and a moving plate connecting rod; the moving plate central shaft is movably disposed at the center of the column cavity; a plurality of inner hinge frames are disposed on the moving plate central shaft; an outer hinge frame is disposed at the end of the lower moving plate near the moving plate central shaft; one end of the moving plate connecting rod is hinged to the moving rod central shaft through the inner hinge frame, and the other end is hinged to the lower moving plate through the outer hinge frame; the hinge point between the moving plate connecting rod and the inner hinge frame is located on the upper inner side of the hinge point between the moving plate connecting rod and the outer hinge frame.

[0013] The present invention is further configured such that: an upper guide plate and a lower guide plate are coaxially arranged on the central shaft of the moving plate, and the upper guide plate and the lower guide plate slide in cooperation with the column cavity.

[0014] The present invention is further configured such that: a lower limit shaft hole and an upper limit shaft hole are provided on the upper part of the outer side wall of the column shell, the lower limit shaft hole is located above the upper fixed plate, and the upper limit shaft hole is located above the lower limit shaft hole; a limit shaft groove is provided on the side wall of the upper guide plate; a limit shaft buckle that engages with the lower limit shaft hole or the upper limit shaft hole is slidably disposed in the limit shaft groove; a limit shaft spring is provided in the limit shaft groove, one end of the limit shaft spring is connected to the bottom of the limit shaft groove, and the other end is connected to the limit shaft buckle.

[0015] The present invention is further configured such that a top shaft spring is provided between the lower guide plate and the bottom wall of the column cavity.

[0016] In summary, the beneficial technical effects of this utility model are as follows:

[0017] (1) This fireproof cable reduces wear caused by dragging during cable laying by installing anti-drag sleeves with ball bearings at intervals on the outside of the cable body. At the same time, it transforms sliding friction into rolling friction, reduces the friction during cable dragging, makes it easier for workers to drag the cable, and improves construction efficiency.

[0018] (2) The anti-drag sleeve in this fireproof cable is composed of several sheath units spliced ​​together. The sheath units are locked together by fasteners. The anti-drag sleeve is easy to disassemble and has the characteristics of being easy to disassemble and reusable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the fireproof cable in this utility model;

[0020] Figure 2 This is a cross-sectional view of the sheath unit in this utility model;

[0021] Figure 3 This is an exploded structural diagram of the sheath unit in this utility model;

[0022] Figure 4 This is a cross-sectional view of the locking device in this utility model.

[0023] In the above attached figures: 1. Cable body; 2. Anti-drag sleeve; 3. Sleeve; 4. Roller track; 5. Ball bearing; 6. Retaining cover; 7. Pocket; 8. Slot; 9. Insert plate; 10. Anti-slip texture; 11. Connecting plate; 12. Locking hole; 13. Locking fastener; 14. Column housing; 15. Column cavity; 16. Upper fixed plate; 17. Moving plate guide hole; 18. Lower movable plate; 19. Moving plate central shaft; 20. Moving plate connecting rod; 21. Inner hinge frame; 22. Outer hinge frame; 23. Upper guide plate; 24. Lower guide plate; 25. Lower limit shaft hole; 26. Upper limit shaft hole; 27. Limit shaft groove; 28. Limit shaft sliding buckle; 29. ​​Limit shaft spring; 30. Top shaft spring. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figure 1 As shown, this utility model proposes a fireproof cable, including a cable body 1 and anti-drag sleeves 2 that are spaced out and sleeved on the outside of the cable body 1.

[0026] like Figure 2 and 3As shown, the anti-drag sleeve 2 includes several interconnected sheath units. In this embodiment, there are two sheath units. Each sheath unit includes a sleeve 3, balls 5, and a retaining cap 6. The sleeve 3 is semi-cylindrical and is fitted onto the cable body 1. The side of the sleeve 3 closest to the cable body 1 is the inner wall, and the side of the sleeve 3 furthest from the cable body 1 is the outer wall. The outer wall of the sleeve 3 has several spaced raceways 4 circumferentially distributed. Several balls 5 are rolled in each raceway 4. The retaining cap 6 is provided on the outer wall of the sleeve 3. The retaining cap 6 has a pocket 7 corresponding to each ball 5, which holds the ball 5 and allows the ball 5 to protrude from the retaining cap 6. The retaining cap 6 confines the ball 5 within the raceway 4. The retaining cap 6 separates the balls 5 independently through the pocket 7, maintaining a uniform gap between the balls 5 and avoiding direct contact and friction between them.

[0027] like Figure 3 As shown, the outer wall of the sleeve 3 has several spaced slots 8 arranged circumferentially, and the cross-section of the slots 8 is semi-circular. The retaining cover 6 is made of rubber and is elastic, making it easy for workers to insert the balls 5 into the raceways 4 through the pockets 7. The retaining cover 6 also has good wear resistance. Several insert plates 9 are spaced apart on the inner wall of the retaining cover 6. The insert plates 9 are semi-circular plates that are inserted into the slots 8. When installing the retaining cover 6, glue is first applied to the insert plates 9. After the insert plates 9 are inserted into the slots 8, they are fixed to the slots 8 by adhesive bonding.

[0028] This fireproof cable reduces wear caused by dragging during cable laying by installing anti-drag sleeves 2 with ball bearings 5 ​​at intervals on the outside of the cable body 1. At the same time, it transforms sliding friction into rolling friction, reduces the friction force during cable dragging, makes it easier for workers to drag the cable, and improves construction efficiency.

[0029] like Figure 3 As shown, the inner wall of the sleeve 3 has anti-slip texture 10. The anti-slip texture 10 is used to increase the friction between the anti-drag sleeve 2 and the cable body 1, and to a certain extent restrict the relative sliding between the cable body 1 and the anti-drag sleeve 2.

[0030] like Figure 1 and 4 As shown, both ends of the outer wall of the sleeve 3 are fixedly connected to the connecting plate 11. The connecting plates 11 of adjacent sleeves 3 are in contact with each other. The connecting plate 11 is provided with locking holes 12 that can be aligned with each other. Locking fasteners 13 are passed through the two aligned locking holes 12. The locking fasteners 13 are used to lock the sheath units that are spliced ​​together.

[0031] like Figure 1 and 4As shown, the locking device 13 includes a cylindrical shell 14 with two aligned locking holes 12 extending through it. A cylindrical cavity 15 is formed on the top surface of the shell 14. An upper fixing plate 16 is coaxially fixed to the upper part of the outer wall of the shell 14, and the cross-section of the upper fixing plate 16 is annular. Four movable plate guide holes 17 are circumferentially formed on the lower part of the outer wall of the shell 14. A lower movable plate 18 is slidably disposed in each movable plate guide hole 17. A movable plate assembly is disposed in the cylindrical cavity 15 to drive the lower movable plate 18 to reciprocate linearly along the movable plate guide holes 17.

[0032] When the locking fastener 13 is installed, the upper fixed plate 16 abuts against the top surface of the upper connecting plate 11, and the moving plate assembly drives the lower movable plate 18 to slide out of the moving plate guide hole 17. The lower movable plate 18 abuts against the bottom surface of the lower connecting plate 11. Then the upper fixed plate 16 and the lower movable plate 18 cooperate to lock and fix the two connecting plates 11 that are in contact, thereby achieving the purpose of locking the two sheath units.

[0033] like Figure 1 and 4 As shown, the movable plate assembly includes a movable plate central shaft 19 and a movable plate connecting rod 20. The cylindrical movable plate central shaft 19 is movably disposed at the center of the cylindrical cavity 15. Four inner hinge frames 21 with pins are equidistantly arranged on the circumference of the middle part of the movable plate central shaft 19. An outer hinge frame 22 with a pin is provided at the end of the lower movable plate 18 near the movable plate central shaft 19. One end of the movable plate connecting rod 20 is hinged to the movable rod central shaft through the inner hinge frame 21, and the other end is hinged to the lower movable plate 18 through the outer hinge frame 22. The movable plate connecting rod 20 is hinged to the inner hinge frame 21 and the outer hinge frame 22 respectively by means of pins. The hinge point between the movable plate connecting rod 20 and the inner hinge frame 21 is located on the upper inner side of the hinge point between the movable plate connecting rod 20 and the outer hinge frame 22.

[0034] like Figure 4 As shown, a disc-shaped upper guide plate 23 is coaxially fixed to the upper end of the moving plate central shaft 19, and a disc-shaped lower guide plate 24 is coaxially fixed to the lower end of the moving plate central shaft 19. Both the upper guide plate 23 and the lower guide plate 24 are slidably engaged with the cylindrical cavity 15, so the moving plate central shaft 19 can stably move at the center of the cylindrical cavity 15.

[0035] like Figure 4 As shown, the upper part of the outer side wall of the column shell 14 is provided with a lower limit shaft hole 25 and an upper limit shaft hole 26. Both the lower limit shaft hole 25 and the upper limit shaft hole 26 are circular holes. The lower limit shaft hole 25 is located above the upper fixing plate 16, and the upper limit shaft hole 26 is located above the lower limit shaft hole 25.

[0036] like Figure 4As shown, a limiting axis groove 27 is formed on the side wall of the upper guide plate 23. The limiting axis groove 27 can be aligned with the lower limiting axis hole 25 or the upper limiting axis hole 26. A limiting axis latch 28 is slidably disposed in the limiting axis groove 27. The limiting axis latch 28 can engage with the lower limiting axis hole 25 or the upper limiting axis hole 26. The limiting axis latch 28 is a cylinder with a hemispherical head. A limiting axis spring 29 is disposed in the limiting axis groove 27. One end of the limiting axis spring 29 is connected to the bottom of the limiting axis groove 27, and the other end is connected to the limiting axis latch 28. When the limiting axis spring 29 pushes the limiting axis latch 28 to slide out of the limiting axis groove 27 and engage with the lower limiting axis hole 25 or the upper limiting axis hole 26, the moving plate central shaft 19 is restricted from moving up and down.

[0037] like Figure 4 As shown, a top shaft spring 30 is provided between the bottom wall of the lower guide plate 24 and the column cavity 15. The elastic force generated by the reset of the top shaft spring 30 will push the moving plate central shaft 19 upward on the lower guide plate 24.

[0038] In this embodiment, the detailed disassembly process of the locking fastener 13 is as follows: The worker presses the limiting shaft sliding buckle 28, causing the limiting shaft sliding buckle 28 to slide out of the lower limiting shaft hole 25 and retract into the limiting shaft sliding groove 27. The elastic force generated by the top shaft spring 30 resetting acts on the lower guide plate 24, which will push the moving plate central shaft 19 upward. Since the hinge point between the moving plate connecting rod 20 and the inner hinge frame 21 is located on the upper inner side of the hinge point between the moving plate connecting rod 20 and the outer hinge frame 22, the moving plate connecting rod 20 will pull the outer end of the lower movable plate 18 into the moving plate guide hole 17. Then, the locking fastener 13 can be pulled out upward.

[0039] The anti-drag sleeve 2 in this fireproof cable is composed of several sheath units spliced ​​together. The sheath units are locked together by fasteners 13. The anti-drag sleeve 2 is easy to disassemble and has the characteristics of being easy to disassemble and reusable.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fire-resistant cable, characterized in that: The cable includes a cable body (1) and anti-drag sleeves (2) spaced around the outside of the cable body (1). The anti-drag sleeves (2) include several interconnected sheath units. Each sheath unit includes a sleeve (3) fitted onto the cable body (1). The outer wall of the sleeve (3) has several circumferentially spaced raceways (4). Several balls (5) are rolled in each raceway (4). A retaining cover (6) is provided on the outer wall of the sleeve (3). The retaining cover (6) has a pocket (7) corresponding to each ball (5) to hold the ball (5) and allow the ball (5) to protrude from the retaining cover (6). The outer wall of the sleeve (3) has several circumferentially spaced slots (8). The inner wall of the retaining cover (6) has several insert plates (9) spaced apart to be inserted into the slots (8). The insert plates (9) are fixed to the slots (8) by adhesive bonding. The inner wall of the sleeve (3) has anti-slip textures (10). Both ends of the outer wall of the sleeve (3) are provided with connecting plates (11). The connecting plates (11) of adjacent sleeves (3) are fitted together. The connecting plates (11) are provided with locking holes (12) that can be aligned with each other. The locking holes (12) that are aligned with each other are provided with locking fasteners (13) for locking adjacent sheath units. The locking fastener (13) includes a column shell (14), through which several adjacent and aligned locking holes (12) are passed. A column cavity (15) is formed on the top surface of the column shell (14). An upper fixing plate (16) is provided on the outer side wall of the column shell (14) and abuts against the top surface of the upper connecting plate (11). Several movable plate guide holes (17) are formed on the outer side wall of the column shell (14). A lower movable plate (18) is slidably disposed in the movable plate guide hole (17) and abuts against the bottom surface of the lower connecting plate (11). A movable plate assembly is provided in the column cavity (15) to drive the lower movable plate (18) to reciprocate linearly along the movable plate guide hole (17). The moving plate assembly includes a moving plate central shaft (19) and a moving plate connecting rod (20). The moving plate central shaft (19) is movably disposed at the center of the column cavity (15). Several inner hinge frames (21) are provided on the moving plate central shaft (19). An outer hinge frame (22) is provided at the end of the lower moving plate (18) near the moving plate central shaft (19). One end of the moving plate connecting rod (20) is hinged to the moving rod central shaft through the inner hinge frame (21), and the other end is hinged to the lower moving plate (18) through the outer hinge frame (22). The hinge point between the moving plate connecting rod (20) and the inner hinge frame (21) is located on the upper inner side of the hinge point between the moving plate connecting rod (20) and the outer hinge frame (22). An upper guide plate (23) and a lower guide plate (24) are coaxially disposed on the moving plate central shaft (19). The upper guide plate (23) and the lower guide plate (24) slide in cooperation with the column cavity (15).The upper part of the outer wall of the cylindrical shell (14) is provided with a lower limit shaft hole (25) and an upper limit shaft hole (26). The lower limit shaft hole (25) is located above the upper fixing plate (16), and the upper limit shaft hole (26) is located above the lower limit shaft hole (25). A limit shaft groove (27) is provided on the side wall of the upper guide plate (23). A limit shaft buckle (28) that engages with the lower limit shaft hole (25) or the upper limit shaft hole (26) is slidably disposed in the limit shaft groove (27). A limit shaft spring (29) is disposed in the limit shaft groove (27). One end of the limit shaft spring (29) is connected to the bottom of the limit shaft groove (27), and the other end is connected to the limit shaft buckle (28). A top shaft spring (30) is disposed between the lower guide plate (24) and the bottom wall of the cylindrical cavity (15).

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