A retractable cable tray

Abstract

The invention discloses a retractable cable bridge, which relates to the technical field of cable bridges and comprises a wire box, wherein a box cover is arranged above the wire box, a clamping body is arranged inside the wire box, a plurality of grooves are arranged on the inner wall of the wire box, the ends of the clamping body are located at the inner wall of the grooves, a plurality of wire clamping parts are arranged on one side of the clamping body, the wire clamping parts comprise a C-shaped plate located on one side of the clamping body, a fixing rod 1 and a fixing rod 2 are arranged between the C-shaped plates, the outer wall of the fixing rod 1 is provided with two clamping rings 1 for clamping the cable, and the outer wall of the fixing rod 2 is provided with two clamping rings 2; a switching unit for driving the clamping ring 2 to clamp the outer wall of the cable is arranged on one side of the clamping body, and the switching unit is used to prevent the clamping ring 1 from contacting the outer wall of the cable for a long time. In this device, the contact time between the clamping part and the cable surface is reduced to the greatest extent, so that the damage to the cable is greatly reduced, and the working environment is made safer.

Description

Technical Field

[0001] The invention relates to the technical field of cable bridges, in particular to a retractable cable bridge. Background Art

[0002] Cable tray is a kind of equipment widely used in power transmission and distribution system, mainly used to protect and guide various cable lines, so that they can be laid safely, reliably and economically in a certain protective space. Cable tray is widely used in modern society because it has good performance, such as high strength, good stability, fire resistance, waterproof, etc., which can meet the needs of various cable lines.

[0003] The common cable tray is usually composed of a box and a cover that wrap the cable inside, and then the cable is fixed by a bracket, a support arm and installation accessories. Since the installation environment of the cable is relatively complex, the installation direction of the cable is changeable, so wire clamps are often installed inside the tray to assist in clamping the outer wall of the cable to ensure that the cable has a stable installation environment; however, the structure of such wire clamps is usually fixed and has poor elasticity. When the ambient temperature of the cable tray installation varies greatly, the rubber outer wall of the cable is prone to slight expansion in a high temperature environment, which in turn squeezes the inner wall of the wire clamp, which can easily cause wear of the outer wall of the cable during long-term operation, and exposed wires may cause fire and other safety accidents.

[0004] To this end, the present invention proposes a retractable cable tray. Summary of the invention

[0005] The purpose of the present invention is to provide a retractable cable tray to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a retractable cable tray, comprising a wire box, a box cover is provided above the wire box,

[0006] A clamping body is provided inside the wire box, and a plurality of grooves are provided on the inner wall of the wire box. The end of the clamping body is located at the inner wall of the groove. A plurality of wire clamping parts are provided on one side of the clamping body. The wire clamping parts include a C-shaped plate located on one side of the clamping body, and a fixing rod 1 and a fixing rod 2 are provided between the C-shaped plates. Two clamping rings 1 for clamping the cable are provided on the outer wall of the fixing rod 1, and two clamping rings 2 are provided on the outer wall of the fixing rod 2;

[0007] A switching unit is provided on one side of the clamp body to drive the second clamp ring to clamp the outer wall of the cable, and the switching unit is used to prevent the first clamp ring from contacting the outer wall of the cable for a long time and to dissipate heat on the cable surface;

[0008] A protection unit is provided inside the clamping ring 2, which can provide flame retardancy to the cable surface when smoke appears in the cable box.

[0009] Preferably, the switching unit includes a moving rod located between the clamping ring 1 and the clamping ring 2, the moving rod includes a tapered portion and a sliding portion, a sliding rod is provided at the bottom end of the sliding portion, the sliding rod passes through the clamping body and is slidably connected thereto, a ring body is provided above the sliding rod, an intermittent gear is provided inside the ring body, an inner wall of the ring body includes two rows of tooth blocks meshing with the intermittent gear, a connecting shaft is provided inside the intermittent gear, a bevel gear 1 is provided on the outer wall of the connecting shaft, a bevel gear 1 is provided on one side of the bevel gear 1 and a bevel gear 2 meshing therewith is provided, and a bevel gear 2 is provided on one side of the bevel gear 2 A micro motor is provided, the rotating shaft of the micro motor is located on the inner wall of bevel gear 2 and fixedly connected thereto, a temperature sensor is provided on one side of the clamp, the temperature sensor is electrically connected to the micro motor, a fan blade is provided on the outer wall of the connecting shaft, a cover body is provided on the outside of the fan blade, the cover body includes an air inlet and an air outlet, an air pipe 1 is provided at the end of the air outlet, the air pipe 1 passes through the clamp and a box body is provided at one end of the air pipe 1, two through holes are provided on the top of the box body, a connecting rod is also provided on the top of the box body, the connecting rod is located on the outer wall of the sliding part and slides relative to it.

[0010] Preferably, the protection unit includes a cooling box located inside the box body, the interior of the cooling box contains a refrigerant, a baffle is provided inside the cooling box, the upper end of the baffle is fixedly connected to the inner wall of the box body, the bottom end of the baffle is located inside the box body and blocks the square hole of the box body, an electromagnet is provided inside the box body, a smoke sensor is provided on one side of the clamp body, the smoke sensor is electrically connected to the electromagnet, and the electromagnet has a magnetic force of mutual attraction with the outer wall of the box body when powered on, an air pipe 2 is provided on the outer wall of the box body, a U-shaped tube is provided at the end of the air pipe 2, the interior of the clamp ring 2 is a cavity, the two upper ends of the U-shaped tube are respectively located at the bottom of the two clamp rings 2 and connected to each other, an arc cover is provided inside the clamp ring 2, and a plurality of circular holes are provided inside the arc cover and the clamp ring 2.

[0011] Preferably, when the interior of the clamping ring 2 is filled with gas, the central axes of the arc-shaped cover and the circular hole inside the clamping ring 2 are aligned with each other.

[0012] Preferably, a special-shaped rod is provided at the end of the sliding rod, a shield is provided at the upper end of the special-shaped rod, the outer wall of the wire box has a through slot, and the shield shields the through slot.

[0013] Preferably, the gas flowing through the through slot is on the same straight line as the direction of the cables in the wire box.

[0014] Preferably, a plurality of equally spaced magnetic sheets are provided inside the slot body, the magnetic sheets and two ends of the clamp body have a magnetic force of attraction, and the clamp body slides freely inside the slot body.

[0015] Preferably, there is a magnetic force of mutual attraction between the two clamping rings one, and there is a magnetic force of mutual attraction between the two clamping rings two.

[0016] The present invention has at least the following beneficial effects:

[0017] 1. In the present invention, when the temperature in the wire box rises to a preset height, the micro motor will drive the bevel gear 2 and the bevel gear 1 to transmit, and the slide rod will drive the moving rod to reciprocate left and right. During this process, under the resistance of the conical part and the side wall of the clamping ring 1, the two clamping rings 1 will open to each other. At the same time, the clamping ring 2 loses the resistance effect of the other conical part of the moving rod and will approach each other until it fits together, so that the clamping ring 2 can effectively clamp the outer wall of the cable; therefore, through the continuous rotation of the intermittent gears, the clamping ring 1 and the clamping ring 2 will form an intermittent opening and closing action, which can minimize the contact time between the clamping component and the cable surface in a high temperature environment, greatly reduce the damage to the cable, and make the working environment safer.

[0018] 2. In the present invention, the connecting shaft drives the fan blades to rotate, thereby driving the gas to be supplied to the interior of the box body through the air pipe, and then discharged from the two through-holes of the box body. The discharged gas can keep the air directly below the cable in a circulating state; at the same time, the reciprocating sliding rod will also drive the shield to move, so that the through slot loses its shielding, and the outside air flows into the wire box and flows along the direction of the cable placement, providing outside air for the air inlet of the cover body, thereby reducing the surface temperature of the cable and reducing the adverse effects on the cable due to thermal expansion.

[0019] 3. In the present invention, when there is smoke inside the wire box, the smoke sensor will send an electrical signal to the electromagnet and energize it. The magnetic force causes the cooling box to rise and adsorb to the inner wall of the box body. In this state, the through hole has been blocked, and the square hole of the cooling box has lost the shielding of the baffle. Therefore, the gas entering the box body will cause the condensing agent inside the cooling box to enter the inside of the clamp ring 2. The continuously supplied gas will push out the arc cover inside the clamp ring 2, wrap the cable above the clamp ring 2 in multiple directions, and finally spray the condensing agent from the circular holes of the clamp ring 2 and the arc cover, so that it adheres to the surface of the cable, and timely flame retards the outer wall of the cable and its surroundings, thereby reducing the safety loss caused by accidental fire of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a side view of the overall structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of a single wire clamping component in the wire box of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the switching unit of the present invention;

[0024] Figure 5 For the present invention Figure 4 A magnified view of the structure of the middle A area;

[0025] Figure 6 This is a schematic structural diagram of the switching unit of the present invention from another angle;

[0026] Figure 7 For the present invention Figure 6 A magnified view of the structure of the middle B region;

[0027] Figure 8 This is a cross-sectional view of the second structure of the clamping ring of the present invention;

[0028] Fig. 9 It is a cross-sectional view of the switching unit and the protection unit structure of the present invention;

[0029] Fig.10 For the present invention Fig. 9 A magnified view of the structure of the middle C region;

[0030] Fig.11 For the present invention Fig. 9 A magnified view of the structure of the middle D region;

[0031] Fig.12 This is a cross-sectional view of the cooling box structure of the present invention.

[0032] In the figure: 1-wire box; 2-box cover; 3-clamp body; 4-trough body; 5-clamping part; 6-C-shaped plate; 7-fixing rod 1; 8-fixing rod 2; 9-clamping ring 1; 10-clamping ring 2; 11-switching unit; 12-protection unit; 13-moving rod; 14-conical part; 15-sliding part; 16-sliding rod; 17-ring body; 18-intermittent gear; 19-tooth block; 20-connecting shaft; 21-bevel gear 1; 22-bevel gear 2; 23- Micro motor; 24-temperature sensor; 25-fan blades; 26-hood; 27-air inlet; 28-air outlet; 29-trachea 1; 30-box; 31-through hole; 32-connecting rod; 33-cooling box; 34-condensing agent; 35-baffle; 36-electromagnet; 37-smoke sensor; 38-trachea 2; 39-U-shaped tube; 40-arc hood; 41-round hole; 42-special-shaped rod; 43-shield; 44-through slot; 45-magnetic sheet. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-12 The present invention provides a technical solution: a retractable cable tray, comprising:

[0035] Embodiment 1,

[0036] A wiring box 1 is provided with a box cover 2 on the top of the wiring box 1, and the box cover 2 can slide freely on the top of the wiring box 1. A clamp 3 is provided inside the wiring box 1, and a plurality of grooves 4 are provided on the inner wall of the wiring box 1. There are two grooves 4, and the side walls of each groove are fixedly connected to the inner wall of the wiring box 1. The end of the clamp 3 is located at the inner wall of the groove 4, and a plurality of equidistantly distributed magnetic sheets 45 are provided inside the groove 4 and are fixedly connected thereto. The magnetic sheets 45 and the two ends of the clamp 3 have an attractive magnetic force, and the clamp 3 slides freely inside the groove 4; the magnetic adsorption effect of the end of the clamp 3 and the magnetic sheet 45 can be used to limit the position of the clamp 3 inside the wiring box 1, so that the support point of the clamp 3 for the cable can be freely changed, so as to be suitable for different cable installation scenarios, thereby improving the applicability of this cable tray.

[0037] Furthermore, a plurality of wire clamping components 5 are provided on one side of the clamping body 3, and the wire clamping component 5 includes a C-shaped plate 6 located on one side of the clamping body 3, and both ends of the C-shaped plate 6 are fixedly connected to the clamping body 3, and a fixing rod 1 7 and a fixing rod 2 8 are provided between the C-shaped plates 6, and both ends of the fixing rod 1 7 and the fixing rod 2 8 are fixedly connected to the C-shaped plate 6, and the outer wall of the fixing rod 1 7 is provided with two clamping rings 1 9 for clamping the cable, and the clamping ring 1 9 slides freely on the outer wall of the fixing rod 1 7, and the outer wall of the fixing rod 2 8 is provided with two clamping rings 2 10, and the clamping ring 2 10 slides freely on the outer wall of the fixing rod 2 8, and there is a magnetic force of mutual attraction between the two clamping rings 1 9, and there is a magnetic force of mutual attraction between the two clamping rings 2 10, and the ends of the clamping rings 1 9 and the clamping ring 2 10 are both arc-shaped, which can be adaptively contacted with the outer wall of the cable, so that the cable clamping is more stable;

[0038] A switching unit 11 is provided on one side of the clamp body 3 for driving the clamping ring 2 10 to clamp the outer wall of the cable. The switching unit 11 is used to prevent the clamping ring 1 9 from being in contact with the outer wall of the cable for a long time and to dissipate heat from the surface of the cable. When the temperature inside the wiring box 1 is high, the switching unit 11 will automatically function to put the clamping ring 1 9 and the clamping ring 2 10 in an intermittent clamping effect, thereby preventing the cable from being in contact with a certain clamping ring for a long time, and providing heat dissipation protection for the cable, reducing the damage to the cable caused by high temperature, and making the working environment safer.

[0039] The switching unit 11 includes a moving rod 13 located between the clamping ring 1 9 and the clamping ring 2 10, and the moving rod 13 includes a tapered portion 14 and a sliding portion 15. The bottom end of the sliding portion 15 is provided with a sliding rod 16 and is fixedly connected thereto. The sliding rod 16 is L-shaped. The sliding rod 16 passes through the clamping body 3 and is slidably connected thereto. A ring body 17 is provided above the sliding rod 16 and is fixedly connected thereto. An intermittent gear 18 is provided inside the ring body 17. The inner wall of the ring body 17 includes two rows of tooth blocks 19 that mesh with the intermittent gear 18. A connecting shaft 20 is provided inside the intermittent gear 18 and is fixedly connected thereto. A bevel gear 1 21 is provided on the outer wall of the connecting shaft 20 and is fixedly connected thereto. The connecting shaft 20 is fixedly connected to the clamping body 3 through a fixing frame. The connecting shaft 20 is rotatably connected to the fixing frame. A bevel gear 2 22 meshing therewith is provided on one side of the bevel gear 1 21, and a micro motor 23 is provided on one side of the bevel gear 22. The micro motor 23 is fixedly connected to the clamp body 3 through a fixing frame, the rotating shaft of the micro motor 23 is located on the inner wall of the bevel gear 22 and is fixedly connected thereto, a temperature sensor 24 is provided on one side of the clamp body 3 and is fixedly connected thereto, the temperature sensor 24 is electrically connected to the micro motor 23, a fan blade 25 is provided on the outer wall of the connecting shaft 20 and is fixedly connected thereto, a cover body 26 is provided on the outside of the fan blade 25, one end of the cover body 26 is fixedly connected to the clamp body 3, the cover body 26 includes an air inlet 27 and an air outlet 28, an air pipe 29 is provided at the end of the air outlet 28 and is connected thereto, the air pipe 29 passes through the clamp body 3 and is fixedly connected thereto, a box body 30 is provided at one end of the air pipe 29 and is connected thereto, two through holes 31 are provided on the top of the box body 30, a connecting rod 32 is also provided on the top of the box body 30 and is fixedly connected thereto, the connecting rod 32 is located on the outer wall of the sliding portion 15 and slides relative to it;

[0040] The switching unit 11 can drive the opening and closing states between the two clamping rings 1 9 and the two clamping rings 2 10 to achieve an intermittent squeezing mode between the clamping rings and the cable surface, thereby avoiding damage to the cable caused by long-term expansion of the cable skin due to high temperature.

[0041] During use, when the temperature in the wire box 1 rises to a preset height, the temperature sensor 24 on one side of the clamp body 3 sends a start signal to the micro motor 23, and then the micro motor 23 will drive the bevel gear 22 and the bevel gear 1 21 to transmit, and then drive the connecting shaft 20 to drive the intermittent gear and the two rows of tooth blocks 19 inside the ring body 17 to produce a transmission effect. When the intermittent gear is engaged with the upper and lower rows of tooth blocks 19 in the ring body 17, the displacement directions of the slide bar 16 are not the same. Therefore, the slide bar 16 will drive the moving rod 13 to perform reciprocating translational motion in the left and right directions. During this process, when the tapered portion 14 of the moving rod 13 enters the middle of the two clamp rings 19, When the two clamping rings 19 are in contact with each other, the two clamping rings 19 will open to each other under the resistance of the conical part 14 and the side wall of the clamping ring 19, so that the cable above the clamping ring 19 is in a loose state. At the same time, the clamping ring 2 10 loses the resistance effect of the other conical part 14 of the moving rod 13, and will approach each other until it fits together under the magnetic attraction of each other, so that the clamping ring 2 10 can effectively clamp the outer wall of the cable; therefore, through the continuous rotation of the intermittent gear 18, the clamping rings 19 and the clamping rings 2 10 will form an intermittent opening and closing action, which can minimize the contact time between the clamping components and the cable surface in a high temperature environment, greatly reduce the damage to the cable, and make the working environment safer;

[0042] In addition, a special-shaped rod 42 is provided at the end of the slide rod 16 and fixedly connected thereto. The special-shaped rod 42 is shaped in a vertical fold line. A shield plate 43 is provided at the upper end of the special-shaped rod 42 and fixedly connected thereto. The outer wall of the wire box 1 has a through groove 44. The shield plate 43 shields the through groove 44. The gas flowing through the through groove 44 is on the same straight line as the direction of the cable in the wire box 1.

[0043] The rotating connecting shaft 20 will also drive the fan blades 25 on its outer wall to rotate, thereby driving the gas to be supplied to the interior of the box body 30 through the air pipe 29, and then discharged from the two through holes 31 of the box body 30. Because the position of the through hole 31 is between the clamping ring 1 9 and the clamping ring 2 10, the gas discharged from the inside of the through hole 31 can keep the air directly below the cable in a circulating state; at the same time, the reciprocating sliding rod 16 will also drive the shield plate 43 at the end of the special-shaped rod 42 to move, so that the through groove 44 of the wire box 1 loses its shielding, and the outside air flows into the wire box 1 and flows along the placement direction of the cable, providing a steady stream of outside air for the air inlet 27 of the cover body 26, so that the surface temperature of the cable is reduced, reducing the adverse effects of thermal expansion on the cable.

[0044] According to the above embodiment, embodiment 2,

[0045] A protection unit 12 is provided inside the clamp ring 10 to provide flame retardancy to the cable surface when thick smoke appears in the cable box 1;

[0046] The protection unit 12 includes a cooling box 33 located inside the box body 30, one side of the cooling box 33 is attached to the inner wall of the box body 30, and the cooling box 33 can slide up and down inside the box body 30, and the cooling box 33 is loaded with a condensing agent 34, and a baffle 35 is provided inside the cooling box 33, and the baffle 35 slides relative to the cooling box 33, and the upper end of the baffle 35 is fixedly connected to the inner wall of the box body 30, and the bottom end of the baffle 35 is located inside the box body 30 and blocks the square hole of the box body 30, and an electromagnet 36 is provided inside the box body 30 and fixedly connected thereto, and a smoke sensor 37 is provided on one side of the clamp 3 and fixedly connected thereto, and the smoke sensor 37 is electrically connected to the electromagnet 36, and the electromagnet When powered on, 36 has a magnetic force of mutual attraction with the outer wall of the box body 30. The outer wall of the box body 30 is provided with a second air pipe 38 and is fixedly connected thereto. The end of the second air pipe 38 is provided with a U-shaped tube 39 and is connected thereto. The interior of the second clamping ring 10 is a cavity. The two upper ends of the U-shaped tube 39 are respectively located at the bottom of the two second clamping rings 10 and are connected thereto. The interior of the second clamping ring 10 is provided with an arc cover 40, which slides freely inside the second clamping ring 10. The interiors of the arc cover 40 and the second clamping ring 10 are both provided with a plurality of circular holes 41. When the interior of the second clamping ring 10 is filled with gas, the central axes of the arc cover 40 and the circular holes 41 inside the second clamping ring 10 are aligned with each other.

[0047] On the basis of the operation of the micro motor 23, when the smoke sensor 37 detects that there is smoke inside the wire box 1, the smoke sensor 37 will send an electrical signal to the electromagnet 36 and energize it, and then the magnetic force generated by the electromagnet 36 will cause the cooling box 33 to rise and allow its upper surface to be adsorbed on the inner wall of the box body 30. In this state, the through hole 31 has been blocked, and the position of the square hole of the cooling box 33 has lost its shielding due to the displacement with the baffle 35. Therefore, the gas entering the box body 30 will be transported to the inside of the air pipe 2 38 through the cooling box 33, and then the condensing agent 34 inside the cooling box 33 will enter the inside of the clamp ring 2 10. The continuously supplied gas will push out the arc cover 40 inside the clamp ring 2 10, and the condensing agent 34 will eventually be ejected from the circular holes 41 of the clamp ring 2 10 and the arc cover 40, so that it adheres to the surface of the cable, and the outer wall of the cable and its surroundings are flame-retarded in time, reducing the safety loss caused by accidental fire of the cable.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A retractable cable tray, comprising a wire box (1), wherein a box cover (2) is provided above the wire box (1). Features: The wire box (1) has a clamping body (3) inside, and the inner wall of the wire box (1) is provided with a plurality of grooves (4), the end of the clamping body (3) is located at the inner wall of the groove (4), and one side of the clamping body (3) is provided with a plurality of wire clamping components (5), and the wire clamping components (5) include a C-shaped plate (6) located on one side of the clamping body (3), and a fixing rod (7) and a fixing rod (8) are provided between the C-shaped plates (6), and the outer wall of the fixing rod (7) is provided with two clamping rings (9) for clamping the cable, and the outer wall of the fixing rod (8) is provided with two clamping rings (10); A switching unit (11) is provided on one side of the clamp body (3), and the switching unit (11) is used to drive the clamp ring 1 (9) and the clamp ring 2 (10) to open and close, so that the clamp ring 1 (9) and the clamp ring 2 (10) intermittently clamp the outer wall of the cable, thereby preventing the clamp ring 1 (9) from contacting the outer wall of the cable for a long time and dissipating heat from the cable surface; A protection unit (12) is provided inside the clamping ring 2 (10) to provide flame retardancy to the cable surface when smoke appears in the cable box (1).

2. The retractable cable tray according to claim 1, characterized in that: The switching unit (11) comprises a moving rod (13) located between the clamping ring 1 (9) and the clamping ring 2 (10), the moving rod (13) comprising a conical portion (14) and a sliding portion (15), a sliding rod (16) being provided at the bottom end of the sliding portion (15), the sliding rod (16) passing through the clamping body (3) and being slidably connected thereto, a ring body (17) being provided above the sliding rod (16), an intermittent gear (18) being provided inside the ring body (17), the inner wall of the ring body (17) comprising two rows of tooth blocks (19) meshing with the intermittent gear (18), a connecting shaft (20) being provided inside the intermittent gear (18), an outer wall of the connecting shaft (20) being provided with a bevel gear 1 (21), a bevel gear 2 (22) meshing therewith being provided on one side of the bevel gear 1 (21), and a micro-electric The micro motor (23) is provided with a rotating shaft of the micro motor (23) located on the inner wall of the bevel gear (22) and fixedly connected thereto; a temperature sensor (24) is provided on one side of the clamp (3); the temperature sensor (24) is electrically connected to the micro motor (23); a fan blade (25) is provided on the outer wall of the connecting shaft (20); a cover (26) is provided on the outside of the fan blade (25); the cover (26) includes an air inlet (27) and an air outlet (28); an air pipe (29) is provided at the end of the air outlet (28); the air pipe (29) passes through the clamp (3); and a box (30) is provided at one end of the air pipe (29); two through holes (31) are provided above the box (30); a connecting rod (32) is also provided above the box (30); the connecting rod (32) is located on the outer wall of the sliding portion (15) and slides relative to the sliding portion (15).

3. The retractable cable tray according to claim 2, characterized in that: The protection unit (12) comprises a cooling box (33) located inside a box body (30), a condensing agent (34) being loaded inside the cooling box (33), a baffle (35) being provided inside the cooling box (33), an upper end of the baffle (35) being fixedly connected to an inner wall of the box body (30), a bottom end of the baffle (35) being located inside the box body (30) and shielding a square hole of the box body (30), an electromagnet (36) being provided inside the box body (30), a smoke sensor (37) being provided on one side of the clamp (3), the smoke sensor (37) being connected to the electromagnet (3 6) electrically connected, the electromagnet (36) having a magnetic force of mutual attraction with the outer wall of the box body (30) when the power is on, the outer wall of the box body (30) is provided with an air pipe (38), the end of the air pipe (38) is provided with a U-shaped tube (39), the interior of the clamping ring (10) is a cavity, the two upper ends of the U-shaped tube (39) are respectively located at the bottom of the two clamping rings (10) and are connected to each other, the interior of the clamping ring (10) is provided with an arc cover (40), and the interiors of the arc cover (40) and the clamping ring (10) are both provided with a plurality of circular holes (41).

4. The retractable cable tray according to claim 3, characterized in that: When the interior of the second clamping ring (10) is filled with gas, the central axes of the arc-shaped cover (40) and the circular hole (41) inside the second clamping ring (10) are aligned with each other.

5. The retractable cable tray according to claim 2, characterized in that: The end of the sliding rod (16) is provided with a special-shaped rod (42), the upper end of the special-shaped rod (42) is provided with a shielding plate (43), the outer wall of the wire box (1) has a through slot (44), and the shielding plate (43) shields the through slot (44).

6. The retractable cable tray according to claim 5, characterized in that: The gas flowing through the through groove (44) is located on the same straight line as the direction of the cable in the cable box (1).

7. The retractable cable tray according to claim 1, characterized in that: A plurality of equally spaced magnetic sheets (45) are provided inside the slot body (4); the magnetic sheets (45) and two ends of the clamp body (3) have a magnetic force that attracts each other; and the clamp body (3) slides freely inside the slot body (4).

8. The retractable cable tray according to claim 1, characterized in that: There is a magnetic force of mutual attraction between the two clamping rings (9), and there is a magnetic force of mutual attraction between the two clamping rings (10).

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