阅读说明：本技术 一种电缆沟智能盖板 (Cable pit intelligence apron ) 是由 张海峰 于 2021-07-13 设计创作，主要内容包括：本发明公开了一种电缆沟智能盖板,包括水泥地,所述水泥地内设有开口向上的电缆沟,所述电缆沟内设有防水机构,所述防水机构包括滑动连接在所述电缆沟内壁上的盖板,本发明在雨天时对雨水进行接取,利用雨水的重力带动支撑板下降,然后利用螺纹传动原理和凸轮结构带动防水机构利用双重阻挡防护将通风口堵住,双重保护措施能够有效的防止雨水进入电缆沟,防止雨水造成电缆短路,保护电路安全,降低经济损失,不仅如此,本发明还具备防盗功能,利用巧妙的机械结构将盖板固定在电缆沟上侧开口处,只能利用特殊齿形的钥匙插入带动伸缩杆伸长后,才能移除固定块,从而将盖板取出,防止盖板被盗,降低经济损失。(The invention discloses an intelligent cover plate of a cable trench, which comprises a cement ground, wherein the cement ground is internally provided with a cable trench with an upward opening, the cable trench is internally provided with a waterproof mechanism, the waterproof mechanism comprises a cover plate which is connected to the inner wall of the cable trench in a sliding way, the intelligent cover plate can be used for receiving rainwater in rainy days, a support plate is driven to descend by using the gravity of the rainwater, then a vent is blocked by using a thread transmission principle and a cam structure to drive the waterproof mechanism to use double-blocking protection, double-protection measures can effectively prevent the rainwater from entering the cable trench, prevent the rainwater from causing cable short circuit, protect the safety of a circuit and reduce the economic loss, the intelligent cover plate also has an anti-theft function, the cover plate is fixed at the opening at the upper side of the cable trench by using a smart mechanical structure, and a fixed block can be removed only after a special-tooth-shaped key is inserted into the telescopic rod to drive the telescopic rod to extend, thereby take out the apron, prevent that the apron is stolen, reduce economic loss.)

1. The utility model provides a cable pit intelligence apron, includes cement ground, be equipped with the ascending cable pit of opening in the cement ground, its characterized in that: the cable trench is internally provided with a waterproof mechanism, the waterproof mechanism comprises a cover plate which is connected on the inner wall of the cable trench in a sliding manner, a transmission cavity is arranged in the cover plate, the inner wall of the transmission cavity is connected with a transmission shaft in a rotating manner, the transmission shaft is provided with a cylinder, the cylinder is provided with a spiral chute, the upper side of the cover plate is fixedly connected with a supporting spring which is symmetrical left and right relative to the transmission shaft, the supporting spring is fixedly connected with a water receiving plate, the water receiving plate is internally provided with a water receiving groove with an upward opening, the lower side of the water receiving plate is provided with a supporting rod which extends into the transmission cavity and is connected with the cover plate in a sliding manner, the lower side of the supporting rod is fixedly connected with a sliding pin which is positioned in the spiral chute and is connected with the cylinder in a sliding manner, the lower side of the cylinder is fixedly connected with an elliptical disk, the cover plate is provided with ventilation openings which are symmetrical left and right relative to the transmission shaft, and the sliding plate is connected in the transmission cavity in a sliding manner relative to the elliptical disk, the anti-theft mechanism comprises a fixed cavity, a connecting rod, a blocking block and an anti-theft mechanism, wherein the fixed cavity is arranged in the cover plate and is positioned in the direction of the vent hole, and the direction of the transmission shaft is far away from the fixed cavity.

2. The cable trench intelligent cover according to claim 1, wherein: waterproofing mechanism is still including setting up just be located under the transmission shaft the disc of apron downside, be equipped with on the disc downside terminal surface about the pivot of transmission shaft centrosymmetry, rotate in the pivot and be connected about the bull stick of transmission shaft centrosymmetry, sliding connection is about on the apron downside terminal surface the sliding block of transmission shaft bilateral symmetry, the sliding block with the bull stick rotates to be connected.

3. The cable trench intelligent cover according to claim 2, wherein: waterproof mechanism still includes fixed connection and is in the sliding block is kept away from the waterproof board of transmission shaft one side.

4. The cable trench intelligent cover of claim 3, wherein: waterproof mechanism still includes fixed connection at the rotor plate of transmission shaft downside, cement is equipped with on the ground about rotor plate bilateral symmetry's delivery port, the rotor plate downside be equipped with about transmission shaft bilateral symmetry's cushion chamber, the symmetry keep away from in the cushion chamber transmission shaft one side sliding connection has the hang plate, the hang plate is located delivery port downside and with cable pit inner wall butt, the hang plate is close to transmission shaft one side is equipped with fixed connection and is in buffer spring on the rotor plate.

5. The cable trench intelligent cover according to claim 4, wherein: the anti-theft mechanism further comprises a reset spring arranged on the inner wall of the fixed cavity and close to one side of the transmission shaft, a sliding rod is fixedly connected to one side, far away from the transmission shaft, of the reset spring, a fixed groove is formed in the cement floor and located in the direction, far away from the transmission shaft, of the fixed cavity, and a fixed block which is located in the fixed groove and is in sliding connection with the cement floor is fixedly connected to one side, far away from the transmission shaft, of the sliding rod.

6. The cable trench intelligent cover according to claim 5, wherein: the anti-theft mechanism is still including setting up the first swash plate of slide bar upside, sliding connection has the extension board of longitudinal symmetry on the apron, be equipped with flexible chamber in the extension board, the symmetry flexible intracavity threaded connection has and is located the symmetry rotary rod between the extension board, extension board downside fixedly connected with is located the second swash plate of first swash plate upside.

7. The cable trench intelligent cover according to claim 6, wherein: the anti-theft mechanism is characterized by further comprising a protection plate arranged on the upper side of the extension plate, an opening hole communicated with the telescopic cavity is formed in the protection plate, and a matching hole located on the lower side of the opening hole is formed in the rotary rod.

Technical Field

The invention relates to the technical field of cable protection, in particular to an intelligent cover plate of a cable trench.

Background

The cable trench is an underground pipeline for laying and replacing electric power or telecommunication cable facilities, is also an enclosure structure of laid cable facilities, and has pipeline structure forms of rectangle, circle, arch and the like. With the rapid development of economy and urban infrastructure in China, the demand for various new building materials is increasingly strengthened. The investment of the country on public facilities is extremely large, the urban reconstruction and the new construction of electric wires, cables and optical cables are changed into the open air and the underground, so the demand on the composite cable trench cover plate is increased, and the cable trench cover plate is in the open air environment, so that the cable trench cover plate is not only attacked by rainwater, but also stolen by thieves.

Disclosure of Invention

The invention aims to provide an intelligent cover plate of a cable duct, which is used for overcoming the defects in the prior art.

The intelligent cable trench cover plate comprises a cement ground, wherein a cable trench with an upward opening is arranged in the cement ground, a waterproof mechanism is arranged in the cable trench, the waterproof mechanism comprises a cover plate which is connected to the inner wall of the cable trench in a sliding manner, a transmission cavity is arranged in the cover plate, a transmission shaft is connected to the inner wall of the transmission cavity in a rotating manner, a cylinder is arranged on the transmission shaft, a spiral chute is arranged on the cylinder, a support spring which is bilaterally symmetrical relative to the transmission shaft is fixedly connected to the upper side of the cover plate, a water receiving plate is fixedly connected to the support spring, a water receiving groove with an upward opening is arranged in the water receiving plate, a support rod which extends into the transmission cavity and is connected with the cover plate in a sliding manner is arranged on the lower side of the water receiving plate, and a sliding pin which is positioned in the spiral chute and is connected with the cylinder in a sliding manner is fixedly connected below the support rod, the lower side of the cylinder is fixedly connected with an elliptical disc, the cover plate is provided with ventilation openings which are bilaterally symmetrical relative to the transmission shaft, the transmission cavity is connected with sliding plates which are bilaterally symmetrical relative to the elliptical disc in a sliding manner, the sliding plates are connected with the elliptical disc in a sliding manner, one sides of the symmetrical sliding plates, far away from the transmission shaft, are provided with connecting springs which are fixedly connected on the inner wall of the transmission cavity, one sides of the sliding plates, far away from the transmission shaft, are provided with connecting rods which are connected with the cover plate in a sliding manner, one sides of the connecting rods, near the ventilation openings, are provided with blocking blocks, when the water receiving plate is filled with rainwater, the water receiving plate descends due to the gravity action of the rainwater, the supporting springs are compressed, so that the supporting rods are driven to move downwards, the sliding pins are driven to move downwards, and the cylinder is driven to rotate due to the screw thread transmission principle, thereby drive the transmission shaft rotates, promptly the oval dish rotates, because cam drive principle, can drive the symmetry the sliding plate is to keeping away from the transmission shaft direction slides, the coupling spring compression, the connecting rod drives block the piece and move to in the vent, thereby utilize block the piece will the vent is plugged up, prevents that the rainwater from flowing into the cable pit, still be equipped with anti-theft mechanism in the cable pit, anti-theft mechanism is including setting up just be located in the apron the vent is kept away from the fixed chamber of transmission shaft direction, through anti-theft mechanism can prevent that the well lid is stolen.

Further technical scheme, waterproofing mechanism is still including setting up just be located under the transmission shaft the disc of apron downside, be equipped with on the disc downside terminal surface about transmission shaft centrosymmetric's pivot, the swivelling joint is relevant in the pivot the bull stick of transmission shaft centrosymmetric, sliding connection is relevant on the apron downside terminal surface about transmission shaft bilateral symmetry's sliding block, the sliding block with the bull stick swivelling joint.

A further technical scheme, waterproofing mechanism still includes fixed connection and is in the sliding block is kept away from the waterproof board of transmission shaft one side, works as when the transmission shaft rotates, can drive the disc rotates, thereby drives the pivot with the transmission shaft rotates as the center, because connecting rod transmission principle, can drive the symmetry the sliding block is simultaneously to keeping away from the transmission shaft direction removes, thereby drives the symmetry the waterproof board moves to the vent downside, thereby utilizes the waterproof board will vent downside opening is plugged up.

In a further technical scheme, the waterproof mechanism further comprises a rotating plate fixedly connected to the lower side of a transmission shaft, water outlets which are bilaterally symmetrical with respect to the rotating plate are arranged on the cement floor, buffer cavities which are bilaterally symmetrical with respect to the transmission shaft are arranged on the lower side of the rotating plate, an inclined plate is connected to one side, far away from the transmission shaft, of the buffer cavities in symmetry in a sliding manner, is positioned on the lower side of the water outlets and is abutted against the inner wall of the cable trench, a buffer spring which is fixedly connected to the rotating plate is arranged on one side, close to the transmission shaft, of the inclined plate, rainwater falls onto the inclined plate through the ventilation opening, and can be driven to rotate when the transmission shaft rotates due to the inclined surface of the inclined plate sliding into the water outlets and flowing to the outside, the inclined plate slides into the buffer cavity, the buffer spring is compressed, and the inclined plate can reset after the rain stops.

According to a further technical scheme, the anti-theft mechanism further comprises a reset spring which is arranged on the inner wall of the fixed cavity and close to one side of the transmission shaft, a sliding rod is fixedly connected to one side, far away from the transmission shaft, of the reset spring, a fixed groove is formed in the cement floor and located in the fixed cavity and far away from the direction of the transmission shaft, a fixed block which is located in the fixed groove and is in sliding connection with the cement floor is fixedly connected to one side, far away from the transmission shaft, of the sliding rod, and the cover plate can be clamped at an opening on the upper side of the cable trench through the fixed block.

A further technical scheme, the anti-theft mechanism still includes setting up the first swash plate of slide bar upside, sliding connection has the extension board of longitudinal symmetry on the apron, be equipped with flexible chamber in the extension board, the symmetry flexible intracavity threaded connection have be located the symmetry the rotary rod between the extension board, extension board downside fixedly connected with is located the second swash plate of first swash plate upside, when the rotary rod rotates, through the screw drive principle, can drive longitudinal symmetry the extension board slides to keeping away from the rotary rod direction simultaneously, promptly by the symmetry the extension board with the stock length of rotary rod constitution lengthens, when pushing to the downside the extension board, can drive the second swash plate lapse utilizes the effect of second swash plate with first swash plate upper inclined plane to drive first swash plate is to being close to the transmission shaft direction removes, thereby drive the slide bar slides thereupon, the fixed block moves outside the fixed slot, the apron loses promptly and blocks, can take out the apron.

Further technical scheme, anti-theft mechanism is still including setting up the guard plate of extension board upside, be equipped with in the guard plate with the hole of opening that flexible chamber link up, be equipped with on the rotary rod and be located open the hole downside and join in marriage the hole, pass through the key open the hole and insert pair downthehole, wrench movement key can drive the rotary rod rotates.

The invention has the beneficial effects that: the invention takes rainwater in rainy days, utilizes the gravity of the rainwater to drive the supporting plate to descend, then utilizes the screw thread transmission principle and the cam structure to drive the waterproof mechanism to utilize double-blocking protection to block the vent, the double-protection measure can effectively prevent the rainwater from entering the cable trench, the rainwater can be prevented from causing the short circuit of the cable, the circuit is protected to be safe, and the economic loss is reduced.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic view of the overall structure of an intelligent cover plate of a cable trench according to the present invention;

FIG. 3 is a schematic view of A-A of FIG. 2 in accordance with the present invention;

FIG. 4 is a schematic view of B-B of FIG. 2 according to the present invention;

FIG. 5 is a schematic view of C-C of FIG. 2 in accordance with the present invention;

fig. 6 is an enlarged partial schematic view of D of fig. 2 of the present invention.

Detailed Description

For purposes of making the objects and advantages of the present invention more apparent, the following detailed description of the invention, taken in conjunction with the examples, should be understood that the following text is only intended to describe one or more specific embodiments of the invention, and not to strictly limit the scope of the invention as specifically claimed, and that the terms up, down, left and right, as used herein, are not limited to their strict geometric definitions, but rather include tolerances for reasonable and inconsistent machining or human error, the following detailed description of which is intended to be exhaustive:

referring to the attached drawings, the intelligent cable trench cover plate according to the embodiment of the invention comprises a cement ground 11, a cable trench 12 with an upward opening is arranged in the cement ground 11, a waterproof mechanism 901 is arranged in the cable trench 12, the waterproof mechanism 901 comprises a cover plate 13 connected to the inner wall of the cable trench 12 in a sliding manner, a transmission cavity 14 is arranged in the cover plate 13, a transmission shaft 17 is rotatably connected to the inner wall of the transmission cavity 14, a cylinder 18 is arranged on the transmission shaft 17, a spiral chute 19 is arranged on the cylinder 18, support springs 22 which are bilaterally symmetrical with respect to the transmission shaft 17 are fixedly connected to the upper side of the cover plate 13, a water receiving plate 15 is fixedly connected to the support springs 22, a water receiving groove 16 with an upward opening is arranged in the water receiving plate 15, a support rod 21 which extends into the transmission cavity 14 and is connected to the cover plate 13 in a sliding manner is arranged on the lower side of the water receiving plate 15, a sliding pin 20 which is positioned in the spiral chute 19 and is slidably connected with the cylinder 18 is fixedly connected below the supporting rod 21, an elliptical disc 23 is fixedly connected to the lower side of the cylinder 18, ventilation openings 28 which are bilaterally symmetrical with respect to the transmission shaft 17 are arranged on the cover plate 13, sliding plates 24 which are bilaterally symmetrical with respect to the elliptical disc 23 are slidably connected in the transmission chamber 14, the sliding plates 24 are slidably connected with the elliptical disc 23, a connecting spring 26 which is fixedly connected to the inner wall of the transmission chamber 14 is arranged on one side, away from the transmission shaft 17, of the symmetrical sliding plates 24, a connecting rod 25 which is slidably connected with the cover plate 13 is arranged on one side, away from the transmission shaft 17, of the connecting rod 25, a blocking block 27 is arranged on one side, close to the ventilation openings 28, of the connecting rod 25, when the water receiving plate 15 is filled with rainwater, the water receiving plate 15 descends due to the gravity effect of the rainwater, the support spring 22 is compressed, thereby moving the support rod 21 downward, thereby moving the slide pin 20 downward, due to the screw drive principle, the cylinder 18 is driven to rotate, and the transmission shaft 17 is driven to rotate, namely, the oval plate 23 rotates, and the symmetrical sliding plates 24 can be driven to slide in the direction away from the transmission shaft 17 due to the cam transmission principle, the connecting spring 26 is compressed, the connecting rod 25 drives the stop block 27 to move into the ventilation opening 28, so that the ventilation opening 28 is blocked by the stopper 27, preventing rainwater from flowing into the cable trench, still be equipped with anti-theft mechanism 902 in the cable pit 12, anti-theft mechanism 902 is including setting up in the apron 13 and being located vent 28 is kept away from the fixed chamber 29 of transmission shaft 17 direction, through anti-theft mechanism 902 can prevent that the well lid is stolen.

Advantageously or exemplarily, the waterproof mechanism 901 further includes a disk 43 disposed below the transmission shaft 17 and located on the lower side of the cover plate 13, a rotation shaft 44 that is centrosymmetric with respect to the transmission shaft 17 is disposed on the lower side end surface of the disk 43, a rotation rod 45 that is centrosymmetric with respect to the transmission shaft 17 is rotatably connected to the rotation shaft 44, a sliding block 46 that is bilaterally symmetric with respect to the transmission shaft 17 is slidably connected to the lower side end surface of the cover plate 13, and the sliding block 46 and the rotation rod 45 are rotatably connected.

Advantageously or exemplarily, the waterproof mechanism 901 further includes a waterproof plate 47 fixedly connected to a side of the sliding block 46 away from the transmission shaft 17, and when the transmission shaft 17 rotates, the disc 43 is driven to rotate, so as to drive the rotation shaft 44 to rotate around the transmission shaft 17, and due to the principle of link transmission, the symmetrical sliding blocks 46 can be driven to move simultaneously in a direction away from the transmission shaft 17, so as to drive the symmetrical waterproof plate 47 to move to the lower side of the ventilation opening 28, so that the opening on the lower side of the ventilation opening 28 is blocked by the waterproof plate 47.

Beneficially or exemplarily, the 903 further comprises a rotating plate 48 fixedly connected to the lower side of the transmission shaft 17, the cement floor 11 is provided with water outlets 50 bilaterally symmetrical with respect to the rotating plate 48, the lower side of the rotating plate 48 is provided with buffer cavities 51 bilaterally symmetrical with respect to the transmission shaft 17, a tilting plate 49 is slidably connected to the side, far away from the transmission shaft 17, of the symmetrical buffer cavities 51, the tilting plate 49 is located at the lower side of the water outlets 50 and abuts against the inner wall of the cable trench 12, a buffer spring 52 fixedly connected to the rotating plate 48 is arranged at the side, near the transmission shaft 17, of the tilting plate 49, rainwater falls onto the tilting plate 49 through the ventilation opening 28, slides into the water outlets 50 due to the inclined surface of the tilting plate 49 and flows to the outside, when the transmission shaft 17 rotates, the rotating plate 48 is driven to rotate, and the tilting plate 49 rotates therewith, because the inclined plate 49 and the inner wall of the cable trench 12 are abutted, the inclined plate 49 slides into the buffer cavity 51, and the buffer spring 52 is compressed and can reset after the rain stops.

Advantageously or exemplarily, the anti-theft mechanism 902 further includes a return spring 32 disposed on an inner wall of the fixing cavity 29 on a side close to the transmission shaft 17, a sliding rod 30 is fixedly connected to a side of the return spring 32 away from the transmission shaft 17, a fixing groove 42 is disposed on the cement ground 11 in a direction of the fixing cavity 29 away from the transmission shaft 17, a fixing block 31 disposed in the fixing groove 42 and slidably connected to the cement ground 11 is fixedly connected to a side of the sliding rod 30 away from the transmission shaft 17, and the cover plate 13 can be clamped at the opening on the upper side of the cable trench 12 through the fixing block 31.

Advantageously or exemplarily, the anti-theft mechanism 902 further includes a first inclined plate 33 disposed on the upper side of the sliding rod 30, the cover plate 13 is slidably connected with vertically symmetrical extension plates 35, a telescopic cavity 36 is disposed in the extension plate 35, the symmetrical telescopic cavity 36 is internally threaded with a rotating rod 39 disposed between the symmetrical extension plates 35, the lower side of the extension plate 35 is fixedly connected with a second inclined plate 34 disposed on the upper side of the first inclined plate 33, when the rotating rod 39 rotates, the vertically symmetrical extension plates 35 can be driven to simultaneously slide away from the rotating rod 39 through a screw transmission principle, that is, the length of the long rod composed of the symmetrical extension plates 35 and the rotating rod 39 is increased, when the extension plate 35 is pushed to the lower side, the second inclined plate 34 can be driven to slide downward, by the action of the inclined surfaces on the second inclined plate 34 and the first inclined plate 33, thereby driving the first inclined plate 33 to move towards the direction close to the transmission shaft 17, and driving the sliding rod 30 to slide therewith, the fixing block 31 moves out of the fixing groove 42, and the cover plate 13 is not blocked, and the cover plate 13 can be taken out.

Advantageously or exemplarily, the anti-theft mechanism 902 further includes a protection plate 37 disposed on the upper side of the extension plate 35, an opening hole 38 communicating with the telescopic cavity 36 is disposed in the protection plate 37, a matching hole 40 disposed on the lower side of the opening hole 38 is disposed on the rotating rod 39, and a key is inserted into the matching hole 40 through the opening hole 38, and the rotating rod 39 is rotated by twisting the key.

The invention relates to an intelligent cover plate of a cable duct, which comprises the following working procedures:

when raining, rainwater falls into the water receiving tank 16, another part of rainwater falls onto the inclined plate 49 through the ventilation opening 28, slides into the water outlet 50 due to the inclined surface of the inclined plate 49 and flows to the outside, when the water receiving plate 15 is full of rainwater, the water receiving plate 15 descends due to the gravity of rainwater, the support spring 22 is compressed, so as to drive the support rod 21 to move downwards, so as to drive the sliding pin 20 to move downwards, and due to the screw transmission principle, the cylinder 18 is driven to rotate, so as to drive the transmission shaft 17 to rotate, i.e. the elliptical disc 23 rotates, due to the cam transmission principle, the symmetrical sliding plate 24 can be driven to slide in the direction away from the transmission shaft 17, the connection spring 26 is compressed, the connection rod 25 drives the blocking block 27 to move into the ventilation opening 28, so as to block the ventilation opening 28 by the blocking block 27, the rainwater is prevented from flowing into the cable trench, at the same time, the transmission shaft 17 rotates to drive the disc 43 to rotate, so as to drive the rotating shaft 44 to rotate by taking the transmission shaft 17 as a center, due to the principle of link transmission, the symmetrical sliding blocks 46 can be driven to move towards the direction away from the transmission shaft 17, so as to drive the symmetrical waterproof plates 47 to move to the lower side of the ventilation opening 28, so as to utilize the waterproof plates 47 to block the lower side opening of the ventilation opening 28, at the same time, after the ventilation opening 28 is blocked, when the transmission shaft 17 rotates, the rotating plate 48 can be driven to rotate, the inclined plate 49 rotates along with the rotation, as the inclined plate 49 is abutted against the inner wall of the cable trench 12, the inclined plate 49 slides into the buffer cavity 51, the buffer spring 52 is compressed, and after the rainwater stops, the rainwater in the water receiving groove 16 evaporates, each part can be reset;

because reset spring 32's effect, can be through fixed block 31 can with apron 13 card is in the opening part of cable pit 12 upside, when the well lid is taken out to needs, pass through the key open the hole 38 and insert in the matching hole 40, twist the key, can drive rotary rod 39 rotates, through the screw thread transmission principle, can drive longitudinal symmetry the extension board 35 is simultaneously to keeping away from rotary rod 39 direction is slided, promptly by the symmetry the extension board 35 with the stock length that rotary rod 39 is constituteed is elongated, when pushing to the downside during extension board 35, can drive second swash plate 34 lapse utilizes second swash plate 34 with the effect on inclined plane on first swash plate 33 to drive first swash plate 33 is to being close to the removal of transmission shaft 17 direction, thereby drive slide bar 30 slides along with it, fixed block 31 moves outside fixed slot 42, the cover plate 13 is not blocked, and the cover plate 13 can be taken out, and only a special key can be inserted into the matching hole 40 due to the particularity of the key tooth profile, so that the theft can be prevented.

The invention has the beneficial effects that: the invention takes rainwater in rainy days, utilizes the gravity of the rainwater to drive the supporting plate to descend, then utilizes the screw thread transmission principle and the cam structure to drive the waterproof mechanism to utilize double-blocking protection to block the vent, the double-protection measure can effectively prevent the rainwater from entering the cable trench, the rainwater can be prevented from causing the short circuit of the cable, the circuit is protected to be safe, and the economic loss is reduced.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.