CN118609898A - A B1 flame-retardant control cable with UV protection and rat and ant resistance for rail transit - Google Patents

Abstract

The present application discloses a B1-level flame-retardant control cable for rail transit, which includes an outer sheath, an armor layer, an inner sheath, a shielding layer and a sheath from outside to inside, and the sheath has multiple cable cores, and the cable core includes an insulating layer, a fire-resistant flame-retardant layer and a conductor from outside to inside. It also includes an enveloping layer, four pipe units, four anti-bite units, two wrapping units and a sheath wrapping the two wrapping units. The cable of the present application has good flame retardant, insulation and shielding properties, and has good anti-aging properties and good mechanical properties, so it has a long service life. The anti-bite unit has a good anti-rat and ant effect, and the rat repellent can play a role in repelling rats and ants, thereby reducing the damage caused by rats and ants to the cable. In addition, the cable has a structure that is not easy to damage the inside of the enveloping layer. Once the outer sheath is damaged, it can be detected in time, and active rat repellent can be achieved after damage, and the damaged part is relatively convenient to repair.

Description

A B1 flame-retardant control cable with UV protection and rat and ant resistance for rail transit

Technical Field

The present invention relates to the technical field of cables, and more specifically to a B1-level flame-retardant control cable for rail transit with UV protection, rat and ant protection.

Background Art

Control cable is an important cable used to connect control equipment and controlled equipment. It mainly transmits signals or a mixture of signals and power. The core function of control cable is to transmit control signals. In the automatic control system, it is responsible for transmitting the signals detected by the sensor to the controller, and also transmits the controller's instructions to the actuator to realize automatic control of the system.

Existing control cables may have deficiencies in flame retardant properties. Once a fire occurs in the cable, the fire is easy to spread, which may not only cause the cable itself to burn, but also pose a serious fire threat to surrounding buildings and equipment, resulting in huge economic losses and casualties. During the laying, installation and operation of the cable, it may be subjected to various mechanical forces, such as stretching, compression, bending, etc. If the mechanical properties of the cable are insufficient, it is easy to cause the cable to be damaged or broken. Especially in complex environments such as rail transit, the cable needs to withstand more mechanical forces. In addition, in environments such as rail transit, the cable will be affected by environmental and temperature factors during long-term use, resulting in aging of the cable material and degradation of performance. In addition, animals such as rats and ants often move around the cable and even bite the cable, which can easily cause the cable to be damaged. After the cable is damaged, it is often difficult to be discovered and repaired in time. Rats and ants will more easily gnaw the internal structure of the cable from the damaged part, or even directly bite off the cable conductor, affecting the normal operation of the system.

Summary of the invention

The present invention aims to overcome the defects of the prior art and provide a B1 flame retardant control cable for rail transit with UV protection, rat and ant protection.

In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a control cable, comprising an outer protective layer, an armor layer, an inner protective layer, a shielding layer and a wrapping layer from the outside to the inside, wherein the wrapping layer has a plurality of cable cores, and the cable core comprises an insulating layer, a fire-resistant and flame-retardant layer and a conductor from the outside to the inside.

Furthermore, the armor layer is a steel belt armor layer, and the shielding layer is a copper wire braided shielding layer.

Furthermore, the insulating layer is a polyethylene insulating layer, and the fire-resistant flame-retardant layer is a low-smoke halogen-free flame-retardant layer.

Furthermore, the wrapping layer is a mica wrapping tape layer.

Furthermore, the outer protective layer is a cross-linked polyethylene outer protective layer.

Furthermore, the inner protective layer is a polyethylene inner protective layer.

Furthermore, it includes an enveloping layer, four pipe units, four anti-bite units, two wrapping units and a sheath wrapping the two wrapping units; the outer wall of the enveloping layer has four first accommodating grooves and four second accommodating grooves, the four first accommodating grooves are distributed in a circular shape with equal spacing, the four second accommodating grooves are distributed in a circular shape with equal spacing, the four first accommodating grooves and the four second accommodating grooves are distributed alternately, and convex ridges extending along the length direction of the cable core are formed between adjacent first accommodating grooves and second accommodating grooves; the wrapping unit includes a connecting belt and a plurality of wrapping sleeves bonded and fixed to the connecting belt and distributed along the length direction of the connecting belt, the cross-section of the wrapping sleeve is semicircular, the inner side of the wrapping sleeve has a first groove portion and two second groove portions, the first groove portion has a connecting belt groove for accommodating the connecting belt, and the wrapping The two second grooves of the sleeve are respectively located at the two side edges of the wrapping sleeve, a tube accommodating space can be formed between the first groove and the first accommodating groove facing the groove, and a tube accommodating space can be formed between the two second grooves close to each other and the first accommodating groove facing the two second grooves; the pipeline unit includes a ventilation pipe located in the tube accommodating space and two side wings fixedly connected to the ventilation pipe, the ventilation pipe has two air outlet holes, and the side wings are located between the wrapping sleeve and the convex ridge; each anti-bite unit is accommodated in one of the second accommodating grooves, the anti-bite unit includes a connecting piece extending along the cable core direction and a plurality of rat repellent bags distributed along the length direction of the connecting piece and bonded and fixed to the connecting piece, the rat repellent bag includes a strip bag with air holes and a rat repellent located in the strip bag.

Thus, the connecting belt enables a plurality of wrapping sleeves to be arranged in a row for easy installation; the connecting piece enables a plurality of mouse repellent bags to be arranged in a row for easy installation.

Further, two of the four tube accommodating spaces are composed of one first groove portion and one first accommodating groove, and the other two are composed of one second accommodating groove and two second groove portions.

Furthermore, two rows of air outlet holes of the ventilation duct are located on both sides of the ventilation duct and are respectively close to a side wing portion.

Furthermore, there is a gap between the convex ridge and the wrapping sleeve.

The side wing portion thus limits the installation angle of the duct unit, so that the subsequent air outlet direction of the air outlet hole of the ventilation duct can be better aligned with the gap between the ridge and the wrapping sleeve.

Furthermore, the strip bag is a mesh bag; the connecting belt and the connecting piece are both made of PVC material; and the pipeline unit is made of PVC material.

Furthermore, the sheath is a cross-linked polyethylene sheath.

Furthermore, the rodent repellent is in powder or granular form.

Furthermore, the rodent repellent contains capsaicin.

Thereby the effect of driving away rats and ants is better.

Further, it includes a first end unit and a second end unit, the first end unit includes a circular ring chamber, a protruding chamber fixedly connected to and communicated with the circular ring chamber, a first outer ring surrounding plate connected to the circular ring chamber, a first inner ring surrounding plate connected to the circular ring chamber, an air inlet pipe communicated with the protruding chamber and four insert tubes communicated with the circular ring chamber, each insert tube is inserted into a ventilation pipe; the first outer ring surrounding plate surrounds the sheath with a sealant therebetween, the first inner ring surrounding plate surrounds the outer protective layer with a sealant therebetween; the second end unit includes an annular end plate, a second outer annular surrounding plate fixedly connected to the annular end plate, a second inner annular surrounding plate fixedly connected to the annular end plate and four plugging rods fixedly connected to the annular end plate, each plugging rod is inserted into a ventilation pipe, the second outer annular surrounding plate surrounds the sheath with a sealant therebetween, the second inner annular surrounding plate surrounds the outer protective layer with a sealant therebetween.

Furthermore, there is sealant between the insert tube and the ventilation tube.

Before the cannula is inserted into the ventilation tube, sealant is coated on the surface of the cannula, thereby achieving a sealed connection between the cannula and the ventilation tube.

Furthermore, there is sealant between the blocking rod and the ventilation pipe.

Before the plugging rod is inserted into the ventilation pipe, a sealant is coated on the surface of the plugging rod, so that the plugging rod and the ventilation pipe are sealed and connected.

Furthermore, the air inlet pipe is provided with an air inlet pipe joint.

This makes it easy to connect a fan or an air filling unit.

Furthermore, the air inlet pipe is provided with a manual valve.

Thereby, the air inlet duct is conveniently closed.

Furthermore, the inner side of the first outer annular surrounding plate, the inner side of the first inner annular surrounding plate, the inner side of the second outer annular surrounding plate and the inner side of the second inner annular surrounding plate all have a plurality of semi-cylindrical convex ribs.

Thus, the semi-cylindrical rib enables the sealant to better achieve a sealed connection between the components.

The present application also provides a preparation method based on the above control cable, comprising the following steps:

1) preparing the cable core, the pipe unit, the anti-bite unit, the wrapping unit, the first end unit and the second end unit; the anti-bite unit is prepared by preparing a connecting piece and a plurality of rat repellent bags, and the plurality of rat repellent bags are arranged in a row and bonded to the connecting piece; the wrapping unit is prepared by preparing a connecting belt and a plurality of wrapping sleeves, and the plurality of wrapping sleeves are arranged in a row and bonded to the connecting belt;

2) wrapping multiple cable cores to prepare a wrapping layer, preparing a shielding layer outside the wrapping layer, preparing an inner protective layer outside the shielding layer, preparing an armor layer outside the inner protective layer, preparing an outer protective layer outside the armor layer, and extruding a surrounding layer outside the outer protective layer;

3) Install four anti-bite units and four pipe units and wrap them with two wrapping units, and then extrude the sheath;

4) Install the first end unit and the second end unit at both ends of the cable respectively.

The present application also discloses a maintenance method based on the above control cable, comprising the following steps:

1) Use an air charging unit capable of detecting air pressure to inflate the air inlet pipe. After the set time of inflation, if the air pressure is greater than or equal to the set threshold, the maintenance is completed; if the air pressure is less than the set threshold, proceed to step 2);

2) Connect the air inlet pipe to the fan unit and keep blowing air;

3) Inspect the control cable and find the damaged position of the sheath;

4) Clean the damaged area and fill it with rodent repellent;

5) Use wrapping tape to wrap the damaged part;

6) A protective tube is used to surround the control cable, and a sealant is filled between the protective tube and the sheath; the protective tube includes two semi-circular cylindrical tubes, and the two semi-circular cylindrical tubes are fixedly connected by bolts and nuts;

7) Remove the fan unit and the maintenance is completed.

Furthermore, the step 4) is to clean the damaged position and cut a notch in the sheath at the position, take out the old wrapping cover at the position from the notch, replace it with a new wrapping cover, and fill the notch of the sheath with rodent repellent.

In step 4), whether a new wrapping cover needs to be replaced can be determined based on whether the old wrapping cover is damaged.

Furthermore, both sides of the semi-circular cylindrical tube are provided with a plurality of mounting grooves, and the mounting grooves are provided with mounting through holes.

The through holes are thus installed for installing bolts and nuts to fix the two semi-circular cylindrical tubes.

Furthermore, the wrapping tape is a glass fiber wrapping tape or a non-woven fabric wrapping tape; and the protective tube is made of stainless steel material or PVC material.

Beneficial effects:

1. The cable of the present application has good flame retardancy, insulation, and shielding properties, as well as good anti-aging properties and good mechanical properties, thereby having a long service life.

2. The anti-bite unit of the present application has a good anti-rat and ant effect. The rat repellent can play a role in repelling rats and ants, thereby reducing the damage caused by rats and ants to cables.

3. The cable of the present application has a structure that is not easily damaged to the inside of the enveloping layer, and once the outer sheath is damaged, it can be detected in time, and after the damage, it can actively drive away mice, which can prevent further biting, and the damaged part is relatively easy to repair.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of a cable cross section;

FIG1A is an enlarged view of the region of FIG1A ;

Fig. 2 is a three-dimensional schematic diagram of a cable;

FIG2A is an enlarged view of the area of FIG2A ;

FIG3 is a schematic diagram of the separation of cable components;

FIG3A is an enlarged view of the area of FIG3A ;

FIG3B is an enlarged view of the area of FIG3B ;

FIG3C is an enlarged view of the area of FIG3C ;

FIG4 is a schematic diagram of the cable and the first and second end units being separated from each other from a first viewing angle;

FIG5 is a schematic diagram showing the separation of the cable and the first and second end units from a second viewing angle

Fig. 6 is a schematic diagram of the separation of the first and second end units after the cable is installed;

FIG. 7 is a schematic diagram of a protection tube.

DETAILED DESCRIPTION

Figure numerals: 1 outer sheath; 2 armor layer; 3 inner sheath; 4 shielding layer; 5 sheath; 6 cable core; 6.1 insulation layer; 6.2 fire retardant layer; 6.3 conductor; 7 surrounding layer; 7.1 first receiving groove; 7.2 second receiving groove; 7.3 ridge; 8 pipeline unit; 8.1 ventilation pipe; 8.2 side wing; 8.3 air outlet; 9 anti-bite unit; 9.1 connecting piece; 9.2 mouse repellent bag; 10 wrapping unit; 10.1 connecting belt; 10.2 wrapping sleeve; 10.3 first groove; 10.4 second Two groove parts; 11 sheath; 12 first end unit; 12.1 circular ring chamber; 12.2 protruding chamber; 12.3 first outer ring surrounding plate; 12.4 first inner ring surrounding plate; 12.5 air inlet pipe; 12.6 insert pipe; 12.7 semi-cylindrical convex rib; 13 second end unit; 13.1 ring end plate; 13.2 second outer ring surrounding plate; 13.3 second inner ring surrounding plate; 13.4 plugging rod; 14 semi-circular cylindrical tube; 14.1 mounting groove; 14.2 mounting through hole.

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

The present invention provides a B1-level flame-retardant control cable for rail transit with UV protection and rat and ant protection as shown in Figures 1-7, which comprises an outer sheath 1, an armor layer 2, an inner sheath 3, a shielding layer 4 and a wrapping layer 5 from the outside to the inside, wherein the wrapping layer 5 has a plurality of cable cores 6, and the cable core 6 comprises an insulating layer 6.1, a fire-resistant and flame-retardant layer 6.2 and a conductor 6.3 from the outside to the inside. The armor layer 2 is a steel belt armor layer, the shielding layer 4 is a copper wire braided shielding layer, the insulating layer 6.1 is a polyethylene insulating layer, the fire-resistant and flame-retardant layer 6.2 is a low-smoke and halogen-free flame-retardant layer, and the wrapping layer 5 is a mica wrapping tape layer; the outer sheath 1 is a cross-linked polyethylene outer sheath; and the inner sheath 3 is a polyethylene inner sheath. The control cable also includes an enveloping layer 7, four pipe units 8, four anti-bite units 9, two wrapping units 10 and a sheath 11 wrapping the two wrapping units; the outer wall of the enveloping layer 7 has four first accommodating grooves 7.1 and four second accommodating grooves 7.2, the four first accommodating grooves 7.1 are distributed in an annular manner with equal spacing, the four second accommodating grooves 7.2 are distributed in an annular manner with equal spacing, the four first accommodating grooves 7.1 and the four second accommodating grooves 7.2 are distributed alternately, and convex ridges 7.3 extending along the length direction of the cable core are formed between adjacent first accommodating grooves 7.1 and second accommodating grooves 7.2; the wrapping unit 10 includes a connecting belt 10.1 and a plurality of wrapping sleeves 10.2 bonded and fixed to the connecting belt 10.1 and distributed along the length direction of the connecting belt, the cross-section of the wrapping sleeve 10.2 is semicircular, the inner side of the wrapping sleeve 10.2 has a first groove portion 10.3 and two second groove portions 10.4, the first groove portion 10.3 has a connecting groove for accommodating the connecting belt 10.1 The two second groove portions 10.4 of the wrapping sleeve are respectively located at the two side edges of the wrapping sleeve, a tube accommodating space can be formed between the first groove portion 10.3 and the first accommodating groove 7.1 facing the groove portion, and a tube accommodating space can be formed between the two second groove portions 10.4 close to each other and the first accommodating groove 7.1 facing the two second groove portions 10.4; the pipeline unit 8 includes a ventilation pipe 8.1 located in the tube accommodating space and two side wings 8.2 fixedly connected to the ventilation pipe 8.1, the ventilation pipe 8.1 has two exhaust holes 8.3, and the side wings 8.2 are located between the wrapping sleeve 10.2 and the convex ridge 7.3; each anti-bite unit is accommodated in one of the second accommodating grooves 7.2, the anti-bite unit 9 includes a connecting piece 9.1 extending along the cable core direction and a plurality of rat repellent bags 9.2 distributed along the length direction of the connecting piece 9.1 and bonded and fixed to the connecting piece 9.1, the rat repellent bag includes a strip bag with air holes and a rat repellent located in the strip bag. The strip bag is a gauze bag; the connecting belt 10.1 and the connecting piece 9.1 are both made of PVC material; the pipe unit is made of PVC material; the sheath 11 is a cross-linked polyethylene sheath; the rodent repellent contains capsaicin. The control cable also includes a first end unit 12 and a second end unit 13, the first end unit 12 includes a circular annular chamber 12.1, a protruding chamber 12.2 fixedly connected to and communicating with the circular annular chamber, a first outer annular enclosing plate 12.3 connected to the circular annular chamber 12.1, a first inner annular enclosing plate 12.4 connected to the circular annular chamber 12.1, an air inlet pipe 12.5 communicating with the protruding chamber 12.2, and four inserts 12.6 communicating with the circular annular chamber 12.1, each insert 12.6 is inserted into a ventilation pipe 8.1; the first outer annular enclosing plate 12.3 surrounds the sheath 11 and there is a sealant between the two, the first The inner annular surrounding plate 12.4 surrounds the outer sheath 1 with a sealant therebetween; the second end unit 13 comprises an annular end plate 13.1, a second outer annular surrounding plate 13.2 fixedly connected to the annular end plate 13.1, a second inner annular surrounding plate 13.3 fixedly connected to the annular end plate 13.1, and four plugging rods 13.4 fixedly connected to the annular end plate 13.1, each plugging rod 13.4 is inserted into a ventilation pipe 8.1, the second outer annular surrounding plate 13.2 surrounds the sheath 11 with a sealant therebetween, and the second inner annular surrounding plate 13.3 surrounds the outer sheath 1 with a sealant therebetween. The inner side of the first outer annular surrounding plate 12.3, the inner side of the first inner annular surrounding plate 12.4, the inner side of the second outer annular surrounding plate 13.2, and the inner side of the second inner annular surrounding plate 13.3 are all provided with a plurality of semi-cylindrical convex ribs 12.7.

The present application also discloses a method for preparing the above-mentioned B1-level flame-retardant control cable for rail transit, comprising the following steps:

1) preparing the cable core, the pipe unit, the anti-bite unit, the wrapping unit, the first end unit and the second end unit; the anti-bite unit is prepared by preparing a connecting piece and a plurality of rat repellent bags, and the plurality of rat repellent bags are arranged in a row and bonded to the connecting piece; the wrapping unit is prepared by preparing a connecting belt and a plurality of wrapping sleeves, and the plurality of wrapping sleeves are arranged in a row and bonded to the connecting belt;

2) wrapping multiple cable cores to prepare a wrapping layer, preparing a shielding layer outside the wrapping layer, preparing an inner protective layer outside the shielding layer, preparing an armor layer outside the inner protective layer, preparing an outer protective layer outside the armor layer, and extruding a surrounding layer outside the outer protective layer;

3) Install four anti-bite units and four pipe units and wrap them with two wrapping units, and then extrude the sheath;

4) Install the first end unit and the second end unit at both ends of the cable respectively.

The cable of the present application has good shielding, insulation and flame retardant effects, and has an armor layer, a wrapping sleeve, an enveloping layer and a sheath, so it also has good mechanical properties. And because of the enveloping layer, the wrapping unit and the sheath, even if there is a bite in an environment with rats and ants, the structure inside the outer sheath is not easily bitten, thereby protecting the normal operation of the cable core from being affected. And once the sheath is bitten, the rats and ants will come into contact with the rat repellent inside, so that the rats and ants can be driven away, and after forming a memory, the rats and ants will not bite the cable again.

In addition, the present application also discloses a maintenance method for the above-mentioned B1 flame-retardant control cable for rail transit with UV protection and rat and ant protection, comprising the following steps:

1) Use an air-filling unit that can detect air pressure to inflate the air inlet pipe. After the set time of inflation, if the air pressure is greater than or equal to the set threshold, the maintenance is completed; if the air pressure is less than the set threshold, go to step 2); theoretically, since the first and second end units are sealed with the sheath, the structure inside the sheath as a whole has a gap, but relative to the outside world, its interior is sealed, so the ventilation pipe is also in a sealed state. In theory, as the air is inflated, the internal air pressure will increase. If the air pressure does not increase, it means that the sheath is damaged and the damaged part is connected to the outside world.

2) Connect the air inlet pipe to the fan unit and blow air continuously; the airflow generated by the fan will pass through the ventilation pipe and out of the air outlet, pass through the gap between the ridge and the wrapping sleeve, and pass through the rat repellent bag to emit the smell of the rat repellent. The airflow is relatively slow and comes out from the damaged part of the sheath, thus preventing the damaged part from being further bitten and enlarged.

3) Inspect the control cable and find the damaged position of the sheath;

4) Clean the damaged area and fill it with rodent repellent;

5) Use wrapping tape to wrap the damaged part;

6) A protective tube is used to surround the control cable, and a sealant is filled between the protective tube and the sheath; the protective tube includes two semi-circular cylindrical tubes 14, and the two semi-circular cylindrical tubes are fixedly connected by bolts and nuts. Both sides of the semi-circular cylindrical tubes have multiple installation grooves 14.1, and the installation grooves have installation through holes 14.2. The wrapping tape is a glass fiber wrapping tape or a non-woven fabric wrapping tape; the protective tube is made of stainless steel material or PVC material;

7) Remove the fan unit and the maintenance is completed.

Therefore, the cable can be checked regularly to see if the sheath is damaged. When wear occurs, the damaged part can be prevented from getting bigger by connecting the fan (even if the sheath is not repaired temporarily, the smell of the rodent repellent can prevent further biting). And subsequent maintenance is more convenient. And when the wrapping sleeve is damaged (because the wrapping sleeve is in sections), the old wrapping sleeve can be removed, a new one can be installed, and then the rodent repellent can be filled, wrapped again, and then the protective tube can be installed. In this way, the damaged part can be well repaired to avoid further damage.

Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims (10)

1. The utility model provides an anti ultraviolet protection against rodents ant B1 level fire-retardant control cable for track traffic, its characterized in that includes outer sheath, armor, interior sheath, shielding layer and around the covering from outside to interior in proper order, have a plurality of cable cores in the around covering, the cable core includes insulating layer, fire-resistant fire-retardant layer and conductor from outside to interior in proper order.

2. The anti-ultraviolet, rat and termite resistant and B1 level flame retardant control cable for rail transit of claim 1, wherein the armor layer is a steel tape armor layer, the shielding layer is a copper wire braided shielding layer, the insulating layer is a polyethylene insulating layer, the flame retardant layer is a low smoke halogen-free flame retardant layer, and the wrapping layer is a mica wrapping tape layer; the outer protective layer is a crosslinked polyethylene outer protective layer; the inner protective layer is a polyethylene inner protective layer.

3. The anti-ultraviolet, rat and termite resistant, B1 grade flame retardant control cable for rail transit of claim 1 comprising a surrounding layer, four pipe units, four bite resistant units, two wrapping units, and a jacket wrapping the two wrapping units; the outer side wall of the surrounding layer is provided with four first accommodating grooves and four second accommodating grooves, the four first accommodating grooves are distributed in an annular equidistant manner, the four second accommodating grooves are distributed in an annular equidistant manner, the four first accommodating grooves and the four second accommodating grooves are alternately distributed, and ribs extending along the length direction of the cable core are formed between the adjacent first accommodating grooves and the adjacent second accommodating grooves; the wrapping unit comprises a connecting belt and a plurality of wrapping sleeves which are fixedly bonded with the connecting belt and distributed along the length direction of the connecting belt, the cross section of each wrapping sleeve is semicircular, a first groove part and two second groove parts are formed in the inner side of each wrapping sleeve, the first groove part is provided with a connecting belt groove for accommodating the connecting belt, the two second groove parts of each wrapping sleeve are respectively positioned at two side edges of each wrapping sleeve, a pipe accommodating space can be formed between each first groove part and a first accommodating groove facing the corresponding groove part, and a pipe accommodating space can be formed between each two second groove parts which are close to each other and each first accommodating groove facing the corresponding second groove part; the pipeline unit comprises a ventilation pipe and two side wing parts, the ventilation pipe is positioned in the pipe accommodating space, the side wing parts are fixedly connected with the ventilation pipe, two air exhaust holes are formed in the ventilation pipe, and the side wing parts are positioned between the wrapping sleeve and the convex edges; each anti-biting unit is accommodated in one second accommodating groove and comprises a connecting sheet extending along the cable core direction and a plurality of rat-repelling bags distributed along the length direction of the connecting sheet and bonded and fixed with the connecting sheet, and each rat-repelling bag comprises a strip-shaped bag with air holes and a rat repellent agent positioned in the strip-shaped bag.

4. The anti-ultraviolet, rat and termite resistant B1 grade flame retardant control cable for rail transit of claim 3 wherein the strip bag is a gauze bag; the connecting belt and the connecting sheet are both made of PVC materials; the pipeline unit is made of PVC material; the sheath is a crosslinked polyethylene sheath; the rodenticide comprises capsaicin.

5. The anti-ultraviolet, rat and termite resistant, B1 stage flame retardant control cable for use in rail transit of claim 3, comprising a first end unit and a second end unit, the first end unit comprising a circular chamber, a protruding chamber fixedly connected and in communication with the circular chamber, a first outer annular containment board connected to the circular chamber, a first inner annular containment board connected to the circular chamber, an air inlet duct in communication with the protruding chamber, and four cannulas in communication with the circular chamber, each cannula being inserted into one of the ventilation ducts; the first outer annular surrounding plate surrounds the sheath with sealant therebetween, and the first inner annular surrounding plate surrounds the outer protective layer with sealant therebetween; the second end unit comprises an annular end plate, a second outer annular surrounding plate fixedly connected with the annular end plate, a second inner annular surrounding plate fixedly connected with the annular end plate and four plugging rods fixedly connected with the annular end plate, each plugging rod is inserted into a ventilation pipe, the second outer annular surrounding plate surrounds the sheath and is provided with sealant between the sheath and the sheath, and the second inner annular surrounding plate surrounds the outer sheath and is provided with sealant between the outer sheath and the sheath.

6. The anti-ultraviolet, rat and termite resistant and B1 grade flame retardant control cable for rail transit of claim 5 wherein the inner side of the first outer annular surrounding plate, the inner side of the first inner annular surrounding plate, the inner side of the second outer annular surrounding plate and the inner side of the second inner annular surrounding plate are provided with a plurality of semi-cylindrical ribs.

7. A method for preparing the ultraviolet-proof rat-proof and termite-proof B1-level flame-retardant control cable for rail transit based on the method in claim 5, which is characterized by comprising the following steps:

1) Preparing the cable core, the pipeline unit, the anti-biting unit, the wrapping unit, the first end unit and the second end unit; the preparation method of the bite-preventing unit comprises the steps of preparing a connecting sheet and a plurality of rat-repelling bags, and distributing the plurality of rat-repelling bags in a row and bonding and fixing the plurality of rat-repelling bags with the connecting sheet; the preparation method of the wrapping unit comprises the steps of preparing a connecting belt and a plurality of wrapping sleeves, and distributing the plurality of wrapping sleeves in a row and bonding and fixing the plurality of wrapping sleeves with the connecting belt;

2) Wrapping a plurality of cable cores to prepare a wrapping layer, preparing a shielding layer outside the wrapping layer, preparing an inner protecting layer outside the shielding layer, preparing an armor layer outside the inner protecting layer, preparing an outer protecting layer outside the armor layer, and extruding a surrounding layer outside the outer protecting layer;

3) Four anti-biting units and four pipeline units are installed, two wrapping units are used for wrapping, and the sheath is extruded;

4) The first end unit and the second end unit are respectively installed at both ends of the cable.

8. A maintenance method based on the anti-ultraviolet, rat-proof and termite-proof B1-level flame-retardant control cable for rail transit as claimed in claim 5, which is characterized by comprising the following steps:

1) The air inlet pipe is inflated by an inflation unit capable of detecting air pressure, and after the air inlet pipe is inflated for a set time, if the air pressure is greater than or equal to a set threshold value, maintenance is finished; if the air pressure is less than the set threshold value, entering step 2);

2) Connecting an air inlet pipe with the fan unit and continuously blowing air;

3) Inspecting the control cable to find the damaged position of the sheath;

4) Cleaning the damaged position and filling a rodenticide;

5) Wrapping the damaged position by using a wrapping belt;

6) Surrounding the control cable by using a protective tube, and filling sealant between the protective tube and the sheath; the protection tube comprises two semicircular cylindrical tubes which are fixedly connected through bolts and nuts;

7) And taking out the fan unit, and ending maintenance.

9. The maintenance method according to claim 8, wherein both sides of the semicircular cylindrical pipe have a plurality of installation grooves, and the installation grooves have installation through holes therein.

10. The maintenance method according to claim 8, wherein the wrapping tape is a glass fiber wrapping tape or a nonwoven fabric wrapping tape; the protective tube is made of stainless steel material or PVC material.