CN116246825A - A special cable for intelligent monitoring of rail transit and its production process - Google Patents

Abstract

The invention discloses a special cable for intelligent monitoring of rail transit and a production process thereof, and relates to the field of cables, including a special cable and a cable core with high toughness, which is made of annealed copper; the volume resistance is 10-100Ω/cm The shielding layer is made of vinyl acetate copolymer; and the outer wall of the shielding layer is covered with a protective layer to adapt to high temperature and cold. A special cable for intelligent monitoring of rail transit and its production process described in the present invention, the material of the shielding layer of the special cable is a vinyl acetate copolymer, and the volume resistance of the material is generally 10~100Ω/cm, which can be used for rated Power cables with a voltage greater than 1kv fully meet the needs of special cables for intelligent monitoring; the normal melting point of the protective layer is 220°C, while the normal melting point of the shielding layer is 380°C, so the difference in melting points fully meets the requirements of the sequential coating sequence In order to meet the production needs, injection molding can be used for one-time molding to maximize the production efficiency of special cables.

Description

A special cable for intelligent monitoring of rail transit and its production process

technical field

The invention relates to the field of cables, in particular to a special cable for intelligent monitoring of rail transit and a production process thereof.

Background technique

Special cables are a series of products with unique properties and special structures. Compared with ordinary wires and cables with a large quantity and a wide range, they have the characteristics of higher technical content, stricter conditions of use, smaller batches, and higher added value; often Adopt new materials, new structures, new processes and new design calculations.

In view of the special use environment of cables in rail transportation, such as underground railways are mostly in humid environments, or high-altitude sky roads are exposed outdoors, the environment used is relatively harsh, and the use intensity of cables used for monitoring purposes is relatively high to avoid monitoring disconnection; The anti-magnetic shielding effect of monitoring cables is the first to bear the brunt, and considering the above-mentioned use environment, such as severe cold and hot areas, or places where acid rain is frequent, the protection of the cables should also be considered;

In order to ensure the high protection of the cable, the outer layer of the cable is usually covered by plastic extrusion, so that the cable protective layer can better fit the outer edge of the cable core to achieve the best protection. In view of the special cable In the process of coating the cable protective layer, it is also necessary to make a reasonable calculation of the order of the coating. For example, the selected coating materials are different, the melting point is different, and the single injection molding Correspondingly, if the melting points of adjacent layers differ greatly, in the process of secondary coating, the time of secondary separate coating is too long, which may lead to insufficient adhesion of inner and outer layers. In order to solve the above problems, We propose a special cable for intelligent monitoring of rail transit and its production process.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a special cable for intelligent monitoring of rail transit and its production process, which has the advantages of high service strength, integrated injection molding coating, and improved production efficiency, and can effectively solve the problems in the background technology. The problem.

In order to achieve the above object, the technical solution adopted by the present invention is: a special cable for intelligent monitoring of rail transit and its production process, including the special cable, and also including

Cable core with high toughness, made of annealed copper;

The shielding layer with a volume resistance of 10~100Ω/cm is made of vinyl acetate copolymer;

And the protective layer coated on the outer wall of the shielding layer to adapt to high temperature and cold.

Preferably, it includes an injection molding module for injection molding of the shielding layer and the protective layer on the special cable;

The injection molding module includes a mold base, and the upper end of the mold base is provided with a front mold and a rear mold for injection molding of the shielding layer and the protective layer respectively, and the upper end of the mold base is provided with a mold for matching on one side of the front mold and the rear mold. The transmission part is used to control its injection and discharge, and a connecting part for stable connection is arranged between the front mold and the rear mold.

Preferably, the front mold includes a bottom mold, and the inside of the bottom mold is provided with ejector pins for the more serious cable ejection, and the top of the bottom mold is provided with a front inner mold for injection molding of the shielding layer, and the front The upper and lower ends of the inner mold are provided with water-cooled mold sleeves for assisting its cooling, and a top mold is arranged at the upper end of one of the water-cooled mold sleeves above the front inner mold.

Preferably, the front inner mold includes a front inner bottom mold, and the upper end of the front inner bottom mold is provided with a front inner top mold conforming to its structure, and the front inner top mold runs through the middle part of the top end to the middle part of the lower end. The injection port where the vinyl acetate copolymer melt enters;

The opposite sides of the front inner bottom mold and the front inner top mold are all provided with a cavity one, and the input ends of the two sets of cavity ones are all provided with through grooves matching the cable core structure, the front inner bottom mold, The middle part of the tail end of the front inner top mold is all provided with a spacer one, and two spacers one is away from the front inner top mold and an end both sides of the cavity one are provided with an outer cylinder one for guiding material and communicating with it.

Preferably, one end of the two spacers one near the front inner top mold and the cavity one is provided with slots, and the inner walls of the two slots are provided with holes for the two spacers one and the front inner bottom mold and the front inner Insertion plate 1 blocked by the top mold;

The side view structure of the said flashboard 1 is "L" shape, and the left and right sides of the upper part of the vertical section of the flashboard 1 are provided with through holes of the same size as the two cavity 1, and the four outer cylinders 1 are respectively far away from each other. One end corresponding to the compartment one is provided with a socket connected to the input end of the rear mold.

Preferably, the rear inner mold includes a rear inner bottom mold and a rear inner top mold, and the inner walls of the rear inner top mold and the rear inner bottom mold are all provided with cavity two for injection molding of the protective layer. The rear inner top mold, The other end of the rear inner bottom mold is all provided with two partitions for discharging and guiding materials, and between the two partitions are provided with two inserting plates for blocking.

Preferably, the left and right sides of one end of the rear inner top mold and the rear inner bottom mold are also provided with two outer cylinders for guiding materials, and the ends of the four outer cylinders far away from the rear inner top mold and the rear inner bottom mold are all provided with There are plug connectors that match the configuration of the four socket connectors.

Preferably, the transmission part includes its main body cylinder, and the output end of the cylinder is provided with a connecting frame with an "n"-shaped structure in a top view, and the front ends of the two sides of the connecting frame are provided with the first and second boards. Structurally compatible sockets.

Preferably, the connecting piece includes fixing clips that match the structures of the two sets of outer tubes 1 and 2, and side frames are provided on different sides of the two sets of fixing clips, and a side frame is arranged between the two side frames There are tightening screws for adjusting its tightness.

A production process for a special cable for intelligent monitoring of rail transit, comprising the following steps:

S100. Module assembly: The operator first assembles the two front molds and the rear mold separately, and then places the front mold, the rear mold and the transmission parts on the upper end of the mold base, and at the same time connects the output end of the front mold to the input of the rear mold. End butt joint, in this process, two sets of connectors are used to make the butt joint between the front mold and the rear mold more stable;

S200. Feeding injection molding: After the injection molding module is assembled, the operator can use the conveying mechanism to send the two cable cores into the inside of the front inner mold through the two through slots respectively. The previous two slots should be closed based on the insert plate state, and then the vinyl acetate copolymer melt is injected from the upper end of the front mold to form an injection molding coating;

S300, secondary injection molding: after auxiliary cooling by two water-cooled mold sleeves, the shielding layer is overmolded on the outer wall of the cable core. The two through holes of the two outer cylinders are opposite to the two outer cylinders. At this time, under the action of the conveying mechanism, the batch of shielding layers and cable cores can be sent from the two outer cylinders to the rear inner mold based on the two spacers. Internal secondary injection molding;

S301. Based on step S300, the secondary injection molding step inside the rear inner mold is similar to step S200;

Among them, vinyl acetate copolymer melting material is replaced by silicone rubber melting material

Compared with the prior art, the present invention provides a special cable for intelligent monitoring of rail transit and its production process, which has the following beneficial effects:

1. The special cable for intelligent monitoring of rail transit and its production process, the material of the shielding layer of the special cable is vinyl acetate copolymer, and the volume resistance of this material is generally 10~100Ω/cm, which can be used for rated voltage greater than The 1kv power cable fully meets the needs of special cables for intelligent monitoring.

2. The special cable for intelligent monitoring of rail transit and its production process, the protective layer of the special cable is made of silicone rubber, which has the characteristics of heat radiation resistance, cold resistance, acid and alkali resistance, corrosive gas resistance, waterproof and other characteristics, and the structure is soft. Easy laying, stable electrical performance in high temperature (alpine) environment, outstanding anti-aging performance, and long service life.

3. The normal melting point of the protective layer is 220°C and the normal melting point of the shielding layer is 380°C for this special cable for intelligent monitoring of rail transit and its production process. The difference in melting points fully conforms to the order of coating In order to meet the production needs, injection molding can be used for one-time molding, which greatly improves the production efficiency of special cables.

4. The special cable for intelligent monitoring of rail transit and its production process, through the injection molding module set, the extrusion temperature of the front mold is lower than the decomposition temperature of the organic peroxide, so that the organic peroxide will decompose Free radicals are generated and cross-linked with the polymer.

5. The special cable for intelligent monitoring of rail transit and its production process, through the set injection molding module, the front mold and the rear mold are stably connected based on two sets of plug joints and socket joints, combined with the upper shielding layer and protection of the special cable The difference in melting point of the layer makes the injection molding production of special cables integrated and greatly saves the production efficiency of special cables.

6. The special cable for intelligent monitoring of rail transit and its production process, through the set transmission parts, the transmission parts drive the first board and the second board to go up and down, so as to realize the injection molding status and output of the front mold and the rear mold. The relative transformation of the material state makes the plastic and discharge control of the front mold and the rear mold more automatic and saves manpower.

7. The special cable for intelligent monitoring of rail transit and its production process, the structure of the first plug board and the second plug board is the same, because of its upper and lower end bending design, so as to limit the position, effectively avoiding the During the process, the cylinder drives the inserting plate to go up and down excessively, resulting in material leakage caused by the separation of the two separate seats.

8. The special cable for intelligent monitoring of rail transit and its production process, through the provided connector, the middle section of the fastening screw is provided with a screw sleeve, so that the operator can tighten it manually without using external tools; The screw is a two-way screw. After the fastening screw is rotated, the two fixing clips slide relative to each other based on the corresponding side frames, so as to realize the stable butt joint of the two sets of outer cylinders 1 and 2, which indirectly guarantees the safety of special cables. Injection molding finished product quality.

Description of drawings

Fig. 1 is a structural analysis diagram of a special cable for intelligent monitoring of rail transit and its production process according to the present invention.

Fig. 2 is a schematic diagram of the overall structure of a special cable for intelligent monitoring of rail transit and an injection molding module for its production process according to the present invention.

Fig. 3 is a second view of the overall structure of a special cable for intelligent monitoring of rail transit and the injection molding module for its production process according to the present invention.

Fig. 4 is a third view of the overall structure of a special cable for intelligent monitoring of rail transit and an injection molding module for its production process according to the present invention.

Fig. 5 is an exploded view of the structure of the front mold of a special cable for intelligent monitoring of rail transit and the injection molding module for its production process according to the present invention.

Fig. 6 is an exploded view of the structure of the front inner mold used in the injection molding module for a special cable for intelligent monitoring of rail transit and its production process according to the present invention.

Fig. 7 is a front view of the front inner mold used for the front mold in the injection molding module for a special cable for intelligent monitoring of rail transit and its production process according to the present invention.

Fig. 8 is an exploded view of the structure of the rear inner mold used in the injection molding module for a special cable for intelligent monitoring of rail transit and its production process according to the present invention.

Fig. 9 is a schematic diagram of assembly of transmission parts in a special cable for intelligent monitoring of rail transit and an injection mold for its production process according to the present invention.

Fig. 10 is a structural schematic diagram of a transmission part in a special cable for intelligent monitoring of rail transit and its injection molding module for production process according to the present invention.

Fig. 11 is a structural schematic diagram of a special cable for intelligent monitoring of rail transit and a connector in an injection module for its production process according to the present invention.

In the picture:

1. Special cables; 2. Injection modules;

11. Cable core; 12. Shielding layer; 13. Protective layer;

21. Die base; 22. Front mold; 23. Rear mold; 24. Transmission parts; 25. Connecting parts;

221, bottom mold; 222, thimble piece; 223, front inner mold; 224, water-cooled mold sleeve; 225, top mold;

2231, front inner bottom mold; 2232, front inner top mold; 2233, cavity one; 2234, through groove; 2235, injection port; 2236, spacer one; 2237, slot; Tube one; 2240, socket head;

231. Back internal model;

2311, rear inner top mold; 2312, rear inner bottom mold; 2313, cavity two; 2314, outer cylinder two; 2315, plug connector; 2316, spacer two; 2317, insert plate two;

241, cylinder; 242, connecting frame; 243, socket;

251, fixed clip; 252, side frame; 253, fastening screw rod.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the following will further elaborate the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the implementation of the present invention. example, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Specific embodiment one

In order to address the deficiencies of the prior art, as shown in Figure 1, the present invention provides a special cable for intelligent monitoring of rail transit, the shielding layer 12 is coated on the outer wall of the cable core 11, and the protective layer 13 is coated on the shielding layer 12 outer walls.

Among them, the material of the shielding layer 12 is vinyl acetate copolymer, and the volume resistance of this material is generally 10~100Ω/cm, which can be used for power cables with a rated voltage greater than 1kv, which fully meets the use requirements of special cables 1 for intelligent monitoring;

The cable core 11 can be made of annealed copper or aluminum, which has good electrical conductivity;

The protective layer 13 is made of silicone rubber, which has the characteristics of heat radiation resistance, cold resistance, acid and alkali resistance, corrosive gas resistance, and waterproof.

The normal melting point of the protective layer 13 is 220°C, while the normal melting point of the shielding layer 12 is 380°C. With this difference in melting point, it fully meets the production requirements of the sequential coating sequence, so the injection mold set 2 can be used for one-time molding, which greatly improves Production efficiency of special cables 1.

As shown in Figures 2 to 4, a special cable for intelligent monitoring of rail transit and an injection molding module 2 for its production process, the lower ends of the front mold 22 and the rear mold 23 are respectively fixedly connected to the left and right sides of the upper end of the mold base 21 , and the output end of the front mold 22 is fixedly connected with the input end of the rear mold 23 through the connector 25, and the two cable cores 11 are sent in by the two input ends of the front mold 22, and a conveying mechanism can be used.

It should be noted that the present invention is a special cable for intelligent monitoring of rail transit and its production process. Before the production of the special cable 1, the injection module 2 is assembled through the injection molding module 2 provided;

In the process of assembling the injection molding module 2, the operator first places the mold base 21 in a suitable position, and the position is as horizontal as possible to ensure the subsequent stable docking of the front mold 22 and the rear mold 23. The operator then places the front mold 22, Back mold 23 is placed on the upper end of mold base 21;

At the same time, the operator fixedly connects the transmission member 24 to the upper end of the die base 21 on one side of the front mold 22 and the rear mold 23, so that the transmission member 24 is connected with the front mold 22 and the rear mold 23, and then the front mold 22 Based on the stable docking of the connecting piece 25 and the rear mold 23;

In the process of special cable production, the operator can use the conveying mechanism to feed the cable core 11 from the front end of the front mold 22, and then inject the vinyl acetate copolymer melt from the upper end of the front mold 22, and pass through the front mold 22 on the cable. The outer wall of the core 11 is co-extruded, and the shielding layer 12 is formed on the outer wall of the cable core 11;

After the injection of the cable core 11 by the front mold 22 of this batch is completed, the operator then injects silicone rubber melt into the upper end of the rear mold 23, and co-presses out the outer wall of the shielding layer 12 through the rear mold 23, so that the protective layer 13 is formed on the outer wall of the shielding layer 12 to produce cables.

Wherein, the extrusion temperature of the front mold 22 is lower than the decomposition temperature of the organic peroxide, so that the organic peroxide will decompose to generate free radicals, and cross-link with the polymer.

Specifically, and as shown in Figure 5, a special cable for rail transit intelligent monitoring and the front mold 22 in the injection molding module 2 for its production process, the lower end of the bottom mold 221 is placed on the upper end side of the mold base 21, It may be a fixed connection, the thimble piece 222 is detachably connected to the inside of the bottom mold 221, and the thimbles on the thimble piece 222 are all penetrated from the inner upper end of the bottom mold 221 to the upper end of the bottom mold 221;

One of the water-cooled mold sleeves 224 below the front inner mold 223 is inserted into the upper end of the bottom mold 221, and the front inner mold 223 is placed between the two water-cooled mold sleeves 224, and the other water-cooled mold sleeve 224 is inserted into one of the water-cooled mold sleeves. The upper end of the die set 224, and the top die 225 is inserted into the upper end of another water-cooled die set 224.

It should be noted that the present invention is a special cable for intelligent monitoring of rail transit and its production process. Before the production of the special cable 1, the front mold 22 and the rear mold 23 must be assembled through the provided front mold 22;

In the process of assembling the front mold 22, the operator first stably places the bottom mold 221 on the upper end of the mold base 21, and then assembles the ejector pin 222 inside the bottom mold 221;

After the thimble part 222 is assembled, one of the water-cooled mold sleeves 224 at the lower end is assembled on the upper end of the bottom mold 221, and then the front inner mold 223 is placed on the upper end of the water-cooled mold sleeve 224, and then the other water-cooled mold sleeve 224 at the upper end is assembled. The water-cooling mold sleeve 224 is assembled on the upper end of the front inner mold 223, and finally the top mold 225 is assembled on the upper end of the water-cooling mold sleeve 224;

The assembling process of rear mold 23 is the same as the assembling process of above-mentioned front mold 22;

In the process of producing the special cable 1, the previous two water-cooled mold sleeves 224 should be externally connected with circulating water, the cable core 11 is fed in from one end of the front inner mold 223, and the vinyl acetate copolymer melt is injected from the upper end of the top mold 225 The inside of the front inner mold 223 is injection-molded, and the shielding layer 12 on the outer wall of the cable core 11 is overmolded after the molten material is effectively cooled by the two water-cooled mold sleeves 224 .

Wherein, the structures of the two water-cooling mold sleeves 224 are designed to be open to cope with the structural characteristics of the front inner mold 223 .

Further, as shown in Figures 6 to 8, a special cable for rail transit intelligent monitoring and its production process are used in the injection molding module 2 in the front mold 22, the rear mold 23, the front inner mold 223 and the rear inner mold 231, the front inner top mold 2232 is inserted into the upper end of the front inner bottom mold 2231, and the two spacers one 2236 are detachably connected to the middle part of the front inner top mold 2232 and the cavity one 2233 tail end respectively;

Insertion plate 1 2238 is inserted between two spacers 1 2236, front inner top mold 2232 and front inner bottom mold 2231 based on two slots 2237, and is slidably connected with them. One end of four outer cylinders 2239 is respectively welded to The left and right sides of the outer ends of the two spacers one 2236, and the four joints 2240 are respectively opened by the outer ends of the four outer cylinders one 2239;

The structural connection mode and the installation mode of the rear inner mold 231 are similar to the structural connection mode and the installation mode of the front inner mold 223 .

It should be noted that the present invention is a special cable for intelligent monitoring of rail transit and its production process. By setting the front inner mold 223 and the rear inner mold 231, during the injection molding process of the shielding layer 12 on the special cable 1 , the two cable cores 11 are respectively sent in from the two through slots 2234;

Simultaneously, vinyl acetate copolymer molten material enters the interior of front inner bottom mold 2231 and front inner top mold 2232 by injection port 2235 and flows through two cavity one 2233, to realize the outer wall cladding of cable core 11, before this, insert Board one 2238 blocks two compartments one 2236 based on slot 2237;

After the cooling of the shielding layer 12 is completed, the operator drives the plate 1 2238 down by controlling the transmission part 24, so that the through holes on it communicate with the two outer cylinders 1 2239 respectively, and at this time the cable core 11 can be connected The shielding layer 12 is sent to the rear inner mold 231 by two outer cylinders one 2239;

After the shielding layer 12 is injection molded by the front mold 22, the cable core 11 together with the shielding layer 12 is sent into the rear inner top mold 2311 and the rear inner bottom mold 2312 by the outer cylinder two 2314, and is located between the two cavity two 2313 After the length of the cable core 11 is suitable, the principle is the same as above. Silicone rubber melt is injected from the upper end of the rear mold 23 to overmold the outer wall of the shielding layer 12. The previous two spacers 2316 should be based on the insert plate 2. 2317 is in closed state;

After the protective layer 13 is cooled and formed, similarly, the operator drives the plate 2 2317 down by controlling the transmission part 24, so that the two through holes on it communicate with the spacer 2 2316, and then the formed special cable 1 to send.

Among them, the front mold 22 and the rear mold 23 are stably connected based on the two sets of plug joints 2315 and socket joints 2240, combined with the differences in melting points of the upper shielding layer 12 and protective layer 13 of the special cable 1, the injection molding production of the special cable 1 is integrated. Significantly save the production efficiency of special cables 1.

Specifically, as shown in Figures 9 and 10, a transmission member 24 in the injection molding module 2 for a special cable for intelligent monitoring of rail transit and its production process, the lower end of the cylinder 241 is fixedly connected to the upper end of the mold base 21, And the middle part of the lower end of the middle section of the connecting frame 242 is detachably fixedly connected to the output end of the cylinder 241, and the two sockets 243 are opened by the front ends of the two sides of the connecting frame 242 respectively, and the two sockets 243 are respectively sleeved on the sockets. The outer walls of board one 2238 and board two 2317.

It should be noted that the present invention is a special cable for intelligent monitoring of rail transit and its production process. Through the transmission part 24, in the process of assembling the injection molding module 2, the operator first fixes the cylinder 241 on the The upper end of the mold base 21, and then the two sockets 243 on which the connecting frame 242 is based are respectively inserted into the outer walls of the first plate 2238 and the second plate 2317, and the connecting frame 242 is fixedly connected to the output end of the cylinder 241 can;

During the injection molding process of the special cable 1, the operator controls the opening and closing of the cylinder 241 to realize the upward and downward control of the first board 2238 and the second board 2317.

Wherein, the first plate 2238 and the second plate 2317 are driven up and down by the transmission part 24, so as to realize the relative transformation between the injection molding state and the discharge state of the front mold 22 and the rear mold 23, so that the plastics of the front mold 22 and the rear mold 23 , The discharge control is more automatic and saves manpower;

The first plate 2238 is identical in structure to the second plate 2317, because the upper and lower ends are bent to limit the position, effectively avoiding the excessive upward and downward movement of the first plate 2238 driven by the cylinder 241 during the transmission process, resulting in their separation. Leakage formed by the disengagement of two spacers one 2236.

Specifically, as shown in Figure 11, a special cable for rail transit intelligent monitoring and the connector 25 in the injection module 2 for its production process, four fixing clips 251 are respectively sleeved in two sets of outer cylinders 2239 1. The outer wall of the outer cylinder 2314 is detachable, and the four side frames 252 are respectively fixedly connected to the different sides of the four fixing clips 251, and the two side sections of the two fastening screws 253 are respectively screwed to the corresponding The middle section of the two side frames 252.

It should be noted that the present invention is a special cable for intelligent monitoring of rail transit and its production process. Through the connector 25 provided, in the process of assembling the front mold 22 and the rear mold 23, the front mold 22 and the rear mold 23 are assembled. After the mold 23 is docked, the two plug joints 2315 should be plugged into the inner walls of the corresponding joints 2240 respectively;

The operator should fix the four fixing clips 251 to the outer walls of the two sets of outer cylinder one 2239 and outer cylinder two 2314 respectively before. To ensure the docking stability, the operator screws the two ends of the two fastening screws 253 into the middle sections of the corresponding two side frames 252 and tightens them, so as to realize the butt joint stability of the front mold 22 and the rear mold 23.

Wherein, the middle section of the fastening screw 253 is provided with a swivel, so that the operator can tighten it manually without using external tools; Based on the relative sliding of the corresponding side frame 252 , the two sets of outer cylinder one 2239 and outer cylinder two 2314 are stably connected, which indirectly guarantees the quality of the injection molded product of the special cable 1 .

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention.

Claims (10)

1. A special cable for intelligent monitoring of rail transit, including a special cable (1), characterized in that: it also includes The cable core (11) with high toughness is made of annealed copper; The shielding layer (12) with a volume resistance of 10-100Ω/cm is made of vinyl acetate copolymer; And a protective layer (13) coated on the outer wall of the shielding layer (12) to adapt to high temperature and cold. 2. A production process for the special cable for intelligent monitoring of rail transit according to claim 1, characterized in that: it includes injection molding of the shielding layer (12) and protective layer (13) on the special cable (1) Covered injection molding module (2); The injection molding module (2) includes a mold base (21), and the upper end of the mold base (21) is provided with a front mold (22) and a rear mold ( 23), the upper end of the mold base (21) is provided with a transmission member (24) for controlling its injection and discharge on one side of the front mold (22) and the rear mold (23), and the front mold (22) 1. A connecting piece (25) for stable connection is arranged between the rear molds (23). 3. The production process of a special cable for intelligent monitoring of rail transit according to claim 2, characterized in that: the front mold (22) includes a bottom mold (221), and the interior of the bottom mold (221) is set There are thimble parts (222) used for more serious cable ejection, and the top of the bottom mold (221) is provided with a front inner mold (223) for injection molding of the shielding layer (12), and the front inner mold (223) The upper and lower ends of the upper and lower ends are all provided with water-cooled mold sleeves (224) for assisting its cooling, and a top mold (225) is arranged on the upper end of one of the water-cooled mold sleeves (224) above the front inner mold (223). 4. The production process of a special cable for intelligent monitoring of rail transit according to claim 3, characterized in that: the front inner mold (223) includes a front inner bottom mold (2231), and the front inner bottom mold ( The upper end of 2231) is provided with a front inner top mold (2232) matching its structure, and the front inner top mold (2232) runs through the middle of its top end to the middle of its lower end, and is provided with an injection mold for vinyl acetate copolymer melt to enter. mouth(2235); The opposite sides of the front inner bottom mold (2231) and the front inner top mold (2232) are provided with a cavity one (2233), and the input ends of the two sets of cavity one (2233) are provided with a cable core (11 ) structure fit through slot (2234), the middle part of the tail end of the front inner bottom mold (2231) and the front inner top mold (2232) are provided with a spacer one (2236), and two spacers one (2236 ) away from the front inner top mold (2232) and one end of cavity one (2233) are provided with outer cylinder one (2239) for guiding materials and communicating with it. 5. The production process of a special cable for intelligent monitoring of rail transit according to claim 4, characterized in that: the two spacers one (2236) are adjacent to the front inner top mold (2232), cavity one ( 2233) are provided with slots (2237) at one end, and the inner walls of the two slots (2237) are provided with two spacers (2236) and front inner bottom mold (2231), front inner top mold (2232) Barrier board one (2238); The side view structure of the first board (2238) is "L" shaped, and the left and right sides of the upper section of the vertical section of the first board (2238) are provided with through holes of the same size as the two cavity one (2233), The ends of the four outer cylinders 1 (2239) away from the corresponding seats 1 (2236) are provided with sockets (2240) connected to the input ends of the rear mold (23). 6. The production process of a special cable for intelligent monitoring of rail transit according to claim 5, characterized in that: the rear inner mold (231) includes a rear inner bottom mold (2312), a rear inner top mold (2311 ), and the inner walls of the rear inner top mold (2311) and the rear inner bottom mold (2312) are provided with cavity two (2313) for injection molding of the protective layer (13), the rear inner top mold (2311), the rear inner The other end of the bottom mold (2312) is provided with two partitions (2316) for discharging and guiding materials, and between the two partitions (2316) are provided with two inserting plates (2317) for blocking. 7. The production process of a special cable for intelligent monitoring of rail transit according to claim 6, characterized in that: the left and right sides of one end of the rear inner top mold (2311) and the rear inner bottom mold (2312) are also There are two outer cylinders (2314) for material guide, and one end of the four outer cylinders (2314) far away from the rear inner top mold (2311) and the rear inner bottom mold (2312) is provided with four joints (2240 ) with matching plug connectors (2315). 8. The production process of a special cable for intelligent monitoring of rail transit according to claim 7, characterized in that: the transmission part (24) includes its main body cylinder (241), and the output end of the cylinder (241) A connecting frame (242) with an "n"-shaped structure in a top view is provided, and the front ends of the two side sections of the connecting frame (242) are provided with plugging boards that match the structure of the first board (2238) and the second board (2317). socket (243). 9. The production process of a special cable for intelligent monitoring of rail transit according to claim 8, characterized in that: the connecting piece (25) includes two sets of outer cylinder one (2239), outer cylinder two (2314 ) fixed clips (251) with the same structure, and side frames (252) are provided on the different sides of the two sets of fixed clips (251), and there is a set between the two side frames (252) for adjusting the tightness Solid fastening screw (253). 10. The production process of a special cable for intelligent monitoring of rail transit according to claim 9, characterized in that: comprising the steps of: S100, module assembly: the operator first assembles the two front molds (22) and the rear mold (23) respectively, and then places and fixes the front mold (22), the rear mold (23) together with the transmission part (24) on the mold base (21), while connecting the output end of the front mold (22) with the input end of the rear mold (23), in the process, through two sets of connectors (25) to make the front mold (22), the rear mold (23) The docking is more stable; S200. Feeding injection molding: After the injection molding module (2) is assembled, the operator can send the two cable cores (11) into the front inner mold (223) through the two through slots (2234) respectively by means of the conveying mechanism, The previous two slots (2237) should be closed based on the first plate (2238), and then the vinyl acetate copolymer melt is injected from the upper end of the front mold (22) to form an injection molding coating; S300, secondary injection molding: After auxiliary cooling by two water-cooled mold sleeves (224), the shielding layer (12) is overmolded on the outer wall of the cable core (11). At this time, the operator controls the opening and closing of the cylinder (241) to Drive the board one (2238) to go down, so that the two through holes on the board one (2238) are opposite to the two outer cylinders one (2239). At this time, the batch shielding layer ( 12) The joint cable core (11) is sent into the interior of the rear inner mold (231) by two outer cylinders one (2239) and based on two spacers two (2316) to realize secondary injection molding; S301, based on step S300, the secondary injection molding step inside the rear inner mold (231) is similar to step S200; Wherein, vinyl acetate copolymer melting material is replaced by silicone rubber melting material.

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