Special cable for intelligent monitoring of rail transit and production process thereof

Abstract

The application discloses a kind of special cable for intelligent monitoring of rail transit and production process thereof, it is related to cable field, including special cable, further including cable core with high toughness, made of annealed copper;Shielding layer with volume resistance of 10~100Ω / cm, made of vinyl acetate copolymer;And the protective layer of high temperature, high cold adaptation coated on the outer wall of shielding layer.The special cable for intelligent monitoring of rail transit and production process thereof, the material of special cable, shielding layer is vinyl acetate copolymer, the volume resistance of this material is generally 10~100Ω / cm, can be used for power cable with rated voltage greater than 1kv, completely meet the use demand of special cable in intelligent monitoring;Normal melting point of protective layer is 220 DEG C, and normal melting point of shielding layer is 380 DEG C, with this melting point difference, completely meet the production demand of successive coating sequence, so one forming can be carried out using injection molding module, the production efficiency of special cable is maximized.

Description

Technical Field

[0001] This invention relates to the field of cables, specifically to a special cable for intelligent monitoring in rail transit and its manufacturing process. Background Technology

[0002] Specialty cables are a series of products with unique properties and special structures. Compared with ordinary wires and cables, which are produced in large quantities and widely used, they have higher technical content, stricter usage conditions, smaller batch sizes, and higher added value. They often use new materials, new structures, new processes, and new design calculations.

[0003] Given the special operating environment of cables in rail transit, such as the humid environment of subways or the outdoor exposure of high-altitude sky bridges, the operating environment is relatively harsh. In addition, the strength of cables used for monitoring is relatively high to avoid monitoring disconnection. The anti-magnetic shielding effect of monitoring cables is the top priority. Considering the above-mentioned operating environments, such as extremely cold and hot areas or areas with frequent acid rain, the protective properties of the cables should also be considered.

[0004] To ensure high protection of cables, plastic extrusion is commonly used to coat the outer layer of the cable, allowing the protective layer to better adhere to the outer edge of the cable core and achieve optimal protection. Given the multiple protective layers of special cables, their coatings are inevitably multiple. During the production process of coating the cable protective layers, it is also necessary to reasonably calculate the order of coating. For example, different coating materials have different melting points, and the injection temperature of a single layer will also be different. Correspondingly, if the melting points of adjacent layers differ significantly, if the time for separate coating during the secondary coating process is too long, it may lead to insufficient adhesion between the inner and outer layers. To solve the above problems, we propose a special cable for intelligent monitoring in rail transit and its production process. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a special cable for intelligent monitoring in rail transit and its manufacturing process, which has advantages such as high strength, integrated injection molding coating, and improved production efficiency, and can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a special cable for intelligent monitoring in rail transit and its manufacturing process, comprising a special cable, and further comprising...

[0007] The cable core, made of annealed copper, possesses high toughness;

[0008] The shielding layer, with a volume resistivity of 10~100Ω / cm, is made of vinyl acetate copolymer;

[0009] And a protective layer covering the outer wall of the shielding layer to adapt to high temperature and extreme cold.

[0010] The injection mold set is preferably used for injection molding of a shielding layer and a protective layer of a special cable.

[0011] The injection mold set comprises 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.

[0012] The front mold comprises a bottom mold, and the inside of the bottom mold is provided with a ejector pin for ejecting a cable with more serious adhesion.

[0013] The upper end of the front inner bottom mold is provided with a front inner top mold matching the structure thereof.

[0014] The opposite sides of the front inner bottom mold and the front inner top mold are provided with a cavity one, and the input ends of the two cavities one are provided with a through groove matching the structure of a cable core.

[0015] The tail end middle parts of the front inner bottom mold and the front inner top mold are provided with a partition one, and the two sides of the end of each partition one away from the front inner top mold and the cavity one are provided with an outer cylinder one for guiding material and communicating with the partition one.

[0016] The side view structure of the insertion plate one is in the shape of "L", and the left and right sides of the vertical section of the insertion plate one are provided with through holes with a size corresponding to the two cavities one.

[0017] The rear inner mold comprises 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 provided with a cavity two for injection molding of the protective layer.

[0018] The left and right sides of the end of the rear inner top mold and the rear inner bottom mold are also provided with an outer cylinder two for guiding material, and the end of each outer cylinder two away from the rear inner top mold and the rear inner bottom mold is provided with a plug-in head matching the structure of the four receiving heads.

[0019] Preferably, the transmission member includes a main body cylinder, and the output end of the cylinder is provided with a connecting frame in the shape of ''n'' in plan view, and the front end of the two side sections of the connecting frame is provided with a plug-in seat matching the structure of the plug-in plate one and the plug-in plate two.

[0020] Preferably, the connecting member includes a fixing clamp matching the structure of the two groups of outer cylinders one and two, and the different sides of the two groups of fixing clamps are provided with side frames, and the two side frames are provided with a fastening screw for adjusting the fastening.

[0021] A production process of a special cable for intelligent monitoring of rail transit, comprising the following steps:

[0022] S100, module assembly: the operator first assembles two front modules and rear modules, and then places the front module and the rear module together with the transmission member on the upper end of the mold base, and at the same time, the output end of the front module is connected with the input end of the rear module, and in this process, the two connecting members are used to make the connection of the front module and the rear module more stable.

[0023] S200, feeding and injection molding: after the injection molding module is assembled, the operator can use the conveying mechanism to feed the two cable cores into the inside of the front inner mold through the two through grooves, and the two insertion grooves should be in a closed state based on the plug-in plate one, and then the ethylene-vinyl acetate copolymer melt is injected from the upper end of the front module to form an injection molding cover;

[0024] S300, secondary injection molding: after being cooled by the two water-cooled mold sleeves, the shielding layer is formed on the outer wall of the cable core, at this time, the operator controls the opening and closing of the gas cylinder to drive the plug-in plate one downward, so that the two through holes on the plug-in plate one are opposite to the two outer cylinders one, and at this time, the shielding layer and the cable core of this batch can be fed into the inside of the rear inner mold through the two outer cylinders one and the two spacer seats two based on the conveying mechanism to realize secondary injection molding;

[0025] S301, based on step S300, the secondary injection step in the rear inner mold is similar to step S200;

[0026] In which, the ethylene-vinyl acetate copolymer melt is replaced by a silicone rubber melt

[0027] Compared with the prior art, the present application provides a special cable for intelligent monitoring of rail transit and a production process thereof, which has the following beneficial effects:

[0028] 1. The special cable for intelligent monitoring of rail transit and the production process thereof, the material of the shielding layer is ethylene-vinyl acetate copolymer, the volume resistance of which is generally 10-100 Ω / cm, which can be used for power cables with a rated voltage greater than 1kv, and completely meets the use requirements of special cables for intelligent monitoring.

[0029] 2. The special cable for intelligent monitoring of rail transit and its production process, the special cable, the protective layer is made of silicone rubber, has the characteristics of heat radiation resistance, cold resistance, acid and alkali resistance, corrosion resistance, water resistance, etc., the structure is soft, convenient to lay, the electrical performance is stable in high temperature (high cold) environment, the anti-aging performance is outstanding, and the service life is long.

[0030] 3. The special cable for intelligent monitoring of rail transit and its production process, the normal melting point of the protective layer is 220 DEG C, and the normal melting point of the shielding layer is 380 DEG C, so that the production demand of the coating sequence is met, and one-time molding is realized by using the injection molding module, so that the production efficiency of the special cable is greatly improved.

[0031] 4. The special cable for intelligent monitoring of rail transit and its production process, the extrusion temperature of the front mold is lower than the decomposition temperature of the organic peroxide, so that the organic peroxide is decomposed to generate free radicals, and crosslinking occurs with the polymer.

[0032] 5. The special cable for intelligent monitoring of rail transit and its production process, the front mold and the rear mold are stably connected based on the two groups of plug-in connectors and the receiving connectors, and the melting point difference of the shielding layer and the protective layer of the special cable is combined, so that the injection molding production of the special cable is integrated, and the production efficiency of the special cable is greatly saved.

[0033] 6. The special cable for intelligent monitoring of rail transit and its production process, the transmission member is provided, the transmission member drives the plug-in plate one and the plug-in plate two to move up and down, the injection molding state and the discharging state of the front mold and the rear mold are relatively changed, and the plastic and discharging control of the front mold and the rear mold is more automatic and more labor-saving.

[0034] 7. The special cable for intelligent monitoring of rail transit and its production process, the structure of the plug-in plate one and the plug-in plate two is equivalent, and the upper and lower ends are designed to be bent, so as to limit the position, effectively avoiding the leakage caused by the fact that the plug-in plate one is driven by the cylinder to move excessively up and down and separated from the two separation seats.

[0035] 8. The special cable for intelligent monitoring of rail transit and its production process, the connecting member is provided, the middle section of the fastening screw is provided with a rotating sleeve, so that the operator can manually tighten without the help of external tools; the fastening screw is a bidirectional screw, after rotating the fastening screw, the two fixed clamps slide relative to the corresponding side frames, so as to realize the stable connection of the two groups of outer cylinders one and two, and indirectly ensure the injection molding quality of the special cable. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0037] Figure 2 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0038] Figure 3 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof. Figure 2 .

[0039] Figure 4 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof. Figure 3 .

[0040] Figure 5 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0041] Figure 6 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0042] Figure 7 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0043] Figure 8 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0044] Figure 9 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0045] Figure 10 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0046] Figure 11 The application discloses a special cable for intelligent monitoring of rail transit and a production process thereof.

[0047] In the drawing:

[0048] 1, special cable; 2, injection molding module;

[0049] 11, cable core; 12, shielding layer; 13, protection layer;

[0050] 21, die holder; 22, front die; 23, rear die; 24, transmission member; 25, connecting member;

[0051] 221, bottom die; 222, ejector pin; 223, front inner die; 224, water-cooled die sleeve; 225, top die;

[0052] 2231, front inner bottom die; 2232, front inner top die; 2233, cavity one; 2234, through slot; 2235, injection port; 2236, spacer one; 2237, insertion slot; 2238, insertion plate one; 2239, outer cylinder one; 2240, adapter;

[0053] 231, rear inner die;

[0054] 2311, rear inner top die; 2312, rear inner bottom die; 2313, cavity two; 2314, outer cylinder two; 2315, insertion adapter; 2316, spacer two; 2317, insertion plate two;

[0055] 241, air cylinder; 242, connecting frame; 243, insertion seat;

[0056] 251, fixed clamp; 252, side frame; 253, fastening screw. DETAILED DESCRIPTION

[0057] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Embodiment one

[0059] In order to solve the problems of the prior art, as shown in Figure 1 The present application provides a special cable for intelligent monitoring of rail transit, a shielding layer 12 is wrapped on the outer wall of the cable core 11, and a protective layer 13 is wrapped on the outer wall of the shielding layer 12.

[0060] The material of the shielding layer 12 is a vinyl acetate copolymer, and the volume resistance of the material is generally 10-100 Ω / cm, which can be used for power cables with a rated voltage greater than 1kv, and completely meets the use requirements of the special cable 1 for intelligent monitoring;

[0061] The cable core 11 can be made of annealed copper or aluminum, which has good electrical conductivity;

[0062] The protective layer 13 is made of silicone rubber, has the characteristics of heat radiation resistance, cold resistance, acid and alkali resistance, corrosion resistance, water resistance, soft structure, convenient laying, stable electrical performance in high temperature and cold environment, outstanding anti-aging performance and long service life.

[0063] The normal melting point of the protective layer 13 is 220 DEG C, and the normal melting point of the shielding layer 12 is 380 DEG C, so that the production requirements of the coating sequence are completely met, and the injection molding module 2 is used for one-time forming, which greatly improves the production efficiency of the special cable 1.

[0064] As shown in Figures 2-4 An intelligent monitoring special cable for 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 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 connecting piece 25, and the two cable cores 11 are sent into the two input ends of the front mold 22, and a conveying mechanism can be used.

[0065] It should be noted that the present application is a kind of intelligent monitoring special cable for rail transit and its production process, by setting the injection molding module 2, before the production of the special cable 1, first assemble the injection molding module 2;

[0066] During the assembly of the injection molding module 2, the operator first places the mold base 21 in a suitable position, as level as possible, to ensure that the front mold 22 and the rear mold 23 are stably connected in the subsequent process, and then places the front mold 22 and the rear mold 23 on the upper end of the mold base 21;

[0067] At the same time, the operator also fixedly connects the transmission member 24 to one side of the upper end of the mold base 21, 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 stably connects the front mold 22 and the rear mold 23 together based on the connecting piece 25;

[0068] During the production of the special cable, the operator can use the conveying mechanism to send the cable core 11 into the front end of the front mold 22, and then inject the ethylene-vinyl acetate copolymer melt into the upper end of the front mold 22, and co-press the front mold 22 on the outer wall of the cable core 11, so that the shielding layer 12 is formed on the outer wall of the cable core 11;

[0069] After the front mold 22 of this batch is completed, the operator then injects the silicone rubber melt into the upper end of the rear mold 23, and co-presses the rear mold 23 on the outer wall of the shielding layer 12, so that the protective layer 13 is formed on the outer wall of the shielding layer 12, and the cable is produced.

[0070] The pressure-out 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 crosslink with the polymer.

[0071] Specifically, and as shown in Figure 5 The lower end of the front mold 22 of the injection mold set 2 for producing the special cable for intelligent monitoring of rail transit and its production process is placed on one side of the upper end of the mold base 21, which can be fixedly connected, and the ejector pin 222 is detachably connected to the inside of the bottom mold 221, and the ejector pins on the ejector pin 222 are all penetrated from the upper end of the inside of the bottom mold 221 to the upper end of the bottom mold 221.

[0072] 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 the upper end of one of the water-cooled mold sleeves 224, and the top mold 225 is inserted into the upper end of the other water-cooled mold sleeve 224.

[0073] It should be noted that the present application is a special cable for intelligent monitoring of rail transit and its production process, which is assembled by the front mold 22 before the production of the special cable 1.

[0074] During the assembly of 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 in the inside of the bottom mold 221.

[0075] After the assembly of the ejector pin 222 is completed, 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 the other water-cooled mold sleeve 224 at the upper end 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-cooled mold sleeve 224.

[0076] The assembly process of the rear mold 23 is the same as the assembly process of the front mold 22 described above.

[0077] During the production of the special cable 1, the two water-cooled mold sleeves 224 should be externally connected to circulating water, the cable core 11 is fed from one end of the front inner mold 223, and the vinyl acetate copolymer melt is injected into the inside of the front inner mold 223 from the upper end of the top mold 225 to realize injection molding, and after the melt is effectively cooled by the two water-cooled mold sleeves 224, the shielding layer 12 on the outer wall of the cable core 11 is formed.

[0078] Among them, the structure of the two water-cooled mold sleeves 224 is designed to be open, so as to cope with the structural characteristics of the front inner mold 223.

[0079] Further, and as shown in Figures 6-8As shown, a kind of special cable for intelligent monitoring of rail transit and its production process injection mold module 2 in front mold 22, rear mold 23 on its front inner mold 223 and rear inner mold 231, front inner top die 2232 is inserted in the upper end of front inner bottom die 2231, and two spacer seat one 2236 is respectively detachably connected to the middle part of front inner top die 2232 and the tail end of cavity one 2233;

[0080] Plugboard one 2238 is based on two slot 2237 and is embedded between two spacer seat one 2236 and front inner top die 2232, front inner bottom die 2231 and is connected with sliding, one end of four outer cylinder one 2239 is respectively welded to the left and right sides of the outer end of two spacer seat one 2236, and four receiving heads 2240 are respectively formed by the outer end of four outer cylinder one 2239;

[0081] The structure connection mode and installation mode of rear inner mold 231 are similar to those of front inner mold 223.

[0082] It should be noted that the present application is a kind of special cable for intelligent monitoring of rail transit and its production process, by setting front inner mold 223 and rear inner mold 231, in the process of injection molding of shielding layer 12 on special cable 1, two cable cores 11 are respectively sent in from two through slots 2234;

[0083] Meanwhile, the vinyl acetate copolymer melt enters the inside of front inner bottom die 2231 and front inner top die 2232 from injection port 2235, flows through two cavities one 2233 to realize the outer wall covering of cable core 11, before this, plugboard one 2238 blocks two spacer seat one 2236 based on slot 2237;

[0084] After shielding layer 12 is cooled, at this time, the operator drives plugboard one 2238 downward by control transmission member 24, so that the through hole on it is communicated with two outer cylinder one 2239 respectively, at this time, cable core 11 can be sent out with shielding layer 12 from two outer cylinder one 2239 to rear inner mold 231;

[0085] After shielding layer 12 is injection molded by front mold 22, cable core 11 is sent into the inside of rear inner top die 2311 and rear inner bottom die 2312 with shielding layer 12, and is located between two cavities two 2313, after the length of cable core 11 is suitable, the principle is the same, silicon rubber melt is injected from the upper end of rear mold 23 to form the outer wall covering of shielding layer 12, before this, two spacer seat two 2316 should be in closed state based on plugboard two 2317;

[0086] After protection layer 13 is cooled and formed, similarly, the operator drives plugboard two 2317 downward by control transmission member 24, so that the two through holes on it are communicated with spacer seat two 2316, and special cable 1 after forming can be sent out.

[0087] Wherein, the former mold 22 and the latter mold 23 are stably docked based on two groups of plug-in connectors 2315 and receiving connectors 2240, and the special cable 1 is integrated with the injection molding production based on the melting point difference of the shielding layer 12 and the protective layer 13 on the special cable 1, so that the production efficiency of the special cable 1 is greatly saved.

[0088] Specifically, and as shown in Figure 9 、 10 A transmission part 24 in an injection molding module 2 for a special cable for intelligent monitoring of rail transit and a production process thereof, the lower end of a cylinder 241 is fixedly connected to the upper end of a mold base 21, and the lower end of the middle part of a connecting frame 242 is detachably fixedly connected to the output end of the cylinder 241, two plug-in seats 243 are respectively formed in the front ends of the two side sections of the connecting frame 242, and the two plug-in seats 243 are respectively sleeved on the outer walls of the plug-in board one 2238 and the plug-in board two 2317.

[0089] It should be noted that the present application is a special cable for intelligent monitoring of rail transit and a production process thereof, by setting the transmission part 24, during the assembly of the injection molding module 2, the operator first fixes the cylinder 241 on the upper end of the mold base 21, then inserts the two plug-in seats 243 on the connecting frame 242 into the outer walls of the plug-in board one 2238 and the plug-in board two 2317 respectively, and fixes the connecting frame 242 to the output end of the cylinder 241.

[0090] During the injection molding of the special cable 1, the operator controls the opening and closing of the cylinder 241 to realize the uplink and downlink control of the plug-in board one 2238 and the plug-in board two 2317.

[0091] Wherein, the transmission part 24 drives the plug-in board one 2238 and the plug-in board two 2317 to move up and down, realizes the relative transformation of the injection molding state and the discharging state of the former mold 22 and the latter mold 23, and makes the plastic and discharging control of the former mold 22 and the latter mold 23 more automatic and more labor-saving.

[0092] The structure of the plug-in board one 2238 and the plug-in board two 2317 is equivalent, and the upper and lower ends are designed to be bent to limit the position, which effectively avoids the material leakage caused by the excessive uplink and downlink of the plug-in board one 2238 driven by the cylinder 241 and separated from the two partition seats one 2236.

[0093] Specifically, and as shown in Figure 11As shown, the connecting piece 25 in the injection molding module 2 for the production process of the special cable for intelligent monitoring of rail transit, four fixed clamps 251 are respectively sleeved on the outer walls of two groups of outer cylinder one 2239 and outer cylinder two 2314 and are detachable, and four side frames 252 are respectively fixedly connected to the different sides of the four fixed clamps 251, and the two sides of the two fastening screws 253 are respectively threadedly connected to the middle sections of the two side frames 252 corresponding thereto.

[0094] It should be noted that the present application is a kind of special cable for intelligent monitoring of rail transit and its production process, by setting the connecting piece 25, in the process of assembling the front mold 22 and the rear mold 23, after the butt joint of the front mold 22 and the rear mold 23 is completed, at this time, the two plug-in connectors 2315 should be respectively inserted into the inner wall of the corresponding receiving head 2240;

[0095] The operator should have fixedly connected the four fixed clamps 251 to the outer walls of the two groups of outer cylinder one 2239 and outer cylinder two 2314 in advance, after the butt joint of the front mold 22 and the rear mold 23 is completed, in order to ensure the butt joint stability of the front mold 22 and the rear mold 23, the operator rotates the two ends of the two fastening screws 253 into the middle sections of the two side frames 252 corresponding thereto and tightens them, so as to realize the butt joint stability of the front mold 22 and the rear mold 23.

[0096] Among them, the middle section of the fastening screw 253 is provided with a rotating sleeve, so that the operator can manually tighten without the aid of external tools; the fastening screw 253 is a bidirectional screw, after rotating the fastening screw 253, the two fixed clamps 251 respectively slide based on the side frames 252 corresponding thereto, so as to realize the butt joint stability of the two groups of outer cylinder one 2239 and outer cylinder two 2314, and indirectly ensure the injection molding quality of the special cable 1.

[0097] The basic principles and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A manufacturing process for a special cable used in intelligent monitoring for rail transit, characterized in that: The special cable (1) comprises a cable core (11) made of annealed copper with high toughness, a shielding layer (12) made of vinyl acetate copolymer with a volume resistance of 10-100 Ω·cm, and a protective layer (13) covering the outer wall of the shielding layer (12); The production process adopts an injection molding module (2) for injection molding of the shielding layer (12) and the protective layer (13) on the special cable (1); The injection molding module (2) comprises 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) for injection molding of the shielding layer (12) and the protective layer (13), respectively, a transmission member (24) is arranged on one side of the upper end of the mold base (21) between the front mold (22) and the rear mold (23) for cooperating with the control of injection and discharge, and a connecting member (25) is arranged between the front mold (22) and the rear mold (23) for stable connection; The front mold (22) comprises a bottom mold (221), and a thimble member (222) is detachably connected to the inside of the bottom mold (221), and the thimbles on the thimble member (222) are all penetrated from the upper end of the inside of the bottom mold (221) to the upper end of the bottom mold (221), a front inner mold (223) for injection molding of the shielding layer (12) is arranged above the bottom mold (221), and water cooling mold sleeves (224) for assisting cooling are arranged at the upper and lower ends of the front inner mold (223), and a top mold (225) is arranged at the upper end of the water cooling mold sleeve (224) above the front inner mold (223); The front inner mold (223) comprises a front inner bottom mold (2231), and a front inner top mold (2232) with a structure matching that of the front inner bottom mold (2231) is arranged at the upper end of the front inner bottom mold (2231), and an injection port (2235) for molten vinyl acetate copolymer to enter is penetrated and arranged from the middle of the top end to the middle of the lower end of the front inner top mold (2232); Opposite sides of the front inner bottom mold (2231) and the front inner top mold (2232) are both provided with a cavity one (2233), input ends of two groups of the cavity one (2233) are both provided with a through groove (2234) matching the structure of the cable core (11), middle portions of tail ends of the front inner bottom mold (2231) and the front inner top mold (2232) are both provided with a partition one (2236), and both sides of one end of the two partition ones (2236) away from the front inner top mold (2232) and the cavity one (2233) are both provided with an outer cylinder one (2239) for guiding material and communicating with the partition one (2236); One end of the two partition ones (2236) near the front inner top mold (2232) and the cavity one (2233) is provided with an insertion slot (2237), and the inner walls of the two insertion slots (2237) are provided with an insertion plate one (2238) for blocking the two partition ones (2236) from the front inner bottom mold (2231) and the front inner top mold (2232); The side view structure of the plug-in plate one (2238) is "L" type, and the left and right sides of the vertical section of the plug-in plate one (2238) are provided with through holes with a size corresponding to the two cavity one (2233), and the four outer barrels one (2239) are respectively provided with a receiving head (2240) connected with the input end of the rear mold (23) away from the corresponding one end of the spacer one (2236); The rear inner mold (231) comprises a rear inner bottom mold (2312) and 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 a cavity two (2313) for protecting the injection of the layer (13), and the other ends of the rear inner top mold (2311) and the rear inner bottom mold (2312) are provided with a spacer two (2316) for discharging and guiding, and the spacer two (2316) is provided with a plug-in plate two (2317) for blocking between them; The left and right sides of the one end of the rear inner top mold (2311) and the rear inner bottom mold (2312) are also provided with an outer barrel two (2314) for guiding material, and the one end of the four outer barrels two (2314) away from the rear inner top mold (2311) and the rear inner bottom mold (2312) is provided with a plug-in head (2315) matched with the structure of the four receiving heads (2240); The transmission part (24) comprises a gas cylinder (241), and the output end of the gas cylinder (241) is provided with a connection frame (242) with a "n" type in plan view, and the front ends of the two side sections of the connection frame (242) are provided with plug-in seats (243) matched with the structures of the plug-in plate one (2238) and the plug-in plate two (2317); The connecting part (25) comprises a fixed clamp (251) matched with the structures of the two groups of outer barrels one (2239) and the outer barrels two (2314), and the different sides of the two groups of fixed clamps (251) are provided with side frames (252), and the two side frames (252) are provided with a fastening screw (253) for adjusting the fastening thereof; The production process of the special cable for intelligent monitoring of rail transit comprises the following steps: S100, mold assembly: the operator first assembles two front molds (22) and rear molds (23), and then places and fixes the front mold (22) and the rear mold (23) together with the transmission part (24) on the upper end of the mold base (21), and at the same time, the output end of the front mold (22) is connected with the input end of the rear mold (23), and in this process, the front mold (22) and the rear mold (23) are connected more stably through the two connecting parts (25); S200, feeding and injection molding: after the injection molding module (2) is assembled, the operator sends two cable cores (11) into the inside of the front inner mold (223) through the two through grooves (2234) by means of the conveying mechanism, and before this, the two plug-in grooves (2237) should be in a closed state based on the plug-in plate one (2238), and then the ethylene-vinyl acetate copolymer melt is injected from the upper end of the front mold (22) to form an injection molding coating. S300, overmolding: after being cooled 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 air cylinder (241) to drive the descending of the first plug-in plate (2238), so that the two through holes on the first plug-in plate (2238) are opposite to the two outer barrels (2239). At this time, under the action of the conveying mechanism, the shielding layer (12) and the cable core (11) are sent into the rear inner mold (231) through the two outer barrels (2239) and based on the two partition seats (2316) to realize overmolding; S301, based on step S300, the overmolding step in the rear inner mold (231) is similar to step S200; wherein the vinyl acetate copolymer melt is replaced by a silicone rubber melt.

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