Macromolecule one-time forming closed type shielding bridge processing technology and equipment thereof

Abstract

The invention belongs to the technical field of bridge processing, and particularly relates to a processing technology and equipment for a macromolecule one-time formed closed shielding bridge, and the processing technology comprises the following steps: S1, smearing an interface agent on the surface of a to-be-processed bridge for later use after the interface agent is solidified; s2, the bridge coated with the interface agent is fed, the bridge is fed through a feeding traction mechanism and heated, and the interface agent on the surface of the bridge is heated to be softened and firmly combined with the surface of the bridge; s3, the bridge continues to be fed and passes through a shaping injection molding mechanism, and the surface of the bridge is covered with materials through the shaping injection molding mechanism to form a protection layer; s4, cooling the bridge frame by means of a cooling mechanism and forming a solidification layer; s5, drying; and S6, discharging is conducted. The electromagnetic heating principle is utilized to accurately heat the interface agent on the surface of the bridge, so that the interface agent is quickly softened and is firmly combined with the surface of the bridge, deep physical and chemical combination is formed, the bonding strength of a protective layer and a bridge base material is remarkably improved, and the hollowing defect is effectively avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge processing, and in particular relates to a processing technology and equipment for a polymer one-step-molded closed shielding bridge. Background Art

[0002] In the power and communications sectors, enclosed shielded cable trays serve as a crucial carrier for cable laying, and their performance directly impacts system safety and stability. With the widespread use of polymer materials in cable tray manufacturing, ensuring the bond strength between the cable tray's surface protective layer and the base material has become a key industry concern.

[0003] The bridge processing production line generally includes a feeding mechanism, a shaping injection molding mechanism, a cooling mechanism, a drying mechanism and a unloading mechanism. The processing first applies an interface coating on the surface of the bridge substrate, and then enters the shaping injection molding mechanism with the help of the feeding mechanism. The shaping injection molding mechanism includes a mold body. Feed channels for the bridge substrate to pass through are arranged on both sides of the mold body. A co-extrusion flow channel is also arranged inside the mold. The co-extrusion flow channel is matched in shape and connected. The polymer material is put into the twin-screw extruder, and the twin-screw extruder extrudes the material and sends it into the co-extrusion flow channel, covering the surface of the bridge substrate and completing the injection molding; then the bridge substrate covered with the polymer material enters the cooling mechanism, allowing the polymer material on the surface of the bridge to cool and solidify into shape, and then unloaded after drying, and the staff will carry out the whole material.

[0004] However, the traditional bridge processing process generally has the problem of loose bonding between the protective layer and the base material. This poor bonding between the protective layer and the base material will cause defects such as hollowing in the protective layer. There are two main reasons for this: First, during the traditional bridge preparation process, the interface agent only stays on the bridge surface and cannot fully bond with the bridge surface. In other words, the protective layer and the base material are simply physically connected, with poor connection strength; second, the current bridge preparation process has extensive cooling process control. Before the protective layer is completely solidified, the cooling water flow directly impacts the protective layer, which leads to stress concentration during the solidification process of the protective layer, weakening the interfacial bonding strength and causing depressions in the protective layer. Summary of the Invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a closed shielding bridge frame processing technology and equipment for polymer one-time molding, which uses the principle of electromagnetic heating to accurately heat the interface agent on the bridge frame surface, so that the interface agent can be quickly softened and firmly bonded to the bridge frame substrate to form a deep physical and chemical bond, fundamentally solving the problem that the interface agent only stays on the surface in traditional processes, significantly improving the bonding strength between the protective layer and the bridge frame substrate, and effectively avoiding hollowing defects.

[0006] The specific technical solution adopted in the present invention is:

[0007] A polymer one-step molding closed shielding bridge processing technology, the processing technology includes the following steps:

[0008] S1. Apply the interface agent on the surface of the bridge to be processed and wait for the interface agent to solidify before use;

[0009] S2. Place the bridge frame coated with the interface agent at the input end of the feeding traction mechanism. The bridge frame is fed with the aid of the feeding traction mechanism and heated. The interface agent on the bridge frame surface is heated and softened and firmly bonded to the bridge frame surface.

[0010] S3, the bridge continues to feed and passes through the shaping injection molding mechanism, which covers the material on the bridge surface to form a protective layer;

[0011] S4, the bridge continues to feed and passes through the cooling mechanism, and the protective layer is cooled by the cooling mechanism and forms a solidified layer;

[0012] S5, the bridge continues to feed the material for drying;

[0013] S6. Cut the bridge frame after drying.

[0014] The interface agent is ethylene-ethyl acrylate resin.

[0015] The materials in step S3 include, by mass, 8-12 parts of ASA resin, 6-10 parts of perchlorethylene resin, 46-54 parts of polyvinyl chloride resin, 1-3 parts of rutile titanium dioxide, 0.5-1.5 parts of carbon black, 15-20 parts of light calcium carbonate, 0.8-1.2 parts of anti-aging agent, 1.8-2.2 parts of lead stearate, and 1.8-2.2 parts of epoxy soybean oil.

[0016] Preferably, the materials in step S3 include, by mass, 10 parts of ASA resin, 8 parts of perchlorethylene resin, 50 parts of polyvinyl chloride resin, 2 parts of rutile titanium dioxide, 1 part of carbon black, 18 parts of light calcium carbonate, 1 part of anti-aging agent, 2 parts of lead stearate, and 2 parts of epoxy soybean oil.

[0017] A closed shielding bridge processing equipment for polymer one-step molding includes a frame and a loading and traction mechanism, a shaping injection molding mechanism, a cooling mechanism, an induction coil and a unloading traction mechanism arranged on the frame in sequence. An electromagnetic heater is also arranged between the loading and traction mechanism and the shaping injection molding mechanism. The electromagnetic heater is fixed on the frame. The input and output ends of the induction coil are respectively connected to the electromagnetic heater. The bridge passes through the induction coil with the help of the loading and traction mechanism and forms electromagnetic heating. The interface agent on the surface of the bridge is heated and softened with the help of the electromagnetic heater and firmly bonded to the surface of the bridge.

[0018] The cooling mechanism includes a primary cooling device and a deep cooling device. The primary cooling device includes a primary cooling chamber and a cooling fan. The primary cooling chamber is provided with a primary cooling channel for the bridge frame to pass through. The output end of the cooling fan is connected to the primary cooling channel by means of an air duct and forms air cooling for the bridge frame. The deep cooling device includes a deep cooling chamber, a water supply pump and a water suction pump. The deep cooling chamber is provided with a deep cooling channel for the bridge frame to pass through. The output end of the water supply pump is connected to the deep cooling channel by means of a water supply pipe and forms water cooling for the bridge frame. The input end of the water suction pump is connected to the deep cooling channel by means of a water suction pipe and extracts water from the deep cooling channel.

[0019] The cryogenic chamber includes a shell and splicing blocks located inside the shell. The splicing blocks are provided with through grooves that match the shape of the bridge. Multiple groups of splicing blocks are arranged at intervals along the feeding direction of the bridge. The through grooves of the multiple groups of splicing blocks together form a cryogenic channel of the cryogenic chamber. Every two splicing blocks form a group of splicing units. The gap between the two splicing blocks in each group of splicing units forms a water supply gap and is connected to the water supply pipe. The gap between adjacent splicing units forms a return gap and is connected to the water pumping pipe.

[0020] The feed side of the through groove is provided with an inclined recessed portion, and the discharge side of the through groove is provided with an inclined raised portion. The area where the water supply seam is located on the periphery of the deep-cold channel forms an inclined guide channel with the help of the recessed portion and the raised portion. The water flow provided by the water supply pipe impacts the surface of the bridge frame along the inclined direction with the help of the guide channel.

[0021] The shell of the deep cold chamber is formed by buckling a base and a groove-shaped cover plate. The shell and the cover plate are respectively provided with a water supply hole and a return hole. The water supply pipe is connected to the input end of the water supply hole, and the water pumping pipe is connected to the output end of the return hole. The output end of the water supply hole faces the water supply gap, and the input end of the return hole faces the return gap.

[0022] The cryogenic device further comprises a cooling water tank connected between the cryogenic chamber and the induction coil. The bridge passes through the cooling water tank and is cooled by the water in the cooling water tank.

[0023] The loading traction mechanism and the unloading traction mechanism have the same structure. Both the loading traction mechanism and the unloading traction mechanism include two groups of conveying crawlers symmetrically arranged up and down, and a conveying channel for conveying the bridge is left between the belt bodies of the two groups of conveying crawlers.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention utilizes the principle of electromagnetic heating to precisely heat the interface agent on the surface of the bridge, so that the interface agent quickly softens and firmly bonds with the bridge substrate, forming a deep physical and chemical bond. This fundamentally solves the problem that the interface agent only stays on the surface in traditional processes, significantly improves the bonding strength between the protective layer and the bridge substrate, effectively avoids hollowing defects, and eliminates the need for subsequent polishing and finishing, thus achieving a one-time molding process.

[0026] In addition, the bridge frame produced by the processing technology of the present invention has a base material deeply integrated with the protective layer under the action of the interface agent, realizing the integrated molding of the base material and the protective layer, utilizing the shielding performance and bearing capacity of the galvanized steel plate or aluminum plate base material, and combining with the anti-corrosion performance of the polymer material of the protective layer, which has an excellent protective effect on the cables wrapped inside.

[0027] 2. The cooling mechanism in this invention utilizes a combined primary cooling system and a deep cooling system. The primary cooling system uses a cooling fan to pre-cool the bridge, preventing large temperature differences during deep cooling that could lead to stress concentration in the protective layer. The deep cooling system utilizes a water supply pump and a water extraction pump to achieve a water cooling cycle. This layered cooling method ensures uniform cooling of the protective layer during the curing process, reducing the risk of interfacial delamination caused by uneven cooling and improving the structural stability and integrity of the protective layer.

[0028] 3. The interior of the cryogenic chamber of the present invention adopts a structure in which splicing blocks are arranged at intervals to form a "segmented water cooling channel". Since each group of splicing units has a water supply seam and a return seam, each splicing unit forms a separate self-circulating system, which ensures the temperature of the water flow and improves the cooling effect. At the same time, this structure ensures that the water flow is evenly distributed along the bridge feed direction, avoiding surface defects caused by concentrated water flow impacting the protective layer in traditional water cooling devices, thereby ensuring the curing quality of the protective layer.

[0029] 4. The protective layer of the present invention adopts a combination of multiple resins. By adding epoxy soybean oil, the compatibility between polar resins (ASA resin, perchlorethylene resin and polyvinyl chloride resin) can be improved. Combined with the co-extrusion molding process, the physical entanglement of molecular segments of multiple resins is combined with chemical compatibility, and finally the protective layer achieves a multi-dimensional performance balance of weather resistance, chemical resistance, processability and flexibility, avoiding the performance shortcomings of a single resin.

[0030] The fillers are rutile titanium dioxide, carbon black and light calcium carbonate. The conductive network structure of carbon black can assist titanium dioxide to form a "conductive-dielectric" composite shielding system, enhancing the attenuation effect of high-frequency electromagnetic waves, while calcium carbonate provides structural support. The combined effect of the three enables the protective layer to have excellent electromagnetic shielding performance, mechanical strength and dimensional stability.

[0031] Anti-aging agents delay material aging, lead stearate ensures processing stability, epoxy soybean oil improves fluidity and enhances phase compatibility, and the polar groups of ASA resin, the compatibility of epoxy soybean oil and the interface agent of electromagnetic heating penetration form a dual bonding mechanism of chemical bonding and physical anchoring, significantly improving the bonding strength between the protective layer and the bridge substrate.

[0032] This formula gives the protective layer excellent mechanical strength, chemical corrosion resistance and long-term stability. When combined with the equipment process, it further enhances the shielding function and service life of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of the production line;

[0034] Figure 2 It is a structural diagram of the electromagnetic heater section;

[0035] Figure 3 It is a structural diagram of the cooling mechanism section;

[0036] Figure 4 This is a schematic diagram of the structure of the deep cold chamber;

[0037] Figure 5 Schematic diagram of the coordination between the splicing unit and the base;

[0038] Figure 6 is a structural diagram of the base;

[0039] Figure 7 Schematic diagram of the cross-section structure of the deep cold chamber;

[0040] Figure 8 for Figure 7 A magnified schematic diagram of part A;

[0041] In the accompanying drawings, 1. frame, 2. shaping injection molding mechanism, 3. induction coil, 4. electromagnetic heater, 5. induction coil, 6. primary cooling chamber, 7. air duct, 8. deep cooling chamber, 9. water supply pipe, 10. suction pipe, 11. splicing block, 12. through groove, 13. water supply seam, 14. return seam, 15. diversion channel, 16. base, 17. cover plate, 18. water supply hole, 19. return hole, 20. cooling water trough, 21. conveyor belt. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0043] Specific embodiments, such as Figure 1-2 As shown, the present invention provides a closed shielding bridge processing equipment for polymer one-time molding, including a frame 1 and a loading and traction mechanism, a shaping injection molding mechanism 2, a cooling mechanism, an induction coil 3 and a unloading traction mechanism arranged on the frame 1 in sequence, and an electromagnetic heater 4 is also arranged between the loading and traction mechanism and the shaping injection molding mechanism 2. The electromagnetic heater 4 is fixed on the frame 1, and the input and output ends of the induction coil 5 are respectively connected to the electromagnetic heater 4. The bridge passes through the induction coil 5 with the help of the loading and traction mechanism and forms electromagnetic heating. The interface agent on the surface of the bridge is heated and softened with the help of the electromagnetic heater 4 and firmly bonded to the surface of the bridge.

[0044] Currently, the traditional polymer bridge processing process generally suffers from a loose bond between the protective layer and the substrate. This poor bonding between the protective layer and the substrate can lead to defects such as hollowing in the protective layer. The main reason for this is that during the traditional bridge preparation process, the interface agent only remains on the bridge surface and cannot fully and firmly bond with the bridge surface. In other words, the protective layer and the substrate are simply physically connected, resulting in poor connection strength.

[0045] Therefore, the present invention utilizes the principle of electromagnetic heating to precisely heat the interface agent on the surface of the bridge frame, so that the interface agent can be quickly softened and firmly bonded to the surface of the bridge frame, forming a deep physical and chemical bond. This fundamentally solves the problem that the interface agent only stays on the surface in traditional processes, significantly improves the bonding strength between the protective layer and the bridge frame substrate, and effectively avoids defects such as hollowing.

[0046] like Figure 1 and Figure 3 As shown, the cooling mechanism includes a primary cooling device and a deep cooling device. The primary cooling device includes a primary cooling chamber 6 and a cooling fan. The primary cooling chamber 6 is provided with a primary cooling channel for the bridge frame to pass through. The output end of the cooling fan is connected to the primary cooling channel by means of an air duct 7 and forms air cooling for the bridge frame. The deep cooling device includes a deep cooling chamber 8, a water supply pump and a water pump. The deep cooling chamber 8 is provided with a deep cooling channel for the bridge frame to pass through. The output end of the water supply pump is connected to the deep cooling channel by means of a water supply pipe 9 and forms water cooling for the bridge frame. The input end of the water pump is connected to the deep cooling channel by means of a water pumping pipe 10 and extracts water from the deep cooling channel.

[0047] The cooling mechanism in this invention utilizes a combined primary cooling system and a deep cooling system. The primary cooling system uses a cooling fan to pre-cool the bridge, preventing significant temperature differences during deep cooling that could lead to stress concentration in the protective layer. The deep cooling system utilizes a water supply pump and a water extraction pump to achieve a water cooling cycle. This layered cooling method ensures uniform cooling of the protective layer during the curing process, reducing the risk of interfacial delamination caused by uneven cooling and improving the structural stability and integrity of the protective layer.

[0048] like Figure 3-8 As shown, the cryogenic chamber 8 includes a shell and a splicing block 11 located inside the shell. The splicing block 11 is provided with a through groove 12 that matches the shape of the bridge. Multiple groups of splicing blocks 11 are arranged at intervals along the feeding direction of the bridge. The through grooves 12 of multiple groups of splicing blocks 11 together form a cryogenic channel of the cryogenic chamber 8. Every two splicing blocks 11 form a group of splicing units. The gap between the two splicing blocks 11 of each group of splicing units forms a water supply gap 13 and is connected to the water supply pipe 9. The gap between adjacent splicing units forms a return gap 14 and is connected to the water pumping pipe 10.

[0049] In the present invention, the interior of the cryogenic chamber 8 adopts a structure in which splicing blocks 11 are arranged at intervals to form a "segmented water cooling channel". Since each group of splicing units has a water supply seam 13 and a return seam 14, each splicing unit forms a separate self-circulating system, so that the water flow temperature of each splicing unit is maintained at a low temperature, thereby improving the cooling effect. At the same time, this structure makes the water flow evenly distributed along the bridge feed direction, avoiding the surface defects caused by the concentrated impact of water flow on the protective layer in traditional water cooling devices, thereby ensuring the curing quality of the protective layer.

[0050] like Figure 5 and Figure 7-8 As shown, the widths of the splicing blocks 11 are equal. On the one hand, this is to facilitate the processing and manufacturing of the splicing blocks 11, and on the other hand, it plays a role in preventing backflow. Since the first-level water supply seam 13 and the first-level return seam 14 form a self-circulation, and the second-level water supply seam 13 and the second-level return seam 14 form a self-circulation, there is no water flow in the deep cooling channel formed by the splicing block 11 between the first-level return seam 14 and the second-level water supply seam 13, which can avoid the water flow from the second-level water supply seam 13 being sucked back along the first-level return seam 14. In addition, this cascade cooling plays a temperature buffering role.

[0051] like Figure 7-8 As shown, the feed side of the through groove 12 is provided with an inclined recessed portion, and the discharge side of the through groove 12 is provided with an inclined raised portion. The area where the water supply seam 13 is located on the periphery of the deep-cold channel forms an inclined guide channel 15 with the help of the recessed portion and the raised portion. The water flow provided by the water supply pipe 9 impacts the surface of the bridge frame along the inclined direction with the help of the guide channel 15.

[0052] The diversion channel 15 causes the water flow provided by the water supply pipe 9 to impact the bridge surface at an oblique angle. This oblique water flow not only reduces the impact force generated by the vertical impact of the water flow, preventing the protective layer from denting or cracking due to uneven force, but also increases the coverage area of ​​the water flow, avoiding cooling blind spots. In addition, the end of the diversion channel 15 near the deep cooling channel is a trumpet-shaped structure. The end of the diversion channel 15 near the deep cooling channel is wider, which can further reduce the impact force generated by the water flow. While enhancing the cooling effect, the diversion channel 15 protects the surface integrity of the protective layer and improves the appearance quality of the bridge.

[0053] like Figure 4-7 As shown, the shell of the deep freezing chamber 8 is formed by a base 16 and a groove-shaped cover 17, and a water supply hole 18 and a return hole 19 are respectively provided on the shell and the cover 17. The water supply pipe 9 is connected to the input end of the water supply hole 18, and the water extraction pipe 10 is connected to the output end of the return hole 19. The output end of the water supply hole 18 faces the water supply gap 13, and the input end of the return hole 19 faces the return gap 14.

[0054] The housing of the present invention creates a relatively enclosed space within the cryogenic chamber 8. During the pumping process, the water pump creates a localized negative pressure in the cryogenic channel. The tilted diversion channel 15, combined with the negative pressure, allows the water to flow in an orderly, inclined direction, rather than vertically impacting or randomly adsorbing. The kinetic energy of the tilted water flow partially offsets the negative pressure adsorption force, ensuring uniform force on the protective layer surface and avoiding surface defects caused by localized pressure differences. At the same time, the appropriate negative pressure allows the interface agent to further penetrate the substrate, achieving a high bond strength between the protective layer and the substrate.

[0055] like Figure 1 As shown, the structure of the loading traction mechanism is the same as that of the unloading traction mechanism. Both the loading traction mechanism and the unloading traction mechanism include two groups of conveying crawlers 21 symmetrically arranged up and down, and a conveying channel for conveying the bridge is left between the belt bodies of the two groups of conveying crawlers 21.

[0056] The conveying channel between the belt bodies in the present invention can stably clamp the bridge frame, and the symmetrical tracks provide uniform traction to prevent the bridge frame from offsetting or getting stuck during the conveying process; at the same time, it can also adapt to bridge frames with different cross-sectional shapes, and only the spacing between the two sets of conveying tracks 21 needs to be adjusted to improve the versatility of the equipment.

[0057] The drying mechanism 3 may be a belt dryer that performs drying by means of infrared rays or hot air.

[0058] A one-step polymer-molded closed shielding bridge processing technology includes the following steps:

[0059] S1. Apply the interface agent on the surface of the bridge to be processed and wait for the interface agent to solidify before use;

[0060] S2. Place the bridge frame coated with the interface agent at the input end of the feeding traction mechanism. The bridge frame is fed with the aid of the feeding traction mechanism and heated. The interface agent on the bridge frame surface is heated and softened and firmly bonded to the bridge frame surface.

[0061] S3, the bridge continues to feed and passes through the shaping injection molding mechanism, which covers the material on the bridge surface to form a protective layer;

[0062] S4, the bridge continues to feed and passes through the cooling mechanism, and the protective layer is cooled by the cooling mechanism and forms a solidified layer;

[0063] S5, the bridge continues to feed the material for drying;

[0064] S6. Cut the bridge frame after drying.

[0065] The interface agent is ethylene-ethyl acrylate resin.

[0066] The materials in step S3 include, by mass, 8-12 parts of ASA resin, 6-10 parts of perchlorethylene resin, 46-54 parts of polyvinyl chloride resin, 1-3 parts of rutile titanium dioxide, 0.5-1.5 parts of carbon black, 15-20 parts of light calcium carbonate, 0.8-1.2 parts of anti-aging agent, 1.8-2.2 parts of lead stearate, and 1.8-2.2 parts of epoxy soybean oil.

[0067] The protective layer of the present invention adopts a combination of multiple resins. By adding epoxy soybean oil, the compatibility between polar resins (ASA resin, perchlorethylene resin and polyvinyl chloride resin) can be improved. Combined with the co-extrusion molding process, the physical entanglement of molecular segments of the multiple resins is combined with chemical compatibility, and ultimately the protective layer achieves a multi-dimensional performance balance of weather resistance, chemical resistance, processability and flexibility, avoiding the performance shortcomings of a single resin.

[0068] The fillers are rutile titanium dioxide, carbon black and light calcium carbonate. The conductive network structure of carbon black can assist titanium dioxide to form a "conductive-dielectric" composite shielding system, enhancing the attenuation effect of high-frequency electromagnetic waves, while calcium carbonate provides structural support. The combined effect of the three enables the protective layer to have excellent electromagnetic shielding performance, mechanical strength and dimensional stability.

[0069] Anti-aging agents delay material aging, lead stearate ensures processing stability, epoxy soybean oil improves fluidity and enhances phase compatibility, and the polar groups of ASA resin, the compatibility of epoxy soybean oil and the interface agent of electromagnetic heating penetration form a dual bonding mechanism of chemical bonding and physical anchoring, significantly improving the bonding strength between the protective layer and the bridge substrate.

[0070] This formula gives the protective layer excellent mechanical strength, chemical corrosion resistance and long-term stability. When combined with the equipment process, it further enhances the shielding function and service life of the bridge.

Claims

1. A closed shielding bridge processing technology for polymer one-step molding, characterized in that: The processing technology comprises the following steps: S1. Apply the interface agent on the surface of the bridge to be processed and wait for the interface agent to solidify before use; S2. Place the bridge frame coated with the interface agent at the input end of the feeding traction mechanism. The bridge frame is fed with the aid of the feeding traction mechanism and heated. The interface agent on the bridge frame surface is heated and softened and firmly bonded to the bridge frame surface. S3, the bridge continues to be fed and passes through the shaping injection molding mechanism (2), and the shaping injection molding mechanism (2) covers the material on the surface of the bridge to form a protective layer; S4, the bridge continues to feed and passes through the cooling mechanism, and the protective layer is cooled by the cooling mechanism and forms a solidified layer; S5, the bridge continues to feed the material for drying; S6. Cut the bridge frame after drying.

2. A polymer one-step molding closed shielding bridge processing process according to claim 1, characterized in that: The interface agent is ethylene-ethyl acrylate resin.

3. A polymer one-step molding closed shielding bridge processing process according to claim 1, characterized in that: The materials in step S3 include, by mass, 8-12 parts of ASA resin, 6-10 parts of perchlorethylene resin, 46-54 parts of polyvinyl chloride resin, 1-3 parts of rutile titanium dioxide, 0.5-1.5 parts of carbon black, 15-20 parts of light calcium carbonate, 0.8-1.2 parts of anti-aging agent, 1.8-2.2 parts of lead stearate, and 1.8-2.2 parts of epoxy soybean oil.

4. A polymer one-shot molded closed shielding bridge processing equipment, used in the polymer one-shot molded closed shielding bridge processing process as claimed in claim 1, characterized in that: The invention comprises a frame (1) and a feeding traction mechanism, a shaping injection molding mechanism (2), a cooling mechanism, a drying mechanism (3) and a feeding traction mechanism which are sequentially arranged on the frame (1); an electromagnetic heater (4) is further arranged between the feeding traction mechanism and the shaping injection molding mechanism (2); the electromagnetic heater (4) is fixed on the frame (1); the input end and the output end of the induction coil (5) are respectively connected to the electromagnetic heater (4); the bridge passes through the induction coil (5) with the aid of the feeding traction mechanism and forms electromagnetic heating; the interface agent on the surface of the bridge is heated and softened with the aid of the electromagnetic heater (4) and is firmly bonded to the surface of the bridge.

5. A polymer one-step molding closed shielding bridge processing equipment according to claim 4, characterized in that: The cooling mechanism includes a primary cooling device and a deep cooling device. The primary cooling device includes a primary cooling chamber (6) and a cooling fan. The primary cooling chamber (6) is provided with a primary cooling channel for the bridge frame to pass through. The output end of the cooling fan is connected to the primary cooling channel by means of an air duct (7) and forms air cooling for the bridge frame. The deep cooling device includes a deep cooling chamber (8), a water supply pump and a water pump. The deep cooling chamber (8) is provided with a deep cooling channel for the bridge frame to pass through. The output end of the water supply pump is connected to the deep cooling channel by means of a water supply pipe (9) and forms water cooling for the bridge frame. The input end of the water pump is connected to the deep cooling channel by means of a water pumping pipe (10) and extracts water in the deep cooling channel.

6. A polymer one-step molding closed shielding bridge processing equipment according to claim 5, characterized in that: The cryogenic chamber (8) comprises a shell and a splicing block (11) located inside the shell. The splicing block (11) is provided with a through groove (12) that matches the shape of the bridge. Multiple groups of splicing blocks (11) are arranged at intervals along the feeding direction of the bridge. The through grooves (12) of the multiple groups of splicing blocks (11) together form a cryogenic channel of the cryogenic chamber (8). Every two splicing blocks (11) form a group of splicing units. The gap between the two splicing blocks (11) of each group of splicing units forms a water supply gap (13) and is connected to the water supply pipe (9). The gap between adjacent splicing units forms a return gap (14) and is connected to the water extraction pipe (10).

7. A polymer one-step molding closed shielding bridge processing equipment according to claim 6, characterized in that: The feed side of the through groove (12) is provided with an inclined recessed portion, and the discharge side of the through groove (12) is provided with an inclined raised portion. The area of ​​the water supply slot (13) located on the periphery of the deep cooling channel forms an inclined guide channel (15) by means of the recessed portion and the raised portion. The water flow provided by the water supply pipe (9) impacts the bridge surface along the inclined direction by means of the guide channel (15).

8. A polymer one-step molding closed shielding bridge processing equipment according to claim 6, characterized in that: The shell of the deep freezing chamber (8) is formed by fastening a base (16) and a groove-shaped cover plate (17). A water supply hole (18) and a return hole (19) are respectively provided on the shell and the cover plate (17). The water supply pipe (9) is connected to the input end of the water supply hole (18), and the water extraction pipe (10) is connected to the output end of the return hole (19). The output end of the water supply hole (18) faces the water supply slit (13), and the input end of the return hole (19) faces the return slit (14).

9. A polymer one-step molding closed shielding bridge processing equipment according to claim 5, characterized in that: The cryogenic device further comprises a cooling water tank (20), wherein the cooling water tank (20) is connected between the cryogenic chamber (8) and the induction coil (3), and the bridge passes through the cooling water tank (20) and is cooled by the water in the cooling water tank (20).

10. A polymer one-step molding closed shielding bridge processing equipment according to claim 4, characterized in that: The loading and unloading traction mechanisms have the same structure as the unloading traction mechanisms. Both the loading and unloading traction mechanisms include two groups of conveying crawlers (21) symmetrically arranged up and down, and a conveying channel for conveying the bridge is left between the belt bodies of the two groups of conveying crawlers (21).

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