A device for drying passivation fluid for railway through ground wires

Abstract

This invention discloses a drying device for passivation fluid in railway through-ground wires, relating to the field of railway through-ground wire manufacturing technology. It includes a guide head, a connecting pipe, a tee, a drying mold core, and a drying mold sleeve. The drying mold sleeve is fitted onto the drying mold core, forming an annular air cavity between the sleeve and the core. An air-blowing hole is provided on the drying mold core to connect the air cavity to its inner wall. In this invention, high-pressure air is blown into the air cavity through the air inlet, and then the airflow is blown onto the product surface through the horn-shaped air-blowing hole. The passivation fluid on the product surface is blown into the cavity of the PPR pipe, and then flows back to the passivation fluid circulation pool through the tee. The horn-shaped air-blowing hole concentrates the airflow and increases the pressure. The cavity formed by the PPR pipe, PPR tee, guide mold, and drying mold core effectively prevents liquid splashing, keeping the surrounding environment clean.

Description

Technical Field

[0001] This invention relates to the field of railway through ground wire manufacturing technology, specifically to a device for drying passivation liquid for railway through ground wires. Background Technology

[0002] my country's high-speed and conventional railways are equipped with dedicated through grounding wires, which enable equipotential bonding of various equipment on the line, eliminate safety hazards to personnel and equipment caused by potential differences between different devices, and prevent additional interference currents from being generated in signal lines due to potential differences.

[0003] The railway grounding wire is designated as S-DH. Its structure consists of an inner conductor and an outer conductor. The inner conductor is made of stranded soft round copper wire to improve the conductivity of the grounding wire. The outer conductor is made of seamless brass tube that is rolled and tightly wrapped around the inner conductor. The outer conductor not only has good conductivity, but also has resistance to acid and alkali corrosion in various soils. It also has good environmental performance and will not cause pollution to the soil and the surrounding environment.

[0004] To improve the corrosion resistance of railway grounding wire products, the surface of the grounding wire needs to be passivated during the production process. After passivation, the surface needs to be cleaned to remove any residual passivation solution. Since passivation solution can pollute the environment, the water used for cleaning cannot be directly discharged; therefore, a self-circulating water system is used. However, it was found that after cleaning several kilometers, the self-circulating water would contain a large amount of passivation solution and become unusable. This resulted in a large amount of untreated wastewater, and sending it to a specialized recycling department for disposal was costly. Therefore, manufacturers now dry the product surface before cleaning to reduce the amount of wastewater requiring treatment. Summary of the Invention

[0005] The main purpose of this invention is to provide a drying device that can effectively blow away the passivation liquid on the surface of the railway grounding wire, so that the amount of passivation liquid remaining on the product surface before entering the cleaning process is extremely small, thereby reducing the amount of wastewater to be treated and saving costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for drying passivation fluid for railway through ground wires, comprising: a guide head, a connecting pipe, a tee, a drying mold core, and a drying mold sleeve.

[0007] The drying mold sleeve is fitted onto the drying mold core, and an annular air cavity is formed between the drying mold sleeve and the drying mold core. An air blowing hole is opened on the drying mold core to connect the air cavity with the inner wall.

[0008] The tee is connected to the guide head and the drying mold core via a connecting pipe, and the guide head, connecting pipe, drying mold core, and drying mold sleeve are coaxially arranged.

[0009] Preferably, the guide head is made of nylon material, and the inner diameter of the guide head is 3mm larger than the outer diameter of the through ground wire product. This prevents the liquid from being blown out. The guide head and the connecting pipe are connected by threads, which not only ensures a seal but also facilitates disassembly and replacement.

[0010] Preferably, both the connecting pipe and the guide head are PPR pipes. The connecting pipe and the tee are connected by heat fusion to form a sealed recovery chamber. The sealed recovery chamber is connected to the return water pipe of the external passivation liquid circulation pool through the other port of the tee.

[0011] The use of hot-melt connection effectively prevents passivation liquid from splashing or leaking outside, reducing pollution to surrounding equipment and the ground, and ensuring that the passivation liquid is effectively recycled into the circulation tank.

[0012] Preferably, the sealed recovery chamber is connected to the drying mold sleeve via a connecting pipe and a threaded connection, which facilitates disassembly and replacement. The drying mold sleeve is tightened by thread to press the drying mold core between the connecting pipe and the drying mold sleeve, so that the drying mold core, the drying mold sleeve, and the connecting pipe are in close contact, effectively preventing gas leakage and ensuring stable drying gas pressure. At the same time, an annular air cavity is formed between the drying mold sleeve and the drying mold core, which can stabilize the gas pressure and ensure that the gas pressure blown out from multiple air holes is basically equal.

[0013] The drying mold core and drying mold sleeve are made of nylon, and the inner diameter of the drying mold core and drying mold sleeve is 3mm larger than the outer diameter of the railway through ground wire product.

[0014] Preferably, the air hole is a trumpet-shaped air hole, and the wide opening of the air hole is connected to the air chamber. By adopting the trumpet-shaped air hole design, the airflow is concentrated and the pressure is increased, which significantly improves the drying efficiency.

[0015] The angle between the axis of the air blowing hole and the axis of the through ground wire is 25°±2°. The 25°±2° angle allows the airflow ejected from the air blowing hole to flow close to the surface of the ground wire, forming an "air knife" effect through the wall adhesion effect, so as to concentrate the airflow energy on the liquid film peeling rather than diffusion loss. At the same time, combined with the 3mm annular gap, the radial diffusion of the airflow is restricted, and the axial driving force is enhanced.

[0016] Preferably, the end face of the drying mold core near the sealed recycling cavity is set as an open flared mouth, the length between the air blowing hole and the flared mouth is set as L1, the distance between the air blowing hole and the discharge end of the drying mold sleeve is set as L2, and L1 is set to be less than 0.5×L2.

[0017] Preferably, the drying mold core includes a fixed part and a rotating part.

[0018] The protruding ring is provided on the fixing part, and the fixing part is fixedly connected to the drying mold sleeve through the protruding ring.

[0019] The rotating part is rotatably mounted on the inner wall of the fixed part via a sealed bearing. At least two sets of spiral air holes are provided inside the rotating part. The angle between the central axis of the air hole and the central axis of the rotating part is in the range of 25°-35°, and all the air holes rotate in the same direction.

[0020] Preferably, a flow guide skirt is provided at one end of the rotating part near the tee, and a spiral guide groove is provided on the inner wall of the flow guide skirt. The spiral direction of the spiral guide groove is opposite to the spiral direction of the air blowing hole to decompose the centrifugal force and guide the flow. The angle between the central axis of the spiral guide groove and the axis of the drying mold core is in the range of 10°-20°.

[0021] The gas is propelled from right to left; therefore, most of the gas flows to the left. Upon contact with the ground wire product surface, the gas flows along the narrow gap between the ground wire and the inner wall of the drying mold core 4. The length L1 of the gap on the left is much shorter than the length L2 on the right. Therefore, the gas pressure drops faster on the left than on the right. Based on the principle that gas automatically flows towards lower pressure, most of the gas flows to the left, while only a small portion flows to the right. The gas flowing to the left fills the entire gap, thus effectively removing most of the water and preventing it from flowing to the right. Any water that is not completely removed is thoroughly dried by the second drying device.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] In this invention, high-pressure air is blown into the air chamber through the air inlet, and then the airflow is blown onto the product surface through the horn-shaped air outlet. This blows the passivation liquid on the product surface into the cavity of the PPR pipe, and then back into the passivation liquid circulation pool through a three-way device. The horn-shaped air outlet concentrates the airflow and increases the pressure. The cavity formed by the PPR pipe, PPR three-way, guide mold, and drying mold core effectively prevents liquid splashing, keeping the surrounding environment clean. This invention contains no metal and is entirely made of materials resistant to passivation liquid corrosion; therefore, it is unaffected by passivation liquid corrosion. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a passivation fluid drying device for railway through ground wires according to the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a guide head in a passivation fluid drying device for railway through ground wires according to the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of a drying mold core in a passivation liquid drying device for railway through ground wires according to the present invention;

[0027] Figure 4This is a schematic diagram of the drying mold sleeve structure in a passivation liquid drying device for railway through ground wires according to the present invention.

[0028] Figure 5 This is a schematic diagram of the structure connecting multiple drying mechanisms in a passivation liquid drying device for railway through ground wires according to the present invention.

[0029] Figure 6 This is a schematic diagram of another embodiment of the passivation liquid drying device for railway through ground wires according to the present invention.

[0030] In the diagram: 1 guide head, 2 connecting pipe; 3 tee, 301 sealed recovery cavity; 4 drying mold core, 401 air hole, 402 convex ring, 403 fixing part, 404 sealed bearing, 405 rotating part, 406 guide skirt; 5 drying mold sleeve, 501 air inlet, 502 groove; 6 air cavity, 7 return water pipe. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Currently, there are many drying devices used for cable surfaces. These devices primarily remove water from the cable surface. During the drying process, water droplets will splash around the device, but the water will not cause pollution. However, if used to dry passivation fluid on the surface of railway grounding wires, the passivation fluid will also splash around the device, causing serious corrosion and pollution to surrounding equipment and the ground.

[0033] The purpose of this invention is to solve the problem of drying the product surface without causing splashing or corrosion and pollution to surrounding equipment and the ground.

[0034] Because the passivation solution is highly corrosive, the entire drying device cannot contain any metal materials. Therefore, the entire device we designed is composed of materials resistant to passivation solution corrosion.

[0035] Example 1: Please refer to Figures 1-4 The present invention provides a technical solution: a device for drying passivation liquid for railway through ground wire, comprising: a guide head 1, a connecting pipe 2, a tee 3, a drying mold core 4, and a drying mold sleeve 5.

[0036] The drying mold sleeve 5 is fitted on the drying mold core 4, and an annular air cavity 6 is formed between the drying mold sleeve 5 and the drying mold core 4. An air blowing hole 401 is opened on the drying mold core 4 to connect the air cavity 6 with the inner wall.

[0037] The tee 3 is connected to the guide head 1 and the drying mold core 4 via the connecting pipe 2, and the guide head 1, the connecting pipe 2, the drying mold core 4 and the drying mold sleeve 5 are coaxially arranged.

[0038] Preferably, the guide head 1 is made of nylon material, and the inner diameter of the guide head 1 is 3mm larger than the outer diameter of the through ground wire product. This can prevent the liquid from being blown out. The guide head 1 and the connecting pipe 2 are connected by threads, which not only ensures sealing but also facilitates disassembly and replacement.

[0039] Preferably, both the connecting pipe 2 and the guide head 1 are PPR pipes. The connecting pipe 2 and the tee 3 are connected by heat fusion to form a sealed recovery chamber 301. The sealed recovery chamber 301 is connected to the return water pipe 7 of the external passivation liquid circulation pool through the other port of the tee 3.

[0040] The use of hot-melt connection effectively prevents passivation liquid from splashing or leaking outside, reducing pollution to surrounding equipment and the ground, and ensuring that the passivation liquid is effectively recycled into the circulation tank.

[0041] Preferably, the sealed recovery chamber 301 is connected to the drying mold sleeve 5 by a connecting pipe 2 via a thread, so as to facilitate disassembly and replacement.

[0042] A convex ring 402 is provided at one end of the drying mold core 4, and an annular groove 502 is provided on the inner wall of the drying mold sleeve 5. The drying mold core 4 is inserted into the drying mold sleeve 5, and when the drying mold sleeve 5 is connected to the connecting pipe 2 by threads, the convex ring 402 and the annular groove 502 are in close contact, so that the drying mold sleeve 5 presses the drying mold core 4 between the connecting pipe 2 and the drying mold sleeve 5, effectively preventing gas leakage and ensuring stable drying gas pressure. An annular air cavity 6 is formed between the drying mold sleeve 5 and the drying mold core 4. The drying mold sleeve 5 is provided with an air inlet 501 that communicates with the sealed recovery cavity 301, which can stabilize the gas pressure and ensure that the gas pressure blown out by multiple air holes 401 is basically equal.

[0043] The drying mold core 4 and the drying mold sleeve 5 are made of nylon, and the inner diameter of the drying mold core 4 and the drying mold sleeve 5 is 3mm larger than the outer diameter of the railway through ground wire product.

[0044] Preferably, the air hole 401 is a trumpet-shaped air hole, and the wide opening of the air hole 401 is connected to the air chamber 6. By adopting the trumpet-shaped design of the air hole 401, the airflow is concentrated and the pressure is increased, which significantly improves the drying efficiency.

[0045] The angle between the axis of the air blowing hole 401 and the axis of the through ground wire is 25°±2°. The 25°±2° angle allows the airflow ejected from the air blowing hole 401 to flow close to the surface of the ground wire, forming an "air knife" effect through the wall adhesion effect, so as to concentrate the airflow energy on the liquid film peeling rather than diffusion loss. At the same time, combined with the 3mm annular gap, the radial diffusion of the airflow is restricted, and the axial driving force is enhanced.

[0046] Preferably, the end face of the drying mold core 4 near the sealed recycling cavity 301 is set as an open flared mouth, the length between the air blowing hole 401 and the flared mouth is set as L1, the distance between the air blowing hole 401 and the discharge end of the drying mold sleeve 5 is set as L2, and L1 is set to be less than 0.5×L2.

[0047] The gas is propelled from right to left; therefore, most of the gas flows to the left. Upon contact with the ground wire product surface, the gas flows along the narrow gap between the ground wire and the inner wall of the drying mold core 4. The length L1 of the gap on the left is much shorter than the length L2 on the right. Therefore, the gas pressure drops faster on the left than on the right. Based on the principle that gas automatically flows towards lower pressure, most of the gas flows to the left, while only a small portion flows to the right. The gas flowing to the left fills the entire gap, thus effectively removing most of the water and preventing it from flowing to the right. Any water that is not completely removed is thoroughly dried by the second drying device.

[0048] Furthermore, to improve the removal effect of passivation solution on the ground wire surface, we can set up two passivation solution drying sections, as described above. Figure 5 As shown, the two drying sections are connected by a connecting pipe thread. The air pressure in the rear drying section can be increased to remove the stubborn passivation liquid on the ground wire surface.

[0049] Working principle: When using the passivation fluid drying device for railway through ground wires, grooved guide wheels are first installed before and after the drying device. The function of the guide wheels is to center the ground wire product, so that the ground wire product is basically in the middle of the guide head 1. This will prevent the ground wire from having large friction with the guide head 1. The guide head is made of nylon material, which is smooth and wear-resistant. Since the hardness of nylon material is much lower than that of the ground wire product, if slight friction occurs, it will not damage the passivation layer on the surface of the ground wire.

[0050] The direction of travel of the ground wire is from left to right (within) Figure 1 (For example), the air inlet 501 is connected to the air source, and the other end of the tee 3 is connected to the passivation liquid circulation pool through the return water pipe 7.

[0051] Open the air source valve and start the ground wire traction device. The ground wire is pulled through the guide head 1, the sealed recovery chamber 301, the drying mold core 4 and the drying mold sleeve 5 in sequence.

[0052] During this process, the airflow sweeps from right to left against the direction of the ground wire, generating high-speed shear force through the 25° inclined air hole 401, directly stripping the passivation liquid from the surface of the ground wire, avoiding splashing caused by vertical impact. Under the impact of the airflow, the passivation liquid enters the sealed recovery chamber 301, and the chamber space suddenly increases (compared to the narrow gap between the ground wire and the drying mold core 4 before), causing the airflow speed to drop sharply. The droplets settle under the action of gravity, and the increased space can reduce airflow turbulence and promote droplet collision and aggregation.

[0053] The settled liquid flows downward along the inner wall of the connecting pipe 2 in the sealed recovery chamber 301, and flows back to the passivation liquid circulation pool through the interface of the tee 3 and the return water pipe 7.

[0054] High-speed gas ejected from multiple air holes 401 on the blow-drying mold core 4 flows along the ground wire surface. The high-speed gas is distributed in a linear array on the ground wire surface. A certain "dynamic airway dead zone" is formed between adjacent air holes 401. Within the airway dead zone, the impact force of the gas on the ground wire surface is weak. Especially for some passivation liquids, such as those containing chromates / phosphates, the surface tension is high and the viscosity is high, making it difficult for the airflow to peel them off. This results in unsatisfactory cleaning effect of the passivation liquid on the ground wire surface. Therefore, we propose the following solution to solve the above problems.

[0055] Example 2: Refer to Figure 6 As shown, in this embodiment, the drying mold core 4 includes a fixed part 403 and a rotating part 405.

[0056] The protruding ring 402 is disposed on the fixing part 403, and the fixing part 403 is fixedly connected to the drying mold sleeve 5 through the protruding ring 402.

[0057] The rotating part 405 is rotatably mounted on the inner wall of the fixed part 403 via a sealed bearing 404. At least two sets of spiral air holes 401 are provided inside the rotating part 405. The angle between the central axis of the air hole 401 and the central axis of the rotating part 405 is in the range of 25°-35°, and all the air holes 401 have the same direction of rotation.

[0058] When the high-speed, high-pressure airflow flows within the spiral-shaped air-blowing hole 401, the airflow forms a tangential force on the inner wall of the air-blowing hole 401, thereby driving the rotating part 405 to rotate about the fixed part 403, converting the airflow energy into mechanical rotation, breaking through the limitations of traditional static drying. The air-blowing hole 401 rotates around the ground wire, thereby achieving thorough drying of the passivation liquid on the ground wire surface without dead angles, solving the problem of passivation liquid residue. Furthermore, the airflow drives the passivation liquid to rotate synchronously on the ground wire surface, and the centrifugal force can accelerate the detachment of passivation liquid droplets from the ground wire.

[0059] Regarding the design of the helical angle of the air blowing hole, the following scheme can be used as a reference: When a high-pressure airflow, such as 0.6-0.8MPa, passes through air blowing hole 401, it will generate a tangential component force. According to Bernoulli's equation, Ft=ρ×v 2 ×sinθ×A.

[0060] Where: ρ is air density, v is flow velocity, θ is helix angle, and A is pore cross-sectional area.

[0061] Wherein, Ft is the tangential force of the airflow on the mold core, which is the pushing force exerted on the mold core in the tangential direction when the high-pressure airflow passes through the spiral blowing hole 401, due to the spiral angle θ between the airflow direction and the mold core surface.

[0062] When θ=30° and v=120m / s, the tangential force of a single hole is about 0.8N, and the combined force of 8 holes is 6.4N, which can overcome the static friction of the nylon 1010 mold core.

[0063] Preferably, the diameter of the air blowing hole 401 is in the range of 2-3mm, the pitch is 1.2-1.8 times the outer diameter of the ground wire, and the outlet end of the air blowing hole 401 is trumpet-shaped with an flaring angle in the range of 60°-80°.

[0064] Reference Figure 6 As shown, a guide skirt 406 is provided at one end of the rotating part 405 near the tee 3. A spiral guide groove is provided on the inner wall of the guide skirt 406. The spiral direction of the spiral guide groove is opposite to the spiral direction of the air blowing hole 401. The angle between the central axis of the spiral guide groove and the axis of the drying mold core 4 is in the range of 10°-20°.

[0065] The guide skirt 406 forms an annular narrow slit with the ground wire surface. Utilizing the Bernoulli effect, the flow velocity increases and the pressure decreases when the high-speed airflow passes through the narrow slit, forming a negative pressure adsorption zone that pulls the droplets back into the airflow channel. This prevents the passivation liquid from scattering radially due to centrifugal force and ensures that the droplets enter the recovery tee axially.

[0066] In one embodiment, the guide skirt 406 is made of flexible PTFE material, and the inner wall is designed with a spiral guide groove with a 15° inclination angle. The spiral guide groove decomposes the radial centrifugal force into an axial component force, which pushes the droplets to move towards the recovery port. Furthermore, the spiral angle of the spiral guide groove is opposite to the rotation direction of the rotating part 405, forming a reverse shear flow, generating a turbulent mixing effect, enhancing droplet aggregation, and improving the peeling effect between the droplets and the ground wire.

[0067] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for drying passivation fluid in railway through-ground wires, characterized in that, include: Includes a guide head (1), a connecting pipe (2), a tee (3), a drying mold core (4), and a drying mold sleeve (5); Among them, the drying mold sleeve (5) is fitted on the drying mold core (4), and an annular air cavity (6) is formed between the drying mold sleeve (5) and the drying mold core (4). An air hole (401) is opened on the drying mold core (4) to connect the air cavity (6) with the inner wall. The tee (3) is connected to the guide head (1) and the drying mold core (4) through the connecting pipe (2), and the guide head (1), the connecting pipe (2), the drying mold core (4) and the drying mold sleeve (5) are coaxially arranged; Both the connecting pipe (2) and the guide head (1) are PPR pipes. The connecting pipe (2) and the tee (3) are connected by heat fusion to form a sealed recovery chamber (301). The sealed recovery chamber (301) is connected to the return water pipe (7) of the external passivation liquid circulation pool through the other port of the tee (3). The sealed recovery chamber (301) is connected to the drying mold sleeve (5) by a connecting pipe (2) via a thread for easy disassembly and replacement; A convex ring (402) is provided at one end of the drying mold core (4), and an annular groove (502) is provided on the inner wall of the drying mold sleeve (5). The drying mold core (4) is inserted into the drying mold sleeve (5), and when the drying mold sleeve (5) is connected to the connecting pipe (2) by threads, the convex ring (402) and the annular groove (502) are in close contact, so that the drying mold sleeve (5) presses the drying mold core (4) against the connecting pipe (2) and the drying mold sleeve (5). The drying mold core (4) and the drying mold sleeve (5) are made of nylon, and the inner diameter of the drying mold core (4) and the drying mold sleeve (5) is larger than the outer diameter of the railway through ground wire product; The drying mold core (4) includes a fixed part (403) and a rotating part (405); A convex ring (402) is provided on the fixing part (403), and the fixing part (403) is fixedly connected to the drying mold sleeve (5) through the convex ring (402); The rotating part (405) is rotatably mounted on the inner wall of the fixed part (403) via a sealed bearing (404). At least two sets of spiral air holes (401) are provided inside the rotating part (405). The angle between the central axis of the air hole (401) and the central axis of the rotating part (405) is in the range of 25°-35°, and all the air holes (401) have the same direction of rotation. A flow guide skirt (406) is provided at one end of the rotating part (405) near the tee (3). A spiral guide groove is provided on the inner wall of the flow guide skirt (406), and the spiral direction of the spiral guide groove is opposite to the spiral direction of the air blowing hole (401) to decompose the centrifugal force and guide the flow. The angle between the central axis of the spiral guide groove and the axis of the drying mold core (4) is 10°-20°.

2. A device for drying passivation fluid for railway through ground wires according to claim 1, characterized in that: The guide head (1) is made of nylon material, and the inner diameter of the guide head (1) is larger than the outer diameter of the through ground wire product. The guide head (1) and the connecting pipe (2) are connected by threads to facilitate disassembly and replacement.

3. A device for drying passivation fluid for railway through ground wires according to claim 1, characterized in that: The blowing hole (401) is a trumpet-shaped air hole, and the wide opening of the blowing hole (401) is connected to the air chamber (6); The angle between the axis of the air vent (401) and the axis of the through ground wire is 25°±2°.

4. A device for drying passivation fluid for railway through ground wires according to claim 1, characterized in that: The end face of the drying mold core (4) near the sealed recycling cavity (301) is set as an open horn mouth. The length between the air blowing hole (401) and the horn mouth is set as L1, and the distance between the air blowing hole (401) and the discharge end of the drying mold sleeve (5) is set as L2. L1 is set to be less than 0.5×L2.

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