A graphite coating apparatus

Abstract

The utility model relates to the technical field of graphite coating process, provide a kind of graphite coating equipment, for the suspension formed by mixing graphite powder and water is coated on cable, and graphite coating equipment includes: support platform, it is provided with sealed storage unit, spraying unit and coating unit on it;Sealed storage unit is used to provide suspension;Spraying unit is communicated with sealed storage unit, for spraying suspension to the outer surface of cable;Coating unit has coating piece, and coating piece is equipped with the through-hole for cable to pass, and the inner wall of through-hole is in contact with the outer surface of cable, and coating piece rotates around its own axis, to wipe the wet state coating on the surface of cable.By the above design, effectively avoid the generation and diffusion of graphite dust, not only prevent the inhalation of dust by operating personnel and cause respiratory system health damage, but also significantly reduce the dust explosion risk caused by graphite dust reaching explosive concentration in air, realize clean, safe production environment.

Description

Technical Field

[0001] This utility model belongs to the field of graphite coating technology, and specifically relates to a graphite coating equipment. Background Technology

[0002] After high-voltage cables are laid, it is necessary to check for damage to their outer sheath to prevent circulating currents caused by grounding faults in the metal sheath or armor layer, which could lead to abnormal overheating of the cable. At this time, a temporary conductive layer is often formed on the surface of the outer sheath as a test electrode for withstand voltage testing.

[0003] In engineering practice, graphite coating or semi-conductive polyolefin materials can be selected as the conductive layer depending on the application scenario, performance requirements, and cost. Among them, graphite coating has a simple process and low cost, making it particularly suitable for the field testing needs of large-diameter cables.

[0004] The common method for graphite coating is as follows: the cable is propelled forward at a constant speed by a traction mechanism, passing through a coating box containing graphite powder, so that the graphite powder adheres to the outer surface of the cable; then, the cable passes through a surface treatment mechanism consisting of brushes, cloth strips, etc., to remove loose powder that has not adhered firmly, and to compact and polish the already adhered graphite layer, thereby forming a relatively uniform conductive coating.

[0005] However, this dry powder coating process easily generates a large amount of dust during operation, which not only pollutes the working environment but may also enter the body through the operator's respiratory system, posing a long-term and serious threat to their health. In addition, graphite dust is conductive and flammable, and there is a risk of dust explosion when it reaches a certain concentration in the air; if dust is deposited inside electrical equipment, it may also cause electrical short circuits or insulation failure. Utility Model Content

[0006] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is: to propose a graphite coating device. This device comprises a sealing unit, a spraying unit, and a coating unit set on a support platform. The sealing storage unit provides a graphite suspension, which is then sprayed onto the outer surface of the cable by the spraying unit. The wet coating is then evenly smoothed by a rotating coating component in the coating unit, significantly improving coating quality. Compared to traditional dry powder coating methods, this effectively avoids the generation and diffusion of graphite dust, preventing operators from inhaling dust and causing respiratory health damage. It also significantly reduces the risk of dust explosions caused by graphite dust reaching explosive concentrations in the air, achieving a clean and safe production environment.

[0007] The technical solution adopted by this utility model to solve its technical problem is to propose a graphite coating device for coating a suspension formed by mixing graphite powder and water onto a cable. The graphite coating device includes:

[0008] Support platform;

[0009] A sealed storage unit, disposed on the support platform, is used to store and supply the suspension;

[0010] A spraying unit, which is disposed on the moving path of the cable, is used to spray the suspension onto the outer surface of the cable;

[0011] A coating unit is located to the side of the spraying unit and has a rotatably disposed coating component. The coating component has a through hole extending along the moving direction of the cable. The sprayed cable passes through the through hole, and the inner surface of the through hole contacts the outer surface of the cable, which is used to smooth and evenly distribute the sprayed suspension on the outer circumferential surface of the cable.

[0012] In the graphite coating equipment described above, the coating unit further includes:

[0013] A support base is disposed on the support platform, and a cavity is provided inside the support base, and the coating is disposed inside the cavity;

[0014] A first driving member is disposed outside the support base, and the coating member is connected to the output end of the first driving member for driving the coating member to rotate.

[0015] In the graphite coating equipment described above, the two ends of the cavity are respectively provided with first openings, and the two first openings are respectively aligned with the inlet and outlet of the through hole of the coated part, so as to allow the cable to pass through.

[0016] In the graphite coating equipment described above, the sealed storage unit includes a liquid storage tank, the interior of which has a cavity for containing graphite powder and water.

[0017] In the graphite coating equipment described above, the top of the storage tank is provided with a feeding port, and a sealing cover is hinged to the feeding port. The sealing cover has an open position and a closed position. When it is in the open position, the feeding port is open for adding graphite powder and water into the cavity. When it is in the closed position, the sealing cover closes the feeding port, making the cavity a sealed space.

[0018] In the aforementioned graphite coating apparatus, the sealed storage unit further includes:

[0019] A stirring element, one end of which extends into the cavity and is provided with stirring blades, and the other end extends to the outside of the storage tank;

[0020] The second driving component is fixed to the outside of the liquid storage tank, and its output end is connected to the extended end of the stirring component to drive the stirring component to rotate.

[0021] A sealed bearing housing is embedded in the wall of the liquid storage tank, and the stirring element passes through the sealed bearing housing.

[0022] In the aforementioned graphite coating equipment, the spraying unit includes:

[0023] A spraying component is located on the cable's movement path, and the nozzle of the spraying component faces the outer surface of the cable;

[0024] A conveying component is connected to the liquid storage tank and communicates with the cavity inside the liquid storage tank through a pipe. One end of the spraying component is connected to the conveying component, and the conveying component is used to convey the suspension to the spraying component.

[0025] A collection chamber, located directly below the nozzle of the sprayed component, is used to collect the suspension that is not attached to the cable.

[0026] In the graphite coating equipment described above, the conveying component is a pneumatic diaphragm pump.

[0027] In the graphite coating device described above, the bottom of the collection chamber has a drain port, which is connected to the cavity of the storage tank via a return pipe, for returning the collected suspension to the storage tank.

[0028] In the graphite coating equipment described above, the side wall of the collection chamber is provided with an arc-shaped groove for the cable to pass through, and the inner contour of the arc-shaped groove is adapted to the outer peripheral surface of the cable.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The suspension is provided by a sealed storage unit and sprayed onto the outer surface of the cable by a spraying unit. The wet coating is then evenly smoothed by a rotating coating component in the coating unit, which significantly improves the coating quality. Compared with the traditional dry powder coating method, it effectively avoids the generation and diffusion of graphite dust, which not only prevents operators from inhaling dust and causing respiratory health damage, but also significantly reduces the risk of dust explosion caused by graphite dust reaching explosive concentration in the air, thus achieving a clean and safe production environment.

[0031] (2) The conveying component adopts a pneumatic diaphragm pump, and the second driving component is a pneumatic drive device. Both use compressed air as the power source. Electric components are avoided in the suspension conveying and stirring process, thereby eliminating potential electrical ignition sources, significantly reducing the explosion risk in the graphite dust environment, and improving the intrinsic safety level of the equipment.

[0032] (3) By setting up a collection chamber in the spraying unit and guiding the unattached suspension back to the storage tank through the drain port and return pipe, the suspension can be recycled and reused. Combined with the stirring components in the storage tank, the returned suspension can be re-homogenized and reused for spraying, effectively reducing raw material waste, lowering production costs and waste discharge, and improving resource utilization efficiency. Attached Figure Description

[0033] Figure 1 This is a 3D view of the proposed solution.

[0034] Figure 2 This is the floor plan of this project.

[0035] Figure 3 yes Figure 2 A three-dimensional diagram of AA.

[0036] Figure 4 This is a three-dimensional view of the coated part in this scheme.

[0037] Figure 5 This is a three-dimensional view of the sealed storage unit and the spraying unit of this solution.

[0038] In the diagram, 100 is the support platform; 200 is the sealed storage unit; 210 is the liquid storage tank; 211 is the cavity; 212 is the sealing cover; 220 is the stirring component; 221 is the stirring blade; 230 is the second driving component; 240 is the sealed bearing; 300 is the spraying unit; 310 is the sprayed component; 320 is the conveying component; 330 is the collection bin; 331 is the arc-shaped groove; 340 is the return pipe; 400 is the coating unit; 410 is the coated component; 411 is the through hole; 420 is the support base; and 421 is the cavity. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] like Figures 1 to 5As shown, this solution discloses a graphite coating device for coating a suspension formed by mixing graphite powder and water onto a cable. The graphite coating device includes: a support platform 100; a sealed storage unit 200 disposed on the support platform 100 for storing and providing the suspension; a spraying unit 300 disposed on the moving path of the cable for spraying the suspension onto the outer surface of the cable; and a coating unit 400 located to the side of the spraying unit 300, having a rotatably disposed coating component 410. The coating component 410 has a through hole 411 extending along the moving direction of the cable. The coated cable passes through the through hole 411, and the inner surface of the through hole 411 contacts the outer surface of the cable, for smoothing and evenly distributing the sprayed suspension onto the outer circumferential surface of the cable.

[0042] During operation, the cable is driven by a traction device and passes sequentially through the spraying unit 300 and the coating unit 400. The sealed storage unit 200 supplies a suspension to the spraying unit 300, which sprays the suspension onto the outer surface of the cable. Subsequently, the cable with the wet coating enters the coating unit 400. The cable passes through the through hole 411 of the coating component 410, and the inner surface of the through hole 411 contacts the outer surface of the cable, smoothing the coating and distributing it evenly around the cable.

[0043] During use, graphite powder and water are added to the sealed storage unit 200 and mixed to form a stable suspension. The spraying unit 300 sprays the suspension onto the outer surface of the cable, rather than directly spraying dry graphite powder, thereby effectively suppressing the generation and diffusion of dust during production and achieving clean production.

[0044] By avoiding dry powder handling, this method prevents operators from inhaling graphite dust, reducing its long-term health hazards to the respiratory system. Furthermore, by employing a wet coating process, this solution significantly reduces the risk of dust explosions caused by graphite dust reaching explosive concentrations in the air.

[0045] The coating component 410 is preferably made of a flexible porous material such as a sponge. The inner surface of the through hole 411 in the coating component 410 is in contact with the cable surface, and the wet coating is evenly smoothed during the rotation process, thereby improving the coating quality.

[0046] Furthermore, the coating unit 400 also includes: a support base 420 disposed on the support platform 100, the support base 420 having a cavity 421 inside which the coating component 410 is installed; and a first driving component disposed outside the support base 420, the output end of which is connected to the coating component 410 via a rotating shaft, for driving the coating component 410 to rotate around its own axis. Preferably, the first driving component is a motor.

[0047] More preferably, the cavity 421 has a first opening at each end, and the two first openings are respectively aligned with the inlet and outlet of the through hole 411 in the coating 410, so as to allow the cable to pass through.

[0048] Driven by the first driving component, the coating component 410 continuously rotates around its own axis. The inner surface of the through hole 411 in the coating component 410 dynamically contacts the moving cable surface, enabling continuous and uniform smoothing of the wet graphite coating, significantly improving coating thickness consistency and adhesion uniformity. The first openings at both ends of the support base 420 are precisely aligned with the inlet and outlet of the through hole 411 in the coating component 410, ensuring smooth cable passage. Combined with the semi-enclosed structure of the cavity 421, this effectively limits the splashing of suspended liquid, reducing material waste and environmental pollution. Furthermore, the coating unit 400 adopts a modular design, facilitating the disassembly and replacement of the coating component 410, adapting to the coating needs of cables with different outer diameters, and enhancing the equipment's versatility and maintenance convenience.

[0049] Furthermore, the sealed storage unit 200 includes a liquid storage tank 210, which has a cavity 211 for containing graphite powder and water.

[0050] More preferably, the top of the storage tank 210 is provided with a feeding port, and a sealing cover 212 is hinged to the feeding port. The sealing cover 212 has an unfolded position and a closed position. When it is in the unfolded position, the feeding port is open for adding graphite powder and water into the cavity 211. When it is in the closed position, the sealing cover 212 closes the feeding port, making the cavity 211 a sealed space.

[0051] More preferably, the sealed storage unit 200 further includes: a stirring member 220, one end of which extends into the cavity 211 and is provided with stirring blades 221, and the other end extends to the outside of the storage tank 210; a second driving member 230, fixed to the outside of the storage tank 210, the output end of which is connected to the extended end of the stirring member 220 for driving the stirring member 220 to rotate; and a sealed bearing seat 240, embedded in the tank wall of the storage tank 210, with the stirring member 220 passing through the sealed bearing seat 240 for preventing leakage of the suspension in the cavity 211 while allowing the stirring member 220 to rotate.

[0052] During operation, the sealing cover 212 is first placed in the unfolded position. Graphite powder and water are added to the cavity 211 of the storage tank 210 through the open feeding port at the top of the storage tank 210 according to a preset ratio. After the feeding is completed, the sealing cover 212 is switched to the closed position, so that the cavity 211 forms a sealed space. Then, the second drive unit 230 is started to drive the stirring unit 220 to rotate. The stirring blades 221 fully stir the graphite powder and water until a uniform and stable graphite suspension is formed.

[0053] By incorporating an openable and closable sealing cover 212, operation is facilitated during material feeding, and the cavity 211 remains sealed during mixing and storage, effectively preventing graphite dust escape and moisture evaporation. This significantly improves the working environment, reduces occupational health risks, and avoids electrical or explosion hazards caused by dust accumulation. The mixing component 220 is driven by an external second drive component 230, and a reliable dynamic seal is achieved through a sealed bearing seat 240. This ensures thorough mixing while preventing the second drive component 230 from contacting the liquid, thus improving the safety and service life of the equipment. Preparing and storing the graphite suspension under sealed conditions maintains its concentration and uniformity, providing a consistent coating medium for subsequent spraying processes, thereby improving the uniformity, adhesion, and conductivity of the graphite coating on the cable surface. The overall structure has a high degree of integration, supporting quantitative feeding, automatic mixing, and continuous liquid supply. It is suitable for automated production lines and combines environmental friendliness, reliability, and high efficiency. The second drive component 230 is preferably a pneumatic drive device, which avoids the use of electric sparks generated by an electric motor, thereby eliminating potential electrical ignition sources, reducing the risk of explosion in a graphite dust environment, and improving the safety performance of the equipment.

[0054] Further, the spraying unit 300 includes: a spraying component 310 located on the cable movement path, with the nozzle of the spraying component 310 facing the outer surface of the cable; a conveying component 320 connected to the storage tank 210 and communicating with the cavity 211 inside the storage tank 210 through a pipe, one end of the spraying component 310 being connected to the conveying component 320, the conveying component 320 being used to convey the suspension to the spraying component 310; and a collection chamber 330 located directly below the nozzle of the spraying component 310, used to receive the suspension that is not attached to the cable.

[0055] During operation, the cable is driven by the traction device to the area where the spraying unit 300 is located; the conveying component 320 conveys the graphite suspension that is stirred evenly in the storage tank 210 to the spraying component 310, and the spraying component 310 sprays the suspension onto the outer surface of the cable; the unattached suspension drips off under the action of gravity and is collected by the collection bin 330 below.

[0056] More preferably, the conveying component 320 is a pneumatic diaphragm pump. A pneumatic diaphragm pump is a positive displacement pump that uses compressed air as a power source and conveys liquids through the reciprocating motion of a diaphragm. In the graphite coating equipment of this solution, using a pneumatic diaphragm pump as the conveying component 320 can eliminate electrical ignition sources during the conveying process, reduce the risk of explosion in a graphite dust environment, and reliably convey graphite suspensions containing solid particles.

[0057] More preferably, the bottom of the collection chamber 330 is provided with a drain port, which is connected to the cavity 211 of the storage tank 210 through a return pipe 340, so as to return the collected suspension to the storage tank 210, thereby realizing the recycling and reuse of graphite suspension.

[0058] By collecting and returning the suspension that does not adhere to the cable during the spraying process to the storage tank 210, the graphite suspension is recycled, significantly reducing raw material consumption. This avoids direct discharge of graphite-containing wastewater, reducing environmental pollution risks and alleviating the burden of wastewater treatment. Combined with the agitator 220 within the storage tank 210, the returned suspension can be re-homogenized and reused for spraying, ensuring the stability and consistency of the coating process. The entire system forms a closed-loop cycle, which not only reduces the material and operating costs per unit product but also improves the green manufacturing level and sustainable production capacity of the equipment.

[0059] Furthermore, the side wall of the collection chamber 330 is provided with an arc-shaped groove 331 for the cable to pass through. The inner contour of the arc-shaped groove 331 is adapted to the outer peripheral surface of the cable and aligned with the movement path of the cable.

[0060] By setting an arc-shaped groove 331 on the side wall of the collection chamber 330 that is adapted to the outer circumference of the cable, the smooth movement of the cable into the spraying area is ensured, and mechanical interference between the cable and the collection chamber 330 is effectively avoided, ensuring continuous and stable operation of the equipment. The arc-shaped groove 331 is fitted with the cable surface with a clearance, which significantly reduces the splashing or leakage of suspension from the spraying area to the outside without hindering the movement of the cable, thereby improving material utilization and reducing environmental pollution.

[0061] It should be noted that in this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0063] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A graphite coating device for coating a suspension formed by mixing graphite powder and water onto a cable, characterized in that, The graphite coating equipment includes: Support platform; A sealed storage unit, disposed on the support platform, is used to store and supply the suspension; A spraying unit, which is disposed on the moving path of the cable, is used to spray the suspension onto the outer surface of the cable; A coating unit is located to the side of the spraying unit and has a rotatably disposed coating component. The coating component has a through hole extending along the moving direction of the cable. The sprayed cable passes through the through hole, and the inner surface of the through hole contacts the outer surface of the cable, which is used to smooth and evenly distribute the sprayed suspension on the outer circumferential surface of the cable.

2. The graphite coating equipment as described in claim 1, characterized in that, The coating unit further includes: A support base is disposed on the support platform, and a cavity is provided inside the support base, and the coating is disposed inside the cavity; A first driving element is disposed outside the support base. The output end of the first driving element is connected to the coating element via a rotating shaft and is used to drive the coating element to rotate.

3. The graphite coating equipment as described in claim 2, characterized in that, The cavity has a first opening at each end, and the two first openings are aligned with the inlet and outlet of the through hole of the coating, respectively, so that the cable can pass through.

4. The graphite coating equipment as described in claim 1, characterized in that, The sealed storage unit includes a liquid storage tank, which has a cavity inside for containing graphite powder and water.

5. The graphite coating equipment as described in claim 4, characterized in that, The top of the storage tank is provided with a feeding port, and a sealing cover is hinged to the feeding port. The sealing cover has an open position and a closed position. When it is in the open position, the feeding port is open for adding graphite powder and water into the cavity. When it is in the closed position, the sealing cover closes the feeding port, making the cavity a sealed space.

6. The graphite coating equipment as described in claim 4, characterized in that, The sealed storage unit further includes: A stirring element, one end of which extends into the cavity and is provided with stirring blades, and the other end extends to the outside of the storage tank; The second driving component is fixed to the outside of the liquid storage tank, and its output end is connected to the extended end of the stirring component to drive the stirring component to rotate. A sealed bearing housing is embedded in the wall of the liquid storage tank, and the stirring element passes through the sealed bearing housing.

7. The graphite coating equipment as described in claim 4, characterized in that, The spraying unit includes: A spraying component is located on the cable's movement path, and the nozzle of the spraying component faces the outer surface of the cable; A conveying component is connected to the liquid storage tank and communicates with the cavity inside the liquid storage tank through a pipe. One end of the spraying component is connected to the conveying component, and the conveying component is used to convey the suspension to the spraying component. A collection chamber, located directly below the nozzle of the sprayed component, is used to collect the suspension that is not attached to the cable.

8. The graphite coating equipment as described in claim 7, characterized in that, The conveying component is a pneumatic diaphragm pump.

9. The graphite coating equipment as described in claim 7, characterized in that, The bottom of the collection chamber has a drain port, which is connected to the cavity of the storage tank through a return pipe, for returning the collected suspension to the storage tank.

10. The graphite coating equipment as described in claim 7, characterized in that, The side wall of the collection chamber is provided with an arc-shaped groove for the cable to pass through, and the inner contour of the arc-shaped groove is adapted to the outer peripheral surface of the cable.

Images