CN210237745U

CN210237745U - Spraying device and hot zinc spraying system applying same

Info

Publication number: CN210237745U
Application number: CN201920688367.5U
Authority: CN
Inventors: Jinzhang Yu; 余金璋; Zhiwei Chen; 陈志伟
Original assignee: Ningbo Dazhi Machine Technology Co ltd
Current assignee: Ningbo Dazhi Machine Technology Co ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-04-03
Anticipated expiration: 2029-05-15

Abstract

The utility model discloses a spraying device, including the spray gun subassembly, the spray gun subassembly is including being used for to spray the spray gun of zinc fog, high-pressure gas conveyor of work piece, carrying the conveyor of spray gun with the high-pressure gas that zinc meltwater and high-pressure gas conveyor carried, its characterized in that: the spraying device further comprises a constant-temperature heating assembly which enables the workpiece in the inner container to be in a high-temperature environment. A hot zinc spraying system using the spraying device is also disclosed. By implementing hot zinc spraying in a high-temperature environment, a hot zinc dipping process is simulated, metallographic phases are mutually dissolved between high-temperature zinc mist and a sprayed workpiece, and the high-temperature zinc mist and the sprayed workpiece are mutually dissolved to form a zinc-iron alloy phase layer, so that the combination state and the corrosion resistance of a zinc layer on the workpiece to be sprayed reach or are equal to the effect of the hot zinc dipping process, and the whole processing process is energy-saving and environment-friendly.

Description

Spraying device and hot zinc spraying system applying same

Technical Field

The utility model relates to a metallurgical field, especially a spraying device to and use hot zinc spraying system who has this spraying device.

Background

The steel member is in various atmospheres (including oceans, industrial cities, fields and mines), immersion with different water qualities (seawater and fresh water) and different erosion environments for a long time, and is corroded to different degrees to lose efficacy. At present, the long-acting protective composite coating is prepared by the common processes of hot zinc spraying, hot galvanizing and the like to protect the steel matrix.

The hot zinc spraying is that high pressure air and pipeline are first used to blow sand onto the surface of workpiece to eliminate rust and scale on the surface of metal, and at the same time the surface is hemp-added to increase the adsorption force of hot sprayed coating, and then the zinc is atomized and sprayed onto the surface of metal at super high speed by using oxygen, acetylene or electric heat source (large workpiece is electrically heated, and medium and small workpieces are electrically heated) through compressed air and special tool (spray gun). The zinc metal has good atmospheric corrosion resistance, and when the zinc is sprayed on a steel member, the zinc can form an anode protection effect on negative potential and steel, so that a steel matrix is protected.

The existing common zinc spraying process comprises the following steps: solution spraying, wire flame spraying, powder flame spraying, high-speed flame spraying, explosion spraying, electric arc spraying, plasma spraying, and the like. The processes have the following common defects: 1) the sprayed workpiece is placed in a normal temperature or low temperature state, an iron-zinc co-melting layer cannot be formed between the spraying layer and the sprayed workpiece, and the corrosion resistance degree cannot reach the hot dipping effect; 2) the zinc-iron alloy phase layer cannot be formed by dissolving the iron-based surface and the zinc spraying layer, zinc ions are not further diffused to the matrix to form mutual dissolution of zinc and iron, the adhesive force is not strong, the spraying layer and a sprayed workpiece cannot be tightly combined, peeling and stripping are easy to occur, the corrosion resistance degree is poor, and the weather resistance cannot meet the requirement of long-term outdoor operation; 3) high cost and cannot be popularized in a large area.

The hot dip galvanizing process is to soak a workpiece in zinc solution with high temperature of 500 ℃, and the surface of an iron base is dissolved by the zinc solution to form a zinc-iron alloy phase layer; the zinc ions in the alloy layer are further diffused to the substrate to form a zinc-iron mutual soluble layer; the surface of the alloy layer is wrapped with a zinc layer. The hot dip galvanizing has a thick and compact pure zinc layer covering the surface of the steel fastener, which can prevent the steel substrate from contacting with any corrosive solution and protect the steel fastener substrate from corrosion. In the general atmosphere, the surface of the hot-dip galvanized zinc layer forms a very thin and compact zinc oxide layer surface. It is difficult to dissolve in water, so it can protect the base body of steel fastener. If zinc oxide and other components in the atmosphere generate insoluble zinc salt, the anti-corrosion effect is more ideal; the alloy layer has a zinc-iron alloy layer, is combined compactly, and has specific corrosion resistance in marine salt spray atmosphere and industrial atmosphere; because the combination is firm, the zinc and the iron are mutually soluble, and the wear resistance is very strong; because zinc has good ductility, the alloy layer of the zinc can be firmly adhered to a steel matrix, so hot galvanizing can be carried out in various forming processes such as cold punching, rolling, wire drawing, bending and the like, and the coating is not damaged; after the steel structural member is subjected to hot dip galvanizing, the method is equivalent to one-time annealing treatment, can effectively improve the mechanical property of a steel matrix, eliminates the stress of the steel member during forming and welding, and is beneficial to turning the steel structural member; the surface of the fastener after hot dip galvanizing is bright and beautiful; the pure zinc layer is the most plastic zinc coating layer in hot dip galvanizing, the property of the pure zinc layer is basically close to that of pure zinc, and the pure zinc layer has good ductility.

However, the hot dip galvanizing process has the disadvantages of high energy consumption and environmental pollution.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is to the problem that above-mentioned prior art exists, provides a spraying device, can make the work piece be in the constant temperature state, improves the anticorrosive effect of coating to energy-conservation, environmental protection.

The second technical problem to be solved by the utility model is to provide a hot zinc spraying system with the above spraying device.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: a spray coating device comprising a spray gun assembly including a spray gun for spraying zinc mist to a workpiece, a high-pressure gas delivery means, and a delivery means for delivering zinc melt and high-pressure gas delivered by the high-pressure gas delivery means to the spray gun, characterized in that: the spraying device further comprises a constant-temperature heating assembly which enables the workpiece in the inner container to be in a high-temperature environment.

In order to facilitate heating of the inner container, the constant temperature heating assembly includes a first heating device, and a first heating pipe heated by the first heating device, the first heating pipe having a portion for heating the inner container around an outer circumference of the inner container.

For avoiding heating pipeline heating temperature too high, and be convenient for keep invariable temperature, first heating pipeline is cavity, first heating pipeline's both ends are connected to first joint respectively, first joint is used for being connected with outside water source.

In order to facilitate the zinc in a molten state to be conveyed to the spray gun assembly, the zinc melt circulating conveying assembly is further included, the zinc melt circulating conveying assembly comprises a second heating device, a second heating pipeline heated by the second heating device and a heating storage tank for storing zinc, the second heating pipeline is provided with a part which is arranged in the heating storage tank and used for heating the zinc so that the zinc is kept in a molten liquid state, and the conveying device of the spray gun assembly is communicated with the heating storage tank in a one-way mode and can enable the zinc melt in the heating storage tank to enter the conveying device.

For avoiding heating pipeline heating temperature too high, and be convenient for keep invariable temperature, second heating pipeline is cavity, the both ends of second heating pipeline extend heating storage case and be connected to the second and connect, the second connects and is used for being connected with outside water source.

In order to further enhance the heat preservation of the inner container, the zinc melt circulating and conveying assembly further comprises a circulating driving device and a zinc melt circulating and conveying pipeline, the zinc melt circulating and conveying pipeline is provided with a part which surrounds the periphery of the inner container and is used for preserving heat, one end of the zinc melt circulating and conveying pipeline is connected to the side wall of the heating storage box and communicated with the inside of the heating storage box, and the other end of the zinc melt circulating and conveying pipeline is connected to the circulating driving device so that the zinc melt circulates in the zinc melt circulating and conveying pipeline and the heating storage box.

Preferably, the circulating driving device comprises a pump body which is communicated with the heating storage tank in a one-way mode and pumps the zinc melt in the heating storage tank into the zinc melt circulating and conveying pipeline.

In order to reduce the heat loss of the inner container, the constant-temperature furnace body further comprises a shell which is arranged at the periphery of the inner container at intervals, and the shell and the inner container are both provided with openings at two ends.

In order to further reduce the heat loss of the inner container, the gas-fired boiler further comprises heat-insulating doors arranged at two openings of the shell, each heat-insulating door comprises an annular cover body and a spray head connected with an external gas source, and the spray heads are arranged on the inner peripheral wall of the cover body.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: a hot zinc spraying system applying the spraying device comprises a feeding operation platform, a pretreatment device, the spraying device, a cooling passivation chamber and a discharging packaging operation platform which are sequentially arranged, and a conveying loop passing through the feeding operation platform, the pretreatment device, the spraying device, the cooling passivation chamber and the discharging packaging operation platform, wherein the workpiece can be arranged on the conveying loop and moves along with the conveying loop.

Compared with the prior art, the utility model has the advantages of: by implementing hot zinc spraying in a high-temperature environment, a hot zinc dipping process is simulated, metallographic phases are mutually dissolved between high-temperature zinc mist and a sprayed workpiece, and the high-temperature zinc mist and the sprayed workpiece are mutually dissolved to form a zinc-iron alloy phase layer, so that the combination state and the corrosion resistance of a zinc layer on the workpiece to be sprayed reach or are equal to the effect of the hot zinc dipping process, and the whole processing process is energy-saving and environment-friendly.

Drawings

Fig. 1 is a schematic diagram of a thermal zinc spray system according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion I of FIG. 1;

fig. 3 is a schematic view of a spraying device according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of a spraying device according to an embodiment of the present invention;

fig. 5 is a schematic partial structural view (hidden partial structure) of a spraying device according to an embodiment of the present invention;

fig. 6 is a schematic view of a spray gun of a spraying device according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Referring to fig. 1 and 2, a hot zinc spraying system includes a feeding station 1, a pretreatment apparatus 2, a spraying apparatus 3, a cooling and passivating chamber 4, a discharge and packaging station 5, a conveying loop 6, a driving apparatus 7, and a workpiece 8. The loading operation platform 1, the pretreatment device 2, the spraying device 3, the cooling passivation chamber 4 and the unloading and packaging operation platform 5 are sequentially arranged, and the workpieces 8 sequentially pass through the devices.

The conveying loop 6 passes through the feeding operation platform 1, the pretreatment device 2, the spraying device 3, the cooling passivation chamber 4 and the discharging and packaging operation platform 5. The conveying loop 6 includes an annular conveying line 61, and an intelligent hanging jig 62 provided on the conveying line 61. Various sensors can be arranged on the conveying line 61 to sense temperature, take out an alarm and the like. The driving device 7 can drive the conveying line 61 to move circularly through a motor and a necessary transmission mechanism, the moving speed of the conveying line 61 is controllable, and the driving and transmission of the conveying line 61 can adopt the prior art. The workpiece 8 is set on the conveying line 61 by the hanging jig 62 and moves with the conveying line 61.

The workpiece 8 to be sprayed is placed on the loading table 1 and can be placed on the conveying loop 6 by manual operation. The pretreatment device 2 adopts a full-automatic and environment-friendly type pretreatment combination device, and can carry out pretreatment such as acid washing, drying, waste liquid recycling, heating, filtering, slag discharging and the like. After zinc spraying is carried out on the workpiece 8 to be sprayed in the spraying device 3, the workpiece enters the cooling passivation chamber 4 to be subjected to the treatment steps of pickling passivation, spray cleaning, air-showering cooling, waste liquid purification and recycling, filtering, deslagging and the like.

Referring to fig. 3 to 6, the coating apparatus 3 includes a constant temperature furnace body 31, a heat insulating door 32, a constant temperature heating unit 33, a zinc melt circulation and transportation unit 34, and a spray gun unit 35, which enable the operating environment of the coating apparatus 3 to be in a constant temperature state, so that the workpiece 8 and the zinc melt during coating are always in a substantially constant temperature environment.

The thermostatic oven body 31 includes a housing 311 and an inner container 312 disposed in the housing 311 at intervals, in this embodiment, the housing 311 is made of ceramic and has a hollow cylindrical shape with two open ends in the axial direction. The liner 312 is a composite liner of ceramic and stainless steel, and is also a hollow cylinder with two axial ends open, the ceramic is made of inorganic non-metal material made of natural or synthetic compound through forming and high-temperature sintering, it has the advantages of high melting point, high hardness, high wear resistance, oxidation resistance, etc., and the liner 312 made of ceramic and stainless steel has enough rigidity and thermal deformation resistance. A temperature sensor can be arranged in the constant temperature furnace body 31 to ensure that the temperature in the furnace of the spraying environment is about 400 ℃ (the zinc melting critical temperature, and the workpiece 8 is not annealed). The outer surface of the shell 311 of the thermostatic oven body 31 may also be provided with a display operation screen 313, preferably a full-automatic control ECU computer operation screen, which can display the spraying state, set parameters, automatic monitoring and the like. The transfer loop 6 passes through the liner 312. A heat insulation layer can be further arranged between the shell 311 and the inner container 312 to reduce the dissipation of heat between the inner container 312 and the shell 311.

The heat-insulating doors 32 are provided at both axial ends of the constant temperature furnace body 31, and in this embodiment, a flame air heat-insulating door is used, which includes an annular cover 321 and nozzles 322, the nozzles 322 are connected to an external gas source through a gas pipe 323 and a valve 324, the nozzles 322 are arranged inside the inner peripheral wall of the cover 321, and a plurality of nozzles 322 are arranged at uniform intervals in the circumferential direction. When the valve 324 is opened to introduce gas, the nozzle 322 radially sprays gas flame air wall inwards, thereby blocking the heat exchange between the inside of the constant temperature furnace body 31 and the outside of the constant temperature furnace body 31 and ensuring that the heat of the constant temperature furnace body 31 is not lost and diffused.

The constant temperature heating unit 33 is used for heating the space in the inner container 312 to about 400 ℃, and includes a first heating device 331 and a first heating pipe 332 connected to the first heating device 331. The first heating pipe 332 is a hollow copper pipe, and the first heating device 331 is connected to an external ac power source to heat the first heating pipe 332. The first heating duct 332 has a spiral portion that surrounds the outer periphery of the inner container 312 of the thermostatic oven body 31. In addition, the two ends of the first heating pipe 332 are adjacently disposed, extend away from the inner container 312 (radially outward), and are respectively connected to the first joints 333, and the first joints 333 are used for connecting with an external water source, so that the external water source can enter the first heating pipe 332 through the first joints 333, and the water in the first heating pipe 332 can be discharged to the external water source through the first joints 333. Because the temperature that the copper pipe heated is higher, exceeds required temperature easily in the in-process of heating, consequently makes water at first heating pipeline 332 inner loop, can play the effect of cooling to first heating pipeline 332. The first heating pipe 332 is further connected with the first heating device 331 through the first joint 333, the first heating pipe 332 is not in fluid communication with the first heating device 331, and the first heating device 331 directly transfers heat to the first heating pipe 332 through the first joint 333. It is of course also possible to precisely control the heating temperature without providing a cooling water circulation, and then the first heating means 331 may be directly connected to the first heating pipe 332.

The zinc melt circulation delivery assembly 34 is used for delivering zinc for spraying in a liquid state, and includes a second heating device 341, a second heating pipe 342 connected to the second heating device 341, a heating reserve tank 343, a circulation driving device 344, and a zinc melt circulation delivery pipe 345. The second heating pipe 342 is a hollow copper pipe, and the second heating unit 341 is connected to an external ac power source so that the second heating pipe 342 is heated. The heating reserve tank 343 is used for storing zinc therein, and the second heating pipe 342 heats the temperature in the heating reserve tank 343 to the zinc melting point temperature, so that the zinc in the heating reserve tank 343 is maintained in a liquid state and is ensured to flow. The second heating pipe 342 also has a spiral portion inside the heating reserve tank 343, and both ends of the spiral portion extend out of the heating reserve tank 343 and are connected to a second joint 346, so that the second joint 346 can be connected to an external water source, so that the external water source can enter the second heating pipe 342 through the second joint 346, and the water in the second heating pipe 342 can be discharged to the external water source through the second joint 346. Because the temperature that the copper pipe heated is higher, surpasses required temperature easily at the in-process of heating, consequently make water at second heating pipeline 342 inner loop, can play the effect of cooling to second heating pipeline 342. It is of course also possible to control the heating temperature precisely without the need for a cooling water circuit. The second heating conduit 342 is also connected to the second heating device 341 through a second joint 346, the second heating conduit 342 and the second heating device 341 are not in fluid communication, and the second heating device 341 directly transfers heat to the second heating conduit 342 through the second joint 346. It is of course also possible to precisely control the heating temperature without providing a cooling water circulation, and in this case, the second heating means 341 may be directly connected to the second heating pipe 342.

The zinc melt circulation duct 345 has a spiral-shaped portion around the outer periphery of the inner container 312, and is located between the inner container 312 and the first heating duct 332. The two ends of the zinc melt circulation delivery pipe 345 are respectively located at the two ends of the inner container 312, extend in the direction away from the inner container 312 (radially outward), one end is connected to the side wall of the heating storage tank 343 and communicated with the inside of the heating storage tank 343, and the other end is connected to the circulation driving device 344. In this embodiment, the circulation driving device 344 is of a pump structure, and includes a driving motor 3441 and a pump body 3442, the pump body 3442 is disposed in the heating storage tank 343 and is in one-way communication with the inside of the heating storage tank 343 (only the zinc melt in the heating storage tank 343 can enter the pump body 3442), the driving motor 3441 is disposed outside the heating storage tank 343, the pump body 3442 is in communication with the other end of the zinc melt circulation delivery pipe 345 and the inside of the heating storage tank 343, and can pump the zinc melt in the heating storage tank 343 into the zinc melt circulation delivery pipe 345 and discharge the zinc melt into the heating storage tank 343 again after circulation. The inner container 312 can be insulated by arranging the zinc melt circulating and conveying pipeline 345.

The spray gun assembly 35 comprises a high-pressure gas conveying device 351, a conveying device 352 and a spray gun 353, wherein the high-pressure gas conveying device 351 is connected to an external high-pressure gas source and is communicated with the conveying device 352, the conveying device 352 can be in a pump structure and is arranged in the heating storage tank 343 and is communicated with the heating storage tank 343 in a one-way mode (only zinc melt in the heating storage tank 343 can enter the conveying device 352), and compressed gas conveyed by the high-pressure gas conveying device 351 and the zinc melt in the heating storage tank 343 can be pumped into the spray gun 353.

The spray gun 353 comprises a plurality of nozzles 3531 extending into the inner container 312, and the nozzles 3531 can bear the high temperature of 800 ℃ and atomize the zinc melt and the compressed gas conveyed by the high-pressure gas conveying device 351 so as to spray the workpiece 8. The nozzles 3531 are uniformly arranged at intervals in the circumferential direction of the inner circumferential wall of the inner container 312, the relative position, the spraying speed and the flow rate of the nozzles are adjustable, and the uniformity of a sprayed layer sprayed on the workpiece 8 can be ensured.

In this embodiment, the first heating unit 331 and the second heating unit 341 are located below the same end of the inner bladder 312, and the circulation driving unit 344 and the high pressure gas delivery unit 351 are located below the same end of the inner bladder 312. The heating device can adopt a common heating device, such as a medium-frequency rapid heating device, a gas heating device, an electric thermocouple and the like.

During processing, all parts in the system are started firstly; then, a workpiece 8 to be sprayed is placed on the feeding operation platform 1 and can be placed on the conveying loop 6 through manual operation, the conveying loop 6 drives the workpiece 8 to be sprayed to pass through the pretreatment device 2, and pretreatment such as acid washing, drying, waste liquid recycling, heating, filtering, deslagging and the like can be carried out; then, the workpiece 8 to be sprayed enters the spraying device 3, the workpiece 8 moves in the inner container 312 along with the conveying loop 6, and is in a relatively closed high-temperature environment with a constant temperature of about 400 ℃, and high-temperature zinc mist is sprayed out by a spray gun 353 of the spray gun assembly 35 (the heating temperature of the zinc melt circulating and conveying assembly 34 can be increased, so that the temperature of the high-temperature zinc mist is about 500 ℃, which is equivalent to the temperature of a zinc melting pool of hot dip zinc); after zinc is sprayed in the spraying device 3, the zinc enters the cooling passivation chamber 4 for pickling passivation, spray cleaning, air cooling, waste liquid purification and recycling, filtering, deslagging and other treatment steps; and finally, unloading the workpiece 8 after the spraying and post-treatment at the unloading and packaging operation table 5 by the conveying loop 6 to finish the whole spraying process.

The utility model discloses a scheme is through implementing hot zinc spraying under high temperature environment to this simulation hot zinc dipping technology, high temperature zinc fog with spout and form the metallography mutually soluble between the work piece, dissolve each other and form zinc, ferroalloy looks layer, make zinc layer binding state, corrosion resistance on the work piece 8 of treating spouting reach or equal hot zinc dipping technology's effect, whole processing technology is energy-conserving, environmental protection moreover.

Claims

1. A spray coating device comprising a spray gun assembly (35), said spray gun assembly (35) comprising a spray gun (353) for spraying zinc mist to a workpiece (8), high-pressure gas delivery means (351), delivery means (352) for delivering zinc melt and high-pressure gas delivered by the high-pressure gas delivery means (351) to the spray gun (353), characterized in that: the spraying device is characterized by further comprising a constant-temperature furnace body (31), wherein the constant-temperature furnace body (31) comprises an inner container (312) used for containing the workpiece (8), and the spraying device further comprises a constant-temperature heating assembly (33) enabling the workpiece (8) in the inner container (312) to be in a high-temperature environment.

2. A spray assembly according to claim 1 wherein: the constant temperature heating assembly (33) comprises a first heating device (331) and a first heating pipeline (332) heated by the first heating device (331), wherein the first heating pipeline (332) is provided with a part which surrounds the periphery of the inner container (312) and heats the inner container (312).

3. A spray assembly according to claim 2 wherein: the first heating pipeline (332) is hollow, two ends of the first heating pipeline (332) are respectively connected to a first joint (333), and the first joint (333) is used for being connected with an external water source.

4. A spray assembly according to claim 1 wherein: the zinc melting liquid circulating and conveying device further comprises a zinc melting liquid circulating and conveying assembly (34), wherein the zinc melting liquid circulating and conveying assembly (34) comprises a second heating device (341), a second heating pipeline (342) heated by the second heating device (341) and a heating storage tank (343) for storing zinc, the second heating pipeline (342) is provided with a part which is arranged in the heating storage tank (343) and is used for heating the zinc to keep the zinc in a melting liquid state, and the conveying device (352) of the spray gun assembly (35) is communicated with the heating storage tank (343) in a one-way mode and can enable the zinc melting liquid in the heating storage tank (343) to enter the conveying device (352).

5. A spray assembly according to claim 4 wherein: the second heating pipeline (342) is hollow, two ends of the second heating pipeline (342) extend out of the heating storage tank (343) to be connected to a second joint (346), and the second joint (346) is used for being connected with an external water source.

6. A spray assembly according to claim 4 wherein: the zinc melt circulating and conveying assembly (34) further comprises a circulating driving device (344) and a zinc melt circulating and conveying pipeline (345), the zinc melt circulating and conveying pipeline (345) is provided with a part which surrounds the periphery of the inner container (312) and is used for preserving heat, one end of the zinc melt circulating and conveying pipeline (345) is connected to the side wall of the heating storage tank (343) and communicated with the inside of the heating storage tank (343), and the other end of the zinc melt circulating and conveying pipeline is connected to the circulating driving device (344) so that zinc melt circulates in the zinc melt circulating and conveying pipeline (345) and the heating storage tank (343).

7. A spray assembly according to claim 6 wherein: the circulating driving device (344) comprises a pump body (3442) which is communicated with the heating storage tank (343) in a one-way mode and pumps the zinc melt in the heating storage tank (343) into a zinc melt circulating and conveying pipeline (345).

8. A spray assembly according to claim 1 wherein: the constant temperature furnace body (31) still includes casing (311) that sets up in inner bag (312) periphery at interval, casing (311) and inner bag (312) all are both ends opening.

9. The spray coating device of claim 8 wherein: the gas burner is characterized by further comprising heat-insulating and heat-insulating doors (32) arranged at two openings of the shell (311), wherein each heat-insulating and heat-insulating door (32) comprises an annular cover body (321) and a spray head (322) connected with an external gas source, and the spray heads (322) are arranged on the inner side of the inner peripheral wall of the cover body (321).

10. A hot zinc spraying system applying the spraying device according to any one of claims 1 to 9, comprising a feeding operation platform (1), a pretreatment device (2), a spraying device, a cooling passivation chamber (4), a discharging packaging operation platform (5) which are arranged in sequence, and a conveying loop (6) passing through the feeding operation platform (1), the pretreatment device (2), the spraying device, the cooling passivation chamber (4) and the discharging packaging operation platform (5), wherein the workpiece (8) can be arranged on the conveying loop (6) and moves along with the conveying loop (6).