阅读说明：本技术 一种真空镀膜补液和稳定金属蒸汽供应量的装置及其方法 (Device and method for supplementing liquid and stabilizing metal steam supply amount in vacuum coating ) 是由 任三兵 樊俊飞 李山青 于 2019-09-23 设计创作，主要内容包括：本发明公开了一种真空镀膜补液和稳定金属蒸汽供应量的装置及其方法,包括补料室,所述补料室通过过渡管连通有蒸发坩埚,所述蒸发坩埚连有镀膜室；所述补料室内设有料仓,所述料仓通过过渡管连通所述蒸发坩埚；所述蒸发坩埚的外侧设有坩埚加热器和红外液位仪,蒸发坩埚的顶部通过蒸汽管道连通有镀膜喷嘴,所述镀膜喷嘴位于所述镀膜室内；所述过渡管外侧设有过渡管加热器,所述镀膜喷嘴外侧设有喷嘴加热器,所述蒸汽管道上还设有阀门,所述阀门上还设有压力检测元件。本发明实现简单有效的能提供金属蒸汽供应装置和方法,并在供应金属蒸汽的过程中同时增加了金属蒸汽的生成量。(The invention discloses a device and a method for vacuum coating liquid supplement and metal vapor supply stabilization, and the device comprises a supplement chamber, wherein the supplement chamber is communicated with an evaporation crucible through a transition pipe, and the evaporation crucible is connected with a coating chamber; a feed bin is arranged in the feed supplementing chamber and is communicated with the evaporation crucible through a transition pipe; a crucible heater and an infrared liquid level meter are arranged on the outer side of the evaporation crucible, the top of the evaporation crucible is communicated with a coating nozzle through a steam pipeline, and the coating nozzle is positioned in the coating chamber; the outer side of the transition pipe is provided with a transition pipe heater, the outer side of the coating nozzle is provided with a nozzle heater, the steam pipeline is further provided with a valve, and the valve is further provided with a pressure detection element. The invention is realized simply and effectively, can provide the metal steam supply device and the method, and simultaneously increases the generation amount of the metal steam in the process of supplying the metal steam.)

1. The utility model provides a device of vacuum coating fluid infusion and stable metal vapour supply volume which characterized in that: the device comprises a material supplementing chamber, wherein the material supplementing chamber is communicated with an evaporation crucible through a transition pipe, and the evaporation crucible is connected with a coating chamber;

a feed bin is arranged in the feed supplementing chamber and is communicated with the evaporation crucible through a transition pipe;

a crucible heater and an infrared liquid level meter are arranged on the outer side of the evaporation crucible, the top of the evaporation crucible is communicated with a coating nozzle through a steam pipeline, and the coating nozzle is positioned in the coating chamber;

a transition pipe heater is arranged on the outer side of the transition pipe, a nozzle heater is arranged on the outer side of the coating nozzle, a valve is further arranged on the steam pipeline, and a pressure detection element is further arranged on the valve;

the lower end part of the transition pipe is connected with a spray head which is positioned in the evaporation crucible, an internal heater is arranged below the spray head, and the internal heater is also arranged in the evaporation crucible.

2. The apparatus according to claim 1, wherein the apparatus comprises: the top of feed supplement room is equipped with feed supplement chamber apron, the top of feed supplement chamber apron is equipped with the loading hopper.

3. The apparatus according to claim 2, wherein the apparatus comprises: the material supplementing chamber is also communicated with a bin vacuum chamber on the outer side, and the coating chamber is also communicated with a coating vacuum chamber on the outer side.

4. The apparatus according to claim 1, wherein the apparatus comprises: the upper segment of transition pipe with the feed bin links to each other, be equipped with the drainage section in the transition pipe upper segment, be equipped with the material loosening device in the drainage section.

5. The apparatus according to claim 4, wherein the apparatus comprises: the drainage section is set to be in a contraction shape.

6. A method for replenishing a solution and stabilizing a supply of metal vapor according to any one of claims 1 to 5, comprising: the method comprises the following steps:

1) before coating, adding metal particles into an evaporation crucible, adding metal particles with large volume into the transition pipe to form a drainage section, so that the inside of the evaporation crucible is in a closed state, and adding the metal particles into a storage bin after the drainage section is formed;

2) closing a valve on the steam pipeline, and respectively evacuating the material supplementing chamber and the film coating chamber to a vacuum state;

3) starting a crucible heater of the evaporation crucible to melt metal particles in the evaporation crucible into liquid metal liquid and evaporate the liquid metal liquid continuously to form metal vapor;

4) when the pressure detection element detects that the pressure in the evaporation crucible reaches the injection pressure, a valve on the steam pipeline is opened;

5) the metal plate strip starts to move, and the coating nozzle sprays metal steam to be continuously deposited on the metal plate strip to form a compact coating;

6) detecting the liquid level of the molten metal in the evaporation crucible in real time through an infrared liquid level meter, starting a transition pipe heater on the outer side of a transition pipe when the liquid level is lower than a lowest set value, vacuumizing a material supplementing chamber, heating the transition pipe, and melting a metal particle drainage section arranged in the transition pipe at high temperature so as to form molten metal to flow into the evaporation crucible;

the molten metal in the transition pipe firstly enters a nozzle at the lower end part of the transition pipe, fine small holes are arranged on the nozzle, fine metal droplets are formed in the process that the molten metal flows out through the small holes on the nozzle, an internal heater is arranged below the nozzle, when the steam pressure in an evaporation crucible is insufficient, the internal heater is started, the metal droplets are directly heated and evaporated in the process of flowing through the internal heater, the metal steam is quickly supplemented into the evaporation crucible, and when the steam pressure in the evaporation crucible is normal, the internal heater is closed, and the liquid supplement is continuously carried out through the metal droplets;

7) when the liquid level detected by the infrared liquid level meter reaches a set value, stopping the transition pipe heater on the outer side of the transition pipe, so that the molten metal in the transition pipe is rapidly solidified, and stopping feeding the evaporating crucible;

8) closing the bin vacuum chamber, opening the cover plate of the feeding material chamber, adding metal particles into the bin through the feeding hopper, and enabling the transition pipe to be free of blockage through the material loosening device.

7. The method for replenishing a liquid and stabilizing a steam supply amount in vacuum coating according to claim 6, wherein: the ratio of the diameter of the metal particles to the inner diameter of the transition pipe is 1: 5-1: 10.

8. the method for replenishing a liquid and stabilizing a steam supply amount in vacuum coating according to claim 6, wherein: the relation between the heater power of the transition pipe and the inner diameter and the wall thickness of the transition pipe is as follows:

the inner diameter of the transition pipe is 20-35 mm, the wall thickness is 5-15 mm, and the power of the transition pipe heater is set to be 3-10 KW;

the inner diameter of the transition pipe is 35-50 mm, the wall thickness is 5-15 mm, and the power of the transition pipe heater is set to be 10-20 KW;

the inner diameter of the transition pipe is 50-75 mm, the wall thickness is 5-20 mm, and the power of the transition pipe heater is set to be 20-30 KW;

the inner diameter of the transition pipe is 75-100 mm, the wall thickness is 5-20 mm, and the power of the transition pipe heater is set to be 30-50 KW.

9. The method of claim 8, wherein the vapor replenishment and the steam supply are stabilized by the method of: the volume ratio of the transition tube with the inner diameter of 100mm to the evaporation crucible is set as follows:

when the liquid supplementing time is less than or equal to 5min, the volume ratio of the transition tube to the evaporation crucible is 1: 20-1: 30, of a nitrogen-containing gas;

when the liquid supplementing time is less than or equal to 20min and is less than or equal to 5min, the volume ratio of the transition tube to the evaporation crucible is 1: 30-1: 40.

10. the method for replenishing a liquid and stabilizing a steam supply amount in vacuum coating according to claim 6, wherein: pressure P in the feed supplement chamber_{Supplement device}With the pressure P in said evaporation crucible_{Steaming food}The relationship between them is as follows:

when the liquid level in the evaporation crucible is lower than the normal liquid level of 1/3, P_{Supplement device}≥50P_{Steaming food}；

When the liquid level in the evaporation crucible is lower than the normal liquid level of 1/4, P_{Supplement device}≥200P_{Steaming food}；

When the liquid level in the evaporation crucible is lower than the normal liquid level of 1/5, P_{Supplement device}≥500P_{Steaming food}。

11. The method for replenishing a liquid and stabilizing a steam supply amount in vacuum coating according to claim 6, wherein: the power P of the crucible heater and the pressure P in the evaporation crucible_{Steaming food}The relationship between them is as follows:

when the pressure P in the evaporation crucible is_{Steaming food}When the pressure is lower than the normal pressure of 1/3, P is more than or equal to 1.2P_{Steaming food}；

When evaporating in the cruciblePressure P_{Steaming food}When the pressure is lower than the normal pressure of 1/4, P is more than or equal to 1.5P_{Steaming food}；

When the pressure P in the evaporation crucible is_{Steaming food}When the pressure is lower than the normal pressure of 1/5, P is more than or equal to 2P_{Steaming food}。

Technical Field

The invention relates to the technical field of vacuum coating, in particular to a device and a method for supplementing liquid and stabilizing metal steam supply amount in vacuum coating.

Background

Physical Vapor Deposition (PVD) refers to a process technique in which a metal to be plated is heated under vacuum conditions and deposited in a gaseous state onto a substrate to form a plated film. The heating methods are classified into electric heating (resistive or inductive), electron beam gun heating (EBPVD), and the like. Vacuum coating is widely applied to the industries of electronics, glass, plastics and the like as a surface modification and coating process, and the main advantages of the vacuum coating technology are environmental protection, good coating performance and diversity of coatable substances. The key of the vacuum coating technology applied to the continuous strip steel lies in several aspects of continuous coating production, large-area, high-speed, large-scale production and the like, and from the eighties of the last century, a great deal of research is carried out on the technology by all major steel companies in the world, and with the maturity of hot galvanizing and electrogalvanizing technologies, the technology is paid unprecedented attention and is artificially an innovative surface coating technology.

In a large-scale vacuum coating process, what is important to be involved under certain process conditions is how to realize continuous operation of a spraying process, and the volume and the space in an evaporation crucible are limited in the spraying process, so that when a large flow is consumed in the spraying process, on one hand, the liquid level is reduced to cause instability of subsequent operation, and on the other hand, accidents such as over-burning of the evaporation crucible and the like are easily caused due to exhaustion of zinc materials in extreme cases.

In the prior patent application, a method of coating a substrate and a vacuum deposition apparatus for metal alloys by means of which a metal alloy containing at least two elements is continuously deposited on the substrate, as disclosed in CN 101680080A, comprises a vapor jet coating device which makes it possible to jet onto the substrate a vapor containing these metal elements in a predetermined and constant relative proportion, said vapor having previously reached the speed of sound. The evaporation plant is constituted by an evaporation crucible equipped with a heating device, and the feeding device, which feeds the molten metal alloy of controlled composition to the evaporation crucible, comprises a recharging furnace connected to the ingot feeding device and equipped with a heating system, said recharging furnace being connected to the evaporation crucible it feeds. Wherein the recharging furnace and the evaporation crucible are placed side by side and penetrate the common wall at least by one opening located below the level of the metal alloy bath and above the bottom of the furnace and crucible.

As shown in fig. 1, the automatic feeding device of industrial metal vapor generator disclosed in CN 10332868B relates to a continuous vacuum deposition apparatus for metal coating on a running substrate, the apparatus comprising: vacuum deposition of the casing 1; at least one sonic steam-jet coating head 2, 3, the coating head 2, 3 being connected to an evaporation crucible 6 via a steam supply line 5 provided with a distribution valve 4, the evaporation crucible 6 being intended to receive a coating metal in the form of a liquid 7; and a furnace 8 for said metal, said furnace 8 being at atmospheric pressure, being located below the lowest part of the evaporation crucible 6 and being connected to the evaporation crucible 6 by at least one feed duct 10 of the evaporation crucible 6, provided with a feed pump 9, and by at least one return duct 13, 14 for returning the liquid metal, optionally provided with a valve 11, 12.

As shown in fig. 2, CN 101855380B discloses an industrial steam generator for depositing an alloy coating on a metal strip, relating to a steam generator for depositing a metal coating on a substrate 15, preferably a steel strip, including a vacuum chamber 16, said vacuum chamber 16 being in the form of an enclosure and containing a vapour deposition head called an ejector 17, said injector 17 is in sealed communication with at least one crucible 19 by means of a supply duct 18, the crucible 19 contains the coated metal in liquid form and is located outside the vacuum chamber 16, characterized in that the ejector 17 comprises a longitudinal slot of the steam outlet, which slot acts as a sound frequency and extends over the entire substrate width, and that a pressure structure 20 of sintered material or a filter medium is arranged in the ejector 17 on the steam channel immediately before the slot in order to homogenize the steam flowing out of the ejector 17 by the sound frequency.

In the patent application, the embodiment is given for the adding mode of the zinc material, and the schemes have long pipelines, need to consume a large amount of refractory materials and consume a large amount of energy in the process of insulating the pipelines; some devices also need excessive vacuum protection in the implementation process, are bulky, are not beneficial to maintenance and increase the maintenance cost.

Disclosure of Invention

In view of the above-mentioned defects in the prior art, the present invention provides a device and method for supplying a vacuum coating solution and stabilizing the amount of metal vapor, which can provide a simple and effective device and method for supplying metal vapor and increase the amount of metal vapor generated during the process of supplying metal vapor.

In order to achieve the purpose, the invention adopts the following technical scheme:

on one hand, the device for supplementing liquid and stabilizing the supply amount of metal vapor in vacuum coating comprises a supplement chamber, wherein the supplement chamber is communicated with an evaporation crucible through a transition pipe, and the evaporation crucible is connected with a coating chamber;

a feed bin is arranged in the feed supplementing chamber and is communicated with the evaporation crucible through a transition pipe;

a crucible heater and an infrared liquid level meter are arranged on the outer side of the evaporation crucible, the top of the evaporation crucible is communicated with a coating nozzle through a steam pipeline, and the coating nozzle is positioned in the coating chamber;

the outer side of the transition pipe is provided with a transition pipe heater, the outer side of the coating nozzle is provided with a nozzle heater, the steam pipeline is further provided with a valve, and the valve is further provided with a pressure detection element.

The top of feed supplement room is equipped with feed supplement chamber apron, the top of feed supplement chamber apron is equipped with the loading hopper.

The material supplementing chamber is also communicated with a bin vacuum chamber on the outer side, and the coating chamber is also communicated with a coating vacuum chamber on the outer side.

The upper segment of transition pipe with the feed bin links to each other, be equipped with the drainage section in the transition pipe upper segment, be equipped with the material loosening device in the drainage section.

The drainage section is set to be in a contraction shape.

The lower end part of the transition pipe is connected with a spray head, the spray head is positioned in the evaporation crucible, and an internal heater is arranged below the spray head.

In another aspect, a method for replenishing a liquid and stabilizing a supply amount of metal vapor for vacuum plating includes the steps of:

1) before coating, adding metal particles into an evaporation crucible, adding metal particles with large volume into the transition pipe to form a drainage section, so that the inside of the evaporation crucible is in a closed state, and adding the metal particles into a storage bin after the drainage section is formed;

2) closing a valve on the steam pipeline, and respectively evacuating the material supplementing chamber and the film coating chamber to a vacuum state;

3) starting a crucible heater of the evaporation crucible to melt metal particles in the evaporation crucible into liquid metal liquid and evaporate the liquid metal liquid continuously to form metal vapor;

4) when the pressure detection element detects that the pressure in the evaporation crucible reaches the injection pressure, a valve on the steam pipeline is opened;

5) the metal plate strip starts to move, and the coating nozzle sprays metal steam to be continuously deposited on the metal plate strip to form a compact coating;

6) detecting the liquid level of the molten metal in the evaporation crucible in real time through an infrared liquid level meter, starting a transition pipe heater on the outer side of a transition pipe when the liquid level is lower than a lowest set value, vacuumizing a material supplementing chamber, heating the transition pipe, and melting a metal particle drainage section arranged in the transition pipe at high temperature so as to form molten metal to flow into the evaporation crucible;

7) when the liquid level detected by the infrared liquid level meter reaches a set value, stopping the transition pipe heater on the outer side of the transition pipe, so that the molten metal in the transition pipe is rapidly solidified, and stopping feeding the evaporating crucible;

8) closing the bin vacuum chamber, opening the cover plate of the feeding material chamber, adding metal particles into the bin through the feeding hopper, and enabling the transition pipe to be free of blockage through the material loosening device.

The ratio of the diameter of the metal particles to the inner diameter of the transition pipe is 1: 5-1: 10.

the relation between the heater power of the transition pipe and the inner diameter and the wall thickness of the transition pipe is as follows:

the inner diameter of the transition pipe is 20-35 mm, the wall thickness is 5-15 mm, and the power of the transition pipe heater is set to be 3-10 KW;

the inner diameter of the transition pipe is 35-50 mm, the wall thickness is 5-15 mm, and the power of the transition pipe heater is set to be 10-20 KW;

the inner diameter of the transition pipe is 50-75 mm, the wall thickness is 5-20 mm, and the power of the transition pipe heater is set to be 20-30 KW;

the inner diameter of the transition pipe is 75-100 mm, the wall thickness is 5-20 mm, and the power of the transition pipe heater is set to be 30-50 KW.

The volume ratio of the transition tube with the inner diameter of 100mm to the evaporation crucible is set as follows:

when the liquid supplementing time is less than or equal to 5min, the volume ratio of the transition tube to the evaporation crucible is 1: 20-1: 30, of a nitrogen-containing gas;

when the liquid supplementing time is less than or equal to 20min and is less than or equal to 5min, the volume ratio of the transition tube to the evaporation crucible is 1: 30-1: 40.

pressure P in the feed supplement chamber_{Supplement device}With the pressure P in said evaporation crucible_{Steaming food}The relationship between them is as follows:

when the liquid level in the evaporation crucible is lower than the normal liquid level of 1/3, P_{Supplement device}≥50P_{Steaming food}；

When the liquid level in the evaporation crucible is lower than the normal liquid level of 1/4, P_{Supplement device}≥200P_{Steaming food}；

When the liquid level in the evaporation crucible is lower than the normal liquid level of 1/5, P_{Supplement device}≥500P_{Steaming food}。

The power P of the crucible heater and the pressure P in the evaporation crucible_{Steaming food}The relationship between them is as follows:

when the pressure P in the evaporation crucible is_{Steaming food}When the pressure is lower than the normal pressure of 1/3, P is more than or equal to 1.2P_{Steaming food}；

When the pressure P in the evaporation crucible is_{Steaming food}When the pressure is lower than the normal pressure of 1/4, P is more than or equal to 1.5P_{Steaming food}；

When the pressure P in the evaporation crucible is_{Steaming food}When the pressure is lower than the normal pressure of 1/5, P is more than or equal to 2P_{Steaming food}。

The molten metal in the transition pipe firstly enters a nozzle at the lower end part of the transition pipe, fine small holes are arranged on the nozzle, fine metal droplets are formed in the process that the molten metal flows out through the small holes in the nozzle, an internal heater is arranged below the nozzle, when the steam pressure in the evaporation crucible is insufficient, the internal heater is started, the metal droplets are directly heated and evaporated in the process that the metal droplets flow through the internal heater, the metal steam is quickly supplemented into the evaporation crucible, and when the steam pressure in the evaporation crucible is normal, the internal heater is closed, and the liquid supplement is continuously carried out through the metal droplets.

The invention provides a device and a method for supplementing liquid and stabilizing steam supply amount in vacuum coating, wherein a metal material is arranged in an independent storage bin which is arranged in an independent vacuum chamber, the storage bin is connected with an evaporation crucible through a transition pipe, the evaporation crucible is connected with a coating nozzle and is positioned in the vacuum chamber, and a moving metal belt passing through the vacuum chamber is coated. The outer side of the transition pipe realizes the heating and cooling effects on the pipeline through the heating controller, thereby realizing the control of feeding and stopping. When the transition pipe supplies materials for the evaporation crucible, a spraying method is adopted, and an internal heating device is added in the crucible, so that metal liquid drops are heated by the high-temperature pipe in the falling process to quickly form steam which is supplemented to the coating nozzle.

Drawings

FIG. 1 is a schematic view of patent CN 10332868B;

FIG. 2 is a schematic view of patent CN 101855380B;

FIG. 3 is a schematic view of the structure of the apparatus for replenishing the liquid and stabilizing the steam supply amount in the vacuum coating of the present invention.

Detailed Description

The technical scheme of the invention is further explained by combining the drawings and the embodiment.

Referring to fig. 3, the device for supplying liquid and stabilizing steam for vacuum coating provided by the present invention comprises a supply chamber 21, wherein the supply chamber 21 is communicated with an evaporation crucible 23 through a transition pipe 22, and the evaporation crucible 23 is connected with a coating chamber 24.

Preferably, a storage bin 25 is arranged in the feeding chamber 21, the storage bin 25 is communicated with the evaporation crucible 23 through a transition pipe 22, the feeding chamber 21 is communicated with an outer storage bin vacuum chamber 26, a feeding chamber cover plate 27 is arranged at the top of the feeding chamber 21, and a feeding hopper 28 is arranged above the feeding chamber cover plate 27. The silo 25 can be filled by opening the feed chamber cover 27 and filling from the hopper 28 under atmospheric conditions. The transition duct 22 is now isolated from gas communication with the main duct by the addition of a flow-diverting section 31 in its interior.

Preferably, a transition tube heater 29 is disposed outside the transition tube 22 for controlling the temperature of the transition tube 22 and the metal particles 30 therein. The transition duct heater 29 allows for a stepwise and time-shared control of the heating power to achieve different temperature effects on the transition duct 22. The upper section of the transition pipe 22 is connected with the stock bin 25, a drainage section 31 is arranged in the upper section of the transition pipe 22, and a material loosening device 32 is arranged in the drainage section 31. The tripper 32 is used to feed the ordered fall of the metal particles 30 inside the transition duct 22.

Preferably, a crucible heater 33 and an infrared liquid level meter 34 are arranged on the outer side of the evaporation crucible 23, the top of the evaporation crucible 23 is communicated with a coating nozzle 36 through a steam pipeline 35, the coating nozzle 36 is positioned in the coating chamber 24, and the coating chamber 24 is further communicated with a coating vacuum chamber 43 on the outer side. A nozzle heater 37 is arranged outside the coating nozzle 36, a valve 38 is further arranged on the steam pipeline 35, and a pressure detection element is further arranged on the valve 38. Before the coating begins, the valve 38 on the steam pipeline 35 is closed, and the drainage section 31 of the transition pipe 22 is blocked, so that the evaporation crucible 23 is isolated from the outside atmosphere. After the crucible heater 33 is activated, the pressure of the metal vapor 39 in the vapor pipe 35 can be controlled by adjusting the power thereof.

Preferably, the lower end of the transition pipe 22 is connected with a nozzle 40, the nozzle 40 is located in the evaporation crucible 23, and an internal heater 41 is arranged below the nozzle 40.

Preferably, the coating chamber 24 is internally provided with a coating nozzle 36 and a movable metal plate strip 42, the nozzle heater 37 realizes the control of the temperature of the coating nozzle 36, and the metal plate strip 42 realizes the isolation of indoor and outdoor air through movable sealing at the outer side of the coating vacuum chamber 43. The flow of metal vapor 39 to the coating nozzle 36 is controlled by a valve 38 in the vapor line 35.

The invention also discloses a method for vacuum coating liquid supplementing and steam supply stabilizing, which comprises the following steps:

1) before the start of the coating, metal particles are added to the evaporation crucible 23, the volume of the metal particles being in a certain proportion to the volume of the evaporation crucible 23. Adding metal particles with large volume in the transition pipe 22, adding a drainage section 31 to enable the inside of the evaporation crucible 23 to be in a closed state, and adding the metal particles 30 in a storage bin 25 after the drainage section 31 is formed;

2) closing a valve 38 on the steam pipeline 35, and respectively evacuating the material supplementing chamber 21 and the film coating chamber 24 to a vacuum state;

3) starting the crucible heater 33 of the evaporation crucible 23, so that the metal particles in the evaporation crucible 23 are melted into liquid metal liquid 44 and are continuously evaporated to form metal vapor 39;

4) when the pressure detecting element detects that the pressure in the evaporation crucible 23 reaches the injection pressure, the valve 38 on the steam pipe 35 is opened;

5) the metal plate strip 42 starts to move, and the coating nozzle 36 sprays metal steam 39 to be continuously deposited on the metal plate strip 42 to form a compact coating 45;

6) detecting the liquid level of the molten metal 44 in the evaporation crucible 23 in real time through the infrared liquid level meter 34, when the liquid level is lower than the lowest set value, starting the transition pipe heater 29 outside the transition pipe 22, vacuumizing the feeding chamber 21, heating the transition pipe 22, and melting the metal particle drainage section 31 arranged in the transition pipe 22 at a high temperature so as to form molten metal to flow into the evaporation crucible 23;

in the above process, the molten metal in the transition tube 22 firstly enters the nozzle 40 at the lower end of the transition tube 22, the nozzle 40 is provided with fine holes, fine metal droplets are formed in the process that the molten metal flows out through the holes in the nozzle 40, the inner heater 41 is arranged below the nozzle 40, when the steam pressure in the evaporation crucible 23 is insufficient, the inner heater 41 is started, the metal droplets are directly heated and evaporated in the process of flowing through the inner heater 41, the metal steam is quickly supplemented into the evaporation crucible 23, and when the steam pressure in the evaporation crucible 23 is normal, the inner heater 41 is closed, and the liquid supplementation is continuously carried out through the metal droplets.

7) When the infrared liquid level meter 34 detects that the liquid level reaches the set value, the transition tube heater 29 on the outer side of the transition tube 22 is stopped, so that the metal liquid in the transition tube 22 is rapidly solidified, and the material supplement to the evaporation crucible 23 is stopped;

8) the silo vacuum chamber 26 is closed, the feed supplement chamber cover plate 27 is opened, metal particles are added into the silo 25 through the feeding hopper 28, and the transition pipe 22 is not blocked through the tripper 32.

Preferably, the ratio of the diameter of the metal particles 30 to the inner diameter of the transition tube 22 is 1: 5-1: 10, the metal particles 30 may be spherical, cylindrical, or other various shaped particles.

Preferably, the inner flow guiding section 31 of the transition pipe 22 is provided with a constriction to provide a sealing effect during the solidification process. When a fluid replacement command is received, the transition pipe heater 29 is started, and the power of the transition pipe heater 29 is related to the inner diameter and the wall thickness of the transition pipe 22 as follows:

the inner diameter of the transition pipe 22 is 20-35 mm, the wall thickness is 5-15 mm, and the power of the transition pipe heater 29 is set to be 3-10 KW;

the inner diameter of the transition pipe 22 is 35-50 mm, the wall thickness is 5-15 mm, and the power of the transition pipe heater 29 is set to be 10-20 KW;

the inner diameter of the transition pipe 22 is 50-75 mm, the wall thickness is 5-20 mm, and the power of the transition pipe heater 29 is set to be 20-30 KW;

the inner diameter of the transition pipe 22 is 75-100 mm, the wall thickness is 5-20 mm, and the power of the transition pipe heater 29 is set to be 30-50 KW.

Preferably, the volume ratio of the transition tube 22 with the inner diameter of 100mm to the evaporation crucible 23 is set as follows:

when the liquid supplementing time is less than or equal to 5min, the volume ratio of the transition tube to the evaporation crucible is 1: 20-1: 30, of a nitrogen-containing gas;

when the liquid supplementing time is less than or equal to 20min and is less than or equal to 5min, the volume ratio of the transition tube to the evaporation crucible is 1: 30-1: 40.

preferably, the pressure P in the feed chamber 21_{Supplement device}Is in contact with the pressure P in the evaporation crucible 23_{Steaming food}The relationship between them is as follows:

when the liquid level in the evaporation crucible 23 is lower than the normal liquid level of 1/3, P_{Supplement device}≥50P_{Steaming food}；

When the liquid level in the evaporation crucible 23 is lower than the normal liquid level of 1/4, P_{Supplement device}≥200P_{Steaming food}；

When the liquid level in the evaporation crucible 23 is lower than the normal liquid level of 1/5, P_{Supplement device}≥500P_{Steaming food}。

Preferably, the power P of the crucible heater 33 and the pressure P in the evaporation crucible 23_{Steaming food}The relationship between them is as follows:

when the pressure P in the evaporation crucible 23 is increased_{Steaming food}When the pressure is lower than the normal pressure of 1/3, P is more than or equal to 1.2P_{Steaming food}；

When the pressure P in the evaporation crucible 23 is increased_{Steaming food}When the pressure is lower than the normal pressure of 1/4, P is more than or equal to 1.5P_{Steaming food}；

When the pressure P in the evaporation crucible 23 is increased_{Steaming food}When the pressure is lower than the normal pressure of 1/5, P is more than or equal to 2P_{Steaming food}。

Examples

Before the start of coating, 5kg of metal material is preloaded in the evaporation crucible 23, the transition tube 22 adopts a funnel-shaped structure, the drainage section 31 is installed in the transition tube 22, 10kg of metal material with the diameter of 1cm is installed above the drainage section 31, and at the moment, the cover plate 27 of the feeding material chamber is closed. And simultaneously vacuumizing the material supplementing chamber 21 and the film coating chamber 24 to 1.0Pa, closing the valve 38, stopping vacuumizing the material supplementing chamber 21, and filling argon gas for sealing, wherein the pressure of the argon gas is 20000 Pa. At this time, the evaporation crucible 23 and the coating nozzle 36 are gradually heated, the temperature of the evaporation crucible 23 is controlled to be 1000-1200 ℃, and the temperature of the coating nozzle 36 is controlled to be 600-800 ℃. After the metal material in the evaporation crucible 23 is completely melted, the pressure value inside the evaporation crucible 23 is detected by a pressure detection element, and when the specified pressure is reached, the metal plate strip 42 starts to move, the valve 38 is opened, and the coating nozzle 36 performs spraying. At this time, the infrared level meter 34 detects the change of the liquid level of the molten metal 44 in the evaporation crucible 23, when the liquid level is lower than the specified liquid level, the transition tube heater 29 starts to melt the metal material in the transition tube 22 and gradually flows into the evaporation crucible 23, and after the drainage segment 31 falls down, the solid metal material above the drainage segment is driven to continuously enter the transition tube 22 and be melted into the molten metal to enter the evaporation crucible 23. The liquid level of the molten metal in the evaporation crucible 23 rises with the addition of the metal material, and is detected by the infrared level gauge 34. The molten metal in the transition tube 22 passes through the nozzle 40 and forms fine droplets of metal into the evaporation crucible 23. When the liquid level of the molten metal 44 in the evaporation crucible 23 is lower than 1/3 standard liquid level, the internal heater 41 of the evaporation crucible 23 is started, so that the passing molten metal drops are quickly evaporated to form steam to be supplemented into the coating nozzle 36, and after the pressure in the evaporation crucible 23 is stabilized, the power of the internal heater 41 is stopped, and the liquid supplementing through the drops is continued. When the liquid level rises to a designated position, the material loosening device 32 is rotated to block the falling zinc liquid, the heating power of the transition pipe heater 29 is reduced, so that the metal material is continuously condensed at the position of the drainage section 31, and when the zinc liquid is completely solidified, the material supplementing process is finished. At this time, the replenishing-material chamber cover plate 27 is opened to replenish the metal material, and after the replenishment, the replenishing-material chamber cover plate 27 is closed and evacuated, and then argon gas is introduced.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.