Submillimeter-level high-temperature active metal liquid drop forming device and using method thereof

Abstract

The invention discloses a submillimeter-level high-temperature active metal liquid drop forming device and a using method thereof. The submillimeter-level high-temperature active metal liquid drop forming device comprises a suction and injection pipe with a first control valve, an inert gas cylinder, a communicating pipe, a gauge pipe and a position adjusting corrugated pipe. The inert gas cylinder is arranged on one side of the suction and injection pipe and is communicated with the suction and injection pipe through a communicating pipe, and a flow meter is arranged on the communicating pipe; the gauge tube is arranged at the top of the suction-injection tube; the position adjusting corrugated pipe sleeves the suction-injection pipe, one end of the position adjusting corrugated pipe is fixedly connected with the outer wall of the suction-injection pipe, the other end of the position adjusting corrugated pipe slides relative to the axis direction of the suction-injection pipe, and the position adjusting corrugated pipe and the outer wall of the suction-injection pipe define an annular cavity with a single-side opening; and the annular cavity is communicated with the communicating pipe through a branch pipe with a second control valve. The invention relates to the technical field of surface wettability detection of high-temperature liquid metal materials, through the arrangement, extraction and titration operation of high-temperature active liquid metal can be better completed, and large errors of experimental results caused by oxidation of the high-temperature active liquid metal are avoided.

Description

Technical Field

[0001] The present invention belongs to the field of surface wettability detection of high-temperature liquid metal materials, and relates to a high-temperature active metal liquid droplet forming technology, specifically a sub-millimeter-level high-temperature active metal liquid droplet forming device and a method for using the same. Background Art

[0002] Wetting refers to the process of one fluid replacing another fluid from the solid surface. The wettability depends on the surface tension of the two phases. For a given solid, the smaller the surface tension of the liquid, the smaller its contact angle on the solid; for a given liquid, the greater the surface energy of the solid, the smaller the contact angle. The smaller the contact angle, the easier the wetting process is. It is customary to position the contact angle of 90° as the dividing line between wetting and non-wetting. When the contact angle is less than 90°, it is in a wetting state, and when the contact angle is greater than 90°, it is in a non-wetting state.

[0003] Wetting is applied to all aspects of production and life. For example, in the biomedical field, regulating the wettability of the material surface can control the interaction between cells and materials, thereby realizing applications such as surface sterilization of medical devices and sustained release of drugs. In the energy field, regulating wettability can improve liquid flow transmission capabilities and improve the efficiency of energy devices.

[0004] In the field of nuclear fusion, the liquid-solid first wall (liquid lithium / lithium alloy wall) is one of the solutions to the solid first wall that has received widespread attention in recent years. The core idea is to cover the solid target plate with a layer of flowing liquid metal, thereby preventing the solid target plate from directly contacting with the high-temperature plasma. This effectively solves the problems of radiation damage and impurity generation faced by the solid target plate, and also improves the heat load carrying capacity and plasma performance to a certain extent. The good wettability of liquid metal on the material surface can not only reduce its flow resistance in the pipeline, but also help to form a circulating film flow that evenly spreads and covers the surface of the first wall. However, due to the large influence of factors such as the working environment on the wettability of liquid lithium, it is difficult to achieve 100% coverage of the liquid metal on the surface of the solid material during the application of the liquid-solid first wall, so it is necessary to carry out research on the wetting characteristics of liquid metal on the target plate surface.

[0005] At present, because liquid lithium and its alloys (melting point between 180-300 degrees) have strong activity, they are easy to react with hydrogen, nitrogen, oxygen, etc. in the air, and explode when they meet water at high temperature, so it is usually necessary to complete the wettability detection of the surface of high-temperature solid materials in a vacuum environment. In the prior art, the wettability detection system of high-temperature active liquid metal usually includes a detection chamber, a sample changing chamber, a melting crucible, a driving system, an injection system, a vacuum system, a heating system, a lighting system and a measurement system. It specifically realizes the detection of the wettability of high-temperature active liquid metal (lithium) through the following steps, specifically:

[0006] (1) heating the melting crucible to 350° C., heating the injection tube and the injection head to 300° C., and waiting for the lithium ingot to melt;

[0007] (2) Close the needle valve and compress the suction bellows to half of its stroke;

[0008] (3) compressing and adjusting the bellows so that the syringe head is immersed in the liquid lithium;

[0009] (4) releasing the suction bellows to extract liquid lithium;

[0010] (5) Open the mechanical pump angle valve, open the gate valve between the detection chamber and the sample exchange chamber to pump to less than 10Pa, and open the molecular pump to pump to 10-4Pa;

[0011] (6) Push the sample plate to the position directly below the injection head, compress the adjustment bellows to the appropriate position on the top of the sample plate, and compress the suction bellows to drip lithium drops;

[0012] (7) Use a high-speed camera to take pictures to measure the wetting angle, import them into a high-performance computer, calculate the wetting angle, and the experiment is over.

[0013] From the above steps, it can be seen that in the process of high-temperature active metal wetting performance testing, the injection system is needed to complete the extraction and dripping of liquid lithium. However, liquid metal, especially lithium, is easily oxidized. Therefore, when conventional syringes on the market are used for extraction and dripping of liquid lithium, there will be residual gas inside, which will cause large errors in subsequent experimental results, that is, it is difficult to meet the actual application needs.

[0014] Therefore, a sub-millimeter-scale high-temperature active metal droplet forming device and a method of using the same are needed to solve the above-mentioned problems. Summary of the invention

[0015] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a submillimeter-level high-temperature active metal droplet forming device and a method of using the same, so as to better complete the extraction and titration operations of the high-temperature active liquid metal, and avoid the large error in the experimental results caused by the oxidation of the high-temperature active liquid metal. The present invention sets up an injection pipe, an inert gas bottle, a connecting pipe, a regulating pipe and a positioning bellows, and the inert gas bottle is connected to the injection pipe through the connecting pipe, and the positioning bellows is sleeved on the outer wall of the injection pipe to surround the annular chamber with a single-side opening, and the annular chamber is connected to the connecting pipe through a branch pipe, so that when it is applied, the inert gas in the inert gas bottle can be output to the injection pipe and the annular chamber, and then the vacuum operation of the vacuum test chamber is cooperated to complete the rapid discharge of the residual air in the liquid forming device and the vacuum test chamber, so as to ensure that the liquid metal will not interfere with the experimental results due to oxidation during the extraction and droplet operation, so as to better meet the actual application needs.

[0016] To achieve the above-mentioned object, the first aspect of the present invention provides a sub-millimeter-scale high-temperature active metal droplet forming device, comprising an injection and suction pipe with a first control valve, an inert gas bottle, a connecting pipe, a regulating pipe, and a position-adjusting bellows;

[0017] The inert gas bottle is arranged at one side of the suction and injection pipe, and is connected with the suction and injection pipe through the connecting pipe, and a flow meter is arranged on the connecting pipe;

[0018] The regulating pipe is arranged at the top of the suction and injection pipe, and the connection between the connecting pipe and the suction and injection pipe is located between the first control valve and the regulating pipe;

[0019] The positioning bellows is sleeved on the outside of the suction and injection pipe, and one end is fixedly connected to the outer wall of the suction and injection pipe, and the other end slides relative to the axis direction of the suction and injection pipe and surrounds the outer wall of the suction and injection pipe to form an annular chamber with a single-side opening;

[0020] The annular chamber is connected to the connecting pipe via a branch pipe with a second control valve, and the connection between the branch pipe and the connecting pipe is located between the flow meter and the suction and injection pipe.

[0021] Furthermore, the positioning bellows is used to be connected to the opening of the vacuum test chamber through a flange, so that when the positioning bellows is extended or contracted, the suction and injection tube is pulled to move in the height direction of the vacuum test chamber, so as to be used to extract the heated molten metal on the crucible in the vacuum test chamber and complete the separation after extraction.

[0022] Furthermore, the outer wall of the suction and injection pipe is provided with a first connecting flange and a second connecting flange in sequence from top to bottom;

[0023] The first connecting flange is used to be mounted on the regulating pipe;

[0024] The second connecting flange is used to connect the upper end surface of the position-adjusting bellows.

[0025] Furthermore, the first control valve is arranged between the first connecting flange and the second connecting flange.

[0026] Furthermore, a needle is welded to the bottom end of the suction tube, and the end face of the needle is configured as a wedge-shaped face.

[0027] Furthermore, an adjusting mechanism is provided on the position-adjusting bellows for controlling the expansion and contraction of the position-adjusting bellows.

[0028] Furthermore, the adjustment mechanism includes a connecting plate and a screw;

[0029] The connecting plate is fixedly mounted on the outer walls of the upper and lower end surfaces of the position-adjusting bellows;

[0030] One end of the screw is rotatably engaged with one of the connecting plates, and the other end of the screw threadably penetrates the other connecting plate;

[0031] When the screw is rotated, the distance between the two connecting plates can be adjusted, and the adjustment bellows can be simultaneously driven to expand and contract.

[0032] Further, it also includes a heating sleeve;

[0033] The heating sleeve is welded to the outside of the bottom end of the suction and injection tube and is provided with a heating wire inside.

[0034] Furthermore, the flow meter is connected to the intelligent terminal signal;

[0035] The suction and injection pipe, the connecting pipe and the branch pipe are all made of stainless steel.

[0036] On the other hand, the present invention also proposes a method for using a sub-millimeter-level high-temperature active metal droplet forming device, including the sub-millimeter-level high-temperature active metal droplet forming device described in the above embodiment, specifically comprising the following steps:

[0037] A sub-millimeter-scale high-temperature active metal droplet forming device is installed on the vacuum test chamber, and the annular chamber is connected to the vacuum test chamber;

[0038] Open the flow meter, the first control valve and the second control valve, so that the inert gas in the inert gas bottle passes through the first channel formed by the connecting pipe and the suction and injection pipe and the second channel formed by the connecting pipe and the branch pipe, respectively, to complete the emptying of the residual gas in the sub-millimeter high-temperature active metal droplet forming device;

[0039] Turn off the flow meter and evacuate the vacuum test chamber. After the vacuum is stable, record the vacuum degree of the vacuum test chamber and the suction and injection pipe through the gauge.

[0040] The first control valve is closed, and the adjustment bellows is controlled to be compressed, so that the suction and injection pipe is extended into the metal liquid heated by the crucible in the vacuum test chamber. At the same time, the flow meter is turned on to allow the inert gas to enter the vacuum test chamber through the second channel. Under the action of gas pressure, the metal liquid enters the suction and injection pipe;

[0041] Close the second control valve and control the extension of the adjustment bellows to separate the suction and injection pipe containing the molten metal from the crucible;

[0042] Open the first control valve to allow the inert gas in the inert gas bottle to pass through the first channel to complete the dripping of the molten metal in the suction and injection tube.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] By arranging a suction and injection pipe, an inert gas bottle, a connecting pipe, a regulating pipe and a position-adjusting bellows, and making the inert gas bottle and the suction and injection pipe connected through the connecting pipe, and the position-adjusting bellows is sleeved on the outer wall of the suction and injection pipe to surround and form an annular chamber with a single-side opening, and making the annular chamber and the connecting pipe connected through a branch pipe, when it is applied, the inert gas in the inert gas bottle can be output to the suction and injection pipe and the annular chamber, and then the vacuum operation of the vacuum test chamber can be cooperated to complete the rapid discharge of residual air in the liquid forming device and the vacuum test chamber, so as to ensure that the liquid metal will not interfere with the experimental results due to oxidation during the extraction and droplet operation, so as to better meet the actual application needs.

[0045] Furthermore, since the gauge is connected to the first channel formed by the connecting pipe and the suction and injection pipe and the second channel formed by the connecting pipe and the branch pipe, the gauge can measure the vacuum degree in the first channel as well as the second channel. Therefore, compared with the method of setting two groups of gauges for separate measurements, the present device can make the overall structure more compact and achieve the purpose of reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a schematic structural diagram of a sub-millimeter-scale high-temperature active metal droplet forming device in one embodiment of the present invention;

[0048] Figure 2 It is a schematic structural diagram of the adjusting mechanism in a sub-millimeter-level high-temperature active metal droplet forming device in one embodiment of the present invention;

[0049] Figure 3 It is a schematic structural diagram of a sub-millimeter-level high-temperature active metal droplet forming device applied in a vacuum test chamber in one embodiment of the present invention;

[0050] Figure 4 This is a flow chart of the method of using the sub-millimeter high-temperature active metal droplet forming device in another embodiment of the present invention.

[0051] Figure Number:

[0052] 1. Injection pipe; 11. First control valve; 12. First connecting flange; 13. Second connecting flange; 14. Needle; 2. Inert gas bottle; 3. Connecting pipe; 31. Flow meter; 4. Regulating pipe; 5. Adjusting bellows; 6. Annular chamber; 7. Branch pipe; 71. Second control valve; 8. Vacuum test chamber; 9. Adjusting mechanism; 91. Connecting plate; 92. Screw; 10. Heating sleeve. DETAILED DESCRIPTION

[0053] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Embodiment 1

[0055] See also Figure 1 and Figure 3 The first embodiment of the present invention provides a sub-millimeter-scale high-temperature active metal droplet forming device, including an injection and suction pipe 1 with a first control valve 11, an inert gas bottle 2, a connecting pipe 3, a regulating pipe 4 and a position adjustment bellows 5.

[0056] The inert gas bottle 2 is disposed at one side of the suction and injection pipe 1 , and is connected with the suction and injection pipe 1 through the connecting pipe 3 , and a flow meter 31 is disposed on the connecting pipe 3 .

[0057] In addition, the gauge 4 is arranged at the top of the suction and injection pipe 1, and the connection between the connecting pipe 3 and the suction and injection pipe 1 is located between the first control valve 11 and the gauge 4, so that when the first control valve 11 and the flowmeter 31 are both in the open state, the inert gas can be discharged from the inert gas bottle 2 along the first channel formed by the connecting pipe 3 and the suction and injection pipe 1 to discharge the residual air in the suction and injection pipe 1.

[0058] The positioning bellows 5 is sleeved on the outside of the suction and injection pipe 1, and one end is fixedly connected to the outer wall of the suction and injection pipe 1, and the other end slides relative to the axial direction of the suction and injection pipe 1. When the telescopic end of the positioning bellows 5 is installed on the vacuum test chamber 8, and the end of the suction and injection pipe 1 extends into the inside of the vacuum test chamber 8, the positioning bellows 5 is telescopic, and can synchronously drive the suction and injection pipe 1 to move in the height direction, so that the end of the suction and injection pipe 1 can be immersed in the molten metal liquid to complete the extraction and separation operations.

[0059] The positioning bellows 5 and the outer wall of the suction and injection tube 1 surround and form an annular chamber 6 with a single-side opening, and the annular chamber 6 is used to communicate with the inner cavity of the vacuum test chamber 8 to form a containing cavity.

[0060] In addition, the annular chamber 6 is connected to the connecting pipe 3 through a branch pipe 7 with a second control valve 71, and the connection between the branch pipe 7 and the connecting pipe 3 is located between the flow meter 31 and the suction and injection pipe 1. Therefore, when the flow meter 31 and the second control valve 71 are both in the open state, the inert gas can be injected into the cavity from the inert gas bottle 2 along the second channel formed by the connecting pipe 3 and the branch pipe 7, and the vacuum equipment of the vacuum experiment chamber 8 is cooperated to complete the discharge operation of the residual air in the cavity to ensure that the experimental environment is in a vacuum state, thereby effectively avoiding the occurrence of large errors in the experimental results due to oxidation of high-temperature active metals during the experiment.

[0061] The device is provided with an injection and suction pipe 1, an inert gas bottle 2, a connecting pipe 3, a regulating pipe 4 and a position-adjusting bellows 5, and the inert gas bottle 2 is connected with the injection and suction pipe 1 through the connecting pipe 3, and the position-adjusting bellows 5 is sleeved on the outer wall of the injection and suction pipe 1 to surround and form an annular chamber 6 with a single-side opening, and the annular chamber 6 is connected with the connecting pipe 3 through a branch pipe 7, so that when it is used, the inert gas in the inert gas bottle 2 can be output to the injection and suction pipe 1 and the annular chamber 6, and then the vacuum operation of the vacuum test chamber 8 can be cooperated to complete the rapid discharge of residual air in the liquid forming device and the vacuum test chamber 8, so as to ensure that the liquid metal will not interfere with the experimental results due to oxidation during the extraction and droplet operation, so as to better meet the actual application needs.

[0062] In addition, since the gauge 4 is connected to the first channel formed by the connecting pipe 3 and the suction and injection pipe 1 and the second channel formed by the connecting pipe 3 and the branch pipe 7, the gauge 4 can complete the measurement of the vacuum degree in the first channel and the second channel, that is, complete the measurement of the vacuum degree in the submillimeter high-temperature active metal droplet forming device and the vacuum degree in the cavity. Therefore, compared with the method of setting two groups of gauges 4 to perform separate measurements respectively, the present device can make the overall structure more compact and achieve the purpose of reducing costs.

[0063] In this embodiment, the positioning bellows 5 is further limited so as to be better installed on the vacuum test chamber 8, so as to realize the function of facilitating the control of the movement of the suction and injection tube 1 in the height direction.

[0064] Specifically, the positioning bellows 5 is used to be connected to the opening of the vacuum test chamber 8 through a flange, so that when the positioning bellows 5 is extended or contracted, the suction and injection tube 1 is pulled to move in the height direction of the vacuum test chamber 8, so as to extract the heated molten metal on the crucible in the vacuum test chamber 8 and complete the separation after extraction, that is, the opening of the vacuum test chamber 8 can provide support for the telescopic end of the positioning bellows 5, so that when the positioning bellows 5 is in a compressed state, the end of the suction and injection tube 1 can be extended into the vacuum test chamber 8, thereby being immersed in the molten metal in the heated crucible on the vacuum test chamber 8 to complete the extraction function; and when the positioning bellows 5 is in an extended state, the suction and injection tube 1 can be separated from the heated crucible, that is, the separation after the molten metal is extracted is completed, so as to facilitate subsequent droplet operations.

[0065] like Figure 2 As shown, in a further embodiment, in order to facilitate the operator to control the switching of the position-adjusting bellows 5 between the extended and contracted states, an adjusting mechanism 9 is provided on the position-adjusting bellows 5 for controlling the extension and contraction of the position-adjusting bellows 5 .

[0066] Specifically, the adjustment mechanism 9 includes a connecting plate 91 and a screw rod 92 .

[0067] The connecting plate 91 is fixedly mounted on the outer walls of the upper and lower end surfaces of the position-adjusting bellows 5 .

[0068] Furthermore, one end of the screw rod 92 is rotationally fitted with one of the connecting plates 91 , and the other end of the screw rod 92 is threadedly penetrated through the other connecting plate 91 .

[0069] Through the above arrangement, when the screw rod 92 rotates, the distance between the two connecting plates 91 can be adjusted, and the position-adjusting bellows 5 can be simultaneously driven to expand and contract.

[0070] In this embodiment, the suction and injection pipe 1 is further defined so as to better install the positioning bellows 5 on the suction and injection pipe 1 .

[0071] Specifically, the outer wall of the suction and injection pipe 1 is provided with a first connecting flange 12 and a second connecting flange 13 in sequence from top to bottom.

[0072] The first connecting flange 12 is used for being installed on the regulating pipe 4 , and the second connecting flange 13 is used for being connected to the upper end surface of the adjusting bellows 5 .

[0073] It should be noted that the first control valve 11 is arranged between the first connecting flange 12 and the second connecting flange 13 to save space.

[0074] In other embodiments, the connection end between the suction and injection tube 1 and the metal liquid is further defined. Specifically, a needle 14 is welded to the bottom end of the suction and injection tube 1, and the end face of the needle 14 is set as a wedge-shaped surface. The oblique mouth design is used to facilitate the separation of the droplet from the tip of the needle 14, and to prevent the droplet from shrinking and adhering to the tip of the needle 14 due to surface tension, resulting in a large error in the experimental results.

[0075] Please continue reading Figure 1 In this embodiment, the sub-millimeter high-temperature active metal droplet forming device also includes a heating sleeve 10, which is used to continuously heat the extracted molten metal to ensure the molten state of the molten metal, which is convenient for subsequent liquid operations.

[0076] Specifically, the heating sleeve 10 is welded to the outside of the bottom end of the suction and injection tube 1 and has a built-in heating wire, that is, the heating of the molten metal is completed by the heating wire, and the temperature heated by the heating wire can be adjusted according to the amount of electricity passed in. This is the existing technology, so it will not be elaborated here.

[0077] In other embodiments, the flow meter 31 is connected to the smart terminal signal, that is, the vacuum degree is set by the smart terminal to automatically control the gas output of the inert gas bottle 2, thereby completing the control of the metal liquid droplet outflow speed and improving the experimental accuracy.

[0078] In addition, it should be noted that the suction and injection pipe 1, the connecting pipe 3 and the branch pipe 7 are all made of stainless steel to ensure the strength of the overall device and meet the requirements of high temperature resistance.

[0079] Embodiment 2

[0080] like Figure 3 and Figure 4 As shown, in order to better explain the application principle and application process of the submillimeter-level high-temperature active metal droplet forming device to meet the experimental application requirements. Therefore, this embodiment further proposes a method for using the submillimeter-level high-temperature active metal droplet forming device based on the first embodiment, including the submillimeter-level high-temperature active metal droplet forming device described in the first embodiment, specifically including the following steps:

[0081] The sub-millimeter-scale high-temperature active metal droplet forming device is installed on the vacuum test chamber 8, and the annular chamber 6 is connected to the vacuum test chamber 8;

[0082] Open the flow meter 31, the first control valve 11 and the second control valve 71, so that the inert gas in the inert gas bottle 2 passes through the first channel formed by the connecting pipe 3 and the suction and injection pipe 1 and the second channel formed by the connecting pipe 3 and the branch pipe 7, respectively, to complete the emptying of the residual gas in the sub-millimeter high-temperature active metal droplet forming device;

[0083] Turn off the flow meter 31, and evacuate the vacuum test chamber 8. After the vacuum is stable, record the vacuum degree of the vacuum test chamber 8 and the suction and injection pipe 1 through the gauge 4;

[0084] The first control valve 11 is closed, and the adjustment bellows 5 is controlled to be compressed, so that the suction and injection pipe 1 extends into the molten metal heated by the crucible in the vacuum test chamber 8. At the same time, the flow meter 31 is turned on to allow the inert gas to enter the vacuum test chamber 8 through the second channel. Under the action of the gas pressure, the molten metal enters the suction and injection pipe 1;

[0085] The second control valve 71 is closed, and the adjustment bellows 5 is controlled to extend so that the suction and injection pipe 1 sucking the molten metal is separated from the crucible;

[0086] The first control valve 11 is opened to allow the inert gas in the inert gas bottle 2 to pass through the first channel, thereby completing the dripping of the molten metal in the suction and injection pipe 1 .

[0087] Through the above steps, the submillimeter high-temperature active metal droplet forming device described in Example 1 is installed on the vacuum test chamber 8, and the switching of the opening and closing states among the first control valve 11, the second control valve 71 and the flowmeter 31 and the vacuum pumping operation of the vacuum test chamber 8 are coordinated to sequentially complete the discharge of residual air inside the submillimeter high-temperature active metal droplet forming device and the residual air in the vacuum test chamber 8, complete the extraction of molten metal by the suction and injection pipe 1 under the expansion and contraction action of the positioning bellows 5, and finally drip out the molten metal in the suction and injection pipe 1, so that in this process, the molten metal will not be oxidized by the air, thereby ensuring the accuracy of subsequent experimental results to meet the actual application requirements.

[0088] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A sub-millimeter high-temperature active metal droplet forming device, characterized in that: It comprises an injection and suction pipe (1) with a first control valve (11), an inert gas bottle (2), a connecting pipe (3), a regulating pipe (4) and a position-adjusting bellows (5); The inert gas bottle (2) is arranged on one side of the suction and injection pipe (1), and is connected to the suction and injection pipe (1) through the connecting pipe (3), and a flow meter (31) is arranged on the connecting pipe (3); The regulating pipe (4) is arranged at the top of the suction pipe (1), and the connection between the connecting pipe (3) and the suction pipe (1) is located between the first control valve (11) and the regulating pipe (4); The positioning bellows (5) is sleeved on the outside of the suction and injection pipe (1), and one end is fixedly connected to the outer wall of the suction and injection pipe (1), and the other end slides relative to the axial center line direction of the suction and injection pipe (1) and surrounds the outer wall of the suction and injection pipe (1) to form an annular chamber (6) with a single-side opening; The annular chamber (6) and the connecting pipe (3) are connected via a branch pipe (7) with a second control valve (71), and the connection between the branch pipe (7) and the connecting pipe (3) is located between the flow meter (31) and the suction pipe (1).

2. A sub-millimeter-scale high-temperature active metal droplet forming device according to claim 1, characterized in that: The positioning bellows (5) is used to be connected to the opening of the vacuum test chamber (8) through a flange, so that when the positioning bellows (5) is extended or contracted, the suction and injection tube (1) is pulled to move in the height direction of the vacuum test chamber (8), so as to be used to extract the heated molten metal on the crucible in the vacuum test chamber (8) and complete the separation after the extraction.

3. The sub-millimeter high-temperature active metal droplet forming device according to claim 1, characterized in that: The outer wall of the suction and injection pipe (1) is provided with a first connecting flange (12) and a second connecting flange (13) in sequence from top to bottom; The first connecting flange (12) is used for being mounted on the regulating pipe (4); The second connecting flange (13) is used to connect the upper end surface of the position-adjusting bellows (5).

4. A sub-millimeter-scale high-temperature active metal droplet forming device according to claim 3, characterized in that: The first control valve (11) is arranged between the first connecting flange (12) and the second connecting flange (13).

5. The sub-millimeter-scale high-temperature active metal droplet forming device according to claim 1, characterized in that: A needle (14) is welded to the bottom end of the suction tube (1), and the end surface of the needle (14) is configured as a wedge-shaped surface.

6. The sub-millimeter-scale high-temperature active metal droplet forming device according to claim 1, characterized in that: The position-adjusting bellows (5) is provided with an adjusting mechanism (9) for controlling the expansion and contraction of the position-adjusting bellows (5).

7. A sub-millimeter-scale high-temperature active metal droplet forming device according to claim 6, characterized in that: The adjusting mechanism (9) comprises a connecting plate (91) and a screw rod (92); The connecting plate (91) is fixedly mounted on the outer walls of the upper and lower end surfaces of the position-adjusting bellows (5); One end of the screw rod (92) is rotatably fitted to one of the connecting plates (91), and the other end of the screw rod (92) is threadedly inserted through the other connecting plate (91); When the screw rod (92) rotates, the distance between the two connecting plates (91) can be adjusted, and the position-adjusting bellows (5) can be simultaneously driven to expand and contract.

8. The sub-millimeter-scale high-temperature active metal droplet forming device according to claim 1, characterized in that: Also includes a heating sleeve (10); The heating sleeve (10) is welded to the outside of the bottom end of the suction and injection tube (1) and has a built-in heating wire.

9. The sub-millimeter-scale high-temperature active metal droplet forming device according to claim 1, characterized in that: The flow meter (31) is connected to the intelligent terminal signal; The suction and injection pipe (1), the connecting pipe (3) and the branch pipe (7) are all made of stainless steel.

10. A method for using a sub-millimeter high-temperature active metal droplet forming device, characterized in that: It comprises a sub-millimeter-scale high-temperature active metal droplet forming device as described in any one of claims 1 to 9, specifically comprising the following steps: The sub-millimeter-scale high-temperature active metal droplet forming device is installed on the vacuum test chamber (8), and the annular chamber (6) is connected to the vacuum test chamber (8); Opening the flow meter (31), the first control valve (11) and the second control valve (71) to allow the inert gas in the inert gas bottle (2) to pass through a first channel formed by the connecting pipe (3) and the suction and injection pipe (1) and a second channel formed by the connecting pipe (3) and the branch pipe (7), thereby completing the exhaust of residual gas in the sub-millimeter high-temperature active metal droplet forming device; The flow meter (31) is turned off, and the vacuum test chamber (8) is evacuated. After the vacuum is stabilized, the vacuum degree of the vacuum test chamber (8) and the suction and injection tube (1) is recorded through the gauge (4); The first control valve (11) is closed, and the adjustment bellows (5) is controlled to be compressed, so that the suction and injection pipe (1) extends into the molten metal heated by the crucible in the vacuum test chamber (8), and at the same time, the flow meter (31) is turned on to allow the inert gas to enter the vacuum test chamber (8) through the second channel, and the molten metal enters the suction and injection pipe (1) under the action of gas pressure; The second control valve (71) is closed, and the position-adjusting bellows (5) is controlled to extend so that the suction and injection pipe (1) containing the sucked molten metal is separated from the crucible; The first control valve (11) is opened to allow the inert gas in the inert gas bottle (2) to pass through the first channel, thereby completing the dripping of the molten metal in the suction and injection pipe (1).

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