Pumping and injecting type molten metal stirring method

Abstract

The invention discloses a pumping and injecting type molten metal stirring method which is characterized in that a part of molten metal to be stirred in a molten metal pool is sucked into a containing space connected to the molten metal pool in a pumping mode, then the sucked molten metal is pressed back into the molten metal pool in a pressing and injecting mode, and stirring and mixing of the molten metal are completed. The device has the advantages of being good in stirring effect, low in pollution, more beneficial to dehydrogenation refining of molten metal and the like.

Description

Technical Field

[0001] The invention relates to the technical field of alloy smelting and metallurgy, and in particular to a pumping type metal melt stirring method. Background Art

[0002] Wire feeding technology in the field of metal smelting is a refining technology outside the furnace, that is, various additives (such as deoxidizers, desulfurizers, modifiers, alloys, etc.) are crushed into a certain particle size and wrapped with a thin steel strip to make cored wire, or the alloy is directly processed into wire, which is fed into the appropriate depth in the molten steel through the slag layer on the top of the ladle by a wire feeder, and interacts with the molten steel as it continues to melt, and performs adjustment operations such as deoxidation, desulfurization, micro-alloying, composition fine-tuning and modification.

[0003] In wire feeding technology, after adding the metal wire, stirring is often required to promote the homogenization of the melt composition. Conventional metal melt stirring is carried out by using a blade-type stirring mechanism. This stirring method with a blade structure has defects such as uneven stirring, easy introduction of contamination, and easy formation of gaps during the stirring process, which leads to reduced metallurgical quality.

[0004] In addition, when smelting some metals, such as lithium-containing alloys, it is necessary to consider introducing refining gas for dehydrogenation refining. Therefore, the applicant considered how to assist in achieving or improving the dehydrogenation effect during the stirring process, so as to obtain a more useful stirring method. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a pumping type metal melt stirring method with good stirring uniformity, low pollution, and the ability to better improve the stirring effect, and further make it conducive to the dehydrogenation refining of the metal melt.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method for stirring molten metal by pumping is characterized in that part of the molten metal to be stirred in the molten metal pool is sucked into a containing space connected to the molten metal pool by suction, and then the sucked molten metal is pressed back into the molten metal pool by injection to complete the stirring and mixing of the molten metal.

[0007] In this way, the method does not cause contact between the blades and the molten metal during stirring, and does not cause pollution due to the requirements of stirring shaft lubrication, etc. During stirring, the stirring effect can be controlled by controlling the volume, position and rate of the molten metal pumped in, which can produce a better stirring effect.

[0008] Furthermore, during injection, refined gas is used as a gas source for injection, and the volume of injection is controlled to be larger than the volume of suction.

[0009] In this way, during the injection process, part of the refined gas can be pressed into the molten metal, and the gas refining can be achieved simultaneously during the stirring process in coordination with the flow of the molten metal; making it particularly suitable for metal smelting stirring with dehydrogenation refining requirements.

[0010] Furthermore, the refining gas used during injection molding is argon, which can better protect the molten metal and refine the gas.

[0011] Furthermore, the present method relies on a pumping stirring device, which comprises two vertically arranged pumping pipes, which are made of high temperature resistant material (high temperature refers to the temperature of smelting alloy), and the two pumping pipes are arranged horizontally opposite to each other. A pumping port is opened at the lower end of the pumping pipe and is located in the molten liquid pool to be stirred, and a pumping pressure control device is connected to the upper end of the pumping pipe.

[0012] In this way, the melt is continuously pumped in and out by means of two extraction pipes, so as to fully mix and stir the solution, thereby better improving the stirring effect. Compared with the stirring method using stirring blades, it can better prevent the blades from stirring and causing gaps in the melt, thereby affecting the quality of the melt.

[0013] Furthermore, the extraction and pressure control device includes an extraction pipe and an injection pipe, one end of which is connected to the upper end of the extraction and injection pipe, the other end of the injection pipe is connected to a compressed gas tank after an injection electric-controlled valve and a pressure gauge are arranged in series, and the other end of the extraction pipe is connected to an extraction electric-controlled valve and an extraction pump in series. The injection electric-controlled valve, the pressure gauge, the extraction electric-controlled valve and the extraction pump are respectively connected to a control center. A control module is arranged in the control center for realizing the opening and closing of the injection electric-controlled valve of the compressed gas tank and the switching control of the extraction electric-controlled valve and the extraction pump.

[0014] In this way, when the compressed gas tank's gas injection electric control valve is closed, the gas extraction electric control valve and the gas extraction pump are opened, so that the gas injection pipe stops working and the gas extraction pipe extracts gas from the extraction pipe to form a negative pressure, so that the molten liquid is sucked into the extraction pipe from the extraction port; then the compressed gas tank's gas injection electric control valve is switched to open, and the gas extraction electric control valve and / or the gas extraction pump are controlled to close at the same time, so that the gas extraction pipe stops working and the gas injection pipe injects gas into the extraction pipe to form a positive pressure, so that the molten liquid in the extraction pipe is pressed out from the extraction port back into the molten liquid pool. This repeated cycle switching is used to control the extraction action of the extraction pipe, so that the molten liquid is repeatedly sucked into the extraction pipe and injected, achieving a mixing and stirring effect on the solution.

[0015] Furthermore, a timing control program is also provided in the control module of the control center, and the timing control program is used to control the pumping tubes on both sides to perform pumping actions synchronously for several rounds, and then control the pumping tubes on both sides to perform pumping actions alternately for several rounds and repeat this cycle.

[0016] In this way, since the injection port of the injection pipe is set downward, in the process of the injection pipes on both sides performing the injection action synchronously, when sucking the molten liquid, the lower layer of the molten liquid can be sucked into the injection pipe by rapid suction, and the upper layer of the molten liquid can be stopped when it drops to the vicinity of the injection port; then, when the molten liquid in the injection pipe is pressed back, the molten liquid can be slowly injected to make it flow back to the top of the molten pool, so as to realize the up and down exchange flow of the molten liquid in the molten pool. Then, in the process of the injection pipes on both sides performing the injection action alternately, when the injection pipe on one side sucks the solution, the injection pipe on the other side correspondingly presses out the molten liquid, so as to realize the repeated flow of the molten liquid in the horizontal direction in the molten pool. Therefore, this control method can realize the repeated exchange flow control of the molten liquid in the vertical and horizontal directions successively, greatly improving the stirring control effect of the molten liquid, and overcoming the defects of the blade stirring method that easily leads to uneven stirring and the generation of gaps in the molten liquid.

[0017] Furthermore, the gas in the compressed gas tank is refined gas (argon), so as to better achieve gas protection.

[0018] Furthermore, during the process of controlling the extraction and injection of the extraction and injection tube by the control module, the volume of the suction is smaller than the volume of the pressure injection.

[0019] This way, the injection volume is larger, which can better press out the molten metal sucked into the injection pipe during suction, avoiding the molten metal from adhering to the inner wall of the injection pipe. At the same time, part of the refined gas can be directly pressed into the molten pool during injection, further improving the dehydrogenation effect of gas refining while stirring and mixing.

[0020] Furthermore, a lifting control mechanism is also provided at the upper end of each extraction tube and connected thereto.

[0021] In this way, by controlling the lifting and lowering of the pumping tube, the exchange and stirring effect of the upper and lower layer solutions in the solution pool can be better assisted.

[0022] Furthermore, the lifting mechanism includes a vertically arranged telescopic electric cylinder, the telescopic head of the telescopic electric cylinder is fixed to the pumping pipe through a horizontal connecting beam, and the motor of the telescopic electric cylinder is connected to the control center, so that installation and control are conveniently realized.

[0023] Furthermore, an ultrasonic level detector facing downward is installed on the outer wall of the injection tube and the upper end of the inner cavity wall, and the ultrasonic level detector is connected to the control center. In this way, the liquid level inside and outside the injection tube can be monitored in real time, which can better assist in achieving control.

[0024] Furthermore, the outer wall of the pumping tube is also provided with an electric heating device, so as to conveniently realize the warming heating inside the pumping tube.

[0025] In summary, the present invention has the advantages of good stirring effect, low pollution, and is more conducive to the dehydrogenation refining of molten metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic cross-sectional structure diagram of a device for continuously forming a lithium-containing alloy melt used in an embodiment of the present invention.

[0027] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the separate accommodating body part.

[0028] Figure 3 for Figure 1 A cross-sectional view of the separate wire and gas delivery tube and its internal structure.

[0029] Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure of the separate wire gas delivery pipe body.

[0030] Figure 5 for Figure 1 Schematic diagram of the planar structure of the separate guide slope and the guide plate above it.

[0031] Figure 6 for Figure 1 Schematic diagram of the structure of the separate suction type stirring device. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with specific implementation modes.

[0033] Embodiment: A method for stirring molten metal by suction, characterized in that part of the molten metal to be stirred in the molten metal pool is sucked into a containing space connected to the molten metal pool by suction, and then the sucked molten metal is pressed back into the molten metal pool by pressure injection to complete the stirring and mixing of the molten metal.

[0034] In this way, the method does not cause contact between the blades and the molten metal during stirring, and does not cause pollution due to the requirements of stirring shaft lubrication, etc. During stirring, the stirring effect can be controlled by controlling the volume, position and rate of the molten metal pumped in, which can produce a better stirring effect.

[0035] During implementation, refined gas is used as a gas source for injection, and the volume of injection is controlled to be larger than the volume of suction.

[0036] In this way, during the injection process, part of the refined gas can be pressed into the molten metal, and the gas refining can be achieved simultaneously during the stirring process in coordination with the flow of the molten metal; making it particularly suitable for metal smelting stirring with dehydrogenation refining requirements.

[0037] During implementation, the refining gas used during injection molding is argon, which can better protect the molten metal and refine the gas.

[0038] In this embodiment, the method is implemented by a lithium alloy melt continuous forming device, see Figure 1-6 As shown, the lithium alloy melt continuous forming device comprises a container 1 made of high temperature resistant material (high temperature refers to the temperature of smelting alloy), a liquid inlet 2 is arranged above one end of the container 1, a liquid inlet cabin 3 is arranged correspondingly below the liquid inlet 2, the liquid inlet cabin 3 is connected forwardly to a forming cabin 5 with a cabin cover 4, the forming cabin 5 is connected forwardly to a liquid outlet cabin 6 which is closed as a whole, a liquid outlet channel 7 is arranged below the liquid outlet cabin 6, a wire gas parallel delivery pipe 8 is also arranged vertically on the cabin cover 4 of the forming cabin, and a wire gas parallel delivery pipe 8 is arranged on the wire gas parallel delivery pipe 8. The end is exposed above the cabin cover and is sealed upwardly and connected with an air delivery pipe 9 and a wire feeding pipe 10. The air delivery pipe 9 and the wire feeding pipe 10 are both connected to the inside of the wire gas and delivery pipe and the connection is sealed with a sealing material. The outer end of the air delivery pipe 9 is used to be connected to a refined gas tank (not shown in the figure), and the outer end of the wire feeding pipe 10 is used to be connected to a wire feeding power mechanism (not shown in the figure). The lower end of the wire gas and delivery pipe 8 is located in the middle and lower position inside the forming cabin 5. A wire outlet 11 is provided in the middle of the lower end of the wire gas and delivery pipe 8, and a plurality of air outlets 12 are distributed around the wire outlet 11. Among them, a pumping type stirring device is also provided in the forming chamber 5, and the pumping type stirring device includes two vertically arranged pumping pipes 40, and the pumping pipes 40 are made of high temperature resistant material (high temperature refers to the temperature of smelting alloy), and the pumping pipes 40 are horizontally arranged opposite to each other and symmetrically arranged on both sides of the wire gas delivery pipe 8. A pumping port 41 is opened at the lower end of the pumping pipe 40 and is located in the molten liquid pool in the forming chamber, and a pumping pressure control device is connected to the upper end of the pumping pipe 40.

[0039] In this way, when the above device is used, the other alloy components except lithium are first melted and then enter the liquid inlet tank from the liquid inlet, and then enter the forming tank from the liquid inlet tank, and then the lithium is prepared as a wire material and sent from the wire feeding tube to the wire gas feeding tube and the wire is sent downward to the melt and melted therein, and the melt flow rate and wire feeding speed are controlled according to the lithium element ratio, and the smelted lithium element is driven by the sent refined gas to achieve stirring and dehydrogenation treatment, and gas refining is achieved. The refined gas floats from the melt to the surface of the melt to achieve atmosphere protection, and continuous in-situ aluminum-lithium alloy preparation is achieved. After mixing, the melt is accumulated in the liquid outlet tank and directly flows out from the liquid outlet channel to achieve casting. The defects caused by the floating stratification and hydrogen evolution of lithium are reduced, and the casting quality is improved. At the same time, the pumping stirring device is set up. When working, the melt relies on two pumping pipes to continuously pump in and press out, fully achieving the mixing and stirring of the solution. Compared with the stirring method using stirring blades, it can better prevent the blades from stirring and generating gaps in the melt and affecting the quality of the melt.

[0040] The entire container 1 is made of crucible material, which is convenient for smelting.

[0041] Among them, a concave impact groove 13 is provided on the bottom plate of the liquid inlet cabin 3, just below the liquid inlet. The incoming melt can be buffered to obtain a suitable flow rate, and the cabin body can be protected to a certain extent.

[0042] A slag discharge port 14 is provided at the upper end of the liquid inlet port 2 of the liquid inlet tank away from the forming tank, so as to facilitate the discharge of slag on the surface of the molten liquid.

[0043] Among them, a slag retaining wall 15 located above and a retaining dam 16 located below are vertically arranged in sequence along the flow direction of the molten liquid in the liquid inlet tank 3, a liquid flow space is left between the slag retaining wall 15 and the bottom plate of the liquid inlet tank below, the retaining dam 16 is connected to form a tank and leaves a liquid flow space between it and the upper hatch cover plate, one end of the hatch cover plate 4 extends into the top of the liquid inlet tank 3 and fixes the slag retaining wall 15 at its end.

[0044] In this way, the slag retaining wall can be used to block the light slag on the upper layer of the molten liquid. At the same time, the retaining effect of the retaining dam makes the liquid inlet tank have a certain depth to ensure that the molten liquid entering the forming tank has sufficient temperature and fluidity, and ensure the effect of subsequent wire feeding and melting treatment. At the same time, the structural setting of the retaining dam and the slag retaining wall makes the liquid inlet tank form a semi-open, semi-closed, and semi-open structure, which is convenient for liquid entry and heat preservation of the molten liquid.

[0045] Among them, the outer surface of the lower end of the silk and gas delivery pipe 8 is in the shape of a cone with an increasing diameter downward, the inner cavity of the lower end of the silk and gas delivery pipe 8 is in the shape of an inverted cone with a decreasing diameter downward at the cone, and a silk outlet 11 is formed in the middle position of the inverted cone of the inner cavity, and the air outlet 12 is inclined along the cone direction of the outer surface and is evenly distributed on the periphery of the silk outlet, and the air outlet 12 and the upper port connected to the inner cavity of the silk and gas delivery pipe 8 and the lower port connected to the formation cabin are staggered in the circumferential direction, and the staggered direction of each air outlet remains consistent along the circumferential direction.

[0046] In this way, the refining gas (argon) can be discharged along the cone shape to the outside and downward, which is convenient for the melted lithium liquid to flow around and form a spiral after the wire is discharged from the wire outlet, expanding the stirring range of the argon gas and the effect of driving the lithium liquid to mix with the initial alloy melt. Therefore, it is convenient for the refining gas and the melt to be fully mixed, so that some of the impurities such as hydrogen and oxygen in the melt are brought into the refining gas and removed together, realizing gas refining; and it can drive the lithium liquid to be fully mixed with the melt around to achieve smelting.

[0047] A supporting top plate 17 is spaced apart above the hatch cover 4 , a heat-insulating insulation layer is formed between the supporting top plate 17 and the hatch cover 14 , and the silk-gas parallel delivery pipe 8 is supported and installed on the supporting top plate 17 .

[0048] In this way, it is convenient to support and install the gas and air delivery pipes, and it is also beneficial to form the insulation of the cabin.

[0049] Among them, an electric heating module 18 is also arranged outside the wire and gas delivery pipe 8, and the electric heating module is located in the heat-insulating layer. This facilitates preheating of the lithium wire and the refined gas fed in, and better ensures that the melting temperature in the formation chamber is sufficient.

[0050] Among them, the liquid outlet end of the forming chamber 5 is provided with a liquid outlet retaining wall 19 separated from the liquid outlet chamber 6, and the lower end of the liquid outlet retaining wall 19 is provided with a liquid outlet hole 20 connected to the liquid outlet chamber 6, and a liquid outlet gate 21 is correspondingly provided at the liquid outlet hole 20. This facilitates the liquid outlet control, and when necessary, the liquid outlet gate can be intermittently switched on and off to extend the residence and stirring and mixing time of the molten liquid in the forming chamber, thereby increasing the stirring and mixing smelting effect.

[0051] Among them, a vertical fixed partition 22 is arranged in the forming chamber 5 along the flow direction of the molten liquid, and the fixed partition 22 divides the forming chamber 5 into multiple small chambers along the width direction. Each small chamber is respectively provided with a silk gas delivery pipe 8, and each small chamber is provided with a liquid outlet hole 20 at the liquid outlet end to communicate with the liquid outlet chamber 6.

[0052] In this way, when special circumstances require, such as when the alloy needs to contain multiple trace (or small) alloying elements and each trace (or small) alloying element needs to react with the basic alloy to generate different intermediates and avoid mutual reaction between trace (or small) elements, each small chamber can be used for independent wire feeding and smelting, and then the melt can be controlled to mix at a certain rate and proportion to obtain a more reasonable or required specific proportion of components, and finally better control and improve the performance of the casting alloy. In addition, for example, if it is necessary to prepare an alloy containing multiple primary phases at the same time, each small chamber can be used for wire feeding and smelting at different rates to obtain an alloy melt with different components, and then cooled to a certain temperature to obtain a solid-liquid two-phase melt (including a primary precipitation phase and a liquid phase), and then the melt is controlled to mix at a certain rate and proportion to obtain an alloy melt with two different primary phases at the same time, and then an alloy containing two different primary phases at the same time is obtained, which can effectively regulate the structure and properties of the casting alloy. When this control requirement is not required, using multiple small chambers to feed and mix the same metal wire separately can also improve the mixing and stirring effect of the metal wire and the basic melt after feeding, and improve the smelting effect. When the amount of alloy melt to be prepared is small, only one small chamber may be activated to prepare the alloy melt of a certain required composition in a single thread.

[0053] The hatch cover 4 extends into the top of the liquid outlet tank 6 and leaves a hole for controlling the up and down movement of the liquid outlet gate 21. In this way, it is convenient to keep the liquid outlet tank warm and avoid air intrusion.

[0054] The bottom plate of the liquid outlet tank 6 is arranged lower than the bottom plate of the forming tank 5 and a guide slope 23 is arranged on the side adjacent to the forming tank and connected with the liquid outlet hole 20 of the forming tank.

[0055] In this way, after the liquid is discharged from the liquid discharge chamber, it falls down along the guide slope into the liquid discharge chamber, which facilitates further sufficient mixing of the molten liquid during the falling process (especially when each small chamber is fed with wire for smelting separately).

[0056] The upper surface of the guide slope 23 is upwardly protruding and provided with two groups of guide plates 24 arranged in an X-staggered array, and each guide plate 24 is vacant at the intersection point.

[0057] In this way, after the liquid is discharged from the liquid outlet holes of each small chamber, it will flow downward along the X-staggered guide plates. Since the guide plates are left vacant at the intersection points, the molten liquid can be diverted to both sides again after flowing through the intersection points. In this way, the molten liquid is continuously bifurcated and reorganized during the flow process to achieve full mixing, which greatly improves the further full mixing of the molten liquid after the wire is fed into each small chamber (especially when the wire is fed and smelted separately in each small chamber).

[0058] Among them, a corresponding plug 25 is arranged at the upper end of the liquid outlet channel 7, and a vertical rod 26 is fixedly arranged upward on the plug 25. The vertical rod can slide up and down through the hatch cover and is connected to a horizontally arranged control lever 27. The fulcrum of the control lever is hinged at the upper end of the liquid outlet side of the liquid outlet tank. In this way, the outflow speed of the mixed alloy melt can be controlled by operating the plug with the control lever, and the flow rate can be flexibly adjusted according to production needs. Reducing the melt outflow speed can extend the mixing time between the components and improve the melt uniformity, and increasing the melt outflow speed can improve production efficiency. It is convenient to realize liquid outflow control.

[0059] Among them, the extraction and pressure control device includes an exhaust pipe 42 and an injection pipe 43, one end of which is connected to the upper end of the extraction and injection pipe 40, and the other end of the injection pipe 43 is connected to a compressed gas tank 46 after an injection electric control valve 44 and a barometer 45 are arranged in series. The other end of the exhaust pipe 42 is connected to an exhaust pump 48 after an exhaust electric control valve 47 is arranged in series. The injection electric control valve 44, the barometer 45, the exhaust electric control valve 47 and the exhaust pump 48 are respectively connected to the control center 49. A control module is arranged in the control center 49 for realizing the opening and closing of the injection electric control valve 47 of the compressed gas tank and the switching control of the exhaust electric control valve 47 and the exhaust pump 48.

[0060] In this way, when the compressed gas tank's gas injection electric control valve is closed, the gas extraction electric control valve and the gas extraction pump are opened, so that the gas injection pipe stops working and the gas extraction pipe extracts gas from the extraction pipe to form a negative pressure, so that the molten liquid is sucked into the extraction pipe from the extraction port; then the compressed gas tank's gas injection electric control valve is switched to open, and the gas extraction electric control valve and / or the gas extraction pump are controlled to close at the same time, so that the gas extraction pipe stops working and the gas injection pipe injects gas into the extraction pipe to form a positive pressure, so that the molten liquid in the extraction pipe is pressed out from the extraction port back into the molten liquid pool. This repeated cycle switching is used to control the extraction action of the extraction pipe, so that the molten liquid is repeatedly sucked into the extraction pipe and injected, achieving a mixing and stirring effect on the solution.

[0061] The control module of the control center 49 is also provided with a timing control program, which is used to control the pumping tubes on both sides to synchronously perform pumping actions for several rounds, and then control the pumping tubes on both sides to alternately perform pumping actions for several rounds and repeat this cycle.

[0062] In this way, since the injection port of the injection pipe is set downward, in the process of the injection pipes on both sides performing the injection action synchronously, when sucking the molten liquid, the lower layer of the molten liquid can be sucked into the injection pipe by rapid suction, and the upper layer of the molten liquid can be stopped when it drops to the vicinity of the injection port; then, when the molten liquid in the injection pipe is pressed back, the molten liquid can be slowly injected to make it flow back to the top of the molten pool, so as to realize the up and down exchange flow of the molten liquid in the molten pool. Then, in the process of the injection pipes on both sides performing the injection action alternately, when the injection pipe on one side sucks the solution, the injection pipe on the other side correspondingly presses out the molten liquid, so as to realize the repeated flow of the molten liquid in the horizontal direction in the molten pool. Therefore, this control method can realize the repeated exchange flow control of the molten liquid in the vertical and horizontal directions successively, greatly improving the stirring control effect of the molten liquid, and overcoming the defects of the blade stirring method that easily leads to uneven stirring and the generation of gaps in the molten liquid.

[0063] The gas in the compressed gas tank 46 is refined gas (argon gas), so as to better achieve gas protection.

[0064] In the process of controlling the pumping and injection of the pumping and injection tube 40 by the control module, the volume of the pumping and injection is smaller than the volume of the injection.

[0065] This way, the injection volume is larger, which can better press out the molten metal sucked into the injection pipe during suction, avoiding the molten metal from adhering to the inner wall of the injection pipe. At the same time, part of the refined gas can be directly pressed into the molten pool during injection, further improving the dehydrogenation effect of gas refining while stirring and mixing.

[0066] Among them, the upper end of each extraction tube 40 is also provided with a lifting control mechanism connected thereto.

[0067] In this way, by controlling the lifting and lowering of the pumping tube, the exchange and stirring effect of the upper and lower layer solutions in the solution pool can be better assisted.

[0068] The lifting control mechanism is installed on the upper surface of the supporting top plate, and the pumping pipe 40 can slide up and down through the hatch cover and the supporting top plate and is connected to the lifting mechanism, so that installation and control can be easily realized.

[0069] The lifting mechanism includes a vertically arranged telescopic electric cylinder 50, a telescopic head 51 of the telescopic electric cylinder 50 is fixed to the pumping pipe 40 through a horizontal connecting beam, and a motor of the telescopic electric cylinder is connected to a control center, so that installation and control can be realized conveniently.

[0070] Among them, the outer wall of the injection tube and the upper end of the inner cavity wall are each installed with a downward ultrasonic liquid level detector 52, and the ultrasonic liquid level detector 52 is connected to the control center 49. In this way, the liquid level inside and outside the injection tube can be monitored in real time, which better assists in achieving control.

[0071] The outer wall of the pumping tube 40 is also provided with an electric heating device, so as to conveniently heat the inside of the pumping tube.

Claims

1. A method for stirring molten metal by pumping, characterized in that: The part of the molten metal to be stirred in the molten metal pool is sucked into a containing space connected to the molten metal pool by suction, and then the sucked molten metal is pressed back into the molten metal pool by injection to complete the stirring and mixing of the molten metal.

2. The method for stirring molten metal by pumping according to claim 1, characterized in that: During injection, refined gas is used as the gas source for injection, and the volume of injection is controlled to be larger than the volume of suction.

3. The method for stirring molten metal by pumping according to claim 1, characterized in that: The refining gas used during injection molding is argon.

4. The method for stirring molten metal by pumping according to claim 1, characterized in that: This method relies on a pumping stirring device, which includes two vertically arranged pumping pipes, which are made of high-temperature resistant materials. The two pumping pipes are arranged horizontally opposite to each other, and a pumping port is opened at the lower end of the pumping pipe and is located in the molten metal pool to be stirred. The upper end of the pumping pipe is connected to a pumping pressure control device.

5. The method for stirring molten metal by pumping according to claim 4, characterized in that: The suction and pressure control device includes an air suction pipe and an air injection pipe, one end of which is connected to the upper end of the extraction and injection pipe, the other end of the air injection pipe is connected to a compressed gas tank after an air injection electric control valve and a barometer are arranged in series, and the other end of the air suction pipe is connected to an air suction electric control valve and an air suction pump in series. The air injection electric control valve, the barometer, the air suction electric control valve and the air suction pump are respectively connected to a control center. A control module is arranged in the control center for realizing the switching control of the opening and closing of the air injection electric control valve of the compressed gas tank and the opening and closing of the air suction electric control valve and the air suction pump.

6. The method for stirring molten metal by pumping according to claim 5, characterized in that: The control module of the control center is also provided with a timing control program, which is used to control the pumping tubes on both sides to perform pumping actions synchronously for several rounds, and then control the pumping tubes on both sides to perform pumping actions alternately for several rounds and repeat this cycle.

7. The method for stirring molten metal by pumping according to claim 4, characterized in that: The gas in the compressed gas tank is refined argon gas.

8. The method for stirring molten metal by pumping according to claim 7, characterized in that: During the process of controlling the extraction and injection of the extraction and injection tube by the control module, the volume of the suction is smaller than the volume of the pressure injection.

9. The method for stirring molten metal by pumping according to claim 4, characterized in that: The upper end of each extraction pipe is also respectively provided with a lifting control mechanism connected thereto.

10. The method for stirring molten metal by pumping according to claim 9, characterized in that: The lifting mechanism comprises a telescopic electric cylinder arranged vertically, the telescopic head of the telescopic electric cylinder is fixed to the pumping pipe through a horizontal connecting beam, and the motor of the telescopic electric cylinder is connected to the control center; An ultrasonic liquid level detector facing downward is installed on the outer wall of the injection pipe and the upper end of the inner cavity wall, and the ultrasonic liquid level detector is connected to the control center; The outer wall of the pumping tube is also provided with an electric heating device.

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