A middle material taking quantitative soup stove with impeller rotating speed controlling internal liquid path

Abstract

The application discloses a middle material taking quantitative soup furnace with impeller rotating speed controlling internal liquid path, which is internally divided into a molten material chamber, a purification chamber and a soup feeding chamber, and is provided with liquid gate A and liquid gate B between the chambers; the purification chamber is internally vertically provided with an impeller shaft, and a small impeller and a large impeller are installed on the impeller shaft. The small impeller is fixedly connected with the impeller shaft, and the large impeller can vertically slide on the impeller shaft. By controlling the rotating speed of the impeller shaft, the opening and closing of the liquid gate A and the liquid gate B are linked and controlled, and then the flowing path of the alloy liquid in the soup furnace is controlled, so that the alloy liquid in the soup furnace is output to a die casting machine after being purified for five times, so as to meet the requirements of high purity and low gas content of raw materials for an integrated die casting. The device has the advantages of simple control, low cost, high integration and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to mechanical equipment technology, and in particular to a middle material taking quantitative soup furnace with impeller rotating speed control internal liquid path. BACKGROUND

[0002] New energy vehicle body, chassis and other key components are developing towards thin-walled, high-performance and large-scale. In recent years, integrated die casting technology has been developed, which uses a large die casting machine to replace a large number of small parts with a single large aluminum casting, which can not only improve the endurance mileage of electric vehicles, but also reduce manufacturing costs.

[0003] Compared with traditional die casting technology, the quality of alloy liquid is very strict. This is because some small slag particles or pores will not have a significant impact on traditional die castings, but will cause integrated die castings to fail and break. Especially for large-area, complex structure integrated die castings, part scrap often means huge economic losses. Therefore, it is urgent to develop a device that can greatly improve the quality of alloy liquid.

[0004] The early die casting machine soup feeding device adopts "upper material taking" and "upper material pouring" working mode, which is composed of a soup ladle, a connecting rod mechanism and a chain transmission mechanism. Its working process is that the connecting rod mechanism drives the soup ladle to the specified position, and then the chain transmission mechanism rotates the soup ladle to scoop up the alloy liquid from the surface of the alloy liquid, and then the soup ladle is turned out of the melting pool. Then, the soup ladle is further moved above the feeding port of the die casting machine, and the alloy liquid is poured into the die casting machine by controlling the side turning of the soup ladle. In recent years, "lower soup material feeding" and "lower soup material pouring" feeding mode has been developed: taking soup from the middle and lower part of the alloy liquid to avoid taking slag floating on the surface of the alloy liquid, improve the purity of the material taking, and further improve the processing quality of the die castings. By sealing the storage of alloy liquid, the alloy liquid can be further improved in quality during transportation.

[0005] Based on the above, the measures taken to obtain high-quality alloy liquid are:

[0006] 1) Purification: Through the purification process, the gas or inclusions in the alloy liquid are removed;

[0007] 2) Optimize material taking: Take material from below the surface of the alloy liquid to avoid floating slag and oxides into the casting cavity;

[0008] 3) Optimize transportation: Use a closed container to avoid oxidation and contamination of the alloy liquid during transportation.

[0009] The existing products and technologies have the following problems in realizing the above measures:

[0010] 1) The number of alloy liquid purification is limited, which cannot further improve the quality;

[0011] 2) Equipment volume, complex structure, high energy consumption;

[0012] 3) Equipment internal control complex, high cost, poor stability. SUMMARY

[0013] Poor alloy liquid quality directly leads to the decline of the integrated die casting forming piece qualified rate. In view of this problem, the intermediate material taking quantitative feeding furnace for controlling the internal liquid path of the impeller rotating speed can significantly improve the quality of the output alloy liquid, the overall structure is more compact, and the unit energy consumption is lower. In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0014] 1) The feeding furnace is divided into a melting material chamber, a purification chamber and a feeding chamber, and the device has higher integration;

[0015] 2) The alloy liquid output from the feeding furnace is purified five times to further meet the requirements of high purity and low gas content of the raw material for integrated die casting;

[0016] 3) The melting material chamber, the purification chamber and the feeding chamber can be kept independent and adjusted in communication in time, so that the purified alloy liquid is not contaminated by the un-purified alloy liquid;

[0017] 4) By controlling the rotating speed of the impeller shaft, the opening and closing of the two liquid doors in the feeding furnace can be linked and controlled, and then the flow path of the alloy liquid in the feeding furnace can be controlled; the internal control operation is simple, and the cost is low and the reliability is high.

[0018] The specific scheme adopted by the present application is:

[0019] The internal feeding furnace includes a melting material chamber, a purification chamber and a feeding chamber; a liquid door A is arranged between the melting material chamber and the purification chamber, and a liquid door B is arranged between the purification chamber and the feeding chamber; the opening and closing state of the liquid door A and the liquid door B determines whether the alloy liquid flows between the two adjacent chambers; the opening and closing state of the liquid door A and the liquid door B is controlled by the impeller shaft module in the purification chamber. The melting material chamber includes: a stop block A, an alloy liquid A, a furnace body, a heat source, an inlet cover, an inlet, a barrier furnace body, a channel A and a liquid door A; the purification chamber includes: a stop block B, an alloy liquid B, a positioning hole, a belt drive module, an upper cover, an exhaust hole, an exhaust pipe, a liquid door B and an impeller shaft module; the feeding chamber includes: a material taking tank, an alloy liquid C, a material taking port, a plunger rod, an air cylinder, an air inlet, an inert gas inlet pipe, a liquid lifting pipe, an electromagnetic pump and a liquid conveying pipe.

[0020] The bottom of the material taking tank is provided with a material taking port, a plunger rod and an air cylinder fixedly connected with the plunger rod are vertically arranged above the material taking port; the air cylinder is installed on the top surface of the top of the material taking tank; when the air cylinder is in the elongated state, the plunger rod closes the material taking port; when the air cylinder is in the shortened state, the plunger rod opens the material taking port;

[0021] The die casting machine works continuously, and consumes the alloy liquid C in the material taking tank. When the material taking tank needs to be replenished with alloy liquid C, the material taking port is opened. When the soup chamber needs to be replenished with alloy liquid, the motor is switched to the low speed gear to rotate, the liquid door A is closed, and the liquid door B is opened. When the purification chamber needs to be replenished with alloy liquid, the motor is switched to the high speed gear to rotate, the liquid door A is opened, and the liquid door B is closed. At the same time, the solid alloy raw material is replenished into the melting material chamber. The above process realizes that the soup furnace continuously and quantitatively inputs high-quality alloy liquid C to the die casting machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall layout of the device of the application;

[0023] Figure 2 It is a schematic diagram of the structure of the melting material chamber;

[0024] Figure 3 It is a schematic diagram of the structure of the purification chamber;

[0025] Figure 4 It is a schematic diagram of the structure of the impeller shaft module of the purification chamber;

[0026] Figure 5 It is a schematic diagram of the structure of the soup chamber;

[0027] Figure 6 It is a schematic diagram of the working process of the device of the application;

[0028] Figure 7 It is a schematic diagram of the switching state of the device;

[0029] Figure 8 It is a schematic diagram of the overall layout of the improved device;

[0030] 1. Melting material chamber; 11. Stop block A; 12. Alloy liquid A; 13. Furnace body; 14. Heat source; 15. Feeding cover; 16. Feeding port; 17. Blocking furnace body; 18. Passage A; 19. Liquid door A;

[0031] 3. Purification chamber; 31. Stop block B; 32. Alloy liquid B; 33. Positioning hole; 34. Belt drive module; 35. Upper cover; 36. Exhaust hole; 37. Exhaust pipe; 38. Passage B; 39. Liquid door B;

[0032] 40. Impeller shaft module; 41. Impeller shaft; 42. Bearing; 43. Pulley; 44. Small impeller; 45. Large impeller; 46. Motor;

[0033] 5. Soup chamber; 51. Material taking tank; 52. Alloy liquid C; 53. Material taking port; 54. Plunger rod; 55. Air cylinder; 56. Air inlet hole; 57. Inert gas inlet pipe; 58. Liquid lifting pipe; 59. Electromagnetic pump; 60. Liquid conveying pipe; 70. Counterweight block. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. This application can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing the following specific embodiments is to facilitate a clearer and more thorough understanding of the disclosure of this application; wherein terms indicating direction such as up, down, left, and right refer only to the position of the shown structure in the corresponding drawings.

[0035] Example 1.

[0036] like Figure 1 As shown, the present invention proposes an intermediate feeding furnace for controlling the internal liquid path of the impeller speed, comprising three chambers arranged in sequence: a melting chamber 1, a purification chamber 3, and a feeding chamber 5; a liquid gate A19 is provided between the melting chamber 1 and the purification chamber 3, and a liquid gate B39 is provided between the purification chamber 3 and the feeding chamber 5; the opening and closing states of the liquid gates A19 and B39 determine whether the alloy liquid can flow between the two adjacent chambers.

[0037] The melting chamber 1 utilizes the heat source 14 within the molten metal furnace to melt the solid alloy raw material into molten alloy A12. The molten alloy A12 in the lower part of the melting chamber 1 flows into the purification chamber 3. The purification chamber 3 purifies and degasses the molten alloy A, transforming it into molten alloy B32. The molten alloy B32 in the lower part of the purification chamber 3 flows into the molten metal furnace 5. The molten metal furnace 5 further purifies the molten alloy and simultaneously feeds a fixed amount of molten alloy C53 into the die-casting machine at intervals according to the volume of the cast parts. The opening and closing of the liquid flow channel between the melting chamber 1 and the purification chamber 3 is controlled by a liquid valve A19; the opening and closing of the liquid flow channel between the purification chamber 3 and the molten metal furnace 5 is controlled by a liquid valve B39.

[0038] Both liquid gate A19 and liquid gate B39 include a door leaf and a rotating shaft; the rotating shaft and the door leaf are located on the same plane, the rotating shaft is horizontally arranged and located in the middle of the door leaf; the door leaf is subjected to hydraulic force and rotates around the rotating shaft.

[0039] like Figure 2 As shown, the melting chamber 1 includes: a baffle A11, molten alloy A12, a furnace body 13, a heat source 14, a feed cover 15, a feed inlet 16, a barrier furnace body 17, a channel A18, and a liquid gate A19. The feed inlet 16 is located on the upper part of the furnace body 13. Solid alloy raw materials are placed into the melting chamber 1 through the feed inlet 16, and then the feed cover 15 is closed. The heat source 14 heats the solid alloy raw materials to melt them into molten alloy A12. The barrier furnace body 17 is vertically arranged, and it forms a horizontal fluid channel A18 with the furnace body 13 on the lower bottom surface inside the furnace. A liquid gate A19 is provided on the channel A18 and rotates around a fixed axis. A baffle A11 is connected to the lower bottom surface of the barrier furnace body 17, and the baffle A11 restricts the liquid gate A19 to rotate only in a specific direction.

[0040] As shown in Figure 3 The purification chamber 3 includes: a block B31, an alloy liquid B32, a positioning hole 33, a belt drive module 34, an upper cover 35, an exhaust hole 36, an exhaust pipe 37, a liquid door B39 and an impeller shaft module 40. The upper cover 35 covers the top surface of the purification chamber 3, and the exhaust hole 36 connected with the exhaust pipe 37 is formed in the upper cover 35; the impeller shaft module 40 is vertically installed on the upper cover 35, and the lower end of the impeller shaft module 40 is inserted into the positioning hole 33 in the bottom of the furnace body 13, and the upper end of the impeller shaft module 40 is exposed from the upper cover 35.

[0041] As shown in Figure 4 The impeller shaft module 40 includes: an impeller shaft 41, a bearing 42, a belt wheel 43, a small impeller 44, a large impeller 45 and a motor 46. The impeller shaft 41 is assembled on the bearing through the bearing 42, and the bearing is fixedly installed on the upper cover 35; the belt wheel 43 is fixedly installed on the end of the impeller shaft 41 extending out of the purification chamber 3; the motor 46 transmits its rotary motion to the belt wheel 43 through the belt drive, and then drives the impeller shaft 41 to rotate; the part of the impeller shaft 41 inside the purification chamber 3 is sequentially provided with the large impeller 45 and a plurality of small impellers 44 from bottom to top, wherein the large impeller 45 is matched with the impeller shaft 41 through the spline, and the small impeller 44 is fixedly connected with the impeller shaft 41; the length of the outer spline on the impeller shaft 41 is greater than the length of the inner spline of the large impeller 45 in the axial direction, so that the large impeller 45 can vertically slide on the impeller shaft 41.

[0042] As shown in Figure 5 The soup feeding chamber 5 includes: a material taking tank 51, an alloy liquid C52, a material taking port 53, a plunger rod 54, an air cylinder 55, an air inlet hole 56, an inert gas inlet pipe 57, a liquid lifting pipe 58, an electromagnetic pump 59 and a liquid conveying pipe 60. The material taking tank 51 is located at the upper part of the soup feeding chamber 5, and the bottom surface of the material taking tank 51 and the furnace body 13 form a horizontal fluid passage B38 below the soup feeding furnace; the passage B38 is provided with a liquid door B39 rotating around a fixed rotating shaft; the block B31 is fixedly connected to the outer bottom surface of the material taking tank 51, and the liquid door B39 is limited to rotate in a specific direction through the block B31. The material taking tank 51 is a closed container, and the electromagnetic pump 59 is arranged inside the material taking tank 51; the electromagnetic pump 59 is located above the liquid surface of the alloy liquid C52, the liquid inlet of the electromagnetic pump 59 is connected with one end of the liquid lifting pipe 58, and the other end of the liquid lifting pipe 58 is located below the liquid surface of the alloy liquid C52; the liquid outlet of the electromagnetic pump 59 is connected with one end of the liquid conveying pipe 60, and the other end of the liquid conveying pipe 60 is connected with the barrel of the die casting machine; the air inlet hole 56 is located at the top of the material taking tank 51, and the inert gas inlet pipe 57 is connected with the air inlet hole 56; the material taking port 53 is arranged at the bottom of the material taking tank 51, and the plunger rod 54 is vertically arranged above the material taking port 53; the air cylinder 55 is coaxially fixedly connected with the plunger rod 54; the air cylinder 55 is installed on the top surface of the material taking tank 51; when the air cylinder 55 is in the elongated state, the plunger rod 54 closes the material taking port 53; when the air cylinder 55 is in the shortened state, the plunger rod 54 opens the material taking port 53.

[0043] AsFigure 6 and Figure 7 The working flow of the device is shown in the following:

[0044] Step 1: The melting chamber 1 melts the solid alloy raw material into alloy liquid A12; the motor 46 stops, and the alloy liquid A12 flows into the melting chamber 1, the purification chamber 3 and the feeding chamber 5 under the action of its own gravity; Figure 7 Top left

[0045] Step 2: The motor 46 rotates at high speed, driving the large impeller 45 to rotate at high speed; the alloy liquid B32 generates a reaction force on the large impeller 45, and under the cooperation of the inner spline and the outer spline, the large impeller 45 floats up with the rising of the liquid surface of the alloy liquid A12; during this period, the refining agent is added to the purification chamber 3 to remove hydrogen and oxide inclusions in the alloy liquid A12, obtaining the purified alloy liquid B32;

[0046] Step 3: The rotating movement of the large impeller 45 accelerates the alloy liquid B32, generating a horizontal flow; the highest point of the outer spline of the impeller shaft 41 is flush with the upper edges of the liquid gate A19 and the liquid gate B39; when the large impeller 45 floats to the highest point along the outer spline of the impeller shaft 41, the horizontal flow generated by the rotation of the large impeller 45 opens the liquid gate A19 and closes the liquid gate B39; Figure 7 Top right

[0047] Step 4: The solid alloy raw material is continuously added to the melting chamber 1, while the large impeller 45 keeps rotating at high speed and the purification chamber 3 keeps the continuous purification process; during this process, the alloy liquid surface of the melting chamber 1 and the purification chamber 3 gradually rises; the gas generated in the purification process is discharged through the exhaust pipe 37; Figure 7 Bottom right

[0048] Step 5: The motor 46 switches to low speed, at this time the reaction force of the alloy liquid B32 on the large impeller 45 is not enough to make the large impeller 45 float up, so the large impeller 45 drops to the lowest point of the outer spline of the impeller shaft 41, which is flush with the lower edges of the liquid gate A19 and the liquid gate B39; the horizontal flow generated by the rotation of the large impeller 45 closes the liquid gate A19 and opens the liquid gate B39 at the same time; the alloy liquid B32 in the purification chamber 3 flows into the feeding chamber 5, while the gas cylinder 55 shortens, driving the plunger rod 54 to open the material taking port 53; the alloy liquid C52 enters the inside of the material taking tank 51.( Figure 7 Bottom left

[0049] The low speed and high speed of the motor 46 are measured by experiment, and the minimum requirement of the speed is to ensure that the large impeller 45 rises or drops as expected, and to control the opening or closing of the liquid gate A19 and the liquid gate B39 as expected.

[0050] The die casting machine works continuously, and needs to consume the alloy liquid C52 in the material taking tank 51 constantly; when the material taking tank 51 needs to be replenished with the alloy liquid C52, the material taking port 53 is opened; when the soup chamber 5 needs to be replenished with the alloy liquid, the motor 46 is switched to the low speed gear to rotate, the liquid door A19 is closed, and the liquid door B39 is opened at the same time; when the purification chamber 3 needs to be replenished with the alloy liquid, the motor 46 is switched to the high speed gear to rotate, the liquid door A19 is opened, and the liquid door B39 is closed; at the same time, the solid alloy raw material is replenished into the melting material chamber 1. Figure 7 The upper right graph

[0051] In the above process, the alloy liquid A12 in the melting material chamber 1 enters the purification chamber 3 through the channel A18, because the channel A18 is below the melting material chamber 1, the dross in the alloy liquid A12 cannot enter the purification chamber 3, and the first purification of the alloy liquid is realized; then, the alloy liquid A12 in the purification chamber 3 is stirred, degassed and impurity-removed, the second purification of the alloy liquid is realized, and the alloy liquid B32 is generated; then, the alloy liquid B32 in the purification chamber 3 enters the soup chamber 5 through the channel B38 below, and the third purification of the alloy liquid is realized; because the material taking tank 51 takes the material from the middle of the soup chamber 5, the alloy liquid entering the material taking tank 51 is subjected to the fourth purification, the impurity dross is further reduced, and becomes the alloy liquid C52; the inert gas, such as argon and nitrogen, enters the inside of the material taking tank 51 through the inert gas inlet pipe 57, and ensures that the alloy liquid C52 is no longer in contact with the air; the electromagnetic pump 59 pumps out the alloy liquid C52 below the liquid surface by using the rising pipe 58, and inputs the alloy liquid C52 into the die casting machine barrel through the liquid conveying pipe 60, so that the fifth purification of the alloy liquid is realized.

[0052] Example two.

[0053] Example two has the same effect as example one, but the structure is improved.

[0054] As shown in the drawings, Figure 8 The first improvement of example two is that the counterweight 70 is arranged on the side of the liquid door A19 and the liquid door B39 close to the soup chamber 5; the mass of the counterweight 70 is equal to 0.7×the maximum liquid level difference between the two sides of the liquid door×the density of the alloy liquid×the acceleration of gravity. The first function of the counterweight 70 is to help the liquid door A19 and the liquid door B39 return to the original position, so as to avoid the situation that the liquid door A19 and the liquid door B39 cannot return to the original position due to excessive opening; the second function of the counterweight on the liquid door B39 is to balance the pressure of the alloy liquid A12 in the melting material chamber 1 on it; because the liquid level of the melting material chamber 1 is the highest among the three chambers, if the liquid level difference between the melting material chamber 1 and the purification chamber 3 is large, the large impeller 45 rotating at the low speed gear may not be able to generate a horizontal flow beam with sufficient strength to close the liquid door A19.

[0055] The second improvement of the second embodiment is that an electric heating rod and a thermocouple sensor are arranged inside the material taking tank 51, and a thermocouple sensor is arranged at the end of the liquid delivery pipe 60. During the continuous die casting process, the temperature of the alloy liquid C52 inside the material taking tank 51 and at the end of the liquid delivery pipe 60 is monitored in real time. When the factory environment temperature drops, the above device realizes temperature compensation of the alloy liquid. For example, when it is night, if the temperature of the alloy liquid C52 at the end of the liquid delivery pipe 60 is detected to be 5 degrees Celsius lower than the preset temperature, the electric heating rod is turned on to make the temperature of the alloy liquid C52 inside the material taking tank 51 rise. When the temperature of the alloy liquid at the end of the liquid delivery pipe 60 is detected to reach the preset temperature, the electric heating rod is turned off. Further, when the temperature difference between the alloy liquid C52 inside the material taking tank 51 and the preset temperature is less than 2 degrees Celsius, the electric heating rod is turned on and off at a specific frequency, for example, 10 seconds on and 10 seconds off, to avoid temperature overshoot.

[0056] The second embodiment further specifies the materials of the device of the application. Preferably, the material taking tank 51 is a ceramic material, the liquid gate A19 and the liquid gate B39 and their rotating shafts are nickel-based alloy materials, and the furnace body 13 is a heat-resistant and heat-insulating material. The metal liquid can be one of an aluminum alloy, an aluminum-magnesium alloy and a copper alloy.

Claims

1. A boiler for intermediate material feeding and metering in an internal liquid circuit controlled by impeller speed, characterized in that: It comprises three chambers arranged in sequence: a molten material chamber (1), a purification chamber (3) and a soup feeding chamber (5); a liquid gate A (19) is arranged between the molten material chamber (1) and the purification chamber (3), and a liquid gate B (39) is arranged between the purification chamber (3) and the soup feeding chamber (5); The opening and closing states of the liquid gate A (19) and the liquid gate B (39) determine whether the alloy liquid can flow between the two adjacent chambers; the liquid gate A (19) and the liquid gate B (39) each comprise a door leaf and a rotating shaft; the rotating shaft and the door leaf are located in the same plane, the rotating shaft is horizontally arranged and located in the middle of the door leaf; the door leaf is subjected to liquid force and rotates around the rotating shaft; The molten material chamber (1) comprises a stop block A (11), alloy liquid A (12), a furnace body (13), a heat source (14), a feeding cover (15), a feeding port (16), a blocking furnace body (17), a channel A (18) and the liquid gate A (19); the feeding port (16) is located at the upper part of the furnace body (13), and the feeding cover (15) is located above the feeding port (16); the heat source (14) heats the solid alloy raw material to make it melt into the alloy liquid A (12); the blocking furnace body (17) is vertically arranged, and forms a horizontal fluid channel A (18) with the lower bottom surface of the furnace body (13) inside the soup feeding furnace; the liquid gate A (19) rotating around a fixed rotating shaft is arranged on the channel A (18); the stop block A (11) is connected to the lower bottom surface of the blocking furnace body (17), and the liquid gate A (19) can only rotate in a specific direction through the stop block A (11); The purification chamber (3) comprises a stop block B (31), alloy liquid B (32), a positioning hole (33), a belt drive module (34), an upper cover (35), an exhaust hole (36), an exhaust pipe (37), the liquid gate B (39) and an impeller shaft module (40); the upper cover (35) covers the top surface of the purification chamber (3), and the exhaust hole (36) connected to the exhaust pipe (37) is formed in the upper cover (35); the impeller shaft module (40) is vertically installed on the upper cover (35), the lower end of the impeller shaft module (40) is inserted into the positioning hole (33) at the bottom of the furnace body (13), and the upper end of the impeller shaft module (40) is exposed from the upper cover (35); The soup feeding chamber (5) comprises a material taking tank (51), alloy liquid C (52), a material taking port (53), a plunger rod (54), a gas cylinder (55), an air inlet hole (56), an inert gas inlet pipe (57), a liquid lifting pipe (58), an electromagnetic pump (59) and a liquid conveying pipe (60); the material taking tank (51) is located at the upper part of the soup feeding chamber (5), and the bottom surface of the material taking tank (51) and the furnace body (13) form a horizontal fluid channel B (38) below the soup feeding furnace inside; the liquid gate B (39) rotating around a fixed rotating shaft is arranged on the channel B (38); the stop block B (31) is fixedly connected to the outer bottom surface of the material taking tank (51), and the liquid gate B (39) can only rotate in a specific direction through the stop block B (31). The impeller shaft module (40) comprises an impeller shaft (41), a bearing (42), a belt wheel (43), a small impeller (44), a large impeller (45) and a motor (46); the impeller shaft (41) is assembled on the bearing through the bearing (42), and the bearing is fixedly installed on the upper cover (35); the belt wheel (43) is fixedly installed on the end of the impeller shaft (41) extending out of the purification chamber (3); the motor (46) drives the impeller shaft (41) to rotate through belt transmission; the part of the impeller shaft (41) inside the purification chamber (3) is sequentially provided with the large impeller (45) and a plurality of small impellers (44) from bottom to top, wherein the large impeller (45) is matched with the impeller shaft (41) through a spline, and the small impeller (44) is fixedly connected with the impeller shaft (41); the length of the outer spline on the impeller shaft (41) is greater than the length of the axial inner spline of the large impeller (45), so that the large impeller (45) can vertically slide on the impeller shaft (41).

2. The intermediate material taking quantitative soup furnace with the impeller rotating speed controlling internal liquid path according to claim 1, characterized in that: The material taking tank (51) is a closed container, and an electromagnetic pump (59) is arranged in the material taking tank (51); the electromagnetic pump (59) is located above the liquid level of the alloy liquid C (52), the inlet of the electromagnetic pump (59) is connected with one end of a liquid lifting pipe (58), and the other end of the liquid lifting pipe (58) is located below the liquid level of the alloy liquid C (52); the outlet of the electromagnetic pump (59) is connected with one end of a liquid conveying pipe (60), and the other end of the liquid conveying pipe (60) is connected with a cylinder of a die casting machine; an air inlet hole (56) is located on the top of the material taking tank (51), and the air inlet hole (56) is connected with an inert gas inlet pipe (57); a material taking opening (53) is arranged on the bottom of the material taking tank (51), and a plunger rod (54) is vertically arranged above the material taking opening (53); a cylinder (55) is coaxially and fixedly connected with the plunger rod (54); the cylinder (55) is arranged on the top surface of the top of the material taking tank (51); An electric heating rod and a thermocouple sensor are arranged in the material taking tank (51); a thermocouple sensor is arranged at the die casting machine end of the liquid conveying pipe (60).

3. The intermediate material taking quantitative soup stove with impeller rotating speed controlling internal liquid path according to claim 1, characterized in that: Counterweight blocks (70) are arranged on the sides of the liquid gate A (19) and the liquid gate B (39) close to the soup feeding chamber (5); the mass of the counterweight blocks (70) is equal to 0.7×the maximum liquid level difference between the two sides of the liquid gate×the density of the alloy liquid×the acceleration of gravity.

4. A method of soup feeding using the intermediate soup taking quantitative soup stove with the internal liquid path of the impeller rotating speed control according to any one of claims 1-3, characterized in that: The method comprises steps A)-E) A) The solid alloy raw material is phase changed and melted into the alloy liquid A (12) in the melting material chamber (1); the motor (46) is stopped, and the alloy liquid A (12) flows into the melting material chamber (1), the purification chamber (3) and the soup feeding chamber (5) under the action of gravity; B) The motor (46) is rotated at high speed to drive the large impeller (45) to rotate at high speed; the alloy liquid B (32) generates a reaction force on the large impeller (45), and the large impeller (45) floats up with the increase of the liquid level of the alloy liquid A (12) under the cooperation of the inner spline and the outer spline; during this period, a refining agent is added into the purification chamber (3) to remove hydrogen and oxide inclusions in the alloy liquid A (12), and the purified alloy liquid B (32) is obtained; C) The rotating movement of the large impeller (45) accelerates the alloy liquid B (32) and generates a horizontal flow; the highest point of the outer spline of the impeller shaft (41) is level with the upper edges of the liquid gates A (19) and B (39); when the large impeller (45) floats to the highest point along the outer spline of the impeller shaft (41), the horizontal flow generated by the rotation of the large impeller (45) opens the liquid gate A (19) and closes the liquid gate B (39); D) The solid alloy raw material is continuously placed into the melting chamber (1), while the large impeller (45) keeps rotating at high speed, and the purification chamber (3) keeps the continuous purification process; in this process, the alloy liquid level of the melting chamber (1) and the purification chamber (3) gradually rises; the gas generated by the purification process is discharged through the exhaust pipe (37); E) The motor (46) switches to low-speed rotation; at this time, the reaction force of the alloy liquid B (32) on the large impeller (45) is not enough to make the large impeller (45) float, so the large impeller (45) drops to the lowest point of the outer spline of the impeller shaft (41), which is level with the lower edges of the liquid gates A (19) and B (39); the horizontal flow generated by the rotation of the large impeller (45) closes the liquid gate A (19) and opens the liquid gate B (39); the alloy liquid B (32) in the purification chamber (3) flows into the feeding chamber (5), while the gas cylinder (55) shortens and drives the plunger rod (54) to open the material taking port (53); the alloy liquid C (52) enters the inside of the material taking tank (51); When the material taking tank (51) needs to be replenished with alloy liquid C (52), the material taking port (53) is opened; when the feeding chamber (5) needs to be replenished with alloy liquid, the motor (46) switches to low-speed rotation, which closes the liquid gate A (19) and opens the liquid gate B (39); when the purification chamber (3) needs to be replenished with alloy liquid, the motor (46) switches to high-speed rotation, which opens the liquid gate A (19) and closes the liquid gate B (39); at the same time, the solid alloy raw material is replenished and placed into the melting chamber (1).

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