A stirring device for vacuum gas atomization smelting

Abstract

The utility model relates to the technical field of vacuum air atomization powder making, and specifically to a stirring device for vacuum air atomization smelting, comprising a fixing frame with side walls and a top wall, the bottom of the fixing frame being connected to a vacuum bin, a lifting assembly being rotatably installed between the top wall of the fixing frame and the top of the vacuum bin, the lifting assembly being movably connected to a stirring assembly for stirring molten metal, one end of the stirring assembly penetrating a sealing bearing arranged on the top of the vacuum bin and then extending into the vacuum bin, the vacuum bin being connected to a vacuum melting furnace via a plug valve arranged at the bottom of the vacuum bin, when stirring is required, the lifting assembly drives the stirring assembly downward through the plug valve and into the vacuum melting furnace, thereby solving the problems in the prior art that the stirring assembly is not easy to replace and replacement will affect the oxygen content and impurity content of the metal powder and the service life of the stirring assembly is short, thereby improving work efficiency, reducing production and operation costs, and ensuring stable product quality of the metal powder.

Description

Technical Field

[0001] The utility model relates to a stirring device for vacuum air atomization smelting, belonging to the technical field of vacuum air atomization powder making. Background Art

[0002] In order to obtain metal powders with high purity, low impurity content, regular shape and low oxygen content, vacuum gas atomization technology is often used to prepare metal powders. Its working principle is: in a vacuum environment, after the metal is melted and refined in a smelting furnace, a high-pressure airflow is used to spray the metal liquid into aerosol, and then it is rapidly cooled and solidified into powder under vacuum conditions. In the existing metal powder making process, a physical stirring component is added to the vacuum smelting chamber to promote the uniformity of the metal melt composition. The utility model patent with publication number CN206624907U discloses a crucible lifting vacuum smelting furnace, including a crucible composite device and a lifting platform system, a stirring device and a lifting platform system, a feeding device, a vacuum system, a handheld liftable thermocouple, a sealing system, and an electric control system. The crucible composite device of the crucible composite device and the lifting platform system is installed on its lifting platform system to realize vertical up and down lifting; the stirring device is installed on its lifting platform system to realize vertical up and down lifting; the crucible composite device and the feeding device are connected by a vacuum system system connection; the stirring device and the lower end of the handheld liftable thermocouple can be inserted into the graphite crucible; the lifting operation and temperature control of all devices are controlled by the electric control system in the electric control cabinet; the sealing system is used to ensure that the entire furnace body maintains a good vacuum state; however, in the actual production and preparation process, it is found that there are major drawbacks. First, when different stirring heads need to be replaced according to different process requirements or when the stirring head is damaged, because the prior art is to place the stirring head in the smelting furnace, the smelting furnace must be shut down before replacement and then replaced, resulting in the stirring component being difficult to replace, which seriously affects the work efficiency, and because the smelting furnace must be stopped for replacement, the vacuum state in the smelting furnace will be destroyed, affecting the oxygen content and impurity content of the metal powder, further affecting the work efficiency and product quality, secondly, because of the high temperature environment in the smelting furnace, the service life of the stirring component that has been in the smelting furnace is shortened, increasing the production and operation costs, and thirdly, the stirring component in the prior art has low stirring efficiency and long stirring time, which further affects the work efficiency. Utility Model Content

[0003] The utility model aims at the deficiencies in the prior art and provides a stirring device for vacuum gas atomization smelting.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a stirring device for vacuum gas atomization smelting, comprising a fixed frame with side walls and a top wall, the bottom of the fixed frame is connected to a vacuum bin, a lifting assembly is rotatably installed between the top wall of the fixed frame and the top of the vacuum bin, the lifting assembly is movably connected to a stirring assembly for stirring molten metal, one end of the stirring assembly penetrates through a sealed bearing arranged on the top of the vacuum bin and then extends into the vacuum bin, and the vacuum bin is connected to a vacuum smelting furnace via a plug valve arranged at the bottom of the vacuum bin.

[0005] Furthermore, an opening is provided on the side of the vacuum chamber, and one side of the opening is hinged to a sealing door for covering the opening. The sealing door is sealed and fixed to the vacuum chamber by a locking bolt arranged on the vacuum chamber. The vacuum chamber is also provided with a vacuum pump connection port and a vacuum breaking valve for destroying the vacuum.

[0006] Furthermore, a groove is provided on the inner side of the sealing door, and a sealing ring is provided in the groove.

[0007] Furthermore, the outer surface of the sealing door is provided with reinforcing ribs.

[0008] Furthermore, the stirring assembly includes a connecting plate, a driving mechanism is arranged on the upper side of the connecting plate, an output end of the driving mechanism is connected to a driving shaft, the driving shaft sequentially passes through a bearing arranged on the connecting plate and a sealed bearing arranged on the top of the vacuum chamber and then enters the vacuum chamber, and one end of the driving shaft entering the vacuum chamber is detachably connected to a stirring rod.

[0009] Furthermore, the stirring assembly also includes an auxiliary shaft arranged parallel to the active shaft, one end of the auxiliary shaft is arranged on the lower side of the connecting plate, the other end of the auxiliary shaft passes through a sealed bearing arranged on the top of the vacuum chamber and enters the vacuum chamber, and one end of the auxiliary shaft entering the vacuum chamber is connected to a detachable baffle.

[0010] Furthermore, the driving shaft is threadedly connected to the stirring rod, and the auxiliary shaft is threadedly connected to the baffle.

[0011] Furthermore, the baffle plate is an arc-shaped plate structure, and a protruding arc-shaped side of the baffle plate is arranged toward the stirring rod.

[0012] Furthermore, the lifting assembly includes a screw rod, one end of which is connected to the output shaft of a driving motor arranged on the upper side of the top wall of the fixed frame, and the other end of the screw rod passes through a nut arranged on one end of the connecting plate close to the side wall of the fixed frame, and is rotatably installed on the top of the vacuum chamber, and the rising and falling of the connecting plate are achieved by the forward and reverse rotation of the screw rod.

[0013] Furthermore, one end of the moving block is connected to the connecting plate, the other end of the moving block is provided with a sliding block, and the side wall of the fixing frame is provided with a sliding groove that cooperates with the sliding block.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects:

[0015] (1) The vacuum chamber, lifting assembly and stirring assembly provided in the utility model are coordinated to solve the problem that the stirring assembly is placed in the smelting furnace in the prior art, which makes the stirring assembly difficult to replace. When replacing, the vacuum state is destroyed, affecting the oxygen content and impurity content of the metal powder, and the stirring head is in a high temperature environment for a long time, resulting in a short service life. The utility model improves work efficiency, reduces production and operation costs, and ensures the stable product quality of the metal powder.

[0016] (2) The stirring assembly provided in the utility model solves the problems of low stirring efficiency and long stirring time of the stirring assembly in the prior art, thereby improving the work efficiency and stirring effect and enhancing the uniformity of the metal components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the assembly of an embodiment of the utility model;

[0018] Figure 2 This is a rear view of an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the state without a sealed door in the embodiment of the utility model;

[0020] Figure 4 This is an enlarged view of the position of Example A of the utility model;

[0021] Figure 5 This is a schematic cross-sectional view of a baffle plate according to an embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of the inner side of the sealed door according to an embodiment of the utility model.

[0023] The meanings of the marks in the figure are as follows: 1. Fixed frame; 2. Vacuum chamber; 3. Lifting assembly; 4. Stirring assembly; 5. Gate valve; 6. Vacuum melting furnace; 21. Sealing door; 22. Locking bolt; 23. Vacuum pump connection port; 24. Breaking valve; 31. Screw; 32. Driving motor; 33. Nut; 34. Sliding block; 35. Slide; 41. Connecting plate; 42. Driving mechanism; 43. Active shaft; 44. Stirring rod; 45. Auxiliary shaft; 46. Baffle plate; 211. Sealing ring; 212. Reinforcing rib. DETAILED DESCRIPTION

[0024] The following is a detailed description of the specific implementation of the utility model. The utility model can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used are only for describing specific implementations and are not intended to limit the present invention.

[0026] like Figure 1 As shown, a stirring device for vacuum gas atomization smelting comprises a fixed frame 1 for installing a lifting component 3, the fixed frame 1 comprises a top wall and a side wall, the top wall is fixedly connected to the side wall, a guard plate for improving the supporting capacity of the fixed frame 1 is connected between the top wall and the side wall, the bottom end of the fixed frame 1 is detachably connected to a vacuum chamber 2 that can maintain a vacuum state, a lifting component 3 is rotatably installed between the top wall of the fixed frame 1 and the top upper surface of the vacuum chamber 2, preferably, the lifting component 3 is vertically installed between the fixed frame 1 and the vacuum chamber 2, the lifting component 3 is movably connected to a stirring component 4 for stirring the molten metal, and one end of the stirring component 4 penetrates through a sealed bearing vertically arranged on the top of the vacuum chamber 2 and extends into the internal space of the vacuum chamber 2, the lifting component 3 is arranged parallel to the stirring component 4, and the bottom of the vacuum chamber 2 is opened at a position directly opposite to the stirring component 4 There is an opening for accommodating the passage of the stirring component 4, and the position of the opening on the outer surface of the bottom of the vacuum bin 2 is detachably connected to a plug valve 5, which can of course also be other valves that can form a through channel after being opened. Preferably, a sealing gasket is installed on the connecting end face of the plug valve 5 and the vacuum bin 2, and the other side of the plug valve 5 connected to the vacuum bin 2 is detachably connected to the vacuum melting furnace 6. Preferably, a sealing gasket is installed on the connecting end face of the plug valve 5 and the vacuum melting furnace 6, and the connection and cutoff between the vacuum bin 2 and the vacuum melting furnace 6 are achieved by switching the plug valve 5. When it is necessary to stir the molten metal, the lifting assembly 3 moves downward to drive the stirring assembly 4 to move downward through the plug valve 5 and then enter the crucible of the vacuum melting furnace 6. When it is not necessary to stir the molten metal, the lifting mechanism moves upward to drive the stirring assembly 4 to move upward back to the vacuum bin 2.

[0027] Specifically, the vacuum chamber 2 is hollow inside and has an opening on the side, and a sealing door 21 is detachably installed on one side of the opening. Preferably, the sealing door 21 is hinged on one side of the opening of the vacuum chamber 2, and locking blocks are fixedly installed on both sides of the sealing door 21. Locking bolts 22 are fixedly installed on the vacuum chamber 2 at positions relative to the locking blocks. When the sealing door 21 is closed, the sealing door is sealed and fixed to the vacuum chamber 2 through the locking bolts 22; a groove is provided on the inner side of the sealing door 21 close to the vacuum chamber 2, and the groove is arranged around the edge of the sealing door 21, and a sealing ring 211 is detachably installed in the groove. A vacuum pump connecting port 23 is provided on the main body of the vacuum chamber 2, and a sealing gasket is installed on the connecting end face of the vacuum pump and the connecting port. Connecting the vacuum pump is used to achieve the vacuum state of the vacuum chamber 2, and a venting valve 24 is also installed on the main body of the vacuum chamber 2. A sealing gasket is installed on the connecting end face of the venting valve 24 and the main body of the vacuum chamber 2, and the venting valve 24 is used to destroy the vacuum state of the vacuum chamber 2. When the stirring assembly 4 needs to be replaced, the lifting assembly 3 drives the stirring assembly 4 to move upward back to the vacuum chamber 2, and then the gate valve 5 is closed, and the connection between the vacuum chamber 2 and the vacuum melting furnace 6 is cut off to ensure that the vacuum state in the vacuum melting furnace 6 is not affected. Next, the vacuum state of the vacuum chamber 2 is destroyed by the breaker valve 24, and then the sealing door 21 is opened to replace the stirring assembly 4.

[0028] Specifically, the outer surface of the sealing door 21 is integrally formed with reinforcing ribs 212. Preferably, the outer surface of the vacuum chamber 2 may also be provided with reinforcing ribs 212. The reinforcing ribs 212 are in a Japanese shape to form a grid-like reinforcement structure, which not only improves the operating safety of the vacuum chamber 2, but also reduces the weight of the vacuum chamber 2 and improves stability while ensuring safety.

[0029] Specifically, the stirring assembly 4 includes a connecting plate 41, a bracket is installed on the upper side of the connecting plate 41, and a driving mechanism 42 is detachably installed on the bracket. The driving mechanism 42 can be driven by an internal combustion engine, an electric drive or a hydraulic drive, preferably an electric drive. The output shaft of the driving mechanism 42 is detachably connected to the driving shaft 43, and the other end of the driving shaft 43 successively penetrates the bearings vertically arranged on the connecting plate 41 for support and guidance and the sealed bearings vertically arranged on the top of the vacuum chamber 2 for sealing and guiding, and then extends into the internal space of the vacuum chamber 2. The driving shaft 43 enters the vacuum chamber 2 and is detachably connected to the stirring rod 44 at one end. Preferably, the driving mechanism 42 can drive the driving shaft 43 to rotate forward and reverse, and the driving shaft 43 is connected to the stirring rod 44 by threads. The stirring rod 44 is made of graphite. Furthermore, the output shaft of the driving mechanism 42, the driving shaft 43, the stirring rod 44 and the center of the crucible of the vacuum melting furnace 6 are coaxially arranged.

[0030] Specifically, the stirring assembly 4 also includes an auxiliary shaft 45, which is arranged parallel to the driving shaft 43, one end of the auxiliary shaft 45 is detachably connected to the lower surface of the connecting plate 41, and the other end passes through a sealing bearing vertically arranged on the top of the vacuum chamber 2 for sealing and guiding, and then extends into the internal space of the vacuum chamber 2. One end of the auxiliary shaft 45 entering the vacuum chamber 2 is detachably connected to a baffle plate 46, and preferably, the baffle plate 46 is made of graphite. The length of the auxiliary shaft 45 extending into the vacuum chamber 2 after connecting to the baffle plate 46 is the same as the length of the driving shaft 43 extending into the vacuum chamber 2 after connecting to the stirring rod 44. The auxiliary shaft 45 is connected to the baffle plate 46 by threads and the two are coaxially arranged;

[0031] Specifically, the baffle plate 46 is an arc-shaped plate structure, and the protruding arc-shaped side is arranged toward the stirring rod 44. When stirring starts, the driving shaft 43 drives the stirring rod 44 to rotate, and the stirring rod 44 drives the molten metal to flow. When the molten metal flows through the baffle plate 46, because the baffle plate 46 is arranged as an arc-shaped structure, the flow rate on the protruding side is greater than the flow rate on the concave side. According to Bernoulli's principle, the greater the flow rate, the smaller the pressure. Therefore, under the pressure of the concave side, the molten metal accelerates to move toward the center direction of the stirring rod 44, further improving the stirring effect and improving the uniformity of the molten metal composition.

[0032] Specifically, the lifting assembly 3 includes a screw rod 31 rotatably installed between the top wall of the fixed frame 1 and the top of the vacuum chamber 2, the screw rod 31 is arranged parallel to the driving shaft 43 and the auxiliary shaft 45, one end of the screw rod 31 is connected to the output shaft of the driving motor 32 located on the upper side of the top wall of the fixed frame 1, and the driving motor 32 is preferably a forward and reverse motor, and the driving motor 32 is detachably connected and fixed to the bracket installed on the upper side of the top wall of the fixed frame 1, and the other end of the screw rod 31 successively penetrates the bearing vertically arranged on the top wall of the fixed frame 1 for support and guidance and the nut 33 vertically arranged on the connecting plate 41 near one end of the side wall of the fixed frame 1, and then rotates to install Installed on the top of the vacuum bin 2, the screw rod 31 is adapted to the nut 33, and the driving motor 32 drives the screw rod 31 to rotate forward and backward to realize the rising and falling of the connecting plate 41. The connecting plate 41 is connected to a slider 34 at one end close to the side wall of the fixing frame 1, and a slide groove 35 is fixedly installed on the side wall of the fixing frame 1. The slide groove 35 cooperates with the slider 34 to realize up and down sliding. Preferably, a groove is provided on the slider 34, and the connecting plate 41 is inserted into the groove provided on the slider 34. By arranging the slider 34 and the slide groove 35 at one end of the connecting plate 41, the stability of the lifting mechanism driving the stirring mechanism to move can be improved.

[0033] Specific implementation process: when stirring is required, the vacuum chamber 2 is evacuated by a vacuum pump to reach the same vacuum degree as the vacuum melting furnace 6, and then the gate valve 5 is opened to connect the vacuum chamber 2 with the vacuum melting furnace 6. When the lifting component 3 rotates to drive the stirring component 4 downward to a predetermined distance, the lifting component 3 stops moving. At this time, the stirring component 4 is located in the crucible of the vacuum melting furnace 6. Then the stirring component 4 rotates to stir the melt. When the stirring is completed or it is found that the stirring effect does not meet the requirements and a stirring head of another shape needs to be replaced, the lifting component 3 rotates to drive the stirring component 4 upward back to the vacuum chamber 2, and then the gate valve 5 is closed to cut off the connection between the vacuum chamber 2 and the vacuum melting furnace 6 to ensure that the vacuum state in the vacuum melting furnace 6 is not affected. Next, the vacuum state of the vacuum chamber 2 is destroyed by the air-breaking valve 24, and then the sealing door 21 is opened to replace the required stirring head. After the replacement is completed, the sealing door 21 is closed, and the vacuum valve and the vacuum pump are opened to evacuate the vacuum chamber 2. When the vacuum degree of the vacuum chamber 2 is the same as that of the vacuum melting furnace 6, the gate valve 5 is opened, and the above actions are repeated for stirring.

[0034] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. The protection scope of the utility model shall be based on the attached claims.

Claims

1. A stirring device for vacuum gas atomization smelting, characterized in that: The invention comprises a fixed frame (1) having a side wall and a top wall, the bottom of the fixed frame (1) being connected to a vacuum chamber (2), a lifting assembly (3) being rotatably mounted between the top wall of the fixed frame (1) and the top of the vacuum chamber (2), the lifting assembly (3) being movably connected to a stirring assembly (4) for stirring molten metal, one end of the stirring assembly (4) passing through a sealing bearing arranged at the top of the vacuum chamber (2) and then extending into the vacuum chamber (2), and the vacuum chamber (2) being connected to a vacuum melting furnace (6) via a gate valve (5) arranged at the bottom of the vacuum chamber (2).

2. A stirring device for vacuum gas atomization smelting according to claim 1, characterized in that: The vacuum chamber (2) is provided with an opening on a side, and a sealing door (21) is hinged on one side of the opening for covering the opening. The sealing door (21) is sealed and fixed to the vacuum chamber (2) via a locking bolt (22) provided on the vacuum chamber (2). The vacuum chamber (2) is also provided with a vacuum pump connection port (23) and a vacuum breaking valve (24) for breaking the vacuum.

3. A stirring device for vacuum gas atomization smelting according to claim 2, characterized in that: A groove is provided on the inner side of the sealing door (21), and a sealing ring (211) is arranged in the groove.

4. A stirring device for vacuum gas atomization smelting according to claim 3, characterized in that: The outer surface of the sealing door (21) is provided with reinforcing ribs (212).

5. The stirring device for vacuum gas atomization smelting according to claim 1, characterized in that: The stirring assembly (4) comprises a connecting plate (41), a driving mechanism (42) is arranged on the upper side of the connecting plate (41), the output end of the driving mechanism (42) is connected to a driving shaft (43), the driving shaft (43) sequentially penetrates a bearing arranged on the connecting plate (41) and a sealing bearing arranged on the top of the vacuum chamber (2) and then enters the vacuum chamber (2), and one end of the driving shaft (43) entering the vacuum chamber (2) is detachably connected to a stirring rod (44).

6. A stirring device for vacuum gas atomization smelting according to claim 5, characterized in that: The stirring assembly (4) further comprises an auxiliary shaft (45) arranged in parallel with the driving shaft (43); one end of the auxiliary shaft (45) is arranged on the lower side of the connecting plate (41); the other end of the auxiliary shaft (45) penetrates through a sealing bearing arranged on the top of the vacuum chamber (2) and enters the vacuum chamber (2); one end of the auxiliary shaft (45) entering the vacuum chamber (2) is connected to a detachable baffle plate (46).

7. A stirring device for vacuum gas atomization smelting according to claim 6, characterized in that: The driving shaft (43) is threadedly connected to the stirring rod (44), and the auxiliary shaft (45) is threadedly connected to the baffle plate (46).

8. A stirring device for vacuum gas atomization smelting according to claim 6, characterized in that: The baffle plate (46) is an arc-shaped plate structure, and the protruding arc-shaped side of the baffle plate (46) is arranged toward the stirring rod (44).

9. A stirring device for vacuum gas atomization smelting according to claim 5, characterized in that: The lifting assembly (3) comprises a screw rod (31), one end of which is connected to an output shaft of a driving motor (32) arranged on the upper side of the top wall of the fixing frame (1), and the other end of the screw rod (31) passes through a nut (33) arranged on one end of the side wall of the connecting plate (41) close to the fixing frame (1), and is rotatably mounted on the top of the vacuum chamber (2), so that the connecting plate (41) can be raised and lowered by the forward and reverse rotation of the screw rod (31).

10. A stirring device for vacuum gas atomization smelting according to claim 9, characterized in that: One end of the connecting plate (41) is connected to a sliding block (34), and a sliding groove (35) cooperating with the sliding block (34) is provided on the side wall of the fixing frame (1).

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