Impurity removal device for lead-bismuth alloy smelting

Abstract

The utility model discloses an impurity removal device for lead-bismuth alloy smelting, and relates to the technical field of lead-bismuth alloy processing. The impurity removing device comprises a shell, an impurity removing assembly is arranged in the shell, and a feeding assembly is further arranged on the top of the shell. The impurity removal assembly comprises a plurality of mounting frames which are fixedly connected to the inner side of the shell at equal intervals from top to bottom, filter plates are fixedly connected to the inner sides of the mounting frames, preheating pipes are fixedly connected to the interiors of supporting arms of the mounting frames, and the two ends of each preheating pipe fixedly communicate with a first connecting pipe and a second connecting pipe correspondingly. According to the device, the mounting frame and the filter plate are preheated through the preheating pipe, the inner side of the shell is preheated through the coiled pipe, the problem that the temperature of an existing molten metal liquid is reduced in the impurity removal process is solved, meanwhile, the feeding pipe and the flow dividing shell are driven by the moving frame to rotate in a reciprocating mode, and the impurity removal efficiency is improved. The problem that existing impurity removal efficiency is poor is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead-bismuth alloy processing, in particular to an impurity removal device for lead-bismuth alloy smelting. Background Art

[0002] Lead-bismuth alloy, also known as a low-temperature alloy, is primarily composed of lead and bismuth, both of which have low melting points. It is a new, environmentally friendly alloy that appears as a silvery-white solid at room temperature and has strong permeability. It is widely used in printing, cast iron, alarm systems, and other applications. The production and processing of lead-bismuth alloy typically involves smelting, and during this process, impurities may appear in the molten metal. To improve its quality, impurity removal equipment is generally used to filter and remove impurities from the molten metal.

[0003] The document with the existing announcement number CN221673663U discloses a metal smelting impurity removal and filtering device, which includes a main body, a hinge fixedly connected to one side of the main body, a sealing door fixedly connected to one side of the hinge, a rotating rod fixedly connected to one side of the sealing door, a buckle rotatably connected to the outer wall of the rotating rod, and a slot clamped on the outer wall of the buckle; a primary filter plate, a secondary filter plate, and a high-level filter plate are clamped inside the main body, and a handle is provided on one side of each of the primary filter plate, the secondary filter plate, and the high-level filter plate;

[0004] However, it still has the following disadvantages in actual use:

[0005] The metal smelting impurity removal filtering device mentioned above has a primary filter plate, a secondary filter plate and a high-level filter plate clamped inside its main body, and the molten metal liquid is filtered and impurities are removed in multiple stages by the primary filter plate, the secondary filter plate and the high-level filter plate. However, during use, due to the large temperature difference between the primary filter plate, the secondary filter plate and the high-level filter plate and the molten metal liquid, the molten metal liquid suffers from heat loss, thereby affecting the subsequent processing process;

[0006] The metal smelting impurity removal and filtering device mentioned above has a movable hinge fixedly connected to one side of the main body of the device, and a sealing door fixed to one end of the movable hinge. The molten metal liquid is added to the main body by opening and closing the sealing door. However, during use, the added metal liquid will be concentrated in local positions of the primary filter plate, the intermediate filter plate and the advanced filter plate, resulting in low filtration efficiency and poor impurity removal effect.

[0007] To this end, we provide a lead-bismuth alloy smelting impurity removal device to solve the above problems. Utility Model Content

[0008] The purpose of the utility model is to provide an impurity removal device for lead-bismuth alloy smelting, which preheats the mounting frame and filter plate through a preheating tube and preheats the inner side of the outer shell through a serpentine tube, thereby solving the problem of the temperature of the molten metal liquid being reduced during the impurity removal process of the existing molten metal liquid. At the same time, the movable frame drives the feeding pipe and the diversion shell to rotate back and forth, thereby solving the problem of poor impurity removal efficiency of the existing molten metal liquid.

[0009] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0010] The utility model is an impurity removal device for lead-bismuth alloy smelting, comprising a shell, an impurity removal component is arranged inside the shell, and a feeding component is also arranged on the top of the shell;

[0011] The impurity removal component includes a plurality of mounting frames fixedly connected to the inner side of the shell at equal intervals from top to bottom, the inner sides of the mounting frames are fixedly connected to filter plates, the support arms of the mounting frames are fixedly connected to a preheating pipe, both ends of the preheating pipe are fixedly connected to a first connecting pipe and a second connecting pipe, an end of the first connecting pipe away from the preheating pipe passes through the front end surface of the heating box located on the outer wall of one side of the shell and is fixedly connected to an air collecting hood, the air collecting hood is located inside the heating box, an end of the second connecting pipe away from the preheating pipe is fixedly connected to the front end surface of the air outlet box located on the outer wall of the other side of the shell, the front and rear ends of the inner side of the shell are fixedly connected to a serpentine pipe, both ends of the serpentine pipe are fixedly connected to the air outlet box, and a plurality of fins are equally spaced on the serpentine pipe;

[0012] The feeding assembly includes a U-shaped frame fixedly connected to one side of the top of the outer shell, and a feeding pipe is rotatably connected to one side of the U-shaped frame. The bottom end of the feeding pipe rotates through the top of the outer shell and is fixedly connected to a diverter shell. The bottom of the diverter shell is provided with multiple discharge ports at equal intervals along the horizontal direction. The top of the feeding pipe is movably connected to a hopper, and a driving gear is sleeved on the outer wall of the feeding pipe. A moving frame is movably connected to the upper inner part of the U-shaped frame, and a second rack is fixedly connected to the outer wall of one side of the moving frame, and the driving gear and the second rack are engaged with each other.

[0013] The utility model is further configured as follows: a plurality of L-shaped frames are fixedly connected to the inner walls on both sides of the shell at equal intervals along the vertical direction, the tops of the L-shaped frames respectively abut against the two sides of the bottom of the installation frame, and a discharge pipe passes through the bottom of the shell.

[0014] The utility model is further configured as follows: the front end face of the mounting frame passes through the front end face of the shell and extends to the outer front end of the shell, both sides of the front end face of the mounting frame are fixedly connected to rotating shafts, rotating plates are sleeved on the rotating shafts, through grooves are provided on the upper and lower end faces of the rotating plates, a plurality of mounting rods are welded on the front end face of the shell, the front ends of the mounting rods pass through the through grooves and are threaded with fastening nuts.

[0015] The utility model is further configured as follows: a plurality of filters are fixedly connected to the rear end of the interior of the heating box at equal intervals in the longitudinal direction; an air inlet pipe runs through the rear end surface of the heating box; and an air inlet valve is fixedly connected to the rear end of the air inlet pipe.

[0016] The utility model is further configured as follows: an air outlet pipe runs through the bottom of the air outlet box, and an air outlet valve is fixedly connected to the bottom end of the air outlet pipe.

[0017] The utility model is further configured as follows: sliding rods are fixedly connected to both sides of the upper inner side of the U-shaped frame, the longitudinal support arms of the movable frame are slidably sleeved on the sliding rods, and return springs are fixedly connected to the front and rear end surfaces of the inner side of the U-shaped frame, and the end of the return spring away from the inner side of the U-shaped frame is fixedly connected to the transverse support arms of the movable frame.

[0018] The utility model is further configured as follows: a driving motor is fixedly connected to the inner center position of the U-shaped frame, a half gear is sleeved on the output shaft of the driving motor, and a first rack is fixedly connected to the inner walls on both sides of the movable frame, and the first rack and the half gear are meshed with each other.

[0019] The utility model is further configured as follows: the top end of the feeding pipe is connected to a third connecting pipe via a rotary joint, and the top end of the third connecting pipe passes through the bottom of the hopper and extends to the lower inner side of the hopper.

[0020] The utility model has the following beneficial effects:

[0021] The utility model provides an impurity removal component, and the high-temperature exhaust gas in the smelting furnace enters the preheating pipe through the heating box and the first connecting pipe, and heats the mounting frame and the filter plate through the preheating pipe, and the high-temperature exhaust gas in the preheating pipe enters the air outlet box, and the high-temperature exhaust gas circulates between the air outlet box and the serpentine pipe, and then further heats and insulates the interior of the shell through the serpentine pipe and the fins, thereby preheating the filter plate and other structures, avoiding the low temperature in the shell resulting in a large heat loss of the molten metal liquid, and facilitating the impurity removal of the molten metal liquid.

[0022] The utility model sets a feeding component, starts the driving motor, and the output shaft of the driving motor drives the half gear to rotate, and under the action of the mutual engagement between the half gear and the first rack, the movable frame and the second rack perform a linear reciprocating motion in the longitudinal direction. At the same time, under the action of the mutual engagement between the driving gear and the second rack, the feeding pipe drives the diverter shell to rotate back and forth inside the outer shell. At this time, the molten metal liquid in the hopper is evenly distributed on the filtering structure in the outer shell through the discharge port, avoiding the molten metal liquid from being concentrated in a certain part of the filtering structure, thereby improving the impurity removal effect of the molten metal liquid.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The figure is a schematic diagram of the overall structure of an impurity removal device used for smelting lead-bismuth alloy.

[0026] Figure 2 It is a side sectional view of the housing of the utility model.

[0027] Figure 3 It is a structural schematic diagram of the impurity removal component of the utility model.

[0028] Figure 4 This is a structural disassembly diagram of the installation frame of the utility model.

[0029] Figure 5 This is a structural diagram of the preheating tube of the utility model.

[0030] Figure 6 It is a side sectional view of the heating box of the present invention.

[0031] Figure 7 This is a schematic diagram of the installation between the air outlet box and the serpentine pipe of the utility model.

[0032] Figure 8 It is a structural schematic diagram of the feeding component of the utility model.

[0033] Figure 9 This is a structural disassembly diagram of the U-shaped frame of the utility model.

[0034] Figure 10 This is a schematic structural diagram of the feeding pipe of the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1-housing, 101-L-shaped frame, 102-mounting rod, 103-fastening nut, 104-discharge pipe, 2-impurity removal component, 201-mounting frame, 201a-rotating shaft, 201b-rotating plate, 201c-through slot, 202-filter plate, 203-preheating pipe, 203a-first connecting pipe, 203b-second connecting pipe, 203c-air collecting cover, 204-heating box, 204a-filter screen, 204b-air inlet pipe, 204c-air inlet valve, 205-air outlet box, 205a- Outlet pipe, 205b-outlet valve, 206-serpentine pipe, 206a-fin, 3-feeding assembly, 301-U-shaped frame, 301a-slide rod, 301b-drive motor, 301c-half gear, 302-feeding pipe, 302a-rotating joint, 302b-drive gear, 303-diverter shell, 303a-discharge port, 304-hopper, 304a-third connecting pipe, 305-moving frame, 305a-reset spring, 305b-first rack, 305c-second rack. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0038] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown in the figure, the first embodiment of the present invention provides an impurity removal device for lead-bismuth alloy smelting, comprising a housing 1, an impurity removal assembly 2 disposed inside the housing 1, the impurity removal assembly 2 comprising a mounting frame 201, a filter plate 202, a preheating pipe 203, a heating box 204, an air outlet box 205, and a serpentine pipe 206. The mounting frame 201 and the filter plate 202 are preheated by the preheating pipe 203, and the interior of the housing 1 is heated by the serpentine pipe 206, thereby solving the problem of a serious temperature drop of the molten metal liquid during the impurity removal process in the prior art.

[0039] Specifically, the mounting frame 201 is provided with multiple fixed connections at equal intervals from top to bottom on the inner side of the housing 1. The inner sides of the mounting frame 201 are fixedly connected with filter plates 202. The support arms of the mounting frame 201 are fixedly connected with preheating pipes 203. The two ends of the preheating pipes 203 are fixedly connected with a first connecting pipe 203a and a second connecting pipe 203b. The end of the first connecting pipe 203a away from the preheating pipe 203 passes through the front end surface of the heating box 204 located on the outer wall of one side of the housing 1 and is fixedly connected with the wind collecting cover 203. 03c, the wind collecting cover 203c is located inside the heating box 204, and the end of the second connecting pipe 203b away from the preheating pipe 203 is fixedly connected to the front end surface of the air outlet box 205 located on the outer wall of the other side of the shell 1. The front and rear ends of the inner side of the shell 1 are fixedly connected with a serpentine pipe 206, and both ends of the serpentine pipe 206 are fixedly connected to the air outlet box 205. A plurality of fins 206a are evenly spaced on the serpentine pipe 206. The setting of the installation frame 201 is used to install the filter plate 202 in the shell 1. The filter plate 202 The device is used to remove impurities from the molten metal liquid. The preheating pipe 203 is used to heat the installation frame 201 and the filter plate 202, so that the temperature of the installation frame 201 and the filter plate 202 is close to the temperature of the molten metal liquid, reducing the heat exchange between the liquid and the installation frame 201 and the filter plate 202. The first connecting pipe 203a and the second connecting pipe 203b are used to connect the preheating pipe 203 with the heating box 204 and the air outlet box 205. The air collecting cover 203c is convenient for connecting the heating box The hot air in 204 is introduced into the first connecting pipe 203a, and the heating box 204 is connected to the tail gas pipe of the smelting furnace, so that the filter plate 202 and other structures are heated by means of the high-temperature tail gas of the smelting furnace. The air outlet box 205 is connected to the tail gas treatment device of the smelting furnace. The setting of the air outlet box 205 is used to introduce the tail gas of the smelting furnace into the tail gas treatment device for treatment. The setting of the serpentine tube 206 is used to preheat the internal space of the outer shell 1, thereby further reducing the heat loss of the molten metal liquid in the outer shell 1.

[0040] Furthermore, multiple L-shaped frames 101 are fixedly connected to the inner walls of both sides of the housing 1 at equal intervals in the vertical direction. The tops of the L-shaped frames 101 respectively abut against the bottom sides of the mounting frame 201. A discharge pipe 104 penetrates the bottom of the housing 1.

[0041] The front end of the mounting frame 201 passes through the front end of the housing 1 and extends to the outer front end of the housing 1. A rotating shaft 201a is fixedly connected to both sides of the front end of the mounting frame 201. A rotating plate 201b is sleeved on the rotating shaft 201a. A through slot 201c is formed on the upper and lower end surfaces of the rotating plate 201b. A plurality of mounting rods 102 are welded to the front end of the housing 1. The front ends of the mounting rods 102 pass through the through slots 201c and are threadedly sleeved with fastening nuts 103.

[0042] The rear end of the heating box 204 is fixedly connected to a plurality of filters 204a at equal intervals along the longitudinal direction. An air inlet pipe 204b runs through the rear end surface of the heating box 204, and an air inlet valve 204c is fixedly connected to the rear end of the air inlet pipe 204b.

[0043] An air outlet pipe 205a runs through the bottom of the air outlet box 205, and an air outlet valve 205b is fixedly connected to the bottom end of the air outlet pipe 205a.

[0044] The operation process of this embodiment is as follows: first, the air inlet pipe 204b of the heating box 204 is connected to the tail gas pipe of the smelting furnace through the air inlet valve 204c, and the air outlet pipe 205a of the air outlet box 205 is connected to the tail gas treatment device through the air outlet valve 205b, so that the high-temperature tail gas in the smelting furnace passes through the heating box 204 and the first connecting pipe 203a into the preheating pipe 203, and the installation frame 201 and the filter plate 202 are heated by the preheating pipe 203, and the inside of the preheating pipe 203 is heated. The high-temperature exhaust gas enters the air outlet box 205, and circulates between the air outlet box 205 and the serpentine tube 206, and then further heats and insulates the interior of the shell 1 through the serpentine tube 206 and the fins 206a, thereby preheating the filter plate 202 and other structures. Finally, the molten lead-bismuth metal liquid is added to the shell 1, and the molten metal liquid is removed by the filter plate 202. At the same time, the air outlet valve 205b is opened to allow the high-temperature exhaust gas to enter the exhaust gas treatment device for treatment. Example 2

[0045] See also Figure 1 、 Figure 8 、 Figure 9 and Figure 10 As shown, this is the second embodiment of the present invention, which is based on the previous embodiment, but is different from the previous embodiment in that a feeding assembly 3 is further provided on the top of the shell 1, and the feeding assembly 3 includes a U-shaped frame 301, a feeding pipe 302, a diverter shell 303, a hopper 304 and a moving frame 305. The feeding pipe 302 and the diverter shell 303 are driven to rotate back and forth by the moving frame 305, so that the molten metal liquid is evenly distributed on the filtering structure through the diverter shell 303, thereby solving the problem of poor impurity removal effect in the existing system.

[0046] Specifically, the U-shaped frame 301 is fixedly connected to one side of the top of the shell 1, and one side of the U-shaped frame 301 is rotatably connected to a feeding pipe 302. The bottom end of the feeding pipe 302 rotates through the top of the shell 1 and is fixedly connected to a diverter shell 303. The bottom of the diverter shell 303 is provided with multiple discharge ports 303a at equal intervals in the horizontal direction. The top of the feeding pipe 302 is movably connected to a hopper 304. A driving gear 302b is sleeved on the outer wall of the feeding pipe 302. A moving frame 305 is movably connected to the upper part of the U-shaped frame 301. A second rack 305c is fixedly connected to the outer wall of one side of the moving frame 305. The driving gear 302b is connected to the second rack The racks 305c are meshed with each other. The U-shaped frame 301 is used to install structures such as the feeding pipe 302 and the moving frame 305. The feeding pipe 302 is used to add molten metal liquid into the outer shell 1 for impurities removal. The diverter shell 303 and the discharge port 303a are used to divert the molten metal liquid. The hopper 304 is used to provide molten metal liquid to the feeding pipe 302. The moving frame 305 is used to drive the second rack 305c to perform reciprocating linear motion. The coordinated setting of the driving gear 302b and the second rack 305c realizes the reciprocating rotational motion of the feeding pipe 302.

[0047] Furthermore, sliding rods 301a are fixedly connected to both sides of the upper inner side of the U-shaped frame 301, and the longitudinal arms of the movable frame 305 are slidably mounted on the sliding rods 301a. Return springs 305a are fixedly connected to the front and rear end surfaces of the inner side of the U-shaped frame 301, and the ends of the return springs 305a away from the inner side of the U-shaped frame 301 are respectively fixedly connected to the transverse arms of the movable frame 305.

[0048] A driving motor 301b is fixedly connected to the inner center of the U-shaped frame 301. A half gear 301c is sleeved on the output shaft of the driving motor 301b. First racks 305b are fixedly connected to the inner walls of both sides of the moving frame 305. The first racks 305b and the half gears 301c are meshed with each other.

[0049] The top end of the feeding pipe 302 is connected to the third connecting pipe 304 a via a rotary joint 302 a . The top end of the third connecting pipe 304 a passes through the bottom of the hopper 304 and extends to the lower inner side of the hopper 304 .

[0050] The rest of the structure is the same as that of Example 1.

[0051] The operating process of this embodiment is as follows: first, molten lead-bismuth metal liquid is added to the hopper 304, and the drive motor 301b is started. The output shaft of the drive motor 301b drives the half gear 301c to rotate, and under the action of the mutual engagement between the half gear 301c and the first rack 305b, the movable frame 305 and the second rack 305c perform linear reciprocating motion in the longitudinal direction. At the same time, under the action of the mutual engagement between the drive gear 302b and the second rack 305c, the feeding pipe 302 drives the diverter shell 303 to rotate back and forth inside the outer shell 1. At this time, the molten metal liquid in the hopper 304 is evenly distributed on the filter structure inside the outer shell 1 through the discharge port 303a.

[0052] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0053] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An impurity removal device for lead-bismuth alloy smelting, comprising a housing (1), characterized in that: An impurity removal component (2) is provided inside the housing (1), and a loading component (3) is also provided on the top of the housing (1); The impurity removal component (2) comprises a plurality of mounting frames (201) fixedly connected to the inner side of the housing (1) at equal intervals from top to bottom, and the inner sides of the mounting frames (201) are all fixedly connected to filter plates (202), the inner sides of the supporting arms of the mounting frames (201) are fixedly connected to preheating pipes (203), and the two ends of the preheating pipes (203) are respectively fixedly connected to a first connecting pipe (203a) and a second connecting pipe (203b), and the end of the first connecting pipe (203a) away from the preheating pipe (203) passes through a heating box (203) located on the outer wall of one side of the housing (1). 04) and is fixedly connected to an air collecting hood (203c) on the front end face thereof, and the air collecting hood (203c) is located inside the heating box (204); one end of the second connecting pipe (203b) away from the preheating pipe (203) is fixedly connected to the front end face of the air outlet box (205) located on the outer wall of the other side of the shell (1); and the front and rear ends of the inner side of the shell (1) are fixedly connected to a serpentine tube (206); both ends of the serpentine tube (206) are fixedly connected to the air outlet box (205), and a plurality of fins (206a) are evenly spaced on the serpentine tube (206); The feeding assembly (3) comprises a U-shaped frame (301) fixedly connected to one side of the top of the outer shell (1), and a feeding pipe (302) is rotatably connected to one side of the U-shaped frame (301), the bottom end of the feeding pipe (302) rotates through the top of the outer shell (1) and is fixedly connected to a diversion shell (303), and a plurality of discharge ports (303a) are arranged at equal intervals along the horizontal direction at the bottom of the diversion shell (303), the top end of the feeding pipe (302) is movably connected to a hopper (304), and a driving gear (302b) is sleeved on the outer wall of the feeding pipe (302), a movable frame (305) is movably connected to the upper part of the interior of the U-shaped frame (301), and a second rack (305c) is fixedly connected to the outer wall of one side of the movable frame (305), and the driving gear (302b) and the second rack (305c) are meshed with each other.

2. The impurity removal device for lead-bismuth alloy smelting according to claim 1, characterized in that: A plurality of L-shaped frames (101) are fixedly connected to the inner walls of both sides of the shell (1) at equal intervals in the vertical direction, and the tops of the L-shaped frames (101) respectively abut against the bottom sides of the installation frame (201), and a discharge pipe (104) passes through the bottom of the shell (1).

3. The impurity removal device for lead-bismuth alloy smelting according to claim 2, characterized in that: The front end face of the mounting frame (201) passes through the front end face of the housing (1) and extends to the outer front end of the housing (1), and rotating shafts (201a) are fixedly connected to both sides of the front end face of the mounting frame (201), rotating plates (201b) are sleeved on the rotating shafts (201a), and through slots (201c) are provided above and below the end faces of the rotating plates (201b), and a plurality of mounting rods (102) are welded to the front end face of the housing (1), and the front ends of the mounting rods (102) pass through the through slots (201c) and are threadedly sleeved with fastening nuts (103).

4. The impurity removal device for lead-bismuth alloy smelting according to claim 1, characterized in that: The rear end of the interior of the heating box (204) is fixedly connected to a plurality of filter screens (204a) at equal intervals along the longitudinal direction, and an air inlet pipe (204b) passes through the rear end surface of the heating box (204), and the rear end of the air inlet pipe (204b) is fixedly connected to an air inlet valve (204c).

5. The impurity removal device for lead-bismuth alloy smelting according to claim 1, characterized in that: An air outlet pipe (205a) passes through the bottom of the air outlet box (205), and an air outlet valve (205b) is fixedly connected to the bottom end of the air outlet pipe (205a).

6. The impurity removal device for lead-bismuth alloy smelting according to claim 1, characterized in that: Both sides of the upper inner side of the U-shaped frame (301) are fixedly connected to sliding rods (301a), and the longitudinal support arms of the movable frame (305) are slidably sleeved on the sliding rods (301a). The front and rear end surfaces of the inner side of the U-shaped frame (301) are fixedly connected to return springs (305a), and the ends of the return springs (305a) away from the inner side of the U-shaped frame (301) are respectively fixedly connected to the transverse support arms of the movable frame (305).

7. The impurity removal device for lead-bismuth alloy smelting according to claim 6, characterized in that: A driving motor (301b) is fixedly connected to the inner center of the U-shaped frame (301), and a half gear (301c) is sleeved on the output shaft of the driving motor (301b). First racks (305b) are fixedly connected to the inner walls on both sides of the moving frame (305), and the first racks (305b) and the half gears (301c) are meshed with each other.

8. The impurity removal device for lead-bismuth alloy smelting according to claim 1, characterized in that: The top end of the feeding pipe (302) is connected to a third connecting pipe (304a) via a rotary joint (302a), and the top end of the third connecting pipe (304a) passes through the bottom of the hopper (304) and extends to the lower inner side of the hopper (304).

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