CN112828243A - Pre-foaming machine for lost foam casting and working method thereof - Google Patents

Abstract

The invention relates to a prefoaming machine for lost foam casting and a working method thereof. The structure sets up rationally, has reduced holistic volume to realized material heating, foaming and exhaust integration work, and through reasonable pipe arrangement, can carry out the breakage with the material after the foaming very easily and by pipeline transport to the outside of device, reduced the labour and improved work efficiency.

Description

Pre-foaming machine for lost foam casting and working method thereof

Technical Field

The invention relates to a pre-foaming device, in particular to a pre-foaming machine for lost foam casting, which can realize integration of quick foaming and quick discharging and a working method thereof.

Background

The application field of the lost foam mold is wider and wider, and the lost foam mold is a novel casting technology with great development prospect. Lost foam molds have many advantages, such as: (1) the lost foam mold casting has the characteristics of accurate size and shape, good copying performance, precision casting and high surface smoothness. (2) The sand core and the core making part are cancelled, and casting defects and waste products caused by core making and core setting are eliminated. (3) The dry sand molding without adhesive, moisture and any additive is adopted, and various casting defects and waste products caused by moisture, additives and adhesive are eliminated. (4) The sand treatment system is greatly simplified, the molding sand can be completely reused, and a molding sand preparation work part and a waste sand main force work part are cancelled.

Prefoaming is one of the essential key steps in lost foam casting. The quality of the pre-foaming is directly related to the quality and accuracy of the outer surface of the casting. With the wide attention of people to the application of the lost foam technology, the attention to the pre-foaming process equipment is also promoted. However, the existing pre-foaming device is usually large in volume and unreasonable in structural arrangement, and especially the material is complicated in treatment process after being heated and needs more labor resources.

Disclosure of Invention

The invention mainly aims to provide a device which is reasonable in structure and arrangement, small in size and capable of quickly discharging pre-foamed materials.

In order to achieve the aim, the invention provides a pre-foaming machine for lost foam casting, which particularly comprises a shell, a feeding assembly, a heating assembly, a conveying pipeline and a crushing assembly;

the machine shell is provided with a top wall, and the top wall is provided with a feeding port; the feeding component is arranged in the shell and is positioned below the feeding port; the heating assembly is connected with the feeding assembly and comprises a heating chamber and a stirring piece, and the stirring piece is arranged in the heating chamber; the conveying pipeline is provided with a first compressed air pipe, a second compressed air pipe and an air outlet pipe, the upstream ends of the first compressed air pipe and the second compressed air pipe are connected with a compressed air pump, the downstream end of the first compressed air pipe is connected with the heating chamber, and the upstream end of the air outlet pipe is connected with the heating chamber; broken subassembly has broken room and broken piece, broken piece sets up in the broken room, broken room with the low reaches end of outlet duct links to each other, the lower extreme of broken room has the discharge gate, the discharge gate pass through the discharging pipe with the second compressed air pipe links to each other, just second compressed air pipe still links to each other with the discharging pipe.

The beneficial effect that above-mentioned scheme produced does: the structure sets up rationally, has reduced holistic volume to realized material heating, foaming and exhaust integration work, and through reasonable pipe arrangement, can carry out the breakage with the material after the foaming very easily and by pipeline transport to the outside of device, reduced the labour and improved work efficiency.

According to a preferable scheme, the conveying pipeline further comprises a back blowing assembly, the back blowing assembly comprises a communicating pipe, a first inserting port, a second inserting port and a third inserting port are formed in the communicating pipe, the first inserting port is connected with the first discharging pipe, the second inserting port is connected with the second compressed air pipe, the third inserting port is connected with the second discharging pipe, and an inserting section of the second compressed air pipe in the second inserting port extends to exceed the first inserting port.

In a preferable scheme, the feeding assembly is provided with a feeding barrel, a three-way pipe, a buffer barrel, a receiving hopper and a feeding pipe which are sequentially connected, and the downstream end of the feeding pipe is connected with the heating chamber.

The beneficial effect that above-mentioned scheme produced does: the convenience is controlled the outflow of material, especially sets up the three-way pipe and conveniently changes the outflow direction of material.

Preferably, the three-way pipe comprises a first branch pipe, a second branch pipe and a third branch pipe, the first branch pipe is connected with a barrel outlet of the feeding barrel, the second branch pipe is connected with the buffer barrel, the third branch pipe is connected with a return pipe, the tail end of the return pipe extends to the outside of the machine shell, the top wall is provided with an outlet, and the discharge pipe extends from the outlet to the outside of the machine shell;

the first valve is arranged on the second branch pipe, the second valve is arranged on the third branch pipe, the first valve is provided with a first air cylinder and a first inserting plate, the first inserting plate is arranged on the second branch pipe, the second valve is provided with a second air cylinder and a second inserting plate, and the second inserting plate is arranged on the third branch pipe.

In a preferred embodiment, a buffer valve is provided in the buffer vessel, the buffer valve having a third cylinder and a closure plate having a weighing cell.

The beneficial effect that above-mentioned scheme produced does: the automatic weighing of the material is realized, the manual process of firstly weighing and then putting the material is omitted, the automation is further improved, and the use is simpler.

Preferably, the stirring member has a stirring motor and a stirring rod connected in sequence, the stirring rod has a shaft rod and a plate body, the plate body includes a plurality of vertical plates arranged perpendicular to the shaft rod and a horizontal plate arranged parallel to the shaft rod, and a distance between the horizontal plate and an inner wall surface of the heating chamber is less than 1 cm.

The beneficial effect that above-mentioned scheme produced does: the tip of horizontal plate is very close to the internal wall face, and it is far away apart from the internal wall face to see its tip homogeneous phase of puddler of current structure according to practical experience, just so makes the in-process of stirring often cause the inhomogeneous problem of local stirring to stirring the foaming material on the internal wall face well, and because the horizontal plate of this scheme just makes the even of stirring show the promotion very near from the internal wall face to foaming effect has been ensured.

In a preferred embodiment, the heating chamber comprises a multi-layer structure, wherein the multi-layer structure comprises a stainless steel layer, a heat insulation layer, a heating film layer and an aluminum shell layer from outside to inside in sequence.

The structure sets up very rationally, can play very good heat conduction effect through the aluminium shell, and the heat preservation can play fine heat preservation effect again.

According to a preferable scheme, the prefoamer for lost foam casting further comprises a video monitoring device, the video monitoring device comprises a camera, a controller and a display screen which are sequentially connected, the camera is arranged in the heating chamber, and the display screen is arranged on the outer wall of the shell.

The invention provides a working method of a prefoamer for lost foam casting, which comprises the following steps:

s1: adding a material to be foamed into the feeding port, and moving the material into the feeding assembly;

s2: the material enters the heating assembly from the feeding assembly, and particularly enters the heating chamber;

s3: starting heating work to enable the temperature in the heating chamber to rise to a required temperature;

s4: stirring and overturning the materials in the heating chamber through a stirring piece, and simultaneously carrying out a foaming process;

s5: stopping the foaming process, starting a compression air pump to work, enabling a first compression air pipe to supply positive pressure air flow into the heating chamber, and enabling the material in the heating chamber to move in the downstream direction along the air outlet pipe under the driving of the positive pressure air flow;

s6: the material is transferred into a crushing chamber of the crushing assembly along the air outlet pipe, and the crushing member performs crushing operation on the material in the crushing chamber;

s7: the material after the breakage is along the discharging pipe enters into in the second compressed air pipe, through compressed air pump to provide the malleation in the second compressed air pipe, make the material after the second compressed air pipe drives the breakage is discharged.

In a preferred embodiment, the first and second liquid crystal display panels are,

the feeding assembly is provided with a feeding barrel, a three-way pipe, a buffer barrel, a receiving hopper and a feeding pipe which are connected in sequence, and the downstream end of the feeding pipe is connected with the heating chamber; the three-way pipe comprises a first branch pipe, a second branch pipe and a third branch pipe, the first branch pipe is connected with a barrel outlet of the feeding barrel, the second branch pipe is connected with the buffer barrel, the third branch pipe is connected with a material return pipe, the tail end of the material return pipe extends to the outside of the machine shell, the top wall is provided with an outlet, and the discharge pipe extends from the outlet to the outside of the machine shell;

the second branch pipe is provided with a first valve, the third branch pipe is provided with a second valve, the first valve is provided with a first air cylinder and a first plug board, the first plug board is arranged on the second branch pipe, the second valve is provided with a second air cylinder and a second plug board, and the second plug board is arranged on the third branch pipe; a buffer valve is arranged in the buffer barrel, the buffer valve is provided with a third air cylinder and a closing plate, and the closing plate is provided with a weighing unit;

the working method comprises the following steps:

y1: the material enters the material inlet barrel and then enters the three-way pipe;

y2: opening a first valve of the second branch pipe, namely controlling a first inserting plate through a first air cylinder to enable the second branch pipe to be in an open state, and enabling materials to enter the buffer barrel;

y3, weighing the buffer bucket through the weighing unit, and then opening a buffer valve, namely, controlling the closing plate through a third air cylinder to open a channel of the buffer bucket so that the material enters the receiving hopper;

y4: the materials enter the heating chamber from the receiving hopper;

y5: when the materials do not need to be added into the buffer barrel, the second valve is opened, namely the second inserting plate is controlled by the second air cylinder to open the third branch pipe, so that the materials in the feeding barrel are discharged from the material return pipe and are recycled.

In a preferred scheme, the heating chamber comprises a multilayer structure, wherein the multilayer structure is provided with a stainless steel layer, a heat insulation layer, a heating film layer and an aluminum shell layer from outside to inside in sequence; the pre-foaming machine for lost foam casting further comprises a video monitoring device, wherein the video monitoring device comprises a camera, a controller and a display screen which are sequentially connected, the camera is arranged in the heating chamber, and the display screen is arranged on the outer wall of the shell;

the working method comprises the following steps: the heating film layer provides heat, the heat quickly heats materials inside along the aluminum shell layer, the heat insulation layer is used for heat insulation, and the stainless steel layer provides a stable structure and is easy to fix; in addition, the internal environment of the heating chamber is imaged through a camera, and the working environment in the heating chamber is displayed through a display screen.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic view showing the structure of a prefoamer for lost foam casting according to the present invention;

FIG. 2 is a schematic structural view of a prefoamer (part of a casing is omitted) for lost foam casting according to the present invention;

FIG. 3 is a schematic structural view from another perspective of a prefoamer (with part of the casing omitted) for lost foam casting according to the present invention;

FIG. 4 is a schematic view showing the structure of a feed unit of a prefoamer for lost foam casting according to the present invention;

FIG. 5 is a schematic view showing the structure of a feed unit of a prefoamer for lost foam casting according to the present invention;

FIG. 6 is a schematic structural view of a stirring structure of a prefoamer for lost foam casting according to the present invention;

FIG. 7 is a schematic sectional view of a heating chamber of a prefoamer for lost foam casting according to the present invention;

FIG. 8 is a schematic view of a prefoamer for lost foam casting according to the present invention;

FIG. 9 is a schematic structural diagram of a blowback assembly of the prefoamer for lost foam casting according to the present invention.

Detailed Description

The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

The first embodiment:

as shown in fig. 1 to 3, the present invention provides a prefoamer for lost foam casting, which comprises a housing 1, a feeding assembly 10, a heating assembly 20, a conveying pipe 30 and a crushing assembly 40.

The housing 1 has a top wall 2, the top wall 2 having a feed port 3 and an outlet 6; the feeding assembly 10 is arranged inside the casing 1 and below the feeding port 3. The heating assembly 20 is connected with the feeding assembly 10, the heating assembly 20 comprises a heating chamber 21 and a stirring piece 22, and the stirring piece 22 is arranged in the heating chamber 21; the transfer duct 30 has a first compressed air pipe 31, a second compressed air pipe 32, and an air outlet pipe 33, and the upstream ends of the first and second compressed air pipes 31 and 32 are each connected to a compressed air pump 34, and the compressed air pumps 34 may be two independent pumps. The downstream end of the first compressed air pipe 31 is connected to the heating chamber 21, and the upstream end of the air outlet pipe 33 is connected to the heating chamber 21; the crushing assembly 40 has a crushing chamber 41 and a crushing member 42, the crushing member 42 is preferably of a stirring rod structure or a structure of an impact block to crush the material, the crushing member 42 is provided in the crushing chamber 41, the crushing chamber 41 is connected to the downstream end of the air outlet pipe 33, the lower end of the crushing chamber 41 has a discharge port 43, the discharge port 43 is connected to the second compressed air pipe 32 through a first discharge pipe 44, and the second compressed air pipe 32 is further connected to a second discharge pipe 45.

The invention provides a working method of a prefoamer for lost foam casting, which comprises the following steps:

s1: adding the material to be pre-foamed into the feeding port 3, and moving the material into the feeding component 10;

s2: the material enters the heating assembly 20, specifically the heating chamber 21, from the feeding assembly 10;

s3: starting heating operation to raise the temperature in the heating chamber 21 to a required temperature;

s4: the materials in the heating chamber 21 are stirred and turned over by the stirring piece 22, and a pre-foaming process is carried out at the same time;

s5: stopping the pre-foaming process, starting the compression air pump 34 to work, so that the first compressed air pipe 31 supplies positive pressure air flow into the heating chamber 21, and the material in the heating chamber 21 moves in the downstream direction along the air outlet pipe 33 under the driving of the positive pressure air flow;

s6: the material is transferred into the crushing chamber 41 of the crushing assembly 40 along the air outlet pipe 33, and the crushing member 42 performs crushing operation on the material in the crushing chamber 41; the purpose of the crushing operation is to reduce the size of the material to be crushed, which is a part of the material that forms a sticky or caked mass, which is advantageous for the subsequent foaming process.

S7: the crushed material enters the second compressed air pipe 32 along the first discharge pipe 44, and positive pressure is provided to the second compressed air pipe 32 by the other compressed air pump 34, so that the second compressed air pipe 32 drives the crushed material to be discharged from the outlet 6 of the top wall 2 along the second discharge pipe 45. Another process after pre-foaming is a foaming process, which is usually completed by a corresponding foaming mold.

Second embodiment:

as shown in fig. 8 and 9, the conveying pipe further includes a blowback assembly 50, the blowback assembly 50 includes a communicating pipe 54, the communicating pipe 54 has a first connection port 51, a second connection port 52 and a third connection port 53, the first connection port 51 is connected to the first discharging pipe 44, the second connection port 52 is connected to the second compressed air pipe 32, the third connection port 53 is connected to the second discharging pipe 45, and the insertion section 55 of the second compressed air pipe 32 in the second connection port 52 extends beyond the first connection port 51.

The working method of the prefoamer for lost foam casting of the embodiment is as follows:

in S7: the crushed material enters the communicating pipe 54 from the position of the first socket 51 along the first discharge pipe 44, and at the same time, the second compressed air pipe 32 supplies air flow into the communicating pipe 54, thereby causing the material in the communicating pipe 54 to enter the second discharge pipe 45 along the third socket 53 and finally rise to the position of the top outlet 6. Moreover, since the insertion section of the second compressed air pipe 32 in the second insertion port 52 extends beyond the first insertion port 51, no blowback phenomenon occurs when the air is supplied into the communication pipe 54 through the second compressed air pipe 32, i.e., the material is not blown back in the direction of the first discharging pipe 44.

The third embodiment:

as shown in fig. 4 and 5, the feeding assembly 10 has a feeding barrel 9, a three-way pipe 11, a buffer barrel 12, a receiving hopper 13 and a feeding pipe 14 which are connected in sequence, and the downstream end of the feeding pipe 14 is connected with a heating chamber 21; the three-way pipe 11 comprises a first branch pipe 15, a second branch pipe 16 and a third branch pipe 17, the first branch pipe 15 is connected with a barrel outlet 8 of the feeding barrel 9, the second branch pipe 16 is connected with the buffering barrel 12, the third branch pipe 17 is connected with a material return pipe 18, and the tail end of the material return pipe 18 extends to the outside of the machine shell 1. The top wall 2 has an outlet 6, and a second outlet pipe 45 extends from the outlet 6 to the outside of the casing 1;

a first valve is arranged on the second branch pipe 16, a second valve is arranged on the third branch pipe 17, the first valve is provided with a first air cylinder 161 and a first plug plate, the first plug plate is arranged on the second branch pipe 16, the second valve is provided with a second air cylinder 171 and a second plug plate, and the second plug plate is arranged on the third branch pipe 17; a buffer valve is arranged in the buffer barrel 12, the buffer valve is provided with a third cylinder and a closing plate, and the closing plate 122 is provided with a weighing unit;

the working method comprises the following steps:

y1: the material enters the feeding barrel 9 and then enters the three-way pipe 11;

y2: opening a first valve of the second branch pipe 16, namely, controlling the first inserting plate through the first air cylinder 161 to enable the second branch pipe 16 to be in an open state, so that the materials enter the buffer barrel 12;

y3, weighing the materials in the buffer barrel 12 through the weighing unit, and then opening the buffer valve, namely, opening the channel of the buffer barrel 12 through the third cylinder control closing plate to enable the materials to enter the receiving hopper 13;

y4: the materials enter the heating chamber 21 from the receiving hopper 13;

y5: when the material is not required to be added into the buffer barrel 12, the second valve is opened, that is, the second cylinder 171 controls the second inserting plate to open the third branch pipe 17, so that the material in the material inlet barrel 9 is discharged from the material return pipe 18 and recycled.

The fourth embodiment:

as shown in fig. 6 and 7, as a preferred embodiment, the stirrer 22 of the present embodiment has a stirrer motor 221 and a stirrer bar connected in sequence, the stirrer bar has a shaft 222 and a plate body, the plate body includes a plurality of vertical plates 223 provided perpendicular to the shaft 222 and horizontal plates 224 arranged in parallel with the shaft 222, and the horizontal plates 224 are spaced from the inner wall surface of the heating chamber 21 by a distance of 1 cm or less.

The heating chamber 21 comprises a multilayer structure 25, wherein the multilayer structure 25 is provided with a stainless steel layer 26, a heat preservation layer 27, a heating film layer 28 and an aluminum shell layer 29 from outside to inside in sequence; the prefoaming machine for lost foam casting also comprises a video monitoring device, wherein the video monitoring device comprises a camera, a controller and a display screen 24 which are sequentially connected, the camera is arranged in the heating chamber 21, and the display screen 24 is arranged on the outer wall 4 of the machine shell 1. The heating film 28 is preferably a resistance wire structure that is electrically heated by means of an electrical power supply. The heat insulation layer 27 is made of a heat insulation structure in the prior art, such as an asbestos heat insulation layer.

The working method comprises the following steps: heat is supplied by the heating film layer 28, the heat rapidly heats the materials in the aluminum shell layer 29, the heat is insulated by the insulating layer 27, and the stainless steel layer 26 provides a stable structure and is easy to fix; further, the internal environment of the heating chamber 21 is imaged by the camera, and the working environment in the heating chamber 21 is displayed by the display screen 24.

It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (10)

1. A prefoamer for lost foam casting, comprising:

a housing having a top wall with a feed port;

the feeding component is arranged in the shell and is positioned below the feeding port;

the heating assembly is connected with the feeding assembly and comprises a heating chamber and a stirring piece, and the stirring piece is arranged in the heating chamber;

the conveying pipeline is provided with a first compressed air pipe, a second compressed air pipe and an air outlet pipe, the upstream ends of the first compressed air pipe and the second compressed air pipe are connected with a compressed air pump, the downstream end of the first compressed air pipe is connected with the heating chamber, and the upstream end of the air outlet pipe is connected with the heating chamber;

the crushing assembly, the crushing assembly has broken room and broken piece, broken piece sets up in the broken room, broken room with the low reaches end of outlet duct links to each other, the lower extreme of broken room has the discharge gate, the discharge gate through first discharging pipe with the second compressed air pipe links to each other, just second compressed air pipe still links to each other with the second discharging pipe.

2. The prefoamer for lost foam casting according to claim 1, wherein,

the conveying pipeline further comprises a back-blowing assembly, the back-blowing assembly comprises a communicating pipe, a first inserting port, a second inserting port and a third inserting port are formed in the communicating pipe, the first inserting port is connected with the first discharging pipe, the second inserting port is connected with the second compressed air pipe, the third inserting port is connected with the second discharging pipe, and the second compressed air pipe is located in an inserting section in the second inserting port and extends beyond the first inserting port.

3. The prefoamer for lost foam casting according to claim 1, wherein said feeding assembly has a feeding barrel, a three-way pipe, a buffer barrel, a receiving hopper and a feeding pipe connected in sequence, and the downstream end of said feeding pipe is connected to said heating chamber.

4. The prefoamer for evaporative pattern casting as claimed in claim 3, wherein said tee pipe comprises a first branch pipe, a second branch pipe and a third branch pipe, said first branch pipe is connected to a barrel outlet of said charging barrel, said second branch pipe is connected to said buffer barrel, said third branch pipe is connected to a return pipe, a distal end of said return pipe extends to the outside of said cabinet, said top wall has an outlet, said discharging pipe extends from said outlet to the outside of said cabinet;

the first valve is arranged on the second branch pipe, the second valve is arranged on the third branch pipe, the first valve is provided with a first air cylinder and a first inserting plate, the first inserting plate is arranged on the second branch pipe, the second valve is provided with a second air cylinder and a second inserting plate, and the second inserting plate is arranged on the third branch pipe.

5. The prefoamer for lost foam casting according to claim 4, wherein,

a buffer valve is arranged in the buffer barrel, the buffer valve is provided with a third air cylinder and a closing plate, and the closing plate is provided with a weighing unit;

the stirring piece is provided with a stirring motor and a stirring rod which are sequentially connected, the stirring rod is provided with a shaft lever and a plate body, the plate body comprises a plurality of vertical plates which are perpendicular to the shaft lever and horizontal plates which are parallel to the shaft lever, and the spacing distance between the horizontal plates and the inner wall surface of the heating chamber is less than 1 cm.

6. The prefoamer for lost foam casting according to claim 1, wherein,

the heating chamber comprises a multilayer structure, wherein the multilayer structure is sequentially provided with a stainless steel layer, a heat insulation layer, a heating film layer and an aluminum shell layer from outside to inside.

7. The prefoamer for lost foam casting according to claim 1, wherein,

the prefoaming machine that lost foam casting was used still includes video monitoring device, video monitoring device is including the camera, controller and the display screen that connect gradually, the camera sets up in the heating chamber, the display screen sets up on the outer wall of casing.

8. The method of operating a prefoamer for lost foam casting according to claim 1, characterized by comprising the following steps:

s1: adding a material to be foamed into the feeding port, and moving the material into the feeding assembly;

s2: the material enters the heating assembly from the feeding assembly, and particularly enters the heating chamber;

s3: starting heating work to enable the temperature in the heating chamber to rise to a required temperature;

s4: stirring and overturning the materials in the heating chamber through a stirring piece, and simultaneously carrying out a foaming process;

s5: stopping the foaming process, starting a compression air pump to work, enabling a first compression air pipe to supply positive pressure air flow into the heating chamber, and enabling the material in the heating chamber to move in the downstream direction along the air outlet pipe under the driving of the positive pressure air flow;

s6: the material is transferred into a crushing chamber of the crushing assembly along the air outlet pipe, and the crushing member performs crushing operation on the material in the crushing chamber;

s7: the material after the breakage is along the discharging pipe enters into in the second compressed air pipe, through compressed air pump to provide the malleation in the second compressed air pipe, make the material after the second compressed air pipe drives the breakage is discharged.

9. The method of operating a prefoamer for lost foam casting according to claim 8, wherein,

the feeding assembly is provided with a feeding barrel, a three-way pipe, a buffer barrel, a receiving hopper and a feeding pipe which are connected in sequence, and the downstream end of the feeding pipe is connected with the heating chamber; the three-way pipe comprises a first branch pipe, a second branch pipe and a third branch pipe, the first branch pipe is connected with a barrel outlet of the feeding barrel, the second branch pipe is connected with the buffer barrel, the third branch pipe is connected with a material return pipe, the tail end of the material return pipe extends to the outside of the machine shell, the top wall is provided with an outlet, and the discharge pipe extends from the outlet to the outside of the machine shell;

the second branch pipe is provided with a first valve, the third branch pipe is provided with a second valve, the first valve is provided with a first air cylinder and a first plug board, the first plug board is arranged on the second branch pipe, the second valve is provided with a second air cylinder and a second plug board, and the second plug board is arranged on the third branch pipe; a buffer valve is arranged in the buffer barrel, the buffer valve is provided with a third air cylinder and a closing plate, and the closing plate is provided with a weighing unit;

the working method comprises the following steps:

y1: the material enters the material inlet barrel and then enters the three-way pipe;

y2: opening a first valve of the second branch pipe, namely controlling a first inserting plate through a first air cylinder to enable the second branch pipe to be in an open state, and enabling materials to enter the buffer barrel;

y3, weighing the buffer bucket through the weighing unit, and then opening a buffer valve, namely, controlling the closing plate through a third air cylinder to open a channel of the buffer bucket so that the material enters the receiving hopper;

y4: the materials enter the heating chamber from the receiving hopper;

y5: when the materials do not need to be added into the buffer barrel, the second valve is opened, namely the second inserting plate is controlled by the second air cylinder to open the third branch pipe, so that the materials in the feeding barrel are discharged from the material return pipe and are recycled.

10. The method of operating a prefoamer for lost foam casting according to claim 8 or 9, wherein,

the stirring piece is provided with a stirring motor and a stirring rod which are sequentially connected, the stirring rod is provided with a shaft lever and a plate body, the plate body comprises a plurality of vertical plates which are vertically arranged with the shaft lever and horizontal plates which are arranged in parallel with the shaft lever, and the spacing distance between the horizontal plates and the inner wall surface of the heating chamber is less than 1 cm;

the heating chamber comprises a multilayer structure, wherein the multilayer structure is sequentially provided with a stainless steel layer, a heat insulation layer, a heating film layer and an aluminum shell layer from outside to inside; the pre-foaming machine for lost foam casting further comprises a video monitoring device, wherein the video monitoring device comprises a camera, a controller and a display screen which are sequentially connected, the camera is arranged in the heating chamber, and the display screen is arranged on the outer wall of the shell;

the working method comprises the following steps: the heating film layer provides heat, the heat quickly heats materials inside along the aluminum shell layer, the heat insulation layer is used for heat insulation, and the stainless steel layer provides a stable structure and is easy to fix; in addition, the internal environment of the heating chamber is imaged through a camera, and the working environment in the heating chamber is displayed through a display screen.

Images