A safety group welding smoking device for a lost foam casting group tree

Abstract

This invention relates to the field of fume extraction hood technology, and more particularly to a safe fume extraction device for investment casting and assembly welding. It includes: a hood body, with a flange structure on the upper side of the hood body for connection to a pipeline; a mounting frame fixedly connected to the upper part of the hood body; a mounting cylinder provided on the mounting frame; a drive shaft provided on the mounting cylinder; and several condensation meshes fixedly connected to the lower end of the drive shaft. The condensation meshes are used to condense wax in the flue gas onto their surfaces as the flue gas passes through. A ring mesh is fixedly connected to the periphery of all the condensation meshes. This invention guides waxy flue gas through the condensation meshes, causing the wax to condense on the surface of the meshes. This reduces the probability of wax entering the gas pipeline with the flue gas. On the one hand, it reduces the impact of wax adhesion on the pipeline's flow area, ensuring extraction efficiency; on the other hand, it reduces the impact of wax adhesion on the pipeline's deformation freedom, ensuring convenient adjustment of the fume extraction hood position.

Description

Technical Field

[0001] This invention relates to the field of fume extraction hood technology, and in particular to a fume extraction device for safe welding of investment casting tree assembly. Background Technology

[0002] Investment casting is a process for manufacturing precision metal castings using fusible wax models. The assembly process, where multiple wax models are welded onto a gating system to form a module, is a crucial step that directly determines the efficiency and quality of subsequent shell making and casting. During the assembly process, tools are used to partially melt the wax model to be welded. This melting process generates wax-containing fumes. Current technology typically uses a fume hood above the assembly station to extract these fumes using negative pressure, reducing harm to workers. Because the fumes from the assembly process contain wax, the wax reacts with... When the wax enters the low-temperature gas collection hood and gas delivery pipeline, it condenses and adheres to the surface of the hood and pipeline. The position and height of the gas collection hood need to be adjusted from time to time according to the arrangement of the tree assembly process and work requirements. This means that the gas delivery pipeline connected to the gas collection hood needs to deform with the change of the position of the gas collection hood. However, due to the condensation of wax on the inner wall of the pipeline, the bending deformation of the pipeline is affected, which in turn affects the freedom of adjustment of the position of the gas collection hood. Furthermore, as the wax gradually accumulates, the effective flow area inside the gas delivery pipeline decreases, air resistance increases, and the ventilation efficiency decreases. Summary of the Invention

[0003] This invention provides a safe fume extraction device for the assembly welding of trees in investment casting, which overcomes the disadvantages of wax in the fume of the tree assembly process condensing into the inside of the gas collection hood and gas delivery pipe when it cools, resulting in reduced extraction efficiency and affecting the adjustment of the position of the gas collection hood.

[0004] The technical solution of the present invention is as follows: a fume extraction device for safe welding of investment casting tree assembly, comprising: a hood, wherein a flange structure for connecting to a pipe is provided on the upper side of the hood, a mounting frame is fixedly connected to the upper part of the hood, the mounting frame is provided with a mounting cylinder, the mounting cylinder is provided with a drive shaft, and a plurality of condensation meshes are fixedly connected to the lower end of the drive shaft. The condensation meshes are used to cause wax in the flue gas to condense on their surface when the flue gas passes through, and a ring mesh is fixedly connected to the periphery of all the condensation meshes. A heating collection component for cleaning and collecting the wax adhering to the condensation meshes and the ring meshes is provided in the hood body near the ring meshes.

[0005] Furthermore, the horizontal height of the center of the condensation mesh is greater than the horizontal height of its edges.

[0006] Furthermore, the heating and collecting assembly includes: a collecting shell disposed on the periphery of the ring mesh, the collecting shell being used to collect the condensate mesh and the wax condensed on the surface of the ring mesh; a mounting frame fixedly connected to the housing near the ring mesh, the mounting frame being mounted with a heating wire; the projection of the collecting shell on the horizontal plane being located within the projection of the mounting frame on the horizontal plane, and the collecting shell being coaxial with the mounting frame; a heat-conducting ring fixedly connected to the upper side of the condensate mesh, which contacts the collecting shell; the collecting shell and the heat-conducting ring together being used to transfer the heat generated by the heating wire to the ring mesh and all of the condensate mesh.

[0007] Furthermore, an elastic ring is fixedly connected to the upper part of the inner side of the collection shell. The elastic ring abuts against the upper condensation mesh. All the condensation meshes and the outer periphery of the ring mesh together form a cylindrical surface. An elastic sheet is fixedly connected to the outer periphery of the ring mesh. The elastic sheet is used to limit the elastic ring.

[0008] Furthermore, there are two condensation meshes. In the direction from the inside to the outside of the ring mesh, the aperture of the mesh on the lower condensation mesh gradually decreases, while the aperture of the mesh on the upper condensation mesh gradually increases, and there is a gap between the two condensation meshes.

[0009] Furthermore, the lowest point inside the collection shell is located below the two condensation nets, and there is a vertical gap between the lower condensation net and the collection shell.

[0010] Furthermore, the mounting bracket is rotatably connected to the mounting cylinder, and the mounting cylinder is fixedly connected to a centrifugal impeller via a connecting rod. The centrifugal impeller is coaxial with the ring network and located above the ring network. The centrifugal impeller corresponds to the heating wire in the vertical direction. The centrifugal impeller is used to guide the flue gas through the heating wire. A guide shell is fixedly connected to the lower side of the hood, and a guide cover is fixedly connected to the guide shell. The collecting shell is in contact with the guide cover. An annularly distributed exhaust duct is provided on the guide shell near the guide cover. The exhaust duct is used to discharge the flue gas between the hood and the guide cover to the inside of the guide cover.

[0011] Furthermore, the mounting sleeve is splinedly connected to the drive shaft.

[0012] Furthermore, the inner circumference of the condensation mesh, the inner side of the guide cover, and the lower side of the collection shell are all trumpet-shaped annular curved surfaces. The angle between the generatrix of the annular curved surface on the inner circumference of the condensation mesh and the horizontal plane is smaller than the angle between the generatrix of the annular curved surface on the inner side of the guide cover and the horizontal plane. The angle between the generatrix of the annular curved surface on the inner side of the guide cover and the horizontal plane is equal to the angle between the generatrix of the annular curved surface on the lower side of the collection shell and the horizontal plane.

[0013] Furthermore, a fan is fixedly connected to the upper part of the drive shaft, and the fan is located inside the housing.

[0014] Those skilled in the art will understand that the present invention has at least the following beneficial effects: by guiding waxy flue gas through a condenser mesh, the wax condenses on the surface of the condenser mesh, thereby reducing the probability of wax entering the gas transmission pipeline with the flue gas. On the one hand, this reduces the impact of wax adhesion on the pipeline flow area, ensuring ventilation efficiency; on the other hand, it reduces the impact of wax adhesion on the pipeline deformation freedom, ensuring the convenience of adjusting the position of the gas collecting hood.

[0015] Heating the condenser mesh and ring mesh with heating wires melts the wax adhering to their surfaces. The molten wax then flows and collects into the collection shell, thus cleaning and collecting the wax adhering to the condenser mesh and ring mesh. This not only ensures the flow area of ​​the condenser mesh and ring mesh but also facilitates the recovery and reuse of wax in the flue gas, improving resource utilization.

[0016] By rotating the centrifugal impeller, some of the wax-free flue gas is heated and guided to flow along the inside of the guide hood, forming an air film inside the guide hood. This reduces the probability of wax adhering to the inside of the guide hood in the waxy exhaust gas. In this way, the wax in the flue gas is collected on the condensation net, reducing the difficulty of cleaning the guide hood and improving the convenience of wax collection. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural cross-sectional view of the cover and guide cover of the present invention; Figure 3 This is a three-dimensional structural diagram of the housing and mounting frame of the present invention; Figure 4 This is a three-dimensional structural diagram of the condensation mesh and collection shell of the present invention; Figure 5 This is a three-dimensional structural diagram of the drive shaft and condenser screen of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the condenser mesh and ring mesh of the present invention; Figure 7 Appendix to this invention Figure 6 Enlarged view of point A in the middle.

[0018] In the diagram: 1-Cover, 2-Mounting bracket, 3-Mounting cylinder, 4-Drive shaft, 5-Condensing mesh, 6-Ring mesh, 7-Collection shell, 8-Mounting frame, 9-Heating wire, 10-Heat-conducting ring, 11-Elastic ring, 12-Elastic sheet, 15-Centrifugal impeller, 16-Guide shell, 161-Exhaust duct, 17-Guide cover, 18-Fan. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] Example 1 This embodiment discloses a safe welding fume extraction device for investment casting tree assembly, which solves the problem that wax in the fume of the tree assembly process condenses on the inside of the gas collection hood and gas delivery pipe when it cools, resulting in reduced ventilation efficiency and affecting the adjustment of the position of the gas collection hood.

[0021] See Figures 1 to 5 A safe fume extraction device for investment casting assembly includes: a hood 1, which consists of a cylindrical connecting section and an expansion section with a gradually changing inner diameter. The upper side of the connecting section of the hood 1 is provided with a flange structure for connecting to a gas pipeline. An installation frame 2 is fixedly connected to the upper part of the hood 1. The installation frame 2 is provided with an installation cylinder 3. The installation cylinder 3 is provided with a drive shaft 4. Several condensation meshes 5 are fixedly connected to the lower end of the drive shaft 4. The condensation meshes 5 are used to condense wax in the flue gas on their surface when the flue gas passes through. A ring mesh 6 is fixedly connected to the periphery of all the condensation meshes 5. A heating collection component is provided in the expansion section of the hood 1 near the ring mesh 6 for cleaning and collecting the wax adhering to the condensation meshes 5 and the ring mesh 6.

[0022] It should be noted that in this embodiment, the mounting bracket 2 and the mounting cylinder 3 can be considered as a fixed connection, and the mounting cylinder 3 and the drive shaft 4 can be considered as a fixed connection; the condenser mesh 5 is located in the expansion section of the cover 1 near the connecting section.

[0023] The above setup enables the following: by guiding the waxy flue gas through the condenser mesh 5, the wax condenses on the surface of the condenser mesh 5, thus reducing the probability of the wax entering the gas transmission pipeline with the flue gas. On the one hand, it reduces the impact of wax adhesion on the pipeline flow area, ensuring ventilation efficiency; on the other hand, it reduces the impact of wax adhesion on the pipeline deformation freedom, ensuring the convenience of adjusting the position of the gas collection hood.

[0024] See Figures 2 to 7The horizontal height of the middle part of the condensation mesh 5 is greater than the horizontal height of its edge, making the condensation mesh 5 a frustum-shaped shell, which facilitates the flow of wax adhering to the condensation mesh 5 to its outer periphery; the heating collection assembly includes: a collection shell 7, which is set on the periphery of the ring mesh 6. The collection shell 7 is made of metal, and brass can be selected here; the collection shell 7 is used to collect the wax that has condensed on the surface of the condensation mesh 5 and the ring mesh 6. An installation frame 8 is fixed to the upper part inside the cover 1. The installation frame 8 is a cylindrical shape with uniformly distributed through holes in the circumference; installation The frame 8 is equipped with a heating wire 9, which is spirally fitted into the frame 8. The projection of the collection shell 7 on the horizontal plane is located within the projection of the frame 8 on the horizontal plane, and the collection shell 7 and the frame 8 are coaxial. The upper condensation mesh 5 is fixed with a heat-conducting ring 10 that contacts the collection shell 7. The condensation mesh 5, the ring mesh 6, and the heat-conducting ring 10 are all made of metal, and brass can be used here. The collection shell 7 and the heat-conducting ring 10 are used together to transfer the heat generated by the heating wire 9 to the ring mesh 6 and all the condensation meshes 5.

[0025] It should be noted that in this embodiment, the heating wire 9 is not energized and heats up before the wax cleaning process is started, and the heating wire 9 and the collection shell 7 are vertically aligned.

[0026] The above setup enables the heating wire 9 to heat the condenser mesh 5 and the ring mesh 6, melting the wax adhering to their surfaces. The molten wax then flows and collects into the collection shell 7 due to its fluidity, thus cleaning and collecting the wax adhering to the condenser mesh 5 and the ring mesh 6. This not only ensures the flow area of ​​the condenser mesh 5 and the ring mesh 6 but also facilitates the recovery and reuse of wax in the flue gas, improving resource utilization.

[0027] See Figures 5 to 7 The collecting shell 7 has two symmetrically distributed pull rings on its lower side. An elastic ring 11 is fixed to the upper part of the inner side of the collecting shell 7. The elastic ring 11 abuts against the upper condensation mesh 5. All the condensation meshes 5 and the outer periphery of the ring mesh 6 together form a cylindrical surface, and the diameter of the cylindrical surface is the same at all points in the vertical direction. An elastic sheet 12 is fixed to the outer periphery of the ring mesh 6. Both the elastic ring 11 and the elastic sheet 12 are made of high-temperature resistant elastic rubber. The elastic sheet 12 is used to limit the elastic ring 11. Initially, the relative position of the collecting shell 7 and the ring mesh 6 is kept stable by the support and limitation of the elastic ring 11 by the elastic sheet 12. When it is necessary to disassemble and clean the collecting shell 7, simply pull the pull ring of the collecting shell 7 to move the collecting shell 7 downward relative to the ring mesh 6. The collecting shell 7 drives the elastic ring 11 downward and wraps around the outer periphery of the elastic sheet 12. The elastic ring 11 and the elastic sheet 12 squeeze each other and deform. In this way, the elastic force and friction of the elastic sheet 12 and the elastic ring 11 are overcome, and the collecting shell 7 can be disassembled.

[0028] The above configuration enables the elastic ring 11 to be limited by the elastic sheet 12, which not only keeps the relative position of the collection shell 7 and the ring net 6 stable, but also facilitates the disassembly and cleaning of the collection shell 7 when the wax inside the collection shell 7 needs to be cleaned. At the same time, when the collection shell 7 is disassembled, the elastic ring 11 can move along the cylindrical surface formed by the condensation net 5 and the ring net 6 to actively scrape off the wax adhering to the cylindrical surface. This reduces the probability of wax dripping from the condensation net 5 and the ring net 6 during the disassembly and cleaning of the collection shell 7.

[0029] During the tree assembly process, the waxy flue gas generated is drawn into the hood 1 by negative pressure. After passing through the condenser net 5, the flue gas flows into the gas pipeline for further treatment and discharge. During the process of passing through the condenser net 5, the wax in the flue gas condenses on the surface of the condenser net 5 when it cools down, so that the wax adheres to the surface of the condenser net 5.

[0030] When it is necessary to clean the wax adhering to the condenser mesh 5, the heating wire 9 is activated to generate heat. The heating wire 9 transfers heat to the condenser mesh 5 and the ring mesh 6 through the collecting shell 7 and the heat-conducting ring 10, melting the wax adhering to the surfaces of the condenser mesh 5 and the ring mesh 6. Due to the shape of the condenser mesh 5, the wax on the condenser mesh 5 is guided to move towards the ring mesh 6. The wax gradually moves and accumulates on the surface of the ring mesh 6. Finally, the wax adhering to the ring mesh 6 drips into the collecting shell 7, thus collecting the wax and cleaning the wax adhering to the condenser mesh 5 and the ring mesh 6. After waiting for a period of time (the time here is determined by the time required for the melted wax to flow from the condenser mesh 5 into the collecting shell 7), the heating wire 9 is stopped.

[0031] Example 2 This embodiment is a further optimization based on Embodiment 1.

[0032] See Figures 4 to 6 There are two condenser nets 5. In the direction from the inside to the outside of the ring net 6, the aperture of the net hole of the lower condenser net 5 gradually decreases, so that most of the flue gas flows from the middle of the lower condenser net 5 to the space between the two condenser nets 5. The aperture of the net hole of the upper condenser net 5 gradually increases, so that most of the flue gas between the two condenser nets 5 flows to the gas transmission pipe through the outer periphery of the upper condenser net 5. There is a gap between the two condenser nets 5. By limiting the flow resistance on the inside and outside of the two condenser nets 5, the flue gas is guided to flow between the two condenser nets 5 towards the ring net 6.

[0033] The above setup enables the flue gas to flow towards its outer periphery between the two condenser screens 5 through the distribution of the mesh holes in the condenser screen 5. In this way, the wax adhering to the condenser screen 5 is carried into the collection shell 7 during the flue gas flow, thereby improving the collection and cleaning efficiency of the wax on the condenser screen 5.

[0034] See Figure 7The lowest point inside the collecting shell 7 is located below the two condensation nets 5, and there is a gap between the lower condensation net 5 and the collecting shell 7 in the vertical direction; so that the wax can flow directly into the collecting shell 7 along the lower side of the lower condensation net 5.

[0035] Example 3 This embodiment is a further optimization based on embodiment 2.

[0036] See Figures 2 to 4 The mounting bracket 2 is rotatably connected to the mounting cylinder 3. The mounting cylinder 3 is fixedly connected to a centrifugal impeller 15 via a connecting rod. During rotation, the centrifugal impeller 15 guides the flue gas inside to its outer periphery through centrifugal force and the guidance of the fan blades. The centrifugal impeller 15 is coaxial with the ring mesh 6 and located above the ring mesh 6. The centrifugal impeller 15 corresponds to the heating wire 9 in the vertical direction. The centrifugal impeller 15 is used to guide the flue gas through the heating wire 9. A guide shell 16 is fixedly connected to the lower side of the cover 1. The guide hood 17 is connected, and the collection shell 7 is in contact with the guide hood 17. The guide shell 16 is provided with two sets of exhaust channels 161 near the guide hood 17. Each set of exhaust channels 161 consists of several equidistantly distributed rings. The two sets of exhaust channels 161 are staggered so that the hot flue gas discharged from the exhaust channels 161 can completely cover the inner side of the guide hood 17. The exhaust channels 161 are used to discharge the flue gas between the hood 1 and the guide hood 17 to the inside of the guide hood 17.

[0037] The above setup enables the centrifugal impeller 15 to rotate, heating a portion of the non-waxy flue gas and guiding it to flow along the inner side of the guide shroud 17, forming a wind film on the inner side of the guide shroud 17. This reduces the probability of wax in the waxy exhaust gas adhering to the inner side of the guide shroud 17, thus collecting the wax in the flue gas onto the condenser screen 5, reducing the difficulty of cleaning the guide shroud 17, and improving the convenience of wax collection.

[0038] It should be noted that in this embodiment, both the ring network 6 and the centrifugal impeller 15 are located in the expansion section of the cover 1; the heating wire 9 is continuously energized during the air extraction process, and the power of the centrifugal impeller 15 can be provided by an external motor or other means.

[0039] See Figure 3 , Figure 5 and Figure 6 The mounting cylinder 3 is splinedly connected to the drive shaft 4. Initially, the collecting shell 7 and the heating wire 9 are not aligned in the vertical direction, so the heat on the heating wire 9 cannot be directly transferred to the collecting shell 7.

[0040] The above settings can achieve the following: by setting the drive shaft 4 to be able to slide up and down, the influence of the heat on the heating wire 9 on the temperature of the condensing screen 5 is reduced when the wax on the condensing screen 5 is not cleaned. This not only ensures the effect of wax condensing and adhering on the condensing screen 5, but also prevents the wax from being continuously heated and charring, thus maintaining the quality of the collected wax.

[0041] See Figures 2 to 4 The inner circumference of the condensation net 5, the inner side of the guide cover 17, and the lower side of the collection shell 7 are all trumpet-shaped annular curved surfaces. The diameters of the three annular curved surfaces gradually increase from top to bottom. The angle between the generatrix of the annular curved surface on the inner circumference of the condensation net 5 and the horizontal plane is smaller than the angle between the generatrix of the annular curved surface on the inner side of the guide cover 17 and the horizontal plane. The angle between the generatrix of the annular curved surface on the inner side of the guide cover 17 and the horizontal plane is equal to the angle between the generatrix of the annular curved surface on the lower side of the collection shell 7 and the horizontal plane. Initially, the annular curved surface on the inner side of the guide cover 17 is connected to the annular curved surface on the lower side of the collection shell 7.

[0042] The above setup enables the flow of wax-free hot flue gas inside the guide hood 17 to carry some wax-containing flue gas along with it. With the help of the arrangement of the condenser net 5, the collection shell 7 and the guide hood 17, the flue gas flowing along the inside of the guide hood 17 collides with the condenser net 5, increasing the probability of wax in the flue gas contacting the condenser net 5, thereby improving the collection efficiency of wax in the flue gas by the condenser net 5.

[0043] During the extraction process, the heating wire 9 is activated, and the centrifugal impeller 15 is driven to rotate by an external power source. After the flue gas passes through the condenser mesh 5, part of the flue gas continues to flow upward along the connecting section of the hood 1, while the other part of the flue gas passes through the heating wire 9 under the guidance of the centrifugal impeller 15, causing the flue gas to heat up. Subsequently, the hot flue gas flows downward along the expansion section of the hood 1. This part of the flue gas enters between the hood 1 and the guide hood 17 and is discharged through the exhaust channel 161. Under the guidance of the exhaust channel 161, the hot flue gas adheres to the inner side of the guide hood 17 and flows upward, generating an air film on the inner side of the guide hood 17. This reduces the probability of waxy flue gas contacting the guide hood 17 and maintains the fluidity of the wax in the waxy flue gas. This allows the wax in the flue gas to continue flowing along the condenser mesh 5 after colliding with the condenser mesh 5, reducing the speed at which the wax adheres to the condenser mesh 5 and thus reducing the rate at which the mesh holes of the condenser mesh 5 become clogged.

[0044] As the hot flue gas guides the flow of waxy flue gas, the flue gas gradually flows to the connection between the collection shell 7 and the condenser net 5. Due to the different inclination angles of the generatrices of the cylinders, the connection between the condenser net 5 and the collection shell 7 forms an angle, which increases the probability of the flue gas colliding with the condenser net 5, and thus increases the probability of the wax in the flue gas colliding and contacting with the condenser net 5.

[0045] As the wax gradually adheres to the condenser mesh 5, the flow area of ​​the condenser mesh 5 gradually decreases, causing the pressure difference between the upper and lower sides of the condenser mesh 5 to gradually increase. This pressure difference provides an upward thrust to the condenser mesh 5. When the thrust from the pressure difference to the condenser mesh 5 exceeds its weight, the condenser mesh 5 moves upward. The condenser mesh 5 drives the drive shaft 4, the ring mesh 6, and the collecting shell 7 to move upward together, so that the collecting shell 7 corresponds to the heating wire 9 in the vertical direction. On the one hand, the collecting shell 7 is brought closer to the heating wire 9 to rapidly heat the condenser mesh 5 and the ring mesh 6. On the other hand, as the condenser mesh 5 moves upward, the collecting shell 7 loses contact with the guide cover 17. At this time, the hot flue gas located between the cover 1 and the guide cover 17 is directly discharged through the gap between the collecting shell 7 and the guide cover 17. This increases the temperature when the hot flue gas comes into contact with the condenser mesh 5, and uses the heat in the hot flue gas to assist the condenser mesh 5 in heating up, which facilitates the flow of the wax adhering to the condenser mesh 5.

[0046] After the wax is removed, the pressure difference between the upper and lower sides of the condenser 5 decreases as the flow area of ​​the condenser 5 is restored. Under its own weight, the condenser 5 drives the ring net 6 and the collection shell 7 to move down and reset together. After the tree assembly process is stopped, the heating wire 9 and the external power are stopped.

[0047] Example 4 This embodiment is a further optimization based on embodiment 3.

[0048] See Figures 1 to 5 A fan 18 is fixedly connected to the upper part of the drive shaft 4, and the fan 18 is located inside the cover 1.

[0049] The above setup enables the fan 18 to rotate by the flow of flue gas within the hood 1. In this way, the fan 18 and the flow of flue gas provide power to the centrifugal impeller 15. This not only utilizes the energy of the flue gas flow and improves energy efficiency, but also couples the rotational speed of the fan 18 with the flow area of ​​the condenser mesh 5. As the flow area of ​​the condenser mesh 5 decreases, the rotational speed of the centrifugal impeller 15 decreases synchronously, thereby reducing the proportion of hot flue gas passing through the condenser mesh 5 and maintaining a stable volume of waxy flue gas extracted, thus maintaining stable extraction efficiency.

[0050] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

Claims

1. A fume extraction device for safe welding of investment casting tree assembly, characterized in that, include: The cover (1) has a flange structure for connecting to the pipe on its upper side. The upper part of the cover (1) is fixedly connected to the mounting frame (2). The mounting frame (2) is provided with a mounting cylinder (3). The mounting cylinder (3) is provided with a drive shaft (4). The lower end of the drive shaft (4) is fixedly connected to several condensation meshes (5). The condensation meshes (5) are used to cause the wax in the flue gas to condense on their surface when the flue gas passes through. All the condensation meshes (5) are fixedly connected to a ring mesh (6) on their periphery. The cover (1) is provided with a heating collection component for cleaning and collecting the wax attached to the condensation meshes (5) and the ring mesh (6) near the ring mesh (6). The heating and collection assembly includes: A collection shell (7) is disposed on the periphery of the ring mesh (6). The collection shell (7) is used to collect the wax condensed on the surface of the condensation mesh (5) and the ring mesh (6). A mounting frame (8) is fixedly connected inside the cover (1) near the ring mesh (6). A heating wire (9) is installed on the mounting frame (8). The projection of the collection shell (7) on the horizontal plane is located within the projection of the mounting frame (8) on the horizontal plane, and the collection shell (7) and the mounting frame (8) are coaxial. A heat-conducting ring (10) is fixedly connected to the upper condensation mesh (5) and contacts the collection shell (7). The collection shell (7) and the heat-conducting ring (10) are used together to transfer the heat generated by the heating wire (9) to the ring mesh (6) and all the condensation meshes (5).

2. The fume extraction device for safe welding of investment casting tree assembly according to claim 1, characterized in that, The horizontal height of the middle part of the condensation mesh (5) is greater than the horizontal height of its edge.

3. The fume extraction device for safe welding of investment casting tree assembly according to claim 1, characterized in that, An elastic ring (11) is fixedly connected to the upper part of the inner side of the collection shell (7). The elastic ring (11) abuts against the condensation mesh (5) on the upper side. All the outer peripheral sides of the condensation mesh (5) and the ring mesh (6) together form a cylindrical surface. An elastic sheet (12) is fixedly connected to the outer peripheral side of the ring mesh (6). The elastic sheet (12) is used to limit the elastic ring (11).

4. The fume extraction device for safe welding of investment casting tree assembly according to claim 3, characterized in that, There are two condensation meshes (5). In the direction from the inside to the outside of the ring mesh (6), the aperture of the mesh hole of the lower condensation mesh (5) gradually decreases, and the aperture of the mesh hole of the upper condensation mesh (5) gradually increases, and there is a gap between the two condensation meshes (5).

5. The fume extraction device for safe welding of investment casting tree assembly according to claim 4, characterized in that, The lowest point inside the collection shell (7) is located below the two condensation nets (5), and there is a gap between the lower condensation net (5) and the collection shell (7) in the vertical direction.

6. The fume extraction device for safe welding of investment casting tree assembly according to claim 4, characterized in that, The mounting bracket (2) is rotatably connected to the mounting cylinder (3). The mounting cylinder (3) is fixedly connected to a centrifugal impeller (15) via a connecting rod. The centrifugal impeller (15) is coaxial with the ring net (6) and located above the ring net (6). The centrifugal impeller (15) corresponds to the heating wire (9) in the vertical direction. The centrifugal impeller (15) is used to guide the flue gas through the heating wire (9). A guide shell (16) is fixedly connected to the lower side of the cover (1). A guide cover (17) is fixedly connected to the guide shell (16). The collection shell (7) is in contact with the guide cover (17). An annularly distributed exhaust channel (161) is provided near the guide cover (17) of the guide shell (16). The exhaust channel (161) is used to discharge the flue gas between the cover (1) and the guide cover (17) to the inside of the guide cover (17).

7. A fume extraction device for safe welding of investment casting tree assembly according to claim 6, characterized in that, The mounting cylinder (3) is splinedly connected to the drive shaft (4).

8. A fume extraction device for safe welding of investment casting tree assembly according to claim 6, characterized in that, The inner circumference of the condensation mesh (5), the inner side of the guide cover (17), and the lower side of the collection shell (7) are all trumpet-shaped annular curved surfaces. The angle between the generatrix of the annular curved surface on the inner circumference of the condensation mesh (5) and the horizontal plane is smaller than the angle between the generatrix of the annular curved surface on the inner side of the guide cover (17) and the horizontal plane. The angle between the generatrix of the annular curved surface on the inner side of the guide cover (17) and the horizontal plane is equal to the angle between the generatrix of the annular curved surface on the lower side of the collection shell (7) and the horizontal plane.

9. A fume extraction device for safe welding of investment casting tree assembly according to claim 7, characterized in that, A fan (18) is fixedly connected to the upper part of the drive shaft (4), and the fan (18) is located inside the cover (1).

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