Sand recovery device for coated sand heating furnace

Abstract

The utility model provides a kind of sand recovery device for coated sand heating furnace, including respectively with the side of heating furnace intercommunication's inlet pipe and recovery pipe, respectively with the inlet pipe and recovery pipe connection's recovery assembly, inlet pipe is provided with two, recovery assembly includes cylinder portion, with the conical hopper portion of cylinder portion bottom intercommunication, cylinder portion top side is provided with exhaust pipe, the bottom end of exhaust pipe is inserted to the inside of cylinder portion, the top end of exhaust pipe is connected with flue, recovery pipe is connected with the bottom end of conical hopper portion, the side of cylinder portion is oppositely provided with two connecting pipes, two inlet pipes are respectively connected with connecting pipe.The sand recovery device for coated sand heating furnace provided by the utility model, by setting two inlet pipes between recovery assembly and heating furnace, two connecting pipes connected with inlet pipe respectively guide flue gas into cylinder portion, the separation and recovery efficiency of flue gas and coated sand is higher, inlet pipe and recovery pipe are respectively connected with heating furnace by support frame, so that the installation of recovery device is more convenient and fast.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, specifically to a sand recovery device for a coated sand heating furnace. Background Technology

[0002] In the foundry industry, coated sand heating furnaces are important equipment used for the production or regeneration of coated sand. They achieve the coating of resin film on the surface of sand particles or the removal of resin film from old sand through precise temperature control. During operation, a large amount of high-temperature flue gas containing sand is generated, and the fine sand in the flue gas needs to be recovered. Due to the large amount of flue gas in the heating furnace, existing sand recovery often uses multiple recovery devices connected in parallel to achieve the recovery of fine sand.

[0003] However, when multiple sand recovery devices are connected in parallel, they not only occupy a large space and have low recovery efficiency of coated sand, but also have a complex structure that leads to low construction and installation efficiency, making it difficult to meet the needs of large coated sand heating furnaces. This solution addresses this technical problem. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a sand recovery device for a coated sand heating furnace. By setting two flue gas inlet pipes between the recovery component and the heating furnace, and two connecting pipes connected to the flue gas inlet pipes respectively to guide the flue gas into the cylindrical part, the separation and recovery efficiency of flue gas and coated sand is high, and the size of the recovery component is more compact. By connecting the flue gas inlet pipe and the recovery pipe to the heating furnace through a support frame, the installation of the recovery device is more convenient and quick.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a sand recovery device for a coated sand heating furnace, comprising a flue gas inlet pipe and a recovery pipe respectively connected to the side of the heating furnace, and a recovery assembly respectively connected to the flue gas inlet pipe and the recovery pipe. Two flue gas inlet pipes are provided. The recovery assembly includes a cylindrical part and a conical hopper part connected to the bottom of the cylindrical part. An exhaust pipe is provided on the top side of the cylindrical part. The bottom end of the exhaust pipe is inserted into the interior of the cylindrical part. The top end of the exhaust pipe is connected to the flue. The recovery pipe is connected to the bottom end of the conical hopper part. Two connecting pipes are provided opposite to each other on the side of the cylindrical part. The two flue gas inlet pipes are respectively connected to the connecting pipes.

[0006] The cylindrical portion is characterized in that two guide portions are arranged opposite each other on both sides, the top ends of the two connecting pipes are inserted into the inner side of the guide portion from the bottom side of the guide portion, the top end of the smoke inlet pipe is higher than the bottom end of the exhaust pipe, and the exhaust ports of the two guide portions are arranged tangentially on the side of the cylindrical portion.

[0007] Each of the flue gas inlet pipes is provided with a flange at its top end and a flange at its bottom end; the flue gas inlet pipe is connected to the flange of the connecting pipe. The bottom end of the conical hopper is provided with a flange, and the top end of the recovery pipe is provided with a flange. The conical hopper is connected to the flange of the recovery pipe. The flue gas inlet pipe and the recovery pipe are respectively welded to the heating furnace.

[0008] The heating furnace is provided with a support frame on its side, and the recovery pipe and the two flue gas inlet pipes are all mounted on the support frame.

[0009] The support frame includes a bearing frame, a bracket mounted on the bearing frame, and a connecting rod hinged at one end to the side of the bearing frame. The other end of the connecting rod is hinged to a hinge block one. The bearing frame is hinged to two hinge blocks two at each end. The hinge block one and the hinge block two are welded to the side of the heating furnace. The side of the connecting rod is provided with a pin hole one and a pin hole two, respectively. The hinge block one is hinged to the connecting rod through the pin hole one and the pin hole two.

[0010] The support frame is provided with several connection holes 1 that connect to the flange 1, and the bracket is provided with several connection holes 2 that connect to the flange 4.

[0011] An arc-shaped guide surface is provided on the top side of the flow guide.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) By setting two flue gas inlet pipes between the recovery component and the heating furnace, and connecting two pipes connected to the flue gas inlet pipes respectively, the flue gas is introduced into the cylindrical part, and the coated sand and gas are centrifugally separated, which increases the processing air volume of the recovery component, reduces the eddy or turbulence caused by unilateral flow, makes the recovery component more compact, and has a higher separation and recovery efficiency of flue gas and coated sand.

[0014] (2) By connecting the flue gas inlet pipe and the recovery pipe to the heating furnace through the support frame, the heating furnace is hinged on the heating furnace through hinge block one and hinge block two. The angle of the support frame is fixed through the connecting pipe. On the one hand, it makes it more efficient, quick and accurate to open holes in the heating furnace. On the other hand, after the flue gas inlet pipe and the recovery pipe are welded to the heating furnace, they are more firmly fixed by the support frame.

[0015] (3) By connecting flange one and flange two together through connection hole one on the bearing frame, and connecting flange four and flange three together through connection hole two on the bracket, the connecting pipe and cone bucket are more firmly and reliably fixed to the support frame, and the installation of the recycling components is more convenient and quick. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall external structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the transverse cross-sectional structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the connection structure between the smoke inlet pipe and the support frame of this utility model;

[0020] Figure 5 This is a structural schematic diagram of the support frame of this utility model;

[0021] Figure 6 This is a schematic diagram of the installation of the smoke inlet pipe of this utility model.

[0022] In the diagram: 1. Smoke inlet pipe; 11. Flange 1; 2. Recovery pipe; 21. Flange 4; 3. Recovery assembly; 31. Cylindrical section; 32. Conical hopper section; 321. Flange 3; 33. Connecting pipe; 331. Flange 2; 34. Guide section; 341. Arc-shaped guide surface; 4. Exhaust pipe; 5. Support frame; 51. Bearing frame; 511. Connecting hole 1; 52. Bracket; 521. Connecting hole 2; 53. Connecting rod; 531. Pin hole 1; 532. Pin hole 2; 54. Hinge block 1; 55. Hinge block 2; 6. Heating furnace. Detailed Implementation

[0023] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0024] See Figures 1-6 A sand recovery device for a coated sand heating furnace includes a flue gas inlet pipe 1 and a recovery pipe 2 connected to the side of the heating furnace 6, and a recovery assembly 3 connected to the flue gas inlet pipe 1 and the recovery pipe 2. There are two flue gas inlet pipes 1. The recovery assembly 3 includes a cylindrical part 31 and a conical part 32 connected to the bottom of the cylindrical part 31. An exhaust pipe 4 is provided on the top side of the cylindrical part 31. The bottom end of the exhaust pipe 4 is inserted into the interior of the cylindrical part 31, and the top end of the exhaust pipe 4 is connected to the flue. The recovery pipe 2 is connected to the bottom end of the conical part 32. Two connecting pipes 33 are provided opposite to each other on the side of the cylindrical part 31. The two flue gas inlet pipes 1 are respectively connected to the connecting pipes 33.

[0025] The cylindrical portion 31 is characterized by having two guide portions 34 facing each other on both sides, the top ends of the two connecting pipes 33 being inserted from the bottom side of the guide portion 34 into the inner side of the guide portion 34, the top end of the smoke inlet pipe 1 being higher than the bottom end of the exhaust pipe 4, and the exhaust ports of the two guide portions 34 being arranged tangentially on the side of the cylindrical portion 31.

[0026] Each flue pipe 1 is equipped with a flange 11 at its top end and a flange 331 at its bottom end, and the flue pipe 1 is connected to the flange of the connecting pipe 33; the bottom end of the conical hopper 32 is equipped with a flange 321, and the top end of the recovery pipe 2 is equipped with a flange 21, and the conical hopper 32 is connected to the flange of the recovery pipe 2; the flue pipe 1 and the recovery pipe 2 are respectively welded to the heating furnace 6.

[0027] A support frame 5 is provided on the side of the heating furnace 6, and the recovery pipe 2 and two flue gas inlet pipes 1 are all installed on the support frame 5.

[0028] The support frame 5 includes a bearing frame 51, a bracket 52 mounted on the bearing frame 51, and a connecting rod 53 hinged at one end to the side of the bearing frame 51. The other end of the connecting rod 53 is hinged to a first hinge block 54. The bearing frame 51 is hinged to two hinge blocks 55 at both ends. The first hinge block 54 and the second hinge block 55 are welded to the side of the heating furnace 6. The side of the connecting rod 53 is provided with a first pin hole 531 and a second pin hole 532. The first hinge block 54 is hinged to the connecting rod 53 through the first pin hole 531 and the second pin hole 532.

[0029] The support frame 51 is provided with several connection holes 511 for connecting to flange 11, and the bracket 52 is provided with several connection holes 521 for connecting to flange 21.

[0030] An arc-shaped guide surface 341 is provided on the top side of the flow guide 34.

[0031] The specific working process of this utility model:

[0032] First, the two flue pipes 1 are temporarily fixed to the connection hole 511 of the bearing frame 51 through flange 11. Then, the recovery pipe 2 is temporarily fixed to the connection hole 521 of the bracket 52 through flange 4 21. Then, the hinge block 1 54 and hinge block 2 55 of the support frame 5 are welded and fixed to the side of the heating furnace 6. Then, the flue pipe 1 and the recovery pipe 2 are welded to the heating furnace 6 respectively.

[0033] The specific welding steps are as follows:

[0034] Step 1: First, the support frame 5 lowers the ends of the smoke inlet pipe 1 and the recovery pipe 2 to contact the side of the heating furnace 6; the connecting rod 53 and the hinge block 1 54 are connected by bolts that pass through the pin hole 2 532. At this time, draw the edge line along the outer edge of the smoke inlet pipe 1 and the recovery pipe 2 with a marker.

[0035] Step 2: Remove the bolts in pin hole 2 532, rotate the bearing frame 51 of the support frame 5 along the hinge block 2 55 until the pin hole 1 531 of the connecting rod 53 reaches the position of the hinge block 1 54, and then insert the bolts into pin hole 1 531 to fix the support frame 5. At this time, the flue pipe 1 and the recovery pipe 2 are separated from the side wall of the heating furnace 6.

[0036] Step 3: Cut an opening inside the edge line marked by the marker on the heating furnace 6 using an oxy-fuel cutter. At this time, the opening size is consistent with the end cross-sectional shape of the flue gas inlet pipe 1 and the recovery pipe 2.

[0037] Step 4: Remove the bolts in pin hole 1 531, rotate the support frame 5 until the smoke inlet pipe 1 and the recovery pipe 2 are in contact with the edge of the opening of the heating furnace 6, and then insert the bolts into pin hole 2 532 to fix the support frame 5.

[0038] Step 5: Weld the flue gas inlet pipe 1 and the recovery pipe 2 to the heating furnace 6.

[0039] After the flue gas inlet pipe 1 and the recovery pipe 2 are welded to the heating furnace 6, the temporary fixing bolts on flange 11 and flange 4 are removed. Then, the recovery assembly 3 is lifted and installed. Specifically, flange 321 on the cone hopper 32, flange 21 on the recovery pipe 2, and connection hole 521 on the bracket 52 are aligned and connected in sequence with fastening bolts. Flange 331 on the connecting pipe 33, flange 11 on the flue gas inlet pipe 1, and connection hole 511 on the bearing frame 51 are connected in sequence with fastening bolts. Finally, the exhaust pipe 4 is connected to the flue to complete the installation of the recovery assembly 3.

[0040] In use, the flue gas in the heating furnace 6 is drawn into the connecting pipe 33 through the flue gas inlet pipe 1 by the suction force of the flue. It then enters the guide section 34 of the recovery component 3 through the two connecting pipes 33. Guided by the arc-shaped guide surface 341, the two flue gases rotate in the cylindrical section 31 to form centrifugal force. Under the action of centrifugal force, most of the coated sand in the flue gas is thrown out into the conical hopper section 32 and separated from the gas. Finally, it is discharged and recovered into the heating furnace 6 through the recovery pipe 2 at the bottom of the conical hopper. The gas is discharged through the exhaust pipe 4, and the remaining small part of the coated sand can be collected by the dust collector on the flue.

[0041] By setting two flue gas inlet pipes 1 between the recovery component 3 and the heating furnace 6, and two connecting pipes 33 connected to the flue gas inlet pipes 1 respectively, the flue gas is introduced into the cylindrical part 31, and the coated sand and gas are centrifugally separated. This increases the processing air volume of the recovery component 3, reduces the eddies or turbulence caused by unilateral flow, makes the recovery component 3 more compact, and achieves higher separation and recovery efficiency of flue gas and coated sand.

[0042] By connecting the flue gas inlet pipe 1 and the recovery pipe 2 to the heating furnace 6 via the support frame 5, and hinged to the heating furnace 6 via hinge block 1 54 and hinge block 2 55, and fixing the angle of the support frame 5 via the connecting pipe 33, it is possible to make the drilling of holes in the heating furnace 6 more efficient, quick, precise and reliable. On the other hand, after the flue gas inlet pipe 1 and the recovery pipe 2 are welded to the heating furnace 6, they are more firmly fixed by the support frame 5, and at the same time, it is easier and quicker to maintain and repair the recovery device later.

[0043] By connecting flange 11 and flange 2 331 together through connection hole 1 511 on the bearing frame 51, and connecting flange 4 21 and flange 3 321 together through connection hole 2 521 on the bracket 52, the connecting pipe 33 and the cone hopper 32 are more firmly and reliably fixed to the support frame 5, and the installation of the recycling component 3 is more convenient and quick.

[0044] Compared to the existing technology where a single connecting pipe 33 in the 1300kW furnace results in a 20kg loss of fine sand per hour in the heating furnace 6, the present solution, with two connecting pipes 33 for air intake, reduces the hourly loss of fine sand in the heating furnace 6 to 1.5kg. This also results in higher recovery efficiency of the coated sand and greater savings in fine sand costs. In this embodiment, the diameter of each connecting pipe 33 is 300mm, and the air volume is 700m³ / h.

[0045] Technical features not described in detail in this solution are based on conventional operations and general understanding of those skilled in the art, and are therefore not elaborated upon here. Technical features not described in this utility model can be implemented using existing technology, and will not be repeated here. Of course, the above description is not intended to limit this utility model, nor is it limited to the examples given above. Any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model should also fall within the protection scope of this utility model.

Claims

1. A sand recovery device for a coated sand heating furnace, characterized in that, It includes a flue gas inlet pipe (1) and a recovery pipe (2) that are respectively connected to the side of the heating furnace (6), and a recovery assembly (3) that is respectively connected to the flue gas inlet pipe (1) and the recovery pipe (2). There are two flue gas inlet pipes (1). The recovery assembly (3) includes a cylindrical part (31) and a conical part (32) that is connected to the bottom of the cylindrical part (31). An exhaust pipe (4) is provided on the top side of the cylindrical part (31). The bottom end of the exhaust pipe (4) is inserted into the interior of the cylindrical part (31). The top end of the exhaust pipe (4) is connected to the flue. The recovery pipe (2) is connected to the bottom end of the conical part (32). Two connecting pipes (33) are provided opposite to each other on the side of the cylindrical part (31). The two flue gas inlet pipes (1) are respectively connected to the connecting pipes (33).

2. The sand recovery device for a coated sand heating furnace according to claim 1, characterized in that, Two guide sections (34) are arranged opposite each other on both sides of the cylindrical part (31). The top ends of the two connecting pipes (33) are inserted into the inner side of the guide section (34) from the bottom side of the guide section (34). The top end of the smoke inlet pipe (1) is higher than the bottom end of the exhaust pipe (4). The smoke outlets of the two guide sections (34) are arranged tangentially on the side of the cylindrical part (31).

3. The sand recovery device for a coated sand heating furnace according to claim 2, characterized in that, Each of the flue gas inlet pipes (1) is provided with a flange one (11) at the top end, and a flange two (331) is provided with a flange at the bottom end of the connecting pipe (33). The flue gas inlet pipe (1) is connected to the flange of the connecting pipe (33). The bottom end of the cone-shaped part (32) is provided with a flange three (321), and the top end of the recovery pipe (2) is provided with a flange four (21). The cone-shaped part (32) is connected to the flange of the recovery pipe (2). The flue gas inlet pipe (1) and the recovery pipe (2) are respectively welded to the heating furnace (6).

4. The sand recovery device for a coated sand heating furnace according to claim 3, characterized in that, The heating furnace (6) is provided with a support frame (5) on its side, and the recovery pipe (2) and the two smoke inlet pipes (1) are all provided on the support frame (5).

5. The sand recovery device for a coated sand heating furnace according to claim 4, characterized in that, The support frame (5) includes a bearing frame (51), a bracket (52) mounted on the bearing frame (51), and a connecting rod (53) hinged at one end to the side of the bearing frame (51). The other end of the connecting rod (53) is hinged to a first hinge block (54). The two ends of the bearing frame (51) are respectively hinged to second hinge blocks (55). The first hinge block (54) and the second hinge block (55) are respectively welded to the side of the heating furnace (6). The side of the connecting rod (53) is respectively provided with a first pin hole (531) and a second pin hole (532). The first hinge block (54) is hinged to the connecting rod (53) through the first pin hole (531) and the second pin hole (532).

6. The sand recovery device for a coated sand heating furnace according to claim 5, characterized in that, The support frame (51) is provided with a plurality of connection holes 1 (511) connected to the flange 1 (11), and the bracket (52) is provided with a plurality of connection holes 2 (521) connected to the flange 4 (21).

7. The sand recovery device for a coated sand heating furnace according to claim 3, characterized in that, The top side of the flow guide (34) is provided with an arc-shaped guide surface (341).

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