Dust removal device for high-iron casting sand shell production line

Abstract

The utility model discloses a dust collector for high -speed rail foundry goods sand shell production line, fixed mounting has a plurality of containing cylinder on the inner partition of box, and the upper end of containing cylinder is equipped with the guide cone. The bag mouth part of filter cloth bag is fixed between the guide cone and the upper port of containing cylinder. The inner end of the water jet pipe for connecting the pressure water source is connected with a plurality of nozzles of the jet direction one -to -one correspondingly towards each guide cone through the water jet branch pipe. The dust collection drawer of being located below the partition and the bottom side being the water seepage net is installed in the box, and the dust collection drawer below has the water collecting chamber, and the top is the transition chamber. The total inlet pipe inner end communicates with the transition chamber, and the outer end connects the dust inlet pipe. Still include the main drain pipe of inner end intercommunication water collecting chamber and the vice drain pipe of inner end intercommunication the space above the partition. The utility model realizes the sand powder filter cloth bag's exempt from disassembly and wash, not only convenient operation, and because of washing period shortening, has improved the work efficiency of production line.

Description

Technical Field

[0001] This utility model relates to a dust removal and filtration device, specifically a dust removal and filtration device with a cleaning function. The dust removal device is mainly used for dust filtration in casting sand shell production lines. Background Technology

[0002] Shell casting, a commonly used casting method, utilizes thin-shell molds to produce castings, offering advantages such as ease of production, high efficiency, low sand consumption, and high dimensional accuracy. In recent years, it has been widely applied in the casting production of key components in the automotive, high-speed rail, and other fields.

[0003] The casting production of these components generally relies on a sand shell production line. During operation, the formulated sand shell raw materials are first fed into a auger mechanism, where they are mixed and then conveyed and extruded to a vibrating mechanism. A polishing mechanism then polishes the surface of the sand shell to improve its smoothness and dimensional accuracy. During the polishing process, the generated sand powder needs to be filtered to ensure safe equipment operation and a clean working environment.

[0004] For example, Chinese invention patent application CN118002751A discloses "a production line and method for producing sand shells for high-speed rail castings." Its conveying pipeline is connected to a dust collector, inside which a filter cartridge is installed, and a dust collection hopper is located below the filter cartridge. The dust collector is connected to the conveying pipeline via an air inlet pipe, and an exhaust fan is installed on the conveying pipeline. The air inlet of the exhaust fan is connected to the dust collector via a connecting pipe. The exhaust fan and filter cartridge promptly remove sand dust generated during the polishing process.

[0005] In practical use, it was found that sand powder easily clogs the mesh of the filter cartridge, thus requiring frequent cleaning and even replacement of the filter cartridge. The disassembly, cleaning, and installation of the filter cartridge are not only cumbersome but also, due to the long cycle, severely impact the normal operation of the entire production line, thus restricting the company's production efficiency. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a dust removal device for a high-speed rail casting sand shell production line, so as to achieve sand powder filter screen (bag) cleaning without disassembly.

[0007] The technical solution of this utility model is as follows: A dust removal device for a high-speed rail casting sand shell production line includes a housing, a dust inlet pipe for receiving dust, and an exhaust pipe for discharging clean air. The exhaust pipe is connected to an induced draft fan. A partition is installed inside the housing, and several accommodating cylinders, whose lower ends communicate with the space below the partition, are fixedly installed on the partition. Guide cones are installed at the upper ends of the accommodating cylinders. The dust removal device also includes filter bags, the openings of which are fixed between the guide cones and the upper ends of the accommodating cylinders. The dust removal device also includes a water spray pipe whose outer end is connected to a pressurized water source and a third valve. Inside the water spray pipe... The end is connected to several nozzles with spray directions corresponding to each guide cone via water spray branch pipes; a dust collection drawer located below the partition and with a water-permeable mesh on the bottom side is installed in the box, the dust collection drawer has a water collection chamber below and a transition chamber above; a main inlet pipe is installed on one side wall of the box, the inner end of the main inlet pipe is connected to the transition chamber, and the outer end is connected to the dust inlet pipe; the inner end of the exhaust pipe is connected to the space above the partition; the dust removal device also includes a main drain pipe with its inner end connected to the water collection chamber and a secondary drain pipe with its inner end connected to the space above the partition; a second valve is installed on the main drain pipe.

[0008] Furthermore, the main body of the guide cone is a frustum-shaped cylinder with an upper port diameter larger than the lower port diameter; the lower end of the frustum-shaped cylinder is connected to a snap-fit ​​cylinder, which snaps and fixes the bag opening of the filter bag to the outer wall of the receiving cylinder.

[0009] Furthermore, a drying gas inlet pipe is connected to the outer end of the main inlet pipe; a first valve is installed on the dust inlet pipe; and a fourth valve is installed on the drying gas inlet pipe.

[0010] Furthermore, the outer end of the secondary drain pipe is connected to the main drain pipe, and the connection between the secondary drain pipe and the main drain pipe is located between the housing and the second valve.

[0011] Furthermore, an inclined guide plate is installed on the bottom side of the water collection chamber, and the main drain pipe is connected to the lower end of the guide plate.

[0012] This utility model has the following beneficial effects: First, when the filter bags need cleaning after a period of use, close the control valve of the dust inlet pipe and the induced draft fan, and open the control valves on the water spray pipe and the drain pipe. Using the water pressure from the tap water network or the water pump, the nozzles spray water onto the corresponding filter bags. Guided by the guide cone, the filter bags flip downwards and enter the receiving cylinder. The cleaning water carries the dust clogging the filter bag mesh into the dust collection drawer and water collection chamber. The water in the water collection chamber is discharged through the main drain pipe, and the water on the partition is discharged through the auxiliary drain pipe. Larger particles accumulate in the dust collection drawer. When a certain amount has accumulated, pull out the dust collection drawer and empty it. This invention achieves non-disassembly cleaning of sand and powder filter bags, which is not only convenient to operate but also improves the working efficiency of the production line due to the shortened cleaning cycle.

[0013] Secondly, the optimized technical solution of this utility model adopts a bag drying mechanism, which can dry the cleaned filter bag in a short time with the help of room temperature air or hot air, so as to reduce the degree of dust adhesion on the filter bag.

[0014] Third, in the optimized technical solution of this utility model, the main body of the guide cone is in the form of a grid frame frustum cylinder, so that the filter bag is blocked by the guide cone less, the effective filtration area is larger, and the filtration efficiency is higher. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 This is a top view of the internal structure of the box in an embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of the shape of the frustum-shaped cylinder in an embodiment of this utility model.

[0018] Figure 4 This is a schematic diagram of the shape of the frustum-shaped cylinder of the space frame in an embodiment of this utility model.

[0019] 1. Housing; 2. Partition; 3. Drying air inlet pipe; 4. Dust inlet pipe; 5. Main inlet pipe; 6. Water collection chamber; 7. Dust collection drawer; 8. Main drain pipe; 9. Secondary drain pipe; 10. Water spray pipe; 10-1. Water spray branch pipe; 11. Exhaust pipe; 12. Exhaust fan; 13. Nozzle; 14. Filter bag; 15. Guide cone; 15-1. Snap-fit ​​cylinder; 15-2. Mesh frame; 16. Receiving cylinder; 17. Transition chamber; 18. Baffle plate; F1. First valve; F2. Second valve; F3. Third valve; F4. Fourth valve. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0021] like Figure 1 The embodiment of this utility model includes a housing 1, a dust inlet pipe 4 for receiving dust, and an exhaust pipe 11 for discharging clean air, wherein the exhaust pipe 11 is connected to an induced draft fan 12. A partition 2 is also installed inside the housing 1. Several (nine in this embodiment) accommodating cylinders 16, whose lower ends communicate with the lower chamber of the partition 2, are fixedly installed on the partition 2. A guide cone 15 is snapped (e.g., tightly fitted) onto the upper end of each accommodating cylinder 16. This embodiment also includes a flexible filter bag 14, the opening of which is fixed between the guide cone 15 and the upper port of the accommodating cylinder 16.

[0022] The filter bag 14 is generally made of nylon, polypropylene (PP), or polyester (PE) material.

[0023] The main body of the guide cone 15 can be a frustum-shaped cylinder with an upper port diameter larger than the lower port diameter. For example... Figure 3 The main body of the guide cone 15 can also be a frustum-shaped cylindrical structure with an upper port diameter larger than the lower port diameter, such as... Figure 4 That is, the wall of the truncated cone is a grid frame 15-2.

[0024] In the two types of guide cones 15 described above, a snap-fit ​​cylinder 15-1 is connected to the lower end of the frustum cylinder. The inner diameter of the snap-fit ​​cylinder 15-1 is slightly larger than the outer diameter of the receiving cylinder 16. The bag opening of the filter bag 14 is snapped and fixed to the outer wall of the receiving cylinder 16 by the snap-fit ​​cylinder 15-1.

[0025] This embodiment also includes a water spray pipe 10 whose outer end is connected to a pressurized water source and a third valve F3. The inner end of the water spray pipe 10 is connected to a plurality of nozzles 13, each with a spray direction corresponding to a guide cone 15, via a water spray branch pipe 10-1. The pressurized water source includes, for example, a tap water network and a water supply pump.

[0026] The housing 1 contains a dust collection drawer 7 located below the partition 2, with a permeable mesh at the bottom. The dust collection drawer 7 has a water collection chamber 6 at the bottom and a transition chamber 17 at the top. To prevent leakage, inwardly protruding sealing strips are installed along the four perimeters of the outer end plate of the dust collection drawer 7. Correspondingly, sealing grooves are provided at corresponding positions on both the housing 1 and the outer end plate of the dust collection drawer 7. The sealing strips are inserted into the corresponding sealing grooves to achieve a seal on the dust collection drawer 7.

[0027] A main inlet pipe 5 is installed on one side wall of the housing 1. The inner end of the main inlet pipe 5 communicates with the transition chamber 17, and the outer end is connected to the dust inlet pipe 4. The inner end of the exhaust pipe 11 is installed on the top wall of the housing 1 and communicates with the space above the partition 2.

[0028] Furthermore, a drying gas inlet pipe 3 is connected to the outer end of the main inlet pipe 5. A first valve F1 is installed on the dust inlet pipe 4, and a fourth valve F4 is installed on the drying gas inlet pipe 3.

[0029] This embodiment also includes a main drain pipe 8 whose inner end connects to the water collection chamber 6 and a secondary drain pipe 9 whose inner end connects to the space above the partition 2. A second valve F2 is installed on the main drain pipe 8. To improve the drainage speed, an inclined guide plate 18 is installed on the bottom side of the water collection chamber 6, and the main drain pipe 8 is connected to the lower end of the guide plate 18.

[0030] Furthermore, the outer end of the secondary drain pipe 9 is connected to the main drain pipe 8, and the connection position between the secondary drain pipe 9 and the main drain pipe 8 is located between the housing 1 and the second valve F2.

[0031] During normal dust removal operation, the third valve F3, the fourth valve F4, and the second valve F2 are all closed, the first valve F1 is open, and the induced draft fan 12 is working. The sand powder introduced from the polishing process is drawn in by the induced draft fan 12 and passes sequentially through the dust inlet pipe 4, the main inlet pipe 5, the transition chamber 17, and the accommodating cylinder 16 to reach the filter bag 14. The dust-laden air blows the filter bag 14 upwards to an expanded state, and the dust particles are blocked by the filter bag 14 and fall into the dust collection drawer 7.

[0032] The methods for determining the degree of filter bag clogging are existing technologies. For example, a flow meter can be installed on the exhaust duct 11. If the flow rate drops abnormally, it indicates that the filter bag needs cleaning. Another example is when the current of the induced draft fan 12 increases abnormally, indicating that the fan is operating under overload to maintain airflow; in this case, it indicates that the filter bag needs cleaning.

[0033] During filter bag cleaning, first close the first valve F1 and the induced draft fan 12, and open the third valve F3 and the second valve F2. The nozzle 13 sprays water onto the corresponding filter bag 14. Guided by the guide cone 15, the filter bag 14 flips downwards and enters the receiving cylinder 16. The cleaning water carries the dust clogging the filter bag mesh into the dust collection drawer 7 and the water collection chamber 6. The water in the water collection chamber 6 is discharged through the main drain pipe 8, and the water on the partition 2 is discharged through the auxiliary drain pipe 9. Larger particles accumulate in the dust collection drawer 7. When a certain amount accumulates, pull out the dust collection drawer 7 and empty it.

[0034] After the filter bags are cleaned, close the third valve F3 and the second valve F2, open the fourth valve F4, and start the induced draft fan 12. Normal temperature air or hot air is blown in through the drying air inlet pipe 3, and the filter bags 14 flip upwards and expand until they are dry.

Claims

1. A dust removal device for a high-speed rail casting sand shell production line, comprising a housing (1), a dust inlet pipe (4) for receiving dust, and an exhaust pipe (11) for discharging clean air, wherein the exhaust pipe (11) is connected to an induced draft fan (12), characterized in that: The housing (1) is equipped with a partition (2), and several accommodating cylinders (16) with their lower ends communicating with the space below the partition (2) are fixedly installed on the partition (2); guide cones (15) are installed on the upper ends of the accommodating cylinders (16); the dust removal device also includes a filter bag (14), the opening of which is fixed between the guide cone (15) and the upper port of the accommodating cylinder (16); the dust removal device also includes a water spray pipe (10) with its outer end connected to a pressurized water source and connected to a third valve (F3), the inner end of which is connected to several spray directions corresponding to each guide cone (15) through a water spray branch pipe (10-1). Nozzle (13); A dust collection drawer (7) located below the partition (2) and with a water-permeable mesh on the bottom side is installed in the housing (1). The dust collection drawer (7) has a water collection chamber (6) below and a transition chamber (17) above; A main inlet pipe (5) is installed on one side wall of the housing (1). The inner end of the main inlet pipe (5) is connected to the transition chamber (17), and the outer end is connected to the dust inlet pipe (4); The inner end of the exhaust pipe (11) is connected to the space above the partition (2); The dust removal device also includes a main drain pipe (8) whose inner end is connected to the water collection chamber (6) and a secondary drain pipe (9) whose inner end is connected to the space above the partition (2); A second valve (F2) is installed on the main drain pipe (8).

2. The dust removal device for a high-speed rail casting sand shell production line according to claim 1, characterized in that: The main body of the guide cone (15) is a frustum-shaped cylinder with an upper port diameter larger than the lower port diameter; the lower end of the frustum-shaped cylinder is connected to a snap-fit ​​cylinder (15-1), which snaps and fixes the bag opening of the filter bag (14) to the outer wall of the receiving cylinder (16).

3. The dust removal device for a high-speed rail casting sand shell production line according to claim 1, characterized in that: The outer end of the main inlet pipe (5) is also connected to a drying gas inlet pipe (3); a first valve (F1) is installed on the dust inlet pipe (4); and a fourth valve (F4) is installed on the drying gas inlet pipe (3).

4. The dust removal device for a high-speed rail casting sand shell production line according to claim 1, 2, or 3, characterized in that: The outer end of the secondary drain pipe (9) is connected to the main drain pipe (8), and the connection between the secondary drain pipe (9) and the main drain pipe (8) is located between the housing (1) and the second valve (F2).

5. The dust removal device for a high-speed rail casting sand shell production line according to claim 1, 2, or 3, characterized in that: An inclined guide plate (18) is installed on the bottom side of the water collection chamber (6), and the main drain pipe (8) is connected to the lower side of the guide plate (18).

6. The dust removal device for a high-speed rail casting sand shell production line according to claim 4, characterized in that: An inclined guide plate (18) is installed on the bottom side of the water collection chamber (6), and the main drain pipe (8) is connected to the lower side of the guide plate (18).

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