Cast steel shot heat treatment workshop dust removal device

Abstract

The utility model relates to the technical field of workshop dust removal devices, in particular to a cast steel shot heat treatment workshop dust removal device which comprises a support and is characterized in that a high-temperature-resistant box body is installed on the support, a conical dust hopper is installed at the bottom of the high-temperature-resistant box body, and an electric dust discharging valve is arranged at the bottom of the conical dust hopper. The outer wall of the high-temperature-resistant box body is provided with crossed reinforcing ribs, the edge of the inner wall of the high-temperature-resistant box body is provided with a film-coated glass fiber filter bag group, the top of the high-temperature-resistant box body is provided with a high-pressure centrifugal ventilator, and the high-temperature-resistant dust treatment problem is systematically solved through the high-temperature-resistant box body, a film-coated filter bag array, intelligent pulse blowback and airflow optimization design. A 310S stainless steel and aluminum silicate fiber double-layer heat insulation box body is adopted, and external reinforcing ribs are combined, so that high-temperature stable operation is ensured; the PTFE film-covered filter bags with the length of 6m are arranged in a rhombus shape to enlarge the filter area, and efficient self-cleaning is realized by matching with equidistant pulse blowing; the conical branch pipe of the drainage air pipe balances airflow and reduces dead angles.

Description

Technical Field

[0001] This utility model relates to the technical field of workshop dust removal devices, and in particular to a dust removal device for a cast steel shot heat treatment workshop. Background Technology

[0002] During the heat treatment of cast steel shot, the emission of high-temperature metal oxide dust (such as Fe2O3, Fe3O4, etc.) is one of the main sources of pollution. Traditional dust collection equipment (such as bag filters and cyclone dust collectors) is prone to problems such as filter bag burn-out, structural deformation, and incomplete dust removal under high-temperature environments, leading to decreased dust collection efficiency and increased maintenance costs. For example, ordinary filter bags have insufficient temperature resistance and are prone to embrittlement and breakage under long-term operating conditions above 200℃; rigid structures are prone to cracking due to uneven thermal expansion; uneven airflow distribution in the back-flushing system can cause a sharp increase in overall resistance after some filter bags become clogged.

[0003] Chinese patent discloses a dust removal device for workshops (publication number: CN 209049168 U), which includes a spray tower, a wastewater tank, a water inlet pipe, and a waste gas conveying pipe. The spray tower includes a spray chamber with an air inlet on its side. A reflux chamber is provided on the side wall of the spray chamber opposite to the air inlet. The reflux chamber includes a reflux port facing the spray mechanism. The air inlet is inclined upwards towards the reflux port opposite to the air inlet in the spray chamber. However, this type of dust removal device for workshops has poor high-temperature adaptability, unstable dust removal efficiency, and high maintenance costs. Therefore, a dust removal device for a cast steel shot heat treatment workshop is needed. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of poor high-temperature adaptability, unstable dust removal efficiency and high maintenance cost of existing dust removal devices in workshops, and to propose a dust removal device for cast steel shot heat treatment workshops.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A dust removal device for a cast steel shot heat treatment workshop, comprising a support frame, characterized in that: a high-temperature resistant chamber is installed on the support frame; a conical ash hopper is installed at the bottom of the high-temperature resistant chamber; an electric ash discharge valve is provided at the bottom of the conical ash hopper; cross-shaped reinforcing ribs are provided on the outer wall of the high-temperature resistant chamber; a membrane-coated fiberglass filter bag assembly is provided at the edge of the inner wall of the high-temperature resistant chamber; a high-pressure centrifugal fan is provided at the top of the high-temperature resistant chamber; a diversion duct is provided at one end of the high-pressure centrifugal fan; and a pulse backflushing system is provided on one side of the diversion duct. High-temperature adaptability: The chamber structure can withstand high-temperature environments and is suitable for high-temperature dust treatment in cast steel shot heat treatment workshops;

[0006] High-efficiency dust removal: The filter bag assembly works in conjunction with the ventilator to ensure efficient dust collection and reduce emissions pollution; Automatic dust removal: The pulse backflushing system automatically cleans the filter bags to prevent clogging and extend service life; Stable operation: Reinforcing ribs enhance the rigidity of the housing, prevent high-temperature deformation, and improve equipment durability; Convenient maintenance: The electric ash discharge valve facilitates ash discharge from the ash hopper, reducing the frequency of manual cleaning.

[0007] Preferably, the surface of the membrane-coated fiberglass filter bag is coated with a PTFE microporous membrane, which is heat-resistant up to 260℃. The membrane-coated fiberglass filter bag assembly is arranged in a diamond array with a bag spacing of ≥80mm, and each filter bag has a diameter of 130mm and a length of 6m. The PTFE coating makes the filter bag resistant to high temperatures and avoids high-temperature damage; the microporous membrane structure enhances dust interception capability and improves filtration accuracy; the diamond arrangement reduces airflow interference, avoids filter bags colliding with each other, and extends service life; the long filter bag design increases the filtration area and improves the overall dust removal efficiency.

[0008] Preferably, the high-pressure centrifugal fan includes a base, a volute on the base, an air inlet on the volute, an impeller inside the volute, a motor shaft connected to one end of the impeller, a drive motor connected to the other end of the motor shaft, and a regulating valve on the motor shaft. The regulating valve can adjust the airflow according to the working conditions to adapt to different dust concentration requirements; the optimized design of the volute and impeller improves airflow efficiency and reduces energy consumption; the direct connection between the motor shaft and the impeller reduces transmission loss and improves reliability. Preferably, the air duct includes a horizontal main collection pipe, with three tapered guide branches at the bottom of the main collection pipe, distributed along the axis of the main collection pipe. The multi-branch design ensures that the airflow enters the filter bag evenly, avoiding local blockage; the tapered guide structure reduces the flow velocity and prevents dust from accumulating in the pipe.

[0009] Preferably, the pulse backflushing system includes several pulse valve jet pipes, with 20-22 pulse valves arranged in an equally spaced array. Each pulse valve jet pipe is associated with a coated fiberglass filter bag. The one-to-one correspondence between the jet pipes and filter bags ensures thorough cleaning and prevents filter bag clogging; backflushing on demand reduces compressed air waste and lowers operating costs; uniform cleaning reduces filter bag wear and extends its service life.

[0010] Preferably, the high-temperature resistant enclosure adopts a double-layer heat-insulating steel plate structure, with an inner layer of 310S stainless steel and an outer layer of Q235 carbon steel, filled with 50mm thick aluminum silicate fiber felt in between. The double-layer structure plus the heat insulation layer effectively blocks heat and protects the internal components of the equipment; the stainless steel inner layer is corrosion-resistant, and the carbon steel outer layer provides mechanical strength, extending the equipment's lifespan; the heat insulation layer reduces heat loss, lowers the workshop ambient temperature, and improves working conditions.

[0011] The advantages of this utility model are:

[0012] This application systematically solves the problem of high-temperature dust treatment through a high-temperature resistant housing structure, a membrane filter bag array, intelligent pulse backflushing, and airflow optimization design. Specifically:

[0013] Stable operation at high temperatures: The double-layer heat-insulating box (310S stainless steel + aluminum silicate fiber) combined with external reinforcing ribs not only blocks heat transfer but also enhances mechanical strength and avoids thermal deformation; the PTFE membrane filter bag can withstand high temperatures of 260℃, ensuring long-term filtration reliability.

[0014] High-efficiency dust removal and self-cleaning: The diamond-shaped long filter bags (6m) expand the effective filtration area, and the pulse jet pipes with equal spacing achieve precise backflushing to avoid dust caking; the conical branch pipe design of the air duct balances the airflow and reduces dead corner accumulation.

[0015] Energy saving and low maintenance: The high-pressure centrifugal fan is equipped with a regulating valve to adjust the air volume as needed to reduce energy consumption; the electric ash discharge valve realizes automated ash discharge and reduces manual intervention.

[0016] Long lifespan and safety: Cross-reinforcing ribs and double-layer steel plate structure resist thermal stress impact, anti-collision layout of filter bags extends service life, and the overall design takes into account both efficiency and durability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This utility model Figure 1 Enlarged view of I in the middle.

[0020] Figure 3 This is a schematic diagram of the main structure of this utility model.

[0021] Figure 4 This utility model Figure 3 Enlarged view of section II.

[0022] In the diagram: 1. Horizontal main collection pipe; 2. Conical guide branch pipe; 3. High-temperature resistant housing; 4. Cross-shaped reinforcing ribs; 5. Support frame; 6. Membrane-coated fiberglass filter bag; 7. Conical ash hopper; 8. Electric ash discharge valve; 9. Air inlet; 10. Impeller; 11. Volute; 12. Regulating valve; 13. Drive motor; 15. Base; 16. Pulse valve jet pipe. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Example

[0024] Please see Figure 1-4 As shown, a dust removal device for a cast steel shot heat treatment workshop includes a support frame 5. The device is characterized by: a high-temperature resistant housing 3 mounted on the support frame 5; a conical ash hopper 7 installed at the bottom of the high-temperature resistant housing 3; an electric ash discharge valve 8 at the bottom of the conical ash hopper 7; cross-shaped reinforcing ribs 4 on the outer wall of the high-temperature resistant housing 3; a set of membrane-coated fiberglass filter bags 6 on the inner edge of the high-temperature resistant housing 3; a high-pressure centrifugal fan at the top of the high-temperature resistant housing 3; a duct at one end of the high-pressure centrifugal fan; and a pulse backflushing system on one side of the duct. High-temperature adaptability: The housing structure can withstand high-temperature environments and is suitable for high-temperature dust treatment in cast steel shot heat treatment workshops; High-efficiency dust removal: The filter bag set works in conjunction with the fan to ensure efficient dust collection and reduce emissions; Automatic cleaning: The pulse backflushing system automatically cleans the filter bags, preventing clogging and extending service life; Stable operation: The reinforcing ribs enhance the rigidity of the housing, preventing high-temperature deformation and improving equipment durability; Convenient maintenance: The electric ash discharge valve 8 facilitates ash discharge from the ash hopper, reducing the frequency of manual cleaning.

[0025] In this embodiment, the surface of the membrane-coated fiberglass filter bag 6 is coated with a PTFE microporous membrane, which is heat-resistant up to 260℃. The membrane-coated fiberglass filter bags 6 are arranged in a diamond array with a bag spacing of ≥80mm. Each filter bag has a diameter of 130mm and a length of 6m. The PTFE coating makes the filter bags resistant to high temperatures, preventing high-temperature damage; the microporous membrane structure enhances dust interception ability and improves filtration accuracy; the diamond arrangement reduces airflow interference, avoids filter bags colliding with each other, and extends service life; the long filter bag design increases the filtration area and improves the overall dust removal efficiency.

[0026] In this embodiment, the high-pressure centrifugal fan includes a base 15, on which a volute 11 is mounted. The volute 11 has an air inlet 9, and an impeller 10 is located inside. One end of the impeller 10 is connected to a motor shaft, and the other end of the motor shaft is connected to a drive motor 13. A regulating valve 12 is mounted on the motor shaft. The regulating valve 12 can adjust the airflow according to operating conditions to adapt to different dust concentration requirements. The optimized design of the volute 11 and impeller 10 improves airflow efficiency and reduces energy consumption. The direct connection between the motor shaft and the impeller 10 reduces transmission losses and improves reliability. In this embodiment, the air duct includes a horizontal main collection pipe 1. The bottom of the horizontal main collection pipe 1 has three tapered guide branch pipes 2 distributed along the axis of the horizontal main collection pipe 1. The multi-branch design ensures uniform airflow into the filter bag, avoiding localized blockages. The tapered guide structure reduces flow velocity and prevents dust accumulation inside the pipe.

[0027] In this embodiment, the pulse backflushing system includes several pulse valve jet pipes 16. The number of pulse valves is 20-22, arranged in an equally spaced array. Each pulse valve jet pipe 16 is associated with a coated fiberglass filter bag 6. The one-to-one correspondence between the jet pipes and filter bags ensures thorough cleaning and prevents filter bag clogging; backflushing on demand reduces compressed air waste and lowers operating costs; uniform cleaning reduces filter bag wear and extends its service life.

[0028] In this embodiment, the high-temperature resistant enclosure 3 adopts a double-layer heat-insulating steel plate structure, with an inner layer of 310S stainless steel and an outer layer of Q235 carbon steel, filled with 50mm thick aluminum silicate fiber felt in between. The double-layer structure plus the heat insulation layer effectively blocks heat and protects the internal components of the equipment; the stainless steel inner layer is corrosion-resistant, and the carbon steel outer layer provides mechanical strength, extending the equipment's lifespan; the heat insulation layer reduces heat loss, lowers the workshop ambient temperature, and improves working conditions.

[0029] The implementation principle of this embodiment is as follows:

[0030] Step 1: Vacuuming

[0031] When high-temperature dust (such as metal particles generated by the oxidation of steel shot) is generated in the heat treatment workshop, the high-pressure centrifugal fan starts to work, drawing in the dust-laden gas through the duct. The duct consists of a horizontal main collection pipe 1 and three tapered guide pipes 2 at the bottom, which can evenly disperse the airflow and prevent dust from clogging the pipe.

[0032] Step 2: Filtering

[0033] When dust-laden gas enters the high-temperature resistant chamber 3, it first encounters the membrane-coated fiberglass filter bags 6 on the inner wall edge. The filter bags are coated with PTFE microporous membranes, which can withstand high temperatures of 260℃ and are arranged in a diamond array with a spacing of at least 80mm to avoid them crowding together and affecting the filtration effect. The dust is blocked by the filter bags, and the clean air continues to rise and is discharged from the top of the chamber.

[0034] Step 3: Ash Removal

[0035] When dust accumulates on the filter bags and ventilation resistance increases, the pulse backflushing system automatically starts. This system contains 20-22 pulse valve jet pipes 16, each pipe spraying high-pressure air at a filter bag to shake off the dust. The falling dust falls into the conical ash hopper 7 at the bottom of the chamber. When the dust in the ash hopper reaches a certain amount, the electric ash discharge valve 8 at the bottom opens to discharge the ash, preventing accumulation from affecting the dust removal effect. Throughout the process, the regulating valve 12 of the high-pressure centrifugal fan can automatically adjust the airflow according to the amount of dust. The entire dust removal process is carried out in a high-temperature environment, but the high-temperature resistant chamber 3 is made of double-layer steel plates with a 50mm thick aluminum silicate fiber felt sandwiched in between, which can ensure stable operation for a long time.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A dust removal device for a cast steel shot heat treatment workshop, comprising a support frame (5), characterized in that... The bracket (5) is equipped with a high-temperature resistant box (3), a conical ash hopper (7) is installed at the bottom of the high-temperature resistant box (3), an electric ash discharge valve (8) is provided at the bottom of the conical ash hopper (7), a cross-shaped reinforcing rib (4) is provided on the outer wall of the high-temperature resistant box (3), a group of membrane-coated fiberglass filter bags (6) is provided on the inner edge of the high-temperature resistant box (3), a high-pressure centrifugal fan is provided on the top of the high-temperature resistant box (3), a duct is provided at one end of the high-pressure centrifugal fan, and a pulse backflushing system is provided on one side of the duct.

2. The dust removal device for a cast steel shot heat treatment workshop according to claim 1, characterized in that: The surface of the membrane-coated fiberglass filter bag (6) is coated with a PTFE microporous membrane, which is resistant to 260℃. The membrane-coated fiberglass filter bag (6) group is arranged in a diamond array with a bag spacing of ≥80mm. The diameter of a single filter bag is 130mm and the length is 6m.

3. The dust removal device for a cast steel shot heat treatment workshop according to claim 1, characterized in that: The high-pressure centrifugal fan includes a base (15), a volute (11) on the base (15), an air inlet (9) on the volute (11), an impeller (10) inside the volute (11), a motor shaft connected to one end of the impeller (10), a drive motor (13) connected to one end of the motor shaft, and a regulating valve (12) on the motor shaft.

4. The dust removal device for a cast steel shot heat treatment workshop according to claim 1, characterized in that: The air duct includes a horizontal main flow collector (1), and a tapered branch flow collector (2) is provided at the bottom of the horizontal main flow collector (1). There are 3 tapered branch flow collectors (2) and they are distributed along the axis of the horizontal main flow collector (1).

5. A dust removal device for a cast steel shot heat treatment workshop according to claim 2, characterized in that: The pulse backflushing system includes several pulse valve jet pipes (16), the number of pulse valves is 20 to 22 and they are arranged in an equally spaced array, and the pulse valve jet pipes (16) are associated with the membrane fiberglass filter bag (6).

6. A dust removal device for a cast steel shot heat treatment workshop according to claim 1, characterized in that: The high-temperature resistant box (3) adopts a double-layer heat-insulating steel plate structure, with the inner layer being 310S stainless steel and the outer layer being Q235 carbon steel, and the middle being filled with 50mm thick aluminum silicate fiber felt.

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