Efficient flue gas collecting cover for ground pouring and sand mold cooling
By combining a portal telescopic hood and a suspended hood, the problem of flue gas capture during ground pouring and sand mold cooling is solved, achieving efficient and low-energy flue gas treatment, reducing equipment costs and environmental pollution.
Patent Information
- Application Number
- CN202520170258.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-25
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-25
AI Technical Summary
In the existing ground casting and sand mold cooling processes, fixed flue gas capture hoods affect production, telescopic hoods are prone to derailment, equipment investment and operating energy consumption are high, and flue gas diffusion poses serious environmental and health hazards.
It adopts a portal-type telescopic hood structure, combined with a suspended hood and a circulating air mode. Through the alternating arrangement of rigid and flexible segments, an air curtain is formed to capture the flue gas, which is then treated by a dust removal and purification device, reducing ventilation volume and energy consumption.
It improves flue gas capture efficiency, reduces initial investment and operating costs, reduces the harm of flue gas diffusion to the environment and health, and achieves low-carbon operation.
Smart Images
Figure CN223833075U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dust-laden gas collection technology, and in particular to a high-efficiency flue gas collection hood for ground pouring and sand mold cooling. Background Technology
[0002] Ground casting is one of the main casting processes. The waste gases generated during the casting and cooling processes need to be captured and purified to ensure the workshop environment meets occupational health standards and to prevent outdoor atmospheric pollution. Because the sand mold arrangement area in ground casting is often large, and the sand mold arrangement and cooling areas change in real time according to production schedules, the location of the pollution source is dynamic, not fixed. Secondly, if the capture hood is a fixed structure, its coverage area is too large, affecting normal production; if the capture hood is a telescopic structure, the long extension distance makes it prone to derailment, affecting its use. Thirdly, the casting process requires overhead cranes to lift the ladle, and the sand mold transportation also requires lifting operations; therefore, the space above the casting area needs to be reserved for process operations, making fixed enclosed hoods unsuitable for fume capture. Finally, existing waste gas capture equipment requires a large ventilation volume, resulting in high initial investment and high system energy consumption, which is detrimental to the development of the casting industry. Summary of the Invention
[0003] To address the aforementioned problems, this utility model provides a high-efficiency flue gas capture hood for ground casting and sand mold cooling, specifically employing the following technical solution:
[0004] The high-efficiency flue gas capture hood for ground casting and sand mold cooling, as described in this utility model, includes a portal-shaped telescopic hood installed on the ground. The portal-shaped telescopic hood has a circulating exhaust port and a dust removal and purification exhaust port in its middle section, and a roller shutter door and a circulating air supply pipe at its ends. There are two circulating exhaust ports, and the circulating air supply pipe has multiple circulating air supply ports for supplying air into the portal-shaped telescopic hood. Each circulating exhaust port is connected to a circulating air supply pipe via a telescopic pipe. A suspension hood for capturing casting flue gas is also installed at the ends of the portal-shaped telescopic hood. The suspension hood consists of a casting air supply pipe and a casting return air pipe connected to an exhaust fan. The casting air supply pipe has multiple casting air supply ports for supplying air into the portal-shaped telescopic hood, and the casting return air pipe has a downward-opening casting return air port. The dust removal and purification exhaust port is connected to a dust removal and purification device via a sliding sealing pipe mechanism.
[0005] The portal-shaped telescopic cover is composed of a rigid exhaust section, a rigid end section, and a telescopic section. The rigid exhaust section is located in the middle, the rigid end section is located on both sides of the rigid exhaust section, and the telescopic section is used to connect the rigid exhaust section and the rigid end section.
[0006] The bottom of the rigid exhaust section, rigid end section, and telescopic section are all equipped with wheels. The circulating exhaust port and dust removal and purification exhaust port are located on the top of the rigid exhaust section, and the circulating air supply pipe is located on the top of the rigid end section.
[0007] Each of the telescopic pipes is equipped with a circulating fan. The two telescopic pipes are parallel to each other and are both arranged along the longitudinal direction of the portal-shaped telescopic cover. The line connecting the circulating air supply pipe, the circulating air outlet, and the dust removal and purification air outlet is perpendicular to the telescopic pipe.
[0008] The top two ends of the portal-shaped telescopic cover are equipped with linear guide rails. The linear guide rails, the pouring air supply pipe, and the pouring return air pipe are all parallel to the circulating air supply pipe. The pouring return air pipe is located on the side closer to the portal-shaped telescopic cover, and the pouring air supply pipe is located on the side farther away from the portal-shaped telescopic cover. The pouring return air pipe is slidably connected to the linear guide rails.
[0009] The air supply direction of the circulating air supply outlet and the casting air supply outlet is at an angle of 30-50° to the horizontal plane.
[0010] This utility model provides a high-efficiency flue gas capture hood for ground casting and sand mold cooling. By setting a suspended hood at the end of the telescopic hood, the casting flue gas can be quickly captured and purified within the telescopic hood, solving the drawbacks of traditional fixed closed hoods that affect casting operations. The telescopic hood adopts an alternating arrangement of rigid and flexible telescopic segments, which can avoid the phenomenon of derailment due to excessive telescopic distance. It can cover a large area, improve the flue gas capture effect during sand box cooling, and prevent damage to the occupational health environment in the workshop. Since the telescopic hood not only exhausts air to the dust removal and purification device, but also adopts an internal circulating air mode, the air curtain formed by the circulating air effectively increases the wind speed in the cross-section of the hood, thereby improving the flue gas capture effect, reducing the air volume handled by the dust collector, and achieving the effects of high-efficiency capture, low-carbon operation, and reduced initial investment and operating costs.
[0011] This invention features a simple structure, ease of use, high degree of automation, and low energy consumption. It effectively reduces the diffusion of dust-laden fumes generated during pouring and sand box cooling within the foundry workshop, preventing health hazards to personnel entering the hood for maintenance due to low cross-sectional wind speed, and mitigating environmental damage caused by fumes escaping into the workshop during hood contraction. Statistics show that this invention can reduce ventilation by approximately 50% during pouring and approximately 80% during cooling, not only reducing system energy consumption but also lowering initial investment and maintenance costs, demonstrating significant green and low-carbon performance. Attached Figure Description
[0012] Figure 1 This is a three-dimensional diagram of the casting process of this utility model.
[0013] Figure 2This is a three-dimensional diagram of the contraction condition of this utility model.
[0014] Figure 3 yes Figure 1 Elevation view.
[0015] Figure 4 yes Figure 2 Top view.
[0016] Figure 5 yes Figure 3 AA section view.
[0017] Figure 6 yes Figure 4 BB cross-section diagram.
[0018] Figure 7 This is a diagram showing the airflow organization during the pouring operation of this utility model. Detailed Implementation
[0019] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific working processes. However, the protection scope of this utility model is not limited to the following embodiments.
[0020] like Figure 1-7 As shown, the high-efficiency flue gas capture hood for ground casting and sand mold cooling of this utility model includes a portal telescopic hood 1 and a suspended hood 2 connected thereto.
[0021] Specifically, the portal-shaped telescopic cover 1 is mounted on a ground slide rail and consists of a rigid exhaust section 11, two rigid end sections 12, and two telescopic sections 13. The rigid exhaust section 11 is located in the middle, the rigid end sections 12 are located on either side of the rigid exhaust section 11, and the telescopic sections 13 connect the rigid exhaust section 11 and the rigid end sections 12. The rigid exhaust section 11 and the two rigid end sections 12 are made of metal, and the telescopic sections 13 consist of a metal telescopic frame and a fireproof cover. For easy movement, the bottom of the rigid exhaust section 11, the rigid end sections 12, and the telescopic sections 13 are all equipped with wheels adapted to the ground slide rail. Typically, the drive mechanism for the wheels is mounted on one of the rigid end sections 12.
[0022] The top of the rigid exhaust section 11 is equipped with three exhaust vents: one for dust removal and purification (3), and two for recirculation (4), arranged sequentially along the horizontal direction of the hood. Each rigid end section 12 has a horizontal recirculation duct 5 at its top, and each recirculation duct 5 is connected to a recirculation exhaust vent 4 via a telescopic pipe 6. Typically, the two telescopic pipes 6 are parallel to each other and run along the longitudinal direction of the portal-shaped telescopic hood 1; the center line connecting the recirculation duct 5, the recirculation exhaust vent 4, and the dust removal and purification exhaust vent 3 is perpendicular to the telescopic pipe 6. Each telescopic pipe 6 is equipped with a recirculation fan 7, and each recirculation duct 5 has multiple recirculation vents that supply air into the portal-shaped telescopic hood 1. When the circulating fan 7 is turned on, the airflow from the circulating air supply duct 5 at both ends of the hood is downward and at a certain angle, blowing the flue gas rising inside the hood due to buoyancy to the exhaust port at the top of the rigid exhaust section 11 (i.e., forming an air curtain that increases the cross-sectional wind speed inside the hood). Generally, the angle between the air supply direction of the circulating air supply port on the circulating air supply duct 5 and the horizontal plane is 30-50°, and the outlet wind speed of the circulating air supply port is 6-12 m / s. In addition, a receiving box for accommodating the roller shutter door is also installed on the top of the rigid end section 12.
[0023] The aforementioned dust removal and purification exhaust port 3 is connected to the dust removal and purification device via a sliding sealing pipe mechanism. It is used to discharge the flue gas inside the portal telescopic hood 1 to the dust removal and purification device and to perform venting treatment after the exhaust gas meets the standards. The sliding sealing pipe mechanism adopts the dust removal method structure of the single-track telescopic hood (CN2022106753521). It includes a longitudinal exhaust pipe 31 installed at the inlet end of the dust removal and purification unit. The top surface of the longitudinal exhaust pipe 31 has a longitudinal through groove, and a sealing belt that is adsorbed by negative pressure is installed on the longitudinal through groove. It also includes a movable duct connector 32 installed at the dust removal and purification exhaust port 3. The movable duct connector 32 includes a pipe connector connected to the outlet pipe of the dust removal and purification exhaust port 3, and a sealing cover installed outside the pipe connector. The pipe connector is located between the sealing belt and the longitudinal exhaust pipe 31, and the lower opening of the pipe connector corresponds to the longitudinal through groove. The sealing cover is located outside the sealing belt, and the lower opening of the sealing cover is sealed to the sealing belt. Since the lower opening of the pipe joint is always connected to the longitudinal exhaust pipe 31, and the sealing belt on its outer side can keep the longitudinal through groove of the longitudinal exhaust pipe 31 sealed when subjected to negative pressure adsorption, the dust removal and purification exhaust port 3 can still be smoothly discharged after the position is moved by the sliding sealing pipe mechanism.
[0024] The suspended hood 2 is located at both ends of the top of the portal-type telescopic hood 1 and is used to capture the casting fumes. The suspended hood 2 is composed of a casting air supply pipe 22 and a casting return air pipe 23 connected to an exhaust fan 21, and is U-shaped in overall form. Specifically, horizontal linear guide rails 8 are respectively provided at both ends of the top of the portal-type telescopic hood 1. The linear guide rails 8, the casting air supply pipe 22, and the casting return air pipe 23 are all parallel to the circulating air supply pipe 5. The casting return air pipe 12 is located on the side closer to the portal-type telescopic hood 1, and the casting air supply pipe 22 is located on the side farther away from the portal-type telescopic hood 1. The casting return air pipe 23 is slidably connected to the linear guide rails 8, so that the suspended hood 2 can move according to the specific sand box casting position in order to quickly and efficiently capture the casting fumes. The casting air supply pipe 22 is provided with multiple casting air supply ports that supply air into the portal-type telescopic hood 1, and the casting return air pipe 23 is provided with a casting return air port that opens downwards. Typically, the angle between the air supply direction of the pouring air outlet and the horizontal plane is 30-50°. In use, the suspension hood 2 is adjusted above the pouring sand box, the pouring ladle hoisting rope is located between the pouring air supply pipe 22 and the pouring return air pipe 23, the exhaust fan 21 is started, and the pouring operation is carried out. A large amount of high-temperature fumes rise and are captured by the pouring return air outlet. The exhaust fan 21 draws the pouring fumes from the pouring return air pipe 23 and sends them out from the pouring air supply pipe 22, forming an air jet that entrains the pouring fumes and enters the portal telescopic hood 1. It is captured by the high-speed air curtain inside the portal telescopic hood 1 and enters the exhaust port at the top of the rigid exhaust section 11 along with the circulating airflow.
[0025] In actual production, this utility model can be applied as follows, depending on the specific working conditions:
[0026] 1) Pouring operation: Move the portal telescopic cover 1 to the vicinity of the sand box to be poured, and use a crane to lift the ladle to the upper part of the sand box. Move the suspension cover 2 on this side along the linear guide rail 8 to the top of the ladle, and position the ladle lifting rope in the middle of the suspension cover 2. At the same time, lower the roller shutter door on the other side of the portal telescopic cover 1 to close the opening at that end. After turning on the exhaust fan 21 of the suspension cover 2 and the circulating fan 7 of the portal telescopic cover 1, the sand box is poured. The air jet formed by the pouring air supply port of the suspension cover 2 sends the flue gas generated by the pouring and molten iron ladle into the portal telescopic cover 1, and it is captured by the high-speed air curtain formed by the circulating air supply ports at both ends of the portal telescopic cover 1. The flue gas inside the cover gathers in the middle and rises. Part of it returns to the portal telescopic cover 1 through the circulating exhaust port 4 and the circulating air supply pipe 5, and the other part enters the dust removal and purification device through the dust removal and purification exhaust port 3. After the dust removal and purification meets the standards, it is discharged.
[0027] 2) Cooling mode: When cooling the sand box, lower the roller shutters at both ends to form a closed space with the telescopic hood 1. Turn on the circulating fan 7 to form a high-speed air curtain with the air supply air from the circulating air supply pipes 5 at both ends. The exhaust gas released from the sand box is captured by the high-speed air curtain and gathers in the middle and rises. Part of it returns to the telescopic hood 1 through the circulating exhaust port 4 and the circulating air supply pipe 5, and the other part enters the dust removal and purification device through the dust removal and purification exhaust port 3. After the dust removal and purification meets the standards, it is discharged.
[0028] 3) Non-operational conditions: When there is no pouring or cooling in the pouring area, the portal telescopic cover 1 retracts together under the action of the walking wheel drive device, providing more operating space for process operations.
[0029] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
Claims
1. A high-efficiency flue gas capture hood for ground casting and sand mold cooling, characterized in that: The system includes a telescopic gate-shaped enclosure installed on the ground. The central part of the gate-shaped telescopic enclosure has a circulating exhaust port and a dust removal and purification exhaust port. The ends of the gate-shaped telescopic enclosure have a roller shutter door and a circulating air supply duct. There are two circulating exhaust ports, and the circulating air supply duct has multiple circulating air supply ports that supply air into the gate-shaped telescopic enclosure. Each circulating exhaust port is connected to a circulating air supply duct via a telescopic pipe. The ends of the gate-shaped telescopic enclosure also have a suspended hood for capturing casting fumes. The suspended hood consists of a casting air supply duct and a casting return duct connected to an exhaust fan. The casting air supply duct has multiple casting air supply ports that supply air into the gate-shaped telescopic enclosure, and the casting return duct has a downward-opening casting return port. The dust removal and purification exhaust port is connected to a dust removal and purification device via a sliding sealing pipe mechanism.
2. The high-efficiency flue gas capture hood for ground casting and sand mold cooling according to claim 1, characterized in that: The portal-shaped telescopic cover is composed of a rigid exhaust section, a rigid end section, and a telescopic section. The rigid exhaust section is located in the middle, the rigid end section is located on both sides of the rigid exhaust section, and the telescopic section is used to connect the rigid exhaust section and the rigid end section.
3. The high-efficiency flue gas capture hood for ground casting and sand mold cooling according to claim 2, characterized in that: The bottom of the rigid exhaust section, rigid end section, and telescopic section are all equipped with wheels. The circulating exhaust port and dust removal and purification exhaust port are located on the top of the rigid exhaust section, and the circulating air supply pipe is located on the top of the rigid end section.
4. The high-efficiency flue gas capture hood for ground casting and sand mold cooling according to claim 1, characterized in that: Each of the telescopic pipes is equipped with a circulating fan. The two telescopic pipes are parallel to each other and are both arranged along the longitudinal direction of the portal-shaped telescopic cover. The line connecting the circulating air supply pipe, the circulating air outlet, and the dust removal and purification air outlet is perpendicular to the telescopic pipe.
5. The high-efficiency flue gas capture hood for ground casting and sand mold cooling according to claim 1, characterized in that: The top two ends of the portal-shaped telescopic cover are equipped with linear guide rails. The linear guide rails, the pouring air supply pipe, and the pouring return air pipe are all parallel to the circulating air supply pipe. The pouring return air pipe is located on the side closer to the portal-shaped telescopic cover, and the pouring air supply pipe is located on the side farther away from the portal-shaped telescopic cover. The pouring return air pipe is slidably connected to the linear guide rails.
6. The high-efficiency flue gas capture hood for ground casting and sand mold cooling according to claim 1, characterized in that: The air supply direction of the circulating air supply outlet and the casting air supply outlet is at an angle of 30-50° to the horizontal plane.