Overhanging cutting of a runner fume trap method

Abstract

The application discloses a kind of cantilever cutting pouring head smoke capturing method, is realized by smoke capturing device, when carrying out smoke capturing, first open dust removal mechanism, make system pipeline be in negative pressure suction state, then according to the specific station of small and medium-sized casting cutting pouring head, rotation drive mechanism, translation drive mechanism and lifting drive mechanism are started in turn, the position of suction cantilever pipe, the position of air pipe connector and the height of capture cover are adjusted respectively, when capture cover reaches target position, due to the negative pressure suction effect, the smoke generated by cutting pouring head enters capture cover, corrugated expansion pipe, air pipe connector, suction cantilever pipe and dust removal mechanism in turn, after dust removal treatment, smoke is discharged in line with standard.The initial investment of the present application is lower, the operation energy consumption is lower, under the condition that the trapping efficiency is same, the ventilation volume is reduced by 40%-50%, the system operation energy consumption is reduced by 30%-45%, and the green low-carbon effect is good.

Description

Technical Field

[0001] This invention relates to the field of casting production technology, and in particular to a method for collecting flue gas from a cantilevered cutting gating and riser system. Background Technology

[0002] In casting production, cutting risers and gating gates is a critical process, currently often achieved by softening and melting off excess risers and gating gates using gas flames. This flame cutting process generates a large amount of fumes, which, if not captured and purified in a timely manner, will pollute the workshop and atmospheric environment, posing a threat to the health of workers. Therefore, fumes capture during riser and gating gate cutting is a crucial step in achieving clean production in the casting industry. Typically, riser and gating gate cutting is an intermittent operation with no fixed workstation. For small and medium-sized castings, the fume capture and purification device provided by ZL202210299185.5 suffers from drawbacks such as its large size, inconvenient mobility, and lack of targeted fume capture. Due to the cross ventilation in the workshop, the fumes from the cutting of the gating and riser of small and medium-sized castings have a large diffusion range. According to the principle of full coverage of the plume, the diameter of the exhaust hood needs to be at least 1 to 1.5 meters. In addition, in order to achieve a good capture effect, the exhaust hood opening also needs to maintain a certain wind speed, which increases the system ventilation volume, resulting in higher initial investment and operating energy consumption, which does not meet the requirements of green and low-carbon development. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a cantilevered cutting riser flue gas collection method, specifically employing the following technical solution:

[0004] The cantilevered cutting riser flue gas collection method of the present invention is implemented by a flue gas collection device, wherein...

[0005] The flue gas collection device includes a collection hood, a flue gas negative pressure transmission mechanism, and a dust removal mechanism. The head of the collection hood has a porous structure, and the tail of the collection hood is provided with a corrugated telescopic tube. The flue gas negative pressure transmission mechanism includes a rotary drive mechanism, which is connected to an exhaust cantilever pipe located above the cutting riser area. The exhaust cantilever pipe is provided with a duct connector connected to a translation drive mechanism. The duct connector has a first lower opening and a second lower opening. The first lower opening is opposite to the longitudinal ventilation port at the top of the exhaust cantilever pipe and is connected through a negative pressure sealing connection mechanism. The second lower opening is located on the outside of the exhaust cantilever pipe and is connected to the corrugated telescopic tube. The duct connector is also provided with a lifting drive mechanism, which is connected to the collection hood and is used to extend or retract the corrugated telescopic tube. A flexible hose connected to the dust removal mechanism is provided at one end of the exhaust cantilever pipe near the edge of the cutting riser area.

[0006] The flue gas capture method includes: first, activating the dust removal mechanism to put the system pipeline into a negative pressure suction state; then, according to the specific work position of the cutting riser and gating point of the small and medium-sized castings, sequentially activating the rotary drive mechanism, the translation drive mechanism, and the lifting drive mechanism to adjust the position of the exhaust cantilever pipe, the position of the duct connector, and the height of the capture hood, respectively. When the capture hood reaches the target position, due to the negative pressure suction, the flue gas generated from cutting the riser and gating point enters the capture hood, the corrugated expansion pipe, the duct connector, the exhaust cantilever pipe, and the dust removal mechanism in sequence. After dust removal treatment, the flue gas is discharged in compliance with standards.

[0007] The trapping hood has a conical structure, and the head of the trapping hood is provided with a perforated hood plate. The outer edge of the hood plate is provided with round or elliptical holes arranged in a double ring shape, and the porosity of the hood plate is 0.2 to 0.4.

[0008] The rotary drive mechanism is located outside the cutting riser area and includes a rotary motor. The output shaft of the rotary motor is connected to a vertically arranged rotary shaft through a belt drive mechanism. The rotary shaft is fixedly connected to the end of the exhaust cantilever pipe.

[0009] The rotation radius of the exhaust cantilever pipe is equal to the width of the cutting riser area, and the end of the exhaust cantilever pipe away from the rotation drive mechanism is provided with a diagonal steel wire rope connected to the factory column.

[0010] The duct connector includes an L-shaped sealed cavity structure with a first lower opening and a second lower opening, wherein the first lower opening is located on the higher bottom surface and the second lower opening is located on the lower bottom surface.

[0011] The translation drive mechanism includes a support frame, which is located on the side of the duct connector away from the second lower opening. The top of the support frame is connected to the duct connector, and a horizontal support is provided at the bottom of the support frame. A translation motor is provided on the horizontal support, and the output shaft of the translation motor is connected to the drive wheel. The top surface of the drive wheel is connected to the bottom surface of the exhaust cantilever pipe.

[0012] The translation drive mechanism also includes a driven wheel mounted on the duct connector. The top surface of the driven wheel is in contact with the bottom surface of the exhaust cantilever pipe and is correspondingly mounted to the drive wheel.

[0013] The negative pressure sealing connection mechanism includes a sealing belt disposed at the top of the exhaust cantilever pipe for sealing the longitudinal vent, and a support roller shaft disposed inside the duct connector. The support roller shaft is perpendicular to the exhaust cantilever pipe and disposed at the four corners above the first lower opening. It includes a pair of lower outer roller shafts and a pair of upper inner roller shafts. The outer roller shafts are disposed between the sealing belt and the inner wall of the duct connector, and the inner roller shafts are disposed inside the sealing belt.

[0014] The lifting drive mechanism includes a support platform located below the exhaust cantilever pipe and connected to the duct connector. A lifting motor is installed on the support platform, and a winding shaft is installed at the output end of the lifting motor. The winding shaft is arranged parallel to the exhaust cantilever pipe, and a lifting rope connected to the collection hood is installed at each end of the winding shaft.

[0015] The dust removal mechanism is located outside the cutting and pouring area, and includes a dust collector connected to the hose. An exhaust fan is provided at the outlet end of the dust collector.

[0016] The cantilevered cutting riser and gating fumes collection method provided by this invention is achieved through a cleverly designed, flexible, wide-coverage, and highly automated fumes collection device. The collection hood can move horizontally along the exhaust cantilever pipe according to the specific work position of the small and medium-sized casting riser and gating vent, and rotate with the exhaust cantilever pipe to reach the target position. The vertical height is then controlled by a lifting drive mechanism for targeted fumes collection. Because the rotation drive mechanism of the exhaust cantilever pipe is located on one side of the workshop and is lower than the overhead crane, the collection hood can move freely in the risingr and gating vent area without affecting the crane's movement. This method is ideal for work positions that are not fixed and for intermittent operations. For small and medium-sized parts cutting and pouring riser operations, the capture hood is connected to the exhaust cantilever pipe via a corrugated expansion tube and a duct connector with a negative pressure sealing connection mechanism. The corners are all rigid connection structures that are not easily deformed. Therefore, even if the corrugated expansion tube expands or contracts, it will not cause a significant change in the duct resistance, and the system ventilation volume remains basically constant. The capture hood is equipped with a perforated hood plate with a porosity of 0.2 to 0.4, arranged in a double ring along the outer edge. This can maintain a high capture efficiency at a low ventilation volume, reducing the pollution of the workshop environment and atmospheric environment caused by the escape of flue gas from the cutting and pouring riser, as well as the harm to the health of employees.

[0017] Compared with existing flue gas capture devices, the flue gas capture device of the present invention has a lower initial investment, lower operating energy consumption, and higher capture efficiency. Through engineering application and calculation, under the same capture efficiency, the ventilation volume of the device of the present invention can be reduced by 40% to 50%, and the system operating energy consumption can be reduced by 30% to 45%, which has a better green and low-carbon effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the flue gas collection device described in this invention.

[0019] Figure 2 yes Figure 1 Top view.

[0020] Figure 3 This is a schematic diagram of the duct connector in this invention.

[0021] Figure 4This is a schematic diagram of the connection structure between the duct connector and the exhaust cantilever pipe in this invention.

[0022] Figure 5 yes Figure 4 AA cross-section view.

[0023] Figure 6 yes Figure 5 BB cross-section.

[0024] Figure 7 This is a schematic diagram of the structure of the hood plate of the trapping hood in this invention. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0026] The cantilevered cutting riser flue gas collection method of the present invention is implemented by a flue gas collection device. Depending on the size of the cutting riser area, one or more flue gas collection devices are provided, each consisting of a collection hood, a flue gas negative pressure transmission mechanism, and a dust removal mechanism.

[0027] like Figure 1-7 As shown, the head of the trap hood 1 has a porous structure and is equipped with a flame arrester, while the tail of the trap hood is equipped with a corrugated telescopic tube 2. Specifically, the trap hood 1 has a conical structure, and the head of the trap hood 1 is equipped with a trap opening plate 11 with a porous structure. The outer edge of the trap opening plate 11 is provided with round or elliptical holes arranged in a double ring shape, and the porosity of the trap opening plate is 0.2 to 0.4.

[0028] The method for calculating the ventilation volume of the above-mentioned wind trap hood 1 when collecting smoke is as follows: (1)

[0029] (1)

[0030] Where: L—ventilation volume, m³ / h;

[0031] —Opening velocity, m / s;

[0032] S—Opening area, square meters.

[0033] It can be seen that the collection efficiency of the exhaust hood is closely related to the wind speed at the opening. When the opening wind speed is the same, by adopting the hood plate 11 form described in this invention and maintaining the above-mentioned opening ratio, a high flue gas collection efficiency can be maintained at a lower ventilation volume, thereby reducing the pollution of the workshop environment and atmospheric environment caused by flue gas escaping from the cutting and casting riser, as well as the harm to the health of employees.

[0034] The flue gas negative pressure transmission mechanism includes a rotary drive mechanism 3, which is connected to an exhaust cantilever pipe 4 located above the cutting riser area. The exhaust cantilever pipe 4 is provided with a duct connector 6 connected to a translation drive mechanism 5. The duct connector 6 has a first lower opening 61 and a second lower opening 62. The first lower opening 61 is opposite to the longitudinal ventilation port 41 at the top of the exhaust cantilever pipe 4 and is connected to the negative pressure sealing connection mechanism 7. The second lower opening 62 is located on the outside of the exhaust cantilever pipe 4 and is connected to the corrugated telescopic pipe 2. The duct connector 6 is also provided with a lifting drive mechanism 8, which is connected to the collection hood 1 and is used to extend or retract the corrugated telescopic pipe 2. A flexible hose 10 connected to a dust removal mechanism 9 is provided at one end of the exhaust cantilever pipe 4 near the edge of the cutting riser area.

[0035] The aforementioned rotary drive mechanism 3 is located outside the cutting riser and gating area and includes a rotary motor. The output shaft of the rotary motor is connected to a vertically arranged rotary shaft 31 via a belt drive mechanism. The rotary shaft 31 is fixedly connected to the end of the exhaust cantilever pipe 4. When the rotary motor starts, the exhaust cantilever pipe 4 can rotate around the rotary shaft 31. The length of the exhaust cantilever pipe 4 can be determined according to the overall design scheme, using one or more pipes, arranged on the same side, opposite side, or adjacent side of the cutting riser and gating area, with the standard being to cover the entire cutting riser and gating area. In this embodiment, multiple exhaust cantilever pipes 4 are arranged at intervals on the same side of the cutting riser and gating area, and the rotation radius (i.e., length) of each exhaust cantilever pipe 4 is equal to the width of the cutting riser and gating area. To keep the exhaust cantilever pipe 4 horizontal, a diagonal steel wire rope 42 is provided at the end away from the rotary drive mechanism, and the other end of the diagonal steel wire rope 42 is usually fixed to the factory building column.

[0036] The aforementioned duct connector 6 includes an L-shaped sealed cavity structure with a first lower opening 61 and a second lower opening 62. The first lower opening 61 is located on the higher bottom surface, which is situated on the top surface of the exhaust cantilever pipe 4; the second lower opening 62 is located on the lower bottom surface, which is situated on the outer side of the exhaust cantilever pipe 4. The first lower opening 61 is used to connect to the exhaust cantilever pipe 4, and the second lower opening 62 is used to connect to the collection hood 1. Through the duct connector 6, the flue gas drawn in by the collection hood 1 can enter the exhaust cantilever pipe 4, and then enter the dust removal mechanism 9 through the hose 10.

[0037] The aforementioned translation drive mechanism 5 includes a support frame 51, which is located on the side of the duct connector 6 away from the second lower opening 62. The top of the support frame 51 is welded to the side wall of the duct connector 6. A horizontal support 52 is provided at the bottom of the support frame 51, and a translation motor 53 is mounted on the horizontal support 52. The output shaft of the translation motor 53 is connected to a drive wheel 54, the top surface of which is in contact with the bottom surface of the exhaust cantilever pipe 4. Further, the translation drive mechanism 5 also includes a driven wheel 55 mounted on the duct connector 6. The top surface of the driven wheel 55 is also in contact with the bottom surface of the exhaust cantilever pipe 4 and is correspondingly positioned to the drive wheel 54. Preferably, the bottom surface of the exhaust cantilever pipe 4 has linear guide grooves corresponding to the drive wheel 54 and the driven wheel 55, respectively. When the translation motor 53 is started, the drive wheel 54 rotates, causing the duct connector 6 to move along the exhaust cantilever pipe 4. Besides the above-described form, the translation drive mechanism 5 can also be configured with other structures depending on the actual situation. For example, the drive wheel 55 can be set on the side wall of the duct connector 6, or instead of using the translation motor 53 as the power source, a pair of traction mechanisms can be used. The traction mechanisms are set at both ends of the exhaust cantilever pipe 4, and the traction ropes of the two traction mechanisms are connected to the duct connector 6 respectively. When in use, the duct connector 6 can be moved in the target direction by pulling the two traction ropes in and out.

[0038] The aforementioned negative pressure sealing connection mechanism 7 includes a sealing belt 71 disposed at the top of the exhaust cantilever pipe 4 for sealing the longitudinal ventilation opening 41, and four support rollers disposed within the duct connector 6. The support rollers are perpendicular to the exhaust cantilever pipe 4, extending from the first lower opening 61 to the second lower opening 62. The four support rollers are located at the four corners of the cavity above the first opening 61, including a pair of lower outer rollers 72 and a pair of upper inner rollers 73. The end of each support roller is fixed by contacting the inner wall of the duct connector 6. After the sealing belt 71 enters the duct connector 6, it winds sequentially along the first outer roller 72 → first inner roller 73 → second inner roller 73 → second outer roller 72. After winding, both outer rollers 72 are located between the sealing belt 71 and the inner wall of the duct connector 6, and both inner rollers 73 are located inside the sealing belt 71. The sealing belt 71 is supported by four rollers, causing the section of sealing belt 71 corresponding to the first opening 61 inside the duct connector 6 to move away from the exhaust cantilever pipe 4, even if the longitudinal vent 41 of the exhaust cantilever pipe 4 at that section is open. During operation, because the exhaust cantilever pipe 4 is in a negative pressure environment, the sealing belt 71 can adhere to and block the longitudinal vent 41. As the duct connector 6 moves, the longitudinal vent 41 section inside it is opened, forming a passage between the collection hood 1, the exhaust cantilever pipe 4, and the dust removal mechanism 9, while the longitudinal vent 41 outside the duct connector 6 remains closed, not affecting the overall air volume of the system.

[0039] The aforementioned lifting drive mechanism 8 includes a support platform 81 located below the exhaust cantilever pipe 4 and connected to the duct connector 6. A lifting motor is mounted on the support platform 81, and a winding shaft 82 is located at the output end of the lifting motor. The winding shaft 82 is parallel to the exhaust cantilever pipe 4, and each end of the winding shaft 82 is connected to a lifting rope 83 connected to the trapping hood 1. When the lifting motor operates, the lifting ropes 83 on both sides simultaneously wind up or unwind, thereby smoothly lifting or lowering the trapping hood 1. In this embodiment, the support platform 81 is located directly below the first lower opening 61 of the duct connector 6, with one end connected to the outer side wall of the duct connector 6 cavity where the second lower opening 62 is located, and the other end connected to the end of the support frame 51 of the translation drive mechanism 5. Since the support frame 51 is equipped with a translation motor 53 on its outer side and the support platform 81 is equipped with a lifting motor, the weight of the corrugated telescopic pipe 2 and the trap hood 1 connected to the duct connector 6 can be balanced, and the first lower opening 61 of the duct connector 6 can be tightly pressed onto the exhaust cantilever pipe 4 to prevent air leakage from the duct connector 6.

[0040] The aforementioned dust removal mechanism 9 is located outside the cutting and pouring area, and includes a dust collector 91 connected to the hose 10, and an exhaust fan 92 located at the outlet end of the dust collector 91.

[0041] The cantilevered cutting riser and gating gas collection method of the present invention first turns on the exhaust fan 92 to put the system pipeline into a negative pressure suction state. Then, according to the specific work position of the small and medium casting cutting riser, the rotary motor is started to make the exhaust cantilever pipe 4 rotate along the rotation axis 31 until it reaches above the target work position. Next, the translation motor 53 is started to move the air duct connector 6 along the exhaust cantilever pipe 4 until it reaches above the target work position. Finally, the lifting motor is started to adjust the collection hood 1 to a suitable height. At this time, all the flue gas generated by the cutting riser and gating gas enters the collection hood 1, and enters the second lower opening 62 along the corrugated telescopic pipe 2, and then enters the exhaust cantilever pipe 4 through the first lower opening 61 of the air duct connector 6. Finally, it is discharged into the dust collector 91 through the hose 10. After dust removal, the qualified flue gas is discharged into the atmosphere through the exhaust fan 92.

[0042] The starting and stopping of the aforementioned exhaust fan 92, rotary motor, translation motor 53 and lifting motor can be centrally managed and intelligently linked through an automated control system, thereby improving control accuracy and reducing manual workload.

[0043] It should be noted that in the description of this invention, terms such as "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

Claims

1. A method for collecting flue gas from a cantilevered cutting riser, implemented using a flue gas collection device, characterized in that: The flue gas collection device includes a collection hood, a flue gas negative pressure transmission mechanism, and a dust removal mechanism. The head of the collection hood has a porous structure, and the tail of the collection hood is provided with a corrugated telescopic tube. The flue gas negative pressure transmission mechanism includes a rotary drive mechanism, which is connected to an exhaust cantilever pipe located above the cutting riser area. The exhaust cantilever pipe is provided with a duct connector connected to a translation drive mechanism. The duct connector has a first lower opening and a second lower opening. The first lower opening is opposite to the longitudinal ventilation port at the top of the exhaust cantilever pipe and is connected through a negative pressure sealing connection mechanism. The second lower opening is located on the outside of the exhaust cantilever pipe and is connected to the corrugated telescopic tube. The duct connector is also provided with a lifting drive mechanism, which is connected to the collection hood and is used to extend or retract the corrugated telescopic tube. A flexible hose connected to the dust removal mechanism is provided at one end of the exhaust cantilever pipe near the edge of the cutting riser area. The translation drive mechanism includes a support frame, which is located on the side of the duct connector away from the second lower opening. The top of the support frame is connected to the duct connector, and a horizontal support is provided at the bottom of the support frame. A translation motor is provided on the horizontal support, and the output shaft of the translation motor is connected to the drive wheel. The top surface of the drive wheel is connected to the bottom surface of the exhaust cantilever pipe. The translation drive mechanism also includes a driven wheel mounted on the duct connector. The top surface of the driven wheel is in contact with the bottom surface of the exhaust cantilever pipe and is correspondingly mounted to the driving wheel. The negative pressure sealing connection mechanism includes a sealing belt set at the top of the exhaust cantilever pipe for sealing the longitudinal ventilation opening, and a support roller shaft set inside the duct connector. The support roller shaft is perpendicular to the exhaust cantilever pipe and set at the four corners above the first lower opening. It includes a pair of lower outer roller shafts and a pair of upper inner roller shafts. After the sealing belt enters the duct connector, it is wound around the first outer roller shaft → the first inner roller shaft → the second inner roller shaft → the second outer roller shaft in sequence. After the winding is completed, the outer roller shaft is set between the sealing belt and the inner wall of the duct connector, and the inner roller shaft is set inside the sealing belt. The lifting drive mechanism includes a support platform located below the exhaust cantilever pipe and connected to the duct connector. A lifting motor is installed on the support platform. A winding shaft is installed at the output end of the lifting motor. The winding shaft is arranged parallel to the exhaust cantilever pipe. A lifting rope connected to the collection hood is installed at each end of the winding shaft. The flue gas capture method includes: first, activating the dust removal mechanism to put the system pipeline into a negative pressure suction state; then, according to the specific work position of the cutting riser and gating point of the small and medium-sized castings, sequentially activating the rotary drive mechanism, the translation drive mechanism, and the lifting drive mechanism to adjust the position of the exhaust cantilever pipe, the position of the duct connector, and the height of the capture hood, respectively. When the capture hood reaches the target position, due to the negative pressure suction, the flue gas generated from cutting the riser and gating point enters the capture hood, the corrugated expansion pipe, the duct connector, the exhaust cantilever pipe, and the dust removal mechanism in sequence. After dust removal treatment, the flue gas is discharged in compliance with standards.

2. The cantilever cutting riser flue gas collection method according to claim 1, characterized in that: The trapping hood has a conical structure, and the head of the trapping hood is provided with a perforated hood plate. The outer edge of the hood plate is provided with round or elliptical holes arranged in a double ring shape, and the porosity of the hood plate is 0.2 to 0.

4. The trap is conical in shape with a circular opening. The cover opening has a porous structure consisting of round or elliptical holes, which are arranged in a double ring along the outer edge. The porosity of the cover opening is 0.2 to 0.

4.

3. The cantilever cutting riser flue gas collection method according to claim 1, characterized in that: The rotary drive mechanism is located outside the cutting riser area and includes a rotary motor. The output shaft of the rotary motor is connected to a vertically arranged rotary shaft through a belt drive mechanism. The rotary shaft is fixedly connected to the end of the exhaust cantilever pipe.

4. The cantilever cutting riser flue gas collection method according to claim 1, characterized in that: The rotation radius of the exhaust cantilever pipe is equal to the width of the cutting riser area, and the end of the exhaust cantilever pipe away from the rotation drive mechanism is provided with a diagonal steel wire rope connected to the factory column.

5. The cantilever cutting riser flue gas collection method according to claim 1, characterized in that: The duct connector includes an L-shaped sealed cavity structure with a first lower opening and a second lower opening, wherein the first lower opening is located on the higher bottom surface and the second lower opening is located on the lower bottom surface.

6. The method for collecting flue gas from a cantilevered cutting riser as described in claim 1, characterized in that: The dust removal mechanism is located outside the cutting and pouring area, and includes a dust collector connected to the hose. An exhaust fan is provided at the outlet end of the dust collector.

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