A roller hearth oven oil fume adsorption device and control method

Abstract

The application discloses a kind of oil fume adsorption devices and control methods for roller hearth, including one end connecting heating chamber's feed roller, the feed roller includes roller bed and a plurality of roller bars arranged at intervals on the roller bed;A plurality of photoelectric detection switches and a plurality of negative pressure adsorption devices are provided on the roller bed, the photoelectric detection switches and the negative pressure adsorption devices are sequentially staggered along the conveying direction, and there is a roller between each adjacent photoelectric detection switch and negative pressure adsorption device;The application detects the conveying position of the tail end of the steel pipe by setting the photoelectric detection switch, only opens the negative pressure adsorption device near the tail end of the steel pipe to collect the water vapor, oil fume and other gases that come out before the tail of the steel pipe enters the furnace, reduces the power of the air extractor, avoids energy waste and saves cost.

Description

Technical Field

[0001] This invention relates to the field of oil fume treatment devices for roller hearth furnaces, and specifically to an oil fume adsorption device and control method for roller hearth furnaces. Background Technology

[0002] Currently, most steel pipes undergo calcination, saponification, and precision rolling before entering the heat treatment stage. These pipes have a large amount of mechanical lubricating oil and other grease on their surface; these are referred to as oil pipes. When the oil pipes enter the roller hearth heat treatment furnace, the front section of the pipe has already entered the high-temperature zone, while a large portion of the pipe remains outside the furnace. Due to production process requirements, the roller hearth furnace needs to operate in a slightly positive pressure environment. This results in a large amount of water vapor and oil fumes escaping from the tail of the steel pipe, significantly impacting the workshop and surrounding environment.

[0003] This situation necessitates the use of an oil fume collection system to collect the oil fumes and treat them centrally. Traditional oil fume collection systems consist of a fume hood installed above the furnace inlet side of the external feeding conveyor rollers. The hood is approximately 6 meters long, adjusted according to the length of the steel pipe. The disadvantages of this system are: it occupies a large space above the rollers, causing significant inconvenience for workers loading materials; furthermore, because the hood is open, a large amount of air is drawn into it, greatly reducing its collection efficiency; this also places a heavy burden on the subsequent exhaust fans, requiring relatively large exhaust fan power and a large chimney. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing an oil fume adsorption device and control method for roller hearth furnaces. By setting a photoelectric detection switch to detect the transport position of the steel pipe tail end, only the negative pressure adsorption device near the steel pipe tail end is activated to collect water vapor, oil fumes and other gases that emerge from the steel pipe tail end before entering the furnace. This reduces the power of the exhaust fan, avoids energy waste, and saves costs.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A fume adsorption device for a roller hearth furnace includes a feed roller conveyor connected to a heating chamber at one end. The feed roller conveyor includes a roller conveyor frame and a plurality of roller bars spaced apart on the roller conveyor frame. The roller conveyor frame is equipped with a plurality of photoelectric detection switches and a plurality of negative pressure adsorption devices. The photoelectric detection switches and the negative pressure adsorption devices are arranged alternately along the conveying direction, with a roller bar spaced apart between each adjacent photoelectric detection switch and negative pressure adsorption device.

[0007] The negative pressure adsorption device includes a negative pressure adsorption tube, which is fixedly installed on the roller conveyor frame and parallel to the axial direction of the roller. The negative pressure adsorption tube has several adsorption openings along its length. Each negative pressure adsorption tube is connected to a smoke exhaust branch pipe, and each smoke exhaust branch pipe is connected to a pneumatic switch valve. All smoke exhaust branch pipes are connected to a common smoke collection pipe.

[0008] A smoke collection hood is fixedly installed above the end of the feed roller conveyor near the heating chamber. The smoke collection hood is staggered vertically from the negative pressure adsorption device. The smoke collection hood is connected to the exhaust pipe. The exhaust pipe and the smoke collection pipe are connected to a common smoke collection pipe. The common smoke collection pipe is connected to an exhaust fan.

[0009] A control method for an oil fume adsorption device for a roller hearth furnace includes the following steps:

[0010] S1. Load the steel pipe onto the rollers of the feeding roller conveyor, and adjust the height of all photoelectric detection switches to be flush with the steel pipe product. At this time, all photoelectric detection switches will detect the presence of material. The two negative pressure adsorption devices near the tail end of the steel pipe will be in the open state, and the remaining negative pressure adsorption devices will be in the closed state.

[0011] S2. The roller gradually transports the steel pipe to the left into the heating chamber. When the photoelectric detection switch near the tail end of the steel pipe detects a change from a material presence signal to a material absence signal, it indicates that the tail end of the steel pipe has passed the position of the photoelectric detection switch. The negative pressure adsorption device located to the right of the photoelectric detection switch closes after a predetermined delay. At the same time, the negative pressure adsorption device located to the left of the photoelectric detection switch opens after a predetermined delay.

[0012] S3. A fume hood is installed on the right side of the heating chamber and is kept open during the steel pipe feeding process. When the last photoelectric detection switch does not detect any material, the tail end of the steel pipe enters the range of the fume hood.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By setting a photoelectric detection switch to detect the transport position of the steel pipe tail end, only the negative pressure adsorption device near the steel pipe tail end is turned on to collect the water vapor, oil fumes and other gases that come out of the steel pipe tail end before entering the furnace, which reduces the power of the exhaust fan, avoids energy waste and saves costs.

[0015] 2. After the tail end of the steel pipe is completely out of the effective adsorption range of the previous negative pressure adsorption device, turn off the previous negative pressure adsorption device and turn on the second negative pressure adsorption device to the left of the photoelectric detection switch. This ensures that there are always negative pressure adsorption devices on both sides of the tail end of the steel pipe to adsorb the oil fumes, and that the devices can be seamlessly connected during the movement of the steel pipe to avoid poor adsorption effect on one side and the problem of oil fume diffusion.

[0016] 3. The fume hood is used to absorb a small amount of oil fumes overflowing from the heating chamber inlet. The sum of the opening area of ​​the fume hood in this solution and the opening area of ​​the negative pressure adsorption device in the open state is much smaller than the opening area of ​​the fume hood in the prior art, which reduces the amount of extra air intake and reduces the burden on the exhaust fan. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of an oil fume adsorption device for a roller hearth furnace according to the present invention;

[0018] Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 This is a top view schematic diagram of an oil fume adsorption device for a roller hearth furnace according to the present invention;

[0020] In the diagram: 1. Roller conveyor frame; 2. Roller bar; 3. Photoelectric detection switch; 4. Negative pressure adsorption device; 5. Pneumatic switch valve; 6. Smoke collection pipe; 7. Smoke collection hood; 8. Smoke exhaust pipe; 9. Smoke collection pipe. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0023] like Figures 1 to 3 As shown, an oil fume adsorption device for a roller hearth furnace includes a feed roller conveyor connected to a heating chamber at one end. The feed roller conveyor includes a roller conveyor frame 1 and a plurality of roller bars 2 spaced apart on the roller conveyor frame 1. The roller conveyor frame 1 is equipped with a plurality of photoelectric detection switches 3 and a plurality of negative pressure adsorption devices 4. The photoelectric detection switches 3 and negative pressure adsorption devices 4 are arranged alternately along the conveying direction, and a roller bar 2 is spaced apart between each adjacent photoelectric detection switch 3 and negative pressure adsorption device 4.

[0024] By setting a row of photoelectric detection switches on the feed roller conveyor, when the steel pipe is fed, all photoelectric detection switches can detect that there is material. As the steel pipe gradually enters the heating chamber, a large amount of oil fumes are emitted from the tail end because the front end of the steel pipe has already entered the high temperature zone and is heated.

[0025] The above solution detects the transport position of the steel pipe tail end by setting a photoelectric detection switch 3. Through computer program settings, only the negative pressure adsorption device near the tail end of the steel pipe is activated to collect water vapor, oil fumes and other gases that emerge from the tail end of the steel pipe before entering the furnace. This reduces the power of the exhaust fan, avoids energy waste, saves costs, and avoids the problem of existing technologies that require a large adsorption hood to cover the entire steel pipe, resulting in the intake of a large amount of extra air, causing excessive burden on the exhaust fan and energy waste.

[0026] like Figure 2 As shown, a specific example of the above scheme is that when one of the photoelectric detection switches 3 detects a change from a material presence to a material absence signal, it indicates that the tail end of the steel pipe has just passed this point. After receiving the detection change information from the photoelectric detection switch, the computer delays for a certain period of time and controls the negative pressure adsorption device 4 on the right side of the photoelectric detection switch to stop working. The purpose is to wait until the tail end of the steel pipe is completely out of the effective adsorption range of the negative pressure adsorption device 4 on the right side of the photoelectric detection switch 3 before turning off the negative pressure adsorption device 4. At the same time, the second negative pressure adsorption device 4 on the left side of the photoelectric detection switch 3 is turned on, thereby ensuring that there are always negative pressure adsorption devices 4 on both sides of the tail end of the steel pipe to adsorb the oil fumes, avoiding poor adsorption effect on one side and causing the oil fumes to spread.

[0027] The negative pressure adsorption device 4 includes a negative pressure adsorption tube, which is fixedly installed on the roller conveyor frame 1 and parallel to the roller bar 2 axially, reducing the space occupied by the negative pressure adsorption tube. The negative pressure adsorption tube has several adsorption openings along its length, so that when multiple parallel steel pipes are placed on the roller bar 2 at the same time, it can effectively adsorb oil fumes, expanding the adsorption area of ​​the negative pressure adsorption tube and increasing its adaptability. Each of the negative pressure adsorption tubes is connected to an exhaust branch pipe, and each exhaust branch pipe is connected to a pneumatic switch valve 5. All exhaust branch pipes are connected to a common smoke collection pipe 6. Each negative pressure adsorption device only needs to be connected to a smaller exhaust branch pipe, and then the smoke is collected and sent to the oil fume treatment device, reducing the overall space occupied by the exhaust pipe.

[0028] A fume hood 7 is fixedly installed above the end of the feed roller conveyor closest to the heating chamber. The fume hood 7 and the negative pressure adsorption device 4 are staggered vertically. The fume hood 7 is connected to the exhaust pipe 8, and the exhaust pipe 8 and the fume hood 6 are connected to the collection pipe 9, which is connected to the exhaust fan. The fume hood 7 is always open to collect the oil fumes overflowing from the heating chamber inlet. By connecting both the fume hood 7 and the negative pressure adsorption device 4 to the collection pipe 9 and using a single negative pressure system for control, the number of pipes and space occupied are saved, reducing costs.

[0029] The present invention also provides a control method for an oil fume adsorption device for a roller hearth furnace, comprising the following steps:

[0030] S1. Load the steel pipe onto the roller bar 2 of the feeding roller conveyor. Adjust the height of all photoelectric detection switches 3 to be flush with the steel pipe product, for example, 10mm. At this time, all photoelectric detection switches 3 will detect the presence of material. The two negative pressure adsorption devices 4 near the tail end of the steel pipe will be in the open state, and the remaining negative pressure adsorption devices 4 will be in the closed state.

[0031] The length of the feed roller can be adjusted according to the length of the steel pipe to ensure that after the steel pipe is fed, the tail end of the steel pipe is located between the two negative pressure adsorption devices 4. The two negative pressure adsorption devices 4 are set to be in the open state and the other negative pressure adsorption devices 4 are in the closed state through computer program settings.

[0032] S2, the roller 2 gradually transports the steel pipe to the left into the heating chamber. When the photoelectric detection switch 3 near the tail end of the steel pipe detects that there is material, it changes to a signal that there is no material. This indicates that the tail end of the steel pipe has passed the position of the photoelectric detection switch 3. The negative pressure adsorption device 4 located to the right of the photoelectric detection switch 3 closes after a predetermined time. At the same time, the second negative pressure adsorption device 4 located to the left of the photoelectric detection switch 3 opens after a predetermined time. At this time, the tail end of the steel pipe just passes the first negative pressure adsorption device 4 to the left of the photoelectric detection switch 3.

[0033] The purpose of the above-mentioned delayed closing and opening scheme is to close the first negative pressure adsorption device 4 only after the tail end of the steel pipe has completely left the effective adsorption range of the first negative pressure adsorption device 4, and at the same time open the second negative pressure adsorption device 4 on the left side of the photoelectric detection switch 3. This ensures that there are always negative pressure adsorption devices 4 on both sides of the tail end of the steel pipe to adsorb the oil fumes, and that the adsorption is seamlessly connected during the movement of the steel pipe, avoiding the problem of poor adsorption effect on one side and causing the oil fume to spread.

[0034] Preferably, in some embodiments, the photoelectric detection switch 3 or the negative pressure adsorption device 4 is located at the center of two adjacent rollers 2. When the tail end of the steel pipe passes through two adjacent photoelectric detection switches 3 in sequence, the computer calculates the transport speed of the steel pipe based on the information feedback, and then automatically calculates the delay value based on the inherent distance between the rollers 2. This ensures that the negative pressure adsorption device 4 is always present on both sides of the tail end of the steel pipe to adsorb the oil fumes at different transport speeds, and that the connection is seamless during the movement of the steel pipe.

[0035] S3. A fume hood 7 is installed on the right side of the heating chamber and kept open during the steel pipe feeding process. When the last photoelectric detection switch 3 fails to detect material, the tail end of the steel pipe enters the range of the fume hood 7.

[0036] The fume hood 7 is used to absorb a small amount of oil fumes overflowing from the heating chamber inlet. The fume hood 7 only needs to be set to about 1 meter to achieve this function. The sum of the opening area of ​​the fume hood 7 in this solution and the opening area of ​​the negative pressure adsorption device 4 in the open state is much smaller than the opening area of ​​the fume hood in the prior art, which reduces the amount of extra air intake and reduces the burden on the exhaust fan.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fume adsorption device for a roller hearth furnace, comprising a feed roller conveyor connected at one end to a heating chamber, the feed roller conveyor comprising a roller conveyor frame (1) and a plurality of roller bars (2) spaced apart on the roller conveyor frame (1); characterized in that, The roller conveyor frame (1) is provided with a number of photoelectric detection switches (3) and a number of negative pressure adsorption devices (4). The photoelectric detection switches (3) and the negative pressure adsorption devices (4) are arranged alternately along the conveying direction. There is a roller bar (2) between each adjacent photoelectric detection switch (3) and negative pressure adsorption device (4).

2. The oil fume adsorption device for a roller hearth furnace according to claim 1, characterized in that, The negative pressure adsorption device (4) includes a negative pressure adsorption tube, which is fixedly installed with the roller frame (1) and is parallel to the axial direction of the roller (2). The negative pressure adsorption tube has several adsorption openings along its length. Each negative pressure adsorption tube is connected to a smoke exhaust branch pipe, and each smoke exhaust branch pipe is connected to a pneumatic switch valve (5). All smoke exhaust branch pipes are connected to a smoke collection pipe (6).

3. The oil fume adsorption device for a roller hearth furnace according to claim 2, characterized in that, A smoke collection hood (7) is fixedly installed above the end of the feed roller conveyor near the heating chamber. The smoke collection hood (7) and the negative pressure adsorption device (4) are staggered vertically. The smoke collection hood (7) is connected to the exhaust pipe (8). The exhaust pipe (8) and the smoke collection pipe (6) are connected to the collection pipe (9). The collection pipe (9) is connected to the exhaust fan.

4. The oil fume adsorption device for a roller hearth furnace according to claim 1, characterized in that, The photoelectric detection switch (3) or the negative pressure adsorption device (4) is located at the center of two adjacent rollers (2).

5. A control method for the oil fume adsorption device for a roller hearth furnace as described in claim 3, characterized in that, Includes the following steps: S1. Load the steel pipe onto the roller bar (2) of the feeding roller conveyor. Adjust the height of all photoelectric detection switches (3) to be flush with the steel pipe product. At this time, all photoelectric detection switches (3) will detect the presence of material. The two negative pressure adsorption devices (4) near the tail end of the steel pipe will be in the open state, and the remaining negative pressure adsorption devices (4) will be in the closed state. S2. The roller (2) gradually transports the steel pipe to the heating chamber to the left. When the photoelectric detection switch (3) near the end of the steel pipe detects that there is material, it changes to a signal of no material. The negative pressure adsorption device (4) located to the right of the photoelectric detection switch (3) closes after a predetermined time. The second negative pressure adsorption device (4) located to the left of the photoelectric detection switch (3) opens after a predetermined time. At this time, the end of the steel pipe just passes the first negative pressure adsorption device (4) to the left of the photoelectric detection switch (3). S3. A smoke hood (7) is installed on the right side of the heating chamber and kept open during the feeding process of the steel pipe. When the last photoelectric detection switch (3) does not detect any material, the tail end of the steel pipe enters the range of the smoke hood (7).

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