Oil smoke collecting device for prestressed steel strand intermediate frequency furnace

Abstract

The invention relates to a lampblack collecting device for a prestressed steel strand intermediate frequency furnace. The lampblack collecting device comprises a door frame, a smoke exhaust pipe, a smoke collecting bin, a first smoke collecting pipe, a second smoke collecting pipe and a negative-pressure pumping and exhausting system, wherein the two ends of the first smoke collecting pipe and the two ends of the second smoke collecting pipe are closed. A smoke exhaust pipe is arranged in the portal frame in an up-down lifting mode, the section of the smoke exhaust pipe is in a C shape, the steel strand penetrates through the smoke exhaust pipe, and a smoke collecting bin is arranged at one end of the smoke exhaust pipe and covers the periphery and the upper portion of an outlet of the intermediate frequency furnace; a first smoke collecting pipe is arranged in the middle of the smoke exhaust pipe, a second smoke collecting pipe is arranged at the other end of the smoke exhaust pipe, and one end of the second smoke collecting pipe extends out of the end of the smoke exhaust pipe. Narrow-slit-shaped air openings are formed in the bottoms of the first smoke collecting pipe and the second smoke collecting pipe and communicate with the smoke exhaust pipe, and the negative pressure pumping and exhausting system communicates with the smoke collecting bin, the first smoke collecting pipe and the second smoke collecting pipe. The steel strand is wrapped in the smoke exhaust pipe, oil smoke diffusion is limited, meanwhile, different pumping and exhausting structures are designed according to different oil smoke emission amounts in all stages, and oil smoke generated in the production process is collected thoroughly in stages.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and in particular to a fume collection device for a medium-frequency furnace for prestressed steel strands. Background Technology

[0002] Prestressed steel strand, also known as steel cable, is a metal product made of multiple steel wires twisted together. It is widely used in engineering fields such as highways, railway bridges, bridge cables, large stadium construction, and energy. After the steel strand is twisted and formed, in order to reduce stress relaxation during application, the steel strand must undergo short-time heat treatment in an induction furnace under a certain tension, also known as stabilization treatment.

[0003] Prestressed steel strand is produced by pickling or mechanically peeling 82B wire rod to remove surface iron oxide scale, followed by phosphating and boronizing treatment, and then drawing, twisting, and stabilizing. During the wire drawing process, the surface of the semi-finished steel wire is coated with phosphating and boronizing films and drawing powder. Therefore, during the subsequent twisting and stabilization treatment, the steel wire undergoes heat treatment in an induction furnace, during which these surface deposits carbonize, burn, and produce fumes and odors, polluting the environment and impacting workers' health.

[0004] For the treatment of oil fumes, a conical fume hood is usually installed above the intermediate frequency furnace to collect the oil fumes generated during the stabilization process of the prestressed steel strands. These fumes are then treated by a low-temperature plasma purification device and an activated adsorption fan before being discharged into the air through ducts to meet national environmental emission standards, thus reducing pollution to the workshop environment. However, it should be noted that after the steel strands are removed from the intermediate frequency furnace and moved towards the cooling water tank, the steel wires are exposed to the air, and the oil fumes they carry will disperse and also affect the workshop environment.

[0005] Based on this, patent publication number CN203602681U discloses a flue gas exhaust device for a PC steel strand intermediate frequency furnace. The exhaust hood covers the entire active area of ​​the intermediate frequency furnace, from the furnace itself to the cooling water tank. It can collect oil fumes emitted from the furnace, as well as those emitted after the steel strands are removed from the furnace. A skirt is provided at the lower edge of the exhaust hood to significantly control the overflow of flue gas. The exhaust hood has a certain width to match the width of the intermediate frequency furnace, and the vertical distance between the exhaust hood and the furnace is small, thus enabling timely and effective collection of oil fumes.

[0006] However, the cross-section of the steel strand is circular, much smaller than the width of the fume hood, and the vertical distance between the steel strand and the fume hood is large. The steel strand is constantly in motion, resulting in a large diffusion area for the oil fumes emitted by the steel strand. It may take a certain amount of diffusion before the oil fumes are collected by the fume hood. Therefore, conventional fume hoods are much less effective at collecting oil fumes emitted by the steel strand during movement. Moreover, the oil stains adhering to the inner wall of the fume hood are difficult to clean and will also affect the fume extraction effect. Summary of the Invention

[0007] To address the problem that existing fume hoods are ineffective in collecting and cleaning oil fumes emitted by moving steel strands, this invention provides an oil fume collection device for a medium-frequency furnace used for prestressed steel strands. The device uses a C-shaped exhaust pipe to enclose the steel strands between the furnace and the cooling water tank, confining the released oil fumes within. Different extraction structures are installed on the exhaust pipe according to the amount of oil fume emitted at each stage, allowing for phased collection of the fumes and ensuring effective collection. Simultaneously, a cleaning mechanism is slidably connected inside the exhaust pipe to clean the oil stains on its inner wall.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A fume collection device for a medium-frequency furnace for prestressed steel strands, used for collecting and cleaning fume emitted from the steel strands between the medium-frequency furnace and the cooling water tank, includes a gantry, a smoke exhaust pipe, a smoke collection chamber, two smoke collection pipes (one and two) sealed at both ends, and a negative pressure extraction system.

[0010] The exhaust pipe is installed vertically inside the gantry, which facilitates the entry and exit of the steel strands. The exhaust pipe has a "C" shaped cross-section. The steel strands between the intermediate frequency furnace and the cooling water tank are passed through the exhaust pipe, which makes it easy to wrap the steel strands inside. The exhaust pipe is equipped with a smoke collection chamber at one end. The smoke collection chamber covers the area around and above the outlet of the intermediate frequency furnace, effectively collecting a large amount of oil fumes at the outlet of the intermediate frequency furnace.

[0011] The smoke collection pipe 1 is provided in the middle of the exhaust pipe. The smoke collection pipe 1 is arranged parallel to the exhaust pipe vertically. The smoke collection pipe 2 is provided at the other end of the exhaust pipe. The smoke collection pipe 2 has the same structure as the smoke collection pipe 1. The smoke collection pipe 1 and the smoke collection pipe 2 are arranged coaxially. One end of the smoke collection pipe 2 extends out of the end of the exhaust pipe.

[0012] Both the first and second smoke collection pipes have narrow slit-shaped air vents at their bottoms for connecting to the exhaust pipes; a negative pressure extraction system is installed on the upper part of the gantry, and the negative pressure extraction system is connected to the smoke collection chamber, the first smoke collection pipe, and the second smoke collection pipe, respectively.

[0013] Furthermore, the gantry is a portal-shaped steel structure frame welded from profiles, possessing sufficient structural strength to support the exhaust pipe. The gantry is positioned between the intermediate frequency furnace and the cooling water tank, and at least two winches are installed on the gantry. The winches correspond to the ends of the exhaust pipe, with their wire ropes hooking downwards onto the exhaust pipe. The winches facilitate convenient control of the vertical movement of the exhaust pipe.

[0014] Furthermore, the length of the exhaust pipe is greater than the length of the gantry, and at least two guide components are provided between the exhaust pipe and the gantry to guide the exhaust pipe vertically up and down, preventing it from swaying back and forth during lifting. Multiple tension springs are also provided between the exhaust pipe and the gantry for hooking the exhaust pipe; the tension springs are arranged side-by-side with the guide components. The tension springs facilitate the support of the exhaust pipe, preventing it from sagging in the middle.

[0015] Furthermore, each of the guide components includes a fixed sleeve and a sliding rod. The fixed sleeve is fixedly connected to the gantry upwards, and the sliding rod is fixedly connected to the exhaust pipe downwards. The upper end of the sliding rod extends into the fixed sleeve and slides up and down along the fixed sleeve.

[0016] Furthermore, the exhaust pipe is horizontally arranged with open ends, and is wrapped with steel strands. The smoke collection chamber includes a chamber body and a cover. The chamber body is bent into a "U" shape and surrounds the outlet of the intermediate frequency furnace. The cover is installed on top of the chamber body, covering the outlet of the intermediate frequency furnace. This facilitates multi-directional restriction of oil fumes at the outlet of the intermediate frequency furnace.

[0017] Furthermore, the diameter of the first smoke collection pipe is larger than that of the exhaust pipe, and the first smoke collection pipe is connected to the exhaust pipe vertically through the air vent. The second smoke collection pipe is longer than the first smoke collection pipe, and the second smoke collection pipe is also connected to the exhaust pipe vertically through the air vent.

[0018] Furthermore, the negative pressure exhaust system includes a main exhaust duct connected to a ventilation fan, an auxiliary exhaust duct, and an exhaust hose. The main exhaust duct is installed on the gantry, and one end of the main exhaust duct is bent vertically downwards.

[0019] An exhaust branch pipe is connected to the exhaust pipe between the smoke collection pipe and the smoke collection chamber. The exhaust branch pipe extends upward into the main exhaust pipe and is connected to the main exhaust pipe. The exhaust branch pipe slides up and down along the main exhaust pipe.

[0020] Furthermore, the auxiliary exhaust duct is installed on the gantry, and the auxiliary exhaust duct is connected to the main exhaust duct through the exhaust hose. The auxiliary exhaust duct and the smoke exhaust duct are arranged in parallel with vertical spacing.

[0021] The auxiliary exhaust duct is connected to the smoke collection duct 1 by an exhaust hose 1, the auxiliary exhaust duct is connected to the smoke collection duct 2 by an exhaust hose 2, and the main exhaust duct is connected to the smoke collection chamber by an exhaust bend.

[0022] Furthermore, the lower opening of the exhaust pipe forms a "C" shaped cross section, the width of the exhaust pipe opening is greater than the width of the air vent, and the two sides of the exhaust pipe opening bend inward to form an oil baffle, which prevents oil from flowing downward randomly and facilitates the guidance of oil flow.

[0023] A cleaning mechanism is slidably connected inside the exhaust pipe. The cleaning mechanism includes a sliding frame slidably connected to the outside of the exhaust pipe and a cleaning frame disposed inside the exhaust pipe and moving with the sliding frame. A spraying component is located in the center of the cleaning frame, and brush plates are located on both sides. The spraying component and brush plates abut against the inner wall of the exhaust pipe. This movable cleaning mechanism facilitates the cleaning of grease and grime from the inner wall of the exhaust pipe.

[0024] The beneficial effects of the present invention through the above technical solution are:

[0025] The present invention has a reasonable structural design. The cross-section of the exhaust pipe is designed as "C". The steel strand that emits oil fumes travels inside the exhaust pipe. The exhaust pipe can wrap the steel strand. Due to the small space inside the exhaust pipe, the oil fumes are easy to collect, so that the oil fumes generated on the steel strand after it comes out of the intermediate frequency furnace will not escape out of the exhaust pipe.

[0026] Driven by a winch and guided by a guiding component, the exhaust pipe of this invention can move vertically up and down. During production, the winch covers the steel strand emitting fumes with the exhaust pipe. When production stops, the wire breaks, or an abnormality occurs requiring handling, the exhaust pipe is raised. The "C"-shaped cross-section design of the exhaust pipe allows the steel strand to be easily inserted or removed from the bottom, eliminating the need for complex threading operations at the pipe end, greatly improving production efficiency and facilitating maintenance.

[0027] This invention designs smoke collection chambers and pipes of different shapes based on the varying amounts of oily fumes emitted at different stages of the steel strand's movement. This allows for the phased collection of oily fumes generated during production, ensuring the complete removal of these fumes. The smoke collection chambers, positioned around and above the outlet of the intermediate frequency furnace, effectively remove most of the oily fumes. Smoke collection pipes one and two collect any remaining oily fumes from the steel strand.

[0028] This invention utilizes the fact that the exhaust pipe opens downwards, essentially acting as a semi-enclosed conduit, restricting the flow of flue gas within a limited channel. After the negative pressure extraction system is operational, the exhaust pipe is under negative pressure, forcing the fumes to move along the pipe towards the extraction point instead of spreading randomly. Furthermore, air from outside the exhaust pipe is drawn in through the lower opening, continuously flowing into the pipe and forming an invisible air barrier that prevents the fumes from escaping. Simultaneously, the intake of workshop air from the lower opening not only prevents fumes leakage but also cools and dilutes the high-temperature steel strands and fumes, reducing the temperature and concentration of the fumes within the pipe, thus facilitating subsequent waste gas treatment.

[0029] The narrow slit-shaped air vent of this invention is a long, narrow gap. After the negative pressure exhaust system is running, a pressure equalization chamber is formed inside the first smoke collection pipe, and the air vent itself forms a relatively uniform negative pressure zone, resulting in a uniform negative pressure distribution. The second smoke collection pipe operates on the same principle. In this way, the exhaust pipe can be divided into two independent suction areas, each with an independent air vent, achieving uniform adsorption of oil fumes at different locations in the exhaust pipe.

[0030] This invention also limits the width of the air vent to be smaller than the width of the lower opening of the exhaust pipe. The narrower vent increases the airflow velocity at this point, resulting in a stronger trapping force. This more reliably draws the fumes drawn in from the edge of the lower opening into the narrow gap, preventing them from diffusing or escaping within the pipe. Furthermore, the air entering from the wide lower opening and then converging the fumes towards the narrow vent creates a clear and stable flow, reducing the possibility of turbulence or eddies within the pipe. Attached Figure Description

[0031] Figure 1 This is an overall front view of an oil fume collection device for a medium-frequency furnace of prestressed steel strand according to the present invention.

[0032] Figure 2 This invention relates to a fume collection device for an intermediate frequency furnace used in prestressed steel strand production. Figure 1 Front view of the central exhaust pipe.

[0033] Figure 3 This is a cross-sectional view of the fume collection chamber of an oil fume collection device for a prestressed steel strand medium-frequency furnace according to the present invention.

[0034] Figure 4 This is a cross-sectional view of the smoke collection pipe and the exhaust pipe connected in a smoke collection device for a medium-frequency furnace of prestressed steel strand according to the present invention.

[0035] Figure 5 This invention relates to a fume collection device for an intermediate frequency furnace used in prestressed steel strand production. Figure 2 A bottom view from direction A.

[0036] Figure 6 This is a schematic diagram of the cleaning mechanism in Embodiment 2 of the present invention, which is a fume collection device for a medium-frequency furnace of prestressed steel strand.

[0037] Figure 7 This is a schematic diagram of the cleaning mechanism in Embodiment 2 of the present invention, which is a fume collection device for a medium-frequency furnace of prestressed steel strand.

[0038] Figure 8 This is a schematic diagram of the spraying components and brush plate arrangement of an oil fume collection device for a prestressed steel strand medium-frequency furnace according to the present invention.

[0039] The attached diagram is labeled as follows: 1. Gantry, 2. Exhaust pipe, 3. Smoke collection chamber, 31. Chamber body, 32. Chamber cover, 4. Smoke collection pipe one, 5. Smoke collection pipe two, 6. Steel strand, 7. Winch, 81. Fixed sleeve, 82. Sliding rod, 9. Tension spring, 10. Rib plate, 11. Air outlet, 12. Main exhaust pipe, 13. Auxiliary exhaust pipe, 14. Exhaust hose, 15. Exhaust hose one, 16. Exhaust hose two, 17. Exhaust bend, 18. Oil baffle, 19. Sliding frame, 191. Sliding plate, 192. Handheld frame, 20. Cleaning frame, 201. Cleaning top plate, 202. Cleaning support plate, 21. Upper roller, 22. Lower roller, 23. Spray pipe, 231. Spray hole, 24. Water supply pipe, 25. Sponge cover, 26. Brush plate, 27. Exhaust branch pipe. Detailed Implementation

[0040] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0041] Example 1:

[0042] like Figures 1-5 As shown, a fume collection device for a medium-frequency furnace for prestressed steel strands is used to collect and clean the fumes emitted from the steel strands 6 between the medium-frequency furnace and the cooling water tank. The fume collection device includes a gantry 1, a smoke exhaust pipe 2, a smoke collection chamber 3, two smoke collection pipes 4 and 5 sealed at both ends, and a negative pressure extraction system.

[0043] A gantry 1 is installed between the intermediate frequency furnace and the cooling water tank. The gantry 1 is a portal-shaped steel structure frame welded from profiles, and has a certain length. An exhaust pipe 2 is installed vertically inside the gantry 1. The exhaust pipe 2 is horizontally arranged, with open ends, and its length is greater than the length of the gantry 1. Steel strands 6 between the intermediate frequency furnace and the cooling water tank are threaded through the exhaust pipe 2. To allow the steel strands 6 to smoothly enter and exit the exhaust pipe 2, the exhaust pipe 2 has a "C"-shaped cross-section, meaning the lower opening of the exhaust pipe 2 forms a "C"-shaped cross-section. This allows the steel strands 6 to enter and exit through the lower opening of the exhaust pipe 2. After entering the exhaust pipe 2, the exhaust pipe 2 wraps around the steel strands 6.

[0044] For continuously produced steel strands 6, conventional closed circular pipes would make threading, maintenance, or troubleshooting wire breakage extremely inconvenient. The "C"-shaped cross-section design of the exhaust pipe 2 allows the steel strands 6 to be easily inserted or removed from the bottom, eliminating the need for complex threading operations at the pipe end, significantly improving production efficiency and simplifying maintenance.

[0045] The purpose of raising and lowering the exhaust pipe 2 is to lift it in case of equipment shutdown, line breakage, or other abnormalities requiring handling. To achieve this, at least two winches 7 are installed on the gantry 1. Each winch 7 corresponds to an end of the exhaust pipe 2, and its wire rope hooks downwards onto the exhaust pipe 2. Specifically, the wire rope of the winch 7 has a hook, and the exhaust pipe 2 has a lifting lug; the hook is attached to the lifting lug. Thus, through the simultaneous action of the two winches 7, the exhaust pipe 2 can be raised and lowered, with its weight supported by the winches 7.

[0046] In addition to the fact that the exhaust pipe 2 can move up and down, at least two guide components are also provided between the exhaust pipe 2 and the gantry 1 to prevent the exhaust pipe 2 from deviating during the movement and to provide guidance for the movement. The guide components are used to guide the exhaust pipe 2 to move up and down vertically and avoid swaying left and right.

[0047] In this embodiment, each guiding component includes a fixed sleeve 81 and a sliding rod 82. The fixed sleeve 81 is a square tube structure and is fixedly connected to the gantry 1 upwards. The sliding rod 82 is also a square tube structure, but its cross-section is smaller than that of the fixed sleeve 81. The sliding rod 82 is fixedly connected to the exhaust pipe 2 downwards. The upper end of the sliding rod 82 extends into the fixed sleeve 81 and slides up and down along the fixed sleeve 81, thereby providing guidance for the vertical movement of the exhaust pipe 2.

[0048] To better support the exhaust pipe 2 and distribute the force on the gantry 1, multiple tension springs 9 are installed between the exhaust pipe 2 and the gantry 1, arranged side by side with the guide components. The tension springs 9 are used to hook the exhaust pipe 2, that is, the upper end of the tension spring 9 hooks to the gantry 1 and the lower end hooks to the exhaust pipe 2. The axial tension of the tension spring 9 is used to lift the exhaust pipe 2 upward, avoiding excessive force on the end of the gantry 1, achieving uniform force distribution on the gantry 1, and also preventing the exhaust pipe 2 from sagging in the middle.

[0049] As the steel strand 6 moves between the intermediate frequency furnace and the cooling water tank, different positions result in different oil fume diffusion conditions. Therefore, in response to different situations, the oil fumes are collected in stages using the smoke collection chamber 3, smoke collection pipe one 4, and smoke collection pipe two 5 in sequence, following the direction of movement of the steel strand 6.

[0050] In the first stage: A smoke collection chamber 3 is set at one end of the exhaust pipe 2. The smoke collection chamber 3 covers the area around and above the outlet of the intermediate frequency furnace. After the steel strand 6 is moved out of the intermediate frequency furnace, there is a lot of oil smoke at the outlet of the intermediate frequency furnace. The smoke collection chamber 3 is used to wrap the outlet of the intermediate frequency furnace to prevent the oil smoke from spreading outward.

[0051] The smoke collection chamber 3 includes a chamber body 31 and a cover 32. The chamber body 31 is bent into a "U" shape and surrounds the outlet of the intermediate frequency furnace. The bottom, top, and one side of the chamber body 31 are open. The other side of the chamber body 31 is fixedly connected to the end of the exhaust pipe 2, and at least two triangular stiffening plates 10 are provided between the two to improve the structural strength of the installation of the chamber body 31 and the exhaust pipe 2. The cover 32 is provided on the top of the chamber body 31. The bottom of the cover 32 is open and the cover 32 communicates downward with the chamber body 31. One side of the cover 32 extends out of the chamber body 31 and covers the outlet of the intermediate frequency furnace. In this way, under the constraint of the smoke collection chamber 3, the outward diffusion of oil fumes at the outlet of the intermediate frequency furnace can be restricted, and the oil fumes are confined within the smoke collection chamber 3 and flow upward into the cover 32.

[0052] The second stage: A smoke collecting pipe 4 is installed in the middle of the exhaust pipe 2. The smoke collecting pipe 4 is closed at both ends and is arranged vertically parallel to the exhaust pipe 2. The diameter of the smoke collecting pipe 4 is larger than that of the exhaust pipe 2. The smoke collecting pipe 4 connects downward to the exhaust pipe 2. Specifically, a narrow slit-shaped air vent 11 is opened at the bottom of the smoke collecting pipe 4. The air vent 11 is used to connect to the exhaust pipe 2, that is, the smoke collecting pipe 4 is vertically connected to the exhaust pipe 2 through the air vent 11. The length direction of the air vent 11 is consistent with the axial direction of the smoke collecting pipe.

[0053] The third stage: A second smoke collection pipe 5 is installed at the other end of the exhaust pipe 2. When the second smoke collection pipe 5 is installed on the other end of the exhaust pipe 2, the lifting lug at the other end of the exhaust pipe 2 needs to be installed on the second smoke collection pipe 5. The second smoke collection pipe 5 has the same structure as the first smoke collection pipe 4, and the first smoke collection pipe 4 and the second smoke collection pipe 5 are arranged coaxially. A narrow slit-shaped air inlet 11 is also opened at the bottom of the second smoke collection pipe 5, and the second smoke collection pipe 5 is also connected to the exhaust pipe 2 vertically through the air inlet 11. The opening width L1 at the bottom of the exhaust pipe 2 is greater than the width L2 of the air inlet 11. The length of the second smoke collection pipe 5 is greater than that of the first smoke collection pipe 4, and one end of the second smoke collection pipe 5 extends out of the end of the exhaust pipe 2.

[0054] As described above, by setting up smoke collection chambers 3, smoke collection pipe one 4, and smoke collection pipe two 5 at different locations on the smoke exhaust pipe 2, the oil fumes emitted from the steel strand 6 can be collected in stages. The collection is achieved using negative pressure adsorption, specifically through a negative pressure extraction system. That is, a negative pressure extraction system is installed on the upper part of the gantry 1, and the negative pressure extraction system is connected to the smoke collection chamber 3, smoke collection pipe one 4, and smoke collection pipe two 5 respectively.

[0055] In this embodiment, the negative pressure exhaust system includes a main exhaust duct 12 connected to a ventilation fan, an auxiliary exhaust duct 13, and an exhaust hose 14. The main exhaust duct 12 is mounted on the gantry 1, and is bent into an "X" shape with a rounded transition at the bend. One end of the main exhaust duct 12 bends vertically downwards and connects directly to the smoke exhaust duct 2. Specifically, an exhaust branch pipe 27 is connected to the smoke exhaust duct 2 between the smoke collection duct 4 and the smoke collection chamber 3. The exhaust branch pipe 27 corresponds vertically to the main exhaust duct 12, extending upwards into the main exhaust duct 12 and connecting to it. When the smoke exhaust duct 2 moves up and down, it causes the exhaust branch pipe 27 to slide up and down along the main exhaust duct 12. This ensures the connection between the main exhaust duct 12 and the smoke exhaust duct 2 without affecting the movement of the smoke exhaust duct 2.

[0056] The auxiliary exhaust duct 13 is installed on the gantry 1. The auxiliary exhaust duct 13 and the smoke exhaust duct 2 are arranged parallel to each other vertically and are staggered. Because the smoke exhaust duct 2 is suspended by the winch 7, the winch 7 and the smoke exhaust duct 2 are directly aligned vertically. The auxiliary exhaust duct 13 can only be arranged on one side of the winch 7 and is staggered vertically from the smoke exhaust duct 2. The auxiliary exhaust duct 13 is connected to the main exhaust duct 12 through the exhaust hose 14. The auxiliary exhaust duct 13 and the exhaust hose 14 are located on the same straight line. The auxiliary exhaust duct 13 is connected to the main exhaust duct 12 through the exhaust hose 14.

[0057] A ventilation hose 15 connects the auxiliary exhaust duct 13 and the smoke collection duct 14. The smoke collection duct 14 is connected to the auxiliary exhaust duct 13 via the ventilation hose 15. A ventilation hose 26 connects the auxiliary exhaust duct 13 and the smoke collection duct 25. The smoke collection duct 25 is connected to the auxiliary exhaust duct 13 via the ventilation hose 26.

[0058] Meanwhile, an exhaust bend 17 connects the main exhaust duct 12 and the smoke collection chamber 3. One end of the exhaust bend 17 is connected to the cover 32 of the smoke collection chamber 3, and the other end is connected to the main exhaust duct 12. The connection position of the exhaust bend 17 and the main exhaust duct 12 is higher than the connection position of the auxiliary exhaust duct 13 and the main exhaust duct 12.

[0059] Here, exhaust bend 17, exhaust hose 14, exhaust hose one 15, and exhaust hose two 16 are all made of high-temperature resistant telescopic ducts, which can be bent, deformed, and extended without affecting the vertical movement of the smoke exhaust pipe 2. Note that exhaust hoses 14, 15, and 16 will all have some bends during installation because the auxiliary exhaust pipe 13 is vertically misaligned with the smoke exhaust pipe 2, and the auxiliary exhaust pipe 13 is also somewhat misaligned with the main exhaust pipe 12.

[0060] The principle of this invention is as follows: During the movement of the steel strand 6 between the intermediate frequency furnace and the cooling water tank, an opening is made from left to right at the lower part of the exhaust pipe 2. The opening width of the exhaust pipe 2 is 9-10cm. If the opening width is 9cm or 10cm, the steel strand 6 can be wrapped inside the opening. The steel strand 6 is centrally arranged inside the exhaust pipe 2. The vertical distance between the lower opening of the exhaust pipe 2 and the steel strand 6 is 10-12cm. The vertical distance between the bottom opening of the silo 31 and the steel strand 6 is 16-20cm. The oil fumes released by the steel strand 6 during its movement after exiting the intermediate frequency furnace will not be dispersed outside the exhaust pipe 2, and the oil fumes generated by the intermediate frequency through the entire steel strand 6 are collected relatively cleanly.

[0061] To prevent smoke leakage from the induction furnace outlet, the smoke collection chamber 3 is rectangular in shape. The lower half of the smoke collection chamber 3 is the chamber body 31, and the upper half is the chamber cover 32. It can enclose the outlet of the induction furnace and prevent the oil fumes from escaping. The oil fumes generated at the outlet of the induction furnace account for more than 80% of the total oil fumes. The smoke collection chamber 3 is connected to the main exhaust pipe 12 via the exhaust bend 17, and the oil fumes are sucked away by the fan.

[0062] Since the main exhaust duct 12 is connected to the smoke exhaust duct 2 via the exhaust branch duct 27, which is located between the smoke collection pipe 4 and the smoke collection chamber 3, the residual oil fumes on the steel strand 6 are further removed through this exhaust branch duct 27. A 1.6m long smoke collection pipe 4 is installed in the middle of the smoke exhaust duct 2, and a 2.3m long smoke collection pipe 5 is installed at the end of the smoke exhaust duct 2. These pipes are connected to the main exhaust duct 12 via the exhaust hose 15, the exhaust hose 2 16, and the auxiliary exhaust duct 13, further collecting and discharging the residual oil fumes from the steel strand 6.

[0063] When the machine is started for production, the oil fume collection device is covered on the steel strand 6 that emits oil fumes using a winch 7. When the equipment stops for normal production, breaks the line, or an abnormality occurs that needs to be dealt with, the oil fume collection device is lifted up.

[0064] This invention relates to an oil fume collection device for a prestressed steel strand intermediate frequency furnace. Designed and manufactured according to the amount of oil fume emitted at each stage, it collects oil fumes in stages through different collection chambers 3, collection pipe one 4, and collection pipe two 5. The fumes are then sent to an oil fume purification system via a fan, effectively collecting and treating the oil fumes generated during the heat treatment of the steel strand 6 in the intermediate frequency furnace. The entire oil fume collection device is small in size, occupies little space, has a simple structure, low manufacturing cost, and excellent oil fume collection effect, effectively collecting all oil fumes. It can be raised and lowered during production, making it convenient and easy to use.

[0065] Example 2:

[0066] This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The differences are as follows: Figures 6-8As shown, the two sides of the opening of the exhaust pipe 2 bend inward to form grease baffles 18. Because the fumes are in contact with the inner wall of the exhaust pipe 2 for a long time, grease will form on the inner wall. The accumulated grease flows downward along the inner wall of the exhaust pipe 2 and flows out through the lower opening. This outflow is long and difficult to restrict. Therefore, by installing grease baffles 18 on both sides of the lower opening of the exhaust pipe 2, the grease is intercepted and guided, ensuring that the grease can only flow out through the end of the exhaust pipe 2.

[0067] Meanwhile, a cleaning mechanism is slidably connected inside the exhaust pipe 2 to clean the grease on the inner wall of the exhaust pipe 2. The cleaning mechanism includes a sliding frame 19 that slides outside the exhaust pipe 2 and a cleaning frame 20 that is located inside the exhaust pipe 2 and moves with the sliding frame 19. The sliding frame 19 includes a sliding plate 191 and a handheld frame 192. The sliding plate 191 has a C-shaped cross-section with its opening facing upwards and the opening of the exhaust pipe 2 facing downwards. The sliding plate 191 is fitted onto the outside of the exhaust pipe 2 and slides along the outside of the exhaust pipe 2.

[0068] Upper rollers 21 are provided on both sides of the upper part of the sliding plate 191, with two upper rollers 21 on each side. The two upper rollers 21 are arranged at intervals along the axial direction of the exhaust pipe 2, and the upper rollers 21 roll in contact with the outer wall of the exhaust pipe 2. At the same time, lower rollers 22 are provided on both sides of the lower part of the sliding plate 191. The lower rollers 22 on both sides are located in the lower opening of the exhaust pipe 2, with two lower rollers 22 on each side. The two lower rollers 22 are arranged at intervals along the axial direction of the exhaust pipe 2, and the lower rollers 22 roll in contact with the oil baffle plate 18.

[0069] Under the action of the upper roller 21 and the lower roller 22, the sliding plate 191 can slide smoothly along the exhaust pipe 2. Two handholds 192 are also provided at the lower part of the sliding plate 191. The handholds 192 are plates with a cross-section of "U". The two handholds 192 are arranged at intervals along the axial direction of the exhaust pipe 2. After the handholds 192 are connected and combined with the sliding plate 191, the cross-section is "U". The sliding plate 191 can be controlled to slide by operating the handholds 192.

[0070] The sliding frame 19 can move the cleaning frame 20 together. The cleaning frame 20 includes a cleaning top plate 201 and a cleaning support plate 202. The cleaning top plate 201 has a "C" shaped cross-section and an open bottom. The cleaning top plate 201 maintains an equidistant gap with the inner wall of the exhaust pipe 2. The cleaning support plates 202 are vertically installed at both ends of the cleaning top plate 201. The lower end of the cleaning support plate 202 is connected and fixed to the sliding plate 191. Three branches extend evenly from the upper end of the cleaning support plate 202, which are respectively connected and fixed to the cleaning top plate 201. The cleaning support plates 202 can be used to connect the cleaning top plate 201 and the sliding plate 191.

[0071] A spraying assembly is installed in the middle along the length of the cleaning frame 20, and brush plates 26 are installed on both sides. Both the spraying assembly and the brush plates 26 are located on the cleaning top plate 201. The spraying assembly abuts against the inner wall of the exhaust pipe 2. The spraying assembly includes a spraying pipe 23, a water supply pipe 24, and a sponge cover 25. The spraying pipe 23 is closed at both ends and is bent in a "C" shape around the cleaning top plate 201. The "C"-shaped opening of the spraying pipe 23 faces downward and is larger than the opening of the exhaust pipe 2. Several spraying holes 231 are opened on the spraying pipe 23. The water supply pipe 24 is connected to the middle of the spraying pipe 23 and passes vertically downward through the sliding frame 19. The sponge cover 25 is a sponge tube with a "C" shaped cross section. The "C" shaped cross section of the sponge cover 25 is used to hold the spray pipe 23 and cover the spray pipe 23. Furthermore, the sponge cover 25 is bent into a "C" shape to achieve full coverage of the spray pipe 23.

[0072] The bristles of the brush plate 26 abut against the inner wall of the exhaust pipe 2. The brush plate 26 is bent into a "C" shape around the cleaning top plate 201 and is arranged on the cleaning top plate 201. The "C"-shaped opening of the brush plate 26 faces downward and is larger than the opening of the exhaust pipe 2. Since both ends of the exhaust pipe 2 are open, the entire cleaning mechanism can enter and exit the exhaust pipe 2 from the ends of the exhaust pipe 2. When the cleaning mechanism is in use, the exhaust pipe 2 is first lifted upward, the steel strand 6 is detached from the exhaust pipe 2, and then the cleaning structure is inserted from the ends of the exhaust pipe 2. At this time, the sponge cover 25 abuts against the inner wall of the exhaust pipe 2 and deforms. The bristles on the brush plate 26 abut against the inner wall of the exhaust pipe 2 and also deform. The water supply pipe 24 is connected to the washing liquid pump pipe, and the washing liquid can be pumped into the spray pipe 23 through the water supply pipe 24.

[0073] During the manual operation of the sliding frame 19, which drives the cleaning frame 20 to move back and forth within the exhaust pipe 2, the washing liquid is sprayed through the spray hole 231 onto the sponge cover 25, wetting the sponge cover 25. The washing liquid is then transferred to the inner wall of the exhaust pipe 2, first decomposing the grease, and then removing the grease through the action of the bristles. This achieves the cleaning of grease inside the exhaust pipe 2 and improves the collection effect of oil fumes.

[0074] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A fume collection device for a medium-frequency furnace for prestressed steel strands, used for collecting and cleaning fume emitted from the steel strands (6) between the medium-frequency furnace and the cooling water tank, characterized in that, It includes a gantry (1), a smoke exhaust pipe (2), a smoke collection chamber (3), a smoke collection pipe one (4) and a smoke collection pipe two (5) with both ends closed, and a negative pressure exhaust system; The smoke exhaust pipe (2) is arranged to move up and down in the gantry (1). The cross-section of the smoke exhaust pipe (2) is "C"-shaped. The steel strand (6) between the intermediate frequency furnace and the cooling water tank passes through the smoke exhaust pipe (2). One end of the smoke exhaust pipe (2) is provided with the smoke collection chamber (3), and the smoke collection chamber (3) covers the periphery and above the outlet of the intermediate frequency furnace; The smoke collection pipe one (4) is arranged in the middle of the smoke exhaust pipe (2). The smoke collection pipe one (4) and the smoke exhaust pipe (2) are arranged parallel to each other vertically. The other end of the smoke exhaust pipe (2) is provided with the smoke collection pipe two (5). The smoke collection pipe two (5) has the same structure as the smoke collection pipe one (4). The smoke collection pipe one (4) and the smoke collection pipe two (5) are arranged coaxially. One end of the smoke collection pipe two (5) extends out of the end of the smoke exhaust pipe (2); Narrow slit-shaped air inlets (11) are opened at the bottoms of the smoke collection pipe one (4) and the smoke collection pipe two (5) for connecting with the smoke exhaust pipe (2). A negative pressure exhaust system is arranged at the upper part of the gantry (1), and the negative pressure exhaust system is respectively connected with the smoke collection chamber (3), the smoke collection pipe one (4) and the smoke collection pipe two (5).

2. The fume collection device for a medium-frequency furnace of prestressed steel strand according to claim 1, characterized in that, The gantry (1) is a portal-shaped steel structure frame welded by profiles. The gantry (1) is arranged between the intermediate frequency furnace and the cooling water tank. At least two hoists (7) are arranged on the gantry (1). The hoists (7) correspond to the ends of the smoke exhaust pipe (2), and the steel wires of the hoists (7) hook the smoke exhaust pipe (2) downward.

3. The oil fume collection device for a medium-frequency furnace of prestressed steel strand according to claim 2, characterized in that, The length of the smoke exhaust pipe (2) is greater than the length of the gantry (1). At least two guiding components are further arranged between the smoke exhaust pipe (2) and the gantry (1) for guiding the vertical up and down movement of the smoke exhaust pipe (2). A plurality of tension springs (9) are also arranged between the smoke exhaust pipe (2) and the gantry (1) for hooking the smoke exhaust pipe (2), and the tension springs (9) are arranged side by side with the guiding components.

4. The oil fume collection device for a medium-frequency furnace of prestressed steel strand according to claim 3, characterized in that, Each guiding component includes a fixed sleeve (81) and a sliding rod (82). The fixed sleeve (81) is fixedly connected with the gantry (1) upward, and the sliding rod (82) is fixedly connected with the smoke exhaust pipe (2) downward. The upper end of the sliding rod (82) extends into the fixed sleeve (81) and slides up and down along the fixed sleeve (81).

5. A fume collection device for a medium-frequency furnace for prestressed steel strand according to claim 1, characterized in that, The smoke exhaust pipe (2) is horizontally arranged with both ends open, and the smoke exhaust pipe (2) wraps the steel strand (6). The smoke collection chamber (3) includes a chamber body (31) and a chamber cover (32). The chamber body (31) is bent into a "U" shape and surrounds the periphery of the outlet of the intermediate frequency furnace. The chamber cover (32) is arranged above the chamber body (31), and the chamber cover (32) covers above the outlet of the intermediate frequency furnace.

6. The fume collection device for a medium-frequency furnace of prestressed steel strand according to claim 1, characterized in that, The diameter of the smoke collection pipe one (4) is greater than that of the smoke exhaust pipe (2). The smoke collection pipe one (4) is vertically connected with the smoke exhaust pipe (2) through the air inlet (11). The length of the smoke collection pipe two (5) is greater than that of the smoke collection pipe one (4). The smoke collection pipe two (5) is also vertically connected with the smoke exhaust pipe (2) through the air inlet (11).

7. A fume collection device for a medium-frequency furnace for prestressed steel strand according to claim 1, characterized in that, The negative pressure exhaust system includes a main exhaust duct (12) connected to a ventilation fan, an auxiliary exhaust duct (13) and an exhaust hose (14). The main exhaust duct (12) is installed on the gantry (1) and one end of the main exhaust duct (12) is bent vertically downward. The exhaust pipe (2) between the smoke collection pipe (4) and the smoke collection chamber (3) is connected to an exhaust branch pipe (27). The exhaust branch pipe (27) extends upward into the main exhaust pipe (12) and is connected to the main exhaust pipe (12). The exhaust branch pipe (27) slides up and down along the main exhaust pipe (12).

8. A fume collection device for a medium-frequency furnace for prestressed steel strand according to claim 7, characterized in that, The auxiliary exhaust duct (13) is installed on the gantry (1). The auxiliary exhaust duct (13) is connected to the main exhaust duct (12) through the exhaust hose (14). The auxiliary exhaust duct (13) and the smoke exhaust duct (2) are arranged in parallel with each other at intervals. The auxiliary exhaust pipe (13) is connected to the smoke collection pipe (4) by an exhaust hose (15), the auxiliary exhaust pipe (13) is connected to the smoke collection pipe (5) by an exhaust hose (16), and the main exhaust pipe (12) is connected to the smoke collection chamber (3) by an exhaust bend (17).

9. A fume collection device for a medium-frequency furnace for prestressed steel strand according to claim 1, characterized in that, The lower opening of the exhaust pipe (2) forms a "C" shaped cross section. The width of the exhaust pipe (2) opening is greater than the width of the air vent (11). The two sides of the exhaust pipe (2) opening bend inward to form an oil baffle (18). A cleaning mechanism is slidably connected inside the exhaust pipe (2). The cleaning mechanism includes a sliding frame (19) slidably connected to the outside of the exhaust pipe (2) and a cleaning frame (20) set inside the exhaust pipe (2) and moving with the sliding frame (19). A spraying component is provided in the middle of the cleaning frame (20) and brush plates (26) are provided on both sides. The spraying component and brush plates (26) abut against the inner wall of the exhaust pipe (2).

10. A fume collection device for a medium-frequency furnace for prestressed steel strand according to claim 9, characterized in that, The width of the lower opening of the exhaust pipe (2) is 9-10cm.

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