A billet descaling and dust removing device

Abstract

The utility model provides a kind of billet descaling dust removal device, it is set between the outlet of heating furnace and first frame rolling mill, including rack, be provided on the rack for conveying billet's roller conveyor, rack is also provided with the protective cover of U type, the two sides of protective cover are respectively provided with inlet and outlet, be provided with the first spray material cover and the second spray material cover of U type on protective cover, the inside of the side wall of first spray material cover is provided with cooling cavity, the inside wall on the upper end, left end and right end of first spray material cover is also provided with multiple atomizing water spray nozzles being connected with cooling cavity, the inside of the side wall of second spray material cover is provided with purge cavity, the inside wall on the upper end, left end and right end of second spray material cover is provided with multiple gas jet nozzles being connected with purge cavity.The billet descaling dust removal device described in the utility model, by the synergistic effect of low-pressure water atomization cooling combined with gas purging, efficient descaling and dust removal are realized, and the operating cost is significantly reduced and the hot rolling environment is improved.

Description

Technical Field

[0001] This utility model belongs to the field of steel billet processing technology, and specifically relates to a steel billet descaling and dust removal device. Background Technology

[0002] In the hot rolling process, if the iron oxide scale adhering to the surface of the steel billet after exiting the heating furnace is not effectively removed, it will break and generate dust pollution during subsequent rolling. Additionally, some particles may be pressed into the steel workpiece, affecting surface quality. Traditional processes use high-pressure water (≥20MPa) for direct descaling, which is highly effective, but suffers from high energy consumption in high-pressure water preparation, significant operating costs and equipment investment. Furthermore, it leads to higher particulate matter content in the rolling mill area, impacting the production environment and worker safety and health. Additionally, high-pressure water jetting may cause excessive localized cooling of the steel billet, affecting the stability of subsequent rolling processes.

[0003] Therefore, there is an urgent need for a low-energy, low-cost, and environmentally friendly alternative solution for dust and scale removal. Utility Model Content

[0004] In view of this, this utility model addresses the shortcomings of the prior art by providing a billet descaling and dust removal device. Through the synergistic effect of low-pressure water atomization cooling combined with gas purging, it achieves efficient descaling and dust removal, significantly reducing operating costs and improving the hot rolling environment.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a billet descaling and dust removal device, which is set between the outlet of the heating furnace and the first rolling mill, includes a frame, a roller conveyor for conveying steel billets is set on the frame, and a U-shaped protective cover is also set on the frame. The protective cover has an inlet and an outlet on both sides respectively. The protective cover has a U-shaped first spray cover and a second spray cover. The side wall of the first spray cover has a cooling chamber. The inner side wall of the upper, left and right ends of the first spray cover is also provided with a plurality of atomizing water nozzles connected to the cooling chamber. The side wall of the second spray cover has a purging chamber. The inner side wall of the upper, left and right ends of the second spray cover is provided with a plurality of air jet nozzles connected to the purging chamber.

[0006] As a further improvement of this utility model, a hot metal monitor is also provided on one side of the feed inlet of the protective cover, a water inlet pipe is provided on the first spray cover, a first control valve is provided on the water inlet pipe, an air inlet pipe is provided on the second spray cover, a second control valve is provided on the air inlet pipe, and both the first control valve and the second control valve are electrically connected to the hot metal monitor.

[0007] As a further improvement of this utility model, a trench is also provided on the ground below the roller conveyor for collecting iron oxide scale. A material collection screen trough with its lower end submerged in water can also be detachably provided on the side end of the trench.

[0008] As a further improvement of this utility model, the material collection screen trough and the trench groove are connected by a locking plate on the side end of the material collection screen trough, and a handle is provided on the locking plate.

[0009] As a further improvement of this utility model, a discharge pipe is also provided at the side end of the trench, and a pump body and a discharge valve are provided on the discharge pipe.

[0010] As a further improvement of this utility model, the pressure of the atomized water sprayed from the atomizing nozzle is 0.4-0.6MPa, and the pressure of the gas sprayed from the jet nozzle is ≥0.2MPa.

[0011] As a further improvement of this utility model, a first anti-splash chain curtain is provided at the inlet of the protective cover, and a second anti-splash chain curtain is provided at the outlet of the protective cover.

[0012] As a further improvement of this utility model, a noise-reducing layer is also provided on the outer wall of the protective cover, and a support leg is also provided at the bottom of the frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: Firstly, this solution uses atomized water at 0.4-0.6 MPa and gas at no less than 0.2 MPa for descaling and dust removal, which significantly reduces energy consumption compared to traditional high-pressure water descaling processes (which typically require pressures above 20 MPa). Secondly, the use of a low-pressure system results in less equipment wear, significantly reducing maintenance frequency and spare parts replacement rates, thereby lowering long-term operating costs. Thirdly, this technical solution can replace traditional high-pressure water descaling processes, not only reducing investment in high-pressure pump stations but also avoiding the high energy consumption and maintenance costs associated with high-pressure water systems.

[0014] Secondly, through the synergistic effect of water mist cooling and gas purging, the billet is efficiently descaled before rolling, which fundamentally reduces the dust generated by the breakage of iron oxide scale during rolling, reduces the burden on the subsequent dust removal system, and achieves energy saving and consumption reduction.

[0015] Thirdly, through efficient dust removal and splash prevention designs (such as protective covers, chain curtains, and material collection screens), the splashing of iron oxide scale and the dust content in the air are reduced, which helps to improve the workshop environment and enhance air quality.

[0016] Fourth, the protective cover is equipped with noise-reducing materials, effectively reducing noise generated during gas purging, improving the working environment for workers, and meeting occupational health and safety standards. The hot metal monitor is linked to the electric valve to achieve automated control, activating the water and air spray systems only when the billet passes through, avoiding resource waste and improving system response efficiency. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the first spray nozzle, the second spray nozzle, the atomizing water nozzle, and the air nozzle of this utility model. Figure 3 This is a schematic diagram of the structure of the trench, material collection screen, baffle, discharge pipe, pump body, discharge valve and handle of this utility model.

[0019] In the diagram: 101, frame; 102, roller conveyor; 103, protective cover; 104, feed inlet; 105, discharge outlet; 106, first spray hood; 107, second spray hood; 108, atomizing water nozzle; 109, air nozzle; 201, hot metal detector; 202, water inlet pipe; 203, first control valve; 204, air inlet pipe; 205, second control valve; 206, first splash-proof chain curtain; 207, second splash-proof chain curtain; 208, noise reduction layer; 209, support leg; 301, trench; 302, material collection screen trough; 303, baffle plate; 304, discharge pipe; 305, pump body; 306, discharge valve; 307, handle. Detailed Implementation

[0020] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.

[0021] like Figure 1 , 2As shown, a billet descaling and dust removal device is installed between the outlet of the heating furnace and the first rolling mill. It includes a frame 101, on which a roller conveyor 102 for conveying billets is installed. A U-shaped protective cover 103 is also installed on the frame 101. A feed inlet 104 and a discharge outlet 105 are respectively provided on both sides of the protective cover 103. A U-shaped first spray cover 106 and a second spray cover 107 are provided on the protective cover 103. A cooling chamber is provided inside the side wall of the first spray cover 106. Multiple atomizing water nozzles 108 connected to the cooling chamber are also provided on the inner side walls of the upper, left and right ends of the first spray cover 106. A purging chamber is provided inside the side wall of the second spray cover 107. Multiple air nozzles 109 connected to the purging chamber are provided on the inner side walls of the upper, left and right ends of the second spray cover 107. The pressure of the atomized water sprayed by the atomizing nozzle 108 is 0.4-0.6 MPa, and the pressure of the gas sprayed by the air nozzle 109 is ≥0.2 MPa.

[0022] like Figure 1 , 2 As shown, a hot metal monitor 201 is also provided on one side of the feed inlet 104 of the protective cover 103. A water inlet pipe 202 is provided on the first spray cover 106, and a first control valve 203 is provided on the water inlet pipe 202. An air inlet pipe 204 is provided on the second spray cover 107, and a second control valve 205 is provided on the air inlet pipe 204. The first control valve 203 and the second control valve 205 are both electrically connected to the hot metal monitor 201.

[0023] The steel billet exiting the heating furnace enters the roller conveyor 102 for transport. After the hot metal monitor 201 detects that the head of the steel billet has entered the protective cover 103, it will automatically open the first control valve 203 (controlling atomized water) and the second control valve 205 (controlling purging gas) in sequence through a delay mechanism to ensure that the system is in working condition when the steel billet reaches the spraying area. After the steel billet runs to the position corresponding to the first spraying cover 106, the first control valve 203 opens, and the water flows into the cooling chamber in the first spraying cover 106 through the water inlet pipe 202, and sprays atomized water through multiple atomizing water nozzles 108 on the inner side walls of the upper, left and right ends of the first spraying cover 106 (the sprayed atomized water pressure is 0.4-0.6MPa, which is much lower than the 20MPa required for traditional high-pressure water descaling). When atomized water is sprayed onto the surface of a high-temperature steel billet, the iron oxide scale rapidly cools and shrinks, separating from the billet substrate. The iron oxide scale breaks into small pieces, facilitating subsequent gas purging and removal. It also plays a role in dust removal, reducing dust dispersion.

[0024] When the billet reaches the position corresponding to the second spray hood 107, the second control valve 205 opens, and high-pressure gas enters the purging chamber in the second spray hood 107 through the air inlet pipe 204. High-pressure gas (gas injection pressure ≥ 0.2 MPa, used to purge broken iron oxide scale) is then ejected through multiple nozzles 109 on the inner walls of the upper, left, and right ends of the second spray hood 107, blowing the broken iron oxide scale away from the billet surface. Furthermore, through the cooperation of the first spray hood 106, the cooling chamber, and multiple atomizing water nozzles 108, the dust generated during rolling due to broken iron oxide scale is significantly reduced, meeting the requirements for dephosphorization and dust removal of the billet and reducing the burden on subsequent dust removal systems. Afterward, the billet enters the first rolling mill for further processing.

[0025] After a period of time, the steel leaves the discharge port 105 of the roller conveyor 102. The delay mechanism will automatically close the first control valve 203 and the second control valve 205 in sequence to ensure that the spraying and purging process is completely synchronized with the movement of the billet. The water spraying and air spraying system is only activated when the billet passes through to avoid waste of resources.

[0026] This device is suitable for use before the billet removal device between the heating furnace outlet and the first rolling mill stand, and is especially suitable for steel production enterprises with high requirements for energy consumption, environmental protection, and occupational health. The installation location must ensure that it does not obstruct furnace opening operations and billet removal operations.

[0027] According to another embodiment of the present invention, such as Figure 3 As shown, a trench 301 is also provided on the ground below the roller conveyor 102 for collecting iron oxide scale. A material collection screen 302 with its lower end submerged in water can also be detachably provided in the side end of the trench 301.

[0028] The sheet metal that falls off the billet will pass through the gap of the roller conveyor 102 and fall into the collection screen 302 of the trench 301. It will be lowered by the water in the trench 301 and collected by the collection screen 302.

[0029] According to another embodiment of the present invention, such as Figure 3As shown, the collecting screen trough 302 and the trench 301 are connected by a locking groove. A locking baffle 303 is provided on the side end of the collecting screen trough 302 to engage with the trench 301, and a handle 307 is provided on the locking baffle 303. Simply placing the collecting screen trough 302 into the trench 301 allows for flexible fixing of the collecting screen trough 302 and the trench 301 using the locking action of the locking baffle 303. The handle 307 allows for easy movement of the collecting screen trough 302, facilitating the locking and fixing of the collecting screen trough 302 and the removal of iron sheets from the collecting screen trough 302. After a period of time, once enough iron sheets have collected in the collecting screen trough 302, it can be removed from the trench 301 to clean the collected iron sheets.

[0030] According to another embodiment of the present invention, such as Figure 3 As shown, a discharge pipe 304 is also provided at the side end of the trench 301, and a pump body 305 and a discharge valve 306 are provided on the discharge pipe 304. The user only needs to open the discharge valve 306 to discharge the sewage in the trench 301 through the discharge pipe 304.

[0031] According to another embodiment of the present invention, such as Figure 2 As shown, a first anti-splash chain curtain 206 is also provided at the feed inlet 104 of the protective cover 103, and a second anti-splash chain curtain 207 is also provided at the discharge outlet 105 of the protective cover 103. The provision of the first anti-splash chain curtain 206 and the second anti-splash chain curtain 207 at the feed inlet 104 and discharge outlet 105 of the protective cover 103 not only does not affect the feeding and discharging of steel, but also prevents iron oxide scale from splashing during the spraying process.

[0032] According to another embodiment of the present invention, such as Figure 1 As shown, a noise-reducing layer 208 is also provided on the outer wall of the protective cover 103. The noise-reducing layer 208 is made of double-layer aluminum honeycomb panel, and a support leg 209 is also provided at the bottom of the frame 101. The noise-reducing layer 208, made of double-layer aluminum honeycomb panel, has good sound insulation effect and can effectively reduce the noise generated during gas purging, thus improving the working environment for workers.

[0033] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A billet descaling and dust removal device, installed between the outlet of the heating furnace and the first rolling mill stand, characterized in that: The system includes a frame (101), on which a roller conveyor (102) for conveying steel billets is installed. A U-shaped protective cover (103) is also installed on the frame (101). An inlet (104) and an outlet (105) are respectively provided on both sides of the protective cover (103). A U-shaped first spray cover (106) and a second spray cover (107) are provided on the protective cover (103). A cooling chamber is provided inside the side wall of the first spray cover (106). Multiple atomizing water nozzles (108) connected to the cooling chamber are also provided on the inner side walls of the upper, left and right ends of the first spray cover (106). A purging chamber is provided inside the side wall of the second spray cover (107). Multiple air nozzles (109) connected to the purging chamber are provided on the inner side walls of the upper, left and right ends of the second spray cover (107).

2. The billet descaling and dust removal device as described in claim 1, characterized in that: A hot metal monitor (201) is also provided on one side of the feed inlet (104) of the protective cover (103). A water inlet pipe (202) is provided on the first spray cover (106), and a first control valve (203) is provided on the water inlet pipe (202). An air inlet pipe (204) is provided on the second spray cover (107), and a second control valve (205) is provided on the air inlet pipe (204). The first control valve (203) and the second control valve (205) are both electrically connected to the hot metal monitor (201).

3. The billet descaling and dust removal device as described in claim 2, characterized in that: A ground trench (301) is also provided on the ground below the roller conveyor (102) for collecting iron oxide scale. A material collection screen (302) with its lower end submerged in the water in the trench (301) can also be detachably provided on the side end of the trench (301).

4. The billet descaling and dust removal device as described in claim 3, characterized in that: The aggregate screen trough (302) and the trench (301) are connected by a slot. The side end of the aggregate screen trough (302) is provided with a baffle (303) that engages with the trench (301). The baffle (303) is provided with a handle (307).

5. The billet descaling and dust removal device as described in claim 4, characterized in that: The side end of the trench (301) is also provided with a discharge pipe (304), and a pump body (305) and a discharge valve (306) are provided on the discharge pipe (304).

6. The billet descaling and dust removal device as described in claim 5, characterized in that: The pressure of the atomized water sprayed by the atomizing nozzle (108) is 0.4-0.6 MPa, and the pressure of the gas sprayed by the jet nozzle (109) is ≥0.2 MPa.

7. The billet descaling and dust removal device as described in claim 6, characterized in that: The inlet (104) of the protective cover (103) is also provided with a first splash-proof chain curtain (206), and the outlet (105) of the protective cover (103) is also provided with a second splash-proof chain curtain (207).

8. The billet descaling and dust removal device as described in claim 7, characterized in that: The outer wall of the protective cover (103) is also provided with a noise-proof layer (208), and the bottom of the frame (101) is also provided with a support leg (209).

Images