Novel hot-rolled rod and wire oxide scale collecting device and method

Abstract

The invention discloses a novel hot-rolled rod and wire oxide scale collecting device and method. Which comprises a hot-rolled rod and wire conveying roller way, and is characterized in that a chain plate type conveyor is arranged below the roller way; a slag collecting hopper is arranged at the tail part of the chain plate type conveyor; and an iron sheet slag collecting box is arranged below the slag collecting hopper. According to the method, the oxide scale does not need to be flushed into the rotational flow well or the primary sedimentation tank by using additional slag flushing water and slag flushing runner and then is collected by using a grab bucket type travelling crane, so that energy conservation and emission reduction are realized. Meanwhile, the design of a slag sluice of a furnace discharging table and a slag sluice of a roughing mill unit area is omitted, only the slag sluice with small gradient and depth in the area from an intermediate mill unit to a finishing mill unit is reserved, and a large amount of cooling water doped with only a small amount of oxide scale powder can be recycled.

Description

Technical Field

[0001] The invention relates to the field of hot-rolled bar and wire production, and in particular to a novel device and method for collecting iron oxide scale of hot-rolled bar and wire. Background Art

[0002] In the production process of hot-rolled bars, wires, and strips, there must be iron oxide scale produced by high-temperature oxidation on the surface of the rolled pieces. In particular, the surface of the steel billet just sent out from the heating furnace is covered with a large amount of loose primary iron oxide scale in the form of flakes. The primary iron oxide scale on the surface of the steel billet will naturally fall off on the conveying roller behind the furnace due to roller rolling, vibration, temperature drop shrinkage, etc., and will also be forcibly stripped off by the dephosphorization device installed on the roller. For this reason, the rollers, rolling mills, and other equipment along the rolling center line of the hot rolling production line are equipped with slag flushing grooves and slag flushing water pipelines directly below. There is also a cyclone pool or a sedimentation tank outside the main plant to collect the iron oxide scale and cooling water (turbid ring water) that falls from the entire line, and finally realize the recycling of iron oxide scale and water. A large grab bridge crane and an iron oxide scale dehydration slag pit are also required next to the cyclone pool or a sedimentation tank to regularly grab the iron oxide scale at the bottom of the pool and drain it in the dehydration slag pit.

[0003] In addition, in order to ensure that the iron oxide scale falling into the slag ditch can be completely collected into the cyclone tank or the first settling tank, two to three water pumps are set in the cyclone tank or the first settling tank to continuously provide slag flushing water (turbid ring water) for the rolling line slag ditch. The metal loss caused by the primary iron oxide scale is much greater than the iron oxide scale produced in the subsequent hot rolling process. Therefore, the primary iron oxide scale is the main iron oxide scale in the slag flushing ditch, and the iron oxide scale produced in other stages accounts for only a small part. The slag flushing water only needs to be supplied to the area with more primary iron oxide scale, and the corresponding slag flushing points are mainly concentrated at the entrance of the heating furnace roller table, the entrance of the rough rolling unit, and the slag ditch converging mouth.

[0004] However, in order to collect iron slag mainly composed of primary iron oxide, the collection form of slag ditch and cyclone pool or one settling tank uniformly adopted in the industry always has the problem of large initial investment and high operation and maintenance costs. First of all, in order to ensure that the iron oxide can smoothly converge to the cyclone pool or one settling tank in the slag ditch, the slag ditch set along the rolling center line needs to be constructed with a certain slope. This makes the depth of the final convergence point - the cyclone pool or one settling tank very deep, generally about ten meters. In addition, in order to improve the wear resistance of the slag ditch, it is necessary to cast it with iron steel sand wear-resistant materials; for daily cleaning and regular repair of the slag ditch, it is also necessary to build pedestrian walkways, railings and lighting on one side of the slag ditch. This greatly increases the initial investment cost of the production line, and the construction period is bound to be greatly extended. In fact, since the cooling water collected in the slag ditch still maintains a certain temperature, a large amount of water mist makes the environment of the slag ditch maintenance channel very harsh, which not only poses a certain risk to personnel safety, but also accelerates the corrosion of the pipelines in the slag ditch maintenance channel, further increasing the maintenance cost of the production line. Secondly, multiple water pumps installed next to the cyclone tank or the first settling tank continuously supply slag flushing water to the slag flushing ditch, which makes the water system of the production line increase by nearly 10% of the water volume, which will inevitably increase the construction scale of the cyclone tank or the first settling tank, water treatment facilities (including chemical oil removal, sludge tank, concentration tank, cooling tower, cold water tank, circulating water pump room, pipeline, etc.), and significantly increase the one-time investment, operation cost and maintenance cost of public auxiliary facilities. Finally, although the slag flushing ditch has a certain slope and the slag flushing water is continuously flushing, the slag ditch may still be blocked by oxidized iron sheets, and on-site personnel need to clear it at a fixed point.

[0005] In summary, the existing traditional collection methods of iron oxide scale have many problems and shortcomings, and no effective system solution has been announced so far. Moreover, the current steel industry has serious overcapacity, serious product homogeneity, and low profit margins. Steel companies still need to reduce all production costs that can be reduced as much as possible. Therefore, a new type of hot-rolled bar and wire iron oxide scale collection device and control method that saves production costs, is easy to operate, and is feasible is proposed, which has great social and economic benefits and has great prospects for promotion and application. Summary of the invention

[0006] In view of the above problems, the present invention provides a novel device and method for collecting iron oxide scale of hot-rolled bars and wires which is cost-saving, easy to operate and feasible.

[0007] To achieve the above-mentioned purpose, the novel hot-rolled bar and wire iron oxide scale collecting device of the present invention comprises a slag drop opening arranged below the roller table, and a chain plate conveyor is arranged below the slag drop opening;

[0008] A slag collecting bucket is arranged at the tail of the chain plate conveyor;

[0009] A sheet iron slag collecting box is arranged below the slag collecting hopper.

[0010] Furthermore, a slag dropping opening is arranged below the roller conveyor, and the chain plate conveyor is arranged below the slag dropping opening.

[0011] Furthermore, a slag trough is provided below the roller, and the slag trough is provided with an inclined section; a spiral iron sheet slag-water separator is provided in the inclined section of the slag trough.

[0012] Furthermore, the discharging end of the chain plate conveyor and the discharging end of the screw elevator are arranged adjacent to each other;

[0013] The slag collecting bucket is arranged below the discharge end of the chain plate conveyor and the discharge end of the spiral elevator.

[0014] Furthermore, a suspension frame is provided at the slag drop port, and the chain plate conveyor is installed on the suspension frame.

[0015] Furthermore, a floor-mounted mounting frame is provided at the slag drop port, and the chain plate conveyor is installed on the floor-mounted mounting frame.

[0016] Furthermore, the hot-rolled rod and wire transport roller table includes: a rear roller table and a rough rolling unit.

[0017] To achieve the above object, the novel method for collecting oxide scale of hot-rolled bars and wires of the present invention comprises the following steps:

[0018] After the billet comes out of the heating furnace, it is transported to the rough rolling mill by the roller table behind the furnace. During transportation, the hot iron oxide scale that falls off the surface of the billet falls directly onto the chain of the suspended chain conveyor;

[0019] The driving motor of the suspended chain conveyor can rotate continuously or intermittently to send the fallen oxidized iron sheets into the slag collecting bucket, and finally into the iron sheet slag collecting box;

[0020] From the time when the head of the billet enters the rough rolling unit to the time when the tail is completely bitten by the first rolling mill of the rough rolling unit, the iron oxide scale that falls off the rolled piece will be washed into the slag outlet of the elevated platform by the roller cooling water, and finally enter the spiral iron scale slag-water separator through the cooling water collection guide groove, and the spiral iron scale slag-water separator will send the separated iron oxide scale into the openable slag hopper and iron scale slag collection box;

[0021] When a tin slag collection box is full, close the slag hopper opening;

[0022] After the replacement empty iron slag collection box is in place, open the slag hopper immediately.

[0023] In summary, such a cycle can collect more than 90% of the scale oxide in the hot rolling production line in advance, without the need to use additional slag flushing water and slag flushing ditch to flush the scale oxide into the vortex well or a sedimentation tank, and then collect it with a grab crane, thus achieving energy conservation and emission reduction. At the same time, the slag flushing ditch design of the furnace roller and the rough rolling unit area is omitted, and only the slag ditch with a small slope and depth from the intermediate rolling unit to the finishing unit is retained to recycle a large amount of cooling water mixed with only a small amount of scale oxide powder. In fact, the elimination of the slag flushing ditch in the rear conveyor roller and rough rolling unit area where the scale oxide is mainly concentrated greatly reduces the depth and size of the vortex well or a sedimentation tank, reduces the scale of the production line turbid water treatment facilities, reduces the working frequency of the grab crane, improves the recovery rate and efficiency of the scale oxide, and effectively reduces the one-time investment cost and operating cost of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Traditional slag ditch layout (top view projection).

[0025] Figure 2 for Figure 1 Cross-sectional view of .

[0026] Figure 3 This is a cross-sectional view of a traditional slag ditch.

[0027] Figure 4 This is a cross-sectional view of the iron oxide scale collecting device and the slag outlet of Example 1 of the present invention.

[0028] Figure 5 for Figure 4 A schematic structural diagram of a suspended chain conveyor in the illustrated embodiment.

[0029] Figure 6 for Figure 4 Installation cross-sectional view of the suspended chain conveyor in the illustrated embodiment.

[0030] Figure 7 for Figure 4 A cross-sectional view of a suspended chain conveyor in the illustrated embodiment

[0031] Figure 8 for Figure 4 A schematic structural diagram of a spiral iron sheet slag-water separator in the illustrated embodiment.

[0032] Fig. 9 for Figure 4 Schematic diagram of the iron oxide slag collecting bucket and iron oxide slag collecting box device in the illustrated embodiment.

[0033] Fig.10 It is a top view (no high-pressure water descaling on the furnace roller table) and a cross-sectional view of the iron oxide scale collecting device and the slag ditch of Example 2 of the present invention.

[0034] Fig.11 It is a top view (high-pressure water descaling is provided on the furnace roller table) and a cross-sectional view of the iron oxide scale collecting device and the slag outlet of Example 3 of the present invention.

[0035] Fig.12 This is a cross-sectional view of an oxide scale collecting device and a slag outlet proposed for a floor-type production line according to Example 4 of the present invention.

[0036] Fig.13 Floor-standing chain conveyor of the present invention

[0037] Fig.14 The oxidized iron scale collection device and the cross-sectional view of the slag outlet of the floor-type production line of Example 5

[0038] Fig.15 The layout diagram of the iron oxide scale collection device of the floor-type production line of Example 5 is shown. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The novel hot-rolled rod and wire iron oxide scale collecting device of the present invention comprises a suspended chain plate conveyor (or a floor-standing chain plate conveyor), a spiral iron scale slag-water separator, an openable and closable slag collecting hopper, and an iron scale slag collecting box.

[0044] The suspended chain conveyor is mainly used to transport the oxidized iron scale that falls directly under the hot delivery roller of the elevated platform type rod and wire production line to a unified collection location, and mainly includes a conveyor drive mechanism (drive motor), a drive sprocket, a driven sprocket, a chain rail, a chain plate, a tensioning mechanism, and a steel structure. The suspended chain conveyor can be extended according to the length of the elevated platform directly under the hot delivery roller to achieve full coverage and collection of the oxidized iron scale that falls under the roller. For the elevated platform type rod and wire production line, the suspended chain conveyor occupies less space and basically retains all pedestrian passages and material storage space under the platform.

[0045] It is mainly used to transport the oxidized iron scale that falls directly below the hot delivery roller of the elevated platform type bar and wire production line to a unified collection location, and mainly includes a conveyor drive mechanism (drive motor), a drive sprocket, a driven sprocket, a chain rail, a chain plate, a tensioning mechanism, and a steel structure. The conveyor drive mechanism mainly includes a motor and a reducer, which is mainly used to drive the drive sprocket, thereby driving the chain plate to rotate around the drive sprocket, the driven sprocket and the chain rail, thereby realizing the transportation of the oxidized iron scale.

[0046] The driving sprocket is mainly directly connected to the conveyor driving motor to transmit power to the chain plate to realize the rotation and steering movement of the chain plate, that is, to rotate in the running direction of the steel billet.

[0047] The driven sprocket is located at the end of the suspended chain conveyor in the direction of transporting oxidized iron sheets, realizing the rotary and turning movement of the chain, that is, the chain rotates in the opposite direction of the billet movement, thereby realizing the periodic rotation of the chain.

[0048] The chain rail is used to connect the driving sprocket and the driven sprocket so that the roller of the chain plate can keep running in the rail groove after leaving the sprocket, thereby realizing stable unidirectional movement of the chain plate.

[0049] The chain plates are metal roller chain plates with metal baffles on both sides, which are used to receive all the oxidized iron sheets falling from the slag outlet of the elevated platform under the roller table, and transport all the oxidized iron sheets to a special collection point through unidirectional rotary periodic motion. In order to ensure that the oxidized iron sheets will not fall from the sides of the conveyor or between the chain plates to the floor, a certain amount of overlap can be retained between adjacent chain plates to eliminate the gap between the chain plates.

[0050] The tensioning mechanism is a mechanism used to adjust the tightness of the chain plate and to disassemble, assemble and maintain the chain plate.

[0051] The steel structure is a steel structure that supports the entire chain plate frame and also includes steel structure legs and steel plates that are hung and fixed to the bottom of the elevated platform.

[0052] The basic structure of the floor-type chain conveyor is the same as that of the suspended chain conveyor, except that the steel structure used to support the entire chain frame is oriented in the opposite direction to that of the suspended chain conveyor. Therefore, the supporting steel structure of the floor-type chain conveyor is oriented toward the ground, so that the chain conveyor can be directly installed on the ground, and the surface of the chain receives the iron oxide falling from above.

[0053] The spiral iron scale slag-water separator is mainly used in the elevated platform type bar and wire production line, and is a device for collecting and processing the cooling water containing oxidized iron scale under the platform of the roller high-pressure water descaling area behind the furnace and the platform of the rough rolling unit area. The spiral iron scale slag-water separator is mainly used to separate the oxidized iron scale from the cooling water, collect and transport the oxidized iron scale to a unified collection location, and at the same time send the remaining cooling water to the nearest slag flushing ditch or drainage point for recycling.

[0054] The spiral iron sheet slag-water separator mainly includes a separator drive mechanism, a main shaft, spiral blades, a tank body, a cooling water collecting trough containing oxidized iron sheet, an iron sheet slag outlet, an overflow weir, an overflow pipe, and a steel structure support.

[0055] The separator driving mechanism includes a motor and a reducer, which mainly drives the spiral blades on the main shaft to rotate, thereby realizing a mechanism in which the oxidized iron scale is separated from the cooling water by the spiral motion of the spiral blades.

[0056] The main shaft transmits the power of the separator driving motor and is also the installation position of the spiral blade.

[0057] The spiral blade is a blade spirally mounted on the main shaft. The spiral movement of the blade separates the oxidized iron sheet slag from the cooling water and pushes it to the iron sheet slag outlet.

[0058] The trough body is a circular arc trough body with a bottom adapted to the spiral blades, an opening at the top, and is tilted at a certain angle. The tilt angle is generally between 0° and 14°. The opening at the top of the trough body is for the purpose of conveniently receiving cooling water containing oxidized iron scale flowing down from the cooling water collection guide trough. In addition, at the low point side of the tilt of the trough body, the side plate of the trough body is in the form of a horizontal weir plate, so that the trough body can accommodate more cooling water, which is also conducive to the full precipitation and separation of oxidized iron scale slag.

[0059] The cooling water collecting channel is installed under the platform of the roller high-pressure water descaling area behind the furnace or the platform of the rough rolling mill. The cooling water and the mixed iron oxide slag will flow into the funnel-shaped guide channel and finally flow into the tank body of the spiral iron oxide slag-water separator.

[0060] The overflow weir is an overflow trough set at the end of the inclined low point of the trough body, which can allow the clean cooling water in the upper part of the trough body to overflow and flow back to the nearest slag flushing ditch or drainage point through the overflow pipe. In this way, the trough body can continuously accommodate the newly flowing cooling water, so that the spiral iron sheet slag-water separator can achieve continuous separation work.

[0061] The steel structure support is a support that supports and fixes the spiral iron sheet slag-water separator to a certain height and angle, and at the same time makes the trough body and the cooling water collection guide groove well connected, ensuring that the cooling water containing oxidized iron sheet can be fully introduced into the spiral iron sheet slag-water separator.

[0062] The openable and closable slag hopper is used to collect the oxidized iron sheets transported by the suspended chain conveyor and the spiral oxidized iron sheets-water separator at the same time, and finally drop them into the oxidized iron sheets collection box. When a oxidized iron sheets collection box is full and needs to be transported away and replaced, the openable and closable slag hopper can close the slag hopper opening through the cylinder drive device, and the oxidized iron sheets transported will be temporarily stored in the slag hopper. After the new empty oxidized iron sheets collection box is in place, the cylinder drive device immediately opens the slag hopper and pours the temporarily stored oxidized iron sheets into the collection box. The oxidized iron sheets collection box can be replaced by a forklift or a workshop crane.

[0063] The entire workflow:

[0064] When the head of the billet comes out of the outlet of the heating furnace, the scale on the head of the billet begins to fall off. After the billet is completely out of the heating furnace, the conveyor roller behind the furnace will send it to the rough rolling unit for rolling. Since the rolling speed of the rough rolling unit is very low and the billet length is usually 9m, 12m or even 16m, when the rough rolling unit bites into the head of the billet, the middle and tail of the billet are still on the conveyor roller behind the furnace and slowly move toward the rough rolling unit. Therefore, from the time when the head of the billet just comes out of the heating furnace to the time when the tail of the billet is completely bitten by the first rolling mill of the rough rolling unit, the scale on the surface of the billet will fall off due to the impact and vibration between the billet and the roller.

[0065] The iron oxide scale that falls off the surface of the steel billet will all fall onto the chain plate of the suspended chain plate conveyor from the slag outlet of the elevated platform. The driving motor of the suspended chain plate conveyor can either rotate continuously to send the fallen iron oxide scale into the openable and closable slag collecting bucket, and finally fall into the iron oxide slag collection box; or it can rotate intermittently, so that a certain amount of iron oxide scale accumulates on the chain plate of the suspended chain plate conveyor, and then start and send the iron oxide scale into the iron oxide slag collection box, thereby reducing power consumption and other operating costs. The specific operation control method is mainly determined according to the needs of the site. The continuous operation mode of the suspended chain plate conveyor is suitable for the situation where the iron oxide scale of a single steel billet does not fall off a very large amount; the intermittent operation mode is suitable for the situation where the iron oxide scale of a single steel billet does not fall off much, and it can also save electricity.

[0066] From the time when the head of the billet enters the rough rolling unit to the time when the tail is completely bitten by the first rolling mill, the iron oxide scale that falls off the rolled piece will be flushed into the slag outlet of the elevated platform by the roller cooling water, and finally enter the spiral iron oxide slag-water separator through the cooling water collection guide groove, and is processed by the spiral iron oxide slag-water separator, and the separated iron oxide scale is sent to the openable and closable slag hopper and iron oxide slag collection box. Since the rough rolling unit and the roller cooling water are working continuously during normal production, the spiral iron oxide slag-water separator can maintain continuous operation and continuously process the cooling water flowing down the cooling water collection guide groove. When the tank capacity is much larger than the amount of cooling water flowing into the tank per unit time, the spiral iron oxide slag-water separator can also operate intermittently, so that more fine suspended iron oxide slag in the cooling water can be fully precipitated, which is conducive to more efficient separation of iron oxide slag and also conducive to saving electricity.

[0067] When a slag collecting box is full and needs to be transported away and replaced, the openable slag collecting hopper can close its opening, and the oxidized iron sheets transported by the spiral blades are temporarily stored in the slag collecting hopper. When a new empty slag collecting box is in place, the slag collecting hopper is immediately opened to pour the temporarily stored oxidized iron sheets into the collecting box. The slag collecting box can be replaced by a forklift or a workshop crane.

[0068] In summary, such a cycle can collect more than 90% of the scale oxide in the hot rolling production line in advance, without the need to use additional slag flushing water and slag flushing ditch to flush the scale oxide into the vortex well or a sedimentation tank, and then collect it with a grab crane, thus achieving energy conservation and emission reduction. At the same time, the slag flushing ditch design of the furnace roller and the rough rolling unit area is omitted, and only the slag ditch with a small slope and depth from the intermediate rolling unit to the finishing unit is retained to recycle a large amount of cooling water mixed with only a small amount of scale oxide powder. In fact, the elimination of the slag flushing ditch in the rear conveyor roller and rough rolling unit area where the scale oxide is mainly concentrated greatly reduces the depth and size of the vortex well or a sedimentation tank, reduces the scale of the production line turbid water treatment facilities, reduces the working frequency of the grab crane, improves the recovery rate and efficiency of the scale oxide, and effectively reduces the one-time investment cost and operating cost of the production line.

[0069] Figure 1 The layout of the traditional slag ditch. The center line of the furnace roller on the left side of the figure coincides with the center line of the slag ditch. After the billet is discharged from the furnace, it will pass through the furnace roller, rough rolling, intermediate rolling, intermediate rolling roller and the slag ditch corresponding to the finishing rolling in turn. The slag ditch bottom elevations of the slag ditch at the entrance of the furnace roller and the slag ditch in the finishing rolling area are relatively the highest, while the slag ditch bottom elevation between the rough rolling and intermediate rolling is the lowest and is in a "T" shape, so that the turbid circulating water at the entrance of the furnace roller and the finishing rolling area are gathered together, and then flow into the vortex well or a sedimentation tank through the "T" shaped slag ditch, and finally the turbid circulating water is reused and the iron oxide scale is recovered.

[0070] Figure 2This is the X1-X1 cross-section of the slag ditch of the traditional +5.00m platform production line. The main equipment of the production line is on the +5.00m platform. The shaded part in the figure is the cross-section of the slag ditch or slag ditch wall. The slag ditch corresponding to the furnace roller is suspended under the 5m platform and has a certain slope (0.03 is recommended), leaving space for personnel and logistics to pass with the ±0.00m floor. For the slag ditch in the rough rolling, intermediate rolling and finishing rolling areas, the slag ditch wall goes directly to the ±0.00m floor. Figure 3 As shown in the figure, the bottom elevation of the slag ditch in this area is lower than ±0.00m floor. The slag ditch wall can collect the cooling water flowing down from the rough rolling and intermediate rolling areas into the slag ditch. At the same time, there are holes in the slag ditch wall, and there are inspection and maintenance passages for operators to walk inside the slag ditch wall. For the slag ditch corresponding to the roller between the intermediate rolling and the finishing rolling, since the bottom elevation of the slag ditch is below ±0.00m floor, the area is not blocked by the slag ditch wall. In addition, the floor surface is blocked with a steel cover plate, which can be used for pedestrians and transportation equipment.

[0071] Embodiment 1

[0072] Figure 4 This is a production line without high-pressure water dephosphorization on the conveying roller after the furnace. For this production line form, the present invention proposes to set a suspended chain plate conveyor under the +5.00m platform corresponding to the furnace roller, set a spiral iron sheet slag-water separator under the rough rolling unit area, and set an openable and closable slag hopper between the two to collect the oxidized iron sheets separated and transported by the suspended chain plate conveyor and the spiral iron sheet slag-water separator, and finally fall into a iron sheet slag collection box set on the floor directly below the openable and closable slag hopper.

[0073] The structural composition of the suspended chain conveyor can be seen schematically Figure 5 The suspended chain plate conveyor can be directly suspended at the bottom of the +5.00m platform through the steel structure. It can be directly welded and fixed to the steel structure of the suspended chain plate conveyor by pre-embedded plates at the bottom of the platform, or it can be fixed by pre-embedded bolts. For the form after installation, please refer to Figure 6 The iron oxide scale falling from the conveyor roller behind the furnace will fall directly from the slag drop port on the +5.00m platform onto the chain plate of the suspended chain plate conveyor.

[0074] Figure 7 This is a cross section of a suspended chain conveyor.

[0075] The structural composition of the spiral iron slag-water separator can be seen schematically Figure 8. After the cooling water containing oxidized iron sheets in the rough rolling unit area flows down from the slag outlet of the +5.00m platform, it can be introduced into the trough of the spiral iron sheet slag-water separator through the cooling water collection guide trough. Finally, it is processed by the spiral iron sheet slag-water separator, and the separated oxidized iron sheets are sent to the openable and closable slag hopper and the iron sheet slag collection box (transported toward the heating furnace). The cooling water of the precipitated oxidized iron sheet slag in the trough of the spiral iron sheet slag-water separator will flow back to the slag flushing ditch in the intermediate rolling area through the overflow pipe set at the overflow side weir. The trough can continuously accommodate the newly flowing cooling water, so that the spiral iron sheet slag-water separator can achieve continuous separation work.

[0076] In the actual production process, the minimum billet discharge interval of the heating furnace of the rod and wire production line is about 5s, that is, a high-temperature billet is transported out of the heating furnace every 5s. The suspended chain plate conveyor and the spiral iron sheet slag-water separator can be started at the same time to continuously transport the oxidized iron sheet to the iron sheet slag collection box. In order to further save energy, reduce the maintenance cost of the equipment, and improve the iron sheet extraction and transportation capacity of the suspended chain plate conveyor and the spiral iron sheet slag-water separator, the suspended chain plate conveyor and the spiral iron sheet slag-water separator can be started intermittently. It can be set to start and run for 2 minutes, 5 minutes or 10 minutes every 10 minutes, 20 minutes, or even 30 minutes to collect and transport the oxidized iron sheet falling from the two areas respectively. However, the interval time should not be too long, otherwise too much oxidized iron sheet will be piled up on the chain plate surface, increasing the load of the suspended chain plate conveyor and its suspended steel structure.

[0077] The chain conveyor can transport scale at a variable conveying speed of 0.5m / min to 15m / min. Since the entrance area of ​​the furnace roller is closest to the heating furnace exit area, it is the area with the most scale. Therefore, after the interval downtime, a lot of scale will be accumulated on the chain plate of the suspended chain conveyor near the entrance area of ​​the furnace roller, while the scale from the furnace roller directly above the chain plate near the entrance of the roughing mill is less. In order to improve and give full play to the transportation efficiency of the suspended chain conveyor, the suspended chain conveyor that is restarted after the interval downtime will move the chain plate that has accumulated a lot of scale to the area near the entrance of the roughing mill, or directly dump a lot of scale into the openable and closable slag hopper and iron slag collection box at the end. At the same time, the chain plate of the suspended chain conveyor near the entrance area of ​​the furnace roller is a clean, unloaded chain plate without scale that is rotated.

[0078] During the intermittent shutdown of the spiral iron slag-water separator, the cooling water containing iron oxide in the rough rolling area will continuously flow into the tank of the spiral iron slag-water separator through the cooling water collection channel, and flow to the low point side of the tank for sufficient precipitation. After the interval shutdown time, the spiral iron slag-water separator that is restarted will transport the iron oxide precipitated at the bottom of the low point side of the tank to the iron slag outlet through the spiral blades within the specified startup time, and finally enter the openable and closable slag hopper and the iron slag collection box.

[0079] This system will work in a cyclical manner according to the above-mentioned operating mode to achieve intelligent and green extraction, collection and transportation of iron oxide scale.

[0080] Embodiment 2

[0081] For hot-rolled rod and wire production lines without high-pressure water dephosphorization machines, it is also possible to set up a suspended chain conveyor under the +5.0m platform of the furnace roller table, and set up an openable and closable slag collecting hopper at the end of the transportation (in the rough rolling direction). A sheet iron slag collection box is placed on the floor directly below the slag collecting hopper, and the slag ditch wall in the rough rolling area is retained, such as Fig.10 shown.

[0082] The discharge rollers will collide and vibrate with the steel billets when transporting them, causing the loose flaky iron oxide scale on the surface of the steel billets to fall off. Since the rolling line is not equipped with a high-pressure water descaling machine, there is no need to consider the recovery of cooling water and slag flushing water. The iron oxide scale falling from the discharge rollers can directly fall from the slag drop port on the +5.00m platform to the chain plate of the suspended chain plate conveyor, and finally enter the iron sheet slag collection box placed on the floor through the openable and closable slag collecting hopper. The suspended chain plate conveyor can adopt an intermittent working system as in Example 1 to maximize the efficiency of the equipment.

[0083] Embodiment 3

[0084] For high-pressure water dephosphorization production lines, high-pressure water descaling machines are usually installed at about 4m from the outlet of the heating furnace. High-pressure water descaling machines use high-pressure turbid circulating water to remove scale (iron oxide scale) from the steel billets that have just come out of the furnace. Therefore, there will be a large amount of cooling water and large pieces of flaky iron oxide scale in this area, which is very easy to block the traditional slag ditch system, and it is often necessary to equip it with a large flow of turbid circulating water for slag flushing treatment.

[0085] In the present invention, it is proposed to install a spiral iron sheet slag-water separator just below the platform of the high-pressure water descaling machine on the furnace roller, install a suspended chain plate conveyor in the subsequent area of ​​the furnace roller, and install an openable and closable slag collecting bucket between the two, and place an iron sheet slag collecting box on the floor. Fig.11 .

[0086] The high-pressure water and large pieces of oxidized iron sheets from the high-pressure water descaling machine can directly enter the spiral iron sheet slag-water separator from the slag outlet on the platform for treatment. The spiral iron sheet slag-water separator will transport the oxidized iron sheets to the openable and closable slag hopper and iron sheet slag collection box in the direction of rough rolling. The cooling water of the non-oxidized iron sheet slag that has been precipitated in the tank of the spiral iron sheet slag-water separator will flow back to the shallow ditch set on the floor through the overflow pipe set by the overflow weir, and finally flow into the slag flushing ditch in the rough rolling area; it can also flow directly into the sump of the furnace pit of the heating furnace nearby and be collected by the submersible sewage pump. A liquid level gauge is installed in the sump. When the water level exceeds a certain depth, the submersible sewage pump starts and works for a period of time, controls the water level at a low water level and stops the pump. In this way, the tank of the spiral iron sheet slag-water separator can continuously accommodate the newly flowing cooling water, so that the spiral iron sheet slag-water separator can achieve continuous separation work.

[0087] Under the +5.00m platform in the subsequent area of ​​the furnace roller table, the suspended chain conveyor can collect the residual iron oxide scale on the surface of the steel billet after descaling and transport it to the heating furnace, and finally fall into an iron slag collection box set on the floor just below the openable slag hopper. The specific layout is as follows: Fig.11 and Fig. 9 shown.

[0088] When the surface of the steel billet after descaling is very clean and there is no residual iron oxide that is easy to fall off, the spiral iron oxide slag-water separator installed just below the descaling machine installation platform can completely collect the iron oxide scattered at the entrance and exit of the descaling machine and the splashing cooling water. At this time, the suspended chain plate conveyor installed in the subsequent area of ​​the furnace roller can be shut down for a long time, and only receive the sporadic iron oxide fine powder falling from the conveying roller. When a certain amount of iron oxide accumulates on the chain plate of the suspended chain plate conveyor, the drive motor can be started to send the iron oxide into the openable and closable slag hopper and iron oxide slag collection box.

[0089] The working modes of the suspended chain conveyor and the spiral iron sheet slag-water separator in this embodiment can be the same as those in the first embodiment, and can adopt continuous or intermittent working modes at the same time, or only the spiral iron sheet slag-water separator can adopt continuous working mode, or only the suspended chain conveyor can adopt continuous working mode and the other can adopt intermittent working mode; the working modes of the two devices can also be flexibly modified according to the actual production conditions on site.

[0090] Embodiment 4

[0091] For the floor-type production line, the main equipment of the production line is on the ±0.00 floor, and the traditional slag ditch is all below the ±0.00 floor. The top view of the slag ditch of the traditional floor-type production line is the same as that of the +5.00m elevated platform production line. They all converge from the entrance of the furnace roller and the exit of the finishing mill to the middle, and finally flow to the vortex well or a settling tank. However, the cross-sectional view of the slag ditch of the traditional floor-type production line is different from that of the +5.00m elevated platform production line. There is no hanging slag ditch and a large range of slag ditch walls.

[0092] For the floor-type production line, the present invention can install a floor-type chain conveyor in the pit directly below the furnace roller to collect the oxidized iron sheets on the furnace roller and finally transport them to the iron sheet slag collection box. Fig.12 As shown. The conveying direction of the floor-type chain conveyor is the direction of the roughing mill. The iron slag collection box is placed in the collection pit below the entrance floor of the roughing mill. When the iron slag collection box is full, it can be lifted away by the crane in the plant and replaced with an empty iron slag collection box.

[0093] The structural form of the floor-standing chain conveyor is as follows: Fig.13 As shown in the figure, the supporting steel structure is under the conveyor, which allows the conveyor to be directly installed on the flat surface in the pit. At the same time, the chain plate surface can smoothly receive the oxidized iron scale falling from the furnace roller.

[0094] Embodiment 5

[0095] For the floor-type production line, the present invention can also install a floor-type chain plate conveyor in the pit directly below the furnace roller to collect the oxidized iron sheets on the furnace roller and transport them to another floor-type chain plate conveyor perpendicular to the rolling line, and finally send them to the iron sheet slag collection box at the end, such as Fig.14 shown.

[0096] The conveying direction of the floor-type chain conveyor directly below the furnace roller is the direction of the roughing mill. The floor-type chain conveyor perpendicular to the rolling line is installed at the entrance of the roughing mill and is located below the exit of the floor-type chain conveyor under the furnace roller. The iron oxide scale transported by the former will be directly dumped on the chain of the latter, and finally the latter will transfer the iron oxide scale to the iron slag collection box. See the layout diagram Fig.15 The floor-type chain conveyor perpendicular to the rolling line can also transport the iron oxide scale directly to the designated iron oxide scale storage point outside the workshop.

[0097] The present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. Many other changes and modifications that do not depart from the concept and scope of the present invention should be regarded as the protection scope of the present invention.

[0098] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0099] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A novel hot-rolled bar and wire scale collecting device, comprising a hot-rolled bar and wire conveying roller, characterized in that: A chain plate conveyor is arranged below the roller table; A slag collecting bucket is arranged at the tail of the chain plate conveyor; A sheet iron slag collecting box is arranged below the slag collecting hopper.

2. The novel hot-rolled bar and wire iron oxide scale collecting device according to claim 1, characterized in that: A slag drop opening is arranged below the roller conveyor, and the chain plate conveyor is arranged below the slag drop opening.

3. The novel hot-rolled bar and wire scale collecting device according to claim 1, characterized in that: A slag trough is also arranged below the roller, and the slag trough is provided with an inclined section; a spiral iron sheet slag-water separator is arranged in the inclined section of the slag trough.

4. The novel hot-rolled bar and wire scale collecting device according to claim 3 is characterized in that: The discharging end of the chain plate conveyor and the discharging end of the spiral iron sheet slag-water separator are arranged adjacent to each other; The slag collecting bucket is arranged below the discharging end of the chain plate conveyor and the discharging end of the spiral iron sheet slag-water separator.

5. The novel hot-rolled bar and wire scale collecting device according to claim 1, characterized in that: A suspension frame is arranged in the slag ditch, and the chain plate conveyor is installed on the suspension frame.

6. The novel hot-rolled bar and wire scale collecting device according to claim 1, characterized in that: A floor-mounted mounting frame is arranged in the slag ditch, and the chain plate type conveyor is installed on the floor-mounted mounting frame.

7. The novel hot-rolled bar and wire scale collecting device according to claim 1, characterized in that: The hot-rolled rod and wire transport roller table comprises: a rear roller table and a rough rolling unit.

8. A novel method for collecting iron oxide scale from hot-rolled bars and wires, characterized in that: The method comprises the following steps: The iron oxide scale falling off the surface of the steel billet falls onto the chain plate of the suspended chain plate conveyor; The driving motor of the suspended chain conveyor can rotate continuously or intermittently to send the fallen oxidized iron sheets into the slag collecting bucket and finally into the iron sheet slag collecting box; From the time when the head of the billet enters the rough rolling unit to the time when the tail is completely bitten by the first rolling mill, the iron oxide scale that falls off the rolled piece will be washed into the slag drop port of the elevated platform by the roller cooling water, and finally enter the spiral iron scale slag-water separator through the cooling water collection guide groove, and the spiral iron scale slag-water separator will send the separated iron oxide scale into the openable slag hopper and iron scale slag collection box; When a tin slag collection box is full, close the slag hopper opening; After replacing the empty iron slag collection box into place, open the slag hopper immediately.

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