A steel coil preheating device

Abstract

The present invention belongs to the technical field of metal heat treatment, and specifically is a steel coil preheating device, comprising a heating device, a nozzle and an auxiliary mechanism, wherein the auxiliary mechanism comprises a No. 1 leveling unit, a No. 2 leveling unit, a No. 3 leveling unit, a moving unit and a linkage unit, wherein the No. 1 leveling unit and the No. 2 leveling unit pre-level and support the steel coil while conveying the steel coil, so as to avoid warping and curling of the steel coil during preheating and transmission, and the No. 3 leveling unit supports and limits the steel coil during preheating, so as to ensure the flatness of the steel coil during preheating, and at the same time, the moving unit drives the nozzle to move, increases the heating range of the nozzle, and avoids uneven heating of a local position of the steel coil, and drives the linkage unit to work when the moving unit is working, so as to extend the steel coil to both sides, so as to avoid warping of the edge of the steel coil and bending of the middle of the steel coil, so as to further ensure the flatness of the steel coil during preheating, improve the preheating uniformity, and ensure the quality of the later galvanized layer.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal heat treatment equipment, and specifically relates to a steel coil preheating device. Background Art

[0002] When producing galvanized steel coils, surface pretreatment is usually required for the steel coils to be galvanized. This process generally includes pickling, water washing, dipping in a fluxing agent, baking and preheating, etc. Preheating the surface-treated steel coils can increase the contact area between the steel and the zinc liquid and improve the quality of the galvanized layer. Currently, the main methods for preheating steel include flame preheating method, electric heating preheating method, gas protection preheating method, etc. Among them, the principle of the flame preheating method is to mix gas and oxygen using a nozzle to form a high-temperature flame for preheating.

[0003] In the actual application process, a pay-off reel is usually arranged on one side of the flame preheating furnace, and a take-up reel is arranged on the other side. One end of the steel coil is wound around the pay-off reel, and the other end passes through the flame preheating furnace and is wound around the take-up reel. When the driving device drives the pay-off reel and the take-up reel to rotate, the steel coil can be pulled and driven, so that the steel coil on the take-up reel is continuously pulled out, and then reaches the take-up reel after being preheated by the flame preheating furnace.

[0004] However, to achieve the automatic and continuous preheating effect of the steel coil, it is usually automatically loaded by an uncoiler and taken up by a coiler. However, before the steel coil leaves the uncoiler and enters the flame preheating furnace and is not taken up by the coiler, this part of the steel coil is not pulled by the coiler, so this part is in a relaxed state, resulting in this part of the steel coil being prone to warping or bending when being transported by the uncoiler. There is a distance difference between the distance between the warped or bent part of the steel coil and the nozzle and the distance between the flat part of the steel coil and the nozzle, which will cause uneven heating of the local position of the steel coil and affect the preheating effect of the steel coil. Moreover, in the prior art, the position of the nozzle is fixed and the nozzles are arranged at intervals, so that the part of the steel coil directly below the nozzle and the part of the steel coil between two nozzles are heated unevenly, further affecting the later galvanizing effect.

[0005] In view of this, to improve the above technical problems, the present invention provides a steel coil preheating device. Summary of the Invention

[0006] The technical problems to be solved by the present invention are as follows: To achieve the automatic continuous preheating effect of steel coils, the uncoiler usually automatically loads the coils, and the coiler winds up the coils. However, before the steel coil leaves the uncoiler and enters the flame preheating furnace and is not wound up by the coiler, this part of the steel coil is not pulled by the coiler, so this part is in a relaxed state, resulting in the steel coil being prone to warping or bending when being transported by the uncoiler. There is a distance difference between the distance between the warped or bent part of the steel coil and the nozzle and the distance between the flat part of the steel coil and the nozzle, which will cause uneven heating of the local position of the steel coil and affect the preheating effect of the steel coil. Moreover, in the prior art, the position of the nozzle is fixed and the nozzles are arranged at intervals, so that the part of the steel coil directly below the nozzle and the part of the steel coil between two nozzles are heated unevenly, further affecting the later galvanizing effect.

[0007] A steel coil preheating device provided by the present invention includes a housing. The middle cavity of the housing is used for transporting the steel coil. The device further includes: protective covers. Protective covers are fixedly connected to the upper surface and the lower surface of the housing. Multiple groups of heating devices are installed in each of the protective covers. A plurality of nozzles are installed at the output end of each group of heating devices. All the nozzles are located inside the housing. The nozzles installed on the upper surface of the housing and the nozzles installed on the lower surface of the housing are symmetrically arranged on both sides of the steel coil. The heating devices are located outside the housing. A fixing block is arranged between the heating device and the nozzle. The nozzle is fixedly connected to the fixing block. A slider is fixedly connected between the fixing block and the heating device. The slider penetrates the surface of the housing and is slidably connected to the housing. An auxiliary mechanism is installed on the housing. The auxiliary mechanism includes a first leveling unit, a second leveling unit, a third leveling unit, a moving unit and a linkage unit.

[0008] Preferably, there are two groups of the first leveling units. The two groups of the first leveling units are respectively located on both sides of the housing. Each group of the first leveling units includes a first bracket and a second bracket. The first bracket is fixedly connected to the upper surface of the housing. The second bracket is fixedly connected to the lower surface of the housing. Both the first bracket and the second bracket are arranged in a "C" shape. A first smoothing roller is rotatably connected to the first bracket. A second smoothing roller is rotatably connected to the second bracket. The first smoothing roller and the second smoothing roller are symmetrically arranged on both sides of the steel coil and are in contact with the surface of the steel coil. The rotation directions of the first smoothing roller and the second smoothing roller are opposite.

[0009] Preferably, a water-absorbing cotton layer is fixedly connected to both the first smoothing roller and the second smoothing roller.

[0010] Preferably, there are four groups of the second leveling units, and the four groups of the second leveling units are respectively located at the four diagonal points of the housing. Each group of the second leveling units includes a guide rod. One end of the guide rod is located inside the housing, and the other end is close to the first smoothing roller. A first support rod is fixedly connected between the guide rod and the side surface of the housing. A guide groove is formed on the side surface of the guide rod close to the steel coil.

[0011] Preferably, an installation groove is formed on the side surface of each guide rod close to the center of the steel coil. The installation groove communicates with the guide groove. Two first rotating shafts are arranged in each installation groove. The two first rotating shafts are symmetrically arranged on both sides of the guide groove. Both ends of the first rotating shaft are rotatably connected to a first mounting plate. The first mounting plate is fixedly connected to the guide rod. An extension roller is fixedly connected to the first rotating shaft. A driving motor is fixedly connected to the first mounting plate. The rotating shaft of the driving motor is fixedly connected to the first rotating shaft.

[0012] Preferably, there are multiple groups of the third leveling units. Each group of the third leveling units is fixedly connected to a fixed block respectively. Each group of the third leveling units includes an L-shaped rod. The L-shaped rod is fixedly connected to the side surface of the fixed block close to the feed of the housing. A limiting rod is fixedly connected to the end surface of the L-shaped rod far from the fixed block. The limiting rod is in a V-shaped structure. A leveling rod is fixedly connected to the bent end of the limiting rod.

[0013] Preferably, among the multiple leveling rods, the leveling rod close to the guide rod includes a fixed rod and a rotating rod. One end of the fixed rod is fixedly connected to the limiting rod, and the other end is rotatably connected to the rotating rod. The end of the rotating rod far from the fixed rod is in an arc structure. The rotating rod and the guide rod have an overlapping part.

[0014] Preferably, rounded corners are formed on the bottom surfaces of the limiting rod and the leveling rod.

[0015] Preferably, the moving unit includes an isolation cover. The isolation cover is located outside the housing and is fixedly connected to the side surface of the housing. A hydraulic device is fixedly installed in the isolation cover. The output end of the hydraulic device is fixedly connected to a connecting plate. The connecting plate is slidably connected to the isolation cover. A plurality of first connecting rods are fixedly connected to the end surface of the connecting plate far from the hydraulic device. The first connecting rods penetrate through the side surface of the housing and are slidably connected to the side surface of the housing. Among the multiple fixed blocks, second connecting rods are fixedly connected between the multiple fixed blocks arranged side by side along the axis of the first smoothing roller. The single fixed block close to the isolation cover among the multiple fixed blocks is fixedly connected to the first connecting rod.

[0016] Preferably, the linkage unit includes a third connecting rod disposed on one side of each fixed block away from the L-shaped rod. The third connecting rod is fixedly connected to the fixed block. A rack is fixedly connected to the third connecting rod. A second rotating shaft is disposed between the rack and the steel coil. A fourth bracket is rotatably connected to the end of the second rotating shaft. The fourth bracket is fixedly connected to the housing. A gear is fixedly connected to the second rotating shaft. The gear meshes with the rack. An extension wheel is fixedly connected to the second rotating shaft. The extension wheel contacts the surface of the steel coil.

[0017] The beneficial effects of the present invention are as follows:

[0018] A steel coil preheating device provided by the present invention can pre-flatten and support the steel coil while transporting the steel coil by arranging a first flattening unit and a second flattening unit, avoiding phenomena such as edge warping and curling of the steel coil during preheating and transmission. When the steel coil moves away from the second flattening unit to the third flattening unit, the third flattening unit replaces the second flattening unit to support and limit the steel coil during preheating, ensuring the flatness of the steel coil during preheating, thereby improving the uniformity during preheating of the steel coil. At the same time, when the steel coil passes through the preheating area, the moving unit drives the nozzle to move, increasing the heating range of the nozzle, avoiding uneven heating of the part of the steel coil located between two nozzles and the part of the steel coil located directly below the nozzle, further avoiding uneven heating of the steel coil, improving the preheating effect, and driving the linkage unit to work when the moving unit works, stretching the steel coil to both sides, avoiding edge warping or curling of the steel coil, avoiding arching or depression in the middle of the steel coil, thereby ensuring the normal movement of the heating device, further ensuring the flatness of the steel coil during preheating, improving the preheating uniformity, and ensuring the quality of the later galvanized layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention be more clearly understood, the following further describes the present invention in detail according to specific embodiments in conjunction with the drawings.

[0020] Figure 1 is the overall external structure schematic diagram of the present invention;

[0021] Figure 2 is the overall bottom view structure schematic diagram of the present invention;

[0022] Figure 3 is the top view structure schematic diagram of the present invention;

[0023] Figure 4 is the side view structure schematic diagram of the present invention;

[0024] Figure 5 is the side view structure schematic diagram of the internal structure of the housing of the present invention;

[0025] Figure 6 of the present inventionFigure 5 Enlarged view of point A in the middle;

[0026] Figure 7 It is a schematic diagram of the internal structure of the housing and the protective cover of the present invention;

[0027] Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle;

[0028] Figure 9 It is a bottom view of the internal structure of the housing of the present invention;

[0029] Figure 10 For the present invention Figure 9 Enlarged view of point C in the middle;

[0030] Figure 11 It is a top view structural schematic diagram of the third leveling unit of the present invention;

[0031] Figure 12 For the present invention Figure 11 Enlarged view of point D in the middle;

[0032] Figure 13 It is a structural schematic diagram of the mobile unit of the present invention;

[0033] Figure 14 It is a structural schematic diagram of the first leveling unit, the second leveling unit and the third leveling unit of the present invention;

[0034] Figure 15 For the present invention Figure 14 Enlarged view of point E in the middle;

[0035] Figure 16 It is a schematic diagram of the guide rod structure of the present invention;

[0036] Figure 17 It is a structural schematic diagram of the third leveling unit of the present invention;

[0037] In the figure: 1. Housing; 2. Protective cover; 3. Heating device; 4. Nozzle; 5. Fixed block; 6. Slide block; 61. First leveling unit; 611. First support; 612. Second support; 613. First smoothing roller; 614. Second smoothing roller; 62. Second leveling unit; 621. Guide rod; 622. First support rod; 623. Guide groove; 63. Third leveling unit; 631. L-shaped rod; 632. Limit rod; 633. Leveling rod; 6331. Fixed rod; 6332. Rotating rod; 64. Moving unit; 641. Isolation cover; 642. Hydraulic device; 643. Connecting plate; 644. First connecting rod; 645. Second connecting rod; 65. Linkage unit; 651. Third connecting rod; 652. Rack; 653. Second rotating shaft; 654. Fourth support; 655. Gear; 656. Extension wheel; 7. Installation groove; 8. First rotating shaft; 9. First mounting plate; 10. Extension roller; 11. Driving motor. Detailed implementation manner

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0039] As Figures 1 to 6 , Figure 9 and Figure 10 shown, a steel coil preheating device provided by the present invention includes a housing 1. The middle cavity of the housing 1 is used for transporting the steel coil. It further includes: a protective cover 2. Protective covers 2 are fixedly connected to both the upper surface and the lower surface of the housing 1. Multiple groups of heating devices 3 are installed in each protective cover 2. The heating devices 3 adopt the flame preheating devices in the prior art. A plurality of nozzles 4 are installed at the output end of each group of heating devices 3. The plurality of nozzles 4 are all located inside the housing 1. The nozzles 4 installed on the upper surface of the housing 1 and the nozzles 4 installed on the lower surface of the housing 1 are symmetrically arranged on both sides of the steel coil. The heating devices 3 are located outside the housing 1. A fixed block 5 is arranged between the heating device 3 and the nozzle 4. The nozzle 4 is fixedly connected to the fixed block 5. A slide block 6 is fixedly connected between the fixed block 5 and the heating device 3. The slide block 6 penetrates the surface of the housing 1 and is slidably connected to the housing 1. The fixed block 5 and the slide block 6 are arranged as hollow structures. The air flow of the heating device 3 can reach the nozzle 4 through the slide block 6 and the fixed block 5. An auxiliary mechanism is installed on the housing 1. The auxiliary mechanism includes a first leveling unit 61, a second leveling unit 62, a third leveling unit 63, a moving unit 64 and a linkage unit 65. The auxiliary mechanism is used to keep the steel coil flat during preheating, improve the uniformity of the steel coil preheating, and prevent the steel coil from curling or bending during preheating, resulting in uneven heating and affecting the quality of the subsequent galvanized layer.

[0040] During operation, the controller controls the first flattening unit 61, the heating device 3, and the moving unit 64 to work. First, the operator uses the uncoiler to extend the head of the steel coil into the first flattening unit 61 near the feeding end of the housing 1. At the same time, the first flattening unit 61 pre-flattens the steel coil. Then, during the operation of the first flattening unit 61, the steel coil is transported to the second flattening unit 62. At this time, both sides of the steel coil will be supported and limited by the second flattening unit 62 located at the feeding end of the housing 1. Then, under the continuous transportation of the uncoiler and the first flattening unit 61, after breaking away from the clamping of the second flattening unit 62, it moves to the third flattening unit 63. The third flattening unit 63 replaces the second flattening unit 62 to continue flattening the steel coil to prevent phenomena such as edge warping and curling during preheating. Then, the steel coil moves below the nozzle 4, and the nozzle 4 sprays flames to heat the steel coil. At this time, the steel coil is located in the preheating area composed of multiple heating devices 3 and nozzles 4. At this time, the first flattening unit 61 continuously transports the steel coil to keep the steel coil moving. When the steel coil moves in the preheating area, it is continuously supported and limited by the third flattening unit 63 and is flattened to prevent phenomena such as edge warping and curling in the preheating area. When the steel coil passes through the preheating area, it enters the second flattening unit 62 located at the discharging end of the housing 1, then moves to the first flattening unit 61 located at the discharging end of the housing 1, and then is collected by the coiler, thereby improving the uniformity of preheating the head of the steel coil and the rest of the steel coil, ensuring the preheating effect of the entire steel coil. At the same time, during the preheating process, the steel coil is ensured to be flat to prevent its edge curling or bending during transportation from affecting the preheating effect.

[0041] At the same time, when the steel coil passes through the preheating area, the moving unit 64 drives the fixed block 5 to move, and the fixed block 5 drives the slider 6, the heating device 3, and the nozzle 4 to move, thereby increasing the heating range of the nozzle 4, preventing uneven heating between the part of the steel coil located between two nozzles 4 and the part of the steel coil located directly below the nozzle 4, further preventing uneven heating of the steel coil, improving the preheating effect, and during the movement of the fixed frame, driving the linkage unit 65 to work. When the linkage unit 65 works, it can prevent the edges of the steel coil from warping or curling, ensure the normal movement of the heating device 3, and at the same time can generate a pulling force on both sides of the steel coil to prevent the middle of the steel coil from arching or sagging, making the steel coil extend towards both sides, further ensuring the flatness of the steel coil during preheating and ensuring uniform preheating.

[0042] Moreover, the upper and lower layers of nozzles 4 can accelerate the heating of the steel coil and improve the heating efficiency.

[0043] Such as Figures 1 to 5 、 Figure 7As shown, there are two groups of No. 1 leveling units 61, and the two groups of No. 1 leveling units 61 are respectively located on both sides of the shell 1, that is, respectively located at the feeding end and the discharging end of the shell 1, for feeding and auxiliary discharging, and each group of No. 1 leveling units 61 includes a No. 1 bracket 611 and a No. 2 bracket 612, the No. 1 bracket 611 is fixedly connected to the upper surface of the shell 1, and the No. 2 bracket 612 is fixedly connected to the lower surface of the shell 1, and the No. 1 bracket 611 and the No. 2 bracket 612 are both set to a "匚"-shaped structure, and the No. 1 bracket 611 is rotated upward. The first smoothing roller 613 is rotatably connected to the second bracket 612, and the second smoothing roller 614 is rotatably connected to the first bracket 611 and the second bracket 612. Power motors are fixedly installed on the first bracket 611 and the second bracket 612. The output end of the power motor is fixedly connected to the first smoothing roller 613 and the second smoothing roller 614. The power motor is controlled by a controller. The first smoothing roller 613 and the second smoothing roller 614 are symmetrically arranged on both sides of the steel coil and contact with the surface of the steel coil. The rotation directions of the first smoothing roller 613 and the second smoothing roller 614 are opposite. Figure 4 As shown, the No. 1 smoothing roller 613 rotates counterclockwise to press down the steel coil that is warped or arched upward, and the No. 2 smoothing roller 614 rotates clockwise to lift up the steel coil that is bent or concave downward. Therefore, when the controller controls the power motor to start, the output shaft of the power motor drives the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 to rotate, so that the steel coil passing through the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 can be smoothed, and at the same time, the friction force is used to push the steel coil to move to the No. 2 leveling unit 62.

[0044] Since the steel coil needs to be pickled and washed with water before preheating, water stains will adhere to the surface of the steel coil, and the water stains adhered to the surface of the steel coil are often unevenly distributed, which will cause uneven heating at the locations where the water stains adhere to the steel coil, and the water stains after heating will be converted into water vapor and remain in the shell 1. Therefore, a water-absorbing cotton layer is fixedly connected to the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614. When the steel coil passes through the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 located at the discharge port of the shell 1, it can contact with the water-absorbing cotton layer to clean the water stains on the surface of the steel coil, thereby further improving the uniform heating and preheating effect of the steel coil.

[0045] like Figure 1 , Figure 2 , Figure 7 , Figure 11 , Figures 13 to 16As shown in the figure, there are four sets of second leveling units 62, and the four sets of second leveling units 62 are respectively located at the four diagonal points of the housing 1. Each set of second leveling units 62 includes a guide rod 621, and the guide rod 621 is perpendicularly arranged to the first smoothing roller 613. One end of the guide rod 621 is located inside the housing 1, and the other end is close to the first smoothing roller 613. A first support rod 622 is fixedly connected between the guide rod 621 and the side surface of the housing 1. A guide groove 623 is formed on the side surface of the guide rod 621 close to the steel coil, and the guide groove 623 penetrates through the two end faces of the guide rod 621. When the steel coil disengages from the first smoothing roller 613 and the second smoothing roller 614, it is pushed into the guide groove 623 of the guide rail by the first smoothing roller 613 and the second smoothing roller 614, and both sides of the steel coil are stuck into the guide groove 623. Since the four guide rods 621 are respectively located at the four diagonal points of the housing 1, therefore, the area between the two guide rods 621 at the feeding end of the housing 1 and the two guide rods 621 at the discharging end of the housing 1 is the preheating area of the steel coil, and the heating device 3 is located in the preheating area. Therefore, after the steel coil disengages from the first smoothing roller 613 and the second smoothing roller 614 at the feeding end of the housing 1, it will be restricted by the guide groove 623 before entering the preheating area, so that the steel coil is supported and limited by the guide rod 621 before preheating, ensuring the flatness of the steel coil during later preheating.

[0046] As Figure 16 shown in the figure, to further ensure the flatness of the steel coil during preheating, an installation groove 7 is formed on the side surface of each guide rod 621 close to the center of the steel coil. The installation groove 7 is communicated with the guide groove 623. Two first rotating shafts 8 are arranged in each installation groove 7, and the two first rotating shafts 8 are symmetrically arranged on both sides of the guide groove 623. Both ends of the first rotating shaft 8 are rotatably connected with a first mounting plate 9, and the first mounting plate 9 is fixedly connected with the end face of the guide rod 621. An extension roller 10 is fixedly connected to the first rotating shaft 8, and a driving motor 11 is fixedly connected to the first mounting plate 9. The rotating shaft of the driving motor 11 is fixedly connected with the first rotating shaft 8.

[0047] While controlling the power motor to start under the control of the controller, the driving motor 11 is controlled to start. The output shaft of the driving motor 11 rotates to drive the first rotating shaft 8 to rotate, and the first rotating shaft 8 rotates to drive the extension roller 10 to rotate. Since the four extension rollers 10 are all located on both sides of the steel coil and are all in contact with the surface of the steel coil, when the extension roller 10 rotates, the two sides of the steel coil can be stressed, and the stress on both sides of the steel coil is equal, thus avoiding the phenomenon of arching or depression in the middle of the steel coil, and further ensuring the flatness of the steel coil before preheating and ensuring the later preheating effect.

[0048] As Figures 5 to 14 、 Figure 17As shown in the figure, there are multiple groups of the third leveling units 63, and they are all located in the preheating area. Each group of the third leveling units 63 is fixedly connected to the fixed block 5 respectively. Each group of the third leveling units 63 includes an L-shaped rod 631. One side of the fixed block 5 close to the feeding end of the housing 1 is fixedly connected to one end of the L-shaped rod 631. A limiting rod 632 is fixedly connected to the end face of the L-shaped rod 631 away from the fixed block 5. The limiting rod 632 is in a V-shaped structure. A leveling rod 633 is fixedly connected to the bent end of the limiting rod 632. The bottom surface of the limiting rod 632 and the bottom surface of the leveling rod 633 are on the same plane and both are in contact with the surface of the steel coil. When the steel coil disengages from the guide rod 621, it will enter between the upper and lower layers of the leveling rods 633, and then enter between the upper and lower limiting rods 632, that is, the steel coil enters the preheating area. At this time, the flame ejected by the nozzle 4 reaches the surface of the steel coil to preheat the steel coil. When moving in the preheating area, the leveling rod 633 and the limiting rod 632 will always be in contact with the surface of the steel coil to ensure the flatness of the steel coil during preheating. At the same time, since the limiting rod 632 is in a V-shaped structure, it can increase the support range and ensure the leveling effect.

[0049] As Figure 5 , Figure 6 , Figure 11 , Figure 14 , Figure 15 and Figure 17 As shown in the figure, the leveling rod 633 close to the guide rod 621 among the multiple leveling rods 633 includes a fixed rod 6331 and a rotating rod 6332. One end of the fixed rod 6331 is fixedly connected to the limiting rod 632, and the other end is rotatably connected to the rotating rod 6332. The rotating rod 6332 has an overlapping part with the guide rod 621. When the moving unit 64 drives the heating device 3 to move, it can also drive the leveling rod 633 to move through the fixed block 5 and the L-shaped rod 631. Since the rotating rod 6332 has an overlapping part with the guide rod 621, when the leveling rod 633 moves to one side, it can drive the rotating rod 6332 to contact the guide rod 621 on this side, so that the rotating rod 6332 rotates towards the middle of the steel coil, and at the same time the end of the rotating rod 6332 will remain on the surface of the steel coil, so that the rotating rod 6332 will always be in contact with the surface of the steel coil, avoiding the side of the steel coil from warping or bending, so as to ensure that the leveling rod 633 can move reversely and reset.

[0050] As Figure 11 , Figure 12As shown in the figure, the figure includes three groups of heating devices 3, namely group a, group b, and group c. Among them, the heating devices 3 in group a are located at the feeding end of the housing 1, the heating devices 3 in group b are located in the middle of the housing 1, and the heating devices 3 in group c are located at the discharging end of the housing 1. It is necessary to ensure that there is an overlapping part between the limiting rod 632 connected to the heating devices 3 in group b and the leveling rod 633 connected to the heating devices 3 in group c, and there is an overlapping part between the leveling rod 633 connected to the heating devices 3 in group b and the limiting rod 632 connected to the heating devices 3 in group a. Thus, it can be ensured that during the movement of the steel coil, the three groups of leveling rods 633 and limiting rods 632 can successively and continuously support and smooth the steel coil, and the connection effect when the steel coil is supported between the front and rear groups of limiting rods 632 and leveling rods 633 can be ensured.

[0051] By setting the end of the rotating rod 6332 far from the fixed rod 6331 to be an arc structure, it can be ensured that the steel coil enters between the upper and lower layers of the leveling rods 633, improving the smoothing effect.

[0052] Since the moving unit 64 will drive the heating device 3 to reciprocate, the heating device 3 will drive the limiting rod 632 and the leveling rod 633 to reciprocate. To avoid damaging the surface of the steel coil when the limiting rod 632 and the leveling rod 633 reciprocate, and at the same time enable the steel coil to better enter between the upper and lower layers of the limiting rod 632 and the leveling rod 633, rounded corners are provided on the bottom surfaces of the limiting rod 632 and the leveling rod 633, making the limiting rod 632 and the leveling rod 633 have a guiding effect.

[0053] As Figures 2 to 4 、 Figure 11 and Figure 13 shown, due to the fixed position of the nozzle 4 in the prior art, it is easy to cause uneven heating of the steel coil between the two nozzles 4 and the steel coil directly below the nozzle 4. Therefore, a moving unit 64 is provided. The moving unit 64 includes an isolation cover 641. The isolation cover 641 is located outside the housing 1 and is fixedly connected to the side surface of the housing 1. A hydraulic device 642 is fixedly installed inside the isolation cover 641. The output end of the hydraulic device 642 is fixedly connected to a connecting plate 643. The connecting plate 643 is slidably connected to the isolation cover 641. A plurality of first connecting rods 644 are fixedly connected to the end surface of the connecting plate 643 far from the hydraulic device 642. The first connecting rods 644 penetrate through the side surface of the housing 1 and are slidably connected to the side surface of the housing 1. Among the plurality of fixing blocks 5, second connecting rods 645 are fixedly connected between the plurality of fixing blocks 5 arranged side by side along the axis of the first smoothing roller 613, connecting the plurality of fixing blocks 5 in series. Among the plurality of fixing blocks 5, the single fixing block 5 close to the isolation cover 641 is fixedly connected to the first connecting rod 644.

[0054] Therefore, when the controller controls the driving motor 11 to start, the hydraulic device 642 is controlled to start simultaneously. The contraction and extension of the output end of the hydraulic device 642 can drive the connecting plate 643 to move forward and backward. The connecting plate 643 drives the first connecting rod 644 to reciprocate. The first connecting rod 644 drives a plurality of fixing blocks 5 and the second connecting rod 645 to reciprocate. The fixing blocks 5 drive the slider 6 and the heating device 3 to slide on the housing 1. At the same time, the fixing blocks 5 drive the nozzle 4, the L-shaped rod 631, the limiting rod 632 and the leveling rod 633 to reciprocate, changing the position of the nozzle 4, avoiding the difference in heat received by the steel coil at the edge of the nozzle 4 and the steel coil directly below the nozzle 4, thereby further ensuring uniform heating of the steel coil and improving the preheating effect of the steel coil.

[0055] As Figures 5 to 8 and Figure 17 shown, when the moving unit 64 drives the nozzle 4, the L-shaped rod 631, the limiting rod 632 and the leveling rod 633 to reciprocate, in order to prevent the partial detachment of the limiting rod 632 from the edge of the steel coil, resulting in the lack of restraint of the steel coil edge, causing warping or bending, and preventing the nozzle 4, the L-shaped rod 631, the limiting rod 632 and the leveling rod 633 from resetting, a linkage unit 65 is provided. The linkage unit 65 includes a third connecting rod 651 provided on one side of each fixing block 5 away from the L-shaped rod 631. The third connecting rod 651 is fixedly connected to the fixing block 5. A rack 652 is fixedly connected to the third connecting rod 651. A second rotating shaft 653 is provided between the rack 652 and the steel coil. A fourth bracket 654 is rotatably connected to the end of the second rotating shaft 653. The fourth bracket 654 is fixedly connected to the housing 1. A gear 655 is fixedly connected to the second rotating shaft 653. The gear 655 meshes with the rack 652. An extension wheel 656 is fixedly connected to the second rotating shaft 653. The extension wheel 656 contacts the surface of the steel coil.

[0056] When the output end of the hydraulic device 642 expands and contracts, it will drive the fixing block 5 to reciprocate through the connecting plate 643. The fixing block 5 drives the rack 652 to reciprocate through the third connecting rod 651. The rack 652 drives the gear 655 to rotate reciprocally. When the gear 655 rotates reciprocally, it drives the extension wheel 656 to rotate through the second rotating shaft 653. The extension wheel 656 above the steel coil can press down the steel coil, and the extension wheel 656 below the steel coil can lift up the steel coil, thereby preventing the edge of the steel coil from warping or bending, effectively ensuring the flatness of the steel coil during preheating, and ensuring that the nozzle 4, the L-shaped rod 631, the limiting rod 632 and the leveling rod 633 can be normally reset.

[0057] Working principle:

[0058] During operation, the controller controls the driving motor 11, the heating device 3, the power motor and the hydraulic device 642 to work. First, the staff uses the uncoiler to extend the head of the steel coil between the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 near the feeding end of the shell 1. Since the output shaft of the power motor drives the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 to rotate, the steel coil passing through the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 can be smoothed. At the same time, the water-absorbing cotton layer on the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 absorbs the water stains on the surface of the steel coil, further improving the uniform heating and preheating effect of the steel coil. At the same time, the No. 1 smoothing roller 613 and the No. 2 smoothing roller 614 push the steel coil to move to the guide rod 621, so that the steel coil enters the guide groove 623 , so that the steel coil can be supported and limited by the guide rod 621 before preheating, ensuring the flatness of the steel coil during the later preheating, and when the steel coil passes through the guide groove 623, the extension roller 10 is driven by the drive motor 11 to rotate, and the extension roller 10 can make both sides of the steel coil bear force, and the forces on both sides of the steel coil are equal, thereby avoiding the phenomenon of arching or depression in the middle of the steel coil, thereby further ensuring the flatness of the steel coil before preheating and ensuring the later preheating effect, and then when the steel coil leaves the guide rod 621, it will enter between the upper and lower layers of leveling rods 633, and then enter between the upper and lower limit rods 632, that is, the steel coil enters the preheating area, at this time, the flame sprayed from the nozzle 4 reaches the surface of the steel coil, preheats the steel coil, and when moving in the preheating area, the leveling rod 633 and the limit rod 632 will always fit with the surface of the steel coil to ensure the flatness of the steel coil during preheating and avoid the steel coil from warping or curling in the preheating area. At the same time, when the steel coil passes through the preheating area, the output end contraction and extension of the hydraulic equipment 642 can drive the connecting plate 643 to move forward and reversely, and the connecting plate 643 drives the No. 1 connecting rod 644 to move back and forth. The No. 1 connecting rod 644 drives multiple fixed blocks 5 and the No. 2 connecting rod 645 to move back and forth. The fixed block 5 drives the slider 6 and the heating device 3 to slide on the shell 1. At the same time, the fixed block 5 drives the nozzle 4, the L-shaped rod 631, the limit rod 632 and the leveling rod 633 to move back and forth, changing the position of the nozzle 4 to avoid the difference in heating between the steel coil at the edge of the nozzle 4 and the steel coil directly below the nozzle 4. Thereby, the uniform heating of the steel coil is further ensured, and the preheating effect of the steel coil is improved. When the output end of the hydraulic equipment 642 is extended and retracted, the fixing block 5 is driven to move back and forth through the connecting plate 643. The fixing block 5 drives the rack 652 to move back and forth through the No. 3 connecting rod 651. The rack 652 drives the gear 655 to rotate back and forth. When the gear 655 rotates back and forth, it drives the extension wheel 656 to rotate through the No. 2 rotating shaft 653. The extension wheel 656 located above the steel coil can press the steel coil down, and the extension wheel 656 located below the steel coil can lift the steel coil up, thereby preventing the edge of the steel coil from warping or bending, effectively ensuring the flatness of the steel coil during preheating, and ensuring that the nozzle 4, L-shaped rod 631, limit rod 632 and leveling rod 633 can be reset normally. When the steel coil passes through the preheating area,It enters the second leveling unit 62 located at the discharge end of the housing 1, then moves to the first leveling unit 61 located at the discharge end of the housing 1, and is then collected by the coiler.

[0059] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A steel coil preheating device, comprising a housing (1), wherein a central cavity of the housing (1) is used for transmitting the steel coil, and characterized in that: It also includes: A protective cover (2) is fixedly connected to the upper and lower surfaces of the housing (1). Multiple groups of heating devices (3) are installed inside the protective cover (2). At the output end of each group of heating devices (3), multiple nozzles (4) are installed. All the nozzles (4) are located inside the housing (1). The nozzles (4) installed on the upper surface of the housing (1) and the nozzles (4) installed on the lower surface of the housing (1) are symmetrically arranged on both sides of the steel coil. The heating devices (3) are located outside the housing (1). A fixing block (5) is arranged between the heating device (3) and the nozzle (4). The nozzle (4) is fixedly connected to the fixing block (5). A sliding block (6) is fixedly connected between the fixing block (5) and the heating device (3). The sliding block (6) penetrates the surface of the housing (1) and is slidably connected to the housing (1). An auxiliary mechanism is installed on the housing (1). The auxiliary mechanism includes a first flattening unit (61), a second flattening unit (62), a third flattening unit (63), a moving unit (64), and a linkage unit (65); There are multiple groups of the third flattening units (63). Each group of the third flattening units (63) is fixedly connected to the fixing block (5) respectively. Each group of the third flattening units (63) includes an L-shaped rod (631). The fixing block (5) is fixedly connected to the L-shaped rod (631) on the side close to the feeding end of the housing (1). A limiting rod (632) is fixedly connected to the end surface of the L-shaped rod (631) far from the fixing block (5). The limiting rod (632) is in a V-shaped structure. A flattening rod (633) is fixedly connected to the bent end of the limiting rod (632); Among the multiple flattening rods (633), the flattening rod (633) close to the guide rod (621) includes a fixed rod (6331) and a rotating rod (6332). One end of the fixed rod (6331) is fixedly connected to the limiting rod (632), and the other end is rotatably connected to the rotating rod (6332). The end of the rotating rod (6332) far from the fixed rod (6331) is in an arc structure. The rotating rod (6332) and the guide rod (621) have an overlapping part.

2. A steel coil preheating device according to claim 1, characterized in that: There are two groups of the first flattening units (61). The two groups of the first flattening units (61) are respectively located on both sides of the housing (1). Each group of the first flattening units (61) includes a first bracket (611) and a second bracket (612). The first bracket (611) is fixedly connected to the upper surface of the housing (1). The second bracket (612) is fixedly connected to the lower surface of the housing (1). Both the first bracket (611) and the second bracket (612) are in a "C" - shaped structure. A first smoothing roller (613) is rotatably connected to the first bracket (611). A second smoothing roller (614) is rotatably connected to the second bracket (612). The first smoothing roller (613) and the second smoothing roller (614) are symmetrically arranged on both sides of the steel coil and are in contact with the surface of the steel coil. The rotating directions of the first smoothing roller (613) and the second smoothing roller (614) are opposite.

3. A steel coil preheating device according to claim 2, characterized in that: The first smoothing roller (613) and the second smoothing roller (614) are both fixedly connected with a water-absorbing cotton layer.

4. A steel coil preheating device according to claim 2, characterized in that: The No. 2 leveling unit (62) is provided with four groups, and the four groups of the No. 2 leveling units (62) are respectively located at four diagonal points of the shell (1), and each group of the No. 2 leveling units (62) includes a guide rod (621), one end of the guide rod (621) is located in the shell (1), and the other end is close to the No. 1 smoothing roller (613), and a No. 1 support rod (622) is fixedly connected between the guide rod (621) and the side of the shell (1), and a guide groove (623) is opened on the side surface of the guide rod (621) close to the steel coil.

5. A steel coil preheating device according to claim 4, characterized in that: Each guide rod (621) is provided with a mounting groove (7) on one side surface close to the center of the steel coil, and the mounting groove (7) is communicated with the guide groove (623). Two No. 1 rotating shafts (8) are arranged in each mounting groove (7), and the two No. 1 rotating shafts (8) are symmetrically arranged on both sides of the guide groove (623). The two ends of the No. 1 rotating shaft (8) are rotatably connected to a No. 1 mounting plate (9), and the No. 1 mounting plate (9) is fixedly connected to the guide rod (621). An extension roller (10) is fixedly connected to the No. 1 rotating shaft (8), and a driving motor (11) is fixedly connected to the No. 1 mounting plate (9), and the rotating shaft of the driving motor (11) is fixedly connected to the No. 1 rotating shaft (8).

6. The steel coil preheating device according to claim 1, characterized in that: The bottom surfaces of the limiting rod (632) and the leveling rod (633) are both provided with rounded corners.

7. The steel coil preheating device according to claim 2, characterized in that: The moving unit (64) comprises an isolation cover (641), wherein the isolation cover (641) is located outside the shell (1) and is fixedly connected to the side of the shell (1); a hydraulic device (642) is fixedly installed in the isolation cover (641); a connecting plate (643) is fixedly connected to the output end of the hydraulic device (642); the connecting plate (643) is slidably connected to the isolation cover (641); a plurality of No. 1 connecting rods (644) are fixedly connected to an end surface of the connecting plate (643) away from the hydraulic device (642); the No. 1 connecting rods (644) penetrate the side of the shell (1) and are slidably connected to the side of the shell (1); among the plurality of fixed blocks (5), a No. 2 connecting rod (645) is fixedly connected between the plurality of fixed blocks (5) arranged side by side along the axis of the No. 1 smoothing roller (613); and a single fixed block (5) close to the isolation cover (641) among the plurality of fixed blocks (5) is fixedly connected to the No. 1 connecting rod (644).

8. The steel coil preheating device according to claim 1, characterized in that: The linkage unit (65) includes a No. 3 connecting rod (651) arranged on a side of each fixed block (5) away from the L-shaped rod (631), the No. 3 connecting rod (651) is fixedly connected to the fixed block (5), a rack (652) is fixedly connected to the No. 3 connecting rod (651), a No. 2 rotating shaft (653) is arranged between the rack (652) and the steel coil, a No. 4 bracket (654) is rotatably connected to the end of the No. 2 rotating shaft (653), the No. 4 bracket (654) is fixedly connected to the shell (1), a gear (655) is fixedly connected to the No. 2 rotating shaft (653), the gear (655) is meshed with the rack (652), and an extension wheel (656) is fixedly connected to the No. 2 rotating shaft (653), and the extension wheel (656) is in contact with the surface of the steel coil.

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