A heat treatment furnace roller brushing device

Abstract

The utility model relates to heat treatment technical field especially a kind of hot processing furnace brush roller device, including drive roll, height adjusting device, multiple drive devices, steel plate conveying surface, upper brush roller and lower brush roller, the drive roll, upper brush roller and lower brush roller are connected with a drive device, the height adjusting device is connected with the upper brush roller, the upper brush roller is set in the above of the steel plate conveying surface, the drive roll and lower brush roller are set in the below of the steel plate conveying surface.When there is steel plate between upper brush roller and lower brush roller, height adjusting device drives upper brush roller to press down, extrude steel plate to lower brush roller, so that the roller surface of lower brush roller is deformed, increase the contact force of upper brush roller and lower brush roller and steel plate surface, to improve the cleaning strength of upper surface and lower surface of steel plate, to ensure that scale and pellet and other impurities are cleaned thoroughly, reduce the incidence rate of nodulation phenomenon of furnace roller in heat treatment furnace.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology, and in particular to a brush roller device for a heat treatment furnace. Background Technology

[0002] After hot rolling or pretreatment, steel plates typically have iron oxide scale on their surface. Since the thermal conductivity of iron oxide scale is much lower than that of the metal matrix, uneven thickness of the scale can lead to uneven heating during heat treatment, creating temperature gradients. This not only results in uneven microstructure and decreased hardness after heat treatment but also increases thermal stress, raising the risk of deformation and even cracking. Therefore, it is necessary to remove the iron oxide scale from the surface of the steel plate before heat treatment.

[0003] In existing technologies, mechanical shot blasting is the primary method for removing iron oxide scale from the surface of steel plates before heat treatment. A centrifugal impeller propels shot (mainly steel shot) at high speed onto the steel plate surface. The impact and cutting action of the shot breaks down and peels off the iron oxide scale, achieving the purpose of removal. However, after mechanical shot blasting, some shot, fine iron oxide scale particles, and other impurities become magnetized and adhere to the surface of the steel plate. Due to their magnetic properties, these particles are carried into the heat treatment furnace with the steel plate and adhere to the furnace rollers, causing nodules to form on the rollers. Utility Model Content

[0004] The main purpose of this utility model is to provide a brush roller device for heat treatment furnaces, so as to solve the technical problem in the prior art that impurities such as shot and iron oxide scale particles will enter the heat treatment furnace with the steel plate and cause nodules on the furnace rollers.

[0005] To achieve the above objectives, this utility model provides a brush roller device for a heat treatment furnace, including a drive roller, a height adjustment device, multiple drive devices, a steel plate conveying surface, an upper brush roller, and a lower brush roller. The drive roller, the upper brush roller, and the lower brush roller are all connected to one drive device. The height adjustment device is connected to the upper brush roller. The upper brush roller is positioned above the steel plate conveying surface, and the drive roller and the lower brush roller are positioned below the steel plate conveying surface.

[0006] When there is no steel plate between the upper brush roller and the lower brush roller, the highest point of the outer ring of the lower brush roller is higher than the conveying surface of the steel plate;

[0007] When there is a steel plate between the upper brush roller and the lower brush roller, the highest point of the outer ring of the lower brush roller and the highest point of the outer ring of the drive roller are both flush with the conveying surface of the steel plate.

[0008] Furthermore, it also includes a lifting frame and a fixed frame, the lifting frame being slidably connected to the fixed frame, the drive roller and the lower brush roller being rotatably connected to the fixed frame, the upper brush roller being rotatably connected to the lifting frame, and the height adjustment device being connected to the lifting frame.

[0009] More preferably, the height adjustment device includes a lead screw, a gear set, and a first motor; the drive device includes a second motor; the first motor and the gear set are fixed on the fixed frame; the first motor is connected to the gear set; the gear set meshes with the lead screw; the fixed frame has a through hole perpendicular to the horizontal plane; the lead screw passes through the through hole and is connected to the lifting frame; the second motor is connected to the upper brush roller; and the second motor is fixedly connected to the lifting frame.

[0010] More preferably, the height adjustment device further includes a transmission rod, the lead screw includes a first lead screw and a second lead screw, the gear set includes a first gear set and a second gear set, the through hole includes a first through hole and a second through hole, the first lead screw and the second lead screw are symmetrically arranged with respect to the center line of the fixed frame, the first gear set and the first lead screw mesh, the second gear set and the second lead screw mesh, the first lead screw passes through the first through hole and is connected to the lifting frame, the second lead screw passes through the second through hole and is connected to the lifting frame, and the two ends of the transmission rod are respectively connected to the first gear set and the second gear set.

[0011] More preferably, the height adjustment device further includes a first hinge rod and a second hinge rod. The two ends of the first hinge rod are respectively hinged to the first lead screw and the lifting frame. The rotation direction of the hinge point between the first hinge rod and the first lead screw is the same as the steel plate transmission direction. The rotation direction of the hinge point between the first hinge rod and the lifting frame is consistent with the axial direction of the upper brush roller. The two ends of the second hinge rod are respectively hinged to the second lead screw and the lifting frame. The two ends of the second hinge rod are consistent with the two ends of the first hinge rod.

[0012] More preferably, the lifting frame includes a counterweight, the second motor is fixed to one end of the lifting frame, the counterweight is fixed to the other end of the lifting frame, and both ends of the lifting frame are located on a horizontal plane.

[0013] More preferably, the fixed frame and the lifting frame further include guide wheels and guide plates. The guide plates are fixed to the fixed frame by bolts, the guide wheels are rotatably connected to the lifting frame, and the guide wheels are connected to the guide plates to achieve longitudinal constraint of the lifting frame.

[0014] Furthermore, the drive device also includes a third motor, a fourth motor, and a coupling arm. The third motor is connected to the drive roller, and the two ends of the coupling arm are respectively connected to the fourth motor and the lower brush roller.

[0015] Furthermore, it also includes a collection pit, a collection hopper, and a collection box. The collection hopper is fixed above the collection pit, and the inlet of the collection hopper is located directly below the lower brush roller and the upper brush roller. The collection box is located inside the collection pit, and the opening of the collection box is located directly below the outlet of the collection hopper.

[0016] Furthermore, the lower brush roller includes a first lower brush roller and a second lower brush roller arranged in parallel. The first lower brush roller and the second lower brush roller are arranged sequentially along the steel plate conveying direction. The first lower brush roller is located behind the second lower brush roller. The rotation direction of the first lower brush roller is the same as the steel plate conveying direction, and the rotation direction of the second lower brush roller is opposite to that of the first lower brush roller. The upper brush roller is arranged between the first lower brush roller and the second lower brush roller, and the rotation direction of the upper brush roller is opposite to that of the steel plate conveying direction.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] When a steel plate is placed between the upper and lower brush rollers, the height adjustment device drives the upper brush roller to press down, squeezing the steel plate towards the lower brush roller. This causes deformation of the lower brush roller surface, increasing the contact force between the upper and lower brush rollers and the steel plate surface. This improves the cleaning power of the upper and lower surfaces of the steel plate, ensuring that impurities such as iron oxide scale and shot are thoroughly removed, and reducing the incidence of furnace roller nodule formation in the heat treatment furnace. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram showing the position and rotation of the upper brush roller, lower brush roller, and drive roller of this utility model.

[0021] Figure 2 This is a three-dimensional structural diagram of the hidden drive roller in one embodiment of the present invention;

[0022] Figure 3 This is a front sectional view of the overall structure in one embodiment of the present invention;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of a local structure;

[0024] Figure 5 for Figure 3 Sectional view at point AA;

[0025] Figure 6 This is a side view of the overall structure in one embodiment of the present invention.

[0026] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0027] Explanation of icon numbers:

[0028] 1. Drive roller; 2. Upper brush roller; 3. Lower brush roller; 301. First lower brush roller; 302. Second lower brush roller; 4. Collection hopper; 5. Fixed frame; 6. Lifting frame; 7. Second motor; 8. First motor; 9. Transmission rod; 10. Gear set; 1001. First gear set; 1002. Second gear set; 11. Fourth motor; 12. Coupling arm; 13. Collection box; 14. Collection pit; 15. Counterweight; 16. Steel plate; 17. Lead screw; 1701. First lead screw; 1702. Second lead screw; 1801. First hinge rod; 1802. Second hinge rod; 19. Guide wheel; 20. Guide plate; 21. Third motor. Detailed Implementation

[0029] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0033] Please see Figures 1 to 6 This embodiment provides a brush roller device for a heat treatment furnace, including a drive roller 1, a height adjustment device, multiple drive devices, a steel plate conveying surface, an upper brush roller 2, and a lower brush roller 3. The drive roller 1, upper brush roller 2, and lower brush roller 3 are each connected to a drive device. The height adjustment device is connected to the upper brush roller 2. The upper brush roller 2 is positioned above the steel plate conveying surface, while the drive roller 1 and lower brush roller 3 are positioned below the steel plate conveying surface. When there is no steel plate between the upper and lower brush rollers, the highest point of the outer ring of the lower brush roller 3 is higher than the steel plate conveying surface. When there is a steel plate between the upper and lower brush rollers, the highest point of the outer ring of both the lower brush roller 3 and the drive roller 1 is flush with the steel plate conveying surface. In this embodiment, the lower brush roller 3 has an elastic roller surface, or the lower brush roller 3 is connected to an elastic component. After the steel plate 16 is conveyed into the steel plate conveying surface, the upper brush roller 2 presses down on the steel plate 16 under the drive of the height adjustment device, so that the highest point of the outer ring of the lower brush roller 3 and the highest point of the outer ring of the drive roller 1 are both flush with the steel plate conveying surface, thereby increasing the contact force between the upper brush roller 2 and the lower brush roller 3 and the steel plate 16. In this embodiment, the steel plate 16 used is a discontinuous steel plate, and impurities located on the upper surface of the steel plate fall between the steel plates 16.

[0034] Specifically, in this embodiment, the distance between the lower brush roller 3 and the drive roller 1 is 500mm, the roller diameters of the upper brush roller 2 and the lower brush roller 3 are 220mm and 2350mm respectively, the maximum speed of the brush rollers is 100r / min, and the roller body material is carbon steel.

[0035] In this embodiment, the roller surface of the lower brush roller 3 is an elastic roller surface. When there is a steel plate between the upper and lower brush rollers, the height adjustment device drives the upper brush roller 2 to press down, squeezing the steel plate 16 towards the lower brush roller 3, causing the roller surface of the lower brush roller 3 to deform. This increases the contact force between the upper and lower brush rollers 2 and 3 and the surface of the steel plate 16, thereby improving the cleaning power of the upper and lower surfaces of the steel plate 16. This ensures that impurities such as iron oxide scale and shot are thoroughly removed, reducing the incidence of furnace roller nodule formation in the heat treatment furnace. Due to the weight of the steel plate 16, the adhesion of impurities such as shot and iron oxide scale located below the steel plate 16 is higher than that of impurities located above the steel plate 16. The roller surface of the lower brush roller 3 uses copper-plated stainless steel wire as bristles, while the roller surface of the upper brush roller 2 is equipped with steel wire bristles or plastic bristles.

[0036] like Figure 2 and Figure 3As shown, this embodiment also includes a lifting frame 6 and a fixed frame 5. The lifting frame 6 is slidably connected to the fixed frame 5. The drive roller 1 and the lower brush roller 3 are rotatably connected to the fixed frame 5. The upper brush roller 2 is rotatably connected to the lifting frame 6. The height adjustment device is connected to the lifting frame 6. In this embodiment, the fixed frame 5 includes a base, which is fixed to the ground and connected to the ground by anchor bolts. The connection between the drive roller 1 and the lower brush roller 3 and the fixed frame 5 not only reduces the vibration and noise generated during operation in this embodiment, but also provides stable support for the lower brush roller 3 and the drive roller 1, improving the stability of the steel plate 16 transmission.

[0037] In one embodiment, the height adjustment device includes a lead screw 17, a gear set 10, and a first motor 8. The drive device includes a second motor 7. The first motor 8 and the gear set 10 are fixed on the fixed frame 5. The first motor 8 is connected to the gear set 10, and the gear set 10 meshes with the lead screw 17. The fixed frame 5 has a through hole perpendicular to the horizontal plane. The lead screw 17 passes through the through hole and is connected to the lifting frame 6. The second motor 7 is connected to the upper brush roller 2 and is fixedly connected to the lifting frame 6.

[0038] As a further preferred embodiment, the height adjustment device further includes a transmission rod 9, the lead screw 17 includes a first lead screw 1701 and a second lead screw 1702, the gear set 10 includes a first gear set 1001 and a second gear set 1002, the through hole includes a first through hole and a second through hole, the first lead screw 1701 and the second lead screw 1702 are symmetrically arranged with respect to the center line of the fixed frame 5, the first gear set 1001 and the first lead screw 1701 are meshed, the second gear set 1002 and the second lead screw 1702 are meshed, the first lead screw 1701 passes through the first through hole and is connected to the lifting frame 6, the second lead screw 1702 passes through the second through hole and is connected to the lifting frame 6, and the two ends of the transmission rod 9 are respectively connected to the first gear set 1001 and the second gear set 1002. Since the upper brush roller 2 is not only responsible for cleaning the impurities on the upper surface of the steel plate 16, it also needs to press down the steel plate 16 to increase the contact force of the lower brush roller 3. Under the reaction force, the upper brush roller 2 is subjected to a huge reaction force. Two sets of lead screws 17 and gear sets 10 are set to connect the lifting frame 6, so that the height adjustment device can better adapt to the huge reaction force.

[0039] Furthermore, the height adjustment device also includes a first hinge rod 1801 and a second hinge rod 1802. The two ends of the first hinge rod 1801 are respectively hinged to the first lead screw 1701 and the lifting frame 6. The rotation direction of the hinge point between the first hinge rod 1801 and the first lead screw 1701 is the same as the steel plate transmission direction, and the rotation direction of the hinge point between the first hinge rod 1801 and the lifting frame 6 is consistent with the axial direction of the upper brush roller 2. The two ends of the second hinge rod 1802 are respectively hinged to the second lead screw 1702 and the lifting frame 6, and the two ends of the second hinge rod 1802 are consistent with the two ends of the first hinge rod 1801. When the upper brush roller 2 just contacts the steel plate 16 and is pressed down, it will be subjected to a huge reaction force. The connection between the height adjustment device and the lifting frame 6 is prone to cracking under impact. In this embodiment, it is connected to the lifting frame 6 by a hinge. The hinge has rotational damping, which can provide a certain buffer in the longitudinal direction (i.e., the steel plate transmission direction) and the transverse direction at the initial contact.

[0040] In a further preferred embodiment, the lifting frame 6 includes a counterweight 15, the second motor 7 is fixed to one end of the lifting frame 6, and the counterweight 15 is fixed to the other end of the lifting frame 6. Both ends of the lifting frame 6 are located on a horizontal plane. The weight of the counterweight 15 corresponds to that of the second motor 7, avoiding a situation where one side of the lifting frame 6 is heavier than the other, thus reducing the damage caused by uneven loading to this embodiment.

[0041] More preferably, a guide wheel 19 and a guide plate 20 are further included between the fixed frame 5 and the lifting frame 6. The guide plate 20 is fixed to the fixed frame 5 by bolts, and the guide wheel 19 is rotatably connected to the lifting frame 6. The guide wheel 19 and the guide plate 20 are in contact to achieve longitudinal constraint of the lifting frame 6. The contact between the guide wheel 19 and the guide plate 20 further increases the longitudinal constraint force of the upper brush roller 2 to resist the reaction force, and the huge constraint force does not affect the lifting function of the lifting frame 6.

[0042] In one embodiment, the driving device further includes a third motor 21, a fourth motor 11, and a coupling arm 12. The third motor 21 is connected to the drive roller 1, and the two ends of the coupling arm 12 are respectively connected to the fourth motor 11 and the lower brush roller 3. The lower brush roller 3 attracts and cleans impurities from the lower surface of the steel plate 16, and will be subjected to strong downward pressure and resistance. The low connection strength between the output shaft of the fourth motor 11 and the lower brush roller 3 may cause insufficient torque output. Using the coupling arm 12 to strengthen the connection stability between the output shaft of the fourth motor 11 and the lower brush roller 3 can make the torque output more stable.

[0043] Specifically, the second motor 7 and the fourth motor 11 have the same specifications and power, both with a rated output power of 1.5KW. The coupling arm 12 is equipped with a dustproof shell to prevent impurities and dust brushed off by the upper brush roller 2 and lower brush roller 3 from adhering to the coupling arm 12 and reducing its service life.

[0044] In one embodiment, the system further includes a collection pit 14, a collection hopper 4, and a collection box 13. The collection hopper 4 is fixed above the collection pit 14, and its inlet is located directly below the lower brush roller 3 and the upper brush roller 2. The collection box 13 is disposed within the collection pit 14, with its opening directly below the outlet of the collection hopper 4. In this embodiment, the collection pit 14 is created on the ground below the brush roller device of the heat treatment furnace. The collection box 13 is equipped with movable casters to propel it into the collection pit 14, facilitating the collection of impurities falling from the outlet of the collection hopper 4 and the replacement of the collection box 13.

[0045] In one embodiment, the lower brush roller 3 includes a first lower brush roller 301 and a second lower brush roller 302 arranged in parallel. The first lower brush roller 301 and the second lower brush roller 302 are arranged sequentially along the steel plate conveying direction. The first lower brush roller 301 is located behind the second lower brush roller 302. The rotation direction of the first lower brush roller 301 is the same as the steel plate conveying direction, and the rotation direction of the second lower brush roller 302 is opposite to that of the first lower brush roller 301. The upper brush roller 2 is arranged between the first lower brush roller 301 and the second lower brush roller 302, and the rotation direction of the upper brush roller 2 is opposite to that of the steel plate conveying direction. In this embodiment, the sum of the number of drive rollers 1 and lower brush rollers 3 rotating along the steel plate conveying direction is greater than the sum of the number of upper brush rollers 2 and lower brush rollers 3 rotating in the opposite direction, thereby ensuring that the steel plate conveying force is always greater than the resistance. The forward rotation of the first lower brush roller 301 and the reverse rotation of the second lower brush roller 302 ensure that the impurities are collected within the range of the collection hopper 4, preventing environmental pollution caused by impurities.

[0046] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A brush roller device for a heat treatment furnace, characterized in that, It includes a drive roller, a height adjustment device, multiple drive devices, a steel plate conveying surface, an upper brush roller, and a lower brush roller. The drive roller, the upper brush roller, and the lower brush roller are all connected to a drive device. The height adjustment device is connected to the upper brush roller. The upper brush roller is located above the steel plate conveying surface, and the drive roller and the lower brush roller are located below the steel plate conveying surface. When there is no steel plate between the upper brush roller and the lower brush roller, the highest point of the outer ring of the lower brush roller is higher than the conveying surface of the steel plate; When there is a steel plate between the upper brush roller and the lower brush roller, the highest point of the outer ring of the lower brush roller and the highest point of the outer ring of the drive roller are both flush with the conveying surface of the steel plate.

2. The heat treatment furnace brush roller device according to claim 1, characterized in that, It also includes a lifting frame and a fixed frame, the lifting frame and the fixed frame are slidably connected, the drive roller and the lower brush roller are rotatably connected to the fixed frame, the upper brush roller is rotatably connected to the lifting frame, and the height adjustment device is connected to the lifting frame.

3. The heat treatment furnace brush roller device according to claim 2, characterized in that, The height adjustment device includes a lead screw, a gear set, and a first motor. The drive device includes a second motor. The first motor and the gear set are fixed on the fixed frame. The first motor is connected to the gear set, and the gear set meshes with the lead screw. The fixed frame has a through hole perpendicular to the horizontal plane. The lead screw passes through the through hole and is connected to the lifting frame. The second motor is connected to the upper brush roller and is fixedly connected to the lifting frame.

4. The heat treatment furnace brush roller device according to claim 3, characterized in that, The height adjustment device further includes a transmission rod, the lead screw includes a first lead screw and a second lead screw, the gear set includes a first gear set and a second gear set, the first gear set is connected to the first motor, the through hole includes a first through hole and a second through hole, the first lead screw and the second lead screw are symmetrically arranged with respect to the center line of the fixed frame, the first gear set and the first lead screw mesh, the second gear set and the second lead screw mesh, the first lead screw passes through the first through hole and is connected to the lifting frame, the second lead screw passes through the second through hole and is connected to the lifting frame, and the two ends of the transmission rod are respectively connected to the first gear set and the second gear set.

5. The heat treatment furnace brush roller device according to claim 4, characterized in that, The height adjustment device further includes a first hinge rod and a second hinge rod. The two ends of the first hinge rod are respectively hinged to the first lead screw and the lifting frame. The rotation direction of the hinge point between the first hinge rod and the first lead screw is the same as the steel plate transmission direction. The rotation direction of the hinge point between the first hinge rod and the lifting frame is consistent with the axial direction of the upper brush roller. The two ends of the second hinge rod are respectively hinged to the second lead screw and the lifting frame. The two ends of the second hinge rod are consistent with the two ends of the first hinge rod.

6. The heat treatment furnace brush roller device according to claim 3, characterized in that, The lifting frame includes a counterweight, the second motor is fixed to one end of the lifting frame, the counterweight is fixed to the other end of the lifting frame, and both ends of the lifting frame are located on a horizontal plane.

7. The heat treatment furnace brush roller device according to claim 3, characterized in that, The fixed frame and the lifting frame are further provided with guide wheels and guide plates. The guide plates are fixed to the fixed frame by bolts. The guide wheels are rotatably connected to the lifting frame. The guide wheels are connected to the guide plates to achieve longitudinal constraint of the lifting frame.

8. The heat treatment furnace brush roller device according to claim 1, characterized in that, The drive device also includes a third motor, a fourth motor, and a coupling arm. The third motor is connected to the drive roller, and the two ends of the coupling arm are respectively connected to the fourth motor and the lower brush roller.

9. The heat treatment furnace brush roller device according to claim 1, characterized in that, It also includes a collection pit, a collection hopper, and a collection box. The collection hopper is fixed above the collection pit, and the inlet of the collection hopper is located directly below the lower brush roller and the upper brush roller. The collection box is located inside the collection pit, and the opening of the collection box is located directly below the outlet of the collection hopper.

10. The heat treatment furnace brush roller device according to claim 1, characterized in that, The lower brush roller includes a first lower brush roller and a second lower brush roller arranged in parallel. The first lower brush roller and the second lower brush roller are arranged sequentially along the steel plate conveying direction. The first lower brush roller is located behind the second lower brush roller. The rotation direction of the first lower brush roller is the same as the steel plate conveying direction, and the rotation direction of the second lower brush roller is opposite to that of the first lower brush roller. The upper brush roller is arranged between the first lower brush roller and the second lower brush roller. The rotation direction of the upper brush roller is opposite to that of the steel plate conveying direction.

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