Guiding unit, guiding device, hot bending unit and guiding method

Abstract

The present invention provides a guide unit, a guide device, a hot bending unit and a guiding method, which are used in a two-strand or multi-strand hot bending unit. The rolls of the two-strand or multi-strand hot bending unit have intermediate rolls corresponding to hot bending diversion. The guide unit includes a guide plate, the cross-sectional shape of the guiding portion of the guide plate corresponding to the cross-sectional shape of the intermediate roll; a support structure for supporting the guide plate, the guide plate being rotatably arranged on the support structure; and a driving device for driving the guide plate to rotate along the traveling direction of the steel plate during guiding and driving the guide plate to rotate back to its original position after guiding is completed. In the present invention, the guiding portion of the guide plate has a cross-sectional shape corresponding to that of the intermediate roll for cooperating with the head of the steel plate for guiding. The guide plate can rotate along the traveling direction and the reverse direction of the steel plate under the action of the driving device, so that it can return to its original position after guiding is completed and wait for guiding the next steel plate. The guide plate has a simple and compact structure and is convenient to be arranged in the relatively narrow space of the two-strand or multi-strand hot bending unit.

Description

Technical Field

[0001] The present invention belongs to the rolling technology field of the metallurgical industry, and particularly relates to a guard unit, a guard device, a hot bending unit and a guiding method. Background Art

[0002] Taking high-temperature steel strips (steel plates) as raw materials, the roll bending forming process is used to produce profiled steel, that is, the hot bending forming process. The hot bending guard device is an important device for realizing high-speed production and is mainly used for guiding during the steel plate threading process. In the double-stream or multi-stream production process, the gap between multiple juxtaposed steel plates is very small and the frame spacing is narrow, which cannot be achieved by traditional guard devices. Summary of the Invention

[0003] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a guard unit to facilitate the guiding of the steel plate threading of a double-stream or multi-stream hot bending unit.

[0004] To achieve the above purpose and other related purposes, the technical solution of the present invention is as follows:

[0005] A guard unit is used in a double-stream or multi-stream hot bending unit. The rolling rolls of the double-stream or multi-stream hot bending unit have intermediate rolls corresponding to hot bending splitting. The guard unit includes:

[0006] A guide plate for guiding during the progress of the steel plate. The cross-sectional shape of the guiding part of the guide plate corresponds to the cross-sectional shape of the intermediate roll;

[0007] A support structure for supporting the guide plate. The guide plate is rotatably arranged on the support structure;

[0008] A driving device for driving the guide plate to rotate along the progress direction of the steel plate during guiding and driving the guide plate to rotate back to its original position after guiding is completed.

[0009] With the above structure, the guiding part of the guide plate has a cross-sectional shape corresponding to that of the intermediate roll, that is, the guide plate matches the shape of the head of the steel plate and is used to cooperate with the head of the steel plate for guiding. The guide plate can rotate along the progress direction and the reverse direction of the steel plate under the action of the driving device, so that it can return to its original position after guiding is completed and wait for the guiding of the next steel plate. The guide plate has a simple and compact structure and is convenient to be arranged in the relatively narrow space of a double-stream or multi-stream hot bending unit.

[0010] Optionally, the guard unit further includes a resistance device for applying resistance to the guide plate, and the direction of the resistance is opposite to the progress direction of the steel plate.

[0011] Optionally, the support structure is a support frame, and the guide plate, the resistance device and the driving device are all installed on the support frame, and the support frame is fixed to the ground or the front and rear frames of the hot bending unit.

[0012] Optionally, the resistance device is a resistance roller, which is rotatably mounted on the support structure along its own axis. The rotation axis of the resistance roller is parallel to the rotation axis of the guide plate and is offset in the steel plate traveling direction; the driving device is in gear engagement with the resistance roller through a speed reducer, and the resistance roller is in gear engagement with the guide plate.

[0013] Optionally, the guiding unit further includes a lifting device for lifting the guide plate to withdraw the steel plate and lowering it to the initial position.

[0014] Optionally, the guide plate has a fan-shaped structure.

[0015] Optionally, the guiding portion of the guide plate corresponds to the head of the steel plate in the transverse direction, and the guide plate only guides the head of the steel plate.

[0016] Optionally, the rotational speed of the guide plate in the steel plate traveling direction is the same as the traveling speed of the steel plate; or the rotational speed of the guide plate in the steel plate traveling direction is less than the traveling speed of the steel plate.

[0017] The present invention also provides a guiding device for a dual-flow or multi-flow hot bending mill. The dual-flow or multi-flow hot bending mill has adjacent front and rear stands. The rolls of the front stand have a first intermediate roll corresponding to the hot bending splitting position, and the rolls of the rear stand have a second intermediate roll corresponding to the hot bending splitting position. The guiding device at least includes a first guiding unit and a second guiding unit arranged adjacent to each other front and back, and the first guiding unit and the second guiding unit adopt the above-mentioned guiding unit; the cross-sectional shape of the guiding portion of the guide plate of the first guiding unit corresponds to the cross-sectional shape of the first intermediate roll; the cross-sectional shape of the guiding portion of the second guiding unit corresponds to the cross-sectional shape of the second intermediate roll.

[0018] With the above structure, the cross-section of the guide plate of the first guiding unit corresponds to the intermediate roll of the front stand, and the cross-section of the guide plate of the second guiding unit corresponds to the intermediate roll of the rear stand. The two guiding units in the front and back are adjacent and connected, so as to realize the transition of different cross-section guiding, ensure that the steel plate is pressed during the threading process, and is smoothly threaded to the next roll. The guide plate has a simple and compact structure and is convenient to be arranged in the relatively narrow space of the dual-flow or multi-flow hot bending mill.

[0019] Optionally, the guiding device further includes at least one intermediate guiding unit located between the first guiding unit and the second guiding unit. The cross-sectional shape of the guiding portion of the guide plate of the intermediate guiding unit is an intermediate transition shape that transitions from the cross-sectional shape of the first intermediate roll to the cross-sectional shape of the second intermediate roll.

[0020] Optionally, the cross-sectional shape and size of the guiding portion of the guide plate of the first guide unit are the same as, or smaller than, the cross-sectional shape and size of the first intermediate roll; the cross-sectional shape and size of the guiding portion of the second guide unit are the same as the cross-sectional shape and size of the second intermediate roll; or are larger than the cross-sectional shape and size of the second intermediate roll.

[0021] Optionally, the guide plates of each of the guide units rotate and operate independently and are controlled independently.

[0022] Optionally, the guide plates of each of the guide units are driven to lift independently, or the guide plates of all the guide units are driven by the same mechanism to lift synchronously.

[0023] Optionally, the rotational speed of the guide plate in the direction of the steel plate travel is the same as the travel speed of the steel plate; or the rotational speed of the guide plate in the direction of the steel plate travel is less than the travel speed of the steel plate.

[0024] The present invention also provides a hot bending unit, including at least two racks and rolls provided on the racks, and further including the above-described guide device, wherein the first guide unit and the second guide unit are located between adjacent front and rear racks, the first guide unit is arranged upstream of the second guide unit, the first guide unit is located downstream of the first intermediate roll of the front rack, and the second guide unit is located upstream of the second intermediate roll of the rear rack; the first guide unit is connected to the second guide unit, or the first guide unit and the second guide unit are transitioned through an intermediate guide unit.

[0025] The present invention also provides a guiding method for the above-described hot bending unit. When the steel plate reaches the first guide unit through the first intermediate roll of the front rack, the guide plate of the first guide unit is driven to rotate in the direction of the steel plate travel, so that the guiding portion of the guide plate of the first guide unit remains in contact with the steel plate, and the steel plate is guided into the second guide unit; the guide plate of the second guide unit rotates in the direction of the steel plate travel to guide the steel plate until the steel plate is guided into the second intermediate roll of the rear rack; after the guiding of the guide plate of the corresponding guide unit is completed, the guide plate is withdrawn from the steel plate through the lifting device; after all the steel plates are rolled through, the lifting device drives the guide plate to descend to the initial position, and then the guide plate is rotated reversely back to the starting position through the driving device to wait for the biting of the next steel plate.

[0026] Optionally, a resistance device is provided to generate resistance to the guide plate to assist the guide plate in resisting the instantaneous impact of the steel plate.

[0027] Optionally, a detection device is used to detect whether the head of the steel plate reaches the bottom end of the guide plate. When it does not reach, the guide plate does not rotate; after reaching, the guide plate starts to rotate in the direction of the steel plate travel.

[0028] As described above, the beneficial effects of the present invention are as follows: The guiding portion of the guide plate has a cross-sectional shape corresponding to the intermediate roll of the front roll, and is used to cooperate with the head of the steel plate for guiding. The guide plate can rotate along the advancing direction and the reverse direction of the steel plate under the action of the driving device, so that it can return to its original position after the guiding is completed and wait for the guiding of the next steel plate. The guide plate has a simple and compact structure and is convenient to be arranged in the narrow spaces between adjacent stands and between adjacent steel plates of a double-strand or multi-strand hot bending mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the roll profile in the front stand of the hot bending mill in an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of the roll profile in the rear stand of the hot bending mill in an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the structure of the guide unit in an embodiment of the present invention;

[0032] Figure 4 Side view of the guide unit;

[0033] Figure 5 Schematic diagram of the guide device arranged between the front and rear rolls in an embodiment of the present invention;

[0034] Figure 6 Side view of the guide device in an embodiment of the present invention;

[0035] Figure 7 Schematic diagram of the guide device arranged between the front and rear rolls in another embodiment of the present invention (including the intermediate guide unit);

[0036] Figure 8 Schematic diagram of the guide plate arrangement corresponding to multi-strand steel plates in a single guide unit of the present invention.

[0037] Description of part numbers:

[0038] 1 - Roll of the front stand; 11 - First intermediate roll; 2 - Roll of the rear stand; 21 - Second intermediate roll; 3 - Steel plate; 31 - Head; 4 - Guide device; 4A - First guide unit; 4B - Second guide unit; 4C - Intermediate guide unit; 41 - Support frame; 42 - Guide plate; 42a - First guide plate; 42b - Second guide plate; 42c - Third guide plate; 43 - Driving device; 44 - Resistance device; 45 - Rotating shaft; 46 - Resistance shaft. DETAILED DESCRIPTION OF THE INVENTION

[0039] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0040] Embodiment

[0041] In this example, a guiding unit is exemplified, which is used in a two-strand or multi-strand hot bending mill. The rolling rolls of the two-strand or multi-strand hot bending mill have intermediate rolling rolls corresponding to the hot bending splitting positions, that is, it is divided into multiple strands along the width direction of the steel plate 3. Figure 1 The figure shows the roll profile schematic diagram of the front stand among two adjacent stands; Figure 2 The figure shows the roll profile schematic diagram of the rear stand among two adjacent stands; Among them, a pair of rolling rolls are arranged on the front stand, and the rolling rolls have a first intermediate rolling roll 11 corresponding to the splitting position. According to the different number of strands, the number of the first intermediate rolling rolls 11 distributed at intervals along the axial direction is different. In the illustrated example, it is a two-strand, and there is only one first intermediate rolling roll 11; The layout structure of the rear stand is similar to that of the front stand, and a second intermediate rolling roll 21 is arranged on the rolling rolls, and the pass profile of the second intermediate rolling roll 21 is deeper than that of the first intermediate rolling roll 11.

[0042] Such as Figure 3 and Figure 4 As shown, in this example, the guiding unit includes a guide plate 42, a support structure, and a driving device 43;

[0043] The guide plate 42 is used for guiding the steel plate 3 during the hot bending process, for example, during the process from the front stand to the rear stand. The cross-sectional shape of the guiding part of the guide plate 42 corresponds to the cross-sectional shape of the intermediate rolling roll, that is, it matches the shape of the position of the steel plate to be guided flowing into or out of the intermediate rolling roll; According to the different positions where the guide plate is set, the cross-sectional dimension of the guide plate can be slightly larger than, slightly smaller than, or the same as that of the intermediate rolling roll, so as to adapt to the small springback or deformation that may occur during the steel plate traveling process.

[0044] The support structure is used for supporting the guide plate 42, and the guide plate 42 is rotatably arranged on the support structure;

[0045] The driving device 43 is used for driving the guide plate 42 to rotate. When guiding, it drives the guide plate 42 to rotate along the conveying direction of the steel plate 3, and after the guiding is completed, it drives the guide plate 42 to rotate and reset to the initial position. The driving device 43 can adopt a motor.

[0046] In this example, the support structure is a support frame 41, and the guide plate 42 is installed on the support frame 41 so that it can rotate forward and backward (or swing within a certain range in the front and rear directions) through a rotating shaft 45. The motor is connected to the rotating shaft 45 or the guide plate 42 through a transmission mechanism or a reduction mechanism for driving.

[0047] The guiding portion of the guide plate 42 has a cross-sectional shape corresponding to the intermediate roll of the front roll, and is used to cooperate with the head 31 of the steel plate 3 for guiding. The guide plate 42 can rotate along the advancing direction and the reverse direction of the steel plate 3 under the action of the driving device 43, so that it can return to its original position after the guiding is completed and wait for the guiding of the next steel plate 3. The structure of the guide plate 42 is simple and compact, which is convenient for arranging in the relatively narrow space of the double-flow or multi-flow hot bending unit.

[0048] In this example, the guide plate 42 has a fan-shaped structure and rotates along its arc direction. Figure 3 The solid line in the figure is the starting position of the guide plate 42, and the dotted line is the end position of the guide plate 42; the outer end cross-section of the guide plate 42 has the same contour as the cross-section of the intermediate roll, and is generally in a V-shaped structure.

[0049] In one embodiment, the guiding unit further includes a resistance device 44 for applying resistance to the guide plate 42. The direction of the resistance is opposite to the advancing direction of the steel plate 3, and it assists the guide plate 42 to resist the instantaneous impact generated on the guide plate 42 when the steel plate 3 enters the guiding unit.

[0050] Among them, the resistance device 44 can be a rigid structure or an elastic buffer structure. The elastic buffer structure is, for example, a spring, a cylinder, etc. The resistance device 44 can be installed on the support frame 41, with one end fixed to the support frame 41 and the other end connected to the guide plate 42, pressing against the guide plate 42 and applying resistance; the magnitude of the resistance does not affect the rotation of the guide plate 42.

[0051] Among them, the resistance device 44 and the driving device 43 can apply forces to the guide plate 42 separately, that is, they are controlled independently; or they can act on the guide plate 42 together, that is, after the driving device 43 and the resistance device 44 are combined, they are then connected to the guide plate 42.

[0052] In this example, the resistance device 44 is a resistance roll. The resistance roll is installed on the support frame 41 through a resistance shaft 46 parallel to the rotating shaft 45. The resistance roll and the guide plate 42 are in gear cooperation to apply resistance to the guide plate 42 and assist the guide plate 42 to resist the instantaneous impact of the steel plate 3. The driving device 43 is a motor. The output end of the motor is connected with a speed reducer. The output end of the speed reducer and the resistance device 44 are in gear cooperation. After mutual cooperation, they drive the guide plate 42 to rotate, and at the same time, resistance is realized through the meshing of the gears, as Figure 3 shown. The axis of the resistance roll is offset from the axis of the guide plate rotation axis in the advancing direction of the steel plate. In this example, the resistance roll is located downstream of the conductive rotation axis and presses on the guide plate by its own weight to provide better resistance; ensuring the stability of the guide plate operation.

[0053] In one embodiment, the guide plate 42, the resistance device 44 and the driving device 43 are all installed on the support frame 41, and the support frame 41 is fixed to the ground or the front and rear frames of the hot bending unit.

[0054] In one embodiment, the guard unit further includes a lifting device for driving the guide plate 42 to move up and down. Its functions are as follows: after the guiding is completed, the guide plate 42 is lifted to pull away from the steel plate 3, so as to avoid or reduce the friction with the steel plate 3 and reduce wear; and it descends to the initial position before the next steel plate 3 is bitten in for the next guiding.

[0055] The lifting device can drive the guide plate 42 to move up and down alone, or drive the entire support frame 41 to move up and down; in this example, the entire support frame 41 is driven to move up and down, and a hydraulic cylinder or other means can be used.

[0056] For example, the guard unit is placed on a large platform between the front and rear racks as a whole. Multiple columns (usually four) are arranged on the large platform to support the guard unit. Hydraulic cylinders or screw lifts are arranged in two of the columns in the diagonal direction, and guide rods are arranged in the other columns. The overall lifting of the guard unit can be achieved by hydraulic cylinders or screw lifts.

[0057] Wherein, the guiding part of the guide plate 42 corresponds to the head 31 of the steel plate 3 in the transverse direction (i.e., the width direction), and the guide plate 42 only guides the head 31 of the steel plate 3, that is, guides the thermally bent part, keeps it pressed, and prevents it from bouncing open.

[0058] Optionally, the rotational speed of the guide plate 42 along the traveling direction of the steel plate 3 matches the running speed of the steel plate 3. Specifically, it is the same as or slightly less than the running speed of the steel plate 3 to ensure the pressure on the head 31 of the steel plate 3.

[0059] Figure 8 The figure shows a schematic diagram of a single guard unit. A plurality of guide plates 42 are arranged at intervals along the width direction of the steel plate 3. The plurality of guide plates 42 of the same guard unit can be driven by one motor, and a resistance device 44 is arranged on each guide plate 42.

[0060] This example also provides a guard device 4, which includes at least two of the above-mentioned guard units; this guard device 4 is used in a double-flow or multi-flow hot bending mill. Among them, the double-flow or multi-flow hot bending mill has adjacent front and rear racks, and the rear rack is located downstream of the front rack; the roll 1 of the front rack has a first intermediate roll 11 corresponding to the hot bending diversion position, and the roll 2 of the rear rack has a second intermediate roll 21 corresponding to the hot bending diversion position. The guard device 4 at least includes a first guard unit 4A and a second guard unit 4B arranged adjacent to each other front and back. The first guard unit 4A and the second guard unit 4B adopt the above-mentioned guard units; the structures of the guard units are the same, and the cross-sections of the guide plates 42 are different; wherein, the cross-sectional shape of the guiding part of the first guide plate 42a of the first guard unit 4A corresponds to the cross-sectional shape of the first intermediate roll 11; the cross-sectional shape of the guiding part of the second guide plate 42b of the second guard unit 4B corresponds to the cross-sectional shape of the second intermediate roll 21.

[0061] The cross-sectional shape of the first guide plate 42a corresponds to the first intermediate roll 11 of the front stand and matches the shape of the steel plate after being rolled by the first intermediate roll 11; the cross-sectional shape of the second guide plate 42b corresponds to the second intermediate roll 21 of the rear stand, that is, it matches the shape of the steel plate rolled by the second intermediate roll 21; the front and rear guide unit are adjacent and connected, so as to realize the guiding transition between different cross-sections, ensure that the steel plate 3 is pressed during the threading process, and is smoothly threaded to the next roll.

[0062] In this example, the cross-sectional shape size of the guiding part of the first guide plate 42a is the same as or slightly smaller than the cross-sectional shape size of the first intermediate roll 11 to adapt to the possible springback of the steel plate, so that the steel plate can be smoothly led out by the first intermediate roll 11; slightly smaller in size means that the corresponding pass is slightly shallower but has a similar shape; the cross-sectional shape size of the guiding part of the second guide plate 42b is the same as or slightly larger than the cross-sectional shape size of the second intermediate roll 21, so as to smoothly guide the steel plate into the second intermediate roll 21, and slightly larger in size means that the corresponding pass is slightly deeper but has a similar shape.

[0063] When the distance between the front and rear stands is small, the guiding can be completed by two guide units; when the distance between the front and rear stands is large, the number of guide units can be increased.

[0064] Specifically, in one embodiment, the guide device 4 further includes at least one intermediate guide unit 4C located between the first guide unit 4A and the second guide unit 4B. The cross-sectional shape of the guiding part of the guide plate (the third guide plate 42c) of the intermediate guide unit 4C is an intermediate transition shape from the cross-sectional shape of the first intermediate roll 11 to the cross-sectional shape of the second intermediate roll 21, that is, the cross-sectional shape of the third guide plate 42c is between the cross-section of the first guide plate 42a and the cross-section of the second guide plate 42b to achieve the transition.

[0065] In one embodiment, the guide plates of each guide unit rotate and act independently and are controlled separately. That is, in each guide unit of the guide device 4, each guide unit is provided with a driving device 43 to drive respectively to adapt to the sequence of the guide plate actions.

[0066] In one embodiment, the guide plates of each of the said guide unit are driven to lift separately, that is, the support frame 41 of each guide unit is driven by a correspondingly arranged lifting device. In this way, after each guide plate finishes guiding, the steel plate 3 can be withdrawn in time, reducing wear; alternatively, the guide plates of all guide units are driven to lift synchronously by the same mechanism, that is, all guide units are installed on the same support frame 41, and a lifting device is provided to drive the lifting; for synchronous lifting, that is, after the guide plates of all guide units finish guiding, the support frame 41 is lifted synchronously and lowered synchronously to the initial position. In this way, the equipment can be reduced. Although the guide plate that finishes guiding first will rub against the steel plate 3, due to the fast traveling speed of the steel plate 3, the introduction can be completed in a short time with little impact.

[0067] Based on the above-mentioned guide device 4, the present invention further provides a hot bending unit, including two or more racks arranged front and rear. Each rack is provided with rolling rolls, and also includes the above-mentioned guide device 4. Among them, the first guide unit 4A and the second guide unit 4B are located between the adjacent front rack and the rear rack. The first guide unit 4A is arranged upstream of the second guide unit 4B. The first guide unit 4A is adjacent to the first intermediate rolling roll 11 of the front rack, and is used to receive the steel plate 3 from the front rack and guide the steel plate 3 into the second guide unit 4B. The second guide unit 4B is connected to the second intermediate rolling roll 21 of the rear rack; the second guide unit 4B is adjacent to the first guide unit 4A and is used to guide the steel plate 3 into the rear rack. The distances between the first guide plate 42a and the first intermediate rolling roll 11, between the first guide plate 42a and the second guide plate 42b, and between the second guide plate 42b and the second intermediate rolling roll 21 need to ensure that the head 31 of the steel plate 3 is pressed during the traveling process of the steel plate 3 to ensure smooth connection before and after. Among them, the guide plates of each guide unit only swing by a certain angle, and the angle is set according to the guiding length of the steel plate 3.

[0068] In another embodiment, the first guide unit 4A and the second guide unit 4B are transitioned through an intermediate guide unit 4C. The intermediate guide unit 4C can be one or more, adjusted according to the distance, such as Figure 7 shown.

[0069] The present invention also provides a guiding method based on the above-mentioned hot bending machine group, when the steel plate 3 reaches the first guide unit 4A through the first intermediate rolling roller 11 of the front frame, the driving device 43 drives the guide plate of the first guide unit 4A to rotate along the traveling direction of the steel plate 3, so that the guiding part of the guide plate of the first guide unit 4A keeps in contact with the steel plate 3, and guides the steel plate 3 into the second guide unit 4B; the guide plate of the second guide unit 4B rotates along the traveling direction of the steel plate 3 to guide the steel plate 3 until the steel plate 3 is introduced into the second intermediate rolling roller 21 of the rear frame; after the guide plate guiding of the corresponding guide unit is completed, the guide plate is pulled away from the steel plate 3 by the lifting device; after the steel plate 3 is completely rolled through, the lifting device drives the guide plate to descend to the initial position, and then the driving device 43 is used to rotate the guide plate back to the starting position, waiting for the next steel plate 3 to bite.

[0070] A resistance device 44 is provided in each guide unit to generate resistance to the guide plate, thereby helping the guide plate to resist the instantaneous impact of the steel plate 3 .

[0071] After the guiding of the guide unit is completed, each guide unit can be independently pulled out of the steel plate 3, or all the guide units can be driven by the same mechanism to pull out the steel plate 3 together.

[0072] In one embodiment, a detection device is used to detect whether the head 31 of the steel plate 3 reaches the bottom of the guide plate. If not, the guide plate does not rotate. After reaching the bottom, the guide plate starts to rotate along the running direction of the steel plate 3. The detection device can be a hot metal detector, etc.

[0073] The advantages of the present invention are:

[0074] In a limited space, the contact area between the guiding part of the fan-shaped guide plate and the deformed part of the steel plate is larger than that of other traditional guiding devices (such as cylindrical rollers), and the guiding effect is strong.

[0075] The use of resistance structure can effectively control the impact of steel plate on the fan-shaped guide plate. The use of active guide method can reduce the friction between the steel plate and the guide, improve the surface quality of the product, and increase the product yield rate.

[0076] The fan-shaped guide plate has a compact structure and can be arranged in a small space in the middle of the frame. It has reasonable force and high strength.

[0077] Multiple fan-shaped guide plates can be arranged in a small space to make the guiding effect smoother.

[0078] Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person skilled in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A guiding unit for a double-stream or multi-stream hot bending mill. In the double-stream or multi-stream hot bending mill, the rolling rolls have intermediate rolling rolls corresponding to hot bending shunts. The guiding unit includes: A guide plate for guiding the steel plate during its travel. The cross-sectional shape of the guiding portion of the guide plate corresponds to the cross-sectional shape of the intermediate rolling roll. Each guide plate guides the steel plates in two adjacent streams. The guiding portion of the guide plate corresponds to the head of the steel plate in the transverse direction, and the guide plate only guides the head of the steel plate. A support structure for supporting the guide plate. The guide plate is rotatably arranged on the support structure. A driving device for driving the guide plate to rotate along the travel direction of the steel plate during guiding and driving the guide plate to rotate back to its original position after guiding is completed.

2. The guard unit according to claim 1, wherein: The guiding unit further includes a resistance device for applying resistance to the guide plate. The direction of the resistance is opposite to the travel direction of the steel plate.

3. The guard unit according to claim 2, wherein: The support structure is a support frame. The guide plate, the resistance device and the driving device are all installed on the support frame. The support frame is fixed to the ground or the front and rear frames of the hot bending mill.

4. The guard unit according to claim 2, wherein: The resistance device is a resistance roller. The resistance roller is rotatably installed on the support structure along its own axis. The rotation axis of the resistance roller is parallel to the rotation axis of the guide plate and is offset in the travel direction of the steel plate. The driving device is in gear engagement with the resistance roller through a speed reducer. The resistance roller is in gear engagement with the guide plate.

5. The guard unit according to claim 1, wherein: The guiding unit further includes a lifting device for lifting the guide plate to withdraw it from the steel plate and lowering it to the initial position.

6. The guard unit according to claim 1, wherein: The guide plate has a sector structure.

7. The guard unit according to claim 1, wherein: The rotation speed of the guide plate along the travel direction of the steel plate is the same as the travel speed of the steel plate; or the rotation speed of the guide plate along the travel direction of the steel plate is less than the travel speed of the steel plate.

8. A guiding device is used in a double-stream or multi-stream hot bending unit. The double-stream or multi-stream hot bending unit has adjacent front and rear stands. The rolls of the front stand have a first intermediate roll corresponding to the hot bending splitting position, and the rolls of the rear stand have a second intermediate roll corresponding to the hot bending splitting position. It is characterized in that: The guiding device at least includes a first guiding unit and a second guiding unit arranged adjacent to each other front and back. The first guiding unit and the second guiding unit adopt the guiding unit according to any one of claims 1-7. The cross-sectional shape of the guiding portion of the guide plate of the first guiding unit corresponds to the cross-sectional shape of the first intermediate rolling roll. The cross-sectional shape of the guiding portion of the second guiding unit corresponds to the cross-sectional shape of the second intermediate rolling roll.

9. The guard device according to claim 8, wherein: The guiding device further includes at least one intermediate guiding unit located between the first guiding unit and the second guiding unit. The cross-sectional shape of the guiding portion of the guide plate of the intermediate guiding unit is an intermediate transitional shape that transitions from the cross-sectional shape of the first intermediate rolling roll to the cross-sectional shape of the second intermediate rolling roll.

10. The guard device according to claim 8, wherein: The cross-sectional shape size of the guiding portion of the guide plate of the first guiding unit is the same as or smaller than the cross-sectional shape size of the first intermediate rolling roll. The cross-sectional shape size of the guiding portion of the guide plate of the second guiding unit is the same as or larger than the cross-sectional shape size of the second intermediate rolling roll.

11. The guard device according to any one of claims 8-10, characterized in that: The guide plates of each guiding unit rotate and act independently and are controlled independently.

12. The guard device according to any one of claims 8-10, characterized in that: The guide plates of each guiding unit are driven to lift independently, or the guide plates of all guiding units are driven to lift synchronously by the same mechanism.

13. A hot bending unit, comprising at least two frames and rollers arranged on the frames, characterized in that: It further includes a guiding device according to any one of claims 8-12, wherein the first guiding unit and the second guiding unit are located between an adjacent front rolling stand and a rear rolling stand, the first guiding unit is arranged upstream of the second guiding unit, the first guiding unit is located downstream of a first intermediate roll of the front rolling stand, and the second guiding unit is located upstream of a second intermediate roll of the rear rolling stand; the first guiding unit is connected to the second guiding unit, or the first guiding unit and the second guiding unit are transitioned through an intermediate guiding unit.

14. A guiding method for a hot bending unit according to claim 13, characterized in that: When the steel plate reaches the first guiding unit via the first intermediate roll of the front rolling stand, the guide plate of the first guiding unit is rotated along the traveling direction of the steel plate, so that the guiding portion of the guide plate of the first guiding unit remains in contact with the steel plate, and the steel plate is guided into the second guiding unit; the guide plate of the second guiding unit is rotated along the traveling direction of the steel plate to guide the steel plate until the steel plate is guided into the second intermediate roll of the rear rolling stand; after the guiding of the guide plate of the corresponding guiding unit is completed, the guide plate is withdrawn from the steel plate by a lifting device; after the whole steel plate is rolled through, the lifting device drives the guide plate to descend to the initial position, and then the guide plate is reversely rotated back to the starting position by a driving device to wait for the biting of the next steel plate.

15. The guiding method of the hot bending unit according to claim 14, characterized in that: A resistance device is arranged in each guiding unit to generate resistance to the guide plate and assist the guide plate to resist the instantaneous impact of the steel plate.

16. The guiding method of the hot bending unit according to claim 14, characterized in that: Whether the head of the steel plate reaches the bottom end of the guide plate is detected by a detection device. When it does not reach, the guide plate does not rotate; after it reaches, the guide plate starts to rotate along the running direction of the steel plate.

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