Bending device and method for head and tail of strip steel

Abstract

The invention discloses a bending device and method for the head and the tail of strip steel, and the bending device comprises a first bending assembly fixed to one side of a pinch roll frame, a second bending assembly arranged below the first bending assembly, a jacking oil cylinder arranged below the second bending assembly, and a plurality of guide assemblies arranged on the two sides of the jacking oil cylinder. The first bending assembly comprises a first bending frame fixed to one side of the pinch roll frame and a first guide plate vertically arranged below the first bending frame. The second bending assembly comprises a first fixing frame fixed to one side of the pinch roll frame, a movable rack arranged above the first fixing frame and a second bending frame arranged between the movable rack and the pinch roll frame. The first bending assembly and the second bending assembly are arranged and matched with the synergistic effect of the jacking oil cylinder and the guide assembly, effective bending of the head and the tail of the strip steel is achieved, the bending precision and efficiency are improved, the operation difficulty is reduced, and the whole bending process is more stable and reliable.

Description

Technical Field

[0001] The present invention belongs to the technical field of strip steel processing, and particularly relates to a bending device and method for the head and tail of strip steel. Background Art

[0002] In the production and processing of stainless steel, hot rolling is a crucial process. However, stainless steel after hot rolling often exhibits work hardening phenomenon, resulting in insufficient properties of the finished product and difficulty in meeting the high requirements of users for material properties. To address this issue, it is usually necessary to reprocess the hot-rolled stainless steel coil. Among them, the annealing and pickling process is a common choice. The annealing and pickling process aims to eliminate the residual stress inside the hot-rolled steel coil and remove the scale on its surface through a series of delicate operation steps.

[0003] During the implementation of the annealing and pickling process, the processing of strip steel faces a series of challenges. Especially during operations such as uncoiling, straightening, coiling, and bundling, the head and tail of the strip steel are often in a warped state. This warping phenomenon not only increases the processing difficulty but also may have an adverse impact on subsequent processes. For example, during the coiling process, if the head of the strip steel is warped and uneven, it will not be able to smoothly enter the jaws of the coiling machine, thus affecting the normal progress of the coiling operation.

[0004] In addition, there is also a phenomenon that the tail of the strip warps outwards, which also destroys the fixing effect of the bundling belt, making it easier to bandage. This not only damages the equipment but also poses a safety hazard to the operation of the operators. To solve the above problems, technicians have taken a series of innovative measures. Among them, bending the tail of the strip towards the inside of the steel coil is an effective method. Through this treatment, the possibility of the tail of the strip warping outwards can be significantly reduced, thus avoiding the damage to the bundling belt caused by the warping of the tail of the strip. Therefore, in the prior art, how to bend the head and tail of the strip steel has become an urgent problem to be solved. To sum up, there is an urgent need for a bending device and method for the head and tail of strip steel. Summary of the Invention

[0005] To solve some or all of the above technical problems existing in the prior art, the present invention provides a bending device and method for the head and tail of strip steel.

[0006] On the one hand, the present invention discloses a bending device for the head and tail of strip steel. The bending device is arranged between the outlet turning pinch rolls and the outlet section. The outlet turning pinch rolls are provided with a pinch roll frame, and a detection module is arranged on the pinch roll frame. The bending device includes a first bending component fixed on one side of the pinch roll frame, a second bending component arranged below the first bending component, a jacking oil cylinder arranged below the second bending component, and a plurality of guiding components arranged on both sides of the jacking oil cylinder, wherein:

[0007] The first bending assembly includes a first bending frame fixed to one side of the pinch roll frame, and a first guide plate vertically arranged below the first bending frame. One end of the first guide plate close to the outlet section is inclined upward at a preset angle.

[0008] The second bending assembly includes a first fixing frame fixed to one side of the pinch roll frame, a moving frame arranged above the first fixing frame, and a second bending frame arranged between the moving frame and the pinch roll frame. A guide plate table is arranged above the moving frame, and a bending roll is arranged between the guide plate table and the second bending frame. The bending roll is fixed above the moving frame.

[0009] A first push rod is connected below the second bending frame, and a second guide plate is connected above. One end of the second guide plate close to the pinch roll frame is inclined downward at a preset angle. The moving frame is fixedly connected with a first sleeve through a connecting plate. The first push rod is in clearance fit with the first sleeve. A spring is further arranged on the outer periphery of the first push rod and is located between the second bending frame and the first sleeve. An adjusting nut is threadedly connected to the outer periphery of one end of the first push rod away from the second bending frame.

[0010] The guiding assembly includes a guiding frame fixed to the inner side of the first fixing frame. One end of the guiding frame is provided with a second sleeve, and a second push rod is sleeved in the second sleeve. The top end of the second push rod is connected to the bottom of the moving frame.

[0011] One end of the lifting oil cylinder is connected to one side of the pinch roll frame through a second fixing frame, and the other end is connected to the bottom of the moving frame.

[0012] Further, in the above bending device for the head and tail of the strip steel, the bending roll includes two bearing seats symmetrically fixed on the top of the moving frame, bearings embedded in the bearing seats, roll shafts respectively sleeved at both ends of the bearings, retaining rings arranged on the outer sides of the bearings, and gland plates arranged on the outer sides of the bearing seats.

[0013] Further, in the above bending device for the head and tail of the strip steel, the guide plate table includes a table frame fixed on the moving frame, a table top plate arranged on the top of the table frame, a lining plate arranged at the top end of the table top plate through fasteners, and a support plate arranged between the table top plate and the table frame.

[0014] Further, in the above bending device for the head and tail of the strip steel, a first bush is sleeved between the first sleeve and the first push rod, and the first bush is sleeved at both ends of the first push rod respectively.

[0015] Further, in the above bending device for the head and tail of the strip steel, a second bushing is sleeved between the second sleeve and the second push rod, and the second bushing is sleeved at both ends of the second push rod respectively.

[0016] As a specific implementation manner, in the above bending device for the head and tail of the strip steel, an oil nozzle is arranged on the second sleeve, and the oil nozzle communicates with the outer peripheral surface of the second push rod.

[0017] Further, in the above bending device for the head and tail of the strip steel, a support plate is arranged on the outer periphery of the first sleeve, and the support plate is fixed to the connecting plate.

[0018] As a specific implementation manner, in the above bending device for the head and tail of the strip steel, the preset angle at which the first guide plate inclines obliquely upward is 50° - 60°, and the preset angle at which the second guide plate inclines obliquely downward is 25° - 30°.

[0019] As a specific implementation manner, in the above bending device for the head and tail of the strip steel, a reinforcing rib is arranged between the first bending frame and the first guide plate.

[0020] On the other hand, the bending method for the head and tail of the strip steel provided by the present invention includes:

[0021] Step 1: When the strip steel extends from the outlet section and enters the outlet turning pinch rolls, the detection device is used to control the head of the strip steel to stay between the first guide plate and the second guide plate.

[0022] Step 2: The lifting oil cylinder is used to drive the moving rack to move upward, thereby driving the bending roll and the second bending frame to move upward synchronously. As the moving rack is lifted upward, the upper roll surface of the bending roll contacts the bottom surface of the strip steel, and the top surface of the second guide plate contacts the bottom surface of the strip steel.

[0023] Step 3: The lifting oil cylinder continues to drive the moving rack to lift upward, and the strip steel is gradually clamped under the clamping of the first guide plate and the second guide plate. The bending roll and the strip steel supported by it can continue to move upward with the moving rack. At this time, the first guide plate, the second guide plate, and the part of the strip steel clamped between them are all in a static state, and the strip steel on the bending roll contacts the part of the first guide plate that inclines obliquely upward to form a bending state.

[0024] Step 4: After the tail of the strip steel goes through the above steps 1 to 3, a bending state can be formed.

[0025] The bending device and method for the head and tail of the strip steel of the present invention have the following advantages and positive effects:

[0026] (1) By setting the first bending component and the second bending component, and cooperating with the synergistic action of the lifting oil cylinder and the guiding component, the present invention realizes the effective bending of the head and tail of the strip steel, which not only improves the bending accuracy and efficiency, but also reduces the operation difficulty, making the whole bending process more stable and reliable. During the bending process, the position of the strip steel is monitored in real time through the detection module, ensuring the accuracy and timeliness of bending, and significantly improving the automation level and production efficiency of the stainless steel annealing and pickling treatment line;

[0027] (2) In the present invention, the first push rod and the second push rod are respectively guided and supported through the first sleeve and the second sleeve, and a spring and an adjusting nut are arranged on the outer periphery of the first push rod, and the distance between the second bending frame and the first sleeve can be adjusted according to actual needs, so as to adapt to the bending requirements of strip steels with different thicknesses and materials, having good adaptability. And through the setting of the guiding component, the stability and service life of the equipment are also increased, and the first guide plate and the second guide plate are respectively inclined at a preset angle obliquely upward and obliquely downward, which is convenient for better bending the strip steel in cooperation with the bending roller, improving the bending effect, and having good practicability. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings. In the drawings:

[0029] Figure 1 is a schematic structural diagram of the bending device for the head and tail of the strip steel of the present invention;

[0030] Figure 2 is a diagram of the use state of the bending device for the head and tail of the strip steel of the present invention;

[0031] Figure 3 is a schematic structural diagram of the lifting oil cylinder in the bending device for the head and tail of the strip steel of the present invention;

[0032] Figure 4 is a schematic structural diagram of the support plate in the bending device for the head and tail of the strip steel of the present invention;

[0033] Figure 5 is a schematic structural diagram of the guide plate table in the bending device for the head and tail of the strip steel of the present invention;

[0034] Figure 6It is a schematic structural diagram of the guiding component in the bending device for the head and tail of the strip steel of the present invention;

[0035] Figure 7 It is a schematic structural diagram of the second bending frame in the bending device for the head and tail of the strip steel of the present invention;

[0036] Figure 8 is Figure 3 The partial enlarged view of I in.

[0037] Explanation of the reference numerals in the drawings:

[0038] 1 - First bending assembly, 11 - First bending frame, 12 - First guide plate, 2 - Second bending assembly, 21 - First fixing frame, 22 - Moving frame, 23 - Second bending frame, 24 - Adjusting nut, 25 - Spring, 26 - First push rod, 27 - Second guide plate, 28 - First sleeve, 29 - Support plate, 3 - Lifting oil cylinder, 31 - Second fixing frame 31, 4 - Guiding component, 41 - Guiding frame, 42 - Second sleeve, 43 - Second push rod, 44 - Oil nozzle, 5 - Guide plate table, 51 - Table frame, 52 - Table panel, 53 - Liner, 54 - Support plate, 6 - First bushing, 7 - Second bushing, 8 - Bending roller, 81 - Bearing seat, 82 - Bearing, 83 - Roller shaft, 84 - Retaining ring, 85 - gland, 9 - Strip steel, 100 - Pinch roll frame. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0040] As Figures 1 to 8 shown, the present invention provides a bending device and method for the head and tail of strip steel.

[0041] On the one hand, the present invention discloses a bending device for the head and tail of a strip steel. The bending device is arranged between the exit turning pinch rolls and the exit section. The exit turning pinch rolls are provided with a pinch roll frame 100, and a detection module (not shown in the figure) is arranged on the pinch roll frame 100. The detection module is used to detect the position of the strip steel 9. The bending device includes a first bending assembly 1 fixed to one side of the pinch roll frame 100, a second bending assembly 2 arranged below the first bending assembly 1, a jacking oil cylinder 3 arranged below the second bending assembly 2, and a plurality of guiding assemblies 4 arranged on both sides of the jacking oil cylinder 3. Among them, the first bending assembly 1 includes a first bending frame 11 fixed to one side of the pinch roll frame 100 through fasteners, and a first guide plate 12 vertically arranged below the first bending frame 11. One end of the first guide plate 12 close to the exit section is inclined obliquely upward by a preset angle;

[0042] The second bending assembly 2 includes a first fixing frame 21 fixed to one side of the pinch roll frame 100, a moving frame 22 arranged above the first fixing frame 21, and a second bending frame 23 arranged between the moving frame 22 and the pinch roll frame 100. The moving frame 22 is welded by several steel plates, which ensures the strength of the structure and at the same time reduces the weight. A guide plate table 5 is fixed above the moving frame 22 through fasteners. A bending roll 8 is arranged between the guide plate table 5 and the second bending frame 23, and the bending roll 8 is fixed above the moving frame 22 through fasteners;

[0043] A first push rod 26 is connected below the second bending frame 23, and a second guide plate 27 is connected above. One end of the second guide plate 27 close to the pinch roll frame 100 is inclined downward at a preset angle. The moving frame 22 is fixedly connected with a first sleeve 28 through a connecting plate. The first push rod 26 is in clearance fit with the first sleeve 28. A spring 25 is also arranged on the outer periphery of the first push rod 26. The spring 25 is located between the second bending frame 23 and the first sleeve 28. A regulating nut 24 is threadedly connected to the outer periphery of the end of the first push rod 26 away from the second bending frame 23. By rotating the regulating nut 24, the distance between the second bending frame 23 and the first sleeve 28 can be further adjusted. When the first push rod 26 is stationary, the first sleeve 28 can move upward along the axis of the first push rod 26 and compress the spring 25. During this process, the pressure exerted by the spring 25 on the second bending frame 23 intensifies with the compression degree of the spring 25. The guiding assembly 4 includes a guiding frame 41 welded and fixed to the inner side of the first fixing frame 21. The guiding frame 41 is processed by cutting a steel plate. A second sleeve 42 is welded and fixed to the end of the guiding frame 41 away from the first fixing frame 21. A second push rod 43 is sleeved in the second sleeve 42. The second push rod 43 can freely slide along the inner wall of the second sleeve 42. The top end of the second push rod 43 is fixedly connected to the bottom of the moving frame 22 through a fastener. The inner diameter of the middle section of the second sleeve 42 is slightly larger than the outer diameter of the second push rod 43, so that the second push rod 43 and the second sleeve 42 do not contact at this part, reducing the sliding contact surface under the condition of meeting the use requirements and increasing the service life. The second push rod 43 is processed from round steel and its surface is heat-treated to increase its wear resistance. One end of the jacking oil cylinder 3 is connected to one side of the pinch roll frame 100 through a second fixing frame 31, and the other end is connected to the bottom of the moving frame 22. The second fixing frame 31 is fixedly connected to one side of the pinch roll frame 100 through a fastener. By the telescopic movement of the jacking oil cylinder 3, the up and down movement of the moving frame 22 can be realized. By arranging the guiding assembly 4 at both ends of the jacking oil cylinder 3, during the upward movement of the jacking oil cylinder 3, the moving frame 22 is driven to move upward synchronously, and then the second push rod 43 is driven to move upward synchronously along the axis of the second sleeve 42, ensuring the smooth movement of the equipment and avoiding the phenomenon that during the up and down movement of the moving frame 22, due to both ends being in a cantilever state, the movement on both sides is asynchronous and the equipment gets stuck.

[0044] Further, in the bending device for the head and tail of the strip steel of the present invention, the bending roll 8 includes two bearing seats 81 symmetrically fixed to the top of the moving frame 22, bearings 82 embedded in the bearing seats 81, roll shafts 83 sleeved on the bearings 82 at both ends, retaining rings 84 arranged outside the bearings 82, and gland plates 85 arranged outside the bearing seats 81. Since the surface of the roll shaft 83 often contacts and bends the strip steel 9, the roll shaft 83 needs to be processed with materials having high strength and good wear resistance. At the same time, a heat treatment process is applied to the surface of the roll shaft 83, and then the surface of the roll shaft 83 is ground after processing to make it have a high surface finish. When the surface of the strip steel 9 contacts the surface of the roll shaft 83, the surface quality of the strip steel 9 can be effectively guaranteed. More specifically, the bearing 82 adopts a double-row self-aligning roller bearing 82, which has a large radial load capacity and can also withstand heavy loads and impact loads. The two ends of the inner ring of the bearing 82 are fixed respectively by the shoulders on the roll shaft 83 and the retaining ring 84, and the outer ring of the bearing 82 is fixed by the bearing seat 81 and the gland plate 85. In order to make the roll shaft 83 have a certain clearance during use, the outer rings of the bearings 82 at both ends of the roll shaft 83 adopt a structure form of one end fixed and one end with clearance.

[0045] Further, in the bending device for the head and tail of the strip steel of the present invention, the guide plate table 5 includes a table frame 51 fixed to the moving frame 22, a table top plate 52 arranged on the top of the table frame 51, a lining plate 53 arranged at the top end of the table top plate 52 through fasteners, and a support plate 54 arranged between the table top plate 52 and the table frame 51. By arranging the guide plate table 5, the impact force brought when the head and tail of the strip steel 9 move directly into the bending roll 8 can be avoided from damaging the roll surface of the bending roll 8. The guide plate table 5 frame uses a steel section with good rigidity as the manufacturing and processing basis, and a plurality of support plates 54 are welded at intervals in the width direction of the table frame 51 to strengthen the rigidity of the table frame 51 and increase the impact resistance of the structure. The table top plate 52 is designed at a preset angle along the running direction of the strip steel 9 to facilitate the head of the strip steel 9 with warping and unevenness to enter the bending device. In order to avoid the direct contact between the table top plate 52 and the surface of the strip steel 9, the lining plate 53 is installed on the table top plate 52 through countersunk head screws. Preferably, the lining plate 53 is made of nylon material, which not only protects the surface quality of the strip steel 9 but also facilitates the replacement of the lining plate 53 after the long-term use of the guide plate table 5, and prolongs the service life of the table top plate 52.

[0046] Further, in the bending device for the head and tail of the strip steel of the present invention, a first bushing 6 is sleeved between the first sleeve 28 and the first push rod 26, and the first bushing 6 is sleeved at both ends of the first push rod 26 respectively.

[0047] Further, in the bending device for the head and tail of the strip steel of the present invention, a second bushing 7 is sleeved between the second sleeve 42 and the second push rod 43, and the second bushing 7 is sleeved at both ends of the second push rod 43 respectively.

[0048] As a specific embodiment, in the bending device for the head and tail of the strip steel of the present invention, an oil nozzle 44 is provided on the second sleeve 42. The oil nozzle 44 communicates with the outer peripheral surface of the second push rod 43, and grease can be injected into the inside of the second sleeve 42 through the oil nozzle 44, increasing the lubricity of the equipment and improving the overall service life of the device.

[0049] Furthermore, in the bending device for the head and tail of the strip steel of the present invention, a support plate 29 is provided on the outer periphery of the first sleeve 28, and the support plate 29 is fixed to the connecting plate by fasteners.

[0050] As a specific embodiment, in the bending device for the head and tail of the strip steel of the present invention, the preset angle at which the first guide plate 12 inclines obliquely upward is 50° - 60°, and the preset angle at which the second guide plate 27 inclines obliquely downward is 25° - 30°. More specifically, the preset angle at which the first guide plate 12 inclines obliquely upward is 55°, and the preset angle at which the second guide plate 27 inclines obliquely downward is 27°. The first guide plate 12 and the second guide plate 27 are inclined to facilitate better cooperation with the bending roller 8 to bend the strip steel 9.

[0051] As a specific embodiment, in the bending device for the head and tail of the strip steel of the present invention, a reinforcing rib is provided between the first bending frame 11 and the first guide plate 12. Such a setting strengthens the rigidity of the first guide plate 12 and increases the impact resistance of the structure of the first bending assembly 1.

[0052] On the other hand, the bending method for the head and tail of the strip steel of the present invention is implemented by using the above-mentioned bending device, and specifically includes the following steps:

[0053] Step 1: The stainless steel annealing and pickling line can be divided into an entrance section, an entrance loop section, a furnace section, a central section, a pickling section, an exit loop section, and an exit section. When the strip steel 9 extends from the exit section and enters the exit turning pinch roll, through the cooperation of the detection device and the transmission structure, the head of the strip steel 9 is controlled to stay between the first guide plate 12 and the second guide plate 27;

[0054] Step 2: The lifting oil cylinder 3 is driven to move the moving rack 22 upward, thereby driving the bending roller 8 and the second bending frame 23 to move upward synchronously. At this time, the distance between the bending roller 8 and the second guide plate 27 remains the same as the initial position. As the moving rack 22 is lifted upward, the upper roller surface of the bending roller 8 contacts the bottom surface of the strip steel 9, and the top surface of the second guide plate 27 contacts the bottom surface of the strip steel 9;

[0055] Step 3: The lifting oil cylinder 3 continues to drive the moving frame 22 to lift upward, and the strip steel 9 also gradually starts to be clamped under the clamping of the first guide plate 12 and the second guide plate 27. The bending roller 8 and the strip steel 9 it supports can continue to move upward with the moving frame 22. Since the first guide plate 12 is fixed to the first bending frame 11, as the second guide plate 27 continues to rise until the first guide plate 12, the strip steel 9, and the second guide plate 27 are in mutual contact, then the moving frame 22 drives the first sleeve 28 to continue to rise, the spring 25 starts to be compressed, and applies an upward pressure to the second bending frame 23. At this time, the first guide plate 12, the second guide plate 27, and the part of the strip steel 9 clamped between them are all in a static state, while the strip steel 9 on the bending roller 8 contacts the part of the first guide plate 12 that slopes obliquely upward to form a bending state;

[0056] Step 4: After the tail of the strip steel 9 undergoes the above steps 1 to 3, it can form a bending state. The head of the bent strip steel 9 is more convenient to smoothly enter the jaws for coiling. The tail of the bent strip steel 9 is not easy to cut the bundling tape during bundling, avoiding the occurrence of the bandage phenomenon.

[0057] In summary, compared with the prior art, the bending device and method for the head and tail of strip steel of the present invention have the following advantages and positive effects:

[0058] (1) By setting the first bending assembly 1 and the second bending assembly 2, and cooperating with the synergistic action of the lifting oil cylinder 3 and the guiding assembly 4, the present invention realizes the effective bending of the head and tail of the strip steel 9, not only improving the bending accuracy and efficiency, but also reducing the operation difficulty, making the whole bending process more stable and reliable. During the bending process, the position of the strip steel 9 is monitored in real time through the detection module, ensuring the accuracy and timeliness of bending, and significantly improving the automation level and production efficiency of the annealing and pickling treatment line of the stainless steel strip steel 9;

[0059] (2) In the present invention, the first push rod 26 and the second push rod 43 are respectively guided and supported through the first sleeve 28 and the second sleeve 42, and a spring 25 and an adjusting nut 24 are arranged on the outer periphery of the first push rod 26. The distance between the second bending frame 23 and the first sleeve 28 can be adjusted according to actual needs, so as to adapt to the bending requirements of strip steel 9 with different thicknesses and materials, having good adaptability. And through the setting of the guiding assembly 4, the stability and service life of the equipment are also increased, and the first guide plate 12 and the second guide plate 27 are respectively inclined at a preset angle obliquely upward and obliquely downward, which is convenient to cooperate with the bending roller 8 to better bend the strip steel 9, improving the bending effect and having good practicability.

[0060] It should be noted that in this text, unless otherwise clearly defined and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood according to specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. In addition, in this text, "front", "rear", "left", "right", "up" and "down" are all referenced with the placement state shown in the drawings.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bending device for the head and tail of a strip, the bending device is arranged between an outlet steering pinch roller and an outlet section, the outlet steering pinch roller is provided with a pinch roller frame, and a detection module is arranged on the pinch roller frame, characterized in that: The bending device includes a first bending assembly fixed to one side of the pinch roller frame, a second bending assembly arranged below the first bending assembly, a lifting cylinder arranged below the second bending assembly, and a plurality of guide assemblies arranged on both sides of the lifting cylinder, wherein: The first bending assembly includes a first bending frame fixed to one side of the pinch roller frame, and a first guide plate vertically arranged below the first bending frame, wherein the first guide plate is inclined upward at a preset angle near one end of the outlet section; The second bending assembly includes a first fixed frame fixed to one side of the pinch roller frame, a mobile frame arranged above the first fixed frame, and a second bending frame arranged between the mobile frame and the pinch roller frame, a guide plate platform is arranged above the mobile frame, a bending roller is arranged between the guide plate platform and the second bending frame, and the bending roller is fixed above the mobile frame; A first push rod is connected to the lower part of the second bending frame, and a second guide plate is connected to the upper part. The second guide plate is inclined downward at a preset angle close to one end of the pinch roller frame. The mobile frame is fixedly connected to a first sleeve through a connecting plate. The first push rod is loosely fitted in the first sleeve. A spring is further arranged on the outer periphery of the first push rod. The spring is located between the second bending frame and the first sleeve. An adjusting nut is threadedly connected to the outer periphery of one end of the first push rod away from the second bending frame. The guide assembly comprises a guide frame fixed to the inner side of the first fixed frame, a second sleeve is arranged at one end of the guide frame, a second push rod is sleeved in the second sleeve, and a top end of the second push rod is connected to the bottom of the mobile frame; One end of the jacking oil cylinder is connected to one side of the pinch roller frame through a second fixed frame, and the other end is connected to the bottom of the mobile frame.

2. The bending device for the head and tail of a strip according to claim 1, characterized in that: The bending roller includes two bearing seats symmetrically fixed on the top of the movable frame, bearings embedded in the bearing seats, roller shafts with two ends respectively sleeved on the bearings, retaining rings arranged on the outside of the bearings, and pressure covers arranged on the outside of the bearing seats.

3. The bending device for the head and tail of a strip according to claim 1, characterized in that: The guide plate platform includes a platform fixed on the mobile frame, a platform panel arranged on the top of the platform, a lining plate arranged on the top of the platform panel through fasteners, and a support plate arranged between the platform panel and the platform.

4. The bending device for the head and tail of a strip according to claim 1, characterized in that: A first bushing is sleeved between the first sleeve and the first push rod, and the first bushing is sleeved on both ends of the first push rod respectively.

5. The bending device for the head and tail of a strip according to claim 1, characterized in that: A second bushing is sleeved between the second sleeve and the second push rod, and the second bushing is sleeved on both ends of the second push rod respectively.

6. The bending device for the head and tail of a strip according to claim 1, characterized in that: The second sleeve is provided with an oil nozzle, and the oil nozzle is connected to the outer peripheral surface of the second push rod.

7. The bending device for the head and tail of a strip according to claim 1, characterized in that: A support plate is arranged on the outer periphery of the first sleeve, and the support plate is fixed to the connecting plate.

8. The bending device for the head and tail of a strip according to claim 1, characterized in that: The preset angle at which the first guide plate is inclined upward is 50° to 60°, and the preset angle at which the second guide plate is inclined downward is 25° to 30°.

9. The bending device for the head and tail of a strip according to claim 1, characterized in that: A reinforcing rib is arranged between the first bending frame and the first guide plate.

10. A method for bending the head and tail of a steel strip, the method being implemented using the bending device according to any one of claims 1 to 9, comprising: Step 1: When the strip steel extends from the outlet section and enters the outlet turning pinch roller, the detection device controls the head of the strip steel to stay between the first guide plate and the second guide plate; Step 2: The movable frame is driven to move upward by the lifting cylinder, thereby driving the bending roller and the second bending frame to move upward synchronously. As the movable frame is lifted upward, the upper roller surface of the bending roller contacts the bottom surface of the steel strip, and the top surface of the second guide plate contacts the bottom surface of the steel strip; Step 3: The lifting cylinder continues to drive the movable frame to lift upward, and the strip steel also gradually begins to be clamped by the first guide plate and the second guide plate. The bending roller and the strip steel supported by it can continue to move upward with the movable frame. At this time, the first guide plate and the second guide plate and the part of the strip steel clamped therebetween are all in a stationary state, and the strip steel on the bending roller contacts the part of the first guide plate inclined obliquely upward to form a bending state; Step 4: The tail of the strip can be bent after the above steps 1 to 3.

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