Device and method for lifting and cooling intermediate billet

Abstract

The invention discloses an intermediate billet lifting and cooling device and method. Comprising supporting frames located on the two sides of a roller way. The upper ends of the two supporting frames are connected through a connecting frame. A lifting frame is arranged between the supporting frames; a driving device used for driving the lifting frame to ascend and descend is arranged on the supporting frame and corresponds to the lifting frame. The lifting frame is composed of lifting main beams located on the two sides and a plurality of lifting cross beams arranged between the two lifting main beams at intervals. The lifting main beam and the lifting cross beam are each of a double-layer box beam structure, and cooling water is introduced into the lifting main beam and the lifting cross beam. The device adopts a modular design, can be flexibly arranged at any position or multiple positions of a rolling mill area according to the requirements of a controlled rolling and controlled cooling process, and is particularly suitable for later transformation. The automatic steel supporting and locking device has the advantages of automatic steel supporting, reliable locking, capability of meeting cross rolling requirements, effective improvement of production efficiency, increase of machine-hour yield and reduction of production cost.

Description

Technical Field

[0001] The present invention relates to an intermediate billet lifting and cooling device and method. Background Art

[0002] The equipment in the rolling mill area is an important process equipment in the steel rolling production line, and its function is to roll the billet into shape. For the medium and heavy plate rolling process, generally 1 - 2 roughing mills R1 - R2 are set up to perform several passes of rough rolling on the billet to form an intermediate billet, and then enter the finishing mill for finishing rolling. In order to meet the requirements of the strong and tough properties of the thick plate, the controlled rolling and controlled cooling processes are mainly adopted. According to the requirements of the controlled rolling process, when the slab is rolled into an intermediate billet of a certain thickness, a set of cooling devices need to be set up to cool the intermediate billet rolled by the roughing mill unit. The cooling process usually adopts air cooling on the output roller table or sets up a separate accelerated cooling (ACC) device for spraying water / aerosol cooling. When the rolling start temperature of the second or third stage of the controlled rolling is reached, it enters the rolling mill for the next stage of rolling.

[0003] The early medium and heavy plate rolling lines mainly had the following problems:

[0004] 1. For the early layout, the rolled intermediate billets often stayed on the roller table for a long time for temperature holding and natural cooling. On the one hand, it caused the baking of the surrounding roller table and other equipment by the high-temperature steel billets. On the other hand, the subsequent steel billets had to stop and wait, thus affecting the output of the rolling line. At the same time, in some double-stand production modes, the original position of the intermediate cooling equipment was often close to the finishing mill, and the space required for the intermediate cooling process overlapped with the space required for the finishing mill rolling, resulting in that the intermediate cooling could not cool the intermediate billets after rough rolling in time, and the cooling process affected the finishing mill rolling, causing interference in production.

[0005] 2. In the past, a spray-type intermediate cooling device was often set between the roughing and finishing mills. Through this device, the cooling of the intermediate billets was accelerated, the temperature holding time between roughing and finishing was reduced, and the production efficiency was improved. However, the problems of the intermediate cooling device are: the specially set intermediate cooling device occupies a certain space and requires a certain cooling time, and the temperature control is only limited to one position, that is, between roughing and finishing, and it is more difficult to retrofit and reconstruct later.

[0006] 3. Cross-rolling problem. There is a certain starting rolling temperature and final rolling temperature in each rolling stage. Therefore, there is a problem of intermediate cooling and temperature waiting between each stage. The length of the intermediate cooling time mainly depends on the intermediate thickness of the rolled piece. The greater the intermediate thickness, the longer the placement time of the rolled piece on the roller table. When the rolling mill only rolls one slab, the intermediate cooling and temperature waiting of the rolled piece will cause a significant decrease in the output of the rolling mill. If other rolled pieces are rolled by the rolling mill during the intermediate cooling period of the rolled piece, it will obviously increase the output of the rolling mill. By adopting cross-rolling, the intermediate cooling time of the rolled piece can be fully utilized to let the rolling mill roll other rolled pieces, so as to achieve the purpose of increasing the output of the rolling mill. Summary of the Invention

[0007] To overcome the above defects, the purpose of the present invention is to provide an intermediate billet lifting and cooling device and method.

[0008] To achieve the above purpose, the intermediate billet lifting and cooling device of the present invention includes:

[0009] Support frames located on both sides of the roller table; the upper ends of the two support frames are connected by a connecting frame;

[0010] A lifting frame is arranged between the support frames;

[0011] A driving device for driving the lifting frame to lift and lower is arranged on the support frame corresponding to the lifting frame;

[0012] Among them, the lifting frame is composed of lifting main beams located on both sides and a number of lifting cross beams arranged at intervals between the two lifting main beams; both the lifting main beams and the lifting cross beams adopt a double-layer box girder structure, and cooling water is introduced into them.

[0013] Further, a locking device is arranged on the support frame at a predetermined height corresponding to the lifting frame.

[0014] Further, the locking device is a pin hydraulic cylinder; a first connecting bracket is arranged on the side of the lifting main beam near the connecting frame corresponding to the pin hydraulic cylinder; a guide sleeve is arranged on the first connecting bracket corresponding to the pin hydraulic cylinder. After the piston rod of the pin hydraulic cylinder is inserted into the guide sleeve, the lifting frame can be locked.

[0015] Further, a second connecting bracket is also arranged on the side of the lifting main beam near the connecting frame;

[0016] The lifting main beam is hinged to the driving device through the second connecting bracket.

[0017] Further, a third connecting bracket is also arranged on the side of the lifting main beam near the connecting frame; a guide roller device is arranged between the lifting main beam and the third connecting bracket.

[0018] Furthermore, a plurality of fourth connection brackets are correspondingly arranged on the two lifting main beams; the lifting main beam and the lifting cross beam are hinged through the fourth connection brackets.

[0019] To achieve the above object, a method for lifting and cooling an intermediate billet according to the present invention is realized by using the above device and includes the following steps:

[0020] Arrange the intermediate billet lifting and cooling device at the original rolling mill roller table and span the entire roller table;

[0021] After the steel billet is rolled by the roughing mill, it is transported to the intermediate billet lifting and cooling device through the roller table. The lifting frame lifts the intermediate billet from the roller table and performs natural cooling in the air; it is cooled to the required rolling temperature;

[0022] During the process of the lifting cross beam of the lifting frame lifting the steel billet and performing natural cooling, the lower roller table can still rotate, which does not affect the rolling of subsequent steel billets;

[0023] When the cooling is completed, the hydraulic cylinder of the driving device retracts, and the lifting cross beam descends to the low position. At this time, the top surface of the lifting cross beam is flush with the original roller table surface, and at this time, the steel billet can be sent to the subsequent rolling mill for rolling through the roller table.

[0024] The present invention has the following advantages:

[0025] 1. Adopt a steel billet supporting structure. On the one hand, when the first intermediate billet needs to be cooled, the lifting device lifts the steel billet from the rolling line roller table, separates it from the roller table surface, and performs natural cooling. On the other hand, the subsequent second steel billet can still be rolled, without conflict with each other.

[0026] 2. Adopt a gantry frame structure. The device can span the entire roller table, make full use of space, have a small floor area, make small modifications to the original equipment, fully consider the installation convenience, as well as the maintenance and disassembly convenience of adding this equipment. It is especially suitable for the upgrade and transformation of existing rolling line equipment. The equipment adopts automatic and manual control operations and is incorporated into the original rolling mill system.

[0027] 3. Adopt a double-layer box girder water-cooling structure. The main stress components such as the lifting frame and the connection frame all adopt a double-layer box girder structure, and circulating cooling water is introduced for effective cooling. It can realize the parking and natural cooling of high-temperature intermediate billets for a long time and ensure the reliability of the equipment.

[0028] 4. Adopt a hydraulic pin cylinder locking structure. It can achieve reliable locking, and it is easy to realize automatic operation in cooperation with the detection device, avoiding on-site manual operation and improving safety. The main lifting is hydraulically driven and has automatic control and manual control functions.

[0029] 5. The lifting of the lifting frame adopts a "groove roller + flat roller" arrangement. It can perform effective positioning while lifting with load.

[0030] 6. The device is of a combined design. According to the length of the intermediate billet, one set or two sets are arranged in series. The two lifting devices can realize the functions of single-set lifting and two-set synchronous lifting, and are used for lifting the slab in the roller table.

[0031] 7. The device is of a modular design and can be flexibly set at any position or multiple positions in the rolling mill area according to the requirements of the controlled rolling and controlled cooling process, especially suitable for later transformation. It has automatic steel supporting and reliable locking, can meet the requirements of cross rolling, effectively improve production efficiency, increase the hourly output, and reduce production costs. The device consists of eight parts: conveying roller table, lifting frame, guiding roller device, connecting frame, locking device, driving device, support frame, and machine base. It has a simple structure and is easy to operate and maintain, especially suitable for the upgrading and transformation of traditional heavy and wide plate rolling lines. At present, the device has been used normally in domestic steel mills. Description of the Drawings

[0032] Figure 1 is the external view of an intermediate billet lifting and cooling device of the present invention.

[0033] Figure 2 is the external view of the lifting frame.

[0034] Figure 3 is the external view of the guiding roller device; among them, (a) is the schematic diagram of the flat roller, and (b) is the schematic diagram of the grooved roller.

[0035] Figure 4 is the external view of the connecting frame.

[0036] Figure 5 is the external view of the assembly relationship of the connecting frame.

[0037] Figure 6 is the external view of the locking device.

[0038] Figure 7 is the installation schematic diagram of the intermediate billet lifting and cooling device.

[0039] Figure 8 is the schematic diagram of the intermediate billet lifting action.

[0040] Figure 9 is Figure 8 the A-A sectional view schematic diagram of. Among them, (a) is the locking state diagram; (b) is the locking open state diagram.

[0041] Figure 10 is the schematic diagram of the typical characteristics of the intermediate billet lifting and cooling device.

[0042] The above figures include: 100 - lifting frame, 200 - guiding roller device, 300 - connecting frame, 400 - locking device, 500 - driving device, 600 - supporting frame, 700 - machine base; 101 - lifting main beam, 102 - first connecting bracket, 103 - second connecting bracket, 104 - lifting cross beam, 105 - third connecting bracket, 106 - backing plate, 107 - fourth connecting bracket; 201 - first roller box, 202 - first guide roller, 203 - second roller box, 204 - second guide roller; 301 - first connecting beam, 302 - second connecting beam, 303 - third connecting beam; 401 - pin cylinder block, 402 - piston rod. Detailed implementation manner

[0043] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0045] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] As Figure 1 shown, it is the external view of the whole set of intermediate billet lifting and cooling device, and this device is composed of seven parts: a lifting frame (100), a guiding roller device (200), a connecting frame (300), a locking device (400), a driving device (500), a supporting frame (600), and a machine base (700).

[0048] As Figure 2As shown in the figure, the lifting frame (100) consists of a lifting main beam (101), a first connecting bracket (102), a second connecting bracket (103), a lifting cross beam (104), a third connecting bracket (105), a backing plate (106), a fourth connecting bracket (107), etc. On the one hand, the lifting main beam (101) is hinged to the locking device (400) through the first connecting bracket (102); the lifting main beam (101) is hinged to the driving device (500) through the second connecting bracket (103); the lifting main beam (101) is hinged to the guide roller device (200) through the third connecting bracket (105); the lifting main beam (101) is hinged to the lifting cross beam (104) through the fourth connecting bracket (107). On the other hand, both the lifting main beam (101) and the lifting cross beam (104) adopt a double-layer box girder structure and are supplied with cooling water. The backing plate (106) is made of high-temperature resistant material and is directly welded to the lifting cross beam (104). The above-mentioned lifting main beam, etc. are arranged symmetrically on both sides.

[0049] As Figure 3 shown in the figure, the guide roller device (200) consists of a roller box and guide rollers. The guide rollers are divided into two structural forms: flat rollers and grooved rollers, which are respectively arranged at the front and rear ends of the lifting frame. The guide roller device (200) ensures the stable lifting of the lifting frame (100), plays a positioning and guiding role, and can effectively avoid shaking.

[0050] As Figure 4 shown in the figure, the connecting frame (300) consists of a first connecting beam (301), a second connecting beam (302), a third connecting beam (303), etc. As Figure 5 shown in the figure, on the one hand, the first connecting beam (301) and the second connecting beam (302) are connected to the support frame (600), and the 4 sets of support frames (600) are connected into a firm quadrilateral integral structure. The third connecting beam (303) connects the left and right lifting main beams (101) into a whole to form a quadrilateral frame, and at the same time cancels out the lateral forces of the left and right lifting main beams (101) with each other. The first connecting beam (301), the second connecting beam (302), and the third connecting beam (303) all adopt a double-layer box girder structure and are supplied with cooling water to avoid deformation during high-temperature baking.

[0051] As Figure 5 shown in the figure, the bottom of the support frame (600) is connected to the machine base (700). A guide roller device (200) track is provided on the back of the support frame (600), and the driving device (500) pushes the lifting frame (100) to move up and down on the track. A locking device (400) ( Figure 6 ) is installed inside the box body of the support frame (600). Mounting surfaces are provided at the outer end and the top of the support frame (600) for connection with the connecting frame (300).

[0052] AsFigure 6 As shown, the locking device (400) is a structure of a bolt - type hydraulic cylinder. The locking device (400) consists of a cylinder barrel (401) and a piston rod (402). The locking device (400) is fixed on the support frame (600) through bolts and step surfaces. When the lifting frame (100) lifts the intermediate billet to a high position, at this time, the rodless cavity of the locking device (400) is filled with oil, and the piston rod (402) extends and inserts into the guide sleeve of the lifting frame (100) for locking. When the lifting frame (100) descends, the rod - end cavity is filled with oil, the piston rod retracts, and the locking is released. 4 sets or more locking devices (400) can be set according to needs.

[0053] The driving device (500) is composed of 4 groups or more groups of hydraulic cylinders, symmetrically arranged on both sides. One end of the hydraulic cylinder is connected to the lifting main beam (101) of the lifting frame, and the middle is hinged to the machine base (700). When the hydraulic cylinder extends, it can evenly lift the lifting frame (100) up or down.

[0054] The machine base (700) is used to support the driving device (500) and the support frame (600), and is fixed on the foundation through anchor bolts.

[0055] As Figure 7 shown, the intermediate billet lifting and cooling device is arranged at the original rolling mill roller table. During installation, it can span the entire roller table, with little or no modification to the original roller table and other equipment. Therefore, it is especially suitable for the upgrading and transformation of traditional heavy and wide plate rolling lines. Determine the effective length L2 of the lifting frame according to the actual length L1 of the rolled intermediate billet. Determine the lifting height H and cooling time of the intermediate billet according to the requirements of the controlled rolling and cooling process. Determine the span L4 of the support frame (600) according to the width L3 of the original roller table.

[0056] As Figure 8 and Figure 9 shown, according to the requirements of the controlled rolling and controlled cooling process, after the steel billet is rolled by the roughing mill, it is transported to the intermediate billet lifting and cooling device through the roller table. The lifting frame (100) lifts the intermediate billet from the roller table and conducts natural cooling in the air. Intermediate billets of different steel grades, different thicknesses, and different incoming material temperatures can reach the purpose of cooling to the required rolling temperature according to different air - staying times, so as to produce rolled materials with the required mechanical properties. During the process of the lifting cross - beam (104) lifting the steel billet and natural cooling, the lower roller table can still rotate, without affecting the rolling of subsequent steel billets.

[0057] After cooling is completed, the hydraulic cylinder of the driving device (500) retracts, and the lifting cross - beam (104) descends to a low position. At this time, the top surface of the lifting cross - beam (104) is lower than the original roller table surface. At this time, the steel billet can be sent to the subsequent rolling mill for rolling through the roller table.

[0058] Furthermore, several backing plates welded to the top of the lifting crossbeam (104) are lower than the roll surface. When supporting the steel, they play a role in heat insulation and protection, and when in the low position, they act as a guiding plate for the bottom of the billet.

[0059] Figure 10 This is a description of the typical features of the intermediate billet lifting and cooling device of this apparatus.

[0060] This intermediate billet lifting and cooling device can effectively solve the problems of steel plate overlap in finish rolling and the inability to carry out finish rolling and intermediate cooling simultaneously, and fully exerts the role of intermediate cooling in reducing the waiting time and increasing the hourly output. It is especially suitable for the upgrading and transformation of traditional heavy plate rolling lines.

[0061] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be regarded as within the protection scope of the present invention.

[0062] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0063] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An intermediate billet lifting and cooling device, characterized in that, Comprising: Support frames located on both sides of the roller table; The upper ends of the two support frames are connected by a connecting frame; A lifting frame is arranged between the support frames; A driving device for driving the lifting frame to lift and lower is arranged on the support frames corresponding to the lifting frame; Wherein, the lifting frame is composed of lifting main beams located on both sides and a plurality of lifting cross beams arranged at intervals between the two lifting main beams; both the lifting main beams and the lifting cross beams adopt a double-layer box girder structure, and cooling water is introduced therein.

2. The intermediate billet lifting and cooling device according to claim 1, wherein A locking device is arranged on the support frames at a predetermined height in the upper section corresponding to the lifting frame.

3. The intermediate blank lifting and cooling device according to claim 2, wherein, The locking device is a pin hydraulic cylinder; a first connecting bracket is arranged on the side of the lifting main beam near the connecting frame corresponding to the pin hydraulic cylinder; a guide sleeve is arranged on the first connecting bracket corresponding to the pin hydraulic cylinder, and after the piston rod of the pin hydraulic cylinder is inserted into the guide sleeve, the lifting frame can be locked.

4. An intermediate blank lifting and cooling device according to claim 1, characterized in that, A second connecting bracket is further arranged on the side of the lifting main beam near the connecting frame; The lifting main beam and the driving device are hinged through the second connecting bracket.

5. The intermediate blank lifting and cooling device according to claim 1, wherein, A third connecting bracket is further arranged on the side of the lifting main beam near the connecting frame; a guide roller device is arranged between the lifting main beam and the third connecting bracket.

6. The intermediate blank lifting and cooling device according to claim 1, characterized in that, A plurality of fourth connecting brackets are correspondingly arranged on the two lifting main beams; the lifting main beam and the lifting cross beam are hinged through the fourth connecting bracket.

7. A method for lifting and cooling an intermediate billet, wherein the method is implemented by using the device as described in claim 1, characterized in that, Comprising the following steps: Arrange the intermediate billet lifting and cooling device at the original rolling mill roller table and span the entire roller table; After the steel billet is rolled by the roughing mill, it is transported to the intermediate billet lifting and cooling device through the roller table, and the intermediate billet is lifted from the roller table by the lifting frame for natural cooling in the air; Cool to the required rolling temperature; During the process of the lifting cross beam of the lifting frame lifting and naturally cooling the steel billet, the lower roller table can still rotate, without affecting the rolling of subsequent steel billets; When the cooling is completed, the hydraulic cylinder of the driving device retracts, and the lifting cross beam descends to the low position. At this time, the top surface of the lifting cross beam is flush with the original roller table surface, and at this time, the steel billet can be sent to the subsequent rolling mill for rolling through the roller table.

Images