An auxiliary feeding and automatic centering device for short slab rolling

Abstract

This invention relates to an auxiliary feeding and automatic centering device for short slab rolling, comprising a process roller table, an auxiliary roller table, a pinch roll device, and a centering device. The process roller table is located at the mill entrance, and the auxiliary roller table is located between the process roller table and the upstream slab conveying roller table. This invention employs a structure of a transversely moving auxiliary roller table combined with a longitudinally moving process roller table, allowing the process roller table to be as close as possible to the roll guide device, facilitating mill gripping. Simultaneously, tension-free feeding is achieved by utilizing the power gained by the slab on the process roller table, improving rolling accuracy. A centering device driven by a swing hydraulic cylinder is installed on the process roller table to prevent slab deviation during rolling, improving feeding accuracy. The overall structure of the device is simple, its performance is stable and reliable, realizing mechanized feeding and centering, eliminating safety hazards caused by manual operation, and contributing to improved rolling efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel rolling, in particular to an auxiliary feeding and automatic centering device for short slab rolling. BACKGROUND

[0002] The auxiliary feeding and automatic centering device applied to the inlet or outlet of a rolling mill generally consists of a process roller, an auxiliary roller, a pinch roll, a guide device and the like, which together realize accurate feeding of the blank and cooperate with the rolling mill to perform rolling (including reciprocating rolling). When the rolls are changed, the auxiliary roller is withdrawn from the rolling line, and the process roller is withdrawn from the rolling mill window, so that the work roll system is moved out of the rolling mill.

[0003] The cold rolling special steel production line usually rolls short blanks of 600-1000 mm, which cannot establish tension, resulting in difficulty in biting the steel of the rolling mill and smooth rolling. At present, the artificial assisted feeding mode is mostly used, which is high in labor intensity, high in danger and low in production efficiency. Even if the feeding is performed by increasing the line speed of the front and rear work rollers to increase the inertia of the blank at the inlet of the rolling mill, there are still problems such as failure to bite the steel smoothly or unqualified rolling product specifications.

[0004] The Chinese patent application with the application number 201811086772.6 discloses a "frame roller for conveying short blanks by a metal plate rolling mill", which comprises left and right bearing seats, first to sixth flower rollers, first to sixth main gears and first to fifth transmission gears mounted on the left and right mill frames. The structure is that the first to sixth flower rollers are respectively and sequentially installed in the bearing holes in the left and right bearing seats, the left ends of the first to sixth flower rollers are respectively and sequentially provided with the first to sixth main gears, the first to fifth transmission gears are respectively and sequentially installed in the left bearing seat and respectively and sequentially meshed with the first to sixth main gears, and the right end of the first flower roller is connected with the motor through a transmission shaft and a coupling. For the case of rolling short blanks (the shortest blank length is 350 mm), when the short blanks need to be conveyed, the motor is started to drive the first flower roller and the first main gear to rotate, further driving each transmission gear and the main gear and each flower roller to rotate alternately, so as to achieve the purpose of conveying the short blanks. However, the fixed installation mode is not conducive to roll changing operation.

[0005] Under normal circumstances, there are two installation modes of the pinch roll of the rolling mill, one is to fix the pinch roll by opening a pinch roll installation hole in the rolling mill frame, which will seriously weaken the strength of the rolling mill frame; the other is to set the pinch roll of the rolling mill far away from the rolling line, but it cannot play a pinch role for short blanks and there is a problem of poor clamping for long blanks, which further affects the rolling quality. At the same time, due to structural limitations, the fixed guide plates are arranged in the rolling mill frame in the past, the opening degree of the roller cannot be adjusted in real time, and the position accuracy of the blank entering the rolling mill cannot be guaranteed. SUMMARY

[0006] The application provides an auxiliary feeding and automatic centering device for short slab rolling, which adopts a structure of a transversely moving auxiliary roller way cooperating with a longitudinally moving process roller way, so that the process roller way can be maximally close to a roller guide device, and the rolling mill can easily bite the steel; meanwhile, the device realizes tension-free feeding by the power obtained by the slab on the process roller way, and improves the rolling precision; the process roller way is provided with a centering device driven by a swing hydraulic cylinder, so as to avoid slab deviation during rolling, and improve the feeding accuracy; the device has simple overall structure, stable and reliable performance, realizes mechanized feeding and centering, eliminates the safety hidden trouble caused by manual operation, and is beneficial to improving the rolling efficiency.

[0007] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0008] The application provides an auxiliary feeding and automatic centering device for short slab rolling, which adopts a structure of a transversely moving auxiliary roller way cooperating with a longitudinally moving process roller way, so that the process roller way can be maximally close to a roller guide device, and the rolling mill can easily bite the steel; meanwhile, the device realizes tension-free feeding by the power obtained by the slab on the process roller way, and improves the rolling precision; the process roller way is provided with a centering device driven by a swing hydraulic cylinder, so as to avoid slab deviation during rolling, and improve the feeding accuracy; the device has simple overall structure, stable and reliable performance, realizes mechanized feeding and centering, eliminates the safety hidden trouble caused by manual operation, and is beneficial to improving the rolling efficiency.

[0009] Further, the process roller way is composed of a roller changing guide rail, a roller assembly one, a supporting seat, a moving hydraulic cylinder, a roller frame one, a base and a supporting beam; the supporting beam is fixedly connected with a rolling mill rack, the base is arranged on the outside of the rolling mill rack, and the supporting seat is supported by the supporting beam and the base; the roller assembly one is installed on the supporting seat through the roller frame one, one end of the moving hydraulic cylinder is connected with the base, and the other end is connected with the supporting seat; the roller changing guide rail is arranged at one end of the roller frame one close to the rolling mill, and the roller changing guide rail is provided with a nozzle mounting hole for cooling a working roller.

[0010] Further, the roller device one is composed of a speed reduction motor one, a shaft coupling one, a free roller assembly one, a transmission roller assembly one, a roller chain one and a chain tensioning device one; the speed reduction motor one is connected with the transmission roller assembly one through the shaft coupling one, the free roller assembly one is connected with the transmission roller assembly one through the roller chain one, and the roller chain one is provided with the chain tensioning device one; the free roller one in the free roller assembly one rotates synchronously with the transmission roller one in the transmission roller assembly one.

[0011] Further, the auxiliary roller table is composed of a horizontal moving hydraulic cylinder, a supporting base, a roller frame two, a roller assembly two, a horizontal moving base, a rolling linear guide and a pad plate; one end of the supporting base is connected with the base of the process roller table, and the other end is fixed on the ground; the top of the supporting base is provided with the pad plate; the bottom of the horizontal moving base is provided with the rolling linear guide and moves along the pad plate through the rolling linear guide; the roller assembly two is installed on the horizontal moving base through the roller frame two; one end of the horizontal moving hydraulic cylinder is connected with the horizontal moving base, and the other end is connected with the supporting base; the outer side of the auxiliary roller table is respectively provided with proximity switches at corresponding working positions and roll changing positions.

[0012] Further, the roller assembly two is composed of a speed reducer two, a coupling two, a free roller assembly two, a transmission roller assembly two, a roller chain two and a chain tensioning device two; the speed reducer two is connected with the transmission roller assembly two through the coupling two, the free roller assembly two is connected with the transmission roller assembly two through the roller chain two, and the roller chain two is provided with the chain tensioning device two; the free roller two in the free roller assembly two rotates synchronously with the transmission roller two in the transmission roller assembly two.

[0013] Further, the pinch roll device comprises a cross beam, a hydraulic cylinder, a pressure roller, a guide column and a pressure roller support; the cross beam is fixedly connected with the corresponding side wall of the rolling mill frame, the hydraulic cylinder is installed on the cross beam, the push rod of the hydraulic cylinder is connected with the pressure roller support, the pressure roller support is L-shaped, the bottom end extends to the rolling mill direction, and the pressure roller is installed on the extended end of the pressure roller support; the guide column is arranged between the hydraulic cylinder and the pressure roller support and is used for guiding the push rod of the hydraulic cylinder; a material detection switch is arranged on one side of the process roller table below the pinch roll device and is used for detecting the slab.

[0014] Further, the centering device comprises a swing hydraulic cylinder, a centering guide plate, a rack, a gear shaft, a centering frame and a guide wheel; the swing hydraulic cylinder is arranged on the supporting base of the process roller table and is used for driving the gear shaft to rotate; the gear shaft is in meshing transmission with two parallel racks; the outer ends of the two racks are respectively provided with the centering frame, the centering guide plate is arranged on the centering frame, and the guide wheel is arranged on the centering guide plate.

[0015] Further, a displacement sensor is arranged on the outer side of the centering guide plate; guide columns are arranged on the two sides of the roller frame one of the process roller table and are used for guiding when the rack moves.

[0016] Further, the rolling mill is a one-way rolling mill, and the process roller table, the auxiliary roller table, the pinch roll device and the centering device are arranged only on the inlet side of the rolling mill.

[0017] Further, the rolling mill is a reversible rolling mill, and the process roller table, the auxiliary roller table, the pinch roll device and the centering device are arranged at the front side inlet of the rolling mill and the rear side inlet of the rolling mill.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] 1) the structure of the transverse moving auxiliary roller and the longitudinal moving process roller makes the process roller close to the roller guide device to the maximum, which is convenient for the steel biting of the rolling mill;

[0020] 2) the no-tension feeding is realized by the power obtained by the blank on the process roller, which improves the rolling precision;

[0021] 3) the centering device driven by the swing hydraulic cylinder is arranged on the process roller, which can guide the blank at the entrance of the rolling mill, avoids the deviation of the plate during rolling, and improves the feeding accuracy;

[0022] 4) the pinch roller device is arranged on the process roller, and the whole adopts the L-shaped structure, which ensures that the pressure roller is as close to the center line of the roller as possible during rolling, and is convenient for feeding;

[0023] 5) the process roller can be used as the rack roller of the rolling mill. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structure diagram of the auxiliary steel feeding and automatic centering device for short plate blank rolling Figure 1 .

[0025] Figure 2 is a top view of Figure 1 .

[0026] Figure 3 is a structure diagram of the auxiliary steel feeding and automatic centering device for short plate blank rolling Figure 2 .

[0027] Figure 4 is a top view of Figure 3 (not including the auxiliary roller and the pinch roller device except the supporting base).

[0028] Figure 5 is a left view of Figure 3 .

[0029] Figure 6 is a structure diagram of the auxiliary roller.

[0030] Figure 7 is a top view of Figure 6 .

[0031] Figure 8 is a right view of Figure 6 .

[0032] Figure 9 is a structure diagram of the centering device.

[0033] In the diagram: 1. Rolling mill stand; 2. Process roller conveyor; 21. Roll changing guide rail; 22. Roll conveyor assembly one; 23. Support base; 24. Moving hydraulic cylinder; 25. Roll conveyor frame one; 26. Base; 27. Support beam; 3. Auxiliary roller conveyor; 31. Transverse hydraulic cylinder; 32. Support base; 33. Roll conveyor frame two; 34. Roll conveyor assembly two; 35. Transverse base; 36. Rolling linear guide rail; 37. Pad plate; 4. Centering device; 41. Centering guide plate; 42. Centering frame; 43. Rack; 44. Gear shaft; 45. Swinging hydraulic cylinder; 46. Guide wheel; 5. Pinch roll device. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0035] like Figures 1-9 As shown, the auxiliary feeding and automatic centering device for short slab rolling according to the present invention includes a process roller table 2, an auxiliary roller table 3, a pinch roll device 5, and a centering device 4; the process roller table 2 is located at the mill inlet, and the auxiliary roller table 3 is located between the process roller table 2 and the upstream slab conveying roller table of the mill; the process roller table 2 can switch between the rolling working position and the roll changing working position; the auxiliary roller table 3 can switch between the working position and the roll changing position; when the upstream slab conveying roller table, the auxiliary roller table 3, and the process roller table 2 are connected in sequence, the process roller table... 2 is in the rolling working position, and the auxiliary roller table 3 is in the working position; when changing rolls, the auxiliary roller table 3 moves laterally to the roll changing position outside the process roller table 2, and the process roller table 2 moves away from the rolling mill to the roll changing working position; the pinch roll device 5 is located above the process roller table 2 near the mill entrance, and the pinch roll device 5 is equipped with pressure rolls that cooperate with the process roller table 2; the main body of the centering device 4 is located inside the process roller table 2, and the centering device 4 is equipped with a row of guide wheels 46 on each side of the process roller table 2, and the height of the guide wheels 46 matches the height of the slab.

[0036] Furthermore, such as Figures 3-5 As shown, the process roller conveyor 2 consists of a roll changing guide rail 21, a roller conveyor assembly 22, a support base 23, a moving hydraulic cylinder 24, a roller conveyor frame 25, a base 26, and a support beam 27. The support beam 27 is fixedly connected to the mill frame 1, the base 26 is located on the outside of the mill frame 1, and the support base 23 is supported by the support beam 27 and the base 26. The roller conveyor assembly 22 is installed on the support base 23 through the roller conveyor frame 25. One end of the moving hydraulic cylinder 24 is connected to the base 26, and the other end is connected to the support base 23. The roll changing guide rail 21 is located at the end of the roller conveyor frame 25 near the mill, and the roll changing guide rail 21 is provided with nozzle mounting holes for cooling the work rolls.

[0037] Furthermore, the roller conveyor device 22 consists of a geared motor, a coupling, a free roller assembly, a transmission roller assembly, a roller chain, and a chain tensioning device. The geared motor is connected to the transmission roller assembly via the coupling, and the free roller assembly is connected to the transmission roller assembly via the roller chain. The roller chain is equipped with a chain tensioning device. The free roller in the free roller assembly rotates synchronously with the transmission roller in the transmission roller assembly.

[0038] Furthermore, such as Figures 6-8 As shown, the auxiliary roller conveyor 3 consists of a transverse hydraulic cylinder 31, a support base 32, a second roller conveyor frame 33, a second roller conveyor assembly 34, a transverse base 35, a rolling linear guide rail 36, and a pad 37. One end of the support base 32 is connected to the base 26 of the process roller conveyor 2, and the other end is fixed to the ground. A pad 37 is provided on the top of the support base 32. A rolling linear guide rail 36 is provided at the bottom of the transverse base 35, and the roller conveyor assembly 34 is installed on the transverse base 35 through the second roller conveyor frame 33. One end of the transverse hydraulic cylinder 31 is connected to the transverse base 35, and the other end is connected to the support base 32. Proximity switches are provided on the outer side of the auxiliary roller conveyor 3 at the corresponding working position and roller changing position.

[0039] Furthermore, the roller assembly 2 34 consists of a geared motor 2, a coupling 2, a free roller assembly 2, a transmission roller assembly 2, a roller chain 2, and a chain tensioning device 2; the geared motor 2 is connected to the transmission roller assembly 2 through the coupling 2, the free roller assembly 2 is connected to the transmission roller assembly 2 through the roller chain 2, and the roller chain 2 is equipped with a chain tensioning device 2; the free roller 2 in the free roller assembly 2 and the transmission roller 2 in the transmission roller assembly 2 rotate synchronously.

[0040] Furthermore, the pinch roll device 5 includes a crossbeam, a hydraulic cylinder, a pressure roll, a guide column, and a pressure roll support; the crossbeam is fixedly connected to the corresponding side wall of the mill stand 1, the hydraulic cylinder is mounted on the crossbeam, the push rod of the hydraulic cylinder is connected to the pressure roll support, the pressure roll support is L-shaped, the bottom end extends towards the mill, and the pressure roll is mounted on the extended end of the pressure roll support; a guide column is provided between the hydraulic cylinder and the pressure roll support to guide the push rod of the hydraulic cylinder; a material detection switch is provided on one side of the process roller table 2 below the pinch roll device 5 to detect the slab.

[0041] Furthermore, such as Figure 9 As shown, the centering device 4 includes a swing hydraulic cylinder 45, a centering guide plate 41, a rack 43, a gear shaft 44, a centering frame 42, and a guide wheel 46. The swing hydraulic cylinder 45 is mounted on the support seat 23 of the process roller conveyor 2 and is used to drive the gear shaft 44 to rotate. The gear shaft 44 simultaneously meshes with two parallel racks 43 for transmission. The outer ends of the two racks 43 are respectively provided with centering frames 42, and centering guide plates 41 are provided on the centering frames 42. Guide wheels 46 are provided on the centering guide plates 41.

[0042] Further, the outer side of the centering guide plate 41 is provided with a displacement sensor; the roller table frame one 25 of the process roller table 2 is provided with guide columns on both sides, which are used for guiding when the rack 43 moves.

[0043] Further, the rolling mill is a single-direction rolling mill, and the process roller table 2, the auxiliary roller table 3, the pinch roll device 5 and the centering device 4 are arranged only at the entrance side of the rolling mill.

[0044] Further, the rolling mill is a reversible rolling mill, and the process roller table 2, the auxiliary roller table 3, the pinch roll device 5 and the centering device 4 are arranged in each group at the front side entrance of the rolling mill and the rear side entrance of the rolling mill.

[0045] As shown in Figure 1 As shown in

[0046] As shown in Figure 2 As shown in the figure, when the process roller table 2 is used for single-plate slab rolling, the variable frequency reduction motor drives the sprocket, which drives the roller on the roller table to rotate to transport the slab through the chain transmission, and at the same time, the centering device 4 is used to prevent the plate from "running off", and the pinch roll device 5 is used for auxiliary steel feeding.

[0047] The process roller table 2 is arranged at the entrance side of the roller, and during production, the process roller table 2 is pushed into the rolling working position in the rolling mill stand 1 under the action of the moving hydraulic cylinder 24, and the process roller table 2 is as close as possible to the working roller of the rolling mill, which can be used as a stand roller. When changing the roller, the process roller table 2 is pushed out of the rolling mill stand 1 under the action of the moving hydraulic cylinder 24, leaving space for changing the roller; at the same time, the roller changing guide rail 21 on the process roller table 2 is connected with the roller changing guide rail installed on the rolling mill stand 1, forming a complete roller changing track.

[0048] As shown in Figures 3-5 As shown in the figure, the process roller table 2 is composed of a roller changing guide rail 21, a roller assembly one 22, a supporting seat 23, a moving hydraulic cylinder 24, a roller table frame one 25, a base 26, a supporting beam 27 and the like. Among them:

[0049] The roller changing guide rail 21 is fixed on the front end (close to the rolling mill end) of the roller table frame one 25 through bolts, which ensures the stable running of the working roller during roller changing, and the roller changing guide rail 21 is provided with nozzle mounting holes for cooling the working roller.

[0050] The roller assembly 22 is used as an executing component, and a variable frequency motor drives the roller to rotate through a chain transmission device to transport the slab. The roller assembly 22 mainly comprises a motor, a coupling, a free roller assembly, a transmission roller assembly, a roller chain and a chain tensioning device. The structure is conventional and will not be described here.

[0051] The support base 23 is a welded steel structure used to support the roller assembly 22 and as a mounting base of the moving hydraulic cylinder 24. One end of the support base 23 is supported on the support beam 27, and the other end is supported on the base 26.

[0052] The moving hydraulic cylinder 24 is used to realize the switching of the process roller 2 between the roller changing position and the rolling position.

[0053] The roller frame 25 is a welded steel structure used to support the roller assembly 22.

[0054] The base 26 and the support beam 27 are both welded steel structures, and the support beam 27 is fixedly connected to the rolling mill stand 1 through fasteners, and both of them support the support base 23.

[0055] As shown in Figure 1 , Figure 3 , the pinch roll device 5 comprises a cross beam, a hydraulic cylinder, a pressure roller, a guide column and a pressure roller support. The cross beam is a welded steel structure, and one side thereof is fixedly connected to the side wall of the rolling mill stand 1. The hydraulic cylinder drives the pressure roller support to realize the vertical movement of the pressure roller, and the guide column plays a guiding role. The pressure roller support has an approximately L-shaped structure, which ensures that the pressure roller is as close as possible to the center line of the roller during rolling.

[0056] As shown in Figure 3 , Figure 4 and Figure 9The centering device 4 is used for centering and guiding the slab at the entrance side of the rolling mill, and to some extent, it realizes accurate steel feeding. The centering device 4 is composed of a swing hydraulic cylinder 45, a centering guide plate 41, a rack 43, a gear shaft 44, a centering frame 42, a guide wheel 46 and the like. The swing hydraulic cylinder 45 provides power to drive the gear shaft 44 to rotate, and the gear shaft 44 realizes the forward and backward movement of the rack 43 along the transverse direction of the process roller way 2 through the meshing with the two racks 43. One end of each of the two racks 43 is connected with the corresponding side of the centering frame 42, and the other end is meshed with the gear shaft 44 for transmission. The two ends of the centering frame 44 are fixedly connected with the corresponding centering guide plates 41, and the rack 43 drives the two centering guide plates 41 to move synchronously when the rack 43 moves, thereby realizing the adjustment of the roller way opening degree. The two guide columns are respectively installed on the corresponding side of the roller way frame one 25 through fasteners, and play an auxiliary guiding role for the rack 43 during the gear and rack transmission process. A plurality of guide wheels 46 are respectively installed on the centering guide plates 41 on both sides, and the guide wheels 46 protrude out of the centering guide plates 41. The slab guiding process is directly contacted by the guide wheels 46 and the slab, which prevents the slab from being scratched due to collision with the centering guide plates 41.

[0057] As shown in the figure, Figures 6-8 The auxiliary roller way 3 is located between the slab conveying roller way upstream of the rolling mill and the process roller way 2, and is driven by a variable frequency speed reducer motor to drive the roller wheels in the roller way assembly two 34 to rotate to transport the slab. When the roller is replaced, the auxiliary roller way 3 is horizontally moved to the rear limit position (the roller replacement position) by the horizontal moving hydraulic cylinder 31 to make space for the process roller way 2 to retreat to the roller replacement working position.

[0058] The auxiliary roller way 3 mainly includes a horizontal moving hydraulic cylinder 31, a support base 32, a roller way frame two 33, a roller way assembly two 34, a horizontal moving base 35, a rolling linear guide 36 and a pad 37. The horizontal moving hydraulic cylinder 31 can drive the auxiliary roller way 3 to move on the pad 37. A proximity switch is arranged at the starting end of the stroke to display the working position of the auxiliary roller way 3 to the electric control system, and a proximity switch is arranged at the terminal end of the stroke to display the roller replacement position of the auxiliary roller way 3 to the electric control system, prompting the electric control system to perform subsequent roller replacement operation.

[0059] The support base 32 is a welded steel structure member, which is used for supporting the auxiliary roller way 3 during horizontal movement. One end of the support base 32 is connected with the base 26 of the process roller way 2 through fasteners, and the other end is connected with the foundation of the ground through foundation bolts.

[0060] The roller way frame two 33 is a welded steel structure member, which is used for supporting the roller way assembly two 34.

[0061] The roller assembly two 34 is driven by a variable frequency speed reducer motor, and the roller in the roller assembly two 34 is driven to rotate by a chain to transport the slab. The roller assembly two 34 mainly comprises a speed reducer motor two, a coupling two, a free roller assembly two, a transmission roller assembly two, a roller chain two and a chain tensioning device two. The structure is conventional technology, and thus will not be described here.

[0062] The transverse base 35 is a welded steel structure, and the bottom of the transverse base 35 is provided with rolling linear guides 36 through fasteners. When the roller is replaced, the rolling linear guides 36 are used to move along the pad 37 to realize the transverse movement of the auxiliary roller 3.

[0063] The working principle and working process of the auxiliary steel feeding and automatic centering device for short slab rolling are as follows:

[0064] When the rolling mill is in a rolling working state, the push rod of the moving hydraulic cylinder 24 in the process roller 2 is retracted, so that the process roller 2 is in an initial position, i.e., a rolling working position, and is close to the rolling mill. The auxiliary roller 3 is located in the working position. When the slab is transported to the inlet side of the rolling mill by the slab conveying roller upstream of the rolling mill, the material detection switch on the process roller 2 detects that the slab has reached the preset position, and then the centering device 4 is started to guide the slab. When the slab runs below the pinch roll device 5, the pressure roller in the pinch roll device 5 vertically moves downward under the action of the hydraulic cylinder, cooperates with the roller in the process roller 2, and clamps and feeds the slab to ensure the flatness of the slab during rolling, so as to realize tension-free feeding. When one end of the slab is bitten by the rolling mill, the slab establishes tension through the pinch roll device 5, realizes accurate feeding, and is rolled. When the material detection switch shows that there is no material passing through, the pressure roller in the pinch roll device 5 rises to the initial position, and the centering guide plate 41 returns to the initial position (at this time, the roller opening degree is maximum) through the action of the centering device 4.

[0065] When the rolling mill is in a roller replacement working state, the push rod of the transverse hydraulic cylinder 31 in the auxiliary roller 3 is retracted, so that the auxiliary roller 3 moves to the rear limit position (the roller replacement position). At this time, the auxiliary roller 3 moves to the outside of the process roller 2, so as to leave space for the process roller 2. After the electric control system sends a signal, the push rod of the moving hydraulic cylinder 24 in the process roller 2 extends, pushes the process roller 2 out of the rolling mill frame 1, leaves space for replacing the rolling mill. At the same time, the roller replacement guide rail 21 on the process roller 2 is butted with the roller replacement guide rail installed on the rolling mill frame 1, and a complete roller replacement track is formed.

[0066] If the rolling mill is a reversible rolling mill, the slab needs to be repeatedly rolled, and another set of auxiliary steel feeding and automatic centering devices is symmetrically installed at the outlet side of the rolling mill. According to the same principle, the slab repeatedly rolled can be successfully bitten by the rolling mill.

[0067] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An auxiliary steel feeding and automatic centering device for short slab rolling, characterized in that, The utility model provides a kind of rolling mill roll changing device, including process roller, auxiliary roller, pinch roll device and centering device;The process roller is located at the entrance of rolling mill, and the auxiliary roller is located between the process roller and the slab conveying roller upstream of rolling mill;The process roller can be switched between rolling working position and roll changing working position;The auxiliary roller can be switched between working position and roll changing position;When the slab conveying roller upstream of rolling mill, the auxiliary roller and the process roller are sequentially connected, the process roller is in rolling working position, and the auxiliary roller is in working position;When roll changing, the auxiliary roller moves to roll changing position outside the process roller, and the process roller moves to roll changing working position away from rolling mill;The pinch roll device is located above the process roller near the entrance of rolling mill, and the pinch roll device is provided with pressure roller matched with the process roller;The main body of the centering device is located in the process roller, and the centering device is provided with a row of guide pulley on both sides of the process roller, and the height of the guide pulley matches the height of slab. The process roller is composed of roll changing guide rail, roller assembly one, support seat, moving hydraulic cylinder, roller frame one, base and support beam;The support beam is fixedly connected with the frame of rolling mill, the base is located outside the frame of rolling mill, and the support seat is supported by the support beam and the base;The roller assembly one is installed on the support seat through the roller frame one, one end of the moving hydraulic cylinder is connected with the base, and the other end is connected with the support seat;The roll changing guide rail is located at one end of the roller frame one close to the rolling mill, and the roll changing guide rail is provided with nozzle mounting hole for cooling work roll. The auxiliary roller is composed of horizontal moving hydraulic cylinder, support base, roller frame two, roller assembly two, horizontal moving base, rolling linear guide rail and pad;One end of the support base is connected with the base of the process roller, and the other end is fixed on the ground;The pad is arranged on the top of the support base;The rolling linear guide rail is arranged on the bottom of the horizontal moving base, and the horizontal moving base moves along the pad through the rolling linear guide rail;The roller assembly two is installed on the horizontal moving base through the roller frame two;One end of the horizontal moving hydraulic cylinder is connected with the horizontal moving base, and the other end is connected with the support base;Proximity switches are arranged at the corresponding working position and roll changing position on the outside of the auxiliary roller.

2. A device for assisting the feeding of steel and automatic centering for short slab rolling according to claim 1, characterized in that, The roller assembly one is composed of speed reducer one, coupling one, free roller assembly one, transmission roller assembly one, roller chain one and chain tensioning device one;The speed reducer one is connected with the transmission roller assembly one through the coupling one, the free roller assembly one is connected with the transmission roller assembly one through the roller chain one, and the roller chain one is provided with the chain tensioning device one;The free roller one in the free roller assembly one rotates synchronously with the transmission roller one in the transmission roller assembly one.

3. A device for assisting the feeding of steel and automatic centering for short slab rolling according to claim 1, characterized in that, The roller assembly two is composed of speed reducer two, coupling two, free roller assembly two, transmission roller assembly two, roller chain two and chain tensioning device two;The speed reducer two is connected with the transmission roller assembly two through the coupling two, the free roller assembly two is connected with the transmission roller assembly two through the roller chain two, and the roller chain two is provided with the chain tensioning device two;The free roller two in the free roller assembly two rotates synchronously with the transmission roller two in the transmission roller assembly two.

4. A device for assisting the feeding of steel and automatic centering for short slab rolling according to claim 1, characterized in that, The pinch roll device comprises a crossbeam, a hydraulic cylinder, a pressure roller, a guide column and a pressure roller support; the crossbeam is fixed to the corresponding side wall of the rolling mill stand, the hydraulic cylinder is installed on the crossbeam, the push rod of the hydraulic cylinder is connected with the pressure roller support, the pressure roller support is L-shaped, the bottom end extends to the rolling mill direction, and the pressure roller is installed on the extended end of the pressure roller support; the guide column is arranged between the hydraulic cylinder and the pressure roller support to guide the push rod of the hydraulic cylinder; a material detection switch is arranged on one side of the process roller way below the pinch roll device to detect the slab.

5. A device for assisting the feeding of steel and automatic centering for short slab rolling according to claim 1, characterized in that, The centering device comprises a swing hydraulic cylinder, a centering guide plate, a rack, a gear shaft, a centering frame and a guide wheel; the swing hydraulic cylinder is arranged on the support seat of the process roller way to drive the gear shaft to rotate, and the gear shaft is in meshing transmission with two parallel racks; the outer ends of the two racks are respectively provided with the centering frame, the centering guide plate is arranged on the centering frame, and the guide wheel is arranged on the centering guide plate.

6. A device for assisted steel feeding and automatic centering for short slab rolling according to claim 5, characterized in that, A displacement sensor is arranged on the outer side of the centering guide plate; guide columns are arranged on the two sides of the roller way frame of the process roller way to guide the movement of the rack.

7. A device for assisting the feeding of steel and automatic centering for short slab rolling according to claim 1, characterized in that, The rolling mill is a single-direction rolling mill, and the process roller way, the auxiliary roller way, the pinch roll device and the centering device are arranged only on the inlet side of the rolling mill.

8. A device for assisting the feeding of steel and automatic centering for short slab rolling according to claim 1, characterized in that, The rolling mill is a reversible rolling mill, and one set of the process roller way, the auxiliary roller way, the pinch roll device and the centering device is arranged at the front side inlet of the rolling mill and the rear side inlet of the rolling mill.

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