Assisted steel feeding and automatic centering device for short slab rolling

Abstract

The present invention relates to an assisted steel feeding and automatic centering device for short slab rolling. The device comprises a process roller way, an auxiliary roller way, a pinch roller device, and a centering device; the process roller way is arranged at an inlet of a rolling mill; and the auxiliary roller way is arranged between the process roller way and an upstream slab conveying roller way of the rolling mill. The present invention uses the structure where a transverse moving auxiliary roller way is mated with a longitudinal moving process roller way, so that the process roller way can get close to a roll guide and guard device to the maximum extent, and thus steel biting of the rolling mill is facilitated; tension-free feeding is achieved by means of power obtained for the blank on the process roller way, and the rolling accuracy is improved; the process roller way is provided with the centering device driven by a swing hydraulic cylinder, so as to avoid sheet deviation during rolling, so that the feeding accuracy is improved; the whole device has simple structure, and stable and reliable performance, so that mechanical steel feeding and centering are achieved, thereby eliminating potential safety hazards caused by manual operations, and improving the steel rolling efficiency.

Description

An auxiliary steel feeding and automatic centering device for short slab rolling Technical Field

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

[0002] Auxiliary steel feeding and automatic centering devices used at the entrance or exit of a rolling mill typically consist of process rollers, auxiliary rollers, pinch rolls, and guides. Together, they ensure precise billet feeding and support rolling (including reciprocating rolling) in the mill. During roll changes, the auxiliary rollers are withdrawn from the rolling line, and the process rollers exit the mill window, allowing the work rolls to be removed from the mill.

[0003] Cold-rolled special steel production lines often roll short billets, typically 600 to 1000 mm. Due to a lack of tension, the mill struggles to hold the steel, hindering smooth rolling. Currently, manual feeding is often employed, which is labor-intensive, risky, and inefficient. Even when increasing the linear speed of the front and rear working rollers to increase the inertia of the billet at the mill entrance, problems such as poor steel holding and substandard rolled products still persist.

[0004] Chinese patent application number 201811086772.6 discloses a "roller stand for conveying short billets rolled in a metal sheet rolling mill." The device comprises left and right bearing blocks mounted on the left and right rolling mill frames, first to sixth pattern rollers, first to sixth main gears, and first to fifth transmission gears. The first to sixth pattern rollers are mounted in the bearing holes of the left and right bearing blocks, respectively. The left ends of the first to sixth pattern rollers are mounted with the first to sixth main gears, respectively. The first to fifth transmission gears are mounted in the left bearing block and mesh with the first to sixth main gears, respectively. The right end of the first pattern roller is connected to a motor via a drive shaft and a coupling. This device is designed for rolling short billets (minimum billet length 350mm). When conveying a short billet, the motor is activated to rotate the first pattern roller and the first main gear, which in turn rotates the transmission gears, the driving gear, and the pattern rollers in turn, achieving the purpose of conveying the short billet. However, its fixed mounting arrangement makes roller changing difficult.

[0005] Typically, there are two ways to install pinch rolls in a rolling mill. One method involves securing the pinch rolls by opening pinch roll mounting holes in the mill frame. This significantly weakens the mill frame's strength. The other method places the pinch rolls farther from the rolling line, but this fails to pinch short billets and can cause loose grip on long billets, impacting rolling quality. Furthermore, due to structural limitations, fixed guides were typically installed within the mill frame, preventing real-time adjustment of the roller table opening and ensuring accurate positioning of the billet entering the mill.

[0006] Summary of the Invention

[0007] The present invention provides an auxiliary steel feeding and automatic centering device for rolling short slabs. The device adopts a structure of a transversely movable auxiliary roller and a longitudinally movable process roller, so that the process roller can be as close to the roller guide device as possible, which is convenient for the rolling mill to bite the steel; at the same time, tension-free feeding is achieved by relying on the power obtained by the billet on the process roller, thereby improving the rolling accuracy; a centering device driven by a swing hydraulic cylinder is provided on the process roller to avoid deviation of the plate during rolling, thereby improving the feeding accuracy; the overall structure of the device is simple, the performance is stable and reliable, mechanized steel feeding and centering are realized, the safety hazards caused by manual operation are eliminated, and it is conducive to improving the rolling efficiency.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] The slab conveying roller of the present invention is provided with a plurality of guide rollers, and the guide rollers are provided with a plurality of guide rollers, and the guide rollers are provided with guide rollers which match the slab conveying rollers.

[0010] Furthermore, the process roller table is composed of a roller changing guide rail, a roller table assembly, a support seat, a mobile hydraulic cylinder, a roller table frame, a base, and a support beam; the support beam is fixedly connected to the rolling mill frame, the base is arranged on the outside of the rolling mill frame, and the support seat is supported by the support beam and the base; the roller table assembly is installed on the support seat through the roller table frame, one end of the mobile hydraulic cylinder is connected to the base, and the other end is connected to the support seat; the roller changing guide rail is arranged at one end of the roller table frame close to the rolling mill, and the roller changing guide rail is provided with a nozzle mounting hole for cooling the working roll.

[0011] Furthermore, the roller device is composed of a reduction motor, a coupling, a free roller assembly, a transmission roller assembly, a roller chain and a chain tensioning device; the reduction motor is connected to the transmission roller assembly through a coupling, the free roller assembly is connected to the transmission roller assembly through a roller chain, and the roller chain is provided with a chain tensioning device; the free roller in the free roller assembly rotates synchronously with the transmission roller in the transmission roller assembly.

[0012] Furthermore, the auxiliary roller is composed of a transverse hydraulic cylinder, a support base, a second roller frame, a second roller assembly, a transverse base, a rolling linear guide and a pad; one end of the support base is connected to the base of the process roller, and the other end is fixed to the ground; a pad is provided on the top of the support base; a rolling linear guide is provided at the bottom of the transverse base, which moves along the pad through the rolling linear guide; the second roller assembly is installed on the transverse base through the second roller frame; one end of the transverse hydraulic cylinder is connected to the transverse base, and the other end is connected to the support base; proximity switches are provided on the outside of the auxiliary roller at the corresponding working position and roller changing position.

[0013] Furthermore, the roller assembly 2 is composed of a reduction motor 2, a coupling 2, a free roller assembly 2, a drive roller assembly 2, a roller chain 2 and a chain tensioning device 2; the reduction motor 2 is connected to the drive roller assembly 2 through a coupling 2, the free roller assembly 2 is connected to the drive roller assembly 2 through a roller chain 2, and the roller chain 2 is provided with a chain tensioning device 2; the free roller 2 in the free roller assembly 2 rotates synchronously with the drive roller 2 in the drive roller assembly 2.

[0014] Furthermore, the pinch roller device includes a crossbeam, a hydraulic cylinder, a pressure roller, a guide column and a pressure roller support; the crossbeam is fixedly connected to the corresponding side wall of the rolling mill frame, the hydraulic cylinder is installed on the crossbeam, the push rod of the hydraulic cylinder is connected to the pressure roller support, the pressure roller support is L-shaped, and the bottom end extends toward the rolling mill, and the pressure roller is installed at the extended end of the pressure roller support; a guide column is provided between the hydraulic cylinder and the pressure roller support to guide the push rod of the hydraulic cylinder; a material detection switch is provided on the side of the process roller below the pinch roller device to detect the slab.

[0015] Furthermore, the centering device includes a swinging hydraulic cylinder, a centering guide plate, a rack, a gear shaft, a centering frame and a guide wheel; the swinging hydraulic cylinder is arranged on the support seat of the process roller, and is used to drive the gear shaft to rotate, and the gear shaft is simultaneously engaged with two parallel racks for transmission; the outer ends of the two racks are respectively provided with a centering frame, a centering guide plate is provided on the centering frame, and a guide wheel is provided on the centering guide plate.

[0016] Furthermore, a displacement sensor is provided on the outer side of the centering guide plate; and guide columns are provided on both sides of the roller frame of the process roller, for guiding when the rack moves.

[0017] Furthermore, the rolling mill is a one-way rolling mill, and the process rollers, auxiliary rollers, pinch roller devices and centering devices are only provided on the inlet side of the rolling mill.

[0018] Furthermore, the rolling mill is a reversible rolling mill, and a set of process rollers, auxiliary rollers, pinch roller devices and centering devices are respectively provided at the front entrance and the rear entrance of the rolling mill.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The structure of a transverse movable auxiliary roller table combined with a longitudinal movable process roller table allows the process roller table to be as close to the roll guide device as possible, making it easier for the rolling mill to bite the steel;

[0021] 2) Relying on the power obtained by the billet on the process roller to achieve tension-free feeding, thereby improving rolling accuracy;

[0022] 3) A centering device driven by a swing hydraulic cylinder is installed on the process roller, which can guide the billet at the entrance of the rolling mill to prevent the plate from running off during rolling and improve the feeding accuracy;

[0023] 4) The process roller is equipped with a pinch roller device, which adopts an L-shaped structure as a whole to ensure that the pressure roller is as close to the center line of the roller as possible during rolling, which is convenient for feeding;

[0024] 5) The process roller can also be used as the stand roller of the rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a structural schematic diagram of an auxiliary steel feeding and automatic centering device for short slab rolling according to the present invention.

[0026] FIG. 2 is a top view of FIG. 1 .

[0027] FIG3 is a second structural schematic diagram of an auxiliary steel feeding and automatic centering device for short slab rolling according to the present invention.

[0028] FIG4 is a top view of FIG3 (excluding the auxiliary roller and the pinch roller device except the support base).

[0029] FIG5 is a left side view of FIG3.

[0030] FIG6 is a schematic structural diagram of the auxiliary roller conveyor according to the present invention.

[0031] FIG. 7 is a top view of FIG. 6 .

[0032] FIG8 is a right side view of FIG6.

[0033] FIG9 is a schematic structural diagram of the centering device of the present invention.

[0034] Figure: 1. Rolling Mill Frame 2. Process Roller 21. Roller Changing Guide 22. Roller Assembly 1 23. Support Base 24. Mobile Hydraulic Cylinder 25. Roller Frame 1 26. Base 27. Support Beam 3. Auxiliary Roller 31. Transverse Hydraulic Cylinder 32. Support Base 33. Roller Frame 2 34. Roller Assembly 2 35. Transverse Base 36. Rolling Linear Guide 37. Pad 4. Centering Device 41. Centering Guide 42. Centering Frame 43. Rack 44. Gear Shaft 45. Swing Hydraulic Cylinder 46. Guide Wheel 5. Pinch Roller Assembly DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0036] As shown in Figures 1 to 9, the auxiliary steel feeding and automatic centering device for short slab rolling of the present invention comprises a process roller 2, an auxiliary roller 3, a pinch roller device 5 and a centering device 4; the process roller 2 is arranged at the entrance of the rolling mill, and the auxiliary roller 3 is arranged between the process roller 2 and the slab conveying roller upstream of the rolling mill; the process roller 2 can be switched between the rolling work position and the roll changing work position; the auxiliary roller 3 can be switched between the working position and the roll changing position; when the slab conveying roller upstream of the rolling mill, the auxiliary roller 3 and the process roller 2 are connected in sequence, the process roller 2 The process roller 2 is in the rolling working position, and the auxiliary roller 3 is in the working position; when changing rollers, the auxiliary roller 3 moves laterally to the roller changing position outside the process roller 2, and the process roller 2 moves away from the rolling mill to the roller changing working position; the pinch roller device 5 is arranged above the process roller 2 near the entrance of the rolling mill, and the pinch roller device 5 is provided with a pressure roller that cooperates with the process roller 2; the main body of the centering device 4 is arranged in the process roller 2, and the centering device 4 is provided with a row of guide wheels 46 on both sides of the process roller 2, and the height of the guide wheel 46 matches the height of the slab.

[0037] Furthermore, as shown in Figures 3 to 5, the process roller 2 is composed of a roller changing guide rail 21, a roller assembly 22, a support seat 23, a mobile hydraulic cylinder 24, a roller frame 25, a base 26, and a support beam 27; the support beam 27 is fixedly connected to the rolling mill frame 1, the base 26 is arranged on the outside of the rolling mill frame 1, and the support seat 23 is supported by the support beam 27 and the base 26; the roller assembly 22 is installed on the support seat 23 through the roller frame 25, one end of the mobile hydraulic cylinder 24 is connected to the base 26, and the other end is connected to the support seat 23; the roller changing guide rail 21 is arranged at one end of the roller frame 25 close to the rolling mill, and the roller changing guide rail 21 is provided with a nozzle mounting hole for cooling the working roll.

[0038] Furthermore, the roller device 22 is composed of a reduction motor, a coupling, a free roller assembly, a transmission roller assembly, a roller chain and a chain tensioning device; the reduction motor is connected to the transmission roller assembly through a coupling, the free roller assembly is connected to the transmission roller assembly through a roller chain, and the roller chain is provided with a chain tensioning device; the free roller in the free roller assembly rotates synchronously with the transmission roller in the transmission roller assembly.

[0039] Furthermore, as shown in Figures 6 to 8, the auxiliary roller 3 is composed of a transverse hydraulic cylinder 31, a support base 32, a roller frame 33, a roller assembly 34, a transverse base 35, a rolling linear guide 36 and a pad 37; one end of the support base 32 is connected to the base 26 of the process roller 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 36 is provided at the bottom of the transverse base 35, which moves along the pad 37 through the rolling linear guide 36; the roller assembly 34 is installed on the transverse base 35 through the roller 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 outside of the auxiliary roller 3 at the corresponding working position and roller changing position.

[0040] Furthermore, the roller assembly 2 34 is composed of a reduction motor 2, a coupling 2, a free roller assembly 2, a drive roller assembly 2, a roller chain 2 and a chain tensioning device 2; the reduction motor 2 is connected to the drive roller assembly 2 through a coupling 2, the free roller assembly 2 is connected to the drive roller assembly 2 through a roller chain 2, and the roller chain 2 is provided with a chain tensioning device 2; the free roller 2 in the free roller assembly 2 rotates synchronously with the drive roller 2 in the drive roller assembly 2.

[0041] Furthermore, the pinch roller device 5 includes a crossbeam, a hydraulic cylinder, a pressure roller, a guide column and a pressure roller support; the crossbeam is fixedly connected to the corresponding side wall of the rolling mill frame 1, the hydraulic cylinder is installed on the crossbeam, the push rod of the hydraulic cylinder is connected to the pressure roller support, the pressure roller support is L-shaped, and the bottom end extends toward the rolling mill, and the pressure roller is installed at the extended end of the pressure roller support; a guide column is provided between the hydraulic cylinder and the pressure roller support to guide the push rod of the hydraulic cylinder; a material detection switch is provided on one side of the process roller 2 below the pinch roller device 5 to detect the slab.

[0042] Furthermore, as shown in Figure 9, the centering device 4 includes a swinging 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 swinging hydraulic cylinder 45 is arranged on the support seat 23 of the process roller 2, and is used to drive the gear shaft 44 to rotate, and the gear shaft 44 is simultaneously engaged with two parallel racks 43 for transmission; the outer ends of the two racks 43 are respectively provided with centering frames 42, the centering guide plates 41 are provided on the centering frames 42, and the centering guide plates 41 are provided on the guide wheels 46.

[0043] Furthermore, a displacement sensor is provided on the outer side of the centering guide plate 41; and guide columns are provided on both sides of the roller frame 25 of the process roller 2 for guiding the rack 43 when it moves.

[0044] Furthermore, the rolling mill is a one-way rolling mill, and the process roller 2, the auxiliary roller 3, the pinch roller device 5 and the centering device 4 are only provided at the inlet side of the rolling mill.

[0045] Furthermore, the rolling mill is a reversible rolling mill, and a set of process rollers 2, auxiliary rollers 3, pinch roller devices 5 and centering devices 4 are respectively provided at the front entrance and the rear entrance of the rolling mill.

[0046] As shown in Figure 1, the auxiliary steel feeding and automatic centering device for short slab rolling described in the present invention is installed on the roll inlet side of a unidirectional mill. If the mill is reversible, two sets are installed symmetrically on the roll inlet and roll outlet sides. The base 26 of the process roller table 2 is fixedly connected to the corresponding side of the mill frame 1.

[0047] As shown in Figure 2, when the process roller 2 is used for rolling a single slab, the variable frequency reduction motor drives the sprocket, which drives the rollers on the roller table to rotate through the sprocket chain transmission to transport the slab. At the same time, the centering device 4 is used to prevent the plate from "deviation", and the pinch roller device 5 is used to assist in feeding steel.

[0048] The process roller table 2 is located at the roll inlet. During production, the process roller table 2 is pushed into the rolling work station within the mill stand 1 by the action of a movable hydraulic cylinder 24. The process roller table 2 is positioned as close as possible to the work rolls of the mill, allowing it to function as a stand roller. During roll changes, the process roller table 2 is pushed out of the mill stand 1 by the action of the movable hydraulic cylinder 24, leaving space for roll replacement. Simultaneously, the roll-changing guide rail 21 on the process roller table 2 docks with the roll-changing guide rail installed on the mill stand 1, forming a complete roll-changing track.

[0049] As shown in Figures 3 to 5, the process roller table 2 is composed of a roller changing guide rail 21, a roller table assembly 22, a support seat 23, a mobile hydraulic cylinder 24, a roller table frame 25, a base 26, a support beam 27, etc. Among them:

[0050] The roll changing rail 21 is fixed to the front end of the roller stand 25 (close to one end of the rolling mill) by bolts to ensure that the working rolls run smoothly during roll changing. At the same time, the roll changing rail 21 is provided with nozzle mounting holes for cooling the working rolls.

[0051] The roller assembly 22 is used as an executive component, and a variable frequency reduction motor is used to drive the roller to rotate through a chain transmission device to transport the slab. The roller assembly 22 is mainly composed of a reduction motor, a coupling, a free roller assembly, a drive roller assembly, a roller chain and a chain tensioning device. Its structure is conventional technology and will not be described in detail here.

[0052] The support base 23 is a welded steel structure used to support the roller assembly 22 and serve as a mounting base for the mobile 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.

[0053] The mobile hydraulic cylinder 24 is used to realize the switching of the process roller 2 between the roll changing working position and the rolling working position.

[0054] The roller frame 25 is made of welded steel structure and is used to support the roller assembly 22.

[0055] The base 26 and the support beam 27 are both welded steel structures, wherein the support beam 27 is fixedly connected to the rolling mill frame 1 via fasteners, and the two together support the support base 23.

[0056] As shown in Figures 1 and 3, the pinch roll assembly 5 comprises a crossbeam, hydraulic cylinder, pinch rolls, guide posts, and pinch roll supports. The crossbeam is a welded steel structure, one side of which is fixedly connected to the side wall of the rolling mill frame 1. The hydraulic cylinder drives the pinch roll supports to achieve vertical movement of the pinch rolls, while the guide posts provide guidance. The pinch roll supports utilize a nearly L-shaped structure to ensure that the pinch rolls are as close to the centerline as possible during rolling.

[0057] As shown in Figures 3, 4, and 9, the centering device 4 is used to align and guide the slab at the mill entrance, ensuring accurate steel feeding to a certain extent. The centering device 4 consists of a swinging hydraulic cylinder 45, a centering guide plate 41, a rack 43, a pinion shaft 44, a centering frame 42, and a guide wheel 46. Powered by the swinging hydraulic cylinder 45, the pinion shaft 44 rotates. The pinion shaft 44 meshes with two racks 43, enabling the racks 43 to move forward and backward transversely along the process roller table 2. One end of each rack 43 is connected to the centering frame 42 on the corresponding side, and the other end meshes with the pinion shaft 44 for transmission. The centering frames 44 at each end are fixedly connected to the corresponding centering guide plate 41. Movement of the rack 43 drives the two centering guide plates 41 synchronously, adjusting the roller table opening. Two guide posts are attached to the corresponding sides of the roller table frame 25 via fasteners, providing auxiliary guidance for the racks 43 during the rack-and-pinion transmission process. A number of guide wheels 46 (3 as shown) are installed on the centering guide plates 41 on both sides. The guide wheels 46 protrude from the centering guide plates 41. During the slab guiding process, the guide wheels 46 are in direct contact with the slab to prevent the slab from colliding with the centering guide plates 41 and causing scratches on the slab.

[0058] As shown in Figures 6-8, the auxiliary roller table 3 is located upstream of the rolling mill, between the slab conveyor roller table and the process roller table 2. Driven by a variable-frequency reduction motor, it drives the rollers in roller table assembly 2 34 via a chain to transport the slab. During roll changes, the auxiliary roller table 3 is laterally moved to the rear limit position (roller change position) by the transverse hydraulic cylinder 31, making room for the process roller table 2 to retreat to the roll change working position.

[0059] The auxiliary roller table 3 mainly includes a transverse hydraulic cylinder 31, a support base 32, a roller frame 33, a roller assembly 34, a transverse base 35, a rolling linear guide 36, and a pad 37. The transverse hydraulic cylinder 31 can drive the auxiliary roller table 3 to move on the pad 37. A proximity switch is set at the starting end of the stroke to indicate to the electronic control system that the auxiliary roller table 3 has reached the working position. A proximity switch is set at the end of the stroke to indicate to the electronic control system that the auxiliary roller table 3 has reached the roller changing position, prompting the electronic control system to proceed with the subsequent roller changing operation.

[0060] The support base 32 is a welded steel structure used to support the auxiliary roller 3 when it moves horizontally. One end of the support base 32 is connected to the base 26 of the process roller 2 through a fastener, and the other end is connected to the ground foundation through anchor bolts.

[0061] The roller frame 2 33 is a welded steel structure used to support the roller assembly 2 34 .

[0062] The roller assembly 2 34 is an actuator and is driven by a variable frequency reduction motor. The rollers in the roller assembly 2 34 are driven by a chain to rotate to transport the slabs. The roller assembly 2 34 mainly consists of a reduction motor 2, a coupling 2, a free roller assembly 2, a drive roller assembly 2, a roller chain 2 and a chain tensioning device 2. Its structure is conventional technology and will not be described in detail here.

[0063] The lateral movement base 35 is a welded steel structure, and a rolling linear guide 36 is installed on its bottom through fasteners. When changing rollers, the rolling linear guide 36 moves along the pad 37 to achieve lateral movement of the auxiliary roller 3.

[0064] The working principle and working process of the auxiliary steel feeding and automatic centering device for short slab rolling described in the present invention are as follows:

[0065] When the mill is in the rolling operation state, the push rod of the mobile hydraulic cylinder 24 in the process roller 2 retracts, placing the process roller 2 in its initial position, the rolling operation position, close to the rollers, and the auxiliary roller 3 in its operating position. When the slab is transported to the mill entrance via the upstream slab conveyor rollers, 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 activated to guide the slab. When the slab passes under the pinch roller device 5, the pressure rollers in the pinch roller device 5 move vertically downward under the action of the hydraulic cylinder, cooperating with the rollers in the process roller 2 to pinch the slab, ensuring the flatness of the slab during rolling and achieving tension-free feeding. When one end of the slab is engaged by the rolling mill, tension is established in the slab via the pinch roller device 5, enabling accurate feeding and rolling. When the material detection switch shows that no material is passing, the pressure roller in the pinch roller device 5 rises to the initial position, and the centering device 4 is activated to return the centering guide plate 41 to the initial position (the roller opening is the largest at this time).

[0066] When the rolling mill is in roll-changing operation, the push rod of the traverse hydraulic cylinder 31 in the auxiliary roller table 3 retracts, moving the auxiliary roller table 3 to the rear limit position (roll-changing position). At this point, the auxiliary roller table 3 moves to the outside of the process roller table 2, making room for the process roller table 2 to retreat. After the electronic control system sends a signal, the push rod of the traverse hydraulic cylinder 24 in the process roller table 2 extends, pushing the process roller table 2 out of the rolling mill frame 1, leaving space for roll replacement. Simultaneously, the roll-changing guide rail 21 on the process roller table 2 docks with the roll-changing guide rail installed on the rolling mill frame 1, forming a complete roll-changing track.

[0067] If the rolling mill is a reversible rolling mill and the slab needs to be rolled repeatedly, another set of auxiliary steel feeding and automatic centering devices are symmetrically installed on the roller outlet side. Based on the same principle, the repeatedly rolled slab can be successfully bitten by the rollers.

[0068] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An auxiliary steel feeding and automatic centering device for short slab rolling, characterized in that: It includes a process roller, an auxiliary roller, a pinch roller device and a centering device; the process roller is arranged at the entrance of the rolling mill, and the auxiliary roller is arranged between the process roller and the upstream slab conveying roller of the rolling mill; the process roller can switch between the rolling work position and the roll changing work position; the auxiliary roller can switch between the working position and the roll changing position; when the upstream slab conveying roller, the auxiliary roller and the process roller are connected in sequence, the process roller is in the rolling work position and the auxiliary roller is in the working position; when changing rollers, the auxiliary roller moves laterally to the roll changing position outside the process roller, and the process roller moves to the roll changing position away from the rolling mill; the pinch roller device is arranged above the process roller near the entrance of the rolling mill, and the pinch roller device is provided with a pressure roller matched with the process roller; the main body of the centering device is arranged in the process roller, and the centering device is provided with a row of guide wheels on both sides of the process roller, and the height of the guide wheels matches the height of the slab.

2. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 1, characterized in that: The process roller table is composed of a roll changing guide rail, a roller table assembly, a support seat, a mobile hydraulic cylinder, a roller table frame, a base, and a support beam; the support beam is fixedly connected to the rolling mill frame, the base is arranged on the outside of the rolling mill frame, and the support seat is supported by the support beam and the base; the roller table assembly is installed on the support seat through the roller table frame, one end of the mobile hydraulic cylinder is connected to the base, and the other end is connected to the support seat; the roll changing guide rail is arranged at one end of the roller table frame close to the rolling mill, and the roll changing guide rail is provided with a nozzle mounting hole for cooling the working roll.

3. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 2, characterized in that: The roller device is composed of a reduction motor, a coupling, a free roller assembly, a transmission roller assembly, a roller chain and a chain tensioning device; the reduction motor is connected to the transmission roller assembly through a coupling, the free roller assembly is connected to the transmission roller assembly through a roller chain, and the roller chain is provided with a chain tensioning device; the free roller in the free roller assembly rotates synchronously with the transmission roller in the transmission roller assembly.

4. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 1, characterized in that: The auxiliary roller is composed of a transverse hydraulic cylinder, a supporting base, a second roller frame, a second roller assembly, a transverse base, a rolling linear guide and a pad; one end of the supporting base is connected to the base of the process roller, and the other end is fixed to the ground; a pad is provided on the top of the supporting base; a rolling linear guide is provided at the bottom of the transverse base, and moves along the pad through the rolling linear guide; the second roller assembly is installed on the transverse base through the second roller frame; one end of the transverse hydraulic cylinder is connected to the transverse base, and the other end is connected to the supporting base; proximity switches are provided on the outer side of the auxiliary roller at the corresponding working position and roller changing position.

5. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 4, characterized in that: The roller assembly 2 is composed of a reduction motor 2, a coupling 2, a free roller assembly 2, a drive roller assembly 2, a roller chain 2 and a chain tensioning device 2; the reduction motor 2 is connected to the drive roller assembly 2 through the coupling 2, the free roller assembly 2 is connected to the drive roller assembly 2 through the roller chain 2, and the roller chain 2 is provided with a chain tensioning device 2; the free roller 2 in the free roller assembly 2 rotates synchronously with the drive roller 2 in the drive roller assembly 2.

6. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 1, characterized in that: The pinch roller device includes a crossbeam, a hydraulic cylinder, a pressure roller, a guide column and a pressure roller support; the crossbeam is fixedly connected to the corresponding side wall of the rolling mill frame, the hydraulic cylinder is installed on the crossbeam, the push rod of the hydraulic cylinder is connected to the pressure roller support, the pressure roller support is L-shaped, and the bottom end extends toward the rolling mill, and the pressure roller is installed at the extended end of the pressure roller support; a guide column is provided between the hydraulic cylinder and the pressure roller support to guide the push rod of the hydraulic cylinder; a material detection switch is provided on one side of the process roller below the pinch roller device to detect the slab.

7. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 1, characterized in that: The centering device includes a swinging hydraulic cylinder, a centering guide plate, a rack, a gear shaft, a centering frame and a guide wheel; the swinging hydraulic cylinder is arranged on the supporting seat of the process roller, and is used to drive the gear shaft to rotate, and the gear shaft is simultaneously meshed with two parallel racks for transmission; the outer ends of the two racks are respectively provided with a centering frame, a centering guide plate is arranged on the centering frame, and a guide wheel is arranged on the centering guide plate.

8. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 7, characterized in that: A displacement sensor is arranged on the outer side of the centering guide plate; guide columns are arranged on both sides of the roller frame of the process roller respectively, which are used for guiding when the rack moves.

9. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 1, characterized in that: The rolling mill is a one-way rolling mill, and the process roller table, auxiliary roller table, pinch roller device and centering device are only arranged on the inlet side of the rolling mill.

10. The auxiliary steel feeding and automatic centering device for short slab rolling according to claim 1, characterized in that: The rolling mill is a reversible rolling mill, and a set of process rollers, auxiliary rollers, pinch roller devices and centering devices are respectively arranged at the front entrance and the rear entrance of the rolling mill.

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