Three-roller mill and roller changing method thereof

Abstract

The invention discloses a three-roller mill and a roller changing method thereof, and relates to the field of steel rolling equipment, the three-roller mill comprises a plurality of groups of roller shaft assemblies, the plurality of groups of roller shaft assemblies are arranged on a machine core, and the plurality of groups of roller shaft assemblies are circumferentially arranged on the machine core; the roller shaft assembly comprises a roller ring, the roller ring is rotationally arranged on the sliding seat, and the roller ring is connected with a roller shaft; the roller shaft assembly is connected with a press which is used for driving the roller shaft assembly. A machine base is arranged on the outer side of the machine core, and a gear motor is arranged on the outer side wall of the machine base and used for driving a roller ring of the roller shaft assembly to rotate. In a limited space structure, a driving structure is arranged, the steel bar does not need to pass through a traction roller and a straightening mechanism after being rolled and formed, the outer circle of the steel bar is not abraded any more, and product quality is guaranteed. The cold rolling efficiency of cold-rolled steel bars is improved; and through the set roller replacing mode, the roller replacing operation can be efficiently carried out, and the roller replacing efficiency is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of rolling equipment, and particularly relates to a three-roll mill and a roll changing method thereof. Background Art

[0002] For the rolling mill equipment for producing cold-rolled ribbed steel bars with three-sided ribs, the roll rings need to be evenly distributed in three equal parts along the circumference. Due to space structure limitations, it is relatively difficult to arrange the corresponding drive system for this type of rolling mill. Therefore, the existing cold-rolled ribbed steel bars with three-sided ribs are generally produced by the drawing process. The three-roll mill does not have a drive system, but a traction roll is arranged upstream of the rolling mill. The steel bars are wound around the traction roll for several turns, and the driving force generated by the friction of the traction roll is used to pull the steel bars, thereby realizing passive rolling production.

[0003] The new national standard for cold-rolled ribbed steel bars, GB13788-2024, was released and implemented in September 2024. The new standard strictly regulates the shape of the three-sided ribbed steel bars, especially the height of the transverse ribs of the steel bars.

[0004] For the steel bars produced by the drawing process and passive production, since the steel bars must pass through the traction roll after forming, and straight steel bars also need to be straightened by a straightening mechanism during production. These two processes inevitably cause strong friction on the outer circle of the steel bars, especially wear the transverse ribs of the steel bars, and finally result in the product quality not meeting the standard requirements. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a three-roll mill and a roll changing method thereof. After the steel bars are rolled and formed, they no longer need to pass through the traction roll and the straightening mechanism, and the outer circle of the steel bars is no longer worn, ensuring the product quality and at least solving one of the problems in the background art.

[0006] The present invention provides the following technical solutions:

[0007] A three-roll mill includes multiple groups of roll shaft assemblies, the multiple groups of roll shaft assemblies are arranged on the machine core, and the multiple groups of roll shaft assemblies are arranged in a circumferential manner on the machine core;

[0008] The roll shaft assembly includes a roll ring, the roll ring is rotatably arranged on the sliding seat, and the roll ring is connected to the roll shaft;

[0009] The roll shaft assembly is connected to a press, and the press is used to drive the roll shaft assembly.

[0010] A machine base is arranged outside the machine core, and a reduction motor is arranged on the outer side wall of the machine base. The reduction motor is used to drive the roll ring of the roll shaft assembly to rotate.

[0011] Preferably, the roll shaft assembly further includes a swing arm, the swing arm is provided with a groove for placing the sliding seat, and the sliding seat can move and adjust along the length direction of the swing arm in the groove.

[0012] Preferably, the swing arm is provided with an adjusting screw, which penetrates through the groove and is threadedly connected to the sliding seat. The adjusting screw adjusts the movement of the sliding seat in the groove. A bearing seat is arranged above the sliding seat, and the roll ring is arranged on the bearing seat, and the roll ring is coaxially connected to the roll shaft.

[0013] Preferably, the movement mechanism includes multiple groups of roll shaft assemblies, a front plate, and a rear plate. The multiple groups of roll shaft assemblies are evenly arranged in a circular pattern between the front plate and the rear plate, and each roll shaft assembly is rotatably arranged with the front plate and the rear plate. One end of the swing arm is provided with a hinge shaft I, and the roll shaft assembly is rotationally connected to the front plate and the rear plate through the hinge shaft I.

[0014] Preferably, a driving device is arranged at the other end of the swing arm, and the driving device drives the roll shaft assembly to swing around the hinge shaft I. The driving device is a press, and the press is provided with a hinge shaft II and is connected to the front plate and the rear plate through the hinge shaft II. A hinge shaft III is arranged at the end of the lead screw of the press, and the lead screw is rotationally connected to the swing arm through the hinge shaft III.

[0015] Preferably, the interior of the machine base is a cavity, and the movement mechanism is arranged inside the machine base. A reduction motor equal in number to the roll shaft assemblies is externally matched and arranged on the machine base. The reduction motor is drivingly connected to a transmission shaft, and the other end of the transmission shaft is connected to a roll shaft.

[0016] Preferably, a hoisting elevator is arranged on the upper part of the machine base. The end of the lead screw of the hoisting elevator is connected to a sprocket, and a chain is matched and arranged on the sprocket. The other end of the chain can be connected to the movement mechanism, and the hoisting elevator is connected to the movement mechanism through the sprocket and the chain.

[0017] Preferably, two guide rails are symmetrically arranged at a position near the bottom of the machine base. A trolley is arranged on each guide rail, and a guide rail is arranged below the trolley, and the trolley slides on the guide rail.

[0018] Preferably, a roll changing method for a three-roll rolling mill, which is used for changing rolls of a three-roll rolling mill, includes the following steps;

[0019] S1. Detach the movement mechanism from the rolling mill. The hoisting elevator is connected to the movement mechanism through the sprocket and the chain and is pre-tightened to a certain extent to ensure tension.

[0020] S2. Disassemble the transmission shaft from the roll shaft, disassemble the connection between the rear plate of the movement mechanism and the machine base. The hoisting elevator drives the movement mechanism to descend. After placing the movement mechanism on the trolley, the chain is disconnected from the movement mechanism. After the movement mechanism is horizontally displaced a certain distance, it is lifted off the rolling mill, and after being placed horizontally, the front plate is removed, the hinge shaft and the bearing seat are removed in sequence, and finally the roll ring is replaced.

[0021] S3. When assembling the movement mechanism to the rolling mill after replacing the roll ring; install the roll ring and the bearing seat structural parts in sequence. If the diameter of the roll ring changes, the adjusting screw of the roll group needs to be adjusted to ensure that the center position of the roll ring pass is unchanged. After installing the movement mechanism, the movement mechanism is reinstalled into the rolling mill in the reverse order of disassembly.

[0022] Preferably, the roll shaft assembly is the core component of the rolling mill. Its main structure includes a roll ring fixedly installed on the roll shaft, bearing seats are arranged on both sides of the roll ring, and the bearing seats are fixedly installed on the sliding seat. After the roll ring is ground, its diameter changes. To ensure the centering position of the three roll rings, the sliding seat can slide horizontally on the swing arm under the action of the adjusting screw. After the roll diameter changes, adjust the horizontal position as needed and then fix it firmly. The core mainly consists of three groups of roll shaft assemblies, a front plate, and a rear plate. The front plate and the rear plate are connected together by several hinge shafts before and after.

[0023] The three groups of roll shaft assemblies are evenly distributed in a circle and are hinged by hinge shaft one. Three groups of presses are evenly distributed in a circle at corresponding positions and are hinged by hinge shaft two. At the same time, the other end of the roll shaft assembly is hinged to the corresponding press screw rod. The extension or retraction of the press screw rod can drive the roll shaft assembly to swing around hinge shaft one, thereby realizing the pressing-down action.

[0024] The overall structure of the rolling mill includes a core, a housing, and a transmission system. Among them, the core is fixedly connected to the housing by bolts on the rear plate. Three groups of reduction motors are evenly distributed in a circle corresponding to the housing. The output ends of the reduction motors are respectively connected to the roll shafts of the roll shaft assemblies by universal shafts to realize the main drive of the rolling mill.

[0025] A hoisting elevator is also arranged in the upper left part of the housing. When changing rolls, the screw rod of the hoisting elevator is connected to the core through a sprocket and a chain, and can lift the core and lower it to a certain distance and place it on the trolley below. Similarly, when installing the core, the core can be lifted and raised to a certain height.

[0026] Two guide rails are also arranged on the left and right of the lower part of the housing. Trolleys are respectively arranged on the guide rails. After the core is placed on the trolley when changing rolls, the trolley can drive the core to move horizontally a certain distance, and then lift it off the rolling mill for roll changing operation.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention relates to a three-roll rolling mill and a roll changing method thereof. A driving structure is arranged within a limited space structure. After the steel bars are rolled and formed, it is no longer necessary to pass through the traction rolls and the straightening mechanism, and the outer circle of the steel bars is no longer worn, ensuring the product quality; improving the cold rolling efficiency of cold-rolled steel bars; and through the arranged roll changing method, the roll changing operation can be carried out efficiently, greatly improving the roll changing efficiency. Description of the Drawings

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0030] Figure 1 is a schematic structural diagram of the roller assembly of the present invention.

[0031] Figure 2 is a schematic structural diagram of the movement of the present invention.

[0032] Figure 3 is a schematic structural diagram of the overall rolling mill of the present invention. Specific Embodiments

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, not specifically referring to the order or sequence, nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Embodiment:

[0037] Reference Figures 1 - 3, A three-roll mill, comprising three sets of roll shaft assemblies. The three sets of roll shaft assemblies are arranged on the machine core, and the three sets of roll shaft assemblies are circumferentially arranged on the machine core; the roll shaft assembly includes a roll ring 5, the roll ring 5 is rotatably arranged on the sliding seat 2, and the roll ring 5 is connected to the roll shaft 3; the roll shaft assembly is connected with a press 8, and the press 8 is used to drive the roll shaft assembly. An outer frame 13 is provided outside the machine core, and a reduction motor 14 is provided on the outer side wall of the outer frame 13. The reduction motor 14 is used to drive the roll ring 5 of the roll shaft assembly to rotate.

[0038] The roll shaft assembly further includes a swing arm 1. The swing arm 1 is provided with a groove for placing the sliding seat 2, and the sliding seat 2 can move and adjust along the length direction of the swing arm 1 in the groove. The swing arm 1 is provided with an adjusting screw 6. The adjusting screw 6 is arranged through the groove, and the adjusting screw 6 is threadedly connected with the sliding seat 2. The adjusting screw 6 adjusts the movement of the sliding seat 2 in the groove; a bearing seat 4 is provided above the sliding seat 2, the roll ring 5 is arranged on the bearing seat 4, and the roll ring 5 is coaxially connected to the roll shaft 3.

[0039] Reference Figure 1 , The roll shaft assembly is the core component of the rolling mill. Its main structure includes a roll ring 5 fixedly installed on the roll shaft 3. Bearing seats 4 are arranged on both sides of the roll ring 5, and the bearing seats 4 are fixedly installed on the sliding seat 2. After the roll ring 5 is ground, its diameter changes. To ensure the centering position of the three roll rings 5, the sliding seat 2 can slide horizontally on the swing arm 1 under the action of the adjusting screw 6. After the roll diameter changes, adjust the horizontal position as needed and then fix it firmly. The machine core is mainly composed of three sets of roll shaft assemblies, a front plate, and a rear plate 7. The front plate and the rear plate 7 are connected together by several hinge shafts front and back.

[0040] Reference Figure 2 , ( Figure 2 The front plate is not drawn in []. The machine core includes three sets of roll shaft assemblies, a front plate, and a rear plate 7. The three sets of roll shaft assemblies are evenly circumferentially arranged between the front plate and the rear plate 7, and each roll shaft assembly is rotatably arranged with the front plate and the rear plate 7; one end of the swing arm 1 is provided with a hinge shaft one 9, and the roll shaft assembly is rotationally connected to the front plate and the rear plate 7 through the hinge shaft one 9. The other end of the swing arm is provided with a driving device, and the driving device drives the roll shaft assembly to swing around the hinge shaft one 9; the driving device is a press 8. The press 8 is provided with a hinge shaft two 10 and is connected to the front plate and the rear plate 7 through the hinge shaft two 10. The end of the screw rod of the press 8 is provided with a hinge shaft three 11, and the screw rod is rotationally connected to the swing arm through the hinge shaft three 11.

[0041] The three sets of roll shaft assemblies are circumferentially evenly distributed and are articulated by the hinge shaft one 9. Three sets of presses 8 are circumferentially evenly arranged at corresponding positions and are articulated by the hinge shaft two 10. At the same time, the other end of the roll shaft assembly is articulated with the screw rod of the corresponding press 8. The extension or retraction of the screw rod of the press 8 can drive the roll shaft assembly to swing around the hinge shaft one 9, thereby realizing the pressing-down action.

[0042] The overall structure of the rolling mill includes a core, a housing 13 and a transmission system. Among them, the core is fixedly connected to the housing 13 by bolts on the rear plate 7. Three groups of reduction motors 14 are evenly arranged circumferentially on the housing 13. The output ends of the reduction motors 14 are respectively connected to the roller shafts 3 of the roller shaft assembly by universal shafts to achieve the main drive of the rolling mill.

[0043] As an implementable mode, the inside of the housing 13 is a cavity. The core is arranged inside the housing 13. Outside the housing 13, there are reduction motors 14 equal in number to the roller shaft assembly. The reduction motors 14 are drivingly connected to the transmission shafts 12, and the other ends of the transmission shafts 12 are connected to the roller shafts 3. A hoisting elevator 15 is provided on the upper part of the housing 13. The end of the lead screw of the hoisting elevator 15 is connected to a sprocket 16. A chain is matched with the sprocket 16, and the other end of the chain can be connected to the core. The hoisting elevator 15 is connected to the core through the sprocket 16 and the chain.

[0044] Two guide rails 17 are symmetrically provided at positions near the bottom of the housing 13. On each of the guide rails 17, there is a trolley 18. Below the trolley 18, there is a guide rail 17, and the trolley 18 slides on the guide rail 17.

[0045] A hoisting elevator 15 is also provided in the upper left part of the housing 13. When changing the rolls, the lead screw of the hoisting elevator 15 is connected to the core through the sprocket 16 and the chain, and can lift the core and lower it to a certain distance and place it on the lower trolley 18. Similarly, when installing the core, the core can be lifted and raised to a certain height.

[0046] Reference Figure 3 , two guide rails 17 are also arranged horizontally at the lower part of the housing 13. On each of the guide rails 17, there is a trolley 18. After the core is placed on the trolley 18 when changing the rolls, the trolley 18 can drive the core to move horizontally a certain distance, and then the core is lifted off the rolling mill for roll changing operation.

[0047] As an implementable mode, a roll changing method for a three-roll rolling mill is used to change the rolls of a three-roll rolling mill according to any one of claims 1-8, and includes the following steps;

[0048] S1, detach the core from the rolling mill. The hoisting elevator 15 is connected to the core through the sprocket 16 and the chain, and is pre-tightened to a certain extent to ensure tension;

[0049] S2, disassemble the transmission shaft 12 from the roller shaft 3, disassemble the connection between the rear plate 7 of the core and the housing 13. The hoisting elevator 15 drives the core to descend. After the core is placed on the trolley 18, the chain is disconnected from the core. After the core moves horizontally a certain distance, it is lifted off the rolling mill, placed horizontally, the front plate is removed, the hinge shaft and the bearing block 4 are removed in sequence, and finally the roll ring 5 is replaced;

[0050] S3. When assembling the core unit into the rolling mill after replacing the roll ring 5: successively install the roll ring 5 and the bearing housing 4 structural members. If the diameter of the roll ring 5 changes, it is necessary to adjust the adjusting screw 6 of the roll group to ensure that the pass center position of the roll ring 5 remains unchanged. After installing the core unit, install the core unit back into the rolling mill in the reverse order of disassembly.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A three-roll rolling mill, comprising multiple sets of roll shaft assemblies, characterized in that, The multiple sets of roller shaft assemblies are arranged on the movement, and the multiple sets of roller shaft assemblies are arranged in a circle on the movement; The roller shaft assembly includes a roller ring (5), and the roller ring (5) is rotatably arranged on the sliding seat (2), and the roller ring (5) is connected to the roller shaft (3); The roller shaft assembly is connected with a press (8), and the press (8) is used to drive the roller shaft assembly; A machine base (13) is arranged outside the movement, and a reduction motor (14) is arranged on the outer side wall of the machine base (13), and the reduction motor (14) is used to drive the roller ring (5) of the roller shaft assembly to rotate.

2. The three-roll rolling mill according to claim 1, characterized in that, The roller shaft assembly further includes a swing arm (1), and the swing arm (1) is provided with a groove for placing the sliding seat (2), and the sliding seat (2) can move and adjust along the length direction of the swing arm (1) in the groove.

3. A three-roll rolling mill according to claim 2, wherein, The swing arm (1) is provided with an adjusting screw (6), the adjusting screw (6) is arranged through the groove, and the adjusting screw (6) is connected to the sliding seat (2) in a threaded manner, and the adjusting screw (6) adjusts the movement of the sliding seat (2) in the groove; a bearing seat (4) is arranged above the sliding seat (2), the roller ring (5) is arranged on the bearing seat (4), and the roller ring (5) is coaxially connected to the roller shaft (3).

4. A three-roll rolling mill according to claim 2, characterized in that, The movement includes multiple sets of roller shaft assemblies, a front plate, and a rear plate (7). The multiple sets of roller shaft assemblies are evenly arranged in a circle between the front plate and the rear plate (7), and each roller shaft assembly is rotatably arranged with the front plate and the rear plate (7); one end of the swing arm (1) is provided with a hinge shaft one (9), and the roller shaft assembly is rotationally connected to the front plate and the rear plate (7) through the hinge shaft one (9).

5. A three-roll rolling mill according to claim 4, characterized in that The other end of the swing arm (1) is provided with a driving device, and the driving device drives the roller shaft assembly to swing around the hinge shaft one (9); the driving device is a press (8), the press (8) is provided with a hinge shaft two (10), and is connected to the front plate and the rear plate (7) through the hinge shaft two (10), and the end of the lead screw of the press (8) is provided with a hinge shaft three (11), and the lead screw is rotationally connected to the swing arm (1) through the hinge shaft three (11).

6. The three-roll rolling mill according to claim 1, wherein, The inside of the machine base (13) is a cavity, the movement is arranged inside the machine base (13), and the outside of the machine base (13) is matched with a reduction motor (14) equal to the number of roller shaft assemblies. The reduction motor (14) is drivingly connected to a transmission shaft (12), and the other end of the transmission shaft (12) is connected to a roller shaft (3).

7. A three-roll rolling mill according to claim 1, characterized in that, A hoisting elevator (15) is arranged on the upper part of the machine base (13), the end of the lead screw of the hoisting elevator (15) is connected with a sprocket (16), a chain is matched on the sprocket (16), and the other end of the chain can be connected to the movement. The hoisting elevator (15) is connected to the movement through the sprocket (16) and the chain.

8. A three-roll rolling mill according to claim 1, characterized in that, Two guide rails (17) are symmetrically arranged at a position near the bottom of the machine base (13), a trolley (18) is arranged on each of the guide rails (17), the trolley (18) is provided with a guide rail (17) below, and the trolley (18) slides on the guide rail (17).

9. A roll changing method for a three-roll rolling mill, which is used for changing the rolls of the three-roll rolling mill according to any one of claims 1-8, characterized in that, Including the following steps: S1, detach the movement from the rolling mill, connect the hoisting elevator to the movement through the sprocket and the chain, and pre-tighten to a certain extent to ensure the tension; S2. Disconnect the drive shaft from the roller shaft, disassemble the connection between the rear plate of the machine core and the machine base, hoist the elevator to drive the machine core to descend. After placing the machine core on the trolley, disconnect the chain from the machine core. After the machine core is horizontally displaced by a certain distance, lift it off the rolling mill, place it horizontally, remove the front plate, remove the hinge shaft and bearing block in sequence, and finally replace the roll ring. S3. When assembling the machine core to the rolling mill after replacing the roll ring, install the roll ring and bearing block structural parts in sequence. If the diameter of the roll ring changes, adjust the adjusting screw of the roll group to ensure that the center position of the roll ring pass is unchanged. After installing the machine core, install the machine core back into the rolling mill in the reverse order of disassembly.

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