Cold rolling device for stainless steel plate production

Abstract

The utility model discloses a cold rolling device for stainless steel plate production, which relates to the technical field of cold rolling devices, and comprises a bottom plate, a first transition roller, a second transition roller, a main roller, an auxiliary roller and a placing rack. By arranging the first transition roller and the second transition roller, limiting on the second transition roller can be relieved, the distance between the first transition roller and the second transition roller can be adjusted by moving the second transition roller up and down, and therefore stainless steel plates with different thicknesses can be cold-rolled; a third servo motor is controlled to drive a bidirectional threaded rod to rotate so as to drive an auxiliary roller to move upwards or downwards, and therefore the distance between a main roller and the auxiliary roller can be adjusted according to the thickness of a stainless steel plate obtained after cold rolling, and an electric telescopic rod is arranged and can be controlled to drive a containing frame to move left and right; and therefore, the cold-rolled stainless steel plate is prevented from being deformed or bent.

Description

Technical Field

[0001] The utility model relates to the technical field of cold rolling devices, in particular to a cold rolling device for producing stainless steel plates. Background Art

[0002] Cold rolling uses hot-rolled steel coils as raw materials, and then undergoes cold continuous rolling after pickling to remove the oxide scale. The finished product is a hard rolled coil. The cold work hardening caused by continuous cold deformation increases the strength and hardness of the hard rolled coil, and reduces the toughness and plasticity index. Therefore, the stamping performance will deteriorate and it can only be used for parts with simple deformation. The cold rolling formed by hot rolling and continuous cold deformation has relatively poor mechanical properties and too high hardness. It must be annealed to restore its mechanical properties. The coil without annealing is called a hard rolled coil. Hard rolled coil is generally used to make products that do not require bending or stretching.

[0003] For example, a cold rolling device for producing stainless steel plates is disclosed in the utility model with authorization announcement number CN216679569U, which sets transition rollers one and two to limit the steel plates to prevent them from running off the track and tilting, sets a placement rack to support the cold-rolled steel plates to prevent them from sinking and deforming, and sets a laser thickness gauge and an operation panel to measure the thickness of the steel plates to avoid different thicknesses of subsequent steel plates.

[0004] This prior art also has the following problems when used:

[0005] The distance between transition roller 1 and transition roller 2 of the device remains unchanged, which makes it difficult for the device to cold roll stainless steel plates of different thicknesses. The distance between the main rolling roller and the auxiliary rolling roller of the device remains unchanged, which makes it difficult for the device to adjust the thickness of the stainless steel plate after cold rolling, and the applicability is poor. The distance between the placement rack and the U-shaped rack of the device remains unchanged. When the distance between the placement rack and the U-shaped rack is too large, the stainless steel plate between the placement rack and the U-shaped rack is prone to deformation or bending. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a cold rolling device for producing stainless steel plates to solve the technical problems mentioned in the above background.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a cold rolling device for producing stainless steel plates, comprising a bottom plate, a first transition roller, a second transition roller, a main rolling roller, an auxiliary rolling roller and a placement frame, wherein the first transition roller and the second transition roller and the main rolling roller and the auxiliary rolling roller arranged in an upper and lower manner are arranged above the bottom plate, and a placement frame is arranged above the bottom plate;

[0008] A first lifting assembly, which is arranged at the front and rear sides of the second transition roller, and can drive the second transition roller to move up and down;

[0009] A second lifting assembly, which is disposed between the auxiliary roller and the bottom plate, and can drive the auxiliary roller to move up and down;

[0010] An electric telescopic rod is arranged above the bottom plate, and the electric telescopic rod can drive the placement rack to move left and right.

[0011] As a preferred technical solution of the utility model, a symmetrical first support frame is fixedly arranged on the top surface of the bottom plate, a first servo motor is fixedly installed on the outside of the first support frame, the output end of the first servo motor passes through the first support frame and is rotatably connected to the first support frame, the front face of the output end of the first servo motor is fixedly connected to the first transition roller, the front face of the first transition roller is rotatably connected to the first support frame through a bearing, a first U-shaped mounting frame is fixedly arranged on the top surface of the bottom plate, a second servo motor is fixedly installed on the outside of the first U-shaped mounting frame, a first rotating shaft is fixedly arranged on the output end end of the second servo motor, the other end of the first rotating shaft is rotatably connected to the first U-shaped mounting frame through a bearing, the outside of the first rotating shaft is fixedly connected to the main rolling roller, a symmetrical second support frame is slidably connected to the top surface of the bottom plate, the inner side of the second support frame is fixedly connected to the placement frame, an L-shaped slider is fixedly arranged on the outside of the second support frame, and slide grooves adapted to the transverse part of the L-shaped slider are symmetrically arranged on the front and rear sides of the bottom plate, the L-shaped slider is slidably connected to the bottom plate through the slide groove, an electric telescopic rod is fixedly installed on the side of the first U-shaped mounting frame, and the output end end of the electric telescopic rod is fixedly connected to the second support frame.

[0012] As a preferred technical solution of the utility model, the first lifting assembly includes a handle, a pull plate, a pull rod, a spring, a limit rod, a limit plate and a lifting block, symmetrical lifting blocks are fixedly arranged on the front and rear sides of the second transition roller, a spring is fixedly arranged on the outside of the lifting block, a pull plate is fixedly arranged on the other end of the spring, a handle is fixedly arranged on the outside of the pull plate, a pull rod and a symmetrical limit rod are fixedly arranged on the inside of the pull plate, and a limit plate is fixedly arranged on the end of the pull rod away from the pull plate.

[0013] As a preferred technical solution of the utility model, a limit groove adapted to the limit plate is provided inside the lifting block, the limit plate is slidably connected to the lifting block through the limit groove, the pull rod passes through the lifting block to the inside of the limit groove, the pull rod is slidably connected to the lifting block, slots adapted to the limit rods are symmetrically provided in a linear array on the outside of the first support frame, the limit rod is slidably connected to the first support frame through the slot, a vertical groove adapted to the lifting block is provided on the side of the first support frame, and the lifting block is slidably connected to the first support frame through the vertical groove.

[0014] As a preferred technical solution of the utility model, the second lifting assembly includes a third servo motor, a bidirectional threaded rod, a threaded sleeve, a connecting rod and a second U-shaped mounting frame. The third servo motor is fixedly installed on the outside of the first U-shaped mounting frame, and the output end of the third servo motor passes through the first U-shaped mounting frame and is rotatably connected to the first U-shaped mounting frame. A bidirectional threaded rod is fixedly arranged on the end of the output end of the third servo motor, and a symmetrical threaded sleeve is threadedly connected to the outside of the bidirectional threaded rod. A connecting rod is hinged on the top surface of the threaded sleeve, and the other end of the connecting rod is hinged to the second U-shaped mounting frame.

[0015] As a preferred technical solution of the utility model, the end of the bidirectional threaded rod away from the third servo motor is rotatably connected to the first U-shaped mounting frame through a bearing, the bottom surface of the threaded sleeve is slidably connected to the bottom plate, the outer side of the second U-shaped mounting frame is slidably connected to the inner side of the first U-shaped mounting frame, the inner side of the second U-shaped mounting frame is rotatably connected to the second rotating shaft through a bearing, and the outer side of the second rotating shaft is fixedly connected to the auxiliary roller.

[0016] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0017] The utility model sets a first lifting component and pulls the handle to drive the limit rod to disengage from the slot at the same time, so as to release the limit on the second transition roller. The second transition roller can be moved up and down to adjust the distance between the first transition roller and the second transition roller, so that stainless steel plates of different thicknesses can be cold rolled. By setting a second lifting component, the third servo motor is controlled to drive the bidirectional threaded rod to rotate, so as to drive the threaded sleeves to approach or move away from each other. The movement of the threaded sleeve drives the connecting rod to rotate at the same time. The rotation of the connecting rod drives the auxiliary roller to move upward or downward, so as to adjust the distance between the main roller and the auxiliary roller according to the thickness of the stainless steel plate after cold rolling. By setting an electric telescopic rod, the electric telescopic rod can be controlled to drive the placement rack to move left and right, so as to avoid deformation or bending of the stainless steel plate after cold rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model in top view;

[0020] Figure 3 For this utility model Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0021] Figure 4 It is a left view structural schematic diagram of the utility model;

[0022] Wherein: 1. bottom plate; 2. first support frame; 3. first servo motor; 4. first transition roller; 5. second transition roller; 6. first U-shaped mounting frame; 7. main rolling roller; 8. auxiliary rolling roller; 9. second support frame; 10. placement frame; 11. handle; 12. pull plate; 13. pull rod; 14. spring; 15. limit rod; 16. limit plate; 17. lifting block; 18. second servo motor; 19. third servo motor; 20. bidirectional threaded rod; 21. threaded sleeve; 22. connecting rod; 23. second U-shaped mounting frame; 24. electric telescopic rod; 25. L-shaped slider. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0024] Example

[0025] Please refer to Figure 1-Figure 4 As shown, the utility model provides a cold rolling device for stainless steel plate production, including a bottom plate 1, a first transition roller 4, a second transition roller 5, a main rolling roller 7, an auxiliary rolling roller 8 and a placing frame 10. A symmetrical first supporting frame 2 is fixedly arranged on the top surface of the bottom plate 1, a first servo motor 3 is fixedly installed on the outer side of the first supporting frame 2, an output end of the first servo motor 3 passes through the first supporting frame 2 and is rotatably connected to the first supporting frame 2, a first transition roller 4 is fixedly arranged on the front side of the output end of the first servo motor 3, the front side of the first transition roller 4 is rotatably connected to the first supporting frame 2 through a bearing, a second transition roller 5 is arranged below the first transition roller 4, the first servo motor 3 can be controlled to drive the first transition roller 4 to rotate, and the first transition roller 4 cooperates with the second The transition roller 5 can limit the stainless steel plate to prevent the steel plate from tilting. A first U-shaped mounting frame 6 is fixedly arranged on the top surface of the bottom plate 1. A second servo motor 18 is fixedly arranged on the outside of the first U-shaped mounting frame 6. A first rotating shaft is fixedly arranged on the output end of the second servo motor 18. The other end of the first rotating shaft is rotatably connected to the first U-shaped mounting frame 6 through a bearing. A main rolling roller 7 is fixedly arranged on the outside of the first rotating shaft. An auxiliary rolling roller 8 is arranged below the main rolling roller 7. Controlling the second servo motor 18 can drive the first rotating shaft and the main rolling roller 7 to rotate. The rotation of the main rolling roller 7 and the auxiliary rolling roller 8 can perform cold rolling on the stainless steel plate. A placing frame 10 is arranged above the bottom plate 1, and the placing frame 10 can support the stainless steel plate after cold rolling.

[0026] like Figure 1-Figure 2As shown, a symmetrical second support frame 9 is slidably connected to the top surface of the base plate 1, the inner side of the second support frame 9 is fixedly connected to the placement frame 10, an L-shaped slider 25 is fixedly arranged on the outer side of the second support frame 9, and sliding grooves adapted to the lateral parts of the L-shaped slider 25 are symmetrically arranged on the front and rear sides of the base plate 1, and the L-shaped slider 25 is slidably connected to the base plate 1 through the sliding grooves, and an electric telescopic rod 24 is fixedly installed on the side of the first U-shaped mounting frame 6, and the output end of the electric telescopic rod 24 is fixedly connected to the second support frame 9. Controlling the electric telescopic rod 24 can drive the second support frame 9 to move left and right, and the movement of the second support frame 9 drives the placement frame 10 to move left and right, so that the distance between the first U-shaped mounting frame 6 and the placement frame 10 can be adjusted to avoid deformation or bending of the stainless steel plate after cold rolling.

[0027] like Figure 1-Figure 3 As shown, the first lifting assembly is arranged on the front and rear sides of the second transition roller 5, and the first lifting assembly is composed of a handle 11, a pull plate 12, a pull rod 13, a spring 14, a limit rod 15, a limit plate 16 and a lifting block 17. Symmetrical lifting blocks 17 are fixedly arranged on the front and rear sides of the second transition roller 5. A vertical groove adapted to the lifting block 17 is penetrated through the side of the first support frame 2. The lifting block 17 is slidably connected to the first support frame 2 through the vertical groove. A spring 14 is fixedly arranged on the outer side of the lifting block 17, and a pull plate 12 is fixedly arranged on the other end of the spring 14. A handle 11 is fixedly arranged on the outer side of the pull plate 12, and a pull rod 13 and a symmetrical limit rod 15 are fixedly arranged on the inner side of the pull plate 12. The outer side of the first support frame 2 is linear The array is symmetrically provided with slots adapted to the limit rod 15, and the limit rod 15 is slidably connected to the first support frame 2 through the slots. A limit plate 16 is fixedly provided at the end of the pull rod 13 away from the pull plate 12, and a limit groove adapted to the limit plate 16 is provided inside the lifting block 17. The limit plate 16 is slidably connected to the lifting block 17 through the limit groove. The pull rod 13 penetrates the lifting block 17 to the inside of the limit groove, and the pull rod 13 is slidably connected to the lifting block 17. At the same time, pulling the handle 11 drives the limit rod 15 to disengage from the slot, which can release the limitation of the second transition roller 5. Moving the second transition roller 5 up and down can adjust the distance between the first transition roller 4 and the second transition roller 5, so that stainless steel plates of different thicknesses can be cold rolled.

[0028] Specifically, pulling the handle 11 at the same time drives the handle 11 to move outward, and the movement of the handle 11 drives the pull plate 12, the pull rod 13, the limit rod 15 and the limit plate 16 to move outward. The spring 14 is stretched, and the limit plate 16 can prevent the pull rod 13 from disengaging from the lifting block 17 when moving outward. When the limit rod 15 disengages from the slot, moving the handle 11 up and down can drive the lifting block 17 and the second transition roller 5 to move up and down, thereby adjusting the distance between the second transition roller 5 and the first transition roller 4. When the adjustment is completed, the limit rod 15 is aligned with the slot, and the handle 11 is released to allow the spring 14 to pull the pull plate 12 and move inward at the same time, thereby driving the limit rod 15 to engage with the inside of the slot and re-limit the position of the second transition roller 5.

[0029] like Figure 1-Figure 4 As shown, a second lifting assembly is arranged between the auxiliary roller 8 and the bottom plate 1, and the second lifting assembly is composed of a third servo motor 19, a bidirectional threaded rod 20, a threaded sleeve 21, a connecting rod 22 and a second U-shaped mounting frame 23. The third servo motor 19 is fixedly installed on the outside of the first U-shaped mounting frame 6, and the output end of the third servo motor 19 passes through the first U-shaped mounting frame 6 and is rotatably connected to the first U-shaped mounting frame 6. A bidirectional threaded rod 20 is fixedly arranged on the end of the output end of the third servo motor 19, and one end of the bidirectional threaded rod 20 away from the third servo motor 19 is rotatably connected to the first U-shaped mounting frame 6 through a bearing, and a symmetrical threaded sleeve 21 is threadedly connected to the outside of the bidirectional threaded rod 20, and the bottom surface of the threaded sleeve 21 is connected to the bottom The plate 1 is slidably connected, and a connecting rod 22 is hinged on the top surface of the threaded sleeve 21. The other end of the connecting rod 22 is hinged to a second U-shaped mounting frame 23. The outer side of the second U-shaped mounting frame 23 is slidably connected to the inner side of the first U-shaped mounting frame 6. The inner side of the second U-shaped mounting frame 23 is rotatably connected to a second rotating shaft through a bearing. The outer side of the second rotating shaft is fixedly connected to the auxiliary rolling roller 8. Controlling the third servo motor 19 to drive the bidirectional threaded rod 20 to rotate can drive the threaded sleeves 21 to approach or move away from each other. The movement of the threaded sleeve 21 drives the connecting rod 22 to rotate at the same time. The rotation of the connecting rod 22 drives the auxiliary rolling roller 8 to move upward or downward, so that the spacing between the main rolling roller 7 and the auxiliary rolling roller 8 can be adjusted according to the thickness of the stainless steel plate after cold rolling.

[0030] Specific working principle:

[0031] When the device is in use, the first servo motor 3 is controlled to drive the first transition roller 4 to rotate, and the second servo motor 18 is controlled to drive the main roller 7 to rotate, so that the stainless steel plate passes between the first transition roller 4 and the second transition roller 5. The first transition roller 4 cooperates with the second transition roller 5 to limit the stainless steel plate to prevent the steel plate from tilting. The main roller 7 rotates and cooperates with the auxiliary roller 8 to cold-roll the stainless steel plate. The placement rack 10 supports the cold-rolled stainless steel plate. The electric telescopic rod 24 is controlled to drive the second support rack 9 to move left and right. The movement of the second support rack 9 drives the placement rack 10 to move left and right, thereby adjusting the distance between the first U-shaped mounting rack 6 and the placement rack 10 to avoid deformation or bending of the stainless steel plate after cold rolling.

[0032] When it is necessary to adjust the spacing between the first transition roller 4 and the second transition roller 5, pull the handle 11 at the same time to drive the handle 11 to move outward. The movement of the handle 11 drives the pull plate 12, the pull rod 13, the limit rod 15 and the limit plate 16 to move outward. The spring 14 is stretched, and the limit plate 16 can prevent the pull rod 13 from disengaging from the lifting block 17 when moving outward. When the limit rod 15 disengages from the slot, moving the handle 11 up and down can drive the lifting block 17 and the second transition roller 5 to move up and down, thereby adjusting the spacing between the second transition roller 5 and the first transition roller 4. When the adjustment is completed, the limit rod 15 is aligned with the slot, and the handle 11 is released to allow the spring 14 to pull the pull plate 12 and move inward at the same time, thereby driving the limit rod 15 to engage with the inside of the slot and re-limit the position of the second transition roller 5.

[0033] When the spacing between the main roller 7 and the auxiliary roller 8 needs to be adjusted, the third servo motor 19 is controlled to drive the bidirectional threaded rod 20 to rotate, which can drive the threaded sleeves 21 to move closer to or away from each other. The movement of the threaded sleeve 21 drives the connecting rod 22 to rotate at the same time. The rotation of the connecting rod 22 drives the auxiliary roller 8 to move upward or downward, so that the spacing between the main roller 7 and the auxiliary roller 8 can be adjusted according to the thickness of the stainless steel plate after cold rolling.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A cold rolling device for producing stainless steel plates, comprising a bottom plate (1), a first transition roller (4), a second transition roller (5), a main rolling roller (7), an auxiliary rolling roller (8) and a placement rack (10), wherein the first transition roller (4) and the second transition roller (5) and the main rolling roller (7) and the auxiliary rolling roller (8) are arranged in an upper and lower arrangement above the bottom plate (1), and a placement rack (10) is arranged above the bottom plate (1), characterized in that: A first lifting assembly, the first lifting assembly being arranged at both sides of the second transition roller (5) in front and behind, and the first lifting assembly being able to drive the second transition roller (5) to move up and down; A second lifting assembly, the second lifting assembly is arranged between the auxiliary roller (8) and the bottom plate (1), and the second lifting assembly can drive the auxiliary roller (8) to move up and down; An electric telescopic rod (24), wherein the electric telescopic rod (24) is arranged above the bottom plate (1), and the electric telescopic rod (24) can drive the placement rack (10) to move left and right.

2. A cold rolling device for producing stainless steel plates according to claim 1, characterized in that: A symmetrical first support frame (2) is fixedly arranged on the top surface of the bottom plate (1), a first servo motor (3) is fixedly installed on the outer side of the first support frame (2), an output end of the first servo motor (3) passes through the first support frame (2) and is rotatably connected to the first support frame (2), a front face of the output end of the first servo motor (3) is fixedly connected to a first transition roller (4), a front face of the first transition roller (4) is rotatably connected to the first support frame (2) via a bearing, a first U-shaped mounting frame (6) is fixedly arranged on the top surface of the bottom plate (1), a second servo motor (18) is fixedly installed on the outer side of the first U-shaped mounting frame (6), a first rotating shaft is fixedly arranged at the end of the output end of the second servo motor (18), The other end of the first rotating shaft is rotatably connected to the first U-shaped mounting frame (6) through a bearing, the outer side of the first rotating shaft is fixedly connected to the main rolling roller (7), the top surface of the bottom plate (1) is slidably connected to a symmetrical second supporting frame (9), the inner side of the second supporting frame (9) is fixedly connected to the placement frame (10), an L-shaped slider (25) is fixedly arranged on the outer side of the second supporting frame (9), and sliding grooves adapted to the transverse part of the L-shaped slider (25) are symmetrically arranged on the front and rear sides of the bottom plate (1), and the L-shaped slider (25) is slidably connected to the bottom plate (1) through the sliding grooves, and an electric telescopic rod (24) is fixedly installed on the side of the first U-shaped mounting frame (6), and the output end of the electric telescopic rod (24) is fixedly connected to the second supporting frame (9).

3. A cold rolling device for producing stainless steel plates according to claim 2, characterized in that: The first lifting assembly comprises a handle (11), a pull plate (12), a pull rod (13), a spring (14), a limit rod (15), a limit plate (16) and a lifting block (17); symmetrical lifting blocks (17) are fixedly arranged on the front and rear sides of the second transition roller (5); a spring (14) is fixedly arranged on the outer side of the lifting block (17); a pull plate (12) is fixedly arranged on the other end of the spring (14); a handle (11) is fixedly arranged on the outer side of the pull plate (12); a pull rod (13) and symmetrical limit rods (15) are fixedly arranged on the inner side of the pull plate (12); and a limit plate (16) is fixedly arranged on the end of the pull rod (13) away from the pull plate (12).

4. A cold rolling device for producing stainless steel plates according to claim 3, characterized in that: The lifting block (17) is provided with a limiting groove adapted to the limiting plate (16), and the limiting plate (16) is slidably connected to the lifting block (17) through the limiting groove. The pull rod (13) passes through the lifting block (17) to the inside of the limiting groove, and the pull rod (13) is slidably connected to the lifting block (17). The outer side of the first support frame (2) is symmetrically provided with slots adapted to the limiting rod (15) in a linear array, and the limiting rod (15) is slidably connected to the first support frame (2) through the slot. A vertical groove adapted to the lifting block (17) is passed through the side of the first support frame (2), and the lifting block (17) is slidably connected to the first support frame (2) through the vertical groove.

5. The cold rolling device for producing stainless steel plates according to claim 2, characterized in that: The second lifting assembly comprises a third servo motor (19), a bidirectional threaded rod (20), a threaded sleeve (21), a connecting rod (22) and a second U-shaped mounting frame (23); the third servo motor (19) is fixedly mounted on the outer side of the first U-shaped mounting frame (6); the output end of the third servo motor (19) passes through the first U-shaped mounting frame (6) and is rotatably connected to the first U-shaped mounting frame (6); a bidirectional threaded rod (20) is fixedly mounted on the output end of the third servo motor (19); a symmetrical threaded sleeve (21) is threadedly connected on the outer side of the bidirectional threaded rod (20); a connecting rod (22) is hingedly connected to the top surface of the threaded sleeve (21); and the other end of the connecting rod (22) is hingedly connected to the second U-shaped mounting frame (23).

6. A cold rolling device for producing stainless steel plates according to claim 5, characterized in that: One end of the bidirectional threaded rod (20) away from the third servo motor (19) is rotatably connected to the first U-shaped mounting frame (6) via a bearing, the bottom surface of the threaded sleeve (21) is slidably connected to the bottom plate (1), the outer side of the second U-shaped mounting frame (23) is slidably connected to the inner side of the first U-shaped mounting frame (6), the inner side of the second U-shaped mounting frame (23) is rotatably connected to a second rotating shaft via a bearing, and the outer side of the second rotating shaft is fixedly connected to the auxiliary roller (8).

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