Pinch roll applied to bar steel rolling

Abstract

The utility model discloses a pinch roll applied to bar steel rolling, which comprises a furnace discharge table, a steel billet, a screw-down arm, an upper pinch roll, hydraulic cylinders and a lower pinch roll, the transmission mode of the pinch roll is that the lower roll is independently driven, the upper roll is the screw-down roll, and the steel billet is clamped and opened through the up and down lifting of a pair of hydraulic cylinders. The steel billets are boosted to enter a 1 # rolling mill by clamping force generated by the upper roller and the lower roller; the lower pinch roll is in linkage with a motor through transmission of a gearbox, and the motor is a 45KW asynchronous alternating-current motor; the lower pinch roll is made of high-nickel-chromium infinitely chilled IV: HSD = 72 + / -1, bearings of the upper pinch roll and the lower pinch roll are inner ring and outer ring separated four-row cylindrical roller bearings, the model is FC3652168, and a universal coupling is arranged between the speed reducer and the lower pinch roll; two hydraulic cylinders are controlled by two sets of hydraulic valves instead of one set of hydraulic valves, and the two sets of hydraulic electromagnetic valves are controlled by the same electric signal.

Description

Technical Field

[0001] The utility model relates to a pinch roller used for bar steel rolling. Background Art

[0002] Rebar is a commonly used material in engineering, and its diameter is between 14mm and 36mm. Rebar is mainly used in construction projects. At present, the hydraulic cylinder seals of the domestic and foreign bar production lines using the pinch roller process all use polyurethane as the sealing material. The rollers are made of hollow 45# material. The following problems exist during use: 1. During the use of the pinch roller, the material of the pinch roller cannot meet the use requirements, the roller surface is worn too much, and the roller body diameter becomes smaller, resulting in a decrease in the pinch force, or the billet cannot be clamped, which in turn increases the impact force on the 1# rolling mill, or the billet cannot be fed into the rolling mill and slips, and the steel temperature drops and increases the load of the rolling mill. 2. The bearing capacity of the pinch roller is poor. And working in a high temperature and humid environment, the bearing is poorly lubricated and damaged, causing the center of the upper and lower pinch rollers to produce an angle of deflection and the pinch force is lost. It cannot meet normal work. 3. The distance between the pinch roller reducer and the lower pinch roller is large, and the concentricity is not guaranteed. The deflection of the gear coupling adjustment is not guaranteed. In addition, the surrounding high temperature environment cannot keep up with the lubrication, which accelerates the wear of the teeth and finally destroys the coupling. 4. Hydraulic failure cannot clamp the billet normally. Since the pinch rollers operate in high temperature and water vapor conditions, the seals are prone to aging, which shortens the service life of the hydraulic seals and causes hydraulic cylinder leakage. Problems with the hydraulic control of the pinch rollers, the two hydraulic cylinders are not synchronized, and the pinching force of the pinch rollers on the billet is weakened. Summary of the invention

[0003] The utility model aims to provide a pinch roller used for bar steel rolling, which improves the working condition of the pinch roller, reduces the failure rate of the pinch roller and ensures normal production.

[0004] A pinch roller used for bar rolling, comprising a furnace roller table, a steel billet, a pressing arm, an upper pinch roller, a hydraulic cylinder, and a lower pinch roller. The transmission type of the pinch roller is that the lower roller is driven alone, and the upper roller is a pressing roller. The steel billet is clamped and opened by the up and down lifting of a pair of hydraulic cylinders, and the pinch force generated by the upper and lower rollers helps the steel billet enter the No. 1 rolling mill; the lower pinch roller is linked to the motor through a gear box transmission, and the motor is a 45KW asynchronous AC motor; the material of the lower pinch roller is high nickel chromium infinite cold hardening IV: HSD=72±1, and the bearings of the upper and lower pinch rollers are inner and outer ring separated Four-row cylindrical roller bearings, model FC3652168, the bearing seat is additionally provided with a skeleton seal: model 240*230*15, 230*260*15; a universal coupling is arranged between the reducer and the lower roller of the pinch roller; the hydraulic cylinder seal, the hydraulic cylinder seal material is improved, both the wear resistance and the high temperature resistance of the seal are to be ensured, and polytetrafluoroethylene seals are selected; the hydraulic cylinders are asynchronous, and one group of hydraulic valves controlling two hydraulic cylinders is changed to two groups of hydraulic valves controlling two hydraulic cylinders respectively, and the two groups of hydraulic solenoid valves are controlled by the same electrical signal.

[0005] The transmission type of the pinch roller in the utility model is that the lower roller is driven alone. The upper roller is a pressing roller, which clamps and opens the billet through the up and down lifting of a pair of hydraulic cylinders, and the pinching force generated by the upper and lower rollers helps the billet enter the No. 1 rolling mill, so as to bite smoothly. After the billet bites, the pinch roller opens quickly to end the biting work of the billet. The utility model changes the hydraulic cylinder asynchronism by changing a group of hydraulic valves controlling two hydraulic cylinders to two groups of hydraulic valves controlling two hydraulic cylinders respectively, and realizes the synchronization of the two hydraulic cylinders by adjusting the throttle valve, and the two groups of hydraulic solenoid valves are controlled by the same electrical signal. The wear resistance of the lower pinch roller is increased, the service life is extended, and no repair welding is required. After the modification, the bearing has not been replaced for 8 months, which can save 900 minutes of time throughout the year. The synchronization of the two oil cylinders is adjusted by the throttle valve, which solves the problem of the asynchronism of the two oil cylinders and increases the clamping force of the pinch roller. The maintenance intensity of the employees is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the structure of the utility model;

[0007] Figure 2 This is a hydraulic system diagram of the utility model.

[0008] 1. Upper pinch roller; 2. Universal coupling; 3. Reducer; 4. Motor; 5. Lower pinch roller; 6. Hydraulic cylinder; 7. Solenoid hydraulic control valve; 8. Throttle speed regulating valve. DETAILED DESCRIPTION

[0009] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] A pinch roll used in bar rolling, such as Figure 1 , 2 As shown, it includes a furnace roller table, a steel billet, a pressing arm, an upper pinch roller 1, a hydraulic cylinder 6, and a lower pinch roller 5. The transmission structure of the pinch roller is that the lower pinch roller 5 is driven alone, and the upper pinch roller 1 is a pressing roller. The steel billet is clamped and opened by the up and down lifting of a pair of hydraulic cylinders 6, and the pinching force generated by the upper and lower pinch rollers helps the steel billet enter the 1# rolling mill; the lower pinch roller 5 is connected to the drive shaft of the reducer 3 through the gear box transmission and the universal coupling 2, and the reducer 3 is driven by the motor 4, which is a 45KW asynchronous AC motor; the lower pinch roller 5 is made of high nickel chromium infinite cold Hard IV: HSD=72±1, the bearings of the upper and lower pinch rollers are four-row cylindrical roller bearings with separated inner and outer rings, model FC3652168, and the bearing seat is additionally provided with a skeleton seal: model 240*230*15, 230*260*15; the seal of the hydraulic cylinder 6 is a polytetrafluoroethylene seal; each hydraulic cylinder 6 is connected to the hydraulic control oil circuit through an electromagnetic hydraulic control valve 7 and a throttling speed regulating valve 8; one group of hydraulic valves controlling two hydraulic cylinders is changed to two groups of hydraulic valves controlling two hydraulic cylinders respectively, and the two groups of hydraulic solenoid valves are controlled by the same electrical signal. The asynchronous problem of the hydraulic cylinder 6 is solved.

Claims

1. A pinch roll for bar rolling, comprising an upper pinch roll, a hydraulic cylinder, and a lower pinch roll, wherein: The transmission structure of the pinch rollers is that the lower pinch roller is driven alone, and the upper pinch roller is a pressing roller. The billet is clamped and opened by the up and down lifting of a pair of hydraulic cylinders, and the pinching force generated by the upper and lower pinch rollers helps the billet enter the No. 1 rolling mill; the lower pinch roller is connected to the drive shaft of the reducer through a gear box transmission and a universal coupling, and the reducer is driven by a motor, which is a 45KW asynchronous AC motor; the material of the lower pinch roller is high nickel chromium infinite cold hardening IV: HSD=72±1, the bearings of the upper and lower pinch rollers are four-row cylindrical roller bearings with separated inner and outer rings, model FC3652168, and the bearing seat is additionally provided with a skeleton seal: model 240*230*15, 230*260*15; the seal of the hydraulic cylinder is a polytetrafluoroethylene seal; each hydraulic cylinder is connected to the hydraulic control oil circuit through an electromagnetic hydraulic control valve and a throttling speed regulating valve.

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