54results about How to "Reduce abnormal downtime" patented technology

The invention relates to an additional given virtual sheathing control method of a hot continuous rolling thin-specification movable sleeve, belonging to the field of hot continuous rolling automatic control. The method is characterized in that when the thickness of strip steel is less than 2.0mm and the strip steel rolling force load value of a rack adjacent to the strip steel is larger than the target value (300-500 tons), the rack is confirmed to bite steel in a tracking way. When the actual torque of the strip steel is less than the set torque of the strip steel, the final value given by a servo valve is calculated by a controller, and a first stage computer control signal channel acts on the servo valve, so that the servo valve acts. After the method is adopted, off tracking and waste rolling which are caused by virtual sheathing of the movable sleeve can be eliminated, and the great hidden danger of damage to mechanical equipment can be avoided, so that the failure time is reduced, the product quality is improved, and good benefit is obtained.

The invention relates to a vertical continuous annealing furnace interior reverse belt penetrating control method. The control method comprises the following steps that S1, a unit is stopped, and an annealing furnace is switched to the cooling mode; S2, the belt breaking position in the furnace is determined, whether the looping quantity of an outlet loop is enough or not is determined, and whether a reverse belt penetrating operation method is adopted or not is decided; S3, when the temperature of the furnace is decreased to the furnace cover opening temperature or below, according to the belt breaking condition in the furnace, a corresponding furnace cover is opened, steel scrap processing and rope penetrating operation are conducted, and a belt head is manufactured at the tail of a broken belt and connected with a belt penetrating rope; S4, a furnace roller needing to be subjected to linkage is selected; S5, according to the looping quantity of the outlet loop, the tension of the outlet loop is set, and belt steel in the furnace is tightened by adopting an outlet tensioning roller of the annealing furnace; S6, the outlet tensioning roller and the furnace roller are operated forreverse full linkage, and in-furnace reverse belt penetrating operation is conducted till the tail of the belt penetrates to an inlet tensioning roller of the annealing furnace; S7, all the furnace covers are closed, and the blow sweeping mode of the annealing furnace is started; and S8, the unit is started for normal production.

The invention provides a movable sleeve control method for pipeline steel, and belongs to the field of steel rolling. The method includes the steps that firstly, control parameters of movable sleeves between every two adjacent machine frames are determined through a first-stage computer and a second-stage computer according to the following formulas, wherein the target temperature of a strip steel finish rolling outlet is smaller than or equal to 810 DEG C, and the thickness of a finished product is larger than or equal to 8 mm; secondly, a table model of movable sleeve steel type tension coefficients is set up through the second-stage computer according to the requirements for process data and steel types, and steel type tension coefficients of different movable sleeves are obtained by looking up a table and sent out through the second-stage computer during rolling. By means of the movable sleeve control method, the hydraulic movable sleeves between the hot continuous rolling finish rolling machine frames are automatically controlled when the pipeline steel is rolled, the problem that the hydraulic movable sleeves between the hot continuous rolling finish rolling machine frames vibrate is solved when the pipeline steel is rolled, and abnormal shutdown time is shortened.

The invention discloses a steering roller control method for guaranteeing steering stability of strip steels on a treatment line. The method comprises the following steps: (1) a PLC receives the yield strengths and the thickness parameters of the strip steels operating on the treatment line; (2) the steering roller moment control parameters Qn of the PLC are set according to the parameters; (3) when the strip steels operate on the treatment line with constant speed, steering roller moment controllers are controlled through setting the adjusting coefficients A as the minimum value; when the strip steels operate with decreased speed or increased speed, the adjusting coefficients A of all the steering roller moment controllers are increased; and when the accelerations of the strip steels operating with decreased or increased speed are beyond the acceleration change dead area range, the adjusting coefficients A of all the steering roller moment controllers are set as the maximum value. The method can guarantee the steering stability of steering rollers and prevent the influence of the steering oscillation on the product quality, and can be widely applied to the technical field of strip steel production.

A speed control method for a loop virtual sleeving rack of a hot continuous rolling thin-steel-plate rolling mill is characterized in that when a rack loop torque deviation value is larger than or equal to 2000 Nm, the final speed reference value of the rack is correspondingly reduced; and when the rack loop actual torque is larger than or equal to set torque 1000 Nm (that is the torque when the rack loop torque deviation value is smaller than or equal to -1000 Nm), an integral control formula is applied to enable the torque to quit out of the above speed additional value. According to the method, off tracking, rolling rejects and major risks to mechanical equipment due to loop virtual sleeving are eliminated, the failure time is shortened, the product quality is improved, and good benefits are achieved.