34results about How to "Avoid broken belt accidents" patented technology

The invention discloses a 0.4 mm thin IF steel strip continuous annealing anti-wrinkling control method, including steps of: a) during normal operation of a steel strip annealing production unit, shutting off cooling fans of at least one group of slow cooling sections and quick cooling sections, and shutting off electric heaters in all aging sections; b) during emergency speed down of the steel strip annealing production unit, switching heating mode into standby mode; c) when the steel strip annealing production unit is shutdown in failure, reducing the temperature of all zones in the furnaceto lower than 550 DEG C and increasing technical speed to 75-85 m / min with maintenance, then heating the temperature of the internal zone of the furnace to 700 DEG C, and increasing the technical speed to 95-105 m / min with maintenance, and when the temperature of the internal zone of the furnace reaches technical design requirement, returning to normal production. By means of the method, cold-wrinkling during production of the 0.4 mm thin IF steel strip is prevented, and accident of breaking of the steel strip is avoided. The method guarantees normal and stable production of the unit and reaches the object of reducing cost and increasing efficiency in enterprises.

The invention provides a heating device and a heating method for edges of steel coils. The heating device comprises a water circulation system, a steam heating system, an electric control cabinet and a heating device, wherein the water circulation system comprises a hot water pump, a circulating water pipe, a check valve and a stop valve, the steam heating system is provided with an air inlet pipe, an electric gate valve, a transverse pipe and drain pipes, the electric control cabinet is provided with electrical elements and a PLC (programmable logic controller), and the heating device comprises connected water tanks with covers. The heating device and the heating method have the advantages that water is heated by steam, the steel coils are heated by hot water, the hot water is recycled, accordingly, water consumption can be greatly reduced, and the occupied area and the engineering investment are reduced; the heating efficiency is improved, steel coil heating time is greatly shortened, different heating temperatures can be adopted for the different steel coils, steel coil heating flexibility is improved, the rolling star temperature of the steel coils is assuredly kept higher than 50 DEG C under the condition that the heating time is shorter than 40 minutes, and requirements of rolling rhythm are met completely; and the quality of edges of rolled strip steel is effectively improved, the shortcoming of edge crack is overcome, and strip breakage accidents of the steel coils are stopped.

The invention discloses a method for stopping and reducing the tension of a large-scale continuous annealing furnace for strip steel. By controlling the order and direction of each furnace roller's final stop rotation, the steel strip in the furnace is in a sagging state. When the temperature of the annealing furnace returns to room temperature , the steel belt is not easy to be tensioned due to cold shrinkage or the tension degree can be reduced, which is beneficial to avoid the occurrence of broken belt accidents caused by parking.

The invention relates to a control system and a control method of a dancer roll, wherein the control system comprises a guide rail, a position sensor and a pneumatic control system; a movable frame used for bearing the dancer roll is arranged on the guide rail; the position sensor is used for detecting the stroke variation between a target position and an initial position of the dancer roll; the pneumatic control system is used for providing tensile force to shift the dancer roll to the target position; and the pneumatic control system at least comprises a pneumatic proportional valve. The control method comprises a step of controlling the tensile force of the dancer roll and a step of controlling the position of the dancer roll, wherein the step of controlling the tensile force comprises the following steps of: a, calculating a pressure set value of the dancer roll, and b, converting the pressure set value of the dancer roll into a pressure set value of the pneumatic proportional valve; and the step of controlling the position also comprises the following steps of: a, recognizing the position of the dancer roll, and b, converting the difference value between a position set value and an actual value of the dancer roll into a speed compensation value of a unit idler roller.

The invention discloses an anti-deflection start-up method of an annealing furnace. The anti-deflection start-up method of the annealing furnace comprises the following steps: acquiring the actual retention time of belt steel in the annealing furnace and then comparing the actual retention time with a preset time threshold value; and if the actual retention time is less than or equal to the presettime threshold value, performing start-up in the annealing furnace at once after unplanned shutdown. In order to avoid generation of "deflection" defect on the surface of the belt steel caused by thefact that the temperature difference of the belt steel and a furnace roller is increased when the temperature of the belt steel is reduced continuously, a furnace area adopts "rapid speed-up" operation at the moment until the speed of the belt steel is more than the minimum safe operation speed. If the actual retention time is more than the preset time threshold value, start-up can be conducted after the temperature is reduced, the furnace area adopts "stepped speed-up" until the belt steel which stays in a heat area in the furnace completely deviates from a heating section and a soaking section, "stepped speed-up" is to enable the temperature of the belt steel and the temperature of the furnace roller to tend to be consistent as much as possible, and occurrence of the belt breaking accident in the furnace caused by serious deflection during start-up of materials liable to deflect is avoided.

The invention discloses a pickling line tandem cold mill withdrawal and straightening machine control method. When the yielding strength of a target steel grade is smaller than or equal to 300 MPa, the ductility of a withdrawal and straightening machine is 2.3%-2.5%, and the engagement amount is 30 mm to 35 mm; when 300 MPa<the yielding strength<=450 MPa, the ductility is 1.8%-2.2%, and the engagement amount is 35 mm to 40 mm; when the yielding strength is larger than 450MPa, the ductility is set 0.5%-1.2%, and the engagement amount is 40 mm to 42 mm; and meanwhile according to the difference of the thickness or the width of front strip steel and rear strip steel, weld joint excessive withdrawal and straightening machine modes are divided into four kinds. By means of the pickling line tandem cold mill withdrawal and straightening machine control method, the withdrawal and straightening machine achieves automatic grouping control over steel grades in different yielding strength levels, normal withdrawal and straightening of the withdrawal and straightening machine can be guaranteed, the loads of the withdrawal and straightening machine can also be effectively reduced, normal pickling of the strip steel is guaranteed, and the withdrawal and straightening up-to-standard rate reaches 98% or above; and selection of the weld joint excessive withdrawal and straightening machine modes guarantees normal pickling of weld joint heads and tails, and the strip breakage accident caused by poor weld joint quality is avoided.

The invention provides a steel belt butt-joint device and a butt-joint method thereof. The steel belt butt-joint device and butt-joint method thereof comprises at least two groups of end covers, a base and a countersunk bolt. Two through grooves are formed on the working faces formed by the end covers and the base, and two rectangular through holes are formed after opposite buckling. When steel belt butt joint is performed, a hand hammer is utilized to fix steel belts on a reinforced square steel rod, belt heads and belt tails are placed into the through holes, the countersunk bolt is fastened appropriately to exert tensile force on the belt heads and the belt tails respectively and then is fastened after tightening to exert tensioning force, and the belt heads and the belt tails are firmly clamped on inner walls of the through holes through the reinforced square steel rod. The height of the butt-joint device can be reduced, so that the butt-joint device can conveniently and smoothly pass through the sealing roller position and other narrow regions, and belt breakage accidents are avoided. The steel belts are formed through single-layer extrusion, so that the labor intensity is reduced, the operation time is shortened, and the operation efficiency is improved by more than 30%. Friction resistance is increased through external force, the locking effect is guaranteed, the steel belt connecting success rate and the unit operation rate are improved, and the production cost is reduced. The steel belt butt-joint device is simple in structure, convenient to operate and strong in applicability.

The invention discloses a method for acquiring process parameters of resistance seam welding and a welding method, and belongs to the field of welding. Among them, the method of obtaining the process parameters of resistance seam welding, the fastest welding speed is determined through the following steps: based on the finite element method, establish a temperature field / stress field calculation module for narrow lap resistance seam welding; Stress field calculation module, given welding current, electrode pressure and overlap amount, extract nugget size and plastic ring size; take nugget size and plastic ring size as constraints to solve the fastest welding speed. The invention obtains the nugget size and plastic ring size as constraint conditions through the narrow lap resistance seam welding temperature field / stress field calculation module, and can solve the fastest welding speed on the premise of ensuring welding quality and avoiding belt breakage accidents. The present invention does not need to pass multiple field tests, which is beneficial to saving time, manpower and material resources.

The invention provides a tension on-line detecting device which comprises a rack (1), cylinders (2), a connecting plate (3), pressure sensors (4), rollers (5), and a display screen (6). The upper right of the rack (1) is provided with the display screen (6) fixed through a base. The upper sides of the pressure sensors (4) are fixed to the lower side of the connecting plate (3), and the lower sides of the pressure sensors (4) are connected to the bases of the rollers. The tension on-line detecting device is characterized in that the lower side of the connecting plate (3) is provided with multiple groups of uniformly distributed pressure sensors (4) and rollers (5). According to the device, through the pressure sensors (4) arranged on the rollers (5), the tension of each section of a cold-rolled plate is detected, a worker can conveniently adjust the gap between rollers according to the tension of each section, and a belt breaking accident caused by uneven tension is avoided.

The invention discloses a soft-measuring method for the tension of band steel between rollers of a continuous annealing unit, comprising the following steps of: (1) acquiring process data; (2) preprocessing the process data; (3) constructing a soft-measuring model for combining a cascade observer with a neural network compensator; and (4) correcting the model. The moment current of a frequency converter corresponding to each roller between two tension measuring instruments, the speed and the boundary tension of each roller are used as the input quantity, the tension between every two rollers is calculated by the recursion in a cascade manner by adopting a frequency domain observer arithmetic, thus the indirect calculation and measuring on the tension of the band steel at the position where no tension measuring instrument is installed can be better realized, a favorable means is provided for the stability monitoring of the operation condition of the continuous annealing unit, high-precision calculation on the tension of the band steel at the position where no tension measuring instrument is installed is realized relatively accurately through compensating the nonlinear process characteristic and the unmodeled dynamics by applying a main model and neural network method, and a basis can be provided for the optimization on the control process parameter of tension in the continuous annealing unit.

A strip steel buckles forecast method suitable for a continuous withdrawal unit, mainly comprises the following steps that are executed by a computer: 1 collecting a key apparatus of the continuous withdrawal unit and a technological parameter; 2 collecting the strip steel parameter; 3 defining related parameters; 4 calculating a strip steel critical instability stress Sigmah-cr(x); 5 calculating a Poisson stress Sigmav(x) that is born in strip steel local instability area, a thermal stress SigmaT(x), a frictional force Taud(x), and a centripetal force Tauz(x); 6 calculating a transversal crushing stress Sigmah(x) that is born in strip steel local instability area; 7 calculating strip steel buckles index distribution Lambada(x); 8 determining if Lambada(x) <Lamada *satisfies; and 9 outputting the forecast result. Buckles forecast in strip steel plate-connecting process is realized, thereby reducing accident rate and raising production efficiency.

A method for controlling the edge cracking of strip steel through the roll shape of a crystallizing roll, comprising the steps of discretizing the edge roll shape curve of the original crystallizing roll, the thickness curve of the cast strip, and the thickness curve of the rolled strip, and calculating the center position of the strip steel width direction. Control the thickness reduction ratio of the strip edge area, and obtain the corrected crystallization roll edge roll shape value according to the roll shape optimization variables, etc., and perform curve fitting on the discretized roll shape value to obtain a new The crystallization roll edge roll shape curve. The invention controls the thickness of the edge part of the cast strip by changing the shape of the edge part of the crystallization roll, and controls the width direction of the strip steel during the hot rolling process, especially the thickness reduction ratio of the center region and the edge region, and improves the hot rolling process. The rolling balance in the width direction of the strip solves the defect of the edge crack of the double-roll cast strip, improves the quality of the strip edge, and solves the problems of broken strip and poor production continuity caused by the edge crack defect.

The invention discloses a stereoscopic vision on-line detection method for a surface crack of a stretched aluminum alloy plate. According to the vision detection method, two CCD (Charge Coupled Device) cameras are fixedly connected with equipment so as to keep the constant parameters of the relative position of the CCD cameras; a matched calibrating program is used for automatically finishing a calibrating operation for the parameters of the two cameras; and a special precise mechanical system is used for controlling and outputting focal length parameters of the cameras, so as to realize the precise measurement for space coordinate information of a small object. Accordingly, a real-time measuring algorithm for an area stress and a crack length on the basis of displacement of a surface texture feature point (detecting point) is provided. The measured stress level and crack length information are combined with a crack growth theory, so that the crack threatening estimation and the action forecasting are realized, the optimal stretching technical parameter is confirmed, the belt breaking accident is avoided during a stretching process, the safety of equipment and production personnel is ensured, the yield of products is increased and the application prospect in the panel processing field is wide.