A method and system for controlling the unwinding of finished coils using double-high wire rods.

Abstract

This invention discloses a double-high wire rod unloading control method for matching finished coils, relating to the steel production field, and solves the technical problem of frequent coil dropping during existing double-high wire rod unloading methods. The method is as follows: The real-time position of the unloading trolley is acquired; the speed of the unloading trolley is controlled based on its real-time position; when a signal indicating steel is present on the hoist hook is detected, the unloading trolley is raised to a high position and enters the unloading position; when the unloading trolley is about to reach the unloading position, the stopping position of the coil is controlled by changing the distance of the unloading trolley; when the unloading trolley reaches the unloading position, the unloading operation is performed; after unloading is completed, the unloading trolley is lowered to a low position. This invention also discloses a double-high wire rod unloading control system for matching finished coils. This invention can improve the accuracy of coil positioning.

Description

Technical Field

[0001] This invention relates to the field of steel production, and more specifically, to a method and system for controlling the unloading of finished coils using a double-high wire rod. Background Technology

[0002] The unloading of coils in a double high-speed wire rod mill is the final process in high-speed wire rod production. The normal operation of this equipment directly impacts upstream processes; failure to unload coils in a timely manner can lead to the shutdown of the next-level mill. Frequent collisions and derailments occur with the unloading trolley due to excessive speed during coil unloading, causing it to collide with the positioning buffer and resulting in frequent derailments. This severely impacts production and is difficult to resolve. Furthermore, operators are prone to fatigue due to prolonged operation, leading to frequent operational accidents. For example, failing to press the stop button when the trolley returns to its original position results in severe wear on the track and wheels, or unloading coils before the trolley has fully ascended, causing coil drops. Therefore, the existing technology has significant defects and drawbacks, failing to properly match the normal rolling process, leading to frequent malfunctions in the unloading stage and ultimately coil drops. This results in production interruptions, accident delays, and a serious impact on product quality. The various defects of existing technologies can lead to various malfunctions and control deficiencies in actual production processes. Correspondingly, this results in equipment damage and waste of spare parts costs. These are inconsistent with lean production and improving equipment availability. Therefore, existing technologies cannot match the production process control policy of high quality and low cost. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a double-high-speed unwinding control method and system for matching finished coils, which addresses the shortcomings of the existing technology and solves the technical problem that frequent coil drops occur during the existing double-high-speed unwinding process.

[0004] The present invention discloses a double-high-line unwinding control method for matching finished coils, the method being as follows:

[0005] Obtain the real-time position of the unloading trolley;

[0006] The speed of the unloading trolley is controlled by the real-time position of the unloading trolley.

[0007] When a signal indicating that the hook of the hoist has reached the position and there is steel is detected, the unloading trolley is raised to a high position and enters the unloading position.

[0008] When the unloading trolley is detected to be about to reach the unloading position, the position of the coil stop is controlled by changing the distance of the unloading trolley; when the unloading trolley is detected to reach the unloading position, the unloading operation is performed; after the unloading is completed, the unloading trolley is lowered to the low position.

[0009] As a further improvement, the position on the unloading trolley is obtained by a photoelectric detection sensor.

[0010] Furthermore, the method for controlling the speed of the unloading trolley is to change the input current to the unloading trolley via an electro-proportional valve.

[0011] Furthermore, the method for changing the running distance of the unloading trolley is to set a time delay relay. When the unloading trolley is detected to have reached the unloading position, the input current of the electro-proportional valve is de-energized and delayed by setting a time delay time on the time delay relay.

[0012] Furthermore, the method for controlling the speed of the unloading trolley by its real-time position is as follows:

[0013] The method for controlling the speed of the unloading trolley by its real-time position is as follows:

[0014] The starting position of the unloading trolley from the low position and the stopping position of the unloading trolley when it moves to the high position are obtained. The difference between the stopping position of the high position and the starting position of the low position of the unloading trolley is used to obtain the movement distance of the unloading trolley. The movement distance is divided into n distance intervals.

[0015] Adjust the input current of the electro-proportional valve to the first set value I. max At each next distance interval, the current input to the unwinding trolley via the electro-proportional valve is successively reduced. When approaching the stop position, the input current of the electro-proportional valve is adjusted to zero, so that the speed of the unwinding trolley at the stop position is zero.

[0016] Furthermore, the expression for the input current in the k-th distance interval is:

[0017] I k =(nk)×(I max / n);

[0018] I k Let I be the input current for the k-th distance interval, and n be the total number of distance intervals. max This is the first set value.

[0019] Furthermore, a target position is set, and the unloading trolley is limited in front of the target position and is prohibited from descending during its forward movement.

[0020] A dual-high-speed unwinding control system for matching finished coils, comprising,

[0021] The unloading trolley position detection and control module is used to obtain the real-time position of the unloading trolley;

[0022] The high-speed unloading precision quantification speed control module is used to control the speed of the unloading trolley based on its real-time position.

[0023] The finished coil arrival delay control module is used to control the stopping position of the coil by changing the distance of the unloading trolley when it is detected that the unloading trolley is about to arrive at the unloading position.

[0024] The automatic unloading mode step sequence connection control module is used to perform unloading operation when the unloading trolley is detected to have reached the unloading position; after unloading is completed, the unloading trolley is lowered to the low position.

[0025] Beneficial effects

[0026] The advantages of this invention are:

[0027] 1. This invention improves the positioning accuracy of the coil by using an electric proportional valve to control the speed of the unloading trolley.

[0028] 2. This invention controls the stopping position of the coil by changing the running distance of the unloading trolley when the coil is detected, thereby optimizing the position and distance space.

[0029] 3. The present invention can prevent accidents that damage the towing chain by limiting the unloading trolley in front of position four and setting the unloading trolley to be prohibited from descending during its forward movement. Detailed Implementation

[0030] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0031] The present invention provides a double-high-line unwinding control method for matching finished coils, the method being as follows:

[0032] Obtain the real-time position of the unloading trolley.

[0033] The method for obtaining the real-time position of the unloading trolley is based on detecting the time and position signals of the finished coils on the trolley. The time and position signals of the finished coils on the unloading trolley are acquired using a through-beam photoelectric sensor.

[0034] The photoelectric switch of the through-beam photoelectric detection sensor is installed in a position that meets the on-site signal detection requirements and does not affect the normal unloading of the crane, thus realizing precise quantitative control of the unloading rhythm.

[0035] By controlling the speed of the unloading trolley based on its real-time position, the accuracy of coil positioning can be improved. The method for controlling the speed of the unloading trolley based on its real-time position is as follows:

[0036] The starting position of the unloading trolley from the low position and the stopping position of the unloading trolley when it moves to the high position are obtained. The difference between the stopping position of the high position and the starting position of the low position of the unloading trolley is used to obtain the movement distance of the unloading trolley. The movement distance is divided into n distance intervals.

[0037] Adjust the input current of the electro-proportional valve to the first set value I. max At each next distance interval, the current input to the unwinding trolley via the electro-proportional valve is successively reduced. When approaching the stop position, the input current of the electro-proportional valve is adjusted to zero, so that the speed of the unwinding trolley at the stop position is zero.

[0038] Furthermore, the expression for the input current in the k-th distance interval is:

[0039] I k =(nk)×(I max / n);

[0040] I k Let I be the input current for the k-th distance interval, and n be the total number of distance intervals. max This is the first set value. This allows for better control of the trolley's speed, thereby improving production efficiency.

[0041] When the first set value I max When the current is 10A, the motion distance is divided into 5 distance intervals. The first distance interval controls the input current to be 8A, the second distance interval controls the input current to be 6A, the third distance interval controls the input current to be 4A, the fourth distance interval controls the input current to be 2A, and the fifth distance interval controls the input current to be 0A. In this way, the speed is gradually reduced to allow it to gradually buffer and prevent it from falling off the winding.

[0042] The speed of the unwinding trolley is controlled by changing the input current to the unwinding trolley through an electro-proportional valve.

[0043] High-speed wire rod unloading refers to the final process of unloading finished products from the high-speed wire rod production line, along with related control equipment. This process and control equipment are crucial, directly impacting the overall production rhythm and finished product quality control. Electro-proportional valve control refers to controlling the speed and precision of the entire unloading system by manipulating electro-proportional valves. The speed of the unloading trolley refers to its forward and backward movement. The accuracy of coil positioning refers to the actual rate of achieving the desired position.

[0044] When the unloading trolley is detected to be about to reach the unloading position, the position of the coil stop is controlled by changing the distance of the unloading trolley; when the unloading trolley is detected to reach the unloading position, the unloading operation is performed; after the unloading is completed, the unloading trolley is lowered to the low position.

[0045] The method to change the travel distance of the unloading trolley is to set a time-delay relay. When the unloading trolley is detected to have reached the unloading position, the output current of the electro-proportional valve is de-energized for a delay by setting a delay time on the time-delay relay. This achieves better control of the unloading trolley.

[0046] Finished coil arrival delay control refers to time interval matching control designed based on the time signal and position signal of the finished coil arrival. By setting the delay, the position and distance space can be optimized.

[0047] When a signal indicating that the hook of the hoist has reached the correct position and there is steel is detected, the unloading trolley is raised to the high position and enters the unloading position. When the unloading trolley reaches the unloading position, the unloading operation is performed; after unloading is completed, the unloading trolley is lowered to the low position.

[0048] Set the target position as position four on the double-height line. Limit the unloading trolley in front of position four and prevent it from descending during forward movement. This will help prevent damage to the cable chain.

[0049] The no-load torque abnormality early warning and threshold intelligent adjustment are designed to first design an abnormal no-load torque abnormality early warning after the transmission mill throws steel in the case of equipment abnormality and abnormal working conditions. Timely warning can avoid the lag of related interlocking actions and the stop of the connecting drive, thereby avoiding steel piling and process accidents.

[0050] Intelligent correction of rolling distance threshold refers to the speed fluctuations caused by abnormal equipment status and process factors during the rolling process, which in turn lead to significant fluctuations in rolling distance monitoring data. The system achieves intelligent correction of the rolling distance threshold when the no-load torque is abnormal after the mill throws steel, by precisely optimizing and adjusting the time of the rolling distance threshold under abnormal conditions and by precisely quantifying and optimizing the quantity. Output-type steel signal end delay refers to the time interval import design based on the end of the steel signal output, which can optimize the time interval.

[0051] A dual-high-speed unloading control system for matching finished coils, employing the control method described above, detects the position of the unloading trolley and controls its start and stop. It includes...

[0052] The unloading trolley position detection and control module is used to obtain the real-time position of the unloading trolley;

[0053] The high-speed unloading precision quantitative control module is used to control the speed of the unloading trolley by the real-time position of the unloading trolley.

[0054] The finished coil arrival delay control module is used to control the stopping position of the coil by changing the distance of the unloading trolley when it is detected that the unloading trolley is about to arrive at the unloading position.

[0055] The automatic unloading mode step sequence connection control module is used to perform unloading operation when the unloading trolley is detected to have arrived at the unloading position; after unloading is completed, the unloading trolley is lowered to the low position.

[0056] This system improves the accuracy of coil positioning, controls the stopping position of the coil, optimizes position and distance space, and can prevent accidents that damage the tractor chain.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for controlling the unwinding of finished coils using a double-high-speed wire rod, characterized in that, The method is as follows: Obtain the real-time position of the unloading trolley; The speed of the unloading trolley is controlled by the real-time position of the unloading trolley. When a signal indicating that the hook of the hoist has reached the position and there is steel is detected, the unloading trolley is raised to a high position and enters the unloading position; When it is detected that the unloading trolley is about to reach the unloading position, the position of the coil stop is controlled by changing the movement distance of the unloading trolley; when it is detected that the unloading trolley has reached the unloading position, the unloading operation is performed. After unloading is complete, lower the unloading trolley to its lowest position; The method for controlling the speed of the unloading trolley is to change the input current to the unloading trolley through an electro-proportional valve; The method for controlling the speed of the unloading trolley by its real-time position is as follows: The starting position of the unloading trolley from the low position and the stopping position of the unloading trolley when it moves to the high position are obtained. The difference between the stopping position of the high position and the starting position of the low position of the unloading trolley is used to obtain the movement distance of the unloading trolley. The movement distance is divided into n distance intervals. Adjust the input current of the electro-proportional valve to the first set value I. max At each next distance interval, the current input to the unwinding trolley via the electro-proportional valve is successively reduced. When approaching the stop position, the input current of the electro-proportional valve is adjusted to zero, so that the speed of the unwinding trolley when it reaches the stop position is zero. The expression for the input current in the k-th distance interval is: I k =(n-k)×(I max / n); I k Let I be the input current for the k-th distance interval, and n be the total number of distance intervals. max This is the first set value.

2. The double-high-speed unwinding control method for matching finished coils according to claim 1, characterized in that, The position on the unloading trolley is obtained by a through-beam photoelectric sensor.

3. The double-high-line unwinding control method for matching finished coils according to claim 1, characterized in that, The method for changing the movement distance of the unloading trolley is to set a time delay relay. When the unloading trolley is detected to have reached the unloading position, the input current of the electro-proportional valve is de-energized and delayed by setting a time delay time on the time delay relay.

4. The double-high-speed unwinding control method for matching finished coils according to claim 1, characterized in that, Set a target position, limit the unloading trolley in front of the target position, and prohibit the unloading trolley from descending during its forward movement.

5. A system for controlling the unwinding of matched finished coils using the double-high-speed wire unwinding method according to any one of claims 1-4, characterized in that, It includes, The unloading trolley position detection and control module is used to obtain the real-time position of the unloading trolley; The high-speed unloading precision quantification speed control module is used to control the speed of the unloading trolley based on the real-time position of the unloading trolley. The finished coil arrival delay control module is used to control the stopping position of the coil by changing the movement distance of the unloading trolley when it is detected that the unloading trolley is about to arrive at the unloading position. The automatic unloading mode step sequence connection control module is used to perform unloading operation when the unloading trolley is detected to have arrived at the unloading position; After unloading is complete, the unloading trolley is lowered to its lowest position.