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Method for accelerating stabilizing speed of ultra-fast cold variable frequency pump water pressure system

A technology of water pressure system and stable speed, applied in the metallurgical field, can solve the problems of water system response lag, restricting economic benefits, affecting production rhythm, etc., to shorten the adjustment time, save power resources, and facilitate future maintenance.

Active Publication Date: 2013-04-03
NORTHEASTERN UNIV LIAONING
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  • Description
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Problems solved by technology

[0003] In the field of hot rolling production, the application of ultra-fast cooling tends to be widespread. However, because online production requires a high-speed, high-precision control system to ensure production efficiency, and the current water system has a problem of response lag, it is affected by the outside world. Under normal circumstances, the adjustment time is long, which seriously affects the production rhythm and restricts the economic benefits

Method used

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  • Method for accelerating stabilizing speed of ultra-fast cold variable frequency pump water pressure system
  • Method for accelerating stabilizing speed of ultra-fast cold variable frequency pump water pressure system
  • Method for accelerating stabilizing speed of ultra-fast cold variable frequency pump water pressure system

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Effect test

Embodiment 1

[0027] Take the external interference of the maximum water flow change of ultra-fast cooling is small, and the closed-loop control system is used alone as an example. Step 1: Modify the proportional-integral-derivative (PID) parameters of the hydraulic closed-loop system through the program.

[0028] Step 2: Adjust the PID parameters to a water pressure of 0.5MPa±0.02MPa where the response curve reaches a stable dead zone in the first water pressure oscillation cycle; due to the lagging characteristics of the water system response, the PID parameter debugging goal of step 1 is not optimal Response curves of engineering parameters, but after the first entry of water pressure.

[0029] Step 3: Calculate the final stable inverter frequency of the pumping station under different flow rates. Through repeated tests, manually count the relationship between the ultra-fast cooling set flow rate and the water supply pump frequency, and write the statistical data as shown in Table 1. In ...

Embodiment 2

[0032]Taking the external interference of the maximum water flow change of ultra-fast cooling as an example, using the open-loop first and then closed-loop control system as an example, the stable dead zone is water pressure 0.5MPa±0.02MPa, using the best engineering PID parameters, the response curve is in the second oscillation The cycle is stable, the proportional parameter P is 1.4, the integral parameter is 10s, and the water pressure stabilization time is 54s; and the optimized PID parameter, the response curve is stable in the first oscillation cycle, the proportional parameter P is 1.05 integral parameter is 16.5s, and the water pressure stabilization time is 25s.

[0033] Table 1

[0034] Ultra-fast cold flow Variable frequency pump frequency 1508 40.93 1808 41.00 2467 41.46 2536 41.58 2536 41.81 2647 41.91 2700 41.98 2850 42.35 3376 43.63 3590 44.29 3794 44.98 3996 45.13 4100 45.65 4480 ...

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Abstract

The invention provides a method for accelerating stabilizing speed of an ultra-fast cold variable frequency pump water pressure system. The method comprises an ultra-fast cooling device and a rolling production line of conventional layer flow cooling equipment and is characterized by comprising the following steps of: revising PID (Proportion Integration Differentiation) closed-loop control parameters to assure that an adjustment response curve reaches a water pressure allowed control range within a first water pressure oscillation period so that single closed-loop control can be realized; meanwhile, first giving the frequency of a frequency converter by using open-loop control according to an actual statistic flow-frequency curve, accelerating the response speed of the frequency converter and then automatically switching the frequency converter to closed-loop control so as to assure the control precision. According to the invention, the cooling water circulating cost is saved and thelater maintenance is more convenient; the single closed-loop control mode and the mode of first adopting open-loop control and then adopting closed-loop control can be selected according to the fieldsituation; the PID response curve of a closed-loop control system is more suitable for lag characteristic of the water system and shorter time is required for adjustment; and in the method of first adopting open-loop control and then adopting closed-loop control, the oscillation of the frequency converter during giving the frequency in a closed-loop way is reduced by first giving the frequency ofthe frequency converter in an open-loop way; and then the stable precision of the system is assured by using closed-loop control.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for accelerating the stabilization speed of a hydraulic system of an ultra-fast cold frequency conversion pump. Background technique [0002] Ultra Fast Cooling (UFC for short), as a controlled cooling device with strong cooling capacity, has significant advantages in the production of high-strength Nb-containing steel by controlled rolling and controlled cooling, which can reduce the use of Nb elements and make The above-mentioned problems that arise during the rolling of Nb-containing steel are easily solved. The new generation of TMCP (Thermo Mechanical Control Process) technology with ultra-fast cooling technology as the core can maximize the contribution of Nb elements to strength and toughness, and is one of the most effective ways to produce low-cost high-strength steel. [0003] In the field of hot rolling production, the application of ultra-fast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D7/06
Inventor 李勇王昭东田勇王丙兴袁国王国栋韩毅胡啸
Owner NORTHEASTERN UNIV LIAONING
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