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Pakistan (All cities)
Overview The automatic control for the molten steel level of the mold is one of the key technologies of continuous casting production. It is very important to reduce the labor intensity of workers, improve production efficiency, improve the quality and output of casting billet, reduce overflow and breakout of steel and improve the management level of steelmaking and continuous casting. The molten steel is poured into the mold. In order to prevent overflow, the molten steel level must be kept stable. Otherwise, during the casting process, if the level will fluctuate too much, and slag will be involved, forming surface slag inclusion on the surface of the casting billet, affecting the quality of the billet. The test points out that the relationship between the level fluctuation and the depth of casting billet surface slag inclusion is as follows: The experience has shown that surface slag inclusions can be eliminated when the level fluctuation is within ±10mm. At the same time, if the level fluctuation is more than 10mm, the rate of longitudinal cracks on the casting billet surface is 30%. It means that the level fluctuation directly affects the surface quality of the casting billet. The principle of the system The eddy current type molten steel level gauge is the key to the system. The system operates reliably and has excellent performance: high temperature resistance, strong anti-interference ability, fast dynamic response (lag time 0.10s), high detection accuracy (±05mm), and large measurement range (0-150mm). The selected electromagnetic field frequency ensures that the level detection probe only detects the level change of the mold and does not detect the mold flux or steel slag layer. The system has the advantages of simple operation and no radiation protection problems. The system is insensitive to argon blowing, and its sensors can be mounted on the tundish car or on the platform. The sensor is cooled by compressed air during use. The principle is shown in the figure A high-frequency exciting winding is installed above the molten steel surface of the mold. The high-frequency magnetic field generated by the high-frequency exciting winding induces eddy currents on the molten steel surface to form a magnetic field. The magnetic field generated by the induced eddy current is in the opposite direction to the magnetic field generated by the high-frequency exciting winding, which changes the impedance of the high-frequency exciting winding. Under the condition that the winding material and structure, steel grade, temperature remain unchanged, the coil impedance change only has a single-value function relationship with the height of the molten steel level. As long as the impedance change of the high-frequency winding is detected, the change of the molten steel level in the mold can be converted. The components of the system Continuous casting mold level automatic control system is composed of eddy current tyoe molten steel level gauge, controller and digital actuator for adjusting the opening of tundish stopper. The detection end of the mold level automatic control system is ① eddy current displacement sensor, which uses the eddy current mutual inductance effect between the energized coil and the metal conductor to detect the distance. The effective signal of the eddy current sensor is amplified and linearized by the circuit of ② mold level gauge, which converts the 0-150mm change in the molten steel level of the mold into a standard signal of 4-20mA.DC, and then transmits it to the ③ control computer to complete data processing and system control functions. We can also control the actuator manually and automatically through the ④on-site operation display control panel, and the opening of the stopper is controlled by the ⑤ actuator to realize the automatic control of the molten steel level. 1 Eddy current sensor; 2 mold level gauge; 3 control computer; 4 On-site operation display control panel; 5 digital actuator; The control principle of the system The system can be set to four control modes: automatic, semi-automatic, manual and motor clutch. The automatic mode is the closed-loop control system of the molten steel level, and control the opening of the stopper by the digital actuator; the semi-automatic mode uses opening degree setter and digital actuator to set the opening of the stopper manually; the manual mode is to open and close the button directly to control the opening of the stopper; the motor clutch mode is quickly changed from any of the above control methods to manual stopper operation. The functions of the system also include: display and record of molten steel level, nozzle opening and casting speed; setting of molten steel level and nozzle opening; alarm of molten steel level at limit value etc. In addition to taking the detection of molten steel level as the main feedback signal of the control system, the control system also considers various interference factors that have an impact on the level control. These interference factors include: 1. The influence of the change of the flow characteristics on the control system after the melt loss of the stopper 2. The influence of the weight change of molten steel in the tundish on the control system 3. The influence of the change of the casting speed of the continuous casting machine on the control system 4. The influence of the mold width change (the mold width is adjustable) on the control system 5. The influence of the vibration frequency and amplitude of the mold on the molten steel level gauge The function and software implementation In order to overcome these disturbances, the mold level control strategy adopts PID control. And on the basis of PID control, self-adaptive correction and feedforward control are introduced to form an advanced control system. The level control is the main loop, and there is a proportional gain of the main loop controller. According to the self-adaptive correction of the mold width change and feedforward compensation of casting speed, so as to further reduce and eliminate liquid level fluctuations caused by mold width adjustment and casting speed changes. In order to reduce the frequent action of the stopper, the system adopts the intergarting time change of the controller, and automatically selects a longer intergarting time when the molten steel level fluctuates lightly. And the system will choose a shorter intergrating time when molten steel level fluctuates greatly. Thereby, the fluctuation of the controlled object caused by the frequent action of the stopper rod is suppressed. In the signal processing of molten steel level gauge, an appropriate filtering link is added and the vibration frequency synchronous filter is used for filtering processing, which can overcome the interference of mold vibration frequency and amplitude variation.
Rs 200.000,0
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Askoley (Northern Areas)
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Rs 250,0
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Pakistan
After a small size Male tri colour beagle smaller than standard size,ideally pocket size or small legged. Must be K.C Registered and come with papers.Ideally Adult or 8months and over.Cash waiting can travel.,
Rs 200,0
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Rawalpindi (Punjab)
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Rs 0,0
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Karachi (Sindh)
Mishkat service major market segments in the provinces of Sind and Punjab and our offerings range meets the needs of small and medium size industries, retail logistics. Visit https://www.mishkat.com.pk/
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Pakistan (All cities)
We are specialized in the sales of full metal scrap/ recycling material such as ac/fridge compressor , Ceramic Cpu Gold Processor Scraps , H.M.S 1&2, Copper wire scrap,Drained Battery Lead scrap in the UK (LONDON).We have all our product fully ready for sales in good quantity and quality also to be shipped out for our buyers.For Booking : https://wa.link/og0sgp Whatsapp: +15806151130
Rs 1.000,0
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Pakistan (All cities)
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Rs 30.650,0
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Abbottabad (Khyber Pakhtunkhwa)
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Rs 500,0
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Pakistan (All cities)
The composition of the system The photoelectric strip automatic center position control system is mainly composed of sensors, amplifiers, PLC controllers, hydraulic control and other parts. System composition block diagram The main technical parameters 1. Detection width: 300-2800mm 2. Detection light source: 220VAC. (100VAC) 30W. High frequency white light works continuously 3. Photodetector: precision die-casting components, time constant 20ms 4. Maximum working voltage: 50VDC 5. Distance from receiver to emitter: 300-1000mm 6. Operating temperature: 0℃-60℃ 7. Resolution: 0.5mm 8. Linearity: ±1%F.S (after linearization) 9. Repeatability error: △R1%, F.S 10. Servo-valve working signal: ±10V 11. Rated pressure (oil pressure): 4.5Mpa 12. Rated flow: 30L/min 13. Symmetry: 10%
Rs 0,0
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Pakistan (All cities)
ALUMINIUM USED BEVERAGE CANS SCRAP LOOSE BALED OF UK ORIGIN. Available quantity 500mt Minimum Order acceptable 25MT Will be loaded in a 40ft high cube container Weight per container will be approx 25 mt. Origin: United Kingdom Details Item Aluminium scrap UBC Attechment : 3% Purity: 97.9% Minimum Density : 14 Pounds Per Cubic ft (225 kg/m3) Smooth Surface Tight Tolerances aluminum scrap Easy control and operation Fast melting Discontinuous melting with scrap High efficiency Stable working structure Packaging & Delivery Packaging Detail: it comes in bales, or according to the customer demand. Delivery Detail : Within 21-25 working days after order confirmed A maximum of 3% of impurities to be considered.this is just an outer limited Specification: Aluminium UBC Beverage Cans Chemical Composition: Si: 0.2 – 0.6%, Fe: 0.35%, Cu: 0.1%, Mn: 0.1%, Mg: 0.45 – 0.9%, Cr: 0.1%, Zn: 0.1% Standard Conforming to: (C11000 (ETP) Content 99.90%) Origin: United Kingdom/ Europe Packing: In Bundles Quantity: 25MTS and up to 300 MT per month Shipment: 40FT Container for more details contact us via email at baicuscrapmetalltd@gmail.com or whatsapp +447918 245841
Rs 300,0
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Pakistan
We have 6 kittens that will be available as pets, they will be ready to leave home on 7 April 2016. There are 3 boys and 3 girls. Silver spotted and Brown spotted. Mum is a gorgeous Silver Marbled F6 and Dad is a stunning tarnish free Silver spotted boy. If you are interested in these babies, please contact me as there is always a great demand for these babies from this pairing. They always make fabulous big kittens and this is probably the last time that these two are paired together due to the age of Oliver. Viewings start at 8 weeks of age after their 1st vaccination when we will require a non-refundable deposit to secure your kitten. We can also early neuter your boys before they leave us, this will be chargeable, please ask us about this. Individual photos will be taken in a few weeks when kittens are weaning. Please note that some of the kittens are in the fuzzies so markings will not clear for a few weeks yet: Beige Collar - Cool Brown Boy Blue Collar - Silver Boy Green Collar - Silver Boy Purple Collar - Brown Girl Yellow Collar - Stunning Cool Brown Girl Pink Collar - Silver Girl
Rs 5.000,0
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Pakistan (All cities)
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Rs 0,0
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Pakistan (All cities)
This sheep leather baby bag features a dual zipper compartment, providing convenient organization. Inside, discover a zipper pocket alongside two open pockets for easy access to essentials. Additionally, two cosmetic handling loose fit pockets offer versatility. Stylish and practical, this bag ensures both functionality and chic appeal for on-the-go parents. Size: Height: 21.5 cm Length: 40.5 cm Width: 18.2 cm Strap: 64.8 cm
Rs 0,0
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Pakistan (All cities)
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Rs 0,0
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Karachi (Sindh)
M.S.K. INTERNATIONAL” is a big name in Pakistan, supplier for Air Conditioning, Refrigeration Controls & Parts, Hardware Tools, Building Materials, Wood Products, Pneumatic Tubes, & Fittings, Welding, Cutting & Safety Products, Complete M.S, G.I & S.S Products (Pipes, Fittings & Structural Materials), Ferrous & Non-Ferrous Metals, Industrial Valves and all kinds of Electrical Components, Cables, Distribution Box & Electrical Accessories and all kind of Fabrication Work.
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