Centrifugal Casting Machine for Pipe Production Line

Two-station fully Automatic Centrifugal Casting Machine for cylinder linersTwo-station fully automatic centrifugal casting machine is composed of the two engines and a auxiliary engine. The two engines which are controlled by VFD are parallel layout. The two engines share auxiliary engine and pouring equipment. Auxiliary engine is controlled by servo and it includes cleaning, spraying, pouring, cooling, casting extraction devices .The whole process are controlled automatically.
The main engine's speed is adjustable and steady in the high speed.The Spraying process is very advanced of multistage velocity control. The key process parameters are real-time monitor and adjusted by automatic control system. So it can ensure the casting process parameters repetition andconsistency. It eliminates the influence of artificial factors to the casting process parameters. So it ensures stable quality of the casings.
Mainengines1.1 The mainengineshas double working positions, and the two main engines are installed in the large base of welding structure. The large base is mounted on the embedded parts by welding or by screws mounting. Each main engine consists of four supporting wheels, divided into two pairs, respectively assembled into the driving shaft and driven shaft, which are mounted on the large base through the base plate (detachable) of the bearing seat (interchangeable in bearing maintenance). In pouring process, the tube molds are put between the two pairs of supporting wheels, a face angle of 95 - 115 degrees can be formed between supporting wheel center and the rotation center of the tube molds. When starting the equipment, the belt pulley of the motor drives the belt pulley of the main shaft (mounted on the pouring end surface of the main shaft) to rotate through the driving mechanism, and then the torque is transmitted through the friction force existing between the supporting wheels and tube molds, which in turn drive the high-speed rotation of the tube molds, and the pouring work can be processed.
1.2 Main enginesare equipped with the overall protective shield. The shield is nice in appearance, with one wholeguard covering the motor and its belt.
2. Mobile working platform of the auxiliary machine
The auxiliary machines are compactly mounted on one mobile platform, consisting of the cleaning device, tube drawing device, spraying device, and trolleys, etc. They are used to complete taskssuch as cleaning, spraying and tube drawing of the two main machines.
2.1 Spray coating device:
2.1.1 The spray coating trolley is driven by a servo motor through rackand pinion mechanism. The advancing speed is 200 ~ 300mm/s, and the reversing speed is 50 ~ 200mm/s during spray coating work.
2.1.2 The spraying speed and distance within a single journey can be divided into fouradjustable sections.
2.1.3 The air supply line is equipped with airpressure stabilizing tank, which can supply the spray pressure. The air pressure stabilizing tank is installed on the mobile platform;
2.2 Cleaning device: The cleaning trolley is driven by the ordinary motor through the rack and pinion mechanism to perform cleaning work by the cleaning brush within the scope of product specification. By taking advantage ofthe reciprocating movement of the cleaning rod, the purpose of cleaning the tube molds can be realized. The cleaningbrush can be replaced within the workpiece specification. The speed range of the cleaning trolley is 100 ~ 220mm/s.
2.3 Tubedrawing device: draw bench is a chain drive device with guiding spacing mechanisms at its upand down, left and right sides. Main actions are as follow: driven by motor, the draw bench goes to delivery position rapidly(100~220mm/s); hydraulic separator, propped open by tensioning cylinder, clinches casting inner wall, then draw bench pulls casting slowly to make it loose and pulls it out.
2.4 Translation platform: the platform, driven by reducing device and gear and rack of servo motor, isa gather of auxiliary engines of tube drawing, cleaning and spraying. Actions are accomplished bymovement of the platform. Precise position control technique provides stable and reliable switch between processes with only 1mm locating error. Crash bars, mounted onboth sides of the platform, can shut down the platform immediately and alarm by touching them. Press alarm reset button to make the platform back to work.
3. Automatic casting device
Automatic casting device, mounted at casting end of centrifugal casting machine, is composed of casting bag, automaticweighing device, tilting device, casting groove and mobile vehicle.
3.1 Transverse movements of casting vehicle are driven by AC servo motor, speed adjustable within the scope of 0-600mm/s. Stable and reliable position controlsystem, precisely locating.
3.2 Crash bars, installed on both sides of the vehicle, can shut down casting vehicle immediately and alarm by touching them. Press alarm reset button to make the vehicle back to work.
3.3 Longitudinalmovements of casting vehicle are driven by AC servo motor, speed adjustable within the scope of 0-300mm/s. Stable and reliable position controlsystem, position adjustable separately.
3.4 Tiltingof casting bag is driven by an AC frequency conversion motor. Tilting speed adjustable. Tilting position could be kept (duration adjustable) when it's in place and will return after liquid iron pour-out.
3.5 Casting vehicle is equipped with automatic weighing device (accuracy:100g, response time<0.2sec.). Weight of molten iron is displayed on screen.
3.6 Castingprocess: Weight of liquid iron in the castingbag is detected by automaticweighing device and displayed on screen. Filling stops after reaching setting weight. Casting vehicle moves transversely to axis of main engine; casting device move forward to cast position; casting bag tilts and pours liquid iron into pipe mould through casting groove; after casting complete, vehicle move backward and then transversely to position waiting for next centrifugal casting.
4. Mould cooling and temperature measurement devices for main engine
4.1 Every engine is fitted withseparate cooling channel which could cool down mould, solenoid valve and manual flow control valve evenly.
4.2 Every main engine is equipped withthree infrared thermometers measuring temperatures of head, middle and tail sections respectively. Protective devices are installed onthe thermometer. 5. Electric control system
Electric control system is mainly composed of frequency conversion, servo driver, PLC, touch screen, control cabinet, LV electric component, buttons, indicator lights etc.
5.1 The PLC is adopted as lower controlling computer and the 10.4 inch color touch screen is used as the upper monitoring computer in the control system, thus to achieve stepless revolution control of main machine, automatic cooling control, movement positioning and automatic speed control of auxiliary machine, working status and technological parameter (i.e. revolution, cooling time, etc.) monitoringof main machine, as well as position and speed parameter setup and modification of the auxiliarymachine. The parameters like speed and position during the wholeoperation of the machinecan be automatically programmed from the touch screen, thus to satisfy automatic production.
5.2 The technological parameters for no less than 20 kinds of castings are stored in touch screen and can be extractedconveniently.
5.3 The control system provides manual and automatic control modes that can be shifted toeach other as per requirements. The manual mode is used for machine adjustment, while the automaticmode is for normal operation.
5.4 Each main machine can be shifted to off-line/on-line status during operation.
5.5 The control system is furnished with perfect safety measures like interlock, over-heat and over-load protection, in order to ensure itssafety and uninterrupted production.
5.6 Electrical control boxes are equipped withair conditioners.
Main technical parametersnameofparameterparameter valuesunitCasting diameterΦ60~Φ120mmCasting maximum length1500mmMold raceway diameterΦ100~Φ180mmRiding wheel diameterΦ300x70mmTwo riding wheel outer span900mmThe distance between ground and mold center800mmThe hostspacing800mmSpeed of mold0~2000rpmCentrifugal machine power motor7.5kw