Cylinder Liner Centrifugal Casting Machine

Two-station Fully Automatic CentrifugalCasting Machine
TechnicalScheme
Brief IntroductionDouble work position centrifugal cylinder casting machine is composed of two main engines, a set of mobile auxiliary machine working platform, a set of automatic pouring device, casting tubes conveying device, and electric control system, etc. The two main engines work coordinately with auxiliary machines, while the pouring system performing automatic pouring work to the two main engines on a time division basis.
The main engines is in horizontal supporting wheel structure, and its speed is frequency conversion regulating. Theauxiliary machines are compactly arranged on one mobile platform. The mobile platform movingand spraying vehicle both adoptservo driving method. The whole machine has the characteristics of compact structure, smooth movement, and high degree of automation.
The control system adopts PLC control system to control the actions of mainmachines and auxiliary machines, and the speed regulating process of the supporting wheels of the main machines. The variablespeed regulating system is composed of AC frequency conversion motor and AC frequency conversion speed regulator. By adopting imported AC frequency converter, the system has a characteristic of low speed and high torque, and being smooth in speed control and wide in the speedrange. The touch screen can monitor the working condition of the centrifugal casting machine and display the pouring process parameters, as well as the fault alarm information of the machine. The control system has twoworking methods, manual and automatic methods.Technical parametersItemValuesUnitCasting 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 motor7.5KwPulling car power2.2KwCleaning car power0.37KwPraying car power0.4KwMobile platform power1.0KwPouring car power1.0KwPouring ladle power0.4KwPouring ladle turning power0.75KwPulling stroke≥2200mm

The composition and features of the machine
The equipment is composed of centrifugal main casting machine (including a large base, bearing housing, supporting wheels, bearing, main motor and its base), mobile platforms (including spray coating, cleaning, tubes drawing, mobile trolley), automatic pouring device, electric control system, cooling system, casting tubes conveying device, etc.1. 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.
3.Excellent spray coating quality
The inner coating of the tube molds can reduce the impact of metal liquid on the tube molds and reduce the peak temperature of the tube molds, which can effectively prolong the service life of the tube molds, increase the friction force between the tube molds and liquid metal, shorten the time of the pour-in metal liquid to achieve the tube rotation speed, and also facilitate the casting pieces to release from the molds in tube drawing process.
The spray rod movement adopts servo control, which can stabilize the rod moving and make the rod positions adjustable, thus ensuring the uniformity of the coatings. The moving speed of the spraying rod can be divided into three adjustable phases, each of which can be adjusted in moving distance and moving speed to cooperate with the rotation speed of the tube molds and the spraying pressure to meet the requirements of a variety of complex spraying processes.
4. The real-time monitoring of the temperature of the tube molds and the spray water cooling
The mold temperature has a very big influence on the quality of the cylinder liner, in particular, on the metallographic structure and the hardness of the cylinder liner. If the mold temperature is too high, the wet paint shall inflames, which can cause uneven coatings, and the surface quality of the cylinder liner can't be guaranteed, and the service life of the molds shall be shortened; If the mold temperature is too low, the pouring paint can't dry out completely, the bubbles are not easy to dissolve out completely before the casting process; when the molten iron of high temperature meets the wet paint, the casting defects such as the white casts and air pores are likely to occur to the cylinder liner.The infrared temperature measuring device is configured to detect the real-time temperature of the three sections of the outer surface of the tubes molds, and which can display the temperature of the three sections at the man-machine interface. The cooling nozzles are evenly arranged in the axial direction above the tube molds, which can spray the cooling water to the outer wall of the tube molds as per the parameters of cooling time set-up so that the tube mold temperature can be controlled in the appropriate technology range.
5. Accurate and reliable tube drawing mechanism
The mechanism adopts the control method of pneumatic servo system, which can pull out the castings of cylinder liner smoothly from the tube molds. The position and speed of the tube drawing can be set up and adjusted.
6. Automatic pouring and accurate weighing of molten iron
Automatic pouring device is composed of pouring vehicle, pouring ladle, etc. Pouring vehicle can serve two host machines for pouring on a time division basis. Inclining and pouring speed of the ladle can be adjusted. The automatic weighing device for the molten iron is equipped with the pouring ladle to ensure the consistency of the weight for each batch of cylinders. The weight of the molten iron in the ladle can be displayed on the big screen and the records can be printed.
7. High efficiency, safe, stable, and flexible automatic control electrical system
Control system use PLC as the control core and use the man-machine interface as the monitoring system to achieve whole process automatic control of centrifugal casting machine and production process monitoring. Control system has the perfect protective measures, such as over-current protection, over-load protection, etc. The process parameters of the host machine and the parameters of the auxiliary machine, such as work positions and velocity, can be adjusted and stored in the man-machine interface, which enables the equipment to have certain flexibility and meet the production process requirement of a variety of cylinder liner castings in a certain range.