What do you mean, four machines and one pump?

Four machines and one pump, water pump, fan, air compressor and crane, diesel engine.

Introduction of electro-hydraulic AGC system for 650mm four-stand continuous rolling mill

1.DC drive system 1. Configuration: Siemens 6RA70 controller is used for DC speed regulation (power components are made in Zheng Xi factory), and low-voltage electrical appliances are made by Sino-foreign joint venture Suzhou Siemens products. 2. Control system: The key of continuous rolling mill is to control the roll speed of stands and the tension between stands, that is, secondary flow control. The basic automatic PLC S7-300 system is configured to control the speed tension, lifting speed and winding diameter of the coiler. In addition to setting speed and tension according to the requirements of rolling process and receiving AGC system to adjust speed and tension through thickness difference signal (tensiometer is installed between stands). Each frame motor is equipped with a photoelectric encoder for speed feedback. 3. The capacity expansion of each DC motor, that is, the DC output current, is equipped with an overload factor of 1.4 times, and the thyristor is protected by a fast fuse. Each speed control cabinet is equipped with an incoming reactor (if the user suggests installing a harmonic absorber on the rectifier transformer side). The second is the AC auxiliary drive of the AC drive system control unit (including each hydraulic pump station). In addition to the start, stop and protection control of AC motor, each pumping station is also equipped with remote distributed I/O, and Siemens ET200 is used for communication control to reduce wiring interference and improve reliability. 3. Hydraulic screwdown and AGC system 1. Configuration: Siemens S7-400PLC is used as the electric control system, Balouf BTL5 digital sensor is used as the displacement sensor (its resolution accuracy is 1m), and the pressure sensor is a Sino-US joint venture product. The operating platform is equipped with Siemens OP270 touch screen, and the operator can set the input of rolling process parameters and collect the actual process parameters. 2. Function: The hydraulic pressing electronic control system of each frame is equipped with a positioning ring and a pressure ring. The first frame and the fourth frame cooperate with the thickness gauge to pre-control and monitor the AGC, and the speed priority AGC and tension priority AGC can be selected according to the process requirements in the system. The AGC of the first rack is to monitor the first rack, because the unit has no thickness gauge in front of the first rack, and the pressure of the first rack is adjusted by the thickness difference signal of the thickness gauge behind the first rack (thus sensing the tension change between racks and adjusting the tension between racks at the same time). (If the thickness gauge is also installed in front of the first stand, the monitoring AGC of the fourth stand can also be pre-controlled, that is, the front lock control), that is, the thickness difference signal of the thickness gauge at the exit of the fourth stand is used.

In general, the speed of the fourth stand and the tension adjustment of the coiler have a dead zone. When the tension changes beyond the dead zone, adjust the reduction of the fourth stand (in fact, the steel strip of the fourth stand is very thin, so adjusting the reduction position doesn't work, and automatically switch to rolling force control), but the tension between the stand and the coiler should be kept constant. (The thickness gauge adopts Tsinghua University 4 isotope thickness gauge). The hydraulic screwdown and AGC electric control of each stand have the following functions: 1) APC function of setting control, 2) AFwC function of rolling force control, 3) smooth switching function of APC and AFwC, 4) given roll gap inclination angle, 5) synchronous control function of oil cylinders on operating side and transmission side, 6) zero roll gap screwdown and quick positioning, slow gear setting and quick roll lifting function 7) fault diagnosis and alarm function 4. HMI man-machine dialogue and electronic control of PC unit are provided by industrial computer (PC) supported by WINCC software. Its main functions are: collecting rolling process parameters, selecting optimized rolling parameters for output and printing reports. V. Hydraulic system The hydraulic system includes: screw-down pump station, total liquid station (i.e. auxiliary transmission hydraulic station), hydraulic station for balancing the bending roller and intermediate roller of the fourth stand, dilute oil station and emulsion station. Press the high-pressure main pump of the pumping station, one for use and one for standby, the auxiliary pump (circulation and back pressure pump) for use and one for standby, and the main pump of the middle horizontal pumping station with balanced bending roller for use and one for standby. The electro-hydraulic servo valve of the screw-down system adopts 609 FF 102 or 106 servo valve, and the proportional servo valve is used for bending and traversing. Each pumping station is equipped with filters, accumulators, heaters, coolers, displacement sensors and oil temperature controllers, and the system is equipped with hydraulic control valves such as electromagnetic relief valves. The high-pressure pump adopts the products of Shanghai High-pressure Oil Pump Factory, the low-pressure vane pump adopts the products of Yuci Hydraulic Parts Factory, and other hydraulic components adopt the products of Beijing Huade (formerly Beijing Hydraulic Parts Factory). The oil tanks are all made of stainless steel.

I. Composition, use and characteristics of YYT28 full hydraulic rock drill

Full hydraulic rock drill consists of rock drill, hydraulic leg and hydraulic pump. Hydraulic pump can be divided into one pump, two pumps, four pumps and so on. , can be selected according to the construction requirements. Underground construction can be equipped with explosion-proof electric hydraulic pump or diesel hydraulic pump. Select the configuration as required; At present, it has been adopted by many departments such as public railway tunnels, hydropower and water conservancy projects, building materials quarrying and so on.

YYT28 leg hydraulic rock drill is matched with various hydraulic stations, which has the characteristics of fast drilling speed, low power consumption, light noise, few faults, safety and reliability, simple configuration and convenient movement. The drilling speed is faster than that of pneumatic drill, and the working efficiency is improved; The longest leg can reach two and a half meters long, and the shortest leg is one meter three;

2. What are the main parameters of 2.YYT28 full hydraulic rock drill?

Drilling depth: less than or equal to 6m.

Aperture: 32-46

Power consumption: 8 degrees/hour

Rod drill: 22× 108

Fuselage length: 600 mm

Machine weight: 28kg

Total weight: 300KG

Host: 0.6*0. 173*0. 19m

Working oil pressure: 15- 17Mpa.

Flow: 30-35L

Impact energy: 60-65J