Q43-2500

HYDRAULIC METAL CUTOFF MACHINE

MODEL  Q43-2500

 

本公司专业生产箱式剪切机、不锈钢打包机、重型打包剪切机、移动式打包机、打包剪切机、轮式抓钢机、打包机（金属打包机）、剪切机（金属剪切机）、屑并机、废纸打包机引领废钢回收设备新时代。

电话：15861655469陈先生

www.yeyadabao.com

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Electric system

Mains power source: AC 380V, 3 Phase, 50Hz

Consists of 2 circuits: control circuit for motor and that for motions.

An asynchronous motor Y-type, 380V 3 phase (model Y250L2-6, power 20KW, 960 rpm) to drive a high pressure axial piston pump. Its start and stop are by pushing buttons via a AC contactor. A fuse breaker is available for overload protection.

The control circuit for motions is switched to a 220V supply gained from a step down transformer. Buttons and proximity switches are used to operate cutting off, pressing and return. Control electricals are inside the power cabinet on the side of the tank. A control panel is available on the top of the machine with all buttons on top of the machine to operate each motion.

Major electric elements

Button SB3:  Start pump

SB2:  Stop pump

SA:   Switch over between STEP and AUTO modes

Button SB4:  Shearing & pressing

Time relay KT:  Control time delay, motor Y-∆

   Proximity switch SQ1: Send out signal in sensing cutoff and pressing movements reach position.

   Proximity switch SQ2: Send out signal in sensing it returns to end

Electric principle

The auto switch QF operates to switch on or off the power supply.

Start and stop of the motor

When switching on the power, the indicator light becomes luminous. Push the button SB3 and the normal open contacts 3-4 of AC contactor KM1, normal closed contacts 3 – 21 of the time relay and normal closed contacts 21-23 of KM2 will get powered. And the coils of KM1 and KM3 get on, too. KM1 and KM3 are closed. The motor is started in star mode. The time relay delays about 3-5 seconds as KT1 preset. Now the normal closed contacts 3-21 get open while normal open contacts 3-22 get closed. The KM2 coil gets on while KM3 coil off. Thus AC contactor KM2 gets closed and KM3 is open. The motor is connected in a delta mode. And the motor runs regularly. Push SB2 to disconnect the contactor and the motor stops.

 

4.4.3 When the motor starts up, turn SA to STEP to operate the machine in step mode, i.e. pushing SB2 once will perform one step motion. If you turn SA to AUTO, the machine will do shearing, return, pressing and open continuously.

 

Hydraulic system

Please see Hydraulic Schematics.

Consists of oil tank, pump unit, valve unit and hydraulic piping. Its working pressure is set normally at 21MPa and max pressure should not be above 25MPa.

The oil tank is a steel weldment. On the front face there is a repair opening for convenience in cleaning. There is a oil leveler and thermometer (Type YWZ-150T), air filter (Type EF8-120, a port to fill oil and filtering device) on its top face. Also filter fleece is available for rough filtering.

Pump unit consists of motor-pump combination made up of motor type Y250M-6 and axial piston style pump type 160YCY14-1B with a nominal pressure 31.5MPa and a flow rate 160 ml/rev. It stands on the tank surface. It takes in oil by way of self suction and acts as a power source.

Valve unit consists of special valves, including electrolyte change valve and overflow valve. They are center of the system.

Hydraulic piping system connects between the power source and executive units, passing over energy. High pressure steel pipes are available for all fixed piping while high pressure rubber pipes for movable piping.

Major hydraulic elements

High pressure axial piston style pump type 160YCY14-1B with a displacement 160 ml/r and nominal pressure 31.5MPa. It distributes oil through distributor disc and its body rotates. It features a  static hydraulic balance between slide shoes, variables and distributor disks. It supplies for the system a high pressure work oil. Please see PUMP STRUCTURE.

→ High pressure oil flows into the bottom cavity (d) of the variation body 302 via passages (a),(b),(c) →  Then into passage (f) and servo piston (312) via (e) → When a push is produced, the oil gets into top cavity (g) and pushes the variation piston (301) to move downward. Now the pump increases flow. → When the push at the bottom of the servo piston gets greater than the spring push force, the servo piston will move upwards to close the passage (h) while get the oil in the (g) cavity to flow pass passage (i). → Now it dumps. With the variation piston moving upwards, the flow is decreasing.

5.5.2 Electrolyte change valve: Type HWEH25G60B/EW220, nominal pressure 31.5MPa, flow rate 25 litre/min. A leading valve operates it and it in turn controls the main oil circuit to diverse its flow.

It consists of valve body (1), core (2), reset spring (3) and leading valve with elecro-magnet. The core (2) can stay in middle or at starting position, thanks to the spring force. Spring cavity connects to T cavity (leading valve) and let the oil go from the passage (7) into the leading valve (4). When the magnet gets on, valve(4) changes to have the oil push the core (2) to move. And thus all ports act as slide valves to change oil flow. Vise versa, when the magnet gets off, the core will come back to its mid position. The oil inside the spring cavity comes out of the outer port Y or inner passage T via the leading valve.

Please see its structure drawing.

 

High pressure overflow valve type YF-B20H4, with a set pressure range from 16 to 32MPa, serves to adjust system pressure and keep a stable and constant pressure like a safety valve.

One-way valve type S25A32 locating at the outlet port of the pump is used to keep a backup pressure to warranty the core is sure to diverse.

Hydraulic principle

Pressing and cutoff: → Push the button CUTOFF and the magnets YV1 & YV3 will get on. The electrolyte valve changes to let oil flow from valve 9 and 10 to the rear cavities of cutoff and pressing cylinders. The two cylinders act in order to achieve shearing and pressing.

Return: → Press heavily the button STOP and it will perform its 2nd function “return”. → YV2 gets on and solenoid valve changes to let the oil go from valve 9 & 10 to the rear cavities of cutoff and pressing cylinders. → The 2 cylinders return respectively.

Installation & Test

Installation

Foundation should be done as per the foundation drawing prior to the arrival of the machine. It is not as important for the machine produces no heavy vibration in operation. A floor of concrete 189mm deep is just OK. In outdoors, a ceiling is necessary to safeguard the electric apparatus.

Place the machine into position as per the foundation drawing.  Level the machine. And then place the tank on the foundation. Clean oil pipes and fittings. While the oil pipes are laid according to the hydraulic schematics, please not forget put in seal rings.

Hook up the wires according to the wiring diagram and also secure all connections.

Make sure all mechanical, electrical and hydraulic connections and joints correct and reliable. Now Hook in the mains power source into the power cabinet.

本公司专业生产箱式剪切机、不锈钢打包机、重型打包剪切机、移动式打包机、打包剪切机、轮式抓钢机、打包机（金属打包机）、剪切机（金属剪切机）、屑并机、废纸打包机引领废钢回收设备新时代。

电话：15861655469陈先生

www.yeyadabao.com

www.yeyazhizao.com