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Application of Flextronics SD610 in hydraulic press

(Summary description)The process of the hydraulic press is generally divided into short-range free-fall, slow-down, work pressurization, pressure holding, pressure relief return, floating crimping and ejection, etc. The working pressure and flow required for each action are different. In the hydraulic system of the dosing pump, the pump motor provides a constant flow rate at a constant speed, and the pressure and flow rate required for operation are regulated by the pressure proportional valve and the flow proportional valve by adjusting the opening of the pressure or flow proportional valve. To control the size of the pressure and flow. Excess hydraulic oil flows back through the overflow valve. This process is called high pressure interception. According to statistics, the energy loss caused by high pressure overflow is as high as 36% to 68%.

Application of Flextronics SD610 in hydraulic press

(Summary description)The process of the hydraulic press is generally divided into short-range free-fall, slow-down, work pressurization, pressure holding, pressure relief return, floating crimping and ejection, etc. The working pressure and flow required for each action are different. In the hydraulic system of the dosing pump, the pump motor provides a constant flow rate at a constant speed, and the pressure and flow rate required for operation are regulated by the pressure proportional valve and the flow proportional valve by adjusting the opening of the pressure or flow proportional valve. To control the size of the pressure and flow. Excess hydraulic oil flows back through the overflow valve. This process is called high pressure interception. According to statistics, the energy loss caused by high pressure overflow is as high as 36% to 68%.

Information

Ⅰ.The hydraulic press

The process of the hydraulic press is generally divided into short-range free-fall, slow-down, work pressurization, pressure holding, pressure relief return, floating crimping and ejection, etc. The working pressure and flow required for each action are different. In the hydraulic system of the dosing pump, the pump motor provides a constant flow rate at a constant speed, and the pressure and flow rate required for operation are regulated by the pressure proportional valve and the flow proportional valve by adjusting the opening of the pressure or flow proportional valve. To control the size of the pressure and flow. Excess hydraulic oil flows back through the overflow valve. This process is called high pressure interception. According to statistics, the energy loss caused by high pressure overflow is as high as 36% to 68%.

 

Ⅱ.The hydraulic press

 

The hydraulic press (a type of press) is a working medium through a special hydraulic oil. The hydraulic pump is used as a power source, and the hydraulic oil is passed through the hydraulic line into the cylinder/piston by the force of the pump, and then there is a cylinder/piston. Several sets of matching seals, the seals in different positions are different, but they all play a role in sealing, so that the hydraulic oil can not leak. Finally, through the one-way valve, the hydraulic oil is circulated in the fuel tank to make the cylinder/piston cycle work to complete a certain mechanical action as a kind of machine for productivity.

 

Ⅲ.Introduction to SD610 Electro-Hydraulic Servo System Introduction to SD610 Electro-Hydraulic Servo System

 

The electro-hydraulic servo system replaces the original heavy-duty pump-asynchronous motor system with the existing precision servo-hydraulic system to realize the on-demand supply characteristics of the hydraulic oil, so that the new hydraulic system has almost no overflow, and its composition Mainly by the following parts:
 
Drive
 
The drive uses a unique motor control algorithm for electro-hydraulic servo characteristics to achieve fast and smooth control of pressure and flow. It has a large margin design, high temperature environment is not running, and installation and debugging are convenient.
 
Among them, our company has developed a liquid-cooled series driver for the harsh working environment, which has the advantages of high temperature resistance, corrosion resistance and environmental impact.
 
2. Motor
 
The permanent magnet servo motor adopts the latest generation of rare earth permanent magnet material, which has small volume, low inertia, high performance, high efficiency, low noise, fast response, stable operation, high control precision, strong overload capability, and obvious power saving effect in continuous load. Features.
 
3. Oil pump
 
Electro-hydraulic servos can be used with gear pumps, plunger pumps and screw pumps due to different environments and requirements.
 
Gear pump: strong anti-pollution ability, long service life, good self-priming, simple structure and convenient maintenance.
 
Piston pump: high precision, good sealing and high working pressure.
 
Screw pump: low noise, high speed and small pulsation.
 
4. Pressure sensor
 
The pressure sensor can be divided into current type (4~20mA) and voltage type (0~10DC). When selecting, please refer to the sensitivity, offset, linearity, hysteresis and other parameters of the product, because the feedback signal directly affects the system. Performance, try to use high-precision, high-sensitivity, linearity of the brand.
 

SD610 electro-hydraulic servo system wiring diagram and site photos

 

Ⅴ.parameter settings

1.Motor parameter self-learning

Function code number

Set value

Function code name

Description

Pr9.02

4

Motor pole pair

Polar logarithm = series/2

Pr9.03

16.5

Motor rated power

Pn=Ne*Tn/9550

Pr9.05

33

Motor rated current

The rated current is twice the power

Pr9.06

100

Motor rated frequency

F= Ne*P/120

Pr9.07

1500

Motor rated frequency

Determined according to the motor nameplate

Pr9.24

2

Motor self-learning selection

Dynamic self-learning

 

When Pr9.24 is set to 2, the driver automatically performs motor parameter self-learning at this time. When the display is digital, the motor parameter self-learning ends.

 

2.Function parameter setting:

Function code number

Set value

Function code name

Description

Pr1.03

350

Pressure sensor range

According to the pressure sensor settings

Pr1.04

1

Pressure sensor feedback signal

0-10V analog quantity

Pr1.07

250

Pressure 10V corresponds to the maximum range

Customer setting

Pr1.09

2000

Flow rate 10V corresponds to maximum speed

Customer setting

Pr1.10

5

Underflow

Defaults

Pr1.11

1

Bottom pressure

Defaults

Pr2.02

1

Servo start and stop signal selection

Terminal enable control

Pr7.01

50

Jog speed setting

Customer setting

 

Ⅵ.Debugging instructions

 

1. When setting the parameters, press the JOG jog button to judge the motor direction. If the motor is reversed, please change the two motor wires arbitrarily, and then re-calculate the motor parameters. Remember to judge the motor direction first.
 
2. Monitor the values of U-01, U-02, U-03, U-04, U-05 and U0-12 during commissioning.
 
3. When setting the parameters, please turn the enable off to ensure that the green Run light is off, because the drive parameters cannot be set when the Pr2.02=1 terminal is enabled.

 

Ⅶ.Summary

 

The Flextronics SD610 electro-hydraulic servo system can detect the pressure and flow signals from the hydraulic system of the hydraulic press in real time, adjust the speed of the motor required for each working condition in real time, and let the flow and pressure of the pump output meet the needs of the system. In the state, let the motor run at a low speed, how much is really to be given, and the energy saving space is huge. Under the premise of satisfying customers' performance and stability, Flextronics SD610 electro-hydraulic servo system perfectly solves the requirements of cost, efficiency, oil temperature and precision of customers. Electro-hydraulic servo drive technology is the future development direction of hydraulic presses.

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