Mechanical-Electronic-Hydraulic Integration: Light Load Linear Reciprocating Motion Device Having Variable Frequency, Displacement and Velocity

2011 ◽  
Vol 279 ◽  
pp. 377-381
Author(s):  
Ming Zhe Zhang ◽  
Wei Wang ◽  
Dong Ning Su ◽  
Kang Min Zhong ◽  
Zhi Ming Sui
Keyword(s):  
Environmental Pollution ◽  
Hydraulic Cylinder ◽  
Pneumatic Cylinder ◽  
Variable Frequency ◽  
Stepping Motor ◽  
Reciprocating Motion ◽  
Oil Leakage ◽  
Light Load ◽  
Position Precision ◽  
Space Layout

The light load linear reciprocating motion device driven by a small-size pneumatic cylinder is most economical, but its velocity and location precision is not good. When substituting the drive for small-size hydraulic cylinder, the significant shortcoming is environmental pollution. If the motion is achieved through rolling screw-nut mechanism driven by stepping motor, the space layout is very inconvenient. A light load linear reciprocating motion device integrating mechanical, electronic and hydraulic technology is designed. In this device, the motion is achieved through short-stroke rolling screw-nut mechanism driven by stepping motor, and then amplified by a splendid internal reflux area effect stroke amplifier. This device has the following noticeable advantages: (1) The location of output hydraulic cylinder is as convenient as common pneumatic or hydraulic cylinder. (2) The frequency, displacement and velocity of reciprocating motion can be altered convenient by programming. (3) Higher position precision. (4) The hydraulic fluid in the device is enclosed, so there is no environmental pollution causing by oil leakage and volatilization.

Energy-Saving Design for Hydraulic Cylinder Reciprocating Seal Based on QFD

2010 ◽  
Vol 44-47 ◽  
pp. 1146-1150 ◽  
Author(s):  
Qing Qing Zhang ◽  
Fu Ying Zhang
Keyword(s):  
Energy Consumption ◽  
Environmental Factors ◽  
Environmental Pollution ◽  
Energy Saving ◽  
Hydraulic Cylinder ◽  
Customer Requirements ◽  
Oil Leakage ◽  
Technical Requirements ◽  
Before And After ◽  
Design Requirements

An energy-saving design for hydraulic cylinder reciprocating seal is proposed in this paper to improve using efficiency of seal, and reduce environmental pollution and energy consumption caused by oil leakage. HOQ of QFD is utilized to translate customer requirements into technical design requirements controlled by environmental factors, and the conflicts between technical requirements are obtained. TRIZ theory is used to resolve the conflicts, and gets energy-saving design solutions. The energy consumption compare between before and after improving seal is presented to illustrate the validation of the methods.

Design of the variable frequency oscillator in DC-DC converter

Circuit World ◽  
2019 ◽  
Vol 45 (2) ◽  
pp. 80-85
Author(s):  
Tian Lei ◽  
Nan Gong ◽  
Li Wang ◽  
Qin Qin Li ◽  
Heng Wei Wang
Keyword(s):  
Supply Voltage ◽  
Operating Frequency ◽  
Maximum Deviation ◽  
Variable Frequency ◽  
Cmos Process ◽  
Power Supply Voltage ◽  
Output Stage ◽  
Content Type ◽  
Oscillator Frequency ◽  
Light Load

Purpose Because of the logic delay in the converter, the minimum turn on time of the switch is influenced by the constant time. When the inductor current gets to the threshold of the chip, the control signal will delay for a period. This makes the inductor current rising with the increasing of the clock and leads to the load current out of control. Thus, this paper aims to design an oscillator with a variable frequency protection function. Design/methodology/approach This paper presents an oscillator with the reducing frequency applied in the DC-DC converter. When the converter works normally, the operating frequency of the oscillator is 1.5 MHz. So the inductor current has enough time to decay and prevent the power transistor damaging. After the abnormal condition, the converter returns to the normal operating mode automatically. Findings Based on 0.5 µm CMOS process, simulated by the HSPICE, the simulation results shows that the frequency of the oscillator linearly decreases from 1.5 MHz to 380 KHz when the feedback voltage less than 0.2 V. The maximum deviation of the oscillator frequency is only 6 per cent from −50°C to 125°C within the power supply voltage of 2.7-5.5 V. Originality/value When the light load occurs at the output stage, the oscillator frequency will decrease as the load voltage drops. The test results shows that when the circuit works in the normal condition, the oscillator frequency is 1.5 MHz. When the load decreased, the operating frequency is dropped dramatically.

Research and Application of Energy Saving Technology of Inverter in Light Load

2014 ◽  
Vol 577 ◽  
pp. 498-501
Author(s):  
Jiu Yan Zhou
Keyword(s):  
Energy Saving ◽  
Induction Motor ◽  
Induction Motors ◽  
Speed Control ◽  
Variable Frequency ◽  
Light Load ◽  
Variable Voltage ◽  
Energy Saving Technology

In order to analysis the variable-voltage energy saving theory and its implementation for induction motor with light-load in detail, This paper gives out a variable-voltage energy saving method, and discusses the design of variable frequency adjusting speed control and the points of attention. It is useful for the application of energy saving technology for induction motors.

Fabrication of Hydro-Pneumatic Crane for Automobiles

2018 ◽  
Vol 7 (3.34) ◽  
pp. 379
Author(s):  
Nagasankar P ◽  
Tamilselvi P ◽  
Satheesh Kumar S ◽  
Someshwar D
Keyword(s):  
Material Handling ◽  
Hydraulic Cylinder ◽  
Project Work ◽  
Pneumatic Cylinder ◽  
Main Principle ◽  
Air Compressor ◽  
Material Handling Equipment ◽  
Hand Pump

This work applies the fabrication of Hydro pneumatic crane (HPC) which can be used for removing and installing heavy objects such as engines and transmissions from vehicles. The intention of using this project work is to gain knowledge in the field of material handling equipment. This work has dealt with the fabrication of the portable jib crane. The main principle of this project is, the hand pump present in the normal hoist crane is replaced with hydraulic cylinder. The hydraulic piston is coupled with pneumatic pistons, and the hydraulic piston is connected to the boom. The pneumatic cylinder is pumped by air compressor. By calculating rated power of HPC and compared with the existing crane we will prove that the system will work under automated condition without compromising the efficiency of the system. 

Direct-Drive Differential Volume Control Electro-Hydraulic Servo Control System

2013 ◽  
Vol 433-435 ◽  
pp. 991-994
Author(s):  
Zhu Xin Zhang ◽  
Tuo Jia
Keyword(s):  
Control System ◽  
Dynamic Performance ◽  
Hydraulic Cylinder ◽  
Servo Control ◽  
Volume Control ◽  
Direct Drive ◽  
Reciprocating Motion ◽  
Servo Control System ◽  
Hydraulic Servo ◽  
Motion Characteristics

Direct-drive volume control electro-hydraulic servo control system, derivation model of single-rod hydraulic cylinder system, pointed out that when the reciprocating motion characteristics are inconsistent. In order to solve this problem, proposed direct-drive differential volume control electro-hydraulic servo system design of its control system and analysis of system models. Through theoretical analysis, validate this proposed direct-drive bad dynamic volume control system, symmetric dynamic performance, improving control system reliability.

Configuration and Optimal Control of Hydraulic/Pneumatic Hybrid Actuator with 2-DOF

2001 ◽  
Vol 13 (3) ◽  
pp. 238-244
Author(s):  
Atsushi Ohtomo ◽  
◽  
Yasuharu Sasaki
Keyword(s):  
Optimal Control ◽  
High Speed ◽  
Position Control ◽  
Control Method ◽  
Hydraulic Cylinder ◽  
Pneumatic Cylinder ◽  
Large Power ◽  
Optimal Control Method ◽  
Hybrid Actuator ◽  
Stable Control

A pneumatic actuator outputs large power in proportion to weight and can be installed in an inexpensive, light and compact configuration. From the standpoint of controllability, however, it is weak due to nonlinearity by compression and delayed transfer of air, it has a problem of poor accuracy in position control. To solve such problem, we propose a hydraulic/pneumatic hybrid actuator that has a pneumatic cylinder and hydraulic cylinder in parallel and uses the hydraulic cylinder as damper. We demonstrate that it can be used in practice and structurally applying it to a manipulator with 2-DOF. It also demonstrates that high-speed and stable control can be achieved by applying optimal control method.

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