SUMMARY OF THE INVENTION

For the shortcomings and deficiencies of the prior art, the present invention is to provide a vertical cylinder axis servo testing machine, the stress field of direct two-way hydraulic drive. It not only to achieve synchronization and load center of symmetry, and to complete the biaxial tensile, compression, fatigue and mechanical experiments, but also has speed convenient, speed range, work is relatively stable, fast response, quick start, braking and frequent commutation advantages.
The technical program are as follows:

A vertical cylinder axis servo testing machine, the test machine includes vertical hosts, the hydraulic pressure source and control system, including the vertical frame of the host, the horizontal and vertical directions load transmission, characterized in that : said horizontal and vertical directions are used to load transmission loading servo drive, said servo system includes loading servo cylinder, servo valve, locking pad, the load cell, hydraulic chuck, linear guide rails disposed in the hydraulic chuck and bit transfer guide plate means; said servo cylinder via a piston rod locking pad connected to one end of the load sensor, and the other end connected to the hydraulic chuck; said hydraulic chuck the guide plate on slide rails, the guide plate is installed position transfer means; said bit transfer means comprises electromagnet, and the nip with perforated plate, through the perforated guide plate disposed in the lower part of the guide bar The displacement sensor and the restoration of springs; said electromagnet and plywood with perforated and caught a 90 degree installed on the host framework; Looper in the displacement sensor guide rod, and fixed in the guide plate; said The return spring set of two springs disposed symmetrically on both sides of the vertical displacement sensor, each of the two ends of the spring and the guide bar with the displacement sensor is connected.

The control system includes a level control system and a vertical control system, said horizontal and vertical control system contained in both types of control loops and feedback loops, each of said control loop includes a servo control loop, and central control loop servo control loop contains a computer connected to a computer function generator, D / A card, servo amplifier and servo compare PID regulator, the function generator uses to produce sine wave, triangle wave, square wave , ramp function generator or a combination of waves, said computer the D / A card, respectively, the comparison amplifier and servo PID regulator and the servo control status selector, the said servo PID regulator respectively, through the other end of the first a servo drive and the second servo drive is connected to the first servo valve and a second servo valve connected to said control state selector with the first and second displacement sensors, respectively, a first and a second strain sensor connected to a load sensor; wherein control loop includes a computer center, D / A card centers in amplifier, the center PID regulator, said computer via D / A card and a center comparison amplifier PID regulator respectively connected with the center and the center positioned selector, the said the center of the end of the PID regulator through the first servo drive and the second servo drive is connected to the first servo valve and a second servo valve connected; positioning the center of the other ends of the selector and the first and second displacement

Sensors, the first and second load sensors. The feedback loop includes a computer, A / D card, the first and second displacement sensors, first and second load sensors and strain sensors, said first and second displacement sensors, first and second load sensors and strain sensors respectively, through the A / D card connected to the computer.

The hydraulic pressure source includes inlet oil, return line; said intake passage through the pump unit, pressure filter, into the oil accumulator, servo control circuit is pided into oil and hydraulic chuck, which servo control circuit includes four branches, which are controlled by the horizontal and vertical loop servo valve and servo cylinder connected to the hydraulic chuck oil pressure relief valve is pided into four branches by superposition, they are through the solenoid valve and the hydraulic chuck cylinder connecting; said return line, including overflow circuit and main circuit, said overflow route back to three relief valve connected to the main circuit; said main circuit through the intake passage of the corresponding described eight branches and back to the oil accumulator, plate heat exchanger, return filter is connected. 双轴四缸电液伺服试验机英文文献和中文翻译(2):http://www.751com.cn/fanyi/lunwen_15487.html