LBTS-50H Seismic Support and Hanger Electric Fatigue Testing Machine

Product Introduction:

The LBTS-50H seismic‑resistant support and hanger electric fatigue testing machine is one of the latest dynamic loading test systems developed by our company. This product series is designed in accordance with relevant standards, including CJ 476 “Seismic Support Testing Standard” and GBT 37267 “General Technical Requirements for Seismic Supports and Hangers in Buildings,” and is capable of performing load‑capacity tests, cyclic loading tests, and fatigue tests on seismic connection components. During its research and development, this series of testing machines has incorporated advanced electro‑hydraulic servo‑based dynamic testing technologies and been tailored to meet the practical operating conditions of domestic users.

Reliability of the test system and the standards on which its design is based:

1. The control system employs an all-digital servo control system.

2. The servo electric cylinder is a modular product that integrates a servo motor with a ball screw, offering precise displacement and load control, low noise, energy efficiency, cleanliness, high rigidity, impact resistance, an exceptionally long service life, smooth motion, and flexible installation and configuration, along with simple operation and maintenance.

3. The servo electric cylinder is equipped with a hinged support, ensuring that it can accommodate varying loading directions during testing and that the actuator remains synchronized with the load application. This design not only guarantees the accuracy of the load cell measurements but also protects the actuator from lateral forces.

4. The load sensors equipped on servo electric cylinders all adopt a spoke‑type structure, utilizing strain‑gauge resistive elements to directly measure the applied load and offering excellent resistance to lateral forces. Currently, this type of sensor is universally employed in fatigue testing systems worldwide.

5. Complies with GB/T 37267 “General Technical Requirements for Seismic Supports and Hangers of Building Mechanical and Electrical Equipment” and CJ 476 “Test Standards for Seismic Supports.”

Technical Specifications:

Main components:

The main components include: one loading frame, four sets of fixtures, one 50 kN servo electric cylinder, and one all-digital servo controller.

1. Loading Frame Structure: A closed‑section square Z‑frame is used as the specimen mounting and actuator loading frame, capable of withstanding horizontal loads; a triangular truss structure supports the horizontal actuator. The gantry frame is fabricated by welding high‑quality structural profiles, ensuring overall…

The structure exhibits high stiffness, and post-weld tempering ensures the frame’s fatigue performance. The cross beams serve as mounting locations for testing and feature adjustable horizontal positioning; each beam is equipped with elongated slots to facilitate specimen installation.

Specifications and quantity of the closed-type square frame: 1 set; the gantry frame can withstand a force of 5 tons.

★ Internal frame length: 3,500 mm; distance from the bottom surface of the crossbeam to the floor: 2,000 mm; internal span: 2,000 mm.

★ A triangular support structure is used to mount the horizontal‑direction actuator, capable of withstanding a force of 5 tons.

★The triangular support structure is equipped with an actuator height‑adjustment mechanism that uses a trapezoidal lead screw and nut for vertical positioning, secured by a T‑slot and T‑block assembly. The height is stepwise adjustable, and the actuator can be further lowered by an additional 500 mm.

★The frame is equipped with an actuator suspension system that balances the actuator’s own weight, ensuring that, during loading, the actuator’s gravitational force is not transferred to the specimen, thereby preventing interference with the test results.

★ Frame 5 and the upright posts are equipped with anchor holes, allowing them to be secured to the foundation using anchor bolts.

2. Servo Actuator:

A servo electric cylinder is a modular product that integrates a servo motor with a ball screw. It converts the rotary motion of the servo motor into linear motion via a screw–nut transmission pair, while translating the servo motor’s key attributes—precise speed control, precise angular‑position control, and precise torque control—into equally precise velocity control, position control, and thrust control. This groundbreaking solution delivers high‑precision linear motion control, featuring highly accurate displacement and load regulation, low noise, energy efficiency, cleanliness, high rigidity, impact resistance, exceptionally long service life, smooth motion, flexible installation and configuration, and straightforward operation and maintenance.

2.1、Rotary Support:

Installed at the front and rear ends of the servo actuator, it ensures compliance with the loading direction and prevents lateral forces from acting on the actuator, thereby extending its service life.

★This bearing features a spherical support and utilizes Longxi self-lubricating joint bearings.

★ Equipped with a preload adjustment mechanism, allowing the bearing clearance to be adjusted to a specified preload.

★Rotary bearings can be used under alternating loads.

★ The support has a rotational range of ±50° and an inclination angle of ±7°.

★Actual product photos are as follows:

2.3 Load Sensor:

The load sensor employs a spoke-type, high‑stiffness design, offering excellent resistance to lateral forces and a high frequency response. It is widely used in systems manufactured by our company and has also found applications in the testing‑machine industry.

Sensor overload capacity: 120% overload capacity.

In conjunction with the measurement and control system, the measurement accuracy is ±0.5%, with a range of 2% to 100%.

The signal source can be connected to the controller. The spoke-type load cell is characterized by:

★ Dual-mode operation, with excellent pull‑and‑push consistency.

★ Fully sealed, with stable and reliable performance.

★Low height.

★ Excellent lateral force resistance.

3.1 The load‑testing fixture for the seismic connection assembly is shown in the figure below. The specimen is securely fastened to the load‑bearing beam via fixture shims, while the opposite end is connected to the electric cylinder using a clamping block. This configuration offers convenient installation, simple operation, and robust connections, thereby meeting the requirements of the test.

3.2 Load Performance Test for Pipeline Construction

The test fixture for the pipeline’s load‑bearing performance is shown in the figure. It ensures secure specimen fixation and applies loads in the X, Y, and Z directions during sustained‑load testing.

3.3 Cyclic Performance Test Fixture

The cyclic performance test fixture adopts a two‑piece design, facilitating easy specimen clamping. The top of the frame is equipped with evenly spaced linear slots, ensuring rapid mounting of the support brackets and significantly reducing the operator’s labor.

3.4 Fatigue Performance Test Fixture

The fatigue‑performance test fixture is machined from high‑quality carbon steel and features a two‑piece design that effectively eliminates clearance while facilitating specimen installation for the operator.

4. Introduction to the Control System

ZLCDynaCtrl All-Digital Servo Controller and ZLCDynaTest Software System

The ZLCDynaCtrl servo controller is a powerful, PCI‑integrated dynamic servo controller designed for research laboratories. Powered by a floating‑point DSP‑based DTC real‑time control and measurement operating system, it features a 0.1‑millisecond closed‑loop cycle time, enabling dynamic waveform control with a 100‑Hz bandwidth. A DMA‑driven hardware FIFO ensures real‑time synchronous data acquisition at 10 kHz, revealing fine details in dynamic tests. A 16‑bit D/A converter with digital chatter suppression enhances the performance of electrohydraulic servo valves. Its sliding‑mode variable‑structure closed‑loop strategy offers robust field adaptability, delivering millisecond‑level step responses. With a one‑click on‑site frequency sweep—no manual tuning required—it automatically identifies feedforward parameters to achieve zero‑phase‑shift sinusoidal response. The Random DynaKit toolbox software autonomously scans deployed controller units, enabling service engineers to freely create and configure parameters according to user needs, perform efficient calibration, and optimize control. Additionally, the OpenTest open‑source software helps developers rapidly prototype applications based on the GtDyna API, facilitating implementation of user‑specific on‑site logic.

ZLCDynaTest Dynamic Control System Software

ZLCDynaTest is an application software that runs on Windows. It integrates the measurement of test force, deformation, and displacement with testing machine control. Its main features are as follows:

High-speed acquisition of test load, displacement, and deformation at 10,000 samples per second.

Real-time display of force–time, deformation–time, and displacement–time test curves, with automatic scaling of the coordinate axes.

Multiple measurement limit protection settings for load, deformation, and position.

Various control and protection functions, including over‑tolerance control.

Various waveform options are available, including sine wave, triangle wave, square wave, sawtooth wave, and custom waveforms, with a maximum frequency of 50 Hz.

Automatic shutdown protection upon specimen failure.

Statistical analysis of multiple test results automatically generates S–N curves, and the analysis outcomes can be exported.

Test data can be saved as data files, and historical data can be retrieved and queried at any time.

Configuration List: