Malaysian Doshin Rubber Products (M) SDN. BHD. commissioned a company to develop a 2400-ton rubber bearing compression-shear test system called e-lab 200. After finishing the mainframe, 2,400 tons of vertically loaded actuator and hydraulic power station, the contract was terminated. Because the supplier did not complete a test which can meet the accuracy requirements of Japanese rubber bearings buyers on a similar small load compression shear test system of Doshin.
When visiting the National University of Singapore, Doshin’s engineer saw the perfect performance of the 2000-ton two-way structural test system manufactured by Popwil for the National University of Singapore. So they offered a new contract to Popwil to complete the project of e-lab 200 manufacturing. The time of delivery is three months. Deadline is April 20th. It is the final completion date of the inspection report of rubber bearings purchased by Doshin’s Japanese customer.
According to the status of the e-lab 200 and the test requirements, the engineers from Popwil designed an electro-hydraulic-servo controlled system to accomplish the project. This system includes an accumulator station, a hydraulic control valve group, a set of pipeline, an auxiliary oil tank, a hydraulic distributor, a dual-channel IPC controller and software. The most important part of the new system is two exchangeable actuators with ± 1200mm ram stroke but different loading ability. One is 50 ton, the other is 250 ton. The debugging was completed just before April 20 which is the deadline specified by Doshin’s Japanese customer, and the test was completed perfectly, helping Doshin keeping this customer.
The e-lab 200 when Popwil took over is shown as bellow.
Photo of e-lab 200 when Popwil took over
After finishing the manufacture, inspection and test of the added hydraulic parts, the controller and software in China, Popwil engineers went to Doshin in Malaysia. In just 20 days, Popwil engineers finished the installation and debugging of the vertical displacement measuring unit, the horizontal actuator, the accumulator group, the hydraulic distributor, the control valve group, the auxiliary oil tank and associated pipeline, the control electric cabinet, the IPC controller and application software. The specimen test was perfectly finished just before April 20th, the deadline specified by the Japanese customer. The scene photos of the completed e-lab 200 are as follows:
E-lab 200 side photo after completion
E-lab 200 front photo after completion
Undergoing compression and shear tests on rubber bearings after completion
Doshin was satisfied with the work of Popwil about the project of the e-lab 200. There was no problem after nearly a year of use. The stability and reliability of the equipment are far exceeded the Level that of other Doshin’s compression and shear testing machine. Therefore, Popwil was offered the second contract by Doshin in which required the use of Popwil control systems and software to upgrade their existing 5,000-ton rubber bearing compression-shear test system e-lab 150.
This machine had a PLC controller, one Rexroth’s non-standard hydraulic station, a 5000 ton vertical load actuator with 300mm piston stroke, and a 500 ton horizontal load actuator with 2000mm piston stroke. Doshin required the upgraded e-lab 150 should have the same system reliability and test accuracy with the e-lab 200 after upgrading.
The project started in October 2019. The installation and commissioning began in January 2020. All work was completed before the February 2020.
The following pictures are the scene photos of e-lab 150:
e-lab 150 photo before retrofit
Photo of e-lab 150 after retrofit
Photo of e-lab 150 control software interface