Drop Weight Impact Tester 30000j-100000j

Functions
This type of machine is especially designed for drop-weight tear tests of ferritic steels

Standards
GB/T 8363, ASTM E436, API RP 5L3

Features
1.       SIMENS PLC controls and touch screen provide high reliability and versatility.
2.       Automatic specimen feeding and automatic positing
3.       Frame structure is made of solid steel plate with high stability under impact
4.       Striker is made of high strength steel plate with high impact resistance
5.       Use chain to lift striker with high precision in height
6.       Self-lock design for striker clamping
7.       Full-closed safety shield
8.       Special design tools for support change

Main frame
The bottom plate is made of solid steel plate, mass is up to 2100kg. Anvil is located onto the center of the bottom plate. Impact force onto the frame will rapidly transmit to the ground. As the impact force applies to the center of the main frame which is at the center of the foundation, foundation area is not so big (3mx3m), after long use, foundation will not decline by vibration, and horizontal level of the main frame will not change too.
Striker lifting system
Imported servo motor is used for the lifting system, with small size, light weight, high efficiency, low noise, and high stability. Compared with common motor, servo motor is better in accuracy, response characteristic, over-load resistance, speed change performance, and torque characteristic. Use chain to lift striker with smaller elasticity and higher accuracy than wire rope. Chain has higher strength, higher abrasion resistance and safer than wire rope. The lifting motor is located at the bottom of the frame, easy to mount and maintain.
Damping device
As the test standard requires only one drop can tear the specimen, there is big residual energy after impact. Sometimes, the residual energy may reach several thousand or even more than ten thousand joules.  Under low temperature impact test, the residual energy may be much higher. In this case a damping device is necessary and it will affect the service life of the impact machine. We specially design one kind of hydraulic damping device. Its structure especially the damping hole is strictly calculated and proofed after plenty of tests. Single damper can absorb up to ten thousand joules. The whole process is very stable, minimizing the impact to the machine. Both dampers have the same performance, extending the service life of the equipment.
Guard screen
There are full closed guard screen around the main frame to prevent broken specimen from splitting, also prevent operators from entry to the frame inside. Guard screen has door limit switch. When the door is open, the machine will lock automatically. Therefore it will avoid wrong operation and guarantee the safety of operator.
Control system
Control system in this machine provides automatic operations for striker lifting, zero positioning, specimen auto-feeding, impact, and striker clamping, which greatly reduces labor intensity and improves working efficiency and operating safety. Simens PLC programmable controller is used for the whole control system, touch screen is used for terminal operating interface, rotary encoder is used for sampling and controlling the height. PLC features high stability and reliability and strong anti-interference ability, avoiding any fault operation and improving safety of operators. Meanwhile this control system has alarm functions for such errors: specimen is not in the right position, striker is not locked, and guard screen is wrong, striker is not lifted to the correct position.