Technical Specifications
| Maximum energy (J) | QualiDWTT™ 30kJ | QualiDWTT™ 40kJ | QualiDWTT™ 50kJ | QualiDWTT™ 60kJ | QualiDWTT™ 80kJ | QualiDWTT 100kJ |
| |
| Drop Height (m) | |
| Max. vertical drop height (m) | 3 | 2.6 | 2.6 | 3.1 | 3.2 | 4.1 |
| Impact velocity (m/s) | 5.4<v<7 | 5.4<v<7 | 5.42<v<7 | 5.4<v<7.9 | 5.4<v<7.9 | 5.4 <v<8.96 |
| Resolution | 1 mm |
| Accuracy | ± 2mm |
| Drop weight (kg) | |
| Mass of drop weight frame (kg) | 630 | 800 | 1000 | 1300 | 1300 | 1300 |
| Mass of weight increments (kg) | 19.5 | 30 | 50 | 50 | 50 | 50 |
| Quantity of weight increments | 20 | 27 | 20 | 24 | 24 | 24 |
| Total mass of drop weight (kg) | 1020 | 1610 | 2000 | 2500 | 2500 | 2500 |
| Mass deflection | ±0.5% |
| Max. Raising speed (m/min) | 4 |
| Dimensions & Weight | |
| Dia. of guide column (mm) | Ø110 | Ø110 | Ø110 | Ø110 | Ø200 | Ø200 |
| Dia. of post (mm) | Ø155 | Ø155 | Ø155 | Ø155 | Ø200 | Ø200 |
| Overall height of tower(m) | 6.2 | 6.2 | 6.2 | 7 | 7 | 7.4 |
| Gross weight of tower(kg) | 12000 | 14000 | 14000 | 15000 | 18000 | 20000 |
| Striker | |
| Radius of curvature | 25.4 00 ± 0.1 mm |
| Centerline with respect to center of anvil supports | 0mm ±1.0mm |
| Complies with | API 5L3, ASTM E436, EN 10274 |
| Anvil | |
| Radius of curvature | 15.0mm ±0.1mm |
| Span | 254.0mm ±1.0mm |
| Complies with | API 5L3, ASTM 436, EN 10274 |
| Specimens | |
| Width | 76.0mm ±3.0mm |
| Length | 305mm±50.0mm |
| Thickness | 6mm to 50mm |
| Notch depth | 5.1mm±0.51mm. Notch angle 45°±2° |
| Notch radius | 0mm to 0.05mm |
| Planarity | 5mm |
Can accommodate specimens prepared according to standards | API 5L3, ASTM 436, EN 10274 |
| Notch type of specimen | Pressed or Chevron |
Drop Tower
The structure of the drop weight tower is a 4-support-post & 2-guide-column structure, of which two are used for guiding the hammer and another four posts are for supporting purposes. The servo-controlled hoist motor is installed at the side of the bottom plate, which facilitates the maintenance.
The top plate of drop tower is a complete steel plate of 50 mm thick, on which two pulleys and protective enclosure are installed, and the hoist rope is passing through the two pulleys. The bottom plate of the drop tower is made of cast iron which has excellent anti-impact performance.
The guide columns are firmly mounted between the top plate and bottom plate through a flange interface, and the parallelism degree should be controlled within 0.1/1000. Those columns adopt hollow 45# steel tube, and it is hardened and tempered, the outer surface is electroplated.
Four solid posts ensure the high stiffness
Two guide columns to ensure that the drop weight hit right in the center of specimen, chrome-plated surface ensure the longest life as well as lowest friction
Ladder to access top to facilitate installation and maintenance
Enclosed by squared mesh panels secure the whole drop tower from top to bottom
The drop weight is made of 20# steel plate. For user’s convenience, we will provide one set of special tools to facilitate loading and unloading weight increments into drop weight framework. The total weight increments of drop weight can be free adjusted, with which the user can regulate impact energy by adjusting the lifting height and quantity of the weight increments.
The hammer tip and hammer structure is separated; the hammer tip is a quick wear component, so it is easy to replace the hammer tip when necessary. The material of striking edge is 5CrW2Si and its hardness can reach HRC50－57 through heat treatment.
Heavy Duty Industrial Shock Absorber
Shock absorbers decelerate the loads quickly, gently and without any recoil or bounce back. Also, they are ideally suited for a simple and quick installation, e.g. in handling devices, rotary actuators, linear cylinders, linear cylinders and many more industrial applications.
Shock absorber bodies and inner pressure chambers are fully machined from solid high-tensile alloy steel. This gives a completely closed-end, one-piece pressure chamber with no seals or circlips being necessary. The shock absorbers are maintenance-free, self-contained hydraulic devices with the most innovative sealing technology and an extremely compact design.
The anvil is mounted on the bottom plate, and it uses alloy 5CrW2Si who has sufficient hardness, its hardness can be up to HRC50-57 after heat treatment
Note: Tup with load cell inside is for data acquisition option (instrumented DWTT)
Winch
Easy to access for periodic inspection and maintenance
AC brushless servo motor fitted with brake, driving sling via a precision gearbox
To collect the fractured specimen and flying debris, the anvil is designed with a slope and make specimen slide along the slope and the specimens are collected on the belt at the bottom plate and then they are transported out of the tower by the conveyer belt.
Protective case secures the whole operation area
QualiTSB™ Series of Temperature Soak Bath (Low-Temperature Chamber & Temperature-Measuring /Controlling System
Qualitest Temperature Soak Bath system can accommodate up to 10 (optional 12 pieces) specimens of thickness up to 50mm with a minimum 26mm gap between each specimen. External construction is made from Zinc-coated mild steel sheet. External surfaces finished in stoved epoxy paint, while the internal bath and guides are made from 304-grade stainless steel.
Qualitest’s Automatic Specimen Feeding System available for our range of DWTT’s is pneumatically operated pick and place system with Load cycle time < 9s with an accuracy of placement of specimen within ± 0.5mm (X & Y axes)
- Platform: PC running Microsoft Windows XP / 7. Supplied system minimum specification of 4GB RAM, 120GB hard drive, CD-RW, 21” display.
- Environment: Compatible with MS Office 2003/XP and above
- Purpose: Control of impact testing sequence and analysis of impact data
- Access control: Two, password-protected levels, 1) Operator access, to perform pre-defined DWTT tests. 2) Administrator access, to control the type of test performed and the required documentation information etc. also for sensitive configuration and calibration functions.
- Language: The DWTT system has a Human Machine Interface that is easy to use and works in English only, other languages upon request
Safety features of this unit are compliant with the European CE machinery safety directive (89/392/EEC & 91/368/EEC – machinery safety). Electrical and mechanical safety interlocking. Testing is possible only after checking of all safety parameters, to comply with OSHA requirements (USA).
- Access to specimen area protected by interlocked doors when the machine is running
- Emergency stop function electrically isolates winch drive and release.
- All safety systems dual circuit and fail-safe.
- No unsafe release of the drop weight possible under any of the following conditions:
- Failure of mains power supply
- Failure of compressed air supply
- Failure of control software
