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The geotextile effective aperture measuring instrument is a specialized device designed for testing the effective pore size of various types of geotextile products. It consists of several key components, including a base plate, a cover, a holder, a screening system, and a sprinkling mechanism. The base plate features four mounting slots at its corners, allowing it to be securely fastened to a foundation or workbench using bolts. On the upper left corner of the cover, there is a control panel equipped with a counter, a power switch, and a start button. To minimize vibration interference, the cover is not directly connected to the vibrating screening device.
A sprinkler system is mounted on the right side of the base plate, consisting of an inlet pipe, a flow switch, a metal hose, and a shower head. A waterproof cover is attached to the shower head for protection. When in use, the shower head is placed inside a transparent cover and secured with a splash-proof cover and a clip to prevent water from spilling out. The collecting trough is rigidly connected to the vibrating head, with a collection tube located on the left side and a support tray underneath the trough.
To prepare for testing, the sample is laid on the grid, secured with the geotextile holder, and pressed tightly using a flip bolt and star handle. If the holder is difficult to remove due to sealing requirements, a sealing ring is installed on the outer wall of the holder, and two long-groove bolts are used. By rotating the geotextile cover bolt in reverse, the bayonet mechanism lifts the holder, making it easier to handle.
This instrument operates according to the GB/T 17634-1998 standard, which outlines the wet sieving method for determining the effective pore size of geotextiles and related products. It uses a single layer of geotextile without tension as a screen, and during the test, water is sprayed onto the sample along with graded granular material at a specified vibration frequency and amplitude. The effective pore size is determined by analyzing the particle size that passes through the sample.
**Operation Steps:**
1. Remove the holder and place the geotextile sample flat on the support grid without applying any force. Press the sample with the holder and ensure it remains level.
2. Spread the selected granular material evenly over the sample according to the standard.
3. Turn on the power switch.
4. Set the vibration time on the timer (typically 600 seconds, as per GB/T 17634-1998). The instrument supports two timing modes: 0–99.99 seconds and 0–99 minutes 59 seconds.
5. Connect the water inlet to a regulated water source. Place the shower head inside the transparent cover, secure it with a splash-proof cover, and fasten the clip. Open the flow control valve to begin spraying.
6. Press the start button to initiate the test.
7. Particles that pass through the sample will collect in the collecting tank.
8. Stop the vibration after the set time has elapsed.
9. Collect the remaining particles and the sample.
10. Process the test results in accordance with the GB/T 17634-1998 standard.
11. After completing the test, turn off the power and clean the instrument thoroughly.
**Technical Specifications:**
- Sieve diameter: 200 mm
- Sieve stack height: 400 mm
- Sieve seat amplitude: 8 mm
- Sieve shaking frequency: 221 times/min
- Shock frequency: 147 times/min
- Radius of gyration: 12.5 mm
- Power supply: 380V
- Power consumption: 0.37 kW
- Dimensions: 640 × 430 × 800 mm
- Weight: 50 kg
This geotextile effective aperture measuring instrument is essential for quality control in geotextile production and ensures compliance with national standards. Its design promotes accuracy, ease of operation, and durability, making it ideal for laboratories and industrial applications.