Waterproof series: Dumbbell sampler test process and description - Database & Sql Blog Articles

Dumbbell Sampler

ZSY-28 Type

One,

Dumbbell Sampler

Scope of Application

This device is designed to prepare dumbbell-shaped specimens from non-metallic materials for tensile testing. It offers high efficiency in sample preparation and ensures accurate dimensions. Additionally, it includes a cutting debris absorption system. The machine meets the requirements for I, II, and III type dumbbell-shaped specimens specified in GB/T 1040 "Plastic Tensile Performance Test Method" and GB 8802 "Vicat Softening Point Temperature Measurement Method for Hard Polyvinyl Chloride (PVC-U) Pipe and Tube".

Two,

Dumbbell Sampler

Technical Parameters

1. Total length of the specimen: ≤250mm

2. Width: 20 ~ 50mm

3. Specimen thickness: 0 ~ 12mm

4. Power supply voltage:

380 V

Three,

Dumbbell Sampler

User Manual

1. Prepare a blank sample with the following dimensions:

Type I: Total length 150±1.0 mm, width ≥22 mm

Type II: Total length 115±1.0 mm, width ≥27 mm

(User-owned)

Vicat Sample: Total length ≤50±1.0 mm, width 10+0.5 mm

(User-owned)

Long Strip Sample: Total length ≤250±1.0 mm, width = required size + processing allowance greater than 2mm

2. Loading of Sample Blanks

For Type I, II, and long strip blanks, clamp them directly into the corresponding fixtures. The clamping force should not be too strong to avoid deformation of the sample. Ensure that the blank is clamped securely, and the other surfaces are as symmetrical as possible to ensure uniform processing.

The Vicat sample blank should be loaded as follows:

When the pipe wall thickness is >6mm and ≤8mm, clamp as shown in Figure 1.

If the wall thickness is >8mm, clamp as shown in Figure 2. At this time, the protruding part of the sample should be less than 5mm. After clamping, loosen the fixture and push the sample in the direction of the arrow by less than 5mm, then re-clamp and continue processing until the wall thickness is <8mm. Then clamp as shown in Figure 1 for final processing.

The resulting wall thickness after this process is 4mm.

3. Processing of Samples

3.1 Turn on the power and set the power switch to start the tool shaft. When viewed from above, the tool axis should rotate counterclockwise. Also check that the tool is installed correctly, meaning the blade direction matches the rotation direction.

3.2 For Type I and II samples, close the clamp of the blank toward the tool and process manually, making sure the clamp is close to the outer edge of the positioning bearing above and below the tool. After one side is processed, rotate the jig 180° and process the other side to complete the job.

3.3 Processing of Vicat samples is similar but does not require rotating the fixture 180°; it can be completed on one side only.

3.4 For long strip samples, first loosen the fastening screws, adjust the position of the positioning plate left or right, and set the dimension L according to the sample width. The formula is: L = 1/2 of the sample width + 9 mm. Once adjusted, secure the positioning plate and proceed with processing. During the process, the fixture should be closely aligned with the positioning plate and fed into the tool for machining. After one side is done, rotate the fixture 180° to complete the other side. For short samples, to prevent deformation, multiple samples can be processed together, or a sheet of the same thickness can be clamped alongside the sample in the remaining space.