Mid bounce rebound device

Mid bounce rebound deviceIt is mainly divided into two categories: mechanical rebound instruments and digital rebound instruments. The digital display series has become the mainstream choice for modern engineering testing due to its advantages of intelligence and dataization.

How to choose the appropriate one based on engineering requirementsMid bounce rebound devicemodel?

Test object: concrete, brick or mortar?

Select ZC3 series for ordinary concrete; High strength concrete is selected from ZC450/550 series; Choose ZC75-D or ZC4 for masonry bricks; Choose ZC20-D or ZC5 mortar.

Functional requirements: Do you need functions such as automatic data recording, automatic strength calculation, Bluetooth transmission, etc?

All digital display series can meet the requirements, but high-end models (such as U-shaped) may provide faster processors, larger storage, or stronger anti-interference capabilities.

How to perform daily calibration of rebound tester?

According to the JJG 817 verification regulation, the rebound tester should be calibrated on the calibration steel anvil before and after each use

Operation steps:

Place the steel anvil firmly on a horizontal surface

Clean the surface of the steel anvil and the rebound hammer rod of the rebound tester

Strike vertically downwards on the steel anvil three times and take the average value

Qualification standard: The calibration value should be 80 ± 2 (for medium-sized rebound testers)

If it exceeds the range, the instrument needs to be cleaned or sent for inspection

Suggestion: Calibrate before and after each testing day to ensure reliable data.

What are the maintenance points of rebound tester?

Cleaning: After each use, wipe the striking rod and housing with a soft cloth to prevent dust from entering

Rust prevention: When not in use for a long time, apply a small amount of rust prevention oil on the surface of the striking rod

Verification: At least once a year, it shall be sent to a legal metrology institution for verification

Storage: Store in a dry, vibration free environment, avoiding high temperatures and humidity

Accessory inspection: Regularly check the wear of springs, impact rods, pointer sliders, etc., and replace them in a timely manner

ZC3-A Concrete Rebound Tester Technical Parameters:

● Nominal kinetic energy: 2.207J

● Pointer length: 20.0 ± 0.2 (mm)

● Pointer friction force: 0.65 ± 0.15 (N)

● Spherical radius at the end of the firing rod: R25 ± 1.0 (mm)

● Working length of rebound spring: 61.5 ± 0.3 (mm)

● Stretch length of the spring during impact: 75 ± 0.3 (mm)

● Jump position of the hammer: at "0-1" on the scale

Steel anvil calibration value: 80 ± 2

● Elastic spring stiffness: 785 ± 30N/m