Load wheel tester "test steps" - Huaqiang Electronic Network

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

MOS power IC full range

Test - lowercase jpg

Kaixin micro test

Load wheel

Sticky sand

Tester

There are mainly motor, gear transmission, transmission crank, connecting arm, weight box, rubber casters and electrical controller with digital display counter.

Ready to work

1,

Prepare coarse and fine aggregates and fillers according to the required grading ratio and dry.

2,

press

The thickness of the test die is generally larger than the diameter of the largest mineral particle.

25% principle to choose the appropriate thickness of the test mode

.

3,

The mixing ratio of each component in the sample is based on the ratio of the mineral, filler, additive, emulsified asphalt or modified emulsified asphalt determined by the mixing test.

4,

Weigh

take

Total weight 500g

Mineral material

Put in the mixing pot,

Add the filler, mix well, then add water and mix well, then add emulsified asphalt or modified emulsified asphalt to mix, the mixing time does not exceed

30s ± 2s; then pour the mix into the test mold and quickly scrape. The flattening process should be completed once and cannot be scraped repeatedly. The whole operation should be completed within 45s. The surface of the molded test piece should be uniform, otherwise it should be discarded.

.

5,

Take the test mold, and put the sample into an oven at 60 ° C to dry to constant weight, generally not less than 16h. Remove the sample and cool to room temperature

spare

.

Controller use:

Plug the power plug into the three-phase four-wire socket and turn on the power switch.

The digital display counter is displayed as 1000 working states. If you press the “SET” setting button, the counter will be converted to 100 working states, such as pressing “△” or “

â–½

The “key” can change the count setting value arbitrarily or less. After the set value is determined, press the “Start” button and the host will work.

experiment procedure

1,

Adjust the load wheel tester so that the load quality is

56.7kg

.

2,

will

The sample is correctly mounted on the specimen carrier

.

3,

Keep the experimental temperature at

25 ° C ± 2 ° C

.

4,

Put the rubber wheel down and press it onto the specimen

.

5,

Reset the counter to zero and adjust the rolling frequency to

44 times / min

.

6,

Start rolling

After 1000 times (if there is a sticky phenomenon on the sample during the rolling process or when it is bright, a small amount of water can be sprinkled to prevent the wheel from sticking to the sample), stop, unload, rinse, and dry to constant weight (60 ° C, quite a lot) At 16h), cooled to room temperature and weighed

(m

1

),

Accurate to

0.1g.

7,

Reinstall the sample in the original position of the instrument. Put the sand frame on the sample to the right position, put

300g of 82°C hot sand is poured into the sand frame to flatten (or weigh 200g of 82°C hot sand into the sand frame and flatten the steel cover in the middle of the sand frame), then put the rubber wheel down and start rolling 100 times.

.

8,

Remove the sample, brush the floating sand on the sample with a brush, and then weigh the mass.

(m

2

)

Accurate to

0.1g

.

Calculation

The amount of sand adhered per unit area of ​​the emulsified asphalt slurry seal mixture is calculated according to formula (1).

LWT =

m

2

-

m

1

(1)

A

Where: LMT—Emulsified bitumen sealant mixture adheres to the amount of sand per unit area, g/m

2

;

A—sample load area,

m

2

;

m

1

- the mass of the sample after the first 1000 times of rolling, g;

m

2

- the total mass of the sample and the amount of sand after the second 100 times of rolling, g.

Precautions

1,

After the instrument is used, the power should be turned off in time, and the load wheel should be lifted by the bracket, and then cleaned and maintained.

2,

Check the gearbox for oil shortage every 3-6 months to refuel in time.