How to identify the spiral guard

The quality of screw guard is mainly identified by the following standards:

1. The surface of the spiral guard on the external surface is smooth and smooth with no missing materials, cracks, damage and burrs;No obvious bubbling and uneven;No impurities, variegated color and other phenomena produced for high quality;On the contrary, it is inferior, unqualified.

2. The hardness of spiral guard with high quality and qualification is generally 85~90 degrees of shao's, and the hardness lower than 85 degrees or higher than 90 degrees does not meet the requirements.Hard too low, can not play the role of internal product protection, binding;The hardness is too high, in the low temperature environment (such as the northeast of China and other cold areas), the guard is prone to brittle, 1%~5% of the product can not meet the use requirements, so that the spiral guard on the internal product protection greatly reduced.

3. High and low temperature resistance high quality qualified spiral guard should have good resistance to high and low temperature performance.Users can be identified by:

Place the spiral case in turn in the condition of 80 ℃ for 1 hour, 0.5 hours at room temperature environment, to 40 ℃ environment for 1 hour, 0.5 hours at room temperature environment, do five consecutive cycles.Observation, if the spiral guard without cracking, stickiness, sag and other phenomena, it is of high quality;Conversely, if spiral guard has one of the phenomena such as craze, be out of shape, hair is sticky or sunken generation, criterion this guard is inferior, unqualified.

4. Excellent oil resistance qualified spiral guard has good oil resistance.The spiral guard can be soaked in the mixture of 70# gasoline and 10% toluene for 5 minutes. If there is no discoloration and stickiness, it is qualified for high quality.Conversely, have become angry, hair stickiness phenomenon, criterion this protective cover is inferior, unqualified.

5. Excellent abrasion resistance qualified spiral guard has good wear resistance.The akron abrasion test can be used as a test.Test results, if the quality difference is less than 0.07 is good;Conversely, if the quality difference is greater than 0.07, then the spiral guard is inferior, unqualified.

6. Tensile strength and impact resistance

High quality spiral guard has good tensile strength and impact resistance.Under normal temperature, the tensile strength is generally 25~30Mpa.The impact strength is commonly: gap, under the normal temperature of 35 kj/M2, and 40 ℃ / 24 h to 5 kj/M, the impact strength (no gap) : continuously.

7. Uv resistance

The spiral guard has better anti - ultraviolet performance.In order to enhance the anti-ultraviolet performance of the black helix guard, carbon black was added.This is also the reason why the black spiral cover has better uv resistance than other colors.

8. Antistatic

Spiral guard is mainly used for excavator, loader, roller paver, forklift, crane, pumping machinery, cable external protection and other construction machinery and injection molding machine equipment.When working in downhole and dry environment, it should be considered to choose screw guard with strong antistatic property.In order to enhance the hydraulic pipe and other internal products antistatic performance, in a variety of harsh environment on the hydraulic pipe to play a better safety protection role!