The quality of the lock determines the quality of the security door. Most people do not carefully discern the quality of the lock when purchasing the lock. The lock is of poor quality. In fact, in the purchase process, the unlocking film is an important concern, and his quality determines the quality of the lock.
Pay attention to the following points when choosing a door lock:
1. Compared with the weight of the lock, the heavier the more, the thicker and harder the material of the lock cylinder; on the contrary, the material is thin and easy to damage.
2, watch the surface finish of the lock, whether it is fine and smooth, no spots.
3, try to buy the brand's high-profile locks to ensure quality and durability.
4. Repeatedly open to verify the sensitivity of the lock cylinder spring.
Again, please note that there is an inconspicuous metal unlocking piece in the new lock that you bought. Don't underestimate it. If the key is lost or the lock is faulty, the lock can be easily removed and replaced with the lock piece. The unlocking piece can be removed from the keyless end, the handle removed, and the other end with the key removed, and a new lock can be installed without damaging other parts.
Install the locks and wait until the paint is completely air-dried. Otherwise, the volatiles of the paint and the surface coating of the lock will produce a chemical reaction, which will fade and mottle and affect the visual effect.
Experts say that because consumers are not aware of the importance of door attachments, few people care about it. The author also learned in many decorative companies that only do "half-package" activities. The door locks belong to hardware and are not included in the materials. They are generally purchased by consumers themselves.
Editor in charge: Xu Yuehua
Influence of external factors on the effect of Drinking Water Treatment Agent
1) Effect of pH value of water: Each flocculant has its suitable pH range, and its range will affect the flocculation effect. For example, polyacrylamide, cationic for use in acidic and neutral environments, anionic for use in neutral and alkaline environments, nonionic for use from strong acid to alkaline environments.
2) Effect of temperature: The reaction speed is too slow at low water temperature, the hydrolysis time increases, affecting the amount of water treated, and the excessively high viscosity of the flocculant will also make the floc fine. On the other hand, if the water temperature is too high, the formed floc is fine, the sludge moisture content is increased, and it is difficult to handle. Therefore, too high or too low a water temperature is unfavorable for flocculation. Generally, the water temperature should be controlled at 20-30 °C.
3) Effect of stirring speed and time: The speed is too fast and the time is too long: the solid of the large particles is broken into small particles, and the particles capable of being precipitated are broken into particles which cannot be precipitated. The speed is too slow and the time is too short: the flocculant can not fully contact with the solid particles, which is not conducive to the flocculant trapping the colloidal particles; and the concentration distribution of the flocculant is not uniform, which is not conducive to the role of the flocculant.
Drinking Water Treatment Agent
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Jinan Huijinchuan Chemical Industry Co., Ltd. , https://www.hjcchemical.com