annex 2015 Guangzhou lock product quality supervision and inspection of qualified products and their list of enterprises Serial number Nominal manufacturer product name trademark Type specification Production date/lot number Comprehensive judgment 1 Delai Building Materials Industry (Guangzhou) Co., Ltd. 50# large single tongue anti-insert series handle lock Dray DA-502612K-SN/NP-M 2015-06 qualified 2 Guangzhou Hongli Hardware Products Co., Ltd. Indoor marble mortise lock ML H11K10 steel wire drawing 2015-06 qualified Product purchase and use of common sense In recent years, there are many kinds of door lock products on the market, and the respective functions of the door locks themselves are also very different. According to their main functions, they can be roughly divided into three categories: “ferrule lock†and “spherical door lockâ€. "External door lock" and so on. The mortise door lock is a lock that is inserted into the door sill and its accessories are assembled on the door; its types include: sliding door mortise lock, single tongue mortise lock, single Slant tongue mortise door lock, single slanting tongue button mortise door lock, double tongue mortise door lock, double tongue mortise mortise door lock, etc. As for the spherical door lock, the lock body is inserted into the door. The middle lock, the lock and the insurance mechanism are installed in the handle of the ball handle, and its types include: door lock, room door lock, closet door lock, bathroom door lock, toilet door lock, windproof door lock, etc., and exterior door lock It is a lock that is mounted on the surface of the door, and its types include: single tongue single safety door lock, single tongue double safety door lock, single tongue three safety door lock, double tongue three safety door lock, Double tongue double head three safety door lock, multi-tongue double head three safety door lock, sliding door lock, etc. Therefore, consumers must have a certain understanding of various types of door locks, and according to their own door use requirements and functions to select the corresponding door locks in order to get the desired effect, otherwise they will lose the use value and bring unnecessary losses. In addition, when purchasing a door lock, you should go to a reputable big shopping mall. Only in this way can you have quality assurance. Small knowledge of optional locks: 1. First recognize the product name, site, trademark, model, and implementation standard code. 2. Recognize whether there is a qualified inspection report issued by a professional quality inspection agency. 3, the appearance should be clear, the surface is not rough, feel comfortable, the lock is flexible to open, the locking device should work, the feel can not be invalid, the degree of confidentiality is better. 4. When purchasing, the material should be moderate, the hand feels firm and reliable, and you should not use all kinds of locks made of inferior quality and inferior materials. 5. The parts and components should be compact. Steel box girder and steel and concrete composite box girder are used for large spans, which need to minimize the weight of the bridge, and their excellent high torsional stiffness is particularly useful. The clean lines of the box girder bridge usually have no obvious external hardening. It is generally considered to have excellent appearance and durability, and it has no traps for dust and moisture. Box-shaped cross-sections are sometimes used as compression members, such as in cable support structures or arched towers. Box Girder Formwork,Box Girder Structure,Metro Box Girder Formwork,Bridge Box Girder Formwork Anshan Lijian Engineering Group Co. LTD , https://www.lijianformwork.com
This spot check is based on the national standard GB 21556 "General technical conditions for lock safety" and other standards, such as the mutual opening rate, the length of the tongue extension, the static load of the square tongue, the lateral static load of the tongue, the static tension of the knuckle and the oblique tongue. Projects such as lateral static loads are tested.