Construction Hoist Safety Device
Safety is one of the most important for Construction Hoist, thus the Construction Hoist Safety Device is required. SAJ safety device is a product of BQ. When a cage over-speeds the device should act cut off the power stop the cage on mast gradually. The safety device is adjusted and sealed. Do not disassemble it. The using time limit of safety device are signed on it`s nameplate. Safety device must be delivered to the factory and inspected after it reached to time limit.
Safety device board is the connected part between safety device and other structures, it can take the impact of stopping the cage. There are installed lower speed switch, upper travel limit switch and final limit switch, once the switchs touch the relevant cam the cage will act.
We also supply other spare parts for construction hoist, such as construction hoist Mast Section, Construction Hoist Anchorage Frame, Passenger Hoist Cage, Construction Hoist Overload Protector, Sliding Contact Line, Construction Hoist Motor, Construction Hoist Reducer and so on.
SAJ Safety Device,Passenger Hoist Safety Device,Construction Hoist Overload Protector,Overload Limiter,Anti-fall Device SHEN YANG BAOQUAN BUSINESS CO., LTD , https://www.syconstructionhoist.com
For more than a decade, the statistical data on the production and sales volume of domestic medium trucks has always been inaccurate in terms of accuracy. It can be said to be a mystery. Many of the early mainstream light-card brands such as Dongfeng Dolika, Nanqi Chaojia, Dongfeng Liuqi, Longjiang, and Jianghuai Weilingyuan are all in the category of light trucks, but in recent years they have also been regarded as examples of China Card. Some Type II or Type II semi-chassis are sometimes repeatedly counted into light trucks. Originally, some agricultural vehicle manufacturers such as Beiqi Foton, Kama Motors, Sichuan Nanjun, Shandong Tangjun and other four-wheeled agricultural vehicles have now entered the quasi-medium card sector, but they have not previously been included in the statistics of China Card. Therefore, the production and sales data of China Card has become a chaotic mess. 
At the same time, once this traditional heavy truck company and Shanzhai version of the heavy truck company in order to grab the market, its products have been deferred to the China Card area, but they are not included in the statistics of China Card. Therefore, after careful analysis over the years, it has been found that the production and sales volume of medium-sized trucks has not declined substantially over the years, and the market has not substantially shrunk, but has steadily increased year by year. The industry’s so-called Chinese card shrinkage theory can also be suspended.
In statistics, the statistical agency classifies trucks with a deadweight of 6-14 tons as China Card. However, in fact, the major tonnage products of mainstream and non-mainstream light truck companies already exceed 6 tons. The type of light truck is not a traditional light truck but a standard quasi-medium card. Such as Jiangling wide body light kakawei, it has a container capacity of 33 cubic meters, the maximum load of up to 12 tons. 
Another example is the large-ton small-scale 1.5T Dongfeng Liuzhou Automobile's Dacheng Long, which can pull 20 tons after the actual overload, which is already a heavy truck. In view of the fact that the boundary between the current heavy, medium, light and micro-card products is not clear, the original official statistical method has long been out of line with current social and economic development needs and international standards. Therefore, it is recommended that China's automobile classification standards should adopt the North American statistical classification method for trucks, which is scientific and accurate.
The retail price of medium-sized cards in the market is generally around 200,000 yuan. Its trucks, dump trucks, and special-purpose vehicles cover horsepower in the range of 140PS-220PS. In the past few years, medium-sized trucks have maintained a certain proportion in the truck market, especially the medium and short-distance urban logistics distribution within 500 kilometers and the engineering vehicle market in second- and third-tier cities, which are the main sales areas of China Card. 
According to the spectrum, Zhongka can be subdivided into medium-duty dump trucks and medium-duty trucks. The demand for medium-duty trucks is relatively stable, while the medium-duty dump trucks are robbed by some 25-tonne-load dump trucks in some regional markets. In spite of this, due to the obvious differences in the price of heavy trucks, the use of regional and performance requirements, in recent years, China Card still has a stable demand, especially in the short-to-medium-term logistics on the card market has entered a period of rigid demand.
In recent years, in addition to upgrading almost all light trucks’ products to ultra-long, ultra-wide load capacity enhancing quasi-medium cards, some heavy-duty truck manufacturers have also begun to explore the mid-cap market. First, they are optimistic about the medium-card market and second, they are perfected. Product lineage considerations, as well as the need for bigger and stronger corporate strategies.
From the point of view of products and markets, the traditional China Card can no longer meet the needs of high-speed and heavy-duty trucks, but has also developed toward the quasi-heavy truck products and markets. Therefore, these so-called medium-sized trucks are in fact difficult to distinguish between light, medium, and heavy. Even professionals are unaware of it, not to mention that outsiders in the industry are even more confused.
For example, Dongfeng Liuqi Longxun 609, Qingling FTR, and Futian Ruiwo ADX are quasi heavy trucks. The Longsheng 609 is not only similar in appearance to the Pa Lung 507, but also technically in the same vein. Both of the cabs use a keel frame structure. The interior space is spacious and comfortable, using the same spray technology. Futian Ruiwo two dump trucks have applied heavy truck dump truck technology to China Card. China National Heavy Duty Trucks uses a 2.25-meter-wide body cab from Man TGA and is equipped with a D08 engine to produce the medium-duty truck. 
Jiangling's Kaiwei model has a 6.5-meter length of the car. The length of the entire vehicle is close to 8.5 meters. The length of the outline of the box-type truck has even reached 9 meters. Its specification has already entered the category of China Card. Secondly, Jiangling Kaiwei has obvious strength in the powertrain. Its power is equipped with Chaochao's most advanced 4D engine, which has a displacement of 4.7 liters and a maximum horsepower of 170 horsepower, making it the most advanced domestic medium card.
Another example is the appearance of Jianghuai Wei Ling imitation Japanese Isuzu, the car can take 3 people, the width of the cab is nearly 2 meters, the cab is used before the flip mechanism. Jianghuai Weiling is currently carrying two engines on the market, namely Chaoyang Diesel's 4102 and Xichai's 4110. Zaochai's 4102 engine has a four-valve design, with a maximum horsepower of 110 and an engine displacement of 3.8 liters. Xichadra's 4110 engine has 130 horsepower and a displacement of 4.7 liters. In addition, Jianghuai Wei Ling III super light truck, Cummins ISF3.8 more powerful. Dongfeng Dolika also uses two engines, namely the Chaoyang Diesel 4102 and the Cummins 4-cylinder ISD engine, with a displacement of 4.5 liters and maximum horsepower of 160 horsepower.
In the above-mentioned round of card products, there is a clear feature that the heavy truck products are deferred. China Card took another step towards heavy-duty heavy trucks and took a new step, further enhancing its safety and comfort. However, for this reason, the number of axles of some medium-duty trucks with quasi-heavy trucks has increased. This has also increased the vehicle's weight, but it has not been realized. In summary, we will wait and see where the future products and markets of China Card will develop.