China hydraulic jack system
The China hydraulic jack is proper for various lifting movements with small lifting height. It is made of an oil chamber, oil pump, oil storage pit, piston crank, oil valve and other main parts.
The standard oil pump will continuously squeeze the oil into the oil cylinder when running as long as the crank handle is moved back and forth.
Due to the constant increase of oil pressure in the oil cylinder, the piston and the heavy objects on the piston will move skyward together when the oil return valve is opened, the high-pressure oil in the cylinder, the device and the serious things on the piston will move upward collectively.
In China hydraulic jack system When the oil rotating valve is opened, the high-pressure oil cylinder flows back to the oil accommodation cavity, and the heavy object and the piston also fall collectively.
when setting the rate of the dual effect hydraulic jack synchronization circuit, the two jacks should remain adjusted to the same opening position before speed improvement
Uncertainties of manual lifting
Although the number of operators in the EU-28 who report carrying or moving large loads has decreased somewhat in recent decades, it is still high at around 32%. In extension, the material lifting from standard lifting in the construction industry has been announced extensively.
What makes manual lifting dangerous?
There are several uncertainty factors that may increase the appearance of injury from manual lifting. These factors are associated with the load's different styles, the task and design of the product, the work conditions, and the worker.
The load, which may be:
- Too large - There is no specific weight limit that is safe.
- too heavy - if the load is large, it is not wise to follow the basic rules for the construction and carrying to keep the container as close to the body as potential; thus, the characters will get tired more quickly; also, the shape or size may obscure the worker's view, thus raising the risk of migrating, tripping or falling
- unpredictable or delicate objects or if the contents can move to make it enjoyable to hold the centre of pressure of the load close to the middle of the body; this drives to uneven loading of muscles and tiredness; moreover, purchases containing liquid can lead to an additional distribution and unexpected movements of the load can make the mechanic lose their balance and reduction
The duty and design of the work, if it wants:
- uncomfortable postures or actions,
- a particular frequency or copy with unfinished recovery times;
- a high rate of production, which the worker cannot control
- unstable loads or charges managed with the body in a threatening position.
Furthermore, the manual approach of heavy loads can cause injuries if the load quickly hits the worker or causes shifting or slipping. Marketing of smaller bags for a long time without a break can result in exhaustion. For a tired person, loads can become too heavy after minutes or an hour of handling, resulting in incorrect movements, and the risk of fractures and diseases will increase.
Dangers of using lifting equipment
The possibilities: associated with the use of lifting equipment in construction are:
- Risks associated with the loads, e.g. grinding due to impact of moving something or loads falling from means because they are not properly sent, or the wrong type of catapults was used
- falling from lifting programs or being crushed when the platform movements
- musculoskeletal dangers associated with forcing exertions reduced working postures and monotonous work
- Communication with hanging electric trains.
Common requirements
All employers have statutory obligations to fulfil to prevent harm to workers. The law is based on the EU directive transferred into a national act. The most important directives concerning lifting services and lifting equipment in development are:
Risk evaluation of lifting operations
Employers are required to assess the health and safety risks that their workers face and overcome them to a satisfactory level. In short, a practical risk assessment should involve the following steps:
- Identify dangers and those at hazard: Think regarding the work that is done and name what may cause or enhance the risk of work-related musculoskeletal dysfunctions. Involve the workers in this process. Concerning lifting operations and lifting equipment, the risk evaluation should centre on the risk factors described earlier. Next, think about everyone who each danger may hurt. This means not just operators, but also entrepreneurs, self-employed persons, and divisions of the public. Specific consideration should be paid to modern and older workers. Finally, consider the causes of the recognised hazards.
- Estimate and prioritize the risks: Estimate the risk for each risk, which means assessing the probability of hurt to occur and how determined some health effects may be. Then, prioritize the risks based on the exhibition, the more possibility and the hardness of the impact.
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