Modern office chair MODEL-6

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Modern office chair MODEL-6

Q:What are tensile and shrink wrapping?: Shrink wrap (shrink wrap) is the use of shrink film wrapped items (or inner package), and then the film proper heating treatment, so that the film shrink and cling to the goods (or inner package) packaging technology. Shrink film is a specially stretching and cooling treatment of polyethylene film, because the film residual tensile stress in the directional contraction, the stress is heat will be eliminated, so that the horizontal and vertical were sharp contraction, while the film thickness increases, the shrinkage rate is usually 30% to 70%. The contraction force reaches the maximum value at the cooling stage, and can keep for a long time.

Q:Mechanical structure and principle of automatic focusing lens for camera: From the basic principle, AF can be divided into two categories: one is based on the camera and photographed location AF target distance between measurement and another is based on the focus screen clear focus imaging detection.

Q:The working principle of the bolt tensioner: Bolt hydraulic stretcher or bolt tension, it uses hydraulic booster pump (ultra high pressure hydraulic pump) source, according to the tensile strength, yield tensile and elongation coefficient determined, using ultra high pressure pump the stretch, the bolt is applied force in the elastic deformation zone is stretched, the diameter of the bolt a slight deformation, so that the nut is easy to loose, and it can be used as a hydraulic interference connection device of applied axial force, top pressure installation. The biggest advantages of stretcher can make a plurality of bolts and fixed value fastening and disassembly, uniform force distribution, is a safe, efficient and fast tool is the best way to bolt fastening and disassembly of various specifications. Used in petrochemical, nuclear power, wind power, hydropower, thermal power, ships, railways, aerospace, mining, heavy machinery and other fields. According to different working conditions, application conditions and user requirements, it can be used as a special stretcher design.

Q:Mechanical principle of belt expansion machine: Principle: the telescopic belt conveyor adds a telescopic mechanism to the ordinary belt conveyor, so that the belt conveyor can be freely extended in the length direction.

Q:Is the construction of the water supply steel pipe a telescopic device?: The trench excavation method should be carried out before the investigation and study, fully understand the channel section of the soil, underground water, underground structures, underground trench near building and construction environment, find the problem timely contact with the construction unit, research on treatment measures. In order to prevent over excavation, the groove should be laid out before excavation, and the excavated layer shall be excavated at intervals according to the opening slope, and the excavation depth shall be measured at any time.

Q:What is a bolt tensioner? How do you use it?: Ensure the load is required in the standard setting, screwing length of screw thread is also provided; ensure the load refers to the mechanical test project of bolts and nuts, the threaded part is load bearing ability (because the threaded portion of the most vulnerable).

Q:How to achieve telescopic power arm: Pneumatic, cylinder. There is an electromagnetic valve, an air compressor.

Q:What is the automatic telescopic function of an automatic umbrella?: The most important thing about the design of a fully automatic long handled umbrella is the choice of the elastic potential energy device between the upper and lower springs. The traditional semi automatic long handle umbrella pushes the slide block upwards through the pretightening force between the springs between the two sliders so as to realize the opening of the long handle umbrella. Therefore, it is proved by experiments that if a spring is added to the slider, and whether the slider can move downward similarly, the experiment shows that the umbrella can be closed. Then, the following work is how to determine the size difference and working state of the two spring preload.

Q:What are the main uses of a bolt tensioner?: But the general does not hurt the threaded bolt tensioner, high precision, high tensile bolt General requirements is the most appropriate, domestic stretcher good brand, I recommend Prima, quality customer service is good, and I hope to help you!

Q:How do you pull the contracted muscles with a mechanical device?: Common causes of muscle spasms: fatigue: when the body is tired, the normal physiological functions of the muscles change, and at this point, the muscles will have a lot of lactic acid accumulation, and constantly stimulate muscle spasm. Electrolyte imbalance: a large amount of sweat during exercise and a large amount of electrolyte loss. The main components of sweat are water and salt, and losing too much salt can cause muscle tension and cramping. Cold stimulation: in cold climates, such as swimming, it is stimulated by cold water, especially when the preparation is inadequate, and muscles tend to spasm. How to do it: when a muscle spasm occurs, it usually relieves the spasm by pulling the spastic muscles in the opposite direction. Attention should be paid to keeping warm during the process. When pulling, the force should be uniform, and the violence should not be avoided, so as to avoid muscle strain. Abdominal muscle spasm, you can do the back stretch to lengthen the abdominal muscles, you can also abdominal hot compress and massage. When the calf muscle spasm, can unbend the knee joint, brings back the toe, simultaneously holds the foot with both hands, forcibly upward draws.

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