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Modern office chair

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: Is the construction of the water supply steel pipe a telescopic device?: When building management personnel to operate, strict inspection, selection of qualified brick factory with the same specification, on the masonry staggered, a brick, mortar and uniform horizontal mortar joint concave mortar, should take 5--8cm, wells and vertical mortar joint width not less than 5mm, while laying on the edge of a mud brick rub a squeeze, the slit into pulp, necking, measuring layers with a ruler, each layer in size, surrounded by flavours of not more than 3cm, three flavours of not more than 4cm, to ensure the quality.

Q: What is a limiter?: The compensator of the inner sleeve shall be noted that the direction of the inner sleeve is consistent with the direction of the medium flow, and the hinge rotation plane of the hinge type compensator shall be in accordance with the displacement rotation plane.

Q: How to achieve telescopic power arm: Consider synchronous motor, screw drive, photoelectric induction limit, PLC connection drive control displacement

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: 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: 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 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.

Q: What is the automatic telescopic function of an automatic umbrella?: Working process and principle analysisA. the long handled umbrella is in a tight position, that is, the middle slide is at the lower dead point1. the elasticity of the spring 1 at the moment reaches its minimum value and is greater than 0.The 2. middle slider is at the lower dead center and is locked by the bump switch 1.On the 3 of the 3. rib buckle at the fulcrum of the slider 2, a spring 2 stretch for 0.The B. long handle umbrella is at the beginning of the opening, i.e., the middle slider begins to move up

Q: What are the main uses of a bolt tensioner?: Stretch, fasten, or loosen the bolt and think of the bolt as a rubber band. It is flexible and can be stretched freely within its range of elastic deformation

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