Inspection batch unit for quality inspection and acceptance of mine engineering

(1) The concept of the inspection lot and its significance in the quality control of the project According to the "Consolidated Standard for the Acceptance of Construction Engineering Quality") GB 50300-2013, the inspection lot is put together for inspection according to the same production conditions or according to the prescribed method. a test body consisting of a certain number of samples. Because its quality requirements are basically uniform, it can be used as the basis for inspection. The inspection lot is the smallest unit of engineering acceptance, and is the basis for larger inspection lots and sub-projects, and even the entire construction project quality acceptance. The establishment of inspection batch unit embodies the principle of quality control and timely control. It can detect and deal with quality problems at an early stage and avoid losses caused by quality.
(II) Division of inspection batches “Unified standard for construction quality acceptance of construction projects”) GB 50300→2013 stipulates that each sub-project can be based on the principle of consistent with the construction method and easy to control construction quality, according to work class, structural relationship or construction section It is divided into several inspection lots; or it is divided according to the principles of construction cycle, quality control or professional acceptance in the sub-project.
Construction and acceptance of open-air coal mine ore, nonferrous metals and other provisions of sub-projects can be tested by one or several process batches of components. The regulations stipulate that the inspection lot can be divided according to the actual needs of construction and quality control and acceptance. For example, the grouting reinforcement sub-project in open-pit mine slope treatment can take the construction quality of each grouting hole as the inspection content of an inspection lot.
The inspection and acceptance of coal mine roadway engineering does not have the content of inspection batch, and the smallest acceptance unit is a sub-project.

Brake Pads convert the kinetic energy of the vehicle to thermal energy through friction. Two brake pads are contained in the brake caliper, with their friction surfaces facing the rotor. When the brakes are hydraulically applied, the caliper clamps or squeezes the two pads together onto the spinning rotor to slow and stop the vehicle. When a brake pad heats up due to contact with the rotor, it transfers small amounts of its friction material onto the disc, leaving a dull grey coating on it. The brake pad and disc (both now having the friction material), then "stick" to each other, providing the friction that stops the vehicle.

In disc brakes, there are usually two brake pads per disc rotor. These are held in place and actuated by a caliper affixed to the wheel hub or suspension upright. Racing calipers, however, can utilize up to six pads, with varying frictional properties in a staggered pattern for optimum performance. Depending on the properties of the material, the weight of the vehicle and the speeds it is driven at, disc wear rates may vary. The brake pads must usually be replaced regularly (depending on pad material) to prevent brake fade. Most brake pads are equipped with a method of alerting the driver when this needs to be done. A common technique is manufacturing a small central groove whose eventual disappearance by wear indicates the end of a pad's service life. Other methods include placing a thin strip of soft metal in a groove, such that when exposed (due to wear) the brakes squeal audibly. A soft metal wear tab can also be embedded in the pad material that closes an electric circuit when the brake pad wears thin, lighting a dashboard warning light.

Brake Pads

Brake Pads,Rear Brake Pads,Front Brake Pads,Changing Brake Pads

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