Open channel flowmeter is a kind of commonly used flow measurement instrument, which adopts advanced flow velocity measuring instrument and water level measuring instrument to ensure the accuracy of speed measurement and calculation. It is a new intelligent flow system.
Open channel flow meter selection
1. Accuracy grade and function Select the instrument accuracy grade according to the measurement requirements and the use occasion, so as to achieve economical cost. For applications such as trade settlement, product handover, and energy metering, higher accuracy levels, such as 1.0, 0.5, or higher, should be selected. For process control applications, different accuracy levels are selected based on control requirements; some Is to detect the process flow, without the need for precise control and measurement occasions, you can choose a slightly lower accuracy level, such as 1.5, 2.5, or even 4.0, then you can use low-cost plug-in open channel flowmeter.
2. Measure the medium flow rate, instrument range and bore diameter to measure the general medium. The full flow rate of the open channel flow meter can be selected within the range of 0.5 to 12 m/s for measuring the medium flow rate. The range is wide. The instrument specification (caliber) is not necessarily the same as the process piping. The measurement flow range should be determined within the flow rate range. That is, when the flow rate of the pipeline is too low to satisfy the requirements of the flow meter or the measurement accuracy at this flow rate is not guaranteed, It is necessary to reduce the diameter of the instrument to increase the flow rate in the tube and obtain satisfactory measurement results.
3, fluid characteristics mainly refers to the gas pressure, temperature, density, viscosity, compressibility, etc., because the gas volume changes with temperature, pressure, should consider whether to compensate for the amendment.
4, instrument performance refers to the instrument's accuracy, repeatability, linearity, range ratio, pressure loss, initial flow, output signal and response time, select the flow meter should be carefully analyzed and compared to the above indicators, select to meet the measurement medium flow Required instrument.
5. Installation conditions refer to the direction of gas flow, the direction of the pipeline, the length of upstream and downstream straight pipelines, pipe diameter, space location, and pipe fittings, which will affect the accurate operation, maintenance and service life of gas gas flow meters.
6. Economic factors refer to purchase fees, installation fees, maintenance fees, calibration fees and spare parts, which are affected by the performance, reliability, and longevity of the gas gas flowmeter.
Vertical Lathe
A lathe is used to fashion a rotating piece of raw metal, wood, or composite into a precise configuration using movable cutting tools, or bits set to varying depths. The process, known as turning, or machining, is most often accomplished with a horizontal lathe. Often, however, space or material constraints, sometimes even personal preferences, necessitate the use of a vertical lathe.
Essentially a horizontal lathe turned on end, a vertical lathe, also called a boring tool, is composed of basically the same parts as a horizontal lathe. As implied, the functions of vertical lathes are performed up and down, rather than side to side, as is the case with horizontal lathes. This vertical alignment allows short, heavy, bulky materials to be machined more efficiently than with a horizontal lathe.
All lathes, vertical or horizontal, are comprised of the same basic parts. The headstock encloses the spindle and chuck, the parts that actually turn the material. The bed catches the shavings, and also serves as a brace for the horizontal lathe. The feedscrew and leadscrew, mounted on the lathe carriage, adjust the speed and distance traveled by the cutters along the stock. The cross slide and compound rest position the toolbox, which, in turn, mounts the bits.
The tailpost, at the opposite end of the lathe spindle, clutches the stock and braces it, thus eliminating wobble and vibration. The headstock and tailpost may be at the upper or lower end of a vertical lathe, or to the right or left end of a horizontal lathe. Either way, the headstock is one end of the lathe, the tailstock, the other.
Vertical lathes may be vertical turret lathes (VTL), where a turret holds various toolboxes, allowing little wasted time resetting bits during the machining process. There are also computer numerical control (CNC) vertical lathes in which the entire machining process is computer operated.
The top of the lathe pyramid are the CNC vertical turret lathe machines, most often used to turn stainless steel into precision parts for engines, turbines, transmissions, etc. These machines, though expensive to purchase and operate, are perfectly suited to the task, saving space, as well as over-stressed equipment. A CNC VTL can also be used on alloys to efficiently turn precision bearings and gears.
A vertical lathe can used on rough wood in a home workshop, mainly for its space-saving attribute. Many home hobbyists, however, simply feel more comfortable turning wood up and down, rather than side to side. Altogether, the vertical lathe is a very capable and versatile tool.
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