The opening and closing member of the plug valve is a perforated cylinder that rotates about an axis perpendicular to the passage to achieve the purpose of opening and closing the passage. Plug valves are primarily used to open and close pipes and equipment media. According to Xingke Hardware Network, the main advantages of the plug valve are: suitable for frequent operation, quick opening and closing, and light. The fluid resistance is small. The utility model has the advantages of simple structure, relatively small volume, light weight and convenient maintenance. The sealing performance is not limited by the installation direction, and the flow direction of the medium can be arbitrary. No vibration, low noise. However, the plug valves used in drilling often have problems that are not easy to open after closing. This paper has carried out a series of discussions and improvements on this issue.
1 Under the three kinds of given loads, the stress under the tensile load is the highest and the safety factor is the smallest. Therefore, the strength conditions under tensile load are the main contradiction.
2 Stretching is calculated by the commonly used plug valve material 40CrMnMo, and the safety factor is 1.71>1.5, which can meet the strength requirement.
3 Under the tensile load, the stress concentration at the orifice of the knob is large, and the yield limit of the material is reached at the stress concentration point. According to the new strength criterion, the maximum value of the stress concentration point is 935.75 MPa<2 MPa, which satisfies the stability condition.
4 The reference stress and stress in the inner groove during stretching are also large, but the strength requirement can be met. Care should be taken to reduce the stress concentration here.
5 Under the given torsion and internal pressure load, the safety factor of each dangerous section is very large, and the strength problem can be ignored.
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Label: Structural Improvement and Strength Calculation of Plug Valves
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Light Emitting Diode F5 In-line
1. Welding prerequisite: (The solder joint must be at least 2mm away from the resin root)
Dip soldering: Please complete the soldering once within 5 seconds at 260°C to prevent the resin from being immersed in the tin bath.
Soldering iron: Use a 30W soldering iron with the tip temperature not higher than 350℃, and the soldering can be completed once within 5 seconds.
Do not apply external force to the product during soldering. Pay attention to prevent the LED pins from being corroded or discolored, otherwise it will cause soldering difficulties. It is recommended to use it as soon as possible.
2. Use attention:
Lead forming must be completed before soldering, and the spacing between the device holes on the circuit board should be consistent with the electrode pins.
If the product is cut under high temperature, it will be defective. Please cut the lead at room temperature.
Before the soldering temperature returns to normal, the LED must be protected from any vibration or external force.
3. Electrostatic protection:
In-line LED
High-brightness blue, green, and white products are sensitive to static electricity. Please be aware that the surge of static electricity will damage or destroy the product. Please use a conductive pad to ground the task table in contact with the product; the tip of the soldering iron must be grounded. To be grounded; it is recommended to use an ion generator.
4. Cleaning:
Special care must be taken when cleaning the gel with chemicals. Some chemicals can damage the surface of the gel and cause discoloration, such as trichloroethylene and acetone. It can be wiped and dipped in ethanol, and the time does not exceed 3 minutes at room temperature.
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