The connection of high-strength bolts is divided into a pressure-type connection and a friction type connection. If the pressure-type connection does not bear the tensile force, the bolt can be screwed to the normal close state without applying pre-stress. The damage that can occur in the pressure-type connection is the same as that of the ordinary bolt connection, so the calculation content is the same, and the difference is the value of the shear strength and tensile strength related to the bolt material. Friction type connections are used to cause damage to normal use in the event of slippage, such as joints subjected to fatigue damage, and connections with repeated forces do not exist. In addition to the calculation of the slip, the friction type connection should be calculated according to the pressure type connection.
The calculation method specified by the specification is sometimes related to the type of bolt hole. The classification of the hole is shown in Figure 1.a-standard hole; b-expanded hole; c-short slot hole; d-long slot hole Figure 1 Bolt hole type (by diameter 20mm bolt as an example) 3 ordinary bolt connection calculation 311 ordinary bolt connection only bears tensile force 1 or shear force of a bolt tensile or shear bearing capacity The distance from the edge of the hole in the direction of the force to the edge of the adjacent hole or the distance to the edge of the connecting member; t is the thickness of the connecting piece; Fu is the minimum tensile strength of the connecting member; d is the nominal diameter of the bolt. For the connection, the total pressure resistance is the sum of the pressure values ​​of the individual bolts. Both the friction type and the pressure type connection are subjected to the calculation of the bearing strength. The enlarged holes and the short and long slots are used and the force is parallel to the direction of the slots, and the friction type connection is used. The two steel plates are bolted together, as shown in Figure 2, using M22, A325 high-strength bolts, which are standard holes, friction-type connections, and threads at the shear plane. The steel plate contact surface treatment is Class A. The design considers the deformation around the bolt holes. Find the bearing capacity Pu of the connection. Figure 2 is a simplified diagram of the calculation of the example: look up the table, A325 bolt, thread at the shear plane, shear strength F; when the diameter is 22mm, the standard hole diameter is 24mm, the ultimate strength of the pre-tensioned steel.
Advantages of LED Grow Light for weed.
- Energy saving. LED grow lamp is efficient light only consume less energy put output powerful light. Environment friendly and saving bill.
- Long lifespam. LED is durable and with long life 50,000 hours. Which also ensure you lower maintenance cost. Traditional HPS MH grow lights is very easy to fail and almost need to change each year.
- Better for plants growth. LED grow lights are usually with full spectrum, Plants can use nearly all the light emitted from led grow lights. But usually only 35% of light generated by MH HPS is useful for plants growth.
- Low heat output. LED grow lights produce very little heat, and they usually with fans or efficient dissipation heat sink. Ensure better growing environment to plants. Traditional lights usually delivery lots of heat. It's very hard for plants especially in summer.
Available weed grow lights.
C Series led Grow Light : cob 600w 1200w 2000w 3000W LED Grow Light, with advanced cob technology, focusing lighting, ensure high ppfd. And this series led grow lights are with veg bloom switches, you could change spectrum from seeding to flowering. And they are daisy chained. easy to use and install.
G series led grow light: G110w G220w led grow light. This series led grow lights are with compact shape, suitable for small space. But they are powerful with samsung leds and reflector. and it's waterproof.
K series led grow light: K1000 K2000 K4000 led grow light, with dimmer. Freely to adjust lighting intensity according plants needs. when seedling, turn dowm it, when flowering, turn up. And down at night, up at noon. Very convenient. The K4000 with a specially design, it can be fold up. easy to carry and install.
L series led grow light: 700w led grow light is a decent light, foldable and dimmable and you could add controller. 700w powerful led grow light is great for weed. PPE 2.8-3.0 μmol/J. Spider grow light design can delivery uniform light, great for weed growing.
M series led grow light: 240w 320w 400w 600W LED Grow Light. This series led grow light is like L700 with dimmer and foldable. They also with spider design. but it with external driver. So you could put driver out of tent, ensure lower heat and easy to control.
If you want to see more, please contact us for details.
Weed LED Grow Light, Herb Grow Light, Grow Light for Seed Starting, Seedling Grow Light, Grow Light for Seedlings
Shenzhen Ameri Technology Co., Ltd. , https://www.aglexz.com