the hydraulic system design

With the development of hydraulic technology, engineering machinery hydraulic drive system has been very common. From a technical point of view, any kind of hydraulic transmission system shall meet the reasonable design, simple structure, easy to use, high efficiency requirements. Hydraulic system will have a direct impact on the performance of the pros and cons of construction machinery, hydraulic steering systems use this article on Troubleshooting common to talk about some of the knowledge and practices. Hydraulic steering system a heavy steering a) if the fast forward or slow rpm steering wheel are heavy and no pressure, oil level may be low, hydraulic hose assembly the oil viscosity is too large or the valve body check valve failure. First check the oil tank and hydraulic oil viscosity, if the oil level is lower than the standard height of adding hydraulic oil, oil viscosity too should be replaced as appropriate viscosity hydraulic oil, such as the viscosity of the oil level should normally decompose steering. If the body of the check valve ball is lost then load the new ball, if the ball stuck in the dirt should be cleaned, if the one-way valve sealing tape poor contact with the ball ball impact of the application, making it reliable sealing. 2) If you turn the steering wheel slowly turn the steering wheel light or fast sink, it may be caused by insufficient fuel supply pump. And the viscosity of the oil level should be checked under the premise of a suitable pump is working properly, or if a small amount of hydraulic oil pressure is low and should be replaced repaired. 3) If the empty load or light load shift light and heavy-duty steering heavy, it may be lower than the pressure relief valve block valve working pressure or relief valve core is dirt stuck or banjo fitting spring failure or damage caused by seals . Should first adjust the working pressure relief valve in the purge relief valve adjustment is ineffective when the decomposition, such as spring failure, damaged seals should be replaced. 4) If the hydraulic cylinder when turning the steering wheel does not move when you move and the issue of irregular sound, it may be the steering system or steering hydraulic cylinder with air leakage caused by too much. Open the tank cap should check whether there is a bubble in the tank, if the first check for leaks at the suction tank, and then check the pipe connections are intact, and the exclusion of air in the system. Such as when the hydraulic cylinder is still not moving when moving piston seal condition should be checked, if necessary, replace the seals.

plastic pipe circulating pressure impact test machine

Plastic pipe circulating pressure impact testing hydraulic adapter fittings, also known as water hammer test machine for testing pipe, fittings or piping system in the case of alternating load fatigue and stress tolerance pulse peak stress. For a variety of hot and cold water piping system with rigid plastic pipes and flexible pipe systems, such as: PP-R, PP-H, PE, PEX and aluminum-plastic composite pipe and other pipes, pipe fittings.
This instrument uses a microcomputer control, LED digital display, a simple, clear display, automatic alarm and other functions, various research institutes, national quality inspection institutions, large pipe manufacturers the necessary testing equipment.
Standard:
Standard GB/T18991, GB/T18992, GB/T18997, ISO10508, ISO15875, ASTM F1281, ASTM F1282, ASTM F1335, etc.
A) pressure cycles per minute, 30 ± 5 times (low voltage 0.1 ± 0.05Mpa, pressure 1.5 ± 0.05Mpa)
2) Timing accuracy: 1s
3) counting error: ± 1 ‰
4) Pressure accuracy: 0.05Mpa
5) the number of cycles set arbitrarily set :0-10000
6) Temperature range: 23 ± 2 ℃
7) Power supply: 380VAC/220VAC mix 50HZ 3k

Assembling card sets of pipe joints

Assembling card sets of pipe joints (a) the most important part of pre-installed ① bite type pipe joint, directly affect the reliability of the seal. Generally require a dedicated preheater. Small diameter joints can be pre-installed on the vise. In practice, as a parent with a connector, the nut, ferrule can be pressed onto the tube. There are straight metric pipe thread joints card sets, card sets - Straight turning heads, bite type tube fittings and other types. It found that even in the same factory shipment, these types of joint body tapered hole depth is often not identical result is a leak, but this issue is often overlooked. The correct approach is the tube end what kind of connector body, connecting terminal corresponding with the same type of connector is pre-installed, so can maximize avoid leakage problems. ② bsp threaded pipe fittings end should be flush. After sawing the pipe should be ground flush on the wheel, and other tools, and deburring, cleaning with high-pressure air blowing before use. When ③ preinstalled, should be kept coaxial tube and connector body, if the tube is too large can cause skew seal failure. ④ preloaded force should not be too much of the inner edge of the ferrule just embedded in the outer wall of the tubes, ferrules should not have significant deformation. When making pipe connections, then the provisions of the tightening force assembly. ф6-1 ferrule tightening force is 64-1 15n, 16фmmr 259n, ф18mm to 450n. If severe deformation during pre-card sets will lose the sealing function

Metric hose fittings for hydraulic pipe connection

hose fittings

Metric hose fittings for hydraulic pipe connection and pressurize treatment of seams, are an integral part of the hydraulic system. hydraulic adaptors part of the night vision system, is a tubular accessories. flat seal metric hydraulic fittings are a different form of american hose fittings , their functions are largely the same, the difference is that they are suitable for different working environment.

Hose fittings in use and design should note the following

Hose fittings in use and design should note the following:
1, hose fittings should avoid contact with the sharp parts and mechanical friction, in order to avoid damage to the pipe.
2, hydraulic hose fitting assembly should be installed to ensure that does not happen torsional deformation. Hose joint axis should be placed in the plane of movement, to avoid each other at both ends of the hose impaired movement.
3, hose connector assembly should take into account the length of hose through the pressure after oil, the length of the shrinkage will occur, usually shrink 3 to 4% of the amount of tube length. So when the hose assembly installation, does not allow a state of tension.
4, the bending radius of hose fittings should not be too small, the connection hose assembly and fittings should have a straight part, this length should not be less than twice the pipe diameter.