1, type selection
According to the working requirements and conditions, choose the type of cylinder correctly. Request cylinder arrives at a stroke without terminal impact phenomenon and the impact noise should choose a buffer cylinder; light weight, light should require the installation of cylinder; space narrow and short stroke, optional thin cylinder; horizontal load, optional cylinder with rod; braking requirements of high precision, should lock cylinder; do not allow the piston rod rotation, optional a rod is not rotational cylinder; high temperature environment need to use heat-resistant cylinder; in a corrosive environment, selection of corrosion resistant cylinder. In the harsh environment such as dust, it is necessary to install the dust cover at the piston rod protruding end. When no pollution is required, no oil or oil free lubrication cylinder is required.
2, installation form
According to the installation location, purpose and other factors to decide. In general, a fixed cylinder is adopted. The rotary cylinder should be used when rotating continuously with the working mechanism (such as lathe, grinding machine, etc.). When the piston rod is required to move in a straight line, the shaft pin type cylinder is also used. Special cylinders should be selected when special requirements are required.
3, the magnitude of the force
That is the choice of bore. According to the magnitude of the load force to determine the thrust and tension of the cylinder output. In general, according to the external load theory, the cylinder force required by the balance conditions, according to different speed, choose different load rate, so that the output force of the cylinder is slightly margin. The bore is too small, the output power is not enough, but the diameter is too large, the heavy equipment, cost increase, and increase consumption, waste of energy. In the fixture design, the expansion mechanism should be used as far as possible, in order to reduce the size of the cylinder.
4, piston stroke
With the use of the situation and the mechanism of travel related, but generally do not choose full stroke, to prevent the piston and cylinder head collide. As for the clamping mechanism, should be required to calculate travel increased 10 ~ 20 mm margin.
5, piston movement speed
Mainly depends on the cylinder input compressed air flow, the size of the cylinder intake and exhaust port and the size of the catheter bore. High value should be taken for high speed motion. The cylinder speed is 50 to 800 mm /s. For the high speed moving cylinder, the intake pipe with large inner diameter should be selected; when the load is changed, in order to obtain the slow and stable speed of movement, the throttle device or the gas liquid damping cylinder can be used, and the speed control is easy to realize. The throttle valve control cylinder speed should pay attention to: cylinder installed horizontally pushes the load, as recommended by the exhaust throttle speed control; load lifting cylinder installed vertically, recommended intake throttle control requirements; at the end of stroke smooth movement to avoid impact, should choose the cylinder buffer device.
Type selection of cylinder
Program 1: select cylinder type according to operation form:
There are three ways to operate the cylinder: double action, single action spring press in and single action spring extrusion
Program 2: select other parameters:
1, the selected cylinder size according to the load, using air pressure and direction determine
2, selected cylinder stroke, moving distance of workpiece
3 、 selected cylinder series
4, the selected cylinder installation type has different installation methods, mainly basic type, foot seat type, flange type, U type hook, shaft ear type
5, select buffer no buffer, rubber buffer, gas buffer, hydraulic shock absorber
6, the magnetic induction switch is mainly used for position detection, requiring the cylinder built-in magnetic ring
7, select cylinder fittings including related joints
Installation of cylinder:
According to the installation form of the installation piece of cylinder, it can be divided into removable and fixed cylinder. According to the installation forms of the cylinder, it can be divided into four types: fixed type, swing type, embedded type and rotary cylinder.
(1) before the cylinder is installed, it should be tested by no-load test and under 1.5 times maximum working pressure. After running normally and no leakage phenomenon, it can be used.
(2) before the cylinder is connected to the pipeline, the stolen goods in the pipeline must be clear to prevent sundries from entering the cylinder.
(3) when the load varies in the stroke, the cylinder with enough output force should be used, and the buffer device is added.
(4) before the start of the buffer cylinder, the buffer throttle valve in the throttle two smaller position, and then gradually opened, until transferred to no, satisfactory buffer effect
(5) do not use the full stroke, especially when the piston rod, piston rod and cylinder to be used together. Otherwise, it is easy to cause the load concentration of the piston rod and the external connection.
The installation form of cylinder should be determined according to the installation position and the purpose of use. In general, a fixed cylinder is adopted. The rotary cylinder should be used when rotating continuously with the working mechanism (such as lathe, grinding machine, etc.). Special cylinders should be selected when special requirements are required