1、 What is the stroke of the cylinder?

Hydraulic cylinder It is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion).

It is simple in structure and reliable in operation. When it is used to realize reciprocating movement, the reducer can be avoided,

There is no transmission clearance, and the movement is smooth. Therefore, in various mechanical Hydraulic system It is widely used in.

Hydraulic cylinder The stroke refers to the action length of the piston rod, that is, the reciprocating motion of the piston to The distance between the far point and the near point.

In short, the stroke from the bottom of the hydraulic cylinder to the full extension is the stroke of the hydraulic cylinder.

For the hydraulic cylinder with buffer device, the stroke of the cylinder also includes the buffer length.

2、 Relationship between design stroke and working stroke of hydraulic cylinder

Determine the stroke S according to the requirements of the overall design of the equipment or device system,

If the selection space of the oil cylinder allows, please select the oil cylinder whose stroke is longer than the actual required stroke to improve the expandability of the system and prevent the excessive elongation of the oil cylinder.

The design stroke of the oil cylinder is greater than or equal to the working stroke of the oil cylinder (generally greater than a few centimeters of the working stroke).

3、 Specific determination principle of trip S

1. Stroke S=Actual to Large working stroke Smax+stroke margin △ S;

2. Travel margin △ S=travel margin △ S1+travel margin △ S2+travel margin △ S3.

3. Determination principle of stroke margin △ S Under general conditions, comprehensive consideration shall be given to: the stroke margin △ S1

4. The stroke margin △ S2 that may be required at the beginning of the stroke and the stroke margin △ S3 that may be required at the end of the stroke during the actual operation of the hydraulic cylinder.

5. When the hydraulic cylinder has the requirement of buffer function, the stroke margin △ S will have a direct impact on the buffer function. It is recommended to reduce the stroke margin △ S as much as possible.

6. For hydraulic cylinders with long stroke or special working conditions, check the stability of hydraulic cylinders according to their specific working conditions (load characteristics, installation methods, etc.).

7. For ultra short stroke (exceeding the allowable value of some installation methods of each series of hydraulic samples to If necessary, please confirm with the manufacturer.  

8. The oil cylinder is an integral part of the whole mechanical equipment. The stroke of the oil cylinder must meet the corresponding equipment action requirements to Large travel must be a priority.

9. After determining the stroke, determine the type of cylinder to Small installation size and to Large travel is directly related,

10. Because the piston thickness, cylinder bottom thickness and guide sleeve thickness are relatively fixed, to Small size directly depends on to Large travel.

11. If to If the small size is still greater than the limit value of the installation position, multi-stage oil cylinder can be selected.

give an example:

When you choose the installation method of 63 cylinder diameter front and rear single ears, the installation hole distance of HSG front and rear single ears should be 305+S. If the design stroke is 600, the installation hole distance is 905mm.

If a two-stage oil cylinder is used, if the design stroke is 600, the installation hole spacing is 625mm, which can greatly save installation space.

However, if you want to achieve the same thrust as the single-stage cylinder, the outer diameter of the second stage cylinder is much larger.

4、 How to select the stroke of double rod cylinder?

If the cylinder body is fixed and the piston rod is connected with the workbench, the reciprocating motion range of the hydraulic cylinder is three times of its effective stroke.

If the piston rod is fixed and the cylinder block is connected to the workbench, the movement range is twice the effective stroke.

5、 What accuracy Control cylinder stroke?

1. Is there a standard for determining the itinerary?  

Some standard cylinders will be mass produced by the manufacturer, and the standard stroke is mostly 50 mm, such as 50, 100, 150, 250, 300, etc.

For standard cylinders, if the stroke needs to be customized, such as 55mm,

The manufacturer's production cost includes the production of new product code, BOM list, cylinder cylinder and piston rod to be reworked, and the assembly and testing of the whole cylinder.

Although the material costs are basically the same, the production costs and management costs have increased significantly, so the large-scale manufacturers are unwilling to accept such orders.

For non-standard cylinders, stroke 55 or 50 is basically the same for materials and production costs.

2. When the design stroke of the oil cylinder is 505, but you want the stroke to reach 500, the piston rod of the oil cylinder will stop. At this time, there are three ways to achieve:

Method 1:

The use of fixed backers for accurate positioning is also called mechanical positioning method.

Method 2:

Use electronic displacement device. For example, the magnetic induction oil cylinder, the main function of the magnetic switch is to check the operation of the oil cylinder piston.

When the magnetic ring of the oil cylinder moves slowly close to the magnetic induction switch, the magnetic reed of the magnetic switch will be induced, so that the electric shock is closed and a signal is generated;

Magnetic induction oil cylinder: When the magnetic ring of the oil cylinder leaves the area of the induction switch, the magnetic reed will lose its induced magnetism, so that the electric shock will be disconnected and no signal will be generated,

In this way, the position movement of the cylinder piston can be checked to control the action of the corresponding solenoid valve.

Method 3:

At the proximity switch, add solenoid valve control. Add travel switch. When touching the oil cylinder switch, the solenoid valve will reverse.