Hydraulic cylinders are moving more and more slowly?

In the actual use process, there will be crawling and local uneven speed, hydraulic shock, working speed gradually decreases or even stops and other failures. Analyze what causes these failures and resolve them.

Hydraulic cylinder, also known as oil cylinder, is a common actuator in the hydraulic system, its function is to convert the pressure energy of the liquid into mechanical energy, so that the moving parts can achieve linear reciprocating motion or swing. The hydraulic cylinder has simple structure, reliable work, easy manufacturing, when doing linear reciprocating motion, the deceleration mechanism is omitted, and there is no transmission clearance, the transmission is stable and the response is fast, so it is widely used in the hydraulic system.

Types and characteristics of hydraulic cylinders.

Hydraulic cylinders can be divided into two categories: single-acting hydraulic cylinders and double-acting hydraulic cylinders according to their mode of action. Single-acting hydraulic cylinders use hydraulic force to push the piston in one direction, while reverse motion is achieved by external force. Double-acting hydraulic cylinders use hydraulic force to push the piston to move in both positive and negative directions, and this form of hydraulic cylinder is the most widely used.

According to its structural characteristics, hydraulic cylinders can be divided into three categories: piston hydraulic cylinders, plunger hydraulic cylinders, and oscillating hydraulic cylinders. In addition to the single use, the hydraulic cylinder can also be combined with several or combined with other mechanisms to complete special functions.

The piston hydraulic cylinder can be divided into two structures: double-rod type and single-rod type, and the fixing method is divided into cylinder block fixation and piston rod fixation.

1) Double-rod piston hydraulic cylinder. Its structural principle is shown in Figure 218, both sides of its piston have extended rods, when the diameter of the two piston rods is the same, the oil supply pressure and flow rate of the two chambers of the cylinder are equal, the movement speed and thrust of the piston (or cylinder block) in both directions are also equal. Therefore, this type of hydraulic cylinder is often used in applications that require the same reciprocating speed and load.

1-piston rod; 2-gland gland; 3-cylinder head: 4-cylinder block; 5-piston; 6- Seal diagram.

1) When the left chamber of the cylinder is pressurized and the right chamber is returned to the oil, the piston automatic table moves to the right: on the contrary, the right chamber is pressurized with oil. When the oil is returned to the left chamber, the piston drives the table to move to the left. The range of motion of the worktable is slightly more than 3 times the effective stroke of the cylinder.

2) The hydraulic oil enters and exits the hydraulic cylinder through the center hole of the hollow piston rod and the radial hole near the piston. When the left chamber of the cylinder is pressed with oil and the right chamber is returned with oil, the cylinder block drives the workbench to move to the left: on the contrary, the right controls the pressure oil, and when the left chamber returns oil, the cylinder block drives the workbench to move to the right.

Its range of motion is slightly more than twice the effective stroke of the cylinder. With the same effective stroke, it occupies less space than the fixed cylinder block.

Maintenance and repair should be carried out to achieve the original speed.

The reasons for the slow movement of the oil cylinder may be: 1), the first fast movement may be because there is no oil in the oil return pipe, there is no back pressure, and when the movement is carried out in the future, there may be back pressure in the oil return pipe, see what factors you have that produce back pressure, such as whether the diameter used by the throttle valve is correct, whether the flow rate adjusted by the throttle valve is too small, whether the valve core of the check valve is blocked, etc.

1. a hydraulic cylinder.

The speed of motion is the ratio of the flow rate of the input cylinder to the effective area of the piston. The speed of the cylinder movement is reduced due to the leakage that reduces the actual flow rate that pushes the piston motion. At this time, the piston should be replaced to ensure a reasonable clearance between the piston and the cylinder barrel.

If the piston seal is damaged, it should be replaced with a new part.

2. The internal leakage of the reversing valve is serious, and the sealing in the reversing valve is guaranteed by the gap between the valve core and the valve hole. Due to various reasons, the gap between the valve core and the valve hole increases, so after the pressure oil from the pump enters the reversing valve, it will flow from the internal annular gap into the low-pressure cavity from the high-pressure cavity, so that the oil flow through the reversing valve is greatly reduced, so that the flow into the hydraulic cylinder is reduced. Therefore, the user needs to replace the reversing valve in a random manner.

Summary. Hello dear, the relief valve connected to the hydraulic line may be clogged or the seal may be damaged. Check the status of the relief valve and confirm it.

There may be residual air in the hydraulic cylinder, which affects the expansion and contraction.

The sealing ring in the hydraulic cylinder is damaged, which affects the seal. If the seal is not good, it is easy to cause liquid channeling in the sealing area of the cylinder, resulting in the lifting pressure can not be reached, and there will be a pause when expanding and contracting.

The hydraulic oil may be defective and not meet the working standards of the hydraulic oil. If the hydraulic oil is not enough, the lifting will be paused. Hope it helps.

When the hydraulic cylinder moves, there will be a pause.

Hello dear, the relief valve that is connected to the hydraulic line may be blocked or the seal may be damaged. Check the status of the relief valve and confirm it. There may be residual air in the hydraulic cylinder cavity bend, which affects the expansion and contraction.

The sealing ring in the hydraulic cylinder is damaged, which affects the seal. If the seal is not good, it is easy to cause liquid channeling in the sealing area of the cylinder, resulting in the lifting pressure can not be reached, and there will be a pause when expanding and contracting. The hydraulic oil may be defective and not meet the working standards of the hydraulic oil.

If the hydraulic oil is not enough, the dust will roll down. Hope it helps.

When the cylinder is retracted, it will automatically rise out.

Hello dear, if the above reasons are not repaired, you need to go to a professional repair shop for system maintenance!

Ask about custom messages].

1.Based on the flow rate of 6mm in diameter.

2.Superimposing a lot of valves will not affect the speed of the first state.

3.The reasons for slow movement may be: 1), the first fast movement speed may be because there is no oil in the return pipe, there is no back pressure, and when you exercise in the future, there may be back pressure in the return pipe, see what factors you have that produce back pressure, such as whether the diameter used by the throttle valve is correct, whether the flow rate of the throttle valve is too small, and the spool of the check valve.

4.If the limb is caused by the flow and pressure of the pump. It is best to re-select, because the flow rate and speed of the general quantitative pump have been specified at the factory, and the change will have an impact on the life of the pump.

1.Based on the flow rate of 6mm in diameter.

2.Stacking a lot of valves does not affect the speed.

3.The reasons for slow movement may be: 1) The first fast movement may be due to the fact that there is no oil in the return pipe, there is no back pressure, and when you exercise in the future, there may be back pressure in the return pipe, see what factors you have that produce back pressure, such as whether the diameter used by the throttle valve is correct, whether the flow rate of the throttle valve is too small, whether the valve core of the check valve is blocked, etc.

2) Whether the sealing ring on the piston is damaged or the installation method is wrong, which causes serious internal leakage of the hydraulic cylinder. 3) The hydraulic cylinder is too large, and the selected valve and pipe diameter are too small to meet the flow requirements. 4) Do you clean the oil suction filter or the return filter?

It may be that the return filter is clogged. 5) Whether the system pressure is measured, whether it is because the system pressure does not meet the requirements, the relief valve can be readjusted.

4.If it is caused by the flow rate and pressure of the pump. It is best to re-sizing, because the flow and speed requirements of the general quantitative pump have been clarified at the factory, and the change will have an impact on the life of the pump.

And if the pressure and flow rate of the pump change, whether the components of the whole system have an impact and whether they can withstand it still needs to be considered.

Hello, the hydraulic cylinder is sluggish and slow, there are several reasons: 1Insufficient hydraulic oil or deterioration, 2. Failure of the booster pump or power take-off leads to insufficient oil quantity.

3. The distribution valve is faulty, resulting in insufficient opening and too slow action of the hydraulic cylinder. 4. The internal leakage of the hydraulic cylinder leads to a large amount of hydraulic oil return, resulting in weakness. Summary.

Hello, happy to answer your questions.

Hello, the hydraulic cylinder is sluggish and slow, there are several reasons: 1Insufficient hydraulic oil or deterioration, 2. Failure of the booster pump or power take-off leads to insufficient oil quantity.

3. The distribution valve is faulty, resulting in insufficient opening and too slow action of the hydraulic cylinder. 4. The internal leakage of the hydraulic cylinder leads to a large amount of hydraulic oil return, resulting in weakness.