This article mainly introduces:

Pakistan hydraulic cylinder,reciprocating cylinder manufacturer,reciprocating cylinder

(Pakistan reciprocating cylinder,produced by Hengyu Hydraulic Cylinder Factory）

reciprocating cylinder are widely used in Pakistan，because of no need for deceleration device，long service life，smooth movement.So our company has designed reciprocating cylinder for customers from Pakistan.

Introduction to reciprocating cylinder:

reciprocating cylinder head explanation: low pressure castings, medium and low pressure with HT300 gray iron, medium and high pressure with 35, 45 steel. When the reciprocating cylinder head itself is the guide sleeve of the piston rod, the reciprocating cylinder head is best cast iron. At the same time, brass, bronze or other wear-resistant materials should be fused on the guide surface. If the guide sleeve is pressed into the reciprocating cylinder head, the guide sleeve shall be wear-resistant cast iron, bronze or brass.

Do not regularly check the damage of the chrome layer of the reciprocating cylinder: completely extend the reciprocating cylinder and carefully check whether there is any surface damage such as injury, strain, welding slag, such as the surface damage position, in the reciprocating cylinder block < 20cm, and the damage depth < 5mm, should be repaired in time to prevent long-term damage to the reciprocating cylinder seal. Welding slag is strictly prohibited on the surface of the reciprocating cylinder.

If the reciprocating cylinder operation failure, you can start from these aspects to troubleshoot: (1) the hydraulic system control pressure is too low. The throttling resistance in the control line may be too large, the flow valve is improperly adjusted, the control pressure is inappropriate, and the pressure source is disturbed. At this time, the control pressure source should be checked to ensure that the pressure is adjusted to the specified value of the system; (2) Air enters the hydraulic system. Mainly because there is a leak in the system. At this time, check the liquid level of the hydraulic tank, the seals and fittings on the oil suction side of the hydraulic pump, and whether the oil suction filter is too dirty. If so, the hydraulic oil should be replenished, seals and fittings should be treated, and the coarse filter element should be cleaned or replaced. (3) The initial action of the reciprocating cylinder is slow. In the case of low temperature, the hydraulic oil viscosity is large, poor flow, resulting in slow reciprocating cylinder action. The improvement method is to replace the hydraulic oil with better viscosity and temperature performance If the reciprocating cylinder is weak and cannot push the load, please check the internal leakage problem. The internal leakage of the reciprocating cylinder includes the leakage caused by excessive wear of the reciprocating cylinder block seal, the piston rod and the seal cover seal and the piston seal. The cause of sealing leakage between the piston rod and the seal cover is that the seal is wrinkled, squeezed, torn, worn, aging, deterioration, deformation, etc., and a new seal should be replaced at this time. The main cause of excessive piston seal wear is improper adjustment of the speed control valve, resulting in excessive back pressure and improper seal installation or hydraulic oil contamination. The second is that foreign bodies enter the assembly and the quality of sealing materials is not good. The result is that the action is slow and weak, and in serious cases, it will cause damage to the piston and reciprocating cylinder, and the phenomenon of "pulling the reciprocating cylinder" appears. The treatment method is to adjust the speed control valve, and the necessary operations should be done according to the installation instructions.

When installing the reciprocating cylinder pipe, the pipe should be cleaned after installation, and should not pass through the reciprocating cylinder block, and the by-pass pipe must be installed in front of the oil port of the reciprocating cylinder block. This is important. Otherwise, the foreign body in the pipeline will enter the reciprocating cylinder, and once it enters, it is difficult to exclude it, but it becomes a foreign body transported to the reciprocating cylinder. Moreover, when cleaning, the removal method of foreign bodies entered in the installation pipeline operation should be considered. In addition, the corrosion in the pipe should be pickling and other procedures before the pipe installation, and the rust must be completely removed.

Answers to some questions about reciprocating cylinder:

What is a differential cylinder?
The differential cylinder is by connecting the return oil of the rod cavity through the pipeline, allowing them to flow into the rodless cavity, thereby speeding up the extension speed of the piston rod. In fact, the cylinder is still the cylinder, but the oil circuit is related to the connection. The oil connection mode in which both chambers of a single rod hydraulic cylinder are fed hydraulic oil is called differential connection.

Servo cylinder control principle
The electro-hydraulic pulse servo cylinder is composed of a stepper motor, a three-position four-way servo valve, a mechanical feedback device (a wire carrier) and an oil lever. When the stepper motor gets a pulse signal, its output shaft rotates 1.5 or 3 degrees, the servo valve spool drives the wire to rotate at the same time, the valve spool moves and opens the reversing cylinder to output pressure oil, the piston moves and drives the lead screw to reverse rotate the valve spool back to the original position, and the servo valve stops output pressure oil in the center. At this time, the cylinder moves 0.1 or 0.2mm stroke, and the displacement and speed of the cylinder travel are determined according to the given value of the electrical pulse.