Purpose and characteristics 

The GHF1 Double-Acting Single Rod Piston Hydraulic Cylinder Series is the actuating mechanism doing the reciprocating rectilinear movement in the hydraulic system. It is featured with simple structure, high pressure, reliable work, convenient dismantlement, easy repair, cushioning device and diversified connection modes. Therefore, it is widely applied to engineering machinery, mining machinery, lifting and transportation machinery, metallurgical machinery and other machinery.

Technical parameters 

Model description 

Notes:

1. When the rod end is provided with cushioning, K2=30; otherwise, K2=0;

2. Maximum contamination level of oil: as per 19/16 of GB/T14039;

3. Multi-stage hydraulic cylinders with working pressure >36Mpa and cylinder diameter >Φ250mm are to be specially ordered.

Overall, installation and connection dimensions 

Note: K=K1+K2

 I. Service Fluid 

1. It is recommended to use L-HM46 or hydraulic oil with similar viscosity in summer, and L-HM32 or hydraulic oil with similar viscosity in winter;

2. Working oil temperature range -20℃~80℃;

3、 Since the system cleanliness directly affects the reliability of hydraulic elements, before oil filling, the oil tank and pipeline should be cleaned thoroughly; for the oil intake side of general pump, the oil filter with 100-mesh filter fineness (its rated flow should not be less than 3-4 times the pump flow) shall be used, while the return oil pipe shall be provided with an oil filter with the filter fineness no less than 25µm.

 II. Gear Pump 

1. Before oil pump starting, carefully check whether the inlet and outlet ports and revolving direction are as marked by the nameplate and do not rotate it reversely;

2 Flexible coupling is adopted between the pump transmission shaft and prime motor output shaft and its nonaxiality is not more than 0.1mm;

3. The pump spindle should not bear axial force, radial force and bending moment; during installing the gear pump, the spindle should be slowly led in, instead forcibly driven in to cause axial collision, otherwise, serious damage will happen to the pump;

4. The pump oil suction height should not be greater than 0.5m;

5. Collision at the connecting flange of oil inlet port is prohibited; the junction surface and joint must be strictly sealed to prevent air leakage; otherwise, abnormal phenomena such as noise, vibration and foaming will occur to shorten the gear pump life;

6. The diameter of gear pump oil suction pipe should ensure the oil flow rate is less than 1.5m/s.

 III. Multiple Directional Control Valve 

1. Before use, please check whether the nominal pressure, nominal flow rate and slide valve function comply with the hydraulic system requirements.

2. During handling, installation and storage, do not collide and damage the unprotected part of the slide valve.

3. The mounting plate and support should be smooth; and the tightening force of mounting screw should be uniform that should not distort the valve body.

4. While the control mechanism outside the valve is installed, the slide valve should motion flexibly without blocking.

5. When it is installed on the seriously vibrating machinery, vibration reduction measures should be taken.

6. If welding is performed nearby the valve, welding spatters should be prevented not to damage the exposed part of seal and slide valve.

7. The working oil and fluid should be clean and the filter fineness should not be more than 10µm. As per 19/16 of GB/T14039, the oil and fluid viscosity range should be 10~400mm2/S; and the temperature range, -20~80℃.

8. The oil inlet and return oil ports should be installed correctly. High pressure oil shall not enter the return oil port, so as not to damage the valve body. The system pipeline should not be too long and thin to avoid increase the pressure loss, causing system heating.

IV. Hydraulic Cylinder 

1. Viscosity of the working oil for the hydraulic cylinder is 29~74mm2/S, and IS0VG46 anti-wear hydraulic oil is recommended. The working oil temperate is in the range of -20℃+80℃. When the ambient temperature and working temperature are low, the oil with low viscosity may be selected. In case of special requirements, please specify them separately.

2. The hydraulic cylinder requires the filter fineness no less than 80µm. The oil contamination should be controlled strictly to keep it clean. For this purpose, the oil property should be checked on a regular basis, and necessary fine filtration and replacement of new working oil should be carried out.

3. During installation, the connection direction of piston rod top should be consistent with the cylinder head and ring (or central hinged shaft) direction, the straightness of whole piston rod should be ensured during going forward and backward to prevent rigid interference and cause unnecessary damage.

4. After the hydraulic cylinder is mounted onto the main engine, the tubing and guide sleeve should be checked first for oil leakage during test run and oil should be filled in the ring and central hinged shaft bearing.

5. If the hydraulic cylinder is to be removed due to oil leakage, the piston should be moved to any tail end of the cylinder tube by means of hydraulic force; during dismantlement, unsuitable hammering or sudden falling should be avoided as far as possible.

6. Before dismantlement, the overflow valve should be loosened to make the pressure in the hydraulic circuit lower to zero and then the power is cut off to make the hydraulic device stop running; after loosening the oil port tubing, an oil plug should be used to block the oil port.

7. The hydraulic cylinder cannot be used as an earthing electrode so as not to cause any electric injury on the piston rod.