Researching and developing ability for hydraulic cylinder design and manufacturing by HC

HC has the very strong hydraulic cylinder researching and developing ability for hydraulic cylinder design and manufacturing, during the past more than 10 years experience and researching on the hydraulic cylinder, HC has established company standard of design, machining process standard pressure formula. Due to the experience in design, machining and quality controlling, HC hydraulic cylinder has met all kinds of hydraulic cylinder and also have met all kinds of blind area of quality. The followings are describing to HC experience and technologies knowledge for hydraulic cylinders' design, manufacturing and developing.

Due to the hydraulic cylinders moving is directly, it is only for pushing or pulling, there should be one bending or curves surface in the barrel or in the piston rod. For this reason, the standard hydraulic cylinder should be used for pushing and pulling only. No bending moments or side loads should be transmitted to the piston rod or the cylinder. For this reason, the ideal connection of the hydraulic cylinder should be a single ring with a special ball bearing. In this way, the hydraulic cylinder can move without any miss-alignment between the actuator and the loaded components during the pulling or pushing.

Hydraulic Cylinder Designs

There are mainly two styles of hydraulic cylinder designs used:

•  Tie rod type hydraulic cylinders
•  Welded body type hydraulic cylinders

Tie rod type hydraulic cylinders:

Tie rod style hydraulic cylinders use high strength threaded steel rods to hold the two end caps to the cylinder barrel. This method of construction is most often seen in industrial factory applications. Small bore cylinders usually have 4 tie rods, while large bore cylinders may require as many as 16 or 20 tie rods in order to retain the end caps under the tremendous forces produced. Tie rod style cylinders can be completely disassembled for service and repair.

The National Fluid Power Association (NFPA) has standardized the dimensions of hydraulic tie rod cylinders. This enables cylinders from different manufacturers to interchange within the same mountings.

Welded body type hydraulic cylinders:

Welded body cylinders have no tie rods. The barrel is welded directly to the end caps. The ports are welded to the barrel. The front rod gland is usually threaded into or bolted to the cylinder barrel. This allows the piston rod assembly and the rod seals to be removed for service.

Welded body cylinders have a number of advantages over tie rod style cylinders. Welded cylinders have a narrower body and often a shorter overall length enabling them to fit better into the tight confines of machinery. Welded cylinders do not suffer from failure due to tie rod stretch at high pressures and long strokes. The welded design also lends itself to customization. Special features are easily added to the cylinder body. These may include special ports, custom mounts, valve manifolds, and so on.

The smooth outer body of welded cylinders also enables the design of multi-stage telescopic cylinders.

Welded body hydraulic cylinders dominate the mobile hydraulic equipment market such as construction equipment (excavators, bulldozers, and road graders) and material handling equipment (forklift trucks and lift-gates). They are also used in heavy industry such as cranes, oil rigs, and large off-road vehicles in above-ground mining.

Hydraulic Cylinder Trouble Removal

Hydraulic cylinder suppliers pay attention to maintenance also. Hydraulic cylinder trouble removal and hydro cylinder trouble shooting is an important part. Hydraulic cylinder malfunction can solve problems happened in it.

The action of hydraulic cylinder is insensitive and in blocks. This phenomenon is distinct from hydraulic cylinder crawling. It won’t start working upon receipt of the signal, it always stop for a while and then action, or now acting; now stopping. The reasons of this problems and trouble removal are as follows:

1. Too much air in cylinder.

    Removal methods:

a.       Air discharged through vent valve.

b.       Check whether the air intakes from the seals or not. If yes, change the seals.

2. Hydraulic pump revolves irregularly. Such as big vibration noisy, pressure fluctuation seriously, meet a block when the pump rotation, seizure slightly.

  Removal methods can as per relevant books.

3. When a hydraulic cylinder with cushioning device back-to-back starting, the orifice of single valve is too small and make the less of oil in cushion cavity, or vacuum. So it will appear the piston rod stop or reversal phenomenon due to the cushion plunger piston leaves cylinder gland.

   Removal method: enlarge single valve orifice.

4. Single valve‘s steel balls go after the oil flowing when piston rod works fast, it will block the valve orifice and make irregularly action.

   Removal method: as per relevant content.

5. The internal of rubber strips make the valve orifice blocked and result in irregular action.

Removal method: change rubber.

6. Have some transverse load.

Hydraulic Cylinder Removal and protection

HC hydraulic cylinder supplies hydraulic cylinder system, piston rod. In order to know more about the hydraulic cylinder protection, this article will introduce the hydraulic cylinder removal.

HC hydraulic cylinder is a professional production and sale of hydraulic cylinder enterprise, the product quality is high, the price is reasonable. The following share with you the nozzle of hydraulic cylinder removal:

1. Before remove the hydraulic cylinder, should make hydraulic loop discharging pressure. Otherwise, when hose connector loosens which connected to the hydraulic cylinder, circuits of high pressure oil will out quickly. Hydraulic loop when discharging pressure shall first loosen relief valve of the place such as the hand wheel or pressure regulating screws, make the oil pressure unloading, then cut off power supply, make the hydraulic device stop working.

2. When remove the hydraulic cylinder, should prevent the injury for the piston rod top thread, oil hole thread, the surface of piston rod and the inside of cylinder. In order to avoid the in order to prevent the piston rod and slightness piece bending or deformation, place mat wood application in supporting balanced.

3. Remove should in order. Because all sorts of hydraulic cylinder structure and size is not the same, remove the order also differ slightly. Generally should put off oil cylinder of two cavities, oil, then remove the cylinder head, finally remove the piston and the piston rod. When removing the hydraulic cylinder of cylinder head, in key card for connecting card key or card type ring to use the specialized tools, prohibited the use of flat. For flange cover must use screw top out, don’t allow hammering or hard pry. On the piston and the piston rod is difficult to spare, cannot forced hit, should first find out reason to be removed.

4. Unloading before and after discharge should try to create conditions to prevent the hydraulic cylinder part is the dust and impurities pollution around. Such as, remove should as far as possible when in a clean environment, Remove all the parts with plastic cloth after to cover, don’t use cotton cloth or other work covered with a cloth.

5. After hydraulic cylinder removal, Hydraulic cylinder to carefully examine the disassembly to determine what parts can continue to use, can repair what parts of the reoccupy after, what parts must be replaced.