The assortments of hydraulic cylinder

July 7th, 2011 by hc4 No comments »

The assortments of hydraulic cylinder

    Hydraulic cylinder is a machine that can transform the hydraulic energy into linear motion mechanical work.

    According to the version of hydraulic cylinder, the assortments of hydraulic cylinder can be divided into four types:

  1. Piston type: single piston rod hydraulic cylinder only has a piston rod in one end. Both ends of oil ports A and B can not only come in but also come out pressure oil or return oil in order to effect bidirectional movements. It is also called double acting cylinder.
  2. Plunger type:

           (1). The plunger type of hydraulic cylinder is a single function type hydraulic cylinder. The direction of movement is depending on hydraulic pressure,  and  the return of plunger piston must rely on external forces or piston’s dead-weight;

           (2).The cylinder sleeve support but not get in touch with plunger piston, so process this cylinder sleeve is very easy, and will be suitable for making long trip hydraulic cylinder;

           (3).The plunger type of hydraulic cylinder should be strong enough to endure pressure;

           (4).the weight of plunger piston is always heavy, it will droop due to self-weight when you level placed, lead to sealing elements and guild sleeve uneven wear, so it is good for us to vertical placement.

   3. Telescopic type: the telescopic type of hydraulic cylinder has two or multilevel pistons, because the telescoping cylinder can achieve long trip, and he return trip is shorter, the structures are compact. So this kind of hydraulic cylinder is often used in engineering machinery and agricultural machinery.

   4. Swing type: swing type of hydraulic cylinder is a machine that can output torque and realize shuttling; it is also called oscillatory motor. The stator block is fixed in cylinder body, and the blade connects with rotor. According to the direction of oil-taking, blade will bring the rotor swing repeatedly.

written by: Candy  from hydraulic cylinder

Skype: anoe-04



Hydraulic cylinders working principle| Hydraulic cylinders operating principle

July 6th, 2011 by hc4 No comments »

Hydraulic cylinders working principle

  The basis of hydraulic cylinder’s parts are: 1. Cylinder barrel and cylinder cover 2.Piston and piston rod 3.Sealing arrangement 4. Absorber5. Exhaust plant.

  Every hydraulic cylinders working principle are almost the same. Just like hand jack, it is the simplest hydraulic cylinder. Make the hydraulic oil across the non-return valve to Hydraulic cylinder via manual pump hydraulic. And then, because of the manual pump hydraulic, the oil cannot regress, push the cylinder rod up, the oil enters into the hydraulic cylinder constantly. If you want to make the cylinder rod fall down, open the hydraulic valve and the oil will return back to the fuel tank. This is the simplest hydraulic cylinder working principle. Other hydraulic cylinders working principle are on the basis of the improvement.

written by: Candy from hydraulic cylinder 

Sky: anole-04



Hydraulic cylinder painting process ————— Pre-treatment

July 2nd, 2011 by hc2 No comments »

Hydraulic cylinder painting process ————— Pre-treatment


Pieces of the workpiece



Washed 1

Washed 2


Washed 3

Wash with hot water



Spray primer

Primer leveling

Spray topcoats

Topcoats leveling

Baking curing



Qualified packaging

Product storage(repair failed back)

Spraying instructions

As more high-end spray cylinder coating process surface means, the whole process is extremely stringent quality requirements. The entire surface treatment process, including pretreatment, coating curing are subject to strict quality control to ensure the quality of hydraulic cylinder coating.

The use a multi – cylinder spray coating process in order to give full play to paint durability, weather ability and good benefits. Spraying equipment must ensure that there is excellent atomization, to ensure uniformity of coating, coating the metal particles directly affect the distribution of the coating appearance. Uniform, excellent quality of the coating with a metallic luster, bright colors, use of inappropriate spray coating equipment, will produce uneven color, surface coating is not the shadow of the old ills or.


Pre-treatment is basis for painting, is an important and indispensable process is to improve the hydraulic cylinder coating adhesion, corrosion resistance of the key, and thus the quality of pre-treatment level of coating quality is directly related to the merits of cylinder. Pre-treatment on the one hand to improve anti-rust anti-corrosion coating performance, extend the life of the coating, the other to improve the adhesion of the coating on the cylinder, but also to obtain a uniform coating.

Pre-treatment includes the following three aspects:

(1)  Remove all dirt from the cylinder surface. Such as degreasing (or skim), rust coating to ensure the physical and chemical properties and quality of the product. Common dirt are: metal corrosion products (such as rust, Oxide), dust, oil, etc.

(2)  After cleaning the surface of the hydraulic cylinder of a variety of chemical treatments to coating corrosion resistance and coating adhesion with the surface. Such as hydraulic cylinder for phosphating, etc.

(3)  Made to eliminate the hydraulic cylinder by mechanical machining defects, adjusting cylinder surface roughness to improve product quality and appearance of adhesion.

According to its own characteristics cylinder, using the pretreatment trough and spray the joint structure of the continuous process of work piece processing. Chamber body for the closed structure, which consists of cleaning fluid spray jet tubes, nozzles, angle adjustable, easy removal. Phosphate in the physical segment ends and the upper part of glass fiber reinforced plastic fan, and timely discharge of water vapor generated during spraying to prevent spillover into the workshop to improve the working environment workshop.

Hydraulic Cylinder Repair

June 29th, 2011 by hc2 1 comment »

Hydraulic Cylinder Repair

Hydraulic cylinder and the piston would often pull or wear problems, the plunger or cylinder replacement cost, and therefore the repair methods are generally used. The plating or plating is the most common method. Maximize the use of plating repair, but also to pay attention to the following question:

  1. Certainly needs a good clean surface plating, the plating layer to be worn away the original, or because of the different materials before and after the coating peeling off caused by.
  2. Re-plating the entire work surface is the best, so you can ensure consistent coating to reduce coating spalling occurs.
  3. Before plating on the first pull or repair worn parts, the small size of the strain traces can be used to braze repair.
  4. Must be polished after plating on the grinder, after polishing.
  5. After processing must ensure roundness and size.
  6. Polished to ensure that the diameter tolerance, within the general requirements o.


Plating or plating after the cylinder or plunger prone to problems:

  1. Surface coating with clear boundaries. Coating life is limited as to cause the new coating pineapple, damage to the seal.
  2. Surface finish is not enough, causing premature wear of seal wear.
  3. Surfaces, so that uneven force guiding and sealing, causing premature wear. In severe cases, a few days after the spill.
  4. Bottom diameter is inconsistent, the hydraulic cylinder after the repair or tolerance of a large diameter piston, causing premature wear of seal wear.
  5. Repaired cylinder or piston diameter is too large, because there is no grinding or grinding after plating is not enough. In the absence of the original cylinder design dimensions and tolerances, the manufacturers of the cylinder or piston repair works do not understand, and use the manufacturers can not provide the original cylinder design dimensions and tolerances, such problems too. In fact the former can be measured in the hydraulic cylinder repair worn or damaged parts without the size and tolerance, then press the tolerance to finish, if necessary, manufacturers, then press the tolerance to finish, if necessary, manufacturers can use to ask the manufacturer or the plunger of the cylinder dimensions and tolerances.

Hydraulic Feeder

June 28th, 2011 by hc2 No comments »

Hydraulic Feeder

Hydraulic feeder, is a CNC lathe feeder. Broad interpretation is the silly way of using the oil bath to control the work of all feeder. Mainly used for a variety of smoked yellow continuous boring equipment for automatic processing feed processing equipment to improve efficiency and automation. Currently using this machine is the largest CNC lathe can process various types of bar, so generally we are talking about is he index of hydraulic feeder with hydraulic control lathe feeder.

Features: ultra-low failure rate, bargain-hunting noise, vibration bargain-hunting, no leaks, no wear, low energy consumption.

Working principle:

By the hydraulic feeder preesure, feed tube, pusher rod, bracket, control circuit of five parts, the principle is the constant pressure pump to spice hanging there, push rod will push the bar into the spindle, it is also known as hydraulic feed machine. Studio bar in the feed tube of the hydraulic oil inside, when the bar rotates, the fluid damping in the stress reaction, the bar will float from the feed tube, when the speed is faster when the bar will be automatically suspended in the material central tube rotation, greatly reducing the feeding tube bar with the collision and friction. Studio vibration and noise is very small, especially for high-speed, long bar, precision machining parts.

Increasingly widespread application of the current domestic and international oil feeder, can support all kinds of machine tools in use, with automatic feeding machine tools to complete the work, while stock bar automatically, the machine automatically feed in the wait state, and inform the operator through a warming device feeding.


CNC lathes have generally supporting feeder hydraulic feeder, accumulator-type feeder, heavy hammer-type feeder, etc. reserve material storage type feeder large fluxes, to achieve non-stop continuous feeding, but feeding the small diameter cut prices higher. Hammer-type feeder structure is simple, cheap, but only for less precision parts processing, and noise and vibration are larger.

Hydraulic feeder is a feeder of a new product. These two feeder compared with feeder compared with feeding a wide range of diameter, length of feeding a long, easy operation, good stability, low noise, no wear and tear bar, run a small fault, use long life, affordable, etc.


In recent years increasing wages, many companies have emerged recruitment difficulties, forcing companies to update and transformation equipment, improve the degree of automation equipment, thereby reducing labor costs.

A new generation of hydraulic feeder to further improve its usefulness and safety and reliability, technically made a series of improvements to optimize the body’s component selection, connection structure, exhaust, filter and push feed rod rotation device, and so on.

Therefore, the hydraulic feeder can be widely used in various types of CNC lathes, and has good prospects for development.

hydraulic cylinders for mould|mold hydraulic cylinders

June 25th, 2011 by hc1 1 comment »

hydraulic cylinders for mould|mold hydraulic cylinders

Today,I am going to introduce a couple of very common types of hydralic cylinders for mould. usually,mold hydraulic cylinders have two general types:square type and round type.and HC Hydraulic Cylinders have both of this two types.

1.square hydraulic cylinders for mould

Square hydraulic cylinders for mould specification
square mold hydraulic cylinder with compact design can save installation space. this type of square mold hydraulic cylinder is mainly used in metallurgy equipment and heavy machinery, and also suitable for other industries.
This kind of square mold hydraulic cylinder tubes are made of carbon steel, after is honed  surface roughness is 0.3 ~ 0.6μm.oil seal and other seals are all impoted from England.which have high precision, resistant to oil, rusty, friction, loss, and pressure.
Here are some parameters of HC square hydraulic cylinders for mould :
Power fluid: Filtered oil
Material of dhliner bareel: Carbon steel STKM-13C∕Stainless tubes SUS304
The range of pressure(MPa): 0.3 ~ 16MPa(3 ~ 160kg∕cm2)
The range of temperature: -30 ~ +110(℃)
The range of speed (mm∕sec):8 ~ 300(mm∕sec)
Please see the real picture of hydraulic cylinders for mould mold hydraulic cylinders as below
 square hydraulic cylinders for mould
2.round mold hydraulic cylinders

round hydraulic cylinders for mould

These mold hydraulic cylinders are basically used to making moulds it has very many different kinds of accesary types,so it is wildly used for moulds making.

please see the real pictures of  these type of mold hydraulic cylinders as below:


HC round mold hydraulic cylinder include following specs:

1.all the cylinders are using english sealings and orings.

2.the roughness of inside cylinder serface is 0.3-0.6μm after boned.

3.The material of HC mold hydraulic cylinders is :D IN2316

4.The color of the HC mold hydraulic cylinders can be any color according to the requrement of our customers

Here are the information about the two basic types of hydraulic cylinders for mould mold hydraulic cylinders,hope this can be helpful for any friends ralated in this fields.

Witten by Jennifer from HC Hydraulic Cylinder

any question please send to my Eml:

valve not work well case of cause analysis and troubleshooting

June 18th, 2011 by hc2 No comments »

valve not work well case of cause analysis and troubleshooting 


Now we need to make a pushing car system, within the system includes the following valves: Solenold  valve, hydraulic lock, one-way throttle valve. System working pressure 8Mpa, used to enhance the doors fo the parlor.

Problem description

Each corresponding to the solenold is energized, when the pump star pressure, the cylinder does not move. Poke about with the manual method, the fuel tank before the action. What causes this, how to deal with it.

Tried approach

  1. The valve removed, cleaned , the viewer has no problem to change, and then install it on.
  2. The  system pressure is normal.


Answer one:

Do the solenoid valve energized with normal circumstances during the trial? I think you have a problem electromagnet.


Solenoid valve is normally have electricity, 24 volts DC, this is no problem.

Answer two:

380V or 220V AC through the transformer comes out 28AC, then after the bridge rectifier 24VDC reactor. If 24V DC is no problem(use a multimeter to measure the DC file to make sure), another solenoid valve, and I suspect you are AC or DC 24V.

Answer three:

 what you say is the timon cylinder is that right? You check the inside of the cylinder valve station, the cylinder stroke is to control the hydraulic cylinder to mention the door. Estimated limit switch problem, check the trip switch electrical signals, only development within the cylinder to an end when the trip switch is triggered, then the control valve will supply electrical signal.

Also as far as I know, the pump starts, was unloading relief valve, have power when it began to bear pressure on oil supply. I do not know the stroke of the coke pushing machine.


This system uses a 24 volt DC voltage control, have tried replacing the solenoid valve on the same( when providing the control voltage, no change to the spool, cylinder does not move.), and the new valve has been cleaned, the voltage should be no problem. The coke pushing car is more than 3meters point, there is no trip limit switch, the system is relatively simple.

Also as far as I know is that the pump starts, was unloading relief valve, when it began to get power to the system for the pressure oil. Relief valve and the valve is energized the same time.

I did not have a clearly stated, to be energized when the solenoid is energized, the cylinder is not understand the hand and then gently poke his control solenoid valve, the cylinder began to work.

Another point, to control his relief, if not play a role, then he should not move directly, ah, oil directly on the back of the tank. Now you have no doubt that the pressure relief valve system needs pressure not only produces this phenomenon.

Answer five:

You say the light from the situation, the problem should be very simple valve was charged, no change to the hand poke on the commutation. Is that right? In ensuring the solenoid valve, hydraulic lock, one-way direction of the throttle connection it is set arguments in the case, then check the valve spool. It might be placed for too long and result due to rust. In addition, you’d better check valve which is installed under the counter, because a lot of valves are symmetrical.

That’s true the problem is very simple, what you said is also possible, after all, is the appearance of new products is not necessarily. And the jack decided to install the valve does not reverse.

The final result:

Hydraulic cylinder caused due to electrical action is bad electrical contact, resulting in value was mainly the voltage.

Rubber Seal(2)

June 4th, 2011 by hc2 No comments »

CR rhloroprene rubber seal:
Resistant to sunlight, weather-resistant properties, especially good. Not afraid of

dichlorodifluoromethane and ammonia refrigerant, acid-resistant, oil resistant grease

system, aniline point in the expansion of low-volume mineral oil. RC rubber seals are easy to crystanllize at

low temperature, hardening. Applicable to all kinds of contact with air, sunlight, ozone,

environment and various fire, chemical corrosion resistant seal links. General temperature

range -55 ~ 120

IIR butyl rubber seal:
Particularly good air tightness, heat resistance, sunshine, good ozone resistance, good

insulation. Polar solvents such as alcohols, ketones and esters have a good resistance,

can be exposed to animal and vegetable oils or oxides. For resistance to chemicals or

vacuum equipment. IIR rubber seals are not recommended and petroleum solvents, kerosene or aromatic use both.

General temperature range -50 ~ 110.
Advantages of IIR rubber seal: air tightness, heat resistance, ozone resistance, aging resistance, chemical

resistance, and shock absorption, electrical insulation properties. Disadvantages of IIR rubber seal: slow

curing, processing performance is poor.

ACM acrylate rubber seal:
Have excellent resistance to oil, temperature, weather resistance are good, but the

mechanical strength, deformation rate and slightly lower water resistance. Generally used

for automobile transmission and in power steering system. ACM rubber seals does not apply to hot water,

brake fluid, phosphate. General temperature range -25 ~ 170

NR natural rubber seal:
Has good wear resistance, flexibility, tensile strength and stretching rate. However, NR rubber seals are esay

to aging in the air, changes viscosity when exposed to heat. Mineral oil or gasoline in

the easy expansion and dissolution, but the impatience acid alkali. Suitable for use in

automotive brake oil, ethanol, hydrogen and oxygen ions, which are used in the liquid.

General temperature range -20 ~ 100

PU polyurethane rubber seal:
Mechanical properties of polyurethane rubber is very good, have much better wear

resistance, high-pressure properties than the other rubber. PU rubber seals are also good at aging resistance,

ozone resistance, oil resistance, but easy hydrolysis temperature. Generally used for high

pressure resistance, wear-resistant sealing areas, such as hydraulic cylinder. General

temperature range -45 ~ 90

Rubber Seal (1)

June 2nd, 2011 by hc2 No comments »

Rubber Seal
NBR  nitrile rubber seals:
Department of hydraulic oil for the oil, flycol systems, hydraulic oil,

series lubricatiing oil, gasoline, water, silicone grease, silicone oil

and other media use. Is the most widely used and lowest cost rubber seals

currently. Does not apply to polar solvents, such as ketones, ozone,

nitro, MEK and chloroform, the general temperature range is -40 ~ 120

HNBR hydrogenated nitrile rubber seals :
Has excullent corrosion resistanc, tear and anti-compression deformation,
resistance to ozone, sunlight, weather. Better small abrasion resistance

than  nitrile rubber. HNBR  rubber seals for washing machine, car engine system and the use

of new enviromentally friendly refrigerant R134a refrigeration system.

Not recommended for use in alcohols, esters or aromatic solution, the

general use of a temperature range of -40 ~150

SIL silicone rubber seal:
Has excellent heat, cold, ozone resistance, resistance to atmosphoeric

aging. Good insulation properties. However,SIL rubber seals poor tensile strength than

normal and do not have oil resistance of rubber. For household appliances

such as electric water heaters, electric irons, microwave ovens. Also

applies to all kinds of supplies and human contact, such as water

bottles, drinking fountains, etc. Not recommended for use in most of the

concentrated solvents, oils, concentrated acid and sodium hydroxide.

General operating temperature range is -55 ~ 250. This kind of rubber seals

have arelatively high price.

VITON fluorocarbon rubber seal:
Better high temperature erformance than silicone rubber seals, has excellent

weather resistance, ozone resistance and chemical resistance, bad state

when it is cold. Have resistance with most kinds of oil and solvent,

especially acids, ester family of hydrocarbons, aromatic hydrocarbons and

animal and vegetable oils. For diesel engines, fuel systems and chemical

plants, sealing needs. Not recommended for use in ketones, low molecular

weight esters and a mixture containing nitrate. General use temperature

range 20 ~ 250

FLS Fluorosilicone rubber seal:
have the advantages perfomance of both fluorine rubber seals and silicone

rubber seals, oil, solvent resistance, and resistant to high temperature of

fuel oil are good. Resistant to oxygenated compounds, containing aromatic

solvents and chlorinated solvents erosion. Typically used in aviation,

aerospace and military aplications. Not recommended for exposure to

ketones and brake oil. General temperature range -5 ~ 200

EPDM ethylene propylene diene monomer rubber seal:
Has good weater resistance, ozone resistance, water resistance and

chemical resistance. For alcohols and ketones, can be used to seal high-

temperature waer vapor environment. For sanitary equipment, automotive

radiator and automotive brake systems. Not recommended for food use or

exposure to mineral oil. General temperature range -55~150

Test Mold

May 9th, 2011 by hc2 No comments »

Before delivery mold should be test mold first, sometimes even pilot production of small batch when necessary. Test mold include: Whether product forming process is resonable, whether mold structure design is reasonable, the level of mold manufacturing quality, if the product can be successfully formed, if the quality of forming product is compliance, the reasonableness of the standards adopted by the mold.

When testing mold, the following relevant personnel should be present: mold design, process planning staff, mold assemblystaff,  equipment operators and mold user.

Acceptance of the contents of the specific technical requirements of test mold:

Technical requirements for test mode of the workpiece.

Acceptance of the project includs

1. Geometry, size and dimensional accuracy, shape tolerances

2. Surface roughness

3. Decorative surface

4. Stamping burr and section quality

Technical requirements for acceptance of parts mold more products coated with the main label and related industries or national technical standards.

The technical requirements of the mold parts of testing mold including cavity and core quality standards, parts quality, quality of other auxiliary components

Special text mold parts and technical conditions; plastic injection mold parts and technical conditions; mold plastic injection mold

Mold assembly and test mold technical requirements:

1. Test overall size and shape of the mold position accuracy

2. Test guliding precision mold

3. Test gap and its uniformity

4. Test performance and its life

5. Mold visual inspection