This article mainly introduces:

Costa Rica hydraulic cylinder,large bore cylinder manufacturer,large bore cylinder

(Costa Rica large bore cylinder,produced by Hebei Hengyu company）

large bore cylinder are widely used in Costa Rica，because of no transmission clearance，powerful torque，clever hydraulic energy conversion.So our company has designed large bore cylinder for customers from Costa Rica.

Introduction to large bore cylinder:

What kind of process is used in the large bore cylinder to make high-quality large bore cylinder products: the body is the main component of the large bore cylinder, mining single pillar, hydraulic support, gun tube and other products, and its processing quality directly affects the life and reliability of the entire product. Body processing requirements are high, the internal surface roughness requirements are Ra0.4 ~ 0.8&um, the coaxiality, wear resistance requirements are strict. The basic feature of body is deep hole processing, which has always troubled the processing personnel. The large bore cylinder products of our company mainly use rolling processing, because the surface layer has surface residual compressive stress, which helps to close the surface micro-cracks and hinder the expansion of erosion. Thus, the corrosion resistance of the surface can be improved, and the fatigue crack can be delayed or expanded, and the fatigue strength of the body can be improved. The correct rolling process of the large bore cylinder block: broaching block - fine boring block - grinding block. The rolling method is: broaching block - fine boring block - rolling block, the process is 3 parts, but the time is compared: grinding 1 meter of the block is about 1-2 days, rolling 1 meter of the block is about 10-30 minutes. Input comparison: grinding machine or quilting machine (tens of thousands - millions), rolling knife (ten thousand - tens of thousands). After rolling, the surface roughness of the hole decreases from RA3.2-6.3um before rolling to RA0.4-0.8&um, the surface hardness of the hole increases by about 30%, and the fatigue strength of the inner surface of the large bore cylinder increases by 25%. If the service life of the large bore cylinder is only considered, it is increased by 2 to 3 times, and the efficiency of the boring and rolling process is about 3 times higher than that of the grinding process. large bore cylinder misoperation or operation failure may be caused by the following reasons, you can start from these aspects of the investigation: (1) spool stuck or valve hole blocked. When the spool of the flow valve or direction valve is stuck or the valve hole is blocked, the large bore cylinder is prone to misoperation or operation failure. At this time, the contamination of the oil should be checked; Check whether dirt or colloidal deposits are stuck in the spool or blocking the valve hole; Check the wear of the valve body, clean and replace the system filter, clean the fuel tank, and replace the hydraulic medium. (2) The piston rod and large bore cylinder are stuck or the large bore cylinder is blocked. At this time, no matter how to manipulate, the large bore cylinder does not move or moves very little. At this time, check whether the piston and piston rod seal is too tight, whether it enters the dirt and gum deposits: whether the shaft line of the piston rod and the large bore cylinder is in the center, whether the wearing parts and seals are invalid, and whether the load is too large.

When the large bore cylinder is disassembled due to oil leakage and other faults, the position of the piston should be moved to any end position of the large bore cylinder by applying liquid pressure. Improper tapping and sudden drop should be avoided during disassembly.

When installing the large bore cylinder, the axial ends of the large bore cylinder cannot be fixed. Due to the effect of liquid pressure and thermal expansion in the large bore cylinder, there is axial expansion. If the two ends of the large bore cylinder are fixed, all parts of the large bore cylinder will be deformed. When disassembling the large bore cylinder, it is strictly forbidden to hammer the large bore cylinder and the piston surface, such as the large bore cylinder hole and the piston surface is damaged, do not allow sandpaper grinding, to use a fine oil stone carefully grinding. The clearance between the guide sleeve and the piston rod should meet the requirements.

large bore cylinder seal leakage causes and countermeasures: a. Loose tie rod nut will cause leakage, tighten the tie rod nut according to the torque requirements of tie rod nut, test no leakage can continue to use. b. Pressure exceeding the limit will also cause leakage. Replace the large bore cylinder seal and re-tighten the tie rod nut to reduce the pressure to the nominal pressure range of the large bore cylinder. c. The large bore cylinder seal is extruded, if the O-ring is obviously extruded at the large bore cylinder seal, replace the large bore cylinder seal.

Answers to some questions about large bore cylinder:

How to calculate the hydraulic cylinder pressure? How much pressure can put up how much weight?
If you want to calculate the pressure of the cylinder, you must know the inner diameter of the cylinder, if the piston rod is needed to lift the weight, it should be: cylinder (no piston rod end) pressure = load (4000N) ÷{(PI /4)X the square of the cylinder diameter (mm) ", it has nothing to do with the piston rod diameter, the rod diameter of the piston rod is only related to the stability of the cylinder. The pressure inside the cylinder should be p=F/S=400×10/(3.14×(0.5×25)×(0.5×25))=8.15MPa which means that you need to provide at least that much pressure to complete the operation.

Where is the tension cylinder used in the excavator?
Get off the inside of the frame, behind the guide wheel (steering wheel, guide wheel). Disassemble the track and take the guide wheel out to see the tensioning cylinder (track spring).