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200lpm Mining Machinery Directional Control Valve

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200lpm Mining Machinery Directional Control Valve

200lpm Mining Machinery Directional Control Valve
200lpm Mining Machinery Directional Control Valve 200lpm Mining Machinery Directional Control Valve 200lpm Mining Machinery Directional Control Valve

Large Image :  200lpm Mining Machinery Directional Control Valve

Product Details:
Place of Origin: CHINA
Brand Name: HANJIU
Certification: CE
Model Number: P series, DCV series, BM series
Payment & Shipping Terms:
Minimum Order Quantity: 100 Sets
Price: Start from 18 usd
Packaging Details: 1 pc per Box, Boxes on Pallet
Delivery Time: 19 work days
Payment Terms: L/C, T/T, Western Union, Western Union
Supply Ability: 300000 sets per year
Detailed Product Description
Item: Mining Machinery Parts Model No.: P40, P80, DCV120, DCV200, BMT, BMK6
Pressure: High Pressure Flow: 20 Lpm Upto 200lpm
Product: Hydraulic Motors, Directional Control Valves Application: Hydraulic Systems
High Light:

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Trouble shooting and maintenance of hydraulic system of mining machinery

 

 

Nowadays, hydraulic transmission has penetrated into all aspects of mining machinery, from the initial steering and working devices to the current walking, braking and control of various operating systems, it is almost everywhere. Due to the labor-saving, easy-to-operate hydraulic transmission, it is not restricted by site and space, has high safety, and is easy to prevent overload, which greatly improves the comfort and production efficiency of mining machinery. However, the complexity of the hydraulic system, the variety and concealment of faults have also become a major problem in the repair industry. Combining my years of work experience, I have summed up some tips on hydraulic transmission failures for your reference.

 

 

200lpm Mining Machinery Directional Control Valve 0

 

 

1. Hydraulic system fault diagnosis

 

Hydraulic transmission is widely used in the field of mining machinery. It is applied to the oil by the kinetic energy generated by the prime mover, with additional control elements such as oil pressure, oil volume, sequence, and auxiliary elements such as filters, accumulators, etc., which are transmitted through pipelines. Provide actuators such as hydraulic cylinders, hydraulic motors, etc. to achieve a series of movements such as equipment lifting, rotation, reciprocating and walking.

 

Before the inspection and troubleshooting of the hydraulic system, it is necessary to understand the principle, composition and correct flow rate of the hydraulic system and the pressure value of each part of the system. When dealing with it, the pressure must be relieved before operation. The assembly components of the working hydraulic system shall not be disassembled at will. If disassembly and inspection must be carried out, the disassembly and assembly shall be followed in the order of the operating procedures and marked. Do not bump or scratch the working surface of the parts, so as not to affect the working performance of the components. For example, when disassembling working oil pumps, oil cylinders and various valve bodies, pay attention to protecting the seals, O-rings, seal rings, dust-proof rings and piston rings. If they are scratched, crushed, or deformed, they need to be replaced. When disassembling hydraulic components such as pipelines, valves, pumps, and oil cylinders, they must be blocked with a sealed bag to block the oil holes to prevent debris, iron filings and other debris from entering. When installing a hydraulic pump, it must be filled with clean hydraulic oil before starting to avoid early wear due to no oil in the pump at the initial start-up. In particular, the plunger pump advocates low-pressure start, and adjusts to standard oil pressure after the oil pressure rises. When installing the oil pipe, use compressed air to blow off the oil and sundries in the pipe. The pipe should not be bent or stressed, and should be installed naturally. The above are all related to the working quality of hydraulic components and cannot be ignored.

 

The faults of the hydraulic system are roughly divided into the following categories: leakage, low oil pressure, malfunctioning, substandard speed, slow commutation, crawling, and failure to implement the automatic circulation of the movement correctly, as well as weak movement, noise, and excessive vibration. Large, impact and oil temperature is too high. When the hydraulic system fails, it is generally used to see, listen, mold, smell and pressure test. Look, first turn off the engine, reset all working devices, and then work on the hydraulic system and its components to observe:

 

 

①Check whether the oil level of the hydraulic oil tank is normal:
②Observe the oil bubbles in the hydraulic oil tank and see if there is any oil Discoloration;
③Remove the hydraulic oil filter to check for foreign objects:
④Check all pipes and joints for leakage and damage;
⑤Check whether the speed of the hydraulic moving parts is normal and whether there is abnormal jitter.

 

 

Listen, listen to the hydraulic oil pump, cylinder, and various hydraulic valve bodies for abnormal noise. Touch and touch the hydraulic pump, valve, and actuator to see if the temperature is too high or abnormally shaking. The smell is to distinguish whether the hydraulic oil has deteriorated or failed. Sometimes the use of assembly interchange is also an effective method. Pressure testing is a systematic, scientific and extremely effective method, because any hydraulic system failure will be accompanied by abnormal pressure. Specific steps: prime mover-hydraulic pump-control valve-auxiliary component-actuating component, using segmented detection system pressure to judge whether a certain component is normal.

 

The faults of abnormal hydraulic system pressure include: hydraulic pump quality wear, damage, leakage and air intake. The overflow valve is stuck, blocked, spring broken, deformed or not tightly sealed, the hydraulic cylinder is worn, the gap is too large or the sealing ring is broken, the pipeline leaks, the oil pressure gauge is damaged, the hydraulic oil is deteriorated, the viscosity is low, and the hydraulic oil filter is blocked Wait.

 

 

The high temperature faults of the hydraulic oil system include: the hydraulic pump is worn, the internal leakage is large, the pressure regulating valve of the overflow valve is too high, the oil pipe is slender and bent, and the hydraulic oil cooler is faulty. The major noise and vibration faults of the hydraulic system include: hydraulic pump wear, air intake, oil filter blockage, poor oil suction, excessive oil viscosity, high flow resistance, failure of the overflow valve to cause system pressure fluctuations and noise; pipes are too long , Is too soft, and there is no pipe clamp fixed to cause flattening or shaking. The malfunction of the electronic control hydraulic system and the pneumatic control hydraulic system should be checked from the control electric and pneumatic circuits.

 

 

 

2. Maintenance of hydraulic system

 

70% of hydraulic system failures are caused by hydraulic oil pollution and non-compliance. The pollution of hydraulic oil is extremely harmful, blocking the throttle and damping holes, causing malfunction, causing the pump to wear and leak, and the pressure to drop. The hydraulic cylinder will accelerate the wear of the seals, increase the leakage, and weaken the problem, which shows that the selection of hydraulic oil is very critical. Hydraulic oil is a liquid working medium used to transfer energy in a hydraulic system. It also plays a role in lubrication, cooling, sealing, anti-corrosion, cleaning and damping. Therefore, the reasonable selection, use, maintenance and storage of hydraulic oil is the key to the reliability, durability and performance of the hydraulic system, and it is also a powerful guarantee for reducing the failure of the hydraulic system. Therefore, it is necessary to understand the nature of hydraulic oil properly and use hydraulic oil reasonably to reduce hydraulic system failures.

 

Compared with ordinary mechanical equipment, the hydraulic system of mining machinery has high peak pressure, fast flow rate, high breathing rate of the system, and complex air composition in the working environment. High pressure, fast flow rate, long pipelines and many bends cause large energy loss in the system and accelerate the rise of oil temperature. Once over 80C will affect the service life of the hydraulic oil, and it is also easy to produce bubbles, noise, resonance, cavitation, etc., which will cause early damage to the equipment structure. The breathing rate is high, and the air composition in the working environment is complex, and it is easy to inhale harmful substances and moisture in the air, causing the oil to fail.

 

This requires that when selecting oil, first learn from the manual of the hydraulic equipment the composition, structure and related parameters of the hydraulic system, the high safe oxidation and good defoaming properties of the hydraulic oil. For example, the type of main hydraulic pump included in the system and its working pressure, speed, displacement, the temperature range that the system needs to control, the accuracy of filter filtration, the presence or absence of high-precision devices such as electro-hydraulic servo valves, and the capacity and work of the hydraulic oil tank Environmental temperature, etc. To clarify the precautions for the specified or recommended oil in the manual, you should try to use the oil recommended by the original manufacturer. If a substitute is needed, it must meet the technical performance of crude oil, combined with the local temperature and working environment, high ambient temperature and high pressure areas should use high-viscosity hydraulic oil. Based on the principle of higher than lower, higher than lower. Do not mix with hydraulic oils of different viscosity grades or hydraulic oils of different manufacturers with the same viscosity grade.

 

 

Regular replacement of hydraulic oil is an effective way to control hydraulic oil pollution. Strictly implement the oil change cycle, because there are many hydraulic oil pollution that can not be observed with the naked eye, such as the loss of additives, failures, and changes in the physical and chemical properties of the base oil. Using an oil performance detector to detect the physical and chemical properties of the oil is the most scientific and economical way to determine the replacement of hydraulic oil. Therefore, the hydraulic system is regularly maintained, oil changed, filters replaced, hydraulic system oil tanks cleaned, and aging pipelines replaced. Make the hydraulic system always in the cleanest

Net and most reliable working condition.

 

Hanjiu Hydraulics, hydraulic expert by your side!

 

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