My company to purchase two steel SK320 god - 6 hydraulic crawler excavator, successively in the (north) beijing-zhuhai expressway (sea), open (flat) and Yang (river) used in the highway engineering construction and to achieve good results. In order to realize multi-usage, better play to the machine conditions, in the construction of the of stones, of stone crushing assignments and in the old pavement reconstruction of old cement concrete pavement broken homework, for hydraulic hammer of a hydraulic excavator configuration.
Hydraulic hammer belongs to shock type hydraulic vibration device, also known as the crushing machine, etc. It is mainly used in rock in engineering, reinforced concrete, asphalt concrete pavement, and old buildings and other hard material crushing, punching, demolition and other operations.
After the company technical personnel analysis and comparison, decided to adopt the Ingersoll rand monterey bay VI1200 type hydraulic hammer, the following is the analysis of the hydraulic hammer when choosing and the matters that should pay attention to the hydraulic circuit.
Reasonable allocation of excavators and hydraulic hammer
2.1 excavator and the theoretical base of the reasonable configuration of hydraulic hammer
Can make hydraulic excavator and the rational allocation of hydraulic hammer hammer play a better efficiency, ensure the service life of hydraulic hammer and excavator. Generally in excavator machine operation quality ratio coefficient, install the spare valve of hydraulic hammer of output flow and pressure flow, pressure and hydraulic pressure hammer job considering aspects and so on.
(1) the excavator machine operation quality ratio coefficient
Ratio coefficient = (x excavator hydraulic hammer work weight ground maximum radius)/(x crawler excavator machine operating weight around half of the lateral spacing) if the formula to calculate the ratio is less than 0.3, shows that the hydraulic hammer picked the little, will cause the damage of hydraulic hammer soon: if the ratio is greater than 0.5, shows that the hydraulic hammer picked the big influence its effect.
(2) the work flow and pressure
Selected hydraulic hammer, attention should be paid to make the flow of hydraulic hammer requirements are in conformity with the output of excavator spare valve flow. Flow is proportional to the hydraulic hammer impact times, flow is too small can not meet the intended purpose. But the traffic is too big, can make the hydraulic system produces too much heat, causing the oil temperature rise too high, reduce the service life of hydraulic hammer. Also, take an examination of the filtrate pressure hammer work pressure and the limit pressure of spare valve. If not consistent, should be within the scope of spare valve adjustment adjustments according to the rated pressure of the hydraulic hammer.
2.2 excavators, hydraulic hammer related technical parameters
2.3 configuration
(1) the operation quality ratio coefficient
In steel SK320 god - 6 hydraulic crawler excavators and hydraulic hammer configuration, according to the ratio coefficient formula:
(1601 x 11)/(33300 x 3.2/2) = 0.32 illustrates this configuration is reasonable.
(2) the work flow and pressure
God steel SK320-6 hydraulic crawler excavator working organs of the hydraulic flow rate of 250 l/min is greater than the Ingersoll rand monterey bay VI1200 type within the scope of the flow of hydraulic hammer (minimum: 120 l/min, maximum: 170 l/min).
SK320-6 hydraulic crawler excavator working mechanism of system pressure for 385 KGF/cm2, over VI1200 type hydraulic hammer.
Can be seen from the configuration analysis, steel SK320 god - 6 hydraulic crawler excavator working flow, pressure and Ingersoll rand VI1200 work flow and pressure of hydraulic hammer is not consistent. But considering the operation quality ratio coefficient is reasonable and steel SK320 god - 6 hydraulic crawler excavator work flow and pressure are higher than the hydraulic hammer work flow, pressure, so it can be SK320-6 and VI1200 system equipped with pressure reducing valve, namely the system to be modified, to reduce the pressure to achieve.
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3. The modification of the hydraulic system
3.1 the process
The matters that should pay attention to 3.2 modification
(1) the general excavator in the factory is equipped with a spare valve, must from the pilot control system of oil supply line () after the safety lock valve tee joint lead to pressure oil, again through the solenoid valve control valve.
(2) if the excavator valve is used in the factory is not equipped with, is between SK320-6 and VI1200 system equipped with pressure reducing valve.
(3) the higher return oil pressure can reduce the impact of the hydraulic hammer, in order to minimize the gas back pressure of hydraulic hammer, the return pipe through filter directly back to the hydraulic tank (not the spare valve).
(4) in order to facilitate change bucket, in close to the hydraulic hammer pipe should be equipped with stop valve. When installing line should pay attention to prevent debris entering the hydraulic system, to clean steel and connectors, hose shall not be reversed.
(5) when installing hydraulic hammer excavator to the mixed line and accessories.
The matters that should pay attention to when using 3.3
3.3.1 correct operation
Proper operation can improve the efficiency of the operation of hydraulic hammer, and can prolong the service life of excavators and hydraulic hammer. Operation should pay attention to the following:
(1) always with broken hydraulic hammer drill rod surface vertical, drill press broken objects. Broken hydraulic hammer to immediately stop after work, to prevent air play.
(2) when breaking particularly hard object, should first starts from the edges, not on the same point hammer for more than a minute, he burned to prevent drill rod or hydraulic oil overheating.
(3) the excavator slewing don't let the drill rod meet other objects, not to mention the hydraulic hammer lifting heavy objects.
(4) when the water homework will only make drill rod immersed in water. If you really need to hydraulic hammer all submerged assignments, need to use special underwater operation of hydraulic hammer. Role after the completion of the cleaning, cleaning in time.
3.3.2 rainfall distribution on 10-12 maintenance
Because the working conditions of the hydraulic hammer is very bad, correct maintenance can reduce the occurrence of failure and prolong the service life of equipment. Besides of excavator maintenance, the following points should be paid attention to.
(1) check the drill rod bushing with clearance, and see if there were any hydraulic oil leakage. If any oil leakage, low pressure oil seal is damaged, please repair personnel should be replaced.
(2) check whether the related bolt is loose, the joint pin if there is not normal wear and tear.
(3) points plus at least twice per shift grease lubrication device.
(4) using a hydraulic hammer metamorphism and pollution of hydraulic oil faster than ordinary bucket operations, should be replaced according to the normal cycle of half to replace the hydraulic oil filter cartridge in the system.
3.4 the use of the modified effect
Modified immediately in the southern section of beijing-zhuhai expressway guangdong border 31, 32, the pavement of gravel in the crushing of raw materials production, successfully completed nearly 600000 material task decomposition, task decomposition is planned by blasting materials + artificial methods nearly two months to finish ahead of time, save money nearly three million yuan.
4 conclusion
God steel SK320-6 crawler type hydraulic excavator and Ingersoll rand monterey bay VI1200 type hydraulic hammer supporting modification of actual use in good condition. In engineering construction of tension for the company to win time, reduce the cost.
Visible, hydraulic excavator and form a complete set of hydraulic hammer modification must be earnest analysis, only the reasonable configuration to take maximum potential hydraulic hammer, in use process we will strictly according to the provisions of the manual operation. Only in this way can ensure the reasonable use of hydraulic hammer, it realizes the multi-use of the hydraulic excavator, better service for engineering.
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