Cylinder dismantling machine for ore support cylinder

1. 1、 Knock, commonly known as knock cylinder, called rod. Knock is an abnormal combustion phenomenon in the process of engine combustion. In short, "knock" is a phenomenon of abnormal combustion of engine. Detonation is abnormal pressure in combustion chamber caused by abnormal combustion. When the engine is knocking, it makes a knocking sound. The slight discontinuous knock sound is quite clear, a bit similar to the sound of tapping the triangle iron. When the knock is serious and continuous, the engine will have a "mile mile" sound, and the engine will be obviously weak at this time
1. Irregular metal knocking sounds such as "clattering", "clacking" and "Dangdang" occurred in the engine
2. Engine tremor
3. The engine temperature is too high
4. The fuel combustion is not complete, and there is black smoke in the exhaust gas
5. Engine power decreases
6. Fuel consumption increases
7. In normal driving, the speed suddenly changes inexplicably< Second, the main reason is that the ignition angle is too early: in order to make the piston obtain power immediately after the compression TDC, it usually ignites in advance before the piston reaches TDC (because it takes a period of time from ignition to complete combustion). If the ignition is too early, most of the oil and gas will burn when the piston is still in the compression stroke. At this time, the unburned oil and gas will bear great pressure and spontaneously ignite, causing detonation

2. Excessive carbon deposition in the engine:
excessive carbon deposition in the engine combustion chamber will not only increase the compression ratio (proce high pressure), but also proce high temperature hot spots on the carbon deposition surface, causing engine knock

3. The engine temperature is too high:
the engine in too hot environment makes the intake temperature too high, or the engine cooling water circulation is poor, will cause the engine high temperature and knock

4. Incorrect air-fuel ratio:
too lean fuel air mixture ratio will increase the combustion temperature, and the increase of combustion temperature will increase the engine temperature, which is easy to knock

5. Low octane number of fuel:
octane number is the index of knock resistance of fuel, and the higher octane number is, the stronger the knock resistance is. The engine with high compression ratio has high pressure in combustion chamber. If the fuel with low shock resistance is used, it is easy to knock< 3. Detection and maintenance 1. Detection of the change of engine combustion chamber pressure; The vibration frequency of engine block was detected; Test the mixture combustion noise
2. Direct detection of combustion chamber pressure change to detect engine vibration has high measurement accuracy, but the sensor is difficult to install and has poor rability. It is generally used for measuring instruments, and the actual application of pressure detection sensors are indirect detection
3. The fastest and most effective way to suppress detonation is to delay ignition advance angle and rece combustion pressure. Therefore, the working principle of the knock sensor is to delay the ignition advance angle to the ignition time when the engine knock is detected, and then slowly return the ignition advance when the engine does not knock.

2. Due to the design, material wear, field use and other factors of most structural parts of domestic hydraulic support, the hinge holes are deformed and the diameter increases in varying degrees, which seriously affects the stability of the support. At the same time, e to the long-time loading, part of the load-bearing mechanism exceeded the fatigue limit, resulting in weld cracks; Some side guard plates were seriously deformed. 2. Column and Jack
e to long-term use, the corrosion coating on the inner wall of cylinder and piston rod falls off seriously, the coating on column and Jack will be pulled, bruised, rusted and blistered, and the cylinder block will expand, which makes the cylinder diameter exceed the design deviation, and the elasticity of seal will drop significantly, which will lead to leakage, channeling and even leakage
the reliability and stability of control system (valves and rubber pipes) are reced e to corrosion, pollution and blockage. Due to aging, extrusion, hard damage and other factors, the hose must also be replaced.

3. Drain the oil and coolant. Take off all the wires and pipes and lift the engine out
When dismantling the engine, be sure to remove the peripheral accessories first, and then the belt of some wheels around it (note that the peripheral accessories can't be disassembled, such as the booster pump. It's very easy to disassemble if you don't understand this), and don't use sharp things. Then there are the valve cover and the cylinder head. When removing these things, you should pay attention to the order of removal. Then remove the oil pan and pay attention to the sequence of removing screws. And then there's the filter. This roughly breaks it down. The oil pump must not be disassembled. It is very difficult to install the oil pump after it is disassembled (the pressure is not enough). It's suggested that we go to a book or study it. It's not easy to open it. If you really don't understand, don't dismantle several shafts. At this point, it is estimated that your engine will not ignite when you install it again. The engine will not ignite until it is timed. Non professionals are advised not to dismantle it. If you have to dismantle it, you can't install it. If you really want to dismantle it, we can discuss it

4. First of all, remove the screw of the cylinder cover, take out the piston, and then the oil seal on the piston and guide sleeve can be replaced. Some oil seals need to be installed by heating, while others need some simple disassembly process equipment, such as process installation sleeve, etc. Lift: car lift is a kind of vehicle maintenance machinery used in automobile maintenance instry. Its proct nature and quality directly affect the personal safety of maintenance personnel. Lifting machine plays a vital role in the maintenance of automobile, no matter the vehicle overhaul or minor maintenance, it is inseparable from it. The famous foreign brands of lift are bend Pak, rotary, etc., and the domestic brands are antler, wanlikai amreoc, Jinhua (jig), hanmaxon, Xuda, Yuanzheng, aofu, Guangli, etc.

5. (cylinder liner, scientific name: cylinder liner.)< The thickness of wet cylinder liner is generally 5-7mm, which is mostly used in diesel engines; The wall thickness of dry cylinder liner is generally 2-4mm, which is mostly used in gasoline engine
2. When the geometric shape and size of the cylinder liner are out of limits, cracks, serious strain or water leakage of wet cylinder liner water stop ring occur, the cylinder liner should be removed and replaced. It is better to pull out with cylinder puller when disassembling. If there is no special tool, you can use a hand hammer to knock out the block from the crankcase
3. Attention should be paid to the following points when assembling the cylinder liner: (1) the difference between the dry cylinder liner and the wet cylinder liner is that the outside of the dry cylinder liner does not directly contact with the cooling water. This kind of cylinder liner has not been fitted with a cylinder liner before. When it is necessary to fit the cylinder liner after many times of sharp repair, it should be ensured that the cylinder liner is in contact with the cylinder bore 03-0. 08mm. For the convenience of mounting, the lower opening of the cylinder liner should have a small amount of roundness, and a layer of lubricating oil should be applied on the outer surface of the cylinder liner< (2) some diesel engine cylinder liner has a block on the end face, and the gap should be aligned with the swing direction of the connecting rod.
(3) when installing a new cylinder liner, ensure that the end face of the cylinder liner is 0.04-0.20 mm higher than the top plane of the cylinder block, and the higher value is slightly different for different models, and the protruding height in the surrounding direction should be the same. If the protrusion height is too small, the cylinder liner can not be pressed effectively after the cylinder head is tightened, and air leakage and cylinder gasket burning are easy to occur; The red copper pad should be added on the inner side of the shoulder of the cylinder liner. If the protruding height is too high and the pressing force of the cylinder liner is too large after tightening the cylinder head, it is easy to fracture at the shoulder of the cylinder liner, then it should be reprocessed.
(4) check the wall thickness difference of the cylinder liner. When installing, the thicker side of the cylinder wall should be installed in the swing direction of the connecting rod.

6.

Disassembly steps of cylinder liner of single cylinder diesel engine:

1. Preparation before disassembly:

prepare lifting equipment and special tools, and check and confirm the integrity of their technical status. Cover the upper part of the crank pin with canvas to avoid contamination of the oil pan by foreign matters. Clean the top of the cylinder liner and confirm the positioning mark

2. Install the special tool for disassembly:

put the gasket on the upper end face of the cylinder block, and put the pressing plate on the gasket across the diameter of the cylinder liner

insert the pull rod bolt through the middle hole of the pressure plate and the nut through the middle hole of the bracket with the lower part of the cylinder liner, so as to clamp the cylinder liner between the pressure plate and the bracket

3. Pull out the cylinder liner:

screw in the nut on the upper part of the pull rod bolt to graally pull out the cylinder liner. When the sealing rubber ring on the lower part of the cylinder liner crosses the mating surface, the cylinder liner is in a free state

continue to screw in the nut on the upper part of the pull rod bolt to clamp the cylinder liner between the supporting plate and the pressing plate

adjust the hook so that it is on the extension line of the cylinder axis, hang it on the lock and lift the cylinder liner out on the skid

extended data:

precautions:

1. Pay attention to the positioning mark before disassembly. If there is no mark, mark it in the appropriate place. Pay attention not to press the cylinder liner when placing the gasket

2. The lifting operator should obey the command, and the operation should not be too fast or too fierce, and pay attention to the safety of lifting

However, the following points should be noted:

attention should be paid to the correct assembly of metal sealing gasket. If it is necessary to apply sealant, sealant should be applied, and lubricant should be applied at the rubber ring to facilitate the positioning of cylinder liner

After the

cylinder set is positioned, the inner diameter deformation at the sealing rubber ring of the cylinder liner shall be measured by the inner diameter gauge, and the rection shall not exceed 0.03mm. Hydraulic test shall be carried out to check the sealing performance after the cylinder set is placed

7. The so-called pushing and sliding on the hydraulic support of coal mine is to use the pushing and sliding cylinder to push the scraper conveyor forward
the meaning of moving the hydraulic support is simpler: moving the hydraulic support. By jacking up the hydraulic support, raising the base, and then recovering the hydraulic cylinder, the hydraulic support will automatically move forward.

8. First remove the cylinder head and piston connecting rod, and then clamp the pulling force of the puller to the end of the cylinder. The puller is pressed on the engine body. Screw the pressure screw and knock the end. The cylinder liner will come out slowly. Without this tool, you can only smash the end and get it out. I'm really looking forward to helping you adopt it,

9.

Disassembly should be carried out in sequence. Due to the different structures and sizes of hydraulic cylinders, the disassembly sequence is slightly different. Generally, drain the oil from the two cavities of the cylinder, then remove the cylinder head, and finally remove the piston and piston rod. When disassembling the cylinder head of the hydraulic cylinder, special tools shall be used for the internal snap key or snap ring, and flat shovel is prohibited; The flange type end cover must be pushed out with screws, and hammering or hard prying is not allowed. When it is difficult to pull out the piston and piston rod, it should not be forced out, and the reason should be found out before disassembly

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