KR20070105482A - Oil jack - Google Patents

Abstract

An oil jack is provided to control the excessive inflow of hydraulic pressure into a cylinder chamber by overflowing the extra hydraulic pressure to an oil storage chamber, preventing over ascending of a ram. An oil jack(1) comprises a cylinder(3), an oil tank(4), a ram(5), an oil path(25), and a hydraulic path(23). The cylinder and the oil tank are fixed on a surface of a base plate(2). The ram is capable of moving up and down in a cylinder chamber(31) of the cylinder so as to lift an object. On the base plate, the oil path and the hydraulic path are respectively connected to an oil port(24) on a bottom of an oil storage chamber(41) of the oil tank and a hydraulic port(22) on the bottom of the cylinder chamber, to supply oil stored in the oil storage chamber to the cylinder chamber or return the hydraulic pressure flowed to the cylinder chamber back to the oil storage chamber. On each upper and lower ring groove(33,34) formed on the upper and lower sides around an overflow hole(32) on an upper side of the cylinder, upper and lower O-rings(6a,6b) are elastically contacted on the outer surface of the ram, allowing the ram to reciprocate, with space away from the inner surface of the cylinder, and restricting the leakage of hydraulic pressure. The ram includes a through hole(51) in its center, where a ram support bolt(7) is inserted and fastened to an internal thread hole(21), so as to be positioned in the center of the cylinder chamber, guiding the ascending movement of the ram while controlling the ram to be ascended up to a predetermined height.

Description

Oil Jack {Oil jack}

1 is a state diagram used in one embodiment for explaining the present invention.

2 to 4 is a cross-sectional view of the oil mill operating state of the present invention.

Figure 5 is an exploded perspective view showing the ram separated from the cylinder of the oil refiner of the present invention.

※ Explanation of code for main part of drawing

1: Oil small 2: Floor board

21: female thread 22: hydraulic access hole

23: hydraulic passage 24: oil access hole

25: oil passage 3: cylinder

31: cylinder chamber 32: overflow hole

33,34: upper and lower ring grooves 4: oil tank

41: oil storage chamber 43: pneumatic supply pipe

44: oil supplement 5: ram

51: through hole 52: locking hook

53: sealing nipple 54: overflow passage

6a, 6b: Upper and lower O-rings 61: Dust sealing

7: ram support bolt 71: head

72: male thread 8a: hydraulic circuit device

8b: Air Booster 81: Main Pneumatic Hose

82: bypass pneumatic hose 83: between valve operation

Patent number 399254

Patent number 510750

Patent No.510751

Patent number 523999

The present invention relates to an oil refiner used for lifting heavy weights such as automobiles.

In general, the oil generator used when lifting a car in an automobile repair shop is composed of a dual structure in which a cylinder mounted to raise and lower the ram to lift an object is installed inside an oil tank where oil is stored. As it is, there are manual type and automatic type.

Manual oil grinder is configured to raise ram by pumping oil stored in oil tank and supplying to cylinder by operating oil pump operation between up and down. In this case, the oil is supplied to the storage cylinder cylinder by manual operation of the valve mounted on the oil pumping passage to recover the oil tank.

And the automatic oil grinder is configured to raise the ram by the operation of sucking the oil in the oil tank and supplying it to the cylinder by using the air booster pumped by pneumatic pressure supplied from the compressor. Like the manual oil grinder, it is composed of the structure that the oil supplied to the cylinder is recovered to the oil tank by manually operating the valve mounted on the oil pumping passage of the hydraulic circuit block.

The existing oil grinder has the disadvantage of increasing production cost because the cylinder on which the ram is mounted has to be internally polished, which has a higher processing cost than the external grinding process. In addition, the bottom of the ram is raised to the set height. Even when the operation is completed, a separate safety valve for overflowing the excess oil into the oil tank must be installed when the hydraulic pressure continuously flows into the cylinder. It was pointed out that the production cost of the oil crusher became expensive due to the additional cost and the price competitiveness was lowered.

As an example, it will be described with respect to the oil cultivator introduced in the prior art patents 399254, Patent 510750, Patent 510751, Patent 523999, etc., which are pre-registered by the present applicant, One or more rams which are mounted to be elevated and lowered are formed with an expanded diameter at the lower end of the ram so as to be caught on the upper end of the cylinder when they are raised to a set height. It can be seen that the piston ring (O-ring) is configured to operate in a hermetic contact with the inner surface of the cylinder.

As described above, the oil refiner of the prior art has to precisely polish the inner surface of the cylinder so that the piston ring can block the leakage of the hydraulic pressure, so that the hydraulic pressure supplied to the cylinder can raise the ram with a strong force. However, if the inner surface of the cylinder is not precisely machined, there will be a small gap between the piston ring mounted on the lower end of the ram, and the leakage of hydraulic pressure will occur. The ram is weakened because it is not acted on and part leaks, and the ram is lowered by the load of the object. In addition, if the inner surface of the cylinder is not smooth, the phenomenon that the piston ring to move up and down with the ram is easily broken, the oil can not be used may occur.

And, even if the inner surface of the cylinder is precisely ground, even if the hydraulic pressure continues to flow into the cylinder even when the ram is completed to the set height, the oil must be provided on one side of the upper portion of the cylinder to overflow the oil into the oil tank. The overflow hole is formed, but since the inner end of the overflow hole is a state in which only the bur generated when the drill is drilled is removed, the inner end of the overflow hole has a cross section perpendicular to the inner surface of the cylinder. have. Therefore, whenever the piston ring installed at the bottom of the ram passes through the overflow hole, the piston ring is easily cut due to the frictional wear with the inner end of the overflow hole formed at right angles. The problem arises that the damage can not block the leakage of the hydraulic pressure is reduced the reliability of the oil compactor.

The present invention is a new structure in view of the various problems appearing in the prior art as described above, to simplify the processing process of the parts in manufacturing the oil grinder to reduce the production cost, and also the service life of the oil grinder It was invented for the purpose of providing an oil grinder that can extend the length and give reliability to the quality.

The present invention as a means for achieving the above object,

The lower end is fixedly attached to the upper surface of the bottom plate and the upper end is installed in an open state, and formed with a larger diameter than the cylinder so that the lower end is fixedly attached to the upper surface of the bottom plate and the upper end is welded to the upper end of the cylinder An oil tank to be installed and a ram for lifting and lowering the object are installed in the cylinder chamber of the cylinder, and the bottom plate is provided with the oil entry hole formed at the bottom of the oil storage chamber of the oil tank and the cylinder. And an oil passage and a hydraulic passage connected to each of the hydraulic access holes formed at the bottom of the cylinder chamber to supply the oil stored in the oil storage chamber to the cylinder chamber or to recover the hydraulic pressure introduced into the cylinder chamber to the oil storage chamber. In the oil grinder,

The cylinder has an upper and lower ring grooves formed at the upper and lower sides of the overflow hole formed at the upper side thereof to allow the ram to be lifted and separated from the inner surface of the cylinder, and to block hydraulic leakage. Upper and lower O-rings are installed to support the outer surface of the ram in elastic contact.

The ram has a through hole formed at the center thereof, and is inserted into the ram through a screw threaded into a female screw hole formed in the bottom plate so as to be positioned at the bottom center of the cylinder chamber to guide the lifting operation of the ram. It characterized in that it comprises a ram support bolt for controlling the ram to rise only up to a set height.

In addition, the ram is formed in the lower end of the through-hole engaging hook engaging to the head of the ram support bolt to control to rise only up to the set height in the cylinder chamber, and the lower end of the cylinder after the ram is completed An overflow passage for overflowing the hydraulic pressure to the oil storage chamber through the overflow hole formed in the upper portion of the cylinder to the hydraulic pressure supplied to the seal is formed.

In addition, the ram is characterized in that it further comprises that the sealing nipple for closing the upper end of the through hole in order to prevent the leakage of the hydraulic oil through the through hole in which the ram support bolt is installed is screw assembly. .

In addition, the inside of the upper one side of the oil tank is characterized in that it further comprises a pneumatic supply pipe for injecting the pneumatic pressure supplied from the outside into the inner upper portion of the oil reservoir.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a state diagram of the use of one embodiment for explaining the present invention, Figures 2 to 4 is a cross-sectional view showing the operating state of the oil grinder of the present invention, Figure 5 is an exploded perspective view showing the ram separated from the cylinder of the oil grinder of the present invention It is shown.

Reference numeral 1 denotes an oil grinder, and the oil grinder 1 has a structure in which a cylinder 3 and an oil tank 4 are combined in a double structure on the upper surface of the bottom plate 2 as in the prior art. In addition, a ram 5 is inserted into the cylinder 3 so as to be lifted up and down.

A feature of the present invention is that the ram 5 can be moved up and down without being in direct contact with the inner wall of the cylinder 3, thereby reducing the production cost by simplifying the manufacturing process of the oil compactor 1. In addition, even if the ram 5 is repeatedly lifted and operated, the O-ring for preventing the leakage of hydraulic pressure is not damaged, thereby increasing the reliability of the oil compactor 1.

To this end, in the present invention, even when the ram 5 rises to the set height, when the hydraulic pressure continues to be excessively introduced into the cylinder chamber 31 of the cylinder 3, the oil tank 4 receives the excess hydraulic pressure. Upper and lower ring grooves 33 formed in an annular shape on the upper and lower inner surfaces thereof with reference to the overflow hole 32 formed in the upper one side of the cylinder 3 in order to overflow into the oil storage chamber 41 of the ( 34, the upper and lower O-rings (6a) (6b) is installed, the inner portion of the upper and lower oil (6a) (6b) toward the cylinder chamber 31 from the upper and lower ring grooves (33) (34) The ram 5 inserted into the cylinder 3 is in direct contact with the inner surface of the cylinder 3 while allowing the ram 5 to move up and down while being elastically in close contact with the outer surface of the ram 5. The lifting and lowering operation is performed while not in the state, and at the same time, the cylinder 5 is introduced into the The hydraulic operation of W was not to leak.

As described above, when the cylinder 3 and the ram 5 are installed so as not to contact each other, the internal grinding, which requires precise processing of the inner diameter of the cylinder 3, as in the prior art, may be omitted. The outer surface of the ram 5 to be lifted and operated while directly contacting the upper and lower oils 6a and 6b installed inside the upper part of the upper part is precisely polished. Since the round bar is smoothly processed to some extent during manufacturing, the outer diameter of the ram 5 can be precisely and smoothly by cutting the outer surface of the ram 5 in order to check the straightness after cutting to the ram 5 specifications. The outer diameter polishing rate to be polished is very cheap compared to the inner polishing rate to polish the inner diameter of the cylinder as in the prior art. Therefore, the process of polishing the outer diameter of the ram 5, as in the present invention, the processing cost is reduced compared to the process of polishing the inner surface of the cylinder 3 can not only reduce the production cost of the oil mill 1, but also improve productivity You can do it.

In addition, the through hole 51 penetrating up and down the central portion of the ram (5) in order to prevent the further rise when the ram (5) inserted into the cylinder (3) is installed up to the set height is no longer raised. Although forming a lower end of the through hole 51, as described below, the engaging projection 52 is engaged with the head portion 71 of the ram support bolt 7 is formed, the engaging projection 52 A female screw hole 21 is formed in the bottom plate 2 exposed through the reduced inner diameter of the.

The ram support bolt 7 is inserted into the through hole 51 formed in the center of the ram 5, and the ram support bolt 7 has an inner diameter of the engagement ring 52 at which the male screw 72 formed at its lower end is engaged. Is screwed to the female threaded hole 21 formed in the bottom plate 2 through the fixing is installed in the through hole 51 of the ram 5, the head portion 71 of the ram support bolt (7) Is formed at a position where the ram 5 can be raised to a set height, and when the ram 5 is raised to a set height, the latching jaw 52 is caught by the head 71 and is no longer raised. You won't be able to.

And after inserting and fixing the ram support bolt (7) in the through hole 51 of the ram 5, the sealing nipple 53 on the upper end of the through hole 51 to seal the through hole 51 ) Is a screw assembly, and an overflow passage 54 is formed at one side of the lower end of the ram 5 to overflow the hydraulic pressure excessively introduced into the cylinder chamber 31 into the oil storage chamber 41. The upper end of the cylinder (3) is equipped with a dust seal 61 for preventing foreign matters such as dust from penetrating into the cylinder chamber (31) and to protect the upper and lower oils (6a) and (6b).

The overflow passage 54 is formed in the state extending from the bottom of the ram 5 to the lower side wall of a predetermined height so that the ram 5 rises to a set height so that the head of the ram support bolt 7 It is configured to overflow the oil pressure excessively introduced into the cylinder chamber 31 from immediately before being caught by the 71 to the oil dressing chamber 41 through the overflow hole 32.

As described above, in order to allow the hydraulic pressure flowing into the cylinder chamber 31 to flow into the oil storage chamber 41 immediately before the ram 5 is caught by the head 71 of the ram support bolt 7. An annular groove 32a is formed at the inner end of the overflow hole 32 formed in the upper portion of the cylinder 3, and the overflow passage 54 is formed in the ram 5, so Grinding of the discharge end of the upper end of the overflow passage 54 exposed to the side becomes very easy, and the discharge end can be polished in a rounded state, so that when the ram 5 is raised to the set height, When the upper and lower discharge end of the overflow passage 54 passes through the lower o-ring 6b provided in the lower ring groove 34 of the cylinder 3, the lower o-ring 6b is not damaged. will be.

In addition, since the lower end of the ram 5 is configured to move up and down in a state in which the engaging ring 52 formed at the lower end of the through hole 51 is in contact with the outer surface of the ram support bolt 7, the ram 5 is lifted up and down. In operation it is not in contact with the inner surface of the cylinder (3).

Meanwhile, the bottom plate 2 has a hydraulic passage 23 connected to the hydraulic access hole 22 formed at the bottom of the cylinder chamber 31, and an oil access hole 23 formed at the bottom of the oil storage chamber 41. An oil passage 25 is formed to be connected. Each of the hydraulic passages 23 and the oil passages 25 is connected to a hydraulic circuit device 8a separately installed on the bottom plate 2.

The hydraulic circuit device 8a is applied to both the manual or automatic configuration of the oil generator 1, and the suction force to the oil passage 25 when the ram 5 of the oil generator 1 is raised. The oil stored in the oil storage chamber 41 is sucked into the oil passage 24 through the oil access hole 24 to discharge the hydraulic pressure into the hydraulic passage 23, and to the hydraulic passage 23. The discharged hydraulic pressure flows into the cylinder chamber 31 through the hydraulic access hole 22 to raise the ram 5, and when the ram 5 is to be raised at a predetermined height to stop the cylinder chamber ( 31 to shut off (close) the hydraulic passage 23 so that the hydraulic pressure flowing into the hydraulic access hole 22 does not flow through the hydraulic access hole 22, so that the ram 5 is stopped in the ascending operation position, and the raised ram ( 5) When lowering, open the hydraulic passage to the cylinder chamber 31. The hydraulic pressure bar is configured to be recovered to the oil passage 25 through the hydraulic passage 23 so that the oil recovered from the cylinder chamber 31 can be stored in the oil storage chamber 41 again. 8a), whether manual or automatic, is provided with a pump stand for sucking oil stored in the oil storage chamber 41 and discharging it into the cylinder chamber 31. The pump stand has a structure that is operated manually or automatically. . As an example, in the patent invention introduced in the prior art document information, the pump stage is automatically reciprocated by using the air booster to suck oil stored in the oil tank and discharge the oil into the cylinder chamber to raise the ram, A hydraulic valve device (corresponding to the hydraulic circuit device of the present invention) having a structure for lowering the ram by recovering the oil pressure introduced into the oil tank has been introduced. Therefore, in the present invention, the specific configuration of the hydraulic circuit device 8a is omitted.

And the embodiment of the present invention shown in Figure 1 was equipped with an air booster (8b) introduced in the prior art document information on the oil grinder 1 to operate the oil grinder 1 automatically, the present invention The air booster 8b applied to the air booster 8b is also similar to the air booster described in detail in the technical contents of each patent invention provided as prior art document information. Therefore, in the present invention, a specific technical configuration of the air booster 8b will be omitted, except that the air pressure for operating the air booster 8b is supplied to the oil storage chamber 41 of the oil tank 4. Only a brief description will be given.

In the present invention, when the oil compactor 1 is automatically configured using the air booster 8b, the oil stored in the oil storage chamber 41 is sucked into the hydraulic circuit device 8a when the ram 5 is raised. It should be made well so that the discharge operation of the hydraulic pressure to the cylinder chamber 31 can be made smoothly. To this end, a part of the pneumatic pressure supplied to the air booster 8b is supplied from the main pneumatic hose 81 to the upper side of the oil tank 4 in order to be able to supply the upper portion of the oil reservoir 41 of the oil tank 4. A pneumatic connector 42 is connected to the branched bypass pneumatic hose 82, and is connected to the pneumatic connector 42 inside the oil tank 4 to extend to the uppermost part of the oil storage chamber 41. The pneumatic supply pipe 43 to be installed is installed. Therefore, when the object is to be lifted by the oil reducer 1, when the air booster 8b is operated, the oil stored in the oil storage chamber 41 is automatically discharged to the cylinder chamber 31 to raise the ram 5. In this case, the pneumatic pressure supplied to the bypass pneumatic hose 82 is supplied to the upper portion of the oil storage chamber 41 through the pneumatic supply pipe 43, so that the oil stored in the oil storage chamber 41 is hydraulic circuit. The suction action to the apparatus 8a side is smoothly performed, and the hydraulic discharge action to the cylinder chamber 31 is performed well. If the oil stored in the oil storage chamber 41 is sucked into the hydraulic circuit device 8a, and if pneumatic pressure is not supplied to the upper side of the oil storage chamber 41, a vacuum pressure is generated inside the oil storage chamber 41 and oil is generated. The phenomenon that the suction to the hydraulic circuit device 8a may not be performed smoothly may occur, and the amount of hydraulic pressure discharged to the cylinder chamber 31 may also be unstable, so that the rising speed of the ram 5 may be slowed or the rising pressure may be increased. Problems such as falling off are caused. However, in the present invention, when the ram 5 of the oil generator 1 is to be automatically lifted up using the air booster 8b, a part of the high pressure supplied to the air booster 8b is transferred to the upper portion of the oil storage chamber 41. As it is supplied to as well as to increase the rising speed of the ram (5) it is possible to increase the rising pressure.

In addition, the upper side of the oil tank 4 is formed with an oil filling port 44 for replenishing oil so that the oil can be replenished when the amount of oil stored in the oil storage chamber 41 becomes insufficient. The sphere 44 has a structure which is opened or closed by the nipple 45 to be assembled.

The operation of raising and lowering the ram 5 as an embodiment in which the oil compactor 1 of the present invention configured as described above is automatically configured using the air booster 8b as shown in FIG. 1 will be described.

When the pneumatic pressure supplied from the compressor is supplied through the main pneumatic hose 81 of the air booster 8b, the air booster 8b is operated. When the air booster 8b starts operation, the oil tank ( The oil stored in the oil storage chamber 41 of 4) is sucked into the hydraulic circuit device 8a through the oil passage 25 and then discharges the hydraulic passage 23 into the hydraulic passage 23 by hydraulic pressure having a strong pressure. The operation is repeated.

Therefore, as shown in FIG. 2, when the air booster 8b operates in a state in which the ram 5 of the oil cutter 1 is completely lowered, the oil stored in the oil storage chamber 41 is stored in the oil hole 24. When the oil is sucked into the hydraulic circuit device 8a through the oil passage 25 and discharged with a strong pressure, the oil is discharged into the hydraulic passage 23. The hydraulic pressure discharged into the hydraulic passage is cylinder through the hydraulic access hole 22. It flows into the seal 31 and raises the ram 5.

As described above, the oil stored in the oil storage chamber 41 by the operation of the air booster 8b is sucked into the hydraulic circuit device 8a and then discharged into the hydraulic passage 23. Hydraulic pressure is supplied to the seal 31, whereby the ram 5 is raised.

When the ram 5 is to be stopped in the state in which the ram 5 is raised to a certain height as shown in FIG. 3, the hydraulic pressure is generated by rotating the valve operating section 83 connected to the hydraulic pressure regulating device 8a. When the hydraulic passage 23 is blocked by a ball valve (not shown) mounted on the circuit device 8a, the oil stored in the oil storage chamber 41 is no longer stored in the cylinder even when the air booster 8b is operating. While not being supplied to the chamber 31, the hydraulic pressure supplied to the cylinder chamber 31 and lifting the ram 5 is also not retained in the oil storage chamber 41 and remains in the cylinder chamber 31, thereby maintaining a predetermined height. Ram 5 is raised to support the object at a position raised to a certain height.

In addition, when the ram 5 stopped at a predetermined height is raised again as shown in FIG. 3, the hydraulic passage 23 is rotated by rotating the valve operating section 83 while the air booster 8b is operating. When opening the shut-off ball valve, as described above, the oil stored in the oil storage chamber 41 is sucked into the hydraulic circuit device 8a through the oil access hole 24 and the oil passage 25, The hydraulic pressure discharged through the passage 23 and discharged through the hydraulic passage is introduced into the cylinder chamber 31 to raise the ram 5, and the hydraulic pressure discharged into the cylinder chamber 31 flows into the cylinder chamber 31. While the ram 5 is raised to the set height by the hydraulic pressure, the locking ring 52 formed at the lower end of the ram 5 is raised along the ram support bolt 7 and thus the lower part of the ram 5 is It is to rise without contacting the inner surface of the cylinder 3, the figure of FIG. When the ram 5 is fully raised to the set height as shown in the drawing, the upper discharge end of the overflow passage 52 is in a state of communicating with the annular groove 32a through the lower oil 6b. The hydraulic pressure flowing into the overflow passage 54 from the lower portion overflows into the oil storage chamber 41 through the overflow hole 32. Accordingly, even if the oil in the oil storage chamber 41 continues to flow into the cylinder chamber 31 through the hydraulic passage 23 due to the operation of the air booster 8b, the excess hydraulic pressure overflows the overflow passage. Overflow through the overflow hole 32 through the 54 to the oil reservoir 41, the ram 5 is no longer raised in the state raised only up to the set height, the valve operation in this state When the liver 83 is rotated to block the hydraulic passage 23 and the air booster 8b is stopped, the ram 5 is stopped at a raised position to support the object.

When the ram 5 to be raised is lowered as described above, the ram 5 is opened by rotating the valve 83 only while the air valve 8b is not operated to open the hydraulic passage 23. The hydraulic pressure flowing into the cylinder chamber 31 by the load of the object supported by the oil flows into the hydraulic access hole 22 and the hydraulic circuit 23 as in the prior art, and passes through the oil pressure circuit device 8a through the oil passage. The lowering operation of the ram 5 is smoothly performed while being recovered to the oil storage chamber 41 through the oil outlet hole 25 and the lower end of the ram 5 which is lowered. 52 is in a state of sliding along the ram support bolt (7) so that the ram (5) is in contact with only the upper and lower oil (6a) (6b), not in contact with the inner surface of the cylinder (3) It will descend safely.

According to the present invention as described above, the cylinder inner diameter of the oil grinder can be manufactured by forming only a plurality of ring grooves in which upper and lower O-rings and dust seal rings are installed on the inner upper side thereof without grinding. The present invention is conventional because the outer surface is manufactured in a smooth state, the round bar material being supplied is cut to a certain length, the through-hole is drilled in the center, and the ram can be manufactured by polishing the outer diameter to check the straightness. Compared to the technology, it can not only shorten the manufacturing time of oil grinder, but also make mass production by mass production system, thereby reducing the production cost of the product. Also, it is formed on the lower side of the ram. The discharge end of the overflow passage can be cut in half when the ram is There is an effect to prevent the friction damage of the lower oil to pass through, and the present invention overflows the hydraulic fluid flowed into the oil storage chamber when the hydraulic fluid is excessively flowed into the cylinder chamber while the ram is raised to the set height By preventing the ram from rising anymore, it is possible to fully control the malfunction that the ram rises more than necessary to increase the reliability of the product as well as reduce the production cost, thereby increasing the price competitiveness of the oil compactor. That is to provide an advantage.

Claims (4)

The lower end is fixedly attached to the upper surface of the bottom plate and the upper end is installed in an open state, and formed with a larger diameter than the cylinder so that the lower end is fixedly attached to the upper surface of the bottom plate and the upper end is welded to the upper end of the cylinder An oil tank to be installed and a ram for lifting and lowering the object are installed in the cylinder chamber of the cylinder, and the bottom plate is provided with the oil entry hole formed at the bottom of the oil storage chamber of the oil tank and the cylinder. An oil passage and a hydraulic passage connected to each of the hydraulic access holes formed at the bottom of the cylinder chamber to supply the oil stored in the oil storage chamber to the cylinder chamber and to recover the hydraulic pressure introduced into the cylinder chamber to the oil storage chamber. In the oil grinder equipped, The cylinder has an upper and lower ring grooves formed at the upper and lower sides of the overflow hole formed at the upper side thereof to allow the ram to be lifted and separated from the inner surface of the cylinder, and to block hydraulic leakage. Upper and lower O-rings are installed to support the outer surface of the ram in elastic contact. The ram has a through hole formed at the center thereof, and is inserted into the ram through a screw threaded into a female screw hole formed in the bottom plate so as to be positioned at the bottom center of the cylinder chamber to guide the lifting operation of the ram. Oil grinder comprising a ram support bolt for controlling the ram to rise only up to a set height. The method of claim 1, The ram is formed in the lower end of the through-hole engaging hook engaging to the head of the ram support bolt to control to rise only up to the set height in the cylinder chamber, the lower one side is supplied to the cylinder chamber after the ram is completed An oil mill, characterized in that the overflow passage for overflowing the hydraulic pressure to the oil storage chamber through the overflow hole formed in the upper portion of the cylinder. The method according to claim 1 or 2, The ram is characterized in that the oil mill further comprises a sealing nipple for screwing the upper end of the through hole in order to prevent the leakage of the hydraulic oil through the through hole in which the ram support bolt is installed . The method of claim 1, An oil grinder comprising: a pneumatic supply pipe configured to allow the inside of the upper one side of the oil tank to inject the pneumatic pressure supplied from the outside into the upper portion of the oil storage chamber.

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