JPS6020155B2 - Hydraulic striking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to hydraulic play forces using accumulators.

Traditionally, most playing forces have been powered by gasoline engines or air compressors, but these are all extremely noisy when in use, making them impossible to use in urban areas where noise regulations are in place.

For this reason, hydraulic playing forces with less noise have been developed, but these use a hydraulic motor as the power source or directly compress a spring using hydraulic pressure. Therefore, there are limitations due to the use of these hydraulic motors or springs, such as damage due to fatigue caused by long-term use, and inconveniences and drawbacks such as the need for frequent maintenance and inspection. . The present invention provides a hydraulic breaker that does not have these inconveniences and drawbacks, but the first object of the present invention is to use an accumulator instead of a spring to create a hydraulic breaker that can withstand long-term use. The second purpose is to insert the valve into the piston and always move it together with the piston to reduce the distance the valve travels and ensure its operation.The third purpose is to Always replenish oil in the accumulator chamber,
To provide a device that circulates oil in an accumulator chamber little by little and constantly maintains the oil temperature at an appropriate temperature.

To explain in detail with reference to the drawings, reference numeral 1 denotes a hydraulic play force main body, in which an accumulator 2 is installed at the upper part, an upper cylinder 74 is bored below it;
An intermediate cylinder 3 with a slightly larger diameter is drilled, and a lower cylinder 4 with the same diameter as the upper cylinder 74 is further drilled below it, and a chisel 5 is slidably inserted into the lower end. .

An oil chamber 6, an oil chamber 7, an oil chamber 8, and an oil chamber 9 are bored in the intermediate seeder 3 sequentially from above, and the oil chamber 6 is connected to oil passages 10 and 11.
The oil chamber 7 communicates with the hydraulic pump 15 through the oil passages 13 and 14, the oil chamber 8 communicates with the oil passage 101 through the oil passage 16, and the oil chamber 9 communicates with the oil passage 13 through the oil passage 17. ing. Reference numeral 18 denotes a piston, which includes an upper small portion 75 having approximately the same diameter as the upper cylinder 74, an intermediate large portion 19 having approximately the same diameter as the intermediate cylinder 3, and a lower small light portion 2 having approximately the same diameter as the lower cylinder 4.
0, and is slidably inserted into the upper cylinder 74, intermediate cylinder 3, and lower cylinder 4.

A cylinder 21 with a closed upper end is bored in the upper part of the upper small light part 75 of the piston 18, an upper valve 22 is movably inserted into the cylinder 21, and an oil chamber 23 is formed in the lower part of the cylinder 21. An oil chamber 76 is formed between the upper flea portion 75 of the piston 18 and the intermediate cylinder portion 3;
Further, both of them are always open to the oil chamber 23 via the oil chamber 24. An axial cylinder 25 is bored inside the intermediate large sparrow portion 19 of the piston 18, and a cylinder 26 having a smaller diameter than the cylinder 25 is bored below the cylinder 25 on the same center line.
Reference numeral 28 denotes a valve inserted into the cylinder 25, and its lower part forms a conical part 29, which supports the upper end of the cylinder 26, separates from it, and connects the oil chamber 27 formed by the cylinder 26 and the lower part of the cylinder 25. The space between the oil chambers 31 is opened and closed.

The valve 28 has a diametrical oil passage 33 which communicates by an oil passage 32 with an oil chamber 30 above the valve 28 . Reference numeral 34 denotes an oil passage opened to the oil chamber 301, which opens to the oil chamber 7 when the piston 18 is at the lower limit, and opens to the oil chamber 6 when the piston 18 is at the upper limit.

Reference numeral 35 denotes an oil passage, one end of which opens to the oil passage 33 when the valve 28 is at the upper limit, and the pond end of which opens to the oil chamber 6 when the piston 16 is at the upper limit, and to the oil chamber 7 when the piston 16 is at the lower limit.

An oil chamber 36 is bored in the outer periphery of the middle large diameter portion 19 of the piston 18 from the lower middle, but the oil chamber 36 always communicates with the oil chamber 8 during operation, and is in a dry firing state, that is, when the chisel is not in use. When there is no striking object 37 at the lower end of the chisel 5 and the piston 18 is in a lowered state, the oil chamber 9 is opened. Note that the oil chamber 36 communicates with the oil chamber 31 through an oil passage 38. Reference numeral 39 denotes an oil chamber formed by the intermediate cylinder portion 3 and the lower small light portion 20 of the piston i8, and communicates with the oil chamber 27 through an oil passage 40.

Further, although the oil chamber 39 is always in communication with the oil chamber 9, the lower end of the intermediate large part 19 of the piston 18 is notched, and when the piston 18 is at the lower limit, the notch and the intermediate cylinder 3 are connected to each other. It communicates with the oil chamber 9 through an orifice 41 formed therebetween, and opens directly into the oil chamber 9 when the piston 18 rises. 42 is an oil passage whose one end is closed to the upper end of the upper M/diameter portion 75 of the piston 18 and the other end is closed to the outer surface of the upper small diameter portion 75, and the oil chamber 52 and the oil are closed only when the piston 18 is at the lower limit. Open in room 76.

The upper part of the valve 22 forms a large cylindrical part 43 with a larger diameter than the upper cylinder part 74, and below that a stepped part 44 with a diameter of 4 mm larger than the upper cylindrical part 4. When the piston 18 is at the lower limit, the large cylindrical part 43 is formed. The lower shoulder part A of the stepped part 43 hits the upper shoulder part B of the upper cylinder 74, and the lower shoulder part C of the stepped part 44 and the piston 18
When the piston 18 is in an open state and the piston 18 is at the upper limit, the upper end of the piston 18 hits the shoulder C on the lower side of the stepped part 44, the oil passage 42 is blocked, and the valve 22 is pushed up. The shoulder A on the lower side of the large diameter portion 43 and the shoulder B at the upper end of the upper cylinder 74 are opened. In addition, the oil passage 42
Not only is the upper closing portion blocked by the shoulder C, but also the side opening is blocked by the upper cylinder 74 as the piston 18 rises. A relief valve 45 is provided in an oil passage 47 leading from the accumulator chamber 46 to the tank 12.

48 is a return oil passage, 49 is a flange of the chisel 5, 5 rivers are a pin for locking the chisel, and 51 is a notch that allows the chisel 5 to move up and down a certain distance.

FIG. 2 is an enlarged view of a part of the preload valve device E shown in FIG.
The lower cylinder has a diameter smaller than 3, and both the upper and lower cylinders 53,
54 is a stepped piston 5 having a large diameter portion 55 and a small diameter portion 56.
7 in a super-moveable formation, with an oil chamber 58 above and an oil chamber 5 below.
9. An oil chamber 60 is formed in the middle part. The stepped piston 57 has an oil passage 61 opened at both upper and lower ends centered around the axis.
Further, the oil passage 61 is provided in the middle part of the large diameter part 55 in the diametrical direction.
An oil passage 62 is bored through it, and the oil passage 62 opens into a notch 63 bored all around the large ridge portion 55. A spring 64 pushes the stepped piston 57 inserted into the oil chamber 59 upward.

Reference numeral 70 denotes a projection protruding from the lower part of the oil chamber 59, which sets the lower limit of the stepped piston 57.

Reference numeral 71 denotes an oil passage leading to the accumulator chamber 46, and the oil chamber 73, which is closed to the upper cylinder 53 at the end thereof, is always connected to the notch 6.
It opened on 3rd.

Reference numeral 72 denotes an oil passage, one end of which communicates with the oil passage 13, and the other end of which is closed into the notch 63 when the piston 57 is at its upper limit, that is, when no oil pressure is applied to the oil chambers 58, 59.

68 is an oil passage that is always open to the oil chamber 6, and the oil chamber 6 and the oil passage 10
, 11 to the tank 12, and the oil passage 68 has a check valve 69 so that oil flows only in the direction of the tank 12.
is installed.

Note that 65 is a rubber membrane of the accumulator 2, 66 is the bottom of the accumulator 2, and 67 is a gas supply port of the accumulator 2. Although the present invention is configured as described above, a case in which it actually operates will be explained.

In Figure 1, the chisel 5 is pressed against the object 37 to be struck, and the tsuba 49
is in contact with the lower end of the main body 1 and pressure is not generated in the hydraulic pump 15 before starting work. The piston 18 has descended and its lower end is in contact with the upper end of the chisel 5, and the hydraulic pump 15 side is in contact with the lower end of the main body 1. The oil chamber 7 communicates with the oil passage 34, the oil chamber 9 communicates with the oil chamber 39 via the orifice 41, and the oil chamber 6 on the tank 12 side communicates with the oil passages 42, 24 via the oil chamber 76, and the oil chamber 8. The valves 28 are lowered so that the conical portion 29 at the tip is in contact with the upper end of the cylinder 26. If the hydraulic pump 15 is operated, the oil will flow through the oil passage 14,
13, oil chamber 7, oil passage 34 to oil chamber 30, and oil passage 17, oil chamber 9 to oil chamber 39 via orifice 41, but since the latter circuit has orifice 41, oil chamber 30
Oil flows in one step ahead and acts on the upper end surface of the valve 28, reliably pressing the conical portion 29 at the lower end against the upper end of the oil hole 26, thereby blocking the connection between the oil chamber 27 and the oil chamber 31. orifice 41
Pressure oil flows into the oil chamber 39 through the oil passage 40 and into the oil chamber 27 through the oil passage 40, and hydraulic pressure acts on the valve 28 from below. Since the pressure receiving area is larger than the pressure receiving area acting on the joint portion of the valve 28, the piston 18 is raised by the action of the pressure oil acting on the lower end of the intermediate large diameter portion 19 while the valve 28 is pressed against the oil hole 26. When the piston 18 rises, the oil passage 42 and the oil chamber 76 are cut off, and the oil chamber 52 is sealed. When the piston 18 further rises, the upper valve 22 is raised, and the oil escapes into the accumulator chamber 46 through between the shoulders A and B at the lower end of the large diameter portion 43. When the piston 18 further rises, the upper end of the piston 18 hits the shoulder C of the upper valve 22, the upper end of the oil passage 42 is closed, and the upper valve 22 is pushed up. On the other hand, oil line 3
4 and 35, when the piston 18 rises, the oil passage 35 first communicates with the oil chamber 6, and the oil passage 34 and the oil chamber 7 are cut off, thereby sealing the oil chamber 30. Since the oil chamber 30 is sealed, the valve 28 will not open between the oil chamber 27 and the oil chamber 31 until the piston 18 reaches the upper limit and the seal is released. When the piston 18 further rises and reaches the upper limit, the oil passage 34 opens to the oil chamber 6, and the oil chamber 30 communicates with the tank 12 via the oil passage 34, the oil chamber 6, and the oil passages 10 and 11, and the oil pressure decreases. However, the valve 28 is pushed up by the pump hydraulic pressure that raises the piston 18 that reaches the oil chamber 27 from the oil chamber 39 through the oil path 40, and the accumulator hydraulic pressure added to this, and the oil chamber 27 is moved up to the oil chamber 31. The oil from the hydraulic pump 15 returns to the tank 12 via the oil passage 38, the oil chamber 36, the oil chamber 8, and the oil passages 16, 10, and 11. piston 1
The oil pressure in the oil chamber 39 that pushed up the oil chamber 39 decreases, and the oil chamber 39 communicates with the tank 12. oil to the oil passage 40, oil chambers 27, 31,
It rapidly descends while sending oil to the oil passage 38, oil chambers 36, 8, oil passage 16, and oil chambers 6, 76, and the object 3 to be struck via the chisel 5.
Add a blow to 7. The upper valve 22 pushes the piston 18 and descends, but the lower shoulder part A of the large light part 43 touches the cylinder 7.
The oil chamber 52 at the upper end of the piston 18 expands its volume as oil flows in from the oil passage 42 opened to the oil chamber 76. . When the piston 18 reaches the lower limit, the oil passage 34 closes to the oil chamber 7.
Since the oil chamber 9 is connected to the oil chamber 39 through the orifice 41 and is in a constricted state, the oil from the hydraulic pump 15 flows into the oil chamber 301 before flowing into the oil chamber 39, and the oil chamber 9 flows into the oil chamber 301 through the oil chamber 39 through the orifice 41. The oil is pressed against the oil hole 26 to block the connection between the oil chamber 27 and the oil chamber 31, and then flows into the oil chamber 39 through the orifice 41 and pushes up the piston 18.

Thus, as previously mentioned, the piston and upper valve 22
rises and stores energy in the accumulator. In this way, the oil from the hydraulic pump 15 first enters the oil chamber 30, presses the valve 28 downward to close the oil chamber 27, and then enters the oil chamber 39, pushing the piston 18 upward together with the upper valve 22, and presses the valve 28 downward to close the oil chamber 27. 2 stores energy, and connects the oil chamber 30 above the valve 28 to the tank 12 at the upper limit,
Opening the valve 28 with pressure oil acting on the lower end of the valve 28,
The pump 15 is passed through the tank 12, and the piston 18 is rapidly lowered by the energy stored in the accumulator 2 to perform a striking action.

Note that the accumulator chamber 46 includes the piston 18 and
The oil chamber 5 is opened by the pump action caused by the vertical movement of the upper valve 22.
2 is sent into the accumulator chamber 46, but if the oil pressure in the chamber 46 rises above a certain value, a part of the oil opens the relief valve 45 and returns to the tank 12 via the oil path 48, and is returned to the accumulator chamber 46. The oil is replaced little by little to prevent the oil temperature from rising. Further, the accumulator 2 is filled with nitrogen gas at a predetermined pressure, for example, 30 k9/m, but the accumulator chamber 46 is filled with a pre-pressure of a certain limit, for example, 4
If there is no pressure at 0k9', the rubber membrane 65 of the accumulator will hit the bottom 66 during operation, and the rubber membrane 65 will be easily damaged.

The preload valve device E is provided to avoid this, and when there is no oil at a constant pressure in the accumulator chamber 46, the oil from the hydraulic pump 15 is
3. Enters the accumulator chamber 46 through the oil passage 62, notch 63, oil chamber 73, and oil passage 71. When the oil pressure in the oil chamber 46 reaches a certain value, for example, 40k9', the oil chamber 58 communicating with the accumulator chamber 46 from the oil passage 62 via the oil passage 61 opens.
, 59 also increases, and the stepped piston 57 descends against the spring 64 due to the difference in area between its upper and lower ends, and although the oil chamber 73 and the notch 63 communicate, the oil passage 67 and the notch 63 are blocked. The four accumulator chambers are then closed and maintained at the constant oil pressure (40 kg/). In this way, a certain preload is secured in the accumulator chamber 46, and the rubber membrane 65 is held at the position shown by the chain line as shown in FIG.
5 will not be damaged. As mentioned above, since the present invention uses an accumulator and does not use a spring,
There is no damage due to fatigue even when used for long periods of time, so there is no need to replace parts, which improves work efficiency and has great economic effects.

In addition, the valve for switching the supply oil path for pressurized oil that pushes up the piston is housed inside the piston so that it moves together with the piston, which allows the valve to be made smaller and eliminates valve movement. This allows the aircraft to be made more compact and its lifespan to be extended.

In addition, since a small amount of oil is always supplied to the accumulator evening chamber to circulate the oil in the oil chamber, the temperature rise is small even when the accumulator is used for a long time, and the function of the accumulator is reduced. There's nothing to do.

In addition, since the present invention automatically applies a constant pre-pressure to the accumulator chamber, there is no need for special operations even if work has been stopped for a long time, and the accumulator chamber maintains a constant pressure. Since it automatically rises to prevent damage to the rubber membrane, there is no need to perform any special operations at the start of work, and there is no possibility that the rubber membrane will be damaged due to forgetting to operate it.

Furthermore, when a variable displacement hydraulic pump is used as a hydraulic pump, there is an advantage that the relationship between pressure and flow rate can be freely changed to select either the number of strikes or the energy of strikes.

In other words, when attempting to increase the number of strikes, the set pressure of the relief valve is lowered to increase the flow rate, thereby increasing the amount of oil supplied and increasing the number of strikes. On the other hand, when trying to increase the impact energy, the set pressure of the relief valve is increased. Since the hydraulic pressure in the accumulator chamber increases, the striking force during operation increases.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1, FIG. 3, and FIG. 4 are all longitudinal cross-sectional views of the present invention, and FIG. 2 is a partially enlarged view of FIG. 1. 1... Body, 2... Accumulator,
3...Middle cylinder, 4...Lower cylinder, 5
... Chisel, 12 ... Tank, 15 ... Hydraulic pump, 18 ... Piston, 19 ... Middle large flea part, 2
0...Lower small diameter part, 22...Upper valve, 28...Valve, 30...Oil chamber, 38...
...Oil passage, 39...Oil chamber, 40...Oil passage, 41...Orifice, 42...Oil passage, 45...Relief Valve, 46...Accumulator chamber, 52...Oil chamber, 71, 72.
...Oil road. ※'1 Juogizu figure Shio J Atsushi *4 figure

Claims (1)

[Scope of Claims] 1. A main body in which a chisel is attached to the lower part, cylinders of different diameters are bored inside, and the cylinders are connected to a hydraulic pump and a tank, and the main body is attached to the upper part of the main body so as to communicate with the cylinder part. The accumulator is connected to a constant hydraulic pump and is connected to a tank via a relief valve, and is inserted into the cylinder part of the main body, with the upper and lower parts having a small diameter, the middle part having a large diameter, and the lower part having a small diameter. A piston having an oil passage formed from the piston to the intermediate large diameter part, a valve that is inserted into the piston and opens and closes the oil passage connecting the lower small diameter part and the intermediate large diameter part, and a piston that is installed between the piston and the accumulator. A hydraulic impact device comprising an upper valve which operates in accordance with the movement of the oil tank and replenishes oil from a tank to an accumulator. 2. The hydraulic striking device according to claim 1, wherein the oil chamber at the upper end of the lower small diameter portion of the piston is configured to communicate with the hydraulic pump via an orifice when the piston is at the lower limit. 3. A patent claim in which the oil chamber at the upper end of the valve that is inserted into the piston and controls the pressure oil that raises the piston is configured so that it communicates with the tank when the piston is at the upper limit and communicates with the hydraulic pump when it is at the lower limit. Hydraulic impact device according to scope 1. 4 An oil chamber is formed between the piston and a valve mounted on the upper part thereof, and an oil passage for guiding the oil chamber to the tank is formed in the upper part of the piston, and the oil chamber and the accumulator are connected by the valve according to the movement of the piston. Alternatively, the hydraulic impact device according to claim 1, which is configured to selectively open and close between the oil passages. 5. In a hydraulic impact device consisting of a main body, an accumulator installed above the main body, a piston operated by the accumulator and pump hydraulic pressure, and a valve that controls the operating hydraulic pressure, the pump is connected to the accumulator chamber where an external force acts on the accumulator. A hydraulic impact device configured to provide a constant preload to the accumulator chamber through an oil passage.