KR101824717B1 - Accumulator of the hydraulic breaker - Google Patents

Abstract

The present invention relates to an accumulator of a hydraulic breaker. An object of the present invention is to prevent damages to a diaphragm by having a hydraulic chamber of an accumulator not sealed even when an abnormal phenomenon occurs within a gas chamber of the accumulator. The accumulator of a hydraulic breaker comprises: an accumulator body (210); an accumulator cover (220); the diaphragm (230); a valve for charging gas; and a sealing member (240).

Description

[0001] ACCUMULATOR OF THE HYDRAULIC BREAKER [0002]

The present invention relates to a hydraulic breaker, and more particularly, to a hydraulic breaker wherein an abnormality in a gas chamber of an accumulator (such as an overfilling of a back-head nitrogen gas or a setting error, etc.) The present invention relates to an accumulator of a hydraulic breaker that prevents damage to a diaphragm by preventing a hydraulic chamber of an accumulator chamber from being hermetically closed,

The hydraulic breaker is a device that transmits kinetic energy generated by up and down reciprocating motion of a piston to a chisel to crush a pit explosion.

FIG. 1 is a structural view for explaining the operation principle of a hydraulic breaker in which an accumulator is not used. When hydraulic oil discharged from a pump 1 is supplied to a cylinder chamber 2 through a second flow path F2, The rising stroke of the piston 3 is started. At this time, a high pressure is formed by the operating oil supplied from the pump 1 and the valve switching chamber 5 is connected to the cylinder low pressure chamber 7 connected to the working oil tank 6 by the seventh flow path F7. So that a low pressure is formed. Therefore, the working oil of the cylinder-lowering chamber 9 is communicated with the fifth flow path F5 connected to the working oil tank 6 through the third flow path F3, so that the low pressure is maintained. Thereafter, when the piston 3 continues to rise and the lower pressure receiving surface (lower surface of the lower large diameter portion PL) of the piston reaches the cylinder switching chamber 8, the cylinder chamber 2 connected to the pump 1 is returned to the cylinder switching chamber 8 and communicates with the valve switching chamber 5 through the seventh flow path F7 and the valve switching chamber 5 is formed with the same high pressure as the valve opening 4. At this time, the valve is switched so that the first flow path F1 and the third flow path F3 are communicated with each other, and the cylinder chamber 9 is connected to the cylinder chamber 2 ) Is formed. At this time, since the area of the upper hydraulic pressure surface of the piston (the upper surface of the upper large-diameter portion PU) is larger than the area of the lower pressure receiving surface of the piston (lower surface of the lower large-diameter portion PL) And the descending stroke starts. At this time, the piston 3 has potential energy in the cylinder conversion chamber 8 where the descending stroke starts. The potential energy of the piston 3 is converted into kinetic energy until the piston 3 starts to descend and immediately before the piston 3 comes into contact with the chisel 10, The kinetic energy is converted into impact energy, that is, a striking force, which is transmitted to the pit boat through the chisel 10. At this time, when the upper surface of the lower large-diameter portion PL passes the cylinder switching chamber 8, the valve switching chamber 5 is communicated with the cylinder low-pressure chamber 7 connected to the tank 6 by the seventh flow path F7, The valve is returned and the third flow path F3 is communicated with the fifth flow path F5 connected to the tank 6 so that the pressure of the cylinder lid 9 is lowered and the piston 3 is raised again.

In this way, the hydraulic breaker repeats the ascending and descending strokes to transfer the impact energy to the pit stop and crush the pit stop. This crushing operation is performed by the rising stroke and the descending stroke of the piston. In the piston rising stroke, since the high pressure side operating pressure continuously rises and the piston moves down at a very high speed during the descending stroke of the piston, The difference between the maximum pressure at the time of the rising stroke and the minimum pressure at the time of the descending stroke becomes very large. Such a large fluctuation of the working pressure on the high pressure side is transmitted to the equipment including the excavator and the hydraulic breaker in the form of an impact. If such shock is continuously transmitted, it may shorten the life of various parts.

FIG. 2 shows an example of a pressure waveform formed at the high-pressure portion when the hydraulic breaker with no accumulator is operated. It can be seen that the pressure fluctuation width at the start of the descending stroke and at the end of the descending stroke in the illustrated waveform is very large.

On the other hand, when the strength of the concrete or the rock is strong or there is foreign matter, the hydraulic pressure changes momentarily, or the hydraulic pressure changes greatly due to the malfunction of the pump or the valve or the occurrence of the pulsating wave. Since the hydraulic device or the hydraulic line is likely to be broken if an instantaneous change in the hydraulic pressure occurs, an accumulator that performs a damping action in response to a change in the hydraulic pressure is applied.

FIG. 3 is a general operating structure diagram of a hydraulic breaker to which an accumulator is applied, in which the accumulator 100 is shown. The accumulator is divided into a hydraulic chamber 101 and a gas chamber 102 by an intermediate diaphragm 130 and the hydraulic chamber 101 is connected to a second flow path F2 And the gas chamber 102 is generally filled with nitrogen (N ₂ ) at a level of 40 to 70 bar. The diaphragm 130 is generally made of an elastic material such as rubber or polyurethane. In order to smoothly operate the diaphragm 130, the portion of the diaphragm 130 that is assembled to the body of the accumulator 130 and the cover is made thinnest, It is made thickest.

The hydraulic fluid discharged from the pump 1 is supplied to the cylinder chamber 2 via the second flow path F2 and is also supplied to the hydraulic chamber 101 of the accumulator 100 via the accumulator flow path 103. [ When the hydraulic fluid discharged from the pump 1 is supplied to the cylinder chamber 2 and the pressure of the cylinder chamber 2 is raised, the piston 3 starts to be lifted up and supplied to the hydraulic chamber 101 of the accumulator 100 The pressure of the hydraulic chamber 101 is also raised by the operating oil. At this time, a high pressure is formed by the operating oil supplied from the pump 1, and the valve switching chamber 5 is connected to the cylinder low pressure chamber 7 connected to the working oil tank 6 by the seventh flow path F7 So that a low pressure is formed. Accordingly, the operating fluid of the cylinder-lowering chamber 9 is kept at a low pressure by communicating the third flow path F3 with the fifth flow path F5 connected to the tank 6. The operating pressure of the high pressure side is increased and the pressure of the accumulator 100 is also increased as the piston 3 is continuously raised so that the pressure of the hydraulic chamber 101 of the accumulator 100 is lowered to the gas chamber of the accumulator 100 The diaphragm 130 starts to operate and the pressure of the hydraulic chamber 101 of the accumulator 100 is continuously increased so that the diaphragm 130 is moved to the inside of the gas chamber 102 of the accumulator 100 The pressure in the gas chamber 102 rises in a direction in which the nitrogen gas is compressed. That is, when the diaphragm 130 compresses the nitrogen gas in the gas chamber 102, the pressure of the hydraulic chamber 101 and the gas chamber 102 of the accumulator 100 become equal to each other. Accordingly, the diaphragm 130 operates in the direction of compressing the gas chamber 102 as the pressure of the hydraulic chamber 101 of the accumulator 100 becomes higher. As a result, the diaphragm is moved to the gas chamber 102 in the hydraulic chamber 101 of the accumulator 100, The working oil is filled up by the space in which the piston 102 is compressed. When the piston 3 continues to rise and the lower surface of the lower large-diameter portion PL reaches the cylinder conversion chamber 8, the cylinder chamber 2 connected to the pump 1 is returned to the seventh channel via the cylinder conversion chamber 8, The valve switching chamber 5 is communicated with the valve switching chamber 8 through the valve F7 and a high pressure such as the valve loss chamber 4 is formed. At this time, since the hydraulic pressure area of the valve switching chamber 5 is larger than the valve loss, the valve is switched so that the first flow path F1 and the third flow path F3 are communicated with each other. A high pressure is formed. At this time, since the upper surface of the upper large-diameter portion PU is larger in pressure receiving area than the lower surface of the lower large-diameter portion PL, the rising stroke of the piston 3 is stopped and the descending stroke starts. At this time, the piston 3 has potential energy in the cylinder conversion chamber 8 where the descending stroke starts. When the piston 3 starts to descend, the lowering motion is performed at a very high speed. As a result, the operating pressure of the high pressure side is lowered. As the high pressure side operating pressure falls, the second flow path F2 The pressure of the hydraulic chamber 101 of the accumulator 100 communicated with the accumulator channel 103 also falls and the diaphragm 130 compressing the gas chamber 102 moves in the direction of the hydraulic chamber 101. As the diaphragm 130 moves in the direction of the hydraulic chamber 102, the hydraulic fluid filling the hydraulic chamber 102 is supplied to the second flow path F2 through the accumulator flow path 103. In this accumulator 100, The lowering width of the operating pressure on the high pressure side is reduced due to the operating oil supplied from the hydraulic chamber 101 to the second flow path F2. Thereafter, the descending stroke of the piston 3 advances and the piston 3 strikes the chisel 10, so that the descending stroke of the piston 3 is finished. However, until the descending stroke of the piston 3 is finished, The pressure of the accumulator 100 is lowered so that the diaphragm 130 moves in the direction of the oil pressure chamber 101 and the hydraulic fluid filled in the oil pressure chamber 101 flows into the accumulator flow path 103 And the pressure of the gas chamber 102 of the accumulator 100 is also lowered. At this time, when the upper surface of the lower large-diameter portion PL passes the cylinder switching chamber 8, the valve switching chamber 5 is communicated with the cylinder low-pressure chamber 7 connected to the tank 6 by the seventh flow path F7, The valve is returned and the third flow path F3 is communicated with the fifth flow path F5 connected to the tank 6 so that the pressure in the cylinder laden chamber 9 is lowered, The working oil is supplied to the oil pressure chamber 101 of the accumulator 100 again and the pressure of the oil pressure chamber 101 is raised.

In this way, when the piston is moved upwardly, the operating pressure of the high-pressure side is continuously increased, and at the same time, the pressure of the accumulator The pressure of the oil pressure chamber 101 of the accumulator 100 is also lowered while the pressure of the accumulator 100 is lowered due to the high speed of the piston in the descending stroke of the piston, The working oil that has filled the valve 101 is supplied to the high pressure side to attenuate the width of the pressure drop.

This reduction in the fluctuation range of the high-pressure side working pressure can attenuate the impact transmitted to the equipment including the excavator and the hydraulic breaker, thereby improving the service life of various parts.

FIG. 4 shows an example of the pressure waveform formed at the high-pressure portion during operation of the hydraulic breaker to which the accumulator is applied. It can be seen that the pressure fluctuation width at the start of the descending stroke and at the end of the descending stroke in the illustrated waveform is greatly reduced in comparison with the operation of the hydraulic breaker in which the accumulator is not used.

Figure 5 shows a typical accumulator configuration applied to a hydraulic breaker. On the left side, the components to be assembled are exploded and the assembly is shown on the right side. As components to be assembled, an accumulator body 110, an accumulator cover 120, a diaphragm 130, a gas filling valve 140, an O-ring 150, a backup ring 160, and a bolt 170 are used .

FIG. 6 shows an example of a shape in which an accumulator is assembled to a hydraulic breaker, and FIG. 7 shows a cross-sectional view of an example of an accumulator applied to a hydraulic breaker. The accumulator 100 is mounted on the hydraulic breaker by means of a bolt or the like and the leakage of hydraulic oil is blocked by the O-ring 150 and the backup ring 160 on the assembly surface of the hydraulic breaker and the accumulator 100. In the initial state before the operation of the hydraulic breaker, nitrogen gas is filled in the gas chamber 102 of the accumulator 100 at a pressure of 40 to 70 bar. Since the hydraulic breaker is not operated, no pressure is formed on the high pressure side. It can be confirmed that the hydraulic pressure is being pushed toward the accumulator hydraulic chamber 101.

Fig. 8 shows an example of a shape in which a normal diaphragm operates when the piston-up stroke of the hydraulic breaker is operated. The working oil discharged from the pump 1 is supplied to the cylinder chamber 2 and the piston 3 is moved upward to increase the working pressure on the high pressure side and at the same time from the second flow path F2, The working oil flows into the accumulator oil pressure chamber 101 via the oil line 103 and the pressure is increased similarly to the high pressure side. As the pressure of the accumulator hydraulic chamber 101 rises, the diaphragm 130 moves in the direction of the gas chamber 102, compressing the nitrogen gas in the gas chamber 102, and the pressure of the gas chamber 102 is increased. 8, when the piston is lifted up, the diaphragm 130 is operated so that pressure is balanced between the oil pressure chamber 101 and the gas chamber 102. When the piston is lifted up, And the operating oil flows into the oil pressure chamber 101 as much as the space of the oil pressure chamber 101 in which the diaphragm 130 moves in the direction of the gas chamber 102.

9 shows an example of a shape in which a normal diaphragm 130 operates when the piston descent stroke of the hydraulic breaker is operated. When the upward stroke of the piston is completed and the valve is switched, the cylinder overflow chamber 9 communicates with the high-pressure flow passage such as the cylinder chamber 2, and the descending stroke of the piston 3 starts. When the descending stroke of the piston 3 is started, the operating pressure of the high pressure side is lowered and therefore the pressure of the accumulator oil pressure chamber 101 is also lowered so that the diaphragm 130 moves from the gas chamber 102 to the oil pressure chamber 101 At this time, the hydraulic fluid filled in the hydraulic chamber 101 flows into the high-pressure side via the accumulator flow path 103, and the pressure drop width of the high-pressure side working pressure is reduced. At this time, the descending stroke of the piston is completed in a very short time because the descending speed of the piston at the piston descending stroke is very fast compared with the rising speed at the piston ascending stroke. Therefore, the piston descending stroke The rise in pressure is similar to the fall in the piston descent stroke, which lasts for a very short time compared to the lift stroke. Accordingly, under normal operating conditions of the hydraulic breaker, the diaphragm 130 returns to its initial position when the piston descent stroke is completed, and the state in which the diaphragm 130 returns to the initial state is shown in FIG.

Fig. 10 shows an example of a shape in which an abnormal diaphragm operates when the piston descent stroke of the hydraulic breaker is operated. To increase the output during hydraulic breaker operation, the blow energy can be artificially increased. The most common example is filling the back head with nitrogen gas exceeding the recommended value. In order to increase the striking energy, the speed of the piston must be increased. When the filling pressure of the nitrogen gas in the back head is increased, the working pressure on the high pressure side is increased and the downward force acting on the piston upper- Energy is increased. This increase in the high pressure side operating pressure means an increase in the pressure in the accumulator hydraulic chamber 101. This means that the hydraulic chamber 101 is filled with more hydraulic fluid and the diaphragm 130 further compresses the gas chamber 102, ) Is also increased. Further, the increase in the piston descending speed means that the pressure decreasing speed in the piston descent stroke is increased, which means that the hydraulic fluid is also supplied from the accumulator hydraulic chamber 101 to the second flow path F2 quickly, The quick supply of the diaphragm 130 means that the diaphragm 130 must operate quickly. When the hydraulic fluid from the accumulator hydraulic chamber 101 quickly flows out to the second flow path F2, the hydraulic fluid in the vicinity of the accumulator flow path 103 flows first through the accumulator flow path 103 through the second flow path The operation speed of the center of the diaphragm 130 becomes abnormally high and the bottom surface of the central portion of the diaphragm 130 may be in contact with the inner surface of the hydraulic chamber 101 . In this case, the communication between the accumulator flow passage 103 and the second flow passage F2 is cut off and the hydraulic chamber 101 is closed, and at the same time, the hydraulic pressure The operating oil in the chamber 101 is pushed in the lateral direction of the hydraulic chamber 101 while being unable to be supplied to the second flow path F2 via the accumulator flow path 103. As a result, . Further, when the gas chamber 102 is filled with nitrogen gas at a pressure higher than that of the winding apparatus due to the setting error, the amount of compression of the gas chamber 102 by the diaphragm 130 due to an increase in the operating pressure in the piston rising stroke is reduced The amount of the hydraulic fluid filled in the hydraulic chamber 101 decreases and the speed at which the diaphragm 130 operates in the direction of the hydraulic chamber 101 from the gas chamber 102 during the piston down stroke is increased, A situation may occur in which the pressure of the side surface of the hydraulic chamber 101 rises while the accumulator flow path 103 is closed by contacting the inner surface of the hydraulic chamber 101 of the accumulator 100.

11 shows an example in which the diaphragm shape is deformed when the pressure of the side surface portion of the hydraulic chamber 101 that is hermetically closed by the abnormal diaphragm operation during the piston down stroke of the hydraulic breaker is raised. When the pressure of the side portion of the sealed hydraulic chamber 101 is increased, the thinnest portions A and B of the diaphragm 130 are most extended. If the pressure rise is insignificant, The diaphragm 130 is stretched so that the diaphragm 130 is stretched beyond the elastic limit of the material applied to the diaphragm 130 when the pressure rise level is considerable, A non-returning plastic deformation occurs. In the operation of the hydraulic breaker, the plastic deformation of the diaphragm 130 continues due to the occurrence of the hermetically sealed state of the hydraulic chamber 101. If the diaphragm 130 exceeds the limit of the material of the diaphragm 130, damage or breakage occurs in the thinnest portions A and B , The nitrogen gas in the gas chamber 102 is discharged through the damaged portion, so that the function of the accumulator 100 can no longer be properly performed.

Korean Patent No. 10-1125597

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of controlling an internal combustion engine in which an abnormal phenomenon in a gas chamber of an accumulator (nitrogen gas filling, Which prevents the diaphragm from being damaged by preventing the hydraulic chamber of the accumulation chamber from being closed even when the hydraulic pressure in the accumulator chamber is generated.

The accumulator of the hydraulic breaker according to the present invention includes an accumulator body provided with a accumulator flow path in a bottom portion thereof and having a groove opened toward one side thereof, and an accumulator body installed in the main body of the hydraulic breaker, A diaphragm installed in an internal space formed by assembling the accumulator body and the accumulator cover to divide the space into a hydraulic chamber and a gas chamber, A gas filling valve installed in the cover, and a sealing member provided between the accumulator body and the hydraulic breaker body to constitute an accumulator for buffering the hydraulic pressure, and is formed by reciprocating movement of the piston in the cylinder upward and downward Accumulator of a hydraulic breaker that blows a chisel with kinetic energy and crushes the pita explosion with impact energy converted through a chisel Standing,

The diaphragm is formed so as to connect the bottom surface and the side surface of the accumulator body to at least one of the diaphragm and the accumulator body of the accumulator so that even if the bottom surface of the diaphragm contacts the bottom surface of the accumulator body, And a communicating means for preventing an upward movement.

The communication means is any one of a communication slot formed on the bottom surface of the diaphragm, a communication protrusion, a communication piece, or a communication slot formed in the accumulator body.

According to the accumulator of the hydraulic breaker of the present invention, even if nitrogen gas is filled in the back head in excess of the recommended value or nitrogen gas of a pressure higher than that of the rolling device is filled in the gas chamber of the accumulator due to a setting error, It prevents the malfunction of the hydraulic breaker by preventing damage or breakage due to plastic deformation of the diaphragm by preventing the diaphragm from being sealed, and also prevents damage to the cylinder and piston due to damage or breakage of the diaphragm. .

1 is an exemplary view showing a general operating structure of a hydraulic breaker in which an accumulator is not used;
2 is an illustration of an operating pressure waveform of a hydraulic breaker in which an accumulator is not used;
Fig. 3 is an illustration of a general operating structure of a hydraulic breaker to which an accumulator is applied. Fig.
4 is an illustration of an example of a hydraulic breaker operating pressure waveform to which an accumulator is applied;
Fig. 5 is an illustration of an accumulator shape applied to a hydraulic breaker. Fig.
6 is an exemplary view of a shape in which an accumulator is assembled to a hydraulic breaker.
7 is a sectional view of an example of an accumulator applied to a hydraulic breaker.
8 is an exemplary view of a shape in which a normal diaphragm operates during a piston-up stroke of a hydraulic breaker;
Fig. 9 is an exemplary view of a shape in which a normal diaphragm operates when the piston-down stroke of the hydraulic breaker is operated. Fig.
10 is an exemplary view of a shape in which an abnormal diaphragm operates during a piston down stroke of a hydraulic breaker.
11 is an example of diaphragm shape deformation caused by an abnormal diaphragm operation in a piston down stroke of a hydraulic breaker.
Fig. 12 is an illustration of an example of a diaphragm shape due to an abnormal operation of the diaphragm according to the first embodiment of the present invention during a piston down stroke of the hydraulic breaker; Fig.
13 is a perspective view and a cross-sectional view of a diaphragm according to the first embodiment of the present invention.
Fig. 14 is an exemplary diagram of a diaphragm shape due to an abnormal operation of a diaphragm of another shape according to the second embodiment of the present invention during a piston down stroke of the hydraulic breaker; Fig.
15 is a perspective view and a cross-sectional view of a diaphragm according to a second embodiment of the present invention;
Figure 16 is another example of a diaphragm shape according to a third embodiment of the present invention;
17 is another example of a diaphragm shape according to a fourth embodiment of the present invention.
18 is an illustration of an accumulator body shape according to a fifth embodiment of the present invention.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

As shown in FIG. 12, the hydraulic breaker according to the present invention strikes the chisel with the kinetic energy generated through the reciprocating movement of the piston in the cylinder, crushes the pit explosion with the impact energy converted through the chisel, Since the operation of the hydraulic system is the same as that of a conventional axial pressure type hydraulic breaker, detailed description thereof will be omitted, and the communication means and the accumulator related to the present invention will be described in detail.

The accumulator 200 has a structure in which a groove opened toward one side is formed and an accumulator flow path 211 communicating with the second flow path F2 of the hydraulic breaker is provided at the bottom portion of the accumulator 200, An accumulator cover 220 having a groove opened toward the accumulator body 210 and assembled to the accumulator body 210 through a bolt 212, an accumulator body 210, A diaphragm 230 installed in a space formed by assembling the accumulator cover 220 and partitioning the space into a hydraulic chamber 201 and a gas chamber 202, A valve, and a sealing member 240 installed between the accumulator body 210 and the hydraulic breaker body.

The diaphragm 230 is made of an elastic material such as rubber or polyurethane so that the portion of the diaphragm 230 to be assembled to the accumulator body 210 and the accumulator cover 220 It is made thin and the center part is made thick.

As shown in FIG. 13, the diaphragm 230 is provided with a communication means for preventing the hydraulic chamber 201 from being closed by forming a space between the diaphragm 230 and the inner surface of the accumulator body 210, The communication slots 231 are provided.

The communication slots 231 are integrally formed on the bottom surface of the diaphragm 230 so as to be opened toward the bottom surface of the accumulator body 210 and are formed in the shape of a groove communicating with the hydraulic chamber on both sides in the longitudinal direction, Even if the bottom surface contacts the bottom surface of the accumulator body 210, the communication slot 231 does not contact the bottom surface of the accumulator body 210 to prevent the sealing of the hydraulic chamber 201.

At least one communication slot 231 is formed at a position corresponding to the accumulator flow path 211. Further, the communication slot 231 is not limited to one direction but may have various shapes such as a cross shape.

12 shows a diaphragm shape due to an abnormal operation of the diaphragm according to the first embodiment of the present invention when the piston of the hydraulic breaker is lowered. As described above, the back head gas pressure exceeds the recommended value Or when the gas chamber 202 of the accumulator 200 is filled with nitrogen gas at a pressure higher than that of the winding apparatus due to a setting error, the pressure in the piston descending stroke due to the increase in the piston descending speed at the piston descending stroke The operating oil flows from the oil pressure chamber 201 of the accumulator 200 to the high pressure oil line at a high speed so that the operating speed of the center portion of the diaphragm 230 becomes abnormally high, A situation may occur in which the inner surface of the outer casing 201 is in contact with the inner surface of the casing 201. Even if the bottom surface of the central portion of the diaphragm 230 is in contact with the inner surface of the hydraulic chamber 201, the hydraulic oil in the side of the hydraulic chamber 201 is communicated with the accumulator passage 211 through the communication slot 201, The pressure in the side surface of the hydraulic chamber 201 is prevented from rising to prevent the diaphragm 230 from being damaged.

Hereinafter, another embodiment of the diaphragm communication means for achieving the object of the present invention will be described.

≪ Communication protrusion type communicating means >

15, the communicating means may be arranged in a direction transverse to the bottom surface of the diaphragm 230, and one or more communicating protrusions 232 may be provided on the bottom surface of the diaphragm 230 to protrude downward.

The communication protrusions 232 can be various shapes such as a straight line shape, a cross line shape, and a plurality of dot shapes.

FIG. 14 is a diagram showing a diaphragm shape due to an abnormal operation of a diaphragm of another shape according to the second embodiment of the present invention when the piston of the hydraulic breaker is lowered. In order to increase the striking energy, When the gas chamber 202 of the accumulator 200 is filled with nitrogen gas at a pressure higher than that of the winding apparatus due to filling or setting error, the pressure drop in the piston descending stroke due to the increase in the piston descending speed at the piston descending stroke The operating oil rapidly flows from the hydraulic chamber 201 of the accumulator 200 to the high-pressure oil line, thereby causing the operating speed of the central portion of the diaphragm 230 to abnormally increase, and the bottom surface of the center portion of the diaphragm 230, A situation may occur where the inner surface of the oil pressure chamber 201 of the oil pan 200 is in contact with the inner surface of the oil pressure chamber 201. 14, even when the operating speed of the central portion of the diaphragm 230 becomes abnormally high and the bottom surface of the central portion of the diaphragm 230 contacts the inner surface of the hydraulic chamber 201 of the accumulator 200, The entire bottom surface of the central portion of the diaphragm 230 does not come into contact with the inner surface of the hydraulic chamber 201 of the accumulator 200. That is, only the communication protrusion 232 in the bottom surface of the diaphragm 230, The bottom surface of the chamber 201 is in contact with the bottom surface of the chamber 201 and the bottom surface of the chamber 201 is not in contact with the bottom surface of the accumulator 200 so that a space is formed around the communicating protrusion 232. Since the working fluid on the side of the hydraulic chamber 201 of the accumulator 200 is supplied to the second flow path F2 through the accumulator flow path 231 through the space formed around the communication protrusion 232, The pressure of the side surface of the oil pressure chamber 201 is prevented from rising to prevent the diaphragm 230 from being damaged.

≪ Slot-shaped communicating means for floor avoidance >

16 shows another example of the diaphragm shape according to the third embodiment of the present invention, wherein the communication means is one or more communication slots 233 that do not cross the bottom surface of the diaphragm 230. Fig.

13, even if the bottom surface of the central portion of the diaphragm 230 is in contact with the inner surface of the hydraulic chamber 201 of the accumulator 200, the communication between the accumulator 200 Since the working fluid on the side of the hydraulic chamber 201 of the accumulator 200 is supplied to the second flow path F2 through the accumulator flow path 211 via the communication slot 233, The diaphragm 230 can be prevented from being damaged and the diaphragm 230 can be prevented from being damaged. The diaphragm 230 can be regarded as the same technique as described above with reference to FIG.

≪ Communication flap communication >

17 shows another example of the diaphragm shape according to the fourth embodiment of the present invention. The diaphragm 230 is coupled to the bottom of the central portion of the diaphragm 230 by means of attachment or insertion, 235 (slots or projections) are formed.

The communicating piece 234 is, for example, in the form of a hexahedron having a communicating structure 235 in the form of a slot or a protrusion which is opened at the bottom portion and both sides in the longitudinal direction, and a groove is formed at the bottom of the diaphragm 230, And may be made of different materials such as plastic or metal.

Further, the communicating piece 234 can also protrude downward from the bottom surface of the diaphragm 230.

13, even if the bottom surface of the communication piece 234 inserted into the central portion of the diaphragm 230 is in contact with the inner surface of the hydraulic chamber 101 of the accumulator 100, The operating fluid on the side of the hydraulic chamber 201 of the accumulator 200 is supplied to the second flow path F2 through the accumulator flow path 211 via the communication hole 235 by the communication hole 235 of the piece 234 The pressure rise of the side surface of the hydraulic chamber 201 of the accumulator 200 is prevented to prevent breakage of the diaphragm 230. Although the shape of the diaphragm 230 is different from that of the diaphragm 230, .

<Accumulator-side communication slot-type communication means>

Although the communicating means has been described so far through the structure change of the diaphragm, the communicating means may be formed through the structural modification of the accumulator.

18, the communication means is at least one accumulator-side communication slot 213 connecting the inner surface of the accumulator 200 and the side slope.

The accumulator side communication slot 213 is formed so as to communicate with the accumulator flow path 211 on the bottom surface of the accumulator body 210 and is thus formed over the bottom surface and the side slope of the accumulator body 210.

As the diaphragm 230, a conventional diaphragm without the above-mentioned communication means is used, and of course, the diaphragm 230 having the communication means can be applied together.

The operating speed of the central portion of the diaphragm 230 may become abnormally high as described above and the bottom surface of the central portion of the diaphragm 230 may contact the inner surface of the hydraulic chamber 201 of the accumulator 200. [ The operating oil on the side of the hydraulic chamber 201 is guided to the accumulator fluid passage 211 through the accumulator side communication slot 213 by the accumulator side communication slot 213 connecting the inner surface of the accumulator 200 and the side inclined surface. The pressure of the side surface of the hydraulic chamber 201 is prevented from rising to prevent the diaphragm 230 from being damaged.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

200: accumulator,
210: Accumulator body, 211: Accumulator flow path
212: bolt, 213: accumulator side communication slot
220: Accumulator cover, 230: Diaphragm
231, 233: communication slot, 232:
234: communicating piece, 235: communicating hole

Claims (6)

An accumulator body 210 provided with an accumulator flow path 211 at a bottom portion thereof and formed in the main body of the hydraulic breaker, a groove opened toward the accumulator body, An accumulator cover 220 which is formed in the accumulator body 210 and assembled to the accumulator body 210 and an accumulator cover 220 which is installed in an internal space formed by assembling the accumulator body 210 and the accumulator cover 220, A diaphragm 230 partitioning the valve body 201 into a gas chamber 202 and a gas chamber 202 and a gas filling valve provided in the accumulator cover 220 and a sealing member provided between the accumulator body 210 and the hydraulic breaker body. (240) to buffer the hydraulic pressure,
1. An accumulator of a hydraulic breaker for hitting a chisel by kinetic energy generated by reciprocating movement of a piston in a cylinder and crushing a pit explosion by impact energy converted through a chisel,
The diaphragm of the accumulator is integrally formed with the bottom surface and the side surface of the accumulator body so as to connect the bottom surface of the accumulator body to the bottom surface of the accumulator body, Means,
The communication means is one or more communication slots that open on the bottom surface of the diaphragm toward the bottom surface of the accumulator body and both sides in the longitudinal direction communicate with the hydraulic chamber. The bottom surface of the diaphragm is connected to the bottom of the accumulator body The communication slot is not in contact with the bottom surface of the accumulator body 210 so that the hydraulic fluid on the side of the hydraulic chamber 201 is supplied to the accumulator flow path through the communication slot, And the pressure of the side wall is prevented from rising. delete delete delete An accumulator body 210 provided with an accumulator flow path 211 at a bottom portion thereof and formed in the main body of the hydraulic breaker, a groove opened toward the accumulator body, An accumulator cover 220 which is formed in the accumulator body 210 and assembled to the accumulator body 210 and an accumulator cover 220 which is installed in an internal space formed by assembling the accumulator body 210 and the accumulator cover 220, A diaphragm 230 partitioning the valve body 201 into a gas chamber 202 and a gas chamber 202 and a gas filling valve provided in the accumulator cover 220 and a sealing member provided between the accumulator body 210 and the hydraulic breaker body. (240) to buffer the hydraulic pressure,
1. An accumulator of a hydraulic breaker for hitting a chisel by kinetic energy generated by reciprocating movement of a piston in a cylinder and crushing a pit explosion by impact energy converted through a chisel,
The diaphragm of the accumulator is integrally formed with the bottom surface and the side surface of the accumulator body so as to connect the bottom surface of the accumulator body to the bottom surface of the accumulator body, Means,
The communicating means is a communicating piece (234) formed on the bottom surface of the diaphragm and having at least one communicating structure,
The communicating piece is in the form of a hexahedron having a bottom and a slot-shaped communicating structure 235 open at both sides in the longitudinal direction. The communicating piece is protruded downward from the bottom of the diaphragm, And is supplied to the accumulator flow path through the slot-shaped communication structure to prevent a pressure rise on the side surface of the hydraulic chamber (201). delete

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