WO2014208922A1

WO2014208922A1 - Hydraulic rotating striking device

Info

Publication number: WO2014208922A1
Application number: PCT/KR2014/005334
Authority: WO
Inventors: 김진국
Original assignee: 주식회사 에버다임
Priority date: 2013-06-24
Filing date: 2014-06-18
Publication date: 2014-12-31

Abstract

The present invention relates to a hydraulic rotating striking device having a shock buffering device, which is configured to buffer a shock, formed to be able to reciprocate inside a body portion of the striking device. The hydraulic rotating striking device comprises, between the body portion and the outer peripheral surface of the shock device, a high-pressure chamber, a first low-pressure chamber, a second low-pressure chamber, a first pressure chamber, and a second pressure chamber, respectively. The shock buffering device is characterized by comprising: an annular collar portion formed at the center of an outer diameter portion; an upper diameter portion formed on the upper side of the collar portion, the upper end surface of the upper diameter portion facing the inner upper end of the body portion; a lower diameter portion formed on the lower side of the collar portion, the lower end surface of the lower diameter portion facing a striking surface of a shank; and a second bypass channel for establishing communication between the high-pressure chamber and the second pressure chamber, when the distance of movement is below a preset distance during a boring operation, and interrupting the communication between the high-pressure chamber and the second pressure chamber, when the distance of movement is equal to or above the preset distance.

Description

Hydraulic Rotary Blower

The present invention relates to a hydraulic rotary striking device, and more particularly to a hydraulic rotary striking device having an impact buffer device for improving the drilling performance and increase the durability of the striking device.

At various quarries, tunnels, and ground refining sites, blasting works are performed to crush crushed materials such as rocks and soil for the purpose of collecting aggregates and removing rocks.In this case, blasting powder is charged for blasting work. Hydraulic drilling machines (rock drills) are used to drill holes for charging powders in the crushed material such as rocks and ground.

In general, a hydraulic rotary striking device (drifter) 30 such as the example shown in FIG. 1 on the mast of the hydraulic boring machine for drilling the charge charging hole into the to-be-shipped material enables the reciprocating conveyance on the guide. Is mounted.

As shown in FIG. 2, the hydraulic perforator transfers the rod 34 on the mast through a transfer means such as a cylinder or a hydraulic feed motor during the perforation of the crushed material 90. After contacting the drill bit (70) fastened to the workpiece 90 to the object to be crushed 90, the impact piston 32 for performing a reciprocating motion by hydraulic pressure in the hydraulic rotary striking device 30 is the shank (34) By transmitting the driving force and the rotational driving force transmitted from the hydraulic motor 80 to the drill bit 70 in contact with the object 90 through the shank 34 and the rod 60, the hydraulic pressure The rotational driving force of the motor 80 and the striking force of the striking piston 32 are applied to the crushed object 90 to perform the function of crushing the crushed object 90.

1 and 2, the hydraulic structure of the hydraulic rotary striking device 30 will be described in detail. When the hydraulic oil discharged from the first hydraulic pump 10 is supplied to the hydraulic rotary striking device 30, the hydraulic type is applied. To the plurality of

flow paths

42, 44, 46, 48, 50, 52, 54 and the first and

second control valves

12, 14 formed in the inner body portion 40 of the rotary striking device 30. The reciprocating motion of the striking piston 32 is performed, and at this time, the kinetic energy generated when the striking piston 32 descends is converted into impact energy by the striking piston 32 striking the shank 34.

The impact energy generated when the striking piston 32 strikes the shank 34 is transmitted to the drill bit 70 installed at the end portion through one or more rods 60 engaged with the shank 34. The impact energy transmitted to the drill bit 70 is transmitted to the crushed object 90 in contact with the crushed object 90.

In addition, when the hydraulic oil is discharged from the second hydraulic pump 20, it is supplied to the hydraulic motor 80 through the third control valve 22 through the flow path, the second hydraulic pump 20 in the hydraulic motor (80). The rotational driving force is generated by the high-pressure hydraulic fluid discharged from the hydraulic drive, and the rotational driving force generated by the hydraulic motor 80 drives the pinion gear 82 to rotate.

At this time, the pinion gear 82 is engaged with the drive gear 36 so that the rotational driving force generated from the hydraulic motor 80 is transmitted to the drive gear 36.

The rotational driving force transmitted to the drive gear 36 rotates the shank 34 coupled to the drive gear 36 through a fastening means such as a spline 56 and the like, and is transmitted to the shank 34. The rotational driving force is transmitted to one or more rods 60 connected to the shank 34, and the rotational driving force transmitted to the rods 60 rotates the drill bit 70 coupled to the end of the rod 60. The rotational driving force transmitted to the drill bit 70 is transmitted to the crushed object 90 so that the crushed object 90 is crushed.

As a result, the striking force generated when the striking piston 32 strikes the shank 34 and the rotational driving force generated from the hydraulic motor 80 are transmitted to the crushed object 90 through the drill bit 70 to be crushed. This is done.

As shown in FIG. 2, the structure of the conventional hydraulic rotary striking device driven by the above operation is engaged with the pinion gear 82 so that the rotational driving force of the hydraulic motor 80 can be transmitted to the shank 34. The lower side portion of the thrust plate 38 is in contact with the upper side of the drive gear 36 to be connected, and the upper side portion of the thrust plate 38 is the body portion 40 of the striking device 30. It is formed to contact with.

Therefore, when the drive gear 36 is rotated to transmit the rotational driving force of the hydraulic motor 80 to the shank 34, the contact surface of the drive gear 36 and the thrust plate 38, and the strike Mechanical friction wear occurs at the contact surface between the body portion 40 of the device 30 and the thrust plate 38, and the drill bit 70 assembled at the end of the rod 60 is crushed. The greater the pressing force to be pressed), the faster the wear due to the increase in frictional heat due to the mechanical friction of the thrust plate 38.

In addition, the striking force generated when the striking piston 32 strikes the shank 34 is not completely used for the crushing of the crushed object 90, and a part of the crushing force is reflected from the crushed object 90 so that the drill bit 70 and It is transmitted to the striking device 30 via the rod 60 and the shank 34. At this time, the contact surface of the drive gear 36 and the thrust plate 38 by the impact reaction reflected from the crushed object 90, and the body portion 40 of the thrust plate 38 and the striking device 30. ) An impact occurs at the contact surface.

The impact reaction force is increased as the strength of the crushed object 90 increases, and thus the contact surface of the drive gear 36 and the thrust plate 38 and the contact surface of the thrust plate 38 and the body part 40. The transmitted reaction force is also increased.

As described above, the impact reaction force acts in a direction U opposite to the drilling direction D, that is, in a direction of separating the contact between the crushed object 90 and the drill bit 70, and thus, the drill bit ( The contact force applied to contact 70 is lowered, and in some cases, the contact between the drill bit 70 and the crushed object 90 is released when the impact reaction force is greater than the force for pressing the drill bit 70. Will be generated until.

When the contact between the drill bit 70 and the to-be-damaged object 90 is released due to the impact reaction force, the thrust plate 38 and the striking device 30 as well as the contact between the drive gear 36 and the thrust plate 38 are removed. The contact of the body portion 40 is also released. At this time, when the striking piston 32 descends and strikes the shank 34, the striking force generated at the time of striking is not normally transmitted to the to-be-damaged object 90, so that punching performance is achieved. Not only is it lowered, but the drill bit 70 hits the object 90 and then rebounds and bounces in the opposite direction U due to the strike reaction, thereby driving the drive gear 36 assembled with the shank 34. The upper surface of the thrust plate 38 hits the lower side of the thrust plate 38 and at the same time the upper side of the thrust plate 38 hits the body portion 40 of the striking device 30, the drive gear 36, Severe damage to the strut plate 38 and the striking device 30 It can result.

In addition, the type and strength of the crushed object 90 is changed depending on the depth of drilling during the drilling operation, when the hardness of the crushed object 90 suddenly lowers due to the sudden appearance of soft ground, such as a cylinder or a hydraulic feed motor of a hydraulic punching machine. As a result, the drilling speed of the drill bit 70 with respect to the to-be-damaged object 90 is increased instantaneously rather than the feeding speed D of the striking device 30.

In this case, the contact between the drill bit 70 and the object 90 is released because the contact between the drill bit 70 and the object 90 is not formed, resulting in a thrust of the drive gear 36 and the thrust. The contact surface of the plate 38 and the contact between the thrust plate 38 and the body portion 40 of the striking device 30 are released.

At this moment, when the piston 32 strikes the shank 34, the drill bit 70 springs up by the strike reaction after hitting the workpiece 90, thereby driving drive 36 assembled with the shank 34. The upper surface of the thrust plate 38 strikes the lower surface of the thrust plate 38, and the upper surface of the thrust plate 38 strikes the body portion 40 of the striking device 30, thereby driving the drive gear 36, Serious damage to thrust plate 38 and striking device 30 can result.

As described above, in the conventional hydraulic rotary striking device, wear occurs due to mechanical friction and frictional heat generated on the contact surface of the thrust plate and the drive gear and the contact surface of the thrust plate and the body of the striking device when the shank rotates. The impact of each part due to the impact reaction reflected from the object to be impacted when the object to be crushed, due to the degradation of puncture performance generated when the drill bit and the object to be contacted is released, and the impact transmission between parts inside the impact device, etc. There is a problem of deterioration in durability.

In addition, when the parts of the thrust plate and the drive gear are damaged due to the accumulation of impacts due to wear at the time of the rotation and impact reaction at the time of impact, the debris separated by the damage causes serious damage to the inside of the impact device. You may.

The object of the present invention is to prevent the damage of the striking device due to friction during rotational drive by preventing contact of the internal parts of the striking device and the body part during the drilling operation, and at the same time hydraulically buffers the impact reaction from the crushed object back to the striking device Accordingly, an object of the present invention is to provide a hydraulic rotary striking device having an impact buffer device that can prevent mechanical shock from being transmitted to a body part of the striking device.

In addition, the drill bit of the drill bit to the object to be crushed is faster than the conveying speed of the striking device by a conveying means such as a cylinder or a hydraulic feed motor to prevent the contact of the drill bit and the object to be released momentarily to prevent the drill bit and the object to be released An object of the present invention is to provide a hydraulic rotary striking device having a function of maintaining contact at all times.

At the same time, if the shock absorber moves more than a predetermined distance in the drilling direction in order to maintain the contact of the drill bit and the to-be-damaged object, damage of the hydraulic rotary striking device is prevented by preventing collision between the shock absorber and the inner body of the striking device. An object of the present invention is to provide a hydraulic rotary blower with a function to prevent the damage.

In the hydraulic rotary striking device according to the present invention for achieving the above object, in the hydraulic rotary striking device configured to enable the reciprocating movement of the striking piston by a hydraulic circuit having a plurality of flow paths and control valves, the interior of the striking device An impact buffer device is installed so as to be able to slide on the coaxial line with the striking piston.

A through hole is formed in the center of the shock absorber to accommodate the striking piston, and an annular collar portion protruding outward is provided in the center of the outer diameter portion. In addition, the upper portion is provided with an upper and lower portion facing the inner upper end of the body portion on the basis of the collar portion, the lower portion facing the striking surface of the shank is provided on the lower side of the collar portion, the hydraulic fluid flows into one side of the upper and lower portions It characterized in that the bypass passage is provided or discharged. The bypass passage may include at least one second bypass passage formed on one side of the upper diameter portion, and at least one first bypass passage formed on one side of the lower diameter portion.

In addition, a high pressure chamber is provided in the body portion of the striking device to operate the shock absorber, a second low pressure chamber is provided above the high pressure chamber, and a first low pressure chamber is provided below the high pressure chamber. It is characterized by. Here, the high pressure chamber is in communication with the second high pressure flow path receiving the high pressure hydraulic fluid discharged from the first hydraulic pump to form a high pressure, the second low pressure chamber is in communication with the third low pressure flow path to form a low pressure, The first low pressure chamber communicates with the first low pressure flow path to form a low pressure.

The second bypass flow passage may be configured to selectively communicate or block communication between the high pressure chamber and the second pressure chamber applying hydraulic pressure to the rear surface of the impact buffer device according to the position of the shock absorber.

The first bypass passage may be configured to selectively communicate or block communication between the first low pressure chamber and the first pressure chamber applying hydraulic pressure to the front surface of the impact buffer device according to the position of the shock absorber.

In addition, the second low pressure flow path is formed to selectively communicate with or block communication with the low pressure flow path and the second pressure chamber for applying hydraulic pressure to the upper surface of the impact buffer device according to the position of the shock absorber.

According to the present invention, the hydraulic rotary striking device is provided with an impact buffer device, thereby preventing mechanical contact of the internal parts of the striking device and the body part when transferring the rotational force generated from the hydraulic motor during the drilling operation to the drill bit, the impact device body It is possible to increase the durability by preventing damage to the parts.

In addition, by absorbing the impact reaction generated during the drilling work in the form of instantaneous pressure rise and pressure drop by the hydraulic buffer action to prevent mechanical shock transfer to the impact device body portion, to prevent damage to the impact device body parts durability Can be increased.

In addition, it is possible to reduce the maintenance cost for the striking device due to the damage prevention and durability of the body and the internal parts of the striking device.

In addition, productivity can be increased by improving the drilling performance by maintaining the drill bit and the crushed object at all times in various situations caused by the type and strength change of the crushed object depending on the piercing depth.

1 is a view showing an external appearance of a hydraulic rotary striking device.

2 shows a schematic internal structure of a conventional hydraulic rotary striking device.

3 is an enlarged cross-sectional view showing in detail the structure of the rotating part of the hydraulic rotary striking device shown in FIG.

4 is a view showing a detailed structure of the shock absorber according to an embodiment of the present invention.

FIG. 5 is a view illustrating a state in which the drilling oil is not discharged from the first hydraulic pump in a state in which contact support force between the drill bit and the crushed object is formed during operation of the shock absorber according to an embodiment of the present invention, and thus no drilling operation is performed drawing.

FIG. 6 is a view illustrating a state in which a normal drilling operation is performed by discharging hydraulic fluid from a first hydraulic pump in a state in which contact support force between a drill bit and a crushed object is formed during operation of an impact buffer device according to an embodiment of the present invention. .

7 is a view showing a schematic internal structure of a hydraulic rotary striking device having a shock absorber according to an embodiment of the present invention.

8 is a view showing a state during the soft section puncture operation of the shock absorber according to an embodiment of the present invention.

9 is a view showing a state at the time of drilling a cavity section of the impact buffer device according to an embodiment of the present invention.

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

Figure 4 is a view showing a detailed structure of the shock absorber according to an embodiment of the present invention, Figure 5 is a contact support force between the drill bit and the workpiece during operation of the shock absorber according to an embodiment of the present invention is formed FIG. 6 is a view illustrating a state in which a drilling operation is not performed because no hydraulic fluid is discharged from a first hydraulic pump in a state, and FIG. 6 is a contact between a drill bit and a to-be-damaged object during operation of an impact buffer device according to an embodiment of the present invention. It is a figure which shows the state in which hydraulic oil is discharged from a 1st hydraulic pump in the state in which the support force was formed. Here, the hydraulic rotary striking device 300 is a blow force generated when the striking piston 310 is formed to reciprocate in the body 400 hit the shank 320 and the rotational driving force transmitted from the hydraulic motor 230. By transferring the shank 320 and the rod 600 to the drill bit 700 in contact with the crushed object 800, the crushed object 800 is crushed.

As shown in FIGS. 4 to 6, the hydraulic rotary striking device 300 accommodates the shock absorbing device 500 that performs hydraulic shock absorbing action inside the body 400 so as to reciprocate, and the first hydraulic pressure. As the high pressure hydraulic oil discharged from the pump 100 is supplied through the hydraulic circuits, the impact piston 310 reciprocates in the shock absorber 500, and the shank 320 is driven to rotate. At this time, between the body 400 and the outer circumferential surface of the shock absorber 500 is supplied with a high-pressure hydraulic fluid discharged from the first hydraulic pump 100 through a high-pressure flow path, the high-pressure chamber 430 is formed therein, The second low pressure chamber 440 is in communication with the third low pressure flow path 150 and the low pressure is formed therein, and the second pressure chamber 460 to which the high pressure hydraulic fluid is supplied or blocked according to the position of the shock absorber 500. And, the first pressure chamber 450 is compressed or expanded according to the position of the shock absorber 500, and the first low pressure chamber 420 in communication with the first low pressure passage 146, the low pressure is formed therein, respectively It is provided.

The shock absorber 500 has a cylindrical shape in which a through hole 510 is formed at a central portion thereof so as to be able to slide in the same axial direction as the striking piston 310 in a space located by a predetermined distance in the drilling direction D with respect to the striking piston 310. It is made of and disposed in the body portion 400. Here, the shock absorbing device 500 is formed of an annular collar portion 520 protruding outward from the center of the outer diameter portion, the upper portion 512 is formed on the upper side of the collar portion 520, the body portion 400 The upper diameter portion 530 facing the inner upper end of the) and the lower diameter portion 540 formed at the lower side of the collar portion 520 and facing the striking surface of the shank 320. Here, the second bypass passage 532 may be formed at one side of the upper diameter portion 530, and the first bypass passage 544 may be formed at one side of the lower diameter portion 540.

Then, the first pressure chamber 450 for supplying the hydraulic pressure to the lower surface 524 of the collar portion 520, the second pressure chamber 460 for multiplying the hydraulic pressure to the upper surface 522 of the collar portion 520 and A first low pressure chamber 420 communicating with the first low pressure passage 146 and having a low pressure therein may be further provided, and a high pressure chamber 430 communicating with the second high pressure passage 144 and having a high pressure. Here, the first pressure chamber 450 may communicate with or block communication with the first low pressure chamber 420 through the first bypass passage 544, and the second pressure chamber 460 may have a second bypass passage. The communication with the high pressure chamber 430 or the communication may be blocked through 532.

On the other hand, the high pressure hydraulic fluid discharged from the first hydraulic pump 100 is supplied to the high pressure chamber 430 through the second high pressure passage 144, and the high pressure supplied to the high pressure chamber 430 is supplied to the shock absorber 500. The operating oil of the is supplied to the second pressure chamber 460 formed on the upper surface 522 side of the collar portion 520 through the second bypass flow path 532 to form a high pressure.

As such, when a high pressure is formed in the second pressure chamber 460, a pressing force in the drilling direction D is formed on the upper surface 522 side of the collar part 520. As shown in FIG. 5, the first hydraulic pressure is formed. In the situation where the hydraulic fluid is not discharged from the pump 100, the magnitude of the contact reaction force transmitted from the crushed object 900 is greater than the pressing force applied to the upper surface 522 of the collar part 520. Thus, the upper surface 522 side of the collar portion 520 is raised to the top dead center position in contact with the body portion 400 of the striking device 300.

At this time, at the top dead center position of the shock absorber 500, the upper surface 512 formed at the end of the upper diameter portion 530 is not in contact with the inner surface 410 of the body portion 400 of the striking device 300.

However, as shown in FIG. 6, when the high pressure hydraulic oil is discharged from the first hydraulic pump 100 and the high pressure hydraulic oil is supplied to the striking device 300 through the first high pressure passage 142, the blow piston 310. At the same time as the rising stroke starts, the high pressure hydraulic fluid is supplied to the high pressure chamber 430 through the second high pressure passage 144 branched from the first high pressure passage 142. Then, the high-pressure hydraulic oil supplied to the high pressure chamber 430 as shown in FIG. 6 is supplied to the second pressure chamber 460 through the second bypass flow path 532 to apply pressure to the upper surface 522 of the collar part 520. By forming the shock absorbing device 500 is moved in the drilling direction (D).

At this time, when the shock absorber 500 moves in the drilling direction D more than the set distance by the high pressure formed in the second pressure chamber 460, the second pressure chamber 460 through the second bypass flow passage 532. Communication between the high pressure chamber 430 is blocked and the working oil flowing into the second pressure chamber 460 is blocked.

In addition, when the shock absorber 500 moves in the drilling direction D, the first pressure chamber 450 formed on the lower surface 524 of the collar portion 520 of the shock absorber 500 may have a first bypass flow path. The low pressure is formed by communicating with the first low pressure chamber 420 where the low pressure is formed through the 544. At this time, leakage occurs from the second pressure chamber 460 to the first pressure chamber 450 through the outer circumferential surface of the collar part 520, so that the pressure of the second pressure chamber 460 is lowered.

As such, the second pressure chamber 460 and the high pressure chamber 430 communicate with each other or block the communication through the second bypass flow passage 532, so that the upper surface 522 of the collar part 520 of the shock absorbing device 500. The pressure of the second pressure chamber 460 acting on the side is appropriately adjusted. Therefore, the contact support reaction force generated when the drill bit 700 and the to-be-damaged object 800 are contacted by the punching direction D of the striking device 300 and the upper surface of the collar part 520 of the impact buffer device 500 ( The shock absorber 500 is positioned at the point where the punching direction D acting on the side of the pressure 522 is balanced.

As described above, by adjusting the hydraulic pressure applied to the first and

second pressure chambers

450 and 460 through the first bypass passage 544 and the second bypass passage 532, the contact supporting reaction force and the shock absorber (500) The position where the punching direction D acting on the upper surface 522 side of the collar portion 520 is in equilibrium becomes the position of the shock absorber 500 in the normal drilling operation.

Then, in the state in which the hydraulic oil is not discharged from the first hydraulic pump 100, the striking device 300 is transferred in the drilling direction (D) in the drilling direction (D) between the drill bit 700 and the crushed object (800). In addition to forming a contact bearing force of the drill bit, when the high pressure hydraulic fluid is discharged from the first hydraulic pump 100 to move the shock absorber 500 in the drilling direction D, the drill bit 700 and the workpiece 800 The contact support force of the liver is increased to make a more firm contact between the drill bit 700 and the workpiece 800.

Figure 7 shows a schematic internal structure of the hydraulic rotary striking device with a shock absorber according to an embodiment of the present invention, wherein the position of the shock absorber 500 is normally operating oil as shown in FIG. Is the position of the shock absorber 500 in the drilling operation is supplied.

As shown in the figure, when the high pressure hydraulic fluid discharged from the first hydraulic pump 100 is supplied to the striking device 300 via the first high pressure flow path 142, a plurality of flow paths formed inside the striking device 300 The stroke piston 310 is reciprocated by the 130, 134, 136, 138, 140, 142 and the first and

second control valves

110 and 120, and the movement generated when the strike piston 310 moves downward. The energy is converted into impact energy when the striking piston 310 strikes the shank 320 and is transferred to the crushed object 800 through the shank 320, the rod 600, and the drill bit 700, thereby giving the crushed object 800. ) Is crushed.

In addition, the high pressure hydraulic fluid discharged from the second hydraulic pump 200 is supplied to the hydraulic motor 230 through the third control valve 210 and the flow path 220 to rotate the drive shaft of the hydraulic motor 230 to rotate the driving force. Generates.

At this time, the rotational driving force generated in the hydraulic motor 230 is transmitted to the shank 320 through the pinion gear 232, the drive gear 330, the rotational driving force transmitted to the shank 320 at least one rod 600 By passing through the drill bit 700 and the crushed object 800 is to crush the crushed object (800).

That is, the striking piston 310 in a state in which the striking device 300 is transferred in the drilling direction D by a transfer means such as a feed motor installed on the mast of the perforator so as to contact the drill bit 700 and the workpiece 800. ) Strikes the shank 320 to generate impact energy, and the impact energy generated at this time and the rotational driving force generated by the rotation of the hydraulic motor 230 are avoided through at least one rod 600 and the drill bit 700. The perforation work is made by transferring the crushed material 800.

In the above drilling operation, all the impact energy generated when the shank 320 of the striking piston 310 is hit is not used to crush the crushed object 800, and some of the impact energy is lost from the crushed object 800. Reflected and transmitted to the striking device 300 through the drill bit 700, the rod 600 and the shank 320.

In this case, since the high pressure is formed in the second pressure chamber 460 of the shock absorber 500 by being communicated with the high pressure chamber 430 through the second bypass flow path 532, the impact reflected from the to-be-damaged object 800 is affected. When the reaction force is transmitted to the shock absorber 500 through the shank 320, the shock absorber 500 is moved in the opposite direction (U) by a fine distance. Accordingly, the second pressure chamber 460 is compressed to increase the internal pressure, and due to the increase in the internal pressure of the second pressure chamber 460, the upper surface 522 of the collar part 520 of the shock absorber 500 is increased. The pressing force in the puncturing direction D acting on is increased so that the shock absorber 500 is moved in the puncturing direction D again by a minute distance to return to the position before the impact reaction is transmitted.

That is, the impact reaction force transmitted back from the crushed object 800 is increased in pressure and pressure of the second pressure chamber 460 acting on the upper surface 522 of the collar portion 520 of the shock absorber 500 as described above. It is absorbed by hydraulic dampening of the descent.

In addition, since the time required for the impact shock absorbing device 500 to move slightly in the opposite direction of the drilling U and return again is very short, before the impact piston 310 hits the shank 320 again, the shock absorbing device ( The return of 500 is made, at which time the rise and fall of the pressure in the second pressure chamber 460 is observed at an instantaneous peak pressure.

Due to the hydraulic shock absorbing action, mechanical contact and impact transmission between the internal parts of the striking device 300 and the inner surface 410 of the body part 400 are not generated, thereby improving durability of the main body of the striking device 300. At the same time, the bottom surface 542 of the impact

shock absorbing device

500, 540 and the contact of the shank 320 is also always maintained, thereby preventing damage to the internal parts of the striking device 300 due to the shock transmission when the contact is released.

Also, due to the hydraulic shock absorbing action of the shock absorber 500, the contact between the shock absorber 500, the shank 320, the rod 600, and the drill bit 700 and the workpiece 800 is always maintained. The impact energy generated when the shank 320 of the striking piston 310 strikes can be smoothly transmitted to the crushed object 800, so that the punching performance of the striking device 300 is improved, thereby increasing the productivity of the perforator.

In addition, the rotational force generated by the rotation of the hydraulic motor 230 during the drilling operation is passed through the pinion gear 232, the drive gear 330, the shank 320, the rod 600 and the drill bit 700 ( The direct contact between the internal parts of the striking device 300 and the body part 400 is not generated in the process of being transmitted to 800, thereby improving durability of the striking device 300.

8 is a view showing a state during the soft section puncture operation of the shock absorber according to an embodiment of the present invention, the drill bit 700 than the feed rate of the striking device 300 during operation of the shock absorber 500 A diagram showing the state of the shock absorber 500 during the drilling operation of the soft section moving in the drilling direction (D) at a rapid speed by increasing the drilling speed penetrating through the crushed object (800).

As shown in the figure, when the type and the strength of the crushed object 800 is changed according to the depth of drilling during the drilling operation, the impact device 300 when a soft piercing section that suddenly lowers the strength of the crushed object 800 appears The drilling speed of the drill bit 700 to drill the crushed object 800 is increased more than the feed rate of the instantaneously.

In this case, since the contact bearing force formed between the drill bit 700 and the to-be-damaged object is lowered by a conveying means such as a cylinder or a hydraulic feed motor installed on the mast of the perforator, the collar part of the shock absorber 500 The shock absorbing device 500 is rapidly moved forward in the drilling direction D by the pressure of the second pressure chamber 460 applied to the upper surface 522.

Accordingly, the contact between the upper end of the shank 320 and the lower surface 542 of the shock absorber 500 is maintained, and at the same time, the contact between the drill bit 700 and the workpiece 800 is continuously maintained. The impact energy of the striking device 300 is smoothly transmitted to the crushed object 800. Accordingly, it is possible to prevent collision between the internal parts of the striking device 300 and the body part 400 of the striking device 300 due to instantaneous contact release.

In addition, the impact energy generated when hitting the shank 320 of the striking piston 310 is transmitted to the crushed object 800 smoothly to ensure a stable puncturing performance, thereby improving productivity.

As described above, in a situation where the drilling speed of the drill bit 700 is instantaneously faster than the conveying speed of the striking device 300, the second pressure toward the upper surface 522 of the collar part 520 of the shock absorbing device 500. The high pressure of the chamber 460 acts so that the shock absorber 500 moves quickly in the drilling direction D. In this case, when the shock absorber 500 moves in the drilling direction D more than the set distance, the second pressure chamber 460 is blocked from communicating with the high pressure chamber 430 through the second bypass flow path 532. 2 the pressure applied to the pressure shock absorber 500 is reduced by maintaining the pressure applied to the pressure chamber 460.

FIG. 9 is a view illustrating a state in the cavity section drilling operation of the shock absorber according to an embodiment of the present invention, and more specifically, transfer of the striking device 300 during operation of the shock absorber 500. FIG. 8 is a view illustrating an impact buffer device 500 during a drilling operation in a cavity section in which a drilling speed of the drill bit 700 penetrating the crushed object 800 is increased more than the speed of the soft section work shown in FIG. 8. . This is mainly generated during the drilling operation of the hollow point where the crushed material 800 which is occasionally generated during the drilling operation does not exist.

Cara 520 of the shock absorber 500, because the contact support force is not formed between the drill bit 700 and the object to be crushed at the cavity point where the object to be crushed (800) does not exist as described above The shock absorber 500 may be moved to a position where the lower surface 524 of the collar portion 520 collides with the body portion 400 of the striking device 300 by the pressing force applied to the upper surface 522.

If the collar portion 520 of the shock absorber 500 is strongly collided with the body portion 400 of the striking device 300, the collar portion 520 may be damaged since the body portion 400 may be damaged. When the lower surface 524 does not collide with the body portion 400 or when collision cannot be avoided, the impact force applied to the colliding portion should be minimized as much as possible.

Therefore, when the shock absorber 500 moves in the drilling direction D more than the set distance, the second pressure chamber 460 is supplied with the hydraulic oil supplied from the high pressure chamber 430 through the second bypass flow path 532. The internal pressure of the second pressure chamber 460 is lowered by being blocked. As such, as the internal pressure of the second pressure chamber 460 is lowered, the pressing force in the drilling direction D applied to the upper surface 522 of the collar portion 520 is reduced, so that the lower portion 524 of the collar portion 520 is reduced. The impact force applied to the impact portion when the body portion 400 of the striking device 300 collides is reduced.

In addition, when the shock absorber 500 is further lowered in the drilling direction D more than the set distance, the first pressure chamber 450 formed on the lower surface 524 side of the collar portion 520 is the first bypass flow path ( Communication with the first low pressure chamber 420 is blocked by 544, so that the first pressure chamber 450 is closed.

At this time, when the shock absorber 500 is further lowered in the drilling direction D in a situation where the first pressure chamber 450 is sealed, the internal pressure of the first pressure chamber 450 is rapidly increased, 1 Due to the rapid increase in the internal pressure of the pressure chamber 450, the falling speed of the shock absorber 500 is sharply reduced.

In addition, since the second pressure chamber 460 formed on the upper surface 522 side of the collar part 520 communicates with the first low pressure passage 146 through the second low pressure passage 148, the second pressure chamber 460 is not included in the second pressure chamber 460. Low pressure is formed. Accordingly, the pressing force in the drilling direction D applied to the upper surface 522 side of the collar portion 520 is further reduced.

The collision between the lower portion 524 of the collar portion 520 of the impact buffer device 500 and the body portion 400 of the impact device 300 due to the lowering speed and the pressing force of the punching direction D of the impact buffer device 500 is reduced. It is possible to prevent, and even if a collision occurs, it is possible to minimize the amount of impact generated in the collision part, so that no damage can be caused.

As described above, when the impact buffer device 500 is crushed at the cavity point descends in the drilling direction D at a very high speed, in the high pressure chamber 430 through the second bypass flow path 532. The inflow of the hydraulic oil supplied to the second pressure chamber 460 is blocked so that the pressure of the second pressure chamber 460 is lowered, and in some cases, a low pressure is formed in the second pressure chamber 460 so that the collar portion is formed. 520, the pressing force in the drilling direction D applied to the upper surface 522 can be reduced. In addition, when the first bypass passage 544 is blocked to seal the first pressure chamber 450 formed on the lower surface 524 of the collar part 520, the internal pressure is increased, so that the punching direction D of the impact buffer device 500 is increased. It is possible to reduce the moving speed to). Accordingly, the collision between the shock absorber 500 and the striking device 300 body 400 is prevented, and even if a collision occurs, the impact buffer 500 and the body of the striking device 300 are minimized by minimizing the amount of impact. Damage to the 400 can be prevented.

As described above, the structure and operation of the hydraulic rotary striking device having the shock absorber have been described with reference to the embodiment shown in the drawings. However, this is merely illustrative, and if the hydraulic circuits of the shock absorber are the same, It is to be regarded as equivalent to the present invention, and one of ordinary skill in the art will understand that other embodiments may be modified and equivalent from the present invention.

Therefore, the true technical protection scope should be defined by the technical spirit of the appended claims.

Claims

A shock absorber that hydraulically buffers the body is accommodated in a reciprocating manner, and the blow piston reciprocates in the shock absorber as the high pressure hydraulic fluid discharged from the first hydraulic pump is supplied through the hydraulic circuits. In the hydraulic rotary striking device which drives the shank while rotating,

Between the body portion and the outer circumferential surface of the shock absorber is supplied with a high-pressure hydraulic fluid discharged from the first hydraulic pump through a high pressure flow path and a high pressure chamber formed therein, and a third low pressure flow path communicates with the low pressure inside A second low pressure chamber formed therein, a second pressure chamber through which high-pressure hydraulic fluid is supplied or blocked according to the position of the shock absorber, a first pressure chamber compressed or expanded according to the position of the shock absorber, and a first The first low pressure chamber which is in communication with the low pressure flow path and the low pressure is formed therein, respectively,

The shock absorbing device is disposed in the body portion having a cylindrical shape having a through hole formed in a central portion thereof so as to be able to slide in the same axial direction as the striking piston in a space located at a predetermined distance with respect to the striking piston.

An annular collar portion formed in the center of the outer diameter portion and protruding outwardly;

An upper diameter portion formed on an upper side of the collar portion and having an upper end surface facing an inner upper end of the body portion;

A lower diameter portion formed at a lower side of the collar portion and having a lower end facing the striking surface of the shank; And

Is formed on one side of the upper diameter portion, when moving to less than the set distance during the drilling operation, the high pressure chamber and the second pressure chamber is in communication, when moving to more than the set distance at least one or more agents for blocking the communication between the high pressure chamber and the second pressure chamber 2. A hydraulic rotary striking device comprising a bypass channel.
According to claim 1, wherein the shock absorber,

And at least one first bypass passage for communicating the first pressure chamber with the first low pressure chamber.
The method of claim 2, wherein the first bypass flow path,

When the shock absorber moves below the set distance, the first pressure chamber and the first low pressure chamber communicate with each other to discharge hydraulic oil from the first pressure chamber to the first low pressure chamber, thereby lowering the pressure inside the first pressure chamber. To reduce the pressure applied to the lower side of the collar,

When the shock absorber moves in the puncturing direction over the set distance, it blocks the discharge of hydraulic oil from the first pressure chamber to the first low pressure chamber to increase the pressure in the first pressure chamber, thereby increasing the speed in the puncturing direction of the shock absorber. Hydraulic rotary blow device, characterized in that for reducing.
The method of claim 1, wherein the second pressure chamber,

When the shock absorber moves in the drilling direction over a set distance, the second low pressure passage connected to the first low pressure passage communicates with the hydraulic rotary blow device, characterized in that the low pressure is formed.