KR100654207B1 - Oil pressure circuit system for rock drilling device installed in excavator - Google Patents

Abstract

An oil pressure circuit system of a rock drilling device installed in an excavator is provided to make smooth operation possible and to cut down on manufacturing cost using a reciprocating motor with low capacity by inserting a speed reducer between a shaft of a reciprocating motor and an upper sprocket wheel, and to improve the reliability in operation and to extend the service life of a reciprocating motor by preventing the inflow of impurities and controlling the quantity of oil using discharge pipes. An oil pressure circuit system of a rock drilling device installed in an excavator comprises an oil pump(120) located to one side of an excavator to pump out oil from an oil tank(127), a rotary motor(105) rotated in one direction by pressure of the oil pumped from the oil pump to rotate a drill bit, a primary relief valve(122) setting up the pressure of the oil passed through the rotary motor, a directional control valve(125) selecting the direction of oil using a working lever(124), a reciprocating motor(109) rotated forward or backward by the directional control valve to rotate a chain forward or backward and to ascend or descend a drill unit connected to the chain, a secondary relief valve(126a) used as substitute for the primary relief valve and used to set up the required pressure for the reciprocating motor, a balance valve(130) installed between the reciprocating motor and the directional control valve to keep the oil pressure balance of the reciprocating motor and to ascend or descend a core tube, a oil pressure gauge(123) indicating the oil pressure fixed by the primary relief valve, a primary stop valve(121) rotating the rotary motor selectively by making the pumped oil flow out or not to the rotary motor, a primary discharge pipe(128) connected to the rotary motor to be connected with the oil tank, a secondary stop valve(128a) formed on the primary discharge pipe to discharge the oil selectively if the oil flowing in the rotary motor exceeds the appointed quantity, and a secondary discharge pipe(140) connected between the reciprocating motor and the oil tank to discharge the oil flowing in the reciprocating motor selectively and to protect the reciprocating motor.

Description

Oil pressure circuit system for rock drilling device installed in excavator

1 is a state diagram during general rock drilling work.

Figure 2 is a perspective view of the rock drilling device according to the present invention.

Figure 3a is a rock drilling device according to the present invention, a front view in a pre-operational state without drilling rock.

Figure 3b is a rock drilling device according to the present invention, a front view showing an operating state to puncture the rock.

Figure 4 is a hydraulic circuit diagram of a rock drilling device according to the prior art.

Figure 5a is a detailed exploded perspective view of the elevating deceleration motor connection portion of the rock drilling device according to the present invention.

Figure 5b is a detailed perspective view of the elevating deceleration motor connection portion of the rock drilling device according to the present invention.

6 is a hydraulic circuit diagram of a rock drilling device according to the present invention.

Figure 7 is a hydraulic circuit diagram of a rock drilling device according to another embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

101: support plate 102: core tube

103: guide rod 104: drill bit

105: drilling bit rotation motor 106: upper sprocket wheel

107: lower sprocket wheel 108: chain

109: lifting motor 110: reducer

120: oil pump 121: first stop valve

122: first relief valve 123: hydraulic gauge

124: operation lever 125: elevating direction switching valve

126a: second relief valve 127: oil tank

128: first leakage pipe 128a: second stop valve

130: balance valve 131: third flow pipe (over flow pipe)

132: flow control valve 133: oil cooler

134,135: check valve 136: fourth discharge pipe

137: fifth discharge pipe 138,139: safety limit pressure reducing valve

140: second leakage pipe

The present invention relates to a hydraulic circuit system of a rock drilling device mounted on an excavator, and more particularly, to improve the reliability of the rock drilling work by improving the hydraulic circuit system according to the characteristics of the rock drilling device.

As is well known, the rock mill plant is mounted on the arm tip of the excavator and ascends and rotates by oil supplied from the excavator to drill the rock surface, and the hydraulic circuit system can be made in various ways. Referring to Patent No. 580080, which is a registered right, as an example, a hydraulic circuit system of a rock drilling device is as follows.

1 and 4, the oil pump 120 is located on one side of the excavator to pump oil from the oil tank 127, and rotates in one direction by the hydraulic pressure of the oil pumped from the oil pump 120 And a drilling bit rotation motor 105 for rotating the rock drilling hole 104, a first relief valve 122 for setting oil pressure of the oil passing the drilling bit rotation motor 105, and an operating lever 124. Up and down direction switching valve 125 for selecting the direction of the oil by the operation of the up and down direction change valve 125, the forward or reverse rotation in accordance with the switching of the chain is fixed in the forward direction including the punch bit Alternatively, the elevating motor 109 for elevating and drilling the perforated part connected to the chain by rotating in the reverse direction, and used for setting pressure required for the surrogate and elevating motor 109 in case of failure of the first relief valve 122. Set the hydraulic pressure flowing into the motor 109 The main body is installed between the second relief valve 126a, the elevating motor 109 and the elevating direction switching valve 125 to balance the hydraulic pressure before and after the elevating motor 109, thereby stably elevating the perforated part. The balance valve 130, the hydraulic gauge 123 for indicating the oil pressure of the oil set by the first relief valve 122, and the oil pumped from the oil pump 120 depending on the opening and closing of the drill bit rotation motor ( A first stop valve 121 for selectively rotating the perforated bit rotary motor 105 by flowing to or from the 105 and a first discharge pipe connected to the oil tank 127 to the perforated bit rotary motor 105. 128 and, when the excavator is large, selectively discharge the oil when the flow rate of the oil flowing into the drill bit rotary motor 105 is more than necessary to adjust the flow rate to the first discharge pipe (128) And a second stop valve 128a provided in the The second discharge pipe for protecting the lifting motor 109 by discharging it when the flow rate flowing into the lifting motor 109 is larger than necessary because the excavator is large and connected between the rotor 109 and the oil tank 127 ( 140).

However, in the hydraulic circuit system of the rock drilling apparatus according to Patent No. 580080 as described above, since the upper sprocket wheel is directly connected to the shaft of the elevating motor, a large force is required, and the capacity of the elevating motor has to be increased. Utility Model No. 361015 and Patent No. 602162 configure decelerating transmission of power through a worm gear between a lifting motor and an upper sprocket wheel, but in this case, stone dust or dust at the construction site is connected to the gear connection part. As it is introduced, there is a disadvantage in that the probability of occurrence of abnormal wear increases.

In addition, a large amount of flow is required when rotating the perforated bit rotary motor, but a relatively low flow rate is required when rotating the lifting motor. In the current hydraulic circuit system, the flow rate can be adjusted on the oil pipe connected to the lifting motor side. Since there was no device at all, only the second discharge pipe regulated the flow rate, so its function was limited.

In addition, the hydraulic circuit system of the excavator is provided with one oil cooler, but as shown in the patent application No. 2006-38077, the applicant of the present applicant, all the oil pumped from two oil pumps to supply to the rock drilling device side one oil cooler There was a limit to the ability to cool the oil alone.

On the other hand, in the case of the lifting motor, even after moving to the top dead center or after moving to the bottom dead center, even though the moving motor can not move anymore, oil is continuously introduced to the lifting motor, so that the lifting motor has an excessive load on the lifting motor. Caused to shorten the life of the oil, there was also a problem that the oil discharged to the oil tank backflow through each discharge pipe.

The present invention has been proposed in view of this point, and it is possible to exert a great force while applying a small capacity lifting motor via a speed reducer between the shaft of the lifting motor and the upper sprocket wheel, as well as the shaft, reducer, Prevents foreign substances from entering between the connecting parts of the upper sprocket wheel, and has a separate discharge pipe connected to the oil tank on the oil pipe connected to the lifting motor side, so that the flow rate can be appropriately reduced in pressure, and the rock drilling machine is dedicated. It is to provide a hydraulic circuit system of a rock drilling machine mounted on an excavator that can be installed to further cool the oil to an appropriate temperature by installing an oil cooler.

In another aspect, the perforated part is moved to the top dead center or the bottom dead center, and then all the oil supplied to the lifting motor is discharged to minimize the load on the lifting motor, thereby extending the life of the lifting motor. The check valve is installed on the discharge pipe connected to the motor to prevent backflow.

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

Figure 2 is a perspective view of a rock drilling device according to the present invention, Figure 3a is a rock drilling device according to the present invention, a front view in a state not rock perforated, Figure 3b is a rock drilling device according to the present invention, rock Figure 5a is a detailed exploded perspective view of the elevating deceleration motor connection portion of the rock drilling device according to the present invention, Figure 5b is a detail of the elevating deceleration motor connection portion of the rock drilling device according to the present invention 6 is a hydraulic circuit diagram of a rock drilling device according to the present invention, Figure 7 is a hydraulic circuit diagram of a rock drilling device according to another embodiment of the present invention.

As shown, the rock mill factory to which the present invention is applied, the core tube 102 is installed between the pair of support plates 101 connected to the arm tip of the excavator (P) to enable the lifting and lowering, the core tube ( Guide rod 103 for guiding the lifting and lowering of the 102 is installed in the vertical direction between the support plate 101, the drilling bit 104 in the lower portion of the core tube 102 by the drilling bit rotation motor 105 Rotatably positioned, upper and lower sprocket wheels 106 and 107 are installed on the upper and lower frames 12 and 13 at upper and lower positions of the core tube 102, respectively. A chain 108 having a rear end fixed thereto is rotatably positioned between the upper and lower sprocket wheels 106 and 107, and the upper sprocket wheel 106 and the lifting motor 109 installed on the upper frame 12. Between the axes of the reduction gear 110 is interposed so that the rotational force of the elevating motor 109 is increased and rotated Turning and forward is decelerated.

The hydraulic circuit system for driving the rock mill factory according to the present invention, is located on one side of the excavator (P) oil pump 120 for pumping oil from the oil tank 127, and pumped from the oil pump 120 A perforated bit rotary motor 105 for rotating the rock drill bit 104 while rotating in one direction by the oil pressure of the oil, and a first relief valve 122 for setting the oil pressure of the oil past the perforated bit rotating motor 105. And the elevating direction switching valve 125 which selects the direction of oil by the operation of the operating lever 124, and the chain 108 while being rotated forward or reverse according to the switching of the raising and lowering direction switching valve 125. To lower and lower the perforated part connected to the chain 108 by rotating the motor in the forward or reverse direction, and for the pressure setting required for the substitute motor in case of failure of the first relief valve 122 and the lowering motor 109. Hydraulic pressure flowing into the lifting motor 109 is used as The core tube 102 is provided between the second relief valve 126a and the elevating motor 109 and the elevating direction switching valve 125 to balance the hydraulic pressure before and after the elevating motor 109. The balance valve 130 for raising and lowering stably, the hydraulic gauge 123 indicating the oil pressure of the oil set by the first relief valve 122, and the oil pumped from the oil pump 120 depending on opening and closing A first stop valve 121 for selectively rotating the perforated bit rotating motor 105 by flowing to or from the bit rotating motor 105 and connected to the oil tank 127 to the perforated bit rotating motor 105. The first discharge pipe 128 and the first discharge pipe to selectively discharge the oil to adjust the flow rate when the flow rate of the oil flowing into the drill bit rotary motor 105 is more than necessary if the excavator is large ( Second stop valve 12 provided on 128 8a) is connected between the elevating motor 109 and the oil tank 127 to protect the elevating motor 109 by discharging it when the flow rate flowing into the elevating motor 109 is greater than necessary because the excavator is large. It consists of a second discharge pipe 140 for.

At this time, the balance valve 130 applied to the present invention is applied to any one as long as it can rotate the elevating motor 109 uniformly irrespective of the weight of the drilling portion consisting of the core tube 102 and the drilling bit 104. For example, when the hydraulic pressure is set lower than the hydraulic pressure flowing into the lifting motor 109 is opened by the inflow pressure when the hydraulic pressure flows into the lifting motor 109, the lifting motor 109 to the weight of the perforation part. Regardless of applying a remote control counterbalance valve that can be rotated uniformly, or set lower than the hydraulic pressure flowing into the lifting motor 109, when the hydraulic pressure is discharged from the lifting motor 109, it is opened by the discharge pressure thereof. Elevated motor 109 applies a direct acting counter balance valve that can be rotated uniformly regardless of the weight of the perforated portion, or flow rate and hydraulic pressure flowing into the elevating motor 109 flows naturally, the elevating motor Only the discharge line discharged from the 109 changes the diameter of the pipe to adjust the flow rate of the oil discharged from the lifting motor 109 to adjust the back pressure, so that when the oil is discharged from the lifting motor 109, The falling motor 109 may be applied to a flow rate control valve that can be uniformly rotated irrespective of the weight of the perforation part, and in the drawings, the flow rate control valve as the balance valve 130 is illustrated as an example.

In addition, each adjustment knob or adjustment lever for adjusting the first stop valve 121, the second stop valve 128a, the first relief valve 122, and the second relief valve 126a, respectively, The operating lever 124, the hydraulic gauge 123, and the like for switching 125 are positioned at the rear upper portion of the rock drilling device so that the worker can easily stand and work.

A third discharge pipe for discharging a part of the flow rate of the oil supplied to the lifting motor 109 between the oil pipe 127 and the oil pipe connecting the drilling bit rotary motor 105 and the lifting direction switching valve 125 ( 131 is connected, the third discharge pipe 131 may be properly selected as shown in Figure 6 so that the flow rate can be naturally discharged, as shown in Figure 7 separate flow rate to the third discharge pipe 131 By installing the control valve 132 may be manually adjusted according to the opening and closing.

An oil cooler 133, which is used exclusively for rock drilling, is installed in an oil pipe through which oil is discharged into the oil tank 127, and a check valve for preventing backflow is provided in the first discharge pipe 128 and the second discharge pipe 140. 134 and 135 are respectively installed.

In addition, after moving the drilling portion including the drilling bit 104 to the top dead center or the bottom dead center and the elevating direction switching valve 125 to discharge all the oil supplied to the elevating motor 109 to the oil tank 127 Among the oil pipes connecting the balance valve 130, a fourth discharge pipe 136 is connected between the oil pipe and the oil tank 127 to which the oil is supplied in the direction of forward rotation of the elevating motor 109. The fifth discharge pipe 137 is connected between the oil pipe 127 and the oil tank 127 to which oil is supplied in a direction of rotating the lifting motor 109 in the oil pipe connecting the switching valve 125 and the balance valve 130 to the reverse direction. Safety limit pressure reducing valves 138 and 139 are respectively installed in the fourth discharge pipe 136 and the fifth discharge pipe 137.

The rock bancheon plant according to the present invention configured as described above functions as follows.

First, the operator stands at the rear of the rock drilling device to operate the adjusting knob and the operating lever 124 of each valve while visually looking at the hydraulic gauge 123, and locks the first stop valve 121 before performing the operation. When the oil in the oil tank 127 is pumped by the oil pump 120 in the quasi state, the oil flows into the drill bit rotating motor 105 to drive the drill bit rotating motor 105 so that the drill bit 104 is rotated. Will rotate.

The oil discharged from the drill bit rotating motor 105 flows to the elevating direction switching valve 125 and the elevating motor 109 by the hydraulic pressure set through the first relief valve 122, and the rest of the first relief valve 122 Exhaust through the) is collected back to the oil tank (127).

At this time, the third discharge pipe 131 is connected between the oil pipe and the oil tank 127 connecting between the punching bit rotation motor 105 and the elevating direction switching valve 125 to discharge a part of the oil. As, the oil is discharged to the oil tank 127 through the third discharge pipe 131 before the oil flows into the elevating direction switching valve 125, the elevating motor (via the elevating direction switching valve 125) The amount of oil flowing into the 109 is reduced, so that an amount of oil suitable for driving the lifting motor 109 can flow into the lifting motor 109.

The third discharge pipe 131 may be configured to be naturally discharged to the third discharge pipe 131 in the process of oil flow by selecting the diameter, the flow control valve 132 to the third discharge pipe 131 In the case of configuration, the oil can be selectively discharged through the third discharge pipe 131 according to the user's operation.

When adjusting the first relief valve 122, the operator can turn the adjustment knob slowly while checking the oil pressure with the hydraulic gauge 123, so that the oil pressure can be easily set. Can be.

The oil passing through the hydraulic gauge 123 flows to the elevating direction switching valve 125 side, and when the elevating direction switching valve 125 is positioned in the middle, the oil is directly connected to the oil tank 127. When the oil tank 127 is passed through as it is, the operation lever 124 is operated to move the elevating direction switching valve 125 in the forward direction. The oil moves the elevating motor 109 through the flow path in the forward direction. It will flow in a direction that can be rotated.

At this time, a balance valve 130 is positioned between the elevating motor 109 and the elevating direction switching valve 125 so that the elevating motor 109 is rotated uniformly at all times regardless of the weight of the perforation part. Can be lowered at a uniform speed without falling down when the heavy perforations fall, ensuring safety and simplifying the device.

When the lifting motor 109 is rotated in the forward direction, the drilling part 104 and the core tube 102 are lowered to drill the rock, and when the rock drilling is completed, the drilling bit rotation motor 105 is stopped. In this case, the lifting and lowering motor 109 is rotated in the reverse direction to raise the perforations.

However, the lifting motor 109 is rotated in the forward direction and the perforation part reaches the bottom dead center, or the lifting motor 109 is rotated in the reverse direction so that the perforation part reaches the top dead center, but no longer moves. Oil is continuously introduced to the elevating motor 109 has been described above that the excessive load on the elevating motor 109, in order to solve this problem in the present invention, the elevating direction switching valve 125 and the balance valve 130 ) Connecting the fourth discharge pipe 136 between the oil pipe and the oil tank 127 to which the oil is supplied in the direction of forward rotation of the elevating motor 109 of the oil pipe connecting the, and the elevating direction switching valve (125) The fifth discharge pipe 137 is connected between the oil pipe and the oil tank 127 to which the oil is supplied in the direction in which the lifting motor 109 is reversely rotated among the oil pipes connecting the balance valve 130 to 4 discharge pipes (136) and the fifth The safety limit pressure reducing valves 138 and 139 are respectively installed in the pipe 137. The lifting and lowering motor 109 is rotated in the forward direction and installed in the fourth discharge pipe 136 after the perforation part moves to the bottom dead center. When the safety limit pressure reducing valve 138 is opened and all of the oil supplied to the lifting motor 109 is discharged to the oil tank 127, the rotation of the lifting motor 109 is stopped, and on the contrary, After the motor 109 is rotated in reverse and all of the perforations are moved to the top dead center, the safety limit pressure reducing valve 139 installed in the fifth discharge pipe 137 is opened to supply all the oil supplied to the lifting motor 109 side. Since the rotation of the elevating motor 109 is stopped in the state where it has been discharged to the oil tank 127, unnecessary load is not applied to the elevating motor 109 so that the life of the elevating motor 109 can be extended. .

In addition, the rotational force of the elevating motor 109 is decelerated and transmitted to the upper sprocket wheel 106 by the reducer 110 provided between the elevating motor 109 and the upper sprocket wheel 106 to exert a large force. Therefore, even if the capacity of the elevating motor 109 is somewhat small, it is possible to raise and lower the perforation smoothly, the reducer 110 and the elevating motor 109 and the reducer 110 and the upper sprocket wheel 106, Since the reducer 110 itself is covered by the housing, foreign matter cannot be introduced between the connection parts of each component or each gear connection part of the reducer 110 in the drilling process, thereby ensuring the reliability of its operation.

In addition, the oil flowing into the oil tank 127 via the lifting motor 109 or the oil flowing into the oil tank 127 through the fourth discharge pipe 136 or the fifth discharge pipe 137 is an oil tank ( In the process of passing through the oil cooler 133 installed adjacent to the 127 can be cooled to an appropriate temperature, in particular, oil pumped from two oil pump 120, such as patent application No. 2006-38077 If all of them are supplied to the rock drilling device side, since the oil flow rate is twice as usual, only the oil cooler originally provided has a limitation in its function. Therefore, in the present invention, the oil cooler 133 is exclusively used for the rock drilling device. In addition, even if all the oil is supplied to the rock drilling device side through the two oil pump 120, the oil flowing into the oil tank 127 can be smoothly cooled while passing through the two oil cooler (133). In other words, the hydraulic circuit system can be maintained continuously.

When the rock drilling work is completed and the first stop valve 121 is opened, there is no load on the first stop valve 121 side. Therefore, oil does not flow to the punched bit rotary motor 105 and the first stop valve 121 does not flow. It flows along the flow path on the side to stop the punching bit rotation motor 105 without a separate lifting direction switching valve, and when raising the perforated part, unlike the rock drilling, there is no need to gradually raise the first relief The pressure of the valve 122 is set high so that the oil pressure flows to the lifting motor 109 side, and the operating lever 124 of the lifting direction switching valve 125 is operated to the opposite side so that the oil is the lifting motor 109. By flowing in the reverse direction of the above), the lifting motor 109 is reversely rotated in the opposite direction to that described above, so that the perforated portion can be quickly raised, and the oil discharged from the lifting motor 109 The oil tank 127 is assembled via the elevating direction switching valve 125 to repeat the above operation.

On the other hand, in the case of an excavator of the general size, all the flow rate flowing into the drill bit rotation motor 105 is exhausted, but in the case of a large excavator, the flow rate is also more than necessary, so that the failure of the drill bit rotation motor 105 may occur Opening the second stop valve 128a of the first discharge pipe 128 connected to the drill bit rotating motor 105 to discharge the flow rate more than necessary to minimize the possibility of failure of the drill bit rotating motor 105 smoothly This may be achieved, and the second discharge pipe 140 is also connected between the elevating motor 109 and the oil tank 127 so that the oil is partially discharged from the third discharge pipe 131 and the elevating motor 109. When the amount of the introduced oil is more than necessary when it is introduced to the side is discharged to the oil tank 127, the first discharge pipe 128 and the second discharge pipe 140, check valves 134, 135 are respectively Installed oil Once discharged to the oil tank 127, it is blocked by the check valves 134 and 135 so as to prevent the reverse flow through the first discharge pipe 128 or the second discharge pipe 140 from the oil tank 127, so that the reverse flow is prevented. There is also an advantage that can be prevented.

On the other hand, the hydraulic circuit system according to the present invention is not limited to an excavator as described above is preferably applied to various construction industry equipment or heavy equipment such as rock drilling machine, other construction equipment and the like.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, in the present invention, since the reduction gear is installed between the lifting motor and the upper sprocket wheel, the rotational force and the rotation speed of the lifting motor can be decelerated and transmitted to the upper sprocket wheel by the reducer, and the force thereof can be increased. Therefore, it can reduce the manufacturing cost by using the lifting motor with low oil capacity and reduce the manufacturing cost.The connection part between the reducer and the lifting motor, the reducer and the upper sprocket wheel and the gear connection of the reducer itself by the housing of the reducer The area can be covered to completely eliminate the influence of foreign matter that can occur during rock drilling process, thereby improving the reliability of operation.

In addition, a part of the oil flowing into the lifting motor can be discharged to the oil tank by the third discharge pipe so that the oil does not excessively flow into the lifting motor even when applied to a large excavator, and the perforated part is raised or lowered. At this point, all of the oil supplied to the lifting motor is discharged to the oil tank by the safety limit pressure reducing valve to prevent overloading of the lifting motor, and an additional oil cooler for rock drilling equipment is further provided to the rock drilling device. Even if a large amount is supplied, the oil can be sufficiently cooled.

In addition, since the check valves are respectively installed in the first discharge pipe connected between the drill bit rotating motor and the oil tank and the second discharge pipe connected between the lifting motor and the oil tank, there is no fear of oil flowing back.

Claims (5)

An oil pump 120 positioned at one side of the excavator P to pump oil from the oil tank 127 and a drill bit for rock drilling, while rotating in one direction by hydraulic pressure of oil pumped from the oil pump 120 ( Switching of the drilling bit rotation motor 105 for rotating 104, the elevating direction switching valve 125 for selecting the direction of oil by the operation of the operating lever 124, and the elevating direction switching valve 125 Ascending and descending to rotate the chain 108 connected between the upper sprocket wheel 106 and the lower sprocket wheel 107 in the forward or reverse direction to raise or lower the perforations connected to the chain 108 It is installed between the motor 109 and the elevating motor 109 and the elevating direction switching valve 125 to balance the hydraulic pressure before and after the elevating motor 109 to raise and lower the perforated part stably. Balance valve 130 and the The first discharge pipe 128 is connected to the drill bit rotating motor 105 to communicate with the oil tank 127, and is connected between the lifting motor 109 and the oil tank 127 so that the excavator is large and the lift In the hydraulic circuit system of the rock drilling device mounted on an excavator including a second discharge pipe 140 for protecting the lifting motor 109 by discharging it when the flow rate flowing into the falling motor 109 is more than necessary. , Between the shaft of the elevating motor 109 and the upper sprocket wheel 106 via the speed reducer 110, the rotational force of the elevating motor 109 is increased and the rotational speed is reduced so that the upper sprocket wheel 106 To forward); Partial discharge of the flow rate of the oil supplied to the lifting motor 109 side between the oil pipe and the oil tank 127 connecting between the drilling bit rotation motor 105 and the lifting direction switching valve 125 Hydraulic circuit system of the rock drilling device mounted to the excavator, characterized in that by connecting the third discharge pipe (131). The method of claim 1, The third discharge pipe 131 is a hydraulic circuit system of the rock drilling device mounted to the excavator, characterized in that the flow control valve 132 is installed. The method of claim 1, An oil circuit for discharging oil into the oil tank 127 is provided with an oil cooler 133, the hydraulic circuit system of the rock drilling device mounted on the excavator. The method of claim 1, After moving the drilling part including the drilling bit 104 to the top dead center or the bottom dead center, the lifting direction switching valve 125 to discharge all the oil supplied to the lifting motor 109 to the oil tank 127. The fourth discharge pipe 136 is connected between the oil pipe and the oil tank 127 to which oil is supplied in a direction in which the elevating motor 109 is rotated forward among the oil pipes connecting the balance valve 130. And between the oil tank 127 and the oil pipe supplied with oil in a direction in which the lifting motor 109 is reversely rotated among the oil pipes connecting the lifting direction switching valve 125 and the balance valve 130. A fifth discharge pipe 137 is connected to the rock discharge hole mounted on the excavator, characterized in that the safety limit pressure reducing valves 138 and 139 are respectively installed in the fourth discharge pipe 136 and the fifth discharge pipe 137. Hydraulic circuit system of the device. The method of claim 1, The first discharge pipe (128) and the second discharge pipe 140, the hydraulic circuit system of the rock drilling device mounted to the excavator, characterized in that the check valve 134, 135 for preventing backflow is installed, respectively.

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