JPH09217582A - Drilling control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drive impact mechanism, rotating mechanism and feed mechanism by one hydraulic pump and perform automatic control according to a drilling state by diverting and uniting oil pressure through a flow regulating valve, a pressure regulating valve, and the like in a drilling machine for drilling a rock-bed. SOLUTION: Part of oil pressure fed from a hydraulic pump is diverted to pass via rotating mechanism 2 and feed mechanism 3, and then the whole oil pressure joins and flows back to a tank 10 via impact mechanism 1. The oil quantity and oil pressure fed to the respective mechanisms 1, 2, 3 are controlled by a flow regulating valve, an oil pressure regulating valve, and the like provided in each oil passage. Feed thrust and feed speed can be increased by providing a booster valve and a feed speed switching valve. The respective mechanisms 1, 2, 3 can thereby be actuated only by the hydraulic pump 7 of displacement necessary for the actuation of the impact mechanism, and in case drilling resistance is increased by the change of a drilling state, the operating oil pressure and oil quantity of the respective mechanisms 1, 2, 3 are automatically controlled to lower impact force and feed thrust so as to be able to continue drilling work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling control device for a drilling machine used for rock excavation and the like.

[0002]

2. Description of the Related Art Generally, a drilling machine used for rock excavation is equipped with a hydraulically driven striking mechanism, a rotating mechanism, and a feeding mechanism. The striking mechanism strikes a drilling rod to rotate it. The mechanism applies rotation to the drilling rod, and the feed mechanism applies thrust to the drilling rod to drill the rock.

At this time, in the striking mechanism, the flow rate Q_D・ Pressure P
_D, The flow rate Q in the rotating mechanism_R・ Pressure P _R, With the feeding mechanism
Quantity Q_F・ Pressure P_FPressure oil is consumed. Impact mechanism is flow rate
Has the property of increasing the pressure. The rotation mechanism
The pressure changes depending on the condition of the rock to be drilled. The feeding mechanism is
Drill while adjusting the thrust according to the condition of the rock to be drilled.
You.

Conventionally, the striking mechanism, the rotating mechanism, and the feeding mechanism have been driven by independent hydraulic circuits, as shown in FIG. In this punching machine, the impact hydraulic pump 74, the rotary hydraulic pump 75, and the feed hydraulic pump 7 are used.
6 is driven by an electric motor 77, and supplies necessary pressure oil to the striking mechanism 71, the rotating mechanism 72, and the feeding mechanism 73, respectively.

The pressure oil discharged from the impact hydraulic pump 74 is sent to the impact mechanism 71 via the impact valve block 78. A striking relief valve 79 is provided in the striking valve block 78. A main perforation selection valve 80 and a counterbore perforation selection valve 81 are provided in the drain line of the perforation relief valve 79, and a seat for controlling counterbore perforation percussion pressure is provided downstream of the counterbore perforation selection valve 81. A relief valve 82 for boring is provided.

The pressure oil discharged from the rotary hydraulic pump 75 is sent to the rotary mechanism 72 via the rotary valve block 83. In the rotation valve block 83, a rotation relief valve 84, a rotation state switching valve 85, and a rotation direction switching valve 86 are provided from the upstream side. Rotation state switching valve 85
A flow rate adjusting valve 88 for controlling the rotation speeds at the time of punching and pulling out is provided in the passage communicating with the tank 87 from the tank.

The pressure oil discharged from the feed hydraulic pump 76 is sent to the feed mechanism 73 via the boom control valve 89 and the feed valve block 90. Since the boom operation and the boring are not performed at the same time, the pressure oil discharged from the feed hydraulic pump 76 is supplied to the full-volume feed mechanism 73 during the boring operation. In the feed valve block 90, a feed relief valve 91, a feed state switching valve 92, and a feed direction switching valve 93 are provided from the upstream side. A thrust adjusting relief valve 94 for controlling the thrust at the time of punching and pulling out is provided in the passage communicating from the feed state switching valve 92 to the tank 87.

Further, a pressure switch 95 is provided in the normal rotation side passage of the rotating mechanism 72 to detect an abnormal increase in the rotating pressure which occurs when the rotating resistance increases due to the change of the rock mass during drilling, It is possible to control to stop the impact and stop the feeding or reverse the feeding direction.

[0009]

However, in this drilling machine, since only the impact is stopped and the feed is stopped or the feed direction is switched by the increase of the rotation pressure, it is possible to cope with the change of the rotation resistance. The thrust and striking force cannot be changed appropriately. Further, the impact hydraulic pump 74, the rotary hydraulic pump 75, and the feed hydraulic pump 7
6, a striking mechanism 71, a rotating mechanism 72, and a feeding mechanism 7 are provided.
Oil amount required for each operation of the 3 Q _D, Q _R, Q
A constant displacement hydraulic pump having a capacity capable of supplying _F is used. Therefore, when the punching machine is operating, the impact hydraulic pump 74, the rotary hydraulic pump 75, and the feed hydraulic pump 76 always operate individually, the impact mechanism 71, the rotation mechanism 72, and the feed mechanism 73. Continue to discharge a fixed amount of pressure oil required for each. That is, when drilling work, a total of Q _D + Q _R + Q _F is required.

When the punching machine is operating, the pressure oil supplied to each of the striking mechanism 71, the rotating mechanism 72, and the feeding mechanism 73 is a relief valve 79 for striking, respectively.
When the set pressure of the rotation relief valve 84 or the feed relief valve 91 is exceeded, the pressure is switched to the return side. Therefore, pressure oil is applied between the striking mechanism 71, the rotation mechanism 72, and the feed mechanism 73 according to the punching state. Is not properly distributed,
Greater energy loss.

The present invention solves the above-mentioned problems in the control of a punching machine, in which all of the striking mechanism, the rotating mechanism, and the feeding mechanism are operated only by supplying the amount of oil required for the operation of the striking mechanism. It is an object of the present invention to provide a perforation control device capable of automatically controlling the operating hydraulic pressures of the striking mechanism, the rotating mechanism, and the feeding mechanism according to the change in the perforation state.

[0012]

In the perforation control device of the present invention, in a perforation machine having a hydraulically driven percussion mechanism, a rotation mechanism, and a feed mechanism, the percussion high-pressure passage of the percussion mechanism serves as a flow rate assurance valve. The high pressure input passage is connected to the high pressure input passage through the striking working passage, the low pressure passage is connected to the return passage, and the normal rotation side passage and the reverse rotation side passage of the rotating mechanism are connected from the residual amount discharge portion of the flow rate assurance valve. It is connected to the rotary working passage that is branched and provided with a rotary flow control valve and the rotary return passage that is branched from the striking high pressure passage, and the forward flow passage and the backward drive passage of the feed mechanism are connected to the rotary flow passage of the rotary working passage. Connected to the feed working passage branched from the output side of the adjusting valve and provided with a pressure reducing valve, and the feed return passage branched from the downstream side of the branch point of the feed working passage of the rotation working passage, Send to the output side of the pressure reducing valve or the return passage for sending The amount adjustment valve is provided, which solves the above problems by providing a main relief valve between the passage and return the pressure input passage.

During drilling work, pressure oil is supplied from the hydraulic pump to the high pressure input passage. A predetermined amount of the supplied pressure oil is supplied to the striking high pressure passage of the striking mechanism by the flow rate guarantee valve, and the remaining pressure oil is supplied from the residual amount discharge portion of the flow rate guarantee valve to the rotation operation passage. A part of the pressure oil supplied to the rotation operation passage is supplied to the feed mechanism via the feed operation passage, and the return oil from the feed mechanism merges with the pressure oil in the rotation operation passage via the return return passage. .

The combined pressure oil in the rotary working passage is supplied to the rotary mechanism, and the return oil from the rotary mechanism merges into the high-pressure hammer passage through the rotary return passage. The combined pressure oil is supplied to the striking mechanism, and the return oil from the striking mechanism returns to the tank through the low-pressure striking passage and the returning passage. The amount of pressure oil supplied to the feed mechanism at this time is regulated by the feed flow rate adjusting valve, and the amount of pressure oil supplied to the rotating mechanism is regulated by the rotary flow rate adjusting valve. Excess pressure oil supplied to the high pressure input passage is discharged from the main relief valve to the tank.

In this way, the return oil from the feed mechanism and the rotating mechanism is combined with the high-pressure passage for striking and supplied to the striking mechanism. Therefore, the high-pressure input passage must be supplied with the amount of oil necessary for the operation of the striking mechanism. For example, the striking mechanism, the rotating mechanism, and the feeding mechanism can all be operated. Therefore, it suffices to use only one hydraulic pump having a capacity equivalent to that of a conventional percussion hydraulic pump.

When the condition of the bedrock deteriorates during the boring operation, the rotational resistance increases and the rotational pressure of the rotating mechanism rises, the hydraulic pressure in the rotary working passage increases. Then, the hydraulic pressure in the return passage for feeding also rises, but the hydraulic pressure in the working passage for feeding does not rise because it is regulated by the pressure reducing valve, so the thrust becomes weaker and the rotational resistance of the rotating mechanism is automatically reduced by reducing the rotational resistance automatically. Let

Further, the oil pressure in the working passage for rotation rises,
When the set pressure of the main relief valve is exceeded, part of the pressure oil supplied to the high pressure input passage is discharged from the main relief valve to the tank, reducing the amount of oil supplied to the striking mechanism and reducing the striking force. , Automatically reduce the rotation resistance and reduce the rotation pressure of the rotation mechanism. As described above, the perforation control device of the present invention can automatically control the operating hydraulic pressure and the oil amount of the striking mechanism, the rotating mechanism, and the feeding mechanism according to the change in the perforation state.

When performing work such as connecting, recovering, and cleaning holes for punching rods, the striking mechanism is stopped and only the feeding mechanism or the feeding mechanism and rotating mechanism is operated. By providing a booster valve between the branch point of the feed working passage and the branch point of the feed return passage of the rotation working passage, a booster valve is provided between the feed working passage and the return passage as necessary. The differential pressure can be increased and the thrust can be increased.

Further, by providing a feed speed switching valve that bypasses the feed flow rate adjusting valve on the input side of the feed flow rate adjusting valve, the feed rate can be increased as necessary when operating only the feed mechanism. .

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a hydraulic circuit diagram of a perforation control apparatus showing an embodiment of the present invention. The punching machine includes a hydraulically driven striking mechanism 1, a rotating mechanism 2, and a feeding mechanism 3. The striking mechanism 1 strikes a rod for punching, and the rotating mechanism 2 rotates the rod for punching. At the same time as feeding, the feed mechanism 3 gives thrust to the drilling rod to drill the rock.

The striking high-pressure passage 4 of the striking mechanism 1 is connected to a high-pressure input passage 6 via a flow rate guarantee valve 5, and the high-pressure input passage 6 is connected to a hydraulic pump 7 so that the pressure from the hydraulic pump 7 is reduced. Oil is supplied. The striking low-pressure passage 8 of the striking mechanism 1 is connected to the return passage 9, and the return oil from the striking mechanism 1 returns to the tank 10 through the striking low-pressure passage 8 and the return passage 9.

The normal rotation side passage 11 of the rotating mechanism 2 is connected to a rotation operation passage 12 branched from the residual amount discharge portion of the flow rate assurance valve 5, and the rotation flow passage adjusting valve 13 is provided in this rotation operation passage 12. Is provided. Reverse passage 1 of rotating mechanism 2
4 is connected to a rotation return passage 15 branched from the striking operation passage 40. Forward passage 16 of the feed mechanism 3
Is connected to a feed working passage 17 branched from the output side of the rotation flow rate adjusting valve 13 of the rotation working passage 12, and a pressure reducing valve 18 is provided in the feed working passage 17. The retreating side passage 19 of the feeding mechanism 3 is provided with the rotation working passage 1
The feed return passage 20 is branched from the downstream side of the branch point of the second feed operation passage 17, and the feed return passage 20 is provided with a feed flow rate adjusting valve 21.

A main relief valve 22 is provided between the high pressure input passage 6 and the return passage 9. During the drilling operation, when the hydraulic pump 7 is driven, the pressure oil is supplied to the high pressure input passage 6. A predetermined amount of the supplied pressure oil is supplied to the striking operation passage 40 of the striking mechanism 1 by the flow rate guarantee valve 5, and the remaining pressure oil is supplied from the remaining amount discharge portion of the flow rate guarantee valve 5 to the rotation operation passage 12. Supplied.

A part of the pressure oil supplied to the rotary operation passage 12 is supplied to the feed mechanism 3 via the feed operation passage 17, and the return oil from the feed mechanism 3 is rotated via the feed return passage 20. It joins the pressure oil in the working passage 12. At this time, the amount of pressure oil supplied to the feed mechanism 3 is regulated by the feed flow rate adjusting valve 21, and the pressure is regulated by the pressure reducing valve 18. Since a hydraulic cylinder is used for the feed mechanism 3 and the pressure receiving area of the forward side oil chamber 3A is made larger than the pressure receiving area of the backward side oil chamber 3B, the pressure of the forward side oil chamber 3A is lower than that of the backward side oil chamber 3B. However, it is possible to advance the feed in the range where the thrust is generated due to the difference in the pressure receiving area. The flow rate adjusting valve 21 may be provided on the output side of the pressure reducing valve 18 in the feed working passage 17.

The pressure oil in the rotary operation passage 12 that has joined with the return oil from the feed mechanism 3 is supplied to the rotary mechanism 2 to operate the rotary mechanism 2. The amount of pressure oil supplied to the rotating mechanism 2 is regulated by the rotational flow rate adjusting valve 13. Return oil from the rotating mechanism 2 joins the striking operation passage 40 through the rotation return passage 15. The combined pressure oil is supplied to the striking mechanism 1 through the high-pressure striking passage 4, and the striking mechanism 1 is operated. The return oil from the striking mechanism 1 is a low-pressure passage 8 for striking, a return passage 9
Return to tank 10 via.

Excess pressure oil supplied to the high pressure input passage 6 is discharged from the main relief valve 22 to the tank 10. In this way, the return oil from the feed mechanism 3 and the rotation mechanism 2 joins the high-pressure impact passage 4 and is supplied to the impact mechanism 1. Therefore, when drilling work is performed, the high-pressure input passage 6 receives oil quantity Q _H. = Q _D + ΔQ _R + ΔQ _F should be supplied.

Here, ΔQ _R is the drain oil amount of the rotating mechanism, and ΔQ _F is the difference between the inflow amount of oil into the forward side oil chamber 3A and the outflow amount from the backward side oil chamber 3B of the feed mechanism 3. And both are very small. Therefore, if Q _H ≈Q _D, that is, the high-pressure input passage 6 is supplied with an amount of oil approximately required for the operation of the striking mechanism 1, all of the striking mechanism 1, the rotating mechanism 2, and the feed mechanism 3 can be activated. it can.
Therefore, it is sufficient to use only one hydraulic pump having a capacity equivalent to that of a conventional hydraulic pump for striking.

When the condition of the bedrock deteriorates during the boring operation, the rotational resistance increases and the rotational pressure of the rotating mechanism 2 increases, the hydraulic pressure in the rotary working passage 12 increases. Then, the oil pressure in the feed return passage 20 also rises, but the oil pressure in the feed operation passage 17 is regulated by the pressure reducing valve 18 and does not rise, so the thrust becomes weak. When the rotation resistance further increases and the pressure in the forward rotation side passage 11 of the rotation mechanism 2 increases, the thrust of the feed mechanism 3 becomes zero.
Then, the forward movement is stopped, and if the pressure in the forward rotation side passage 11 of the rotation mechanism 2 rises above this, the feed mechanism 3 starts the backward movement. If the thrust becomes weak, the rotation resistance automatically decreases, and the rotation pressure of the rotation mechanism 2 decreases.

Further, when the oil pressure in the rotary operation passage 12 rises and exceeds the set pressure of the main relief valve 22, a part of the pressure oil supplied to the high pressure input passage 6 is discharged from the main relief valve 22 to the tank. As a result, the amount of oil supplied to the striking mechanism 1 is reduced and the striking force is reduced, so that the rotation resistance is automatically reduced and the rotation pressure of the rotation mechanism 2 is reduced. In this way, the perforation control device can automatically control the operating hydraulic pressure and the oil amount of the striking mechanism 1, the rotating mechanism 2, and the feed mechanism 3 according to the change in the perforation state.

FIG. 2 is a hydraulic circuit diagram of a perforation control device showing another embodiment of the present invention. The basic configuration of the punching machine is the same as that shown in FIG. 1, and includes a hydraulically driven striking mechanism 1, a rotating mechanism 2, and a feeding mechanism 3. The high-pressure striking passage 4 of the striking mechanism 1 is connected to the high-pressure input passage 6 via the flow rate assurance valve 5 and the striking operation passage 40, and the high-pressure input passage 6 is connected to the hydraulic pump 7.
Pressure oil is supplied from the hydraulic pump 7. The striking low-pressure passage 8 of the striking mechanism 1 is connected to the return passage 9, and the return oil from the striking mechanism 1 returns to the tank 10 via the striking low-pressure passage 3 and the return passage 9.

The normal rotation side passage 11 and the reverse rotation side passage 14 of the rotating mechanism 2 are provided with a flow rate assurance valve 5 via a rotation direction switching valve 30.
Is connected to the rotation working passage 12 branched from the remaining amount discharge portion and the rotation return passage 15 branched from the striking high pressure passage 4. The forward passage 16 and the backward passage 1 of the feeding mechanism 3
9 is a feed operation passage 17 branched from the output side of the rotation flow rate adjusting valve 13 of the rotation operation passage 12 and a branch of the feed operation passage 17 of the rotation operation passage 12 via the feed direction switching valve 31. Return passage 20 for branching from the downstream side of the point
It is connected to the. A feed flow rate adjusting valve 21 is provided in the feed return passage 20, and a feed speed switching valve 33 for communicating the feed return passage 20 with the return passage 9 is provided on the input side of the feed flow rate adjusting valve 21. It is provided.

A pressure reducing valve 18 is provided in the feed operation passage 17. A non-perforated feed relief valve 35 and a normally closed non-perforated relief switching valve 36 are provided between the vent port of the pressure reducing valve 18 and the return passage 9. A variable pressure relief valve 37 is provided. The set pressure of the perforated feed relief valve 34 is higher than the set pressure of the non-perforated feed relief valve 35, and the variable pressure relief valve 37 optionally sets the set pressure from the set pressure of the perforated feed relief valve 34 to a lower pressure. Can be changed to

Feeding working passage 17 of the rotating working passage 12
And the branch point of the return passage 20 for feeding,
A boost valve 32 is provided. A main relief valve 22 is provided between the high pressure input passage 6 and the return passage 9. Vent port of main relief valve 22 and return passage 9
A counterbore relief valve 29 and a normally closed counterbore selection valve 28 are provided between and, and a normally open work selection valve 24 is provided in parallel therewith. Further, the impact relief valve 23 is provided between the impact actuation passage 40 and the return passage 9. A counterbore relief valve 27 and a normally closed counterbore selection valve 26 are provided between the vent port of the percussion relief valve 23 and the return passage 9, and a normally open percussion selection valve 25 is provided in parallel therewith. Is provided.

When the hydraulic pump 7 is driven during the punching work, the pressure oil is supplied to the high pressure input passage 6. At this time, the normally open work selection valve 24 and the impact selection valve 25 are switched to the closed side, the rotation direction switching valve 30 is set to the forward rotation side, the feed direction switching valve 31 is set to the forward side, and the feed speed switching valve 33 is set. Switch to the feed flow rate adjusting valve 21 side.

Then, a predetermined amount of the supplied pressure oil is supplied to the striking operation passage 4 of the striking mechanism 1 by the flow rate guarantee valve 5.
0, and the remaining pressure oil is supplied from the remaining amount discharge part of the flow rate guarantee valve 5 to the rotation working passage 12. A part of the pressure oil supplied to the rotation working passage 12 is supplied to the feed mechanism 3 via the feed working passage 17, and the return oil from the feed mechanism 3 passes through the feed return passage 20 to the rotation working passage 12. Join the pressure oil of.

At this time, the amount of pressure oil supplied to the feed mechanism 3 is regulated by the feed flow rate adjusting valve 18, and the pressure is regulated by the pressure reducing valve 18. Normally, the output side pressure of the pressure reducing valve 18 is
It is determined by the set pressure of the perforation feed relief valve 34. When adjusting the thrust force depending on the drilling state, the set pressure of the variable pressure relief valve 37 may be changed. Since a hydraulic cylinder is used for the feed mechanism 3 and the pressure receiving area of the forward side oil chamber 3A is made larger than the pressure receiving area of the backward side oil chamber 3B, the pressure of the forward side oil chamber 3A is lower than that of the backward side oil chamber 3B. However, it is possible to advance the feed in the range where the thrust is generated due to the difference in the pressure receiving area. Therefore, it is not necessary to switch the pressure increasing valve 32 during perforation.

The pressure oil in the rotary working passage 12 that has joined the return oil from the feed mechanism 3 is supplied to the rotary mechanism 2, and the rotary mechanism 2 is operated. The amount of pressure oil supplied to the rotating mechanism 2 is regulated by the rotational flow rate adjusting valve 13. Return oil from the rotating mechanism 2 joins the striking operation passage 40 through the rotation return passage 15. The combined pressure oil is supplied to the striking mechanism 1 through the striking high-pressure passage 4 to operate the striking mechanism 1. The return oil from the striking mechanism 1 is a low-pressure passage 8 for striking, a return passage 9
Return to tank 10 via.

Excess pressure oil supplied to the high pressure input passage 6 is discharged from the main relief valve 22 to the tank 10. When performing counterbore drilling, counterbore selection valves 26, 2
Switch 8 to the open side. Then, the relief valve 2 for counterbore
Since the set pressures of 7 and 29 are low, the operating pressures of the impact relief valve 23 and the main relief valve 22 are reduced, and the pressure of the impact operating passage 40, the pressure of the rotary operating passage 12,
Also, the pressure in the feed operation passage 17 decreases. Therefore, the striking force of the striking mechanism 1, the rotating force of the rotating mechanism 2, and the thrust of the feeding mechanism 3 are weakened, so that appropriate counterbore work can be performed.

As described above, if the amount of oil required to operate the striking mechanism 1 is supplied to the high pressure input passage 6, all of the striking mechanism 1, the rotating mechanism 2 and the feeding mechanism 3 can be operated. When the condition of the rock becomes worse during the boring operation, the rotational resistance increases and the rotational pressure of the rotating mechanism 2 increases, the hydraulic pressure in the rotary working passage 12 increases. Then, the oil pressure in the feed return passage 20 also rises, but the oil pressure in the feed operation passage 17 is regulated by the pressure reducing valve 18 and does not rise, so the thrust becomes weak. When the rotation resistance further increases and the pressure in the forward rotation side passage 11 of the rotation mechanism 2 increases, the thrust of the feed mechanism 3 becomes zero.
Then, the forward movement is stopped, and if the pressure in the forward rotation side passage 11 of the rotation mechanism 2 rises above this, the feed mechanism 3 starts the backward movement.

When the thrust becomes weak, the rotation resistance automatically decreases, and the rotation pressure of the rotation mechanism 2 decreases. When the hydraulic pressure in the rotary operation passage 12 rises and exceeds the set pressure of the main relief valve 22, a part of the pressure oil supplied to the high pressure input passage 6 is discharged from the main relief valve 22 to the tank. The amount of oil supplied to the mechanism 1 is reduced and the striking force is reduced, so that the rotation resistance is automatically reduced and the rotation pressure of the rotation mechanism 2 is reduced. In this way, the punching control device is configured such that the striking mechanism 1, the rotating mechanism 2,
Also, the operating oil pressure and the oil amount of the feed mechanism 3 can be automatically controlled.

The punching machine may perform work without hitting, such as connecting rods, collecting rods, and cleaning holes. During such non-perforating work, the percussion selection valve 25 is opened and the percussion mechanism 1 is deactivated. And the working passage 12 for rotation
The pressure increasing valve 32 is switched to the pressure increasing side, and the non-piercing relief switching valve 36 is switched to the opening side. Then, a pressure difference is generated between the branch point of the feed operation passage 17 and the branch point of the feed return passage 20 of the rotation operation passage 12, so that the thrust can be increased. The output side pressure of the pressure reducing valve 18 at this time is determined by the set pressure of the non-piercing feed relief valve 35.

By operating the rotation direction switching valve 30 and the feed direction switching valve 31 in this state, the rotation mechanism 2 is normally or reversely rotated, and the feed mechanism 3 is moved forward or backward,
Work such as connecting rods, collecting rods, and cleaning holes can be efficiently performed. When only the feed mechanism is operated, the feed speed switching valve 33 is switched to the return passage 9 side. Then, the return oil from the feed mechanism 3 flows out to the return passage 9 without the flow rate being regulated by the feed flow rate adjusting valve 21, so that the feed speed can be increased. When the feed flow rate adjusting valve 21 is provided on the output side of the pressure reducing valve 18 of the feed working passage 17, a feed speed switching valve that bypasses the feed flow rate adjusting valve 21 is provided, and if necessary, from the pressure reducing valve 18. The pressure oil is directly flown to the feed direction switching valve 31 without passing through the feed flow rate adjusting valve 21.

[0043]

As described above, the punching control device for a punching machine according to the present invention operates all the striking mechanism, the rotating mechanism, and the feeding mechanism only by supplying the amount of oil necessary for operating the striking mechanism. In addition, it is possible to automatically control the operating oil pressure and the oil amount of the striking mechanism, the rotating mechanism, and the feeding mechanism according to the change in the drilling state.

Further, by providing a booster valve between the branch point of the feed working passage and the branch point of the feed return passage of the rotation working passage, the feed working passage and the feed return passage are provided as necessary. It is possible to increase the pressure difference between the two and increase the thrust. Furthermore, by providing a feed speed switching valve that bypasses the feed flow rate adjusting valve on the input side of the feed flow rate adjusting valve, the feed rate can be increased as necessary when operating only the feed mechanism.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of a punching machine showing an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of a punching machine showing another embodiment of the present invention.

FIG. 3 is a hydraulic circuit diagram of a conventional drilling machine.

[Explanation of symbols]

 1 Impact Mechanism 2 Rotation Mechanism 3 Feed Mechanism 4 Impact High Pressure Passage 5 Flow Assurance Valve 6 High Pressure Input Passage 7 Hydraulic Pump 8 Impact Low Pressure Passage 9 Return Passage 10 Tank 11 Forward Rotation Passage 12 Rotation Working Passage 13 Rotation Flow Control Valve 14 Reverse rotation side passage 15 Rotation return passage 16 Forward side passage 17 Feeding working passage 18 Pressure reducing valve 19 Retracting side passage 20 Feeding return passage 21 Feed flow adjusting valve 22 Main relief valve 23 Strike relief valve 24 Work selection valve 25 Stroke Selection valve 30 Rotation direction switching valve 31 Feeding direction switching valve 32 Booster valve 33 Feed speed switching valve 40 Operating passage for impact

Claims (3)

[Claims] A striking mechanism driven by hydraulic pressure, a rotating mechanism,
And a perforation machine having a feed mechanism, the high-pressure passage for impact of the impact mechanism is connected to the high-pressure input passage through the flow rate assurance valve and the operation passage for impact, the low-pressure passage for impact is connected to the return passage, and the rotation mechanism The normal rotation side passage and the reverse rotation side passage are connected to a rotation working passage branched from the remaining amount discharge part of the flow rate guarantee valve and provided with a rotation flow rate adjusting valve and a rotation return passage branched from the striking working passage. Then, the forward passage and the backward passage of the feed mechanism are branched from the output side of the rotation flow rate adjusting valve of the rotation working passage and the feed working passage of the rotation working passage and the feed working passage of the rotation working passage are provided. Connected to the feed return passage branched from the downstream side of the branch point, a feed flow rate adjusting valve is provided on the output side of the pressure reducing valve of the feed operation passage or the feed return passage, and between the high pressure input passage and the return passage. Characterized by having a main relief valve Hole control device. 2. The perforation control apparatus according to claim 1, wherein a booster valve is provided between a branch point of the feed working passage and a branch point of the feed return passage of the rotary working passage. 3. The perforation control apparatus according to claim 2, wherein a feed speed switching valve that bypasses the feed flow rate adjusting valve is provided on the input side of the feed flow rate adjusting valve.