JP3447108B2 - Drilling machine rotation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the turning of a rod of a drilling machine.
The present invention relates to a device for controlling rolling. [0002] 2. Description of the Related Art The rock mass to be drilled by a drilling machine is homogeneous.
Not the properties of the rock mass, such as hardness, viscosity, and the presence or absence of cracks
Since the rotation resistance of the rod during drilling differs due to differences,
To efficiently drill blast holes with good rise
Is the rotation speed along with the rock pressure and feed force.
The degree must be changed according to the condition of the bedrock.
Generally, when the rock is hard and the drilling speed is low,
If the wear is fast, the speed should be low, and the rock mass is soft
If the speed is high, control is performed so that the speed is high. [0003] In particular, a relatively stable bedrock has a large resistance.
Excessive torque is generated when the vehicle enters the rock
The screws connecting the rods are abnormally tight
Removing the rod after drilling may hinder the work.
Therefore, in such a case, a more appropriate rotation speed
Control is needed. Conventionally, the rod rotation mechanism of a drill
The hydraulic source that drives the hydraulic motor includes a fixed displacement hydraulic pump.
Pumps are used, and the rotation of the drill
A flow control valve is provided in the middle of the motor drive line to control the flow rate
Or a directional control valve provided in the middle of the hydraulic motor drive line
By controlling the flow rate by adjusting the opening of the
I was However, when a flow control valve is used,
Flow control with pressure and temperature compensation for fine flow control
Valves are necessary and expensive, and the durability of the adjustment handle
There is a title. In addition, when adjusting the opening degree of the passage of the directional control valve,
In this case, it is difficult to add pressure / temperature compensation.
Make several types of notches on the bus spool and transfer the spool in stages.
A valve was manufactured to move and increase or decrease the flow rate
However, it took time to conduct flow confirmation experiments during development, and during mass production
The plating residue of the lube spool adheres to the notch edge,
It is said that the performance will change because the passage area will be disordered when updating the tool
There was a defect. On the other hand, the hydraulic motor of the rotating mechanism is driven.
If a variable displacement hydraulic pump is used for the
Equivalent horsepower with low-pressure large flow and high-pressure small flow due to the robot mechanism
Force control is possible. However, when controlling the flow rate, the pressure
Low pressure and low speed rotation depending on the drilling target.
It is difficult to properly control the rotation speed when it is desirable
New [0006] SUMMARY OF THE INVENTION The present invention relates to a drilling machine.
To solve this problem in rotation control,
Difficulty such as adjusting the opening of the flow control valve or directional control valve passage
Reliable fine-grained rotation control without using any flow control means
Can be performed, and the rod rotation mechanism of the drilling machine and the rod
Improves durability and reduces excessive rotational torque.
To prevent abnormal tightening of the rod screw
Drilling machine rotation control device to enable thread cutting
The purpose is to provide. [0007] SUMMARY OF THE INVENTION The present invention provides a rod rotating machine.
Variable displacement hydraulic pump
Hydraulic rock drill with hydraulic pump
To the mechanism, Maximum flow restricting piston and hydraulic motor
Switch the control valve for rotation interposed in the main line to the forward rotation side.
From the transfer-side pilot operation line to the maximum flow rate regulating piston
A pilot pipe interposed in a regulatory pipeline connected to a
And a pressure regulating valve,Regulates the maximum discharge of the hydraulic pump
By solving the above-mentioned problems,
I have. [0008] [Function] During normal drilling work, the hydraulic pump servo
Equivalent horsepower output system with low pressure large flow and high pressure small flow by mechanism
Control of the drill, the drilling rod must have low resistance
It rotates at high speed, and when the resistance is large, it rotates at low speed. Drill
Change, it is necessary to reduce the rotation speed of the rod.
The maximum discharge rate of the hydraulic pump by regulating means.
Thus, low-speed rotation control can be performed. [0009] FIG. 1 is an explanatory view of the configuration of a drilling machine, and FIG.
Hydraulic circuit of drilling machine rotation control device according to one embodiment of the present invention
FIG. 3 and FIG. 3 are characteristic diagrams of the hydraulic pump. Where the drill hole
The machine 1 is mounted on a guide shell 10 and
The guide mechanism 8 moves forward and backward on the guide shell 10. Sa
The boring machine 1 includes a striking mechanism 5 and a rod rotating mechanism 7.
Hits and rotates the mounted shank rod 4
You. The shank rod 4 is fitted with a bit 9 at the front end.
2 is connected by a sleeve 3 and a shank rod
The impact and rotation given to 4 are carried out by bit 9 via rod 2
Is transmitted to A hydraulic motor 6 for driving a rod rotating mechanism 7
From the service ports A and B of the rotation control valve 11
The pipes 12a and 12b are connected, and the flow of the rotation control valve 11 is controlled.
The inlet port P has a discharge line of the variable displacement hydraulic pump 13.
14 are connected. Return port of control valve 11 for rotation
R is connected to the tank 15. The rotation control valve 11
3 position pilot operated switching valve
PLa and PLb are the reverse-side pilot operation pipelines 18a,
The rotation operation valve 16 and the rotation operation valve 16
It is connected. The operator operates the rotary operation valve 16.
By operating to the forward rotation side or the reverse rotation side, the auxiliary pump 1
7 to the pilot port PLb or PLa
Thus, the rotation control valve 11 can be switched. A variable displacement hydraulic pressure driven by the engine E
The pump 13 includes a well-known servo mechanism 20,
The output hydraulic pressure is the starting pressure P₁Is reached, it is pushed by the switching piston 21
Spool 22 against offset spring 23
The balance piston 24 moves to the communication side,
Balance at the initial position with the ring 25.
High pressure P_TwoUntil it reaches (in the characteristic diagram of the hydraulic pump in FIG. 3,
Point O₁From point O_TwoUntil the oil pressure increases, the oil amount decreases
The horsepower is controlled as follows. The change in oil amount during this time is Q₁
To Q_TwoUp to. The hydraulic pump 13 has a maximum flow rate regulating pin.
The switching piston 21 is provided with a stone 26.
Slidably inserted into the maximum flow rate control piston 26
You. In the regulating oil chamber 27 of the maximum flow regulating piston 26,
From the forward rotation pilot operation line 18b to the restriction line 28
Is connected in the middle of the regulation line 28.
A lot pressure regulating valve 29 is interposed. During normal drilling work, the hydraulic pump 13
Servo mechanism 20 provides low pressure large flow and high pressure small flow
Since equal horsepower output control is performed, the rod 2 of the drill 1
If the resistance is low, the motor rotates at high speed, and if the resistance is high, it rotates at low speed.
You. Changes in drilling conditions, lowering the rotation speed of rod 2
If necessary, the pilot pressure regulating valve 2
In step 9, the oil pressure in the regulation oil chamber 27 is adjusted. Oil in regulated oil chamber 27
When the pressure is increased, the maximum flow restricting piston 26 moves.
Balance piston 24 and balance spring 25
Initial position O at which horsepower control such as lance is started _iOf FIG. 3
Point O on the characteristic diagram of the hydraulic pump₁From left to hydraulic
Maximum discharge amount Q of pump 13_iDecrease. Therefore, pie
If the pressure of the lot pressure adjusting valve 29 is adjusted, the hydraulic pump
Rotation control is performed by regulating the maximum discharge amount of thirteen
be able to. The pilot pressure regulating valve 29 has a pressure reducing valve,
Or automatic control by computer using proportional pressure reducing valve
The drilling operation becomes easy. The maximum flow rate regulating piston 26 has a pilot
A mechanical adjuster 30 in place of the pressure adjustment valve 29.
You can also go. [0015] As explained above, the drilling machine of the present invention
Rotation control devices open the passages of flow control valves and directional control valves.
Drilling without using difficult flow control means such as
Make sure that fine-grained rotation control is performed according to changes in conditions.
The rod rotation mechanism of the drilling machine and the durability of the rod
And increase the lock due to excessive rotation torque.
To prevent abnormal tightening of the thread of the rod and efficiently thread the rod.
Can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a configuration of a drilling machine. FIG. 2 is a hydraulic circuit diagram of a rotation control device for a drilling machine according to one embodiment of the present invention. FIG. 3 is a characteristic diagram of a hydraulic pump. DESCRIPTION OF SYMBOLS 1 Drilling machine 2 Rod 3 Sleeve 4 Shank rod 5 Striking mechanism 6 Hydraulic motor 7 Rod rotating mechanism 11 Rotation control valve 12a Main pipeline 12b Main pipeline 13 Hydraulic pump 14 Discharge pipeline 16 Rotating operation valve 17 Auxiliary pump 18a Reverse rotation side pilot operation line 18b Forward rotation side pilot operation line 20 Servo mechanism 21 Switching piston 22 Spool 23 Offset spring 24 Balance piston 25 Balance spring 26 Maximum flow rate regulating piston 27 Regulatory oil chamber 28 Regulatory pipeline 29 Pilot pressure Regulating valve

Claims (1)

(57) [Claim 1] In a drilling machine equipped with a variable displacement type hydraulic pump as a hydraulic source of a hydraulic motor of a rod rotating mechanism , a maximum flow rate regulating piston is provided to a servo mechanism of the hydraulic pump.
And rotation control interposed in the main line for operating the hydraulic motor
The valve is switched to the forward side.
Control pipe connected to the control oil chamber of the maximum flow control piston
A rotation control device for a drilling machine, comprising: a pilot pressure regulating valve interposed in a path; and a regulating means for regulating a maximum discharge amount of a hydraulic pump.