JPS6029368Y2 - Drilling machine chip shredding device - Google Patents

Description

[Detailed description of the invention] This invention relates to a chip shredding device for a drilling machine.

In order to facilitate the removal of chips in a drilling machine, the chips that wind up in a ribbon shape when drilling a hole are often shredded into appropriate sizes.

To shred, cutting feed may be temporarily stopped.
In some cases, it is done by returning it a little after stopping, but when returning it, apply hydraulic pressure to the pushing side chamber of the piston that feeds the cutting).
Since high hydraulic pressure is applied to the inlet and exit chambers of the piston, a high-pressure pump is required, and the piping is also difficult (due to the strain on the piping), so an accumulator, etc. is used, which has the disadvantage of increasing equipment costs. .

This idea raises the drill in the cutting process for the time determined by the first timer T1, causes it to enter the cutting process for the time determined by the second timer T2, and automatically repeats this process to perform the cutting process. This allows for continuous cutting of medium-sized chips, but the switching valve and piping are devised so that the chamber on the ingress and egress side of the piston always communicates with the tank, making it possible to cut the medium-sized chips continuously. It is an object of the present invention to provide a chip cutting device for a drilling machine, which uses a drill press without using an accumulator or the like and requires low equipment costs.

The structure will be explained based on the illustrated embodiment. As shown in FIG. 1, a hydraulic cylinder 4 is attached to a machine column 1, and a piston 3 whose inside is connected by a drill spindle head 2 and a piston rod 3' moves up and down; a limit switch 6 for the upper limit of piston lift, which cooperates with a limit switch actuating part 5 provided in a part integral with the piston 3, that is, the drill spindle head 2, and a limit switch 7 for continuous lifting movement;
A limit switch 8 for the lower limit of piston descent is provided, and the discharge side pipe line 10 of the hydraulic pump 9 (see Fig. 2) is divided into two.
On the other hand, 11 is a 3-position, 4-port, one-way shutoff electromagnetic directional control valve 12
The pipes 15 and 16 communicate with either the upper or lower chambers a or b of the hydraulic cylinder 4, and the other 13 is connected to the pipe 15' via a 2-position, 2-boat electromagnetic directional control valve 14. The hydraulic pipe line 15 to the lower chamber of the hydraulic cylinder 4
via a check valve 18, and the limit switch 7 for continuous vertical motion is connected to a first timer T1 and a second timer T1.
Connect 2.

In addition, in the drill spindle head 2, a mechanical direction switching rod 25 of a cutting feed control valve 25 of a flow rate control valve type with a deceleration check valve is provided in the middle of the hydraulic line 15 above the limit switch operating section 5. A mechanical direction switching rod 25 for the cutting feed control valve is provided on the machine column 1 above the limit switch 6 for the upper limit of piston rise.
'.

In FIG. 2, when the hydraulic pump 9 is in operation and the start button 23 is pressed, the left solenoid 12□ of the switching valve 12 is energized so that the position A is activated, and the piston 3 is moved to the first position. Then, as the descent progresses, the dragon dog 25'' engages the mechanical direction switching rod 25.
', the feed of the piston (drill head) changes to cutting feed, and as the descent progresses further, the limit switch actuator 5 presses the limit switch 7,
Timer T1 and controller T are now working,
Therefore, when the limit switch operating section 5 operates the limit switch 7 for continuous lifting motion, the timer T and the controller T work, and the right solenoid 12 of the switching valve 12 and the switching valve 14 solenoid 1
41 and 41 respectively, the switching valve 12 is moved to the left so that the central one-way cutoff position opening is activated, and as a result, the upper chamber a of the hydraulic cylinder 4 is made to communicate with the tank 17, Hydraulic pressure is applied to the lower chamber of the hydraulic cylinder 4 through the switching valve 14, so that the piston 3 moves upwards.

In this way, when the first timer T□ rises by the time set, the switching valve 14 is demagnetized and the spring 14□
The switching valve 12 returns to its original position, and at the same time as the operation of the first timer T□ ends, the second timer T2 operates, and the controller t
2, the left solenoid 121 of the switching valve 12 is energized, the switching valve 12 moves to the right, and the position A is activated again to lower the piston 3.

In this way, when the second timer T2 falls by the set time, the controller t□ is activated again and the first timer T1
works and rises for the time set in the first timer T1,
After repeating the upward and downward movements in this manner, when the piston descends, that is, when the limit switch actuating part 5 descends, and the time set by the first timer T1 is still in progress, when it comes into contact with the limit switch 8 for the lower limit of descent, The controller t3 operates and the switching valve 12
The right solenoid 12□ is energized and the piston 3 is raised, and when the limit switch actuating section 5 comes into contact with the upper limit switch 6, the left solenoid 121 of the switching valve 12 is activated and the piston 3 is moved up. position, and the oil supply to the hydraulic cylinder 4 is stopped.

In addition, 24 in Fig. 2 indicates a double pump for check, relief, and unloading valve material, and when the limit switch actuating section 5 performs continuous upward and downward movement, the limit switch does not operate even if it comes into contact with the limit switch 7. It has become.

Furthermore, when the operation of timer T□ is finished, timer T2 is
Further, the structure of the controller 'it t2, which operates the timer T1 after the operation of the timer T2 is completed, is very common, so a detailed description thereof will be omitted.

Since this embodiment has the above-mentioned configuration, the first timer T1 and the second timer T2 are set in advance to the rise time and fall time of the continuous vertical motion, and when the start button 23 is pressed, the switching valve 12 is activated. The piston 3, ie, the drill spindle head 2, descends and enters the drilling process.

Eventually, when the limit switch actuator 5 touches the limit switch 7 for continuous vertical movement, it rises for the time set in the first timer T1, then falls for the certain time set in the second timer T2, and this vertical movement continues. Repeat.

During this time, the chips from the drill are shredded.

In this manner, when the limit switch operating section 5 of the spindle head 2 touches the lower limit switch 8 while the spindle head 2 is descending, the spindle head 2 rises and comes into contact with the upper limit switch 6 to stop the upward movement.

This device has a structural action similar to that of the previous generation, and when the piston is raised and lowered for a time determined by a timer to shred the chips, hydraulic pressure is applied to the top surface of the piston, causing the re-piston to descend, eliminating the need for cutting. The chamber in the direction of movement of the piston, that is, the chamber on the top side, communicates with the tank, so even when the repiston is raised to cut chips (hydraulic pressure is applied to the bottom side of the piston), the chamber in the direction of movement of the piston, that is, the chamber on the top side, communicates with the tank. (In order to return the piston, there is hydraulic pressure on one side of the piston for cutting)
Since a high-pressure pump is used to apply hydraulic pressure to the opposite side of the piston to overcome this, and there is no need to install an accumulator or the like in the hydraulic circuit, equipment costs are low and chips are easily cut. It is possible to provide a chip shredding device for a drilling machine.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of a chip shredding device for a drilling machine according to this invention, and Fig. 2 is a hydraulic system diagram, in which 1 is a machine column, 2 is a drill spindle head, and 3 is a hydraulic system diagram. is a piston, 4 is a hydraulic cylinder, 5 is a limit switch operating part, 6 is a limit switch for upper limit of rise, 7 is a limit switch for continuous lifting movement, 8 is a limit switch for lower limit of fall, 9 is a hydraulic pump, 10 is a discharge side pipe 11 is one side of the conduit 10 divided into two, 12 is a 3-position 4-port electromagnetic directional control valve, 13 is the other side of the bisected conduit 10, 14 is a 2-position 2-port electromagnetic directional control valve, 15 is a hydraulic pipe 16 is a check valve,
T□ indicates a first timer, and T2 indicates a second timer.

Claims (1)

[Scope of utility model registration request] A hydraulic cylinder 4 in which a piston 3 whose interior is integral with a drill spindle head 2 moves up and down is installed on the machine column 1, and a hydraulic cylinder 4 for raising and lowering the piston that cooperates with a limit switch operating section 5 provided in a part integral with the piston 3. A limit switch 6, a limit switch 7 for continuous vertical movement, and a limit switch 8 for lower limit of piston descent are provided, and the discharge side pipe 10 of the hydraulic pump 9 is divided into two, while the one 11 is 3 positions, 4 ports, and one is cut off in the electromagnetic direction. The switching valve 12 communicates with either the upper or lower chambers a and b of the hydraulic cylinder 4, and the other chamber 13
is connected to the hydraulic line 15 to the lower chamber of the hydraulic cylinder 4 via the 2-position 2-port electromagnetic directional control valve 14 via the check valve 18, and the continuous lifting movement limit switch 7
connects the first timer T and the second timer T2,
When the limit switch actuator 5 actuates the limit switch 7 for continuous lifting movement when the piston 3 first descends, the three-position switching valve 12 is placed at the middle one cutoff position and the upper part of the hydraulic cylinder 4 is opened. The chamber a is made to communicate with the tank 17, and the two-position switching valve 14 is operated to apply hydraulic pressure to the lower chamber of the hydraulic cylinder 4 to reversely raise the piston 3, and the first timer is activated. T□
After rising for the time set in T2, both switching valves 12 and 14 return to the original piston lowering position, and the piston 3 is lowered for the time set in the second timer T2. The 3-position and 2-position switching valves 12 and 14 are moved to the piston raising position and this is repeated, and when the limit switch operating section 5 operates the lower limit lower limit switch 8, the limit switch operating section 5 moves upward.
When the upper limit switch 6 is activated, the 3-position switching valve 12 is placed in the central one cutoff position and the piston 3
A chip shredding device for a drilling machine, characterized in that the movement of the machine is stopped.