JP2572361B2 - Drilling machine 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 a method for cutting a workpiece such as reinforced concrete, concrete, rock, asphalt, etc.
The present invention relates to a drilling machine capable of drilling, and more particularly to a control device that controls the operation of the drilling machine according to various conditions.

[0002]

2. Description of the Related Art A conventional drilling machine of this type is known as a device for cutting and drilling a workpiece such as reinforced concrete, concrete, rock or asphalt.

[0003] Such a drilling machine includes a rotary drive transmitting section for rotating a core bit, a feed mechanism for moving the core bit forward and backward, a feed drive transmitting section for driving the feed mechanism, a column for supporting the same, and each of the members. And a gantry that is used to fix the device to a workpiece. The drilling machine is connected to a control device via a connection cable, and the control device automatically controls the cutting and drilling operations of the drilling machine. This control device has an operation panel, has an electronic control circuit inside, and is configured such that the operation procedure shown in FIG. 10 can be realized in advance, so that the operation of the operation panel can be performed. Accordingly, the electronic control circuit operates to implement various control operations. In addition, in the wet drilling machine, in order to cool the core bit, cooling water is guided to the core bit, and supply / stop of the cooling water is adjusted by a cooling water supply valve.

[0004] Here, the rotation drive transmission section includes an electric motor and a speed reducer. The feed mechanism can be composed of a combination of a rack and a pinion. The feed drive transmission unit includes an electric motor and a speed reducer. In the above-described drilling machine, cutting and drilling operations are controlled by the control device as follows.

FIG. 14 is a flowchart showing an operation procedure of the drilling machine by the conventional control device.

First, when a start switch provided in the control device is turned on (step 100), the control device rotates the motor of the rotary drive transmission unit (step 101), and simultaneously rotates the motor of the feed drive transmission unit (step 101). Step 10
2). Next, a current value to be generated by the electric motor of the rotation drive transmission unit is set in a setting device provided on the front surface of the control device (step 103). As a result, the core bit rotates through the speed reducer of the rotary drive transmission unit, and the feed mechanism is driven through the speed reducer of the feed drive transmission unit, so that the workpiece is perforated.

At this time, the control device detects a current flowing through the motor of the rotary drive transmission unit, and determines a current value flowing into the motor and a reference set value set in the setting device (for example, the rated current value of the motor). ) Is compared (step 104). When the motor current is smaller than the reference set value, a current is caused to flow so as to increase the rotation of the motor of the feed drive transmission unit (step 105). When the motor current is larger than the reference set value, An electric current is supplied so that the rotation of the electric motor of the drive transmission unit decreases (step 106).

As described above, when the cutting feed speed of the core bit is increased or decreased, the cutting resistance is increased or decreased, and as a result, the current value of the rotary drive transmitting section is increased or decreased. The drilling operation can be performed while always maintaining the load current of the motor of the section near the rated current value. Further, since the motor of the rotary drive transmission unit generally uses a commutator motor, the load current increases and decreases in the same tendency as the increase and decrease of the torque. Therefore, even if the cutting resistance is increased or decreased by increasing or decreasing the cutting feed speed of the core bit, the control device controls the electric current of the electric motor of the rotary drive transmission unit to be a torque near the rated current value by using the above characteristics. be able to.

Next, the control device determines whether the current flowing into the motor of the rotary drive transmission unit is overloaded (step 10).
7) If it is normal, it is further determined whether or not the current value of the electric motor of the rotation drive transmission unit is extremely low (step 108).
If it is not extremely low, it is determined that the cutting operation is being performed, and the process returns to step 104. In other words, the control device repeatedly executes the operations of steps 104 to 108 during the cutting / piercing operation.

On the other hand, if the control device determines in step 108 that the current of the motor of the rotary drive transmitting section has a very low value, it determines that the cutting operation has been completed and stops the motor of the rotary drive transmitting section (step 108). 109) At the same time, the motor of the feed drive transmission unit is stopped (step 110).

On the other hand, during the cutting, the control device
If it is determined in step 7 that the load current of the motor of the rotation drive transmission unit has increased to an overload, an alarm buzzer is sounded, and an abnormality notification such as turning on an abnormality indicator lamp is performed (step 11).
1) At the same time, the motor of the rotation drive transmission unit is stopped (step 109), and the motor of the feed drive transmission unit is stopped at the same time (step 110).

In a wet drilling machine, an operator opens a cooling water supply valve and supplies cooling water before starting cutting, and after completion, closes a cooling water supply valve and stops supplying cooling water. ing. In such a conventional drilling machine, monitoring and protection in the case of abnormally low cooling water are not performed. In addition, as a device related to this kind, “Diamond core drill fully automatic device” described in a catalog issued by Haken Co., Ltd. can be mentioned.

[0013]

In the conventional wet drilling machine control device, the cooling water supplied to the drilling machine is supplied to the drilling machine by an operator by opening the valve before starting and by starting the valve after cutting is completed. It was necessary to close and stop the supply.
Further, when the amount of cooling water is reduced during cutting, if the operator does not notice this, the temperature of the cutting edge of the core bit is increased due to damage, and cutting cannot be continued.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control device for a drilling machine which solves the above-mentioned problems of the conventional device, reduces the labor of the operator, and prevents the core bit from being damaged.

[0015]

SUMMARY OF THE INVENTION An object of the present invention is to drive a rotation drive transmitting unit including a first electric motor for rotating a core bit, a feed mechanism for moving the core bit forward and backward, and a second electric motor for driving the feed mechanism. A control device for controlling the operation of a drilling machine including a feed drive transmitting unit, comprising: a cooling water supply unit configured to supply cooling water to a core bit; a control valve provided in a passage of the cooling water supply unit; Means for detecting the amount of cooling water provided in the passage of the means, and opening the control valve at startup, closing the control valve when the core bit reaches the target point and a target point arrival signal is input, and stopping the device, or Control means for closing the control valve when the cooling water amount decrease signal is input from the cooling water amount detecting means and for reversely rotating the second electric motor to return to the original position. Is accomplished by a controller of the drilling machine, characterized.

The object of the present invention is to provide a rotary drive transmitting unit including a first motor and rotating a core bit, a feed mechanism for moving the core bit forward and backward, and a feed drive transmitting unit including a second motor and driving the feed mechanism. In a control device for controlling the operation of the drilling machine provided, a cooling water supply means for supplying cooling water to the core bit, a control valve provided in a passage of the cooling water supply means, and a control valve provided in a passage of the cooling water supply means Cooling water amount detecting means, the control valve is opened at the time of starting, the control valve is closed and the device is stopped when a core bit reaches a target point and a target point reaching signal is input, or from the cooling water amount detecting means. A control means for closing the control valve when the cooling water amount lowering signal is input and for reversing the second electric motor to return to the original position; and Is accomplished by a controller of the drilling machine, characterized in that a abnormal state informing means for issuing an alarm based on 却水 decrease signal.

Further, the target point arrival signal is obtained by target point arrival detection means.

Further, the abnormal condition notifying means is constituted by a cooling water amount decrease indicator lamp.

In addition, the abnormal state notifying means is constituted by an abnormal state sound alarm.

[0020]

With the above construction, the control means automatically opens the control valve at the time of starting, and when the core bit reaches the target point and a target point arrival signal is input, the control means opens the control valve. Closing and shutting down the device. With this configuration, the cooling water is automatically supplied to the cutting surface of the core bit, and when the cutting is completed, the device is stopped, and the supply of the cooling water is stopped. There is no need for this, and since the processing is performed automatically, the labor of the operator can be reduced.

Also, with the above-mentioned configuration, when a cooling water amount decrease signal from the cooling water amount detecting unit is input to the control unit, the control unit performs control to close the control valve, Motor is reversed to return to the original position. Further, when the cooling water amount reduction signal is output, an alarm can be issued to notify the worker of the cooling water abnormality. By doing so, damage to the cutting edge of the core bit due to lack of cooling water can be prevented, and there is no need to constantly monitor the state of cooling water supply to the cutting edge of the core bit. It is not necessary for the operator to take any action, and the warning of the cooling water abnormality can be immediately known by the alarm, so that the countermeasure for the abnormality can be taken quickly.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 13 are for explaining an embodiment of the present invention. Here, FIG. 1 is a perspective view showing an embodiment of a drilling machine control device of the present invention, FIG. 2 is a front view showing an operation panel of the embodiment, FIG. 3 is a block diagram showing the embodiment, FIG.
5 is an overall configuration diagram of a sequence for explaining the operation of the embodiment, FIG. 5 is a configuration diagram showing details of a block B100 part of FIG. 4, and FIG. 6 is a configuration diagram showing details of a block B200 portion of FIG. 7 is a configuration diagram showing details of a block B300 portion in FIG. 4, FIG. 8 is a configuration diagram showing details of a block B400 portion in FIG. 4, FIG. 9 is a characteristic diagram showing a relationship between torque and load current of the AC commutator motor, FIG. 10 is a characteristic diagram showing the relationship between the load current and the rotation speed of the AC commutator motor, FIG. 11 is a characteristic diagram showing the relationship between the rotation speed of the core bit and the peripheral speed of the cutting edge of the core bit, and FIG. FIG. 13 is a characteristic diagram showing the relationship between the speed and the cutting feed speed, and FIG. 13 is a time chart showing the relationship between the load current and the feed speed of the first motor during the cutting operation.

The embodiment shown in FIG. 1 includes a drilling machine 1 and a control device 3, and the drilling machine 1 and the control device 3 are connected via a connection cable 5.

The drilling machine 1 is provided with a bit rotation motor 11 and a speed reducer 12, a rotation drive transmission unit 14 for rotating the core bit 13, a feed mechanism 15 for moving the core bit 13 forward and backward, a bit feed motor 16 and Feed drive transmission unit 1 including reduction gear 17 and driving feed mechanism 15
8, a support 19 for supporting these members, and a gantry 20 used for mounting each member and fixing the member to a workpiece. The gantry 20 is fixed to the workpiece by the anchor bolt 21. Also, the feed mechanism 15
Is provided with a manual feed handle 22.

The core bit 13 is connected to an output shaft of the speed reducer 12 via a tube 23. Cooling water is supplied to the core bit 13 via a cooling water supply hose 24 as cooling water supply means. In the passage of the cooling water supply means, a control valve 25 and a cooling water amount detector 31 are provided.

The control device 3 has an operation panel 30 shown in FIG. 2 and also has an electronic control means shown in FIG. 3 therein, and the operation procedure shown in FIGS. With such a configuration, the electronic control unit operates in accordance with the operation of the operation panel 30 and the like, thereby realizing various control operations. The control device 3 is mainly composed of a microcomputer and other electronic circuits, and includes a cooling water amount detector 31.
An input voltage detector 32 of the bit feed motor 16;
Rotation speed detector 33 of bit feed motor 16, bit feed speed detector 34, bit size selector 35, load current detector 36 of bit rotation motor 11, bit moving distance detector 37, cutting The detection signals from the distance setting unit 38, the bit origin position detector 39, the start switch 40, and the stop switch 41 are taken in, and the control sequences shown in FIGS. The cooling water amount detector 3
1, a rotation speed detector 33, and a bit feed speed detector 3
4, a bit moving distance detector 37, and a bit origin position detector 39 are respectively provided at predetermined locations, and the other detectors (32, 36) are provided in the control device 3, Operation switches and the like (35, 38, 40, 41) are provided on the operation panel 30.

The operation panel 30 of the control device 3 is shown in FIG.
It is configured as shown in FIG. In the operation panel 30, 45 is a power switch, 46 is a cutting distance indicator, 47
Is a cutting control selection, 48 is a current / speed setting device, 49 is a forward / reverse switch of the bit feed motor 16, 50 is a distance setting changeover switch, 51 is a set distance reset switch, 52 is an abnormality display reset switch, 53 Is an abnormality indicator of the bit rotation motor 11, 54 is a cutting impossible indicator,
55 is a cutting completion display, and 56 is a bit rotating electric motor 11.
Is a load current meter.

Next, as shown in FIG. 3, the control device 3 comprises a first control means 3A, a second control means 3B, a third control means 3C, a fourth control means 3D, and a fifth control means. The unit 3E can be realized. Each first control means 3A-
The configuration up to the fifth control unit 3E will be described with reference to FIGS.

FIG. 4 shows the relative positional relationship between the blocks B100 to B400 realizing the control sequence of the control device according to the present embodiment.
At 400, the following signals are handled and given to other blocks. In addition, the content of the controlled part that is finally controlled is shown in the block B400. Then, in the block B100, a cutting target current value 302 of the first electric motor and a cutting feed speed abnormal decrease signal 330 are formed, and the cutting target current value 302 is stored in the block B400.
The cutting feed speed abnormally low signal 330 is supplied to the block B300. In block B200, the load current value signal 303, the rotation speed low limit signals 319 and 320, the soft start signal 316, the distance coincidence signal 322, and the cutting penetration signal 321 are formed, respectively.
The rotation speed low limit signals 319 and 320 and the soft start signal 316 are supplied to the block B400, and the distance match signal 322 and the cutting penetration signal 321 are supplied to the block B300. In the block B300, a start signal 306, a stop signal 307, a cooling water amount decrease signal 333, a forward / reverse rotation signal 323, an original position detection signal 324, and a forward / reverse rotation repetition number signal 326 can be output. This is given to the block B400. And
The detailed configuration of each of the blocks B100 to B400 is shown in FIG.
FIG. 7 shows the configuration of the block 200, FIG. 7 shows the configuration of the block B300, and FIG. 8 shows the configuration of the block B400. The positional relationship between them is shown in FIG.

The first control means 3A includes a current value setting means 201 for setting a cutting target current value 302 of the first electric motor in response to a selection signal 301 from a bit size selector 35 for selecting a size of a core bit, The load current 303 detected by the load current detector 36 for detecting the load current of the bit rotating motor 11, which is a motor, is compared with the cutting target current value 302 from the current value setting means 201, and a deviation signal 304 is obtained.
And a bit feed motor 16 such that the deviation signal 304 from the comparison circuit 202 becomes zero.
And a bit feed motor control circuit 203 that outputs a control signal 305 for controlling

A modification of the first control means 3A is a feed mechanism 1
5, a feed speed detecting means 204 for detecting the speed at which the core bit 13 is sent;
The current value setting means 201 sets the cutting target current value 302 of the bit rotating electric motor 11 in accordance with the hardness determination signal 312 from the motor, and the load current detector 36 detects the load current of the bit rotating electric motor 11. A comparison circuit 202 that compares the load current with the cutting target current value 302 from the current value setting means 201 to form a deviation signal 304; and a bit feed motor so that the deviation signal 304 from the comparison circuit 202 becomes zero. And a bit feed motor control circuit 203 for outputting a control signal 305 for controlling the rotation of the motor 16.

Here, in a modified example of the first control means 3A, the feed speed detecting means 204 includes an input voltage value signal 308 of the input voltage detector 32, a rotation speed signal 309 from the rotation speed detector 33, or a bit signal. Cutting feed speed classification circuit 2 which takes in any of feed speed signals 310 from feed speed detector 34 and forms cutting feed speed value signal 311
04a, and a workpiece hardness determination circuit 204b that takes in the cutting feed speed value signal 311 from the speed classification circuit 204a to form a hardness determination signal 312.

When the start switch 40 is depressed and the start signal 306 is input, the second control means 3B outputs the soft start signal 3
16 and an operation state judgment circuit 206 for outputting a rotation speed signal 16 and a soft start signal 316 from the operation state judgment circuit 206 to reduce the rotation speed of the bit rotation motor 11 and the bit feed motor 16 to a fixed low value. The limit signals 319 and 320 are formed and sent to the motor control circuit 203 and the bit rotation motor control circuit 207, respectively.
And a soft start control circuit 209 as a start control unit for releasing the above-mentioned restriction by a release signal 350 from the predetermined condition establishment means 250 and bringing the rotation to a desired state.

Here, in the second control means 3B, the condition satisfaction means 250 determines that the detection signal from the load current detector 36 for detecting the load current of the bit rotation motor 11 exceeds a preset value. The bit rotation motor current determination circuit 208 may be configured to output the release signal 318.

In the second control means 3B, the condition satisfaction means 250 comprises a soft start release timer 211 which outputs a release signal 317 after the time set by measuring the time by the soft start signal 316 at the time of start. May be.

Further, in the second control means 3B, the condition fulfilling means 250 includes a bit moving distance detector 37 for detecting the moving distance of the core bit 13, a cutting distance setting device 38 for setting the cutting moving distance, Cutting distance setting device 3
8 based on the distance setting signal 313 and the moving distance signal 314 from the bit moving distance detector 37.
Is determined to have reached the target cutting point, and the soft start release signal 3
And a cutting determination circuit 210 that outputs the signal 15.

The third control means 3C comprises: a bit origin position detector 39 for detecting the original position of the core bit 13 before starting;
Target point arrival detection means 260 for detecting that core bit 13 has reached the target point and outputting target point arrival signal 360
And a control signal 328 for reversing the bit feed motor 16 in response to the target point arrival signal 360 from the target point arrival detection means 260, and the bit origin position detector 39 indicating that the core bit 13 has returned to the original position. An operation state determination circuit 206 that outputs a start / stop operation signal 327 for stopping the bit rotation motor 11 and a control signal 328 for stopping the bit feed motor 16 when detected.
It is composed of Here, in the third control means 3C, the target point arrival detection means 260 includes a bit movement distance detector 37 for detecting the movement distance of the core bit 13.
And a cutting distance setting device 38 for setting a cutting moving distance, a target bit cutting based on a distance setting signal 313 of the post-starting cutting distance setting device 38 and a moving distance signal 314 from the bit moving distance detector 37. And a cutting determination circuit 210 that outputs a target point arrival signal (distance coincidence signal) 322 by determining that a point has been reached.

In the third control means 3C, the target point arrival detecting means 260 detects in advance the load current value signal 303 which is a detection signal from the load current detector 36 for detecting the load current of the bit rotating motor 11. A bit rotation motor current determination circuit 208 that outputs a target point arrival signal (cutting hole penetration signal) 321 when the value exceeds a set value may be used.

The fourth control means 3D includes a cutting speed abnormality detecting means 270 for detecting that the cutting speed has dropped abnormally,
A forward / reverse rotation means 280 for rotating the bit feed motor 16 in reverse by a cutting feed speed abnormality lowering signal 330 from the cutting speed abnormality detection means 270 and rotating the second motor forward after a certain time limit; It comprises a repetition number counting circuit 214 as repetition means for repeating the operation a fixed number of times.

Here, in the fourth control means 3D, the abnormal cutting speed detecting means 270 detects the bit feed motor 1
6 is a cutting feed speed classification circuit that outputs a cutting feed speed abnormal decrease signal 330 due to an abnormal decrease in the input voltage.
04a. In the fourth control means 3D, the cutting speed abnormality detecting means 270 outputs a cutting feed speed abnormally low signal 330 due to an abnormal decrease in the rotation speed of the bit feed motor 16 in the cutting feed speed classification circuit 204a. You may comprise.

Further, in the fourth control means 3D, the cutting speed abnormality detecting means 270 detects the cutting speed when the bit feeding speed detector 34 for detecting the feeding speed of the feeding mechanism 15 detects that the cutting speed is abnormally low. It may be configured by a cutting feed speed classification circuit 204a that outputs the abnormal speed reduction signal 330.

The fifth control unit 3E has a cooling water supply means 24 for supplying cooling water to the core bit 13, a control valve 25 in a passage of the cooling water supply means 24, and opens the control valve 25 at the time of starting. The circuit configuration is such that the control valve 25 is closed after the cutting is completed. To make this circuit configuration, the bit feed motor forward / reverse rotation determination circuit 212
The operation state determination circuit 206, the bit rotation motor control circuit 207, and the bit feed motor control circuit 203 are used.

Here, in the fifth control section 3E, the completion of cutting may be performed by the target point reaching signal 360 from the target point reaching detecting means 260. As another embodiment of the fifth control unit 3E, a cooling water supply means 24 for supplying cooling water to the core bit 13 is provided, and a control valve 25 and a cooling water amount detector 31 are provided in a passage of the cooling water supply means 24. And opening the control valve 25 at startup,
The control valve 31 may be closed when the cooling water amount decrease signal 333 is input from the cooling water amount detector 31, and the circuit may be configured to stop the device. To achieve this circuit configuration, a bit feed motor forward / reverse rotation determination circuit 212, an operation state determination circuit 206, a bit rotation motor control circuit 207, and a bit feed motor control circuit 203 are used.

Further, as another embodiment of the cooling water amount detector 31, a cooling water supply means 24 for supplying cooling water to the core bit 13 is provided.
The control valve 25 and the cooling water amount detector 31 are provided in the passage of, and the control valve 25 is opened at the time of starting, and the control valve 31 is closed when the cooling water amount decrease signal 333 from the cooling water amount detector 31 is input. In addition to the above, a circuit configuration for controlling the bit feed motor 16 to reverse and return to the original position may be adopted. To achieve this circuit configuration, a bit feed motor forward / reverse rotation determination circuit 212, an operation state determination circuit 206, a bit rotation motor control circuit 207, a bit feed motor control circuit 203, a bit origin position detection The container 39 is used.

The operation state judging circuit 206 includes a cutting start indicator 401, a cutting stop indicator 402, a cutting completion indicator 403, and an overcurrent indicator 40 of the bit rotating motor 11.
5. Connected to the feed speed abnormally low indicator light 406 and the cooling water level decrease indicator light 408 to perform a predetermined display, and connected to the cutting completion sound alarm 404 and the abnormal state sound alarm 407 to perform predetermined sound alarm. It has become.

The operation of the embodiment configured as described above will be described. [Operation of First Control Means 3A] First, the size of the core bit 13 attached to the rotation drive transmission unit 14 including the speed reducer 12 is set in the bit size selector 35. Then, the start switch 40 is pressed. This causes the device to operate. Here, the soft start operation after the start switch 40 is pressed will be described later, and the cutting operation will be described first. Then, from the bit size selector 35,
The selection signal 301 is output and input to the current value setting means 201. In the current value setting means 201, the selection signal 3
The value of the current flowing through the bit rotating electric motor 11 is determined based on 01, and is output as the cutting target current value 302. The cutting target current value 302 is input to the comparison circuit 202. The comparison circuit 202 compares the load current value signal 303 from the load current detector 36 with the cutting target current value 302 to form a deviation signal 304 and supplies it to the bit feed motor control circuit 203. Thereby, the bit feed motor 1 is controlled so that the rotation of the bit feed motor 16 is increased or decreased.
6 is controlled. Accordingly, by performing such control, when the operator presses the start switch 40, the load current of the bit rotating motor 11 matches the cutting target current value 302 set according to the size of the core bit 13 to be used. The feed speed of the core bit 13 is adjusted so that

The effectiveness of the control as described above can be confirmed for the following reasons. FIG.
FIG. 2 is a diagram confirming by experiment the relationship between the peripheral speed of the cutting edge of the core bit and the cutting feed speed when the torque is kept constant.
In FIG. 12, the torque is fixed at 1.65 [kg-m],
α indicates the relationship at the concrete portion (1), β indicates the relationship at the concrete portion (2), γ indicates the relationship at the reinforcing bar portion (1), and δ indicates the relationship at the reinforcing bar portion (2). . As can be seen from the drawing, the peripheral speed of the cutting edge of the core bit 13 is optimally in the range of about 180 to 190 [m / min]. Generally, as shown in FIG. 11, there is an appropriate range regardless of the size of the core bit 13. In addition, a commutator motor is generally used for the bit rotation motor 11, and the load current (I) of the bit rotation motor 11 increases with the rotation speed (N). . Therefore, as shown in FIG.
Since the rotation speed of the core bit 13 can be determined in accordance with the dimension of No. 3, the cutting target current value 302 of the bit rotation motor 11 can be obtained according to the rotation speed (N) of the bit rotation motor 11 from the relationship of FIG. Since the current (I) and the torque (T) are proportional to each other as shown in FIG. 9 and FIG.
The rotation of the bit feed motor 16 is controlled. Therefore, the core bit 13 rotates at the peripheral speed of the core bit 13 according to the dimension of the core bit 13. Then, as shown in FIG. 13, cutting is performed according to the concrete and the reinforcing bar.

[Operation of Modification of First Control Means 3A] On the other hand, the input voltage value 308 from the input voltage detector 32, the rotation speed signal 309 from the rotation speed detector 33, and the feed from the bit feed speed detector 34 The speed signal 310 is supplied to the cutting feed speed classification circuit 204a. In the cutting feed speed dividing circuit 204a, a cutting feed speed value signal 311 divided into several speed ranges and formed is supplied to the work hardness determining circuit 204b. Circuit for determining hardness of workpiece 20
In 4b, depending on the section range of the cutting feed speed, for example, it is determined that the lower the section is, the harder the section is, and the hardness determination signal for increasing the rotation of the bit rotating electric motor 11 in order to increase the cutting force accordingly. 312 is output.
The hardness determination signal 312 is input to the current value setting means 201. In the current value setting means 201, the hardness determination signal 3
Then, a cutting target current value 302 corresponding to 12 is set and sent to the comparison circuit 202. In the comparison circuit 202, the load current detector 3
6 and the cutting target current value 3
02 and a deviation signal 304 is formed and supplied to the bit feed motor control circuit 203. Thereby, the rotation of the bit feed motor 16 is controlled so that the rotation of the bit feed motor 16 is increased or decreased. Therefore, by performing such control, the operator can use the start switch 4
When 0 is pressed, the core bit 13 is set so that the load current of the bit rotating motor 11 matches the cutting target current value 302 set according to the size of the core bit 13 to be used.
Is adjusted. Note that the control as described above is effective for the same reason as described above.

[Operation of Second Control Means 3B] The start switch 40 is depressed and the start signal 306 is output to the operation state judgment circuit 20.
6, a soft start signal 316 is output. The soft start signal 316 is output from the soft start control circuit 209.
Given to. The soft start control circuit 209 generates rotation speed low limit signals 319 and 320 for limiting the rotation speeds of the bit rotation motor 11 and the bit feed motor 16 to certain low values.
To the feed motor control circuit 203 and the bit rotation motor control circuit 207, respectively. As a result, the feed speed of the core bit 13 decreases, and the peripheral speed of the cutting edge of the core bit 13 decreases.

Next, a release signal 350 from the condition satisfaction means 250 for detecting that a predetermined condition has been established is given to the soft start control circuit 209. As a result, the soft start control circuit 209 releases the restriction and stops the output of the rotational speed low limit signals 319 and 320, so that the bit rotation motor 11 and the bit feed motor 16 are brought into the desired rotation state.

Here, in the second control means 3B, the condition fulfilling means 250 sends the release signal 350 as follows.
To form The load current value signal 303 from the load current detector 36 is supplied to a bit rotation motor current determination circuit 208. In the bit rotation motor current determination circuit 208,
When the load current value signal 303 exceeds a preset value, a release signal 318 is output. This release signal 31
8 is a release signal 350 which becomes the soft start control circuit 20
9 is input.

In the second control means 3B, the condition fulfilling means 250 forms the release signal 350 as follows. The soft start release timer 211 that counts the time with the soft start signal 316 at the time of starting gives a release signal 317 output after the set time has elapsed to the soft start control circuit 209 as a release signal 350.

Further, in the second control means 3B, the condition satisfaction means 250 outputs the release signal 350 as follows.
To form The moving distance of the core bit 13 is detected by the bit moving distance detector 37 to obtain a moving distance signal 314. The cutting distance is set in advance in the cutting distance setting unit 38, and the set value is supplied to the cutting determination circuit 210 as a distance setting signal 313. Cutting judgment circuit 21
At 0, the distance setting signal 31 of the post-starting cutting distance setting device 38
3 and the moving distance signal 3 from the bit moving distance detector 37
When it is determined that the core bit 13 has reached the target cutting point based on 14, a soft start release signal 315 is output.
The soft start release signal 315 is input to the soft start control circuit 209 as a release signal 350.

With the above operation, when the operator turns on the start switch 40, the bit feed cutting speed and the rotation speed of the core bit 13 are limited to a low value, and the cutting edge of the core bit 13 hits the workpiece to start cutting. Since the restriction is released at a certain point, the cutting edge of the core bit 13 at the start of the drilling does not run out, and no impact is received.

[Operation of Third Control Means 3C] The moving distance signal 314 from the bit moving distance detector 37 is given to the cutting judgment circuit 210. When the moving distance signal 314 matches the distance setting signal 313 set by the cutting distance setting device 38, the cutting determination circuit 210 outputs a target point reaching signal (distance matching signal) 322. The target point arrival signal (distance match signal) 322 is sent to the bit feed motor forward / reverse rotation determination circuit 212. The bit feed motor forward / reverse rotation determination circuit 212 supplies the operation state determination circuit 206 instead of the reverse rotation signal 323. The operation state determination circuit 206 converts the signal into a control signal 328 and supplies the control signal 328 to the bit feed motor control circuit 203. Thus, the bit feed motor control circuit 203 reverses the bit feed motor 16 and pulls out the core bit 13.

The core bit 13 is pulled out as described above, and the bit origin position detector 39 outputs the core bit 13.
Is returned to the home position, the home position detection signal 324 is output. The operation state determination circuit 206 takes this in and performs the following operation. In the operation state determination circuit 206,
It is determined that the core bit 13 has been removed, the start / stop operation signal 327 is given to the bit rotation motor control circuit 207, and the control signal 328 is sent to the bit feed motor control circuit 2
Give to 03. Thus, the bit rotation motor 11 and the bit feed motor 16 stop rotating. Further, the operation state determination circuit 206 outputs the origin position detection signal 32
4 is input, the display of cutting completion is displayed on the cutting completion indicator 4
03 is turned on, and the cutting completion sound alarm 404 is sounded to notify.

Since control is performed in this manner, if the operator sets the cutting distance in the cutting distance setting device 38 in advance, drilling is started only by pressing the start switch 40, and thereafter the original position is set. The operator does not need to perform any operation. In the third control means 3C, the target point arrival signal (distance coincidence signal) 322 is obtained from the target point arrival detection means 260 as follows.

The moving distance is set in the cutting distance setting unit 38 in advance. Then, a distance setting signal 313 is provided from the cutting distance setting device 38 to the cutting determination circuit 210. When the cutting operation starts, a moving distance signal 314 is input to the cutting determination circuit 210 from the bit moving distance detector 37. The cutting determination circuit 210 compares the distance setting signal 313 and the moving distance signal 314, and when they match, determines that the core bit 13 has reached the target cutting point and outputs a target point reaching signal (distance matching signal) 322. I do. This allows
A target point arrival signal (distance match signal) 322 is obtained.

In the third control means 3C, the target point arrival detection means 260 may obtain the target point arrival signal (distance coincidence signal) 322 as follows.

That is, the bit rotation motor current determination circuit 208 outputs the load current value signal 30 detected by the load current detector 36 for detecting the load current of the bit rotation motor 11.
3 and determines that this exceeds a preset value, and outputs a target point reaching signal (cutting hole penetration signal) 321. Therefore, the target point reaching signal (cutting hole penetration signal) 321 may be used.

[Operation of Fourth Control Means 3D] When the abnormal cutting speed is detected by the abnormal cutting speed detecting means 270, the cutting feed speed abnormally low signal 330 is outputted in the cutting feed speed dividing circuit 204a. You. The abnormal cutting feed speed reduction signal 330 from the cutting feed speed classification circuit 204a is input to the forward / reverse rotation means 280. When the cutting feed speed abnormally low signal 330 is input, the forward / reverse rotation unit 280 rotates the bit feed motor 16 in the reverse direction, and after a certain time period, rotates the bit feed motor 16 in the normal direction. The operation of the forward / reverse rotation means 280 is repeated a predetermined number of times by the repetition number counting circuit 214.

The repetition count circuit 214 counts this repetition, and outputs a signal 326 to the operation state judgment circuit 206 when the repetition is repeated, for example, three times. The operation state determination circuit 206 supplies a start / stop operation signal 327 to the bit rotation motor control circuit 207 and a control signal 328 to the bit feed motor control circuit 203, respectively. Thereby, the bit rotation motor 11 and the bit feed motor 16 are stopped. In addition, the operation state determination circuit 206
A signal 332 is output to sound the abnormal state sound alarm 407 and notify the same, and the abnormally low feed speed indicator 406 is displayed.
Lights up.

Here, in the fourth control means 3D,
The abnormal cutting feed speed signal 330 detected by the abnormal cutting speed detecting means 270 is detected as follows.
That is, since the cutting feed speed classification circuit 204a outputs the cutting feed speed abnormally low signal 330 due to the abnormal decrease in the input voltage of the bit feed motor 16, it is used.

In the fourth control means 3D, the abnormal cutting feed speed signal 330 detected by the abnormal cutting speed detecting means 270 is detected as follows. That is, since the cutting feed speed classification circuit 204a outputs the cutting feed speed abnormally low signal 330 when the rotation speed of the bit feed motor 16 is abnormally lowered, the circuit may be used.

Further, in the fourth control means 3D, the abnormal cutting speed signal 330 detected by the abnormal cutting speed detecting means 270 is detected as follows. That is, the cutting feed speed classification circuit 204a
When the bit feed speed detector 34 for detecting the feed speed of the cutting machine detects that the cutting speed is abnormally low, the cutting feed speed abnormally low signal 330 is output, and this may be used.

By controlling in this way, the cutting edge of the core bit 13 can be pulled back just before the cutting edge bites into the workpiece during cutting, and re-cutting can be continued. If re-cutting is not possible due to wear or the like, the emergency stop can be performed without overloading the bit feed motor 16 and without performing unreasonable cutting.

[Operation of Fifth Control Unit 3E] The cooling water supply means 24 can supply cooling water to the core bit 13. Further, a control valve 25 is provided in a passage of the cooling water supply means 24. In the fifth control unit 3E, when the start switch 40 is depressed to start the operation, the control valve 25 is opened, and after the cutting is completed, the control valve 25 is closed.

Here, when the start switch 40 is depressed, a start signal 306 is given to the operation state judgment circuit 206. In the operation state determination circuit 206, the valve opening / closing signal 331
To the control valve 25, whereby the control valve 25 is opened. When the cutting completion signal is input, the control valve 2
Close 5.

Here, in the fifth control section 3E, a target point reaching signal 360 from the target point reaching detecting means 260 may be used as the cutting completion signal.

[Operation of Modification of Fifth Control Unit 3E]
A control valve 25 is provided in a passage of the cooling water supply means 24. In another embodiment of the fifth control unit 3E, the start switch 4
When 0 is pressed and the operation starts, the control valve 25 is opened,
When the cooling water amount decrease signal 333 is input from the cooling water amount detector 31, the control valve 25 is controlled to be closed, and the device is stopped.

Further, as another embodiment of the cooling water amount detector 31, when the start switch 40 is depressed and started,
When the control valve 25 is opened and the cooling water amount decrease signal 333 from the cooling water amount detector 31 is input, the control valve 31
Is controlled, and the bit feed motor 16 is controlled.
Is reversed to return to the original position. At this time, when the start switch 40 is pressed, a start signal 306 is generated.
Is supplied to the operation state determination circuit 206, and the operation state determination circuit 206 opens the control valve 25. The signal 323 from the bit feed motor forward / reverse rotation determination circuit 212, the stop signal 307 from the stop switch 41, the cooling water amount detector 3
The cooling water amount decrease signal 333 from the operation state determination circuit 2
When taken into 06, the control to close the control valve 31 and the control to reverse the bit feed motor 16 to return to the original position are performed.

By executing such control, cooling water is supplied at the start of cutting, and when the operation is completed and when the amount of cooling water is low, an operator's judgment, operation, and monitoring of the amount of cooling water during operation are performed. In addition, it is possible to automatically perform the supply and stop of the cooling water and the processing at the time of abnormality.

The operating state determination circuit 206 includes a cutting start indicator light 401, a cutting stop indicator light 402, a cutting completion indicator light 403, and an overcurrent indicator light 40 of the bit rotation motor 11.
5, a predetermined display is performed by using the feed speed abnormal decrease indicator light 406 and the cooling water amount decrease indicator lamp 408, and a predetermined acoustic report is performed by using the cutting completion acoustic alarm 404 and the abnormal state acoustic alarm 407. Has become.

[0074]

According to the present invention, after the control valve is automatically opened at the time of starting, when the core bit reaches the target point, the control valve is closed and the apparatus is stopped, and the amount of cooling water from the cooling water amount detecting means is detected. When the lowering signal is input, the second motor is controlled to reverse and return to the original position, so that the labor of the operator can be reduced, and the temperature of the cutting edge of the core bit when there is no cooling water is reduced. As a result, the reliability of the device can be improved.

According to the present invention, after the control valve is automatically opened at the time of starting, when the core bit reaches a target point, the control valve is closed and the apparatus is stopped, and the cooling water flow from the cooling water flow detecting means is reduced. When a signal is input, the second motor is controlled to reverse and return to the original position, and an alarm is issued, so that the labor of the operator can be reduced, and when there is no cooling water, the core bit can be removed. The temperature of the cutting edge can be prevented from rising, and an alarm is issued when there is an abnormality in the cooling water, so that it is possible to take measures against the abnormality and increase the reliability of the device.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a control device for a drilling machine according to the present invention.

FIG. 2 is a front view showing an operation panel of the embodiment.

FIG. 3 is a block diagram showing the embodiment.

FIG. 4 is an overall configuration diagram of a sequence for explaining an operation of the embodiment.

FIG. 5 is a sequence configuration diagram of a block B100 part of FIG. 4;

FIG. 6 is a sequence configuration diagram of a block B200 part of FIG. 4;

FIG. 7 is a sequence configuration diagram of a block B300 part in FIG. 4;

FIG. 8 is a sequence configuration diagram of a block B400 part of FIG. 4;

FIG. 9 is a characteristic diagram showing a relationship between torque and load current of the AC commutator motor.

FIG. 10 is a characteristic diagram showing a relationship between load current and rotation speed of the AC commutator motor.

FIG. 11 is a characteristic diagram showing a relationship between the rotation speed of the core bit and the peripheral speed of the cutting edge of the core bit.

FIG. 12 is a characteristic diagram showing a relationship between a core bit peripheral speed and a cutting feed speed when the driving torque is fixed.

FIG. 13 is a time chart showing a relationship between a load current and a feed speed of the first electric motor during the cutting operation.

FIG. 14 is an attached flowchart for explaining the operation of the conventional device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 drilling machine 3 control device 11 bit rotation motor (first motor) 13 core bit 14 rotation drive transmission unit 15 feed mechanism 16 bit feed motor 18 feed drive transmission unit 30 operation panel 31 cooling water amount detection means 32 input voltage detector 33 Rotation speed detector 34 Bit feed speed detector 35 Bit size selector 36 Load current detector 37 Bit moving distance detector 38 Cutting distance setting device 39 Bit origin position detector 40 Start switch 3A, 3B, 3C, 3D, 3E Control means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomomasa Ushigami 5-3 Takara-cho, Kure-shi, Hiroshima Prefecture Inside Bab Hitachi Industries, Ltd. (72) Inventor Takao Abe 5-3 Takara-cho, Kure-shi, Hiroshima Prefecture Bab Hitachi Industrial Co., Ltd. In-company (72) Inventor Kimio Yaegashi 396-Ashidaka, Numazu-shi, Shizuoka 59 Inside Ishihara Kikai Kogyo Co., Ltd. (56) References JP-A 1-275009 (JP, A) JP-A 62-199313 (JP, A) JP-A 4-38310 (JP, U)

Claims (5)

(57) [Claims] 1. A rotary drive transmitting unit including a first motor and rotating a core bit, a feed mechanism for moving the core bit forward and backward, and a feed drive transmitting unit including a second motor and driving the feed mechanism. A control device for controlling the operation of the drilling machine, comprising: a cooling water supply unit for supplying cooling water to a core bit; a control valve provided in a passage of the cooling water supply unit; and a cooling water amount provided in a passage of the cooling water supply unit. Detecting means for opening the control valve at start-up, closing the control valve and stopping the device when the core bit reaches the target point and a target point reaching signal is input, or cooling from the cooling water amount detecting means. Control means for closing the control valve when a water amount reduction signal is input and for reversing the second electric motor to return to the original position. Location. 2. A rotary drive transmitting unit including a first motor and rotating a core bit, a feed mechanism for moving the core bit forward and backward, and a feed drive transmitting unit including a second motor and driving the feed mechanism. A control device for controlling the operation of the drilling machine, comprising: a cooling water supply unit for supplying cooling water to a core bit; a control valve provided in a passage of the cooling water supply unit; and a cooling water amount provided in a passage of the cooling water supply unit. Detecting means for opening the control valve at start-up, closing the control valve and stopping the device when a core bit reaches a target point and a target point arrival signal is input, or cooling from the cooling water amount detecting means. Control means for closing the control valve when the water amount decrease signal is input and for reversing the second electric motor to return to the original position; and for controlling the cooling water amount from the cooling water amount detecting means. Controller of the drilling machine, characterized in that a abnormal state informing means for issuing an alarm based on signals. 3. The control device for a drilling machine according to claim 1, wherein the target point reaching signal is obtained by a target point reaching detecting means. 4. The control device for a drilling machine according to claim 1, wherein said abnormal condition notifying means is constituted by a cooling water amount decrease indicator lamp. 5. The control device for a drilling machine according to claim 1, wherein said abnormal state notifying means is constituted by an abnormal state sound alarm.