JPH0327908A - Control device for core drill - Google Patents

Abstract

PURPOSE:To increase cutting efficiency and extend the life of a blade of a core bit by selecting the dimension of core bit, setting the cutting target current of a first motor, comparing load current and the cutting target current value of the first motor and controlling the rotation of a second motor in a manner that the load current of the first motor is equivalent to the cutting target current value. CONSTITUTION:The dimension of a core bit is selected through a selector. Then, the cutting target current value of a first motor 11 corresponding to the dimension and the hardness of a material to be cut is set by a current setting instrument based on a selection signal from the selector. Then, the load current and electric cutting target current value of the first motor 11 sensed out by a current sensor are compared with by a control means, and the rotation of a second motor 16 of a feeding drive transmitting section is controlled by the control means in a manner that the load current is equivalent to the cutting target current value. Optimum cutting efficiency and the long life of a blade of the core bit can be secured even in case the dimension of the core bit and the hardness of the material to be cut are different by said arrangement.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a drilling machine capable of cutting and drilling objects such as reinforced concrete, concrete, rock, asphalt, etc. This invention relates to a control device that can maintain optimal conditions according to the conditions. [Prior Art] This type of conventional drilling machine is known as a device for cutting and drilling objects such as reinforced concrete, concrete, rock, and asphalt. Such a drilling machine is equipped with a rotational drive transmission unit that rotates a core bit, a feeding mechanism that moves the core bit forward and backward, a feeding drive transmission unit that drives the feeding mechanism, a column that supports these, and each of the above-mentioned members. The machine is equipped with a stand that is used to secure the machine to the workpiece. Further, the drilling machine is connected to a control device by a connecting cable, and the cutting and drilling operations of the drilling machine are automatically controlled by the control device. This control device has an operation panel and an electronic control circuit inside, and this electronic control circuit is configured in advance so as to realize the operation procedure shown in FIG. Accordingly, electronic control circuits operate to realize various control operations. In addition, in wet drilling machines, in order to cool the core bit, cooling water is guided to the core bit, and the supply/stop of the cooling water is regulated by a cooling water supply valve. Here, the rotational drive transmission section includes an electric motor and a reduction gear. The feeding mechanism can be configured by a combination of a rack and pinion. The feed drive transmission section includes an electric motor and a reduction gear.

The cutting and drilling operations of the above-described drilling machine are controlled by the control device as follows. FIG. 10 is a flowchart showing the operating procedure of a drilling machine using a conventional control device. First, when the start switch provided in the control device is turned on (step lOO), the control device rotates the electric motor of the rotational drive transmission section (step 101), and at the same time rotates the electric motor of the feed drive transmission section (step 102). , Next, the current value to be supplied to the electric motor of the rotational drive transmission section is set in the setting device provided on the front of the control device (step 1o).
3).

As a result, the core bit rotates via the reduction gear of the rotational drive transmission section, and the feed mechanism is driven via the reduction gear of the feed drive transmission section, thereby drilling into the workpiece.

At this time, the control device detects the current flowing into the electric motor of the rotational drive transmission unit, and compares the current value flowing into the electric motor with the reference setting value (for example, the rated current value of the electric motor) set in the setting device. A comparison is made (step 104), and when the motor current is smaller than the reference setting value, a current is applied so as to increase the rotation of the motor of the feed drive transmission section (step 105);
When the motor current is greater than the reference setting value, current is applied to reduce the rotation of the motor in the feed drive transmission section (step 106).In this way, when the cutting feed rate of the core bit is increased or decreased, the cutting resistance increases or decreases. As a result, the current value of the rotational drive transmission section increases or decreases, but by performing the above current control, the drilling operation can be performed while always maintaining the load current of the motor of the rotational drive transmission section near the rated current value. Can be done. Further, since the electric motor of the rotational drive transmission section generally uses a commutator motor, its load current increases and decreases in the same manner as the torque increases and decreases. Therefore, even if the cutting resistance is increased or decreased by increasing or decreasing the cutting feed rate of the core bit, the control device uses the above characteristics to control the current of the electric motor of the rotational drive transmission section so that the torque is around the rated current value. can do.

Next, the control device determines whether the current flowing into the electric motor of the rotational drive transmission section is overloaded (step 107), and if normal, further determines whether the current value of the electric motor of the rotational drive transmission section is extremely low. (Step 10B) If the temperature is not extremely low, it is assumed that the cutting operation is in progress and the process returns to Step 104. That is, the control device repeatedly executes the operations of steps 104 to 10B during the cutting/drilling operation.

Further, if the control device determines in step 10B that the current of the electric motor of the rotational drive transmission section is an extremely low value, it assumes that the cutting operation has been completed and stops the electric motor of the rotational drive transmission section (step 109), At the same time, the electric motor of the feed drive transmission section is stopped (step 110). On the other hand, if the control device determines that the load current of the electric motor of the rotational drive transmission section has increased to an overload in step 107 during cutting,
An alarm buzzer is sounded and an abnormality indicator light is turned on to notify the abnormality (step 111), and at the same time, the electric motor of the rotational drive transmission section is stopped (step l09), and at the same time, the electric motor of the feed drive transmission section is stopped ( Step 110
), In addition, with wet drilling machines, the worker opens the cooling water supply valve to supply cooling water before starting cutting, and after the cutting is completed, the worker closes the cooling water supply valve to stop the supply of cooling water. There is. Such conventional drilling machines do not provide monitoring or protection in case of an abnormal drop in cooling water.

Related devices of this type include ``R Diamond Core Drill Fully Automatic Device 1 listed in the catalog published by Hakken Co., Ltd.''. [Problems to be Solved by the Invention] The conventional drilling machine control device described above has the following problems.

■There is an appropriate range for the peripheral speed of the blade at the tip of the core bit in terms of cutting efficiency and blade life. This peripheral speed varies depending on the blade structure, material, hardness of the workpiece, etc. Here, with core bits made of the same structure and material,
If there are blades with different dimensions, in this case the appropriate range of blade peripheral speed will be approximately the same regardless of the dimensions. However, the conventional drilling machine control device only controls the current flowing into the electric motor of the rotational drive transmission part to a constant value, and since the electric motor is a commutator motor,
Depending on the core bit with different dimensions, the appropriate peripheral speed could not be achieved, which caused problems in terms of cutting efficiency and the lifespan of the cutting edge. - During the extremely low load period from startup to the start of cutting, the load current of the electric motor in the rotational drive transmission section is low, and the rotational speed of the electric motor in the feed drive transmission section increases. As a result,
Since the feed rate of the core bit increases, an impact is applied to the drilling machine body at the moment the cutting edge of the core bit hits the object to be cut, and the cutting edge of the core bit is likely to be damaged. In addition, as the rotational speed of the electric motor in the rotational drive transmission unit increases, run-out occurs on the cutting edge of the core bit, which tends to cause the cutting position to shift at the start of cutting, resulting in poor cutting and drilling accuracy. ■Also, in the case of the control device for the drilling machine mentioned above, each electric motor is simply stopped after cutting is completed or in the event of an abnormality, so the operator must return the core bit to the position before drilling after the core bit has stopped rotating. there were.

■If an abnormality occurs during cutting, such as the cutting edge getting stuck in the workpiece, the motor will be overloaded, or the operator will temporarily stop it, and then pull back the core bit or start it again to continue cutting. It was necessary to judge and operate whether to do so.

■In the case of a wet type drilling machine, the operator had to open a valve to start supplying cooling water to the drilling machine before starting the machine, and then close the valve to stop the supply after cutting was completed. Furthermore, if the amount of cooling water decreases during cutting, if the operator does not notice this, the temperature of the cutting edge of the core bit will rise, damaging it and making it impossible to continue cutting.

The purpose of the present invention is to solve the above-mentioned problems of the conventional device, improve cutting efficiency, extend the life of the cutting edge of the core bit, protect it from impact, improve cutting accuracy, and improve cutting efficiency. An object of the present invention is to provide a control device for a drilling machine that reduces labor.

[Means to solve the problem]

The purpose of improving the cutting efficiency and extending the life of the cutting edge of the core bit is to include a rotational drive transmission section that includes a first electric motor and rotates the core bit, a feed mechanism that advances and retreats the core bit, and a second electric motor. A control device for controlling the operation of a drilling machine including a feed drive transmission unit for driving the feed mechanism, wherein the control means includes a selector for selecting a core focus size, and a selector for selecting a core focus size according to a selection signal from the selector. A current value setting means for setting a cutting target current value of the first motor and a current detecting means for detecting the load current of the first motor are compared with the cutting target current value from the current value setting means. This is achieved by comprising a control means for controlling the rotation of the second electric motor of the feed drive transmission section so that the load current of the first electric motor reaches the cutting target current value. In addition, the purpose of improving the cutting efficiency and extending the life of the cutting edge of the core bit is to provide a rotational drive transmission section that includes a first electric motor and rotates the core bit, a feed mechanism that advances and retreats the core bit, and a second electric motor that rotates the core bit. and a feed drive transmission unit that drives the feed mechanism, the control device for controlling the operation of a drilling machine comprising: a feed speed detection means for detecting a speed at which a core bit is fed by the feed mechanism; and a feed speed detection means current value setting means for setting a cutting target current value of the first motor according to a detection signal from the load current detected by the current detection means for detecting the load current of the first motor and cutting from the current value setting means; and a control means for controlling the rotation of the second motor of the feed drive transmission unit so that the load current of the first motor becomes the cutting target current value by comparing the current value with a target current value,
achieved.

Next, for the purpose of protecting against the above-mentioned impact and improving cutting accuracy, a rotational drive transmission section that includes a first electric motor and rotates the core pin, a feed mechanism that advances and retreats the core bit, and a second electric motor are provided. and a feed drive transmission unit that drives the feed mechanism, wherein the control device is configured to set the rotational speeds of the first electric motor and the second electric motor to a constant low value at the time of starting. This is achieved by providing a start control section that limits the rotation speed and releases the restriction to achieve the desired rotational state in response to a release signal from a predetermined condition establishing means. Here, the condition establishing means may be configured to output a release signal when the detection signal from the current detection means for detecting the load current of the first motor exceeds a preset value. Further, the condition enforcement means may be constituted by a timer that measures time at the time of startup and outputs a release signal after a set time limit has elapsed. Further, the condition establishing means may be configured to output a release signal when the core focus reaches a position moved a predetermined distance after the core focus is started.

The purpose of reducing the labor of the worker is to provide a rotational drive transmission section that includes a first electric motor and rotates the core bit, a feed mechanism that advances and retreats the core bit, and a feed mechanism that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of a drilling machine comprising a drive transmission unit, wherein the control device is combined with a home position detection means for detecting the home position of the core bit before starting, and a home position detection means for detecting that the core bit has reached a target point. The second electric motor is reversed by the target point arrival detection means and the target point arrival signal from the target point arrival detection means, and when the original position detection means detects that the core bit has returned to the original position, the first electric motor and This is achieved by comprising a control means for stopping the second electric motor. The target point arrival detecting means includes a moving distance detecting means for detecting a moving distance of the core bit, a cutting moving distance setting means for setting a cutting moving distance, and a moving distance detecting means for detecting a moving distance from the moving distance detecting means to a set distance of the cutting moving distance setting means after starting. and a determining means that determines that the core bit has reached the target point based on the detection signal of and outputs a target point arrival signal. The target point arrival detection means may be configured to output a target point arrival signal when a detection signal from a current detection means for detecting the load current of the first electric motor becomes lower than a preset value.

The purpose of reducing the labor of the worker is to provide a rotary drive transmission unit that includes a first electric motor and rotates the core bit, a feed mechanism that advances and retreats the core bit, and a second electric motor that drives the feed mechanism. In a control device for controlling the operation of a drilling machine, the control device includes a cutting speed abnormality detection means for detecting an abnormal decrease in cutting speed; By comprising a forward/reverse rotation means that reverses the second electric motor in response to an abnormal speed reduction signal and rotates the second electric motor forward after a certain period of time, and a repeating means that repeats the operation of the forward/reverse rotation means a certain number of times. , will be accomplished.

The cutting speed abnormality detection means may be configured to output an abnormal cutting speed reduction signal when the input voltage of the second electric motor has abnormally decreased. Further, the cutting speed abnormality detection means may be configured to output an abnormal cutting speed reduction signal when the rotational speed of the second electric shift machine has abnormally decreased. Furthermore, the cutting speed abnormality detection means may be configured to output an abnormal cutting speed reduction signal when the feed speed of the feed mechanism has abnormally decreased. The purpose of reducing the labor of the worker is to provide a rotational drive transmission section that includes a first electric motor and rotates the core bit, a feed mechanism that advances and retreats the core bit, and a feed mechanism that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of a drilling machine having a drive transmission unit, which includes a cooling water supply means for supplying cooling water to the core bit, a control valve in a passage of the cooling water supply means, and This can be accomplished by configuring the device to have a circuit configuration that opens the control valve at the time of startup and closes the control valve after cutting is completed.

The control device is configured to complete cutting in response to a target point arrival signal from a target point arrival detection means that detects that the core bit has reached the target point. The purpose of reducing the labor of the worker is to provide a rotational drive transmission section that includes a first electric motor and rotates the core bit, a feed mechanism that advances and retreats the core bit, and a feed mechanism that includes a second electric motor and drives the feed mechanism. In a control device for controlling the operation of a drilling machine having a drive transmission unit, a cooling water supply means for supplying cooling water to the core bit is provided, and a control valve and a cooling water amount detection means are provided in a passage of the cooling water supply means. and configuring the control device as a circuit that opens the control valve at startup and closes the control valve when a cooling water amount reduction signal from the cooling water amount detection means is input, and also stops the device. This is achieved by

The purpose of reducing the labor of the worker is to provide a rotational drive transmission section that includes a first electric motor and rotates the core bit, a feed mechanism that advances and retreats the core bit, and a feed mechanism that includes a second electric motor and drives the feed mechanism. In a control device for controlling the operation of a drilling machine having a drive transmission unit, a cooling water supply means for supplying cooling water to the core bit is provided, and a control valve and a cooling water amount detection means are provided in a passage of the cooling water supply means. , and the control device is controlled to open the control valve at the time of startup and close the control valve when a cooling water amount decrease signal from the cooling water amount detection means is input manually, and to reverse the second electric motor. This can be accomplished by creating a circuit configuration that controls the return to the original position.

[Effect]

First, select the dimensions of the core bit using the selector. Thereby, the current value setting means sets a cutting target current value for the first motor according to the dimensions and the hardness of the object to be cut, based on the selection signal from the selector. Then, the control means compares the detected load current from the current detection means for detecting the load current of the first motor with the cutting target current value from the current value setting means, and the control means determines whether the load current is the cutting target or not. The rotation of the second electric motor of the feed drive transmission section is controlled so that the current value is maintained. This ensures consistent cutting efficiency and core bit edge life even when the dimensions of the core bit and the hardness of the workpiece differ.

Further, the control device operates as follows. The feed rate detection means detects the rate at which the core bits are sent. The current value setting means sets a cutting target current value of the first electric motor according to the detection signal from the feed rate detection means. The load current detected by the current detection means for detecting the load current of the first electric motor is compared with the cutting target current value from the current value setting means by the control means. The control means controls the rotation of the second electric motor of the feed drive transmission unit so that the load current reaches a cutting target current value. This ensures optimal cutting efficiency and core bit edge life even when the dimensions of the core bit and the hardness of the workpiece differ. The control device then operates as follows.

At the time of starting, the starting control section limits the rotational speeds of the first electric motor and the second electric motor to a constant low value.

As a result, since the feed speed is low and the rotational speed of the core bit is low, the impact when the core bit hits the workpiece can be reduced, and the cutting edge of the core bit and the drilling machine can be protected from the impact. In addition, as mentioned above, since the rotation of the core bit is small, the runout of the core bit's cutting edge is reduced, improving cutting accuracy. The starting control unit cancels the restriction in response to a cancellation signal from a predetermined condition establishing means and returns to the desired rotational state. This allows the feeding mechanism to reach its normal feeding speed and the core bit to rotate at its original rotational speed, allowing efficient cutting.

Here, the cancellation signal from the condition establishing means can be obtained when the detection signal from the current detecting means for detecting the load current of the first motor exceeds a preset value.

Further, the cancellation signal from the condition establishing means may be an output signal from a timer that starts measuring time at the time of startup and outputs a signal after a set time limit has elapsed. Further, the release signal from the condition establishing means may be a signal obtained when the core bit reaches a position after moving a predetermined distance after starting. Further, the control device operates as follows.

The second motor is started and the core bit is sent to the workpiece 9. Then, when the target point arrival detection means detects that the core bit has reached the target point, the second electric motor is reversed. This controls the return of the core bit to its original position. When the original position detection means detects that the core bit has returned to the original position, the control means stops the first electric motor and the second electric motor. Thereby, there is no need to return the core bit after cutting is completed, and the labor of the operator can be reduced.

Here, the target point arrival detection means includes a movement distance detection means for detecting the movement distance of the core bin, a cutting movement distance setting means for setting the cutting movement distance, and a setting distance of the post-start cutting movement distance setting means. It is sufficient to use a determination device that determines that the core bit has reached the target point based on a detection signal from the movement distance detection device and outputs a target point arrival signal. This eliminates the need to return the core bit after cutting is complete.

Further, the target point arrival detection means is configured to output a target point arrival signal when a detection signal from the current detection means for detecting the load current of the first electric motor exceeds a preset value. You may use it. According to this,
There is no need to set the cutting distance.

In addition, the control device reverses the second electric motor when the cutting speed abnormality detection means detects that the cutting speed has decreased abnormally, and reverses the second electric motor after a certain period of time using the forward/reverse rotation means. Rotate. The control device causes the repeating means to repeat the operation of the forward and reverse rotation means a predetermined number of times. As a result, it is possible to prevent cutting jamming, eliminate the need for judgment and operation by the operator when jamming occurs, and detect that an abnormality has occurred when repeated operations are performed a certain number of times or more using the repeating means. be able to.

Here, the cutting speed abnormality detection means may be configured to output an abnormal cutting speed reduction signal when the input voltage of the second electric motor has abnormally decreased. Further, the cutting speed abnormality detection means may be configured to output an abnormal cutting speed reduction signal when the rotational speed of the second electric motor has abnormally decreased. Further, the cutting speed abnormality detection means may be configured to output an abnormal cutting speed reduction signal when the feed speed of the feed mechanism has abnormally decreased. Further, a cooling water supply means for supplying cooling water to the core bit is provided, and a control valve is provided in a passage of the cooling water supply means. Further, the control device opens the control valve at the time of starting, and closes the control valve after cutting is completed. This allows the operator to automatically supply cooling water.

Further, a cooling water supply means for supplying cooling water to the core bit is provided, and a control valve and a cooling water amount detection means are provided in a passage of the cooling water supply means.

The control device opens the control valve at the time of startup, and controls the control valve to close when a cooling water amount reduction signal from the cooling water amount detection means is input, and also stops the apparatus. This prevents the cutting edge of the core bit from being damaged due to a lack of cooling water, and there is no need to constantly monitor the state of cooling water supplied to the cutting edge of the core bit.

In addition, a cooling water supply means for supplying cooling water to the core bit is provided, and a control valve and a cooling water amount detection means are provided in the passage of the cooling water supply means. The control device opens the control valve at the time of startup, closes the control valve when a cooling water amount decrease signal from the cooling water amount detection means is input, and reverses the second electric motor to start the engine. return to position. This eliminates the need for the operator to pull out the core bit in the event of an abnormality due to a lack of cooling water.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

1 to 9 are for explaining one embodiment of the present invention. Here, FIG. 1 is a perspective view showing an embodiment of a control device for a drilling machine of the present invention, FIG. 2 is a front view showing an operation panel of the same embodiment, and FIG. 3 is a block diagram showing the same embodiment. Fig. 4 is a sequence diagram for explaining the operation of the same embodiment, Fig. 5 is a characteristic diagram showing the relationship between the torque and load current of the AC commutator motor, and Fig. 6 is the load current and rotation of the AC commutator motor. Figure 7 is a characteristic diagram showing the relationship between core bit rotation speed and core bit cutting edge peripheral speed. Figure 8 is a characteristic diagram showing the relationship between core bit peripheral speed and cutting feed rate when the driving torque is fixed. Characteristic diagram, Figure 9 shows the load current of the first motor during cutting operation,
This is a time chart showing the relationship with feed speed. 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 has an electric fill for bit rotation and a speed reducer 1.
2 and rotates the core bit 13.
4, a feed mechanism l5 for advancing and retracting the core bin} 13, a feed drive transmission section 18 that includes a bit feed electric motor 16 and a speed reducer 17 and drives the feed mechanism 15, a support column 19 that supports these, and each of the above-mentioned The mount 20 is used for mounting a member and fixing it to a workpiece. Note that the pedestal 20 is fixed to the workpiece by anchor bolts 21. Further, a manual feed handle 22 is provided on the side 15 of the feeder. Further, the core bit 13 is connected to the output shaft of the reducer l2 via a tube 23. Cooling water is supplied to the core bit 13 via a cooling water supply hose 24 serving as a cooling water supply means. A control valve 25 and a cooling water amount detector 31 are provided in the passage of this cooling water supply means.
The control device 3 has an operation panel 30 shown in FIG. 2, and has an electronic control means shown in FIG. 3 inside,
Moreover, by controlling this electronic control means in advance so that the operating procedure shown in FIG. 4 can be realized, the operation panel 3
The electronic control means operates in accordance with the operation of 0, etc., and realizes various control operations. This control device 3 is mainly composed of a microcomputer and other electronic circuits, and includes a cooling water amount detector 3l and a manual voltage detector 32 of a bit feeding electric motor 16.
, a rotation speed detector 33 of the bit feeding electric motor 16,
A bit feed rate detector 34, a bit size selector 35, a load current detector 36 for the bit rotation electric motor 11, a binot moving distance detector 37, a cutting distance setter 38, a bit origin position detector 39, , the detection signals from the start switch 40 and the stop switch 4l are taken in, and the control sequence shown in FIG. 4 is realized. Note that the cooling water amount detector 31, rotational speed detector 33, bit feed rate detector 34, bit movement distance detector 37, and bit origin position detector 39 are respectively arranged at predetermined locations. , other detectors (32, 36) are provided in the control device 3, and operation switches (35.3B, 40.41) are provided in the operation panel 30. The operation panel 30 of the control device 3 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 rotation switch for the bit feed motor l6, and 50 is a distance setting switch. Suinochi, 5l is the setting distance reset switch, 52 is the error display reset switch, 53 is the electric motor for bit rotation.
1 is an abnormality indicator, 54 is a cutting failure indicator, 55 is a cutting completion indicator, and 56 is a load current meter for the bit rotation motor 11. Next, as shown in FIG. 3, the control device 3 includes a first control stage 3A, a second control means 3B, and a third control means 3C.
, a fourth control stage 3D, and a fifth control section 3E. The configuration of each of the first control stages 3A to the fifth control section 3E will be explained with reference to FIG. 4. The first control stage 3A includes a current value setting means 201 that sets a cutting target current value 302 for the first motor in accordance with a selection signal 301 from a bit size selector 35 that selects the dimensions of the core bit; A comparison in which a load current 303 detected by a load current detector 36 that detects the load current of a certain bit rotation electric motor 11 is compared with a cutting target current value 302 from the current value setting means 201 to form a deviation signal 304. circuit 202 and a deviation signal 304 from the comparison circuit 202
A bit feed motor control circuit 20 outputs a control signal 305 that controls the bit feed motor l6 so that the bit feed motor l6 becomes zero.
It is composed of 3. A modification of the first control means 3A includes a feed speed detection means 204 that detects the speed at which the core bit 13 is fed by the feed mechanism l5, and a bit rotation according to the hardness judgment signal 312 from the feed speed detection stage 204. The current value setting means 201 sets the cutting target current value 302 of the electric motor 11, and the load current detected by the load current detector 36 detects the load current of the bit rotation electric motor l1 and the cutting current value from the current value setting means 20l. Target current value 30
Comparison circuit 20 which compares with 2 and forms a deviation signal 304.
2, and a bit feed motor control circuit 203 that outputs a control signal 305 for controlling the rotation of the bit feed motor 16 so that the deviation signal 304 from the comparison circuit 202 becomes zero. Here, in the modification of the first control means 3A, the feed speed detection means 204 receives the input voltage value signal 308 from the input voltage detector 32 and the rotation speed signal 30 from the rotation speed detector 33.
9. Feed rate signal 3l from bit feed rate detector 34
A cutting feed rate division circuit 204a that takes in either one of O and forms a cutting feed rate value signal 311; It consists of a hardness judgment circuit 204b. The second control means 3B includes an operating state determining circuit 206 that outputs a soft starting signal 316 when the starting switch 40 is pressed and a starting signal 306 is input;
A rotational speed low limit signal 319.3 for limiting the rotational speed of the bit rotation motor 1l and the bit feeding motor 16 to a constant low value by a soft start signal 316 from the
20 and send these respectively to the motor control circuit 2.
03. A release signal 350 is given to the bit rotation motor control circuit 207 and is also sent from the predetermined condition establishing means 250.
The soft start control circuit 209 serves as a start control section that releases the above-mentioned restriction and brings the rotation state to the desired state.

Here, in the second control means 3B, the condition establishing means 250 generates a release signal 31B when the detection signal from the load current detector 36 that detects the load current of the bit rotation electric motor 1l exceeds a preset value. The bit rotation motor current determination circuit 208 may be configured to output the bit rotation motor current determination circuit 208.

Further, in the second control means 3B, the condition establishing means 2
Reference numeral 50 may include a soft start release timer 211 that measures the time using the soft start signal 316 at the time of startup and outputs the release signal 317 after a set time limit has elapsed. Further, in the second control means 3B, the condition establishing means 250 includes a bit movement distance detector 37 for detecting the movement distance of the core bit l3, a cutting distance setting device 38 for setting the cutting movement distance, and a cutting distance after starting. A cutting determination circuit that determines that the core bit 13 has reached the target cutting point based on the distance setting signal 313 from the setting device 38 and the movement distance signal 314 from the bit movement distance detector 37 and outputs a soft start cancellation signal 315. 210. The second control means 3C includes a bit origin position detector 39 that detects the original position of the core bit l3 before starting, and a target point reaching signal 360 that detects that the core bit l3 has reached the target point and outputs a target point arrival signal 360. outputting a control signal 328 for reversing the bit feeding electric motor 16 based on the detection means 260 and the target point arrival signal 360 from the target point arrival detection means 260;
and a start/stop operation signal 327 that stops the bit rotation electric motor 11 when the bit origin-position detector 39 detects that the core bit 13 has returned to its original position;
The operating state determination circuit 206 outputs a control signal 328 to stop the bit feeding motor l6. 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, a cutting distance setting device 38 for setting the cutting movement distance, and a cutting distance setting device 38 for setting the cutting movement distance. The cutting distance setter determines that the core bit l3 has reached the target cutting point based on the distance setting signal 313 on the third day and the moving distance signal 314 from the bit moving distance detector 37, and outputs a target point arrival signal (distance match signal). ) 322.

Further, in the third control means 3C, the target point attainment detection means 260 detects that the load current value signal 303, which is a detection signal from the load current detector 36 that detects the load current of the bit rotation electric motor 11, has a preset value. The bit rotation motor current judgment circuit 20B may be configured to output a target point arrival signal (cutting hole penetration signal) 321 when the current exceeds the target point.

The fourth control means 3D includes a cutting speed abnormality detection stage 270 for detecting an abnormal decrease in the cutting speed, and a cutting feed speed abnormal decrease signal 3 from the cutting speed abnormality detection means 270.
forward/reverse rotation means 280 for reversing the bit feed motor l6 by 30 and forwardly rotating the second electric motor after a fixed time period; and a repetition count circuit as a repeating means for repeating the operation of the forward/reverse rotation means 280 for a fixed number of times. It consists of 214. Here, in the fourth control stage 3D, the cutting speed abnormality detection means 270 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 of the bit feeding electric motor 16. 204a.

Further, in the fourth control stage 3D, the cutting speed abnormality detection means 270 outputs a cutting feed speed abnormal decrease signal 3 due to an abnormal decrease in the rotational speed of the bit feeding electric motor 16.
It may also be configured with a cutting feed rate classification circuit 204a that outputs 30. Further, in the fourth control stage 3D, the cutting speed abnormality detecting means 270 detects that the cutting speed is abnormal when an abnormal decrease is detected by the bit feed speed detector 34 that detects the feed speed of the feed mechanism l5. It may also be configured with a cutting feed rate classification circuit 204a that outputs a reduction signal 330. The fifth control unit 3E includes a cooling water supply means 24 for supplying cooling water to the core bit l3, and a control valve 25 in the passage of the cooling water supply means 24, and opens the control valve 25 at the time of startup to complete cutting. The circuit configuration is such that the control valve 25 is closed later. To set this circuit horizontally, a bit feeding motor forward/reverse rotation judgment circuit 212, an operating state judgment circuit 206, a bit rotation motor control circuit 207, and a bit feeding motor control circuit 203 are used. ．． Here, in the fifth control section 3E, the completion of cutting may be performed using the target point arrival signal 360 from the target point arrival detecting means 260.

Further, as another embodiment of the fifth control section 3E, a cooling water supply means 24 for supplying cooling water to the core bit 13 is provided, and a control valve 25 is provided in the passage of the cooling water supply means 24.
and a cooling water amount detector 3l, and controls to open the control valve 25 at startup and close the control valve 31 when a cooling water amount reduction signal 333 from the cooling water amount detector 3l is input, and to control the operation of the device. It is also possible to configure the circuit to stop. To achieve this circuit configuration, the bit feeding motor must be
A reverse rotation determination circuit 212, an operating state determination circuit 206,
A bit rotation motor control circuit 207 and a bit feeding motor control circuit 203 are used. Furthermore, as another embodiment of the cooling water amount detector 31, a cooling water supply stage 24 for supplying cooling water to the core bit l3 is provided, and a control valve 25 and a cooling water amount detector are installed in the passage of the cooling water supply means 24. 3l is provided, and the control valve 25 is opened at startup, and when the cooling water amount decrease signal 333 from the cooling water amount detector 3l is input manually, the control valve 3l is controlled to be closed, and the bit feeding electric motor 16 is reversely rotated. A circuit structure may also be used to control the movement and return to the original position. To achieve this circuit configuration, the bit feeding motor must be
A reverse rotation determination circuit 212, an operating state determination circuit 206,
A bit rotation motor control circuit 207, a bit feeding motor control circuit 203, and a bit origin position detector 39 are used.

Note that the operating state determination circuit 206 uses the cutting start indicator light 40.
1. It is connected to the cutting stop indicator light 402, the cutting completion indicator light 403, the overcurrent indicator light 405 of the bit rotating electric motor 11, the feed speed abnormally low indicator light 406, and the cooling water amount low indicator light 40B to display a predetermined display. , a cutting completion acoustic alarm 404, and an abnormal state acoustic alarm 407 to issue a predetermined acoustic alarm. The operation of the embodiment configured in this way will be explained.

[Operation of the first control means 3A] First, the dimensions of the core bit 13 attached to the rotational drive transmission section 14 including the reducer l2 are set in the bit dimension selector 35. Then, press the start switch 40. This will cause the device to operate. Here, the soft start operation after pressing the start switch 40 will be described later, and the cutting operation will be explained first. Then, the bit size selector 35 outputs a selection signal 301 and inputs it to the current value setting means 201. Current value setting means 2
At 01, the current value to be passed through the electric motor 11 for one bit rotation is determined based on the selection signal 301, and the cutting target current value 30 is determined.
It is output as 2. This 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. As a result, the rotation of the bit feeding electric motor 16 is controlled so that the rotation of the bit feeding electric motor 16 is increased or decreased. Therefore, by performing such control, when the operator presses the start switch 40, the load current of the bit rotation electric motor 11 matches the cutting target current value 302 set according to the dimensions of the core bit 13 used. The feed rate of the core bit 13 is adjusted so that. Controlling as described above is possible due to the following reasons:
The effectiveness of this method can be confirmed in Figure 8, which shows the relationship between the circumferential speed of the cutting edge of the core bit and the cutting feed rate when the torque is kept constant. In Figure 8, the torque is fixed at 1.65 (kg-m), α is the relationship at the concrete part (1), and β is the relationship at the concrete part (2).
, T is the relationship at the reinforcing bar part (1), and δ is the relation at the reinforcing bar part (2
) shows the relationships in each case. As can be seen from the figure, the optimal circumferential speed of the cutting edge of the core bit l3 is approximately 180 to 190 [m/min].
Generally, as shown in FIG. 7, core bit 1
There is an appropriate range regardless of the size of 3. Moreover, a commutator motor is generally used as the bit rotation motor 11, and the load current (I) of the bit rotation motor 11 is
is a relationship that increases as the rotational speed (N) decreases.
Therefore, as shown in FIG. 7, the rotation speed of the core bit 13 can be determined according to the dimensions of the core bit l3, so from the relationship shown in FIG.
Cutting target current value of 1l of electric motor for bit rotation according to 30
2 can be obtained, and as shown in FIG.
) is proportional to the torque (T), so the rotation of the bit feeding motor 16 is controlled so that the current flowing through the bit rotating motor 11 matches this. therefore,
The core bit 13 rotates at a circumferential speed that corresponds to the dimensions of the core bit 13. Then, as shown in Figure 9, the concrete and reinforcing bars will be cut accordingly. (Operation of a modified example of the 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 speed signal 310 from the bit feed speed detector 34 is supplied to the cutting feedrate classification circuit 204a. The cutting feed rate classification circuit 204a supplies a cutting feed rate value signal 311 divided into several speed ranges to the workpiece hardness determination circuit 204b. Workpiece hardness judgment circuit 2
In step 04b, depending on the range of the cutting feed speed, for example, the slower the speed, the harder it is, and a hardness judgment signal is sent to increase the rotation of the bit rotation electric motor 11 in order to increase the cutting force accordingly. Outputs 312. The hardness judgment signal 312 of No. 4 is input to the current value setting means 201. The current value setting means 201 sets a cutting target current value 302 according to the hardness judgment signal 312 and sends it 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, generates a deviation signal 304, and supplies the deviation signal 304 to the bit feed motor control circuit 203. As a result, the rotation of the bit feeding electric motor 16 is controlled so that the rotation of the bit feeding electric motor 16 is increased or decreased. Therefore, by performing such control, when the operator presses the start switch 40, the load current of the bit rotation electric motor all matches the cutting target current value 302 set according to the dimensions of the core bit 13 used. As in, core bit 1
3 feed rate is adjusted.

Note that controlling as described above is effective for the same reasons as mentioned above. [Operation of second control means 3B] When the start switch 40 is pressed and the start signal 306 is input to the operating state determination circuit 206, a soft start signal 316 is output. This soft start signal 316 is given to the soft start control circuit 209.

In the soft start control circuit 209, the bit rotation electric motor 1
Rotational speed low limit signals 319, 32 for limiting the rotational speed of l and bit feed motor 16 to a certain low value
0 and sends these signals 319 and 320, respectively, to the motor control circuit 2o3. Bit rotation motor control circuit 2
Give to 07. As a result, the feed speed of the core bit 13 becomes slower, and the peripheral speed of the cutting edge of the core bit l3 becomes slower. Next, a release signal 350 from the condition establishing means 250 that detects 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 cancels the restriction and stops outputting the rotational speed low limit signals 319 and 320, so that the bit rotation electric motor 1l and the bit feeding electric motor 16 are brought into the desired rotational state. Here, in the second control means 3B, the condition establishing means 250 forms the cancellation signal 350 as follows. Load current value signal 3 from load current detector 36
03 is supplied to the bit rotation motor current determination circuit 208. The bit rotation motor current determination circuit 208 outputs a release signal 318 when the load current value signal 303 exceeds a preset value. This release signal 318
becomes the release signal 350 and the soft start control circuit 209
is input.

Further, in the second control means 3B, the condition establishing means 2
50 forms the release signal 350 as follows. A soft start release timer 211 that uses the time as a factor in a soft start signal 316 at the time of startup supplies a release signal 317 output after a set time limit has elapsed to the soft start control circuit 20'9 as a release signal 350. Further, in the second control means 3B, the condition establishing means 250 forms the cancellation signal 350 as follows.
A bit movement distance detector 37 detects the movement distance of the core bit l3 to obtain a movement distance signal 314. The cutting distance setting device 38 has a cutting movement distance set in advance.
The setting value is used as the distance setting signal 313 in the cutting judgment circuit 2.
It is supplied to 10. When the cutting determination circuit 210 determines that the core bit l3 has reached the target cutting point based on the distance setting signal 313 of the cutting distance setter 3 days after startup and the moving distance signal 3l4 from the bit moving distance detector 37, Outputs soft start cancel signal 315 to This soft start release signal 315 becomes a release signal 350 and is input to the soft start control circuit 209.

Since it operates in this way, when the operator turns on the start switch 40, the bit feed cutting speed and core bit 13
The rotational speed of the core bit 13 is limited to a low level, and the restriction is lifted when the cutting edge of the core bit 13 hits the object to be cut and cutting begins, so that the swinging of the cutting edge of the core bit 13 at the start of drilling is eliminated and the impact is reduced. You won't receive it anymore.

[Operation of third control means 3C] Movement distance signal 314 from bit movement distance detector 37
is given to the cutting judgment circuit 210. Cutting judgment circuit 2
10 is a distance setting signal 3 set by the cutting distance setting device 38
13, when the moving distance M amount signal 314 fails once, a target point arrival signal (distance matching signal) 322 is output. The target point arrival signal (distance matching signal) 322 is the bit feeding electric motor corrector.
It is sent to the reverse rotation determination circuit 212. The bit feeding electric motor forward/reverse rotation determination circuit 212 converts the reverse rotation signal 323 into a reverse rotation signal 323 and supplies it to the operating state determination circuit 206 .

The operating state determination circuit 206 converts the control signal 328 into a control signal 328 and supplies it to the bit sending motor control circuit 203. As a result, the bit feed motor control circuit 2o3 reverses the bit feed motor 16 to pull out the core bit 13.

When the core bit 13 is pulled out in this manner and the core bit 13 returns to its origin position, the tag bit origin position detector 39 outputs an origin position detection signal 324, which is received by the operating state determination circuit 206 and used for the next It behaves like this. In the operating state determination circuit 206, the core bit l3
is determined to have passed, and provides a start/stop operation signal 327 to the bit rotation motor control circuit 207 and a control signal 328 to the bit feeding motor control circuit 203.
As a result, the bit rotating electric motor 11 and the bit feeding electric motor 16 stop rotating. Further, when the origin position detection signal 324 is input manually, the operating state determination circuit 206 notifies the completion of cutting by lighting the cutting completion indicator 403 and by sounding the cutting completion audible alarm 404. Since it is controlled in this way, if the operator sets the cutting distance in advance on the cutting distance setting device 38, drilling will start simply by pressing the start switch 40, and then the machine will automatically return to the original position. The operator does not need to perform any operations. In this third control means 3C, a target point arrival signal (distance matching signal) 322 is obtained from the target point arrival detection means 260 as follows. The moving distance is set in the cutting distance setting device 38 in advance. Then, a distance setting signal 313 is given from the cutting distance setting device 38 to the cutting judgment circuit 210. When the cutting operation starts, the cutting judgment circuit 2!0 receives a moving distance signal 31 from the bit moving distance detector 37.
4 is input. The cutting judgment circuit 210 compares the distance setting signal 313 and the moving distance signal 314, and if they match, it judges that the core bit 13 has reached the target cutting point and outputs a target point arrival signal (distance matching signal) 322. do.

As a result, a target point arrival signal (distance matching signal) 322 is obtained. Further, in the third control means 3C, the target point arrival detection means 260 may obtain the target point arrival signal (distance matching signal) 322 in the following manner.

In other words, the bit rotation motor current determination circuit 208 is
The load current value signal 303 detected by the load current detector 36 that detects the load current of the electric motor 11 for bit rotation is taken in, and when it is determined that this exceeds a preset value, a target point arrival signal (cutting hole penetration signal) is generated. 321 is output. Therefore, this target point arrival signal (cutting hole penetration signal) 32l may be used. [Operation of the fourth control means 3D] When the cutting speed abnormality detection means 270 detects that the cutting speed has decreased abnormally, the cutting feed rate classification circuit 20
4a, a cutting feed rate abnormal decrease signal 330 is output. The cutting feed rate abnormal decrease signal 330 from the cutting feed rate classification circuit 204a is input to the forward/reverse rotation means 280. In the forward/reverse rotation means 280, when the cutting feed rate abnormal decrease signal 330 is input, the bit feeding electric motor l6 is reversely rotated, and after a certain period of time, the bit feeding electric motor l6 is turned on.
Rotate 6 in the forward direction. The operation of the forward/reverse rotation means 280 is repeated a certain number of times by the repetition count circuit 2l4. The repetition count circuit 214 counts this repetition, and outputs a signal 326 to the operating state determination circuit 206 when the repetition is repeated, for example, three times. Operation state bear judgment circuit 20
6, a start/stop operation signal 327 is given to the bit rotation motor control circuit 207, and a control signal 328 is given to the pit feed motor control circuit 203. As a result, the bit rotating electric motor 11 and the bit feeding electric motor 16 stop. Further, the operating state determination circuit 206 outputs a signal 332 to sound an abnormal state audible alarm 407 to notify the abnormal state, and lights up an abnormal feed rate decrease indicator 406.

Here, in this fourth control means 3D, the cutting feed rate abnormal decrease signal 330 detected by the cutting speed abnormality detection means 270 is detected as follows. That is, the cutting feed rate classification circuit 204a outputs the cutting feed rate abnormal decrease signal 330 due to an abnormal decrease in the input voltage of the bit feeding motor 16, so this signal is used.

Further, in this fourth control means 3D, the cutting feed rate abnormal decrease signal 330 detected by the cutting speed abnormality detection means 270 is detected as follows. That is, the cutting feed rate classification circuit 204a is the bit feeding electric motor 16.
Since the cutting feed rate abnormal decrease signal 330 is output due to an abnormal decrease in the rotation speed of the machine, this may be used. Furthermore, in the fourth control means 3D, the cutting feed rate abnormal decrease signal 330 detected by the cutting speed abnormality detection means 270 is detected as follows. That is, the cutting feed rate classification circuit 2 0 4 a LL feed mechanism 15
When the bit feed rate detector 34 detects an abnormal decrease in the feed rate, the cutting feed rate abnormal decrease signal 330 is output, so this may be used. By controlling in this way, the core bit l
Just before the cutting edge of step 3 bites into the workpiece, pull it back,
Re-cutting can be continued, and core bit l3
If re-cutting is not possible due to damage or wear on the cutting edge, the bit feeding motor 16 can be brought to an emergency stop without being overloaded or performing forced cutting.

[Operation of the fifth control unit 3E] The cooling water supply means 24 is capable of supplying cooling water to the core bit 18. Further, a control valve 25 is provided in the passage of the cooling water supply stage 24. In the fifth control unit 3E, when the start switch 40 is pressed and the operation starts,
The control valve 25 is opened and the control valve 25 is controlled to be closed after cutting is completed. Here, when the start switch 40 is pressed,
A start signal 306 is given to the operating state determination circuit 206. The operating state determination circuit 206 applies a valve opening/closing signal 331 to the control valve 25, whereby the control valve 25 is opened. Then, when the cutting completion signal is input, the control valve 25 is closed.

Here, in the fifth control unit 3, the cutting completion signal is the target point arrival signal 36 from the target point arrival detection means 260.
You can also use 0. [Operation of a modified example of the fifth control section 3E] Further, a control valve 25 is provided in the passage of the cooling water supply stage 24. In another embodiment of the fifth control unit 3E, when the start switch 40 is pressed and the operation starts, the control valve 25 is opened and the cooling water amount decrease signal 33 is sent from the cooling water amount detector 3l.
When 3 is manually operated, the control valve 25 is closed and the device is stopped. Furthermore, as another embodiment of the cooling water amount detector 31, when the start switch 40 is pressed to start, the control valve 2
5 is opened, and the control valve 31 is controlled to be closed when a cooling water amount reduction signal 333 from the cooling water amount detector 31 is input, and the bit feeding motor 16 is controlled to be reversed and returned to its original position. . At this time, when the start switch 4o is pressed, the start signal 306 is given to the operating state determining circuit 206, so the operating state determining circuit 206
opens the control valve 25. When the signal 323 from the bit feeding electric motor forward/reverse rotation judgment circuit 212, the stop signal 307 from the stop switch 41, and the cooling water amount decrease signal 333 from the cooling water amount detector 31 are input into the operating state judgment circuit 206, the control valve 31, and also controls the bit feeding motor 16 to reverse and return to its original position. By executing this kind of control, cooling water is supplied at the start of cutting, and when cutting is completed or when an abnormality occurs when the amount of cooling water decreases, it is automatically performed without operator judgment, operation, or monitoring of the amount of cooling water during operation. It is possible to supply and stop cooling water, and to handle abnormalities. Note that the operating state determination circuit 206 uses the cutting start indicator light 40.
1. Cutting stop indicator light 402, cutting completion indicator light 403, bit rotating electric motor 1. 1 overcurrent indicator light 405, abnormal feed rate decrease indicator light 406, cooling water amount decrease indicator light 40B
A predetermined display is made using the cutting completion audible alarm 404 and an abnormal state audible annunciator 407 is used to make a predetermined audible notification. [Effects of the Invention] As described above, according to the present invention, the dimensions of the core bit are selected, the cutting target current value of the first electric shift machine is set according to the selection signal, and the load current of the first electric motor is detected. The load current detected by the current detecting means is compared with the cutting target current value from the current value setting means, and the second motor of the feed drive transmission section is adjusted so that the load current of the first motor becomes the cutting target current value. By comprising a control means for controlling the rotation of the core bit, it is possible to improve the cutting efficiency and extend the life of the cutting edge of the core bit.

Further, according to the present invention, the speed at which the core bit is fed by the feeding mechanism is detected, the cutting target current value of the first electric motor is set according to the detection signal from the feeding speed detection means, and the cutting target current value of the first electric motor is set. The load current detected by the current detection means for detecting the current is compared with the cutting target current value from the current value setting means, and the feed drive transmission section is adjusted so that the load current of the first motor becomes the cutting target current value. By controlling the rotation of the second electric motor, the above-mentioned cutting efficiency can be improved and the life of the cutting edge of the core bit can be extended. Then, according to the present invention, the rotational speeds of the first electric motor and the second electric motor are limited to a certain low value at the time of starting, and the restriction is canceled by a cancellation signal from a predetermined condition establishing means, so that the rotation speeds are maintained at the desired rotation speed. By providing a start-up control section that makes the machine smoother, it is possible to protect against the above-mentioned impact and improve cutting accuracy. Here, according to the present invention, the release signal is output when the detection signal from the current detection means for detecting the load current of the first motor exceeds a preset value, so the release signal is reliably output. ．． Furthermore, according to the present invention, the time is measured at the time of startup and the release signal is output after the set time has elapsed, so the release signal is reliably output. Further, according to the present invention, a release signal is output when the core bit reaches a position after moving a predetermined distance after starting, so a release signal corresponding to reality is output. According to the present invention, the second electric motor is reversed by the target point arrival signal from the target point arrival detection means, and when the original position detection means detects that the core bit has returned to the original position, the first electric motor Since the two electric motors are stopped, the labor of the operator can be reduced.

Here, the present invention determines that the core bit has reached the set distance of the post-start cutting movement distance setting means based on the detection signal from the movement distance detection means and outputs a target point arrival signal.
It is possible to reliably detect when the target point has been reached. Further, in the present invention, the target point arrival signal is output when the detection signal from the current detection means for detecting the load current of the first electric motor falls below a preset value, so that reaching the target point can be reliably detected. can. In the present invention, the second electric motor is reversed by the cutting speed abnormality reduction signal from the cutting speed abnormality detecting means, and the second electric motor is rotated forward after a certain period of time, and the operation of the forward and reverse rotation means is repeated a certain number of times. , it is possible to reduce the labor of the above-mentioned workers. Here, in the present invention, an abnormal cutting speed reduction signal is output when the manual voltage of the second electric motor is abnormally reduced, so that it is possible to reduce the labor of the operator.

Further, according to the present invention, an abnormal cutting speed reduction signal is output when the rotational speed of the second electric motor is abnormally reduced, so that it is possible to reduce the labor of the operator.

Furthermore, the present invention outputs an abnormal cutting speed reduction signal when the feed speed of the feed mechanism has abnormally decreased, so that it is possible to reduce the labor of the operator. The present invention provides cooling water supply means for supplying cooling water to the core bit, and also provides a control valve in the passage of the cooling water supply means, and controls the control device to open the control valve at the time of start-up, and to open the control valve after cutting is completed. Since the control valve is closed, the labor of the operator can be reduced.

Here, in the present invention, the completion of cutting is determined by the target point arrival signal from the target point arrival detection means for detecting that the core bit has reached the target point, so that the completion of cutting can be reliably detected. The present invention provides a cooling water supply means for supplying cooling water to the core bit, and also provides a control valve and a cooling water amount detection means in a passage of the cooling water supply means, and opens the control valve at the time of startup, and the cooling water amount detection means Since the control valve is controlled to be closed and the apparatus is stopped when a cooling water amount reduction signal is input from the control valve, the labor of the operator can be reduced.

The present invention provides a cooling water supply means for supplying cooling water to the core bit, and also provides a control valve and a cooling water amount detection means in a passage of the cooling water supply means, and opens the control valve at the time of startup to detect the cooling water amount. When the cooling water amount reduction signal from the means is input manually, the control valve is controlled to be closed, and the second electric motor is controlled to reverse and return to the original position, so that the labor of the worker can be reduced. can.

[Brief explanation of 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 same embodiment, and FIG.
Fig. 4 is a block diagram showing the same embodiment, Fig. 4 is a sequence diagram for explaining the operation of the same embodiment, Fig. 5 is a characteristic diagram showing the relationship between torque and load current of the AC commutator motor, and Fig. 6 Figure 7 is a characteristic diagram showing the relationship between load current and rotational speed of an AC commutator motor, Figure 7 is a characteristic diagram showing the relationship between core bit rotational speed and peripheral speed of the core bit cutting edge, and Figure 8 is a characteristic diagram showing the relationship between core bit rotational speed and core bit cutting edge circumferential speed. Characteristic diagram showing the relationship between cutting speed and cutting feed rate,
FIG. 9 is a time chart showing the relationship between the load current of the first motor and the feed rate during cutting operation, and FIG. 10 is an attached flow chart for explaining the operation of the conventional device. DESCRIPTION OF SYMBOLS 1... Drilling machine, 3... Control device, 11... Bit rotation electric motor (first electric motor), 13... Core bit,
l4... Rotational drive transmission section, 15... Feeding mechanism, l6
... Electric motor for bit feeding, 18... Feed drive transmission unit, 30... Operation panel, 31... Cooling water amount detection means, 32... Human power voltage detector, 33... Rotation speed detector , 34... Bit feed speed detector, 35... Focus dimension selection stock 36... Load current detector, 37... Bit movement distance detector, 38... Cutting distance setter, 39
. . . Bit origin position detector, 40 . . . Start switch, 3A to 3E . . . Control means.

Claims (1)

[Scope of Claims] (1) A rotational drive transmission unit that includes a first electric motor and rotates the core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission unit that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of a drilling machine, comprising: a selector for selecting a core bit size; and a current value setting means for setting a cutting target current value for a first electric motor in response to a selection signal from the selector. and comparing the load current detected by the current detection means for detecting the load current of the first motor with the cutting target current value from the current value setting means so that the load current of the first motor becomes the cutting target current value. and a control means for controlling the rotation of the second electric motor of the feed drive transmission section. (2) A drilling machine equipped with a rotational drive transmission section that includes a first electric motor and rotates a core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission section that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of the feed speed detecting means for detecting the speed at which the core bit is fed by the feeding mechanism, and setting a cutting target current value of the first electric motor according to a detection signal from the feed speed detecting means. Current value setting means compares the load current detected by the current detection means for detecting the load current of the first motor with the cutting target current value from the current value setting means, and determines that the load current of the first motor is the cutting target current. a control device for controlling the rotation of the second electric motor of the feed drive transmission section so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission section is controlled so that the rotation of the second electric motor of the feed drive transmission unit is (3) A drilling machine comprising a rotational drive transmission section that includes a first electric motor and rotates a core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission section that includes a second electric motor and drives the feed mechanism. In a control device for controlling the operation of the first electric motor and the second electric motor, the rotational speed of the first electric motor and the second electric motor is limited to a certain low value at the time of starting, and the restriction is canceled by a cancellation signal from a predetermined condition establishing means to perform the desired operation. What is claimed is: 1. A control device for a drilling machine, characterized in that it is configured by providing a start control section to bring the machine into a rotating state. (4) A claim characterized in that the condition establishing means is configured to output a release signal when the detection signal from the current detection means for detecting the load current of the first motor exceeds a preset value. Item 3. A control device for a drilling machine according to item 3. (5) The control device for a drilling machine according to claim 3, wherein the condition establishing means comprises a timer that measures time at the time of startup and outputs a release signal after a set time limit has elapsed. (6) The control device for a drilling machine according to claim 3, wherein the condition establishing means is configured to output a release signal when the core bit reaches a position after it has moved a predetermined distance after being started. (7) A drilling machine equipped with a rotational drive transmission section that includes a first electric motor and rotates a core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission section that includes a second electric motor and drives the feed mechanism. In the control device for controlling the operation of the core bit, the original position detecting means detects the original position of the core bit before starting, the target point reaching detecting means detects that the core bit has reached the target point, and the target point reaching detecting means control means for reversing the second electric motor in response to a target point arrival signal and stopping the first electric motor and the second electric motor when the original position detection means detects that the core bit has returned to the original position. Characteristic drilling machine control device. (8) The target point arrival detection means includes a movement distance detection means for detecting the movement distance of the core bit, a cutting movement distance setting means for setting the cutting movement distance, and a movement distance set by the post-start cutting movement distance setting means. Claim 7 characterized in that it is comprised of determination means for determining that the core bit has reached the target point based on the detection signal from the detection means and outputting a target point arrival signal.
Control device for the described drilling machine. (9) The target point arrival detection means is configured to output a target point arrival signal when the detection signal from the current detection means for detecting the load current of the first motor falls below a preset value. The control device for a drilling machine according to claim 7, characterized in that: (10) A drilling machine comprising a rotational drive transmission section that includes a first electric motor and rotates a core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission section that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of the second electric motor includes a cutting speed abnormality detection means for detecting an abnormal decrease in cutting speed, and a cutting speed abnormality reduction signal from the cutting speed abnormality detection means to reverse the second electric motor and to maintain a constant cutting speed. 1. A control device for a drilling machine, comprising a forward/reverse rotation means for forwardly rotating a second electric motor after a time limit, and a repeating means for repeating the operation of the forward/reverse rotation means a predetermined number of times. (11) The drilling machine according to claim 10, wherein the cutting speed abnormality detection means is configured to output an abnormal cutting speed reduction signal when the input voltage of the second electric motor has abnormally decreased. Control device. (12) The drilling machine according to claim 10, wherein the cutting speed abnormality detection means is configured to output an abnormal cutting speed reduction signal when the rotational speed of the second electric motor has abnormally decreased. Control device. (13) The control of the drilling machine according to claim 10, wherein the abnormal cutting speed detection means is configured to output an abnormal cutting speed reduction signal when the feeding speed of the feeding mechanism has abnormally decreased. Device. (14) A drilling machine comprising a rotational drive transmission section that includes a first electric motor and rotates a core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission section that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of the core bit is provided with a cooling water supply means for supplying cooling water to the core bit, and a control valve is provided in a passage of the cooling water supply means, and the control device is configured to open the control valve at the time of startup. . A control device for a drilling machine, comprising a circuit that closes the control valve after cutting is completed. (15) The drilling machine according to claim 14, wherein the control device is configured to complete cutting in response to a target point arrival signal from a target point arrival detection means for detecting that the core bit has reached the target point. Control device. (16) A drilling machine comprising a rotational drive transmission section that includes a first electric motor and rotates a core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission section that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of the core bit is provided with a cooling water supply means for supplying cooling water to the core bit, a control valve and a cooling water amount detection means are provided in a passage of the cooling water supply means, and the control device is configured to A control device for a drilling machine, characterized in that a circuit is configured to open the control valve and control the control valve to close when a cooling water amount decrease signal from the cooling water amount detection means is input, and also to stop the device. . (17) A drilling machine comprising a rotational drive transmission section that includes a first electric motor and rotates a core bit, a feed mechanism that moves the core bit forward and backward, and a feed drive transmission section that includes a second electric motor and drives the feed mechanism. A control device for controlling the operation of the core bit is provided with a cooling water supply means for supplying cooling water to the core bit, a control valve and a cooling water amount detection means are provided in a passage of the cooling water supply means, and the control device is configured to A circuit that controls to open the control valve and close the control valve when a cooling water amount reduction signal from the cooling water amount detection means is input, and controls to reverse the second electric motor and return it to the original position. A control device for a drilling machine, characterized in that: