KR102307486B1 - Starting and stopping power controlling of tapping machines - Google Patents

Abstract

A large number of small-capacity capacitors are used for charging for starting and stopping power, and the charging and charging power are used as instantaneous voltage to enable the spindle to rotate at high speed during start-up, and momentarily to spin the spindle when stopped. It is designed to be stopped, and when initial power is supplied, start and stop power is charged using a small-capacity capacitor, and when starting, the charging power is used as an instantaneous start voltage, and when the spindle is stopped, the charging power is used as an instantaneous stop voltage. This causes the spindle to momentarily stop driving.

Description

Starting and stopping power controlling of tapping machines

The present invention relates to an apparatus for controlling starting and stopping power for tapping machines, and in particular, utilizing a large number of small-capacity capacitors for charging for starting and stopping power, and capacity of a power supply such as starting and stopping When a load exceeding the It relates to a stationary power supply control device.

In general, when assembling parts of machines or industrial devices, they are mainly assembled using bolts and nuts. To form a threaded hole in metal, first drill a hole with a dimension slightly smaller than the outer diameter of the bolt to be inserted into the threaded hole, and insert a tab with the appropriate dimension corresponding to the hole into the hole to supply lubricant or cutting oil at low speed. It is rotated while feeding to form a screw thread that is screwed with the bolt according to the size and shape of the screw of the tab on the inner surface of the hole. A device for forming a thread in this way is called a tapping machine (tapping machine).

Such a tapping machine has a tapping chuck (spindle chuck) for fixing the tab, and an electric motor for rotating the tapping chuck is provided. As an electric motor, a BLDC motor is usually used.

When starting a machining operation using a tapping machine, a lot of initial starting current is required, and a lot of current is needed to momentarily stop the tapping chuck when machining is finished.

In general, a tapping machine increases an initial output voltage to increase a starting current, and when stopped, a reverse current is applied to stop the tapping chuck. At this time, during a stop, more overcurrent flows than the capacity of the power supply, which is the power supply, and the power supply is often down, which causes a disadvantage in that the working time is lengthened.

On the other hand, the conventionally proposed technology for a tapping machine is disclosed in the following <Patent Document 1> to <Patent Document 4>.

The prior art disclosed in <Patent Document 1> is a tapping machine in which an operation bed having a handle is installed in the frame of a magnet base and a fixing rod for attaching an air gun is attached to the front surface of the operation bed, and a spindle is located on the working bed below the air gun holder. While attaching and supporting the mounting bracket with bolts, the spindle device having a spindle that can be fitted with a normal tab and chuck is combined with a bolt, and the upper end of the spindle is installed by inserting an air gun inside, so that the spindle moves forward/removed according to the operation of the air gun. It is configured to rotate in reverse.

In addition, in the prior art disclosed in <Patent Document 2>, when the workpiece supplied through the guide chute by the rotation of the material supply device is continuously supplied to the upper jigrail, a clamp using an air cylinder performs the operation while fixing the workpiece, It provides an automatic tapping machine that automatically loads the work-completed work piece, that is, the work piece on which the female threading is completed, through the lower hopper and automatically loaded into the work-piece storage box. Since the operator only needs to operate the control box by such an automatic tapping machine, it is possible to increase the precision of the operation, make mass processing possible, and improve safety, thereby improving efficiency compared to the existing operation type.

In addition, the prior art disclosed in <Patent Document 3> is a BLDC motor, a fan formed on one side of the BLDC motor to cool the heat generated according to the driving of the BLDC motor, a control unit, an inductor, a pulse width modulator, a pulse width modulator It includes an output filter that converts the DC power modulated by the AC to 3-phase AC power and supplies it to the stator of the BLDC motor, and a switching element that adjusts the ON/OFF time of the DC power input to the pulse width modulator according to the control of the control unit. to implement the driver. Through this configuration, durability can be improved, energy waste can be prevented through high energy efficiency, and a compact and lightweight core drill is provided.

In addition, the prior art disclosed in <Patent Document 4> improves the control efficiency of the power tool by electrically shifting using a BLDC motor and then performing a mechanical shift when necessary in response to the torque. make it

Republic of Korea Registered Utility Model 20-0193336 (Registered on Sep. 2000, 2000) (Simple tapping machine) Republic of Korea Registered Utility Model 20-0291303 (Registered on Sep. 25, 2002) (Auto-tapping machine) Republic of Korea Patent Registration 10-1124082 (Registered on Feb. 28, 2012) (Core drill with BLC motor) Republic of Korea Patent Publication 10-2015-0071895 (published on June 29, 2015) (Power tool and power tool control method)

However, since the general tapping machine and the prior art as described above use a method of increasing the initial output voltage when starting that requires a high current, there is a disadvantage in that excessive power is consumed due to the increase of the initial output voltage, and when the spindle is stopped, the spindle quickly Since it is a method of applying a reverse current to stop the , there is a disadvantage that a separate reverse current applying device must be provided.

Here, if the spindle is not stopped momentarily at the time of completion of machining, defects occur in the workpiece, so a method of temporarily stopping the spindle by applying a reverse current using a separate device such as a reverse current applying device is used.

In particular, the reverse current is used by the reverse current applying device during a stop, and at this time, the power supply may be down due to an overcurrent exceeding the capacity of the power supply. When the power supply goes down, A/S is required, which causes a delay in work, which in turn causes a decrease in overall productivity.

Therefore, the present invention has been proposed to solve the problems occurring in the general tapping machine and the prior art as described above, and utilizes a large number of small-capacity capacitors for charging for starting and stopping power, starting and stopping, and When a load exceeding the capacity of the same power supply occurs (starting, stopping), the capacitor power supply charging and discharging power is used as an instantaneous voltage so that the spindle rotates at high speed during startup and stops the spindle momentarily when stopped. An object of the present invention is to provide a starting and stopping power control device for a tapping machine.

Another object of the present invention is to use a large number of low-cost, small-capacity capacitors as a power charging device, and by using them to supply additional power during start and stop, stable power supply and power supply even when a load exceeding the capacity of the power supply occurs. It is to provide a starting and stopping power control device for a tapping machine to prevent the down of the tapping machine.

In order to achieve the above object, "a device for starting and stopping power supply of a tapping machine" according to the present invention includes a selection switch for function selection; a controller for controlling the operation of the tapping machine according to the operation and stop operation signals by the selection switch; a relay unit for operating a power relay under the control of the controller; a power supply that converts commercial AC power supplied according to an ON operation of the power relay of the relay unit into a predetermined DC power and outputs the converted power; a charging power control unit configured to supply or cut off the DC power supplied from the power supply as charging power according to the control of the controller; a starting and stopping power supply unit for charging the power output from the charging power control unit and supplying the charging power as starting and stopping power; a driving power supply unit for supplying motor driving power with power supplied from the power supply and power supplied from the start and stop power supply unit; A motor driving unit that drives a BLDC motor for driving a spindle that operates a chuck equipped with a tap with power supplied from the driving power supply, or stops the BLDC motor with power supplied from the driving power supply when stopped under the control of the controller It is characterized in that it includes.

In addition, the starting and stopping power control apparatus of the tapping machine according to the present invention includes a voltage detection unit that detects the charging voltage of the starting and stopping power supply and provides it to the controller, wherein the controller is detected by the voltage detection unit Comparing a voltage and a preset reference voltage for supplying and blocking the voltage, and controlling the charging power control unit according to the difference, the power supply of the starting and stopping power supply units is controlled.

In the start and stop power supply unit, a plurality of single charging means made of a capacitor and a resistor are provided, and the plurality of charging means are connected in series.

In the above, the start and stop power supply unit supplies charging power as an instantaneous voltage when starting, and supplies charging power as instantaneous power when stopping.

In the above, the motor driving unit drives the BLDC motor by adding the power supplied from the power supply and the power supplied from the start and stop power supply unit when starting, and at the time of stopping the power supplied from the power supply and the starting and stopping power supply unit. It is characterized in that the BLDC motor is stopped by summing the discharged charging power.

According to the present invention, a plurality of small-capacity capacitors are used for charging for starting and stopping power, and when a load exceeding the capacity of the power supply such as starting and stopping occurs (starting and stopping), the capacitor power is charged and charged. By using the power supply as an instantaneous voltage, it enables high-speed rotation of the initial spindle at start-up and instantaneous stop of the spindle when stopped. It has the advantage of stabilizing the starting and stopping power and stopping the spindle momentarily when stopped.

In addition, according to the present invention, a large number of low-cost small-capacity capacitors are used as a power charging device, and additional power is supplied during start-up and stop using them, thereby preventing the power supply from going down even when a load exceeding the capacity of the power supply occurs. There are advantages to doing.

1 is a block diagram of a starting and stopping power control device of a tapping machine according to the present invention;
2 is a circuit diagram of an embodiment of the relay unit and the power supply of FIG. 1;
3 is a circuit diagram of a relay switch operation of the timer relay of FIG. 1;
4 is a circuit diagram of an embodiment of the start and stop power supply of FIG. 1;
5 is a circuit diagram of an embodiment of the driving power supply of FIG. 1 .

Hereinafter, an apparatus for controlling the starting and stopping power of a tapping machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a start and stop power control device for a tapping machine according to a preferred embodiment of the present invention, a selection switch 10 for function selection, and operation and stop operation selected by the selection switch 10 A controller 50 that controls driving of the tapping machine according to a signal, a relay 20 that operates a power relay according to the control of the controller 50, and a power relay of the relay 20 are supplied according to the ON operation of the relay A power supply 30 that converts commercial AC power to be converted into a predetermined DC power and outputs it, and a charging power that supplies or cuts the DC power supplied from the power supply 30 as charging power according to the control of the controller 50 The control unit 90, the start and stop power supply unit 40 for charging the power output from the charging power control unit 90 and supplying the charging power as starting and stopping power, the power supplied from the power supply 30 and A driving power supply unit 60 for supplying motor driving power with power supplied from the starting and stopping power supply unit 40, and a spindle driving for operating a chuck equipped with a tap with power supplied from the driving power supply unit 60 and a motor driving unit 70 for driving the BLDC motor 80 or stopping the BLDC motor 80 with power supplied from the driving power supply unit 60 when stopped under the control of the controller 50 .

In addition, the apparatus for controlling the starting and stopping power of the tapping machine according to the present invention includes a voltage detecting unit 95 that detects the charging voltage of the starting and stopping power supply unit 40 and provides it to the controller 50 . The controller 50 compares the voltage detected by the voltage detection unit 95 with a reference voltage preset for voltage supply and cutoff, and controls the charging power control unit 90 according to the difference to control the starting and stopping power Controls the supply power of the supply unit (40).

The relay unit 20 includes a power on/off relay 21 that interlocks according to a power on/off switch, and a power relay 22 that supplies and cuts power to the power supply 30 .

In addition, as shown in FIG. 3 , the start and stop power supply unit 40 is provided with a plurality of charging means (C1 - C9, R1 - R9) consisting of a capacitor (C) and a resistor (R), the plurality of The charging means provided with the are connected in series. Here, 9 pairs of capacitors and resistors constituting the charging means are shown, but the present invention is not limited thereto, and it is possible to reduce or increase the capacitor and resistor pairs constituting the charging means according to the capacity of the tapping machine. Anyone with ordinary knowledge of The starting and stopping power supply unit 40 supplies charging power as instantaneous power for starting when starting, and supplies charging power as instantaneous power for stopping when stopping.

In addition, the motor driving unit 70 drives the BLDC motor 80 by adding the power supplied from the power supply 30 and the starting and stopping power supply unit 40 when starting, and when stopping, the power The BLDC motor 80 is stopped by combining the power supplied from the supply 30 and the charging power discharged from the start and stop power supply unit 40 .

The operation of the starting and stopping power control apparatus of the tapping machine according to the preferred embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings 1 to 5 as follows.

First, when the user operates the power switch formed on the external panel to the on state in order to drill (tap work) on the work target using the tapping machine, the power relay ( 21) operates to supply commercial AC power to the tapping machine.

In a state in which the power switch is operated in an on state, the controller 50 recognizes a function selected by the selection switch 10 . Here, the selector switch includes a tapping machine drilling on or off function.

When the tapping machine on function is selected, the controller 50 drives the power supply relay 22 of the relay unit 20 in an ON state. When a current flows through the coil of the power supply relay 22 according to the on drive, the relay switch 22a interlocking therewith is turned on, and contacts 1 and 2 are connected, and contacts 3 and 4 are connected. When the relay switch 22a operates in an on state, commercial AC power (230V AC/60Hz) is supplied to the power supply 30 .

In this way, when the user selects the drilling-on function to use the tapping machine (drilling switch-on), commercial AC power is supplied to the power supply 30 .

The power supply 30 generates a predetermined DC voltage (23V DC) by using a full-wave rectifier, a smoother, a constant voltage device, and the like provided therein for commercial AC power to be supplied.

The DC voltage output from the power supply 30 is supplied as a starting and stopping power supply unit 40 and a drill voltage, at which time, at the beginning of driving, the power switch of the charging power control unit 90 under the control of the controller 50 ( 92) maintains the on state, converts the power supplied from the power supply 30 through the DC/DC converter 91 into a predetermined DC voltage, and supplies the starting and stopping power supply unit 40 as charging power. .

As shown in FIG. 3 , the start and stop power supply unit 40 is provided with a plurality of charging means (C1 - C9, R1 - R9) consisting of a capacitor (C) and a resistor (R), and the plurality of The provided charging means are connected in series to sequentially charge.

That is, at the initial stage of driving of the tapping machine, the starting and stopping power supply unit 40 is primarily charged.

When the charging of the starting and stopping power supply unit 40 starts, the voltage detecting unit 95 detects a charging voltage state of the starting and stopping power supply unit 40 . Here, the voltage detection unit 95 may detect a voltage using a detection device such as a general current transformer or a transformer. The detected voltage value is transmitted to the controller 50 in real time.

The controller 50 compares the detected voltage detected by the voltage detection unit 95 with a reference voltage preset for voltage supply and cut-off, and controls the charging power control unit 90 according to the difference to control the start-up and Controls the supply power of the stop power supply unit (40). That is, when the detection voltage is lower than the reference voltage, the charging power switch 92 is maintained in an on state to perform power charging. On the other hand, when the detection voltage is equal to or greater than the reference voltage, the charging power switch 92 ) to turn off the power supply to stop charging.

When the charging of the start and stop power supply unit 40 is completed, the relay of the driving power supply unit 60 operates in an on state under the control of the controller 50 . That is, current flows through the relay coils of the charging relay 61 and the drill power relay 62 to be turned on at the same time, and each relay switch 61a is interlocked with the relay coil of the charging relay 61 and the drill power relay 62 . ) 62a is turned on (contact 1 and contact 2 connection, contact 3 and contact 4 connection) to supply drill power to the motor driving unit 70 .

Next, the motor driving unit 70 operates the BLDC motor 80 with drill power supplied under the control of the controller 50 . A spindle is connected to the BLDC motor 80, and a chuck equipped with a tab is connected to the spindle, and the tab rotates according to the rotation of the spindle to perform a tapping operation.

At this time, a large starting current is required at the initial stage of the tapping operation. In accordance with the need for such a starting current, a method of increasing the starting current by increasing the initial output voltage was used in the prior art. If the initial output voltage is increased, power consumption increases, and accordingly, the capacity of the power device must be increased, so that the implementation cost of the tapping machine is also high.

In order to improve this disadvantage, the present invention implements a plurality of low-cost small-capacity capacitors in series, and after charging for a certain time before starting, supplies the charging current as an instantaneous starting current during actual startup, thereby increasing the initial output voltage. It is possible to increase the starting instantaneous voltage in a state where it is not in the normal state, so that a stable starting current is supplied even during the initial startup.

That is, the drill power basically uses the general drill supply power supplied from the power supply 30, and the additional starting current required at the time of initial startup is by using the charging power of the starting and stopping power supply unit 40 together, It is possible to supply a stable starting current by increasing the instantaneous voltage (current) during initial startup.

On the other hand, when the tapping operation is completed during the tapping operation by drilling with the drill power supply as described above and the operator operates the drill machine off switch, the controller 50 recognizes this and gives a stop command to the motor driving unit 70 transmit

According to this stop command, the motor driving unit 70 turns off the driving current of the BLDC motor 80 to stop the operation of the drill machine, that is, the spindle.

At this time, if the spindle is stopped using a general spindle stop voltage, the spindle does not stop instantaneously, but stops as the rotation gradually decreases. When the actual tapping operation is completed, the spindle must be stopped momentarily to prevent work failure.

Therefore, in order to momentarily stop the spindle after completion of the work, a reverse current was used in the past. In order to use the reverse current, it is necessary to implement a separate reverse current applying device, which complicates the configuration of the device and incurs additional costs.

Therefore, in order to improve this disadvantage, in the present invention, when a stop command is transmitted by the driving power supply unit 60 and the motor driving unit 70 by the controller 50, the driving power supply unit 60 starts and stops the starting and stopping power supply unit 40 ) is combined with the general stop voltage and supplied as an instantaneous stop voltage.

Using the instantaneous stop voltage supplied in this way, the motor driving unit 70 instantaneously stops the BLDC motor 80, thereby temporarily stopping the spindle.

That is, in the present invention, when the tapping operation is completed to stop the spindle, the stop voltage supplied from the power supply 30 and the discharge voltage discharged from the start and stop power supply unit 40 are added to increase the stop voltage momentarily to increase the stop voltage of the spindle. used for stopping.

Accordingly, product defects are prevented by temporarily stopping the spindle by simply using a discharge voltage without using a separate reverse current during the stop operation.

If the drill machine is turned on again after stopping, it starts charging after charging in the same way as before.

Although the invention made by the present inventor has been described in detail according to the above embodiment, the present invention is not limited to the above embodiment, and it is common knowledge in the art that various changes can be made without departing from the gist of the present invention. It will be self-evident to those who have

10: select switch
20: relay unit
30: power supply
40: start and stop power supply
50: controller
60: drive power supply
70: motor driving unit
80: BLDC motor
90: charging power control unit
95: voltage detection unit

Claims (5)

A device for controlling the power of a tapping machine, comprising:
selection switch for function selection;
a controller for controlling the operation of the tapping machine according to the operation and stop operation signals by the selection switch;
a relay unit for operating a power relay under the control of the controller;
a power supply that converts commercial AC power supplied according to an ON operation of the power relay of the relay unit into a predetermined DC power and outputs the converted power;
a charging power control unit configured to supply or cut off the DC power supplied from the power supply as charging power according to the control of the controller;
a starting and stopping power supply unit for charging the power output from the charging power control unit and supplying the charging power as starting and stopping power;
a driving power supply unit for supplying motor driving power with power supplied from the power supply and power supplied from the start and stop power supply unit; and
A motor driving unit that drives a BLDC motor for driving a spindle that operates a chuck equipped with a tap with power supplied from the driving power supply unit, or stops the BLDC motor with power supplied from the driving power supply unit when stopped under the control of the controller Start and stop power control device of the tapping machine, characterized in that it comprises a.
The method according to claim 1, comprising a voltage detection unit that detects the charging voltage of the start and stop power supply and provides it to the controller,
The controller compares the voltage detected by the voltage detection unit with a preset reference voltage for voltage supply and cutoff, and controls the charging power control unit according to the difference to control the supply power of the start and stop power supply units A control device for starting and stopping power for tapping machines.
The apparatus of claim 1, wherein the starting and stopping power supply unit includes a plurality of charging means made of a capacitor and a resistor, and the plurality of charging means are connected in series.
The starting and stopping power control device for a tapping machine according to claim 1 or 3, wherein the starting and stopping power supply unit supplies charging power as an instantaneous voltage when starting, and supplies charging power as instantaneous power when stopping. .
The method according to claim 1, wherein the motor driving unit drives the BLDC motor by adding the power supplied from the power supply and the power supplied from the start and stop power supply unit when starting, and when the motor is stopped, the power supplied from the power supply and the start and stop A starting and stopping power control device for a tapping machine, characterized in that it stops the BLDC motor by summing the charging power discharged from the power supply.

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