WO2019124008A1

WO2019124008A1 - Tool, and control circuit and control method for tool

Info

Publication number: WO2019124008A1
Application number: PCT/JP2018/043750
Authority: WO
Inventors: 彰太荒井
Original assignee: 日東工器株式会社
Priority date: 2017-12-18
Filing date: 2018-11-28
Publication date: 2019-06-27
Also published as: JPWO2019124008A1; JP6654269B2; CN111479655B; CN111479655A; TWI699634B; TW201935158A

Abstract

[Problem] To set whether to output a pass signal on an electric driver side, and to enable only a necessary pass signal to be output. [Solution] This control circuit 128 of an electric driver 100 has: a memory 132 which stores setting data; and a calculation unit 131 which controls the electric driver 100 on the basis of the setting data. The setting data includes: a pass criterion value which indicates a pass criterion for an operation of a tool in each work process; and a pass signal output setting value for setting, for each work process, whether to output the pass signal when the pass criterion is satisfied in each work process. The calculation unit 131 outputs the pass signal when the pass criterion is satisfied and the pass signal output setting value corresponding to the work process at that time is a setting value at which the pass signal is to be output, and does not output the pass signal when the pass signal output setting value is a setting value at which the pass signal is not to be output.

Description

Tool and tool control circuit and control method

The present invention relates to a control circuit for a tool that operates while sequentially changing control conditions for each work process, a tool including such a control circuit, and a control method of the tool.

For example, Patent Document 1 discloses an electric driver in which a driver bit is rotationally driven by an electric motor to perform a screw tightening operation. In such an electric driver, generally, the user can change settings such as the rotation speed and the tightening torque of the electric motor in accordance with the type of screw and the member to which the screw is to be tightened. In addition, in the factory production line, different types of screws may be tightened in sequence in a predetermined order, and in the case of an electric driver used in such a case, one operation process is completed and the next operation is completed. When moving to the work process, the setting of the motor-driven driver is automatically changed to the control conditions required in the work process. In addition, a pass standard is set in advance for each work process, and when the operation of the motor-driven driver in each work process satisfies this pass standard, a pass signal is also output to an external device. It has become.

The electric driver as described above may be connected to an external device such as a programmable logic controller (PLC), and the external device may perform various operations based on a pass signal transmitted from the electric driver. As such an operation, for example, there is an operation of closing the lid of the container containing the screw used in the finished work step and opening the lid of the container containing the screw used in the next work step .

International Publication No. 2017/170648

In the conventional electric driver described above, when the acceptance criteria are satisfied in each operation process, an acceptance signal is output every time each operation process is completed, or all the operation processes satisfy the acceptance criteria If it was the last one pass only once, you could only choose either. However, in an external device that receives a pass signal, a predetermined operation is performed only when a specific operation step in the series of operation steps is completed, and no operation is performed when another operation step is completed. There is also. As such a case, for example, it is conceivable that temporary tightening of a screw is performed in a certain operation process, and final tightening of the screw is performed in the next operation process, and then another operation process is continued. In this case, since tightening of the screw is first completed by performing two operation steps, there is a case where the external device does not perform any operation even if a pass signal is received when the first operation step is completed. In this case, the external device needs to be preset to handle the first pass signal as unnecessary. That is, in an external device connected to a conventional motor-driven driver to which a pass signal is sent at the completion of all work steps, it is not necessary to make settings so as to ignore unnecessary pass signals. It becomes complicated.

Therefore, the present invention is a control circuit in a tool that operates while sequentially changing control conditions for each work process, and sets the presence or absence of an output of a pass signal on the side of the tool and outputs only a necessary pass signal. It is an object to provide a control circuit that makes it possible. Another object of the present invention is to provide a tool having such a control circuit and a control method of the tool.

That is, the present invention
A control circuit of a tool that operates while sequentially changing control conditions for each work process,
An information storage unit in which setting data for setting control conditions in each work process is stored;
An operation unit that sequentially changes the control conditions of the tool for each work process based on the setting data;
Equipped with
The setting data includes a pass reference value indicating pass criteria for the operation of the tool in each work step, and whether or not to output a pass signal when the pass criterion is satisfied in each work step, for each work step Contains a pass signal output set value for setting
The operation unit determines whether or not the operation of the tool in each operation process satisfies the acceptance criterion based on the acceptance criterion value, and fulfills the acceptance criterion and outputs an acceptance signal corresponding to the operation process at that time. When the set value is a set value for outputting the pass signal, the pass signal is output, and when the set value for the pass signal output is a set value not to output the pass signal, the pass signal is not output. Provide a control circuit.

In the control circuit, since it is possible to set the presence or absence of the output of the pass signal for each work process based on the pass signal output setting value, the pass signal which is not required in the connected external device is transmitted. It will be possible not to As a result, the external device need not be set to ignore unnecessary pass signals, and the setting of the external device can be simplified.

Preferably, the computing unit may output a rejection signal when it is determined that the operation of the tool does not meet the pass criteria in the current operation process.

The present invention also provides a tool including the above-described control circuit, which is operated while sequentially changing control conditions for each work process.

Furthermore, the present invention
A control method of a tool which operates while sequentially changing control conditions for each work process,
Reading setting data stored in the information storage unit;
Sequentially changing the control condition of the tool in each work process based on the setting data;
Determining whether the operation of the tool in each work process satisfies the pass standard in each work process indicated by the pass reference value included in the setting data;
When the acceptance criteria is satisfied and the acceptance signal output setting value corresponding to the work process at that time is the setting value for outputting the acceptance signal, the acceptance signal is output to the outside, and the acceptance signal output setting value is the acceptance signal A step of preventing the output of the pass signal to the outside when the set value is not output;
Provide a control method including:

Hereinafter, an embodiment of a tool concerning the present invention is described based on an accompanying drawing.

FIG. 1 is an external view of an electric driver according to a first embodiment of the present invention. It is a functional block diagram of the electric driver of FIG. It is a figure which shows the condition setting data preserve | saved at memory. It is a figure which shows the order setting data preserve | saved at memory. It is an external view of the electric driver concerning a 2nd embodiment of the present invention. It is a functional block diagram of the electric driver of FIG.

As shown in FIGS. 1 and 2, the electric driver (tool) 100 according to the first embodiment of the present invention is rotated by the tool housing 110, the electric motor 112 built in the tool housing 110, and the electric motor 112. And a driven bit holder 114. In the bit holder 114, a driver bit 116 appropriately selected according to a target screw is removably attached. The tool housing 110 is provided with an input interface 122 having a display unit 118 and an input button 120, and a connection cable 124 for connecting the motor-driven driver 100 to a programmable logic controller (PLC) 123. Further, in the tool housing 110, a motor drive circuit 126 for controlling the drive of the electric motor 112, a control circuit 128 for controlling the entire electric driver 100, and a rotational position of the rotor of the electric motor 112 are detected. Hall sensors 130 are provided. The control circuit 128 includes an arithmetic unit 131 and a memory (information storage unit) 132 in which setting data is stored. The calculation unit 131 controls the motor-driven driver 100 based on the setting data stored in the memory 132.

The setting data stored in the memory 132 includes condition setting data for setting control conditions in each work process. As shown in FIG. 3, the memory 132 of the motor-driven driver 100 can store first to thirtieth condition setting data corresponding to the first to twentieth work processes. The condition setting data includes setting values indicating the tightening torque and the number of tightening screws in the screw tightening operation. Besides these, for example, setting values for controlling the rotational speed of the electric motor 112 can also be included. The condition setting data in the motor-driven driver 100 further includes a pass reference value indicating a pass standard for the operation of the motor-driven driver 100 in each work process. In the motor-driven driver 100, set values for setting the minimum rotation time and the maximum rotation time of the electric motor 112 when the screw tightening operation is performed are included as the pass reference values. For example, when the rotation of the electric motor 112 is stopped in a time shorter than the minimum rotation time, it is expected that the head of the screw is seated earlier than the expected time, and the electric motor 112 in the time longer than the maximum rotation time. It is expected that when the rotation has stopped the screw head has been seated later than expected. That is, when the electric motor 112 is stopped earlier than the minimum rotation time or later than the maximum rotation time, it can be determined that there is a high possibility that the wrong screw is selected and screwing is performed. When it is determined that the operation of the motor-driven driver 100 does not meet the acceptance criteria, the computing unit 131 temporarily stops the operation of the motor-driven driver 100 and outputs a rejection signal to the PLC 123. The condition setting data further includes a pass signal output setting value for setting whether or not to output a pass signal to the outside when the pass criteria are satisfied. The calculation unit 131 can output a pass signal when it is determined that the operation of a certain work process satisfies the pass criteria, but whether to output a pass signal depends on the pass signal output setting value It is determined. That is, if the pass signal output setting value is a setting value (ON) for outputting a pass signal, the pass signal is output to the PLC 123, and if it is a setting value (OFF) for not outputting a pass signal, the pass signal is It does not output to PLC123. These setting values in the condition setting data are respectively set to appropriate values in accordance with the corresponding work process. The above-described setting items in the condition setting data are illustrated as an example, and may be other items in accordance with the assumed work process.

The setting data further includes a plurality of order setting data for setting the execution order of the work process. As shown in FIG. 4, the first to thirtieth execution orders can be set in the memory 132 of the motor-driven driver 100, and data indicating each execution order is stored in the memory 132 as order setting data. There is. Up to eight work processes can be registered in each order setting data. The order setting data further includes a next operation setting value for setting the next operation after the series of work processes are completed. In the electric driver 100, as the next operation setting value, a setting value (termination) for stopping the operation of the electric driver 100, a setting value (loop) for re-executing a series of work processes in the same execution order, and It is possible to select from setting values (transition to another execution order) to shift to a series of work processes in the execution order based on the order setting data.

The above-mentioned condition setting data and order setting data included in the setting data can be arbitrarily changed by the operation of the input interface 122. Alternatively, setting data can be rewritten by transmitting corresponding data from an external device such as a personal computer.

When the motor-driven driver 100 is activated and predetermined initial setting is completed, the calculation unit 131 reads necessary setting data from the memory 132. Which one of the plurality of execution orders is to be executed can be arbitrarily selected, and is usually specified in advance. The arithmetic unit 131 reads predetermined order setting data corresponding to the specified execution order, and sets the execution order of the work process. For example, when the first execution order is specified, the first order setting data is read, and as shown in FIG. 4, the first operation process, the second operation process, the third operation process, and the fourth operation process Are set as a series of work processes, and these work processes will be sequentially performed. The calculation unit 131 operates the electric driver 100 while sequentially changing the control conditions for each work process based on the first to fourth condition setting data respectively corresponding to the work processes. In the present embodiment, the first work process assumes that four screws are temporarily tightened, and the second work process assumes that the temporarily tightened screws are completely tightened. . Therefore, when the first work process is normally completed, the four screws are screwed in with their heads not seated, and in the second work process, these temporarily tightened screws are further screwed to seat the screw heads. Further tightening is performed with a predetermined tightening torque. As a result, the four screws are completely tightened. Since the pass signal output setting value of the first condition setting data is “OFF”, the computing unit 131 does not output a pass signal even if the first work process is normally completed and the pass criteria are satisfied. On the other hand, since the pass signal output setting value of the second condition setting data is "ON", the computing unit 131 outputs a pass signal when the second operation process is normally completed and the pass criteria are satisfied. Similarly, in the third operation process, eight screws are temporarily tightened, and in the fourth operation process, the temporarily tightened eight screws are fully tightened, and when the fourth operation process is normally completed. A pass signal is output. Since the next operation setting value in the first order setting data is “end”, the operation of the electric driver 100 is stopped when the fourth operation process is completed.

As described above, the pass signal is not output at the completion of the first and third working steps which are the temporary tightening step, but is output only when the second and fourth working steps which are the final tightening step are completed. , PLC 123 will only receive a pass signal when screw tightening is complete. The PLC 123 controls the operation of the other peripheral devices etc. in conjunction with the operation of the electric driver 100, but does not necessarily perform some control every time each work process is completed, and a predetermined work process Control is often performed only when it is completed. In the conventional motor-driven driver 100, a pass signal is outputted every time each work process is completed, and therefore, it is necessary to set the PLC 123 side so as to ignore an unnecessary pass signal. On the other hand, since it is possible to prevent the electric driver 100 from outputting an unnecessary pass signal, it is possible to eliminate the setting for ignoring the pass signal on the PLC 123 side. Also, for example, in the case where a screw retightening step is newly added after the above-described second work step, the first four screwings should be completed by completing all of the first to third work steps. Therefore, if the pass signal output setting value at the completion of the second operation process is set to “OFF” and the pass signal output setting value at the completion of the new third operation process (additional tightening process) is “ON”, There is no setting change on the PLC 123 side due to the change of the work process.

When the second execution order is specified, the second order setting data is read, and the third operation process, the 30th operation process, and the 7th operation process are set as a series of operation processes, for each operation process. The electric driver 100 operates while sequentially changing the control conditions. Since the next operation setting value in the second order setting data is "loop", when the seventh operation process which is the last operation process is completed, the process returns to the third operation process which is the first operation process, and so on. The work process will be repeated.

When the third execution order is specified, the third order setting data is read, and eight operation steps from the first first operation step to the last thirteenth operation step are set as a series of operation steps. The electric driver 100 operates while sequentially changing the control conditions for each work process. Since the next operation setting value in the third order setting data is "transition to the fourth execution order", when the final thirteenth working process is completed, the designated fourth order setting data is read and the fourth execution order Are set, and the process shifts to a series of work steps in the fourth execution order. When the motor-driven driver 100 continues the operation based on the series of work processes in the fourth execution order, and the eleventh work process, which is the last work process in the fourth execution order, is completed, When the next operation setting value is "end", the operation of the motor-driven driver 100 is stopped.

Thus, in the motor-driven driver 100, the next operation after completion of a series of work steps based on certain order setting data can be selected from "end", "loop", and "transition to another execution order". There is. In particular, since it is possible to shift to an execution order based on another order setting data, the electric driver 100 itself sets a work process in a more complicated execution order without depending on control of an external device such as the PLC 123. It is possible to In addition, if the basic execution order that is often used is set in each order setting data, setting the execution order to be shifted appropriately as compared with the case where the execution order is reassembled from the beginning Thus, process changes can be made more quickly and easily. It is not necessary to necessarily include the above-described three as the selectable next operation, and may include another next operation instead or additionally.

The motor-driven driver 100 is further configured to store in the memory 132 a history of work processes executed across a plurality of execution orders based on a plurality of order setting data. Due to some work errors, it may be necessary to redo the work process or, in some cases, to start from the previous work process. In that case, based on the history of the work process stored in the memory 132, it is possible to return to the work process that needs to be redone. Specifically, by operating the input button 120 of the input interface 122, it is possible to return to the previous work process remaining in the history. By the operation of the input button 120, only one operation in the current process is returned, the operation is returned to the previous operation, the operation is returned to the last operation in the previous order setting data execution sequence, or It is possible to return to the first work process in the execution order of the previous order setting data. The memory 132 in the motor-driven driver 100 is a combination of a readable and writable non-volatile memory and a volatile memory such as a cache memory for temporarily storing data necessary for the program operation. The setting data is stored in the non-volatile memory, and the work process history is stored in the volatile memory.

An electric driver 200 according to a second embodiment of the present invention includes an electric driver main body 202 and a controller 204 for controlling the electric driver main body 202, as shown in FIGS. The motor-driven driver main body 202 and the controller 204 are connected by a communication cable 206 via

communication units

238 a and 238 b respectively provided. A communication cable 224 connected to the PLC 223 is provided on the controller 204 side. In the tool housing 210 of the electric driver main body 202, an electric motor 212, a motor drive circuit 226, and a hall sensor 230 similar to the electric driver 100 according to the first embodiment are provided. The input interface 222 is provided on the controller 204 side.

In the electric driver 200, calculation units 231a and 231b are provided in the electric driver main body 202 and the controller 204, respectively. The two arithmetic units 231a and 231b communicate with each other via the communication cable 206, and the two arithmetic units 231a and 231b perform the same function as the arithmetic unit 131 in the first embodiment. Similarly, memories 232a and 232b are respectively provided in the motor-driven driver main body 202 and the controller 204, and these two memories 232a and 232b perform the same function as the memory 132 in the first embodiment. That is, in the motor-driven driver, the control circuit 228 is dispersedly disposed in the motor-driven driver main body 202 and the controller 204.

In the embodiment, the arithmetic units 231a and 231b and the memories 232a and 232b are disposed in a distributed manner in the motor driver 202 and the controller 204, respectively. Or the entire control circuit 228 may be located on the side of the controller 204.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, in the above embodiment, the tool according to the present invention is described as an example of the electric driver which is a kind of electric tool, but other electric tools such as a torque wrench and a grinder can also be used. It is also possible to use other power tools such as an air tool that uses an air motor instead of an electric motor as a power source while having a control circuit such as the above. The tool according to the invention can also be a hand tool without power. As such a hand tool, for example, there is a torque wrench having a torque detection function. In the torque wrench, setting data including condition setting data including the number of times of tightening (control condition) of a nut, a bolt or the like for each work process and a torque reference value (acceptance standard) at the time of tightening operation When the clamping operation is performed for the predetermined number of tightenings set in the work process, the operation unit of the control circuit moves to the next work process and the control condition is changed based on the setting data. The control circuit also compares the torque value detected by the torque sensor during the tightening operation with the torque reference value to determine whether the tightening operation is accepted. As in the above embodiment, the condition setting data includes a pass signal output setting value, and the work process whether or not to output a pass signal when the tightening operation satisfies the torque reference value (pass criteria). It can be set arbitrarily for each. Similarly, based on the order setting data and the next operation setting value, it is possible to select the next operation after the series of work steps set by the order setting data is completed.

Further, the tool of the present invention can be connected to other external devices such as a personal computer other than the PLC, and the pass signal and the fail signal can be transmitted wirelessly. Furthermore, besides the above-mentioned built-in semiconductor memory as an information storage unit for storing setting data, other devices such as a hard disk drive, a recordable medium such as a writable CD or DVD, a removable USB memory, etc. Alternatively, any combination of these may be used.

100 electric driver (tool)
DESCRIPTION OF SYMBOLS 110 Tool housing 112 Electric motor 114 Bit holder 116 Driver bit 118 Display part 120 Input button 122 Input interface 123 Programmable logic controller (PLC)
124 connection cable 126 motor drive circuit 128 control circuit 130 hall sensor 131 operation unit 132 memory (information storage unit)
200 electric driver 202 electric driver main body 204 controller 206 communication cable 210 tool housing 212 electric motor 222 input interface 224 communication cable 226 motor drive circuit 228 control circuit 230 hall sensor 231a arithmetic unit 231b arithmetic unit 232a memory 232b memory 238a communication unit 238b communication unit

Claims

A control circuit of a tool that operates while sequentially changing control conditions for each work process,
An information storage unit in which setting data for setting control conditions in each work process is stored;
An operation unit that sequentially changes the control conditions of the tool for each work process based on the setting data;
Equipped with
The setting data includes a pass reference value indicating pass criteria for the operation of the tool in each work step, and whether or not to output a pass signal when the pass criterion is satisfied in each work step, for each work step Contains a pass signal output set value for setting
The operation unit determines whether or not the operation of the tool in each operation process satisfies the acceptance criterion based on the acceptance criterion value, and fulfills the acceptance criterion and outputs an acceptance signal corresponding to the operation process at that time. When the set value is a set value for outputting the pass signal, the pass signal is output, and when the set value for the pass signal output is a set value not to output the pass signal, the pass signal is not output. Control circuit.
The control circuit according to claim 1, wherein the arithmetic unit is configured to output a rejection signal when it is determined that the operation of the tool does not meet the acceptance criteria in the current operation process.
A tool comprising the control circuit according to claim 1 or 2, wherein the control circuit is operated while sequentially changing control conditions for each work process.
A control method of a power tool which operates while sequentially changing control conditions for each work process,
Reading setting data stored in the information storage unit;
Sequentially changing the control condition of the tool in each work process based on the setting data;
Determining whether the operation of the tool in each work process satisfies the pass standard in each work process indicated by the pass reference value included in the setting data;
When the acceptance criteria is satisfied and the acceptance signal output setting value corresponding to the work process at that time is the setting value for outputting the acceptance signal, the acceptance signal is output to the outside, and the acceptance signal output setting value is the acceptance signal A step of preventing the output of the pass signal to the outside when the set value is not output;
Control method including: