JP7029558B1 - Machine tool and machine tool equipment that can be attached to and detached from the machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a machine tool device which can be attached to and detached from a machine tool such as a machine tool camera. A machine tool has a first connector having a function of a power terminal and a communication terminal, and has a power feeding device to which a tool can be attached and a second connector to be connected to the first connector. It is removable and includes a power receiving device that receives power from the power feeding device and a control unit that controls the power supply from the power feeding device to the power receiving device. After (i) the first connector and the second connector are connected, (ii) the response of the power receiving device to a small amount of power is detected, and then (iii) power is supplied. [Selection diagram] FIG. 4

Description

The present invention relates to a machine tool device that can be attached to and detached from a machine tool.

Machine tools include a machine that attaches tools to the spindle and processes workpieces, a machine that attaches multiple tools to turrets and rotates the workpiece, and an additional processing machine that processes materials while melting them with a laser. There is a multi-tasking machine equipped.

In recent years, not only machining, but also the functions that can be executed by the machine tool, such as attaching a camera to the machine tool and observing the workpiece, are increasing. In order to realize these functions, a machine tool device that can be attached to and detached from a machine tool has been developed (Patent Document 1).

Japanese Patent No. 6656707

Patent Document 1 discloses a machine tool camera as a machine tool device that can be attached to and detached from a machine tool. In Patent Document 1, since there is no power supply for supplying electric power to the mounting portion for attaching the tool of the machine tool, a battery is built in the camera for the machine tool. Therefore, the size of the camera for machine tools tends to increase.

Further, in order to perform more precise measurement than observation, it is conceivable to increase the size of one imaging data or increase the number of imagings. However, in order to satisfy sufficient imaging conditions for measurement, it is necessary to drive the camera for a long time, and for that purpose, it is necessary to mount a large capacity battery. From this point of view, it is difficult to miniaturize the machine tool camera.

In addition, the reason why the battery method is not suitable is that it is necessary to manage the remaining amount of the finite battery, assuming continuous automatic operation. Sometimes the battery may run out when you want to use it.

Therefore, the present invention provides the apparatus and the like according to the claims.

According to the present invention, it is possible to miniaturize a machine tool device that can be attached to and detached from a machine tool such as a machine tool camera.

It is a perspective view of an example of the machine tool apparatus which can be attached to and detached from a machine tool. It is a perspective view which shows the state of connection of a 1st connector and a 2nd connector. It is sectional drawing of the device for a machine tool (as an example, a power receiving device (PD)). It is an overall block diagram of a work system. It is a time sequence diagram when PD verification is successful. It is a start sequence diagram of PoE (Power Over Ethernet). It is a time sequence diagram when PD verification fails.

Hereinafter, the machine tool device and the machine tool that can be attached to and detached from the machine tool according to the embodiment will be described with reference to the drawings. In the following description, the same configuration will be described with the same reference numerals.

≪Machine tool≫
In this embodiment, in the process of machining based on the NC (Numerical Control) program, when the tool is changed based on the NC program, the tool to be used next is used by the tool changer (ATC (Automatic Train Control)). A machine tool capable of automatically attaching a tool to a machine tool mounting portion (for example, spindle, turret) will be described.

In this embodiment, a machine tool device that can be attached to and detached from a machine tool can be automatically attached to and detached from a machine tool mounting portion by a tool changing device. The machine tool of the present embodiment is an example, and is not limited to the above-mentioned configuration.

≪Machine tool equipment≫
Machine tool devices that can be attached to and detached from machine tools include, for example, power receiving devices, cameras (or imaging units), touch probes, laser scanners, angle heads, tools with angle heads, power tools, functional tools, and ultrasonic generators. There are laser oscillators and the like.
Of course, a tool for a general machine tool such as a drill can also be attached to the attachment portion of the machine tool in the present embodiment.

(Example of power receiving device machine tool device)
A power receiving device, which is an example of a machine tool device, has an in-device module driven by electric power. In-device modules include, for example, cameras, various sensors such as temperature sensors and piezoelectric sensors, and electrical components such as oscillators such as laser oscillators and millimeter wave oscillators. Also, another example of an in-device module is a mechanical component such as an actuator or a motor. Further, as an example of the module in the device, a circuit such as an LSI (Large Scale Integration) or a CPU (Central Processing Unit) may be used. As will be described later in connection with FIGS. 1 to 3, the in-device module is connected to a wiring (cable) for supplying electric power from the second connector, and a predetermined function is driven by the supplied electric power. This is an example of a functional part. The in-device module operates based on the power supplied from the power feeding device through predetermined negotiation, as described in connection with FIGS. 5 and 6.

When using a power receiving device, it is necessary to supply power to the power-driven in-device module. When the power receiving device has a camera, the camera has an image sensor (for example, CMOS (Complementary MOS)) and an electric circuit for CMOS control as an in-device module. That is, the CMOS in the camera and the electric circuit operate based on the electric power supplied from the outside. The electric power supplied from the outside is preferably supplied by using a technology (PoE technology) for transmitting data and electric power through a cable used for Ethernet wiring. Therefore, the power receiving device has a module that can identify the power line and the communication line. Imaging with a camera is performed by receiving an operation instruction for imaging transmitted from the cable described above by a CPU, which is an electric circuit, and transmitting a charge transmission control signal from the CPU to CMOS, which is an image sensor. The captured image data is transmitted to the outside of the machine tool device (for example, an NC device inside the machine tool or another device outside the machine tool) via the cable described above.

By using the above-mentioned PoE technology for the machine tool device that can be attached to and detached from the machine tool, it is possible to make the device smaller than the machine tool device with a built-in battery or the wireless power supply type machine tool device described later. Become. As the size of the machine tool device increases, there is a high possibility that interference will occur in the machine tool. Therefore, if the machine tool can be miniaturized, it is preferable to miniaturize it.

Further, by using the above-mentioned PoE (Power Over Ethernet) technology (data communication is performed via a wired cable) for the machine tool device that can be attached to and detached from the machine tool, the communication is more stable than the wireless communication described later. ..

(Reference configuration of machine tool equipment (battery method, wireless method, wireless communication method)
The differences from other configurations will be described below.
First, a method of supplying electric power by providing a battery inside a machine tool device and storing the battery will be described. With such a built-in battery system, it is not necessary to provide an electrical contact between the machine tool and the machine tool device. However, since the battery is built-in, the machine tool device itself becomes large. In addition, since it does not operate when the battery runs out, there is a limit to the operating time of the machine tool device. In the case of the built-in battery method, it is difficult to achieve both miniaturization and high performance.

Next, a method of supplying power wirelessly using electromagnetic induction will be described. With the wireless power transfer method, it is not necessary to provide a machine contact for power supply between the machine tool and the machine tool device. However, it is necessary to provide a coil on both the machine tool and the machine tool device, and in order to obtain sufficient electric power, the occupied volume of the coil becomes large, and the machine tool device may become large.

Further, a wireless communication method using Wi-Fi (registered trademark) will be described. Wi-Fi is an example of a wireless LAN. In Wi-Fi, it takes time to establish a wireless communication path between a machine tool machine and a device that communicates with the machine tool. In addition, there is a risk of interference with other Wi-Fi devices and an influence on radio waves due to obstacles. Further, transmission / reception may be delayed due to radio wave congestion or the like, and the real-time property of communication when operating the machine tool device from the outside is deteriorated.

As described above, by connecting the machine tool and the machine tool device using PoE technology, the machine tool device can be miniaturized.
Based on these, an example of connecting a machine tool and a machine tool device by using PoE technology will be described below using a power receiving device which is an example of the machine tool device.

[Embodiment]
FIG. 1 is a perspective view of a power receiving device (PD: Powered Device) 10 which is an example of a machine tool device attached to a machine tool mounting portion.
In this embodiment, a machining center will be described as an example of a machine tool. The power receiving device 10 is mounted on the spindle 20 of the machining center and used. The spindle 20 is an example of a mounting portion on which the power receiving device 10 and other tools are mounted. The machine tool may be a turning center. In that case, the power receiving device 10 is attached to the turret and used. The turret is an example of a mounting portion on which the power receiving device 10 and other tools are mounted.

The power receiving device 10 is provided in the shank 11 that joins and rotates the spindle 20, the fixed unit 13 that is fixed to the spindle 20, the camera unit 15 that has a built-in camera and rotates integrally with the shank 11, and the fixed unit 13. It has a second connector 14. A first connector 24 is installed on the spindle 20 of the machine tool. The second connector 14 and the first connector 24 are in opposite positions. The second connector 14 and the first connector 24 are connected to each other with the power receiving device 10 mounted on the spindle 20. The power supply equipment (PSE: Power Sourcing Equipment) 22 of the present embodiment provided in the machine tool has a spindle 20 and a first connector 24. The power receiving device 10 of the present embodiment is a PoE compatible device, and power is supplied and data communication is performed via the first connector 24 and the second connector 14. Therefore, the power receiving device 10 is provided with a PoE module (power receiving module) for separately transmitting the electricity transmitted from the first connector 24 to the second connector 14 into electric power and communication. Both the first connector 24 and the second connector 14 have the functions of a power terminal and a communication terminal. The fixing unit 13 has a second connector 14, and when it is attached to the main shaft 20 (example of the mounting portion), the second connector 14 is connected to the first connector 24 and is attached to the main shaft 20 (example of the mounting portion). This is an example of a fixed part to be fixed. The spindle 20 referred to here refers to a device including a rotating portion and a non-rotating portion. The fixed unit 13 is fixed to the non-rotating portion and does not rotate.

FIG. 2 is a perspective view showing a state of connection of connectors.
The first connector 24 on the machine tool side is also shown. The second connector 14 and the first connector 24 are connectors for Ethernet, for example, and use a spring connector. Further, a mechanism described later may be realized by using a contact connector having the same function as the spring connector. Contact parts are not limited to this example.

The second connector 14 of the present embodiment is a male connector having eight contact pins (FIG. 2). The first connector 24 is a female connector having eight contact holes. When the power receiving device 10 is brought closer to the spindle 20 by the tool changer, the second connector 14 and the first connector 24 approach each other so that the contact pins fit into the contact holes. When the power receiving device 10 is mounted on the spindle 20, the second connector 14 and the first connector 24 are connected to each other. Here, an example of an 8-pin connector is shown, but a connector having 9 or more pins may be used, or a connector having 7 or less pins may be used. Since Ethernet communication and PoE can be realized with a minimum of 4 wires, a connector with 4 or more pins can be adopted. For example, a 4-pin connector may be used.

If the first connector 24 on the machine tool side is a female connector, foreign matter such as gold scraps is less likely to be caught. However, the relationship between male and female may be reversed. That is, the second connector 14 may be a female connector having eight contact holes, and the first connector 24 may be a male connector having eight contact pins. The contact pins and contact holes have the functions of a power terminal and a communication terminal.

The positioning portion 16 of the cylindrical power receiving device 10 on the side of the second connector 14 fits into the cylindrical cavity on the machine tool side, serves as a guide at the time of mounting, and fixes the power receiving device 10. The shank 11 of the power receiving device 10 and the camera unit 15 can be rotated by the rotational power of the spindle 20. On the other hand, the fixed unit 13 having the positioning portion 16 is fixed to the main shaft 20 and does not rotate.

FIG. 3 is a cross-sectional view of a power receiving device 10 which is an example of a machine tool device.
The power receiving device 10 of the present embodiment is one of various power receiving devices. The power receiving device 10 of the present embodiment includes a shank 11, a fixed unit 13, and a camera unit 15. The bearing 17 of the fixing unit 13 supports the shank 11 in a rotatable state. The shank 11 is joined to the camera unit 15, and the camera unit 15 rotates integrally with the shank 11. The bearing 18 of the fixed unit 13 supports the camera unit 15 in a rotatable state. The power receiving device 10 of the present embodiment is provided with an electric circuit area 28. In the present embodiment, the second connector 14 and the circuit board which is the electric circuit area 28 are connected by the cable 26 of Ethernet. The Ethernet cable 26 is an example of wiring for connecting a functional unit whose predetermined function is driven by the supplied electric power and the second connector 14. A contact corresponding to rotation, such as a rotation mechanism (slip ring), may be sandwiched in a part of the wiring by the cable 26. Alternatively, a spindle (swirl cable housing) may be provided to cope with rotation. The electric circuit area 28 may include a power receiving circuit, a drive control electric circuit for controlling a power drive device, and the like. Further, a CPU, an LSI, or the like may be mounted in the electric circuit area 28. Further, the electric circuit area 28 may be provided at a plurality of places instead of one place. The power receiving circuit supplies the received power to a power driving device, an electric circuit for drive control, and the like.

In this way, when the power receiving device 10 is mounted on the spindle 20 and the second connector 14 of the power receiving device 10 is connected and connected to the first connector 24 of the machine tool, the power feeding device 22 is connected to the power receiving device 10 via these connectors. Power is supplied, and communication is performed between the power feeding device 22 and the power receiving device 10. It is preferable to use Ethernet PoE technology for the processing operation of the power feeding device 22 and the power receiving device 10.

FIG. 4 is an example of an overall configuration diagram of the work system.
The machine tool includes the machine tool 90 and the power receiving device 10 described above. The machine tool 90 includes a spindle 20, a tool changer 50, a PLC (Programmable Logic Controller) 60, a cleaning unit 70, and an NC device 80. The control device 40 and the power supply 30 may be provided inside the machine tool 90 or may be provided outside the machine tool 90.

(Power receiving device 10 and power feeding device 22)
According to the PoE standard of Ethernet, the power receiving device 10 receives power from the power feeding device 22. The power feeding device 22 of the present embodiment includes a first connector 24 and a spindle 20. Of course, it is not limited to this configuration. For example, in the case of a turning center, the power feeding device 22 has a configuration including a first connector 24 and a turret. The power feeding device 22 and the power receiving device 10 also have an Ethernet communication function. The power feeding device 22 has a function of detecting the power receiving device 10 in the activation sequence as described later.

(NC device 80)
The NC device 80 of the machine tool 90 executes the NC program and operates the machining unit of the machine tool 90 according to the code specified by the NC program. When the NC device 80 executes the cleaning code included in the NC program, it issues a cleaning command to the PLC 60. Further, when the NC device 80 executes the tool change code included in the NC program, it issues a tool change command to the PLC 60. When the PLC 60 receives a cleaning command, the cleaning unit 70 is controlled according to the command to clean the inside of the machine tool 90. When the PLC 60 receives a tool change command, the tool changer 50 is controlled according to the command to exchange the tool stored in the tool magazine of the tool changer 50 with the tool mounted on the spindle 20.

(Control device 40)
The control device 40 (FIG. 4) activates the power supply module 221 in the power supply device 22, and also responds to the success or failure of PD detection (response and reaction that the power receiving device 10 is a device compatible with PoE) in the activation sequence. It also controls. As the power supply module 221, a PoE switch, a PoE injector, or the like may be used.
The control device 40 may be an operation panel incorporating a computer provided in the machine tool 90, or may be a computer other than the operation panel.
By the action of the control device 40, negotiation is performed between the power feeding device 22 and the power receiving device 10, and the power feeding environment and the communication environment in the work system are prepared. In the negotiation, it is confirmed that the power feeding device 22 is the power receiving device 10 compatible with PoE, and if the confirmation is obtained, the power supply and the communication are started. The power feeding device 22 sends the electric power obtained from the power source 30 to the power receiving device 10. Further, the power feeding device 22 and the power receiving device 10 establish a physical layer and a data link layer of the OSI reference model.

The control device 40 may implement the functions of the network layer, the transport layer, and the session layer above the data link layer. The control device 40 may further implement the functions of the presentation layer and the application layer. As a result, the application of the control device 40 may communicate with the electric circuit for drive control of the power receiving device 10 and the application layer via the power feeding device 22. In other words, if the function realized by the application of the control device 40 and the power receiving device 10 is positioned as the power receiving device IT service, the control device 40 operates as the master of the power receiving device IT service, and the power receiving device 10 is the power receiving device. It will operate as an agent for IT services.

In the present embodiment, it is necessary to start the power feeding device 22 (power feeding module 221) at the timing when the power receiving device 10 is mounted on the spindle 20 (mounting portion). Therefore, the control device 40 needs to acquire a command to attach the power receiving device 10 to the spindle 20. The control device 40 of the present embodiment performs a process of acquiring a command code related to tool change of an NC program from an NC device 80 or a PLC 60. The power receiving device 10 of the present embodiment has a shank 11 that can be attached to and detached from the spindle 20 like other tools, and can be attached to the spindle 20 by using a tool replacement command code (M6). ..

The control device 40 is an example of a control unit, and controls the power supply from the power supply device 22 to the power receiving device 10. Specifically, in the control device 40, after the power receiving device 10 is attached to the power feeding device and the first connector 24 and the second connector 14 are connected, the power receiving device 22 sends the first power to the power receiving device 10 (in FIG. 6). A second power (described later in relation to FIG. 6), which is larger than the first power, is supplied by supplying a weak power (described later), detecting a response to the first power of the power receiving device 10, and based on the detected response. (Power required by the power receiving device 10) is controlled to be supplied to the power receiving device 10.

Further, when the PD detection fails in the activation sequence when the power receiving device 10 is mounted, the control device 40 detects foreign matter pinching, performs cleaning for removing foreign matter such as chips, and reattaches the power receiving device 10. To control. That is, the control device 40 may have a role of controlling the recovery operation due to the pinching of foreign matter between the connectors. Therefore, the control device 40 may issue a cleaning instruction and a tool change instruction to the PLC 60. The operation of the PLC 60 when the cleaning instruction and the tool change instruction are received from the control device 40 is the same as the operation when the cleaning instruction and the tool change instruction are received from the NC device 80.

FIG. 5 is a time sequence diagram when PD verification is successful.
(Operation before PD verification in FIG. 5)
When the NC device 80 sends a tool selection command (TXX, "XX": tool number) for moving the power receiving device 10 stored in the tool magazine of the tool changing device 50 to the tool standby position, the NC device 80 sends a tool selection command (TXX, "XX": tool number) to the PLC60. The PLC 60 controls the tool changing device 50 to move the power receiving device 10 to the tool standby position. Here, in the tool selection command, the tool to be used is registered in association with the tool number in advance, but the tool selection command is to input and execute the tool number. In this step, it is assumed that the tool number (T number) is added to the power receiving device 10. For example, when storing the power receiving device 10 in the magazine, the operator registers the power receiving device 10 as T001 and stores the correspondence relationship between the power receiving device 10 and T001 in the NC device 80. Further, the power receiving device 10 of the present embodiment has a shank shape similar to a tool that can be attached to and detached from the spindle 20 at a machining center. Therefore, the operator can handle the power receiving device 10 in the same manner as the tool by using the same command as the tool.

(Sequence of PD verification in FIG. 5)
When the NC device 80 sends a tool change command (for example, M06, a command in which the NC device 80 decodes M06 of the NC program and converts it for the PLC 60) to the PLC 60, the PLC 60 controls the tool change device 50 to the spindle 20. The mounted tool and the power receiving device 10 in the tool standby position are exchanged (S10). In this embodiment, since the image is captured by the power receiving device 10 having a camera after processing, it is described that the power receiving device 10 is replaced with a tool. However, if nothing is attached to the spindle 20, the power receiving device 10 is simply attached to the spindle 20. It becomes an operation.

At this time, the control device 40 traps a set of the tool selection command and the tool change command. The control device 40 determines whether or not the power receiving device 10 is specified by the tool selection command before the tool change command. When a tool or the like other than the power receiving device 10 is specified, the power feeding module 221 is not started. This is because a tool or the like other than the power receiving device 10 is attached. When the power receiving device 10 is specified, that is, when the power receiving device 10 is detected as a mounting target, the power feeding device 22 (power supply module 221) is activated (S14).

The tool changing device 50 mounts the power receiving device 10 on the spindle 20 in the tool changing operation (S16). At this time, the second connector 14 is connected / connected to the first connector 24. That is, the eight contact pins of the second connector 14 enter the respective contact holes of the first connector 24, and the first connector 24 fits into the second connector 14.

The power feeding device 22 performs a detection operation of the power receiving device 10 in the activation sequence (S18). In IEEE802.3af, 802.3at, the power feeding device 22 detects a DC impedance of 25 K ohms as a detection mode, and confirms whether the power receiving device 10 is a PoE compatible power receiving device 10. This is to ensure safety in PoE. The detection mode will be described later in relation to FIG.

When the activation sequence such as PD detection proceeds normally between the power feeding device 22 and the power receiving device 10 and the initialization is successful (S20), the power feeding device 22 transmits a success notification to the control device 40 (S22). .. In the startup sequence, after the PoE negotiation of IEEE802.3af and 802.3at is completed, the Ethernet negotiation of IEEE802.3 is performed. In Ethernet negotiation, the communication speed and communication mode negotiation using link pulse etc. is automatically performed between the PHY (communication circuit that implements the physical layer of the OSI layer model) on the machine tool 90 side and the PHY on the power receiving device 10 side. Do it. This establishes the physical layer and data link layer of the OSI hierarchy model. After that, the transport layer will be improved by the MAC (Media Access Control) controller, and IP communication and upper protocol communication will be possible.

At this stage, the communication environment for supplying electric power to the power receiving device 10 and transmitting data between the control device 40 and the power receiving device 10 is prepared (S24). The cable 26 connecting the control device 40 and the power receiving device 10 has the same quality as the twisted pair cable, and can communicate with the IP protocol. Since four sets of communication paths are secured, if the frequency characteristics of the connector and the cable 26 to be used are good, it is possible to configure an Ethernet link exceeding 1 Gbps. In addition, power supply of about 71 W becomes possible.

Then, the control device 40 controls the power receiving device 10 to carry out a predetermined process. After completing the predetermined process using the power receiving device 10, the tool is replaced with the next tool.

When the NC device 80 sends a tool selection command (TXX, "XX": tool number) for moving the next tool stored in the magazine to the tool standby position, the PLC60 sends the next tool. Move to the tool standby position.

Subsequently, when the NC device 80 sends a tool change command (for example, M06, a command obtained by decoding M06 of the NC program by the NC device 80 and converting it for the PLC 60) to the PLC 60, the PLC 60 sends a tool change command to the tool change device 50. Send (S26).

At this time, the control device 40 traps the tool change command. When the tool change command is detected while the power receiving device 10 is mounted on the spindle 20 (S28), the power feeding device 22 (power supply module 221) is stopped (S30). This tool change command corresponds to a command to remove the power receiving device 10 from the power feeding device 22. As a result, the power feeding device 22 stops energizing and ends the power supply to the power receiving device 10. That is, the second power (power required by the power receiving device 10 described later in relation to FIG. 6) from the power feeding device 22 to the power receiving device 10 is stopped.

The tool changing device 50 removes the power receiving device 10 from the spindle 20 (S32) as a tool changing operation. At this time, the second connector 14 is separated from the first connector 24. That is, the eight contact pins of the second connector 14 come out of the respective contact holes of the first connector 24, and the first connector 24 separates from the second connector 14. That is, after the power supply is stopped, the connection between the first connector 24 and the second connector 14 is terminated. Since power is not supplied, sparks due to contact opening are less likely to occur. In the general use of Ethernet, the connector is not pulled out during operation. Therefore, the sequence of stopping the power supply by PoE before disconnecting the connector is not specified.

FIG. 6 is a PoE activation sequence diagram.
The power feeding device 22 does not send power (does not supply power) when the connected partner device is not the power receiving device 10. This is to prevent devices other than the power receiving device 10 from being damaged.

Specifically, based on the control of the control device 40, in the power feeding device 22, the power receiving device 10 is attached to the power feeding device 22, and after the first connector 24 and the second connector 14 are connected, a weak electric power (a weak power) to be applied at startup is applied. The power receiving device 10 is detected by negotiation by the first power example) (PD detection). Based on the control of the control device 40, the power supply device 22 first applies a voltage of 2.8 to 10 V to identify the presence or absence of the power receiving device 10 having a built-in 25 k ohm detection resistor. The current flowing at this time is 1 mA or less. Based on the control of the control device 40, the power feeding device 22 applies a voltage of 20.5V after it is found that the other device is a PoE compatible power receiving device 10 to obtain the power required by the power receiving device 10. scale.

Based on the control of the control device 40, the power feeding device 22 supplies the required power (example of the second power) to the power receiving device 10 after the power required by the power receiving device 10 is detected. In FIG. 5, the feeding voltage is set to 44V or 57V, and feeding is performed. Further, in the embodiment of FIG. 5, power supply is performed in the range of 15 W to 100 W, and power reception is performed in the range of 12 W to 72 W.

For the detection operation before power supply, the maximum voltage used for detection is limited to 30V and the maximum current is limited to 5mA, as specified in the PSE PI detection mode electrical requirements. Therefore, even if a short circuit occurs due to chips or the like, the amount of electric power is 150 mW or less, so that it is unlikely that heat generation or the like will occur.

If foreign matter such as chips is caught between the connectors, a short circuit current may be detected by connecting the contacts together. If the contacts are not in contact with each other, the open circuit voltage is detected. In these cases, the power feeding device 22 does not supply power. Further, even if the function of the power receiving device 10 does not start normally and the time-out occurs, the power feeding device 22 does not continuously supply power.

FIG. 7 is a time sequence diagram when PD verification fails.
The operations from S40 to S48 are the same as in the case of S10 to S18 shown in FIG.

When an abnormality occurs in the activation sequence and initialization fails (S50), the power supply device 22 transmits a failure notification to the control device 40 (S52). As an example of failure, the short circuit current is detected or the open circuit voltage is detected as described above. Alternatively, it may detect a timeout.

The control device 40 detects the foreign matter pinching by receiving the above-mentioned failure notification, and transmits a cleaning instruction and a reattachment instruction to the PLC 60 (S54). When the PLC 60 receives the cleaning instruction, the cleaning unit 70 is controlled to clean the first connector 24 and the second connector 14. Specifically, a cleaning liquid (for example, coolant or water) is sprayed on the connection position of the connector and its vicinity. Alternatively, air is blown to the connector connection position and its vicinity. By these injections, foreign substances such as chips are removed.

The control device 40 controls the tool changing device 50 while causing the cleaning unit 70 to clean the power receiving device 10 and returns the power receiving device 10 to the tool magazine. Specifically, a tool selection command (TXX, “XX”: tool number) with 00 added as a tool number is sent to the PLC60, and then a tool change command is sent to the PLC60. As a result, the PLC 60 controls the tool changing device 50 to return the power receiving device 10 mounted on the spindle 20 to the tool magazine so that nothing is mounted on the spindle 20. In this way, when the power receiving device 10 is disconnected, foreign matter such as chips is removed by spraying a cleaning liquid or air on the connection position of the connector and its vicinity.

After that, the control device 40 sends the tool change command to the PLC 60 again, and the PLC 60 controls the tool change device 50 to reattach the power receiving device 10 returned to the tool magazine to the spindle 20.

After reattachment, the PSE 22 performs a detection operation of the power receiving device 10 in the activation sequence as in the case of S18 (S62). If the foreign matter is removed, the initialization is successful as in the case of S20 (S64). The operation after S66 is the same as the case of S22 to S32 shown in FIG.

As described above, in the machine tool 90, power transmission and mutual communication can be performed between the power receiving device 10 which is an example of the machine tool device and another device. Therefore, the machine tool device does not need to have a built-in battery by itself and can be miniaturized.

In addition to miniaturization, it is possible to detect chip pinching using the PoE mechanism and provide a contact environment suitable for use in the machine tool 90. Further, by providing a mechanism (or power feeding stop processing) for cutting power according to a advance directive of tool change to the power feeding device 22, the machine tool 90 can safely use the machine tool device.

[Modification example]
Since there are various modifications in addition to the forms described so far, examples will be given regarding the points that other forms may be used.
First, it is not limited to IP communication. All communication using the IEEE802.3 environment (communication using the twisted pair channel) can be used, including fieldbuses such as EtherCAT and Porfinet.

When the power receiving device 10 is reattached, the removed power receiving device 10 may be made to stand by in the middle without being returned to the tool magazine, and may be reattached from the standby place.

As described above, the above-described embodiment and the above-mentioned modification have been described as examples of the techniques disclosed in the present application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate.

The machine tool 90 and other devices of the present disclosure are realized by cooperation with hardware resources such as a processor, a memory, and a program in addition to machine elements.

10 Power receiving device, 11 shank, 13 Fixed unit, 14 2nd connector, 15 Camera unit, 16 Power receiving device positioning part, 17 bearing, 18 bearing, 20 spindle, 22 power supply equipment (PSE), 221 power supply module, 24 1st Connector, 26 cable, 28 electric circuit area, 30 power supply, 40 control device, 50 tool changer, 60 PLC, 70 cleaning unit, 80 NC device, 90 machine tool

Claims (3)

(i) A power receiving device that has a second connector that can be connected to a first connector that has the functions of a power terminal and a communication terminal is removable, and (ii) a tool for processing a workpiece is removable. With possible mounting parts ,
A control unit that controls power supply to the power receiving device while being attached to the mounting unit is provided.
The power receiving device has a power receiving module that separately transmits the power supplied in a state of being attached to the mounting portion into power for feeding and electricity for communication.
The mounting portion can process the work with the tool with the tool attached, and can supply power to the power receiving device with the power receiving device attached.
The control unit (i) supplies the first power to the power receiving device after (i) the power receiving device is attached to the mounting unit and the first connector and the second connector are connected. A machine tool that detects a response of the power receiving device to the first electric power, and (iii) controls to supply a second electric power larger than the first electric power to the power receiving device based on the detected response. A machine tool device that can be attached to and detached from the mounting part of a machine tool that has (i) a first connector that has the functions of a power terminal and a communication terminal, and (ii) a mounting part to which a tool can be attached to machine a workpiece. And
A fixed portion having a second connector having a function of a power terminal and a communication terminal, and the second connector is connected to the first connector and fixed to the mounting portion when the second connector is attached to the mounting portion.
A functional unit in which a predetermined function is driven by electric power transmitted through the fixed unit is provided.
At least one of the fixed portion or the functional portion transmits electricity supplied to the machine tool apparatus separately to power supply and communication electricity with the machine tool apparatus attached to the attachment portion. Has a power receiving module to
After the machine tool device is attached to the mounting portion and the first connector and the second connector are connected, a first power is supplied to the machine tool device via the first connector, and the machine tool is supplied. A second power larger than the first power is supplied to the machine tool device based on the response of the device to the first power, and the functional unit is supplied to the machine tool device via the power receiving module based on the second power. Machine tool equipment that works. When a command to remove the power receiving device from the mounting portion is detected, the power supply of the second power to the power receiving device is stopped, and after the power supply is stopped, the connection between the first connector and the second connector is canceled. The machine tool according to claim 1.

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