JP2016080422A - Pressure measurement device and pressure measurement device system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure measurement device for detecting clogging in an air path for blowing out air and provided on the main shaft of a machine tool in order to clean a tool holder attachable/detachable to and from the main shaft, the one that is designed to be chargeable with electric power without removing a body cover.SOLUTION: A tool holder attachable/detachable to and from the main shaft of a tool machine is had, and a passage is provided in the tool holder and the body in correspondence to a first passage for blowing out air and provided on the main shaft of the tool machine, the pressure of a pressure detection passage therein is detected, and this pressure information and remaining power supply information are transmitted to the outside by wireless. The pressure measurement device presented herein includes a power-receiving unit of a separate type transformer that makes contactless power feeding, a rechargeable power supply, and a charge circuit. When the remaining amount of power supply declines, charging is promoted by alarm indication, etc., and the pressure measurement device body is inserted into a power transmission stand having the power transmission unit of a power-transmittable and contactless power feeding separate type transformer and power is transmitted, whereby the power supply is charged with electricity.SELECTED DRAWING: Figure 2

Description

  In the present invention, when a tool holder holding a machining tool such as a drill is mounted on a spindle of a machine tool, the flange end surface portion of the tool holder that comes into contact with the spindle is cleaned on the spindle side of the machine tool. The present invention relates to a pressure measuring device that detects clogging of an air path that is provided and blows out pressure air.

  In general, a machine tool such as a machining center has a mechanism for holding a machining tool via a tool holder on the inner peripheral surface of a main shaft, and a mechanism that allows the machining tool to be attached and detached to perform desired machining. For example, a necessary tool is selected from a magazine in which a plurality of tools are arranged with an automatic conveying device, and the tool is mounted on a main shaft to perform processing.

  With the introduction of such automatic tools such as an auto tool changer at the machining center, the automation of machining has progressed dramatically, and the frequency of exchanging machining tools to the spindle has increased significantly. It is very important that the flange end face of the tool holder that comes into contact with the spindle during automatic replacement is cleaned with pressure air blown from the spindle side when the machining tool is replaced, so that there is no foreign matter attached. is there.

  If the pressure air flow path provided in the spindle of such a machine tool is clogged or the pressure air supply source is obstructed, the cleaning will not be performed sufficiently and the spindle and machining tool will not be cleaned. There is a possibility that foreign matter exists in the workpiece, and an error occurs in the holding posture dimension of the machining tool, which affects the machining accuracy.

  Conventionally, Patent Document 1 is disclosed as means for detecting clogging of the flow path of the pressure air. There, the pressure or flow rate of the air supplied from the pressure air supply source to the air supply flow path is measured to determine whether or not the machining tool is mounted, and in the state where the shank taper portion of the tool holder is clamped, The pressure or flow rate of air in the injection hole is measured, and the presence or absence of mounting failure is determined by comparing the value with a good mounting state measured in advance.

Japanese Patent No. 4896580

  However, in the case of detecting clogging of the flow path of the pressure air provided on the spindle of the machine tool disclosed in Patent Document 1, the state of the pressure can be constantly monitored because the measurement of the air pressure and flow rate is performed on the spindle side. However, since the structure is complicated and an auxiliary device that is not the purpose of the original processing is attached, there are problems such as cost increase due to a complicated mechanism and complicated maintenance work. In addition, in order to determine the presence or absence of clogging, it is necessary to set a condition for the determination reference value, and fine adjustments such as a delay timing for measuring air pressure and flow rate are required.

  On the other hand, as shown in FIGS. 4 to 6, there is a pressure measuring device that has a tool holder similar to a machining tool, is attached to a main spindle 100 of a machine tool, and visually detects clogging of a flow path of pressure air. Known and used. This is a position corresponding to the first flow path 101 for jetting pressure air provided on the main shaft 100, and the tool holder 2 has a second flow path 202, which is connected to the pressure measurement section 41 as well. There is a third flow path 203, and further, there are provided seven systems of seventh flow path 207 and eighth flow path 208, respectively. The cylinder 43 and the piston 43 slidable in the cylinder interior 45 are connected to the seventh flow path 207. The pressure air supplied from the pressure air supply source on the main shaft side to the air flow path is the first flow path 101 on the main shaft 100 side, the second flow path 202 on the pressure measuring device side, the third flow path 203, and the seventh. It reaches the cylinder interior 45 through the flow path 207, pushes out the slidable piston 43 in the cylinder interior 45, and the state of the flow path can be detected by the movement and distance moved of the piston 43 at that time. The piston 43a is a flow path with a good air flow, and has moved to the end of the cylinder. On the other hand, the pistons 43b and 43c stay on the way, and the air flow path is clogged. Note that the pressure air injected beyond the capacity of the cylinder interior 45 is discharged to the outside through the eighth flow path 208.

  When clogging of the flow path is detected by such a mechanism, the slidable piston is a mechanical type, and since there are a plurality of pistons, there is variation due to sliding resistance, and the cylinder needs to have a certain length. It is easy to bend, the movement of the piston and the amount of movement stroke must be confirmed by human eyes with the machine tool stopped, the piston that has been subjected to air injection once does not return stretched, the flow path, piston and cylinder There were many difficulties, such as the need for frequent cleaning. Therefore, if this pressure sensor is replaced with an electric type, a power source is required. When the power source is a battery type, it is usually assumed that the battery is replaced by opening the cover of the pressure measuring device when the remaining battery level is low. Is the method. Since the pressure measuring device must be used in a place where the mist of the coolant is generated, it is necessary that the electrical part be sealed. Accordingly, when the cover is repeatedly opened and closed for battery replacement, the sealed state is likely to be lowered due to deterioration of parts related to the opening and closing of the cover.

  An object of the present invention is to provide a pressure measuring device and a pressure measuring device system capable of charging the power source without removing the cover of the main body, making up for the above drawbacks.

The pressure measuring device according to the present invention is:
A pressure measuring device detachable from the main shaft for detecting clogging of the first flow path provided in the main shaft in order to blow out pressure air for cleaning to a tool holder detachable from the main shaft of the machine tool,
A pressure sensor connected to the first flow path and having a portion for measuring the pressure air pressure, and detecting a pressure air pressure and outputting a pressure detection signal;
A control circuit board having a control circuit that calculates a pressure value based on a pressure detection signal from the pressure sensor and wirelessly transmits pressure information based on the pressure value;
A rechargeable power supply for supplying power to the pressure sensor and control circuit board;
A power receiving unit of a separate transformer that is electrically connected to the control circuit board and can receive power in a contactless manner;
The control circuit board has a charging circuit for charging the power supply, and has a function of calculating the remaining amount information of the power supply and transmitting the remaining amount information wirelessly.

  The power source is preferably at least one of a secondary battery and an electric double layer capacitor.

The pressure measuring device system according to the present invention includes:
A pressure measuring device;
A power transmission unit of a separate transformer that is provided separately from the pressure measurement device facing the power reception unit of the pressure measurement device, and that can transmit power to the power reception unit in a non-contact manner,
Remaining amount information output means for receiving the remaining amount information wirelessly transmitted from the pressure measuring device and outputting the remaining amount information as at least one of an image and sound;
It is comprised.

The perspective view which shows the structure of the pressure measuring device which showed embodiment of this invention The cross-sectional perspective view which cut | disconnected the pressure measuring device which showed embodiment of this invention in the center The block diagram of the pressure measuring device system at the time of performing power transmission / reception in the embodiment of the present invention Configuration perspective view of conventional pressure measuring device and spindle Configuration perspective view of conventional pressure measuring device and spindle Cross-sectional perspective view of a conventional pressure measuring device cut at the center when pressure detection is performed by attaching to the spindle

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a structural perspective view of a pressure measuring device 1 showing an embodiment of the present invention, and is a perspective view with a cover case 3 removed, showing the inside of the pressure measuring device 1.

  The shank taper portion 2a of the tool holder 2 is a taper shank tool holder that is drawn into the main shaft 100 shown in FIG. 4 and is restrained by the main shaft 100 by two-surface restraint of a taper portion and a flange end surface portion. In this embodiment, a two-surface constrained modular taper tool holder according to JIS B 6065-1 and 2 standards is used, but other two-surface constrained tool holders can be used.

  The flange portion 2b is integrated with the shank taper portion 2a, and is provided for selecting and replacing a plurality of machining tools stored in the tool magazine in the machining center auto tool changer according to the desired machining content. The pressure measuring device 1 of the present invention also has this. Corresponding to the first flow path 101 of the main shaft 100, there are eight air flow paths penetrating.

  The pressure measuring part 4 is connected to the flange part 2b, has eight air flow paths, and houses members for detecting pressure, etc., has a cup shape, and is made of material that is not corroded by coolant or the like. In order to prevent this, an aluminum alloy of A6061 is used.

  The pressure sensor 5 is inserted into an air flow path provided in the pressure measurement unit 4 and detects the pressure in the flow path. In this embodiment, an analog atmospheric pressure sensor manufactured by Metrodyne Microsystem is used. Since the pressure measuring unit 4 has eight air flow paths, a total of eight pressure sensors 5 are provided for each path.

  The wiring board 6 is a board for performing input / output wiring of the eight pressure sensors 5, and is fixed in the pressure measuring unit 4 in an annular shape. The pressure sensor 5 is mounted on this board, and the power supply for driving the pressure sensor 5 and the electrical wiring of the output voltage for pressure detection are made, and connected to a control circuit board 9 described later by a connector and a cable (not shown). ing. Moreover, the wiring board 6 may be a flexible wiring board affixed on a rigid base material, and the connection part with the control circuit board 9 may be comprised of the extension part of this flexible wiring board.

  The power source 7 supplies electric power to the pressure sensor 5 and the control circuit board 9 by means of electrical connection such as an unillustrated electric cable or conductive metal plate. In this embodiment, a rechargeable secondary battery is used, which is a nickel metal hydride or lithium ion battery. Further, when the power source 7 is composed of an electric double layer capacitor, it can be charged quickly, and the type of power source is the power consumption of the pressure sensor 5 and the control circuit board 9 and the continuous use time required for the pressure measuring device 1. These are appropriately selected in consideration of use conditions.

  The control circuit board 9 supplies electric power for driving to the pressure sensor 5, receives the voltage output obtained by the pressure sensor 5, calculates a pressure value, generates pressure information based on this, This signal is A / D converted and modulated and transmitted to the outside by radio. In this embodiment, 2.4 GHz radio is used, but radio transmission at a frequency such as 5 GHz or 920 MHz may be used. The signal transmitted wirelessly is received and demodulated by a personal computer having a receiver, a machine tool having a receiver, or a personal computer having a receiver connected to the machine tool, and the pressure measurement value is converted into data. Stored. In addition, a threshold value is set in advance in the pressure measurement value, and if it is below the threshold value, a warning sound can be emitted or the machine tool can be stopped. Furthermore, the power supply 7 has a function of sampling the voltage and impedance of the power supply 7 at predetermined time intervals to monitor the remaining amount of the power supply 7 and transmitting the remaining amount information of the power supply 7 wirelessly.

  The holding plate 10 is fixed to the bottom of the cup-shaped pressure measuring unit 4, has a shape extending in the cup cylindrical axis direction, and is held between the power source 7 and the control circuit board 9. In addition, a power receiving unit 300 which is a power receiving side of a separate transformer coil described later is also fixedly supported.

  The cover case 3 has a cup shape and is made of a plastic material. The cover case 3 is provided so as to be screwed into the pressure measuring unit 4 so as to cover the members inside the pressure measuring device 1. The airtightness is maintained. Since the pressure measuring device 1 is used in a machine tool such as a machining center, it is an environment where coolant, cutting powder, and the like fall, and airtightness is required to protect the electric circuit and the like from these environments.

  Next, a first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional perspective view cut at the center of the pressure measuring device 1 of the present invention, and shows two of the eight channels. The eight channels are all in the same shape and are radially formed around the central axis of the cup-shaped pressure measuring unit 4.

  The flange end surface portion 2c is a surface that comes into contact with the main shaft 100, and as described above, it is important that the surface of the processing tool is kept free from foreign matter or the like.

  Starting from the flange end surface portion 2c, the second flow path 202 is provided in the axial direction so as to be connected to each of the eight first flow paths 101. In this embodiment, the second flow path 202 has a circular shape with a cross section of 2 mm in diameter, and the starting portion is tapered.

  The second flow path 202 and the third flow path 203 are continuously connected to the tool holder 2 and the pressure measurement unit 4, respectively, and the boundary is hermetically sealed by the O-ring 11. The third channel 203 is also circular with a cross section of 2 mm in diameter.

  The fourth flow path 204 is bent perpendicularly from the third flow path 203 and is provided in the radial direction of the pressure measurement unit 4. In the present embodiment, the fourth flow path 204 is circular with a cross-sectional diameter of 1.45 mm.

  The fifth flow path 205 branches vertically from the fourth flow path 204 and is provided in the axial direction of the pressure measurement unit 4. The pressure sensor 5 is placed in the flow path and has a cross-sectional diameter. Is a 3 mm circle.

  The sixth channel 206 is connected to the fourth channel and is further extended in the radial direction. The diameter of the cross section is a circle of 2.5 mm.

  The above-mentioned diameter dimensions of the respective flow paths are values in the present embodiment, and these values are optimum depending on the shape of the first flow path 101 of the machining center and the set pressure of the blown-out pressure air.

  On the other hand, the power supply 7 is charged by a non-contact charging method, in which the power receiving side forming the pair of the separation type transformer is provided in the pressure measuring device 1 and the power transmission side is provided in the power transmission stand 408. The power receiving side of the separate transformer coil is a power receiving unit 300, which is composed of a shield plate 301, a flat core 302, a coil 303, and a coil holder 304, and is attached to the holding plate 10 as the power receiving unit 300. Yes.

  The shield plate 301 is a base of the power reception unit 300, and uses an aluminum plate to support the power reception unit 300 and prevent leakage of magnetic flux during non-contact power transmission.

  The flat core 302 is bonded to the shield plate 301 with a disk-shaped ferrite, and transmits an alternating magnetic flux generated on the power transmission side to induce a current in the coil 303.

  The coil 303 is wound in a donut shape and is connected to a rectification circuit provided in the control circuit board 9.

  The coil holder 304 is fixed to the flat core 302 so as to hold the coil 303 and guide the lead wire from the coil 303 and also to insulate it from the surroundings. And it arrange | positions in the position which contact | connects the cylindrical cup-shaped inner bottom part of the cover case 3, and it is comprised so that non-contact electric power transmission can be performed.

  FIG. 3 shows a cross-sectional view and a system diagram of a pressure measurement device system using a pressure measurement device, a power transmission stand, and a personal computer when power is transmitted and received in the embodiment of the present invention.

  The power transmission stand 408 is configured for non-contact power transmission to the pressure measurement device 1 side, and includes a power transmission unit 400 provided facing the power reception unit 300 on the pressure measurement device 1 side, and a power transmission side substrate. 405, a bottom plate 406, a hole 407, and a power transmission stand 408.

  The power transmission unit 400 is provided with substantially the same members and substantially the same shape as the power reception unit 300, and constitutes a separate transformer in a pair.

  The power transmission side substrate 405 obtains electric power from an external DC power supply device, and passes the current converted to AC by the inverter circuit to the power transmission side coil 403 to generate an AC magnetic field.

  The power transmission stand 408 stores the power transmission unit 400 and the power transmission side substrate 405 therein so that a part of the cover case 3 of the pressure measuring device 1 in the axial direction can be inserted. Therefore, the power reception unit 300 and the power transmission unit 400 are configured to face each other with the cover case 3 and the power transmission stand 408 interposed therebetween, and non-contact power transmission is performed. The hole 407 is an escape hole for air and adhering coolant when the cover case 3 is inserted into the power transmission stand 408 and facilitates insertion.

  The current generated in the coil 303 is rectified by a rectification circuit in the control circuit board 9 and the power supply 7 is charged by the charging circuit in the control circuit board 9.

  An O-ring 8 is provided between the cover case 3 and the pressure measuring unit 4 so as to keep the inside airtight. However, depending on the usage environment, the cover case 3 is removed every time the power source 7 is charged. There is a case where deterioration of the O-ring 8 and the cover case 3 is promoted to cause a decrease in airtightness. In the embodiment of the present invention, since the power source 7 in the pressure measuring device 1 can be charged using non-contact power transmission, the power source 7 can be charged without bothering to remove the cover case 3.

  The personal computer 503 has a receiving function capable of receiving information transmitted from the pressure measuring device 1. Therefore, the personal computer 503 also has information output means for receiving the remaining amount information of the power source 7 wirelessly and outputting the remaining amount information as an image and sound. Therefore, a pressure measuring device system 20 that prompts charging at an appropriate time is possible.

  In addition, when the pressure measuring device 1 is inserted into the power transmission stand 408 to perform power transmission / reception and to charge the power source 7, the control circuit board 9 displays information on the remaining amount of the power source 7, that is, the state of charge. Calculate and transmit this wirelessly. The personal computer 503 receives this and outputs the charging status information as an image or sound, and can output the remaining amount of the power supply 7 and the remaining time until the charging is completed.

  The pressure measuring device 1 according to the present invention described above is mounted on a tool magazine of an automatic tool changer of a machining center, the pressure measuring device 1 is selected at an arbitrary timing by programming of the machining center, and is mounted on a main shaft 100 to perform pressure. By blowing out the air, the clogging check of the first flow path 101 provided in the main shaft 100 can be performed. Since the remaining amount information of the power source 7 in the pressure measuring device 1 can be obtained wirelessly, and the state when the power source 7 is charged can be easily known, the power source 7 can be charged without causing as much loss time as possible. The scheduling to be performed becomes easy.

Further, the pressure measuring device 1 according to the present invention can be used as long as it is a machine tool corresponding to a tool holder of the same standard, so that it is highly versatile and can be used for other machine tools of the same standard. is there.

  As an application example of the present invention, it can be applied as a maintenance tool of a machine tool such as a machining center.

DESCRIPTION OF SYMBOLS 1 Pressure measuring device 2 Tool holder 2a Shank taper part 2b Flange part 2c Flange end surface part 3 Cover case 4 Pressure measuring part 5 Pressure sensor 6 Wiring board 7 Power supply 8 O-ring 9 Control circuit board 10 Holding board 11 O ring 12 Pressure measuring apparatus System 41 Pressure measurement unit 42 Cylinders 43, 43a, 43b, 43c Piston 44 O-ring 45 Cylinder inside 100 Main shaft 101 First flow path 202 Second flow path 203 Third flow path 204 Fourth flow path 205 Fifth Channel 206 206 Sixth channel 207 Seventh channel 208 Eight channel 300 Power reception unit 301 Shield plate 302 Flat core 303 Coil 304 Coil holder 400 Power transmission unit 401 Power transmission side shield plate 402 Power transmission side flat core 403 Side coil 404 Power transmission side coil holder 405 Power transmission side substrate 406 Bottom plate 407 408 power transmission stand 503 personal computer

Claims (3)

A pressure measuring device detachable from the main shaft for detecting clogging of a first flow path provided in the main shaft in order to blow out pressure air for cleaning to a tool holder detachable from the main shaft of a machine tool. ,
A pressure sensor connected to the first flow path and having a portion for measuring the pressure air pressure, and detecting a pressure of the pressure air and outputting a pressure detection signal;
A control circuit board having a control circuit that calculates a pressure value based on the pressure detection signal from the pressure sensor and wirelessly transmits pressure information based on the pressure value;
A rechargeable power source for supplying power to the pressure sensor and the control circuit board;
A power receiving unit of a separate transformer that is electrically connected to the control circuit board and can receive power in a contactless manner;
The pressure measurement device, wherein the control circuit board has a charging circuit for charging the power source, and has a function of calculating the remaining amount information of the power source and transmitting the remaining amount information wirelessly.   The pressure measuring apparatus according to claim 1, wherein the power source is at least one of a secondary battery and an electric double layer capacitor. The pressure measuring device;
A power transmission unit of the separation type transformer that is provided separately from the pressure measurement device facing the power reception unit of the pressure measurement device, and that can transmit electric power to the power reception unit in a contactless manner,
A remaining amount information output means for receiving the remaining amount information wirelessly transmitted from the pressure measuring device and outputting the remaining amount information in at least one of an image and sound;
A pressure measuring device system comprising: