JP2005156336A - External force detection device and material processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To customize the external force detection level at the user side of a switch. <P>SOLUTION: The external force detection device comprises the frame 17 of a pipe shape; the shaft 21 provided over the in/out side of the frame 17; the magnet 34 provided in the frame 17 in embodiment that the axial direction of the frame 17 aligns with the magnetic poles; the hole IC 36 for detecting whether the relative axial displacement caused by the shaft 21 placed in the frame 17 receiving the external force is larger than the prescribed threshold or not; and the adjusting screw 20a for adjusting the distance between the hole IC 36 and the magnet 34 and the hole IC cramp 38. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an external force detection device and a material processing system, and more particularly to an external force detection device and a material processing system that detect external force in other stages.

  Conventionally, as an ultra-small and inexpensive magnetically sensitive switch that requires very little operating force, a movable member and a coil spring are disposed in a switch case, and the coil spring supports the movable member, and the upper end of the movable member is Some of them protrude from the opening on the upper surface of the switch case. This switch has a Hall IC in the switch case. When the upper end is pressed, the magnet fixed to the movable member moves downward and the output signal of the Hall IC changes from OFF to ON. (Patent Document 1).

  In addition, as a small, simple and inexpensive non-contact pressure switch, a pressure corresponding to the water level in the water tank is applied to the diaphragm bracket via the pressure inlet, and the diaphragm bracket is moved according to the rise in pressure. There is a switch that moves to the left while pressing the spring, and the NS pole boundary of the magnet also moves to the left. This switch is such that, along with the movement of the magnet, the Hall IC having the magnetic sensitivity at the boundary line is turned on to generate an ON output, and the corresponding indicator lamp is lit (Patent Document 2).

  In addition, as an integrated unit that operates remotely located switches in response to mechanical displacements in various atmospheres, a magnet is compressed into a square switch housing with a Hall IC enclosed in an insert mold. There is a unit in which square pipes that are slidably supported by being biased in one direction are adjacent to each other, and a heat-shrinkable tube that has been deposited is heat-shrinked so that they are integrally connected. In this unit, the fine stainless steel wire fixed to the magnet is slidably fitted on the outer sheath of the stainless steel tube, and the free end protrudes from the tip of the tube. The thin line transmits the displacement of the free end to move the magnet, and turns on at least one of the Hall ICs to send a signal (Patent Document 3).

  According to the switches described in Patent Documents 1 to 3, it is possible to detect the presence or absence of an external force received by the switch based on the presence or absence of a signal from the Hall IC based on the relative displacement between the magnet and the Hall IC.

  Moreover, the mechanism of the external force detection in the switches described in Patent Documents 1 to 3 is, for example, an aspect in which the NS pole boundary of the magnet straddles the operating point of the Hall IC, and the relative relationship between the magnet and the Hall IC. This is based on the principle that the Hall IC is switched on / off when there is a significant displacement.

  Such a switch has an excellent detection power capable of detecting an external force of about 1 g. In other words, if the distance between the magnet and the Hall IC when the switch is not receiving external force is adjusted, this type of switch can detect external force with high accuracy.

JP 2003-151390 A JP 2003-217812 A JP 2003-16893 A

  Therefore, an object of the present invention is to make it possible to customize the detection level of the external force on the user side of the switch.

  In order to solve the above-described problem, an external force detection device according to the present invention includes a pipe-shaped frame, an external force receiving portion installed over the inside and outside of the frame, and a magnetic pole positioned in the axial direction of the frame. Whether the relative displacement in the axial direction between the magnet installed in the frame and the magnet located in the frame and receiving the external force from the external force is greater than or equal to a predetermined threshold value And a change unit that changes a distance between the detection unit and the magnet when the external force receiving unit is not receiving an external force.

  For example, the change unit includes an installation unit in which the detection unit or the magnet is installed, and a shaft that defines a position of the installation unit in the axial direction. Further, the changing unit includes a defining unit that defines a position of the detection unit or the magnet in the radial direction of the frame, and a positioning unit that determines an installation position of the detection unit or the magnet.

  A square pipe containing the external force receiving part may be installed in the frame, and the detection part or the magnet may be pressed against the outer wall of the square pipe. Further, the magnet may be connected to the external force receiving portion, and a plurality of the detection portions may be pressed against the outer wall of the square pipe.

  The material processing system of the present invention includes any one of the external force detection devices described above and a machine tool having an arm serving as a supply source of the external force detected by the external force detection device.

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

(Embodiment 1)
Fig.1 (a) is a typical external view of the other stage switch 10 of Embodiment 1 of this invention. FIG.1 (b) is a part of side view of the other step switch 10 shown to Fig.1 (a).

  As shown in the figure, the other-stage switch 10 is roughly divided into a threaded switch body 12 and a notification unit 26 that indicates the state of signals from the switch body 12.

  Nut portions 14 and 16 for attaching the switch body 12 to an attachment body (not shown) are attached to the switch body 12. The mounting body is provided with an opening hole having a diameter slightly larger than the diameter of the switch body 12. After the switch body 12 is inserted into the opening hole, the periphery of the opening hole is tightened by the nut portions 14 and 16. To install.

  The switch body 12 has a pipe-shaped frame 17 that encloses a magnet and a Hall IC, which will be described later. At one end side of the frame 17, a shaft 21 is provided so as to extend inside and outside the frame.

  The shaft 21 has a tip 22 that contacts an arm or the like of a machine tool (not shown). Further, the shaft 21 is covered with a jagged member 18 made of rubber or the like that expands and contracts in response to insertion and return of the shaft main body with respect to the frame 17. The jaguar 18 mainly prevents dust and the like from entering the switch body 12.

  An end plate 23 is fixed to the other end side of the frame 17. The end plate 23 is provided with a hole through which a transmission line 24 for transmitting a signal from the Hall IC to the notification unit 26 side and a transmission line receiving unit 46 are provided at the center, and a magnet and a Hall IC in the axial direction of the frame 17 at the periphery. A hole through which the adjusting screws 20a to 20c and the like for changing the distance between the first and second screws is provided.

  In the present embodiment, four Hall ICs and four adjustment screws are prepared, for example, so that the position of the arm or the like of the machine tool can be detected in four stages. Each Hall IC is connected to each wiring 30 in the transmission line 24.

  On the other hand, the notification unit 26 includes LEDs 28a to 28d corresponding to the respective Hall ICs, and lights or blinks when a signal from each Hall IC indicates, for example, an ON state. The transmission line 24 is connected to a control device (not shown). This control device controls driving of an arm of a machine tool, for example, according to a signal from the other stage switch 10.

  Note that the notification unit 26 may employ not only visual notification by light but also auditory notification by sound, sensory notification by vibration, and the like. Furthermore, the signal from the Hall IC may be transmitted not only by wire via the transmission line 24 but also wirelessly.

  FIG. 2A shows a part of a horizontal sectional view in the longitudinal direction of the other stage switch 10 shown in FIG. FIG. 2B shows a part of a longitudinal sectional view of the other-stage switch 10 shown in FIG. 1 in the longitudinal direction. FIG. 2C shows a part of a sectional view in the vertical direction of the short-side direction of the other stage switch 10 shown in FIG.

  2A to 2C show only one Hall IC 36 on the upper part of the square pipe 44 for convenience of explanation, but in reality, the Hall IC is formed of the square pipe 44. It is also installed on both sides and the bottom.

  As shown in the drawing, the frame 17 includes, on the shaft 21 side, a stopper portion 17a for defining the movable range of the shaft 17, an escape portion 17b of the expanded and contracted jagged member 18, and a mounting portion 17c of the jagged member 18. It has a step shape.

  Further, the frame 17 is provided with a square pipe 44 including the shaft 21 to which the magnet 34 is attached. In the square pipe 44, a spring 42 for returning the shaft 21 inserted toward the frame 17 by receiving an external force, and a defining portion 32 for defining the position of the magnet 34 when the shaft 17 is not receiving the external force. And are provided.

  The square pipe 44, the frame 17, the shaft 21, the end plate 23, and the like are made of a nonmagnetic material such as SUS or brass.

  The transmission line receiving portion 46 provided on the end plate 23 has a curved shape on the transmission line 24 side so that even if stress is applied to the transmission line 24, the transmission line 24 is not damaged.

  Here, the magnet 34 is a columnar magnet attached to the shaft 21 in such a manner that the axial direction of the switch body 12 is a magnetic pole. Further, at the upper part of the square pipe 44, there is provided a Hall IC 36 for detecting whether or not the displacement amount is equal to or greater than a predetermined threshold when the magnet 34 is displaced due to the external force of the shaft 21. ing. The Hall IC 36 is electrically connected to the wiring 30 in the transmission line 24 via the lead wire 40.

  Here, an example is shown in which the magnet 34 is attached to the shaft 21 and the Hall IC 36 is provided on the square pipe 34 side. However, the shaft 21 is, for example, prismatic, and the Hall IC 36 is attached to the square pipe 34 side. 34 may be provided. Furthermore, the square pipe 34 may be changed from a rectangular column shape to, for example, a hexagonal column shape, and six Hall ICs may be provided.

  FIG. 3A is an enlarged plan view of the Hall IC clamp 38 shown in FIG. FIG. 3B is a side view of FIG. FIG. 3C is an enlarged side view from the shaft 21 side of the Hall IC clamp 38 shown in FIG. FIG. 3D is an enlarged side view of the Hall IC clamp 38 from the end plate 23 side shown in FIG.

  As shown in the figure, the Hall IC clamp 38 is mounted to define a main body portion 38d that is long in the axial direction of the frame 17, a mounting portion 38a on which the Hall IC 36 is mounted, and a mounting position of the Hall IC 36. The main body for defining the radial position of the Hall IC 36 by pressing the inner wall of the frame 17 and the first to third auxiliary parts 38e to 38g bent at right angles to the main body part 38d around the mounting part 38a. Pressing portions 38b and 38c bent at a required angle with respect to the portion 38d, a notch portion 38i for connecting to the adjusting screw 20a, and a screw receiving portion bent at a right angle with respect to the main body portion 38d. 38h and an opening 38j provided in the screw receiving portion 38 and into which the neck of the adjusting screw 20a is fitted.

  When the Hall IC 36 is attached to the Hall IC clamp 38, first, an adhesive is applied to the placement portion 38a or the Hall IC 36. Subsequently, the Hall IC 36 and the mounting portion 38a are brought into contact with each other on the adhesive application surface, and then the adhesive is dried. At this time, since the Hall IC 36 is held in position by the first to third auxiliary portions 38e to 38g, it is not necessary to perform a troublesome work of performing the exact alignment.

  The Hall IC clamp 38 is inserted into the frame 17 after the adjustment screw 20a is attached to the opening 38j of the Hall IC clamp 38 to which the Hall IC 36 is attached or before the adjustment screw 20a is attached.

  Here, the corner of the Hall IC 36 on the side of the shaft 21 is inclined, so that the Hall IC 36 can be easily accommodated in the upper portion of the square pipe 44. Actually, when the Hall IC clamp 38 is further inserted into the frame 17 after the inclined portion of the Hall IC 36 reaches the upper portion of the square pipe 44, the holding portions 38b and 38c are separated from the inner wall of the frame 17. Under stress, it is pushed and bent toward the axial direction of the main body 38d.

  Then, a force for returning to the original works is exerted on the holding portions 38 b and 38 c, and as a result, the Hall IC 36 is pressed against the outer wall of the square pipe 44. Thus, the radial position of the Hall IC 36 is defined.

  FIG. 4A is an enlarged plan view of the end plate 23 shown in FIG. FIG. 4B is a cross-sectional view of the end plate 23 shown in FIG.

  As shown in the drawing, the end plate 23 is provided with a hole 23e through which the transmission line 24 is passed, and holes 23a-23d through which threading through the adjusting screws 20a-20d is performed. The holes 23a to 23d have a larger opening than the threaded portion in order to facilitate attachment of the adjusting screws 20a to 20d, respectively.

  The hole 23e has a diameter that does not cause a gap when passing through the transmission line 24 in order to prevent dust and the like from entering the switch body 12. The number of holes 23a to 23d is the same as the number of Hall ICs. If the number of Hall ICs is six, for example, the number of holes 23a to 23d is six.

  FIG. 5A is an enlarged cross-sectional view of the adjusting screw 20a shown in FIG. FIG. 5B is an enlarged view of the vicinity of the tip 48 of FIG. The other adjustment screws 20b to 20d have the same configuration as the adjustment screw 20a shown in FIG.

  As shown in the figure, the adjusting screw 20a has a tip portion 48 having both ends tapered. A neck 52 that is fitted into the opening 38j of the Hall IC clamp 38 is provided adjacent to the tip 48. A body part 50 having a threaded part attached to the hole 23a of the end plate 23 is located slightly apart from the neck part 52. The end portion of the threaded portion includes a terminal portion 54 in which a driver receiver for rotating the adjustment screw 20a main body is formed. The adjusting screw 20a is made, for example, by applying electroless nickel plating to iron.

  The neck part 52 has an inclined part inclined with respect to the main body part 50 and the tip part 48 and a bottom part located in a valley between the inclined parts. The diameter of the bottom is made smaller than the opening diameter of the opening 38j of the Hall IC clamp 38.

  When a driver is applied to the driver receiver formed on the terminal end 54 of the adjusting screw 20a and the adjusting screw 20a is rotated, the position of the tip 48 changes with respect to the hole 23a of the end plate 23. Therefore, at this time, if the neck 52 of the adjusting screw 20a and the opening 38j of the Hall IC clamp 38 are connected, the position of the Hall IC clamp 38 with respect to the end plate 23 changes.

  For this reason, the position of the Hall IC 36 fixed to the Hall IC clamp 38 also changes, and as a result, the distance in the axial direction of the switch body 12 between the Hall IC 36 and the magnet 34 is displaced. That is, when the adjustment screw 20a is rotated, the axial distance of the switch body 12 between the Hall IC 36 and the magnet 34 can be displaced.

  Next, a mechanism for detecting an external force by displacement between the magnet 34 and the Hall IC 36 will be described. First, the magnet 34 is installed so that the boundary line between the S and N poles straddles the operating point of the Hall IC 36 before and after displacement.

  Here, there are magnetic lines of force connecting the S pole and the N pole in a curved manner around the magnet 34. In addition, there are isomagnetic lines around the magnet 34 that pass through the same magnetic force. Each isomagnetic line is orthogonal to each magnetic line. Further, the isomagnetic line from the boundary line between the SN poles of the magnet 34 is 0 gauss, and the strength of the magnetic force of the isomagnetic line increases as the distance from the boundary line increases.

  When the shaft 21 is not receiving an external force, an isomagnetic surface of, for example, 20 gausses on the N pole side of the magnet 34 is located on the left side of the operating point of the Hall IC 36. At this time, the Hall IC 36 is in an off state.

  Next, when the shaft 21 receives an external force, the position of the magnet 34 is displaced to the right side. If this external force is equal to or greater than a predetermined first threshold value, the 20 Gauss isomagnetic surface on the S pole side of the magnet 34 passes through the operating point of the Hall IC 36 and is positioned on the right side of the operating point of the Hall IC 36. To come.

  Then, the Hall IC 36 shifts from the OFF state to the ON state, and an ON signal is output from the Hall IC 36 toward the lead wire 40. Thereby, an ON signal flows through the transmission line 24, and the LED 28a of the notification unit 26 is turned on or blinks.

  Further, when the shaft 21 receives an external force exceeding a second threshold value that is larger than the first threshold value, the position of the magnet 34 is further displaced to the right side. Then, the 20 Gauss isomagnetic surface on the S pole side of the magnet 34 passes through the operating point of another Hall IC (not shown). Then, the other Hall IC shifts from the OFF state to the ON state, an ON signal is output from the other Hall IC, an ON signal flows through the transmission line 24, and, for example, the LED 28b of the notification unit 26 is lit or blinks.

  Similarly, when the shaft 21 receives an external force that exceeds a third threshold value that is greater than the second threshold value and further exceeds a fourth threshold value that is greater than the third threshold value, for example, the LEDs 28c and 28d of the notification unit 26 are sequentially lit or blinked. . For this reason, by performing the operation of rotating the adjusting screws 20a to 20d, not only the intensity of the external force is detected in another stage, but also the user of the other stage switch 10 can set the intensity.

  After that, when the shaft 21 no longer receives external force, the 20 gauss isomagnetic surface on the N pole side of the magnet 34 returns to, for example, the left side of the operating point of the Hall IC 36, the Hall IC 36 etc. returns to the OFF state, and the ON signal is Stop.

  Although it depends on the setting accuracy of the distance between the magnet 34 and the Hall IC 36, it can be detected even if the external force received by the shaft 21 is about 1 g, and the magnet 34 is actually displaced by several μm. Simply switching on / off the ON signal.

(Embodiment 2)
FIG. 6 is a horizontal sectional view in the longitudinal direction of another stage switch 10 ′ according to the second embodiment of the present invention, and corresponds to FIG. 2 (a). In FIG. 6, the same parts as those shown in FIG.

  In the present embodiment, in order to change the distance between the Hall IC 36 and the magnet 34, the adjustment screw 62 connected to the Hall IC clamp 38, the adjustment screw receiver 60 attached to the end of the square pipe 44, and the adjustment screw A spring 64 provided between the receiver 60 and the Hall IC clamp 38 and including an adjustment screw 62 is provided.

  When the axial distance of the switch body 12 between the Hall IC 36 and the magnet 34 is changed, the adjustment screw 62 may be rotated in the same manner as the adjustment screw 20a is rotated in the first embodiment. As a result, the position of the Hall IC clamp 38 is changed, and the position of the Hall IC clamp 38 is held by the spring 64.

  The configuration of other parts of the other stage switch 10 ′ of this embodiment, the operating principle, and the like are the same as those of the other stage switch 10 described in the first embodiment.

(Embodiment 3)
As described above, in the first and second embodiments, the other stage switches 10 and 10 ′ in which the ON signal is output from the Hall IC 36 when the shaft 21 receives an external force have been described as an example. However, it is not limited to these.

  For example, a movable member and a coil spring are disposed in the switch case, the coil spring supports the movable member, and the upper end portion of the movable member protrudes from the opening of the upper surface portion of the switch case (Patent Document 1), A pressure corresponding to the water level in the water tank is applied to the diaphragm bracket through the pressure inlet, and the diaphragm bracket moves to the left while pressing the spring as the pressure rises, and the NS of the magnet A switch that moves the pole boundary to the left (Patent Document 2) and a square switch housing with a Hall IC enclosed in an insert mold. For the switch unit (Patent Document 3) in which the supporting square pipes are adjacent and the attached heat-shrinkable tube is heat-shrinked to connect them together. It becomes possible to apply by providing a C-clamp 38 and the adjustment screw 20a~20d like.

  Furthermore, similarly, it can be applied to a switch that detects that an iron piece outside the switch is located at a predetermined distance from the switch body. This switch includes a magnet that can be displaced in a linear direction and a Hall IC that detects the displacement of the magnet. When the iron piece is positioned within a predetermined distance from the switch body, the iron piece is strongly magnetized and the magnet is displaced toward the iron piece side.

  Further, for example, in a machine tool having an arm, if the other stage switch described above is used as a switch for controlling the arm position, the arm position at another stage can be controlled with high accuracy, It becomes feasible that the user defines the arm movable range.

  The application of the other-stage switch 10 is not limited to machine tools, and can be widely applied to automobiles, elevators, care devices, home security systems, mobile phones, disconnection detection systems, and the like.

  The present invention is applicable to machine tools, automobiles, elevators, care devices, home security systems, mobile phones, disconnection detection systems, and the like.

It is a typical external view of the other stage switch 10 of Embodiment 1 of this invention. It is sectional drawing of the other stage switch 10 shown in FIG. FIG. 3 is an enlarged view of the Hall IC clamp 38 shown in FIG. 2. It is an enlarged view of the end plate 23 shown in FIG. It is an enlarged view of the adjusting screw 20a shown in FIG. It is sectional drawing of the other stage switch 10 'of Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Other stage switch 12 Switch body 14,16 Nut part 17 Frame 17a Stopper part 17b Escape part 17c Mounting part 18 Jagara 20a-20d, 62 Adjustment screw 21 Shaft 22 Tip part 23 End plate 23a-23e Hole 24 Transmission line 26 Notification part 28a-28d LED
30 Wiring 32 Regulatory part 34 Magnet 36 Hall IC
38 Hall IC clamp 38a Placement part 38b, 38c Holding part 38d Main body part 38e-38g First to third auxiliary parts 38h Screw receiving part 38i Notch part 38j Opening part 40 Lead wire 42 Spring 44 Square pipe 46 Transmission line receiving part 48 Tip 50 Main body 52 Neck 54 Terminal 60 Adjusting screw receiver 62 Adjusting screw 64 Spring

Claims (6)

A pipe-shaped frame,
An external force receiving portion installed over the inside and outside of the frame;
A magnet installed in the frame in such a manner that the magnetic pole is positioned in the axial direction of the frame;
A detection unit for detecting whether or not a relative displacement amount in the axial direction with the magnet due to the external force receiving unit receiving an external force located within the frame is equal to or greater than a predetermined threshold;
An external force detection device comprising: a change unit that changes a distance between the detection unit and the magnet when the external force receiving unit is not receiving external force. The changing unit is
An installation part in which the detection part or the magnet is installed;
2. The external force detection device according to claim 1, further comprising a defining portion that defines a position of the installation portion in the axial direction. The changing unit is
A defining portion for defining a radial position of the frame of the detection portion or the magnet;
The external force detection device according to claim 1, further comprising a positioning unit that determines an installation position of the detection unit or the magnet. The external force according to any one of claims 1 to 3, wherein a square pipe containing the external force receiving portion is installed in the frame, and the detection portion or the magnet is pressed against an outer wall of the square pipe. Detection device. The external force detection device according to claim 4, wherein the magnet is connected to the external force receiving portion, and a plurality of the detection portions are pressed against an outer wall of the square pipe. The external force detection device according to any one of claims 1 to 5,
A material processing system comprising: a machine tool having an arm serving as a supply source of the external force detected by the external force detection device.

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