JP2678344B2 - Rotation speed and gripping force measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed and a gripping force measuring device for knowing the relationship between the gripping force of a rotating chuck such as a machine tool and the rotational speed thereof.

[0002]

2. Description of the Related Art Generally, it is said that the gripping force of a rotating body such as a chuck for gripping a work in a machine tool or the like decreases in inverse proportion to the square of the rotation speed. At present, when high-speed machining is in progress, unless the machining is performed by setting the gripping force and the rotation speed after recognizing the relationship between the rotation speed and the gripping force, the machining accuracy and safety will be greatly affected. You will receive it.

Therefore, in the conventional measurement of the gripping force and the number of rotations of a chuck or the like, the gripping force is measured by gripping a gripping force meter using a strain gauge on a chuck claw, and is displayed electrically on a display. On the other hand, the number of rotations is measured by mounting a rotation speed measuring device on the rotation motor or the rotation drive shaft which is the driving source of the rotation and electrically linking them to the display unit to confirm the displayed values respectively, and synthesize the relation graph etc. -ing

Therefore, in the above-mentioned conventional measuring means, the gripping force and the number of revolutions are measured at different parts by using individual instruments, and each measured value is electrically displayed by its own wiring. It is processing. This is because there are two measuring instruments, each of which needs to be attached and stored, which complicates handling, requires adjustment by adjusting the two measuring instruments, and measurement at different locations and different axes. Therefore, it has been pointed out that there are problems such as not being able to perform accurate numerical measurement at the chuck portion.

[0005]

SUMMARY OF THE INVENTION In view of the above points, therefore, the present invention collects two measuring instruments into one, reduces the size and weight, and obtains two measured values by engaging with one shaft at one place. In this way, it is possible to provide a rotation speed and gripping force measuring device that is easy to handle, secures the simplicity and accuracy of measurement, and simultaneously transmits to the display unit and has a configuration that can be adjusted.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a slip ring receiver is integrally provided on a rotating body having a gripping portion such as a chuck claw or the like on the periphery thereof, and a gripping force detecting sensor incorporated in the gripping portion is incorporated. The slip ring receiver is rotatably gripped by the case and is joined to the slip ring installed inside the case. On the other hand, a detection piece is provided on the upper circumferential surface of the slip ring receiver located inside the case, The rotational speed detection sensor is fixed inside the case so as to face the peripheral surface, and the gripping force detection sensor and the rotational speed detection sensor are connected to the connector provided on the case.

[0007]

The rotating body having the gripping force detection sensor for measuring the gripping force of the chuck is integrally connected to the case through the slip ring receiver rotatably held, and the slip ring and the slip ring receiving member are connected together. By connecting with the body, it is possible to energize the gripping force detection sensor and send an electric signal of the measured value to the display unit. Then, the number of rotations is measured by detecting the detection piece provided on the upper circumferential surface of the slip ring receiver which is gripped by the chuck claws and driven to rotate, by the rotation number detection sensor fixed in the non-rotating case, An electric signal is sent to the display section.

Therefore, by causing the chuck claw to grip the rotating body, the grip force and the rotation speed of the chuck claw can be directly measured, and the rotating part having the grip force detection sensor and the case in which the rotation speed detection sensor is fixed are provided. Since they are integrated with each other, it is possible to simultaneously transmit the electric signals of the energization and the measured value through the slip ring in the case together with the electric signals.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional front view showing an embodiment of the present invention, which includes a case 1, a rotating body 2 having a gripping force detection sensor 7 installed therein, a slip ring receiver 3, a slip ring 4,
It is composed of a photo reflector 5 which is a rotation speed detection sensor and a connector 6. The rotating body 2 and the slip ring receiving body 3 are integrally fixed to each other by bolts 8A, and the slip ring receiving body 3 is rotatably held in the case 1 via bearings 22 and 22.

Grips 9A, 9B and 9C are formed on the outer periphery of the rotating body 2 so that the claws of the chuck can press it. Further, the gripping force detection sensor 7 is provided in a recessed hole 10 formed on the side surface of the rotating body 2, and is constructed by mounting strain gauges 14, 14 ... On a cantilever plate 13 provided between the front block 11 and the base block 12. The base block 12 is fixed to the bottom surface of the recessed hole 10 with a bolt 8B, and the front block 11 has the gripping portion 9
One grip portion 9A is attached (FIG. 2).

Therefore, the gripping force of the chuck claws can be detected by the strain gauges 14, 14 ... Through the front block 11 and the cantilever 13 by the grip portion 9A. The electric signal obtained by converting the detected gripping force passes through the wiring hole 20 provided in the slip ring receiving body 3 and the internal wiring 15 to the connector 6 via the slip ring 4 to be joined to the external display section 21. Transmitted.

On the other hand, the upper circumferential surface 16 of the slip ring receiver 3 is colored black, and a silver paper 17 which is a reflector is adhered to it as a detection piece. Then, facing the upper end circumferential surface 16, the photo reflector 5 is fixed as a detection sensor in the case 1 by a support piece 18. Therefore, since the slip ring receiver 3 also rotates following the rotation of the rotating body 2 gripped by the chuck claws, the photo reflector 5 detects the silver paper 17 attached to the facing upper circumferential surface 16, The rotation speed of the chuck can be measured.
Is transmitted to

A gripping force detector using a strain gauge shown in the drawings, a photo reflector which is a rotation speed detecting sensor,
Also, the silver paper as the detection piece is an example, and is not limited to this specific configuration. If the display unit 21 is digitally displayed, the gripping force and the number of rotations can be simultaneously recognized in real time and numerically, which facilitates reading and the relationship between both numerical values.

[0014]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the gripping force and the number of revolutions, which were conventionally measured by using independent measuring instruments at two locations, can be measured at one location and with a single measuring instrument. Therefore, there is an effect that the size and weight can be reduced and the handling is very easy. Since the rotation of the gripping portion is directly measured as the number of rotations, there is no room for error in the measured values of the two, and it is possible to know the relationship based on the accurate measured values, greatly improving processing accuracy and safety. Has an effect that can contribute. Furthermore, since the gripping force and the number of revolutions can be measured from a single measuring tool, the information can be easily sent simultaneously and in real time to the display unit.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view showing an embodiment of the present invention.

FIG. 3 is an example of a circuit configuration diagram showing a relationship between the device of the present invention and a display unit.

[Explanation of symbols]

 1 Case 2 Rotating Body 3 Slip Ring Receiver 4 Slip Ring 5 Photo Reflector 6 Connector 7 Gripping Force Detection Sensor 9 Gripping Part 10 Recessed Hole 11 Forward Block 12 Base Block 13 Cantilever Plate 14 Strain Gauge 15 Internal Wiring 19 Internal Wiring 16 Top Circle Peripheral surface 17 Silver paper (detection piece) 18 Support piece 20 Wiring hole 21 Display section 22 Bearing

Claims (1)

(57) [Claims] 1. A slip ring receiver is integrally provided on a rotating body that has a gripping portion such as a chuck claw around it, and a gripping force detection sensor incorporated in one gripping portion is incorporated, and the slip ring receiving body is a case. It is rotatably gripped and is joined to the slip ring inside the case.On the other hand, the slip ring receiver located inside the case is provided with a detection piece on the upper circumferential surface and rotates facing the upper circumferential surface. A rotation speed and gripping force measuring device characterized in that a number detection sensor is fixed in a case, and a gripping force detection sensor and a rotation speed detection sensor are connected to a connector provided on the case.