JPS6226697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a torque meter for a grinding machine that covers a commonly used torque range and also has a gap elimination function.

[Prior Art] Generally, it is difficult to use conventional torque meters for grinding machines to function as gear eliminators, and it is difficult to use them to function as gear eliminators. For example, fluctuations in power consumption are detected using a wattmeter attached to the motor. There are problems with the response speed and resolution with the method of attaching the strain gauge to the workpiece support center, and there are similar problems with the method of attaching the strain gauge to the workpiece support center. I can't.

However, when the grinding wheel approaches the workpiece,
Due to the action of the grinding fluid, the motor torque increases slightly just before the two contact, so if the torque meter covers the commonly used range and at the same time has a sufficiently large resolution in the small torque region, the grinding wheel will not touch the workpiece. It has an effective gap elimination function that can detect the point immediately before contact. Therefore, if a torque meter with such a gear elimination function is used, the grinding wheel will not wear up due to collision with the workpiece, and will be effective in shortening the grinding cycle time. It is also unnecessary to make significant changes or modifications to the configuration of the signal processing system in the grinding machine.

As a technology that can be used to meet such requirements, for example, Japanese Utility Model Publication No. 50-35743 discloses a multi-stage switching torque meter used in chassis dynamometers, etc., which detects a plurality of torque sensors that can sense any desired torque. A structure is disclosed in which torque measurement is performed by automatically switching sensing sections.

However, as a torque meter for a grinding machine, in order to simplify the configuration of the grinding machine itself and save space, a multi-stage switching torque meter such as the one described above is incorporated into the motor for driving the grinding wheel rotation shaft. Moreover, especially when incorporating it,
It is required to consider the following matters:

In other words, a torque meter for a grinding machine with a gear eliminate function has a high-sensitivity part that is necessary to detect minute torque fluctuations for the gear eliminate function, and a low-sensitivity part that can withstand the torque required during normal grinding. Considering these characteristics, it is effective and appropriate to use a coiled spring for the high-sensitivity section and a rotating shaft that functions as a torsion bar for the low-sensitivity section. It is. Moreover, the coiled spring that constitutes the high-sensitivity section is mounted outside the motor, making maintenance and replacement easy, and the high-sensitivity area and It is required that the sensitivity itself be freely set.

[Problems to be Solved by the Invention] An object of the present invention is to provide a torque meter having such a gear elimination function and having a unique configuration for use in a grinding machine. The rotary shaft that transmits the drive torque for grinding functions as a low-sensitivity torsion bar, and a coiled spring is used for the high-sensitivity part that detects minute torque fluctuations for the gear elimination function, and these are used to rotate the grinding wheel. The purpose of this invention is to suitably arrange the motor for driving the shaft and its drive system, and to adapt it to use as a grinder.

[Means for Solving the Problems] In order to achieve the above object, the torque meter for a grinding machine of the present invention has a rotating shaft that functions as a low-sensitivity torsion bar at one end of a hollow drive shaft of a motor that drives a grinding wheel rotating shaft. In the rim of a power transmission wheel that fixes one end of the shaft and is attached to the other end of the rotating shaft guided through a hollow drive shaft, there is a system for highly sensitive torque detection between the rotating shaft and the rim. An engaging protrusion that interposes a coiled spring and that engages after the spring is twisted by an angle necessary to perform the gear eliminator function to directly engage the rotating shaft and the rim. , and a detection device for detecting the torsion angle of the rotating shaft and the spring as a transmitted torque.

[Function] When the grindstone is rotated by the motor and the workpiece approaches the grindstone, a small increase in torque just before they come into contact is detected by the torsion angle of the spring, and the torque meter detects the gear. It will have a pre-elimination function.

In addition, the torque after the grinding wheel contacts the workpiece is
It is detected by the torsion angle of the rotating shaft that covers the commonly used torque range.

When detecting such torque, the rotating shaft that transmits the driving torque for grinding functions as a low-sensitivity torsion bar, and a coiled spring is installed in the high-sensitivity part that detects minute torque fluctuations for the gear elimination function. Since the spring is mounted inside the rim of the power transmission wheel, maintenance and replacement are easy, and the high sensitivity area required for gear rimming and the sensitivity itself can be freely set. It becomes possible.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a torque meter for a grinding machine that covers a commonly used torque range and also has a gap eliminator function with a simple configuration.

Furthermore, a coiled spring is used in the high-sensitivity part that detects minute torque fluctuations for the gear elimination function, and a rotating shaft that functions as a torsion bar is used in the low-sensitivity part that can withstand the torque required during normal grinding. As a result, both torque detection sections work effectively and appropriately for each torque detection in the grinding machine, and the highly sensitive parts that require delicate adjustments and maintenance are placed outside the motor and inside the wheel. It has the characteristics of being easy to handle when used in a grinder.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a grinding machine motor equipped with a torque meter according to the present invention, in which a rotor 2 rotating with respect to a stator 1 is supported by a highly rigid hollow drive shaft 3. A rotary shaft 4 that functions as a low-sensitivity torsion bar is inserted into this drive shaft 3, and is fixed to the hollow drive shaft 3 at its inner end 4a. It is configured to transmit driving torque.

At the outer end 4b of the rotating shaft 4, the rotating shaft 4
A power transmission wheel 5 such as a pulley is provided on the top, and a rotating shaft 4 and a rim 6 of the power transmission wheel 5 are provided.
A coiled spring 7 is interposed between the two and the two for highly sensitive torque detection. The spring 7 has both ends fixed to a spring holding member 9 fixed to the rotating shaft 4 via a sleeve 8 or directly to an engaging member 10 fixed to the rim 6. .

As shown in detail in FIG. 2, the sleeve 8 is provided with driving engaging protrusions 11, 11 projecting around its periphery, while the engaging member 10 is provided with its engaging protrusions 1.
Engagement protrusions 12, 12 for driven engagement that engage with 1, 11
is installed protrudingly. These engaging protrusions 11, 12
After the spring 7 is twisted by the angle θ required to perform the gear eliminator function, the engaging surfaces 11a and 12a engage with each other, thereby directly transmitting the torque from the rotating shaft 4. It is configured such that torque can be directly transmitted to the rim 6 of the power transmission wheel 5 from the engagement protrusion 11 on the sleeve 8 via the engagement member 10, and therefore, when no load is applied, the engagement surface 11a and 12a are kept open by an angle θ as shown in FIG. Note that although 13 in the figure indicates a sliding member, it is not necessarily necessary to provide this.

Rotating shaft 4 that functions as a low-sensitivity torsion bar
The detection device for detecting the torsion angle of the drive shaft 3 and the rotation shaft 4 are equipped with marks 1 such as magnets, respectively.
Detector 2 is equipped with disks 18 and 19 equipped with 6 and 17, and is provided on a fixed part such as a motor housing.
0 and 21, and torque detection is performed based on the time difference between the time points at which the detectors 20 and 21 detect the marks based on the torsion of the rotating shaft 4. Further, a detection device that performs highly sensitive torque detection based on the torsion angle of the spring 7 in a small torque region is provided with a mark 22 such as a magnet on the engaging member 10 or the rim 6 of the power transmission wheel 5, and The marker 22 is detected by a detector 23 provided on a fixed portion of the spring 7, and torque corresponding to the torsion of the spring 7 is detected based on the outputs of this detector 23 and the detector 21. Note that a detection device having another configuration may also be used to detect these torsion angles.

When a torque meter with such a configuration is used in a grinding machine, a small increase in torque just before the grinding wheel contacts the workpiece can be detected by the torsion angle of the spring 7, so the torque meter has a gear elimination function. By holding the grinding wheel, the torque after the grinding wheel contacts the workpiece can be detected by the helix angle of the rotating shaft 4, which covers the commonly used torque range.

3 and 4 show another embodiment of the present invention, in which an engaging member 30 is fixed on the rotating shaft 4 through the sleeve 28 or directly, similar to the embodiment described above. Both ends of the spring 27 are fixed to the engaging member 30 and a spring holding member 29 fixed to the rim 26. Further, as is clear from FIG. 4, driving engagement protrusions 31, 31 are protrudingly provided around the engagement member, and on the other hand, the engagement protrusions 31, 3 are provided on the rim 26.
Engagement protrusions 32, 32 for driven engagement that engage with 1 are provided in a protruding manner. These engaging protrusions 31 and 32 are connected to their engaging surfaces 31 after the spring 27 is twisted by an angle necessary to perform the gear eliminator function.
a, 32a engage with each other, thereby transmitting torque from the rotating shaft 4 directly to the rim 26. The detection device for detecting the torsion angle of the rotating shaft 4 and the spring 27 may be constructed in the same manner as in the previous embodiment.

Therefore, the action of the torque meter in this embodiment is as follows.
There is no substantial difference from the previous embodiment.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the configuration of a grinding machine motor equipped with a torque meter according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a half sectional view of the main part of the example, and is a sectional view taken along line BB in FIG. 3. 3... Drive shaft, 4... Rotating shaft, 5... Power transmission wheel, 6, 26... Rim, 7, 27... Spring, 11, 1
2, 31, 32...Engagement protrusion.

Claims (1)

[Claims] 1 One end of the rotating shaft that functions as a low-sensitivity torsion bar is fixed to one end of the hollow drive shaft of the motor that drives the grindstone rotating shaft, and a power transmission wheel is attached to the other end of the rotating shaft led out through the hollow drive shaft. Inside the rim, a coiled spring is inserted between the rotating shaft and the rim to perform highly sensitive torque detection, and the spring is inserted at only the angle necessary to perform the gear eliminator function. Protruding engagement protrusions that engage after being twisted to directly engage the rotating shaft and the rim, and a detection device that detects the torsion angle of the rotating shaft and the spring as transmitted torque. A torque meter for grinding machines featuring: