JPS5929389B2 - Overload detection device - Google Patents

Description

Detailed Description of the Invention The present invention provides a feed mechanism in which a grindstone or the like for grinding the inner surface of a welding groove is provided on an object to be fed by a feed screw, and the object is moved by rotation of the feed screw. The present invention relates to an overload detection device that detects an overload applied to a grindstone due to a failure or the like, that is, an overload applied to a conveyed object, and the object is to easily detect it with a simple configuration.

Next, the present invention will be explained in detail with reference to drawings showing one embodiment thereof.

In the drawing, 1 is a bottom plate of a copying unit of a groove internal polishing device, 2 is a drive motor fixed above the bottom plate 1 by a mounting body 3 integrated with the bottom plate 1, and 4 is a rotating shaft 2' of the drive motor 2.
The motor-side pulley 5 is fixed to the upper surface of the bottom plate 1, and is located below the drive motor 2, with a mounting through hole 6 in the side plate 5' of the bracket 5. It is formed.

T is a magnetic powder clutch attached to a bracket 5, and a flange 8' is formed on the outer periphery of a cylindrical fixed body 8 forming the outside of the clutch T, and the left end of the fixed body 8 has a through hole 6 for mounting.
At the same time, the collar 8' is inserted into the side plate 5 of the bracket 5.
'Abutted and bolted. Reference numeral 9 denotes a substantially cylindrical clutch input shaft rotatably provided inside the fixed body 8 via bearings 10, 10, and a cross section L communicating with the inner surface of the input shaft 9 is provided in the peripheral wall of the input shaft 9. A letter-shaped groove 9' is formed.

11 is a substantially annular clutch input pulley that is integrally attached to the left end of the input shaft 9; 12 is a timing belt such as a chain 5 that connects both pulleys 4 and 11; The input shaft s is connected via the motor side pulley 4, the timing belt 12, and the clutch input side pulley 11.
transmitted to.

Reference numeral 13 denotes a clutch output shaft rotatably supported at the center inside the input shaft 9 via bearings 14, 14, and 15 denotes a groove 9' of the input shaft 9 integrally provided on the outer periphery of the output shaft 13. The clutch auxiliary body is loosely inserted into the clutch auxiliary body, and magnetic powder T' that hardens by the generation of a magnetic field is interposed between the outer periphery of the output shaft 13 and the inner periphery of the input shaft 9 and within the groove 9'.

Reference numeral 16 denotes a magnetic field generating coil provided on the inner periphery of the fixed body 8 of the magnetic powder f5 clutch T. When the coil 16 is energized, a magnetic field is generated inside the clutch □, and the magnetic powder 7' It solidifies, and both shafts 9 and 13 become one body, and in this state, both shafts 9 and 13 are slipped by a constant torque.

17 is a clutch-side sun gear fixed to the left end of the output shaft 13; 18 is a sun gear 1 meshed with the sun gear 17;
The rotation shaft 18' of the gear 18 is rotatably supported by a planetary gear bearing 19 on the outer periphery of the input shaft 9 via the clutch input pulley 11. There is.

20 is an inverted L-shaped detector mounting bracket fixed to the left end of the bottom plate 1; 21 is a rotation angle detector fixed to the side plate 20' of the bracket 20;
2 is located on an extension of the output shaft 13.

23 is a detector-side sun gear fixed to the end of the detection shaft 22, and 24 is a detector-side planet fixed to the end of the rotation shaft 18' of the clutch-side planetary gear 18 and meshed with the detector-side sun gear 23. A planetary gear train 25 is composed of both sun gears 17, 23 and both planetary gears 18, 24.
26 is a clutch-side transmission gear fixed to the right end of the output shaft 13, 27 is a feed screw rotatably supported by supports 28, 28 whose both ends are fixed on the bottom plate 1, and 29 is a feed screw. A feed side transmission gear fixed to the left shaft end of the screw 27 and meshed with the clutch side transmission gear 26; 30 is the feed screw 27;
A grindstone (not shown) for grinding the inner surface of the right groove is rotatably provided on the upper surface of the sent object 30, and is moved by the rotation of the feed screw 27. As the feeder 30 moves, the inner surface of the groove is sequentially polished.

In addition, each gear 17, 18, 23 of the planetary gear train 25,
Between 24 and 24, if the number of teeth of each gear 17, 18, 23, 24 is D, d, Yj, d', then D/d>D7d.
The following is a description of the operation of the above embodiment.

When feeding the object 30, first, the magnetic field generating coil 16 is energized to connect the clutch output shaft 13 and the clutch input shaft 9 together. When the drive motor 2 is driven to rotate the rotary shaft 21, the rotation of the rotary shaft 2' is transmitted to the input shaft 9 via the motor side brake 4, timing pet 12, and clutch input side pulley 11. , furthermore, the rotation of this input shaft 9 causes the magnetic powder 7 solidified by the magnetic field to
' to the output shaft 13, and both transmission gears 26, 29
is transmitted to the feed screw 27 via. Therefore, the rotation of the feed screw 27 causes the object 30 to be sent to the right. At this time, in the planetary gear train 25, the input shaft 9 and the output shaft 13 are integrated as described above, so the clutch-side planetary gear 18 maintains a constant meshing state with the clutch-side sun gear 17. rotates around the sun gear 17, without the rotating shaft 18' rotating relative to the planetary gear bearing 19, that is, without rotating the rotating shaft 18'itself;
Therefore, the rotating shaft 18 rotates together with the input shaft 9.
Since the detector-side planetary gear 24 at the end of ' is also rotated together with the input shaft 9 without rotating, the detector-side sun gear 23 that meshes with the planetary gear 24 maintains its meshing state and inputs data. The detection shaft 22 is rotated in the same direction as the shaft 9. The rotation of the detection shaft 22 is equal to the rotation of the input shaft 9 and is proportional to the rotation of the feed screw 27.
7 is proportional to the rotation of the detection shaft 22, and the rotation angle detector 21 detects the amount of feed of the object 30. For example, if the grindstone comes into contact with the bottom surface of the groove-shaped groove inner surface and an overload is applied to the object 30, the feeding of the object 30 by the rotation of the feed screw 27 is prohibited, and the rotation of the feed screw 27 is prohibited. Since rotation is stopped,
The output shaft 13 slips relative to the input shaft 9 and is stopped.

Therefore, since the rotation of the clutch side sun gear 17 is also stopped, the rotating shaft 18', which rotates around the axis center of the output shaft 13 together with the input shaft 9, is in contact with the sun gear 17 of the clutch side planetary gear 18. Due to the meshing, the input shaft 9 rotates in a direction opposite to the rotation direction of the input shaft 9. The rotation of the rotating shaft 18' itself is simultaneously transmitted to the detector-side planetary gear 24, and the planetary gear 24 rotates around the detector-side sun gear 23 while rotating. Here, each gear 17, 18 of the planetary gear train 25,
With the number of teeth 23 and 24, there is a relationship of D/d>D7d', so the sun gear 23 meshing with the planetary gear 24 rotates in the opposite direction to the rotation direction of the input shaft 9. Then, the detection shaft 22 is also rotated in the opposite direction, whereby the detector 21 detects an overload on the object 30 to be transported. At this time,
In the rotation angle detector 21, by arbitrarily setting the reverse rotation angle when the detection shaft 22 shifts from normal rotation to reverse rotation, the output response time of the overload detection signal from the detector 21 can be freely adjusted. 0 In other words, the time from when an overload is applied to the object to be sent 30 until the overload detection signal is output from the detector 21 is determined by the time when the normal forward rotation of the detection shaft 22 is disturbed and the rotation shifts to reverse rotation. It can be determined by the reverse rotation angle when Therefore, according to the embodiment, since the input and output shafts 9 and 13 are integrated during normal feeding of the object 30, the amount of feed of the object 30 due to the rotation of the feed screw 27 and the amount of feed due to the planetary gear train 25 are different. The rotation of the detection shaft 22 can be made proportional to the rotation of the detection shaft 22, and if the feed screw 27 needs to be provided with a feed amount detector, the rotation angle detector 21 can be used to detect the feed amount.

In addition, when an overload is applied to the sent object 30, the output shaft 1
3 slips with respect to the input shaft 9, the planetary gear train 2
5, the detection shaft 22 can be rotated in the opposite direction to the input shaft 9, and overload can be detected by the detector 21. Furthermore, the timing of overload detection can be determined by the reverse rotation angle of the detection shaft 22, e.g. Depending on the purpose of use, the overload may continue for a certain amount of time, and then the next When moving to operation, the determination time can be freely adjusted, and the overload detection signal from the detector 21 can be widely applied. moreover,
In the embodiment described above, even if there is a small obstacle on the inner surface of the groove, the overload can be detected by the detector 21 when the grinding wheel reaches the obstacle, and effective detection is performed in polishing the inner surface of the groove. As described above, according to the overload detection device of the present invention, the input shaft rotated by the motor, the feed screw that moves the sent object by rotation, and the output shaft that rotates the feed screw by rotation. a clutch provided between the two shafts that causes the output shaft to slip with respect to the input shaft due to an overload of the object to be transported; and a rotation angle for detecting an overload of the object to be transported based on the rotational direction of the detection shaft. By comprising a detector and a planetary gear train connected between the input shaft and the output shaft and reversing the direction of rotation of the detection shaft when the clutch slips, it is possible to detect the feed with a simple configuration. Body overload can be easily detected, and by setting the reverse rotation angle of the detection axis arbitrarily, the overload detection judgment time can be adjusted, allowing overload to be detected in a timely manner. .

[Brief explanation of the drawing]

The drawings show one embodiment of the overload detection device of the present invention, in which FIG. 1 is a partially cutaway front view, and FIG. 2 is a partially cutaway simplified front view of the main part. 2... Motor, 7... Magnetic powder clutch, 9... Clutch input shaft, 13...
Clutch output shaft, 21...Rotation angle detector, 22
...Detection axis, 25 ... Planetary gear train, 2
7...Feed screw, 30...Feed object.

Claims (1)

[Claims] 1. An input shaft that is rotated by a motor, a feed screw that moves the object to be sent by rotation, an output shaft that rotates the feed screw by rotation, and an input shaft that is provided between the two shafts and that moves the object to be sent by rotation. a clutch that causes the output shaft to slip with respect to the input shaft; a rotation angle detector that detects an overload on the sent object based on the rotational direction of the detection shaft; and a rotation angle detector that is connected between the input shaft and the output shaft. An overload detection device comprising: a planetary gear train for reversing the rotational direction of the detection shaft when the clutch slips.