JPS6021764Y2 - Hole depth inspection device for workpiece - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hole depth inspection device for inspecting the depth of a hole formed in a workpiece.

On a machining line that alternately processes various types of workpieces that have the same depth and arrangement of holes to be machined, but differ only in the position of the machined surface in the depth direction of the holes, The depth must be inspected, and such a machining line requires a hole depth inspection device that can inspect the depth of the hole regardless of the position of the machined surface of the workpiece.

In addition, in general hole depth inspection equipment, if the depth of the hole is shallower than a predetermined value, a limit switch is activated to send out an abnormal signal, but if the limit switch does not operate due to a failure, an abnormality occurs. Since the signal is no longer sent, it is necessary to check whether the limit switch operates during the inspection process in order to reliably inspect the hole depth.

However, none of the conventional hole depth inspection apparatuses satisfies these conditions, and it has not been possible to reliably inspect the hole depth of various workpieces having different positions on the machined surface.

The present invention was developed in view of these conventional problems, and allows the hole depth to be inspected with the same device regardless of the position of the machined surface, as well as to confirm the operation of the operation detector for determining the hole depth. The purpose of this is to enable the measurement to be carried out with the inspection head in its original position.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 10 denotes an inspection head movably guided by a guide shaft 12.13 fixed on a support base 11 in a direction perpendicular to the processing surface Wa of the workpiece W. The inspection head 10 is connected to an output shaft 16 of a cylinder 15 fixed to the upper part of a guide shaft 12.13 via a support plate 14.
is connected to via an intermediate shaft 17.

A fixed shaft 18 is provided at the tip of the intermediate shaft 17 so as to penetrate through the inspection head 10 and project toward the processing surface Wa side.
The inspection head 10 is advanced until the tip of the fixed shaft 18 comes into contact with the processing surface Wa.

Note that the limit switch LSI fixed to the bracket 19 on the support plate 14 is a second operation detector that detects the retreat of the inspection head 10.

The inspection head 10 includes a pair of end face detection shafts 21 and 22 to which a first movable plate 20 is fixed to the upper end, and
When 0 is located at the forward end, the plurality of inspection shafts 24 whose tips are loosely fitted into the inspection holes 23a to 23d formed in the processed surface Wa
27 are guided and supported so as to be slidable in the axial direction.

A flange that contacts the upper surface of the inspection head 10 is protrudingly provided on the upper outer peripheral surface of the inspection shafts 24 to 27, and the upper ends of the inspection shafts 24 to 27 are moved by an intermediate shaft 17 in a direction perpendicular to the processing surface Wa. A protrusion is provided which abuts the second movable plate 28, which can be guided.

The air nozzles opened at the lower end surfaces of the inspection shafts 24 to 27 communicate with the hollow chamber 10a of the inspection head 10.
Chips from the machined hole are removed using the air supplied to 0a.

Further, a long-axis bolt 29 that passes through the second movable plate 28 is fixed to the upper surface of the inspection head 10, and a first spring 30 that presses the second movable plate 28 toward the processing surface Wa side is compressed by the bolt 29. It is set up.

As a result, if the holes 23a to 23d to be inspected are at the correct depth, even if the inspection head 10 moves forward to the detection position as shown in FIG. Only when any of the holes 23a to 23d to be inspected are shallow without retracting from the
The movable plate 28 is retracted.

On the other hand, the inspection head 1 is located above the end face detection shafts 21 and 22.
A stopper 31 that comes into contact with the top surface of 0 and restricts the descending end (advance end) of the end face detection shafts 21 and 22 is fixed, and the end portion has a flange formed on the end face detection shafts 21 and 22 and a measuring head. A second spring 33 is compressed and abuts against the lower surface of the second spring 10 and presses the end face detection shafts 21 and 22 toward the processing surface Wa.

Further, when the end face detection shafts 21 and 22 are located at the forward end, the tips of the end face detection shafts 21 and 22 are closer to the processing surface W than the fixed shaft 18.
It protrudes toward the a side.

As a result, when the inspection head 10 is located at the backward end, the stopper 31 moves forward until it comes into contact with the upper surface of the inspection head 1o, the first movable plate 20 is positioned at the forward end, and the inspection head 10 is at the forward end. When located at , the end face detection axis 21.22
The tip touches the processing surface Wa and retreats, and the first movable plate 20
is retracted against the pressing force of the spring 33 to a position a certain distance away from the processing surface.

A limit switch LS2, which is a first operation detector for detecting depth abnormalities in the inspected holes 23a to 23d, is fixed to the first movable plate 20 via a bracket 34. An actuation dog 35 is attached to actuate the limit switches r and s2.

This actuating dog 35 is connected to the first movable plate 20 and the second movable plate 2.
8 are both at the original position (advanced end) and the first
When the second movable plate 28 moves back while the movable plate 20 is retreating, the limit switch LS2 is activated, and the limit switch LS2 is placed in a position such that it is inactivated only when only the first movable plate 20 moves back. It is provided.

Therefore, the limit switch LS2
It is operated not only when any one of a to 23d is shallower than the specified value, but also when the inspection head 10 retreats to the retreat end.

Further, on the bracket 36 on the inspection head 10, there is a limit switch LS for confirming the forward end, which serves as a third operation detector.
3 is provided, and when the inspection head 10 moves to the forward end and the end face detection shaft 22 retreats, it is operated by a dog 37 provided on the end face detection shaft 22.

FIG. 3 shows an electric circuit for inspecting hole depth using the device configured as described above, in which the inspection head 10 is activated when the limit switch LS3 is activated and the normally open contacts Ls3a of the limit switches i and s3 are closed. When the position is at the forward end, limit switch LS2 is activated and limit switch LS2 is activated.
When the normally open contact Ls2a is closed, the relay CR20 is energized to send out an abnormal signal indicating that the depth is abnormal, and the limit switch LSI is activated and the limit switch LSI is normally open. When the contact LSla is closed, that is, when the inspection head 10 is located at the backward end, if the limit switch LS2 is not activated and the normally closed contacts LS2b of the limit switches I and S2 are closed, the relay CR21 is energized to send out an abnormality signal indicating that the limit switch LS2 is abnormal.

Therefore, it is possible to prevent the depth inspection from being continued with the limit switch LS2 not operating.

In the above embodiment, the limit switch LS2 for detecting depth abnormality was provided on the first movable plate 20, but the limit switch LS2 was provided on the second movable plate 28, and the operating dog 35 was provided on the first movable plate 20. It may be provided.

Further, as shown in FIG. 4, an operating dog 35 is provided above the lever of the limit switch LS2, and the limit switch LS2 is activated when the first movable plate 20 returns to the forward end and when the second movable plate 28 retreats. It may be made inactive.

Further, in the embodiment described above, the inspection head 1 is rotated until the fixed shaft 18 protruding from the intermediate shaft 17 comes into contact with the processing surface Wa.
0 was advanced to correct the forward end positions of the inspection axes 24 to 27 according to the position of the processing surface Wa, but the fifth
As shown in the figure, the stoppers 31 of the end face detection shafts 21 and 22
A movable plate 38 is provided which engages with and whose position is corrected according to the position of the processing surface Wa.
27 is regulated, and the second
If a stopper 39 is provided to restrict the lowering end of the movable plate 28, the fixed shaft 18 may not be provided.

Furthermore, if the limit switch LS2 is provided on the movable plate 38, the movable plate 20 may be eliminated.

As described above, in the hole depth inspection device of the present invention, the first movable plate is positioned at a constant position with respect to the hole processing surface when the inspection head moves to the forward end, and The structure has an operation detector for detecting the hole depth between the second movable plate, which is movable relative to the second movable plate and is moved by the retreat of the inspection shaft that enters the hole to be inspected. The hole depth can be detected accurately even if the positions in the height direction of the holes are different, and there is an advantage that the hole depth of various workpieces that are machined at the same position can be reliably confirmed with one device.

In addition, the first movable plate is moved forward by the spring force until the operation detector for hole depth detection is activated during the process of the inspection head returning to the retreating end, so that the operation detector for hole depth detection is activated. There is an advantage in that it is possible to check whether the inspection head is operating normally while it is in its original position.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of a hole depth inspection device showing the first embodiment, and FIG. 2 is a diagram showing the state in which the inspection head 10 in FIG. FIG. 3 is a diagram showing an electric circuit for inspecting hole depth using the device shown in FIG. 1, FIG. 4 is a diagram showing another example of how the operating dog 35 shown in FIG. FIG. 5 is a sectional view of a hole depth inspection device showing a second embodiment. 10...Inspection head, 12, 13...
Guide shaft, 15...Cylinder, 16...
Output shaft, 20...first movable plate, 21.22...
・End face detection axis, 23a to 23d... Hole to be inspected,
24-27...Measurement axis, 28...Second
Movable plate, 30. 33...Spring, 35.
...Operating dog, LS1 to LS3...Limit switch, W...Workpiece.

Claims (1)

[Scope of utility model registration request] an inspection head that moves forward and backward relative to the hole machining surface of the workpiece;
A first movable plate and a second movable plate are provided on the inspection head so as to be movable in the moving direction of the inspection head at different positions in the moving direction of the inspection head, and a hole is formed at the forward end of the inspection head. an end surface detection shaft that abuts the machined surface and positions the first movable plate located at the rear of the first and second movable plates at a position corresponding to the position of the hole machined surface; and the second movable plate. A first spring and a stopper means for retractably positioning the plate, and when the inspection head moves to the forward end, the tip part is loosely fitted into the hole to be inspected formed in the hole machined surface, and the hole to be inspected is fixed to a predetermined position. an inspection shaft whose tip portion abuts the bottom surface of the hole to be inspected and causes the second movable plate to retreat against the pressing force of the first spring; a first operation detector disposed between the two movable plates and detecting when the distance between the two movable plates has become less than a predetermined value; a second spring that advances the first movable plate to a position where the instrument is activated; second and third actuation detectors that respectively detect the backward and forward ends of the inspection head; and the second actuation detector. a detector abnormality determination circuit that determines a detector abnormality when the first operation detector does not operate when the third operation detector is activated; A hole depth inspection device for a workpiece, comprising a hole depth abnormality determination circuit that determines a depth abnormality.