JPS6021765Y2 - 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 hole, the hole depth of the workpieces with different machined surface positions is must be inspected alternately, 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, an operation detector such as a limit switch is activated to send an abnormal signal, but if the operation detector malfunctions. If the detector stops operating, it will no longer be possible to send out an abnormal signal, so in order to reliably inspect the hole depth, it is necessary to confirm the operation of the operation detector during the inspection process.

However, none of the conventional apparatuses satisfies these conditions, and the hole depth of various workpieces having different positions on the machined surface cannot be reliably inspected.

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 detecting the hole depth. The purpose is to enable this to be carried out during the hole depth inspection process.

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

In FIG. 1, 10 is guided by a guide shaft 12.13 fixed on the support stand 11, and the processing surface W of the workpiece W is
The measuring head 10 is movable in a direction perpendicular to a, and is attached 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.
They are connected 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 is advanced until the tip of the fixed shaft 18 comes into contact with the processing surface Wa.

Further, a limit switch LS1 for detecting the backward end is provided on the bracket 19 on the support plate 14, and is opened when the inspection head 10 is located at the backward end shown in the figure.

The inspection head 10 has holes 20a to 2 to be inspected whose tip details are formed on the machined surface Wa while the inspection head 10 is moving forward.
A plurality of movable shafts 21 to 24 that are loosely fitted to the hole 0d are mounted on a retractable shaft, and when the depth of the inspected holes 20a to 20d is less than a predetermined depth, the inspection head 10 moves away from the machined surface Wa. Before moving forward to a specific position a certain distance away, the tip detail comes into direct contact with the holes 20a to 20d to be inspected, and the movable shaft 21
24 retreats relative to the inspection head 10.

In addition, the tip of the movable shaft 23 among the movable shafts 21 to 24 is provided with a hole 2 to be inspected after the inspection head 10 passes the specific position.
An engagement end surface 23a that engages around the 0c is formed, and even if the inspection hole 20c is machined to a predetermined depth, the movable shaft 23 is retracted when the inspection head 10 passes a specific position. .

The rear end surfaces of these movable shafts 21 to 24 are mounted on the upper part of the inspection head so as to be movable in a direction perpendicular to the processing surface Wa, and are attached to long shaft bolts 2 fixed to the inspection head 10.
Both abut the lower surface of a movable plate 27 that is pressed toward the machining surface Wa side by a spring 26 contracted at the spring 26, and when any of the movable shafts 21 to 24 retreats, the movable plate 27 is pressed against the spring 26. Retreat against the pressing force.

This movable plate 27 has a bracket 2 on the inspection head 10.
Limit switch LS for depth abnormality detection fixed to 8
An actuating dog 29 is provided for actuating the limit switch LS2, and when the movable plate 27 is retracted, the limit switch LS2 is actuated.

Further, on the side surface 10b of the inspection head 10, there is a limit switch LS3 for detecting the forward end, and an end surface contact part 30a contacts the processing surface Wa during the forward movement of the inspection head 10 and is rotated clockwise. When the measurement head 10 moves forward to a specific position a certain distance away from the processing surface Wa, the limit switch I,
A position detection member 30 that operates S3 is provided.

Therefore, if the hole is less than a predetermined depth, as shown in FIG.
Limit switch LS2 for abnormality detection before is activated.
is activated, and when the hole is at a predetermined depth, as shown in FIG. 3, after the limit switch LS3 for forward end detection is activated, the limit switch LS2 for abnormality detection is activated.

Note that an air nozzle 31 is provided at the tip of the movable shafts 21 to 24 to communicate with the hollow part 10a of the inspection head 10, and supplies compressed air to the hollow chamber 10a while the inspection head 10 is moving forward. Then, compressed air is ejected from the air nozzle 31 to clean the inspection holes 20a to 20d.

Figure 4 shows an electric circuit for detecting an abnormality in the hole depth and an abnormality in the limit switch Ls2 using the device configured as described above, in which the limit switch LS2 is activated when the depth of the hole is shallower than a predetermined value and before the limit switch LS3 is activated. If this occurs, the auxiliary relay CR1 is energized until the limit switch LS3 is activated, and the normally open contact cr i -1 of the relay CR1 is closed, thereby establishing a self-holding state by closing the normally open contact crl-1. The normally closed contact tr of tie 7TR is activated by the operation of the limit switch LS3 for detecting the forward end, and times up after a predetermined period of time.
-1 is closed, the normally closed contact Ls of limit switch ts2
2b is not open, relay CR3, which enters the self-holding state by closing normally open contact tr-1, normally closed contact LS2b, is energized and an abnormality signal indicating an abnormal operation of limit switch LS2 is sent. It is configured to emit.

Therefore, it is possible to prevent the depth inspection from being continued with the limit switch ts2 not operating.

In the above embodiment, the engagement end surface 23a that contacts the processing surface Wa is formed at the tip of the movable shaft 23, and the movable plate 27 is retreated after the inspection head 10 passes a specific position. A separate movable shaft may be provided, the tip end of which contacts the processing surface Wa during the forward movement of the inspection head 10 and causes the movable plate 27 to retreat after the inspection head 10 has passed a specific position.

In addition, in the above embodiment, the intermediate shaft 17 has a machined surface Wa.
A fixed shaft 18 is provided in a protruding manner that abuts on the surface of the machine to correct the forward end position of the inspection head 10 according to the position of the machined surface Wa. However, as shown in FIG. A movable plate 32 whose position is corrected according to the
If the limit switch LS2 is mounted on the inspection head 2, there is no need to correct the forward end position of the inspection head 10 according to the position of the processing surface Wa, and the fixed shaft 18 can be omitted.

In addition, in this embodiment, the movable shaft 3 for retracting the movable plate 32 is
3, it is detected that the inspection head 10 has passed a specific position.

Furthermore, as shown in FIG. 6, a limit switch LS2 is mounted on the movable plate 27, and a rotating plate 35 is provided on the inspection head 10, which presses and operates the lever of the limit switch LS2 from above through a rotating movement. Alternatively, the limit switch ts2 may be activated after the inspection head 10 passes a specific position by rotating the rotating plate 35 by the movable shaft 36 whose tip end surface contacts the processing surface Wa and retreats.

As described above, in the hole depth inspection device of the present invention, the inspection head or movable plate is positioned at a fixed position with respect to the hole processing surface, and the inspection head or movable plate is movable relative to the inspection head and inspected. Since the configuration has an operation detector for detecting the hole depth between the detection movable plate that is moved by the retreat of the first movable shaft that engages the hole, the position in the height direction of the hole machining surface This method has the advantage that the hole depth can be accurately detected even if the numbers are different, and that the hole depths of various workpieces having different machined surface positions can be reliably checked using one device.

In addition, a second movable shaft is provided that makes contact with the hole processing surface and retracts the detection movable plate when the inspection head is at the forward end, so that even when the hole depth is normal, the inspection head is at the forward end. Since the operation detector for detecting hole depth is activated in such a state, there is an advantage that it can be confirmed during the inspection process whether or not the operation detector for detecting hole depth is operating normally.

[Brief explanation of the drawing]

The drawings show an embodiment of the hole depth inspection device according to the present invention, and FIG. 1 is a sectional view showing the first embodiment of the inspection device, and FIG. 2 shows the hole depth abnormality of the device shown in FIG. 1. FIG. 3 is a diagram showing the operating state of the forward end when the hole depth of the device shown in FIG. 1 is normal, and FIG. 4 is a diagram showing the operating state of the device shown in FIG. Fig. 5 is a sectional view showing a second embodiment of the inspection device;
FIG. 6 is a sectional view showing a third embodiment of the inspection device. 10...Inspection head, 15...Cylinder, 20a-20c...Inspection hole, 21-24
, 36...... Movable shaft, 27... Movable plate, 29... Operating dog, 30......
Position detection member, LSl to LS3...Limit switch, W...Workpiece, Wa...Machine surface.

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 position detection member whose abutting portion abuts the hole-machined surface during the forward movement of the inspection head and is displaced as the inspection head moves forward; The hole machining includes a first actuation detector that is activated by the detection member when a specific position is reached, and a movable plate that abuts the hole machining surface and can be independently displaced with respect to the inspection head or the inspection head. a shaft body positioned at a constant position with respect to the surface; a movable detection plate displaceable with respect to the inspection head; and a movable detection plate disposed between the detection movable plate and the inspection head or the movable plate A second actuation detector is activated by a certain amount of retraction of the movable detection plate, and the tip of the inspection head is loosely fitted into the hole to be inspected on the hole-machined surface while the inspection head is moving forward, so that the hole to be inspected is fixed to a predetermined position. If the depth is less than the depth, the first movable shaft contacts the first movable shaft to move the detection movable plate back when the tip is inserted, and the first movable shaft contacts the hole processing surface when the inspection head is located at the forward end. a second movable shaft for retracting the detection operating plate; and a hole depth abnormality determination unit for outputting a depth abnormality signal when the second operation detector is activated before the first operation detector is activated. and a detector abnormality determination circuit that outputs a signal indicating a detector abnormality if the second operation detector does not operate even after the first operation detector is activated. Hole depth inspection device for workpieces.