JPH09127064A - Device for detecting flaw of valve seat of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately adjust the position of a probe for an inspection surface even if a valve seat is exchanged. SOLUTION: A vertical post 17 is provided at one side edge of a horizontal stand plate 14 so that it can be rotated around a vertical shaft and can rise and fall and the base edge of a horizontal arm 21 directed toward the other side edge of the stand plate is provided at the upper edge of the post 17 so that it can travel in the longitudinal direction. A stopping means 15 is provided to stop the horizontal arm 21 when the horizontal arm 21 faces in the direction in which it matched with the center of a valve seat 1 to be measured being retained at the other side edge on the stand plate 14, at the lower portion of the post 17 and a probe 10 for eddy current flaw detection being inclined at a specific angle in a direction where a lower edge leaves the post 17 is provided at the loose edge of the horizontal arm 21 so that it can travel obliquely up and down toward the inspection surface of the valve seat 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flaw detection device capable of easily inspecting an internal defect in a face portion of a valve seat.

[0002]

2. Description of the Related Art FIG. 4 shows a valve seat (1) which is used by being fitted to a cylinder head of an engine. A face portion (2) inclined at 45 ° is repeatedly hit by an engine valve. Since they come into contact with each other, wear-resistant stellite or the like is built up. Such a valve seat is inspected by an eddy current flaw detector because the strength and the airtightness are impaired when an internal defect is generated in the inner wall portion.

FIG. 3 shows a conventional flaw detector, in which a known magnetic stand (4) stands at the right end of the upper surface of a horizontal base plate (3). The mounting cylinder (7) fixed to the base end of the arm (6) inclined to the lower left by 45 ° is fitted on the upper end of the column (5) so that the arm (6) can be moved up and down. It can be fixed at a desired height by the first set screw (8) screwed to the mounting cylinder (7).

A pivot support (9) is externally fitted to the tip of the arm (6) so as to be movable along the arm (6), and a well-known eddy current flaw detector is mounted on the upper end of the pivot support (9). Probe (body not shown)
The upper end of (10) is pivotally attached by a second set screw (11) so as to be vertically rotatable.

A flat V block (12) is fixed to the left end of the upper surface of the base plate (3) by a screw (13) so that the horizontal position can be adjusted. Using the device described above, the face portion of the valve seat (1)
When starting the flaw detection of (2), set the valve seat (1) to V block (12).
The probe (10) with the valve seat (1).
The height of the arm (6) and the arm of the probe (10) should face the face part (2) of the
(6) After adjusting the above positions and fixing each part, operate the eddy current flaw detector and manually rotate the valve seat (1) to detect the entire circumference of the face part (2). You can

[0006]

In the above-mentioned conventional device, the probe (10) or the arm (6) of the probe (10) or the arm (6) is replaced every time when the valve seat (1) is replaced with a new one or when different sizes are inspected. Since it is necessary to change the position and the angle, the operation is troublesome, and it takes time to readjust the position of the probe (10) with respect to the valve seat (1) again, resulting in poor work efficiency.

The present invention has been made in order to solve the above-mentioned problems, and even if the valve seat is replaced, the position of the probe with respect to the inspection surface can be easily and accurately adjusted. It is intended to provide a valve seat flaw detector of

[0008]

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a vertical pillar at one end of a horizontal base plate.
The base end of a horizontal arm that is rotatable about a vertical axis and can be moved up and down and that faces the other end of the base plate is provided at the upper end of the column so as to be movable in the length direction. Is provided with stop means for stopping when it is oriented in the direction aligned with the center of the valve seat to be measured held at the other end on the base plate, and at the free end of the horizontal arm, the lower end is in the direction away from the column. A probe for eddy current flaw detection that tilts at a specified angle
This is solved by providing the valve seat so as to be movable in an obliquely vertical direction toward the inspection surface.

[0009]

1 and 2 show an embodiment of the present invention. The same members as those in the conventional example described above are designated by the same reference numerals and the description thereof will be omitted.

A V block (12) similar to that described above is fixed to the left end of the upper surface of a base plate (14) corresponding to a conventional base plate by a screw (13) so that the left and right positions can be adjusted.

On the right end face of the base plate (14), a stopper (15) as will be described later is fixed upward and a pivot hole (16) penetrating the right end of the base plate (14). The upright support columns (17)
A small diameter part (17a) at the lower end of the is pivotally fitted so as to be vertically movable.

At the lower end of the large diameter portion (17b) of the column (17), a base plate
The support ring (18) abutting on the upper surface of (14) is externally fitted, and the first bolt (19) screwed into a proper position on the outer peripheral surface of the support ring (18) keeps the support pillar (1
It is firmly fixed to 7). A support cylinder (20) facing laterally is fixed to the upper end surface of the large diameter portion (17b).

The support cylinder (20) has a horizontal arm (2
The right end (base end) of 1) is slidably fitted and fixed by a second bolt (22) screwed into the rear surface of the support cylinder (20).
When the horizontal arm (21) rotates counterclockwise in plan view and aligns with the center of the V block (12), the first bolt (19) comes into contact with the stopper (15).

At the left end of the horizontal arm (21), there is formed a forked part (21a) separated into front and rear two pieces by a notch groove whose left end is open. The probe (10) is vertically slidably inserted into the inclined hole (23) that is inclined by 3 degrees, and the probe (10) has a third bolt (24) screwed into the left end of the bifurcated portion (21a). It is fixed by.

In the apparatus of the above-mentioned embodiment, when the inspection of the valve seat is started, the probe (10) together with the support column (17) and the horizontal arm (21) is slightly pulled up and rotated clockwise so that the probe (10) is rotated. ) Is retracted from above the V block (12), and the valve seat (1) to be flaw-detected is pushed into the V block (12).

Then, again the column (17) and the horizontal arm (21)
At the same time, while slightly lowering the probe (10), the probe (10) is rotated counterclockwise until the first bolt (19) contacts the stopper (15). As a result, the tip of the probe (10) is attached to the valve seat (1).
Align on the center line that divides

At this time, the height of the tip of the probe (10) depends on the valve seat.
If the face (2) of (1) is not appropriate, operate the third bolt (24) to adjust the height of the probe (10) and operate the second bolt (22). , The probe (10) is moved to the left and adjusted so that its tip is separated from the face portion (2) by a predetermined dimension.

When the flaw detection is completed, the horizontal arm (21) is slightly raised and rotated to replace the next valve seat (1), and the flaw detection is similarly performed, so that a large number of valve seats (1) are sequentially inspected. be able to.

[0019]

According to the present invention, the valve seat can be easily replaced only by rotating the probe while pulling the probe together with the support column and the horizontal arm, and the stopping means can be used during the inspection. Since the position of the probe can be accurately re-set by, the workability is greatly improved.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of a conventional device.

FIG. 4 is a central longitudinal front view of a valve seat.

[Explanation of symbols]

 (1) Valve seat (2) Face part (3) Base plate (4) Magnetic stand (5) Strut (6) Arm (7) Mounting tube (8) First set screw (9) Pivot tool (10) Probe (11) Second set screw (12) V block (13) Screw (14) Base plate (15) Stopper (16) Pivot hole (17) Strut (17a) Small diameter part (17b) Large diameter part (18) Support ring (19) First bolt (20) Support cylinder (21) Horizontal arm (21a) Two-pronged part (22) Second bolt (23) Inclined hole (24) Third bolt

Claims (1)

[Claims] 1. A vertical pillar is provided at one end of a horizontal base plate so as to be rotatable about a vertical axis and capable of moving up and down.
At the upper end of the pillar, the base end of the horizontal arm facing the other end of the base plate,
Stop means is provided in the lower part of the support column so as to be movable in the length direction, and is stopped when the horizontal arm is oriented in the direction aligned with the center of the valve seat to be measured held at the other end on the base plate. A probe for eddy current flaw detection, which is provided at the free end of the horizontal arm and whose lower end is inclined at a predetermined angle in a direction away from the support, is provided so as to be movable in an obliquely vertical direction toward the inspection surface of the valve seat. Engine valve seat flaw detector.