JPH0548129Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a water level holding device for a flaw detection water tank in an ultrasonic flaw detection apparatus that uses, for example, a local water immersion method for pipe rods.

(Prior Art) Conventionally, as a water level holding means for this type of flaw detection water tank, a rubber seal B having an arcuate notch A along the outer periphery of the material to be inspected as shown in FIG. This was done by attaching them freely and replacing them. Note that a plurality of radial notches C are provided in the arcuate notch A of the rubber seal B so as to accommodate slight changes in the outer diameter of the material to be inspected.

(Problem to be solved by the invention) However, in the conventional water level holding method using the rubber seal B as described above, depending on the outer diameter of the material to be inspected when changing the size of the material to be inspected, the There was a problem that rubber seal B had to be replaced. That is, in the conventional water level maintenance method, it is necessary to prepare many rubber seals B with different radii of the circular notch A, which leads to complicated parts management.

In addition, the conventional method requires operator intervention, which takes time during setup change and is one of the factors that hinders automation.

Therefore, the present applicant, in collaboration with other companies, proposed a water level holding device capable of solving the above-mentioned drawbacks in Utility Model Application No. 170028/1984 (Patent Application No. 84559/1988).

This water level holding device includes a guide mechanism that guides the vertical movement of the draining plate, an elastic member that is built into the guide mechanism to always position the draining plate upward, and the guide mechanism that is disposed before and after the flaw detection water tank. It is composed of a connecting rod that pivotally connects both draining plates, whose vertical movement is guided by a . Although this is an invention, according to subsequent experiments by the present applicant, when the tip of the material to be inspected is spirally conveyed while swinging around due to the bend in the tip of the material to be inspected,
It has become clear that there is a problem in which the tip of the material to be inspected collides with the drain plate on the exit side and stops, making it impossible to continue the flaw detection.

The present invention was developed in view of the above-mentioned problems, and even when the tip of the material to be inspected is being conveyed in a spiral while swinging around due to bending,
To provide a water level holding device that prevents the tip of a material to be inspected from colliding with a draining plate on the outlet side and being able to maintain the water level in a flaw detection water tank with the same draining plate regardless of the size of the inspected material. It is.

(Means for solving the problem) The present invention is to raise the flaw detection tank after the tip of the spirally conveyed material to be inspected passes through the front wall position of the flaw detection water tank, so that the lower surface of the material to be inspected A device that is installed on the front and rear walls of a flaw detection water tank in a device that performs ultrasonic flaw detection while immersed in flaw detection water, and that maintains the water level in the flaw detection water tank, and is slightly larger than the outer diameter of the maximum tested material. A draining plate having an arcuate concave portion in diameter, an elastic member that urges the draining plate to be always positioned upward, and both draining plates disposed at the front and rear of the flaw detection water tank are pushed together with the biasing force of the elastic member. It is equipped with a connecting rod that is integrally pivotally connected to allow vertical movement, and a restraining mechanism that restricts the lateral movement of both draining plates when vertically moving. The gist is that the drain plate is rotatably attached, and that a biasing mechanism is specially provided to keep the drain plate in an upright state at all times.

(Function) In the water level holding device according to the present invention, the draining plate is always positioned at the uppermost position by the urging force of the elastic member and the weight of the connecting rod.

Then, at the time of inspection, that is, immediately after the material to be inspected is spirally conveyed and its tip passes the front wall position of the flaw detection water tank, the flaw detection water tank is raised to a predetermined height to bring it into contact with the material to be tested. As the flaw detection water tank rises, the drain plate on the front wall side is pushed down by the material to be inspected and is pushed down against the biasing force of the elastic member and the weight of the connecting rod. The water level is maintained corresponding to the lower surface of the tank.

At this time, due to the action of the connecting rod, the draining plate on the exit side installed on the rear wall is also pushed down to the same height position, and the tip of the advancing object to be inspected is connected to the draining plate on the exit side. to prevent collisions. Even if the tip of the material to be inspected moves forward while swinging around due to bending, and even if the tip collides with the drain plate on the outlet side, the water level holding device of the present invention will The drainage plate on the exit side is tilted in the direction of movement of the material to be inspected against the biasing force of the biasing mechanism to allow the progress of the material to be inspected, so flaw detection can be continued without any support. In addition, after the tip of the material to be inspected passes through the tilted drainage board on the exit side,
It is restored by the urging force of the urging mechanism.

Next, during flaw detection, the drain plates on the inlet and outlet sides quickly follow the positional changes of the lower surface of the inspected material due to eccentricity and eccentricity due to the biasing force of the elastic member.
Maintains the water level in the flaw detection tank.

Note that when the flaw detection water tank is lowered and separated from the material to be inspected after the inspection is completed, the weight of the connecting rod and the elastic member cause both the drain plates on the inlet and outlet sides to rise back to their original positions.

(Example) The present invention will be described below based on an example shown in FIGS. 1 to 3.

FIG. 1 is a plan view showing an embodiment of the water level holding device according to the present invention, and FIGS. 2 and 3 are drawings showing the main parts thereof.

In the drawings, reference numeral 1 denotes a flaw detection water tank, and a water level holding device according to the present invention is disposed on the front and rear walls of the flaw detection water tank 1.

Reference numeral 2 designates a drain plate made of, for example, nylon mold resin, having an arc-shaped recess 3 whose radius of curvature is slightly larger than the outer diameter of the material to be inspected. support plate 4
It is always positioned upward due to the bending moment generated by the biasing force of an elastic member 5 such as a spring and the weight of the connecting rod 8, which will be described later. In the figure, 6 is a bolt for adjusting the biasing force of the elastic member 5, and 7 is a lock nut.

8 is the support plate 4 arranged in front and behind the flaw detection water tank 1
The connecting rod 8 is a connecting rod which integrally connects the two support plates 4, 4, and the approximate centers of the front and rear bent parts 9, 9 of the connecting rod 8 are pivotally attached to the front and rear walls of the flaw detection tank 1, and the support plates 4, 4 are connected to the tips of the bent parts 9, 9, thereby allowing the skid plates 2, 2 held by the support plates 4, 4 to move up and down integrally. The weight of the connecting rod 8 is determined so that due to interaction with the biasing force of the elastic member 5, both support plates 4, 4 and both skid plates 2, 2 are normally in the upper position, and are pushed down only when they come into contact with the material to be tested.

Reference numeral 10 denotes a restraining mechanism for restricting horizontal movement of the draining plate 2 when the draining plate 2 moves up and down, and in this embodiment, a parallel link mechanism is used. However, the structure of this restraint mechanism 10 is not limited in any way as long as it restrains extreme lateral movement of the draining plate 2 while allowing smooth vertical movement. It may also be configured such that it is guided by guide members provided on both sides thereof.

By the way, in the water level holding device according to the present invention, the drain plate 2 on the inlet side is fixed to the support plate 4 as shown in FIG. 2 A to B, but the drain plate 2 on the outlet side As shown in Figure 3 A to C,
It is pivotally attached to the support plate 4 (its pivot point is 4a) so that it can freely rotate by a required angle outward, that is, in the direction in which the material to be inspected travels. It is maintained in an upright state at all times by the built-in slide tube 13.

Therefore, in the case of the water level holding device according to the present invention, when the tip of the material to be inspected is being conveyed in a spiral while swinging around due to bending, and when the tip collides with the draining plate 2 on the outlet side, Even if the drain plate 2 on the outlet side is tilted in the direction of movement of the inspected material against the spring force of the biasing mechanism 11, the drain plate 2 will not be damaged and the drain plate 2 will not be damaged. Since progress is not stopped, flaw detection can continue normally. Note that after the tip of the material to be inspected passes through the drain plate 2 on the exit side, the spring force of the biasing mechanism 11 causes the drain plate 2 to return to its original upright state. Furthermore, if the drain plate on the outlet side is tilted, the water level in the flaw detection tank will drop momentarily, but normally water for flaw detection is continuously supplied to the flaw detection tank, so the drain plate on the outlet side will drop. Needless to say, by returning to the original position through the action of the force mechanism, the water level will immediately reach the predetermined level.

Although not shown in the drawings, slits are provided in the support plate 4 and the like to prevent scale from accumulating on the material to be inspected, and overflowing testing water washes away the scale to prevent it from accumulating.

(Effects of the invention) As explained above, the water level holding device according to the invention makes it possible to maintain the water level in the flaw detection water tank with the same draining plate regardless of the size of the material to be inspected, and also covers the draining plate on the outlet side. Since it is configured so that it can be tilted in the direction in which the inspection material travels, there is no need to prepare multiple types of rubber seals as in the past.
Even materials to be inspected with curved tips can be detected without any difficulty.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the water level holding device according to the present invention. Figure 1 is an overall plan view, Figure 2 shows the main part on the inlet side, and Figure 3 shows the main part on the outlet side. A is a side view, B is a front view, and
FIG. 3C is an explanatory diagram of the biasing mechanism, and FIG. 4 is a front view of a conventional rubber seal. 1 is a flaw detection water tank, 2 is a draining plate, 3 is an arc-shaped recess, 5 is an elastic member, 8 is a connecting rod, 10 is a restraining mechanism, and 11 is a biasing mechanism.

Claims (1)

[Scope of utility model registration request] After the tip of the spirally conveyed material to be inspected passes the front wall of a flaw detection water tank, the flaw detection water tank is raised and the lower surface of the material to be inspected is immersed in the flaw detection water, and the device performs ultrasonic flaw detection. A device disposed on the front and rear walls of a flaw detection water tank to maintain the water level in the flaw detection water tank, the drain plate having an arcuate recess with a diameter slightly larger than the outer diameter of the maximum tested material;
An elastic member that urges the draining plate to be always positioned upward, and both draining plates disposed at the front and rear of the flaw detection water tank are pivotally connected together so that they can freely move up and down together by levering together with the urging force of the elastic member. a connecting rod and a restraining mechanism for restricting lateral movement of both draining plates during vertical movement;
A flaw detection water level holding device for an ultrasonic flaw detection device, characterized in that a biasing mechanism is specially provided to keep the drain plate in an upright state at all times.