JP3486291B2 - Replica sampling device for the inside of small holes - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a replica collecting device for investigating the inner surface condition of a small diameter screw hole or a small diameter tube. 2. Description of the Related Art When investigating the surface condition of a screw hole or a pipe by using a replica, it is important that the surface condition is faithfully transferred. For this purpose, a mold for transferring the surface condition is used. It is important to fix the time from when the entire area of the removing agent is pressed with an equal force to when it is hardened. For this reason, conventionally, a link mechanism as shown in FIG. 8 is used. [0003] Referring to Fig. 8, the configuration of a conventional apparatus and its operating method will be described. FIG. 8 is a side view showing a conventional pantograph-type replica collecting apparatus. In the figure, g indicates a screw hole, and h indicates a female screw portion at the tip. First, a support flange 16 is provided above a screw hole g.
And the T-shaped frame 14 is inserted into the screw hole g through the hole. At this time, the kneaded molding agent 17 is applied to the L-shaped plate 18 at the tip of the T-shaped frame 14. When the T-shaped frame 14 can be inserted to a predetermined position, the positioning rod 15 hits the support flange 16 and stops. Then, when the guide rod 19 is pushed in, the guide rod 19 is lowered by the action of the slide mechanism 20 via the stage 21 provided at the distal end thereof, and the parallel link mechanism 22 attached to the distal end of the guide rod is opened to open the female screw. Contact part h. [0007] When the guide rod 19 is further pushed in, the parallel link mechanism 22 and the molding agent 17 push the female thread h against each other. At this time, the set screw of the bearing block 21 arranged above the guide rod is tightened to fix the movement of the guide rod 19. Then, the molding agent 17 is kept as it is.
Just wait for the hardening. The method of detaching the device is as follows.
Loosen the set screw and pull up the guide rod 19. Thereby, the parallel link mechanism 22 is separated from the female thread portion h. Next, the T-shaped frame 14 is twisted with respect to the female screw surface, so that the molding agent 17 which is in close contact with the hardening is peeled off from the female screw portion h. Thus, if the T-shaped frame 14 is pulled up, the molding agent 17 is recovered. The function of the ejection nozzle 23 is to spray methyl alcohol in order to perform replica collection using an acetyl cellulose film when the female thread portion h is on the inner surface of the tube. [0012] In the above-described replica collecting method using the conventional link mechanism, a replica can be reliably collected from a relatively large hole.
There is a concern that the manufacturing cost is increased due to the complexity of the mechanism, and that each component becomes smaller and the strength becomes insufficient as the portion to which the device is applied becomes smaller in diameter. Therefore, in the present invention, as a device for replicating the condition of the inner surface of a hole having a relatively small diameter, the mechanism is simplified and a simple structural member is used in order to eliminate the disadvantages of the conventional device. Accordingly, it is an object of the present invention to provide a new apparatus for collecting a replica of the inner surface of a small-diameter hole, which can reduce the manufacturing cost and has no problem in terms of strength, operability and transferability. According to the present invention, there is provided an apparatus for collecting a replica of an inner surface of a small-diameter hole according to the present invention. In the replica collecting apparatus, a height adjusting screw is provided at the center of the guide body to be inserted into the small-diameter screw hole or the small-diameter tube, and a pad rod is arranged inside the guide body in parallel with the longitudinal direction of the guide body. The pad rod is configured so that the tip and the hand slide up and down in a seesaw shape with the tip of the height adjusting screw as a fulcrum, and further, spring means is provided on the hand side so that the tip of the pad rod always faces upward. The pad rod is constructed by mounting a rubber pad on the tip side of the pad rod, applying a kneading mold to the upper surface of the pad, inserting it into the base near the hand between the guide body and the pad rod, and pulling out the wedge wedge. of When the tip is in a seesaw shape, the molding agent is evenly pressed against the small-diameter screw hole or the inner surface of the small-diameter tube to perform replica sampling of the small-diameter screw hole or the inner surface of the small-diameter tube. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a state in which the device of the present invention is attached to a small-diameter screw hole, and shows a state during molding. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a view showing a state where a kneaded molding agent is applied, and FIG. 4 is a wedge inserted into a hand side before inserting the device into a small diameter screw hole. FIG. 5 is a state diagram in which the apparatus is inserted into a small diameter screw hole. In these figures, reference numeral 1 denotes a guide main body to be inserted into the small-diameter screw hole a, inside which a pad bar 3 is arranged in a longitudinally parallel state as shown in FIG. Reference numeral 2 denotes a height adjusting screw, which is provided at the center of the guide main body 1. The pad rod 3 slides up and down in a seesaw shape inside the guide main body 1 with the tip of the height adjusting screw 2 as a fulcrum. It is configured as follows. A rubber pad 4 is provided on the side of the tip of the pad bar 3.
The rubber pad 4 has an upper surface coated with a kneading molding agent 5. Numeral 6 denotes a rubber ring mounted on the hand side of the apparatus, which is mounted over the base of the guide body 1 and the base of the pad bar 3, so that the tip of the pad bar 3 always faces upward as shown in FIG. I have to. Reference numerals 7 and 8 denote rubber rings for fixing the rubber pad 4 to the upper surface of the pad bar 3. The rubber ring 8 is provided with a V-shaped groove in the rubber pad 4 in order to prevent interference with the inner surface of the small diameter screw hole a. It is configured to fit in this. The reason why the rubber pad 4 is provided between the molding agent 5 and the pad bar 3 is that, in the case of rubber, the length can be adjusted by cutting with a knife or the like according to the depth of the screw hole. The rubber-based resin has good adhesion to each other, which is advantageous for maintaining rigidity and linearity when investigating the cross-sectional shape of the replica. When the apparatus shown in FIG. 1 is attached to the small-diameter screw hole a, the lower surface of the guide body 1 is pressed against the lower surface of the threaded portion b of the small-diameter screw hole. Is applied to the upper surface of the female screw portion b. The force with which the molding agent 5 is pressed against the female thread portion b is generated by a rubber ring 6 attached to the device side, and the force can be adjusted by adjusting the rubber ring 6. In the case of FIG. 1, the height adjusting screw 2 is adjusted so that the upper surface of the rubber pad 4 is evenly pressed against the inner surface of the threaded portion b. 1 and the pad bar 3 are attracted to each other, a lifting force acts on the tip side of the pad bar 3 with the tip of the height adjusting screw as a fulcrum, and the molding agent 5 is evenly pressed against the female screw portion b. . As shown in FIG. 2, the lower surface of the guide body 1 is in contact with the lower surface of the female screw portion b, and the upper surface of the rubber pad 4 fixed to the upper surface of the pad bar 3 is in contact with the upper portion of the female screw b at the quad portion. Further, the molding agent 5 applied to the upper surface of the rubber pad 4 penetrates and fills the screw bottom of the internal thread portion b, and an excess portion of the excess material protrudes from the gap between the upper surface corner portion of the rubber pad 4 and the internal thread portion b. ing. FIG. 3 shows a state in which a molding agent 5 is applied to the apparatus as a preparatory stage. The pad rod 3 is pulled by the rubber ring 6 with the tip of the height adjusting screw 2 as a fulcrum.
And the hand sides contact each other, and the tip side of the pad bar 3 is raised in a seesaw shape. The molding agent 5 is applied on the upper surface of the rubber pad 4 so as to be raised. The height of the upper surface of the rubber pad 4 is adjusted in advance with the height adjusting screw 2 so as to match the inner diameter of the female screw portion 6. FIG. 4 shows a state where the wedge 9 is inserted into the apparatus as the next stage. That is, in the apparatus prepared as shown in FIG. 3, the wedge 9 is inserted between the guide body 1 and the pad bar 3 so as to open the mouth, and conversely, the mouth is closed at the tip side of the apparatus. Upper surface of molding agent 5 and guide body 1
The dimensions connecting the lower surfaces of the screws are small so that insertion into the screw holes is not hindered. FIG. 5 shows a state where the device is inserted into the small diameter screw hole a. That is, the lower surface of the guide body 1 is inserted while sliding on the lower surface of the female screw portion b. On the other hand, on the upper surface of the female screw portion b, the front end of the device is inserted with a sufficient gap, and the insertion is completed without the molding agent 5 touching the female screw b. There is barely a gap on the surface of the hand of the molding agent 5 after the insertion, and even if it touches the surface of the internal thread b, the remaining time only presses the molding agent 5, so there is no problem. When the preparation is completed, when the wedge 9 is pulled out, the apparatus immediately comes to be as shown in FIG. 1, and the molding agent 5 is evenly pressed by the thread portion b, and The excess of the molding material 5 that has penetrated into the screw bottom protrudes, and the device is fixed when the viscosity of the molding material 5 and the pressing force are balanced, and the molding material 5 hardens as time passes. Next, a case where the above-described apparatus of the present invention is applied to a primary facility of a nuclear power plant will be described with reference to FIGS. FIG. 6 is a diagram showing the relationship between primary facilities of a nuclear power plant and FIG. 7 is a sectional view of a steam generator manhole. In FIG. 6, e is a nuclear reactor, f is a pressurizer,
d is a primary coolant pump, c is a steam generator, and 10 is a manhole. In the manhole seat 11 of the manhole part 10 of the steam generator c shown in FIG. 7, 20 small diameter screw holes a (about 40 mm in diameter and about 70 mm in depth) are formed on the circumference. The manhole cover 12 is fastened with bolts 13. Each time a periodic inspection of the power plant is performed,
3 is removed and the manhole cover 12 is opened, but the seizure of the bolt 13 causes thread damage. For the damaged portion of the small diameter screw hole a in the manhole seat 11, replica observation is optimal, and the apparatus is brought to the site to perform replica sampling. The site is a primary system, and the steam generator c
Because the inside of is a high radiation dose area, it is necessary to work in a short time. That is, after applying the molding agent 5 to the upper surface of the rubber pad 4 of the present apparatus, the worker moves his body to the front of the open manhole 10 and inserts the apparatus into the small diameter screw hole a. As soon as it is confirmed that the device is fixed by pulling out the wedge 9, the body is immediately moved away from the front of the manhole 10. The radiation dose is high in front of the open manhole and low when the front opening is avoided. Therefore, the extremely short working time in front of the manhole as in the present apparatus is effective also in the field of radiation exposure reduction. Next, the operation of the apparatus of the present invention will be summarized as follows. That is, in the replica collecting apparatus of the present invention, the height of the rubber pad of the apparatus is adjusted to the inner diameter of the target screw hole by adjusting the height adjusting screw to move the pad rod up and down. Next, a kneading molding agent is applied to the upper surface of the rubber pad, and a wedge is inserted between the pad rod and the guide body so that the molding agent applied to the tip is set inside the inner diameter of the screw hole. So that The device thus set is inserted into the hole, and the wedge on the hand side is pulled out. Then, the tip side of the pad rod slides up and down like a seesaw, and the rubber pad is parallel to the inner surface of the screw hole so that the molding agent is evenly pressed. Since the kneaded molding agent is viscous, the excess molding agent gradually protrudes from the gap between the rubber pad and the inner surface of the hole, but when the pressing force is balanced, the device is moved to the inner surface of the screw hole. It is fixed and the mold hardens over time. As a result, an inner surface replica of a small-diameter screw hole or a small-diameter tube can be sampled under the same conditions without requiring an expert, and the quality of the replica can be stabilized. As described above, in the replica collecting apparatus for the inner surface of a small-diameter hole according to the present invention, a rectangular parallelepiped pad rod is formed in a seesaw shape without using a link mechanism having a complicated mechanism as in the conventional apparatus. The mechanism is simplified and the strength is maintained in place of the means for moving up and down, and the pressing force of the molding agent can be adjusted in advance by the spring mechanism at hand. When collecting the inner surface replica of a diameter pipe, it is possible to collect a replica with the same quality as a relatively large diameter hole, the structure is simple, the manufacturing cost is low, and the strength of each member is reduced because it is composed of simple members. Can be kept enough. Further, in terms of operability, even a simple operation of simply pulling out the wedge can immediately and uniformly press and fix the molding agent, so that no skilled person is required. There are many effects that the quality of the replica can be stabilized because it can be collected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a replica collecting apparatus during a mold according to an example of an embodiment of the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a view showing a state in which a kneaded molding agent is applied. FIG. 4 is a view showing a state in which a wedge is inserted into a hand side before the device is inserted into a small-diameter screw hole. FIG. 5 is a view showing a state where the present apparatus is inserted into a small-diameter screw hole. FIG. 6 is a diagram showing a relationship between primary facilities of a nuclear power plant. FIG. 7 is a cross-sectional view of a steam generator manhole portion to which the present device is applied. FIG. 8 is a side view showing a conventional replica collecting apparatus using a pantograph method. [Description of Signs] a Small-diameter screw hole b Female thread c Steam generator d Primary coolant pump e Reactor f Pressurizer 1 Guide body 2 Height adjusting screw 3 Pad rod 4 Rubber pad 5 Molding agent 6, 7, 8 Rubber ring 9 Wedge 10 Manhole 11 Manhole seat 12 Manhole lid 13 Bolt

Continuation of the front page (56) References JP-A-8-29306 (JP, A) JP-A-4-353740 (JP, A) JP-A-6-102157 (JP, A) JP-A-5-302875 (JP , A) Japanese Utility Model Showa 60-56251 (JP, U) Japanese Utility Model Application Hei 6-40838 (JP, U) Japanese Utility Model Utility Model Hei 3-19952 (JP, U) Japanese Utility Model Utility Model Hei 2-24360 (JP, U) Japanese Utility Model 2-35052 (JP, U) Jiko 6-34673 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 1/00-1/44 JICST file (JOIS)

Claims (1)

(1) A replica body for investigating an inner surface state of a small-diameter screw hole or a small-diameter tube, wherein the guide body is inserted into the small-diameter screw hole or the small-diameter tube. A height adjusting screw is provided at the center of the guide body, and a pad rod is provided inside the guide body in parallel with the longitudinal direction of the guide body, and the pad rod is located close to the tip with the tip of the height adjusting screw as a fulcrum. Is configured to slide up and down in a seesaw shape, further provided with a spring means on the hand side, the tip of the pad rod is configured to always face upward, and a rubber pad is attached to the tip side of the pad rod and kneaded on the upper surface thereof. Applying a molding agent and inserting it into the base near the hand between the guide body and the pad rod and pulling out the wedged wedge, when the tip end of the pad rod rises in a seesaw shape, the molding agent has a small diameter screw hole or narrow hole. Pressed evenly on the inner surface of the diameter pipe Replica pickup device of the small-diameter hole inner surface was characterized by performing replica picking of the small-diameter screw holes or thin tube surface.