JPS6331741Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field of invention The present invention relates to a scraper for cleaning the inside of a pipe.

Technical background of the invention and its problems Conventionally, in pipe cleaning to remove rust and dust from the inner surface of pipelines, a plurality of blades are installed on the outer circumferential surface of the main body that is towed and moved inside the pipe, slanting backwards. A type of scraper is used that scrapes and removes rust and dust from the inner surface of the tube at the tip. Although this type of scraper is effective in discharging dust and grinding the inner surface of the tube, it has the following drawbacks due to its shape.

(i) If there is a large amount of dust or obstruction in front of the vehicle during forward towing, forward towing becomes impossible. At this time, even if you try to pull the pipeline backwards to remove it from inside the pipe, the tip of the blade will get stuck in the gap between the pipe joints, etc., making it impossible to pull the pipeline in the opposite direction.In the end, you will have to cut out the pipeline and take it out, which is extremely inefficient. be. In this case, by creating a structure in which the blade breaks off when an excessive load is applied, it is possible to recover the pipe by reverse traction, but this would require replacing the broken or missing blade when reusing it. Undesirable.

(ii) Since the tip of the blade is at an obtuse angle with respect to the pipe wall surface, if hard dust adheres to the pipe wall, the blade will ride over the dust, so the ability to remove the hard dust is not very good.

Purpose of the invention The invention was made with the aim of eliminating all of the above-mentioned conventional drawbacks.

Structure of the invention The present invention is a scraper of the type that removes deposits by grinding the inner wall of a pipe with the tips of a plurality of blades that are tilted toward the rear on the outer circumferential surface of a main body that is towed and moved inside a pipe. Each blade is provided with a joint part in the center thereof to allow the upper blade part to rotate freely toward the front, and a spring is provided to keep the joint part open at all times. Furthermore, the upper blade part is rotatable forward in the pipe against a spring, and is normally bent forward so that its tip abuts the inner wall of the pipe at an acute angle. related to scrapers.

According to the configuration according to the present invention, during forward traction operation,
Since the tip of the upper blade comes into contact with the inner wall of the pipe at an acute angle, even a hard, adherent dust layer can be reliably abraded and removed without going over it, providing a high level of cleaning performance and also being effective during reverse traction operations. If a resistance that prevents this is applied to the tip of the upper blade part, the upper blade part rotates backwards in the traction direction using the joint as a fulcrum to eliminate this resistance, so if necessary, reverse traction can be performed. By operation, the scraper can be easily taken out from inside the pipe without any breakage or loss of the blade, and after being taken out and collected, it can be ready for the next use as it is.

Embodiment of the invention An embodiment of the invention will be described below based on the accompanying drawings.

As is clear from the overall diagram shown in Figure 1,
The scraper of the present invention comprises a cylindrical main body 1 that is towed and moved within a pipe a, and a number of backwardly inclined blades 2 fixed to the outer peripheral surface of the main body 1. (a) It is constructed so that undesired substances such as rust and dust can be scraped off from the inner surface. This type of scraper itself is publicly known, and the number of blades 2 used and the location of the blades 2 are as follows:
There is no difference at all from the conventional type.

As shown in FIGS. 2-3 and 4, in the present invention, a joint portion 3 is provided at the center of the blade 2, and an upper blade portion 21 is provided above the joint portion 3.
is given the freedom to rotate forward. The joint portion 3 includes a hinge portion 31 that serves as a rotation fulcrum for the upper blade portion 21, and a stopper 32 that prevents the upper blade portion 21 from rotating rearward. Part 2
When the joint part 3 is opened, it comes into contact with the back surface of the lower blade part 22 to prevent further rotation.

Further, the blade 2 is provided with a spring 4 so that the joint 3 is kept open at all times. Second
3 shows a case where a plate spring is used as the spring 4, and FIG. 4 shows a case where a torsion coil spring is used as the spring 4, but the type of the spring 4 and the mounting position are not particularly limited.

Further, the upper blade portion 21 is bent forward so that its tip abuts the inner wall of the tube a at an acute angle. In this case, the tip abutting position against the inner wall of tube a is
If the upper blade part 21 is located on the rear side with respect to the center line of rotation of the joint part 3, the tip of the upper blade part 21 gets stuck on the inner wall of the tube a and cannot be rotated forward, regardless of its ability to rotate forward. , the tip contact position is joint 3
It is necessary to bend the upper blade portion 21 so that it is at a position approximately equal to or slightly forward of the center line of rotation.

As schematically shown in FIG. 5, the scraper A of the present invention is pulled back and forth in a pipe a by pulling a rope c by winches b and b.

As shown by reference numeral 5 in FIG. 6, during the forward traction operation, the tip of the upper blade portion 21 is in contact with the inner wall of the pipe a at an acute angle, and as the scraper moves forward, deposits are removed from the inner wall of the pipe. Since the dust layer d is scraped off, even if the deposit is a hard dust layer d, it can be reliably removed by polishing without going over it. Figure 7 shows the grinding situation of a conventional blade.If the tip of the conventional blade were in contact with the inner wall of the tube a at an obtuse angle, the tip of the blade would cross over the hard dust layer d; dust layer d
cannot be removed by grinding. In FIG. 7, d' is a soft dust layer.

When the scraper is reversely pulled in the direction of the arrow 6 in the state shown in FIG. Since it is in a position to be able to rotate to the side, for example, if the tip of the upper blade part 21 is caught in the groove of the pipe joint part and resistance is applied, the upper blade part 21 will resist the spring 4 and rotate to the rear side. Since the lock is released, such a reverse traction operation can be performed without any problem.

Effects of the invention According to this invention, by making the tip angle of the blade more acute, it is possible to efficiently grind away the stuck dust, significantly improving the cleaning performance, and it is also possible to reverse traction, so if it becomes clogged in the pipe. Even if the blade is removed, it can be easily taken out from inside the pipe without cutting the pipe or causing the blade to break or break, and furthermore, after being taken out and collected, it can be ready for reuse as is. Moreover, it has excellent features such as being able to be taken out at any time by reverse towing, allowing use in multiple connections, and speeding up cleaning work.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged detailed view of the blade section in Fig. 1, Fig. 3 is a developed plan view of the blade section, and Fig. 4 is a modification of the blade section. An enlarged detailed view showing an example, FIG. 5 is a vertical cross-sectional view schematically showing one usage situation of the product of the present invention, and FIG. 6 is a
FIG. 4 is a side view showing the grinding state of the blade section, and FIG. 7 is a side view showing the grinding state of the conventional blade. In the figure, 1 is a main body, 2 is a blade, 21 is an upper blade portion, 22 is a lower blade portion, 3 is a joint portion, 31 is a hinge portion, 32 is a stopper, and 4 is a spring.

Claims (1)

[Scope of utility model registration request] In a scraper of the type that removes deposits by grinding the inner wall of the pipe with the tips of multiple blades tilted toward the rear on the outer peripheral surface of the main body that is moved forward and backward in the pipe, Each blade is provided with a joint in the center thereof to allow the upper blade to rotate freely toward the front, and a spring is provided to keep the joint open at all times. A scraper for cleaning inside a pipe, characterized in that the blade part is rotatable forward in the pipe against a spring, and is usually bent forward so that the tip of the blade comes into contact with the inner wall of the pipe at an acute angle. .