JPH046869Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a pipe cleaning scraper.

Conventional technology and its problems Conventionally, it was possible to tow in two directions, forward and reverse.
During forward pulling operation, the tip of the blade is pressed against the inner surface of the pipe to polish and remove rust, dust, and other deposits inside the pipe, and during reverse pulling operation, the tip of the blade is free from the inner surface of the pipe, making it easier than inside the pipe. A scraper for cleaning inside pipes that can be pulled out and collected has been proposed (for example, Japanese Utility Model Application No. 60-189385).

However, this kind of conventional scraper has a structure in which the joint part opens and closes against a spring, so it is structurally complex and the operation is uncertain, and the spring in the joint part quickly loses its springiness. The problem was that the properties decreased or disappeared, resulting in a lack of durability.

The present invention was made with the aim of eliminating these conventional problems.

Means for Solving the Problems The present invention is provided with a movable member that can move back and forth within a predetermined allowable width in front of the central axis of a scraper body installed in a pipe, and the movable member includes , a plurality of rearwardly inclined elastic blades are provided at appropriate intervals in the circumferential direction of the conduit and are rotatable in the radial direction of the conduit using the base end pivot as a fulcrum; On the central axis on the rear side of the end pivot,
The present invention relates to a pipe cleaning scraper characterized in that a fixing member is provided for abutting against the back surface of the blade and supporting the blade in a predetermined inclined state.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is the central axis of the scraper main body A installed in the pipe a, and a disk-shaped movable member 2 is freely fitted in the front part of the central axis 1 at the central boss part 2a. has been done. This movable member 2 is connected to the central axis 1
At the top, the head 1a is screwed to the front end of the central shaft 1, and the step 1b formed at the rear of the central shaft 1 prevents the head from coming out. It is designed to be able to move forward and backward between the equal head 1a and the stepped portion 1b. 3 is a key for locking the movable member 2 relative to the central axis 1;

A rearwardly inclined elastic blade 5 is attached to the periphery of the movable member 2 via a U-shaped fitting 4 so as to be rotatable in the radial direction of the conduit a with the base end pivot 5a as a fulcrum. A plurality of blades 5, for example 12 blades, are provided on the periphery of the movable member 2 at equal intervals in the circumferential direction of the conduit a. The blade 5 includes a spring plate portion 5b and a scraping blade portion 5c provided at the tip of the spring plate portion 5b, and the base end of the spring plate portion 5b is bent into a U-shape. The base end pivot portion 5 is attached to the hinge metal fitting 6 fixed in the component portion _5b1.
The hinge pin of a is inserted through it.

A disk-shaped fixing member 7 for supporting the blade 5 at a predetermined angle by abutting against the back surface of the blade 5 is provided on the central axis 1 on the rear side of the base end pivot portion 5a of the blade 5 as a central boss portion. It is fitted and fixed at 7a. The fixing member 7 has a rearwardly inclined receiving surface 7b on its outer peripheral edge, and receives the back surface of the curved portion _5b1 of the blade 5 on the receiving surface 7b.

As shown by the imaginary line in FIG. 1, when the movable member 2 is in the retracted position, the fixed member 7 has a blade portion 5c at the tip of the blade 5 whose radius is slightly larger than the radius of the conduit a. On the other hand, when it is in the forward position, it is designed to support the back surface of the blade 5 in a relationship that is slightly smaller than the radius of the conduit a, as shown in FIG.

A steady rest ring 8 is fixed on the front side of the outer circumference of the fixing member 7, and the folded part 5b ₁ ' of the curved part 5b ₁ of the blade 5 is inserted through the hole 8a of the ring 8 to provide a steady rest. has been done.

In order to restrain the movable member 5 in the retracted position, a ball stopper 9 is formed on the center boss portion 5a of the member 5, and a groove 10 for locking the ball 9a is formed on the central shaft 1 at a position opposite to the stopper 9. has been done. 9b
is a spring for pressing the ball 9a.

In addition, in the drawing, reference numeral 11 designates a connecting portion to a normal traction member provided at the front end of the head 1a, and 12 represents a connecting portion to a reverse traction member provided at the rear end of the central shaft 1. Incidentally, the scraper main body A may be used by connecting a plurality of scrapers via a universal joint.

FIG. 1 shows the state when the movable member 2 is in the retracted position.
The state of the blade 5 is shown. In this state, the blade portion 5c at the tip of the blade 5 has a radius slightly larger than the conduit a, as shown by the imaginary line in FIG. When the scraper main body A is installed in the conduit a, the blade 5 deforms in the direction of decreasing the radius against the retained elasticity as shown by the solid line in FIG. a It is pressed against the inner surface. Therefore, by moving the scraper main body A forward in the conduit a in the state shown by the solid lines in FIG.

During the forward traction movement of the scraper body A in the pipe a,
Since the movable member 2 always maintains the retracted position due to the resistance inside the pipe, it is not particularly necessary to apply restraining means such as the ball stopper 9. Since movement along the axis 1 is dangerous, it is preferable to make it possible to restrain the movable member 2 in the retracted position by applying a pole stop collar 9 or the like.

On the other hand, when the scraper main body A is reversely pulled inside the pipe a, the blade 5 and hence the movable member 2 are subjected to resistance within the pipe, whereas the center shaft 1 is not substantially subjected to resistance within the pipe. first moves in the reverse traction direction, and as a result, the movable member 2 moves to the forward position. Even if the ball stopper 10 is provided, the resistance in the pipe against the blade 5 is overwhelmingly greater than the restraint force by the ball stopper 10, so the ball stopper 9 can easily come off from the groove 10 by reverse traction, and the movable member Release the constraint on 2.

When the movable member 2 moves forward, the blade 5 rotates about the base pivot 5a as a fulcrum in a direction that reduces the inclination angle, as shown in FIG. It is smaller than that of pipe a. By pulling the scraper body A in the reverse direction, the scraper body A can be easily recovered from the inside of the pipe a.

Effects As described above, the scraper of the present invention can stably and reliably clean the inner surface of the pipe by the forward traction operation, and collect material from the inside of the pipe by the reverse traction operation. In particular, during reverse traction operation, the radius of the tip end portion 5c of the blade 5 can be reduced by moving the movable member 2 along the central axis 1, so the operation is easy. , which has the feature of ensuring stable operation over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention during forward traction operation, Fig. 2 is a longitudinal sectional view during reverse traction operation, Fig. 3 is a plan view of the U-shaped metal fittings, and Fig. 4. is the first
FIG. 5 is a partial sectional view taken along the line .about. in FIG. 1. In the figure, 1 is a central shaft, 2 is a movable member, 3 is a key, 4 is a U-shaped hardware, 5 is a blade, 6 is a hinge hardware, 7 is a fixed member, 8 is a ring, and 9 is a ball stopper. .

Claims (1)

[Scope of utility model registration request] A movable member that can move forward and backward within a predetermined allowable width is provided in front of the central axis of the scraper body installed in the conduit, and the movable member has a pivot point at the base end of the conduit. A plurality of radially rotatable rearwardly inclined elastic blades are provided at appropriate intervals in the circumferential direction of the conduit, and on a central axis rearward from the proximal pivot of the blades, A pipe cleaning scraper characterized in that a fixing member is provided for abutting against the back surface of the blade and supporting the blade in a predetermined inclined state.