JPH0829309B2 - Pipe scraper - Google Patents

Abstract

PURPOSE: To maintain a hermetic effect by having racial hermetic tongue bodies of an annular shape and roof shape smaller than a scraper body at both ends of a portion having a small diameter. CONSTITUTION: This scraper body consists of coaxial spherical members 12 and 13 and a central constriction part of an area 14. The smallest diameter of the central constriction part of the area 14 is so determined as not to come into contact with the wall surface of the curvilinear part of the smallest pipeline. Columnar parts 15 and 16 exist between the constriction part of the area 14 and the spherical parts 12 and 13. The columnar parts 15 and 16 are internally provided with annular grooves 17 and 18 of a rectangular shape in the cross-section. Annular sealing members 20 and 21 are housed in the annular grooves 17 and 18 and the annular grooves are internally provided with recessed parts 22 and 23 apart a spacing in a circumferential direction. Permanent magnets 24 are housed in the recessed parts 22, and 23 and act as detectors. As a result, a scraping effect is improved.

Description

TECHNICAL FIELD The present invention relates to a scraper for piping.

[Prior Art and its Problems] From German Patent No. 2801378 and the like, a pipe scraper is known as a closure fixed to each end face of an elongated scraper body. The closure comprises a flat, disc-shaped disc with a guide disc provided in the front, a closure disc and a support disc provided behind the closure disc, the guide disc and the support disc comprising a closure It is made of an elastic material that is harder than that of the closed disc that constitutes the.

Such scrapers (although generally made of metal)
Is not suitable for bidirectional operation. It is often needed.

In German Patent No. 3032532, the pipe scraper
It is known to have an annular tubular shape with a gap in the axial direction and a sealing member provided on the scraper body. The scraper body has a waist in the area between the sealing members. With such a scraper body, it is possible to travel in the pipe in either direction, even at narrow bends, without stopping. However, there is a drawback in that if the sealed portion becomes unusable due to wear or damage, the scraper itself must be discarded. The characteristic of this conventional pipe scraper is that the sealing property for improving the scraping effect is due to the same elastic material as the integrally molded scraper body. There are various diameters of the pipe to be scraped, and the pipe may not be smooth due to welding, a flange joint, or the like. Therefore, it will be strongly compressed in the initial stage. Therefore, the scraper body is designed to have high running performance, and it is required that the error in the piping is small, but in most cases, the scraping effect and the sealing effect are reduced.

[Means for Solving the Problems] In view of the present situation as described above, the present inventor has completed the present invention as a result of earnest research, and an object thereof is to provide a scraper for two-way piping. It has high running performance, is well adapted to piping, and has a high scraping effect.

 This object is achieved by the present invention.

The scraping effect of the pipe scraper according to the present invention has a scraping effect that is an annular, radial tongue body (sealing member) located at a slight distance.
Caused by. This tongue is relatively short from the radius of the scraper body. Furthermore, it is designed to deform to about half the height when it contacts the inner wall of the pipe. Therefore, the scraping effect does not occur on the outer surface of the closed tongue, but on the lateral surface and the outer edge of the closed tongue. The size of the sealing tongue should be determined so that it will not be pressed against the wall surface of the pipe. That is, the curved tongue does not come into contact with the scraper body, and the tongue is not deformed in the lateral direction and is not pressed.

The radial height of the closed tongue is about one fifth to one tenth of the radius of the scraper body, but it may be smaller than that.

In one embodiment of the present invention, radial sealing tongues are integrally molded at a distance and an annular sealing / guide member is configured further axially outward, the diameter of which corresponds to the diameter of the pipe The distance between the tongue and the sealing / guiding member is arranged so that it does not come into contact with the sealing / guiding member when the sealing tongue is deformed.

In connection with the axially spaced sealing tongue, the annular sealing / guiding member is substantially guiding and prevents the sealing tongue from being pressed completely.

The pipe scraper of the present invention has various advantages. The elastic deformation of the closed tongue by the inner wall of the pipe produces a force that guides the scraper toward the center in the pipe.
The deviation from the central position causes the spherical portion of the sealing tongue to increase the force that returns the scraper to the central position. The annular sealing / guiding member essentially creates a central displacement force on this surface.

Due to the quick and high elastic force of the sealing tongue on the wall surface of the pipe, a high scraping effect can be obtained even if there are grooves or depressions. The scraping effect automatically and regularly depends on the pressure difference.
That is, the greater the differential pressure, the greater the scraping effect. On the other hand, it is known that the required driving pressure substantially decreases as the contact area with the pipe wall surface decreases. Therefore, if the contact area is small, a small driving force can be moved. This saves drive gas and time for pressure relief.

The life of the scraper according to the present invention is longer than that of the conventional one. Furthermore, the scraper of the present invention is also very excellent in dry operation.

The position of the scraper of the present invention is stable even at the end point because the closed tongue needs to be inverted when changing direction. Because of this, higher initial pressures can be supplied at normal cost, although higher initial pressures are actually required. Stabilizing the scraper position is important. This is because the turbulent flow and other elements that are generated when the scraper is pulled at the end of the turbulent flow generate an auxiliary pressure.

One example of the pipe scraper of the present invention has a scraper body made of an elastic material. The tongue is integrally molded with the scraper body. The size of the scraper body is such that the sealing tongue is equal to or slightly smaller than the medium diameter of the pipe. It is preferably made of plastic.

In yet another example of the invention, the scraper body has at least one annular groove in each of its end areas. Each sealing member is housed in the groove. The annular sealing member is removably attached so that it can be replaced if it becomes worn or damaged.
The sealing member may be embedded in the member of the scraper body at the time of manufacturing. However, even in this case, replacement is not possible.

The annular sealing member is preferably made of a suitable elastic material. However, it may be completely elastic or slightly elastic. For example, PTFE or the like. This is especially the case when a special penetration aid is used. In this case, the spring member housed in the groove of the sealing member or embedded in the sealing member provides the sealing member with a necessary elastic force (elastic force).

In one example of the present invention, the annular groove of the sealing member has a rectangular cross section. However, the annular groove may have a shape in which the lower part is cut off in order to securely hold the sealing member.

The sealing member is closely attached in the annular groove, but can be removed. However, annular fixtures have been used to securely attach the closure to the scraper body. The sealing ring is injected with vulcanized or hardened epoxy resin in order to securely fix the sealing ring to the scraper body.

The emotional sealing member can be composed of an integrally molded ring-shaped or string-shaped body. For this purpose, a steel band, preferably a non-magnetic steel band, is fixed to the inside of the closure by means such as gluing or vulcanization. However, the sealing disc may be located in the groove of the sealing member. The hermetic disc is securely fixed to the scraper body by the fixture.

It may also be desirable for the drive element (gas, etc.) to flow along the scraper. For this reason, the sealing member is provided with at least one radial notch (recess). Alternatively, a brush-shaped sealing member may be used.

A cylindrical permanent magnet may be provided on the center side of the scraper body. On the other hand, in one embodiment of the present invention, at least 1
Two permanent magnets are mounted in a recess at the bottom of the annular groove of the sealing member. If the plurality of permanent magnets are provided at intervals in the circumferential direction, it becomes easy to fix the magnets.

[Examples] The present invention will be described in more detail based on the examples shown in the drawings.

FIG. 1 is a longitudinal sectional view of a piping scraper of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 3 to 19 show various embodiments of the sealing member of the pipe scraper of the present invention. FIG. 20 is a partial cross-sectional view of the piping scraper of the present invention. FIG. 21 shows various embodiments of the sealing member of the pipe scraper shown in FIG. FIG. 22 shows the pipe scraper of the present invention, showing the case where the scraping tongue is in the intermediate position and the case where the scraping tongue is in the deformed position. 23rd
The figure is similar to FIG. 22, but shows the moment when the scraping tongue flips over. FIG. 24 shows still another embodiment of the pipe scraper of the present invention.

In FIGS. 1 and 2, the pipe scraper 10 is composed of a scraper body 11 which is an integrally molded product of an elastic material. From this configuration, the scraper body substantially corresponds to the pipe scraper of DE 3032532. The scraper body is provided in a line symmetrical position,
It is composed of the coaxial spherical members 12, 13 and the central constricted portion of the area 14. The smallest diameter of the central constricted portion of the area 14 is determined so as not to contact the wall surface of the bent portion of the smallest pipe. For example, the diameter may be made slightly smaller than the minimum diameter that does not contact the wall surface. The cylindrical portions 15 and 16 are located between the constricted portion of the area 14 and the spherical portions 12 and 13. In the cylindrical portions 15 and 16, annular grooves 17 and 18 having a rectangular cross section are provided. The center distance between the annular grooves 17 and 18 is smaller than the inner diameter of the pipe to be scraped. The annular sealing members 20, 21 are provided in the annular grooves 17, 18.
Is housed, and details of its structure are shown in FIG. Recesses 22, 23 are provided in the annular groove at intervals in the circumferential direction, and a permanent magnet 24 or other detectable member is housed in the recesses. The permanent magnet 24 under the sealing member 20 is
The N pole is provided so as to be located on the inner side in the radial direction. On the other hand, the permanent magnets on the other side are oppositely provided. Therefore, inside and outside the scraper body 11,
The direction of the electric field is from one row of permanent magnets to the other. The electric field indicates the presence of the scraper and its running in the pipe and is often used as a detector located in the pipe.

From FIG. 3 in particular, the sealing members 20, 21 have a support 25 provided in the cross section of the groove 17 and a shallow groove 26 inside thereof. Further, the supporting portion 25 has an annular groove 28 into which a ring-shaped fixing member 29, for example, a band of plastic or steel, a string of plastic or steel, or the like is inserted radially outward.
have. The purpose of the fixture is to radially retain the annular sealing member 20 in the groove 17. On both sides of the annular groove 28,
Two radial sealing tongues 30, 31 which are axially spaced
Is configured. It has a trapezoidal cross section and a taper that tapers outward in the radial direction. However, it may be tapered in the opposite direction or may be parallel. The line of contact with the pipe wall is shown by the dashed line 32 and the sealing tongues 30, 31 bend nearly 90 degrees. The sealing members 20 and 21 are made of an elastic body, and the scraper 10 can move in both directions.
The sealing tongues 30 and 31 are inverted when turning to a new direction. 4 to 19 show modified examples of the annular groove and the sealing member. They have the same drawing numbers as in FIGS. 1 to 3, but with the addition of letters. The scraper bodies are all similar and have similar drawing numbers 11.

In FIG. 4, the sealing member 20a is housed in an annular groove 17a having a rectangular cross section and a slight conical shape. Further, the member 20a has a support 25a similar to that of FIG. However, there is only one closed tongue 31a,
Its outer shape is similar to the sealing tongues 30 and 31 of FIG. An annular fixture 29a similar to that of FIG. 3 is housed in annular groove 28a. The broken tongue shows the closed tongue 31a.
Is deformed and bent.

In the sealing member 20b of FIG. 5, the support portion 25b is substantially rectangular and has a shallow groove 26b inside. At the center of the support portion 25b, there is one closed tongue 31b having a trapezoidal cross section, which deforms and contacts the pipe inner wall 32. The sealing member 20b is bonded inside the groove 17b.

In FIG. 6, the sealing member 20c looks similar to the sealing member 20b, but the inner surface of the support portion 25c has a dovetail cross section, and the groove 17c is also formed correspondingly. Therefore, the sealing member 20c is cut and accommodated in the groove 17c by cutting the lower part thereof, so that the sealing member 20c is securely held.

In the example of Figure 7, the sealing member 20d is similar to the sealing member of Figures 5 and 6. On the front side, the support part 25d
Has a semicircular cross section and is provided with an annular groove 40 in which an annular fixture 41 is housed. The fixture 41 is also inserted in the annular groove 42 having a semicircular cross section in the wall of the annular groove 17d. As a result, the sealing member 20d is also fixed to the annular groove 17d.

The sealing member 20e shown in FIG. 8 is also similar to that of FIG. Before the sealing member 20e is fixed in the annular groove 17e, the three conducting wires 43 are provided in close proximity to each other and spaced apart from each other. Then, electricity is applied to the conductor. Conductor 43 is a sealing member
20e and the elastic body of the scraper body are crosslinked by electric current. Thereby, the sealing member 20e is prevented from being pulled up.

In the example of FIG. 9, an annular groove 17f having a trapezoidal cross section is provided. The supporting portion 25f of the sealing member 20f is molded so as to correspond to it. The sealing tongue 31f is similar to the sealing tongue 31e in the example of FIG. The sealing member 20f is also securely held in the groove by cutting off the lower end. The sealing member 20f has a recess 44 which communicates with the area 14 outside the scraper body by means of a hole 45. Through the hole 45, plastic material such as epoxy resin,
It is introduced into the recess 44 and cured. Then, the adhesive is surely adhered in the groove 17f.

In the example of FIG. 11, the supporting portion 25g has a stepwise cross section, and has a radially wide portion below.
Therefore, the support part 25g has a groove 1 formed correspondingly.
Securely held at 7g. Similar to the example of FIG. 9, an annular recess
44g is molded so that it can be connected to an area outside the scraper body by a hole 45g.

In the example of FIG. 10, instead of one sealing member at the end of the scraper body, a double sealing member is used.
Annular disks 52, 53 are fitted in closely spaced, narrow grooves 50, 51 on the scraper body, respectively. An annular groove 54 having a triangular cross section is provided in the scraper body between the annular grooves 50 and 51. Fixing tools 55 are radially fitted into the groove and are fitted therein. Its fixture
55 laterally presses the scraper body, thereby tightening the annular discs 52, 53.

The sealing member 20h shown in FIG. 12 is the same as the sealing member 20 shown in FIG. 3, and a detailed description of the structure will not be given. A steel band 46 is fixed to the inside of the sealing member by an adhesive and by crosslinking. The initial shape of the sealing member 20h consists of a long piece of material of a suitable length (such as railroad rails). Within the groove, the ends of the groove are received in contact with the steel band 46 and are secured by suitable means.

In the example of FIG. 13, an annularly molded brush 49 is housed in the groove 17j having a rectangular cross section. The brush 49 is made of a filamentous material and is fixed in the groove 17j by a suitable means.

The cross-sectional shape of the sealing member 20k in FIG. 14 is similar to that in FIG. 12, and therefore will not be described in detail. The difference from the ones already mentioned is that the material is PTFE and it is an inelastic body or shows a slight elasticity. therefore,
The spring member 71, which has a U-shaped cross section, is inserted into the groove 28k and is fixed therein by the fixture 72.
The sealed tongues 30k and 31k obtain elasticity through the spring member 71 when the sealed tongue is deformed.

In the example of FIG. 15, two sealing members having a U-shaped cross section are housed in the groove 17l. The ends of the feet project outside the surface of the scraper body. The sealing members 57 and 58 are both made of PTFE. Therefore, the spring member 59, which is similarly formed in a U-shaped cross section, is located between the sealing members 57 and 58. A spring member 60 having a U-shaped cross section is housed in the sealing member 58. All mounting is done at the same time, spring members
The flat band 61 cooperating with the flat part of the 60 allows the groove 17
stuck inside l The spring members 59, 60 provide elasticity to the normally inelastic sealing members 57, 58.

The annular sealing member 20m of FIG. 16 is the same as the example of FIG. 3 instead of the sealing tongues 30 and 31 shown in FIG.
Two closed tongues 30m and 31m are provided. Each of the sealed tongues is thin and therefore flexible.
The annular fixture 62 is housed in the groove 28m of the support portion 25m.

The sealing member 20n in FIG. 17 has the same structure as the sealing member in FIG. 11 with respect to the lower side. However, the fixation shown in Fig. 11 is impossible. The sealing tongues 30n and 31n have the same structure as that of FIG. A flat fixture 64 is fitted into the slightly wider groove 28n to secure the sealing member 20n in the groove 17n. The band or ring 64 is made of metal. Therefore, the permanent magnet 24 can be replaced by a detector (not shown) in the metal-reacting pipe.

The outer shape of the sealing member 20o in FIG. 18 is as shown in FIG. 3 or FIG.
It is similar to that of FIG. This will not be described in detail. Unlike these embodiments, the spring member 66 is embedded in the sealing member 20o. Sealing member 20o
Is made of PTFE, but the spring member 66 gives it sufficient elasticity.

The structure of the sealing member 20p of FIG. 19 is the same as that of the sealing member 20b of FIG.
The details are not described here. However, the sealing tongue 30p has the passage 70 inclined in the axial direction. This is because the drive gas is caused to flow (pass) along the closed tongue body 30p in order to move the scraper located on the downstream side in the drive direction. Such a plurality of passages 70 are provided at intervals in the circumferential direction.

In the example of FIGS. 20 and 21, the scraper body 111 is made of PTF.
Made of plastic such as E. The outer shape corresponds to the scraper body shown in FIG. However, it is made up of three parts. Scraper body 111
The two end portions 112, 113 provided on the spherical portion of and the inner small portion. If the parts 112, 113 are provided coaxially, an annular groove with a stepped cross section is provided. An annular member 114 is provided between the portions 112 and 113.
Is provided. The member is at least one screw
It is fixed to the parts 112, 113 by 115. Along with the above-mentioned portions 112, 113, 114, grooves 116, 117 having a trapezoidal cross section are provided at the surface end of the scraper body. Its shape is similar to that of the example of FIG. Grooves 116, 1
Inside 17 is a triangular sealing member made of elastic material or PTFE
118 and 119 are provided. As seen on the right side of FIG. 20, the sealing member is pressed against the wall surface of the pipe (indicated by the broken line) to form a cylindrical sealing surface.

FIG. 21 shows two examples of the sealing portion of the sealing member. First
In the upper left diagram of FIG. 21, the sealing member 119a is the sealing member of FIG.
Similar to 119. The hermetically sealed portion is composed of two disc-shaped sealing tongues 121 and 122, the distance of which is the disc-shaped sealing tongue 12 when the pipe wall surface (shown by a broken line) is contacted.
It is the extent that 1, 122 do not touch each other.

In the diagram on the right side of FIG. 21, the sealing member 119b has one sealing tongue 124. This is similar to the sealing tongue 31c, 31d or 31e in the example of FIGS. 6, 7 and 8.
The deformed state of the sealing tongue 124 is shown in the lower right diagram of FIG.

In the example of FIGS. 22 and 23, the scraper body 200
However, it is integrally molded with a closed tongue 204 having a substantially trapezoidal cross section. The sealing tongue 204 is formed in a tapered shape that becomes thinner from the outside toward the inside. Piping is shown at 205. The radial height of the sealing tongue 204 is indicated by Y. It decreases to X when the sealing tongue contacts the inner wall of the pipe and is strongly deformed.

When the scraper 200 is moved in the direction of arrow 206 by the drive means, the pressure of the drive gas acts on the sealing tongue 204. As a result, the tongue is pressed against the pipe 205 in the direction of arrow 207. The pressure of the sealing tongue 204 on the pipe 205 is determined by the pressure difference between the front and the rear of the sealing tongue 204. When the scraper 200 is pulled in the opposite direction, the sealing tongue is in the position shown on the right side of the figure in the unpressurized state.

FIG. 23 shows the moment when the sealing tongue 204 is inverted. That is, the scraper 201 first moves in the direction of arrow 206 and then in the opposite direction. The final complete deformation is ensured by the annular groove indicated at 210.

In FIG. 24, the scraper main body 300 made of an elastic body and integrally molded is similar to the scraper main body of FIG. It has spherical cup-shaped ends 302, 303, the radius of which is equal to or slightly greater than half the length of the scraper body 300. The cylindrical sealing / guide members 301, 304 are configured to contact the members 302, 304. The diameter of this member roughly corresponds to the inner diameter of the pipe. If the scraper body 300 is made of an elastic material, the diameter of the sealing / guide members 301 and 304 may be slightly larger than the inner diameter of the pipe. When the material of the scraper body is relatively hard, the diameter of the sealing / guiding members 301 and 304 should be equal to or slightly smaller than the inner diameter of the pipe. The distance between the annular members 301 and 304 is
Equal to or smaller than the pipe diameter.

Cylindrical portions 306 and 307 are formed in contact with the members 301 and 304, and the diameter thereof is sufficiently smaller than that of the members 301 and 304. The disc-shaped sealing members 308 and 309 are cylindrical portions 306 and 307.
It is located in. They are provided, for example by gluing, in suitable grooves in the parts 306, 307. But,
They may be embedded in the members of the scraper body 300. The sealing members 308 and 309 have sealing tongues 310 and 311 projecting from the cylindrical portion. Closed tongue 31
0 and 311 are selected from the above examples. The height is 1.5 to 2 which is the distance from the cylindrical portions 306 and 307 to the wall surface of the pipe.
It is about twice (preferably 1.6 times). As a result, the sealing tongue is deformed by contact with the wall surface, and as described above, the sealing effect is generated by the end portion and the side surface of the sealing tongue 310, 311.

A space for accommodating the deformed sealing tongue is formed between the members 301 and 304 and the sealing tongue. The distances and widths of the voids 314, 315 are designed so that the sealing tongues 310, 311 do not come into contact with the adjacent parts of the scraper body.

The sealing members 308 and 309 may be made of the same material as the scraper body or a different material. In any case, the flat one is preferable in terms of ease of manufacturing.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a pipe scraper of the present invention,
FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIGS. 3 to 19 are sectional views showing various embodiments of the sealing member of the pipe scraper of the present invention, and FIG. 20 is a pipe of the present invention. Partial sectional view of the scraper, FIG. 21 is a partial sectional view showing various embodiments of the sealing member of the piping scraper shown in FIG. 20, FIG. 22 is a partial sectional view showing the piping scraper of the present invention, 23 FIG. 24 is a partial cross-sectional view showing the moment when the scraping tongue is reversed, and FIG. 24 is a partial cross-sectional view showing still another embodiment of the piping scraper of the present invention. 10 …… Pipe scraper 11 …… Scraper main body 12, 13 …… Spherical member 14 …… Area 15, 16 …… Cylinder 17,18 …… Circular groove 20,21 …… Sealing member 22,23 …… Recess 24 ...... Permanent magnet 25 …… Supporting part 26 …… Shallow groove

Claims (36)

[Claims] 1. At least one annular seal is provided at each end of a portion having a smaller diameter, the distance between the seals being less than or equal to the inner diameter of the tubing, the elongate of a suitable elastic material. In a pipe scraper comprising a scraper body, at least one annular ridge-shaped radial sealed tongue body having a height of 1/5 to 1/10 of the radius of the scraper body is provided at both ends of the portion having the small diameter. And the distance between the scraper body and the pipe wall surface is equal to the height of the tongue.
0.5 to 0.75 times, the sealing tongue can be deformed and bent so that it can contact the inner wall of the pipe, so that the end and the lateral surface of the tongue can contact the inner wall of the pipe even if they are separated from the scraper body. And a radial tongue having a ring shape. 2. A radial sealing tongue body is provided with a distance in the axial direction, is integrally molded, and has an annular sealing and / or guiding member on the outside, the diameter of which corresponds approximately to the inner diameter of the pipe and sealing. The distance between the tongue and the sealing / guiding member is such that at least the sealing tongue does not come into contact with the sealing / guiding member when it deforms, and its height is 1.5 times the distance from the tubular portion to the inner wall of the pipe. The scraper for piping according to claim 1, wherein the scraper is about 2.0 times. 3. The pipe scraper according to claim 2, wherein the ring-shaped space is provided between the annular sealing and / or guiding member and the sealing tongue. 4. The height of the closed tongue is such that the nominal diameter of the pipe is 50 to 50.
It is 3 to 5 mm with respect to 80 mm, and increases slightly for larger diameters.
Scraper for piping according to the item. 5. The pipe scraper according to claim 1, claim 2, claim 3, or claim 4, wherein the closed tongue is integrally molded with the scraper body. 6. The pipe scraper according to claim 5, wherein the scraper body is made of an elastic body having a relatively high hardness. 7. The sealing tongue is constructed separately from the annular sealing member and is fitted in the annular groove of the scraper body, as claimed in claim 1, claim 2, claim 3 or claim 7. Four
Scraper for piping according to the item. 8. The scraper for piping according to claim 7, wherein the sealing member is provided so as to be detachable from the annular groove. 9. The pipe scraper according to claim 7, wherein the annular sealing member is made of an elastic material. 10. The pipe scraper according to claim 7, wherein the sealing member has a ring-shaped disk shape. 11. The pipe scraper according to claim 8, wherein the annular sealing member is manufactured by being embedded in the material of the scraper main body at the time of manufacturing, preferably by casting. 12. The pipe scraper according to claim 1, wherein two or more sealing tongues are provided side by side so that they do not come into contact with each other even if deformation occurs due to the pipes. . 13. The pipe scraper according to claim 7, wherein the annular groove has a rectangular cross section. 14. The annular groove is undercut (cut down).
The scraper for piping according to claim 7, which has been prepared. 15. The pipe scraper according to claim 7, wherein a shallow groove is provided on the inner side of the sealing member. 16. The annular sealing member has a peripheral groove into which an annular fixing member is inserted, and preferably has a diameter smaller than the outer diameter of the adjacent portion of the scraper body. The scraper for piping according to item 7. 17. The sealing member has a peripheral groove on the front surface thereof, and the groove accommodates a fixing member which cooperates with the groove provided on the wall surface of the scraper body. Scraper for piping according to the item. 18. At least one wire comprises:
The pipe scraper according to claim 7, which is provided in the scraper body between the annular sealing member and the bottom of the annular groove. 19. The sealing member according to claim 7, wherein the sealing member has an annular space on its inner side, and the space is connected to the outside of the scraper body by at least one passage. Scraper for piping. 20. The pipe scraper according to claim 7, wherein the support portion of the sealing member inserted into the annular groove is axially expanded more than the sealing member. 21. The scraper body located between two adjacent annular discs has a fixing groove, which is tapered inwardly and into which an annular fixing member is inserted. A scraper for piping according to claim 10. 22. The scraper for piping according to claim 1, wherein a metal band, preferably non-magnetic steel, is fixed to the inside of the annular sealing member. 23. The sealing member according to claim 1, wherein the sealing member is composed of a slight or non-elastic member, and the spring member cooperates with the sealing member to thereby hold them in a neutral position. Scraper for piping. 24. A spring member having a U-shaped cross section is located in the groove, and a foot portion of the spring cooperates with an inner side of the sealing portion. Term,
The scraper for piping according to the 18th, 19th, 20th, 21st, 22nd, or 23rd paragraph. 25. There are two sealing members of U-shaped cross section, one of which is fitted into the other and wholly located in the annular groove of the scraper body, one of which is a U-shaped spring member. Claims 16 to 17, which are located between the sealing members, claim 17, claim 18, claim 19, claim 20, claim 21,
The scraper for piping according to Item 22 or Item 23. 26. The pipe scraper according to claim 23, wherein the U-shaped spring member is provided in the sealing member. 27. The pipe scraper according to claim 1, wherein at least one recess is provided around the closed tongue. 28. A thickness according to claim 1, wherein the thickness of the sealing tongue continuously decreases radially outward.
Scraper for piping according to the item. 29. The thickness of the sealing tongue continuously increases outward in the radial direction.
Scraper for piping according to the item. 30. The pipe scraper according to claim 1, wherein the closed tongue has a perfect annular shape. 31. The pipe scraper according to claim 7, wherein the sealing member is formed of a string-like material, and the ends thereof overlap or abut. 32. The pipe scraper according to claim 7, wherein the scraper body is formed by integrally molding an elastic material. 33. The scraper body comprises two axially symmetric ends and a central part surrounding a connecting portion of the ends,
The pipe scraper according to claim 7, wherein a groove for the sealing member is provided between the central portion and one of the end portions. 34. The pipe scraper according to claim 7, wherein the bottom of said housing groove is provided with at least one recess in which a permanent magnet is housed. 35. The method according to claim 34, wherein the plurality of permanent magnets are inserted in both of the annular grooves so that a magnetic field can be generated between the grooves outside the scraper body. Pipe scraper. 36. The pipe scraper according to claim 35, wherein the permanent magnet is embedded in a member of the scraper body, preferably by casting.