JPH01184090A - Stopper for cleaning inside of pipe and production thereof - Google Patents

Abstract

PURPOSE:To prevent detachment of pins driven into the solid cylindrical main body of a stopper for cleaning the inside of a pipeline by providing nonpartible projections to the middle parts of the shaft parts excepting the tips of the pins consisting of the shaft parts and the head parts. CONSTITUTION:In a stopper 1 propelled in a pipe by fluid pressure which has been inserted into the pipe, the solid cylindrical main body 2 is formed by a rigid elastic material (e.g. high-density urethane foam). Furthermore many pins 3 made of rigid material whose head parts 6 remain on the outer peripheral face of the main body 2 are driven toward the direction of the center line of the cylinder at the intervals with each other from the outer periphery of the main body 2. The nonpartible projections 5 are provided to the middle parts of the shaft parts 4 excepting the tips of the pins 3 consisting of the shaft parts 4 and the head parts 6. As a result, detachment of the pins driven into the solid cylindrical main body of the stopper for cleaning the inside of a pipeline can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stopper for removing substances attached to the inner wall of a pipeline and a method for manufacturing the same.

1J"L and on the inner wall of the pipeline, there are substances such as corrosive substances and sediments (hereinafter referred to as scale) depending on the type of fluid being transferred.
scale tends to adhere, and the longer the pipeline, the more difficult it becomes to remove the scale. Mechanical and chemical methods are known as general methods for removing scale attached to the inner walls of pipelines, which involve disassembling the pipeline into short lengths. The work of performing and reassembling is extremely troublesome and requires a large amount of expense. The solution to this problem is to insert a cleaning plug (commonly known as a vig) into the pipe and allow the fluid to pass through the pipe.

The cleaning stopper is made of a compressible material (elastic material) and has a large number of hard protrusions on its circumferential surface that can come into contact with scale and remove the scale, making it different from other cleaning stoppers. The body is made of a compressible material (elastic material), and the surrounding surface is an abrasive material made of a hard material with wear resistance.
For example, sand, iron powder.

Ceramic grains) are dispersed and buried. By sequentially inserting and passing a plurality of these cleaning plugs into the pipeline, scale can be effectively peeled off and removed.

Figures 21 and 22 show an example of a plug 01 for cleaning inside a pipe. The plug body 01 includes a solid cylindrical body 02 formed of a hard elastic material (a material that compressively deforms under pressure and curves along the bend of the pipeline, but is not excessively flexible); A large number of wear-resistant hard materials (harder than scale, but The pin 03 is made of a material that is softer than pipe material. Pin 03 is plug body 01
While passing through the pipeline, the head 05 scratches the scale and receives a reaction force, so it must be driven sufficiently deep into the main body 02, and a large diameter part 04 is provided to prevent it from coming off. is formed at the tip. However,
Since the large diameter portions 04 at the tips of a large number of pins 03 are gathered at the center of the main body 02, the large diameter portions 04 interfere with each other, and a repulsive force is generated between each pin 03 and the main body 02
There is a problem in that the central part of the pins 03 becomes weak and the holding force against the pins 03 becomes small, making it easy for each pin 03 to come out.

Another problem with the plug 01 is that the head 05 wears. In particular, when the scale adhered to the inner wall of the pipeline is hard, the head 05 that makes direct frictional contact with the scale is likely to wear out during repeated use of the plug 01, and the sharp corner edges that are most effective in removing scale are likely to wear out. This will cause the performance of the plug body 01 to deteriorate. It seems like it would be good to replace the pin 03 with a worn head 05, but since the large diameter part 04 that prevents it from coming out gets in the way and the pin 03 cannot be pulled out, the entire plug body 01 must be discarded. This is not only uneconomical, but also undesirable from the perspective of saving resources.

On the other hand, if the holding force of the main body 02 against the pin 03 is not sufficient, there is a problem that the pin 03, which comes into frictional contact with the scale while the plug body 01 travels in the pipeline, separates from the main body 02.

In addition to the plugs shown in Figs. 21 and 22, the plugs for cleaning the inside of the pipe may be made of sand, iron powder, ceramic particles, ceramic fibers, etc. in the outer peripheral surface layer of the base made of a hard elastic material without a driving pin. As mentioned above, there is a structure in which hard abrasive material is dispersed and buried. In such a plug, when the hard elastic material @ base wears out with use,
There is a drawback that the abrasive material easily falls off and the scale removal performance deteriorates early.

Pipelines that have been used for a long time without being cleaned have thick and firmly adhered scales, for example,
The hole of a 0 am pipe may have an inner diameter of about 10 to 20 mm. In order to remove such a large amount of strongly adhered scale, a variety of plugs with slightly different outer diameters are used, and each plug, ranging from small diameter to large diameter, is fed into the pipeline in sequence. It will be run. In addition,
Depending on the hardness of the scale, many plugs with the same outer diameter may be used.

Conventionally, many types of plugs with different outer diameters are molded using separate molds, which makes the manufacturing process complicated and requires the preparation of a large number of molds. This caused an increase in production costs.

. The first object of the present invention is to prevent the pin driven into the solid cylindrical body of the pipeline cleaning plug from detaching.

A second object of the present invention is to solve the problem of the head of a pin driven into the solid cylindrical body of a pipe cleaning plug being worn out due to use, and to create a plug that can be used without premature disposal. It is to provide.

A third object of the present invention is to suppress detachment of the abrasive material dispersed and embedded in the outer circumferential surface layer of the base of the pipe cleaning plug.

A fourth object of the present invention is to efficiently obtain various types of plugs having different outer diameters at a low cost.

The first purpose is to provide a plug that is inserted into a pipe and propelled through the pipe by fluid pressure;
A solid cylindrical body made of a hard elastic material, and a large number of holes that are driven from the outer periphery of the body toward the center line of the cylinder at intervals, and whose heads remain on the outer circumferential surface of the body. In a plug for cleaning the inside of a pipe consisting of a pin made of a hard material, by providing a protrusion to prevent the pin from coming off at the middle part of the shaft, excluding the tip of the pin, which consists of the shaft and the head, or by inserting it into the pipe. The stopper is propelled through a pipe by fluid pressure in a state in which the stopper has a solid cylindrical body made of a hard elastic material, and a body that is spaced apart from the outer periphery of the body in the direction of the center line of the cylinder. A method for manufacturing a plug for cleaning inside a pipe comprising a large number of pins made of a hard material that are driven in and whose heads are left on the outer circumferential surface of the main body. The base of a breakable cartridge containing an adhesive is inserted into the hollow portion at the tip of the shaft portion, and the pin is driven into a pin driving hole previously formed in the solid cylindrical body. The pin is irremovably fixed by destroying the cartridge due to contact with the bottom of the pin driving hole and filling the space between the circumferential wall of the pin driving hole and the pin with adhesive leaked from the cartridge. achieved by

The second purpose is (1) to form a pin that is driven into the solid cylindrical body of the stopper, and to form the head of the pin, which consists of a shaft and a head, with a plurality of mutually stepped portions of different diameters; By making the side adjacent to the shaft a large diameter and the rear end side a small diameter,
Alternatively, (2) this can be accomplished by connecting the head of the pin, which consists of a shaft and a head, to the shaft in an exchangeable manner.

The third object is to provide a plug for cleaning inside a pipe, which is a solid cylindrical body made of an elastic material that is propelled through the pipe by fluid pressure while being fitted into the pipe. This is achieved by dispersing and embedding irregularly shaped abrasive pieces made of wear-resistant hard material.

The fourth purpose is to mold the material of the solid cylindrical body using a long mold, cut the obtained long material into specified dimensions, and cut it into the specified shape.

Achieved by finishing to size.

FIG. 1 shows a side view of a plug 1 for cleaning inside a pipe. The plug body 1 includes a solid cylindrical body 2 formed of a compressible and bendable hard elastic material (e.g., high-density foamed polyurethane), and a body 2 that is spaced apart from each other from the outer periphery toward the center line of the cylinder. The head 6 is left on the outer peripheral surface of the main body 2 by a large number of wear-resistant hard materials (harder than scale and softer than pipe, hard resin, etc.) It consists of a pin 3 made of (material) (Fig. 1,
Figure 2). A pair of retaining protrusions 5 are protruded from the shaft portion 4 of the pin 30 and are located midway in the length direction and are inclined toward the head 6 (FIG. 3). This retaining protrusion 5 allows the pin 3 to be driven into the main body 2, but prevents the pin 3 from moving in the opposite direction within the main body 2.

In the pin 3 having such a structure, since the retaining protrusion 5 is provided protruding from the intermediate portion of the shaft portion 4 instead of the tip portion,
The tips of the pins 3 driven toward the center of the main body 2 do not interfere with each other, and the pins 3 are driven sufficiently deep and are securely held by the main body 2. Therefore, even if a force is continuously or repeatedly applied to the pin 3 due to the contact relationship between the head 6 and the scale while the plug body 1 travels in the pipeline, the pin 3 is unlikely to come off.

FIG. 4 shows a pin 3A according to a modification. Pin 3A
is provided with three pairs of retaining protrusions 5A similar to the retaining protrusions 5 at the intermediate portion in the length direction of the shaft portion 4A, and has a large resistance to movement toward the withdrawal side with respect to the main body 2.

J-11 FIG. 5 is a new view showing only the main parts of the pipe cleaning plug 7. The plug body 7 is a structure formed by driving a large number of wear-resistant hard material pins 9 into a solid cylindrical body 8 made of a hard elastic material like the plug body 1. pin 9 head 1
1 consists of a plurality of mutually step-shaped portions of different diameters (a large diameter portion 12° located on the shaft portion 10 side, a small diameter portion 14 located on the rear end side, and a medium diameter portion 13 located between the two). There is (
Figures 5 and 6). In FIG. 5, large diameter portion 12. Medium diameter portion 13. The angle (θ1) between the straight line L+ connecting the sharp corner edges of the small diameter portion 14 and the axial center line Lo of the pin 9 is 15@~
It is preferable to set the angle to about 45°. The reason for this is that while the plug body 7 travels inside the pipe 15 in the six directions of arrows, the head 11 of the plug body 7 comes into contact with the hard scale 16 attached to the inner wall of the pipe 15, and a reaction force in the direction of arrow B is generated. Fig. 7)
This is because a part of the main body 8 is elastically deformed and the pin 9 is inclined, and the inclination angle (θ2) is considered to be about 45° at most.If a part of the small diameter part 14 wears out as shown in the figure, the next stage The corner edge of the medium diameter portion 13 contacts the scale 16 to maintain scale removal performance.

By adopting such a shape of the multistage head 11, early deterioration of the performance of the pin 9 is effectively prevented, and as a result, the durability of the plug body 7 is improved. Although the head 11 of the pin 9 has a cylindrical outer circumference, a head 11A having a rectangular outer circumference as shown in FIG. 8 may be adopted.

FIG. 9 is a sectional view showing only the main parts of the pipe cleaning plug 17. The plug body 17 is a structure formed by driving a large number of wear-resistant hard material pins 19 into a solid cylindrical main body 18 made of a hard elastic material like the plug bodies 1 and 7.

The pin 19 is an assembly in which a shaft portion 20 and a head 23 are separable, and a collar 21 that supports the head 23 at the rear end of the shaft portion 20.
and a holding protrusion 22 standing upright on the collar 21 are integrally formed, and the head 23 is coupled to the shaft portion 20 by fitting the locking hole 24 into the holding protrusion 22 (Fig. 9). or cause 12).

Therefore, the head 23 is replaceable, and if the head 23 becomes worn due to repeated use of the plug body 17, it is sufficient to replace it with a new head, and the plug body
It is economical because there is no need to dispose of it.

FIG. 13 shows a pin 19A according to a modified example as an exploded view. In the pin 19A, a locking hole 20a is formed in the shaft portion 20A, and a holding protrusion 23a is provided in a protruding manner on the head 23A.By fitting the holding projection 23a into the locking hole 20a, the head 23A is fixed to the shaft portion 20A. are combined.

Song JJL4 FIGS. 14 and 15 show a solid cylindrical body 26 made of a hard elastic material and a large number of wear-resistant hard material pins 29.
An example of a manufacturing method for obtaining a plug body 25 formed by casting is shown. The pin 29 driven into the main body 26 has its shaft portion 3
1 has a hollow portion 33 at the tip thereof, and a plurality of slits 34 along the axial direction of the shaft portion 31 on the peripheral wall of the hollow portion 33.
is formed, and a circumferential groove 32 is formed on the outer periphery of the shaft portion 31 located on the rear end side (head 30 side) of the range where the slit 34 is formed.

A cartridge 35 made of a hard material (eg, hard resin, metal) containing an instant adhesive 36 is fitted into the hollow portion 33 of the pin 29 . The cartridge 35 is destroyed by the impact force, and the instant adhesive 36 inside leaks out.

To drive the pin 29 into the main body 2B, first
A pin driving hole 21 with a depth corresponding to the length of the pin 29 is formed in the pin 2, and a cartridge 35 is attached to the tip of the pin 2.
9 into the pin driving hole 27. At this time, the tip of the cartridge 35 collides with the bottom 28 of the pin driving hole 27, and the cartridge 35 is pushed into the hollow part 33 of the pin 29 by a reaction force, and the hollow part 33 in which the slit 34 is formed opens. As shown in FIG. 15, the cartridge 35 is expanded and the instant adhesive 36 contained therein is destroyed.
leaks out and fills the gap in the pin driving hole 27. adhesive 3
6 also enters into the circumferential groove 32 of the shaft portion 31, and the hollow 33 expands to provide resistance to detachment, ensuring a large retaining force against the pin 29. Note that the inner wall of the pin driving hole 21 formed by a drill or the like is not a smooth surface but a rough surface having many irregularities, so that the adhesiveness with the adhesive 36 is good.

! FIG. 16 on IL shows a solid cylindrical plug 31 without a pin, with the main parts missing. The base of the plug body 37 is made of an elastic material, and its outer peripheral surface layer contains a large number of wear-resistant hard materials (materials harder than the scale attached to the inner wall of the pipe).
. . . metal, ceramics, glass, hard resin, etc.) A small appliance-shaped polished piece 38 is buried. Irregularly shaped polished piece 38
Unlike conventional abrasives, it has a special shape (e.g., chain-like, spectacle-like single-ring shape, spiral shape, deformed ring-shaped shell-like shape, porous shape, and octopus-like shape). Holds well to the material. Therefore, even if the outer periphery of the plug body 31 is worn out due to frictional sliding contact with the scale, the irregularly shaped abrasive pieces 38 do not fall off easily, and the base material layer in which each irregularly shaped abrasive piece 38 is buried is lost due to wear. This effectively suppresses the early deterioration of scale removal performance.

Moreover, the irregularly shaped polishing pieces 38 have good entanglement with scale due to their shape, and can improve cleaning performance. Note that if the irregularly shaped abrasive pieces 38 are formed of a porous material, the bond with the base material will be stronger. A strong bond is obtained.

Friend iJL〃 Figures 17 to 20 show the plugs 1, 7, and 17゜2.
5 shows an example of a manufacturing method for obtaining the main body (eg, high-density foamed polyurethane) of No. 5. Reference numeral 39 denotes a mold for resin foam molding, and a long solid cylindrical main body material 40 is obtained by supplying a resin liquid together with a foaming agent into the mold 39 and causing foaming. The material 40 is cut to a specified size (FIG. 19), and then rotary cutting is performed to obtain a solid cylindrical body 41 for a plug having a specified outer diameter. The advantage of this method is that solid cylindrical bodies of various shapes and two dimensions can be obtained from the raw material 40, and the number of molds can be significantly reduced compared to the conventional method.

Table 1 shows an example of the outer diameter of a long material and an example of the outer diameter of a solid cylindrical body obtained by cutting the material.

As is clear from the above description, according to the present invention, the following effects can be achieved.

According to the structure of claim (1), since the retaining protrusion is formed at the intermediate portion of the shaft portion of the pin, the retaining protrusions of adjacent pins do not interfere with each other, and the pin has a solid cylindrical shape. It is driven sufficiently deeply into the main body and is securely held so that it cannot be removed.

According to the structure of claim (2), since the head of the pin is composed of a plurality of mutually step-shaped portions with different diameters, the uppermost small diameter portion is worn out and its sharp corner edge is lost. Even if the scale is removed, the scale removal performance is maintained by the sharp corner edges of the next intermediate diameter section coming into contact with the scale, and multiple new corner edges exhibit the scale removal function depending on the number of different diameter sections. do.

Therefore, the durability of the pipe cleaning plug body is improved compared to the conventional one.

According to the configuration of claim (3), since the head of the pin is replaceably connected to the shaft, it is only necessary to replace the head when it wears out, and the solid cylindrical body can be replaced. As long as it does not wear out, the plug for cleaning inside the pipe can be used, and the durability of the plug for cleaning inside the pipe can be greatly improved.

According to the structure of claim (4), the holding force of the hard elastic material base against the irregularly shaped abrasive pieces is large, and the irregularly shaped abrasive pieces are not easily fallen off due to wear of the hard elastic material base, so that the irregularly shaped abrasive pieces can be used for cleaning inside pipes. The durability of the plug is good.

Further, because of the shape of the irregularly shaped abrasive pieces, they have good ability to entangle with scale, and together with the fact that they are less likely to fall off, the scale removal performance is improved.

According to the configuration of claim (5), since the pin is reliably held within the pin driving hole by the adhesive, detachment of the pin is effectively prevented.

According to the structure of claim (6), by obtaining the material of the solid cylindrical body as an elongated body, it is possible to save the labor required for molding, and also to reduce the number of molds and save equipment costs. By performing the subsequent cutting process, it is possible to obtain a plurality of solid cylindrical bodies with different shapes and dimensions from the same mold, which greatly contributes to improving productivity.

[Brief explanation of the drawing]

Fig. 1 is a side view of a plug for cleaning inside a pipe according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line I-II, and Fig. 3 is a
FIG. 4 is a diagram similar to FIG. 3 showing the shape of a pin according to a modified example; FIG. FIG. 6 is a view taken along the line Vl-Vl in FIG. 5, and FIG. 7 is a main part showing the state in which the inside of the pipe is cleaned with the stopper shown in FIG. 5. A cross-sectional view, FIG. 8 is a view similar to FIG. 6 showing a pin according to a modified example, and FIG. 9 is a view showing the main part of a plug for cleaning inside a pipe equipped with a pin according to another embodiment. Figure 10 is an exploded view with some of the pins shown in Figure 9 missing, Figures 11 and 12 are XI in Figure 10, respectively.
- A diagram showing the operating procedure for driving a pin into the main body, FIG. 16 is a cutaway side view of main parts showing a plug for cleaning inside a pipe according to another embodiment, and FIGS. 17 to 20 are solid diagrams. FIG. 21 is a side view showing a known plug for cleaning inside a pipe, and FIG. 22 is a sectional view thereof. 1... Plug body, 2... Main body, 3... Pin, 4...
Shaft portion, 5... Retaining protrusion, 6... Head, 7... Plug body, 8... Body, 9... Pin, 10... Shaft portion, 1
1...Head, 12...Large diameter part, 13...Medium diameter part, 1
4... Small diameter part, 15... Pipe, 16... Scale, 17... Plug body, 18... Main body, 19... Pin, 20... Shaft part, 21... Flange , 22... Holding protrusion, 23... Head, 24... Locking hole, 25... Plug body,
26... Main body, 27... Pin driving hole, 28... Hole bottom, 29... Pin, 30... Part, 31... Shaft part,
32... Circumferential groove, 33... Hollow part, 34... Slit, 35... Cartridge, 36... Adhesive, 3
7... Plug body, 38... Irregularly shaped polished piece, 39... Molding mold, 40... Material, 41... Solid cylindrical body.

Claims (6)

[Claims] (1) A plug that is inserted into a pipe and propelled through the pipe by fluid pressure, which has a solid cylindrical body made of a hard elastic material and a plug that connects from the outer periphery of the body to one another. A plug for cleaning inside a pipe, consisting of a large number of pins made of hard material that are driven in the direction of the center line of the cylinder at intervals, the heads of which are left on the outer circumferential surface of the main body, consisting of a shaft part and a head part. A plug for cleaning inside a pipe, characterized in that a protrusion for preventing the pin from coming off is provided at an intermediate portion of the shaft excluding the tip of the pin. (2) A plug that is inserted into a pipe and propelled through the pipe by fluid pressure, which has a solid cylindrical body made of a hard elastic material and a plug that connects from the outer periphery of the body to one another. A plug for cleaning inside a pipe, consisting of a large number of pins made of hard material that are driven in the direction of the cylinder centerline at intervals, the heads of which are left on the outer circumferential surface of the main body, consisting of a shaft part and a head part. A plug for cleaning inside a pipe, characterized in that the head of the pin is composed of a plurality of step-shaped portions of different diameters, and the side adjacent to the shaft portion has a large diameter and the rear end side has a small diameter. body. (3) A plug that is inserted into a pipe and propelled through the pipe by fluid pressure, which includes a solid cylindrical body made of a hard elastic material and a space spaced apart from the outer periphery of the body. In a plug body for cleaning inside a pipe, which is made of a large number of pins made of hard material and whose heads are left on the outer peripheral surface of the main body, the pins are driven in the direction of the center line of the cylinder. A plug for cleaning inside a pipe, characterized in that a head is exchangeably connected to a shaft. (4) A plug for cleaning inside a pipe, which is a solid cylindrical body made of an elastic material that is propelled through the pipe by fluid pressure while being inserted into the pipe, has a large number of wear-resistant layers in its outer peripheral surface layer. A plug for cleaning inside a pipe, characterized by having irregularly shaped abrasive pieces made of hard material embedded in a dispersed manner. (5) A plug that is inserted into a pipe and propelled through the pipe by fluid pressure, which has a solid cylindrical body made of a hard elastic material and a plug that connects the body from the outer periphery of the body to the body. A method for manufacturing a plug for cleaning inside a pipe, which comprises a large number of pins made of hard material that are driven in the direction of the center line of a cylinder at intervals, and whose heads are left on the outer peripheral surface of the main body. The shaft of the pin is hollow at least at its tip, and the base of a breakable cartridge containing an adhesive is inserted into the hollow portion of the shaft, and the base of the cartridge is inserted into the solid cylindrical body in advance. The pin is driven into the formed pin driving hole, the cartridge is destroyed by contact with the bottom of the pin driving hole, and the adhesive leaked from the cartridge is removed between the peripheral wall of the pin driving hole and the pin. A method for producing a plug for cleaning inside a pipe, characterized in that the pin is irremovably fixed by filling the plug with water. (6) A plug that is inserted into a pipe and propelled through the pipe by fluid pressure, which includes a solid cylindrical body made of a hard elastic material and a space spaced apart from the outer periphery of the body. Manufacturing the solid cylindrical body which is a structural member of a plug for cleaning inside a pipe, which is composed of a large number of pins made of hard material that are placed and driven in the direction of the center line of the cylinder, and whose heads are left on the outer peripheral surface of the body. In the method, the material of the solid cylindrical body is molded using a long mold, the obtained long material is cut into specified dimensions, and finished into the specified shape and dimensions by cutting. A method for manufacturing a plug for cleaning inside a pipe.