KR100962666B1 - Molding device of water pipe-coupling and that using molding method - Google Patents

Abstract

PURPOSE: A molding device of a water pipe coupler, and a water pipe coupler using the same are provided to accurately fix a water pipe by safely controlling the outer diameter of a second core according to the diameter of the water pipe. CONSTITUTION: A molding device of a water pipe coupler comprises a slide inner core, a first core and a second core(60). The slide inner core is connected to a cylinder shaft(24). The slide inner core has a core sliding groove and a press core(43). The core slide groove is formed in four directions. The press core is installed in the core shaft. The core moving projection of the first core is combined in the core slide groove. An inner movable core is installed in the outer end part of the first core. The second core is installed between the first cores to the outside of the slide inner core. The inner movable core is located in a core press groove of the second core.

Description

Molding device of water and sewage pipe connector and molding method of water and sewage pipe connector using the same {Molding device of water pipe-coupling and that using molding method}

The present invention relates to a molding apparatus for water and sewage pipe connector and a method for forming a water and sewage pipe connector using the same, more specifically, injection molding the connector integrally by inserting a variety of water and sewage pipe, such as water pipe, sewage pipe, double wall pipe, sewage pipe, rain pipe. In this case, the first core divided into four parts to the inner diameter of the slide is coupled and the second core is coupled between the first core in a stable and firmly fixed water and sewage pipe by the driving of the sliding and pressing core and the inner diameter moving core The present invention relates to a molding apparatus for a water and sewage pipe connector, and a method for forming a water and sewage pipe connector using the same.

Conventionally, a method and a device for forming a connector integrally by inserting a pipe are disclosed in Korean Patent Registration No. 0416408 (registered on Jan. 14, 2004). Forming a mold to reduce the diameter of the circular circle consisting of the inner mold and the center mold as the inner mold is slid by the drive of the hydraulic cylinder, and when the diameter of the inner mold and the center mold is reduced by inserting various pipes from the outside A predetermined width is inserted into the tip of the mold and the center mold, and the inner mold and the center mold are opened while the inner mold and the center mold are opened by sliding the inner mold again by the hydraulic cylinder to fix the pipe at the inner diameter.

In this way, the inner mold and the center mold fix the inner diameter of the pipe while forming a circle, but since the pipe is formed of synthetic resin, the inner diameter is not kept constant because of the characteristic that the coefficient of thermal expansion varies according to the temperature or season of the outside. The smaller one can fix the inside of the pipe as the inner mold and the center mold are opened, but when the inner diameter of the pipe is larger than the outer diameter of the inner mold and the center mold, it is impossible to fix the pipe, which makes injection difficult.

After inserting the pipe, both outer molds are coupled to each other to fix the outer diameter of the pipe, and then supply the melt of the injection raw material to the inner molding space, thereby injection molding the connector to be integrally connected to the pipe.

However, the drawback is that the internal mold and the center mold are retracted and then the pipe is inserted and reopened, which leads to time-consuming defects, and the entire surface of the inner mold and the central mold is retracted and then reopened. Since the mold is driven, the molded part of the unnecessary connector is also driven by sliding, so that the mold is damaged by sliding, thereby shortening the life of the mold.

In addition, since the inner mold and the central mold are divided into several pieces and moved by sliding, the movement is made, so it is impossible to supply the coolant or the cooling medium from the outside to the inside of the inner mold and the central mold, which consumes a lot of time for molding. It has become a defect that productivity is reduced and molding is difficult.

On the other hand, in recent years, in order to solve the drawbacks generated when molding into a mold divided as described above, the mold of the portion where the pipe is inserted and the connector is molded is molded and used as a one-piece barrel.

However, this conventional technique is that the inner diameter of the pipe is not kept constant by the coefficient of thermal expansion, so that the pipe can not be inserted, or if a large diameter is inserted, it will be crushed or impossible to form. As a result, the tube core mold has a drawback that cannot be used.

The present invention has been devised to solve such a conventional drawback, and is installed between the first core while moving the first core connected in quadrant according to the movement of the slide inner diameter core installed with the inner mold connected to the cylinder shaft. It is easy to insert the water and sewage pipe by changing the outer diameter of the second core, and the purpose of the core to accurately and securely drive the water and sewage pipe according to the inner diameter of the water and sewage pipe.

The present invention enables the injection molding of the connector integrally to the inserted water and sewage pipe, and to ensure that the drive of the mold can be made precisely and smoothly to reduce the damage caused by the operation of the mold to extend the life of the mold, and to firmly It aims to be able to form a connector without being pushed back by fixing it.

The present invention is the cylinder shaft connected to the hydraulic cylinder between the fixed side mold and the movable side of the square guide guide and the ejection plate driven by the inner mold and the core to drive the water and sewage pipe and the connector in the molding space in one piece In the molding apparatus of water and sewage pipe connector to be molded,

A slide inner diameter core connected to the cylinder shaft and forming a core slide groove in four directions and having a pressing core mounted on the fixed shaft;

A first core having a core moving protrusion coupled to the core slide groove and having an inner diameter moving core installed at an outer end thereof;

The second core is formed between the first core from the outside of the slide inner diameter core and formed a core pressing groove in which the inner diameter moving core is located.

The present invention is the cylinder shaft connected to the hydraulic cylinder between the fixed side mold and the movable side of the square guide guide and the ejection plate driven by the inner mold and the core to drive the water and sewage pipe and the connector in the molding space in one piece In the molding method of water and sewage pipe connector to be molded,

A mold separation step of separating the moving mold and the inner mold installed on the connecting shaft connecting the eject plate and the square guide from the fixed mold, and separating the moving mold from the inner mold;

An inner mold retracting step in which the inner mold and the slide inner diameter core are retracted by retracting the cylinder shaft connected to the hydraulic cylinder;

Retracting the cylinder shaft further such that the first core moves in the center direction while the slide inner diameter core is retracted together, and the pressing core presses the first core and the second core to reduce the outer diameter of the second core;

A water and sewage pipe insertion step of inserting the water and sewage pipe into the outer diameter of the second core protruding to one side of the inner mold;

A mold setting step of advancing a cylinder shaft connected to the hydraulic cylinder and setting the inner mold, the slide inner diameter core, and the first and second cores to be advanced;

The upper and lower sewer pipe fixing step of advancing the cylinder shaft further advances the slide inner diameter core and the depressed core and the first core is advanced to increase the outer diameter of the second core to fix the upper and lower sewer pipes in the inner diameter;

A mold coupling step of moving the moving mold and the inner mold in a fixed mold direction;

A connector forming step of forming a connector by fixing an outer diameter of the water and sewage pipe and injecting a synthetic resin into a molding space; And

It characterized in that it comprises a demolding step of demolding the connector formed by moving the moving side mold and the inner mold to the original position, and then performing the mold separation step, the inner mold retreat step and the core reduction step.

The present invention is to change the outer diameter of the second core installed between the first core while moving the first core connected to the quadrant in accordance with the movement of the slide inner diameter core installed with the inner mold connected to the cylinder shaft, the pressed core By providing an accurate change in the outer diameter of the second core to facilitate the insertion of the water and sewage pipe.

The present invention is to accurately and securely adjust the outer diameter of the second core in accordance with the inner diameter dimension of the water and sewage pipe to accurately fix the water and sewage pipe.

The present invention enables injection molding of the connector integrally at the tip of the inserted water and sewage pipe, and by installing a spring inside the first core and the second core to accurately and smoothly drive the mold. By reducing the damage caused by extending the life of the mold, and the external diameter of the water supply and sewage pipe is fixed and firmly fixed to the pipe so that it can be molded without being pushed back.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention molds the connector 91 integrally with the water supply and drainage pipe 90, the mold is composed of a fixed-side mold 10 and a moving-side mold 20, which is bisected at the center portion and symmetrically configured at both sides.

The stationary side mold 10 is installed on the stationary side plate 12, the movable side mold 20 installed on the opposite side is installed on the movable side plate 27, and the movable side mold 20 has a plurality of connecting shafts. The eject plate 21 which penetrates 22 is provided.

The connecting shaft 22 installed on the eject plate 21 of the moving side mold 20 is connected to the square guide guide 28 protruding in a rectangle from the connecting table 25 so that the moving side mold 20 has an internal mold ( Install so that it can be combined and separated with 30).

The moving side mold 20 is provided so that the cylinder and the cylinder shaft (not shown) is installed on one side so as to reciprocate in the drawing relative to the connecting shaft 22.

The connecting rod 25 is maintained in a fixed state, and the inner mold 30 for forming the connector 91 is penetrated through the connecting rod 25.

The inner mold 30 has an inner mold locking jaw 33 is formed, so that the inner mold mounting table 31 is connected to one side.

The inner mold 30 is formed with side wall latching jaw 32 for controlling the outer diameter of the first and second cores 50 and 60, and the springs 53 and 62 are installed therein.

The inner mold 30 is reciprocated because the cylinder shaft 24 is connected, the cylinder shaft 24 is installed in the hydraulic cylinder 23 through the plate 26.

The end of the cylinder shaft 24 is connected to the slide inner diameter core 40 is installed to reciprocate like the inner mold 30, the slide inner diameter core 40 is formed to be inclined toward the inner side from the end, In the four directions, the core slide groove 41 is coupled to the core moving protrusion 51.

A core shaft 42 is protruded at the end of the slide inner diameter core 40, and a circular pressing core 43 is installed at the end to press the sides of the first core 50 and the second core 60 to press the second side. The outer diameter of the core 60 is to be reduced.

The first core 50, which forms the core moving protrusion 51 that is coupled to the core slide groove 41 of the slide inner diameter core 40, is divided into four parts, and is supported by a spring 53 on the inside and the outside. The end portion of the side forms a movable core installation groove (52).

The moving core installation groove 52 is installed with a square inner diameter moving core 70 by a fixing bolt 71.

The first core 50 forms a wide width in the inner diameter direction and a narrow width in the outer diameter direction, and is installed to have the same diameter when combined with the slide inner diameter core 40 at the same width.

The second core 60 installed between the first cores 50 is connected to be in contact with the inclined portion in the four directions of the slide inner diameter core 40, the outer side is formed in an arc, the spring inside the While being supported by 62, the side surfaces are installed to coincide with each other between the first cores 50.

The inner end of the second core 60 is formed with a core pressing groove 61 on both sides so that the inner diameter moving core 70 is positioned and the position of the inner diameter moving core 70 is changed so that the outer diameter can be controlled. will be.

The fixed side mold 10 and the moving side mold 20 are supported by a spring 81 from the inside with an outer diameter into which the water and sewage pipe 90 is inserted, and the inside is narrow and widens toward the outside, and at the same time, protrudes outward. Install the pipe holder 80 is formed in the concave-convex type or knurling.

In the molding method of the present invention having such a configuration, the movable mold 20 and the inner mold 30 installed on the connecting shaft 22 connecting the eject plate 21 and the square guide guide 28 are fixed to the mold ( A mold separation step of separating from the mold 10 and separating the moving mold 20 from the internal mold 30;

An inner mold retraction step of retracting the cylinder shaft 24 connected to the hydraulic cylinder 23 so that the inner mold 30 and the slide inner diameter core 40 retreat;

As the cylinder shaft 24 is further retracted so that the slide inner diameter core 40 retracts together, the first core 50 moves in the center direction, and the pressing core 43 moves to the first core 50 and the second core 60. A core reduction step of pressing to reduce the outer diameter of the second core 60;

A water and sewage pipe insertion step of inserting the water and sewage pipe 90 into the outer diameter of the second core 60 protruding to one side of the inner mold 30;

A mold setting step of advancing the cylinder shaft 24 connected to the hydraulic cylinder 23 so that the inner mold 30, the slide inner diameter core 40, and the first and second cores 50 and 60 are advanced and set;

The inner diameter of the water and sewage pipe 90 is increased by further advancing the cylinder shaft 23 to increase the outer diameter of the second core 60 while the slide inner diameter core 40 and the pressing core 43 move forward and the first core 50 moves forward. Water and sewage pipe fixing step of fixing in;

A mold coupling step of moving the moving mold 20 and the inner mold 30 in a fixed mold 10 direction;

A connector forming step of forming a connector 91 by fixing an outer diameter of the water and sewage pipe 90 to inject a synthetic resin into the molding space 15; And

After the moving side mold 20 and the inner mold 30 is moved to its original position, the mold separating step, the inner mold retreat step, and the core reduction step are performed. .

In more detail below, as shown in Figure 1a and 1b, as shown in Figure 2, the mold is set (assembled) to enable injection molding of the connector 91, not shown In a state where the cylinder is connected to the moving side mold 20, the moving side mold 20 is moved to the right side in the drawing to be separated from the fixed side mold 10.

As the movable mold 20 is separated from the fixed mold 10, the inner mold 30, the slide inner diameter core 40, and the first and second cores 50 and 60 are all separated and moved to the right.

As shown in FIG. 3, the moving side mold 20 moves to the right with respect to the connecting shaft 22 connecting the rectangular guide guide 28 and the eject plate 21, and from the inner mold 30. The moving side mold 20 is removed.

As shown in FIGS. 4A and 4B, when the cylinder shaft 24 installed in the hydraulic cylinder 23 is retracted, the slide inner diameter core 40 connected with the cylinder shaft 24 moves backward together, thereby In the combined state in the entire width of the core moving protrusion 51 coupled to the core slide groove 41 is moved backward in a half (part) only coupled state.

As the slide inner diameter core 40 is retracted, the pressing core 43 connected to the core shaft 42 presses the core moving protrusion 51 of the first core 50 to move backward, so that the first core 50 is in the four directions. It will retract in the inner diameter direction.

As shown in FIGS. 5A and 5B, the cylinder shaft 24 provided in the hydraulic cylinder 23 retreats a little further, and the pressing core 43 is retracted to remove the core moving protrusion 51 of the first core 50. When pressed, the inner diameter moving core 70 fixed to the moving core installation groove 52 of the first core 50 by the fixing bolt 71 is shown in FIG. 1A in the core pressing groove 61 of the second core 60. As described above, since the first core 50 is retracted toward the center in the inner diameter direction, the inner diameter moving core 70 also moves in the center direction of the core pressing groove 61.

As the inner diameter moving core 70 moves in the center direction of the core pressing groove 61, the second core 60 moves in the center (inner diameter) direction, thereby reducing the outer diameter.

The first core 50 is supported by the springs 53 in the inner four directions, respectively, and the second core 60 is also supported by the springs 62 in the center of the inner four directions to push outwards. The elastic force is provided so that the driving is smooth and natural when the outer diameter is reduced or increased.

As shown in FIG. 6, when the cylinder shaft 24 installed in the hydraulic cylinder 23 is continuously retracted, the inner diameter of the slide inner diameter core 40 is caught by a jaw formed in the inner mold 30, and the inner diameter core 40 is provided. Retreats the inner mold 30 through the cylinder shaft 24.

As shown in FIG. 7, after the internal mold 30 is retracted, the water and sewage pipe 90 formed in advance from the outside is started to be inserted. As shown in FIGS. 8A and 8B, the water and sewage pipe 90 is opened. Inserted into the outer diameter of the second core 60 is stopped by the inner mold 30 from the outside of the side wall engaging jaw 32 can no longer enter.

The sidewall locking jaw 32 of the inner mold 30 has a larger outer diameter of the first core 50 and the second core 60 to provide a fixed state in which the outer diameter of the second core 60 can no longer be increased. will be.

9A and 9B, when the cylinder shaft 24 installed in the hydraulic cylinder 23 is advanced, the inner mold 30 moves forward while the inner mold mounting table 31 of the inner mold 30 is connected to the connecting rod 25. ) And move forward to a position where you can no longer move forward.

10A and 10B, when the cylinder shaft 24 installed in the hydraulic cylinder 23 is further advanced, the core moving protrusion 51 connected to the core slide groove 41 while the slide inner diameter core 40 is further advanced. The inner diameter of the first core 50 is pushed outward and the second core 60 is pushed outward so as to increase the outer diameter and the inner diameter of the first core 50 is installed in the movable core installation groove 52 of the first core 50. The core 70 moves the core pressing groove 61 in the outer diameter direction while moving outward from the inside of the core pressing groove 61 to increase the outer diameter of the second core 60.

When the inner diameter moving core 70 moves in the core pressing groove 61, the second core 60 is in contact with the side surface of the second core 60 on both sides of the first core 50, and when the first core 50 opens outward, As the second core 60 is opened to the outer diameter and the pressed core 43 is already protruded away from the first core 50 will not be restrained during the opening action.

The second core 60 is opened by the operation of the first core 50 in four directions and the outer diameter is increased to provide a stable and firm fixation in the circumferential direction at the inner diameter of the water supply and drainage pipe 90.

As shown in FIG. 11, the moving side mold 20 and the inner mold 30 are moved in the direction of the fixed side mold 10 to couple the moving side mold 20 and the fixed side mold 10.

Combining the moving side mold 20 and the fixed side mold 10 provides a state in which the tube holder 80 is coupled so as not to be separated to the outside under the elastic force of the spring 81, so that the moving side mold 20 and the fixed side The outer diameter of the water and sewage pipe 90 is fixed by holding the inner diameter of the mold 10 so as not to be pushed or moved at the time of forming the connector 91.

As shown in FIG. 12, since a molding space 15 is formed between the moving side mold 20 and the fixed side mold 10 by the outer diameter of the end portion of the water and sewage pipe 90, injection holes not shown from the outside are formed. The molten synthetic resin is supplied to form a connector 91 as shown in FIG. 14 so as to be integral with the water supply and drainage pipe 90.

After a predetermined cooling time has elapsed since the connector 91 is integrally formed on the water and sewage pipe 90, the moving side mold 20 and the inner mold 30 are moved to the right to demold. As shown in FIG. 3, demolding is performed to separate the moving side mold 20 from the internal mold 30. As shown in FIG. 4, the cylinder shaft 24 is reversed to reverse the slide inner diameter core 40. The inner core 30 and the pressing core 43 reduce the outer diameter of the second core 60 while the inner core 30 is retracted by clamping the first core 50 so that the connector 91 is integrally formed. It is to separate the water and sewage pipe 90 formed.

According to the present invention, the outer diameters of the first core in the four directions and the second core in the four directions coupled to the slide inner diameter cores by inserting water and sewage pipes of various types and specifications are changed smoothly and stably without being damaged when moving to the outer diameter of the mold. It can be used for a long time, and the internal and external diameter of the pipe is fixed so that the injection molding can be integrally molded in a stable state.

1A is a plan view of the main part of FIG. 1B of the present invention.

Figure 1b is a cross-sectional view of the bonding state of the mold showing a preferred embodiment of the present invention

Figure 2 is a cross-sectional view of the moving mold and the inner mold separated from the present invention

3 is a cross-sectional view of a state in which a moving side mold is separated from an internal mold of the present invention;

4A is a plan view of the main part of FIG. 4B of the present invention.

4B is a cross-sectional view of the slide inner diameter core of the present invention in a retracted state;

5A is a plan view of the main part of FIG. 5B of the present invention;

5B is a cross-sectional view of the inner diameter moving core of the present invention moved;

Figure 6 is a cross-sectional view of the inner mold and the slide inner diameter core retracted state of the present invention

7 is a cross-sectional view showing a state in which the inner mold and the slide inner diameter core of the present invention are further retracted;

8A is a plan view of the main part of FIG. 8B of the present invention.

Figure 8b is a cross-sectional view of the water and sewage pipe combined state of the present invention

Figure 9a is a plan view of the main part of Figure 9b of the present invention;

9B is a cross-sectional view of the internal mold of the present invention in an advanced state;

10A is a plan view of the main part of FIG. 10B of the present invention.

10B is a sectional view of the slide inner diameter core of the present invention further advanced.

11 is a cross-sectional view of a state in which the moving side mold and the inner mold of the present invention is coupled to the fixed side mold;

12 is a cross-sectional view of a state forming a connector in the water and sewage pipe of the present invention

Figure 13 is an exploded perspective view of the main part of the present invention.

14 is a cross-sectional view of the molded state of the connector in the water and sewage pipe of the present invention

[Description of Symbols for Main Parts of Drawing]

10: fixed side mold 11: fixed insertion groove

12: fixed side plate 15: molding space

20: moving side mold 21: ejector plate

22: connecting shaft 23: hydraulic cylinder

24: cylinder shaft 25: connecting rod

26: plate 28: square guide

30: internal mold 31: internal mold mounting table

32: side wall locking step 33: internal mold locking step

40: inner diameter of the slide 41: core slide groove

42: core axis 43: pressed core

50: first core 51: core moving projection

52: mobile core installation groove 53, 62, 81: spring

60: second core 61: core depression groove

70: inner diameter moving core 71: fixing bolt

80: pipe holder 90: water and sewage pipe

91: connector

Claims (7)

Cylinder shaft 24 connected to the hydraulic cylinder 23 between the movable mold 20 installed on the connecting shaft 22 between the stationary side mold 10, the square guide guide 28 and the eject plate 21 In the molding apparatus of the water and sewage pipe connector to drive the internal mold 30 and the core to form the water and sewage pipe 90 and the connector 91 in the molding space 15 in one piece, A slide inner diameter core 40 connected to the cylinder shaft 24 to form a core slide groove 41 in four directions and a pressing core 43 installed on the core shaft 42; A first core 50 forming a core moving protrusion 51 coupled to the core slide groove 41 and having an inner diameter moving core 70 disposed at an outer end thereof; The second core 60 is formed between the first core 50 from the outside of the slide inner diameter core 40 and formed a core pressing groove 61 in which the inner diameter moving core 70 is located. Molding apparatus for water and sewage pipe connector. The method of claim 1, The slide inner diameter core 40 installs the slide inner diameter core 40 in which the core slide groove 41 and the second core 60 are installed in an inclined direction at an inclined direction, and protrudes the core shaft 42 from the end to push down the core. Molding apparatus for water and sewage pipe connector, characterized in that 43 is installed so as to interrupt the first core (50). The method of claim 1, The first core 50 forms a moving core installation groove 52 at the outer end to install the inner diameter moving core 70 as the fixing bolt 71, and the inner diameter direction is wider and the outer diameter direction is narrower. Molding apparatus for water and sewage pipe connector. The method of claim 1, The second core 60 has an inner diameter moving core 70 coupled to an outer end thereof so that core pressing grooves 61 for expanding and reducing the outer diameter are formed on both sides thereof, and are installed to be in contact with the first core 50 from the side. Molding apparatus for water and sewage pipe connector, characterized in that. The method of claim 1, The first core 50 and the second core (60) is formed in the inner mold 30 so as to be supported by a spring (53, 62), characterized in that the installation apparatus for water and sewage pipe connector. The method of claim 1, The second core (60) is formed inside the side wall locking jaw (32) of the inner diameter mold 30 is installed so that the apparatus for water and sewage pipe connector. Cylinder shaft 24 connected to the hydraulic cylinder 23 between the movable mold 20 installed on the connecting shaft 22 between the stationary side mold 10, the square guide guide 28 and the eject plate 21 In the molding method of the water and sewage pipe connector to drive the inner mold 30 and the core to form the water and sewage pipe 90 and the connector 91 integrally in the molding space 15, Using the forming apparatus of the pipe insertion-integrated connector according to any one of claims 1 to 6, The movable mold 20 and the inner mold 30 installed on the connecting shaft 22 connecting the eject plate 21 and the square guide guide 28 are separated from the fixed mold 10, and the movable mold 20 ) Separating the mold from the internal mold 30; An inner mold retraction step of retracting the cylinder shaft 24 connected to the hydraulic cylinder 23 so that the inner mold 30 and the slide inner diameter core 40 retreat; As the cylinder shaft 24 is further retracted so that the slide inner diameter core 40 retracts together, the first core 50 moves in the center direction, and the pressing core 43 moves to the first core 50 and the second core 60. A core reduction step of pressing to reduce the outer diameter of the second core 60; A water and sewage pipe insertion step of inserting the water and sewage pipe 90 into the outer diameter of the second core 60 protruding to one side of the inner mold 30; A mold setting step of advancing the cylinder shaft 24 connected to the hydraulic cylinder 23 so that the inner mold 30, the slide inner diameter core 40, and the first and second cores 50 and 60 are advanced and set; The cylinder shaft 24 is further advanced so that the slide inner diameter core 40 and the pressing core 43 move forward, and the first core 50 moves forward to increase the outer diameter of the second core 60 so that the upper and lower sewer pipes 90 Water and sewage pipe fixing step of fixing in; A mold coupling step of moving the moving mold 20 and the inner mold 30 in a fixed mold 10 direction; A connector forming step of forming a connector 91 by fixing an outer diameter of the water and sewage pipe 90 to inject a synthetic resin into the molding space 15; And And a demolding step of demolding the connector 91 formed by moving the moving side mold 20 and the inner mold 30 to their original positions, and then performing a mold separation step, an inner mold retraction step, and a core reduction step. Forming method of water and sewage pipe connector characterized in that.

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