JP7260625B1 - PIPE, PIPE MANUFACTURING METHOD AND PIPE MANAGEMENT NUMBER ACQUISITION DEVICE - Google Patents

Abstract

Kind Code: A1 A structure of a tube capable of efficiently forming a tube having a control number, a manufacturing method, and an apparatus for forming a control number on the tube are realized. A pipe (1) is a pipe having a straight pipe portion (10) and a socket (20) positioned at one end side of the straight pipe portion (10) in an axial direction. A management number display portion 50 containing the management number of the pipe 1 is formed on a portion of the inner peripheral surface of the socket 20 that is located on the straight pipe portion 10 side. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a pipe having a straight pipe portion and a socket positioned at one axial end of the straight pipe portion, a pipe manufacturing method, and a pipe control number acquisition device.

A cast iron pipe (an example of a water pipe) that has a socket and an insertion port and is used for water pipes, for example, has a predetermined type of pipe, nominal diameter, manufacturing plant, year of manufacture, lot number, and manufacturer. A character, figure, or the like indicating a mark or the like is formed on the end face or the flange face of the socket.

As a management method for managing the production history and the like of cast iron pipes as described above, for example, in Patent Document 1, in addition to predetermined casting letters, a management number that differs for each cast pipe is assigned to the end surface or flange surface of the socket. A method for managing the production history and shipping destination of cast tubes formed in The sand mold of the core for socket casting used when casting the socket of the above-mentioned casting pipe has a surface corresponding to the end face or the flange surface of the socket, which has a predetermined character etc. and a different character for each pipe. The control number is engraved in mirror letters. The predetermined characters and the control number are formed on the end surface or flange surface of the socket of the casting pipe by stamping the socket casting core when the socket is formed. .

The cast-iron pipe production history data having the management number and the shipping destination data are associated with each management number in the management system. As a result, the production history data and the shipping destination data can be traced using the control number of the cast iron pipe as a clue.

In the operation of imprinting the mirror characters for casting on the socket casting core, the predetermined characters and the like are stamped on the socket casting core by a core mold for forming the socket casting core. Simultaneously with the formation of the core, it is stamped in place on the socket casting core. On the other hand, the mirror character of the control number is stamped on the socket casting core by a stamping device after the socket casting core is formed. That is, the mirrored characters of the management number are stamped between the characters that have already been stamped on the socket casting core.

Japanese Patent No. 5583571

As disclosed in Patent Document 1, in the operation of imprinting the control number mirror characters on the socket casting core, while checking the positions of the characters already formed on the socket casting core, , it is necessary to engrave the mirrored characters of the management number at a position that is identifiable without overlapping with the already formed characters. The mirrored characters of the control number must be stamped on an annular surface corresponding to the end face of the socket or the flange surface so that the characters are aligned in the circumferential direction while adjusting the angle of the characters.

In this way, when a mirror character such as a control number is stamped between characters etc. stamped on the annular surface of the core for socket casting, the space for stamping the mirror character such as the control number is The smaller the diameter of the cast pipe, the narrower it becomes. In addition, it is necessary to narrow the space between the mirrored letters of the control number according to the space for engraving the control number and the like. Therefore, the casting pipe having the control number on the end face or flange surface of the socket must be positioned with high accuracy between the already engraved characters, etc., and the mirror characters of the control number can be engraved. It takes time to position the imprint with respect to the core for mouth casting. Therefore, it was not possible to efficiently manufacture a tube having the control number.

SUMMARY OF THE INVENTION It is an object of the present invention to realize a structure of a pipe having a management number and capable of being efficiently manufactured, a method for manufacturing the pipe, and an apparatus for forming the management number on the pipe.

A pipe according to an embodiment of the present invention is a pipe having a straight pipe portion and a socket positioned at one end side of the straight pipe portion in the axial direction. A management number display section containing the management number of the pipe is formed on a portion of the inner peripheral surface of the socket located on the straight pipe portion side (first configuration).

As disclosed in Patent Document 1, when a control number or the like is formed on the end face or flange face of the socket of a cast iron pipe, the control number or the like is placed in a narrow space with respect to the core for socket casting. It is necessary to engrave mirror letters.

On the other hand, in the above-described configuration, the control number is formed on the portion of the inner peripheral surface of the socket of the pipe that is located on the straight pipe portion side. No need to stamp. Therefore, the control number can be easily formed on the pipe, and the pipe can be manufactured efficiently.

Moreover, in the above configuration, the control number display section including the control number can be provided on the inner peripheral surface of the socket of the tube that is resistant to dirt and damage. Therefore, the management number can be recognized with high accuracy.

Further, in the above configuration, the control number display portion is formed on the inner peripheral surface of the pipe, thereby preventing the control number display portion from affecting the appearance of the pipe.

In the first configuration, the control number display portion is formed by casting so as to protrude radially inward from the inner peripheral surface of the socket (second configuration).

Thereby, when the socket is formed by the casting mold, the control number display portion can be formed on the inner peripheral surface of the socket at the same time. Moreover, by forming the control number display portion using a mold as described above, the control number display portion can be formed on the pipe without adjusting the position of the pipe in the circumferential direction. Therefore, the management number display portion can be easily formed.

In addition, since the control number display portion protrudes radially inward from the inner peripheral surface of the receptacle, the provision of the control number display portion does not reduce the thickness of the receptacle. Therefore, there is no concern that the strength of the socket will be lowered. Therefore, it is possible to prevent a decrease in the strength of the tube.

In the first or second configuration, the control number display portion is formed on the inner peripheral surface of the socket so that the control numbers are aligned in the axial direction of the pipe (third configuration).

Accordingly, when the management number on the management number display portion is read by the imaging device, the distance between the imaging device and the management number is less likely to change than when the management numbers are arranged in the circumferential direction. Therefore, the imaging device can easily focus on the management number. Therefore, the management number can be recognized with high accuracy.

Moreover, when the management numbers are arranged in the axial direction, the radial dimensions of the unevenness forming the management numbers are substantially constant. Therefore, the control number can be easily formed on the inner peripheral surface of the socket.

A method of manufacturing a pipe according to an embodiment of the present invention is a method of manufacturing a pipe having a straight pipe portion and a socket positioned at one end side of the straight pipe portion in the axial direction. This manufacturing method comprises: a socket core forming step for forming a socket core for casting the socket; A management number recess forming step for forming a management number recess for casting the management number of the pipe on the inner peripheral surface of the socket, and using the socket core in which the management number recess is formed. and a casting step of casting a pipe in which a management number display portion including a management number of the pipe is formed in a portion of the inner peripheral surface of the socket located on the straight pipe portion side (first the method of).

As a result, it is possible to easily manufacture a pipe by casting, in which the control number display part including the control number of the pipe is formed in the portion of the inner peripheral surface of the socket that is located on the straight pipe part side. Therefore, the control number is located on the inner peripheral surface of the socket of the tube that is resistant to dirt and damage, and a tube whose control number can be accurately recognized can be easily manufactured.

In the first method, the manufacturing method comprises: an imaging step of imaging the control number formed on the inner peripheral surface of the socket with an imaging device; and a storing step of combining the management number identified by the identifying step and the pipe manufacturing information and storing them in a storage device (second method).

Thereby, the management number formed on the inner peripheral surface of the socket of the pipe can be imaged by the imaging device, and the management number can be identified from the imaged image. By combining the management number and the manufacturing conditions of the pipe and storing them in a storage device, it is possible to easily obtain the manufacturing conditions of the pipe from the management number.

Therefore, management of manufacturing information of the pipe is facilitated, and traceability of the pipe can be improved.

In the second method, the manufacturing method further includes an annealing step of annealing the pipe cast in the casting step. The imaging step is performed between the casting step and the annealing step (third method).

In the post-casting annealing process, the order in which the cast tubes are annealed may change. Therefore, by imaging the control number formed on the inner peripheral surface of the socket of the pipe between the casting process and the annealing process, the casting conditions of the pipe and the control number can be more reliably associated. can.

Therefore, it is possible to more reliably manage the manufacturing information of the pipe, and further improve the traceability of the pipe.

In the second or third method, after the casting step and before the imaging step, a removing step of removing dust from a portion of the inner peripheral surface of the socket located on the straight pipe portion side. Further have (fourth method).

As a result, after the dust adhering to the inner peripheral surface of the socket of the pipe is removed in the casting process, the control number formed on the inner peripheral surface of the socket of the pipe can be imaged by the imaging device in the imaging process. can. Therefore, the management number can be imaged more accurately and reliably by the imaging device. Therefore, the identifiability of the control number can be improved, and the traceability of the pipe can be further improved.

A pipe management number acquisition device according to an embodiment of the present invention is a device for acquiring a management number of a pipe having a straight pipe portion and a socket positioned on one end side of the straight pipe portion. This device has a rod-like shape extending in the axial direction of the tube, and is fixed to an arm portion that is rotatable about the axis of the tube, and is fixed to the tip portion of the arm portion in the axial direction, and includes a management number of the tube; an image capturing device capable of capturing an image of a control number display portion formed in a portion of the inner peripheral surface of the receptacle located on the side of the straight pipe portion; , and is rotated around the axis of the pipe by the rotation of the arm, thereby positioning the pipe on the straight pipe portion side of the inner peripheral surface of the socket. and a removal device capable of removing dust from the part.

As a result, the control number of the pipe can be imaged by the imaging device after the sand dust adhering to the portion of the inner peripheral surface of the socket of the pipe that is located on the straight pipe portion side is removed by the removing device due to casting or the like. . Therefore, the management number can be obtained and identified more reliably.

A pipe according to an embodiment of the present invention is a pipe having a straight pipe portion and a socket positioned at one end side of the straight pipe portion in the axial direction. A management number display section containing the management number of the pipe is formed on a portion of the inner peripheral surface of the socket located on the straight pipe portion side.

As a result, compared with the conventional structure in which the control number is formed on the end surface or flange surface of the socket, the control number can be easily formed on the pipe, and the pipe can be manufactured efficiently. Moreover, by forming the control number on the inner peripheral surface of the socket of the pipe, the control number can be accurately recognized and the control number can be prevented from affecting the appearance of the pipe.

FIG. 1 is a diagram showing a schematic configuration of a tube. FIG. 2 is a diagram schematically showing a case where the insertion port of another tube is positioned at the retracted position with respect to the socket of the tube. FIG. 3 is a diagram schematically showing a case where the insertion port of another tube is positioned at the extended position with respect to the socket of the tube. FIG. 4 is a view of the socket of the pipe and the control number acquisition device viewed in the radial direction. FIG. 5 is a view of the pipe socket and the control number acquiring device when viewed in the axial direction. FIG. 6 is a diagram schematically showing the tube manufacturing process. FIG. 7 is a diagram showing a schematic configuration of a casting mold and a socket core used for casting a pipe.

Each embodiment will be described below with reference to the drawings. In each figure, the same parts are denoted by the same reference numerals, and the description of the same parts will not be repeated. Note that the dimensions of the constituent members in each drawing do not faithfully represent the actual dimensions of the constituent members, the dimensional ratios of the respective constituent members, and the like.

In the following description, the axial direction means the direction in which the axis P of the tube 1 extends. Radial direction means the direction perpendicular to the axis P of the tube 1 . The circumferential direction means the direction in which the inner peripheral surface of the pipe 1 extends when the pipe 1 is viewed in the axial direction.

In addition, in the following description, expressions such as “fixed”, “connected” and “attached” (hereinafter referred to as “fixed”) are used not only when members are directly fixed to each other, but also when they are fixed via other members. It also includes cases where it is fixed. That is, in the following description, expressions such as fixing include meanings such as direct and indirect fixing between members.

(tube)
A pipe 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of a tube 1. FIG. The pipe 1 is, for example, a cast iron pipe made of ductile cast iron. The pipe 1 has a straight pipe portion 10 , a socket 20 and a spigot 30 .

The straight pipe portion 10 has a cylindrical shape extending linearly along the axis P. As shown in FIG. A socket 20 is positioned on one end side of the straight tube portion 10 . The outer peripheral surface of the straight pipe portion 10 has, at one end in the axial direction, a straight pipe portion inclined surface 11 that is a tapered surface whose outer diameter increases toward the socket 20 . An insertion port 30 is positioned on the other end side of the straight tube portion 10 .

The socket 20 is the part into which the spigot 30 of another tube is inserted. The socket 20 has a cylindrical shape extending in the axial direction of the straight pipe portion 10 from one end side of the straight pipe portion 10 . That is, the base end portion 21 of the socket 20 is connected to the straight pipe portion 10 . The outer peripheral surface of the base end portion 21 of the socket 20 is connected to the straight pipe portion inclined surface 11 of the straight pipe portion 10 . The outer peripheral surface of socket 20 is a tapered surface whose outer diameter increases from base end portion 21 to tip end portion 22 . That is, the minimum outer diameter of the socket 20 is substantially the same as the maximum outer diameter of the straight pipe portion inclined surface 11 of the straight pipe portion 10 .

Moreover, the inner diameter of the socket 20 is larger than the inner diameter of the straight pipe portion 10 . Therefore, the inner peripheral surface of the base end portion 21 of the socket 20 and the inner peripheral surface of the straight pipe portion 10 on the one end side are connected via an annular stepped surface.

The socket 20 has a plurality of projections 23 on its end face, which constitute letters, figures, etc. such as the nominal diameter of the pipe, the factory, the year of manufacture, the lot number, and the mark of the manufacturer. The plurality of protrusions 23 are cast characters formed in the casting process of the manufacturing process of the tube 1 . The plurality of protrusions 23 are arranged side by side in the circumferential direction on the end face of the distal end portion 22 of the receptacle 20 .

The socket 20 has a rubber ring retaining groove 25, a lock ring housing groove 26, and a guide portion 27 on its inner peripheral surface. The rubber ring retaining groove 25, the lock ring accommodating groove 26, and the guide portion 27 are formed with a predetermined machining accuracy by machining after the pipe 1 is cast. The rubber ring locking groove 25, the lock ring housing groove 26, and the guide portion 27 are formed on the inner peripheral surface of the socket 20 from the tip end portion 22 side of the socket 20. , the guide portion 27 .

The rubber ring locking groove 25 is an annular recess that is recessed radially outward along the circumferential direction of the inner peripheral surface of the socket 20 . The rubber ring locking groove 25 is positioned closest to the distal end portion 22 of the socket 20 among the rubber ring locking groove 25 , the lock ring accommodating groove 26 and the guide portion 27 . A rubber ring 41 (see FIGS. 2 and 3) is inserted into the rubber ring locking groove 25 to fill the gap between the inner peripheral surface of the socket 20 and the outer peripheral surface of another pipe inserted into the socket 20. be done. The rubber ring locking groove 25 holds the rubber ring 41 located in the rubber ring locking groove 25 at a predetermined position in the socket 20 when another tube is inserted into the socket 20 .

As shown in FIG. 1 , the lock ring accommodating groove 26 is an annular recess that is recessed radially outward along the circumferential direction of the inner peripheral surface of the socket 20 . The lock ring receiving groove 26 is located closer to the straight tube portion 10 than the rubber ring retaining groove 25 is. A lock ring 42 and a lock ring holder 43 (see FIGS. 2 and 3) are inserted into the lock ring accommodating groove 26 . The lock ring 42 is a member that contacts the insertion opening protrusion 31 of another tube inserted into the socket 20 . The lock ring holder 43 is an annular member that holds the lock ring 42 .

As shown in FIGS. 2 and 3, the inner diameter of the lock ring 42 held by the lock ring holder 43 positioned within the lock ring accommodation groove 26 is equal to the insertion opening protrusion 31 of another tube inserted into the socket 20. As shown in FIGS. smaller than the outer diameter of Therefore, the lock ring 42 comes into contact with the insertion opening protrusion 31 of another tube inserted into the socket 20 . The lock ring receiving groove 26 holds the lock ring holder 43 positioned inside the lock ring receiving groove 26 . That is, the lock ring accommodating groove 26 prevents the other tube from moving in the axial direction when the insertion opening protrusion 31 of another tube located closer to the straight tube portion 10 than the lock ring accommodating groove 26 contacts the lock ring 42 . to regulate.

As shown in FIG. 1 , the guide portion 27 is located on the straight pipe portion 10 side with respect to the lock ring accommodating groove 26 . The guide portion 27 is an inclined surface whose inner diameter increases toward the straight pipe portion 10 side. As shown in FIG. 3, when the insertion opening projection 31 of another tube positioned closer to the straight tube portion 10 than the lock ring accommodating groove 26 moves toward the distal end portion 22 of the socket 20, the guide portion 27 Guide the insertion opening protrusion 31 to the lock ring 42 . As a result, the insertion opening protrusion 31 of the other tube positioned closer to the straight tube portion 10 than the lock ring accommodating groove 26 can smoothly contact the lock ring 42 .

As shown in FIGS. 1-3, socket 20 has buffer space 28 between guide portion 27 and proximal end 21 . The buffer space 28 is positioned between the straight pipe portion 10 side of the guide portion 27 and the step surface 21 a of the base end portion 21 of the socket 20 . The buffer space 28 is a space in which the spigot 30 of another tube inserted into the receptacle 20 can move axially.

FIG. 2 is a diagram schematically showing a case where the insertion port 30 of another tube is positioned at the retracted position with respect to the socket 20 of the tube 1. As shown in FIG. FIG. 3 is a diagram schematically showing a case where the insertion port 30 of another tube is positioned at the extended position with respect to the socket 20 of the tube 1. As shown in FIG.

As shown in FIG. 2, when the insertion port 30 of another tube inserted into the socket 20 moves toward the straight tube portion 10, the tip of the insertion port 30 of the other tube comes into contact with the stepped surface 21a. Move to the retracted position. On the other hand, as shown in FIG. 3, when the insertion opening 30 of the other tube inserted into the socket 20 moves toward the distal end portion 22 of the socket 20, the insertion opening 30 of the other tube moves toward the insertion opening protrusion. 31 moves to the extended position where it contacts the lock ring 42 .

The receptacle 20 can hold the receptacle 30 of another tube inserted into the receptacle 20 at any position between the extended position and the contracted position. As shown in FIG. 1, the range from the distal end portion 22 of the receptacle 20 to the guide portion 27 is formed as a connecting portion 20a that is machined with a predetermined machining accuracy and has sufficient rigidity. By increasing the processing accuracy and rigidity of the connecting portion 20a, the socket 20 can hold another pipe without leaking the fluid flowing through the pipe 1. As shown in FIG.

The insertion port 30 is a cylindrical portion extending in the axial direction of the straight pipe portion 10 from the other end side of the straight pipe portion 10 . The insertion opening 30 has an insertion opening protrusion 31 that protrudes radially outward at its tip. The insertion opening protrusion 31 has an insertion opening inclined surface 31a on the distal end side of the insertion opening 30, which is a tapered surface whose outer diameter decreases toward the distal end of the insertion opening 30. As shown in FIG. The insertion opening protrusion 31 has a contact surface 31 b that contacts the lock ring 42 at the end on the straight pipe portion 10 side.

When the insertion port 30 is inserted into the socket 20 of another tube, the insertion port inclined surface 31a of the insertion port protrusion 31 is inserted into the buffer space 28 beyond the lock ring 42. As shown in FIG. Thereby, the spigot 30 of the tube 1 is connected to the socket 20 of another tube.

(Management number display part)
As shown in FIG. 1 , the pipe 1 has a control number display portion 50 on the inner peripheral surface of the socket 20 . The control number display part 50 is a part that displays a control number associated with information such as the raw material, processing, shipping, distribution, sales, construction, and disposal history of the pipe 1 . The management number display section 50 contains a management number. Note that the control number display portion 50 may include a flat portion formed on the inner peripheral surface of the socket 20 in order to display the control number.

The control number display portion 50 is formed in a portion of the inner peripheral surface of the receptacle 20 that constitutes the buffer space 28 . That is, the control number display portion 50 is formed in a portion overlapping the buffer space 28 in the socket 20 except for the connection portion 20a where machining accuracy and rigidity are required when viewing the pipe 1 in the radial direction. It is preferable that the management number display portion 50 be provided at a position close to the connecting portion 20a side of the inner peripheral surface forming the buffer space 28 of the socket 20 . Thereby, the management number contained in the management number display portion 50 can be easily confirmed from the tip portion 22 side of the receptacle 20 .

The control number display portion 50 is formed on the inner peripheral surface of the socket 20 so that the control numbers are aligned in the axial direction of the pipe 1 . When the management number display portion is formed so that the management numbers are arranged in the circumferential direction on the inner peripheral surface of the socket 20, the distance between the management number display portion and an imaging device such as a camera is large when reading the management number. Since it changes in the circumferential direction, there is a possibility that the management number cannot be accurately read by the imaging device. On the other hand, since the control numbers are arranged in the axial direction of the pipe 1 as described above, the distance between the imaging device and the inner peripheral surface of the socket 20 changes when reading the control number on the control number display section 50. can be prevented. Therefore, the management number of the management number display section 50 can be accurately read by the imaging device 110, which will be described later.

Moreover, when the control numbers of the control number display portion 50 are arranged in the axial direction on the inner peripheral surface of the socket 20, the radial dimensions of the irregularities forming the control numbers are substantially constant. Therefore, the control number can be easily formed on the inner peripheral surface of the receptacle 20 .

The management number is a character string composed of a combination of numbers, alphabets, symbols, etc., individually assigned to each pipe. That is, the management number is a number unique to the pipe 1. FIG.

In this embodiment, the control number display part 50 is integrally formed with the receptacle 20 by, for example, casting. Therefore, the control number display portion 50 protrudes radially inward from the inner peripheral surface of the socket 20 .

Thereby, when the socket 20 is formed by the mold, the control number display portion 50 can be formed on the inner peripheral surface of the socket 20 at the same time. Moreover, by forming the control number display portion 50 using a mold as described above, the control number display portion 50 can be formed on the pipe 1 without adjusting the position of the pipe 1 in the circumferential direction. Therefore, the control number display section 50 can be easily formed.

Further, since the control number display portion 50 protrudes radially inward from the inner peripheral surface of the socket 20, the provision of the control number display portion 50 does not make the socket 20 thin. Therefore, there is no concern that the strength of the socket 20 will be lowered. Therefore, a decrease in the strength of the pipe 1 can be prevented.

As described above, in the present embodiment, the pipe 1 is a pipe having the straight pipe portion 10 and the socket 20 positioned at one end side of the straight pipe portion 10 in the axial direction. A management number display portion 50 containing the management number of the pipe 1 is formed on a portion of the inner peripheral surface of the socket 20 that is located on the straight pipe portion 10 side.

As a result, since the control number is formed on the portion of the inner peripheral surface of the socket 20 of the pipe 1 that is located on the straight pipe portion 10 side, it is not necessary to engrave the mirror character of the control number in a narrow space. Therefore, the control number can be easily formed on the pipe 1, and the pipe 1 can be manufactured efficiently.

Moreover, in the above-described configuration, the control number display section 50 including the control number can be provided on the inner peripheral surface of the socket 20 of the tube 1 which is resistant to dirt and damage. Therefore, the management number can be recognized with high accuracy.

In addition, in the above-described configuration, since the control number display portion 50 is formed on the inner peripheral surface of the pipe 1 , it is possible to prevent the control number display portion 50 from affecting the appearance of the pipe 1 .

(Management number acquisition device)
Next, the management number acquiring device 100 for acquiring the management number contained in the management number display section 50 formed on the inner peripheral surface of the socket 20 of the pipe 1 will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a view of the socket 20 of the pipe 1 and the control number acquisition device 100 viewed in the radial direction. FIG. 5 is a diagram of the socket 20 of the pipe 1 and the control number acquisition device 100 viewed in the axial direction.

The management number acquisition device 100 has an imaging device 110 , a removal device 120 , a rotary drive device 130 , a control device 140 and a storage device 150 .

The imaging device 110 images the control number display portion 50 formed on the tube 1 . The imaging device 110 is, for example, a camera. The imaging device 110 is fixed to an axial end portion of an arm portion 131 of a rotation driving device 130 to be described later. The imaging device 110 rotates around the axis P together with the rotary drive device 130 to capture an image of at least a portion of the socket 20 including the control number display section 50 . The imaging device 110 transmits the captured image to the control device 140, which will be described later.

The removal device 120 is a device for removing dust covering the inner peripheral surface of the socket 20 of the pipe 1 . The removing device 120 includes, for example, a rod-shaped member having a brush at its tip. As with the imaging device 110 , the removal device 120 is fixed to the tip of the arm portion 131 of the rotary drive device 130 in the axial direction. The removal device 120 is fixed to the tip portion of the arm portion 131 in the axial direction so as to be located forward of the imaging device 110 in the rotation direction of the arm portion 131 . The removing device 120 radially extends from the arm portion 131 toward the inner peripheral surface of the socket 20 .

With such a configuration of the removing device 120 , the removing device 120 removes dust on the inner peripheral surface of the socket 20 by rotating about the axis P together with the rotation driving device 130 and the imaging device 110 .

In the present embodiment, the removing device 120 rotates about the axis P of the pipe 1 by rotating the arm portion 131, thereby removing dust from the portion of the inner peripheral surface of the socket 20 located on the straight pipe portion 10 side. It is fixed to the arm portion 131 so as to be removable. Further, the imaging device 110 rotates about the axis P of the pipe 1 by rotating the arm portion 131 so that the portion of the inner peripheral surface of the socket 20 located on the straight pipe portion 10 side can be imaged. , is fixed to the arm portion 131 . The straight pipe portion 10 side of the inner peripheral surface of the socket 20 means a portion of the inner peripheral surface of the socket 20 that forms the buffer space 28 excluding the connecting portion 20a.

The rotary drive device 130 is a device that rotates the arm portion 131 around the axis P. As shown in FIG. The rotation driving device 130 has an arm portion 131 and a driving portion 132 . The arm portion 131 is rod-shaped and extends axially along the axis P, and is arranged in the socket 20 of the pipe 1 . The driving portion 132 gives a rotational driving force for rotating the arm portion 131 around the axis P. As shown in FIG. The drive unit 132 is, for example, a motor. In addition, the driving section 132 may apply a driving force to the arm section 131 to move the arm section 131 in the axial direction.

The control device 140 controls driving of the drive unit 132 of the rotary drive device 130 and also controls the imaging device 110 to obtain image data captured by the imaging device 110 . The control device 140 determines whether or not an image related to the management number is included in the captured image while acquiring data of the image captured by the image capturing device 110, and determines whether the image related to the management number is included in the captured image. The drive unit 132 of the rotary drive device 130 is driven until the arm unit 131 is rotated or moved.

The control device 140 acquires information about the control number of the pipe 1 from data of the captured image of the imaging device 110 by image processing or the like. That is, the control device 140 detects a character string forming the management number from the image captured by the imaging device 110, and identifies characters, numbers, and the like from the detected character string. The control device recognizes the specified letters, numbers, etc. as the management number of the pipe 1 . The control device 140 outputs the acquired information about the management number to the storage device 150 together with the captured image data.

The storage device 150 is a device that stores management numbers, manufacturing histories, shipping histories, and the like. The storage device 150 receives information related to the management number from the control device 140 together with the data of the captured image, and receives product information, manufacturing information, etc. (hereinafter referred to as manufacturing information, etc.) of the tube 1 from a manufacturing control device (not shown). . The product information includes information regarding the size and material of the tube 1 . The manufacturing information includes information on date and time of manufacturing, manufacturing history, shipping history, and the like. Note that the product information does not have to be stored in the storage device 150 .

The storage device 150 has a storage control device (not shown) that associates the information on the management number with the manufacturing information and the like. As a result, the storage device 150 stores traceability information in which the management number and the manufacturing information are associated with each other.

The storage device 150 may be provided on a network, or may be provided in a manufacturing system for manufacturing the pipe 1, for example. Various information stored in the storage device 150 can be retrieved by a server or a computer terminal.

The management number acquisition device 100 having the above configuration takes an image of a part of the inner peripheral surface of the socket 20 including the management number, and identifies the management number as character information. In addition, the management number acquisition device 100 stores information associating the identified management number with manufacturing information and the like as traceability information.

The management number acquisition device 100 acquires manufacturing information and the like in each manufacturing process of the pipe 1 to be described later, and obtains traceability information by associating it with the management number of the pipe 1 . In addition, since the control number display portion 50 including the control number is formed on the inner peripheral surface of the socket 20 of the pipe 1, the pipe 1 can be replaced by removing or reinserting the pipe 1 in the manufacturing process of the pipe 1. Even if the manufacturing order is changed, the management number acquisition device 100 can associate the manufacturing information of the pipe 1 with the management number.

As described above, in the present embodiment, the management number acquisition device 100 acquires the management number of the pipe 1 having the straight pipe portion 10 and the socket 20 located on one end side of the straight pipe portion 10 . The management number acquiring device 100 is a rod-shaped member extending in the axial direction of the pipe 1 , and is fixed to an arm portion 131 rotatable about the axis of the pipe 1 and to the distal end portion of the arm portion 131 in the axial direction. An image capturing device 110 capable of capturing an image of the management number display portion 50 formed on the portion of the inner peripheral surface of the receptacle 20 located on the straight pipe portion 10 side, and the rotation of the arm portion 131 rather than the image capturing device 110. It is fixed to the tip of the arm portion 131 in the axial direction so as to be located in front of the direction, and by rotating the arm portion 131 around the axis P of the tube 1, the inner peripheral surface of the socket 20 is straightened. and a removing device 120 capable of removing dust from a portion positioned on the pipe portion 10 side.

As a result, after the removal device 120 removes dust adhering to the portion of the inner peripheral surface of the socket 20 of the pipe 1 located on the straight pipe portion 10 side due to casting or the like, the control number of the pipe 1 is determined by the imaging device 110. It can be imaged. Therefore, the management number can be obtained and identified more reliably.

(Manufacturing method of tube)
Next, a method for manufacturing the tube 1 according to the present invention will be described with reference to FIGS. 6 and 7. FIG. 6A and 6B schematically show the manufacturing process of the tube 1. FIG. FIG. 7 is a diagram showing a schematic configuration of a casting mold M1 and a socket core M2 used for casting the pipe 1. As shown in FIG.

As shown in FIG. 6, the method for manufacturing the pipe 1 includes a casting step S1, an annealing step S2, a surface treatment step S3, a processing step S4, a painting step S5, and a control number acquisition step S6.

The casting step S1 is a step of forming the pipe 1 using molten metal. In the casting step S1, the straight pipe portion 10 and the spigot 30 of the pipe 1 are cast, for example, by centrifugal casting. Centrifugal force casting utilizes the centrifugal force of a rapidly rotating mold to form molten ductile iron into a hollow cylinder. The socket 20 of the tube 1 is cast using a sand mold.

Specifically, in the casting step S1, the pipe 1 is cast using a casting mold M1 and a socket core M2 shown in FIG. The casting mold M1 is a cylindrical mold. The casting mold M1 has a straight pipe forming portion M12 that forms the outer peripheral surface of the straight pipe portion 10 and a socket forming portion M11 that forms the outer peripheral surface of the socket 20 .

The socket core M2 is a sand mold. The socket core M2 has a columnar core main body M21 and a flange portion M22. The core main body M21 is arranged inside the socket forming portion M11 of the casting mold M1 and forms the inner peripheral surface of the socket 20. As shown in FIG. The flange portion M22 is positioned so as to cover the opening end portion of the cylindrical casting mold M1 and forms the end surface of the tip portion 22 of the socket 20 .

The flange portion M22 has letters, figures, etc. indicating a predetermined pipe type, nominal diameter, manufacturing plant, manufacturing year, lot number, manufacturer's mark, etc. on the surface forming the end surface of the tip portion 22 of the socket 20. is engraved with mirrored characters.

The core main body M21 has a management number concave portion M21a formed in a mirror image of the management number in a portion of the outer surface that forms the buffer space 28 of the socket 20. As shown in FIG. The management number recess M21a is formed on the outer surface of the core body M21 so that the mirrored letters of the management number are aligned in the axial direction.

As shown in FIG. 6, the method for manufacturing the tube 1 includes a step of forming the aforementioned socket core M2, which is a sand mold, before the casting step S1. Specifically, the method for manufacturing the pipe 1 includes a socket core forming step S1A and a control number concave portion forming step S1B.

In the receptacle core forming step S1A, a core body M21 for forming the inner peripheral surface of the receptacle 20 and a flange portion M22 for forming the end surface of the tip portion 22 of the receptacle 20 are formed as sand molds. . In the control number recess forming step S1B, a control number recess M21a is formed in a portion of the outer surface of the core main body M21 of the socket core M2 where the buffer space 28 is formed. In the control number recess forming step S1B, a stamping machine or the like is used to form control number recesses M21a on the outer surface of the core main body M21 so that the mirror letters of the control number are aligned in the axial direction.

In the casting step S1, the pipe 1 is cast using the casting mold M1 and the socket core M2 having the above configurations. In the casting step S1, a predetermined character or the like is formed as a cast character on the end surface of the tip portion 22 of the socket 20, and a control number is cast on the inner peripheral surface of the socket 20. formed as characters. After the casting step S1, the cast pipe 1 is removed from the casting mold M1.

The annealing step S2 is a step of removing residual stress generated during casting of the ductile cast iron forming the pipe 1 and simultaneously improving workability and ductility of the material. In the annealing step S2, the tube 1 is heated at a predetermined temperature for a predetermined time by an annealing furnace. The annealed tube 1 is cooled by a cooling device.

The surface treatment step S3 is a step of performing a shot treatment on the outer surface of the pipe 1 to remove stains, scales, and the like on the outer surface of the pipe 1 .

The machining step S4 is a step of machining the pipe 1 . In the processing step S4, the inner peripheral surface of the socket 20 of the pipe 1 is processed. A rubber ring retaining groove 25 and a lock ring accommodating groove 26 are formed on the inner peripheral surface of the socket 20 . In addition, in the processing step S<b>4 , the inserting opening protrusion 31 is formed by welding a ring member to the outer peripheral surface of the inserting opening 30 or performing build-up welding.

The painting step S5 is a step of painting the pipe 1 . In the coating step S5, all surfaces including the inner and outer peripheral surfaces of the pipe 1 machined in the processing step S4 may be coated, or only the outer peripheral surface may be coated.

The management number obtaining step S6 is a step of obtaining the management number of the pipe 1 by the management number obtaining device 100 and associating the management number with the production history of the pipe 1 and the like. The control number acquisition step S6 is performed before and after each step of the manufacturing method of the tube 1 before and after the process of changing the manufacturing process of the tube due to extraction, re-insertion, or the like. Specifically, the control number acquisition step S6 includes, for example, between the casting step S1 and the annealing step S2, between the annealing step S2 and the surface treatment step S3, between the surface treatment step S3 and the processing step S4, and between the processing step S3 and the processing step S4. It is performed at least once between the step S4 and the coating step S5, and after the coating step S5 and before shipment.

The management number acquisition step S6 includes a removal step S6A, an imaging step S6B, an identification step S6C, and a storage step S6D.

The removing step S<b>6</b>A is a step of removing dust covering the inner peripheral surface of the socket 20 using the removing device 120 . Specifically, in the removing step S6A, the arm portion 131 is rotated about the axis P by the driving portion 132, so that the dust on the inner peripheral surface of the socket 20 is removed by the removing device 120 connected to the arm portion 131. Remove.

The imaging step S6B is a step of imaging the control number of the control number display section 50 using the imaging device 110 . Specifically, in the imaging step S6B, the arm portion 131 is rotated about the axis P by the driving portion 132, and the image of the control number display portion 50 including the control number of the socket 20 is captured by the imaging device 110. FIG. The imaging device 110 transmits image data of the imaged management number display section 50 to the control device 140 .

The identification step S6C is a step of identifying the control number included in the image. Specifically, in the identification step S6C, the control device 140 identifies the management number of the pipe 1 using the image data transmitted from the imaging device 110 . Information about the management number identified by control device 140 is sent to storage device 150 .

The storage step S6D is a step of storing the management number of the pipe 1 identified in the identification step S6C and the manufacturing information of the pipe 1, etc. in combination in the storage device 150. FIG. In the storage step S6D, information related to the management number transmitted from the control device 140 is input to the storage device 150, and manufacturing information and the like are input from the manufacturing control device (not shown). In the storage device 150, the management number and the manufacturing information are associated and stored by a storage control device (not shown). That is, the traceability information of the tube 1 is stored in the storage device 150 .

As described above, the control number acquisition step S6 includes, for example, between the casting step S1 and the annealing step S2, between the annealing step S2 and the surface treatment step S3, between the surface treatment step S3 and the processing step S4, and during the processing It is performed at least once between step S4 and painting step S5, after painting step S5 and before shipment.

As a result, even if the manufacturing order of the tubes 1 is changed due to extraction, reinsertion, etc., the management number of the tubes 1 and the manufacturing information can be associated and stored in the storage device 150 . Therefore, the traceability information stored in the storage device 150 can be updated. Note that post-shipment information of the pipe 1 (stock destination, shipping destination, delivery destination, installation location of the pipe 1, etc.) may be associated with the management number of the pipe 1 and stored in the storage device 150 .

The removal step S6A in the control number acquisition step S6 is performed at least once between the casting step S1 and the annealing step S2 and between the annealing step S2 and the surface treatment step S3. Therefore, when the control number acquisition step S6 is performed between the surface treatment step S3 and the processing step S4, between the processing step S4 and the painting step S5, or after the painting step S5 and before shipping , the removal step 6A is not performed.

A management number display portion 50 including a management number is formed on the inner peripheral surface of the socket 20 of the tube 1 manufactured by the manufacturing method described above. In the tube 1 having the control number display section 50 including the control number, it is possible to easily confirm the manufacturing information of the tube 1 from the control number. Therefore, the management of the manufacturing information of the tube 1 becomes easy, and the traceability of the tube 1 can be improved.

The method for manufacturing the pipe 1 of the present embodiment is a method for manufacturing the pipe 1 having the straight pipe portion 10 and the socket 20 positioned at one end side of the straight pipe portion 10 in the axial direction. This manufacturing method includes a socket core forming step S1A for forming a socket core M2 for casting the socket 20, a control number recess forming step S1B for forming a control number recess M21a for casting the control number of the pipe 1 on the inner peripheral surface of the socket 20; A casting step S1 of casting a pipe 1 in which a control number display portion 50 containing the control number of the pipe 1 is formed on a portion of the inner peripheral surface of the socket 20 located on the side of the straight pipe portion 10 using the tool M2. and have

As a result, the pipe 1 in which the management number display portion 50 including the management number of the pipe 1 is formed on the portion of the inner peripheral surface of the socket 20 located on the side of the straight pipe portion 10 can be easily manufactured by casting. can be done. Therefore, the control number is located on the inner peripheral surface of the socket 20 of the tube 1 which is hard to get dirty and damaged, and the tube 1 whose control number can be accurately recognized can be easily manufactured.

Further, in the present embodiment, the manufacturing method includes an imaging step S6B of imaging the management number formed on the inner peripheral surface of the socket 20 with the imaging device 110, and the management number from the image captured by the imaging step S6B. and a storage step S6D of combining the management number identified by the identification step S6C and the manufacturing information of the pipe 1 and storing them in the storage device 150. FIG. The manufacturing information includes information on manufacturing conditions, manufacturing date, material components, dimensions, and the like of the tube 1 .

Thereby, the control number formed on the inner peripheral surface of the socket 20 of the pipe 1 can be imaged by the imaging device 110, and the control number can be identified from the imaged image. By combining the management number and the manufacturing conditions of the pipe 1 and storing them in the storage device 150, the manufacturing conditions of the pipe 1 and the like can be easily acquired from the management number.

Therefore, the management of the manufacturing information of the tube 1 becomes easy, and the traceability of the tube 1 can be improved.

Moreover, in this embodiment, the manufacturing method further includes an annealing step S2 of annealing the pipe 1 cast in the casting step S1. The imaging step S6B is performed between the casting step S1 and the annealing step S2.

In the annealing step S2 after casting, the order of annealing the cast pipe 1 may be changed. Therefore, by taking an image of the control number formed on the inner peripheral surface of the socket 20 of the pipe 1 between the casting process S1 and the annealing process S2, the casting conditions of the pipe 1 and the control number can be confirmed more reliably. can be associated.

Therefore, the management of the manufacturing information of the pipe 1 can be performed more reliably, and the traceability of the pipe 1 can be further improved.

Further, in the present embodiment, in the manufacturing method, after the casting step S1 and before the imaging step S6B, dust is removed from the portion of the inner peripheral surface of the socket 20 located on the straight pipe portion 10 side. It further has step S6A.

As a result, after removing dust adhering to the inner peripheral surface of the socket 20 of the pipe 1 in the casting step S1, the management number formed on the inner peripheral surface of the socket 20 of the pipe 1 is captured by the imaging device in the imaging step S6B. 110 can be imaged. Therefore, the image pickup device 110 can image the management number more accurately and reliably. Therefore, the identifiability of the control number can be improved, and the traceability of the pipe 1 can be further improved.

In addition, after the casting step S1, dust on the portion of the inner peripheral surface of the socket 20 located on the straight pipe portion 10 side is removed by the removing device 120 of the present embodiment, and the control number of the pipe 1 is determined in the imaging step S6B. can suppress the temperature drop of the pipe 1 after casting, compared to the case where shot blasting or the like is performed to remove dust. Thereby, the annealing step S2 can be shortened, and the manufacturing efficiency of the pipe 1 can be improved.

(Other embodiments)
Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, without being limited to the above-described embodiment, it is possible to modify the above-described embodiment as appropriate without departing from the spirit thereof.

In the above-described embodiment, the control number display portion 50 is formed on the portion of the inner peripheral surface of the socket 20 of the pipe 1 that is located on the straight pipe portion 10 side. However, as long as it is the inner peripheral surface of the receptacle, the control number display portion may be formed on another portion. If it is a socket, the control number display part may be formed on a part other than the inner peripheral surface.

In the above-described embodiment, the control number display portion 50 is formed on the inner peripheral surface of the socket 20 so that the control numbers are aligned in the axial direction of the pipe 1 . However, the control number display portion may be formed on the inner peripheral surface of the socket so that the control numbers are arranged in the circumferential direction of the pipe.

In the above embodiment, the tube 1 has one control number display section 50 . However, the tube may have more than one control number indicator. For example, control number display portions may be formed on the outer peripheral surface and the inner peripheral surface of the socket of the pipe.

In the above embodiment, the control number of the control number display portion 50 is formed on the inner peripheral surface of the socket 20 of the pipe 1 by casting. However, the control number may be formed on the tube by other methods such as laser machining.

In the above embodiment, the management number acquisition device 100 has the removal device 120 . However, the management number acquisition device may not have the removal device.

In the above-described embodiment, the management number acquisition device 100 has the rotation drive device 130 that rotates the imaging device 110 and the removing device 120 around the axis P. As shown in FIG. The imaging device and removal device may be configured to be rotated by separate devices. A plurality of imaging devices may be provided so that the entire inner peripheral surface of the socket of the pipe can be imaged without rotating about the axis P. Further, the configuration of the rotation drive device is not limited to the configuration of the present embodiment, as long as at least one of the imaging device and the removing device can be rotated around the axis P, and any configuration may be used. .

In the above-described embodiment, the management number acquisition step S6 is performed before and after the steps in the manufacturing method of the pipe 1 in which the manufacturing order of the pipes is changed by extraction, re-insertion, or the like. However, the management number acquisition step may be performed in each step of the pipe manufacturing method other than before and after the step of changing the pipe manufacturing order due to extraction, re-insertion, or the like.

In said embodiment the tube 1 does not have a flange at the socket 20 . However, the tube may have a flange at the socket. In this case, the flange may be provided with characters, figures, etc. indicating the nominal diameter of the pipe, the manufacturing factory, the year of manufacture, the lot number, the manufacturer's mark, and the like.

In said embodiment the pipe 1 is a cast iron pipe made of ductile iron. However, the pipe may be other cast iron pipes or pipes manufactured by methods other than casting. Also, the tube may be made of a material other than iron.

INDUSTRIAL APPLICABILITY The present invention can be used to improve the traceability of a pipe having a straight pipe portion and a socket positioned at one axial end of the straight pipe portion.

1 Pipe 10 Straight pipe portion 11 Straight pipe portion inclined surface 20 Receiving port 20a Connecting portion 21 Base end portion 21a Stepped surface 22 Tip portion 23 Convex portion 25 Locking groove for rubber ring 26 Lock ring accommodating groove 27 Guide portion 28 Buffer space 30 Insertion opening 31 Insertion opening protrusion 31a Insertion opening inclined surface 31b Contact surface 41 Rubber ring 42 Lock ring 43 Lock ring holder 50 Control number display unit 100 Control number acquisition device 110 Imaging device 120 Removal device 130 Rotation drive device 131 Arm 132 Drive Part 140 Control device 150 Storage device M1 Casting mold M11 Socket forming part M12 Straight pipe forming part M2 Socket core M21 Core main body M21a Control number concave part M22 Flange part P Axis

Claims (6)

A pipe having a straight pipe portion and a socket positioned at one axial end of the straight pipe portion,
A management number display section containing a management number of the pipe is formed on a portion of the inner peripheral surface of the socket located on the straight pipe section side,
The control number display portion is formed by casting so as to protrude radially inward from the inner peripheral surface of the socket, and the control number is displayed on the inner peripheral surface of the socket in the axial direction of the pipe. are formed so that
tube . A method for manufacturing a pipe having a straight pipe portion and a socket positioned at one axial end of the straight pipe portion, the method comprising:
a socket core forming step of forming a socket core for casting the socket;
A control number concave portion for casting a control number of the pipe so as to line up in the axial direction on the inner peripheral surface of the socket is formed in a portion of the socket core located on the straight pipe portion side. a step of forming recesses for management numbers to be formed;
By using the socket core having the recess for the control number formed therein, the control number of the pipe is aligned in the axial direction on the portion of the inner peripheral surface of the socket located on the straight pipe portion side. a casting step of casting a pipe in which a control number display part containing the control number of the pipe is formed;
having
A method of manufacturing a tube. A method for manufacturing a tube according to claim 2 ,
an imaging step of imaging the management number formed on the inner peripheral surface of the socket with an imaging device;
an identification step of identifying the management number from the image captured by the imaging step;
a storage step of combining the management number identified by the identification step and the manufacturing information of the pipe and storing the combination in a storage device;
having
A method of manufacturing a tube. In the method for manufacturing a tube according to claim 3 ,
further comprising an annealing step of annealing the pipe cast in the casting step;
The imaging step is performed between the casting step and the annealing step,
A method of manufacturing a tube. In the method for manufacturing a pipe according to claim 3 or 4 ,
After the casting step and before the imaging step, a removing step of removing dust from a portion of the inner peripheral surface of the socket located on the straight pipe portion side is further provided.
A method of manufacturing a tube. A device for acquiring a management number of a pipe having a straight pipe portion and a socket located on one end side of the straight pipe portion,
a bar-shaped arm extending in the axial direction of the tube and rotatable about the axis of the tube;
It is possible to pick up an image of a control number display part fixed to the tip part of the arm part in the axial direction, containing the control number of the pipe and formed on the part of the inner peripheral surface of the socket located on the straight pipe part side. imaging device,
It is fixed to the distal end portion of the arm portion in the axial direction so as to be located in front of the imaging device in the rotational direction of the arm portion. a removal device capable of removing dust from a portion of the inner peripheral surface of the socket located on the straight pipe portion side;
having
Pipe management number acquisition device.

Images