JPH0696268B2 - Method for manufacturing resin composite pipe and connecting member used therefor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a resin composite pipe and a connecting member used therein.

(Prior Art) A pipe made of a thermoplastic resin such as hard vinyl chloride resin is
Although it has excellent corrosion resistance, it does not have high mechanical strength such as pressure resistance and impact resistance. Therefore, it is not sufficiently durable to be used in a severe environment, for example, as a piping material for a chemical plant in which a high temperature and high pressure chemical solution is transported or as a material for an underground buried pipeline that receives pressure from the outside. . Therefore, a resin composite pipe having improved mechanical strength while maintaining the excellent corrosion resistance of a thermoplastic resin has been proposed and is now widely used in various fields. This resin composite pipe is formed by laminating various outer layer constituent materials such as fiber reinforced thermosetting resin on the outer peripheral surface of the thermoplastic resin pipe.
By doing so, the desired mechanical strength is obtained.

Conventionally, for example, JP-A-57-207061 discloses the following two methods for producing such a resin composite pipe. First, the first method is to apply a surface treatment to the outer peripheral surface of the thermoplastic resin tube to enhance the adhesive effect with the fiber-reinforced thermosetting resin (hereinafter referred to as FRP), and then wind the FRP, Next, the resin concrete is wound on top of it, and finally the FRP is wound again. The second method is to insert the FRP-wound pipe into a mold with an FRP layer formed on the inner surface, and pour uncured resin concrete into the gap between the mold and the pipe to cure it. After unifying, the mold is removed.

(Problems to be Solved by the Invention) However, the above-described manufacturing method has the following problems.

That is, in the case of the first method, as shown in FIG. 20, the outer layer constituent material a such as FRP is spirally wound at a constant pitch except the both end portions of the tube.
At both ends of the winding start and the winding end, the outer layer constituent material a is wound several times along the tube end,
So-called extra winding is done. This extra winding must be performed so that the outer layer constituent material a does not wind around the chucking devices b, b supporting the pipe and that the end of the pipe is finished well. For this reason,
There was a problem that the laminated thickness of the outer layer constituent material a was inevitably different between both ends of the tube and the other part, and it was impossible to obtain a resin composite tube having a uniform outer layer constituent material layer over the entire length of the tube. . Further, since the winding pitch of the outer layer constituent material a is not uniform throughout, there is a problem that the appearance is deteriorated. Further, there is a problem that the work efficiency is poor and the productivity is poor because it is a so-called batch process in which the outer layer constituent material is wound around each of the thermoplastic resin tubes.

Also, in the case of the second method, a pipe wound with FRP is fitted into a mold with an FRP layer formed on the inner surface, and resin concrete is poured into the gap between the mold and the pipe to cure it. In such a method, batch processing is inevitable. Therefore, this method also has poor work efficiency,
There was a problem of poor productivity. In addition, since it is necessary to separately prepare a mold and form the FRP layer on the inner surface of the mold, the process becomes complicated. further,
The furnace for hardening the resin concrete needs to be adapted to the longest pipe, which causes a large-scale equipment and is economically disadvantageous.

The present invention was made in order to solve the problems with the above-mentioned conventional manufacturing method, and the resin composite pipe in which the thickness of the outer layer constituent material layer such as FRP is uniform over the entire length of the pipe can be efficiently and continuously formed. It is an object of the present invention to provide a method that can be manufactured and a connecting member used therein.

(Means for Solving the Problems) In order to achieve the above object, a method for manufacturing a resin composite pipe according to the present invention is configured such that a plurality of connecting members, each of which is a united body and a pair of separable division bodies, are provided in each division body. Divide and insert these divided bodies in advance at both ends of a plurality of regular length synthetic resin pipes, and then rotate these synthetic resin pipes one by one around the pipe axis to the pipe axis. As the synthetic resin pipe advances, the next synthetic resin pipe having the above-mentioned divided body at both ends is divided into the advancing synthetic resin pipe at the rear end side of the advancing synthetic resin pipe. Connect by joining the body and the divided body on the front end side of the next synthetic resin pipe, and successively connecting the synthetic resin pipes of the same size in the same manner, and connecting a plurality of synthetic resin pipes. The process of forming a core tube that consists of A step of winding and laminating an outer layer constituent material on the outer peripheral surface of the core tube advancing along to form a resin composite raw tube, and after curing the outer layer constituent material, the resin composite raw tube is replaced with each synthetic resin tube. And a step of sequentially cutting at the connecting portion to separate the resin composite tube into a regular length.

The connecting member used in the above-described manufacturing method is composed of a pair of divided bodies that can be combined and divided by a meshing or screwing means, and each divided body is fitted into the end of the synthetic resin pipe. A fitting portion, a collar portion formed on the outer peripheral edge of the base end of the fitting portion, and a meshing portion or a screwing portion formed at the base end of the fitting portion, wherein the height of the collar portion is It is made smaller than the wall thickness of the synthetic resin pipe.

(Operation) First, since the divided bodies of the connecting member are respectively attached to both ends of the plurality of regular-sized synthetic resin pipes, the synthetic resin pipes are integrated by integrating the facing divided bodies. The core tube is connected to form a core tube, and the core tube is advanced while rotating around the tube axis, and the outer layer constituent material such as FRP is spirally wound around the core tube with a constant bite. Then, the outer layer constituent material is cured to form a resin composite raw pipe, and then this raw pipe is cut at the connecting portion of the synthetic resin pipe. In the resin composite pipe thus obtained, the winding pitch of the outer layer constituting material is constant over the entire length of the pipe, that is, the outer layer constituting material layer has a uniform thickness, and the finish of the pipe end is also clean. At the same time, each process becomes continuous, and the productivity is greatly improved as compared with the conventional method in which batch processing is unavoidable.

Further, since the connecting member is composed of a divided body that can be combined and divided by a meshing or screwing means, the divided body is inserted into both ends of each synthetic resin pipe in advance to connect the synthetic resin pipes. Is smoothly performed, and the connected synthetic resin pipes do not slip at the connecting portion, and all rotate at the same speed. Therefore, winding disorder or the like does not occur in the outer layer constituent material wound around it. Further, by forming the collar portion at the boundary between both fitting portions, a gap is formed at the connecting portion of the synthetic resin pipe by the thickness of the collar portion (see FIG. 9, but this figure is divided. Shows the state just before the body is completely united.) As a result, when cutting the resin composite raw pipe and separating it into a standard length resin composite pipe, there is no risk of the cutting blade coming into contact with the internal synthetic resin pipe, and a resin composite pipe with a scratch on the pipe end is manufactured. There is nothing to be done. Furthermore, by making the height of the collar portion smaller than the wall thickness of the synthetic resin pipe, the collar portion does not protrude from the outer peripheral surface of the synthetic resin pipe (outer peripheral surface of the core pipe), and the outer layer constituent material is attached to the core pipe. When winding
There is no possibility that the outer layer constituent material rises up at the joint part of the synthetic resin tube and winding disorder occurs, and no cavity is formed between the outer layer constituent material and the core tube. There is no risk of contacting and damaging the connecting member, and the connecting member can be efficiently reused any number of times.

(Example) Hereinafter, the Example of this invention is described with reference to drawings.

FIG. 1 is a schematic view showing a method of manufacturing a resin composite pipe according to the present invention and a structure of a manufacturing apparatus used for the method.

First, the manufacturing apparatus will be described, and then the manufacturing method will be described together with the operation of the apparatus.

The manufacturing apparatus comprises a core pipe manufacturing means 1, a raw pipe manufacturing means 2, a raw pipe collecting means 3, and a cutting means 4, and a synthetic resin pipe manufacturing apparatus 5 is provided in the preceding stage of the manufacturing apparatus. is set up. Here, the synthetic resin pipe manufacturing apparatus 5 will be described. The apparatus 5 includes a pipe manufacturing machine 51 for continuously manufacturing a synthetic resin pipe B, and a synthetic resin pipe manufactured by the pipe manufacturing machine 51. The automatic cutting machine 52 cuts the pipe B into a predetermined size to form a synthetic resin pipe C of a fixed length. The pipe manufacturing machine 51 spirally winds a synthetic resin strip A having engagement portions (not shown) formed on both side edges into a tubular shape, and forms adjacent engagement portions with each other. The synthetic resin pipe B is manufactured by engaging with each other. Other than this, the pipe making machine 51 may be, for example, a so-called extruder that extrudes a molten resin to produce the synthetic resin pipe B.

Now, the core pipe manufacturing means 1 located at the first stage of the manufacturing apparatus of the present invention is connected to the synthetic resin pipe manufacturing apparatus 5 having the above-mentioned configuration via the pipe guide rail 61. This core tube manufacturing means 1
Is a synthetic resin pipe C which is guided from the synthetic resin pipe manufacturing apparatus 5 into the pipe guide rail 61 and is fed into the core pipe D by successively connecting and integrating the synthetic resin pipes C. Is sent to the next-stage raw pipe making means 2. The core tube producing means 1 having such a function receives a fixed length synthetic resin tube C, and a pedestal 11 that rotatably supports the tube C around its tube axis and a pedestal 11 supported on the pedestal 11. An extruding device 12 for extruding the synthetic resin pipe C in one direction along the pipe axis of the pipe C (in the case of this example, the right direction in FIG. 1) without hindering the rotational movement around the pipe axis, and the extrusion device 12. The synthetic resin pipe C extruded by the device 12 is sent out in the extrusion direction while being rotated around the pipe axis, and the sending device 13.
It is provided with a plurality of connecting members 14 for connecting and integrating the synthetic resin pipe C sent out by 13 and the next synthetic resin pipe C.

Reference numeral 63 in the drawing is a workbench for inserting the connecting member 14 into the synthetic resin pipe C.

The gantry 11 and the pushing device 12 are constructed as shown in FIGS. 2 and 3. Here, FIG. 2 is a partially omitted front view, and FIG. 3 is a right side view of the same.

First, the pedestal 11 will be described. The pedestal 11 receives, on a horizontal machine frame 111, eight support rollers 112 that receive the lower peripheral surface of the synthetic resin pipe C and the lowermost surface of the synthetic resin pipe C. Three guide rollers 113 ... Are provided and are installed in the vicinity of the end of the pipe guide rail 61. The eight support rollers 112 are arranged horizontally in two rows, and the support rollers 112, 112 in each row are arranged at predetermined intervals so that their axes are on the same straight line. Has been done. The interval between the rows is set smaller than the outer diameter of the synthetic resin pipe C. On the other hand, the three guide rollers 113
Are arranged so as to be orthogonal to the axis of the support rollers 112, respectively, and are separated by a predetermined distance between the rows of the support rollers 112.
They are arranged in rows. Also, these guide rollers 113 ...
Are provided at positions slightly lower than the support rollers 112. Each of the guide rollers 113 ... Can be laid down in the traveling direction of the synthetic resin pipe C (rightward in FIG. 1) as shown by the broken line in FIG.

The numbers of the support rollers 112 and the guide rollers 113, the installation intervals, and the like are not limited to the above examples, but may be appropriately determined according to the length, outer diameter, weight, etc. of the synthetic resin pipe C.

The pushing device 12 is installed on the rear end side of the gantry 11 described above. The pushing device 12 includes a horizontal machine frame 120, a dolly 121 slidably provided on the machine frame 120, and the dolly.
Extruder horizontally provided on 121 via supports 124, 124
125 and a cylinder 128 for moving the bogie 121 forward and backward. The dolly 121 is provided with guide wheels 122, and is guided by a guide rail 123 mounted on the machine frame 120 so as to be able to move forward and backward in a direction along the traveling direction of the synthetic resin pipe C. Extruder 125 has shaft 1
26 and an extruding plate 127 fixed to the tip of the shaft 126. The push-out plate 127 is a disk, and the shaft 126 is rotatably supported around the axis by support members 124, 124 having bearings, for example. Cylinder 128
Is operated by hydraulic pressure or air pressure, is arranged behind the dolly 121, and is connected to the dolly 121 via a rod 129. The extruding device 12 thus configured is provided such that the axis of the shaft 126 of the extruding tool 125 coincides with the tube axis of the synthetic resin tube C on the frame 11.

The configuration of the extrusion device 12 is not limited to the above-described example, and other configurations may be used as long as the synthetic resin pipe C can be extruded in one direction along the pipe axis without preventing its rotation. Good. For example, the synthetic resin pipe C is sandwiched or held via a plurality of rollers having an axis parallel to the pipe axis of the synthetic resin pipe C, and in that state, the synthetic resin pipe C is moved in the direction along the pipe axis. Things can be considered. In addition, the extrusion device 12,
The push-out plate 127 may be configured to be driven by a motor or the like and rotate in synchronization with the delivery device 13.

The delivery device 13 is located in front of the gantry 11, that is, on the opposite side of the extrusion device 12 and at a position where the synthetic resin pipe C extruded from the gantry 11 can be taken out along the pipe axis as it is. In addition, it is installed at a predetermined distance from the gantry 11. As shown in FIGS. 4 and 5, the delivery machine 13 comprises a plurality of delivery rollers 131 ... Arranged on the same circumference so as to contact the outer peripheral surface of the synthetic resin pipe C. Is. The delivery rollers 131, ... Have their axes inclined at a certain angle θ with respect to the delivery direction of the synthetic resin pipe C. Further, all or a part of the delivery rollers 131 ... Is connected to a drive source (not shown). Then, as the delivery rollers 131 ... Rotate in one direction (see arrow P in the figure), the synthetic resin pipe C is
It is sent out in one direction while being rotated around the tube axis (see arrows Q and R in the figure). The delivery speed of the synthetic resin pipe C can be easily adjusted by changing the inclination or rotation speed of the delivery rollers 131 ....

It should be noted that the gantry 11 described above may have the same configuration as the transmitter 13.

The connecting member 14 is, as shown in FIGS. 6 to 8, a pair of split bodies 1 which can be joined and split by a meshing means.
It is composed of 5,16. Each of these divisions 15,16
Each of the fitting portions 15 is formed of a synthetic resin material in a substantially cylindrical shape, and is fitted into the end portion of the synthetic resin pipe C.
1, 161, flanges 152 and 162 formed on the outer peripheral edges of the bases of the fitting portions 151 and 161, and meshing portions 153 and 163 formed on the base ends of the fitting portions 151 and 161. The fitting portions 151, 161 facilitate the attachment to the synthetic resin pipe C, and absorb the variation in the inner diameter of the synthetic resin pipe C and the dimensional error in the molding of the divided bodies 15, 16 themselves to form a composite. In order to improve the adhesion to the inner surface of the resin pipe C, it is advisable to gradually constrict it toward each tip. If the fitting portions 151 and 161 are formed in this way, respectively, the slip does not occur between the synthetic resin pipe C and the fitting portions 151 and 161 in both the circumferential direction and the axial direction. The lengths of the fitting portions 151 and 161 may be appropriately determined according to various conditions such as the inner diameter of the synthetic resin pipe C and the magnitude of the frictional force between the synthetic resin pipe C and the like. Further, the fitting portions 151 and 161 are chamfered at the outer peripheral edge portions 154 and 164, respectively. The chamfered portions 154 and 164 are for smoothly fitting the fitting portions 151 and 161 into the synthetic resin pipe C.

The outer peripheral surfaces of the fitting portions 151 and 161 do not necessarily have to be smooth. For example, the outer peripheral surface may have a plurality of concave grooves of any shape such as a V-shaped section, a U-shaped section, and a U-shaped section. May be formed along the axis. In this case, as compared with the case where the outer peripheral surface is smooth, the fitting portions 151, 161 and the synthetic resin pipe C are
The frictional force between the inner surface and the axial center increases.
For this reason, it is not necessary to increase the molding accuracy of the fitting portions 151 and 161 so much, which is convenient for molding.

When the resin composite pipe E is cut and separated into a fixed length resin composite pipe F in the final step, the flange portions 152 and 162 have a cutting blade with a raw pipe E.
A gap V is formed between the synthetic resin pipes C so that they do not come into contact with the inner ends of the synthetic resin pipes C (see FIG. 9. However, this diagram shows a divided body). 15,16
Shows the state just before they are completely united. ). Therefore, it is necessary that the thicknesses of the collar portions 152 and 162 be thicker than the thickness of the cutting blade during the assembling, that is, more than half the thickness of the cutting blade.
Further, when the synthetic resin pipes C ... Are connected to form the core pipe D,
The heights of the flanges 152, 162 are set to be smaller than the wall thickness of the synthetic resin pipe C so that the flanges 152, 162 do not project from the outer peripheral surface of the core pipe D. This is because, when the flange portions 152, 162 project from the outer peripheral surface of the core tube D, when the outer layer constituent material (241, 243, 253) is wound around the core tube D, the outer layer constituent material rises at the connecting portion of the synthetic resin tube C. This is because winding disorder occurs and a cavity is formed between the outer layer constituent material and the core tube D, which causes defective products.

Further, the meshing portions 153, 163 are a plurality of toothed protrusions 156 (166 in the drawing) formed at the base ends of the fitting portions 151, 161.
It consists of ... These tooth-like projections 156…, 166…
Are provided at equal intervals on the same circumference centered on the axis of the split bodies 15 and 16 and parallel to the axis. The tooth-shaped projections 156, 166, ... Are formed so as to mesh with each other. And the tooth-like projections 156…, 166…
By meshing with each other, the two divided bodies 15 and 16 are united, and at this time, the collar portions 152 and 162 of the respective divided bodies 15 and 16 are united. The size and the number of the tooth-shaped projections 156, 166, ... Are not limited to those shown in the figure. Further, the tooth-shaped projections 152, 162, ... Are formed inward of the collar portions 155, 165 (closer to the axial center of the divided bodies 15, 16), but the invention is not limited to this, and from the outer peripheral surface of the collar portions 152, 162. It is an arbitrary place within the range where it does not project. Further, the meshing portions 153, 16
The form of 3 is not limited to the above-mentioned embodiment, and may be, for example, as shown in FIG. 10 to FIG. 14 or FIG. 15 to FIG.

In the example shown in FIGS. 10 to 14, a plurality of (four in the drawing) tooth-like projections 157 are formed at the base end of one division body 15, and the tooth-like projections at the base end of the other division body 16. Engaging groove portions 167 that engage with the protrusions 157 are formed. Teeth 157 ...
Have locking claws 158 ... Protruding in the circumferential direction formed on one side of the tip, and the locking claws 158 ... face the same direction (clockwise direction in FIG. 11). On the other hand, the division body 16
The meshing groove portions 167 of each of the meshing groove portions 167 have the same size as or larger than the tooth-shaped projections 157.
Locking recesses 168 ... Into which the locking claws 158 of the tooth-shaped projections 157 are fitted are formed in the inner depths of the side surfaces of the respective ones 167.
Then, the tooth-like protrusions 157 of one of the divided bodies 15 thus formed.
Is inserted into the engagement groove portion 167 of the other divided body 16 and both or one of them is rotated in a predetermined direction, the locking claws 158 of the tooth-shaped projections 157 ... It is fitted in the locking recesses 168, so that the tooth-shaped projections 157 and the engagement groove portions 167 are engaged with each other, and the two divided bodies 15 and 16 are united.

In the example shown in FIG. 15 to FIG. 18, a plurality of (four in the drawing) tooth-like projections 159 ... Are formed at the base end of one division body 15, and at the inner peripheral edge of the base end of the other division body 16. An annular meshing groove portion 165 that meshes with the tooth-shaped projections 159 ... Is formed. The tooth-shaped projections 159 ... Are formed so that the shape of the cross section orthogonal to the axis of the divided body 15 is a wedge shape that is oriented in one direction (clockwise direction in FIG. 16). On the other hand, the meshing groove portion 165 of the divided body 16 has a depth substantially equal to the height of the tooth-like protrusions 159 ... And the width of the portion corresponding to the tooth-like protrusions 159. Is made substantially equal to the maximum thickness of the protrusions 159 ... And the inner peripheral surface between these portions rubs the outer peripheral surface of the tooth-shaped protrusions 159 ...
Has been made. And one of the divided bodies that looks like this
15 tooth-shaped projections 159 ...
When both or one of them is rotated in a predetermined direction while being inserted inside, the outer peripheral surface of the tooth-like projections 159 ...
65 ... tapered surface 169 ... comes into close contact. As a result, the tooth-shaped projections 159 and the meshing groove portions 165 are meshed with each other, and the two divided bodies 15 and 16 are combined.

In each of the embodiments described above, the divided bodies 15 and 16 are combined by the meshing portions 153 and 163 formed at the respective base ends, but the invention is not limited to this, and, for example, the 19th
As shown in the figure, the threaded portions 17 and 18 are formed at the base ends of the divided bodies 15 and 16, and the threaded portions 17 and 18 are screwed to combine the divided bodies 15 and 16. Good. Here, a male screw portion 171 is extended as the screwing portion 17 from the base end of one of the divided bodies 15, and the male screw portion 171 is formed as the screwing portion 18 on the inner peripheral surface of the other divided body 16. A female screw portion 181 that is screwed with is engraved.

When the structure of the connecting member 14 is set to the structure of each of the embodiments shown in FIG. 10 to FIG. 19, the divided bodies 15 and 16 are combined to form the divided body 15 in any of the examples. , 16 need to be rotated in a predetermined direction, the orientation of the locking claws 158, the direction of the wedges of the tooth-like projections 159, and the orientation of the screw portions 171, 181 of the screwing portions 17, 18 are respectively set. It is necessary to set it so as to correspond to the rotation direction of the synthetic resin pipe C.

Next, the raw pipe manufacturing means 2 will be described. This raw pipe making means 2 is placed at the next stage of the core pipe making means 1 described above, and the outer peripheral surface of the core pipe D sent out from the core pipe making means 1 while rotating around the pipe axis. Then, the outer layer constituent material is wound and laminated to manufacture the resin composite raw pipe E. The raw pipe manufacturing means 2 having such a function is composed of a surface treatment machine 21, an outer layer constituent material winding portion 22, and a curing furnace 26.
Reference numeral 27 in the figure denotes a roller for supporting the core tube D.

The surface treatment machine 21 is for subjecting the outer surface of the core tube D to, for example, sanding treatment so that the adhesion between the core tube D and the outer layer constituent material is enhanced. The surface treatment machine 21 is located next to the delivery machine 13 of the core tube producing means 1. The surface treatment machine 21 does not necessarily have to be provided.

The outer layer constituent material winding section 22 is for winding the outer layer constituent material such as FRP around the outer peripheral surface of the core tube D, and is provided next to the surface treatment 21. The outer layer constituent material winding section 22 is composed of two winding units, a filler filling unit 24 and an FRP winding unit 25. Filling material filling unit 24
Is a feeder 242 for feeding the filler 241 onto the FRP 243 in the lower layer, a guide roller 244 for winding the nonwoven fabric 243 covering the filler 241 and a pressing roller for pressing the wound nonwoven fabric 243. 245 and. Further, the FRP winding unit 25 includes an impregnation tank 252 for impregnating a glass fiber 251 knitted into a band with a thermosetting resin, and a glass fiber (FRP) 253 impregnated with the thermosetting resin as a core tube D. And a guide roller 254 for winding the FRP25 around the core tube D.
A pressing roller 255 for pressing down 3 is provided. Both the non-woven fabric 243 and the FRP 253 are spirally wound around the outer peripheral surface of the core tube D at a constant winding pitch,
It is supplied at a constant angle with respect to the tube axis of the core tube D. This angle is appropriately determined according to various conditions such as the outer diameter of the core tube D, the rotation speed and the transfer speed of the core tube D, and the like. Also, the core tube D
Is a non-woven fabric 243 and FRP25
3 is automatically wound around the core tube D. Therefore, both of the guide rollers 244 and 254 described above are usually fixed at one place.

The configuration of the outer layer constituent material winding portion 22 is not limited to the above-described one, and can be appropriately changed depending on the number of layers formed on the outer peripheral surface of the core tube D, the type of the outer layer constituent material, and the like. . In the above example, the glass fiber 251 is impregnated with the thermosetting resin before being wound.
It is also possible to wind only the core 251 around the core tube D and then impregnate it with a thermosetting resin by coating or the like.

The curing furnace 26 is for curing the outer layer constituent material such as the FRP 251 wound and laminated in the outer layer constituent material winding section 22 described above, and is arranged in the subsequent stage of the FRP winding unit 25. The curing furnace 26 includes a core tube D wound with an outer layer constituent material.
Can be covered from the surroundings, for example, a cylindrical shape.

Next, the raw pipe collecting means 3 will be described. This raw pipe taking-in means 3 is installed at the next stage of the above-mentioned raw pipe making means 2 and prevents the resin composite raw pipe E coming out of the raw pipe making means 2 from rotating. Instead, it is for picking up along the traveling direction of the raw tube E. The raw pipe taking-out means 3 having such a function has the same structure as the sending machine 13 of the core tube making means 1 described above, and its operation is the sending machine.
It is in sync with 13, or slightly slower.

The cutting means 4 is arranged next to the raw pipe collecting means 3. The cutting means 4 cuts the resin composite raw pipe E, which has been taken by the raw pipe taking means 3, at the connecting portion of the synthetic resin pipes C ... And separates it into the resin composite pipe F ... . The cutting means 4 having such a function is provided with a cutting blade (not shown) that cuts only the outer layer constituent material layer of the resin composite raw pipe 4, and cuts a fixed region along the pipe axial direction of the resin composite raw pipe E. It is provided so that it can reciprocate at a fixed cycle. The cutting means 4 is controlled by an appropriate control device (not shown), and when the connecting portion of the synthetic resin pipe C, which is the cutting position, comes to the position of the cutting blade, it is in the same direction as the moving direction of the raw pipe E. The raw pipe E is cut while moving at the same speed as the moving speed of the raw pipe E, and immediately returns to the initial position after cutting.

Incidentally, reference numeral 62 in the figure denotes a pipe transfer rail for receiving the resin composite pipes F of a fixed size cut and separated by the cutting means 4 and transferring them to a predetermined position.

Next, a method of manufacturing the resin composite pipe according to the present invention will be described together with the operation of the manufacturing apparatus described above.

First, the synthetic resin pipe B is continuously made by the pipe making machine 51 of the synthetic resin pipe making apparatus 5, and the synthetic resin pipe B is successively cut by the automatic cutting machine 52 to a predetermined size. The constant-length synthetic resin pipe C thus formed is guided by the pipe guide rail 61 after the divided bodies 15 and 16 of the connecting member 14 are inserted and attached to both ends of the worktable 63. One by one is sent to the gantry 11 of the core tube producing means 1. The work of inserting the divided bodies 15 and 16 of the connecting member 14 into the synthetic resin pipe C is effective if an appropriate device is prepared and automated, but may be manually performed as in this example.

When the synthetic resin pipe C is fed onto the imaginary space 11, the cylinder 128 of the extrusion device 12 operates and the rod 129 is extended.
Along with this, the dolly 121 moves forward toward the gantry 11, and the push-out plate 127 of the push-out tool 125 abuts on the divided body 16 at the rear end of the synthetic resin pipe C on the gantry 11. Further, when the rod 129 extends and the carriage 121 continues to move forward, the synthetic resin pipe C is pushed by the pushing plate 127 and moves forward on the gantry 11. At this time, the synthetic resin pipe C
Rub against the support rollers 112 ...
It is also supported by 13 ... so it moves forward smoothly.

In this way, the synthetic resin pipe C is extruded from the gantry 11 toward the sending machine 13. At this point, the sending machine 13 has already started up, and eventually the front end of the synthetic resin pipe C reaches the sending machine 13, and the sending roller 13 of the sending machine 13 reaches the outer peripheral surface of the front end.
When 1 ... Abuts, the rotating delivery rollers 131 ... Start the rotation of the synthetic resin pipe C around the pipe axis. At the same time, a pedestal supporting the latter half of this synthetic resin pipe C
The guide rollers 113 ... Of 11 fall down and separate from the synthetic resin pipe C, and the rear half of the synthetic resin pipe C is supported only by the support rollers 112. As a result, the synthetic resin pipe C
Rotates smoothly around the tube axis. Also, synthetic resin pipe C
Since the push-out plate 127 which is in contact with the divided body 16 at the rear end also rotates together with the synthetic resin pipe C, the rotational movement of the synthetic resin pipe C is not hindered at all. The guide rollers of the gantry 11
The falling of 113 ... may be performed immediately before the synthetic resin pipe C starts to rotate.

When the synthetic resin pipe C is sent out by the sending machine 13 as described above, it is not necessary to continue pushing the synthetic resin pipe C from the rear side, and therefore the cylinder 128 of the extrusion device 12 is not required.
The rod 129 is retracted, the carriage 121 is retracted accordingly, and the push-out plate 127 of the push-out tool 125 returns to the initial position. And
When the synthetic resin pipe C is completely separated from the base 11, the stopper (not shown) at the tip of the pipe guide rail 61 is released, and the next synthetic resin pipe C is fed onto the base 11. This synthetic resin pipe C also has split members of the connecting member 14 at both ends thereof.
15 and 16 are inserted respectively.

Immediately after the next synthetic resin pipe C is fed onto the gantry 11 as described above, the cylinder 128 of the extrusion device 12 is again actuated to push the synthetic resin pipe C on the gantry 11 forward as described above. . Here, the extrusion speed of the synthetic resin pipe C by the extrusion device 12 is set to a speed slightly higher than the delivery speed of the synthetic resin pipe C by the delivery device 13, and the synthetic resin before being delivered by the delivery device 12 is set. The rear end of the pipe C is the pedestal 11 and the sending machine.
While moving to and from 13, the synthetic resin pipe C on the gantry 11
Is designed to catch up with the previous synthetic resin pipe C.

When the synthetic resin pipe C on the pedestal 11 is pushed out by the pushing device 12, it is sent forward by the meshing portion 153 of the divided body 15 of the connecting member 14 inserted into the front end portion of this pipe C and the sending machine 13. Connecting member inserted in the rear end of the synthetic resin pipe C
Lightly meshes with the meshing portion 163 of the fourteen divided bodies 16. As a result, the rotational movement of the previous synthetic resin pipe C is transmitted to the synthetic resin pipe C on the gantry 11 via the divided bodies 15 and 16, and the synthetic resin pipe C on the gantry 11 also starts to rotate. At the same time, the guide rollers 113 ... Of the pedestal 11 fall down and separate from the synthetic resin pipe C in the same manner as described above. Furthermore, when the pushing device 12 continues to push the synthetic resin pipe C that is rotating on the gantry 11, the meshing state of the divided bodies 15 and 16 becomes tighter accordingly (see FIG. 9), and eventually. Both 15 and 16 are completely united. with this,
While the two synthetic resin pipes C, C have the same pipe axis and a predetermined gap V is formed between the pipe ends by the flange portions 152, 162 of the connecting member 14, the two synthetic resin pipes C, C The connection is complete. After that, the extrusion device 12 continues to push the synthetic resin pipe C on the gantry 11 until its front end reaches the delivery device 13 so that the meshed state of the divided bodies 15 and 16 of the connecting member 14 is not accidentally released. .

When the synthetic resin pipe C on the gantry 11 reaches the feeder 13, the extrusion device 12 returns the extrusion plate 127 to the original position. Then, when the synthetic resin pipe C is separated from the gantry 11, the stopper of the pipe guide rail 61 is released again and the next synthetic resin pipe C is fed onto the gantry 11. Thereafter, in the same manner as described above, the synthetic resin pipes C ... Are connected one after another via the connecting members 14, and thereby the core pipe D is continuously produced.

The core tube D produced by the core tube producing means 1 as described above is sent to the original pipe producing means 2. In the raw pipe manufacturing means 2, first, the surface treatment machine 21 applies a surface treatment such as a sanding treatment to the outer surface of the core tube D.

In the core tube D, since the gaps V ... Are formed at the connecting portions of the synthetic resin pipes C ... by the flange portions 152 and 162 of the connecting member 14, the gaps V ... Before or after the surface treatment is performed. After that, the surface of the core tube D may be smoothed by filling it with an appropriate filler. By doing so, it is possible to prevent winding disorder due to the edges of the outer layer constituent material being caught in the gap V when the outer layer constituent material is wound later. Further, at the time of cutting in the final step, the cutting blade is less likely to reach the flange portions 152 and 162 of the connecting member 14 due to the resistance of the filler, and the connecting member 14 can be prevented from being damaged by the cutting blade.

Subsequently, the core tube D is sent to the outer layer constituent material winding section 22, where the outer layer constituent material layer is formed on the outer peripheral surface. In the present embodiment, as described above, the outer layer constituent material winding portion 22 is provided with the filler filling unit 24 and the FRP winding unit 25, so that the outer peripheral surface of the core tube D is filled with the filler. Two layers of 241 and FRP 253 are formed. And these fillers 241, non-woven fabric 2
43 and the FRP 253, since the core tube D is constantly advancing while rotating at a constant speed, the core tube D is spirally wound around the core tube D at a constant pitch all the time, and the core tube D has a constant outer peripheral surface. The outer layer constituent material layer having a thickness is continuously formed.

In this way, after the outer layer constituent material layer is formed, the core tube D advances while rotating in the curing furnace 26, during which the outer layer constituent material layer is cured to become the resin composite raw tube E.

The raw resin composite pipe E produced as described above is taken by the raw pipe take-up means 3 while being rotated, and sent to the next cutting means 4.

The cutting means 4 waits at the predetermined position for the resin composite raw pipe E sent from the raw pipe taking-out means 3, and at the same time when the connecting portion of the synthetic resin pipe C ... The movement starts in the same direction as that of the original pipe E.
Since the length of the synthetic resin pipe C and the traveling speed of the raw pipe E are constant, the timing of starting this movement can be easily determined based on those values. Then, the cutting means 4 cuts the raw pipe E at the connecting portion while moving at the same speed as the traveling speed of the resin composite raw pipe E. When the cutting is completed, the cutting means 4 returns to the original position and prepares for the next cutting. Here, since the cutting means 4 cuts only the outer layer constituent material layer of the resin composite raw pipe E and does not cut the connecting member 14 inside the raw pipe E, the resin composite pipe F obtained by this cutting is The pipe E is connected to the front end of the pipe E via a connecting member 14. Therefore, each time the cutting is completed, the resin composite pipe F is pulled to be separated from the resin composite raw pipe E, and at the same time, the connecting member 14 is attached to the front end of the raw pipe E and the rear end of the resin composite raw pipe F. Remove the split bodies 16 and 15. The separated resin composite original pipe F is carried to a predetermined place by the pipe transfer rail 62, and the divided bodies 15 and 16 of the removed connecting member 14 are returned to the workbench 63 for repeated use.

As described above, a resin composite pipe of a fixed length in which the thickness of the outer layer constituent material layer is uniform over the entire length is continuously manufactured.

(Effects of the Invention) As described above, according to the present invention, it is possible to efficiently and continuously manufacture a resin composite pipe in which the outer layer constituent material layer such as FRP has a uniform thickness over the entire length of the pipe. Therefore, the productivity can be dramatically improved as compared with the conventional manufacturing method.

[Brief description of drawings]

1 to 19 show an embodiment of a method for producing a resin composite pipe and a connecting member used for the same according to the present invention, FIG. 1 is a schematic diagram showing a production process and a production apparatus, and FIG. 2 is a core pipe. 3 is a front view of an extruding device and a gantry of the pipe producing means, with parts omitted;
FIG. 4 is a right side view of the same, FIG. 4 is a schematic front view showing the structure of a feeder of core tube producing means, FIG. 5 is a left side view of the same, and FIGS. FIG. 6 is a cross-sectional view showing the inserted state of one of the divided members constituting the connecting member, FIG. 7 is a view taken along the line I--I shown in FIG. 6, and FIG. 8 is a connecting member. A sectional view showing the inserted state of the other divided body, FIG. 9 is a sectional view showing a state immediately before the divided bodies shown in FIGS. 6 to 8 are combined, and FIGS. 10 to 14 are divided bodies. FIG. 10 shows another embodiment of the present invention, FIG. 10 is a cross-sectional view showing an inserted state of one of the divided members constituting the connecting member, FIG. 11 is a view taken along the line II-II shown in FIG. Is a partial cross-sectional view showing a tooth-shaped projection, FIG. 13 is a cross-sectional view showing the inserted state of the other divided body constituting the connecting member, FIG. 14 is a view taken along the line III-III shown in FIG. 15 to 18 show the connection member further. Shows an embodiment, cross-sectional view FIG. 15 showing the insertion state of one of the divided body, FIG. 16 No. 15
IV-IV line view shown in the drawing, FIG. 17 is a cross-sectional view showing the inserted state of the other divided body constituting the connecting member, FIG. 18 is a V-V line view shown in FIG. FIG. 19 is a half sectional view showing still another embodiment of the connecting member, and FIG. 20 is a front view for explaining a conventional method for manufacturing a resin composite pipe. DESCRIPTION OF SYMBOLS 1 ... Pipe manufacturing means 11 ... Frame, 12 ... Extrusion device 13 ... Delivery device 14 ... Connection member 15, 16 ... Divided body 151,161 ... Fitting part 152,162 ... Collar part 153,163 ... Engagement part 156,157,159 ... Tooth-like projection 166 ... Tooth shape Protrusions 167, 168 ... Locking grooves 17, 18 ... Threaded portion 2 ... Original pipe making means 22 ... Outer layer material winding part 26 ... Curing furnace 3 ... Original pipe take-up means 4 ... Cutting means 5 ... Synthetic resin pipe making Device 61 ... Pipe guide rail 62 ... Pipe transfer rail 63 ... Work table A ... Filler, B ... Synthetic resin pipe C ... Regular length synthetic resin pipe, D ... Core pipe E ... Resin composite original pipe, F ... Resin composite pipe

Claims (2)

[Claims] 1. A plurality of connecting members each of which is composed of a pair of divided bodies that can be combined and divided, are divided into respective divided bodies, and these divided bodies are previously provided at both ends of a plurality of fixed-length synthetic resin pipes. After being attached, these synthetic resin pipes are advanced one by one along the pipe axis while rotating around the pipe axis one by one, and are divided into the advancing synthetic resin pipes in the same manner as this synthetic resin pipe. The following synthetic resin tube with the body at both ends,
Connect by joining the divided body on the rear end side of the advancing synthetic resin pipe and the divided body on the front end side of the next synthetic resin pipe, and then connecting the fixed length synthetic resin pipe in the same manner. A step of sequentially forming a core tube formed by connecting and integrating a plurality of synthetic resin tubes, and winding an outer layer constituent material around the outer peripheral surface of the core tube that advances along the tube axis while rotating around the tube axis. A step of forming a resin composite raw pipe by stacking, and a step of cutting the resin composite raw pipe after the outer layer constituent material is cured at the connecting portion of each synthetic resin pipe to separate the resin composite pipe into a regular length. A method for producing a resin composite pipe, comprising: 2. A pair of divided bodies which can be combined and divided by a meshing or screwing means, and each divided body has a fitting portion to be fitted into an end portion of a synthetic resin pipe, and a fitting portion of this fitting portion. A collar portion formed on the outer peripheral edge of the base end, and a meshing portion or a screwing portion formed on the base end of the fitting portion, wherein the height of the collar portion is larger than the wall thickness of the synthetic resin pipe. The connecting member used in the method for producing a resin composite pipe according to claim 1, wherein the connecting member is made small.