JPH03110132A - Manufacture of resin composite pipe - Google Patents

Abstract

PURPOSE:To manufacture a resin composite pipe, from both end sections of which the blank surfaces of thermoplastic resin pipes are exposed, efficiently and continuously by successively connecting synthetic resins through connecting members, the insides of which have bodies to be detected. CONSTITUTION:A plurality of synthetic resin pipes in standard length are coupled by connecting members 14, the insides of which have bodies to be detected, and a core pipe is manufactured while the core pipe is moved forward as being turned around a pipe axis, each connecting section of the synthetic resin pipes is coated with mold release films 211, and an outer layer component 20 such as FRP is wound spirally on the outer circumferential surface of the core pipe at regular pitches. The outer layer component is cured, a resin composite original pipe E is manufactured, and the positions of the bodies to be detected existing in the original pipe are detected by detecting means 46. Notches in depth reaching up to the mold release films are formed at positions separate at fixed distances in both directions along the direction of the pipe axis from the locations of the detection while using the locations of the detection as references, and the resin composite original pipe in standard length and the connecting members are separated from said original pipe by pulling the nose section of the resin composite original pipe.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a resin composite pipe.

(Prior art) Pipes made of thermoplastic resins such as hard vinyl chloride resin have excellent corrosion resistance, but they do not have very high mechanical strength such as pressure resistance or impact resistance, so they cannot be used in harsh environments. For example, it was not sufficiently durable for use as a piping material for chemical plants where high-temperature, high-pressure chemical solutions are transported, or as a material for underground pipes that are subject to external pressure.

Therefore, resin composite pipes have been proposed that have improved mechanical strength while retaining the excellent corrosion resistance of thermoplastic resins, and are currently widely used in various fields.

This resin composite pipe is made by laminating various outer layer constituent materials, including fiber-reinforced thermosetting resin, on the outer peripheral surface of a thermoplastic resin pipe, and by doing so, it achieves the desired mechanical strength. ing.

Conventionally, as methods for manufacturing such resin composite pipes, the following two methods have been disclosed, for example, in Japanese Patent Application Laid-Open No. 57-207061.

First, the first method is to apply a surface treatment to the outer circumferential surface of a thermoplastic resin pipe to increase the adhesive hardening with fiber-reinforced thermosetting resin (hereinafter referred to as FRP), and then wrap the FRP around it. Next, resin concrete is wrapped around it, and finally FRP is wrapped around it again.

The second method is to fit a pipe wrapped with FRP 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 and allow it to harden. After integrating the two, the mold is removed.

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

That is, in the case of the first method, as shown in FIG. 14, the outer layer constituent material a such as FRP is spirally wound at a constant pitch in the parts other than both ends of the tube. At both ends, which are the beginning and end of the winding,
The outer layer constituting material a is wound several times along the tube end, so-called extra winding.

This extra winding is attached to the chucking device that supports the tube.
This must be done to prevent the outer layer constituent material a from wrapping around b and to improve the finish of the tube end. For this reason, there inevitably arises a difference in the laminated thickness of the outer layer constituent material a between both ends of the pipe and the other parts, making it impossible to obtain a resin composite pipe with a uniform outer layer constituent material layer over the entire length of the pipe. was there.

Furthermore, since the winding pitch of the outer layer constituent material a is not uniform throughout, there was also a problem that the appearance deteriorated. Furthermore, since the process involves a so-called batch process in which the outer layer material is wound around each thermoplastic resin tube one by one, there are problems in that work efficiency is poor and productivity is poor.

In addition, in the case of the second method, a tube wrapped 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 tube and hardened. , such a method requires batch processing. Therefore, this method also has the problem of poor working efficiency and poor productivity. Furthermore, since it is necessary to separately prepare a mold and form an FRP layer on its inner surface, there is a problem that the process becomes complicated.

Furthermore, we have installed a furnace for curing resin concrete.
It is necessary to make it suitable for the longest pipe, and this requires large-scale equipment, which is economically disadvantageous.

Furthermore, in any of the above methods, in order to ensure the connection strength between pipes or pipe joints and to improve the efficiency of the connection work, resin composite pipes made by exposing the bare surfaces of thermoplastic resin pipes at both ends in advance are directly and continuously connected. It was not something that could be obtained.

The present invention has been made in order to solve the problems of the conventional manufacturing method described above, and has a method in which the thickness of the outer layer constituent material layer such as FRP is uniform, and the bare surface of the thermoplastic resin pipe is exposed at both ends. The object of the present invention is to provide a method that can efficiently and continuously manufacture resin composite tubes.

(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing a resin composite pipe according to the present invention includes rotating a synthetic resin pipe of a fixed length around the pipe axis and advancing it along the pipe axis. At the same time, at the rear end of this synthetic resin pipe, a synthetic resin pipe of the same fixed length is installed, which has an object to be detected inside and transmits the rotational movement and forward movement of the previous synthetic resin pipe to the subsequent synthetic resin pipe. The two pipes are connected through a connecting member such that the connecting portion of the two pipes coincides with the position of the object to be detected, and the synthetic resin pipes of a fixed length are successively connected in the same manner to connect the plurality of synthetic resin pipes. a step of forming a core tube in which the synthetic resin tubes are connected and integrated; and sequentially covering each connecting portion of the synthetic resin tube with a release film of a predetermined width in the core tube, which moves forward along the tube axis while rotating around the tube axis. After that, there is a step of winding and laminating an outer layer constituent material around the outer circumferential surface of the core tube to form a resin composite original tube, and a step of forming a resin composite original tube by winding and laminating an outer layer constituent material on the outer circumferential surface of the core tube, and after curing the outer layer constituent material, detecting the detected object present inside the resin composite tube. The position is detected by a detection means, and with the detected position as a reference, incisions are made at predetermined distances in both directions along the tube axis from the position to reach the release film, and then the resin composite material is The method includes the step of sequentially separating a fixed-length resin composite pipe with bare surfaces of the synthetic resin pipe exposed at both ends and the connecting member from the pipe.

(Function) A plurality of synthetic resin pipes of a fixed length are connected by a connecting member having an object to be detected inside to form a core pipe, and this core pipe is moved forward while rotating around the pipe axis to form a synthetic resin pipe. After covering each connecting portion with a release film, an outer layer forming material such as FRP is spirally wound around the outer peripheral surface of the core tube with a certain pinch.

After the outer layer constituent material is cured to form a resin composite master tube, the position of the object to be detected existing inside the master tube is detected by a detection means. Here, at the time of connection, the position of the object to be detected and the connection part are made to coincide, so the detected position corresponds to the connection part of the synthetic resin pipes, that is, the pipe end of each synthetic resin pipe. After detecting the end of the tube in this way, a cut with a depth that reaches the release film is made at a location a predetermined distance away from the detected position in both directions along the tube axis.

The dimension of the cut made in this manner from the detection position is such that the bare surface of the synthetic resin tube is exposed at both ends of the resulting resin composite tube. Thereafter, the resin composite master tube of a fixed length and the connecting member are separated from the resin composite master tube by pulling the tip end of the resin composite master tube.

In the resin composite pipe obtained in this way, the winding pitch of the outer layer constituent material is constant throughout, that is, the thickness of the outer layer constituent material layer is uniform, and the plain surface of the synthetic resin pipe is exposed at both ends by a predetermined dimension. Become something.

Additionally, each process is continuous, greatly improving productivity compared to conventional methods that require batch processing.

In addition, the connecting member that connects and integrates synthetic resin pipes of a fixed length has a detected object inside it, and the connecting member and each synthetic resin pipe are connected to each other and the detected object is connected to each other. By detecting the position of the object to be detected, it is possible to accurately determine the connecting portion of the synthetic resin pipe that is covered by the outer layer component and cannot be seen. Therefore, the cut can be made at the correct position with respect to the synthetic resin tube base tube, and the exposed dimension of the bare surface of the synthetic resin tube is always constant.

Furthermore, even if the synthetic resin pipes that are connected and integrated have different lengths, it is possible to definitely find the connection site of the synthetic resin pipes and make a cut at a predetermined position. As a result, it becomes possible to obtain a wide variety of resin composite tubes with different lengths through a series of steps.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

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

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

The manufacturing device is composed of a core tube making means 1, a raw tube making means 2, a raw tube taking means 3, and an outer layer cutting means 4. A synthetic resin tube making device (Fig. (not shown) is installed.

Here, I would like to explain about the synthetic resin pipe manufacturing equipment.
This equipment consists of a pipe manufacturing machine that continuously manufactures synthetic resin pipes, and an automatic cutting machine that cuts the synthetic resin pipes produced by this pipe manufacturing machine into predetermined dimensions to make synthetic resin pipes of a fixed length. It is composed of.

A pipe making machine, for example, spirally winds a band-like body made of synthetic resin with retaining parts formed on both sides to form a cylinder, and also engages adjacent engaging parts to form a synthetic resin. It is used to manufacture resin pipes.

In addition, the pipe-making machine may be, for example, a so-called extruder that produces a molten resin pipe.

Now, the core tube manufacturing means 1 located at the first stage of the manufacturing apparatus of the present invention includes a synthetic resin tube manufacturing device (not shown) having the above configuration,
They are connected via a tube guide rail 61.

A workbench 51 is provided at the base end of the tube guide rail 61, and the connecting member 14 is fitted onto one end (the right end in the figure) of the synthetic resin pipe C on the workbench 51.

Then, with the connecting member 14 fitted into one end, the synthetic resin pipe C is guided along the pipe guide rail 61 to the core pipe making means 1.
is moved.

The core pipe manufacturing means 1 connects and integrates synthetic resin pipes C of fixed length guided by the pipe guide rail 61 one after another via the connecting member 14 to manufacture a core pipe DK. , this core pipe is sent to the next stage, raw pipe manufacturing means 2.

The core tube manufacturing means 1 having such a function includes a pedestal 11 that receives a synthetic resin tube C of a fixed length and supports this tube C rotatably around its tube axis, and a pedestal 11 supported on the pedestal ll. an extrusion device 12 for extruding a synthetic resin tube C in one direction along the tube axis of the tube C (rightward in FIG. 1 in this example) without hindering rotational movement around the tube axis; It is equipped with a feeder 13 that sends out the synthetic resin tube C extruded by the device 12 in the extrusion direction while rotating it around its tube axis, and the front end portion of the synthetic resin tube C that is fed out by the feeder 13. The connecting member 14 is connected to the rear end of the synthetic resin pipe C at the front (on the right side in the figure), and the two synthetic resin pipes C and C are rotated together by the feeder 13.

The pedestal 11 and extrusion 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 explained. This pedestal 11 has an 8-8 frame on a horizontal machine frame 111 that receives the lower circumferential surface of the synthetic resin pipe C.
and three guide rollers 113 for receiving the lowermost surface of the synthetic resin pipe C, and are installed near the end of the pipe guide rail 61 described above. There is.

The eight support rollers 112... are arranged horizontally in two rows, and the support rollers 112... in each row are arranged at predetermined intervals so that their axes are located on the same straight line. It is set up.

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 in a row with a predetermined interval between the rows of support rollers 112, so as to be perpendicular to the axes of the support rollers 112, respectively.

Further, these guide rollers 113... are each provided at a slightly lower position than the support rollers 112.... Each guide roller 113... is moved in the traveling direction of the synthetic resin pipe C (the first
It can be tilted to the right (in the figure).

The number, installation interval, etc. of the support rollers 112 and the guide rollers 113 are not limited to the above-mentioned example, and are appropriately determined according to the length, outer diameter, weight, etc. of the synthetic resin pipe C.

The extrusion device 12 is installed on the rear end side of the pedestal 11 described above. This extrusion device 12 has a horizontal machine frame 120
and a truck 12 slidably provided on this machine frame 120.
1, and a cylinder 128 for moving the truck 121 forward and backward.

The truck 121 is equipped with guide wheels 122, and the machine frame 12
It is guided by a guide rail 123 mounted on the synthetic resin pipe C so that it can move forward and backward in the direction in which the synthetic resin pipe C travels.

The extrusion tool 125 includes a shaft 126 and this shaft 12.
6 and an extrusion plate 127 fixed to the tip.

The extruded plate 127 is a disc having a diameter slightly larger than the outer diameter of the synthetic resin pipe C, and the shaft 126 is rotatably supported around its axis by supports 124, 124 equipped with bearings, for example. There is.

The cylinder 128 is operated by hydraulic pressure or pneumatic pressure, and is arranged at the rear of the above-described truck 121 and connected to the truck 121 via a rod 129.

The extrusion device 12 configured as described above is provided so that the axis of the shaft 126 of the extrusion tool 125 coincides with the tube axis of the synthetic resin pipe C on the pedestal 11 described above.

The configuration of the extrusion device 12 is not limited to the example described above, and other configurations may be used as long as the synthetic resin tube C can be extruded in one direction along the tube axis without interfering with its rotation. good.

For example, it has a structure in which the synthetic resin pipe C is held or gripped via a plurality of rollers whose axes are parallel to the pipe axis of the synthetic resin pipe C, and the synthetic resin pipe C is moved in a direction along the pipe axis in this state. I can think of things. Further, the extrusion device 12 may be configured such that the extrusion plate 127 is driven by a motor or the like and rotates in synchronization with the delivery device 13.

The feeder 13 is located in front of the pedestal 11, that is, on the opposite side from the above-mentioned extrusion device 12, and at a position where the synthetic resin pipe C extruded from the pedestal 11 can be taken out as it is along the tube axis. It is installed at a predetermined distance from the pedestal 11. This sending device 13 is shown in FIGS. 4 and 5.
As shown in the figure, a plurality of delivery rollers 131 are arranged on the same circumference so as to come into contact with the outer peripheral surface of the synthetic resin pipe C.
It consists of...

The respective axes of the delivery rollers 131 are inclined at a certain angle θ with respect to the delivery direction of the synthetic resin pipe C.

Further, all or part of these delivery rollers 131 are connected to a drive source (not shown).

Then, by rotating the delivery roller 131 in this way in one direction (see arrow P in the figure), the synthetic resin pipe C is sent out in one direction while being rotated around its pipe 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 rotational speed of the delivery rollers 131.

Note that the above-mentioned pedestal 11 may have a configuration similar to that of the sending device 13.

The connecting member 14 is a substantially cylindrical member molded from a synthetic resin material, and as shown in FIGS. 6 and 7, one end thereof has a fitting part 141 that is fitted into the end of one synthetic resin pipe C. The other end is a fitting part 142 that is fitted into the end of the other synthetic resin pipe C.

These fitting parts 141 and 142 are formed concentrically, and each fitting part 141 and 142 has a synthetic resin pipe C2.
When C is connected, both tube axes are designed to match.

Further, the fitting portions 141 and 142 are each gradually narrowed toward the tip. This is to absorb variations in the inner diameter of the synthetic resin pipe C and dimensional errors in the molding of the connecting member 14 itself, and to improve the adhesion between the fitting portions 141 and 142 and the inner surface of the synthetic resin pipe C. .

By forming the fitting parts 141 and 142 in this way, the synthetic resin pipe C and the fitting parts 141 and 14
2, there is no slippage in either the circumferential direction or the axial direction.

Note that the fit-in portions 141 and 142 are narrowed depending on the fit-in portion 14.
The length of the connecting member 142 itself, the inner diameter of the synthetic resin pipe C, the magnitude of the frictional force with the synthetic resin pipe C, the molding precision of the connecting member 14 itself, etc. are appropriately determined according to various conditions.

Further, the outer circumferential edges of the tips of the fitting portions 141 and 142 are chamfered 143 and 144, respectively.

The chamfered portions 143, 144 are for positioning the synthetic resin pipe C and the connecting member 14, and for smoothly fitting the fitting portion 1, 41, 142 into the synthetic resin pipe C. The inclination angle and width of the chamfered parts 143 and 144 are determined by the inset part 1.
41 and 142, it is determined as appropriate depending on various conditions.

Furthermore, a flange portion 145 is formed over the entire circumference at the boundary portion between the two fitting portions 141 and 142, that is, at the center portion in the longitudinal direction.

Note that the connecting member 14 is not limited to having a smooth outer circumferential surface of the fitting portions 141, 142. For example, as shown in FIG. 8 and FIG. The grooves 146 may be formed along the axis.

In this case, the shape of the groove 146 may be any shape, such as a V-shaped cross section, a U-shaped cross section, or a U-shaped cross section.

In this way, the grooves 14 are formed on the outer peripheral surfaces of the fitting parts 141 and 142.
6... can increase the frictional force in the direction around the axis between the fitting part 141, 142 and the inner surface of the synthetic resin pipe C compared to a smooth outer peripheral surface, and also This is convenient in terms of molding since it is not necessary to make the molding precision of the portions 141 and 142 so high.

In this connecting member 14 as well, the outer periphery of the tip end of the fitting portions 141 and 142 is chamfered 143.1.
44, and a flange 145 is formed at the boundary between the fitting parts 141 and 142.

Furthermore, the object to be detected 8 is fitted into the longitudinal center of the connecting member 14 .

The detected object 8 is composed of an antenna coil and a resonator, vibrates with an excitation signal that excites the resonator, and emits the resonance signal remaining in the resonator from the antenna coil after the excitation signal stops. It is.

The detected object 8 configured as described above is configured such that the axis of its antenna coil coincides with the axis of the connecting member 14.

As the resonator, a piezoelectric vibrator such as a crystal resonator is used, for example.

In this way, when a piezoelectric vibrator is used as a resonator, the amount of energy stored in it is large, so the resonance signal relative to the excitation signal can be made large, and the number of turns of the antenna coil can be reduced to a few turns at most. can. Therefore, the detected object 8 itself can be downsized.

Note that the object to be detected 8 may be configured with a similar LC resonant circuit.

In addition, items that emit lines of magnetic force such as permanent magnets,
Alternatively, it may be a metal that can be detected with a metal detector.

Next, the raw tube manufacturing means 2 will be explained. This raw tube manufacturing means 2 is placed next to the core tube manufacturing means 1 described above, and is used to synthesize the core tubes sent out from the core tube manufacturing means 1 while rotating around the tube axis. After sequentially covering each connecting portion of the resin tube C (where the connecting member 14 is located) with a synthetic resin release film 211 of a predetermined width, the outer layer constituent material 20 is wound around the outer peripheral surface of the core tube. The resin composite master tube E is manufactured by laminating them. As the release film 211, polyethylene terephthalate resin, for example, is preferably used.

The raw tube manufacturing means 2 having such functions includes a release film winding section 21, an outer layer constituent material winding section 22, and a curing furnace 26.
It is composed of. In addition, the code|symbol 27 in a figure has shown the roller for supporting a core pipe.

The release film winding section 21 is disposed at the next stage of the core tube manufacturing means 1, and as shown in FIG.
1 are provided with approximately the same length in the left and right directions in the axial direction centering on the position of the collar portion 145 at the longitudinal center of the connecting member 14 in the core pipe.

The outer layer constituent material winding part 22 is an outer layer constituent material 2 such as FRP.
This is for winding the film around the outer peripheral surface of the core tube, and is provided next to the release film winding section 21.

This outer layer constituent material winding part 22 is a filler filling unit 2
4 and an FRP winding unit 25. In this embodiment, the outer layer constituent material winding section 22 is composed of two winding units, but is not limited to this, and may be composed of three or more winding units.

The filler filling unit 24 includes a feeder 242 for supplying the filler 241 onto the outer surface of the core pipe, and a feeder 242 for supplying the filler 241 onto the outer surface of the core tube.
guide roller 24 for winding the nonwoven fabric 243 covering the
4 and a presser roller 245 for pressing down the wound nonwoven fabric 243.

The FRP winding unit 25 includes an impregnated layer 25 for impregnating glass fibers 251 knitted in a band shape with a thermosetting resin.
2 and glass fiber (FRP) impregnated with thermosetting resin
A guide roller 254 for winding the FRP 253 around the core tube, and a press roller 255 for pressing down the FRP 253 wound around the core tube are provided.

The nonwoven fabric 243 and the FRP 253 are both supplied at a constant angle to the tube axis of the core tube so that they are spirally wound around the outer peripheral surface of the core tube at a constant winding pitch.

This angle is appropriately determined depending on various conditions such as the rotational speed of the core pipe and the transfer speed. In addition, since the core tube advances while rotating, the nonwoven fabric 243 and FRP 253 are automatically wound around the core tube. Therefore, any of the guide rollers 244 and 254 described above are usually placed at one location. remains fixed.

Note that the configuration of the outer layer constituent material winding portion 22 is not limited to that described above, and can be changed as appropriate depending on the number of layers formed on the outer peripheral surface of the core pipe, the type of outer layer constituent material, etc. . In addition, although the glass fiber 251 is impregnated with a thermosetting resin and then wound, only the glass fiber 251 is wound around a core pipe, and then the thermosetting resin is applied to it and impregnated. You can.

The curing furnace 26 is for curing the outer layer forming material 20 such as FRP 253 which is wound and laminated in the outer layer forming material winding part 22, and is arranged after the FRP first winding unit 25. There is.

The curing furnace 26 has a cylindrical shape, for example, and can cover the core tube around which the outer layer constituent material 20 is wound.

Next, the original pipe collection means 3 will be explained. This raw tube take-up means 3 is installed at the next stage of the raw tube manufacturing means 2 described above, and prevents the movement of the resin composite raw tube E that comes out of the raw tube manufacturing means 2 while rotating. This is for taking the original tube E along the direction of movement. The raw pipe take-up means 3 having such a function has the same configuration as the sending machine 13 of the core tube manufacturing means 1 described above, and its operation is synchronized with the sending machine 13 or slightly slower. It is.

An outer layer cutting means 4 is installed next to the original pipe taking-off means 3. The outer layer incision means 4 will be explained below.

The outer layer cutting means 4 cuts the outer layer constituting material 20 at the connecting portion of the resin composite tube E until it reaches the release film 211 while running alongside the resin composite tube E.

This outer layer incision means 4 is connected to a main body 44 suspended from a guide rail 42 installed on the transfer path of the resin composite raw tube E via running rollers 43, and a resin composite raw tube from the lower end of the main body 44. Support arm 4 extending below the transfer path of E
5, a detector 41 attached to the upper surface of the distal end of the support arm 45, and a detector 41 mounted at a predetermined interval on the upper part of the main body 44 so as to be located directly above the detector 41 (synthesis of the connecting portion of the resin composite master tube E). Release film 211 wound around the outer peripheral surface of the resin tube C
A pair of saw blades 46, 46 arranged at a distance substantially equal to the width dimension of the main body 44, a detector 41, and a saw blade 46.
6, and a control section (not shown) for controlling each operation.

The detector 41 has a function of transmitting an excitation signal to the resonator of the detected object 8 and a function of receiving a resonance signal transmitted from the detected object 8, and has a transmitter for transmitting the excitation signal. The mode and the reception mode for receiving the resonance signal can be switched periodically or at any time by the control section.

The detector 41 configured as described above includes an oscillator (not shown) that generates an excitation signal that excites the resonator of the detected object 8, and an oscillating section (not shown) that transmits the excitation signal generated by this oscillating section and A loop antenna 411 for receiving a resonance signal transmitted from the antenna 8 is provided.

As shown in FIG. 11, the loop antenna 411 is provided so that its loop surface is parallel to the transfer path of the resin composite tube E, that is, parallel to the axis of the antenna coil 81 of the detected object 8. There is.

As a result, the signal level of the resonance signal S received by the loop antenna 411 becomes minimum when the antenna coil 81 of the detected object 8 is located on the axis 412 of the loop antenna 411, as shown in FIG. , changes to reach a maximum before and after that.

Since the level change before and after the resonance signal reaches its minimum is extremely steep, it is possible to detect the minimum position of the signal level very easily, and by detecting this minimum position, the detected object This makes it possible to know the location very precisely.

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

First, a synthetic resin pipe C is continuously produced using a pipe-making machine of a synthetic resin pipe-making apparatus, and is sequentially cut into prescribed dimensions using an automatic cutting machine.

The synthetic resin pipe C of a fixed length made in this manner is placed on the workbench 51 at the base end of the pipe guide rail 61 at one end (the right end in the figure) of the object to be detected inside. Connecting member 1 with
4 are fitted, and guided by the tube guide rail 61, one by one is sent onto the pedestal 11 of the core tube manufacturing means 1.

When the synthetic resin pipe C is fed onto the pedestal 11, the cylinder 128 of the extrusion device 12 is activated and the rod 129 is extended.

Along with this, the trolley 121 moves forward toward the pedestal 11,
The extrusion plate 127 of the extrusion tool 125 comes into contact with the rear end of the synthetic resin pipe C on the pedestal 11.

Furthermore, when the rod 129 extends and the trolley 121 continues to move forward, the synthetic resin pipe C is pushed by the extrusion plate 127 and moves forward on the pedestal 11.

At this time, the synthetic resin tube C rubs against the support rollers 112, but since the wire tube C is also supported by the guide rollers 113, it moves forward smoothly.

In this way, the synthetic resin pipe C is transferred from the pedestal 11 to the feeder 1.
It is pushed towards 3. At this point, sender 1
3 has already been started, and eventually the front end of the synthetic resin pipe C reaches the delivery device 13, and when the delivery roller 131 of the delivery device 13 comes into contact with the outer peripheral surface of the front end, it starts rotating. The synthetic resin tube C starts rotating around the tube axis by the delivery rollers 131....

At the same time, the guide rollers 113 of the frame 11 supporting the rear half of the synthetic resin pipe C fall down and separate from the synthetic resin pipe C, and the rear half of the synthetic resin pipe C is supported by the support rollers 113...
It will be supported only by 12.

Thereby, the synthetic resin tube C rotates smoothly around the tube axis. Moreover, since the extrusion plate 127 that is in contact with the rear end of the synthetic resin tube C also rotates together with the synthetic resin tube C, the rotational movement of the synthetic resin tube C is not hindered in any way.

Note that the guide rollers 113 of the pedestal 11 may be laid down immediately before the synthetic resin pipe C starts rotating.

As the synthetic resin tube C is fed out by the feeder 13 in the manner described above, it is no longer necessary to continue pushing the synthetic resin tube C from behind, so the rod 129 of the cylinder 128 of the extrusion device 12 retracts. Along with this, trolley 12
1 retreats, and the extrusion plate 127 of the extrusion tool 125 returns to its initial position.

When the synthetic resin pipe C is completely separated from the pedestal 11, a stopper (not shown) at the tip of the tube guide rail 61 is released, and the next synthetic resin pipe C is sent onto the pedestal 11.

Next, the next synthetic resin pipe C is inserted into the cylinder 12 of the extrusion device 12.
When the connecting member 14 is fed forward by the rod 129 of No. 8, the end of the connecting member 14 fitted into the front end of the synthetic resin pipe C is lightly fitted into the rear end of the synthetic resin pipe C at the forward position, and these Each synthetic resin pipe C9C is integrally connected by a connecting member 14.

Here, the extrusion speed of the synthetic resin pipe C by the extrusion device 12 is set to a slightly faster speed than the delivery speed of the synthetic resin pipe C by the delivery machine 13, and thereby the connecting member 14
will connect each synthetic resin pipe C, C.

Along with this, the rotational movement of the previous synthetic resin pipe C also begins to rotate the synthetic resin pipe C on the pedestal 11 via this connecting member 14.

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 extrusion device 12 continues to push the synthetic resin pipe C rotating on the pedestal 11, both fitting portions 1 of the connecting member 14
41 and 142 are completely fitted into the ends of the respective synthetic resin pipes C and C, respectively.

After this, to prevent the fitting parts 141 and 142 of the connecting member 14 from being accidentally removed from the respective synthetic resin pipes C and C,
The extrusion device 12 continues to push the synthetic resin tube C on the pedestal 11 until its front end reaches the delivery device 3.

When the synthetic resin pipe C on the pedestal 11 reaches the delivery device 13, the extrusion device 12 returns the extrusion plate 127 to its original position.

When the synthetic resin pipe C leaves the pedestal 11, the stopper of the tube guide rail 61 is released again and the next synthetic resin pipe C is fed onto the pedestal 11.

Thereafter, in the same manner as described above, the synthetic resin pipes C are connected one after another via the connecting member 14, and thereby the core pipe is continuously manufactured.

The core tube manufactured by the core tube manufacturing means 1 as described above is sent to the raw tube manufacturing means 2.

In the raw pipe manufacturing means 2, first, as shown in FIG. It is provided so as to have approximately the same length in the left and right directions in the axial direction centering on the collar portion 145 at the central portion in the potato direction.

Next, the filler filling unit 24 of the outer layer constituent material winding part 2
As a result, the filler 241 is supplied onto the outer circumferential surface of the core tube, and the nonwoven fabric 243 is spirally wound thereon.

Furthermore, by the FRP winding unit 25, FRP253
is wound spirally.

Since these FRP253 etc. move forward while the core tube is always rotating at a constant speed, they are wound spirally around the core tube at a constant pitch from beginning to end, and on the outer peripheral surface of the core tube,
The outer layer constituent material layer 20 having a constant thickness is continuously formed.

In this way, after the outer layer constituent material layer 20 is formed, the core tube advances while rotating in the curing furnace 26, during which the outer layer constituent material layer 20 is cured, and the resin composite original tube E
becomes.

The resin composite raw tube E produced as described above is taken up while being rotated by the raw tube trading means 3 and sent to the next outer layer cutting means 4.

The outer layer cutting means 4 waits at a predetermined position for the resin composite raw tube E sent out from the raw tube collecting means 3, and at the same time as the object to be detected 8 of the connecting member 14 is detected by the detector 41, It starts moving in the same direction as the traveling direction of the original tube E. At this time, the saw blades 46, 46 are positioned at a predetermined position with respect to the resin composite tube E, that is, at a position corresponding to both ends of the release film 211 present at the connection site.

Then, while moving at the same speed as the traveling speed of the resin composite raw tube E, the outer layer cutting means 4 cuts the outer layer constituting material layer 20 at the predetermined portion of the raw resin tube E using the saw blades 46 and 46 in the above-positioned state. Cut until the release film 211 is reached.

That is, as shown in FIG. 10, the outer layer constituting material layer 20 at both ends of the release film 211 at the connecting portion of the master pipe E is cut with a saw blade 46.46.

After completing this incision, the outer layer incision means 4 returns to its original position and prepares for the next incision.

After being incised as described above, each resin composite master tube E is removed by removing the connecting member 14 at the connecting part and removing the outer layer constituting material layer 20 on the outer periphery together with the release film 211. The resin composite pipe F is made into a single unit, and the state shown in FIG. 13 is obtained. In the figure, f and f are both ends (the bare surface of the thermoplastic resin pipe) from which the outer layer constituent material layer 20 has been peeled off.

In this manner, a resin composite tube of a fixed length is continuously manufactured in which the thickness of the outer layer constituting material layer 20 is uniform over the entire length except for the peeled portions at both ends.

In the above embodiment, the antenna coil 8 is attached to the detected object 8.
1 and a piezoelectric vibrating body, a general LC resonant circuit may be used instead. Moreover, a metal, a magnet, or the like may be used for the object to be detected 8, and in that case, a magnetic field line detector or the like may be used as the metal detector for the detector 41.

(Effects of the Invention) As described above, according to the present invention, since the detection accuracy of the tube end position is high, a regular length resin composite tube with tube end peeling can be obtained with less variation in tube end peeling dimension.

Moreover, compared to conventional manual work, the tube end peeling work can be performed automatically and simplified, and continuous production can be performed, dramatically improving productivity.

[Brief explanation of drawings]

1 to 13 show an embodiment of the method for manufacturing a resin composite pipe according to the present invention, FIG. 1 is a schematic diagram showing the manufacturing process and manufacturing device, and FIG. 2 is an extrusion device of the core tube manufacturing means. FIG. 3 is a right side view of the same, FIG. 4 is a schematic front view showing the structure of the delivery machine of the core tube manufacturing means, FIG. 5 is a left side view of the same, and FIG. FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, FIG. 8 is a perspective view showing another example of the connecting member, and FIG. 9 is a sectional view taken along the line ■-■ in FIG. A cross-sectional view taken along the line IX-IX, FIG. 10 is a cross-sectional view showing the connecting portion of the synthetic resin pipe in the resin composite original tube and the position of the saw blade of the outer layer cutting means, and FIG. 11 is the positional relationship between the detected object and the detecting means. FIG. 12 is a waveform diagram to explain how the reception level of the resonance signal in the detector changes as the positional relationship between the object to be detected and the detection means changes.
The figure is a front view showing a resin composite pipe manufactured by the method of the present invention, and FIG. 14 is a front view for explaining a conventional method for manufacturing a resin composite pipe. 1... Core tube manufacturing means 11... Frame 12... Extrusion device 13...
・Sending machine 14...Connection member 141.142・
... Inset part 143, 144... Chamfered part 145... Collar part 2... Raw tube manufacturing means 21... Release film first winding part 22... Outer layer constituent material winding part 26. ...Curing furnace 3...Original tube take-up means 4...Tube skin cutting means 41...Detector 1...Working table l...Tube guide rail 8...Detected object 81... Antenna coil C...Synthetic resin tube of fixed length D...Core tube E...Resin composite original tube F...Resin composite tube f, f...9148 section 46...Saw blade

Claims (1)

[Claims] 1) A synthetic resin pipe of a fixed length is advanced along the pipe axis while being rotated around the pipe axis, and a synthetic resin pipe of the same fixed length is attached to the rear end of the synthetic resin pipe. is connected to the connecting portion of both tubes and the position of the detected object through a connecting member that has an object to be detected inside and transmits the rotational movement and forward motion of the first synthetic resin tube to the subsequent synthetic resin tube. concatenate so that they match,
Thereafter, synthetic resin pipes of fixed length are sequentially connected in the same manner, forming a core pipe in which multiple synthetic pipes are connected and integrated, and moving forward along the pipe axis while rotating around the pipe axis. After sequentially covering each connecting portion of the synthetic resin pipe of the core pipe with a release film of a predetermined width, forming a resin composite master pipe by winding and laminating an outer layer constituent material around the outer peripheral surface of the core pipe; After the outer layer constituent material has hardened, a depth that reaches the release film is placed at a predetermined distance in both directions along the tube axis from the position of the object to be detected inside the resin composite tube as a reference. making a slit, and then sequentially separating a fixed-length resin composite tube with bare surfaces of the synthetic resin tube exposed at both ends and the connecting member from the resin composite original tube. Method for manufacturing composite pipes.