JP2020131524A - Resin pipe heating apparatus - Google Patents

Abstract

To provide a resin pipe heating apparatus which is compact and easy to carry, and which can efficiently heat a bent processing part of a plurality of types of resin pipes having different outer diameters.SOLUTION: A heating apparatus 10 for a resin pipe includes a main body device 1 and a lid device 3 that is openably and closably connected to an upper end of the main body device to accommodate and heat a resin pipe 2. The main body device includes: a lower frame body 11 in which a lower heating space K1 for heating a lower part of a bent processing part 21 of a plurality of types of resin pipes having different outer diameters is formed; a resin pipe rotating part 4 mounted on the lower frame body to rotate the resin pipe in a circumferential direction; and an insulation material 12 filled in the lower frame body. The lid device includes: an upper frame 31 in which an upper heating space K2 for heating an upper part of the bent processing part is formed; a planar heating element 5 mounted on an inner wall surface 311 of the upper frame; and an insulation material 32 filled in the upper frame. The main body device and the lid device are closed to form an integral heating space KK, and the resin pipe is rotated in the circumferential direction to heat the bent processing part in the heating space whose temperature is raised by the planar heating element 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resin tube heating device, and more particularly to a resin tube heating device that efficiently heats bent portions of a plurality of types of resin tubes having different outer diameters.

For example, when a resin pipe used for a gas pipe or the like is buried in the ground, a predetermined portion of the resin pipe may be bent and buried at a construction site. In that case, a resin tube heating device that can quickly heat the bent portion of the resin tube to a temperature near the melting point is required. The resin tube heating device is disclosed in, for example, Patent Documents 1 and 2.

As shown in FIGS. 7 and 8, the resin tube heating device 100 disclosed in Patent Document 1 holds and heats the resin tube 101 in two radial directions with respect to the axial direction X of the resin tube 101. It is possible to form a heating space KV having a circular cross section by bringing the divided first device main body 102 and the second device main body 103 into contact with each other, and the heat insulating layer 104 provided on each of the first device main body 102 and the second device main body 103. In addition, a heating element 105 whose temperature can be adjusted is provided. Further, a metal split cylinder 106 having a substantially half-cylindrical shape is provided on the inner peripheral surfaces of the first device main body 102 and the second device main body 103, respectively, and the heating element 105 is formed on the outer circumference of the split cylinder 106. It is placed close to the surface. Further, the metal split cylinder 106 is made of copper, and the thermocouple 107 is contact-arranged on the outer peripheral surface of the split cylinder 106.

In the resin tube heating device 100, when the resin tube 101 is heated, a metal split cylinder 106 having a substantially half-cylindrical shape provided in each of the first device main body 102 and the second device main body 103 is hit. The resin tube 101 is brought into contact with the resin tube 101 from the outside. Therefore, since the heat of the heating element 105 can be directly transferred to the resin tube 101 via the split cylinder 106, there is an advantage that the resin tube 101 can be efficiently heated.

However, the resin tube heating device 100 has a structure in which the metal split cylinder 106 is brought into contact with the resin tube 101 to hold the resin tube 101 from the outside when the resin tube 101 is heated. Although it can be applied to a resin tube 101 having an outer diameter that can be held by the body 106, there is a problem that it cannot be applied to a resin tube having an outer diameter different from that.

On the other hand, as shown in FIG. 9, the resin tube heating device 200 disclosed in Patent Document 2 includes a heater 202 that is vertically movablely attached to the frame body 205 and can heat the resin tube 201 from above. It is provided with a pipe rotating roller 203 that is paired with the heater 202 and supports the resin pipe 201 from below while rotating, and an automatic discharger 204 that lifts the resin pipe 201 after heating and discharges the resin pipe 201 to the side of the frame 205.

In the resin tube heating device 200, since the heater 202 that can move up and down with respect to the frame body 205 can heat the resin tube 201 from above, it can be heated by adjusting the distance between the resin tube 201 and the heater 202, and has an outer diameter. There was an advantage that it could be applied to different resin tubes 201. Further, since the tube rotating roller 203 that is paired with the heater 202 and supports the resin tube 201 from below while rotating is provided, the heat of the heater 202 from above is dispersed over the entire circumference of the resin tube 201 to disperse the resin tube 201. There was also an advantage that 201 could be heated uniformly.

Japanese Unexamined Patent Publication No. 2001-41350 Japanese Unexamined Patent Publication No. 10-180770

However, the resin tube heating device 200 of Patent Document 2 has a structure in which the resin tube 201 is discharged to the side of the frame 205 (the direction orthogonal to the axial direction of the resin tube 201 (direction of arrow Y)) after heating. Therefore, the heat of the heater 202 escapes to the discharge path side of the resin tube 201, and there is a problem that the resin tube 201 cannot be heated efficiently. Further, since the resin pipe 201 is discharged in the direction orthogonal to the axial direction (direction of the arrow Y), the width dimension of the discharge path 206 needs to be larger than the total length of the resin pipe 201, and the heating device 200 is used. It could not be designed compactly, and there was a problem in portability to the construction site.

The present invention has been made to solve the above problems, and an object of the present invention is to efficiently heat a bent portion of a plurality of types of resin pipes having different outer diameters, which are compact and easy to carry. It is to provide a heating device for a resin tube capable of producing.

In order to solve the above problems, the resin tube heating device of the present invention has the following configuration.
(1) A resin tube heating device including a main body device and a lid device that is openably and closably connected to the upper end of the main body device to accommodate and heat the resin tube.
The main body device includes a lower frame body in which a lower heating space is formed for accommodating and heating the lower parts of a plurality of types of bent portions of the resin pipe having different outer diameters, and the lower heating space of the lower frame body. A resin pipe rotating portion that is mounted on the bottom surface side of the inner wall surface of the partition and rotates the resin pipe in the circumferential direction while supporting the lower portion of the bending portion so as to be vertically movable, and an outer wall surface of the lower frame body. Provided with a heat insulating material filled between the inner wall surface and the inner wall surface.
The lid device has an upper frame body in which an upper heating space for accommodating and heating the upper part of the bent portion is formed, and a planar shape mounted on an inner wall surface partitioning the upper heating space of the upper frame body. A heating element and a heat insulating material filled between the outer wall surface and the inner wall surface of the upper frame are provided.
In the heating space where the lower heating space and the upper heating space form an integral heating space with the main body device and the lid device closed, and the temperature is raised by the radiant heat of the planar heating element. The bending portion is heated while the resin pipe rotating portion rotates the resin pipe in the circumferential direction. Here, the "bending portion" means a part of the resin pipe to be bent after heating.

In the present invention, the main body apparatus includes a lower frame body in which a lower heating space is formed for accommodating and heating the lower parts of bent portions of a plurality of types of resin tubes having different outer diameters, and lower heating of the lower frame body. A resin pipe rotating part that is mounted on the bottom surface side of the inner wall surface that partitions the space and rotates the resin pipe in the circumferential direction while supporting the lower part of the bending part that can move up and down, and the outer wall surface and the inner surface of the lower frame body. The lid device is provided with a heat insulating material filled between the wall surface and the upper frame, and the upper frame is formed with an upper heating space for accommodating and heating the upper part of the bent portion, and the upper heating of the upper frame. It is provided with a planar heating element mounted on the inner wall surface that partitions the space and a heat insulating material filled between the outer wall surface and the inner wall surface of the upper frame, and the main body device and the lid device are closed. Then, the lower heating space and the upper heating space form an integral heating space, and the resin tube rotating portion rotates the resin tube in the circumferential direction in the heating space whose temperature is raised by the radiant heat of the planar heating element. However, since the bent portion is heated, the bent portion of a plurality of types of resin tubes having different outer diameters is heated substantially uniformly while rotating in the circumferential direction in the heating space where the surface heating element raises the temperature. be able to. Further, the bent portion of the resin tube is housed in an integral heating space formed by the lower heating space and the upper heating space, and is heated by the temperature rise in the heating space. It can be made compact enough to accommodate the bent portion of the resin tube. Further, since the heat in the heating space is restricted from being dissipated to the outside by the heat insulating material filled in the upper frame body and the lower frame body, the bent portion of the resin pipe can be efficiently heated.

Therefore, according to the present invention, it is possible to provide a resin tube heating device that is compact, easy to transport, and can efficiently heat bent portions of a plurality of types of resin tubes having different outer diameters.

(2) In the resin tube heating device described in (1),
Another planar heating element is mounted on the side surface side of the inner wall surface of the lower frame body, and the temperature in the lower heating space is raised by the radiant heat of the other planar heating element.

In the present invention, another planar heating element is mounted on the side surface side of the inner wall surface of the lower frame body, and the temperature in the lower heating space is raised by the radiant heat of the other planar heating element. The radiant heat of the planar heating element of the device and the radiant heat of the other planar heating elements of the main unit make the temperature distribution of the heating space in which the bending portion is housed more uniform, and the bending portion can be bent more evenly and quickly. Can be heated. Further, since the radiant heat of the other planar heating element raises the temperature in the lower heating space, the temperature of the resin pipe rotating portion can be raised to the same level as the temperature in the lower heating space, and the bending portion It is possible to prevent the temperature from fluctuating due to contact between the bent portion and the resin pipe rotating portion.

(3) In the resin tube heating device according to (1) or (2).
The inner wall surface of the upper frame body is characterized in that it is formed on an arcuate wall surface centered on the axis of the bent portion.

In the present invention, since the inner wall surface of the upper frame body is formed as an arc-shaped wall surface centered on the axis of the bent portion, the gap between the planar heating element of the upper frame body and the bent portion is substantially eliminated. It becomes uniform, and the radiant heat of the planar heating element can be transmitted to the bending portion more uniformly, and the temperature variation of the bending portion can be further reduced.

(4) In the resin tube heating device according to any one of (1) to (3).
The planar heating element is characterized in that it is divided into a plurality of rows in the axial direction of the bending portion.

In the present invention, since the planar heating element is divided into a plurality of rows in the axial direction of the bending portion, the temperature increase amount can be adjusted according to the magnitude of the molding amount in the bending portion. That is, the radiant heat amount of the planar heating element corresponding to the bending center region can be increased so that the bending center region having a large bending molding amount in the bending portion can easily expand and contract. On the other hand, in the bending portion, the radiant heat amount of the planar heating element corresponding to the bending peripheral region can be further reduced so that the bending peripheral region away from the bending center where the bending forming amount is small is difficult to expand and contract. it can. By dividing the planar heating element into a plurality of rows in the axial direction of the bending portion in this way, the amount of radiant heat of the planar heating element in the bending center region and the bending peripheral region according to the magnitude of the bending molding amount. Can be adjusted to more accurately bend the resin tube after heating. Further, by adjusting the amount of radiant heat of the planar heating element according to the magnitude of the bending molding amount, the power consumption of the planar heating element can be saved.

(5) In the resin tube heating device according to any one of (1) to (4).
The planar heating element is characterized in that a carbon graphite layer is coated on a mixed paper of carbon fibers and pulp fibers.

In the present invention, since the planar heating element is coated with a carbon graphite layer on a mixed draft sheet of carbon fibers and pulp fibers, the temperature is caused by the radiant heat radiated from the carbon fibers generated by resistance and the resistance heat generated by the carbon fibers. By the synergistic effect with the radiant heat radiated from the raised carbon graphite layer, the temperature of the heating space can be raised more efficiently, and the bent portion can be heated efficiently. In addition, the far-infrared rays emitted from the carbon fibers and carbon graphite can heat the bent portion more uniformly to the inside.

(6) In the resin tube heating device according to any one of (1) to (5).
The planar heating element is composed of a plurality of band-shaped heating elements, and electrodes formed at both ends in the longitudinal direction of the band-shaped heating element are connected in series in accordance with a power supply voltage. ..

In the present invention, the planar heating element is composed of a plurality of band-shaped heating elements, and the electrodes formed at both ends of the band-shaped heating element in the longitudinal direction are connected in series corresponding to the power supply voltage. By setting the connection quantity of the band-shaped heating element so as to correspond to the voltage value of the power supply, the control unit of this heating device can be simplified without the need for a voltage adjustment controller or the like. For example, if the rated voltage of the band-shaped heating element is 50 V, the power supply voltage of 200 V can be used as it is by connecting four band-shaped heating elements in series. If it is a 200V three-phase AC power supply, a band-shaped heating element can be connected in series for each phase.

According to the present invention, it is possible to provide a resin tube heating device that is compact, easy to transport, and can efficiently heat bent portions of a plurality of types of resin tubes having different outer diameters.

It is the schematic sectional drawing in the heating device of the resin tube which concerns on this embodiment. It is sectional drawing of AA shown in FIG. It is a partial plan view of the planar heating element shown in FIG. It is a schematic circuit diagram which connects a planar heating element shown in FIG. 3 and a three-phase AC power source. It is the schematic sectional drawing of the planar heating element shown in FIG. It is a schematic perspective view of the heat insulating material shown in FIG. It is the schematic sectional drawing in the heating apparatus of the resin tube described in Patent Document 1. FIG. 7 is a perspective view of the resin tube heating device shown in FIG. 7 in a state in which the first device main body and the second device main body are opened. It is the schematic sectional drawing in the heating apparatus of the resin tube described in Patent Document 2.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. Here, the structure of the resin tube heating device and the operation method thereof according to the present embodiment will be described in detail with reference to the drawings.

<Structure of this heating device and its operation method>
The structure of the resin tube heating device and the operation method thereof according to the present embodiment will be described with reference to FIGS. 1 to 6. FIG. 1 shows a schematic cross-sectional view of the resin tube heating device according to the present embodiment. FIG. 2 shows a cross-sectional view taken along the line AA shown in FIG. FIG. 3 shows a partial plan view of the planar heating element shown in FIG. FIG. 4 shows a schematic circuit diagram for connecting the planar heating element shown in FIG. 3 and the three-phase AC power supply. FIG. 5 shows a schematic cross-sectional view of the planar heating element shown in FIG. FIG. 6 shows a schematic perspective view of the heat insulating material shown in FIG.

As shown in FIGS. 1 and 2, the resin tube heating device 10 according to the present embodiment is a lid that is openably and closably connected to the main body device 1 and the upper end of the main body device 1 to accommodate and heat the resin tube 2. It is a heating device for a resin tube provided with a body device 3. The resin pipe 2 corresponds to a vinyl chloride pipe used for a gas pipe, a water pipe, or the like. The lid device 3 is opened and closed in the vertical direction via a hinge 33 attached to the upper end of the main body device 1, and is closed and fixed by a stopper 34 attached at a position facing the hinge 33 of the main body device 1. .. The resin tube 2 is inserted into and taken out from the main body device 1 from above by opening the lid device 3. Further, a rotatable caster 13 is attached to the lower end of the main body device 1 to improve portability so that on-site construction can be easily performed.

Further, the main body device 1 includes a lower frame body 11 in which a lower heating space K1 for accommodating and heating the lower portion 211 of a bending portion 21 of a plurality of types of resin tubes 2 having different outer diameters is formed, and the lower frame body. The lower heating space K1 of 11 is mounted on the bottom surface 112 side of the inner wall surfaces 111 and 112 that partition the lower heating space K1 in a substantially U shape, and while supporting the lower portion 211 of the bending portion 21 so as to be vertically movable, the resin tube 2 is rotated in the circumferential direction (arrow). A resin pipe rotating portion 4 that rotates in the direction of Q) and a heat insulating material 12 that is filled between the outer wall surface 113 and the inner wall surfaces 111 and 112 of the lower frame body 11 are provided. Here, the "bending processing portion 21" means a part of the resin tube 2 to be bent after heating. Since the resin pipe rotating portion 4 horizontally supports the resin pipe 2 before bending, a plurality of resin pipe rotating portions 4 are provided along the axial direction (direction of arrow J) of the resin pipe 2 and the direction orthogonal to the axial direction. , And fixed to the bottom surface 112 via a mounting base 45.

Further, the resin pipe rotating portion 4 includes a driving device 41 that expands and contracts the rod 42 in the vertical direction, a roller body 43 that is connected to the tip portion of the rod 42 and abuts on the bending portion 21, and a roller body 43 in the circumferential direction. It is provided with a rotating device 44 for rotating. The axial length of the roller body 43 is preferably set to a length that does not cause the heated bending portion 21 to hang down. Further, since the drive device 41 corresponds to the resin pipes 2 having different outer diameters, an electric cylinder or the like in which the amount of expansion and contraction of the rod 42 can be arbitrarily set is preferable. Further, the rotating device 44 is preferably an electric motor or the like capable of setting a rotation speed suitable for the outer diameter of the resin tube 2.

Further, the lid device 3 has an inner wall surface that partitions the upper frame body 31 in which the upper heating space K2 for accommodating and heating the upper portion 212 of the bending portion 21 is formed and the upper heating space K2 of the upper frame body 31. A planar heating element 5 mounted on the 311 and a heat insulating material 32 filled between the outer wall surface 312 and the inner wall surface 311 of the upper frame body 31 are provided. Then, with the main body device 1 and the lid device 3 closed, the lower heating space K1 and the upper heating space K2 form an integrated heating space KK, and the temperature is raised by the radiant heat of the planar heating element 5. In the space KK, the resin pipe rotating portion 4 heats the bending portion 21 while rotating the resin pipe 2 in the circumferential direction (direction of arrow Q).

Further, as shown in FIGS. 1 and 6, the heat insulating material 32 of the lid device 3 and the heat insulating material 12 of the main body device 1 are formed as rectangular plate-shaped heat insulating block bodies 32T and 12T, respectively, and each heat insulating block body 32T. , 12T are laminated in the plate thickness direction between the outer wall surfaces 312 and 113 and the inner wall surfaces 311 and 111, and are arranged so that the end faces in the longitudinal direction are zigzag. Further, in each of the heat insulating block bodies 32T and 12T, for example, the outer peripheral surfaces of the carbon fiber laminates 32T3 and 12T3 in which the short carbon fibers 32T1 and 12T1 are connected by granular ceramics 32T2 and 12T2 are mainly composed of alumina and the like. It is formed by coating with heat-resistant coating layers 32T4 and 12T4. In this case, the porosity of the carbon fiber laminates 32T3 and 12T3 is preferably about 80 to 90%.

Further, as shown in FIGS. 1 and 2, another planar heating element 6 is mounted on the side surface 111S side of the inner wall surfaces 111 and 112 of the lower frame body 11, and the radiant heat of the other planar heating element 6 is attached. It is preferable to raise the temperature in the lower heating space K1. In this case, the radiant heat of the planar heating element 5 of the lid device 3 and the radiant heat of the other planar heating element 6 of the main body device 1 make the temperature distribution of the heating space KK in which the bending portion 21 is housed more uniform. Therefore, the bending portion 21 can be heated more evenly and quickly. Further, the radiant heat of the other planar heating element 6 raises the temperature in the lower heating space K1, so that the temperature of the roller body 43 of the resin tube rotating portion 4 also rises to the same extent as the temperature in the lower heating space K1. It is possible to prevent the temperature of the bending portion 21 from fluctuating due to contact between the lower portion 211 of the bending portion 21 and the roller body 43 of the resin pipe rotating portion 4.

Further, the inner wall surface 311 of the upper frame body 31 is preferably formed on the arcuate wall surface 311S centered on the axial center JT of the bending portion 21. In this case, the gap between the planar heating element 5 of the upper frame body 31 and the bending portion 21 becomes substantially uniform. Therefore, the radiant heat of the planar heating element 5 can be more uniformly transmitted to the bending processing portion 21 through the upper heating space K2 formed by a substantially uniform gap, and the temperature variation of the bending processing portion 21 can be further reduced.

Further, as shown in FIGS. 2 and 3, the planar heating element 5 mounted on the upper frame body 31 is divided into a plurality of rows in the axial direction (direction of arrow J) of the bending portion 21. preferable. Here, the planar heating element 5 (51, 52, 53, 54) is divided into four equal parts in the axial direction (direction of arrow J), and constitutes the heater groups H1, H2, H3, and H4, respectively. .. A planar heating element 51 constituting the first row heater group H1 and a planar heating element 54 constituting the fourth row heater group H4 are located near the edge of the upper frame 31 in the axial direction (direction of arrow J). And are arranged, and at a position closer to the center in the axial direction (direction of arrow J) of the upper frame body 31, a planar heating element 52 constituting the second row heater group H2 and a surface forming the third row heater group H3. A heating element 53 is arranged. The other planar heating elements 6 (61, 62, 63, 64) mounted on the lower frame 11 also have the axial direction of the bending portion 21 (similar to the planar heating element 5 of the upper frame 31). It is divided into a plurality of rows (heater groups divided into four equal parts) in the direction of the arrow J), and the heater groups H1, H2, H3, H4 of the planar heating elements 5 (51, 52, 53, 54) of the upper frame body 31. Are arranged in the same row as.

Further, as shown in FIGS. 1 to 5, the planar heating elements 5 and 6 are composed of a plurality of band-shaped heating elements 5S and 6S, and electrodes formed at both ends of the band-shaped heating elements 5S and 6S in the longitudinal direction. The 5S3s are connected in series corresponding to the power supply voltage. In this case, by setting the connection quantity of the band-shaped heating elements 5S and 6S so as to correspond to the voltage value of the power supply 8, the controller for voltage adjustment and the like are not required, and the control unit 7 of the heating device 10 is simplified. can do. For example, if the rated voltage of the band-shaped heating element 5S is 50 V, the power supply voltage of 200 V can be used as it is by connecting four band-shaped heating elements 5S in series. If the power supply 8 is a 200V three-phase AC power supply, the band-shaped heating element 5S can be connected in series for each phase (A phase, B phase, C phase). The longitudinal direction of the band-shaped heating elements 5S and 6S coincides with the axial direction of the bending portion 21 (direction of arrow J).

Further, the planar heating element 5 is composed of a plurality of strip-shaped heating elements 5S in which a mixed paper sheet 5S1 of carbon fibers and pulp fibers is coated with a carbon graphite layer 5S2, and is formed at both ends of the strip-shaped heating element 5S in the longitudinal direction. The electrodes 5S3 are connected in series corresponding to the power supply voltage via the connecting lead wire 5S4. The heating temperature at the rated voltage of the band-shaped heating element 5S is preferably about 300 to 400 ° C. The mixing ratio of the carbon fiber and the pulp fiber in the mixed paper sheet 5S1 is, for example, about 30 to 40% by weight of the carbon fiber and about 60 to 70% of the pulp fiber. Further, the carbon graphite layer 5S2 is, for example, a film having a thickness of about several tens of μm in which carbon particles having a particle size of about 0.2 to 0.5 μm are dispersed in a urethane resin. The other planar heating element 6 is also composed of a plurality of strip-shaped heating elements 6S in which a mixed draft sheet of carbon fibers and pulp fibers is coated with a carbon graphite layer, and is formed at both ends of the strip-shaped heating element 6S in the longitudinal direction. The electrodes are connected in series corresponding to the power supply voltage via the connecting lead wire.

Further, the heating device 10 has a control unit 7 which is connected to the power supply 8 and controls the operation of the resin tube rotating unit 4 and the planar heating elements 5 and 6, and an operation unit which transmits operation information to the control unit 7. 9 and a thermometer (not shown) are provided. The thermometer measures the temperature near the center and the temperature near the edge in the axial direction (direction of arrow J) in the heating space KK. For example, when the outer diameter, wall thickness, material, etc. of the resin tube 2 to be heated are input in the operation unit 9, the energization time and resin according to the heater groups H1, H2, H3, and H4 of the planar heating elements 5 and 6 are input. The control unit 7 calculates the optimum values such as the extension amount of each rod 42 of the pipe rotation unit 4 and the rotation speed of the roller body 43, and the resin pipe rotation unit 4 and the planar heating elements 5 and 6 are set according to the optimum values. Activate. Each optimum value is stored in the control unit 7.

Further, during the energizing time of the planar heating elements 5 and 6, the heater group H2 corresponding to the bending center region R1 is easily expanded and contracted in the bending center region R1 having a large bending molding amount in the bending portion 21. , The energization time of the planar heating elements 52, 53, 62, 63 of H3 can be lengthened to increase the amount of radiant heat. On the other hand, among the bending portions 21, the bending peripheral region R2 away from the bending center where the bending forming amount is small is a planar heating element of the heater groups H1 and H4 corresponding to the bending peripheral region R2 so as to be difficult to expand and contract. The energizing time of 51, 54, 61, 64 can be shortened to further reduce the amount of radiant heat. The energizing time of the planar heating elements 5 and 6 can be corrected based on the temperature measurement value of the heating space KK.

<Action effect>
As described in detail above, according to the resin tube heating device 10 according to the present embodiment, the main body device 1 accommodates the lower portion 211 of the bending portion 21 of a plurality of types of resin tubes 2 having different outer diameters. The lower frame 11 on which the lower heating space K1 is formed and the lower heating space K1 of the lower frame 11 are mounted on the bottom surface 112 side of the inner wall surfaces 111 and 112 that partition the lower frame 11 in a substantially U shape, and can move up and down. The resin pipe rotating portion 4 that rotates the resin pipe 2 in the circumferential direction (direction of arrow Q) while supporting the lower portion 211 of the bending portion 21, and the outer wall surface 113 and the inner wall surface 111 of the lower frame body 11. An upper frame 31 having a heat insulating material 12 filled between the 112 and the lid device 3 and having an upper heating space K2 for accommodating and heating the upper 212 of the bending portion 21 and the lid device 3 A planar heating element 5 mounted on the inner wall surface 311 that partitions the upper heating space K2 of the upper frame body 31 and a heat insulating material 32 filled between the outer wall surface 312 and the inner wall surface 311 of the upper frame body 31 are provided. Further, with the main body device 1 and the lid device 3 closed, the lower heating space K1 and the upper heating space K2 form an integrated heating space KK, and the temperature is raised by the radiant heat of the planar heating element 5. In the heating space KK, the resin pipe rotating portion 4 heats the bending portion 21 while rotating the resin pipe 2 in the circumferential direction (direction of arrow Q), so that a plurality of types of resin pipes 2 having different outer diameters 2 are heated. The bent portion 21 of the above can be heated substantially uniformly while rotating in the circumferential direction (direction of arrow Q) in the heating space KK where the surface heating element 5 has raised the temperature. Further, the bent portion 21 of the resin tube 2 is housed in the integrated heating space KK formed by the lower heating space K1 and the upper heating space K2, and is heated by the temperature in the heating space KK rising. The heating device 10 can be made compact enough to accommodate the bent portion 21 of the resin tube 2. Further, since the heat in the heating space KK is restricted from being dissipated to the outside by the heat insulating materials 12 and 32 filled in the upper frame body 31 and the lower frame body 11, the bent portion 21 of the resin tube 2 is restricted. It can be heated efficiently.

Therefore, according to the present embodiment, there is provided a resin tube heating device 10 that is compact and easy to carry, and can efficiently heat the bent portion 21 of a plurality of types of resin tubes 2 having different outer diameters. be able to.

Further, according to the present embodiment, another planar heating element 6 is mounted on the side surface 111S side of the inner wall surface 111 and 112 of the lower frame body 11, and the lower heating element is heated by the radiant heat of the other planar heating element 6. Since the temperature in the space K1 is raised, the radiant heat of the planar heating element 5 of the lid device 3 and the radiant heat of the other planar heating element 6 of the main body device 1 are combined with the heating space KK in which the bending portion 21 is housed. The temperature distribution of the above can be made more uniform, and the bending portion 21 can be heated more evenly and quickly. Further, since the radiant heat of the other planar heating element 6 raises the temperature in the lower heating space K1, the temperature of the resin pipe rotating portion 4 can also be raised to the same extent as the temperature in the lower heating space K1. It is possible to prevent the temperature of the bending portion 21 from fluctuating due to contact between the bending portion 21 and the resin pipe rotating portion 4.

According to the present embodiment, since the inner wall surface 311 of the upper frame body 31 is formed on the arc-shaped wall surface 311S centered on the axial center JT of the bending portion 21, the planar heating element 5 of the upper frame body 31 The gap between the and the bending portion 21 becomes substantially uniform, the radiant heat of the planar heating element 5 can be transmitted to the bending portion 21 more uniformly, and the temperature variation of the bending portion 21 can be further reduced.

Further, according to the present embodiment, since the planar heating elements 5 and 6 are divided into a plurality of rows in the axial direction of the bending portion 21 (direction of arrow J), the amount of molding in the bending portion 21 is large. The amount of temperature rise can be adjusted accordingly. That is, the bending center region R1 having a large bending molding amount in the bending portion 21 has the amount of radiant heat of the planar heating elements 52, 53, 62, 63 corresponding to the bending center region R1 so as to easily expand and contract. You can make more. On the other hand, among the bending portions 21, the bending peripheral regions R2 away from the bending center where the bending forming amount is small are the planar heating elements 51, 54, 61 corresponding to the bending peripheral regions R2 so as to be difficult to expand and contract. The amount of radiant heat of 64 can be reduced. In this way, by dividing the planar heating elements 5 and 6 into a plurality of rows in the axial direction of the bending portion 21 (direction of arrow J), the bending molding amount is formed in the bending center region R1 and the bending peripheral region R2. The amount of radiant heat of the planar heating elements 5 and 6 can be adjusted according to the magnitude of the heating element, and the resin tube 2 can be bent more accurately after heating. Further, the power consumption of the planar heating elements 5 and 6 can be saved by adjusting the amount of radiant heat of the planar heating elements 5 and 6 according to the magnitude of the bending molding amount.

Further, according to the present embodiment, in the planar heating elements 5 and 6, since the carbon graphite layer is coated on the mixed paper of the carbon fiber and the pulp fiber, the radiant heat radiated from the carbon fiber generated by the resistance is generated. By the synergistic effect with the radiant heat radiated from the carbon graphite layer whose temperature has risen due to the resistance heat generation of the carbon fibers, the temperature of the heating space KK can be raised more efficiently, and the bent portion 21 can be efficiently heated. .. In addition, the bent portion 21 can be heated more uniformly to the inside by the far infrared rays radiated from the carbon fibers and carbon graphite.

Further, according to the present embodiment, the planar heating elements 5 and 6 are composed of a plurality of band-shaped heating elements 5S and 6S, and electrodes formed at both ends of the band-shaped heating elements 5S and 6S in the longitudinal direction are used as a power source. Since they are connected in series corresponding to the voltage, by setting the connection quantity of the band-shaped heating elements 5S and 6S so as to correspond to the voltage value of the power supply 8, a controller for voltage adjustment or the like is not required. The control unit 7 of the heating device 10 can be simplified. For example, if the rated voltage of the band-shaped heating elements 5S and 6S is 50 V, the power supply voltage of 200 V can be used as it is by connecting four band-shaped heating elements 5S and 6S in series. If the power supply 8 is a 200V three-phase AC power supply, the band-shaped heating elements 5S and 6S can be connected in series for each phase.

INDUSTRIAL APPLICABILITY The present invention can be used as a resin tube heating device that efficiently heats bent portions of a plurality of types of resin tubes having different outer diameters.

1 Main unit 2 Resin tube 3 Lid device 4 Resin tube rotating part 5, 6 Plane heating element 5S, 6S Band-shaped heating element 5S1 Mixed paper sheet 5S2 Carbon graphite layer 5S3 Electrode 10 Resin tube heating device 11 Lower frame body 12, 32 Insulation 21 Bending part 31 Upper frame body 51, 52, 53, 54 Surface heating element 61, 62, 63, 64 Surface heating element 111, 112 Inner wall 111S Side surface 112 Bottom surface 113 Outer wall surface 211 Lower part 212 Upper part 311 Inner wall surface 311S Arc-shaped wall surface 312 Outer wall surface K1 Lower heating space K2 Upper heating space KK Heating space J Axial direction JT Axial center

Claims (6)

A resin tube heating device including a main body device and a lid device that is openably and closably connected to the upper end of the main body device to accommodate and heat the resin tube.
The main body device includes a lower frame body in which a lower heating space is formed for accommodating and heating the lower parts of a plurality of types of bent portions of the resin pipe having different outer diameters, and the lower heating space of the lower frame body. A resin pipe rotating portion that is mounted on the bottom surface side of the inner wall surface of the partition and rotates the resin pipe in the circumferential direction while supporting the lower portion of the bending portion so as to be vertically movable, and an outer wall surface of the lower frame body. Provided with a heat insulating material filled between the inner wall surface and the inner wall surface.
The lid device has an upper frame body in which an upper heating space for accommodating and heating the upper part of the bent portion is formed, and a planar shape mounted on an inner wall surface partitioning the upper heating space of the upper frame body. A heating element and a heat insulating material filled between the outer wall surface and the inner wall surface of the upper frame are provided.
In the heating space where the lower heating space and the upper heating space form an integral heating space with the main body device and the lid device closed, and the temperature is raised by the radiant heat of the planar heating element. A resin pipe heating device, wherein the resin pipe rotating portion heats the bent portion while rotating the resin pipe in the circumferential direction. In the resin tube heating device according to claim 1,
A resin tube characterized in that another planar heating element is mounted on the side surface side of the inner wall surface of the lower frame body, and the temperature in the lower heating space is raised by the radiant heat of the other planar heating element. Heating device. In the resin tube heating device according to claim 1 or 2.
A resin tube heating device characterized in that the inner wall surface of the upper frame body is formed on an arcuate wall surface centered on the axis of the bent portion. In the resin tube heating device according to any one of claims 1 to 3.
A resin tube heating device, wherein the planar heating element is divided into a plurality of rows in the axial direction of the bending portion. In the resin tube heating device according to any one of claims 1 to 4.
The planar heating element is a resin tube heating device characterized in that a carbon graphite layer is coated on a mixed paper of carbon fibers and pulp fibers. In the resin tube heating device according to any one of claims 1 to 5.
The planar heating element is composed of a plurality of band-shaped heating elements, and electrodes formed at both ends in the longitudinal direction of the band-shaped heating element are connected in series in accordance with a power supply voltage. Resin tube heating device.

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