Resin tube diameter reduction device

Abstract

A single device performs a series of operations to reduce the diameter of the ends of resin tubes. [Solution] The resin tube diameter reduction device 100 comprises a holding mechanism 1 for holding the resin tube 200, a heating mechanism 2 for heating the resin tube 200, a cooling mechanism 4 for cooling the resin tube 200, and a drive mechanism 5 capable of moving the heating mechanism 2 and the cooling mechanism 4. The cooling mechanism 4 has a molding die in which a molding hole smaller in diameter than the end of the resin tube 200 before diameter reduction is formed. The driving mechanism 5 moves the heating mechanism 2 and the cooling mechanism 4, thereby bringing the holding mechanism 1 and the molding dies of the heating mechanism 2 and the cooling mechanism 4 closer together or further apart.

Description

Technical Field

[0001] The present invention relates to a device for reducing the diameter of a resin tube.

Background Art

[0002] It is known to insert the end of a resin tube inside a connector and join the end of the resin tube and the connector by welding or the like. Here, since the outer diameters and shapes of all resin tubes are not the same, it may be difficult to insert the end of the resin tube inside the connector. Therefore, by reducing the diameter of the end of the resin tube, the end of the resin tube may be made to have a certain outer diameter and shape.

[0003] As a method for reducing the diameter of the end of a resin tube, as described in Patent Document 1 and the like, a method is known in which the end of the resin tube is heated, inserted into a forming hole of a diameter-reducing die, and immediately after insertion, the end of the resin tube is cooled while in the inserted state. In the method described in Patent Document 1, since the end of the resin tube is heated, the end of the resin tube is immersed in a heating oil bath such as heating glycerin. Then, the end of the resin tube is pulled up, inserted into the forming hole of the diameter-reducing die, and the end of the resin tube is cooled by spraying water on the outer surface of the die or flowing cold water through the die.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the method described in Patent Document 1, a heated oil bath is prepared to heat the end of the resin tube. After heating the end of the resin tube by immersing it in the heated oil bath, the end of the resin tube is lifted out and the oil is wiped off. Next, a mold for diameter reduction and equipment that can use cold water are prepared to reduce the diameter of the end of the resin tube and cool it. Thus, in the method described in Patent Document 1, the worker prepares different containers or equipment for each step of the process and uses them to perform each step.

[0006] If a single device could perform the entire process of reducing the diameter of the ends of resin tubes, it would lead to a reduction in the workload of the workers.

[0007] The present invention aims to provide a resin tube diameter reduction device that can perform a series of operations for reducing the diameter of the end of a resin tube using a single device. [Means for solving the problem]

[0008] The resin tube diameter reduction device disclosed herein comprises a holding mechanism for holding the resin tube, a heating mechanism for heating the resin tube, a cooling mechanism for cooling the resin tube, and a drive mechanism capable of moving the holding mechanism, or the heating mechanism and / or the cooling mechanism, wherein the cooling mechanism has a molding die in which a molding hole smaller in diameter than the end of the resin tube before diameter reduction is formed, and the driving mechanism moves the holding mechanism, or one or both of the heating mechanism and / or the cooling mechanism, thereby bringing the holding mechanism and the molding die of the heating mechanism and / or the cooling mechanism closer together or further apart.

[0009] In this specification, "tube" refers to a cylindrical component. In this specification, "tube" includes not only what is called a "pipe" but also what is called a "hose."

[0010] According to the above apparatus, a series of operations, including heating, diameter reduction molding, and cooling of the end of a resin tube, can be performed with a single device to reduce the diameter of the end of the resin tube. Specifically, the drive mechanism brings the holding mechanism and the heating mechanism closer together, and the end of the resin tube is heated while being held. Then, the holding mechanism and the molding die of the cooling mechanism are brought closer together, and the end of the resin tube is inserted into the molding hole of the molding die while being held, and then cooled. This makes it possible to reduce the diameter of the end of the resin tube.

[0011] Furthermore, in the above-described apparatus, the heating mechanism and the cooling mechanism may be connected, and the heating mechanism and the cooling mechanism may move together as a single unit by the drive mechanism.

[0012] With the above configuration, the drive mechanism can move both the heating mechanism and the cooling mechanism simultaneously. This simplifies the device configuration compared to a configuration where each mechanism is moved individually.

[0013] Furthermore, in the above apparatus, the heating mechanism and the cooling mechanism are arranged side by side in the vertical direction, and the heating mechanism and the cooling mechanism are arranged such that the molding die of the heating mechanism and / or the cooling mechanism faces the holding mechanism, and the drive mechanism is capable of moving the heating mechanism and the cooling mechanism in the vertical direction, as well as moving the heating mechanism and the cooling mechanism in a direction facing the holding mechanism.

[0014] By arranging the heating and cooling mechanisms, which are different mechanisms, in a vertical direction, the required installation space for the device can be kept to a minimum. Furthermore, by using a drive mechanism to move the heating and cooling mechanisms together in the vertical direction in which they are aligned, one or both of the molding dies for the heating and cooling mechanisms can be positioned facing the holding mechanism. With them facing each other, the driving mechanism can be used to move the heating and cooling mechanisms in a direction away from the holding mechanism, thereby bringing the heating and / or cooling mechanisms closer to or further away from the holding mechanism.

[0015] Furthermore, in the above configuration, the holding mechanism has a plurality of holding parts for holding resin tubes, the plurality of holding parts are arranged in parallel directions perpendicular to the direction in which the holding mechanism and the heating mechanism or the cooling mechanism face each other, and perpendicular to the vertical direction, the heating mechanism has a plurality of heating devices, the plurality of heating devices are arranged in the parallel directions, the cooling mechanism has a plurality of molding dies, the plurality of molding dies are arranged in the parallel directions, and the plurality of heating devices and the plurality of molding dies move together as a single unit by the drive mechanism, so that the plurality of heating devices or the plurality of molding dies move closer to or further away from the plurality of holding parts, respectively.

[0016] According to the above configuration, a single device can simultaneously heat the ends of multiple resin tubes. Furthermore, a single device can simultaneously reduce the diameter of the ends of multiple resin tubes and cool them. This allows a single device to simultaneously reduce the diameter of the ends of multiple resin tubes.

[0017] Furthermore, in the above configuration, the heating mechanism includes an insertion part having an insertion hole into which the end of the resin tube before diameter reduction is inserted, and a heating device capable of heating the insertion part, and comprises a detection mechanism that detects when the end of the resin tube is inserted into the insertion hole, and a control unit capable of controlling the drive mechanism, wherein when the detection mechanism detects that the end of the resin tube is inserted into the insertion hole, the control unit may, after a predetermined time has elapsed, move the holding mechanism, or at least the heating mechanism of the heating mechanism and cooling mechanism, by the drive mechanism so that the holding mechanism and the heating mechanism are separated, and then move the holding mechanism, or at least the cooling mechanism of the heating mechanism and cooling mechanism, so that the holding mechanism and the cooling mechanism are separated.

[0018] According to the above configuration, the heating mechanism includes an insertion part with an insertion hole and a heating tool. By inserting the end of the resin tube into the insertion hole, the end of the resin tube can be heated, and after heating, it is only necessary to remove the end of the resin tube from the insertion hole.

[0019] Also, according to the above configuration, after the detection mechanism detects that all of the end portion (the diameter-reducing portion) of the resin tube has been inserted into the insertion hole of the heating mold, the operation for reducing the diameter of the end portion of the resin tube proceeds by the control unit. Thereby, the diameter-reducing portion of the resin tube can be surely softened and the diameter can be reduced.

[0020] In the above configuration, the holding mechanism has a first holding portion and a second holding portion that sandwich the resin tube from a direction orthogonal to the longitudinal direction of the resin tube, the control unit can control the holding mechanism, and when the detection mechanism detects that the end portion of the resin tube has been inserted into the insertion hole, the control unit may move one or both of the first holding portion and the second holding portion toward the other to sandwich the end portion of the resin tube by the first holding portion and the second holding portion.

[0021] According to the above configuration, when the detection mechanism detects that all of the end portion (the diameter-reducing portion) of the resin tube has been inserted into the insertion hole of the heating mold, the resin tube is held in that state and the operation for reducing the diameter of the end portion of the resin tube proceeds.

[0022] In the above configuration, the cooling mechanism may include an outer cooling means capable of cooling the molding hole from the outside and an inner cooling means capable of cooling the molding hole from the inside.

[0023] With the above configuration, the outer cooling means and the inner cooling means can efficiently cool the end portion of the resin tube inserted into the molding hole of the cooling mechanism from the outside and the inside.

Advantages of the Invention

[0024] It is possible to provide a resin tube diameter-reducing device capable of performing a series of operations for reducing the diameter of the end portion of a resin tube with one device.

Brief Description of the Drawings

[0025] [Figure 1] It is a schematic configuration diagram showing the appearance and internal structure of a resin tube diameter reduction device according to an embodiment. [Figure 2] It is a view of the holding mechanism shown in FIG. 1 as seen from the direction of II. [Figure 3] It is a view of the holding mechanism shown in FIG. 1 as seen from the direction of III-III. [Figure 4] It is a longitudinal sectional view of the heating mechanism shown in FIG. 1 along the X direction and the Y direction. [Figure 5] It is a view of the heating mechanism and the cooling mechanism shown in FIG. 1 as seen from the direction of V-V. [Figure 6] It is a longitudinal sectional view of the cooling mechanism shown in FIG. 1 along the X direction and the Y direction. [Figure 7] It is a diagram for explaining the process of reducing the diameter of a resin tube using a resin tube diameter reduction device (before inserting the resin tube into the heating mechanism (standby state)). [Figure 8] It is a diagram for explaining the process of reducing the diameter of a resin tube using a resin tube diameter reduction device (after inserting the resin tube into the heating mechanism). [Figure 9] It is an enlarged view of the portion surrounded by the two-dot chain line in FIG. 8. [Figure 10] It is a diagram for explaining the process of reducing the diameter of a resin tube using a resin tube diameter reduction device (after holding the resin tube). [Figure 11] It is a diagram for explaining the process of reducing the diameter of a resin tube using a resin tube diameter reduction device (after heating the end of the resin tube). [Figure 12] It is a diagram for explaining the process of reducing the diameter of a resin tube using a resin tube diameter reduction device (movement of the heating mechanism and the cooling mechanism). [Figure 13] It is a diagram for explaining the process of reducing the diameter of a resin tube using a resin tube diameter reduction device (molding and cooling of the resin tube). [Figure 14] It is an enlarged view of the portion surrounded by the two-dot chain line in FIG. 13. [Figure 15] It is a diagram for explaining the process of reducing the diameter of a resin tube using a resin tube diameter reduction device (after molding and cooling of the resin tube). [Figure 16] This diagram illustrates the process (standby state) of reducing the diameter of a resin tube using a resin tube reduction device. [Modes for carrying out the invention]

[0026] The embodiments will be described below with reference to the drawings.

[0027] [Resin tube diameter reduction device] Figure 1 shows an external view and a partial cross-sectional view of the resin tube diameter reduction device 100. In Figure 1, the hatching indicating the cross-section has been omitted. Figure 1 also shows a state in which the resin tube diameter reduction device 100 is in operation.

[0028] As shown in Figure 1, the resin tube diameter reduction device 100 includes a holding mechanism 1 for holding the resin tube 200, a heating mechanism 2, a detection mechanism 3, a cooling mechanism 4, a drive mechanism 5, and a control unit 6.

[0029] The heating mechanism 2 and the detection mechanism 3 are integrated. The cooling mechanism 4 is positioned above the heating mechanism 2 and the detection mechanism 3. The heating mechanism 2 and the detection mechanism 3 and the cooling mechanism 4 are connected by a connecting member 7.

[0030] The heating mechanism 2 and the cooling mechanism 4 are opposite the holding mechanism 1.

[0031] The end of the resin tube 200 (see "end 200E of resin tube 200" shown in Figure 10 later) is reduced in diameter by the resin tube diameter reduction device 100. The reduced diameter end of the resin tube 200 is then inserted into a connector, for example, and joined to the connector by welding. The material of the resin tube 200 is not particularly limited as long as it is a thermoplastic resin. The resin tube 200 may be, for example, a polyamide tube or a polyolefin tube.

[0032] Hereafter, the vertical direction will be referred to as the "vertical direction" or "X direction." The direction in which the holding mechanism 1 and the heating mechanism 2 and / or cooling mechanism 4 face each other will be referred to as the "Y direction." The Y direction includes the direction parallel to the direction in which the holding mechanism 1 and the heating mechanism 2 and / or cooling mechanism 4 face each other. The direction that is perpendicular to both the X direction and the Y direction will be referred to as the "Z direction" (parallel direction). The X direction, Y direction and Z direction are mutually orthogonal.

[0033] [Retention mechanism] Figure 2 shows a view of the holding mechanism 1 shown in Figure 1 from direction II. As shown in Figure 2, the holding mechanism 1 includes a clamp cylinder 11, a clamp 12, and a support member 13. The clamp 12 has a pair of clamping parts, which consist of an upper first clamping part 12A and a lower second clamping part 12B.

[0034] (Clamp cylinder) The clamp cylinder 11 extends and retracts in the X direction (up and down direction). The tip of the rod of the clamp cylinder 11 is connected to the upper first clamping portion 12A of the clamp 12. The extension and retraction of the clamp cylinder 11 causes the first clamping portion 12A to move in the X direction. The clamp cylinder 11 may be, for example, a hydraulic clamp cylinder or a pneumatic clamp cylinder.

[0035] (Clamp) The upper first clamping portion 12A and the lower second clamping portion 12B of the clamp 12 clamp the resin tube 200 shown in Figure 1 from above and below.

[0036] As shown in Figure 2, when the first clamping portion 12A and the second clamping portion 12B are closed, the clamp 12 has two through holes: a first tube hole (holding portion) 12H1 and a second tube hole (holding portion) 12H2. The first tube hole 12H1 and the second tube hole 12H2 are separated by a predetermined distance in the Z direction. A resin tube 200 is placed in the first tube hole 12H1 and the second tube hole 12H2.

[0037] Figure 3 shows a schematic diagram of the resin tube diameter reduction device 100 shown in Figure 1, along the line III-III. In Figure 3, hatching indicating the cross-section is omitted. In Figure 3, the first tube hole 12H1 and the second tube hole 12H2 face the cooling mechanism 4. The end of the first tube hole 12H1 opposite the cooling mechanism 4 is tapered and widens toward the cooling mechanism 4. The end of the second tube hole 12H2 opposite the cooling mechanism 4 is also tapered and widens toward the cooling mechanism 4.

[0038] By placing the resin tubes 200 in both the first tube hole 12H1 and the second tube hole 12H2, the holding mechanism 1 can simultaneously hold the two resin tubes 200. Alternatively, the resin tubes 200 may be placed in only one of the first tube hole 12H1 or the second tube hole 12H2.

[0039] During operation of the resin tube diameter reduction device 100, as shown in Figure 3, the end portion 200E of the resin tube 200 is positioned outside the first tube hole 12H1 and the second tube hole 12H2. The "end portion 200E of the resin tube 200" is the part of the resin tube 200 that is reduced in diameter. The end portion 200E of the resin tube 200 is not gripped by the first clamping portion 12A and the second clamping portion 12B shown in Figure 2.

[0040] (Support material) The support member 13 shown in Figure 2 supports the clamp cylinder 11 and the clamp 12. The support member 13 supports the clamp cylinder 11 so that it can extend and retract in the X direction. The first clamping portion 12A moves vertically along the support member 13. The second clamping portion 12B is fixed to the support member 13.

[0041] [Heating mechanism] Figure 4 shows longitudinal cross-sectional views of the heating mechanism 2 and detection mechanism 3 shown in Figure 1, along the X and Y directions. As shown in Figure 4, the heating mechanism 2 and detection mechanism 3 are continuous and integrated in the Y direction.

[0042] The heating mechanism 2 includes a heating mold (insertion part) 21 and a heating tool 22.

[0043] (Heating type) A through-hole extending in the Y direction is formed in the heating mold 21. The first movable part 31 is positioned in the through-hole, thereby forming a bottomed tube insertion hole (insertion hole) 21H in the heating mold 21. The first movable part 31 forms the bottom of the tube insertion hole 21H. The first movable part 31 is positioned on the detection mechanism 3 side. The first movable part 31 is movable in the Y direction within the through-hole of the heating mold 21.

[0044] The core 70 protrudes in the Y direction from the first movable part 31 toward the opening of the tube insertion hole 21H. The core 70 protrudes to the outside of the tube insertion hole 21H. The outer diameter of the core 70 is smaller than the inner diameter of the tube insertion hole 21H. When the resin tube 200 is placed in the tube insertion hole 21H, the core 70 is positioned inside the resin tube 200.

[0045] When the resin tube 200 is not inserted into the tube insertion hole 21H, the length of the tube insertion hole 21H in the Y direction is equal to the length of the diameter-reducing portion of the resin tube 200 (the length of the "end portion 200E of the resin tube 200" shown in Figure 10). The "length of the tube insertion hole 21H in the Y direction" is the length from the opening of the tube insertion hole 21H to the first movable portion 31.

[0046] The inner diameter of the tube insertion hole 21H may be smaller than the outer diameter of the resin tube 200 before reduction, or it may be larger than or equal to the outer diameter of the resin tube 200 before reduction.

[0047] The heating element 21 and the core 70 are made of, for example, metal.

[0048] (heating tool) The heating element 22 is located on the outside of the heating mold 21. The heating element 22 is, for example, mounted on the outer surface of the heating mold 21, extending around its entire circumference. The heating element 22 is, for example, a band heater. The heating element 22 is connected to, for example, a switch (not shown). Turning the switch ON or OFF starts or stops heating by the heating element 22.

[0049] The heating device 22 heats the heating mold 21, which in turn heats the end 200E of the resin tube 200 inserted into the tube insertion hole 21H (see Figure 10). The end 200E of the resin tube 200 is heated to a temperature lower than the temperature at which the resin tube 200 softens, for example, a temperature lower than the melting point of the resin material of the resin tube 200.

[0050] The position of the heating element 22 is not limited to the position described above. Furthermore, the heating element 22 is not limited to a band heater. For example, a coil may be wound around the outer surface of the heating mold 21. Alternatively, the heating element 22, such as a coil or heater, may be embedded in the heating mold 21. The heating element 22 may be located away from the heating mold 21.

[0051] [Detection mechanism] As shown in Figure 4, the detection mechanism 3 is continuous with the heating mechanism 2 in the Y direction. The detection mechanism 3 includes a first moving part 31, a second moving part 32, a third moving part 33, a helical spring 34, a sensor dog 35, and a sensor 36.

[0052] The first movable part 31 is located inside the heating mold 21. The first movable part 31 is movable in the Y direction.

[0053] The second movable part 32 is connected to the first movable part 31 in the Y direction. The second movable part 32 is located on the opposite side from the core 70.

[0054] The second movable part 32 is positioned in the first outer wall through-hole 71h formed in the first outer wall portion 71. The first outer wall portion 71 is connected to the heating mold 21 in the Y direction. The first outer wall through-hole 71h penetrates the first outer wall portion 71 in the Y direction. The second movable part 32 is movable in the Y direction within the first outer wall through-hole 71h. A portion of the first movable part 31 can be inserted into the first outer wall through-hole 71h. The length of the second movable part 32 in the Y direction is shorter than the length of the first outer wall through-hole 71h in the Y direction.

[0055] The outer diameter of the second movable part 32 is smaller than the outer diameter of the first movable part 31. A spiral spring 34 is present around the second movable part 32. The end of the first movable part 31 is in contact with the spring 34.

[0056] The third movable part 33 is connected to the second movable part 32 in the Y direction. The third movable part 33 is a rod-shaped member that is long in the Y direction.

[0057] The third movable part 33 is positioned in the second outer wall through-hole 72h formed in the second outer wall portion 72. The second outer wall portion 72 is connected to the first outer wall portion 71 in the Y direction.

[0058] The second outer wall portion 72 has a bottom wall portion 72B and an outer peripheral wall portion 72C. The second outer wall through-hole 72h penetrates the bottom wall portion 72B and the outer peripheral wall portion 72C in the Y direction. The second outer wall through-hole 72h communicates with the first outer wall through-hole 71h in the Y direction. Here, the inner diameter of the second outer wall through-hole 72h formed in the bottom wall portion 72B is smaller than the outer diameter of the second movable portion 32. Therefore, when the second movable portion 32 moves in the Y direction, the second movable portion 32 comes into contact with the bottom wall portion 72B and is not inserted into the second outer wall through-hole 72h.

[0059] When the resin tube 200 is not inserted into the tube insertion hole 21H, as shown in Figure 4, the end of the third movable part 33 is positioned in the first outer wall penetration hole 71h, and the remaining part of the third movable part 33 is positioned in the second outer wall penetration hole 72h.

[0060] The inner diameter of the second outer wall through-hole 72h formed in the outer peripheral wall portion 72C of the second outer wall portion 72 is larger than the outer diameter of the third movable portion 33. A sensor dog 35 is attached to the outer peripheral surface of the third movable portion 33 which is positioned in the second outer wall through-hole 72h.

[0061] A sensor 36 is embedded in the outer peripheral wall portion 72C of the second outer wall portion 72. The sensor 36 is located on the opposite side of the bottom wall portion 72B from the sensor dog 35. As shown in Figure 4, the sensor 36 is separated from the sensor dog 35 in the Y direction.

[0062] The sensor dog 35 and sensor 36 may be configured as follows, for example. As the third moving part 33 moves in the Y direction, the sensor dog 35 also moves in the Y direction. When the sensor dog 35 approaches the sensor 36 and the distance between the sensor dog 35 and the sensor 36 becomes a predetermined distance, the sensor 36 detects the sensor dog 35 without contact. The sensor 36 may also detect the sensor dog 35 by coming into contact with it.

[0063] Here, we will explain an example of the operation of the heating mechanism 2 and the detection mechanism 3.

[0064] With the switch of the heating device 22 shown in Figure 4 turned ON, the end 200E of the resin tube 200 is inserted into the tube insertion hole 21H (see Figure 10). At this time, the core 70 shown in Figure 4 is inserted inside the end 200E of the resin tube 200.

[0065] In the Y direction, when the entire end 200E of the resin tube 200 is inserted into the tube insertion hole 21H, the end 200E of the resin tube 200 comes into contact with the first movable part 31 shown in Figure 4 and presses against the first movable part 31. As a result, the first movable part 31 moves to the opposite side of the resin tube 200 (to the left in Figure 4). Consequently, the spring 34 is compressed and contracts. As the first movable part 31 moves, the second movable part 32 and the third movable part 33 also move in the same direction as the first movable part 31, that is, to the opposite side of the resin tube 200 (to the left in Figure 4), and the sensor dog 35 moves closer to the sensor 36.

[0066] When the sensor dog 35 and the sensor 36 are at a predetermined distance from each other, and the sensor 36 detects the sensor dog 35, a signal is sent from the sensor 36 to the control unit 6 (see Figure 1). Upon receiving this signal, the control unit 6 causes the rod of the clamp cylinder 11 of the holding mechanism 1 shown in Figure 1 (see Figure 2) to be pushed out, as will be described later. After receiving this signal, the control unit 6 also causes the rod of the second cylinder 52 of the drive mechanism 5 shown in Figure 1 to be retracted after a predetermined time has elapsed. This causes the resin tube 200 to be removed from the tube insertion hole 21H. The "predetermined time" mentioned above is the time required for the end 200E of the resin tube 200 to soften sufficiently.

[0067] When the resin tube 200 is removed from the tube insertion hole 21H, the contracted spring 34 is released from the first moving part 31 and returns to its original state. The length of the tube insertion hole 21H in the Y direction is the length of the resin tube 200 before the end 200E is inserted, that is, the length of the end 200E of the resin tube 200 (the length of the part that contracts in diameter).

[0068] Furthermore, if the end 200E of the resin tube 200 is inserted into the tube insertion hole 21H but the end 200E of the resin tube 200 does not come into contact with the first movable part 31, or if the end 200E of the resin tube 200 comes into contact with the first movable part 31 but the first movable part 31 does not move to the left in Figure 4, the sensor dog 35 will not approach the sensor 36. In these cases, no signal will be sent from the sensor 36 to the control unit 6 (see Figure 1).

[0069] Figure 5 shows a view of the heating mechanism 2, detection mechanism 3, and cooling mechanism 4 shown in Figure 1, from the VV direction. Two heating mechanisms 2 are arranged side by side at a predetermined interval in the Z direction. In Figure 5, the detection mechanism 3 is located behind each of the two heating mechanisms 2. The distance between the two heating mechanisms 2 is the same as the distance between the first tube hole 12H1 and the second tube hole 12H2 shown in Figure 2. By using the two heating mechanisms 2, the ends 200E of two resin tubes 200 can be heated simultaneously. Note that only one of the two heating mechanisms 2 may be used.

[0070] [Cooling mechanism] Figure 6 shows longitudinal cross-sectional views of the cooling mechanism 4 shown in Figure 1, along the X and Y directions. As shown in Figure 6, the cooling mechanism 4 includes a molding die 41, a core metal 42, and a cooling jacket 43.

[0071] A molding hole 41H is formed in the molding mold 41. The molding hole 41H is a cylindrical hole into which the end portion 200E of the resin tube 200 can be inserted.

[0072] A mandrel 42 is fitted into the molding die 41. The mandrel 42 protrudes in the Y direction from the inside of the molding hole 41H. The mandrel 42 also protrudes from the outside of the molding hole 41H. A bottomed cylindrical molding hole 41H is formed between the outer surface of the mandrel 42 and the inner surface of the molding die 41.

[0073] When the end 200E of the resin tube 200 is inserted into the molding hole 41H, the core metal 42 is positioned inside the resin tube 200.

[0074] The length of the molding hole 41H in the Y direction is the length of the part of the resin tube 200 that shrinks in diameter ("the length of the end 200E of the resin tube 200"). The outer diameter of the molding hole 41H (the inner diameter of the molding mold 41) is smaller than the outer diameter of the end 200E of the resin tube 200 before shrinking. By inserting the end 200E of the resin tube 200 into the molding hole 41H, the outer diameter of the end 200E of the resin tube 200 is reduced.

[0075] A core channel 42p through which a low-temperature gas flows is formed in the core metal 42. A molding die channel 41p through which a low-temperature gas flows is formed in the molding die 41. The core channel 42p communicates with the molding die channel 41p. The core channel 42p passes through the central axis of the core metal 42 and extends from this central axis toward the outer surface of the core metal 42. The core channel 42p communicates with the molding hole 41H. Part or all of the core channel 42p is located in a portion that radially overlaps with the molding hole 41H. Also, a portion of the core metal is located in a portion that radially overlaps with the molding hole 41H.

[0076] The low-temperature gas supplied to the molding channel 41p flows through the molding channel 41p to the mandrel channel 42p and is injected into the molding hole 41H. The mandrel 42 is also cooled by the low-temperature gas flowing through the mandrel channel 42p. The end 200E of the resin tube 200 inserted into the molding hole 41H is cooled from the inside by the low-temperature gas injected into the molding hole 41H and the cooled mandrel 42.

[0077] Here, the "low-temperature gas" flowing through the molding channel 41p and the core metal channel 42p is a gas at a temperature capable of curing the softened end 200E of the resin tube 200. The type of gas is not particularly limited. The gas may be, for example, air.

[0078] An "internal cooling means" is configured to cool the molding hole 41H from the inside, consisting of the molding flow channel 41p, the mandrel flow channel 42p, and the mandrel 42. Figure 6 shows the case when a low-temperature gas is flowing through the molding flow channel 41p and the mandrel flow channel 42p.

[0079] The cooling jacket 43 shown in Figure 6 is attached to the entire circumferential surface of the outer circumference of the molding die 41. The cooling jacket 43 is located in the portion that radially overlaps with the molding hole 41H.

[0080] The cooling jacket 43 has an outer peripheral channel 43P through which a low-temperature gas or liquid flows. The outer peripheral channel 43P is formed along the entire circumferential direction of the outer peripheral of the molding die 41.

[0081] The cooling jacket 43 is cooled by the flow of a low-temperature gas or liquid through the outer peripheral channel 43P. The end 200E of the resin tube 200 inserted into the molding hole 41H is cooled from the outside by the cooled cooling jacket 43.

[0082] The "low-temperature gas or liquid" flowing through the outer peripheral channel 43P is a gas or liquid at a temperature capable of curing the softened end 200E of the resin tube 200. The type of gas is not particularly limited. The gas may be, for example, air. The type of liquid is not particularly limited. The liquid may be, for example, water.

[0083] The cooling jacket 43 and the outer peripheral channel 43P constitute an "external cooling means" that can cool the molding hole 41H from the outside. Figure 6 shows the case when a low-temperature gas or liquid is flowing through the outer peripheral channel 43P.

[0084] The molding die 41, the core metal 42, and the cooling jacket 43 are, for example, made of metal.

[0085] As shown in Figure 5, two cooling mechanisms 4 are arranged side by side at a predetermined interval in the Z direction. The distance between the two cooling mechanisms 4 is the same as the distance between the first tube hole 12H1 and the second tube hole 12H2 shown in Figure 2. By utilizing the two cooling mechanisms 4, the ends 200E of the two resin tubes 200 can be simultaneously reduced in diameter and cooled.

[0086] As shown in Figures 1 and 5, two heating mechanisms 2, two detection mechanisms 3, and two cooling mechanisms 4 are integrated by a connecting member 7. Specifically, the second outer wall portion 72 of the detection mechanism 3 shown in Figure 4 is connected to the connecting member 7 shown in Figure 1. The cooling mechanism 4 shown in Figure 6 is connected to the connecting member 7 shown in Figure 1.

[0087] [Drive mechanism] The drive mechanism 5 shown in Figure 1 includes a first cylinder 51 and a second cylinder 52.

[0088] Figure 1 shows, as an example, a configuration in which the first cylinder 51 and the second cylinder 52 are extendable or retractable by pushing or pulling in a rod (hereinafter, the ability to extend or retract will be referred to as "extendable").

[0089] The first cylinder 51 and the second cylinder 52 are supported by a support member 8. The first cylinder 51 is supported by the support member 8 so as to be extendable and retractable in the X direction (up and down direction). The tip of the rod of the first cylinder 51 is connected to a connecting member 7. The connecting member 7 is supported by the support member 8 so as to be slidable in the X direction. The tip of the rod of the second cylinder 52 is connected to the support member 8. The support member 8 is slidable in the Y direction.

[0090] The first cylinder 51 extends and retracts in the X direction (up and down direction). The connecting member 7 moves in the X direction due to the first cylinder 51. The heating mechanism 2, the detection mechanism 3, and the cooling mechanism 4 move in the X direction together with the connecting member 7.

[0091] The second cylinder 52 extends and retracts in the Y direction. The support member 8 moves in the Y direction due to the second cylinder 52. The connecting member 7, heating mechanism 2, detection mechanism 3, and cooling mechanism 4 move in the Y direction together with the support member 8.

[0092] The first cylinder 51 and the second cylinder 52 can move the two heating mechanisms 2 closer to or further away from the holding mechanism 1. The first cylinder 51 and the second cylinder 52 can also move the two cooling mechanisms 4 closer to or further away from the holding mechanism 1.

[0093] Here, with reference to Figures 2, 3, and 5, an example of how each mechanism is driven by the first cylinder 51 and the second cylinder 52 will be described.

[0094] By adjusting the height of the heating mechanism 2 with the first cylinder 51 shown in Figure 1, the heating mechanism 2 can be positioned opposite the holding mechanism 1. As a result, the first tube hole 12H1 and the second tube hole 12H2 of the holding mechanism 1 shown in Figure 2 face the tube insertion holes 21H of the two heating mechanisms 2 shown in Figure 5, respectively. By moving the heating mechanism 2 in the Y direction using the second cylinder 52 shown in Figure 1, the opposing holes and openings move closer together or further apart.

[0095] By adjusting the height of the cooling mechanism 4 with the first cylinder 51 shown in Figure 1, the first tube hole 12H1 and the second tube hole 12H2 shown in Figure 2 face the molding holes 41H of the two cooling mechanisms 4 shown in Figure 5, respectively (see Figure 3). By moving the cooling mechanism 4 in the Y direction using the second cylinder 52 shown in Figure 1, the opposing holes and openings move closer together or further apart.

[0096] [Control Unit] The control unit 6 shown in Figure 1 controls the holding mechanism 1 and the drive mechanism 5, etc.

[0097] The control unit 6 can, for example, push out or retract the rod of the clamp cylinder 11 of the holding mechanism 1 shown in Figures 1 and 2 to a predetermined length at a predetermined timing. As a result, the upper first clamping portion 12A of the clamp 12 descends or rises, thereby holding the resin tube 200 or releasing the resin tube 200.

[0098] The control unit 6 controls, for example, the timing and length of extension and retraction of the first cylinder 51 and the second cylinder 52 of the drive mechanism 5 shown in Figure 1. For example, the control unit 6 pushes out or retracts the rod of the first cylinder 51 to a predetermined length at a predetermined timing. For example, the control unit 6 pushes out or retracts the rod of the second cylinder 52 to a predetermined length at a predetermined timing.

[0099] For example, when the sensor 36 of the detection mechanism 3 shown in Figure 4 detects the sensor dog 35, the control unit 6 receives a signal from the sensor 36, and after a predetermined time has elapsed since the signal was received, it causes the rod of the second cylinder 52 to be retracted to a predetermined length. Subsequently, at predetermined timings, it causes the rod of the first cylinder 51 or the rod of the second cylinder 52 to be pushed out or retracted to a predetermined length.

[0100] Furthermore, the control unit 6 may also be capable of controlling mechanisms other than the drive mechanism 5.

[0101] [Operation of the resin tube diameter reduction device] Next, an example of the operation of the resin tube diameter reduction device 100 will be explained with reference to Figures 7 to 16. In Figures 7 to 16, hatching indicating the cross-section has been omitted in some places.

[0102] As shown in Figure 7, the first clamping portion 12A of the clamp 12 is raised by retracting the rod of the clamp cylinder 11. This makes the width between the first clamping portion 12A and the second clamping portion 12B wider than the diameter of the resin tube 200. The heating mechanism 2 is also brought closer to the clamp 12. In the state shown in Figure 7, the heating mold 21 is in contact with the lower second clamping portion 12B of the clamp 12, and the core 70 is positioned between the first clamping portion 12A and the second clamping portion 12B.

[0103] Next, as shown in Figure 8, the end 200E of the resin tube 200 is pushed through the gap between the first clamping portion 12A and the second clamping portion 12B into the tube insertion hole 21H of the heating mechanism 2. Then, for example, the operator turns on a switch (not shown). Note that when the end 200E of the resin tube 200 is pushed into the tube insertion hole 21H, the switch of the heating device 22 is already turned ON.

[0104] When the end 200E of the resin tube 200 is pushed into the tube insertion hole 21H, the detection mechanism 3 and the control unit 6 operate as follows.

[0105] Figure 9 shows an enlarged view of the area enclosed by the dashed line in Figure 8. As shown in Figure 9, the entire end 200E of the resin tube 200 is inserted into the tube insertion hole 21H, and the end 200E of the resin tube 200 comes into contact with the first movable part 31, pressing against the first movable part 31, causing the first movable part 31 to move to the opposite side of the resin tube 200 (to the left in Figure 9). Consequently, the second movable part 32 and the third movable part 33 also move in the same direction as the first movable part 31 (to the left in Figure 9). As a result, the sensor dog 35 moves closer to the sensor 36.

[0106] When sensor 36 detects sensor dog 35, a signal is sent from sensor 36 to control unit 6 (see Figure 8).

[0107] As described above, after the worker pushes the end 200E of the resin tube 200 into the tube insertion hole 21H, the worker turns on a switch (not shown). In addition, when the control unit 6 receives a signal from the sensor 36, the control unit 6 pushes out the rod of the clamp cylinder 11, as shown in Figure 10. As a result, the first clamping part 12A of the clamp 12 descends, and the resin tube 200 is clamped by the first clamping part 12A and the second clamping part 12B. This maintains the state in which the entire end 200E of the resin tube 200 is inserted into the tube insertion hole 21H. The resin tube 200 is also clamped by the first clamping part 12A and the second clamping part 12B with the end 200E protruding from the clamp 12.

[0108] After the control unit 6 receives a signal from the sensor 36, the state shown in Figure 10 is maintained for a predetermined time. The end 200E of the resin tube 200 is heated by the heating mechanism 2 for a predetermined time. This "predetermined time" is the time required for the end 200E of the resin tube 200 to soften sufficiently. As a result, the end 200E of the resin tube 200 softens.

[0109] After detecting a signal from the sensor 36 and after a predetermined time has elapsed, the control unit 6 retracts the rod of the second cylinder 52. As a result, as shown in Figure 11, the heating mechanism 2 moves away from the end 200E of the resin tube 200, causing the end 200E of the resin tube 200 to exit through the tube insertion hole 21H.

[0110] Subsequently, the control unit 6 causes the rod of the first cylinder 51 to be pushed out to a predetermined length. The connecting member 7 descends, and the cooling mechanism 4 is positioned so that its molding hole 41H faces the end 200E of the resin tube 200, as shown in Figure 12.

[0111] From the state shown in Figure 12, the control unit 6 causes the rod of the second cylinder 52 to be pushed out to a predetermined length. The cooling mechanism 4 approaches the end 200E of the resin tube 200, and the end 200E (the part that shrinks in diameter) of the resin tube 200 is inserted into the molding hole 41H (see Figure 13). The cooling mechanism 4 comes into contact with the first clamping portion 12A and the second clamping portion 12B of the clamp 12, and as shown in Figure 13, the entire end 200E (the part that shrinks in diameter) of the resin tube 200 is inserted into the molding hole 41H.

[0112] Figure 14 shows an enlarged view of the area enclosed by the dashed line in Figure 13. As shown in Figure 14, a low-temperature gas is supplied to the core channel 42p in advance. In addition, a low-temperature gas or liquid is supplied to the cooling jacket 43 in advance. The end 200E of the resin tube 200 is cooled from the inside and the outside. This state is maintained for a predetermined time. This "predetermined time" is the time it takes for the softened end 200E of the resin tube 200 to completely harden. The end 200E of the resin tube 200 is molded to a reduced diameter by hardening in a contracted state at the molding hole 41H.

[0113] The control unit 6, for example, pushes the rod of the second cylinder 52 to a predetermined length, and after a predetermined time has elapsed for the end 200E of the resin tube 200 to harden, it retracts the rod of the second cylinder 52 to a predetermined length. The cooling mechanism 4 moves away from the end 200E of the resin tube 200, and the end 200E of the resin tube 200 is removed from the molding hole 41H (see Figure 15).

[0114] Furthermore, the control unit 6, for example, pushes out the rod of the second cylinder 52 to a predetermined length, and after a predetermined time has elapsed for the end 200E of the resin tube 200 to harden, it retracts the rod of the clamp cylinder 11. As a result, the first clamping part 12A rises, and the holding of the resin tube 200 is released. The operator then removes the resin tube 200 with its end 200E reduced in diameter.

[0115] The control unit 6 retracts the rod of the first cylinder 51 to a predetermined length from the state shown in Figure 15. This causes the heating mechanism 2 to face the second clamping portion 12B of the clamp 12. The control unit 6 then pushes out the rod of the second cylinder 52 to a predetermined length. This brings the heating mechanism 2 into contact with the second clamping portion 12B (see Figure 16). In this state, the control unit waits until another resin tube 200 is set.

[0116] Thus, the resin tube diameter reduction device 100 allows a series of operations, including heating, diameter reduction molding, and cooling, to reduce the diameter of the end 200E of the resin tube 200, to be performed in a single device.

[0117] Furthermore, as shown in Figure 1 and other figures, the detection mechanism 3 and the cooling mechanism 4, which are connected to the heating mechanism 2, are connected by a connecting member 7, so that the heating mechanism 2, the detection mechanism 3, the cooling mechanism 4, and the connecting member 7 are integrated into one unit. The end of the rod of the first cylinder 51 is connected to the connecting member 7, so that the heating mechanism 2, the detection mechanism 3, and the cooling mechanism 4 move together in the X direction (up and down direction) by the first cylinder 51. Furthermore, a support member 8 that supports the connecting member 7 is connected to the end of the rod of the second cylinder 52. The second cylinder 52 causes the support member 8, connecting member 7, heating mechanism 2, detection mechanism 3, and cooling mechanism 4 to move together in the Y direction.

[0118] Thus, the drive mechanism 5, which has the first cylinder 51 and the second cylinder 52, can move the heating mechanism 2, the detection mechanism 3, and the cooling mechanism 4 simultaneously. This simplifies the configuration of the device compared to a configuration in which each mechanism is moved individually.

[0119] Furthermore, as shown in Figures 1 and 5, the heating mechanism 2 and the cooling mechanism 4 are aligned in the X direction (vertical direction). By arranging different mechanisms vertically, the required installation space for the device can be minimized. In addition, by moving the heating mechanism 2 and the cooling mechanism 4 together in the X direction in which they are aligned, either the heating mechanism 2 or the cooling mechanism 4 can be easily positioned to face the end 200E of the resin tube 200.

[0120] Furthermore, as shown in Figure 2, since the holding mechanism 1 has two first tube holes 12H1 and a second tube hole 12H2, it is possible to hold two resin tubes 200 simultaneously. Also, as shown in Figure 5, since two heating mechanisms 2 are arranged side by side in one device, the ends 200E of two resin tubes 200 can be heated simultaneously. Also, as shown in Figure 5, since two cooling mechanisms 4 are arranged side by side in one device, the ends 200E of two resin tubes 200 can be simultaneously reduced in diameter and cooled. With the above configuration, a single device can simultaneously reduce the diameter of the ends 200E of multiple resin tubes 200.

[0121] Furthermore, the heating mechanism 2 shown in Figure 4 includes a heating mold 21 with a tube insertion hole 21H and a heating tool 22. By inserting the end 200E of the resin tube 200 into the tube insertion hole 21H, the end 200E of the resin tube 200 can be heated, and after heating, it is only necessary to remove the end 200E of the resin tube 200 from the tube insertion hole 21H.

[0122] Furthermore, the detection mechanism 3 shown in Figure 4 detects that the entire end 200E (the part to be reduced in diameter) of the resin tube 200 has been inserted into the tube insertion hole 21H, after which the control unit 6 (see Figure 1) proceeds with the operation to reduce the diameter of the end of the resin tube. This ensures that the part to be reduced in diameter (end 200E) of the resin tube 200 is reliably softened and reduced in diameter.

[0123] Furthermore, as shown in Figures 8 to 10, when the detection mechanism 3 detects that the entire end 200E (the part to be reduced in diameter) of the resin tube 200 has been inserted into the tube insertion hole 21H of the heating mold 21, it holds the resin tube 200 and proceeds with the process of reducing the diameter of the end 200E of the resin tube 200. This prevents the resin tube 200 from moving during the heating, diameter reduction molding, and cooling processes of the end 200E of the resin tube 200, allowing these operations to be performed stably.

[0124] Furthermore, the cooling mechanism 4 shown in Figure 6 allows for efficient cooling of the end portion 200E of the resin tube 200 inserted into the molding hole 41H from both the outside and the inside.

[0125] Although embodiments of the present invention have been described above with reference to the drawings, it should be understood that the specific configuration is not limited to these embodiments. Furthermore, the scope of the present invention is indicated not by the above description but by the claims, and all modifications within the meaning and scope equivalent to the claims are included.

[0126] For example, in the above embodiment, the case in which the heating mechanism 2, detection mechanism 3, and cooling mechanism 4 are moved by the drive mechanism 5 shown in Figure 1 was described. However, the heating mechanism 2, detection mechanism 3, and cooling mechanism 4 may remain stationary, and only the holding mechanism 1 may be movable. Furthermore, the resin tube diameter reduction device may further include a drive mechanism capable of moving the holding mechanism 1. Alternatively, the resin tube diameter reduction device may include a single drive mechanism capable of moving the holding mechanism 1, heating mechanism 2, and cooling mechanism 4.

[0127] Furthermore, the drive mechanism 5 shown in Figure 1 has a first cylinder 51 that extends and retracts in the X direction (vertical direction) and a second cylinder 52 that extends and retracts in the Y direction perpendicular to the first cylinder 51. However, the configuration of the drive mechanism 5 is not limited to the above configuration.

[0128] Furthermore, in the configuration shown in Figure 1, the heating mechanism 2, detection mechanism 3, and cooling mechanism 4 move together as a single unit via a connecting member 7, etc. However, the resin tube diameter reduction device may also be configured so that each mechanism moves individually. For example, the heating mechanism 2 and the cooling mechanism 4 may move separately. In this case, the drive mechanism for moving the heating mechanism 2 and the drive mechanism for the cooling mechanism 4 may be separate mechanisms, or they may be a single drive mechanism.

[0129] Furthermore, in the configuration shown in Figure 2, the holding mechanism 1 can simultaneously hold two resin tubes 200. However, the holding mechanism 1 may be configured to hold one resin tube 200, or it may be configured to hold three or more. When the holding mechanism 1 can simultaneously hold multiple resin tubes 200, the tube holes in which the resin tubes 200 are placed (for example, the first tube hole 12H1 and the second tube hole 12H2 shown in Figure 2) may be aligned in the Z direction, or they may be aligned in different directions.

[0130] Furthermore, in the configuration shown in Figure 5, the two heating mechanisms 2 are arranged side by side, allowing two resin tubes 200 to be heated simultaneously. However, the resin tube diameter reduction device 100 may have a configuration where only one resin tube 200 can be heated simultaneously, or it may have a configuration where three or more resin tubes 200 can be heated simultaneously. Also, if there are multiple resin tubes 200 that can be heated simultaneously, the multiple heating mechanisms 2 may be arranged in the Z direction, or they may be arranged in different directions.

[0131] Furthermore, in the configuration shown in Figure 5, the arrangement of two cooling mechanisms 4 side by side allows for simultaneous reduction in diameter molding and cooling of two resin tubes 200. However, the resin tube reduction device 100 may have a configuration that allows for simultaneous reduction in diameter molding and cooling of one resin tube 200, or three or more. Also, if there are multiple resin tubes 200 that can be simultaneously reduced in diameter molding and cooled, the multiple cooling mechanisms 4 may be arranged in the Z direction or in different directions.

[0132] Furthermore, in the embodiment described above, the two heating mechanisms 2 and the two cooling mechanisms 4 shown in Figure 5 move together as a single unit. However, a configuration in which each mechanism moves individually is also possible.

[0133] Furthermore, as shown in Figure 1, the heating mechanism 2 and the cooling mechanism 4 are aligned in the X direction (vertical direction). However, the heating mechanism 2 and the cooling mechanism 4 do not have to be aligned in the X direction. For example, the heating mechanism 2 and the cooling mechanism 4 may be aligned in the Z direction. In this case, there may be a drive mechanism that can move the heating mechanism 2 and the cooling mechanism 4 together in the Z direction. Alternatively, there may be one or more drive mechanisms that can move the heating mechanism 2 and the cooling mechanism 4 separately in the Z direction.

[0134] Furthermore, the heating mechanism 2 may have a configuration other than that shown in Figure 4. For example, the heating element 22 may be positioned separately from the heating mold 21. Also, the heating mechanism 2 may have a configuration that allows the heating element 22 to move closer to or away from the heating mold 21. Moreover, there may be a single heating element capable of heating multiple heating molds 21.

[0135] Furthermore, the detection mechanism 3 may have a configuration other than that shown in Figure 4. The detection mechanism 3 may also be located in a position other than that shown in Figure 4.

[0136] Furthermore, in the embodiment described above, the heating mechanism 2 and the detection mechanism 3 are separate, as shown in Figure 4 and other figures. However, the configuration of the heating mechanism 2 and the detection mechanism 3 is not limited to the above configuration. For example, a part of the heating mechanism 2 may be the detection mechanism 3. Alternatively, a single mechanism having both the heating mechanism 2 and the detection mechanism 3 may exist.

[0137] Furthermore, the cooling mechanism 4 may have a configuration other than that shown in Figure 6. For example, the configuration of the outer cooling means and the inner cooling means of the cooling mechanism 4 may be different from those shown in Figure 6. Also, the cooling mechanism 4 may have only an inner cooling means capable of cooling the end 200E of the resin tube 200 inserted into the molding hole 41H from the inside, or it may have only an outer cooling means capable of cooling the end 200E of the resin tube 200 from the outside.

[0138] Furthermore, in the embodiment described above, the resin tube diameter reduction device 100 is equipped with a control unit 6. However, the resin tube diameter reduction device 100 does not necessarily have to be equipped with a control unit 6. In this case, the operator may manually turn the switches of each mechanism ON or OFF.

[0139] Furthermore, the control by the control unit 6 in the above-described embodiment is just one example. The control unit 6 may be capable of other types of control. Also, the control unit 6 described above is capable of controlling the first cylinder 51 and the second cylinder 52 shown in Figure 1. However, the control unit capable of controlling the first cylinder 51 and the control unit capable of controlling the second cylinder 52 may be different. In this case, the resin tube diameter reduction device 100 may have multiple control units.

[0140] Furthermore, in the above-described embodiment, there may be a control unit capable of controlling the clamp cylinder 11 shown in Figure 1. Also, the control unit 6 may be capable of controlling the clamp cylinder 11.

[0141] Furthermore, in the embodiments described above, the configuration of the holding mechanism 1 shown in Figures 1 and 2 can be changed. For example, the second clamping portion 12B of the clamp 12 of the holding mechanism 1 may be movable in the vertical direction. Alternatively, both the first clamping portion 12A and the second clamping portion 12B may be configured to be movable in the vertical direction. Moreover, in the holding mechanism 1 shown in Figures 1 and 2, the resin tube 200 in the figures is clamped from the vertical direction. However, the direction in which the resin tube 200 is clamped is not particularly limited. For example, the resin tube 200 may be clamped from the Z direction as shown in Figure 2. [Explanation of Symbols]

[0142] 1 Retention mechanism 2 Heating mechanism 3. Detection mechanism 4 Cooling mechanism 5. Drive mechanism 6 Control Unit 7 Connecting members 8. Support Member 11 Clamp Cylinder 12 clamps 12A 1st clamping part 12B 2nd clamping part 12H1 First tube hole 12H2 2nd tube hole 21 Heating type (insertion part) 21H Tube insertion hole (insertion hole) 22 Heating tools 31. First Mobile Unit 32 Second Mobile Unit 33 Third Mobile Unit 34 Springs 35 Sensor Dog 36 sensors 41 Molding mold 41p Molding Mold Flow Channel 41H Molding hole 42 Mandrel 42p Core flow path 43 Cooling Jacket 43P Outer Peripheral Channel 70 cores 71 1st outer wall section 71h 1st outer wall through hole 72 Second outer wall section 72B Bottom wall 72C Outer wall 72h 2nd outer wall through hole 100 Resin tube diameter reduction device 200 resin tubes 200E end

Claims

1. A device for reducing the diameter of a resin tube, A holding mechanism for holding the resin tube, A heating mechanism for heating the resin tube, A cooling mechanism for cooling the resin tube, A drive mechanism capable of moving the holding mechanism, or the heating mechanism and the cooling mechanism, Equipped with, The cooling mechanism has a molding die in which a molding hole smaller in diameter than the end of the resin tube before it is reduced in diameter is formed. The drive mechanism moves the holding mechanism, or one or both of the heating mechanism and the cooling mechanism, thereby bringing the holding mechanism and the molding die of the heating mechanism and / or the cooling mechanism closer together or further apart. A device for reducing the diameter of resin tubes.

2. The heating mechanism and the cooling mechanism are connected, The aforementioned drive mechanism causes the heating mechanism and the cooling mechanism to move together as a single unit. The diameter reduction device for resin tubes according to claim 1.

3. The heating mechanism and the cooling mechanism are arranged side by side in the vertical direction. The heating mechanism and the cooling mechanism are arranged such that the molding die of the heating mechanism and / or the cooling mechanism faces the holding mechanism. The drive mechanism is capable of moving the heating mechanism and the cooling mechanism in the vertical direction, and is also capable of moving the heating mechanism and the cooling mechanism in a direction opposite to the holding mechanism. The diameter reduction device for resin tubes according to claim 2.

4. The holding mechanism has a plurality of holding parts for holding the resin tube, The multiple holding parts are arranged in parallel directions perpendicular to the direction in which the holding mechanism and the heating mechanism or the cooling mechanism face each other, and perpendicular to the vertical direction. The heating mechanism has a plurality of heating elements, Multiple heating devices are arranged in the parallel direction, The cooling mechanism has a plurality of the molding dies, Multiple molding dies are arranged in the parallel direction, The drive mechanism causes the multiple heating elements and the multiple molding dies to move together as a single unit, so that the multiple heating elements or the multiple molding dies move closer to or further away from the multiple holding parts. The diameter reduction device for resin tubes according to claim 3.

5. The aforementioned heating mechanism is An insertion part having an insertion hole into which the end of the resin tube before its diameter reduction is inserted, A heating device capable of heating the aforementioned insertion portion, It has, A detection mechanism for detecting that the end of the resin tube has been inserted into the insertion hole, A control unit capable of controlling the aforementioned drive mechanism, Equipped with, When the control unit detects that the end of the resin tube has been inserted into the insertion hole using the detection mechanism, after a predetermined time has elapsed, it moves the holding mechanism, or at least the heating mechanism of the heating mechanism and cooling mechanism, using the drive mechanism, so that the holding mechanism and the heating mechanism are separated, and then moves the holding mechanism, or at least the cooling mechanism of the heating mechanism and cooling mechanism, so that the holding mechanism and the cooling mechanism are brought closer together. A device for reducing the diameter of a resin tube according to claim 1 or 2.

6. The holding mechanism has a first clamping portion and a second clamping portion that clamp the resin tube from a direction perpendicular to the longitudinal direction of the resin tube, The control unit is capable of controlling the holding mechanism, When the control unit detects that the end of the resin tube has been inserted into the insertion hole using the detection mechanism, it moves one or both of the first and second clamping portions toward the other, thereby clamping the end of the resin tube with the first and second clamping portions. The diameter reduction device for resin tubes according to claim 5.

7. The cooling mechanism is An external cooling means capable of cooling the molding hole from the outside, An internal cooling means capable of cooling the molding hole from the inside, has A device for reducing the diameter of a resin tube according to claim 1 or 2.

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