JP2017001313A - Pipe bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe bending device capable of bending a pipe in an arbitrary bending amount.SOLUTION: A control unit drives an air cylinder 31 for a pipe 21 held by a pair of chucks 23 to move a fulcrum member 33 toward a bending processing part bp, while driving a servo motor 11 according to a bending angle and a bending radius designated by an instruction section to move a pair of moving stages 7 in directions approaching each other. Therein, installment directions of the chucks 23 holding the pipe 21 and the moving stages 7 are adjusted by a rotary shaft 19, so that the pipe 21 is bent at the bending processing part bp of the pipe 21 where the fulcrum member 33 comes in contact. Therefore, by changing the bending angle and the bending radius designated by the instruction section, the pipe 21 can be bent in an arbitrary bending angle and an arbitrary bending radius.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe bending apparatus for bending a resin pipe, and more particularly to a technique for bending a heated pipe.

  Conventionally, this type of apparatus includes an inner mold and an outer mold that are divided into a bent inner portion and a bent outer portion, and clamps a heated tube with the inner die and the outer die (for example, Patent Document 1).

  In this apparatus, the inner mold and the outer mold are clamped with the inner mold and the outer mold prepared in advance according to the bending amount of the pipe, for example, according to the bending angle. The tube is processed to the bending angle of the outer mold.

JP-A-8-309844

However, the conventional example having such a configuration has the following problems.
That is, the conventional apparatus has a problem that the pipe cannot be processed at an arbitrary angle because the bending angle of the pipe is fixed between the inner mold and the outer mold.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the pipe bending apparatus which can bend a pipe | tube by arbitrary bending amounts.

In order to achieve such an object, the present invention has the following configuration.
That is, the invention according to claim 1 is a pipe bending apparatus for bending a heated pipe, and holds the indicating means for instructing the bending amount and the pipe to be bent, A pair of chucks each holding two locations separated by a distance; a fulcrum member that contacts and supports the tube bending portion between the holding positions of the pair of chucks; and the bending portion A fulcrum member advancing / retreating means for advancing and retracting the fulcrum member over a processing position in contact with the bending portion, a pair of moving stages to which the pair of chucks are respectively attached, and the pair of moving stages Moving means for moving at least one of the pair of moving stages in a direction in which the pair of moving stages are close to each other, and the fulcrum member with respect to the tubes held by the pair of chucks Control means for moving the moving stage by driving the moving means according to the bending amount instructed by the instruction means while driving the retracting means to advance the fulcrum member, the fulcrum member and the chuck And an adjusting mechanism that adjusts the mounting direction of the moving stage and the chuck according to the positional relationship.

  [Operation / Effect] According to the invention described in claim 1, the control means drives the fulcrum member advancing / retreating means with respect to the pipe gripped by the pair of chucks to advance the fulcrum member to the bending portion. On the other hand, according to the bending amount instructed by the instruction means, the movement means is driven to move at least one of the movement stages in a direction in which the pair of movement stages approach each other. At this time, the mounting direction of the chuck holding the tube and the moving stage is adjusted by the adjusting mechanism, so that the tube is bent at the bending portion of the tube where the fulcrum member contacts. Therefore, the pipe can be bent with an arbitrary bending amount by changing the bending amount indicated by the indicating means.

  Further, in the present invention, the moving means includes a screw shaft disposed in a direction orthogonal to the advancing / retreating direction of the fulcrum member advancing / retreating means in a plan view, a motor that rotationally drives the screw shaft according to instructions from the control means, The pair of moving stages are attached to the screw shafts so as to move toward each other by the rotation of the screw shafts, and the adjusting mechanism is configured so that each of the pair of chucks is attached to each of the pair of moving stages. It is preferable that the rotary shaft is rotatably attached.

  When the motor is driven to rotate the screw shaft, the pair of moving stages move in a direction approaching each other, so that the both ends of the tube are bent so as to approach each other with the bending portion interposed therebetween. At this time, since each of the pair of chucks is rotatable with respect to the pair of moving stages by the rotation shaft, the direction of both ends of the tube is changed according to the bending amount as the fulcrum member advances and the pair of stages approaches. It can be moved naturally.

  In the present invention, it is preferable that the rotating shaft constituting the adjusting mechanism is attached to the moving stage with its axis oriented in a direction perpendicular to a plane including the bent tube. ).

  Since the direction of both ends of the tube accompanying the bending of the tube can be naturally moved according to the amount of bending, the direction of both ends in the bending of the tube can be made a natural shape.

  In the present invention, it is preferable that each of the pair of chucks is movable in the longitudinal direction of the tube with respect to each of the pair of moving stages.

  In processing the tube, the bending portion of the tube is heated, so that the tube extends in the longitudinal direction. Therefore, since the extension can be absorbed by the pair of chucks moving with respect to each of the pair of moving stages, the tube can be prevented from being deformed when the tube is heated.

  Further, in the present invention, the instruction means inputs a bending angle as a bending amount, and further includes a storage means for storing the bending angle and a moving distance of the moving means corresponding to the bending angle in advance. Preferably, the control means reads out the movement distance of the movement means corresponding to the bending angle instructed by the instruction means from the storage means, and operates the movement means in accordance with the movement distance. Item 5).

  By changing the bending angle as the bending amount stored in advance in the storage means, the pipe can be bent with various bending amounts.

  Moreover, in this invention, before the said fulcrum member advance / retreat means advances a fulcrum member, it is preferable to further provide the heating means which heats a pipe | tube in the said bending process part (Claim 6).

  Since the bending portion is heated by the heating means, a series of steps from heating the tube to bending can be performed with a single device. Therefore, the efficiency of pipe bending can be improved.

  According to the pipe bending apparatus according to the present invention, the control means drives the fulcrum member advancing / retreating means with respect to the pipe gripped by the pair of chucks, and advances the fulcrum member to the bending portion, while indicating means. In accordance with the bending amount instructed in (1), the moving means is driven to move at least one moving stage in a direction in which the pair of moving stages approach each other. At this time, the mounting direction of the chuck holding the tube and the moving stage is adjusted by the adjusting mechanism, so that the tube is bent at the bending portion of the tube where the fulcrum member contacts. Therefore, the pipe can be bent with an arbitrary bending amount by changing the bending amount indicated by the indicating means.

It is a perspective view which shows schematic structure of the pipe bending apparatus which concerns on an Example. It is a side view of a heating unit. It is a side view which shows the opening / closing mechanism of a heating head. It is a longitudinal cross-sectional view which shows the structure of the upper part of heated air piping. It is a block diagram of the pipe bending apparatus which concerns on an Example. It is a figure where it uses for description of the bending process of a pipe | tube. It is the top view which showed the state which arrange | positions the pipe | tube which is the object of a bending process. It is the top view which showed the state which clamped the pipe | tube. It is the top view which showed the state which heats the bending process part of a pipe | tube. It is the top view which showed the state which advanced the fulcrum part. It is the top view which showed the state which removed the pipe after bending.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view illustrating a schematic configuration of a pipe bending apparatus according to an embodiment.

  The tube bending apparatus according to this embodiment includes a chuck unit 1, a fulcrum unit 3, and a heating unit 5.

  The chuck unit 1 includes a pair of moving stages 7, a screw shaft 9, and a servo motor 11. The pair of moving stages 7 is attached to a linear guide (not shown) so as to be linearly movable, and is screwed to the screw shaft 9. One end of the screw shaft 9 is attached to the servo motor 11. When the servo motor 11 is driven, the screw shaft 9 is rotated, and the pair of moving stages 7 move in opposite directions. That is, when the servo motor 11 is driven so that the screw shaft 9 rotates on one side, the pair of chucks 7 approach each other, and when the servo motor 11 is driven so that the screw shaft 9 rotates on the other side, The moving stages 7 are separated from each other.

  In the pair of moving stages 7, a rotation base 13, a slide base 15, and a chuck base 17 are attached in that order from the bottom on the side opposite to the portion screwed with the screw shaft 9. The rotary base 13 is attached to a rotary shaft 19 attached to the moving stage 7 so as to freely rotate. The rotary shaft 19 is attached to the moving stage 7 with the axis P directed in a direction perpendicular to a plane including the tube 21 when the tube 21 is bent (see FIG. 10 described later). In addition, the pipe | tube 21 in a present Example is a product made from a fluororesin, for example, and is PFA (tetrafluoroethylene perfluoroalkyl vinyl ether copolymer) in more detail.

  The screw shaft 9 and the servo motor 11 described above correspond to the “moving means” in the present invention, and the rotating shaft 19 corresponds to the “adjusting mechanism” in the present invention.

  The slide base 15 is attached to the rotary base 13 so as to be movable in the longitudinal direction of the tube 21. A linear guide (not shown) is arranged on the upper surface of the rotation base 13 in a positional relationship parallel to the longitudinal direction of the tube 21. The slide base 15 is movably attached to the guide, and can move along the guide according to an external force. The chuck base 17 is attached to the upper part of the slide base 15.

  The chuck base 17 has the chuck 23 disposed on the upper surface. The chuck 23 includes a chuck portion 25 and an air cylinder 27. The chuck unit 25 includes a pair of chuck members 29. The pair of chuck members 29 includes a concave portion that accommodates the tube 21 near the center in the height direction, and one is fixed and the other is attached to the chuck base 17 so as to be movable with respect to the other. The movable chuck member 29 is attached to the piston rod of the air cylinder 27. When the piston rod of the air cylinder 27 is contracted, the movable chuck member 29 is separated from the fixed chuck member 29 to open the recess, and when the piston rod of the air cylinder 27 is extended, the movable chuck member is moved. 29 abuts against the fixed chuck member 29 to close the recess. The pair of chucks 23 grips the tube 21 and grips two locations separated by a predetermined distance longer than the length of a bent portion bp described later.

  The fulcrum unit 3 includes an air cylinder 31 and a fulcrum member 33. In the air cylinder 31, the side surface of the fulcrum member 33 is attached to the tip of the piston rod. The forward / backward direction of the piston rod of the air cylinder 31 is a direction orthogonal to a straight line connecting the pair of chucks 23. Further, the fulcrum member 33 is positioned at the same height as the height of the pipe 21 held by the pair of chucks 23. The fulcrum member 33 has a substantially circular outer shape in plan view. As will be described later, since the bending of the tube 21 is performed along the outer periphery of the fulcrum member 33, the outer diameter and shape of the fulcrum member 33 are the desired bending amount (bending radius, bending shape, etc.) of the tube 21. It is preferable to change according to. The fulcrum unit 3 is in a standby position in which the fulcrum member 33 is separated from the bending portion bp of the pipe 21 between the gripping positions by the pair of chucks 23 due to expansion and contraction of the piston rod of the air cylinder 31 (FIG. 1, FIG. 7 described later). 9 (refer to the positions in FIGS. 9 and 11) and the fulcrum member 33 is moved back and forth over the processing position (see the position in FIG. 10 described later) where the fulcrum member 33 is in contact with the bent portion bp. Note that the bent portion bp here refers to a portion of the straight tube 21 in a length range that is bent by the bending device.

  The air cylinder 31 described above corresponds to the “fulcrum member advance / retreat means” in the present invention.

  Here, the heating unit 5 will be described with reference to FIGS. 2 is a side view of the heating unit, FIG. 3 is a side view showing an opening / closing mechanism of the heating head, and FIG. 4 is a longitudinal sectional view showing the configuration of the upper part of the heated air pipe.

  The heating unit 5 includes a reciprocating mechanism 35, an elevating mechanism 37, a heating head 39, and an air heating unit 41. This heating unit 5 heats the bending part bp of the tube 21 to a heating temperature that softens the bending process to such an extent that it can be bent. The heated air is blown to the bent portion bp of the tube 21 and heated. The heating temperature varies depending on the type of material of the tube 21, but is about 310 ° C. in the case of a PFA tube, for example.

  The reciprocating mechanism 35 includes a linear moving unit 43 disposed along the longitudinal direction of the tube 21 held by the pair of chucks 23, and a servo motor 47 that drives the moving piece 45 along the linear moving unit 43. ing. When the servo motor 47 is driven, the moving piece 45 is driven forward and backward along the linear moving unit 43 according to the rotation direction.

  An attachment member 49 is connected to the operating piece 45. An air cylinder 51 is attached to the attachment member 49. A piston rod 53 is attached to the air cylinder 51 so as to advance and retract in the vertical direction. The air cylinder 51 has a heating position for heating the tube 21 (a height position indicated by a two-dot chain line in FIG. 2) and a separated position (a height indicated by a solid line in FIGS. 1 and 2) located below the tube 21. The heating head 39 is moved up and down.

  A lifting frame 55 is attached to the piston rod 53 of the air cylinder 51. The lifting frame 55 has a lower mounting shelf 57 attached to the lower side opposite to the air cylinder 51 and an upper mounting shelf 59 attached to the lower mounting shelf 57.

  An air heating unit 41 is attached to the lower mounting shelf 57. The air heating unit 41 takes in clean air from an air supply source (not shown) and heats the air to a predetermined temperature. The air heating unit 41 includes a heated air pipe 63 at the top. The heated air pipe 63 guides the heated air generated by the air heating unit 41 to the upper heating head 39.

  A heating head 39 is attached to the upper mounting shelf 59. The heating head 39 includes a pair of movable covers 65 that can be opened and closed. The length of the movable cover 65 in the longitudinal direction of the tube is shorter than the length of the bent portion bp of the tube 21. As shown in FIG. 4, the pair of movable covers 65 are formed into, for example, a shape in which a thin plate material is processed into a rectangular box shape and cut in half along a vertical plane along the longitudinal direction of the tube 21. A heating space is formed in the inside in a state where the cut surfaces are closed together. The pair of movable covers 65 are formed with cuts from the edges on the side surfaces in the longitudinal direction of the tube 21, and the cuts have an inner diameter larger than the outer diameter of the tube 21 with the pair of movable covers 65 closed. An insertion hole 67 is formed. The pair of movable covers 65 are opened at the upper end wider than the lower end so as to be V-shaped when opened when viewed from the axial direction of the tube 21. The pair of movable covers 65 is formed with an introduction port 69 communicating with the internal heating space at the bottom. A guide plate 71 is attached to the introduction port 69. In other words, the guide plate 71 is attached to the upper part of the heated air pipe 63. The guide plate 71 has a trapezoidal shape in which the lower side is shorter than the upper side when viewed in a longitudinal section, disperses the heated air supplied from below along the inner side wall of the movable cover 65, and surrounds the insertion hole 67. To guide the heated air evenly.

  Reference is now made to FIG. The heating head 39 is opened and closed by an opening / closing mechanism 73. The opening / closing mechanism 73 includes an air cylinder 75, a link mechanism 77, and an opening / closing drive gear 79. The air cylinder 75 is erected on the lower mounting shelf 57. The piston rod of the air cylinder 75 is connected to the lower end of the rod 81 of the link mechanism 77. The opening / closing drive gear 79 is attached to a pair of movable covers 65 with a fixed shaft. Specifically, the pair of movable covers 65 are disposed in a lower part of the surface in which the insertion holes 67 are formed in a posture in which the rotation axis is directed in the long axis direction of the tube 21, and a pair of screws are engaged with each other. A pair is attached to each side surface of the movable cover 65. The open / close drive gear 79 has a gear ratio of 1: 1. One end of the opening / closing drive gear 79 (on the side opposite to the air cylinder 51) has one end of a lever 83 attached to the rotating shaft. The other end side of the lever 83 is connected to the upper end of the rod 81. Therefore, when the piston rod of the air cylinder 75 is contracted, the rod 81 is lowered, and the other end side of the lever 83 is set to a horizontal posture substantially the same height as the one end side, and the opening / closing drive gear 79 is paired with each other. The pair of movable covers 65 are closed by rotating toward the center of the movable cover 65 (the state indicated by the solid lines in FIGS. 2 and 3). On the other hand, when the piston rod of the air cylinder 75 is extended, the rod 81 is raised, the other end side of the lever 83 is raised to a position higher than the one end side, and the open / close drive gear 79 is connected to the pair of movable covers 65. And the pair of movable covers 65 are opened (a state indicated by a two-dot chain line in FIGS. 2 and 3).

  The heating head 39 described above corresponds to the “heating means” in the present invention.

  Next, the control system will be described with reference to FIG. FIG. 5 is a block diagram of the pipe bending apparatus according to the embodiment, and FIG. 6 is a diagram for explaining the pipe bending process.

  The servo motors 11, 47, the air cylinders 27, 51, 75 and the air heating unit 41 are controlled by the control unit 85 in an integrated manner. The control unit 85 includes a CPU (not shown). A storage unit 87, an instruction unit 89, and a display unit 91 are connected to the control unit 85.

  The storage unit 87 uses the bending portion bp as a reference, a bending angle BA (see FIG. 6) as an angle formed by both ends of the pipe 21, a bending radius BR (see FIG. 6) in the bending portion bp, The movement amount of the corresponding pair of chucks 23 in the longitudinal direction (the movement amount of the moving stage 7 and the driving amount of the servo motor 11, see FIG. 10), and the length of the bending portion bp corresponding to the bending radius BR. The movement amount of the heating head 39 corresponding to (the drive amount of the servo motor 47) is stored in advance. Further, a setting value of the heating temperature in the air heating unit 41 corresponding to the pipe 21 may be stored.

  The instruction unit 89 includes, for example, a keyboard, a mouse, or a push button switch. For example, after the tube 21 is placed on the pair of chucks 23, the instruction unit 89 instructs the operator to close the pair of chucks 23, start the bending process, and the bending angle and the bending radius described above. Used for.

  The display unit 91 is, for example, a liquid crystal display device, and is used for display when the above-described bending angle BA or bending radius BR is selected or edited.

  The control unit 85 described above corresponds to the “control unit” in the present invention, the storage unit 87 corresponds to the “storage unit” in the present invention, and the instruction unit 89 corresponds to the “instruction unit” in the present invention.

  Next, the operation of the above-described tube bending apparatus will be described with reference to FIGS. 7 is a plan view showing a state in which a pipe to be bent is placed, FIG. 8 is a plan view showing a state in which the pipe is sandwiched, and FIG. 9 is a pipe bending process. FIG. 10 is a plan view showing a state where the fulcrum part is advanced, and FIG. 11 is a plan view showing a state where a bent tube is removed. It is. It is assumed that both the fulcrum member 33 and the heating head 39 are in the standby position before the bending process.

  As shown in FIG. 7, the operator first sets the tube 21 before bending into the apparatus. Specifically, in a state where the pair of chucks 23 are opened, both ends are placed on the pair of chucks 23 so that the bent portion bp of the tube 21 is positioned at the center. When the operator instructs gripping from the instruction unit 89, the tube 21 is gripped by the pair of chucks 23 as shown in FIG.

  Next, the operator instructs the bending angle BA and the bending radius BR as shown in FIG. At this time, the operator attaches a fulcrum member 33 having an outer diameter and shape corresponding to the input bending angle BA and bending radius BR to the air cylinder 31. Thereafter, the start of processing is instructed via the instruction unit 89. If the bending radius BR is always the same, only the bending angle BA may be indicated.

  Then, as shown in FIG. 9, the control unit 85 operates the air cylinder 51 to raise the heating head 39 with the movable cover 65 opened to the heating position, and operates the air cylinder 75 to operate the tube. 21, the movable cover 65 is closed. Further, the control unit 85 reads the movement distance of the heating head 39 corresponding to the bending radius BR from the storage unit 87 and drives the servo motor 47. At this time, it is preferable that the controller 85 reciprocates the heating head 39 within a range corresponding to the length of the bent portion bp. Moreover, it is preferable that the moving speed, the drive timing, etc. are set so that the range of the bending process part bp to be heated is heated uniformly. In this way, the heating head 39 having a shorter length than the bending portion bp is moved to heat the tube 21, so that an arbitrary range of the tube can be heated, and the bending range of the tube 21 is set to the bending angle BA and Various ranges can be set according to the bending radius BR and the like, and a range suitable for bending can be heated uniformly. At this time, the tube 21 expands in the longitudinal direction. However, since the pair of chucks 23 moves horizontally along with the slide base 15 in the outward direction, the expansion can be absorbed. Therefore, the collapse of the tube 21 due to heating can be prevented.

  When the heating process of the pipe 21 is completed, the control unit 85 operates the air cylinder 75 to open the movable cover 65 and then operates the air cylinder 51 to lower the heating head 39 to the standby position. The controller 85 operates the air cylinder 75 to close the movable cover 65 and suppress the temperature drop in the heating head 39.

  Next, as shown in FIG. 10, the control unit 85 operates the air cylinder 31 to advance the fulcrum member 333 to the machining position. At the same time, the control unit 85 operates the servo motor 11 to move the pair of moving stages 7 in a direction approaching each other to perform a bending process. The movement amount corresponds to the bending angle BA and the bending radius BR, and is read from the storage unit 87. When the fulcrum member 33 is advanced and the pair of moving stages 7 are moved, the tube 21 is bent so that the bent portion bp of the tube 21 is supported by the fulcrum member 33 and along the outer periphery of the fulcrum member 33. . At this time, a force acts so that both end sides of the tube 21 face the air cylinder 31 side with respect to the axis of the original tube 21. The force is absorbed by the pair of chucks 23 rotating around the axis P by the rotary shaft 19, and it is possible to prevent the end portions of the tube 21 held by the chuck 23 from being deformed.

  After finishing the bending process, the control unit 85 operates the air cylinder 27 to separate the pair of chuck members 29 and release the chuck 23 as shown in FIG. And an operator takes out the pipe | tube 21 which finished the bending process.

  The pipe 21 is bent by the pipe bending apparatus by the series of processes described above.

  According to the present embodiment, the control unit 85 drives the air cylinder 31 with respect to the pipe 21 held by the pair of chucks 23 to advance the fulcrum member 33 with respect to the bending portion bp, and the instruction unit 89 In accordance with the instructed bending angle BA and bending radius BR, the servo motor 11 is driven to move the pair of moving stages 7 in a direction in which the pair of moving stages 7 approach each other. At this time, since the mounting direction of the chuck 23 holding the tube 21 and the moving stage 7 is adjusted by the rotary shaft 19, the tube 21 is bent at the bending portion bp of the tube 21 where the fulcrum member 33 contacts. Therefore, the pipe 21 can be bent at an arbitrary bending angle BA and bending radius BR by changing the bending angle BA and bending radius BR indicated by the instruction unit 89.

  The present invention is not limited to the above embodiment, and can be modified as follows.

  (1) In the above-described embodiment, the pair of chucks 23 are moved together, but the present invention is not limited to such an embodiment. For example, depending on the amount of bending, the same bending process can be performed even if one chuck 23 is moved and the other chuck 23 is fixed.

  (2) In the above-described embodiment, the pair of chucks 23 is configured to be slidable in the longitudinal direction of the tube 21 by the slide base 15. For example, when the expansion of the tube 21 is extremely small, such a configuration is used. It is not necessary to have. Further, instead of the slide base 15 sliding on the moving stage 7 to escape the expansion, the servo motor 11 may be driven to move the moving stage 7 to release the expansion. Thereby, the structure of the chuck 23 can be simplified.

  (3) In the above-described embodiment, the slide base 15 is movable following the moving stage 7, but the present invention is not limited to such a configuration. For example, the slide base 15 may be fixed to the moving stage 7 with a spring, and the slide base 15 may be biased in the expansion direction with a predetermined pulling force. Further, the slide base 15 may be configured to be movable by a screw shaft and a motor provided on the moving stage 7 and arranged in the expansion direction of the tube 21. Further, the chuck 23 is attached to the moving stage 7 so as to be freely rotatable by the rotating base 13 and the rotating shaft 19, but the chuck 23 is actively attached to the moving stage 7 by a motor or the like according to the bending angle BA or the like. Alternatively, it may be rotationally driven.

  (4) In the above-described embodiment, the case where the bending angle BA and the bending radius BR are specified as the bending amount has been described as an example. However, when the bending radius BR is performed with a constant bending radius, the bending angle is used as the bending amount. Only BA may be specified. In this case, the operator does not need to replace and replace the fulcrum member 33 corresponding to the bending radius BR or the like. It is preferable to provide a mechanism that automatically replaces and replaces the fulcrum member 33.

  (5) In the Example mentioned above, although the pipe bending apparatus provided with the heating unit 5 is illustrated, the heating unit 5 is not essential for this invention. For example, after the bending part bp of the pipe 21 is heated by another apparatus, the pipe 21 may be bent by this apparatus.

  (6) In the above-described embodiment, the case where the PFA pipe 21 is bent is described as an example. However, the present invention is not limited to the PFA pipe 21. For example, the present invention can be applied to other fluororesin pipes 21 such as PTFE (polytetrafluoroethylene) and ETFE (ethylene / tetrafluoroethylene copolymer). Also, the resin pipe 21 other than the fluororesin can be applied.

  (7) In the above-described embodiment, the case where the bending portion bp is one place has been described as an example. However, the present invention includes a plurality of fulcrum units 3 and has a plurality of bending portions bp. Even if there is, it can be bent. Thereby, complicated bending processes, such as a S-shaped bending process, can also be given.

DESCRIPTION OF SYMBOLS 1 ... Chuck unit 3 ... Supporting point unit 5 ... Heating unit 7 ... Moving stage 9 ... Screw shaft 11, 47 ... Servo motor 13 ... Rotation base 15 ... Slide base 17 ... Chuck base 19 ... Rotation shaft 21 ... Pipe 23 ... Chuck 25 ... Chuck part 27, 31, 51, 75 ... Air cylinder 35 ... Reciprocating mechanism 37 ... Elevating mechanism 39 ... Heating head 65 ... Movable cover 68 ... Insertion hole 71 ... Guide plate 85 ... Control part 87 ... Storage part 89 ... Instruction part bp ... Bending part BA ... Bending angle BR ... Bending radius

Claims (6)

In a pipe bending apparatus for bending a heated pipe,
Instruction means for instructing the amount of bending;
A pair of chucks for gripping a pipe to be bent, each gripping two places separated by a predetermined distance;
A fulcrum member that contacts and supports the bending portion of the pipe between the gripping positions of the pair of chucks;
Fulcrum member advancing / retreating means for advancing and retracting the fulcrum member over a processing position that contacts the bending portion and a standby position spaced from the bending portion;
A pair of moving stages to which the pair of chucks are respectively attached;
Moving means for moving at least one of the pair of moving stages in a direction in which the pair of moving stages are close to each other;
The fulcrum member advancing / retreating means is driven with respect to the pipes gripped by the pair of chucks, and the fulcrum member is advanced to drive the moving means according to the bending amount indicated by the indicating means. Control means for moving the stage;
An adjustment mechanism for adjusting the mounting direction of the movable stage and the chuck according to the positional relationship between the fulcrum member and the chuck;
A pipe bending apparatus characterized by comprising: In the pipe bending apparatus according to claim 1,
The moving means is
A screw shaft disposed in a direction orthogonal to the advancing / retreating direction of the fulcrum member advancing / retreating means in plan view;
A motor that rotationally drives the screw shaft according to an instruction of the control means;
With
The pair of moving stages are attached to the screw shaft so as to move in a direction approaching each other by rotation of the screw shaft,
The tube bending apparatus according to claim 1, wherein the adjusting mechanism includes a rotating shaft that rotatably attaches each of the pair of chucks to each of the pair of moving stages. In the pipe bending apparatus according to claim 2,
The tube bending apparatus characterized in that the rotating shaft constituting the adjusting mechanism is attached to the moving stage with its axis oriented in a direction perpendicular to a plane including the bent tube. The pipe bending apparatus according to claim 2 or 3,
Each of the pair of chucks is capable of moving back and forth in the longitudinal direction of the pipe with respect to each of the pair of moving stages. In the pipe bending apparatus according to any one of claims 1 to 4,
The instruction means inputs a bending angle as a bending amount,
Storage means for storing in advance the bending angle and the moving distance of the moving means according to the bending angle;
The control means reads the movement distance of the moving means corresponding to the bending angle instructed by the instruction means from the storage means, and operates the moving means according to the movement distance. Processing equipment. In the pipe bending apparatus according to any one of claims 1 to 5,
The pipe bending apparatus further comprising heating means for heating the pipe in the bending section before the fulcrum member advance / retreat means advances the fulcrum member.

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