JP5681253B1 - Tube heat treatment equipment - Google Patents

Abstract

A heat treatment apparatus is provided that heats and dries while efficiently conveying and holding a pipe. In a heat treatment apparatus for heating and drying a pipe material P, a heating chamber 10 is provided above and a cooling chamber 11 is provided below, and an opening 12 through which the pipe material P passes is opened and closed between the heating chamber 10 and the cooling chamber 11. A furnace body 1 provided with a shutter 13 and provided with doors 7 for opening and closing an entrance 6 for loading and unloading the pipe material P into and out of the cooling chamber 11, and supports both ends of the pipe material P, and in a horizontal state, the furnace body 1 The raising / lowering mechanism 2 which raises / lowers the pipe material P between the heating chamber 10 and the cooling chamber 11, and the first rotating the pipe material P in a state where both ends of the pipe material P delivered in the heating chamber 10 are supported by the raising / lowering mechanism 2. The rotating mechanism 3 and the second rotating mechanism 4 that rotates the tube material P while supporting both ends of the tube material P delivered in the cooling chamber 11 by the elevating mechanism 2 are provided. [Selection] Figure 1

Description

  The present invention relates to a heat treatment apparatus for a pipe material, and more particularly, to a heat treatment apparatus for heating and drying a pipe material that does not like foreign objects coming into contact with an outer surface.

  Generally, when heat-treating a pipe material, the pipe material is transported in a furnace while being rolled on a support base or a support tool, or the pipe material is held at the lower part. For example, Patent Document 1 describes a continuous coating apparatus that transports a long shaped material such as a grooved steel in the longitudinal direction, but does not pipe, and performs coating and drying. Further, in Patent Document 2, a conveying path is configured by arranging a number of rollers having a rotation axis inclined with respect to the traveling direction of the steel pipe so as to have a downward gradient, and the steel pipe is arranged from the outer periphery on the conveying path. A heat treatment facility for a steel pipe is described in which an induction heater for heating, a holding furnace, and a cooling device using cooling water are arranged.

  However, for example, the pipe material immediately after coating has a coating film on the surface, and therefore the pipe material cannot be rolled or the lower part of the pipe material cannot be held. For this reason, it is conceivable that the pipe material immediately after coating is heat-treated in a self-standing manner. For example, as described in Patent Document 3, various work processes such as painting and drying can be performed by hanging a pipe member and transferring it along a rail using a hanger jig. However, when the tube material is long, the apparatus becomes very expensive, and there is a problem that it is difficult to convey and hold the tube material.

Japanese Patent Publication No. 63-1908 JP 2010-255031 A JP 11-51297 A

  Then, this invention makes it a subject to provide the heat processing apparatus which heats and dries while conveying and hold | maintaining the pipe material which dislikes that a foreign material contacts an outer surface efficiently.

As means for solving the above problems, the present invention provides:
In the heat treatment equipment that heats and dries the tube material,
A heating chamber is provided above, a cooling chamber is provided below, a shutter is provided between the heating chamber and the cooling chamber to open and close an opening through which the pipe passes, and an inlet / outlet for loading and unloading the pipe into the cooling chamber is provided. A furnace body provided with a door for opening and closing;
Are arranged respectively at one end and the other end of the tubing, and supporting both ends of the tube material, in a horizontal state, a lifting mechanism for raising and lowering said tubing between the cooling chamber and the heating chamber of the furnace body,
A first rotating mechanism for rotating said tube member while supporting both ends of the tubing which passed the heating chamber by the lifting mechanism,
It is obtained by a second rotating mechanism for rotating said tube member while supporting both ends of the tubing which passed the cooling chamber by the lifting mechanism.

  In the above-described configuration, the pipe material is inserted into the cooling chamber of the furnace body, transferred to the lifting mechanism descending into the cooling chamber, and supported at both ends in a horizontal state. The pipe material supported at both ends by the elevating mechanism moves up to the heating chamber, is transferred to the first rotation mechanism in the heating chamber, and is supported at both ends. The tube material supported at both ends by the first rotation mechanism is heat-treated while rotating in the heating chamber. The heat-treated tube material is transferred to an elevating mechanism that has been raised to the heating chamber, and both ends are supported. The pipe material supported at both ends by the elevating mechanism descends to the cooling chamber, is transferred to the second rotating mechanism in the cooling chamber, and is supported at both ends. The pipe material supported at both ends by the second rotation mechanism is cooled while rotating in the cooling chamber. The cooled tube material is carried out to the outside of the furnace body.

The elevating mechanism includes an elevating rod penetrating the furnace body and extending in the vertical direction, a support member provided at an upper end of the elevating rod and having a support surface for supporting the tube material on an upper surface, and an outer side of the furnace body It is preferable that the moving device is arranged and is configured to move the lifting rod in the axial direction.
According to this structure, the raising / lowering rod is moved up and down by the moving device, so that the pipe material supported at both ends by the support member can be transported between the cooling chamber and the heating chamber.

The support surface of the support member is preferably provided with an inclination that decreases in a direction from the end of the tube toward the center.
According to this configuration, both ends of the tube material can be received at points on the support surface, and contact with the outer surface of the tube material can be minimized.

It is preferable that the support surface has a stepped step portion in the axial direction of the pipe material.
According to this configuration, when both ends of the pipe material supported by the support surface of the support member are supported by the first rotation mechanism or the second rotation mechanism, the end of the pipe material abuts against the stepped portion when pressed from one side. Since it contacts, it can prevent that a pipe material falls from a support member. Further, when pulling out the first rotation mechanism or the second rotation mechanism from the tube material supported by the first rotation mechanism or the second rotation mechanism, the pipe material is pulled when pulled by the first rotation mechanism or the second rotation mechanism. Since the end of the tube contacts the step portion, it is possible to prevent the pipe material from falling off the support member without being received by the support surface of the support member.

It is preferable to include a measuring device that measures the amount of thermal expansion of the tube material and an adjusting device that adjusts the rising position of the support member according to the amount of thermal expansion measured by the measuring device.
According to this configuration, since the length of the pipe material is changed to be long due to the thermal expansion generated during the heat treatment of the pipe material, the contact point with the support surface of the elevating mechanism moves to the upper side of the support surface. For this reason, when the support member is raised by the elevating mechanism to receive the pipe material, if the pipe material is raised to the same position as when the pipe material is delivered, the support surface collides with the end of the pipe material. Therefore, the amount of thermal expansion of the tube material is measured by the measuring device, and the support surface can be prevented from colliding with the end of the tube material by adjusting the rising position of the support member according to the measured amount of thermal expansion. .

The elevating mechanism located on one end side of the tube material is composed of one elevating mechanism, and the elevating mechanism located on the other end side of the tube material is composed of a plurality of elevating mechanisms that can be selectively used according to the length of the tube material. It is preferable to become.
According to this structure, since the raising / lowering mechanism can be selected according to the length of the tube material, heat treatment can be performed regardless of whether the tube material is short or long.

The first rotation mechanism and the second rotation mechanism are arranged outside a furnace body, on a fixed side located on one end side of the tube material, and on a movable side located on the other end side of the tube material,
The first rotation mechanism and the second rotation mechanism are respectively
A movable table movable in the axial direction of the pipe material;
A rotary shaft that is rotatably supported by the movable table, extends horizontally through the furnace body, and a tip presses the end of the pipe material;
A rotation drive device provided on the movable table and configured to rotate the rotation shaft;
A translation device that moves the movable table in the axial direction of the pipe material;
It is preferable that the movable device on the movable side can be moved backward relative to the fixed device on the fixed side by thermal expansion of the pipe material.
According to this configuration, even if the pipe material expands due to thermal expansion during heat treatment of the pipe material, the movable side parallel movement device moves backward relative to the fixed side parallel movement device, so that the pipe material is bent due to thermal stress. There is no deformation, and the rotating mechanism is not damaged.

According to the present invention, the pipe material is transported in a state where both ends are supported by the elevating mechanism from being inserted into the furnace to being unloaded, and both ends are supported by the first rotating mechanism and the second rotating mechanism. In this state, it is heat-treated and cooled, so that it is heat-treated while being transported and held efficiently.
Moreover, since the pipe material is supported at both ends, it is not necessary to increase the height of the apparatus, and the pipe material can be easily conveyed and held.
Further, since the contact with the pipe material is limited to the end portion of the pipe material, the product yield of the pipe material is improved.

The longitudinal cross-sectional view of the heat processing apparatus by one Embodiment of this invention. The front view of the heat processing apparatus of FIG. FIG. 2 is a transverse sectional view of the heat treatment apparatus of FIG. 1. (A) is an enlarged view which shows the support state of the fixed side of a pipe material, (b) is a right view of (a). (A) is an enlarged view which shows the support state of the movable side of a pipe material, (b) is a left view of (a). The top view of a fixed side rotation mechanism. The top view of a movable side rotation mechanism. The control block diagram of the heat processing apparatus of FIG. The front view which shows the delivery condition from a raising / lowering mechanism to a rotation mechanism. The front view which shows the delivery condition from a rotating mechanism to a raising / lowering mechanism.

FIG. 1 shows a heat treatment apparatus according to an embodiment of the present invention. This heat treatment apparatus is a heat treatment apparatus that heats and dries a tube material P immediately after the outer surface is coated, that is, a particularly long tube material P that dislikes contact of foreign matter with the outer surface. The heat treatment apparatus includes a furnace body 1, an elevating mechanism 2 (2a, 2b), a first rotating mechanism 3 (3a, 3b), and a second rotating mechanism 4 (4a, 4b).
In FIG. 1, the front side of the paper surface of the heat treatment apparatus is referred to as a front surface, the back side is referred to as a back surface, and the upper side, the lower side, the left side, and the right side are referred to as an upper surface, a bottom surface, a left side surface, and a right side surface, respectively. In particular, the left side is the fixed side because it is the side that restrains the expansion due to the thermal expansion of the tube material, and the right side is the movable side because it is the side that allows the expansion due to the thermal expansion of the tube material P.

  The furnace body 1 is installed on the mount 5 and has a rectangular parallelepiped shape that is long in the horizontal direction. The furnace body 1 can be evacuated to a predetermined degree of vacuum by a vacuum device (not shown). As shown in FIG. 2, an entrance 6 is formed at the lower front of the furnace body 1 so that the pipe P can be loaded and unloaded in a horizontal state. A door 7 is slidably provided in the entrance 6 so as to be slidable in the vertical direction. The door 7 is driven by an air cylinder 8 so that the doorway 6 can be opened and closed, and is pressed against the furnace body 1 by a pressing mechanism (not shown).

  As shown in FIG. 3, a heating chamber 10 surrounded by a heat insulating wall 9 is provided above the furnace body 1, and a cooling chamber 11 is provided below the heating chamber 10. The inside of the heating chamber 10 can be heated by a heater (not shown). An opening 12 through which the pipe material P can pass in a horizontal state is formed in the bottom wall of the heating chamber 10, and a shutter 13 is slidably provided in the opening 12. The shutter 13 is driven by an air cylinder 14 so that the opening 12 can be opened and closed.

  The elevating mechanism 2 supports both ends of the pipe P and moves up and down between the heating chamber 10 and the cooling chamber 11 of the furnace body 1 in a horizontal state. The elevating mechanism 2a and four sets of elevating mechanisms 2b on the right side, that is, the movable side. The four movable lifting mechanisms 2b are provided at equal intervals along the longitudinal direction of the furnace body. The number of sets of movable lifting / lowering devices 2b is not limited to four, and may be determined according to the type of length of the pipe material P to be used. Each lifting mechanism 2 includes a lifting rod 15 that penetrates the bottom surface of the furnace body 1 and extends in the vertical direction. The elevating rod 15 is slidable in the vertical direction. The elevating rod 15 is inserted into the furnace from the bottom wall of the furnace body 1 via the shaft sealing member 16. A support member 17 is attached to the upper end of the lifting rod 15. The elevating rod 15 can be moved up and down by driving an arm 18 attached to the lower end by an air cylinder 19.

  As shown in FIGS. 4 and 5, the support member 17 of the lifting rod 1 has a support surface 20 that supports the end of the pipe P on the upper surface. The support surface 20 of the movable elevating mechanism 2b is formed longer in the axial direction of the tube material P than the support surface 20 of the fixed elevating mechanism 2a so that the support surface 20 can be supported even if the tube material P extends during heat treatment. As shown in FIG. 4A, the support surface 20 is provided with an inclination that decreases in the direction from the end of the pipe material P toward the center. The inclination angle θ is preferably 3 to 5 °. An intermediate step portion 21 having a step shape in the axial direction of the pipe material P is formed in the middle of the inclination direction of the movable support surface 20, and a first support surface 20 a is formed below the intermediate step portion 21, and the intermediate step A second support surface 20 b is formed above the portion 21. As shown in FIG. 4A, an upper step 22 is formed at the end of the fixed-side support surface 20 with the higher inclination. Similarly, as shown in FIG. 5A, an upper step 22 is formed at the higher end of the second support surface 20b of the movable support surface 20. Further, both the support surface 20 on the fixed side and the movable side are recessed along the outer peripheral surface of the tube material P so that the tube material P does not roll down. The concave shape of the support surface 20 may be U-shaped or V-shaped. The pipe end of the pipe member 20 contacts at one point in the case of the U shape, and contacts at two points in the case of the V shape.

The first rotating mechanism 3 is arranged outside the upper portion of the furnace body 1 and includes a left-side fixed first rotating mechanism 3a and a right-side movable first rotating mechanism 3b. The first rotating mechanism 3 rotates the pipe P while supporting both ends of the pipe P delivered in the heating chamber 10 by the elevating mechanism 2.
The second rotating mechanism 4 is disposed outside the lower portion of the furnace body 1 and includes a left-side fixed second rotating mechanism 4a and a right-side movable second rotating mechanism 4b. The second rotating mechanism 4 rotates the pipe P while supporting both ends of the pipe P delivered in the cooling chamber 11 by the lifting mechanism 2.

  FIG. 6 shows the fixed-side first rotation mechanism 3a. The fixed-side first rotation mechanism 3a includes a movable table 24 that can move in the axial direction of the pipe material P on the LM guide 23 provided on the gantry 5a (movable side is 5b). The movable base 24 is provided with a bearing 25, and a cylindrical rotating shaft 26 that extends through the left wall of the furnace body 1 and extends in the horizontal direction is rotatably supported by the bearing 25. A telescopic tube 27 is externally mounted on the rotary shaft 26, and one end of the telescopic tube 27 is detachably attached to the rotary shaft 26 via a shaft sealing member 27 a, and the other end of the telescopic tube 27 is fixed to the wall of the furnace body 1. Has been. A detection plate 29 for detecting the rotation angle of the rotation shaft 26 by an angle detection switch 28 provided on the movable base 24 is attached to the rotation shaft 26. A gear 30 is provided at the left end of the rotating shaft 26, and a tip adapter 31 inserted into the end of the pipe P to be processed is detachably attached to the right end.

  The tip adapter 31 has a base portion 32 that is larger than the outer diameter of the pipe material P to be processed and is capable of contacting the end of the pipe material P, and a tip portion that is smaller than the inner diameter of the pipe material P to be processed and can be inserted into the pipe material P. 33 and is attached to an end plate 34 that closes the tip of the rotary shaft 26 by bolts and nuts 35. A lower portion of the base portion 32 is cut out to form a cutout portion 36 in order to prevent interference with the support member 17 of the lifting mechanism 2. A shock-absorbing material 37 having heat resistance and elasticity is sandwiched between the base portion 32 and the tip portion 33, and a shock-absorbing material 38 having heat resistance and elasticity is attached to the outer peripheral surface of the tip portion excluding the lower portion. The tip adapter 31 can be replaced with one having a different diameter in accordance with the diameter of the pipe material P to be processed.

  A drive shaft 39 is rotatably disposed on the movable table 24 by a bearing 40 in parallel with the rotation shaft 26. The drive shaft 39 is provided with a gear 41 that meshes with the gear 30 of the rotary shaft 26. The drive shaft 39 is connected to a motor 42 disposed on the movable table 24. Further, the movable base 24 can move horizontally on the LM guide 23 by driving an arm 43 attached to the side end by an air cylinder 44. Further, the moving amount of the movable table 24 is detected by a moving amount detection switch 45 provided on the base plate 5 '.

  FIG. 7 shows the movable-side first rotation mechanism 3b, which is mirror-symmetrical with the fixed-side first rotation mechanism 3a, and the length of the base plate 5 ′ and the LM guide 23 is the base of the fixed-side first rotation mechanism 3a. Except for being longer than the length of the plate 5 ′ and the LM guide 23, the configuration is the same as that of the fixed-side first rotation mechanism 3 a. The pressure at the time of driving the air cylinder 44 of the movable side first rotating mechanism 3b is set to be smaller than the pressure at the time of driving the air cylinder 44 of the fixed side first rotating mechanism 3a. 44 can be retracted relative to the air cylinder 44 on the fixed side by thermal expansion of the pipe P to be heat-treated.

  The second rotating mechanism 4 has the same arrangement and configuration as the first rotating mechanism 3 except that the second rotating mechanism 4 is provided below the furnace body 1, that is, corresponding to the cooling chamber 11. A description thereof will be omitted.

  FIG. 8 illustrates the door opening / closing air cylinder 8, the shutter opening / closing air cylinder 14, the air cylinder 19 of the lifting mechanism on the fixed side and the movable side, the motor 42 and the air cylinder of the first rotating mechanism on the fixed side and the movable side. 44, a control device 46 such as a sequencer for controlling the motor 42 and the air cylinder 44 of the second rotating mechanism on the fixed side and the movable side.

  Next, the operation of the heat treatment apparatus for the pipe P having the above configuration will be described.

  First, the door opening / closing air cylinder 8 is driven to open the door 7 of the furnace body 1, and the pipe material P to be processed is inserted into the cooling chamber 11 through the entrance / exit 6 of the furnace body 1 by a transfer device (not shown). The support member 17 of the lifting rod 15 is raised to the receiving position of the pipe material P by the air cylinder 19 of the lifting mechanism on the fixed side and the movable side, and the inserted pipe material P is received on the support surface 20 of the support member 17. The plurality of movable lifting mechanisms 2b select the lifting mechanism 2b that can receive the pipe material P based on the length of the pipe material P to be processed. When the transfer device is retracted, the shutter 13 of the heating chamber 10 is opened by the shutter opening / closing air cylinder 14, and then the support member 17 of the lifting rod 15 that supports the pipe material P by the air cylinder 19 of the lifting mechanism 2 on the fixed side and the movable side. Is raised to a delivery position in the heating chamber 10 through the opening 12.

  As shown in FIG. 9A, the delivery position of the support member 17 of the lifting rod 15 is such that the center of the pipe P is lower than the axis of the rotation shaft 26 of the first rotation mechanism 3 on the fixed side and the movable side. It is determined in advance so that Since the support surface 20 of the support member 17 of the elevating rod 15 is inclined in the axial direction of the pipe material P, the pipe material P is supported at points by the pipe ends on both sides. For this reason, the support member 17 does not contact the coating of the outer surface of the pipe P. When the pipe P is received from the transport device, the fixed-side pipe end is about 5 mm inside (A in the figure) from the upper step 22 of the fixed-side support member 17a, and the movable-side pipe end is the movable-side support. It is preferable to receive it so that it is at a position (B in the figure) of about 15 mm from the inner end of the member 17b.

  As shown in FIG. 9B, the movable base 24 is moved by the air cylinder 44 of the first rotation mechanism 3 on the fixed side, and the rotary shaft 26a is moved toward the pipe end of the pipe P at a low speed by a predetermined distance. As a result, the tip tapered portion of the tip adapter 31a of the rotating shaft 26a enters the inside of the tube end of the tube material P, the left end of the tube material P is pushed while lifting one side of the tube material P, and the tube material P moves to the movable side. . Even if the pipe material P is pushed and moved, the movable side pipe end stops at the intermediate step portion 21 of the support member 17b of the movable side lifting rod 15, so that it does not fall off. The amount of movement of the rotating shaft 26a is such that the tip of the rotating shaft 26a does not contact the support member 17a of the lifting mechanism 2 and the tube end of the pipe P is at least 10 mm from the end of the support surface 20 of the support member 17a of the lifting rod 15. It should be located inside (C in the figure).

  Subsequently, as shown in FIG. 9C, the movable base 24 is moved by the air cylinder 44 of the movable first rotating mechanism 3, and the rotating shaft 26 b is moved toward the pipe end of the pipe material P at a low speed. Here, the air pressure of the air cylinder 44 of the first rotating mechanism 3b on the movable side is lower than the air pressure of the air cylinder 44 of the first rotating mechanism 3a on the fixed side (for example, 500 KPa on the fixed side, 400 KPa). As a result, the tip adapter 31b of the rotating shaft 26b enters the inside of the pipe end while lifting the pipe P and pushes the right end of the pipe P, so that the pipe P moves to the fixed side. As a result, the tip adapter 31a is completely inserted into the tube end on the fixed side of the tube material P, and the tip adapter 31b is completely inserted into the tube end on the movable side. The movement of the rotating shaft 26b stops in a state where the pressure is applied from both ends and is supported. At this time, the shock is mitigated by the buffer members 37 and 38 of the tip adapter 31.

When moving the rotation shaft 26 of the first rotation mechanism 3 on the fixed side and the movable side toward the tube end of the pipe material P, the rotation shaft 26 is rotated and the rotation angle is detected by the angle detection switch 28. Then, the rotation is stopped at a position where the notch 36 of the tip adapter 31 of the rotating shaft 26 is positioned downward. Thereby, interference with the support member 17 of the front-end | tip adapter 31 and the raising / lowering rod 15 is prevented.
Further, the movement amount detection switch 45 detects the movement amount in the axial direction from the initial position of the rotation shaft 26 of the first rotation mechanism 3 on the fixed side and the movable side. Then, the length of the pipe material P is calculated from the initial position and the moving amount of the rotating shaft 26, the calculated length of the pipe material P is compared with the length data of the pipe material P inputted in advance, and the calculated length of the pipe material P is constant. If it is within the range, it is determined that the first rotating mechanism 3 is correctly supported, the lifting rod 15 is lowered, the shutter 13 is closed, and the process proceeds to the heating step.

  In the heating process, the door 7 of the furnace body 1 is closed and the inside of the furnace is exhausted to a predetermined degree of vacuum by a vacuum device (not shown). And the motor 42 of the 1st rotation mechanism 3 is driven, the rotating shaft 26 is rotated, and the pipe material P in the heating chamber 10 is heated with the heater which is not shown in figure. The heated pipe P undergoes thermal expansion, but extends to the movable side due to the air pressure difference of the air cylinder 44. At this time, the rotating shaft 26 of the movable first rotating mechanism 3b moves backward relative to the rotating shaft 26 of the fixed first rotating mechanism 3a, so that the pipe material P is not bent due to thermal stress. The elongation δ of the tube material P can be detected by the movement amount detection switch 45 by the retraction amount of the rotation shaft 26 of the first rotation mechanism 3a on the fixed side.

When the heating process is completed, the shutter 13 is opened, and the support member 17 of the lifting rod 15 is raised to the delivery position in the heating chamber 10 by the air cylinder 19 of the lifting mechanism 2 on the fixed side and the movable side. This delivery position is a position where the fixed-side support member 17a substantially contacts the pipe end of the pipe P, as shown in FIG. Here, the delivery position of the support member 17b of the movable lifting rod 15 is set lower than the delivery position before heating. Since the pipe material P extends to the movable side by the heat treatment, the pipe end is located on the higher side of the inclined support surface 20 of the support member 17b, so that the support member 17b is located at the same position as the delivery position before heating. This is because when it rises, it collides with the pipe end. The stop position of the movable support member 17b is lowered by a height h calculated by the following equation.
[Equation 1]
h = x + δ tan θ
δ: Elongation of pipe P measured by detection switch 45
θ: inclination angle of the support surface 20
x: height of the intermediate step 21

  As shown in FIG. 10B, the movable base 24 is moved by the air cylinder 44 of the movable first rotating mechanism 3b, and the rotating shaft 26b is pulled out from the pipe end of the pipe P. Thereby, the tip adapter 31b of the rotating shaft 26b is detached from the pipe end of the pipe P. At this time, even if the pipe P is pulled and moved to the movable side, the movable side pipe end stops at the upper step portion 22 of the support member 17b of the movable side lifting rod 15.

Subsequently, as shown in FIG. 10C, the movable base 24 is moved by the air cylinder 44 of the fixed first rotation mechanism 3 a, and the rotation shaft 26 a is pulled out from the tube end of the tube material P. Thereby, the tip adapter 31a of the rotating shaft 26a is detached from the pipe end of the pipe P. At this time, even if the pipe P is pulled and moved to the fixed side, the fixed-side pipe end stops at the upper step portion 22 of the support member 17a of the fixed-side lifting rod 15.
As described above, both ends of the pipe material P are supported by the support surface 20 of the support member 17.

  Next, the support member 17 of the elevating rod 15 that supports the heat-treated pipe P is lowered to the delivery position in the cooling chamber 11 by the air cylinder 19 of the elevating mechanism 2 on the fixed side and the movable side, and the shutter 13 is closed. The delivery position of the support member 17 of the elevating rod 15 is determined in advance so that the center of the pipe P is lower than the axis of the rotation shaft 26 of the first rotation mechanism 3 on the fixed side and the movable side.

  The transfer operation of the pipe P from the support member 17 of the lifting rod 15 before cooling to the second rotation mechanism 4 in the cooling chamber 11 and the transfer operation from the second rotation mechanism 4 after cooling to the support member 17 of the lifting rod 15 are as follows. This is the same as the delivery operation in the heating chamber 10 described above. However, the delivery position of the support member 17 of the movable lifting rod 15 after cooling is set higher than the delivery position before cooling. Also in this case, the amount of contraction due to the thermal contraction of the pipe material P is detected, and the delivery position is increased by the height h calculated by the above equation 1.

  In the cooling process, the motor 42 of the second rotating mechanism 4 is driven to rotate the rotating shaft 26 and cool the tube material P in the cooling chamber 11. When the cooling process is completed, the support member 17 of the lifting rod 15 that supports the cooled pipe P is lowered to the same position as the receiving position in the cooling chamber 11 by the air cylinder 19 of the lifting mechanism 2 on the fixed side and the movable side. Then, the door 7 is opened, and the cooled pipe material P is carried out from the cooling chamber 11 of the furnace body 1 by a transfer device (not shown), and the door 7 is closed.

  In the above embodiment, the tip adapter 31 of the first and second rotating mechanisms 3 and 4 is inserted into the pipe end. However, the tip adapter 31 is arranged in the circumferential direction like a mandrel chuck (inner circumference clamp). A plurality of the divided pieces may be provided so as to be movable in the radial direction so that the diameter can be enlarged or reduced. In this way, it is not necessary to replace the tip adapter according to the diameter of the pipe material P.

DESCRIPTION OF SYMBOLS 1 Furnace 2 Elevating mechanism 3 1st rotation mechanism 4 2nd rotation mechanism 5 Base 5 'Base board 6 Doorway 7 Door 8 Air cylinder 9 Heat insulation wall 10 Heating chamber 11 Cooling chamber 12 Opening part 13 Shutter 14 Air cylinder 15 Lifting rod 16 Shaft seal member 17 Support member 18 Arm 19 Air cylinder 20 Support surface 21 Intermediate step portion 22 Upper step portion 23 LM guide 24 Movable stand 25 Bearing 26 Rotating shaft 27 Telescopic tube 28 Angle detection switch 29 Detection plate 30 Gear 31 Tip adapter 32 Base 33 Tip portion 34 End plate 35 Bolt nut 36 Notch portion 37 Buffer material 38 Buffer material 39 Drive shaft 40 Bearing 41 Gear 42 Motor (rotary drive device)
43 Arm 44 Air cylinder (translation device)
45 Movement amount detection switch (movement amount measuring device)
46 Control device (adjustment device)
P pipe material

Claims (7)

In the heat treatment equipment that heats and dries the tube material,
A heating chamber is provided above, a cooling chamber is provided below, a shutter is provided between the heating chamber and the cooling chamber to open and close an opening through which the pipe passes, and an inlet / outlet for loading and unloading the pipe into the cooling chamber is provided. A furnace body provided with a door for opening and closing;
Are arranged respectively at one end and the other end of the tubing, and supporting both ends of the tube material, in a horizontal state, a lifting mechanism for raising and lowering said tubing between the cooling chamber and the heating chamber of the furnace body,
A first rotating mechanism for rotating said tube member while supporting both ends of the tubing which passed the heating chamber by the lifting mechanism,
The heat treatment apparatus of a tube material and a second rotating mechanism for rotating said tube member while supporting both ends of the tubing which passed the cooling chamber by the lifting mechanism. The lifting mechanism is
A lifting rod extending through the furnace body in the vertical direction;
A support member provided at an upper end of the lifting rod and having a support surface for supporting the pipe material on an upper surface;
The pipe heat treatment apparatus according to claim 1, further comprising a moving device that is disposed outside the furnace body and moves the lifting rod in an axial direction.   The heat treatment apparatus for a pipe material according to claim 2, wherein the support surface of the support member is provided with an inclination that decreases in a direction from the end of the pipe material toward the center.   The heat treatment apparatus for a pipe material according to claim 3, wherein the support surface is formed with a stepped step portion in an axial direction of the pipe material. A measuring device for measuring the amount of thermal expansion of the pipe material;
The pipe heat treatment apparatus according to claim 3 , further comprising an adjustment device that adjusts a rising position of the support member according to a thermal expansion amount measured by the measurement device.   The elevating mechanism located on one end side of the tube material is composed of one elevating mechanism, and the elevating mechanism located on the other end side of the tube material is composed of a plurality of elevating mechanisms that can be selectively used according to the length of the tube material. The pipe heat treatment apparatus according to claim 1, wherein the heat treatment apparatus is a pipe material heat treatment apparatus. The first rotation mechanism and the second rotation mechanism are arranged outside a furnace body, on a fixed side located on one end side of the tube material, and on a movable side located on the other end side of the tube material,
The first rotation mechanism and the second rotation mechanism are respectively
A movable table movable in the axial direction of the pipe material;
A rotary shaft that is rotatably supported by the movable table, extends horizontally through the furnace body, and a tip presses the end of the pipe material;
A rotation drive device provided on the movable table and configured to rotate the rotation shaft;
A translation device that moves the movable table in the axial direction of the pipe material;
7. The movable device on the movable side can be retracted relative to the parallel device on the fixed side by thermal expansion of the pipe material. Tube heat treatment equipment.

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