JP5483552B2 - Roller hearth kiln and roller driven end connecting member - Google Patents

Description

  The present invention relates to a roller hearth kiln that conveys an object to be processed by a rotating roller, and a roller driven end connecting member attached to the roller.

  FIG. 9A shows a schematic top view of a conventional roller hearth kiln that conveys an object to be processed in an ideal conveyance state. FIG. 9B shows a schematic top view of a conventional roller hearth kiln that conveys the workpiece in the actual conveyance state.

  As shown in FIGS. 9A and 9B, the roller hearth kiln 100 includes a large number of rollers 101. Many rollers 101 are arranged along the conveyance direction (left-right direction) of the to-be-processed object 110. FIG. Each of the large number of rollers 101 can rotate about its own axis. The workpiece 110 is successively transferred from the upstream (left side) roller 101 to the downstream (right side) roller 101 so that the workpiece 110 is conveyed in the furnace. That is, the workpiece 110 is transported by a large number of rollers 101 along a transport path that continues from the loading section A100 to the heat treatment section A101 to the unloading section A102.

  In order to rotate the roller 101 about the axis, it is necessary to apply a driving force to the roller 101. In addition, it is necessary to rotatably support the roller 101. For this reason, both ends in the axial direction (front-rear direction) of the roller 101 protrude from the housing of the roller hearth kiln 100 to the outside.

  FIG. 10 is a perspective view of a conventional roller hearth roller. FIG. 11 shows a cross-sectional view in the XX direction of FIG. 10 and 11, the gap C100 defined between the roller 101 and the drive end cap 102 is shown with emphasis. As shown in FIGS. 10 and 11, the driving end (front end) of the roller 101 is accommodated in a cylindrical driving end cap 102. The driven end (rear end) of the roller 101 is rotatably supported by a pair of left and right tires 104. The roller 101 has a cylindrical shape (straight tubular shape) with the same diameter and the same diameter from the driving end to the driven end.

  The roller 101 is attached to the drive end cap 102 so as not to idle. A sprocket 103 is attached to the front end of the drive end cap 102. A driving force from a motor (not shown) is transmitted to the sprocket 103 via a chain (not shown). The driving force causes the roller 101 to rotate about the axis on the pair of left and right tires 104.

  Hereinafter, in the arrangement direction of the workpiece 110, the left-right direction is referred to as "row" and the front-rear direction is referred to as "column". In FIG. 9A and FIG. 9B, for the convenience of explanation, the workpieces 110 are hatched for each column.

  As shown in FIGS. 9A and 9B, a large number of workpieces 110 are mounted on a large number of rollers 101 in a relatively dense arrangement in order to increase the efficiency of heat treatment. . That is, a large number of objects to be processed 110 are conveyed in a state of being arranged in three rows.

  When heat treatment is performed on the workpiece 110, the roller 101 is also heated. For this reason, the roller 101 thermally expands in the radial direction. Therefore, as shown in FIG. 11, a gap C100 is defined between the outer peripheral surface of the driving end of the roller 101 and the inner peripheral surface of the driving end cap 102 in order to secure a thermal expansion space of the roller 101. ing.

JP-A-5-215466

  However, when the gap C100 is defined, when the roller 101 rotates, as shown in FIG. 11, the central axis B101 of the roller 101 deviates in the radial direction at the driving end with respect to the rotation axis B100 of the roller 101. . Therefore, as shown by the alternate long and short dash line in FIG. 11, the driving end is easily rattled in the driving end cap 102.

  On the other hand, as shown in FIG. 10, the driven end of the roller 101 is merely placed on the pair of left and right tires 104. For this reason, at the driven end, the central axis does not shake in the radial direction with respect to the rotation axis. Therefore, the driven end does not rattle.

  FIG. 12 shows a schematic perspective view of the roller in a rotating state. The amount of rattling of the driving end is regulated by the inner peripheral surface of the driving end cap 102. Therefore, as shown in FIG. 12, the rotation state of the roller 101 is as if the driving end has a radius R100 (= radius of the inner peripheral surface of the driving end cap 102) and a radius R101 (= radius R of the outer peripheral surface of the roller). A tapered roller 101 having a driven end is rotating. In this case, the circumferential movement amount of the drive end is larger than the circumferential movement amount of the driven end. Therefore, in the actual conveyance state shown in FIG. 9B, the workpieces 110 in the row closer to the driving end are closer to the driven end in the actual conveyance state shown in FIG. 9A. It is conveyed faster than the object 110 to be processed. Therefore, the heat treatment time varies between the workpiece 110 on the driving end side and the workpiece 110 on the driven end side. For example, if the heat treatment time of the workpiece 110 on the driving end side is adjusted to a predetermined heat treatment time, the heat treatment time of the workpiece 110 on the driven end side becomes long.

  Further, in the actual conveyance state shown in FIG. 9B, in contrast to the ideal conveyance state shown in FIG. 9A, the column width W100 of the three workpieces 110 belonging to the same column on the downstream side. It spreads. When the column width W100 is widened, when the workpieces 110 are dispensed from the heat treatment section A101 to the unloading section A102, it becomes difficult to dispense the workpieces 110 by dividing each column.

  In this regard, Patent Document 1 discloses a roller hearthkin in which a connecting pipe and a universal joint are interposed between a driving end of a roller and a sprocket driving shaft member. As shown in [0014] and [FIG. 2] of the document, the driving end of the roller is inserted into one end of the connecting pipe. The other end of the connection pipe is connected to the sprocket drive shaft member via a universal joint. According to the roller hearth kiln described in this document, it is possible to allow the connecting pipe to be bent with respect to the sprocket drive shaft member. However, rattling of the driving end of the roller with respect to the connecting pipe cannot be suppressed.

  The roller hearth kiln and roller driven end connecting member of the present invention have been completed in view of the above problems. SUMMARY OF THE INVENTION An object of the present invention is to provide a roller hearth kiln and a roller driven end connecting member capable of suppressing variations in the conveyance speed of an object to be processed.

  (1) In order to solve the above-described problems, the roller hearth kiln of the present invention includes a driving end to which a driving force is transmitted, a driven end disposed on the opposite side of the driving end in the axial direction, and a shaft around the driving end. A rotating shaft that is a center of rotation when rotating in an axial direction, and a central axis that is arranged at the center in the radial direction and extends in the axial direction from the driving end to the driven end, and has the same diameter to convey the workpiece A roller driving end connecting member attached to the driving end so that the driving shaft transmits the driving force to the driving end and the central axis deviates from the rotation shaft at the driving end, and the driven end. A roller driven end connecting member to which the driven end is attached so that the central axis is eccentric with respect to the rotating shaft, and the workpiece is conveyed by rotating the roller. (Corresponding to claim 1). Here, “the same diameter” means that the diameter of the roller is constant from the driving end to the driven end.

  The roller hearth kiln of the present invention includes at least one roller assembly. The roller assembly includes a roller, a roller driving end connecting member, and a roller driven end connecting member. The roller driving end connecting member transmits driving force to the driving end of the roller. The roller driving end connecting member is attached to the driving end of the roller. At the driving end, the central axis is displaced with respect to the rotation axis. That is, the central axis is displaced in the radial direction with respect to the rotation axis.

  On the other hand, the roller driven end connecting member is attached to the driven end of the roller. When the driven end connecting member is attached to the roller, the central axis can be decentered with respect to the rotation axis at the driven end of the roller. That is, the central axis can be shifted in the radial direction with respect to the rotation axis. For this reason, the rotational state of the driven end can be approximated to the rotational state of the driving end of the roller 101 shown in FIG. Therefore, the dispersion | variation in the conveyance speed of a to-be-processed object can be suppressed.

  Moreover, the dispersion | variation in the conveyance speed of a to-be-processed object can be suppressed only by attaching a roller driven end connection member to the driven end of the roller of the existing roller hearth kiln.

  Here, in order to suppress variation in the conveyance speed of the workpiece, it is conceivable that the rotation axis and the central axis coincide with each other at the driving end of the roller. However, in this case, the alignment accuracy between the driving end of the roller and the driving end connecting member is required.

  For example, in the case of the driving end of the roller 101 and the driving end cap 102 shown in FIGS. 10 and 11, it is necessary to make the gap C100 as small as possible. For this reason, high component accuracy is required. Therefore, the cost is increased. In particular, when the roller is made of ceramics, it is difficult to ensure high component accuracy.

  Moreover, since the workpiece is heated, the gap C100 is indispensable in consideration of the thermal expansion of the roller. Therefore, it is difficult to make the rotation axis coincide with the central axis at the driving end of the roller.

  On the other hand, the roller hearth kiln of the present invention shifts the rotation axis and the center axis at the driven end instead of making the rotation axis and the center axis coincide at the drive end. As described above, the roller hearth kiln according to the present invention allows the speed-up factor (variation factor) of the conveyance speed of the workpiece to be at the driving end of the roller, while also allowing the speed-up of the conveyance speed at the driven end. Is added to suppress variations in the conveyance speed.

  (1-1) Preferably, in the configuration of (1), the roller is preferably made of ceramics. When the roller is made of metal (this case is of course included in the configuration of (1)), the processability of the roller is high. For this reason, it is easy to make the shape of a roller into a desired taper shape so that the conveyance speed is unlikely to vary. On the other hand, when the roller is made of ceramics, the processability of the roller is low. For this reason, it is difficult to form the roller in a desired taper shape. Thus, when the processability of the roller is low, the roller driven end connecting member of the roller hearth kiln of the present invention is particularly effective.

  (2) Preferably, in the configuration of (1), the roller driven end connecting member is rotatably supported by a rolling element, and has a supported portion having an arc-shaped outer peripheral surface centered on the rotation shaft; It is better to have a configuration including a driven end receiving chamber disposed radially inside the outer peripheral surface, in which the driven end is received, and having an arcuate inner peripheral surface centered on the central axis. 2). According to this configuration, the rotational axis and the central axis can be shifted at the driven end only by storing the driven end in the driven end receiving chamber.

  (3) Preferably, in the configuration of the above (1) or (2), the roller driving end coupling member houses the driving end and has a circular arc-shaped inner peripheral surface centering on the rotating shaft. It is preferable to provide a storage chamber and to have a gap defined between the outer peripheral surface of the drive end and the inner peripheral surface of the drive end storage chamber (corresponding to claim 3).

  According to this configuration, the drive end accommodation chamber rotates around the rotation axis. However, a gap is defined between the outer peripheral surface of the drive end and the inner peripheral surface of the drive end accommodation chamber. For this reason, at the driving end, the central axis is displaced with respect to the rotation axis. In this regard, according to the roller hearth kiln of the present invention, the rotation axis and the center axis can be shifted at the driven end. For this reason, the dispersion | variation in the conveyance speed of a to-be-processed object can be suppressed. Thus, the roller hearth kiln of the present invention is particularly suitable for being embodied as a roller hearth kiln having the drive end mounting structure as in the present configuration.

(4) Moreover, in order to solve the said subject, the roller driven end connection member of this invention is a roller attached to this driven end of the roller of the same diameter which has a drive end, a driven end, a rotating shaft, and a center axis | shaft. A driven end connecting member, wherein the roller conveys an object to be processed in a roller hearth kiln, and the driven end of the roller is disposed on the opposite side of the driving end of the roller in the axial direction; The rotation axis is a rotation center when the roller rotates around the axis by the driving force transmitted to the driving end of the roller, and the central axis of the roller is disposed at the radial center of the roller, The roller extends in the axial direction from the driving end of the roller to the driven end of the roller, and at the driving end of the roller, the central axis of the roller is deviated from the rotation axis of the roller. And at the driven end of the roller, the rotating shaft of the roller To, and wherein the holding by decentering the central axis of the roller (corresponding to claim 4). Here, “the same diameter” means that the diameter of the roller is constant from the driving end to the driven end.

  The roller driven end connecting member of the present invention can be used for devices other than the roller hearth kiln separately from the configurations (1) to (3). According to the roller driven end connecting member of the present invention, as described in (1) above, the rotational state of the driven end can be approximated to the rotational state of the drive end. Therefore, variation in the conveyance speed of the object to be conveyed can be suppressed. Moreover, the dispersion | variation in the conveyance speed of a to-be-conveyed object can be suppressed only by attaching the roller driven end connection member of this invention to the driven end of the roller of the existing roller conveyor.

  (4-1) Preferably, in the configuration of (4) above, the roller is preferably made of ceramics. When the roller is made of metal (this case is of course included in the configuration of (4)), the processability of the roller is high. For this reason, it is easy to make the shape of a roller into a desired taper shape so that the conveyance speed is unlikely to vary. On the other hand, when the roller is made of ceramics, the processability of the roller is low. For this reason, it is difficult to form the roller in a desired taper shape. Thus, when the processability of the roller is low, the roller driven end connecting member of the roller hearth kiln of the present invention is particularly effective.

  (5) Preferably, in the configuration of (4) above, a supported portion that is rotatably supported by the rolling element and has an arc-shaped outer peripheral surface centered on the rotation axis, and a radially inner side of the outer peripheral surface And a driven end receiving chamber that has an arcuate inner peripheral surface centered on the central axis and is arranged to accommodate the driven end (corresponding to claim 5). According to this configuration, the rotational axis and the central axis can be shifted at the driven end only by storing the driven end in the driven end receiving chamber.

  ADVANTAGE OF THE INVENTION According to this invention, the roller hearth kiln and the roller driven end connection member which can suppress the dispersion | variation in the conveyance speed of a to-be-processed object can be provided.

It is a perspective view of a part in the longitudinal direction of the roller hearth kiln of the first embodiment. It is the II-II direction sectional drawing of FIG. FIG. 3 is an enlarged view in a frame III in FIG. 2. It is an expansion perspective view near the rear end of the roller assembly of the same roller hearth kiln. (A) is the VV direction sectional drawing of FIG. (B) is the VV direction sectional drawing of FIG. 4 when a roller rotates 180 degrees. It is a model top view of the same roller hearth kiln. It is a model perspective view of the roller of the rotation state of the same roller hearth kiln. It is an expansion perspective view near the rear end of the roller assembly of the roller hearth kiln of the second embodiment. (A) is a model top view of the conventional roller hearth kiln which conveys a to-be-processed object in an ideal conveyance state. (B) is a model top view of the conventional roller hearth kiln which conveys a to-be-processed object in an actual conveyance state. It is a perspective view of the roller of the conventional roller hearth kiln. It is XX direction sectional drawing of FIG. It is a model perspective view of the roller of the rotation state of the conventional roller hearth kiln.

  Hereinafter, embodiments of the roller hearth kiln of the present invention will be described. In addition, the following description serves as description of the roller driven end connection member of this invention.

<First embodiment>
[Composition of Laura Heartilkin]
First, the configuration of the roller hearth kiln according to the present embodiment will be described. FIG. 1 shows a perspective view of a part of the roller hearth kiln of the present embodiment in the longitudinal direction (left-right direction). FIG. 2 shows a cross-sectional view in the II-II direction of FIG.

  As shown in FIGS. 1 and 2, the roller hearth kiln 1 includes a housing 2, a large number of roller assemblies 3, and a large number of heaters 4. The left side of the roller hearth kiln 1 corresponds to the upstream side (loading side). The right side of the roller hearth kiln 1 corresponds to the downstream side (the carry-out side).

(Housing 2)
The housing 2 includes a housing body 20, a heat treatment chamber 21, a large number of roller insertion holes 22, a large number of heater insertion holes 23, a drive side bracket 24, and a driven side bracket 25.

  The housing body 20 includes an outer wall 200 and a heat insulating material 201. The outer wall 200 is made of stainless steel (SUS) and has a thin rectangular tube shape. The outer wall 200 extends in the left-right direction. The heat insulating material 201 is made of ceramic fiber or refractory brick, and has a thick square tube shape. The heat insulating material 201 is disposed inside the outer wall 200. The heat treatment chamber 21 is partitioned inside the heat insulating material 201.

  A large number of roller insertion holes 22 are arranged in the vicinity of the center in the vertical direction of both front and rear walls of the housing body 20. The roller insertion hole 22 communicates the heat treatment chamber 21 with the outside of the housing body 20. The large number of roller insertion holes 22 are arranged at predetermined intervals in the left-right direction. The roller insertion hole 22 on the front wall and the roller insertion hole 22 on the rear wall face each other in the front-rear direction.

  A number of heater insertion holes 23 are arranged in two upper and lower stages on both front and rear walls of the housing body 20 with the roller insertion holes 22 interposed therebetween. The heater insertion hole 23 communicates the heat treatment chamber 21 and the outside of the housing body 20. The large number of heater insertion holes 23 are arranged at predetermined intervals in the left-right direction. Further, the heater insertion hole 23 on the front wall and the heater insertion hole 23 on the rear wall face each other in the front-rear direction.

  The drive side bracket 24 is made of SUS and has an L shape. The drive side bracket 24 is disposed on the front wall of the housing body 20. The drive side bracket 24 includes a large number of bearing portions 240. The large number of bearing portions 240 are disposed on the front surface of the standing wall portion of the drive side bracket 24. The large number of bearing portions 240 are arranged at predetermined intervals in the left-right direction.

  The driven side bracket 25 is made of SUS and has an L shape. The driven bracket 25 is disposed on the rear wall of the housing body 20. The driven side bracket 25 includes a large number of tires 250. The tire 250 is included in the rolling element of the present invention. Many tires 250 are arranged on the rear surface of the standing wall portion of the driven bracket 25. A large number of tires 250 are arranged at predetermined intervals in the left-right direction.

(Heater 4)
The heater 4 is an electric heater. The heater 4 is made of silicon carbide (SiC) and has a cylindrical shape extending in the front-rear direction. A large number of heaters 4 are arranged in the heat treatment chamber 21 side by side in the left-right direction. A large number of heaters 4 are arranged in two upper and lower stages with a roller 30 described later interposed therebetween. Both ends of the heater 4 in the front-rear direction protrude from the heat treatment chamber 21 to the outside of the housing body 20 through the heater insertion holes 23, respectively. The heater 4 is electrically connected to an external power source (not shown).

(Roller assembly 3)
The roller assembly 3 includes a roller 30, a driving end cap 31, and a driven end cap 32. The drive end cap 31 is included in the roller drive end connecting member of the present invention. The driven end cap 32 is included in the roller driven end connecting member of the present invention.

  The roller 30 is made of mullite and has a cylindrical shape with the same diameter over the entire length in the axial direction. The roller 30 extends in the front-rear direction. A large number of rollers 30 are arranged in the heat treatment chamber 21 side by side in the left-right direction. The front end and the rear end of the roller 30 protrude from the heat treatment chamber 21 to the outside of the housing main body 20 through the roller insertion hole 22, respectively. The front end of the roller 30 is included in the drive end of the present invention. The rear end of the roller 30 is included in the driven end of the present invention.

  FIG. 3 shows an enlarged view in the frame III of FIG. As shown in FIG. 3, the drive end cap 31 is attached to the front end 300 of the roller 30. The drive end cap 31 includes a cap body 310, a pair of spring members 311, a drive end accommodation chamber 312, and a drive shaft member accommodation chamber 313.

  The cap body 310 has a cylindrical shape. A pair of recesses 310 a and a pair of spring member insertion holes 310 b are disposed on the outer peripheral surface of the cap body 310. The pair of recesses 310 a is disposed near the front end of the cap body 310. The recess 310a is recessed in the outer peripheral surface. The pair of recesses 310a are arranged to face each other by 180 °. The pair of spring member insertion holes 310b are disposed near the rear end of the cap body 310. The spring member insertion hole 310b penetrates the cap body 310 in the radial direction. The pair of spring member insertion holes 310b are arranged to face each other by 180 °. A pair of spring member insertion holes 300b drilled in the front end 300 are connected to the inside in the radial direction of the pair of spring member insertion holes 310b. The recess 310a and the spring member insertion hole 310b are arranged in the front-rear direction.

  The drive end accommodation chamber 312 is disposed on the radially inner side of the cap body 310. The drive end accommodation chamber 312 is disposed in the rear portion of the cap body 310. The driving end storage chamber 312 stores the front end 300 of the roller 30. The drive end accommodating chamber 312 has an arcuate inner peripheral surface centered on the rotation axis B1 of the roller 30 (the rotation axis B1 is determined by the drive end cap 31 and the driven end cap 32). . The radius of the inner peripheral surface of the drive end accommodating chamber 312 is larger than the radius of the outer peripheral surface of the roller 30. For this reason, a gap is defined between the outer peripheral surface of the front end 300 and the inner peripheral surface of the drive end accommodating chamber 312. The gap is a thermal expansion space in the radial direction of the front end 300.

  The drive shaft member accommodation chamber 313 is disposed on the radially inner side of the cap body 310. The drive shaft member accommodation chamber 313 is connected to the front of the drive end accommodation chamber 312. The drive shaft member accommodation chamber 313 accommodates the rear end of the drive shaft member 91. The cap body 310 and the drive shaft member 91 are connected so as not to idle. As shown in FIG. 2, the drive shaft member 91 is rotatably supported by the bearing portion 240. A sprocket 92 is fixed to the front end of the drive shaft member 91. The driving force of the motor is transmitted to the sprocket 92 via a chain (not shown). With the driving force, the roller assembly 3 can rotate around the axis of the rotation axis B1 shown in FIG.

  The spring member 311 is made of spring steel and has a plate shape. The spring member 311 includes a fixed end 311a and a free end 311b. The fixed end 311 a is disposed at the front end of the spring member 311. The fixed end 311 a is accommodated in the recess 310 a of the cap body 310. The fixed end 311 a is fixed to the recess 310 a by a screw 93. The free end 311b has a V shape that is pointed radially inward. The free end 311 b is disposed at the rear end of the spring member 311. The spring member 311 can be elastically deformed with the fixed end 311a as a fulcrum. Therefore, as shown by a double-ended arrow in FIG. 3, the free end 311 b can be engaged with and disengaged from the spring member insertion hole 300 b of the front end 300 through the spring member insertion hole 310 b of the cap body 310. When the free end 311b engages with the spring member insertion hole 300b, the cap body 310 and the roller 30 are coupled so as not to idle.

  When attaching the driving end cap 31 to the roller 30, the front end 300 is inserted into the driving end accommodating chamber 312 from the rear. Pushed by the end surface of the front end 300, the free end 311b of the spring member 311 escapes radially outward while accumulating urging force. When the end surface of the front end 300 reaches the bottom surface of the drive end accommodation chamber 312, the spring member insertion hole 300b reaches the radially inner side of the free end 311b. For this reason, the free end 311b enters the spring member insertion hole 300b while releasing the urging force. Thus, the drive end cap 31 can be attached to the roller 30 with a single touch.

  FIG. 4 is an enlarged perspective view of the vicinity of the rear end of the roller assembly of the roller hearth kiln according to the present embodiment. FIG. 5A shows a cross-sectional view in the VV direction of FIG. FIG. 5B shows a cross-sectional view in the VV direction of FIG. 4 when the roller rotates 180 °. As shown in FIGS. 4, 5 (a), and 5 (b), the driven end cap 32 is attached to the rear end 301 of the roller 30. The driven end cap 32 includes a cap body 320, a driven end accommodating chamber 322, a supported portion 323, and a pin 324.

  The cap body 320 is made of SUS and has a stepped cup shape (bottomed cylindrical shape) that opens forward. The driven end storage chamber 322 is disposed on the radially inner side of the cap body 320. The trailing end 301 of the roller 30 is accommodated in the driven end accommodating chamber 322. The driven end accommodating chamber 322 has an arcuate inner peripheral surface centered on the central axis B <b> 2 of the roller 30. The supported portion 323 is disposed in the front portion of the cap body 320. The supported portion 323 has an arcuate outer peripheral surface with the rotation axis B <b> 1 of the roller 30 as the center. The supported portion 323 is rotatably supported on the pair of left and right tires 250 of the driven side bracket 25.

  A pin insertion hole 320a is formed at a substantially central portion in the front-rear direction of the cap body 320 so as to face the 180 °. In addition, a pin insertion hole 301a is formed in the rear end 301 of the roller 30 so as to face the rear end 301 °. The pin 324 penetrates these pin insertion holes 320a and 301a in the radial direction. The cap body 320 and the roller 30 are connected by the pin 324 so as not to idle.

[Motion of Laura Heartiln]
Next, the movement of the roller hearth kiln according to the present embodiment will be described. In FIG. 6, the model top view of the roller hearth kiln of this embodiment is shown. Hereinafter, in the arrangement direction of the workpiece 90, the left-right direction is referred to as "row" and the front-rear direction is referred to as "column". In FIG. 6, the workpieces 90 are hatched for each row for convenience of explanation.

  As shown in FIG. 6, a large number of workpieces 90 (powder contained in a box-shaped case opening upward) are arranged relatively densely on the large number of rollers 30 in order to increase the efficiency of heat treatment. It is mounted in a state. That is, a large number of objects to be processed 90 are conveyed in a state of being arranged in three rows. The workpiece 90 is transported by a number of rotating rollers 30 along a transport path that continues from the loading section A1 to the heat treatment section A2 to the unloading section A3. A heat treatment chamber 21 shown in FIG. 1 is arranged in the heat treatment section A2. The workpiece 90 being transported is subjected to heat treatment in a predetermined temperature pattern by a large number of heaters 4 in two upper and lower stages.

  FIG. 7 shows a schematic perspective view of the rotating roller. The amount of rattling of the front end 300 is regulated by the inner peripheral surface of the drive end accommodation chamber 312 shown in FIG. For this reason, as shown in FIG. 7, the rotation radius R <b> 1 of the outer peripheral surface of the front end 300 (the rotation radius when the backlash amount is maximum) matches the radius of the inner peripheral surface of the drive end accommodation chamber 312. The rotation radius R1 of the outer peripheral surface of the front end 300 is larger than the radius R3 of the outer peripheral surface of the roller 30.

  On the other hand, the amount of eccentricity of the rear end 301 is determined by the shift amount L1 of the center axis B2 with respect to the rotation axis B1 shown in FIGS. 5 (a) and 5 (b). As shown in FIG. 7, the rotation radius R <b> 2 of the outer peripheral surface of the rear end 301 is larger than the radius R <b> 3 of the outer peripheral surface of the roller 30.

  Further, the rotation radius R4 of the outer peripheral surface of the central portion in the front-rear direction of the roller 30 is determined by the rotational state of the front end 300 and the rear end 301. Since the front end 300 rotates while the front end 300 is rattling and the rear end 301 is eccentric, the rotation radius R4 of the outer peripheral surface is larger than the radius R3 of the outer peripheral surface of the roller 30.

  Thus, the rotating state of the roller 30 is as if it is a double taper shape having a front end 300 of the rotation radius R1 and a rear end 301 of the rotation radius R2 (a taper that decreases in diameter from both axial ends toward the axial center). ) Is rotating. For this reason, the difference between the circumferential movement amount of the front end 300, the circumferential movement amount of the rear end 301, and the circumferential movement amount of the central portion in the front-rear direction becomes small.

[Function and effect]
Next, the effect of the roller hearth kiln of this embodiment will be described. According to the roller hearth kiln 1 of the present embodiment, as shown in FIGS. 5A and 5B, the central axis B2 can be decentered with respect to the rotation axis B1 at the rear end 301. For this reason, the rotation state of the rear end 301 can be approximated to the rotation state of the front end 300. Therefore, as shown in FIG. 6, the conveyance speed of the foremost workpiece 90 and the conveyance speed of the last row of workpiece 90 can be approximated.

  Further, according to the roller hearth kiln 1 of the present embodiment, as shown in FIG. 7, the rotation radius R4 of the outer peripheral surface of the central portion in the front-rear direction of the roller 30 is larger than the radius R3 of the outer peripheral surface of the roller 30. For this reason, the rotation state of the center part in the front-rear direction of the roller 30 can be brought close to the rotation state of the front end 300 and the rear end 301. Therefore, as shown in FIG. 6, the transport speed of the workpieces 90 in the central row can be made closer to the transport speed of the workpieces 90 in the front row and the last row. Therefore, as can be seen from a comparison between FIG. 6 and FIG. 9B, variations in the conveyance speed of the workpiece 90 can be suppressed. Moreover, the dispersion | variation in the heat processing time of the three to-be-processed objects 90 which belong to the same row | line | column can be suppressed.

  Further, according to the roller hearth kiln 1 of the present embodiment, as shown by the dotted line hatching in FIG. 7, the roller 30 rotates in a state where the front end 300 and the rear end 301 are synchronized (the rotation angle is the same). There is also. In this case, the rotation state of the central portion in the front-rear direction of the roller 30 can be made closer to the rotation state of the front end 300 and the rear end 301.

  Further, according to the roller hearth kiln 1 of the present embodiment, the column width W1 of the three workpieces 90 belonging to the same column is widened on the downstream side, as can be seen by comparing FIG. 6 and FIG. 9B. Hateful. Therefore, when the workpieces 90 are paid out from the heat treatment zone A2 to the carry-out zone A3, the workpieces 90 can be easily fed out by being divided into columns.

  Moreover, the dispersion | variation in the conveyance speed of the to-be-processed object 90 can be suppressed only by attaching the driven end cap 32 to the rear end 301 of the roller 30 of the existing roller hearth 1.

  Further, according to the roller hearth kiln 1 of the present embodiment, the axial alignment accuracy between the front end 300 and the drive end cap 31 is higher at the front end 300 of the roller 30 than when the rotation axis B1 and the center axis B2 are aligned. Not required. For this reason, the manufacturing cost is low. In addition, a gap can be secured between the outer peripheral surface of the front end 300 and the inner peripheral surface of the drive end accommodation chamber 312. For this reason, it is possible to cope with the thermal expansion of the roller 30.

  Further, according to the driven end cap 32 of the present embodiment, as shown in FIGS. 5A and 5B, the rear end 301 can be rotated only by accommodating the rear end 301 in the driven end accommodating chamber 322. The axis B1 and the center axis B2 can be shifted.

  Moreover, according to the roller hearth kiln 1 of this embodiment, as shown in FIG. 3, the drive end cap 31 can be attached to the roller 30 by one touch. For this reason, attachment work is easy.

  Even if the rear end 301 of the roller 30 and the outer peripheral surface of the supported portion 323 are concentric, if a clearance is secured between the outer peripheral surface of the rear end 301 and the inner peripheral surface of the driven end accommodating chamber 322, Like the front end 300, the rear end 301 can be rattled. However, in this case, it is difficult to tune the amount of rattling of the rear end 301. Moreover, since both the front end 300 and the rear end 301 rotate irregularly, the conveyance state becomes unstable. On the other hand, according to the roller hearth kiln 1 of this embodiment, the rotation locus of the rear end 301 is constant. That is, the rear end 301 rotates regularly. For this reason, the conveyance state is unlikely to become unstable.

  Further, when the roller 30 is made of metal, the workability of the roller 30 is high. For this reason, it is easy to make the shape of the roller 30 into a double taper shape as shown in FIG. However, the metal roller 30 may not be used depending on the atmosphere of the heat treatment chamber 21 and the characteristics of the workpiece 90 (for example, dislike contamination). In this case, a ceramic roller 30 such as mullite or SiC is used. When the roller 30 is made of ceramics, the workability of the roller 30 is low. For this reason, it is difficult to form the roller 30 in a tapered shape. Thus, when the workability of the roller 30 is low, the driven end cap 32 of the roller hearth kiln 1 of this embodiment is particularly effective.

<Second embodiment>
The difference between the roller hearth kiln of this embodiment and the roller hearth kiln of the first embodiment is that the driven end cap is connected to the driven shaft. Here, only differences will be described.

  FIG. 8 is an enlarged perspective view of the vicinity of the rear end of the roller assembly of the roller hearth kiln according to the present embodiment. In addition, about the site | part corresponding to FIG. 4, it shows with the same code | symbol. As shown in FIG. 8, a driven shaft member 95 is fixed to the rear end of the cap body 320. The driven shaft member 95 is supported by a bearing portion (not shown) so as to be rotatable about an axis. The center axis B3 of the driven shaft member 95 is eccentric with respect to the center axis B4 of the cap body 320 (= the center axis of the rear end 301 of the roller 30). The center axis B3 coincides with the rotation axis of the roller 30.

  The roller hearth kiln according to the present embodiment has the same operational effects as the roller hearth kiln according to the first embodiment with respect to the parts having the same configuration. Moreover, according to the roller hearth kiln of this embodiment, the tire 250 and the supported part 323 shown in FIG. 4 are unnecessary. For this reason, the surface shape of the outer peripheral surface of the cap body 320 is simplified. Further, the eccentric amount of the rear end 301 can be adjusted only by changing the radial position of the driven shaft member 95 with respect to the concentric bottomed cylindrical cap body 320.

<Others>
The embodiment of the roller hearth kiln of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  In the said embodiment, although the driven end cap 32 was attached to the roller 30 of the roller hearth kiln 1, you may attach to the roller of a general roller conveyor. In this case, the conveyed object may not be heated.

  Further, the radial cross section of the outer peripheral surface of the roller 30 may not be circular. It may be a polygon such as a triangle or a rectangle. The outer peripheral surface of the roller 30 should just be the same diameter over the axial direction full length. Further, the roller 30 may be hollow or solid. Further, the shapes of the drive side bracket 24 and the driven side bracket 25 may not be L-shaped.

Further, the material of each member such as the outer wall 200, the driving side bracket 24, the driven side bracket 25, the roller 30, and the heater 4 is not particularly limited. For example, the outer wall 200 may be formed of a metal such as aluminum or iron, or carbon. The roller 30 may be made of SiC or alumina. The roller 30 and the heater 4 may be made of metal (for example, SUS, Inconel (registered trademark) , Hastelloy (registered trademark) ).

  Further, an atmospheric gas such as nitrogen gas, argon gas, or carbon monoxide gas may be appropriately supplied to the heat treatment chamber 21 in accordance with the processing of the workpiece 90. Further, the workpiece 90 may be heated using a microwave, a burner or the like instead of the heater 4 or together with the heater 4.

  When atmospheric gas, microwaves, or a burner is used, an open / close door is required between the heat treatment section A2 and the carry-out section A3 shown in FIG. For this reason, the necessity to pay out the to-be-processed object 90 for every row | line becomes high. In such a case, the roller hearth kiln 1 of the present invention is particularly suitable.

  In the above embodiment, the driven end caps 32 are attached to the rear ends 301 of all the rollers 30, but the driven end caps 32 may be attached only to some of the rollers 30. That is, the number of the driven end caps 32 is increased or decreased according to the degree of variation in the conveyance speed of the workpiece 90 (for example, the row width W1 of the three workpieces 90 belonging to the same row shown in FIG. 6). That's fine. If it carries out like this, compared with the case where the driven end cap 32 is attached to the rear end 301 of all the rollers 30, the installation cost of the roller hearth kiln 1 will become low.

  Further, as shown in FIG. 7, in the driven end cap 32, if the amount of eccentricity of the central axis B2 with respect to the rotational axis B1 is set large, the rotational radius R2 of the outer peripheral surface of the rear end 301 becomes large. For this reason, the number of arrangement | positioning of the driven end cap 32 can be reduced by setting eccentricity large.

  The conventional roller 101 shown in FIG. 12 and the roller 30 of the above-described embodiment shown in FIG. 7 have different movements during rotation (particularly, movement near the rear end 301). For this reason, when the workpiece 90 is transferred from the conventional roller 101 (upstream side) to the roller 30 (downstream side) of the above-described embodiment, the workpiece 90 near the rear end 301 seems to run on the roller 30. Move to. At this time, the weight of the workpiece 90 tends to concentrate near the rear end 301 of the roller 30. In this case, it is possible to suppress the weight of the workpiece 90 from being concentrated near the rear end 301 of the roller 30 by appropriately adjusting the mounting position of the tire 250 in the vertical direction.

1: roller hearth kiln, 2: housing, 3: roller assembly, 4: heater.
20: Housing body, 21: Heat treatment chamber, 22: Roller insertion hole, 23: Heater insertion hole, 24: Drive side bracket, 25: Drive side bracket, 30: Roller, 31: Drive end cap (Roller drive end connecting member) 32: driven end cap (roller driven end connecting member), 90: workpiece, 91: drive shaft member, 92: sprocket, 93: screw, 95: driven shaft member.
200: outer wall, 201: heat insulating material, 240: bearing portion, 250: tire (rolling element), 300: front end (drive end), 300b: spring member insertion hole, 301: rear end (driven end), 301a: pin insertion Hole, 310: Cap body, 310a: Recess, 310b: Spring member insertion hole, 311: Spring member, 311a: Fixed end, 311b: Free end, 312: Drive end storage chamber, 313: Drive shaft member storage chamber, 320: Cap body, 320a: pin insertion hole, 322: driven end accommodating chamber, 323: supported portion, 324: pin.
A1: carry-in section, A2: heat treatment section, A3: carry-out section, B1: rotation axis, B2: central axis.

Claims (5)

A driving end to which the driving force is transmitted, a driven end disposed on the opposite side of the driving end in the axial direction, a rotating shaft that is a rotation center when rotating around the axis by the driving force, and a radial center A central axis extending in the axial direction from the drive end to the driven end, and a roller having the same diameter for conveying an object to be processed,
A roller driving end connecting member that is attached to the driving end so as to transmit the driving force to the driving end, and the central axis of the driving end deviates from the rotation axis;
A roller driven end connecting member to which the driven end is attached so that the central axis is eccentric with respect to the rotation axis at the driven end;
Comprising a roller assembly having
A roller hearth kiln that conveys the workpiece by rotating the roller.   The roller driven end connecting member is rotatably supported by a rolling element, and is disposed on a supported portion having an arc-shaped outer peripheral surface with the rotation axis as a center, on a radially inner side of the outer peripheral surface, and the driven end The roller hearth kiln according to claim 1, further comprising: a driven end containing chamber having an arcuate inner circumferential surface centered on the central axis.   The roller driving end connecting member includes a driving end accommodating chamber in which the driving end is accommodated and having an arc-shaped inner circumferential surface centering on the rotation shaft, and the outer peripheral surface of the driving end and the driving end accommodating chamber The roller hearth kiln according to claim 1 or 2, wherein a gap is defined between the inner peripheral surface and the inner peripheral surface.   A roller driven end coupling member attached to the driven end of a roller having the same diameter having a driving end, a driven end, a rotation shaft, and a central axis,
  The roller conveys the workpiece in the roller hearth kiln,
  The driven end of the roller is disposed axially opposite the driving end of the roller;
  The rotation shaft of the roller is a rotation center when the roller rotates around the shaft by a driving force transmitted to the driving end of the roller,
  The central axis of the roller is disposed at the radial center of the roller and extends axially from the driving end of the roller to the driven end of the roller;
  At the driving end of the roller, the central axis of the roller is deviated from the rotation axis of the roller.
  A roller driven end connecting member that holds the central axis of the roller eccentrically with respect to the rotation shaft of the roller at the driven end of the roller. A supported part that is rotatably supported by the rolling element and has an arcuate outer peripheral surface centered on the rotation axis;
A driven end receiving chamber disposed on the radially inner side of the outer peripheral surface, in which the driven end is stored, and having an arc-shaped inner peripheral surface centered on the central axis;
A roller driven end connecting member according to claim 4.

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