JP5250212B2 - Conveyor for continuous quenching furnace - Google Patents

Description

  The present invention relates to a transport device for a continuous quenching furnace that has a traveling belt that transports a workpiece to be heat-treated by a continuous quenching furnace through the continuous quenching furnace and corrects meandering of the traveling belt.

  In a continuous quenching furnace in which workpieces are continuously conveyed in the furnace and heat treated, the traveling belt that conveys the workpiece is also heated with the workpiece, so a mesh belt that has less adverse effects due to thermal stress, thermal fatigue, etc. is used. . Such a traveling belt may meander in a stretched position as it travels and meanders, and various measures are taken to suppress meandering (see, for example, Patent Documents 1 and 2).

As a countermeasure against meandering of the traveling belt, there is one that adjusts meandering of the mesh belt by gradually changing the axial center position of the driving roller of the mesh belt. Also, there is a type in which two driving rollers of the traveling belt are arranged perpendicular to the traveling direction of the traveling belt, the meandering of the traveling belt is detected by a sensor, and the meandering of the traveling belt is corrected by making the rotational speeds of the two driving rollers different. .
Japanese Patent Laid-Open No. 10-1204 Japanese Patent Application Laid-Open No. 7-157048

  When correcting the meandering of the running belt by controlling the rotational speed of the driving roller, or when correcting the meandering of the running belt by adjusting the axis of the driving roller of the running belt, the configuration tends to be complicated, and the meandering of the running belt Adjustment was sometimes difficult.

  Accordingly, an object of the present invention is to provide a continuous quenching furnace conveying apparatus that reliably suppresses meandering of a running belt with a simple configuration.

The continuous quenching furnace conveying apparatus according to the present invention includes a plurality of conveying rollers, a traveling belt, and a guide. Running belt is stretched into a plurality of conveying rollers, the workpiece placed on the upper conveying surface is work to those endless to convey to the running direction through the continuous hardening furnace for performing heat treatment . The guide is provided at a position that is fixed independently from the plurality of transport rollers, and is upstream of the continuous quenching furnace in the travel direction of the travel belt, on the same plane as the upper transport surface. It is arranged on the side. The guide includes a plate and a roller. Plate is pivotally supported swingably intermediate portion I by the normal direction and the axis of the fixedly disposed at a position spaced from the traveling belt to a parallel axis of the upper conveying surface. The roller is rotatably supported at each of both end portions of the plate, and the circumferential surface is capable of contacting the side portion of the upper conveying surface.

  The guide swings when the end on the upstream side in the running direction comes into contact with the edge of the meandering running belt, and the end on the downstream side in the running direction also comes into contact with the edge of the running belt. Therefore, the pressure from the guide is always dispersed and applied to the edge of the meandering running belt, and the meandering of the running belt is corrected by this applied force.

  This guide may be arranged on both sides of the upper conveying surface. Thereby, meandering in any direction of the traveling belt can be suppressed.

  According to the present invention, when one end of the guide comes into contact with the edge of the meandering traveling belt, the guide swings, and both ends of the guide come into contact with the edge of the running belt, thereby suppressing meandering of the running belt. Therefore, the meandering of the traveling belt can be reliably suppressed with a simple configuration.

  Hereinafter, a configuration example of the continuous quenching furnace transfer device will be described with reference to the drawings. The description of the same configuration in each drawing may be omitted.

  FIG. 1 is a diagram for explaining the relationship between a traveling belt and a plurality of conveying rollers for driving the traveling belt in the continuous quenching furnace conveying apparatus. The continuous quenching furnace conveying apparatus 100 includes a guide 1, a traveling belt 2, and conveying rollers 3A to 3H. The continuous quenching furnace conveying apparatus 100 conveys the workpiece via the quenching furnace 4.

  The transport rollers 3A to 3H rotate in either the clockwise direction or the counterclockwise direction, respectively. In addition, an endless traveling belt 2 is stretched on each. A part of the transport rollers 3 </ b> A to 3 </ b> H gives a driving force to the traveling belt 2. The traveling belt 2 stretched between the conveying rollers 3A and 3B constitutes an upper conveying path 2A. A workpiece such as a bearing is supplied onto the upper conveying path 2A from the left side of the drawing by a workpiece supply device (not shown). The workpieces continuously supplied onto the upper conveyance path 2A are respectively conveyed to the right side in the drawing, and are carried into the quenching furnace 4 through the arrangement position of the guide 1.

  The quenching furnace 4 performs a heat treatment at a predetermined temperature on the workpiece. For example, a workpiece such as a bearing is heated to a quenching temperature of 850 degrees. The workpiece heated in the quenching furnace 4 is released from the continuous quenching furnace conveying device at the downstream end of the quenching furnace 4. For example, a workpiece such as a bearing is freely dropped into a cooling oil tank (not shown) and rapidly cooled, and then is carried out of the cooling oil tank by another conveying means. The traveling belt 2 that has passed through the transport roller 3B is transported to the left side in the drawing under the upper transport path 2A, and again passes through the transport rollers 3C, 3D, 3E, 3F, 3G, and 3H, and then the upper transport path 2A again. To return. The arrangement and number of the transport rollers are not limited to this configuration example, and may be configured in any manner.

  Here, a mesh belt made of a heat-resistant metal wire is used as the running belt 2. By using this mesh belt, the occurrence of adverse effects such as thermal stress and thermal fatigue due to heat can be suppressed. However, no matter how the mesh belt is used, the traveling belt 2 is repeatedly heated (and then cooled) by the quenching furnace 4, and gradually deforms and deteriorates. Therefore, it gradually meanders to the left and right in the traveling direction.

  Therefore, in this configuration, as a measure against meandering of the traveling belt 2, the guide 1 is provided immediately before the quenching furnace 4 on the upstream side of the upper conveyance path 2A.

  FIG. 2 shows a detailed configuration example of the guide 1. 2C is a bottom view of the guide 1, and FIGS. 2A and 2B are an AA sectional view and a BB sectional view shown in FIG. 1C, respectively.

  The guide 1 includes a shaft 10, an upper shaft bearing 11, a lower shaft bearing 12, an upper plate 13, a lower plate 14, a fixed plate 15, roller pins 16A to 16D, rollers 17A to 17D, four upper roller bearings 18, and four lower rollers. A bearing 19, a nut 20, and a bolt 21 are provided.

  The shaft 10 is a round bar in which steps of φ17 mm, φ20 mm, φ25 mm, and φ20 mm are formed in order from the top in the figure, for example, using SUS steel as a raw material. The guide 1 is pivotally supported by the shaft 10.

  The upper shaft bearing 11 and the lower shaft bearing 12 are heat-resistant bearings having inner diameters of φ17 mm and φ20 mm, respectively, and are rotatably fitted to corresponding steps of the shaft 10.

  Each of the upper plate 13 and the lower plate 14 has substantially the same shape, and has an outer shape in which a trapezoidal protrusion protrudes about 25 mm from the vicinity of the center of one side of the oval long direction having a long direction of about 300 mm and a short direction of about 50 mm. Is a flat plate made of SUS steel. The upper plate 13 and the lower plate 14 are fixed to the upper shaft bearing 11 and the lower shaft bearing 12 by bolts 21, respectively. Further, a hole through which the shaft 10 and the roller pins 16A to 16D are inserted is formed.

  The fixed plate 15 is a flat plate made of SUS steel having a rectangular outer shape with a long direction of about 100 mm and a short direction of about 65 mm. The fixing plate 15 is formed with a circular hole in the center, and one end of the shaft 10 is fitted and fixed. Further, oval holes extending in the short direction of the fixing plate 15 are formed on both sides of the circular holes. The guide 1 is screwed and fixed to the exterior of the continuous quenching furnace conveying apparatus 100 through the oval hole.

  Each of the roller pins 16A to 16D is a SUS steel round bar in which male threads having a nominal size M10 are formed at both ends. Both ends of the roller pins 16 </ b> A to 16 </ b> D are layered through holes provided in the upper plate 13 and the lower plate 14, and the tips of the roller pins 16 </ b> A to 16 </ b> D protrude from the upper surface of the upper plate 13 and the lower surface of the lower plate 14. The nut 20 is screwed into this protruding portion. Further, φ15 mm and φ20 mm steps are formed in order from the top in the figure in the round bar portion excluding the portion where the male screw is formed in each of the roller pins 16A to 16D. An upper roller bearing 18 and a lower roller bearing 19 are rotatably fitted to the φ15 mm portion.

  Cylindrical rollers 17 </ b> A to 17 </ b> D made of SUS steel are fitted to the outer rings of the upper roller bearing 18 and the lower roller bearing 19. The rollers 17 </ b> A to 17 </ b> D are configured to be rotatable with respect to the upper plate 13 and the lower plate 14.

  The shaft 10 is positioned between the roller pin 16B and the roller pin 16C, and is rotatable through the upper shaft bearing 11 and the lower shaft bearing 12. Therefore, the upper plate 13 and the lower plate 14 are configured to be swingable about the shaft 10 together with the rollers 17A to 17D.

  With the guide 1 having the above-described configuration, the traveling belt 2 is prevented from meandering in the continuous quenching furnace conveying apparatus 100 of the present configuration example.

  FIG. 3 is a diagram illustrating the positional relationship between the traveling belt 2 and the guide 1. The traveling belt 2 travels downward in the figure. As an example, the guide 1 and the guide 101 are arranged on both sides of the traveling belt 2. The guide 101 has the same configuration as the guide 1. Here, the width of the traveling belt 2 in the lateral direction in the figure is about 500 mm, the contact surface (roller arrangement surface) of the guide 1 is parallel to the traveling direction of the traveling belt 2, and the traveling belt 2 is the guide 1 and the guide 101. The gap between the guide 1 and the traveling belt 2 is about 10 mm. The guide 101 is the same as the guide 1.

  Here, the traveling belt 2, which is a mesh belt, cuts a mesh fabric woven with a heat-resistant metal wire in a mesh shape into a long length, and solders the cut long side to another heat-resistant metal wire to create an edge. It is a product that is formed and short sides are joined endlessly. A long mesh fabric may be obtained by connecting a plurality of mesh fabrics.

  In the guide 1, the shaft 10 is arranged in parallel to the normal direction of the conveyance surface of the traveling belt 2. Therefore, the upper plate 13 and the lower plate 14 are rotatable about an axis parallel to the normal direction of the conveying surface of the traveling belt 2 together with the rollers 17A to 17D. Since the rollers 17 </ b> A to 17 </ b> D overlap with the traveling belt 2 in the height direction, the guide 1 can swing within a range that does not interfere with the edge of the traveling belt 2. The guide 101 is the same as the guide 1.

  For example, when the traveling belt 2 meanders and is displaced by a predetermined amount (about 10 mm) to the guide 1 side and the roller on the upstream side of the guide 1 contacts the edge of the traveling belt 2, The roller on the side is pressed, and torque in the direction of the arrow shown in the figure (counterclockwise direction) is generated in the guide 1. As a result, the guide 1 swings around the shaft 10 as a rotation axis, and the roller on the downstream side of the guide 1 presses the edge of the traveling belt 2.

  Thereby, each roller of the guide 1 presses the edge of the traveling belt 2 with a uniform dispersed pressure, and an excessive pressure is not instantaneously applied to the edges of the guide 1 and the traveling belt 2. Therefore, the risk of damage to the guide 1 and the running belt 2 is reduced.

  In addition, since the guide 1 and the edge of the traveling belt 2 are in contact with each other via the roller, the frictional force generated between them is extremely small, and the edge of the traveling belt 2 is hardly worn.

  Further, when the traveling belt 2 meanders in a direction to reduce the deviation, the guide 1 and the edge of the traveling belt 2 are quickly separated from each other, and both side edges of the traveling belt 2 are not in contact with the guide 1 and the guide 101. Therefore, in this state, the edge of the traveling belt 2 is not worn at all. Thus, since the contact time itself of the guide 1 and the traveling belt 2 is shortened, the risk of damage is reduced as compared with the configuration in which the guide and the traveling belt are always in contact.

  In this example, the guide 1 is configured to be swingable about the shaft 10. However, the rotation angle of the shaft 10 is determined so that the shaft 10 is parallel to the traveling direction of the traveling belt 2 in a no-load state. You may make it provide the spring member which returns to.

  The above description of the configuration example is an example in all respects and should be considered as not restrictive. The scope of the present invention is shown not by the above-described configuration example but by the scope of claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

It is a figure explaining the tension state of the running belt in the example of composition of the transfer device for continuous hardening furnaces. It is a figure explaining the example of composition of the guide in the example of the composition. It is a figure explaining the operation example of the guide in the same structural example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 ... Guide 2 ... Running belt 3 ... Conveying roller 4 ... Quenching furnace 10 ... Shaft 11, 12 ... Shaft bearing 13, 14 ... Plate 15 ... Fixed plate 16 ... Roller pin 17 ... Roller 18, 19 ... Roller bearing 100 ... Conveyor for continuous quenching furnace

Claims (2)

A plurality of conveying rollers;
Wherein the plurality of being conveyed roller stretching, the workpiece placed on the upper conveying surface, a running belt of endless conveying to the running direction through the continuous hardening furnace for performing heat treatment on the workpiece,
The traveling belt, which is provided at a position fixed independently from the plurality of conveying rollers, and is upstream of the continuous quenching furnace in the traveling direction of the traveling belt and on the same surface as the upper conveying surface. And a guide arranged on the side of
Plate the guide, which is swingably supported and an intermediate portion I by the shaft arranged secured to the position separated from the traveling belt to a normal direction parallel to the axis of the upper conveying surface And a continuous quenching furnace conveyance comprising: a roller rotatably supported at each of both end portions of the plate, the circumferential surface of which is abuttable against a side portion of the upper conveyance surface. apparatus.   The conveying device for a continuous quenching furnace according to claim 1, wherein the guides are arranged on both sides of the upper conveying surface of the traveling belt.

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