WO2018061325A1

WO2018061325A1 - Chain type transport device

Info

Publication number: WO2018061325A1
Application number: PCT/JP2017/021092
Authority: WO
Inventors: 尚史後藤; 英輝志村; 実南田
Original assignee: 中外炉工業株式会社
Priority date: 2016-09-29
Filing date: 2017-06-07
Publication date: 2018-04-05
Also published as: JP2018052685A

Abstract

[Problem] To provide a chain type transport device which enables a workpiece to be heated all around, the workpiece to be uniformly heat-treated, and a countermeasure against the thermal elongation of the mechanism to be improved. [Solution] Provided is a chain type transport device 1 for transporting a workpiece (gear) to be heat treated, wherein the chain type transport device 1 has a pair of chains 3, 3 extending in the transport direction and arranged at a distance from each other; a plurality of bridging rods 4 mounted across the pair of chains and circulating with the pair of chains; and a plurality of arms 18 which are mounted to the bridging rods so as to extend in the transport direction and on which the workpiece is placed.

Description

Chain type conveyor

The present invention relates to a chain type conveying apparatus for conveying a workpiece to be heat-treated in a heat treatment furnace.

As a transport device that transports a workpiece to be heat-treated in a heat treatment furnace, for example, a transport device that transports the work on a mesh belt and transports the inside of the heat treatment furnace is known (see, for example, Patent Document 1). It is known to be formed by a plurality of generally flat metal wire spirals having an upper transport surface, a lower surface and side edges, each extending across the belt (e.g. 2).

In addition, a transport device is known that transports a slat plate with rollers attached to both ends by roller guides provided at both ends in the width direction, and transports the workpieces side by side on the slat plate (see, for example, Patent Document 3). . In addition, support rods that extend the rotation shafts of the endless chain pieces installed at both ends of the cradle for receiving goods are fitted to both ends of the pipe-shaped conveyance rod, and the endless chain is driven to drive the endless chain. A conveying device that pushes and conveys a cradle is known (see Patent Document 4).

JP 2002-318076 A JP 7-172533 A JP-A-7-148540 Japanese Patent Laid-Open No. 10-320634

In the case of the transport device using the mesh belt as described above, since the mesh belt is made of a metal wire, heat resistance is ensured, but a large amount of wire is required to obtain sufficient strength. Since the mesh belt is made finer, the front and back air permeability cannot be sufficiently obtained, and in the case of a transfer device using a slat plate, no air permeability from the lower side of the work is obtained. . For this reason, in any case, it is difficult to heat-treat the workpiece uniformly. In addition, for example, when transporting a workpiece having a protruding portion such as a gear with a shaft, it is difficult to transport the workpiece while maintaining the same posture on a plane such as a mesh belt or a slat plate. There is.

The present invention was devised in view of the above-described conventional problems, and an object thereof is to provide a chain type conveying apparatus capable of more uniform heat treatment of a workpiece.

A chain type conveying apparatus according to the present invention is a chain type conveying apparatus that conveys a workpiece to be heat-treated, and a pair of chains that are arranged along the conveying direction and spaced apart from each other, and spans between the pair of chains. And a plurality of spanning rods that circulate together with the pair of chains, and a plurality of arms that are provided on the spanning rod along the transport direction and on which the workpiece is placed. To do.

Further, the pair of chains each have a protruding rod protruding in a direction facing each other, the bridge rod has an insertion portion into which the protruding rod is inserted at both ends, and one end is It is fixed to the projecting rod, and the other end is inserted so as to be relatively movable in the longitudinal direction of the spanning rod.

Further, the arm is provided across two different connecting rods, attached to one of the connecting rods, and placed on the other connecting rod.

The arm has a rotation support end, and the rotation support end is rotatably attached to the bridge rod.

Further, the arm is mounted on the other bridge rod so as to be relatively movable in the transport direction.

In addition, a plurality of arm pairs each including two arms on which a single workpiece is placed and spaced apart in the longitudinal direction of the spanning rod are provided in the transport direction. The two matching arm pairs are characterized in that two arms forming the other arm pair are arranged between the two arms forming one arm pair.

According to the present invention, the workpiece can be heated from the entire circumference, the workpiece can be uniformly heat-treated, and the measures against the hot elongation of the mechanism can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram for explaining a chain-type transport device according to the present embodiment, where (a) is a plan view showing a part of the chain-type transport device in the transport direction, and (b) is a view taken along line BB in FIG. FIG. It is a partially exploded perspective view which shows the structure of the chain type conveying apparatus which concerns on this embodiment. FIG. 2 is a partial cross-sectional view taken along line AA in FIG. It is a perspective view which shows the structure of the roller chain of the chain type conveying apparatus shown in FIG. It is a figure which shows the sprocket periphery of the drive side of the chain type conveying apparatus which concerns on this embodiment. It is sectional drawing which shows the 1st modification of the chain type conveying apparatus shown in FIG. It is explanatory drawing explaining the 2nd modification of the chain type conveying apparatus shown in FIG. 1, (a) is a top view which shows the one part in a conveyance direction, (b) is the same figure (a), T FIG. It is explanatory drawing for demonstrating the rotation structure of an arm, Comprising: (a) is a top view which shows a 1st example, (b) is a top view which shows a 2nd example, (c) is with respect to (b) It is a sectional side view. It is a figure which shows the aspect of the arm in the sprocket periphery of the chain type conveying apparatus which concerns on this embodiment. It is explanatory drawing explaining the 3rd modification of the chain type conveying apparatus shown in FIG. 1, (a) is a top view which shows the one part in a conveyance direction, (b) is the same figure (a), V FIG.

Hereinafter, a preferred embodiment of a chain type conveying apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In the present embodiment, for example, a chain type conveying device for conveying the inside of a heat treatment furnace to heat-treat a gear with a shaft as a workpiece will be described as an example. The interior of the heat treatment furnace is made an atmosphere of uniform temperature by a heater and a circulation fan (both not shown) installed therein. As shown in FIG. 1 to FIG. 3, the chain type conveying apparatus 1 according to the present embodiment is arranged at intervals in a direction intersecting with the conveying direction (hereinafter referred to as the intersecting direction) and extends along the conveying direction. Two rails 2, a pair of endless roller chains 3 that are guided by each rail 2 and move on each rail 2, a plurality of spanning rods 4 spanned between the pair of endless roller chains 3, and auxiliary And a pipe 23.

As shown in FIG. 4, the roller chain 3 is separated from each other between two opposed inner plates 5 by two cylindrical bushes 7 into which two rollers 6 are inserted. The two inner plates 5 are connected to the bush 7 and are provided with through-holes 8 therethrough, and two adjacent inner links. 9 has two shaft portions 10 inserted into one of the bushes 7, and a plurality of outer links 12 each connecting the two shaft portions 10 with an outer plate 11 are connected to each other to be endless. ing. The two shaft portions 10 are each extended in a direction in which the two roller chains 3 face each other, and the two shaft portions 10 included in the outer link 12 correspond to protruding rods. The shaft portion 10 is a stepped pin that is inserted from one side of the roller chain 3 and protrudes to the opposite side (indicated by α in the figure), and then crimped (indicated by β in the figure). The shaft portion 10 itself can also be rotated so that the inner plate 5 and the outer plate 11 can be bent while sandwiching the entire inner link 9 and outer link 12 (indicated by γ in the figure).

The two rails 2 are configured such that a plate-like rail body 14 is provided on a pedestal 13 so as to stand vertically along the transport direction. The thickness of the plate-like rail body 14 is narrower than the distance between the inner plates 5 of the inner links 9 constituting the roller chain 3.

As shown in FIG. 5, the two roller chains 3 are wound around a sprocket 15 provided on the end side of each rail 2 and driven by a driving device (not shown) provided with the sprocket 15. The roller 6 rolls on the rail 2 while being guided by the opposed inner plate 5 and outer plate 11 while the roller 6 rolls. Further, a guide 22 is provided on the outer peripheral side of the sprocket 15 at the end of the chain type conveying device 1.

A spanning rod 4 is spanned on each of the shaft portions 10 provided on the two roller chains 3 and extending opposite to each other, and the span is spanned between the two roller chains 3. The transfer rods 4 are arranged at equal intervals in the transport direction. Further, an auxiliary pipe 23 for temperature adjustment is disposed between the spanning rods 4.

Each bridging rod 4 has a cylindrical shape penetrating in the longitudinal direction, and two shaft portions 10 facing each other are inserted from both ends. One of the two shaft portions 10 inserted in the spanning rod 4 is connected together with the spanning rod 4 by a split pin 17 penetrating in the diameter direction of the spanning rod 4, and the other is a rail. The shaft portion 10 is engaged so as to be movable in the insertion / removal direction in a state where it is not restricted by 2 or the like, that is, in a state having a gap S as shown in FIG. Here, the site | part which the spanning rod 4 which makes | forms the cylinder shape is equivalent to an insertion part. The auxiliary pipe 23 also has the same mounting structure as the spanning rod 4.

The plurality of connecting rods 4 and the auxiliary pipes 23 provided between the two roller chains 3 are different in the side where the ends connected by the split pins 17 between the adjacent connecting rods 4 and the auxiliary pipes 23 are located. To do. That is, the plurality of spanning rods 4 and the auxiliary pipes 23 arranged in the transport direction are alternately arranged with the bridging rods 4 and the auxiliary pipes 23 connected by the split pins 17 on one end side. ing.

As described above, since the bridge rod 4 and the auxiliary pipe 23 are movable on one side in the insertion / removal direction, even if the bridge rod 4 and the auxiliary pipe 23 are heated and extended due to heating in the heat treatment furnace, they Since it can be absorbed by the movement, the hot elongation does not affect the driving of the roller chain 3.

Each bridging rod 4 has a workpiece (an exemplary gear) W that is transported in a unified manner on either the front side or the rear side of the two shaft portions 10 of the outer link 12 in the transport direction. A plurality of arms 18 on which are mounted is rotatably provided. The arm 18 is a plate-like member in which one end portion in the longitudinal direction is rotatably provided on the bridge rod 4. In order to make the arm 18 turnable, as shown in FIG. 8 (a), the arm 18 is welded to the bridge rod 4 (indicated by D in the figure), so that all the arms 18 can be simultaneously rolled. The arm 18 (18c, 18d) which is rotated with the shaft portion 10 of the chain 3 or halved by processing the groove 16 in the bridge rod 4 as shown in FIGS. 8 (b) and 8 (c). The arm 18 can be individually rotated by being sandwiched between the two and welded with the both inserted into the groove 16 (indicated by F in the figure). The position in the crossing direction can also be fixed.

When the roller rod 3 is driven to move the transfer rod 4, the arm 18 is arranged in the longitudinal direction along the transfer direction, and the transfer rod 4 provided with the arm 18 is rearward in the transfer direction. The other end side in the longitudinal direction is placed on another bridging rod 4 provided with the arm 18 located on the side. At this time, with the other end side in the longitudinal direction of the arm 18 placed on the bridge rod 4, the upper edge of the arm 18 is substantially horizontal.

In this embodiment, the bridging rod 4 is bridged between all the opposed shaft portions 10, but there may be a bridging rod 4 in which the arm 18 is not provided. Since the arm 18 is merely mounted on the other end side in the transport direction not attached to the shaft portion 10 without being fixed to the bridge rod 4, the arm 18 is heated in the longitudinal direction by heating in the heat treatment furnace. However, the driving of the roller chain 3 is not affected.

Further, the plurality of arms 18 provided in each bridging rod 4 are arranged at appropriate intervals in the longitudinal direction of the bridging rod 4, that is, in the crossing direction substantially perpendicular to the transport direction. More specifically, each of the arms 18 provided on two adjacent connecting rods 4 of the connecting rods 4 provided with the arms 18 is provided on one connecting rod 4. A proximity portion 20 is arranged such that the rotation support end 18a side of the arm 18 and the placement support end 18b side of the arm 18 provided on the other spanning rod 4 are close to each other in the crossing direction. It is provided at intervals in the crossing direction. That is, in each bridging rod 4, the rotation support end 18 a of one arm 18 and the mounting support end 18 b of the other arm 18 are not in contact with each other even if the bridging rod 4 extends in the crossing direction. G (see FIG. 1) is provided, and the proximity portions 20 are provided at a plurality of positions at intervals in the crossing direction.

And in the adjacent part 20 mutually adjacent | abutted in the cross direction, it arrange | positions so that the position in the cross direction of the mounting support end 18b of the other arm 18 with respect to the rotation support end 18a of the one arm 18 may differ. . For example, in the proximity portion 20a located on the most end side (for example, the left side in FIG. 1) of a certain spanning rod 4, it is on the left side of the rotation support end 18a of the arm 18 provided on the spanning rod 4. The mounting support end 18b of the adjacent spanning rod 4 is located. In the proximity portion 20b located second from the left end, the placement support end 18b of the adjacent spanning rod 4 is positioned on the right side of the rotation support end 18a of the arm 18 provided on the spanning rod 4. Yes. In the proximity portion 20c located third from the left end, the placement support end 18b of the adjacent spanning rod 4 is located on the left side of the rotation support end 18a of the arm 18 provided on the spanning rod 4. Yes. As described above, the plurality of adjacent portions 20 provided in the intersecting direction are provided with the rotation support end 18a of the arm 18 included in the bridge rod 4 and the placement support end 18b of the arm 18 included in the adjacent bridge rod 4. The positions are alternately interchanged.

The gear W is placed and conveyed on an arm pair 19 composed of two arms 18 arranged at intervals in the longitudinal direction of the bridge rod 4. A plurality of arm pairs 19 are provided in the transport direction, and two arm pairs 19 adjacent in the transport direction are two arms 18 forming the other arm pair 19 between two arms 18 forming one arm pair 19. 18 is arranged.

For example, when the chain-type transport device 1 according to the present embodiment transports the shaft-equipped gear W for heat treatment, as shown in FIG. A gear W crosses over the arm 18 and the shaft Wa can be inserted between the bridging rods 4 adjacent to each other in the conveying direction so as to be placed along the vertical direction. The problem can be solved and maintained in the same posture on the plane. At this time, the two arms 18 arranged across the gear W correspond to the arm pair 19, and the space H between the arm pair 19 is a guideline for placing the gear W, which is a workpiece, on the chain type conveyance device 1. It can be placed by hand or robot. As a result, any gear W can be made to have uniform processing conditions.

The gears W on the arms 18 provided on the plurality of spanning rods 4 that move together with the roller chain 3 that is driven and circulated by the driving device are heated while being transported, and are moved to the transport device or the like in the next process. .

As shown in FIG. 9, when the arm 18 from which the gear W has been removed is moved to the opposite side to the conveying direction together with the roller chain 3 turned back by the sprocket 15 'provided on the opposite side to the drive device, It moves and moves down from the bridge rod 4 (indicated by R in the figure). And when it moves on the rail 2 again by the drive side sprocket 15, the arm 18 is placed on the bridge rod 4 located on the rear side in the transport direction while rotating. A new gear W before the heat treatment is placed and transported on the arm 18 that is arranged horizontally again.

According to the chain type conveying apparatus 1 of the present embodiment, the plurality of transfer rods 4 that are bridged between a pair of roller chains 3 that are spaced apart from each other and circulate together with the pair of roller chains 3 are heat-treated. Since the arm 18 on which the gear W is mounted is provided, the portion on which the gear W is mounted is opened in the vertical direction. Since the gear W is transported on the heater 16 by the chain transport device 1, heat treatment can be performed efficiently. Further, since the portion where the gear W is placed is opened in the vertical direction, even if the gear W is provided with the axis Wa, the gear W is substantially arranged by arranging the axis Wa in the vertical direction. It is possible to arrange with the same posture. For this reason, it is possible to heat-process the some gear W mounted on the chain type conveying apparatus 1 more uniformly.

Further, in the pair of roller chains 3, two shaft portions 10 projecting in opposite directions are inserted into both end portions of the bridging rod 4, one end portion is fixed by the split pin 17, and the other Since the end portion is inserted so as to be relatively movable in the longitudinal direction of the bridging rod 4, even if the bridging rod 4 expands due to heat of heat treatment or contracts again after the expansion, the roller chain 3 is sprocketed. 15 or it is possible to prevent an excessive load from acting on the rail 2 or the like.

Also, if the roller chain 3 on the side opposite to the split pin 17 is removed, the transfer rod 4 can be removed simply by removing the split pin 17, so that the transfer is performed by changing the shape of the arm 18 depending on the shape of the gear (workpiece) W. The rod 4 can be easily replaced.

In addition, since the arm 18 is provided across two different bridge rods 4, the gear W can be disposed in a stable state. At this time, the arm 18 is attached to one of the two spanning rods 4 and freely rotates, so that the circulating roller chain 3 can be smoothly wound around the sprocket 15.

Since the arm 18 is pivotally attached to the bridge rod 4 at the leading end in the conveying direction, the arm 18 is suspended from the bridge rod 4 below the rail 2 by the sprocket 15. It is possible to dispose the mounting support end 18b of the arm 18 on the bridge rod 4 located on the rear side in the transport direction simply by pulling up to the upper side of the rail 2.

In the above-described embodiment, an example in which one end portion of the arm 18 is rotatably supported and the other end portion is placed on the adjacent spanning rod 4 has been described. In the case where it poses a hindrance, the guide 22 is provided in the entire lower side of the rail 2, or the engaging portion 21 that is relatively movable in the longitudinal direction of the arm 18 on the other end side as shown in FIG. It is also possible to engage with each other so as not to hang down. In this case, both ends of the arm 18 can be smoothly circulated together with the roller chain 3 without leaving the two adjacent connecting rods 4.

The auxiliary pipe 23 is heated and stored in a heat treatment furnace, and has an effect that the gear W can be heated uniformly by applying radiant heat to the gear (work) W from below. Depending on the distribution, it may be replaced with a different thickness.

Further, as shown in FIG. 7, the auxiliary pipe 23 does not need to be installed, and in this way, the area of the space H can be widened, and the projecting portion Wa has a large area and a long work W. Even if it exists, it can arrange | position with the same attitude | position on a plane.

In the above-described embodiment, the example in which the pair of arms 18 on which the gear W is placed is not connected has been described. However, as shown in FIG. 10, the pair of arms has a rotation support end and a placement support. You may connect with the connection material 24 by the edge. In this case, it is possible to further stabilize the placement of the gear W. Further, for example, when a gear is placed on an arm using a robot or the like, the position where the gear W is placed is recognized as a rectangular portion formed by the pair of arms, the connecting portion, and the bridge rod. This makes it easy to automate the process of placing a workpiece such as a gear.

Further, the above embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Chain type conveying apparatus 2 Rail 3 Roller chain 4 Transfer rod 5 Inner plate 6 Roller 7 Bush 8 Through-hole 9 Inner link 10 Shaft part 11 Outer plate 12 Outer link 13 Base 14 Rail body 15, 15 'Sprocket 16 Groove 17 Split Pin 18 Arm 18a Rotation support end 18b

Placement support end

18c, 18d Half split arm 19

Arm pair

20, 20a, 20b, 20c Proximity part 21 Engagement part 22 Guide 23 Auxiliary pipe 24 Connecting material G Gap H Space S Gap W gear Wa shaft

Claims

A chain type conveying device for conveying a workpiece to be heat-treated,
A pair of chains arranged along the conveying direction and spaced apart from each other;
A plurality of spanning rods that are spanned between the pair of chains and circulate with the pair of chains;
A plurality of arms provided along the transport direction on the bridge rod and on which the workpiece is placed;
A chain type conveying apparatus characterized by comprising:
Each of the pair of chains has protruding rods protruding in directions facing each other,
The spanning rod has an insertion portion into which the projecting rod is inserted at both ends, one end is fixed to the projecting rod, and the other end is relatively movable in the longitudinal direction of the spanning rod The chain type conveying device according to claim 1, wherein the chain type conveying device is inserted into the chain type conveying device.
2. The arm according to claim 1, wherein the arm is provided across two different bridging rods, is attached to one of the bridging rods, and is placed on the other bridging rod. The chain type conveying apparatus according to claim 2.
The chain-type transport device according to claim 3, wherein the arm has a rotation support end, and the rotation support end is rotatably attached to the bridge rod.
The chain type conveying device according to claim 3, wherein the arm is mounted on the other bridge rod so as to be relatively movable in the conveying direction.
A plurality of arm pairs each including two arms on which a single workpiece is placed and spaced apart in the longitudinal direction of the spanning rod are provided in the transport direction;
The two arm pairs adjacent to each other in the transport direction are arranged such that two arms forming the other arm pair are arranged between the two arms forming one arm pair. The chain type conveying apparatus according to any one of the above.