JP2008232516A - Heat treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat treatment device capable of being utilized in drying and baking a coated surface of a workpiece, after drying and coating a surface to be coated, of the workpiece on which pretreatment such as washing is performed in a coating line. <P>SOLUTION: This heat treatment device comprises a heat treatment furnace 40 opened at its lower side, a heating means (hot air circulation circuit 54, heating means 55, blower 56 for circulating hot air, and controller 57) in the heat treatment furnace 40, an opening/closing lifting body 45 for closing a lower release portion (opening portion 51) of the heat treatment furnace 40, a lifting driving means 44 for moving the opening/closing lifting body 45 up and down between an upper limit position for closing the lower release portion (opening portion 51) of the heat treatment furnace 40 and a lower limit position moved down to a lower part with respect to the heat treatment furnace 40 in parallel, and a workpiece supporting means 49 disposed on the opening/closing lifting body 45, and the workpiece W loaded on the workpiece supporting means 49 of the opening/closing lifting body 45 at the lower limit position, can be charged into the heat treatment furnace 40 by the moving-up of the opening/closing lifting body 45 to the upper limit position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat treatment apparatus that can be used in a coating line for drying a surface to be coated of a workpiece that has been pretreated, such as water washing, and drying / baking a painted surface of a workpiece after coating.

As described in Patent Document 1, as a heat treatment apparatus that batch-processes workpieces with this type of heat treatment apparatus, a heat treatment furnace is disposed beside the work conveyance path, and the conveyance traveling travels on the work conveyance path. 2. Description of the Related Art There is known a configuration in which a workpiece is taken in and out in a horizontal and lateral direction between the transfer traveling body and the inside of a heat treatment furnace by a workpiece transfer means such as a running fork system provided in the body.
JP-A-11-10056

  In the conventional batch type heat treatment apparatus as described above, since the opening for taking in and out the workpiece is provided horizontally in the lateral side wall of the heat treatment furnace, the opening can be closed during heat treatment or during standby. Heat treatment cannot be performed efficiently unless an open / close door is provided to prevent the hot air in the heat treatment furnace from escaping or heating means such as an infrared lamp that radiates heat rays toward the workpiece.

  An object of the present invention is to provide a heat treatment apparatus capable of solving the above-described conventional problems. In the invention described in claim 1, reference numerals of embodiments to be described later are given. As shown, the lower open heat treatment furnace 40, the heating means in the heat treatment furnace 40 (the hot air circulation path 54, the heating means 55, the hot air circulation blower 56, and the controller 57), the lower open part of the heat treatment furnace 40 ( An opening / closing lifting body 45 for closing the opening 51), a rising limit position for closing the opening / closing lifting body 45 for closing the lower release portion (opening 51) of the heat treatment furnace 40, and a lowering limit position for lowering from the heat treatment furnace 40. And a lifting / lowering driving means 44 that moves up and down in parallel, and a workpiece support means 49 provided on the opening / closing lift body 45, and transferred to the workpiece support means 49 of the opening / closing lift body 45 at the lower limit position. Open work W The increase to the ascent limit position of use the lifting body 45 proposes configured heat treatment apparatus so that it can be loaded into the heat treatment furnace 40.

  Specifically, as described in claim 2, the opening / closing lifting body 45 is provided with a duct space 58 and a hot air jet floor plate portion 59 communicating with the duct space 58. When the opening / closing lifting body 45 is in the ascending limit position, a hot air supply port 52 communicating with the duct space 58 of the opening / closing lifting body 45 is provided, and an exhaust port 53 is provided in the upper part of the heat treatment furnace 40, and the heating means ( The hot air circulation path 54, the heating means 55, the hot air circulation blower 56, and the controller 57) can be configured to supply hot air to the hot air supply port 52.

  Further, according to the third aspect of the present invention, the opening / closing lifting body 45 is mounted on a movable base 43 movable on the lower floor of the heat treatment furnace 40 so as to be movable up and down. The workpiece 45 is moved between the first position P1 at which the lower open portion (opening 51) of the heat treatment furnace 40 can be closed by the ascent and the workpiece support means 49 on the opening / closing elevator 45 at the lower limit position. It can be configured to be able to reciprocate between the second position P2 for transferring W.

  Furthermore, as described in claim 4, the workpiece W is suspended from a workpiece suspension platform 15 having supported portions 17a and 17b on both sides, and the workpiece suspension means includes a workpiece suspension platform. A pair of support rail members 48b for supporting the both side supported portions 17a, 17b of 15 are provided, and the work W supported by the work support means 49 via the work suspension base 15 is separated upward from the opening / closing lifting body 45. It can be configured to be suspended.

  According to the heat treatment apparatus according to the first aspect of the present invention, the furnace lower side portion, which is a good heat transfer direction by convection from the bottom to the top in the furnace, is opened as a work inlet / outlet. Thus, even if the lower opening of the heat treatment furnace, that is, the workpiece inlet / outlet is not closed by the open / close door during standby, the high temperature atmosphere in the furnace heated during the last heat treatment flows out of the furnace through the lower opening. Thus, the furnace temperature does not drop rapidly. Even when using a heating means of a type that supplies hot air into the furnace, it is easy to maintain the inside of the furnace at a required standby temperature without interrupting the supply of hot air to the furnace during standby. . Moreover, at the time of heat treatment, the furnace lower side opening corresponding to the work loading / unloading port of the heat treatment furnace can be closed by the opening / closing lifting body that moves up and down for loading the work into the heat treatment furnace. However, the heat treatment can be performed more efficiently than when the heat treatment is performed with the door open. In other words, it is possible to obtain a heat treatment apparatus that can be efficiently operated while providing a heat treatment apparatus having a simple structure and control without providing a dedicated opening / closing door at a work inlet / outlet of the heat treatment furnace. Of course, a hot air circulation type heating means can be easily used. Further, since the position of the heat treatment furnace is fixed in the same manner as in the prior art, a hot air circulation type heating means can be easily adopted as the heating means for heating the heat treatment furnace, and the present invention can be implemented simply and inexpensively.

  When implementing the present invention described above, when using a hot air circulation type heating means as a heating means in the heat treatment furnace, it is ideal to supply hot air efficiently from the bottom side in the heat treatment furnace. However, when a hot air circulation type heating means is used, according to the configuration described in claim 2, the heat treatment furnace has a structure in which an opening for taking in and out the work is provided at the bottom of the heat treatment furnace, and heat treatment for the work is performed. Sometimes hot air can be fed upward from the hot air spray floor plate portion of the opening / closing lift that supports the workpiece, and heat treatment can be performed efficiently.

  The opening / closing lifting body may be configured to be capable of moving only up and down. In this case, the work must be loaded and unloaded on the opening / closing lifting body located directly under the heat treatment furnace. With this configuration, the work loading / unloading work for the opening / closing lifting body can be performed in a state where the opening / closing lifting body is in the second position that is laterally separated from the position immediately below the heat treatment furnace. Even if the work is loaded and unloaded from the open / close lifting body by human work such as transfer work, the work is unloaded in an environment that is not directly affected by the radiant heat radiated downward from the lower opening of the heat treatment furnace. Even when the work loading / unloading work is performed by the work transfer means provided in the transport traveling body, the travel route of the transport traveling body is shown in plan view. Since it can be separated from the heat treatment furnace laterally, it is easy to construct a travel path for the transport traveling body, and the lateral movement amount of the workpiece transfer means provided in the transport traveling body can be shortened. Since it can do, the structure of the said workpiece transfer means becomes easy.

  Furthermore, although the workpiece can be placed on the lift for opening and closing, according to the configuration of claim 4, the workpiece in the heat treatment furnace is suspended from the workpiece suspension frame and its entire periphery. Can be exposed to the high-temperature atmosphere in the heat treatment furnace, so that the entire surface of the workpiece can be efficiently heat-treated, and the loading and unloading of the workpiece on the opening / closing lifting body can be performed safely and easily using the platform for hanging the workpiece be able to.

  A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a stacker crane type transport traveling body that can reciprocate along a horizontal linear work transport path 2. As shown in FIGS. 2 and 4, it engages with the lower carriage 4 supported by the supporting guide rail 3 laid on the floor and the steady guide rail 5 laid on the ceiling side. The upper frame 7 provided with the roller unit 6 is connected and integrated with a pair of front and rear support members 8, and a workpiece transfer means 10 is provided on an elevating carriage 9 that moves up and down between the pair of front and rear support members 8.

  The workpiece transfer means 10 is composed of a pair of left and right running forks 11 that can move in and out in both left and right directions in synchronization with each other. The running forks 11 include a fixed rail portion 12 fixed to the lower side of the elevating carriage 9, an intermediate fork portion 13 that is movable with respect to the fixed rail portion 12, and an intermediate fork portion 13 that protrudes from the intermediate fork portion 13. When the intermediate fork portion 13 is moved back and forth with respect to the fixed rail portion 12 by a conventionally known exit / retreat driving means, the final fork portion 14 becomes the intermediate fork portion 13. The final fork 14 is moved in the same direction with respect to the home position positioned at the lower center position of the lifting / lowering carriage 9 and the advancing limit positioned away from the lateral side of the lifting / lowering carriage 9. You can move to and from the position. Although the running fork 11 having one intermediate fork portion 13 is shown in the drawing, a plurality of intermediate fork portions 13 are formed in order to increase the lateral advance distance of the final stage fork portion 14 with respect to the lifting carriage 9. It is also possible to employ a running fork 11 having

  As shown in FIGS. 2 to 4, the workpiece W handled by the workpiece transfer means 10 is suspended on a workpiece suspension base 15 via an appropriate hanging tool 16. The work suspension base 15 is provided on the inner side of the pair of left and right first supported portions 17a and 17b provided so as to project outward on the left and right sides on both upper sides of the left and right ends. A pair of left and right second supported portions 18a and 18b is provided, and the second supported portions 18a and 18b are detachable from the final stage fork portion 14 of the pair of left and right running forks 11 in the workpiece transfer means 10. It is comprised so that it can engage.

  As shown in FIG. 1, on one side of a work transport path 2 on which the transport traveling body 1 travels, a first work unloading booth 19, a second work unloading booth 20, a painting booth 21, a pretreatment booth 22, a water wash The booth 23, the first heat treatment device 24, and the second heat treatment device 25 are arranged in this order, and a work temporary storage shelf 26 is erected over the entire area of the work transfer path 2 on the other side of the work transfer path 2. ing. The work temporary storage shelf 26 includes a large number of work storage spaces 26a that are partitioned in both the horizontal direction and the vertical direction along the work transfer path 2, and is provided above each work storage space 26a. A pair of left and right support rail members 27a and 27b on which the first supported portions 17a and 17b of the work suspension base 15 can be placed are installed.

  The first work unloading booth 19 and the second work unloading booth 20 have the same structure, and as shown in FIGS. 5 to 7, the work suspension platform 15 is orthogonal to the work transfer path 2 in these booths. Conveying means 28 for moving in the horizontal direction is provided. The conveying means 28 is composed of a pair of left and right chain conveyors 29a and 29b on which the pair of left and right first supported portions 17a and 17b of the work suspension base 15 can be placed. These chain conveyors 29a and 29b are supported by left and right side frames 30 standing in the booths 19 and 20, and are synchronously driven by motors 31a and 31b.

  As shown in FIGS. 8 and 9, the coating booth 21 is closed, which can open and close the side facing the workpiece transfer path 2 by an opening / closing shutter 32 and has an operator door 33 provided with an opening / closing door 33a. A conveying means 34 having the same structure as the conveying means 28 installed in the first work loading / unloading booth 19 and the second work loading / unloading booth 20 is provided.

  The pretreatment booth 22 and the flush booth 23 have the same structure, and as shown in FIGS. 10 and 11, the side facing the workpiece transfer path 2 can be opened and closed by an opening / closing shutter 35 and provided with an opening / closing door 36a. Conveying means 37 having the same structure as the conveying means 28 installed in the first work unloading booth 19 and the second work unloading booth 20 is formed in a closed space having an entrance / exit 36 for the worker. And a nozzle-equipped pipe 38 for injecting a pretreatment liquid and cleaning water to the workpiece W.

  The first heat treatment device 24 and the second heat treatment device 25 have the same structure, and as shown in FIGS. 12 to 15, a two-story structure comprising a lower work relay booth 39 and a heat treatment furnace 40 provided thereon. It is. The work relay booth 39 is composed of a partitioned space having a pit-like floor surface that is open on the workpiece transfer path 2 side and lower than the floor surface of the work transfer path 2. A movable base 43 supported on a guide rail 41 laid on the surface via wheels 42 and reciprocating in a direction orthogonal to the path direction of the work transfer path 2, and an elevating drive means 44 on the movable base 43. A lifting / lowering body 45 for opening and closing is provided. The raising / lowering drive means 44 is a conventionally known one comprising a cross link mechanism 46 for raising and lowering the opening / closing lifting body 45 in a horizontal posture with respect to the movable base 43 and a cylinder unit 47 for driving the cross link mechanism 46 up and down. However, the present invention is not limited to this. As travel driving means for reciprocating the movable table 43, although not shown, the movable table 43 is pushed by a cylinder unit interposed between the floor side and a train system that rotationally drives the wheels 42. Any system such as a pulling drive system, a rack-and-pinion gear system that reciprocally moves the movable base 43 by rotating the pinion gear using the rack gear (or pinion gear) on the floor side and the pinion gear (or rack gear) on the movable base 43 side. But it ’s okay.

  A pair of support rail members 48b for supporting the pair of left and right first supported portions 17a and 17b of the work suspension base 15 for suspending the work W are installed on the left and right side frames 48a on the upper side of the opening / closing lifting body 45. A workpiece support means 49 is provided, and the workpiece W supported on the opening / closing lifting body 45 via the workpiece suspension base 15 is suspended upward from the opening / closing lifting body 45. is doing. The left and right side frames 48a are connected by the connecting frame 48c at a position that does not interfere with the work suspension base 15 and the work W suspended by the work suspension base 15 when the work suspension base 15 is transferred from the work transfer path 2 side. They are connected and integrated with each other.

  The heat treatment furnace 40 has a lower open structure having an opening 51 in the floor 50, and the floor 50 is provided with a horizontally long hot air supply port 52 that opens on the side surface of the opening 51. A horizontally long exhaust port 53 for collecting hot air from the upper part of the furnace 40 is provided, and a heating means 55 and a hot air circulation blower 56 are interposed in a hot air circulation path 54 extending from the exhaust port 53 to the hot air supply port 52. A controller 57 for controlling the heating means 55 and the hot air circulating blower 56 is provided. The opening 51 of the heat treatment hearth 50 is of a size that allows the opening / closing lifting body 45 to move up and down without difficulty.

  When the opening / closing lifting body 45 is lifted by the lifting / lowering drive means 44, the movable platform 43 is inserted into the opening 51 of the heat treatment furnace floor 50 as shown in FIG. The first position P1 at which the opening 51 can be closed and the workpiece transfer means 10 of the transport traveling body 1 with respect to the workpiece support means 49 (support rail member 48b) on the opening / closing lifting body 45 as shown in FIG. 12 is configured to be able to reciprocate on the guide rail 41 with respect to the second position P2 at which the work suspension base 15 can be loaded and unloaded, and the lift drive means 44 of the open / close lift 45 is shown in FIG. Thus, the opening / closing lifting body 45 descends into the work relay booth 39 from the opening 51 of the heat treatment furnace floor 50 and travels for conveyance with respect to the work support means 49 (support rail member 48b) on the opening / closing lifting body 45. The workpiece transfer lowering position at which one workpiece transfer means 10 can load and unload the workpiece suspension base 15 and the opening / closing lifting body 45 enter the opening 51 of the heat treatment furnace floor portion 50 to open / close the workpiece. The lifting / lowering body 45 for opening / closing with respect to the movable base 43 between the lift limit position where the work W supported by the work support means 49 on the lifting body 45 via the work suspension base 15 enters the heat treatment furnace 40. Is moved up and down.

  Thus, the opening / closing lifting body 45 is inserted into the opening 51 of the heat treatment hearth 50 and closed when the opening 51 is closed as shown in FIG. A duct space 58 that communicates with the hot air supply port 52 on the furnace 40 side is provided inside, and a hot air spray floor plate portion 59 that includes a number of openings that communicate with the duct space 58 and inject hot air upward is provided. .

  As shown in FIGS. 1 and 12, a plurality of specific work storage spaces 26a located directly opposite the first heat treatment apparatus 24 and the second heat treatment apparatus 25 in the work storage space 26a of the work temporary storage shelf 26 are cooled. The work storage space 26a is used as a work cooling booth 61 by disposing the air injection nozzle pipe 60 at a position that does not interfere with the work W to be stored and stored and the work suspension base 15 for hanging the work W. . A blower 62 supplies cooling air to the cooling air injection nozzle pipe 60. Any means for supplying cooling air into the work cooling booth 61 may be used. For example, an appropriate position around the work storage space 26a used as the work cooling booth 61, for example, a position that does not interfere with the work W and the work suspension base 15 that suspends the work W in the middle of the two work storage spaces 26a adjacent to each other vertically. In addition, the work cooling booth 61 can be configured with a simple configuration in which a fan that discharges air toward the upper (or lower) work storage space 26a is provided. Of course, the number and arrangement of the work storage spaces 26a used as the work cooling booth 61 are not limited to the illustrated example. For example, when the work cooling booth 61 is configured by disposing a fan that discharges air upward at the bottom of the work storage space 26a, the first heat treatment apparatus 24 and the second heat treatment apparatus 25 are directly opposite in plan view (FIG. 1). And the second work storage space 26a that is in the second step from the bottom in the side view (FIG. 12) and that is parallel to the traveling direction of the transport traveling body 1 is used as the work cooling booth 61. Can do.

  The use method of the coating line configured as described above will be described. When the work suspension rack 15 is unloaded from the work storage space 26a to be loaded and unloaded in the work temporary storage shelf 26 to the traveling body 1 for conveyance. Stops the transport traveling body 1 at a position facing the work storage space 26a to be unloaded, lifts the lifting carriage 9 and moves the workpiece transfer means 10 (running fork 11) to the work storage space to be unloaded. Stop at the delivery level for 26a. In this state, by moving the running fork 11 to the advance limit position, the final stage fork portion 14 is suspended by the support rail members 27a and 27b in the work storage space 26a. The workpiece suspension base supported by the final-stage fork portion 14 by being inserted into the two supported portions 18a and 18b and then being lifted by a predetermined height of the lifting carriage 9 and being pulled into the home position of the running fork 11 15 may be pulled in from the work storage space 26a to the lifting carriage 9 side while being slightly lifted from the support rail members 27a and 27b in the work storage space 26a. On the other hand, when the work suspending mount 15 is moved into the work storage space 26a from the transporting traveling body 1 side, the transporting traveling body 1 is stopped at a position facing the work storage space 26a to be stored. Then, the lifting carriage 9 is moved up and down to stop the workpiece transfer means 10 (running fork 11) at the loading level with respect to the workpiece storage space 26a to be loaded. In this state, the running fork 11 that suspends the work suspension base 15 at the final stage fork portion 14 inserted into the second supported parts 18a and 18b of the work suspension base 15 is moved from the home position to the advance limit position. Then, the first supported portions 17a and 17b of the work suspension base 15 are moved to a work storage space by lowering the lifting carriage 9 by a predetermined height and pulling the running fork 11 into the home position. What is necessary is just to mount on the support rail members 27a and 27b in 26a.

  In addition, the work suspension between any one of the first work loading / unloading booths 19 and 20, the painting booth 21, the pretreatment booth 22, the water washing booth 23, the first heat treatment device 24, and the second heat treatment device 25 and the transport traveling body 1. Transfer of the lowering pedestal 15 also requires the above-described loading / unloading operation only when the advancing direction of the running fork 11 with respect to the lifting carriage 9 on the transport traveling body 1 side is opposite to the side where the work temporary storage shelf 26 is located. This is performed in the same manner as the transfer of the work suspension base 15 between the target work storage space 26a and the traveling body 1 for conveyance. As shown in FIG. 4, the advancing limit position when the running fork 11 moves in the left and right directions, that is, the work hanging platform loading / unloading positions XR and XL as viewed from the transport traveling body 1 are on the left or right side. Even when advancing, it is a position that is the same fixed distance away from the center of the transporting traveling body 1 (the center position in the width direction of the work transporting path 2), and the work suspension loading / unloading position on the work temporary storage shelf 26 side. XR is substantially the center position in the depth direction in the work storage space 26a.

  Hereinafter, the method of using the coating equipment having the above-described configuration will be described in detail. In order to perform the work of suspending the workpiece W on the workpiece suspension base 15, the first workpiece in which the empty workpiece suspension base 15 is empty is used. The unloading booth 19 or the second workpiece unloading booth 20 is prepared. That is, when the empty work suspension base 15 is stored and stored using the specific work storage space 26 a of the temporary work storage shelf 26, the empty work suspension 1 is used to transfer the empty work suspension 1. The work platform 15 is delivered to the first work unloading booth 19 or the second work unloading booth 20, and the work suspension platform 15 left empty in the first work unloading booth 19 or the second work unloading booth 20 is provided. In some cases, the empty work suspension base 15 can be used.

  For example, the empty work suspension platform 15 delivered in the first work unloading booth 19 by the transport traveling body 1 is, as shown in FIG. 5, the work suspension mount unloading position XL as viewed from the transport traveling body 1. Since the first supported portions 17a and 17b are lowered to be placed on the chain conveyors 29a and 29b of the conveying means 28, the chain conveyors 29a and 29b are operated and the platform hanging position for lifting the workpiece XL The empty work suspension platform 15 is unloaded at the first work piece and conveyed in a direction away from the work conveyance path 2 to the work position Y1 which is substantially the center in the depth direction of the booth 19. As a result, the work W can be easily suspended from the empty work suspension base 15 using the wide space around the entire empty work suspension base 15. The workpiece suspension platform 15 from which the workpiece W is suspended is transported to the workpiece suspension platform unloading position XL of the original transporting traveling body 1 by operating the chain conveyors 29a and 29b in the opposite directions again. .

  For example, if the workpiece W suspended on the workpiece suspension platform 15 (hereinafter simply referred to as workpiece W) is prepared at the workpiece suspension platform unloading position XL of the first workpiece unloading booth 19 as described above, This is transported to the pretreatment booth 22 by the transport traveling body 1. If it is a work W that does not require degreasing and cleaning with the degreasing chemical solution in the pretreatment booth 22 and only requires water washing, it is transported to the water washing booth 23. When the workpiece W is loaded into the pretreatment booth 22 or the washing booth 23, the opening / closing shutter 35 shown in FIGS. In a state where the first supported portions 17a and 17b of the work suspension base 15 are placed thereon, the work W is lowered at the work suspension base unloading position XL as viewed from the transport traveling body 1. After this (after the running fork 11 is pulled into the home position), the open / close shutter 35 is closed and the chain conveyors 29a and 29b are operated so that the workpiece suspension platform 15 in the workpiece suspension platform loading / unloading position XL is removed. The pretreatment booth 22 or the washing booth 23 is transported in the direction away from the work transport path 2 to the work position Y2 which is substantially the center in the depth direction. As a result, the workpiece W suspended on the workpiece suspension base 15 suitably corresponds to the nozzle-equipped piping 38 included in the pretreatment booth 22 or the flush booth 23. A treatment liquid (degreasing chemical solution) or washing water can be supplied, and the desired pretreatment or washing with respect to the workpiece W can be suitably performed.

  The workpiece W that has been pre-treated in the pre-treatment booth 22 or rinsed in the water washing booth 23 is operated again in the reverse direction by moving the chain conveyors 29a and 29b in the reverse direction, and is viewed from the original transporting traveling body 1 from the work position Y2. Then, the workpiece is transferred to the loading / unloading position XL for lifting the workpiece, and after opening the opening / closing shutter 35, the workpiece is taken out by the transfer traveling body 1 and transferred to the next booth. That is, the work W that has been pretreated in the pretreatment booth 22 is transported to the washing booth 23 and washed with water, and the work W that has been washed in the washing booth 23 is divided into the first heat treatment device 24 and the second heat treatment device. 25, it can be carried into, for example, the first heat treatment device 24 in an empty state and drained and dried.

  The first heat treatment apparatus 24 will be described as an example. In the first heat treatment apparatus 24 into which the work W is carried, the movable platform 43 of the work relay booth 39 is opened and closed by an elevating drive means 44 as shown in FIG. In a state where 45 is lowered to the lower limit position, the workpiece transfer means 10 of the transport traveling body 1 is moved to the second position P2 where the workpiece suspension base 15 can be loaded and unloaded, and is kept waiting. At this time, the opening 51 of the heat treatment furnace floor 50 is in an open state, but the heating means 55 and the hot air circulation blower 56 are operated as appropriate so that the exhaust port passes through the heat treatment furnace 40 from the hot air supply port 52. It is possible to form a flow of hot air reaching 53 and keep the atmosphere in the heat treatment furnace 40 at a predetermined standby temperature.

  Thus, the work W taken out from the washing booth 23 by the transport traveling body 1 is waiting at the second position P2 in the work relay booth 39 of the first heat treatment apparatus 24 by the transport traveling body 1. The first supported portions 17a and 17b of the work suspension base 15 that suspends the work W are attached to the work support means 49 on the open / close lifting body 45 located on the movable base 43 and in the lower limit position. In a state of being placed on the support rail member 48b of the work support means 49, as shown in FIG. 12, the work can be transferred at the work suspension platform loading / unloading position XL as viewed from the transport traveling body 1. Next, as shown in FIG. 14, the movable platform 43 is moved from the second position P2 to the first position P1, and then the elevation drive means 44 on the movable platform 43 is operated to raise and lower the opening / closing lifting body 45. Raise to position. As a result, the opening / closing lifting body 45 enters the opening 51 of the heat treatment furnace floor 50, the opening / closing lifting body 45 is closed, and the work support means on the opening / closing lifting body 45 is closed. The workpiece W in a state suspended by the workpiece suspension platform 15 at 49 is inserted into the heat treatment furnace 40.

  When the workpiece W is inserted into the heat treatment furnace 40, the heating means 55 and the hot air circulation blower 56 are automatically operated according to a draining and drying program set in advance by the controller 57, and are sent from the hot air supply port 52. The hot air having a temperature and a predetermined amount of air is passed through the duct space 58 in the opening / closing lifting body 45 and heat-treated from the hot air spraying floor plate portion 59 of the opening / closing lifting body 45, which corresponds to the bottom surface of the heat treatment furnace 40. The hot air flowing into the furnace 40 and the flow of hot air reaching the exhaust port 53 is formed in the heat treatment furnace 40 for a predetermined time, thereby draining and drying the work W suspended in the air in the heat treatment furnace 40. Can be done.

  In the illustrated embodiment, as shown in FIG. 12, the transporting traveling body 1 is placed on the work support means 49 on the open / close lifting body 45 on the movable platform 43 at the second position P2 and at the lower limit position. The workpiece suspension platform 15 (work W) transferred from the position is shifted from the center line of the movable platform 43 (opening / closing lift 45) toward the workpiece transport path 2 side. Therefore, in this embodiment, as shown in FIG. 14, the movable base 43 is arranged so that the workpiece W loaded into the heat treatment furnace 40 by the ascending / descending lift 45 is located at the approximate center in the heat treatment furnace 40. The first position P <b> 1 is set so as to be shifted to the far side from the workpiece transfer path 2 with respect to the center line of the heat treatment furnace 40.

  When draining and drying for a predetermined time is completed, the opening / closing lifting body 45 is lowered to the lower limit position so that the work W is escaped from the heat treatment furnace 40 to the lower work relay booth 39 through the opening 51 and the movable platform 43 is moved. The workpiece suspension is moved from the first position P1 to the second position P2, and the workpiece W (work suspension platform 15) supported by the workpiece support means 49 on the opening / closing lifting body 45 is viewed from the transport traveling body 1. By returning to the lowering platform loading and unloading position XL, the drained and dried work W can be received by the transporting traveling body 1 and transported to the coating booth 21 for coating in the next step.

  Also in the painting booth 21, as shown in FIGS. 8 and 9, the workpiece W is placed on the chain conveyors 29 a and 29 b of the conveying means 34 on the first conveyor of the workpiece suspension base 15 with the opening / closing shutter 32 opened. When the support portions 17a and 17b are placed, the workpiece hanging platform loading / unloading position XL as viewed from the transport traveling body 1 is lowered. After this (after the running fork 11 is pulled into the home position), the open / close shutter 32 is closed and the chain conveyors 29a and 29b are operated so that the workpiece suspension platform 15 in the workpiece suspension platform loading / unloading position XL is removed. The paint booth 21 is transported in a direction away from the work transport path 2 to a work position Y3 that is substantially in the center in the depth direction. As a result, since the workpiece W is suspended at a substantially central position of the painting booth 21, a sufficient work space is secured around the workpiece W. For example, even in a manual painting operation using a spray gun, The painting operation can be performed easily and satisfactorily.

  The finished work W is transported again from the work position Y3 to the work suspension platform loading / unloading position XL as viewed from the original transporting body 1 by operating the chain conveyors 29a and 29b in the opposite direction. After the shutter 32 is opened, it can be taken out by the transport traveling body 1 and transported to the booth in the next stage process. That is, the workpiece W that has been painted is carried into the empty first heat treatment device 24 of the first heat treatment device 24 and the second heat treatment device 25, for example, and coating film drying or coating film drying and baking are continuously performed. Processing can be performed. For the heat treatment, the work W is transported by the transporting traveling body 1 and charged into the heat treatment furnace 40 of the first heat treatment apparatus 24 or the second heat treatment apparatus 25 and the heat-treated work W is transported by the transporting traveling body 1. The procedure of receiving is the same as the procedure at the time of carrying out the draining and drying process described above, and thus the description thereof is omitted. The heat treatment in the heat treatment furnace 40 is performed by selecting and executing a target heat treatment program from a coating film drying program and a coating film drying baking process continuous program set in advance in the controller 57, and thereby for heating means 55 and hot air circulation. The blower 56 is automatically operated, and a desired heat treatment is performed.

  In addition, the workpiece | work W in which the coating completed and the coating-film drying process by the coating-film drying program in the 1st heat processing apparatus 24 or the 2nd heat processing apparatus 25 were complete | finished are the empty work storage space of the workpiece | work temporary storage shelf 26. After moving to 26a and leaving it for a required time, it is sent to the first heat treatment apparatus 24 or the second heat treatment apparatus 25, and only the baking process is performed on the workpiece W by selecting and executing the baking process program set in the controller 57. It is also possible.

  The workpiece W that has been heat-treated can be stored in the vacant workpiece storage space 26a in the workpiece temporary storage shelf 26 by the transporting traveling body 1 and naturally cooled, but when forced cooling is required, The workpiece W is housed in a workpiece storage space 26a serving as a workpiece cooling booth 61 located opposite to the first heat treatment apparatus 24 or the second heat treatment apparatus 25, and a blower 62 connected to the workpiece cooling booth 61 is operated for cooling. The work W stored in the work cooling booth 61 can be forcibly cooled by jetting cooling air from the air jet nozzle pipe 60. At this time, since the work storage space 26a as the work cooling booth 61 is disposed at a position opposite to the first heat treatment apparatus 24 and the second heat treatment apparatus 25, the heat treatment can be efficiently performed without causing the transport traveling body 1 to travel almost. The finished work W can be transferred to the work storage space 26a as the work cooling booth 61. In particular, as in the work cooling booth 61 illustrated by phantom lines in FIG. 1, the center position in the plan view is directly opposite to the first heat treatment device 24 and the second heat treatment device 25. If the work cooling booth 61 is arranged so as to coincide with each of the second heat treatment devices 25, the work W after the heat treatment can be transferred to the work cooling booth 61 without running the transporting traveling body 1 at all. . Further, as shown in FIG. 12, the workpiece suspension platform 15 is lifted and retracted by the running fork 11 of the transport traveling body 1 directly opposite to the workpiece relay booth 39 of the first heat treatment device 24 and the second heat treatment device 25. It is also possible to provide a work storage space 26a as a work cooling booth 61 in which the heat-treated work W can be transferred only by a series of operations of sending and lowering to the opposite side.

  The workpiece W stored and stored in the workpiece temporary storage shelf 26 after the cooling time has passed is delivered to the first workpiece loading / unloading booth 19 or the second workpiece loading / unloading booth 20 by the transporting traveling body 1, and these workpiece loading / unloading booth 19. , 20, the workpiece W can be removed from the workpiece suspension base 15 moved to the work position Y1 and carried out.

  In the illustrated embodiment, it has been described that an operator enters the painting booth 21 and performs the painting operation manually. However, a painting robot or the like is provided in the painting booth 21 so that painting is performed automatically. It can also be configured to be performed. In this case, the work loading / unloading booths 19 and 20, the pretreatment booth 22, the water washing booth 23, the painting booth 21, and the heat treatment devices 24 and 25 can be arranged in this order in parallel. When an operator enters the facility 21 to perform painting work manually, the work loading / unloading booths 19 and 20, the painting booth 21, the washing booth 23, the pretreatment booth 22, and the heat treatment devices 24 and 25 are used. The booths in which the workers are involved can be arranged adjacently in order to facilitate linkage between the workers, and the length of the transport path of the workpiece W when the pretreatment process is unnecessary can be shortened.

  In the above embodiment, the heat treatment apparatus of the present invention is incorporated in the painting line, but only the heat treatment apparatus of the present invention can be independently installed and used. Further, a heat ray irradiation type such as an infrared lamp can be used as a heating means in the heat treatment furnace.

It is a schematic plan view of the whole coating line which shows one Embodiment of this invention. It is a side view of the traveling body for conveyance which conveys a workpiece | work. It is a front view which shows the storage storage state of the workpiece | work in a workpiece | work temporary storage shelf. It is a vertical front view explaining the workpiece transfer means of the traveling body for conveyance. It is a top view which shows a work loading / unloading booth. It is a rear view which shows the work loading / unloading booth. It is a vertical side view which shows the work loading / unloading booth and the traveling body for conveyance. It is a vertical side view which shows a coating booth and a traveling body for conveyance. It is a cross-sectional top view which shows the painting booth. It is a vertical side view which shows a pre-processing booth or a water washing booth, and a traveling body for conveyance. It is a cross-sectional top view which shows a pretreatment booth and a flush booth. It is a vertical side view which shows a heat processing apparatus, the traveling body for conveyance, and a workpiece | work cooling booth. It is a vertical front view which shows a heat processing apparatus. It is a vertical side view which shows the heat processing apparatus of the state in which the workpiece | work was inserted. It is a vertical front view which shows the heat processing apparatus in the state in which the workpiece | work was inserted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer traveling body 2 Work conveyance path 9 Lifting carriage 10 Work transfer means 11 Running fork 15 Work suspension bases 17a, 17b First supported parts 18a, 18b Second supported parts 19 First work loading / unloading booth 20 Two-work loading / unloading booth 21 Painting booth 22 Pretreatment booth 23 Flushing booth 24 First heat treatment device 25 Second heat treatment device 26 Work temporary storage shelves 28, 34, 37 Transport means 29a, 29b Chain conveyor 32, 35 Opening / closing shutter 39 Work relay booth 40 Heat treatment furnace 43 Movable stage 44 Elevating drive means 45 Opening / closing elevating body 46 Cross link mechanism 47 Cylinder unit 48b Support rail member 49 Work support means 51 Opening 52 Hot air supply port 53 Exhaust port 54 Hot air circulation path 55 Heating means 56 Hot air Circulating blower 57 Roller 58 duct space 59 hot air floor portion 60 for cooling air ejection nozzle pipe 61 workpiece cooling booth 62 Blower W workpiece (object to be coated)

Claims (4)

  Lower open heat treatment furnace, heating means in the heat treatment furnace, open / close lifting body for closing the lower release part of the heat treatment furnace, rising limit position for closing the lower release part of the heat treatment furnace and heat treatment Elevating drive means for moving up and down in parallel with the lower limit position lowered below the furnace, and work support means provided on the opening / closing lift body, and supporting the work of the opening / closing lift body at the lower limit position The heat processing apparatus comprised so that the workpiece transferred to the means could be loaded in a heat processing furnace by the raising to the raising limit position of the raising / lowering body for opening and closing.   The opening / closing lift body is provided with a duct space and a hot-air spray floor plate portion communicating with the duct space, and when the opening / closing lift body is in the ascending limit position, the hot air supply port communicating with the duct space of the opening / closing lift body The heat treatment apparatus according to claim 1, wherein an exhaust port is provided in an upper portion of the heat treatment furnace, and the heating unit is configured to supply hot air to the hot air supply port.   The opening / closing lifting body is mounted on a movable base movable on the lower floor of the heat treatment furnace so that the opening / closing body can be lifted and closed. A reciprocating movement is configured between a first position where the workpiece can be moved and a second position for transferring the workpiece between the workpiece support means on the lifting and lowering body at the lower limit position. Or the heat processing apparatus of 2.   The workpiece is suspended from a workpiece suspension platform having supported portions on both sides, and the workpiece support means includes a pair of support rail members that support the supported portions on both sides of the workpiece suspension platform. The heat processing apparatus of any one of Claims 1-3 comprised so that the workpiece | work supported by the workpiece | work support means via the mount could be suspended away from the raising / lowering body for opening / closing.

Images