JP4761073B2 - Heat treatment equipment on the painting line - Google Patents

Description

  The present invention relates to a heat treatment facility for drying a painted surface of a workpiece that has been pretreated such as washing with water or drying / baking a painted surface of a workpiece after painting on a coating line.

As described in Patent Document 1, as a heat treatment facility for drying a painted surface of a workpiece that has been pretreated such as washing with water or drying / baking a painted surface of a workpiece after painting on a painting line, A draining and drying oven and a baking drying oven are installed side by side on the workpiece conveyance path, and the workpiece to be drained and dried is conveyed to the draining and drying oven by a conveyance traveling body that runs along the workpiece conveyance path, and baking drying is performed. A necessary work is known that is configured to be transported and charged into a baking and drying furnace by the transporting traveling body.
JP-A-11-10056

  In the conventional heat treatment equipment on the painting line as described above, the draining and drying furnace is operated in accordance with a heat treatment program dedicated to draining and drying, and the baking drying furnace is operated in accordance with a heat treatment program dedicated to baking and drying. If the time required for the drying process is not the same, and the time required for the baking drying process is set longer than the time required for the draining drying process, the workpiece sent from the draining drying process to the baking drying process after finishing the painting process, It is necessary to wait in a temporary work storage shelf or the like until the baking / drying furnace becomes empty, which reduces efficiency. In order to eliminate such a situation, a plurality of baking / drying furnaces must be provided, which greatly increases the equipment cost.

The object of the present invention is to provide a heat treatment facility on a coating line that can solve the above-mentioned conventional problems. In the invention according to claim 1, reference numerals of embodiments to be described later are provided. When a plurality of heat treatment devices 24 and 25 are disposed along the workpiece conveyance path 2 on the side of the workpiece conveyance path 2 of the coating line, the conveyance traveling body 1 traveling on the workpiece conveyance path 2 is shown. Is a heat treatment facility on the coating line provided with the workpiece transfer means 10 capable of transferring the workpiece W between the heat treatment devices 24 and 25, and the heating provided in the heat treatment furnace 40 of each heat treatment device 24 and 25. Each means (hot air circulation path 54, air heating burner 55, hot air circulation blower 56) includes at least two heat treatment programs, a draining drying program 57a and a film baking / drying program 57c. Constant has been heating control means (controller 57) is juxtaposed, the draining drying program 57a controls the heating means, the flow of hot air at suitable predetermined temperature draining drying, a predetermined time the heat treatment furnace 40 The coating film baking / drying program 57c controls the heating means so that a flow of hot air having a predetermined temperature suitable for the coating film baking / drying process is generated in the heat treatment furnace 40 for a predetermined time. It is a program to be formed, and is configured so that the water draining drying process or the coating film baking drying process under the same conditions can be performed in any of the heat treatment apparatuses 24 and 25.

In carrying out the present invention with the above configuration, specifically, as described in claim 2, the heat treatment program controls the heating means to forcibly dry the coating film at a temperature higher than the coating film drying at normal temperature. A coating film high temperature drying program 57b for forming a flow of hot air having a predetermined temperature suitable for the coating high temperature drying process to be performed in the heat treatment furnace 40 for a predetermined time can be provided as an option.

  According to the heat treatment facility on the painting line according to the present invention, the draining and drying treatment or baking under the same conditions is performed in each of the plurality of heat treatment apparatuses disposed along the workpiece conveyance path along the workpiece conveyance path of the painting line. Because the drying process can be performed selectively, the time required for the draining drying process and the baking drying process are not the same, and the time required for the baking drying process is set longer than the time required for the draining drying process. The work to be sent to the baking drying process after finishing the coating process from the drying process for draining during the pretreatment is transported and charged into an available heat treatment apparatus among a plurality of heat treatment apparatuses. It can be subjected to a baking and drying process. Therefore, there is no need to wait until the heat treatment apparatus that performs the baking and drying process becomes empty until the entire process until baking and drying is completed, and the entire process is efficiently performed. be able to. Of course, it is only necessary to install a minimum number of heat treatment apparatuses, and the equipment cost can be reduced.

  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 table 43 by rotating the pinion gear using the floor side rack gear (or pinion gear) and the pinion gear (or rack gear) on the movable platform 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 an air heating burner 55 and a hot air circulation blower 56 are provided 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 air heating burner 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.

  As shown in the flowchart of FIG. 16, the controller 57 of the first heat treatment apparatus 24 and the controller 57 of the second heat treatment apparatus 25 each have a draining drying program 57a having the same setting conditions, and forced drying of the coating film at a temperature higher than normal temperature. Are set, and a baking drying program 57c for baking and drying the coating film at a high temperature is set. Accordingly, in both the first heat treatment apparatus 24 and the second heat treatment apparatus 25, by selectively executing the heat treatment program set in the controller 57, the draining drying process, the coating film high temperature drying process, and the coating film are performed under the same conditions. A baking drying process can be carried out.

  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. Then, the first supported parts 17a and 17b are lowered to be placed on the chain conveyors 29a and 29b of the conveying means 28. Therefore, 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 work suspension base 15 from which the work W is suspended is transported to the workpiece suspension base unloading position XL of the original transport traveling body 1 by operating the chain conveyors 29a and 29b in the opposite direction 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 the work W does not require degreasing and cleaning with the degreasing chemical solution in the pretreatment booth 22 and only requires water washing, the work W is conveyed to the water washing booth 23. When the workpiece W is carried into the pretreatment booth 22 or the washing booth 23, the opening / closing shutter 35 shown in FIGS. 10 and 11 is opened, and the chain conveyors 29a and 29b of the conveying means 37 provided in the pretreatment booth 22 and the washing booth 23 are opened. 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 opening / closing shutter 35 is closed and the chain conveyors 29a and 29b are operated so that the workpiece suspension platform 15 at 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 work W suspended on the work suspension base 15 suitably corresponds to the nozzle-equipped pipe 38 provided in the pretreatment booth 22 or the water washing 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 hanging the workpiece, and the opening / closing shutter 35 is opened. 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. It is possible to carry out the draining and drying process by loading it into an available heat treatment apparatus.

  That is, as shown in the flowchart of FIG. 16, when the heat treatment process for the workpiece W is started, it is searched which of the first heat treatment apparatus 24 and the second heat treatment apparatus 25 is available (S1, S2), and the available heat treatment apparatus The traveling body 1 for conveyance carries in the workpiece | work W (S3, S4). If both heat treatment apparatuses are not vacant, the transport traveling body 1 can store the workpiece W in the vacant workpiece storage space 26a of the workpiece temporary storage shelf 26 and temporarily store it (S5). The first heat treatment device 24 and the second heat treatment device 25 may wait in the pre-process booth until either one becomes available.

  The case where the workpiece W is loaded into the first heat treatment apparatus 24 will be described as an example. In the first heat treatment apparatus 24 into which the workpiece W is loaded, the movable platform 43 of the workpiece relay booth 39 is moved up and down as shown in FIG. In a state where the opening / closing lifting body 45 is lowered to the lower limit position by the driving means 44, 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. Let me stand by. At this time, the opening 51 of the heat treatment furnace floor 50 is in an open state, but the air heating burner 55 and the hot air circulation blower 56 are actuated appropriately to pass through the heat treatment furnace 40 from the hot air supply port 52. A flow of hot air reaching the exhaust port 53 is formed, and the atmosphere in the heat treatment furnace 40 can be maintained 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.

  If the workpiece W is inserted into the heat treatment furnace 40, the controller 57 selects a draining / drying program 57a from preset heat treatment programs 57a to 57c (S6), and the air heating is performed according to the draining / drying program 57a. The burner 55 and the hot air circulation blower 56 are automatically operated (S7). As a result, the hot air of a predetermined temperature sent from the hot air supply port 52 passes through the duct space 58 in the opening / closing lifting body 45 and the hot air of the opening / closing lifting body 45 corresponding to the bottom surface of the heat treatment furnace 40. By feeding the spray floor plate portion 59 into the heat treatment furnace 40 in an upward plane shape and forming a flow of hot air at a predetermined temperature suitable for draining and drying processing reaching the exhaust port 53 in the heat treatment furnace 40 for a predetermined time, It is possible to automatically perform the draining and drying process on the workpiece W suspended in the air in the heat treatment furnace 40. When the second heat treatment apparatus 25 is available and the workpiece W is loaded into the second heat treatment apparatus 25, the controller 57 provided in the second heat treatment apparatus 25 uses the same draining and drying program as the draining and drying program 57a executed in the first heat treatment apparatus 24. 57a is executed, and the same draining and drying process can be automatically performed on the workpiece W carried into the second heat treatment apparatus 25 (S4, S8, S9).

  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 the draining and drying process for a predetermined time is completed in accordance with the draining and drying program 57a (S10, S11), the opening / closing lifting body 45 is lowered to the lower limit position, and the workpiece W is relayed downward from the heat treatment furnace 40 through the opening 51. The booth 39 is allowed to escape, and the movable platform 43 is moved from the first position P1 to the second position P2, and the workpiece W supported by the workpiece support means 49 on the opening / closing body 45 (work suspension platform 15). 17 is returned to the loading / unloading position XL for hanging the work as viewed from the traveling body 1, so that the drained and dried workpiece W is received by the traveling body 1, and as shown in the flowchart of FIG. It can be carried into the painting booth 21 in order to perform the coating in the step process (S12, S13).

  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, when the coated workpiece W needs to be dried at a high temperature, or at a higher temperature, rather than room temperature drying, the first heat treatment device 24 and the second heat treatment device 25 are in an empty state, for example, It can carry in to the one heat processing apparatus 24, and can perform a coating-film high temperature drying process or a baking drying process. 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. Thus, the heat treatment in the heat treatment furnace 40 of the first heat treatment apparatus 24 or the second heat treatment apparatus 25 is performed by the coating film high temperature drying program by the heat treatment program selection step (S6, S8) in the controller 57 shown in the flowchart of FIG. The air heating burner 55 and the hot air circulating blower 56 are automatically operated in accordance with one heat treatment program selected from the 57b and the coating film baking and drying program 57c (S7, S9), and the desired heat treatment is performed. . That is, the heat treatment is automatically performed by supplying hot air having a temperature suitable for the coating film high temperature drying process or the coating film baking drying process to the heat treatment furnace 40 for a predetermined time.

  In addition, the coated workpiece | work W which may be dried at normal temperature, and the workpiece | work W which the coating-film high temperature drying process or coating-film baking drying process completed in the 1st heat processing apparatus 24 or the 2nd heat processing apparatus 25 are the empty states of the workpiece | work temporary storage shelf 26 In the workpiece storage space 26a (S14, S15 in FIG. 17), in the case of a coated workpiece W that may be dried at room temperature, it is stored at least until the room temperature drying of the workpiece is completed. It can be stored at least until the workpiece is cooled to room temperature. In addition, the workpiece W that has undergone the coating film high-temperature drying process or the coating baking process in the first heat treatment apparatus 24 or the second heat treatment apparatus 25 is carried into the workpiece cooling booth 61 of the workpiece temporary storage shelf 26 for forced cooling. (S14 and S16 in FIG. 17).

  That is, the work W that requires forced cooling is transferred into the work storage space 26 a as the work cooling booth 61 located opposite the first heat treatment apparatus 24 or the second heat treatment apparatus 25 and connected to the work cooling booth 61. The work W accommodated in the work cooling booth 61 can be forcibly cooled by operating the blower 62 and jetting cooling air from the cooling 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 workpieces W that have been stored and stored in the workpiece temporary storage shelves 26 and finished at the entire painting process are delivered to the first workpiece unloading booth 19 or the second workpiece unloading booth 20 by the transporting traveling body 1, and these workpiece unloading booths 19 are loaded. , 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 addition, as a heating means in the heat treatment furnace, a heat ray irradiation type such as an infrared lamp can be used. In addition, the setting contents of the draining drying program 57a, the coating film high temperature drying program 57b, and the coating film baking drying program 57c exemplified in the above embodiment are changed according to the workpiece to be actually processed, the paint used, and the like. It can be adjusted. The contents of the heat treatment program are not particularly limited. For example, the heat treatment program starts when the workpiece W is inserted into the heat treatment furnace 40 while the heat treatment furnace 40 is maintained at a predetermined standby temperature. The heating means (the air heating burner 55 and the hot air circulation blower 56) are operated so as to raise the furnace temperature to the set temperature, and then the furnace temperature is maintained at the set temperature for a predetermined time. The heating means is operated, and when the set time has elapsed, the workpiece W is unloaded from the furnace, the furnace temperature is lowered to the standby temperature, and then the heating means is operated so as to maintain the furnace temperature at the standby temperature. . In addition, the heat treatment program is started from the time when the workpiece W is inserted into the heat treatment furnace 40, the set time elapses while maintaining the furnace temperature at the set preheating temperature, and then the furnace temperature is raised to the set temperature. The heating means (the air heating burner 55 and the hot air circulation blower 56) can also be operated.

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. It is a flowchart explaining the first half of the procedure of heat processing. It is a flowchart explaining the second half of the procedure of heat processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transfer 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 Air heating burner 56 Blower for circulating hot air -57 Controller 58 Duct space 59 Hot air spray floor plate section 60 Cooling air spray nozzle pipe 61 Work cooling booth 62 Blower W Work (workpiece)

Claims (2)

A plurality of heat treatment apparatuses are arranged along the workpiece conveyance path along the workpiece conveyance path of the coating line, and a workpiece can be transferred to and from each heat treatment apparatus on a conveyance traveling body that runs on the workpiece conveyance path. The heat treatment equipment on the coating line provided with the workpiece transfer means, and the heat treatment means provided in the heat treatment furnace of each heat treatment apparatus is set with at least two heat treatment programs, a draining drying program and a coating baking drying program, respectively. Heating control means is also provided, the draining and drying program is a program for controlling the heating means to form a flow of hot air having a predetermined temperature suitable for draining and drying processing in the heat treatment furnace for a predetermined time, The coating film baking / drying program controls the heating means so that a flow of hot air having a predetermined temperature suitable for the coating film baking / drying process is performed for a predetermined time. A program for forming into the heat treatment furnace, draining drying or coating baking and drying treatment of the same conditions is configured to perform in either of the heat treatment apparatus, heat treatment equipment on coating line. In the heat treatment program, the heating means is controlled so that a flow of hot air at a predetermined temperature suitable for a coating high temperature drying process for forcibly drying the coating at a temperature higher than the coating film normal temperature drying is performed for a predetermined time. The heat treatment equipment on a coating line according to claim 1, wherein a coating film high-temperature drying program formed therein is provided as an option.

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