JP7498904B2 - Workpiece transport device - Google Patents

Description

The present invention relates to a workpiece transport device for, for example, processing a workpiece.

Conventionally, before painting a workpiece such as a chassis part of an automobile or motorcycle, a pretreatment process is performed in which the workpiece is washed, dried, coated, or the like. The pretreatment process is performed, for example, on a continuously extending conveyor line. On the conveyor line, the workpiece is moved on the conveyor line while being hung from a hanger or the like, and is immersed in various dipping tanks, whereby the workpiece is washed, coated, or the like (see, for example, Patent Document 1).

JP 2004-338870 A

However, the above-mentioned conveying line requires a relatively large space because multiple workpieces are conveyed in a line and processes such as cleaning and coating are continuously performed on the line. In particular, this type of conveying line is usually installed in a straight line, which poses a major problem when it is necessary to secure the space within a factory.

The present invention has been devised in light of the above circumstances, and an object of the present invention is to provide a workpiece transport device having a novel configuration that is capable of processing workpieces in a small space.

A workpiece transport device provided by the present invention includes a base frame, a main body supported rotatably on the base frame, a plurality of arm members arranged to radiate from the main body in a plan view and supporting a plurality of workpieces, a rotation drive means for rotating the main body, a plurality of up-down movement means for independently moving the plurality of arm members up and down, and a control means for controlling the rotation drive means and the up-down movement means, wherein the control means rotates the main body using the rotation drive means to transport any one of the arm members to a position in a coating tank for coating each of the plurality of workpieces, and then controls the transported workpieces to be transported to a position in a coating tank for coating the workpieces by rotating the main body using the rotation drive means. The arm member is lowered by the up and down movement means, thereby immersing the workpiece supported by the arm member in the coating tank , and after the workpiece is immersed, the arm member is repeatedly and finely moved up and down to move the immersed workpiece up and down repeatedly and finely, and another arm member different from the arm member supporting another workpiece different from the workpiece immersed in the coating tank is transported to a next position in the cleaning tank for cleaning each of the multiple workpieces, and the other arm member is repeatedly and finely moved up and down by the up and down movement means to move the other workpiece up and down repeatedly and finely .

In the work transport device of the present invention, the main body has a ring-shaped rotatable ring member provided at its lower part, and the rotational drive means has a motor and a wheel that rotates when driven by the motor, the ring member and the wheel are in contact with each other's circumferential surfaces, and the ring member is rotationally driven by friction drive in which the driving force of the motor is transmitted by frictional force with the rotating wheel.

In the workpiece transport device of the present invention, the control means may rotate and stop the ring member by controlling the rotation of the motor.

In the work transport device of the present invention, the main body is provided with a plurality of guide rails extending in the vertical direction, the up-down movement means has an air cylinder and a frame member extending in the vertical direction which is moved up and down by the air cylinder while being guided by the guide rails, and the arm member is connected to the frame member so as to be freely movable up and down.

In the workpiece transport device of the present invention, the control means may control the air pressure supplied to the air cylinder to move the frame member up and down and also move the arm member up and down.

The workpiece transport device of the present invention may further comprise a positioning means for stopping the main body at a predetermined stop position.

According to the present invention, when the main body is rotated by the rotary drive unit, the arm members arranged to extend radially from the main body are rotated around the main body. The rotation, stopping, and vertical movement of each arm member are controlled by the control means. Therefore, if a cleaning tank, coating tank, or the like is installed at the stopping position of each arm member, the workpiece supported by each arm member can be immersed in the cleaning tank or the like.

In particular, when the arm member (workpiece) is repeatedly and finely moved up and down by the control means while the workpiece is immersed in the coating tank, air bubbles remaining on the surface of the workpiece can be removed, and adhesion of the treatment liquid to the surface of the workpiece can be promoted. Furthermore, when the workpiece is repeatedly and finely moved up and down, the treatment liquid circulates in the coating tank, further promoting adhesion of the treatment liquid, and thus the coating time can be shortened. Furthermore, when the workpiece is moved up and down after being immersed in the cleaning tank, water droplets remaining on the surface of the workpiece can be reliably removed. Furthermore, if the number of arm members, the rotation speed, etc. are appropriately set, the processing of the workpiece can be suitably performed. Therefore, in the present invention, the pre-processing process including cleaning of the workpiece can be performed around the main body, and the pre-processing process can be performed in a small space.

FIG. 1 is a front view showing a workpiece transport device according to an embodiment of the present invention. FIG. 2 is a plan view of the workpiece transport device shown in FIG. 6A and 6B are diagrams illustrating a positional relationship between a support roller and a ring member. FIG. 4 is an end view of the positioning dock, taken along line AA of FIG. 3 , showing a side view thereof; FIG. 2 is a diagram showing an internal configuration of the workpiece transport device shown in FIG. 1 . FIG. 4A and 4B show a part of an arm member and the outer shape of a frame member, in which FIG. 13 is a diagram showing the positional relationship between a first U-shaped rail of a guide arm and a second U-shaped rail of a guide frame. FIG. 1A and 1B show a friction drive device, in which FIG. FIG. 2 is a plan view showing an installation state of first to third limit switches. 1A and 1B show a clamp device, in which FIG. FIG. 2 is a block diagram showing an electrical configuration of the workpiece transport device.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view showing a workpiece transport device according to an embodiment of the present invention, and FIG. 2 is a plan view of the workpiece transport device.

The workpiece transport device 1 according to this embodiment is a device for transporting, while suspending, parts (hereinafter referred to as workpieces) of, for example, a passenger car or a motorcycle, and performing pre-treatment processes (e.g., cleaning, drying, coating, etc.) for painting in a plurality of areas. In particular, this workpiece transport device 1 transports, for example, a workpiece W along a predetermined circumference (see A in FIG. 2 ) in a rotation direction B.

The work transport device 1 is roughly divided into a base frame 2, a substantially cylindrical main body 3 rotatably supported on the upper part of the base frame 2, and a plurality of arm members 4 supported on the main body 3 so as to be capable of ascending and descending and capable of suspending the work W. In the work transport device 1 of this embodiment, as shown in FIG. 2, ten arm members 4 are arranged so as to spread out radially from the main body 3.

The above-mentioned multiple areas are set on the above-mentioned circumference A that is preset around the work transport device 1 (see E1 to E10 in FIG. 2). In these areas, for example, a cleaning tank, a coating tank, etc. (not shown) are provided. In this embodiment, for example, the work W is received in the area E1 in FIG. 2, various processes are performed in the areas E2 to E9, and the work W is unloaded in the area E10.

As shown in Fig. 2, the base frame 2 is configured by a frame body having a substantially rectangular shape in a plan view, and a substantially circular flat support part 5 is disposed in the center thereof (see Fig. 1). The support part 5 is connected to the base frame 2 via a plurality of connecting members (not shown) provided radially therefrom.

Approximately L-shaped brackets 6 are provided on three of the four sides of the base frame 2, and support rollers 7 are rotatably supported on the upper inside of each bracket 6. Each support roller 7 is for stably maintaining the rotational trajectory of a ring member 8, which will be described later.

The ring member 8 is formed in a ring shape and is supported by connecting the lower ends of a plurality of guide rails 18, which will be described later. As shown in Figures 3 and 4, the ring member 8 has a horizontal surface 9 and an outer circumferential surface 10 extending downward from its periphery, and the support rollers 7 roll on the outer circumferential surface 10. The horizontal surface 9 is also provided with a plurality of positioning docks 11 that come into contact with first to third limit switches 51 to 53, which will be described later.

The positioning docks 11 are provided in the same number (10) as the areas E1 to E10, and their main bodies 12 extend in a radially outward direction. A rod-shaped clamped portion 13 extending downward and vertically is formed on the inner side of the main body 12. The clamped portion 13 is used to determine the stop position of the arm member 4, and is clamped by a clamp device 54 described later. That is, by clamping the clamped portion 13, the rotation of the ring member 8 (main body portion 3) is stopped, and at the same time, the arm member 4 stops. This stop position is the stop position of the workpiece W suspended from the arm member 4, and is set in advance in the areas E1 to E2 shown in FIG. 2.

5 is a diagram showing the internal configuration of the workpiece transport device 1. A substantially cylindrical post 14 is erected on the support portion 5 of the base frame 2. The post 14 does not rotate by itself, but is for supporting various rotating members such as the arm member 4. A rotating shaft 15 is rotatably provided on the upper end of the post 14, and a plurality of rotating frames 17 (ten in this embodiment) are connected to the rotating shaft 15 via a substantially circular member 16 so as to spread out radially. Each rotating frame 17 is rod-shaped, and the circular member 16 holds the rotating frame 17 between itself and a member not shown.

The upper ends of a plurality of guide rails 18 extending in the vertical direction are respectively connected to the other end of each rotating frame 17. A ring member 8 is connected to the lower end of the guide rail 18. As shown in Figures 5 and 6, the guide rail 18 has a pair of side portions 19 extending in the vertical direction, and a plurality of horizontal surface portions 20 that connect both side portions 19 at a predetermined height position and extend in the horizontal direction. Each side portion 19 is formed with a recess 21 recessed inward, and the side portion 19 extends in the vertical direction while maintaining this recess 21. The horizontal surface portions 20 are formed in a substantially fan shape in a plan view.

The recesses 21 of adjacent guide rails 18 face each other, and a gap S that is formed in a substantially cross shape in a plan view is defined between these guide rails 18. In this gap S, a plurality of frame members 22 (ten in this embodiment) extending in the vertical direction as shown in Fig. 5 and Fig. 7 are raised and lowered at a predetermined stroke.

A stopper member 23 for restricting the downward movement of the arm member 4 is provided at the center portion outside the guide rail 18. In addition, below the stopper member 23, a lifting cover 24 is disposed.

The frame member 22 is provided with a plurality of rotatable rollers, which will be described later. That is, as shown in FIG. 7, the frame member 22 is provided with a pair of a first roller 25 and a second roller 26 provided near both upper and lower ends, a third roller 27 and a fourth roller 28 provided near both upper and lower ends and facing outward from the device, and a fifth roller 29 provided toward the inside of the device. These first to fifth rollers 25 to 29 roll on the inner surfaces of the side portions 19. In addition, a sixth roller 30 is provided near the upper end of the frame member 22 facing inward from the device, and this sixth roller 30 rolls on the inside of a first U-shaped rail 37 of a guide arm 36, which will be described later, or on the inside of a second U-shaped rail 41 of a guide frame 40, respectively.

A horizontally extending arm member 4 is connected to each frame member 22. A hanging member 31 for hanging a workpiece W is provided at the tip of each arm member 4 (see FIG. 5). The hanging member 31 may have a different mechanism depending on the shape of the workpiece W to be hung. Also, instead of the hung workpiece W, a storage member such as a basket for storing the workpiece W may be used.

The above-mentioned post 14 is formed with an upper flange 32 at its upper part and a lower flange 33 at its lower part. A plurality of shafts 34 are provided between the upper flange 32 and the lower flange 33 so as to connect them. A sliding member 35 is slidably provided on each shaft 34, and a guide arm 36 formed in a substantially L-shape is connected to each sliding member 35.

A first U-shaped rail 37, which is U-shaped in cross section, is provided at the tip of the guide arm 36 (see circle C in FIG. 5). The sixth roller 30 of the frame member 22 rolls inside the first U-shaped rail 37. One end of a piston rod 39 of an air cylinder 38, which extends in the vertical direction, is connected to the horizontal portion of the guide arm 36. The lower end of the air cylinder 38 is fixed to the base frame 2.

Although not shown, an air compressor and a pressure reducing valve for supplying air pressure to each air cylinder 38 are provided near the workpiece transport device 1, and the air pressure from the air compressor to each air cylinder 38 is controlled by solenoid valves V1 to V8 described later.

With the above configuration, when the air pressure for the air cylinder 38 is controlled, the piston rod 39 is moved up and down, which in turn moves the guide arm 36 and the frame member 22 up and down, thereby moving the arm member 4 up and down (see arrow D in FIG. 5). In this case, the frame member 22 supports the up and down movement of the arm member 4 by the first to fifth rollers 25-29 rolling in the gaps S between the guide rails 18. In addition, the sliding member 35 connected to the guide arm 36 slides on the shaft 34, thereby maintaining balance when the arm member 4 moves up and down.

The mechanisms for vertically moving the arm members 4 are provided in correspondence with the areas (see E2 to E9 in FIG. 2) where the arm members 4 are vertically moved. Therefore, in the areas (see E1 and E10 in FIG. 2) where the workpieces W are loaded onto or unloaded from the pre-processing device 1, it is not necessary to vertically move the arm members 4, and therefore the air cylinders 38 and piston rods 39 corresponding to these areas are not provided.

A plurality of guide frames 40 are provided on the upper surface of the upper flange 32 of the post 14. The guide frames 40 are rod-shaped and arranged on the upper flange 32 so as to spread out radially. A second U-shaped rail 41 that is U-shaped in cross section is formed on one end of the guide frame 40 (see circle E in FIG. 5 ), and the sixth roller 30 of the frame member 22 rolls on the inside of this second U-shaped rail 41.

The first U-shaped rail 37 of the guide arm 36 and the second U-shaped rail 41 of the guide frame 40 are arranged side by side on the same circumference while being alternately disposed in a plan view as shown in Fig. 8. Therefore, when the frame member 22 rotates together with the guide rail 18, the sixth roller 30 rolls inside the first U-shaped rail 37 and the second U-shaped rail 41.

9 is a diagram showing a friction drive unit 44 for rotationally driving the ring member 8 (main body 3). The ring member 8 and main body 3 are rotated by this friction drive unit 44. The friction drive unit 44 includes a motor 45, a rotation conversion unit 46 for converting the rotation direction of the motor 45, and wheels 47 to which the driving force of the motor 45 is transmitted via the rotation conversion unit 46.

The peripheral surface of the wheel 47 is in contact with the outer circumferential surface 10 of the ring member 8. The ring member 8 is rotationally driven by so-called friction drive. That is, when the wheel 47 rotates, a frictional force is generated between the wheel 47 and the ring member 8, and the driving force of the wheel 47 is transmitted to the ring member 8 by this frictional force, so that the ring member 8 is rotationally driven. An auxiliary roller 48 for maintaining the rotational driving force of the wheel 47 is rotatably provided on the back side of the contact surface of the wheel 47 with the ring member 8.

With the above configuration, the wheels 47 are rotated by the motor 45, which rotates the ring member 8, which in turn rotates the guide rail 18 (main body 3) connected to the ring member 8. Thus, the arm member 4 connected to the frame member 22 that moves up and down within the guide rail 18 is rotated, for example, in the direction of rotation shown in FIG. 2 (see arrow B ).

In addition, since the wheels 47 transmit the driving force to the ring member 8 by friction drive, the driving force transmission efficiency is inferior. However, the rotating guide rail 18 can be easily stopped, for example, by a worker manually stopping the guide rail 18.

As shown in FIG. 10, a mounting rail 50 extending in an arc shape in a plan view is provided on the upper part of the base frame 2, and three limit switches, first to third limit switches 51 to 53, are provided on the mounting rail 50, respectively.

The first limit switch 51 is for decelerating the rotating ring member 8. That is, when the first limit switch 51 abuts against any of the positioning docks 11 during rotation of the ring member 8, the rotation of the ring member 8 (main body portion 3) is decelerated.

The second limit switch 52 is for stopping the decelerated ring member 8. That is, when the second limit switch 52 abuts against the positioning dock 11 while the ring member 8 is decelerating, the rotation of the ring member 8 (main body 3) is stopped.

The third limit switch 53 is for emergency stopping the ring member 8 that should be stopped. That is, when the second limit switch 52 abuts against the positioning dock 11 but the ring member 8 is not stopped for some reason, the third limit switch 53 abuts against the positioning dock 11 to emergency stop the rotation of the ring member 8 (main body 3).

11, a clamp device 54 for positioning the arm member 4 is provided on the upper part of the ring member 8 near the installation position of the second limit switch 52. The clamp device 54 includes a pair of positioning claw members 55 for clamping the clamped portion 13 of the positioning dock 11, a pair of rotating members 56 for respectively rotating the pair of positioning claw members 55 at a rotation angle of approximately 90 degrees, and a clamp cylinder 57 for operating the pair of rotating members 56.

That is, when any of the positioning docks 11 abuts against the first limit switch 51, the rotation speed of the wheels 47 decreases, and when the same positioning dock 11 subsequently abuts against the second limit switch 52, the rotation of the wheels 47 stops. At the same time, the pair of rotating members 56 is operated by the clamping cylinder 57 of the clamp device 54, and the pair of positioning claw members 55 clamps the clamped portion 13 of the positioning dock 11, thereby determining the rotation stop position of the ring member 8 (main body portion 3), i.e., the stop position of the arm member 4.

The clamp cylinder 57 is provided with, for example, an air cushion, and has the function of mitigating the impact when the clamped portion 13 is clamped by the pair of positioning claw members 55 in the clamping operation.

12 is a block diagram showing the electrical configuration of the work transportation device 1. This work transportation device 1 is provided with a control unit 60. The control unit 60 is formed of, for example, a sequencer, and controls each component device of this work transportation device 1 in an integrated manner.

The control unit 60 connects a pre-processing start switch 61 and a pre-processing stop switch 62, and inputs a pre-processing start signal and a pre-processing stop signal that are manually operated by an operator from the pre-processing start switch 61 and the pre-processing stop switch 62. The control unit 60 connects the first to third limit switches 51 to 53, and inputs the ON signals output from these switches.

The control unit 60 is connected to the motor 45 and outputs a drive signal to the motor 45. The drive signal includes a signal for decelerating the rotation speed of the motor 45. The control unit 60 is connected to the first to eighth solenoid valves V1 to V8. The first to eighth solenoid valves V1 to V8 correspond to the first to eighth air cylinders C1 to C8, respectively, and the control unit 60 operates the first to eighth air cylinders C1 to C8 by outputting control signals to the first to eighth solenoid valves V1 to V8. The first to eighth solenoid valves V1 to V8 correspond to areas E2 to E9 shown in FIG. 2. The control unit 60 is connected to a clamping solenoid valve 63. The control unit 60 operates the clamping cylinder 57 by outputting a control signal to the clamping solenoid valve 63.

In addition, the control unit 60 has various operation timings, such as rotation, stopping, and up and down movement of the arm member 4, set and stored in advance, but these may be changeable as necessary.

Next, an example of the operation of the workpiece transport device 1 will be described.

In this workpiece transport device 1, when the operation is started, each arm member 4 rotates around the main body 3. At this time, each arm member 4 stops every time it reaches each of the areas E1 to E10 shown in Fig. 2, and after performing a predetermined lifting and lowering operation, it is transported to the next area E1 to E10. The transport angle between adjacent areas is about 36°.

The workpiece W is delivered by an operator in area E1, transported by the arm members 4 around the main body 3, and then unloaded in area E10. The height position of each arm member 4 relative to the main body 3 is based on the position shown in Fig. 1, and the arm members 4 are rotated only when they are at this height position.

First, an operator hangs the workpiece W from the arm member 4 in the area E1 and operates the pre-processing start switch 61, causing the control unit 60 to send a drive signal to the motor 45. This causes the motor 45 to rotate, which in turn causes the ring member 8 and the main body 3 to rotate, causing the arm member 4 to rotate around the main body 3. In this case, for example, the maximum rotational speed of the main body 3 is set to approximately 12 m/min.

Here, the arm member 4 moves from the initial position before rotation toward the position where the next area is located. At this time, the positioning dog 11 abuts against the first limit switch 51 just before the next area. When the control unit 60 receives an ON signal from the first limit switch 51, it reduces the rotation speed of the motor 45 and sends a control signal to the clamping solenoid valve 63 of the clamp device 54 to start the operation of the clamping cylinder 57. This starts the rotational operation of the pair of rotating members 56.

When the rotational operation continues after the rotation speed of the main body 3 is decelerated, the positioning dock 11 abuts against the second limit switch 52. When the control unit 60 receives an ON signal from the second limit switch 52, it stops the rotation of the motor 45. In this case, the pair of positioning claw members 55 of the clamp device 54 clamp the clamped portion 13 of the positioning dock 11. As a result, the arm member 4 is positioned and stopped at a predetermined position in each of the areas E1 to E10.

Next, the control unit 60 sends control signals to the first through eighth solenoid valves V1 through V8 to move the piston rods 39 of the first through eighth air cylinders C1 through C8 so as to retract into the air cylinder bodies. This causes the guide arm 36 to descend, and with it the arm member 4. The stroke of the piston rod 39 is predetermined (for example, about 650 mm), and when the arm member 4 reaches a predetermined height position, the control unit 60 stops sending control signals to the first through eighth solenoid valves V1 through V8. This causes each arm member 4 to stop at the predetermined height position.

Here, for example, if a cleaning tank (not shown) is provided at the position of area E4 and a coating tank (not shown) is provided at the position of area E7, when each arm member 4 is lowered, the workpiece W suspended therefrom is immersed in the cleaning tank at the position of area E4 and in the coating tank at the position of area E7.

Next, the control unit 60 sends a control signal only to the sixth solenoid valve V6 to move the arm member 4 located in the position of area E7 up and down. This controls the air pressure only for the sixth air cylinder C6, and the piston rod 39 advances and retreats relative to the air cylinder body. In this case, the control unit 60 frequently repeats sending a control signal to the sixth solenoid valve V6 multiple times. This causes the arm member 4 located in the position of area E7 to repeatedly and finely move up and down, and the workpiece W suspended from the arm member 4 is also repeatedly and finely moved up and down. Thus, the workpiece W is moved up and down while being immersed in the treatment liquid in the coating tank.

This ensures reliable coating of the workpiece W. Furthermore, when the workpiece W is repeatedly and finely moved up and down while immersed in the coating tank, air bubbles remaining on the surface of the workpiece W can be removed, and adhesion of the treatment liquid to the surface of the workpiece W can be promoted. Furthermore, when the workpiece W is repeatedly moved up and down, the treatment liquid circulates within the coating tank, further promoting adhesion of the treatment liquid, and ultimately shortening the coating time.

Thereafter, the control unit 60 sends a control signal only to the fourth solenoid valve V4 to move the arm member 4 located in the area E5 up and down. This controls the air pressure only for the fourth air cylinder C4, and the piston rod 39 advances and retreats relative to the air cylinder body. In this case, the control unit 60 repeatedly sends a control signal to the fourth solenoid valve V4. This causes the arm member 4 located in the area E5 to repeatedly move up and down, and the workpiece W suspended from the arm member 4 is also repeatedly moved up and down. This is an operation performed to remove water droplets and the like remaining on the surface of the workpiece W immersed in the cleaning tank in the area E4 by moving the workpiece W up and down multiple times.

When the repeated up and down movement of the arm member 4 in area E5 is completed, the control unit 60 sends control signals to the first through eighth solenoid valves V1 through V8 to raise all of the arm members 4 to the reference position. Thereafter, the control unit 60 drives the motor 45 so that the arm member 4 advances to the next area, and when the arm member 4 reaches the next area, the control unit 60 performs the same operation as described above.

In areas other than areas E5 and E7, the workpieces W are not immersed in a cleaning tank or a coating tank, and are naturally dried. The workpieces W may be dried by wind or the like in a predetermined area. The drying time of the workpieces W can be set to a more appropriate time by appropriately setting the number of arm members 4, the rotation speed of the main body 3, and the like.

When an operator wishes to end the pre-treatment process, he or she operates the pre-treatment stop switch 62. In response, the control unit 60 controls each component member to end the pre-treatment process.

As described above, the workpieces W that have arrived in area E1 are subjected to processes such as cleaning, drying, coating, etc. by going around the main body 3 once, and are then unloaded in area E10. Here, if a workpiece W is loaded and another workpiece W is unloaded every time the arm member 4 rotates to the next area, it is possible to continuously perform processes such as cleaning, drying, coating, etc. on a plurality of workpieces W.

In this way, according to the work transport device 1 of the present embodiment, the work W is transported by rotating around the main body 3, and pre-treatment processes such as washing, drying, coating, etc. are performed at each predetermined stopping position, so that the pre-painting pre-treatment process can be performed in a smaller space. In the conventional configuration, such processes are performed in a linear continuous line, which requires a large space, but with the work transport device 1, they can be performed in a small circular space.

Furthermore, according to the present workpiece transport device 1, since the loading and unloading of the workpieces W can be performed in the adjacent areas E1 and E10, for example, a single worker can load and unload the workpieces W. In the conventional configuration, the transport line is linear, so the loading and unloading of the workpieces W are performed at separate positions, and therefore a single worker cannot load and unload the workpieces W.

Furthermore, according to this embodiment, friction drive is used to rotate the ring member 8 (main body portion 3), so that an operator can manually stop the rotation of the main body portion 3 even in an emergency, making it possible to provide a work transport device 1 with excellent safety.

The scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the shape, size, quantity, and structure of each member in the above embodiment are not limited to the above embodiment, and can be appropriately modified in design.

In the above embodiment, the pretreatment processes such as cleaning, drying, and coating are performed in the above procedure, but the procedure of the pretreatment processes is not limited to the above procedure. Also, the workpiece transport device is not limited to be used in the above pretreatment processes, and may be used to transport materials in other fields, such as agricultural products.

REFERENCE SIGNS LIST 1 Work transport device 2 Base frame 3 Main body 4 Arm member 8 Ring member 11 Positioning dock 14 Post 18 Guide rail 22 Frame member 36 Guide arm 38 Air cylinder 40 Guide frame 44 Friction drive unit 45 Motor 47 Wheel 60 Control unit W Work

Claims (6)

A base frame;
A main body portion rotatably supported by the base frame;
A plurality of arm members that are provided so as to extend radially from the main body in a plan view and each support a plurality of workpieces;
A rotation drive means for rotating the main body portion;
a plurality of vertical movement means for independently moving the plurality of arm members vertically;
A control means for controlling the rotation drive means and the vertical movement means;
Equipped with
The control means
By rotating the main body by the rotation drive means, any one of the arm members is transported to a position in a coating tank for coating each of the plurality of workpieces;
The conveyed arm member is lowered by the vertical movement means to immerse the work supported by the arm member in the coating tank;
After the workpiece is immersed, the arm member is repeatedly and finely moved up and down to repeatedly and finely move the immersed workpiece up and down,
transporting another arm member, different from the arm member, supporting another workpiece different from the workpiece immersed in the coating tank to a next arrangement position of the cleaning tank for cleaning each of the plurality of workpieces;
The workpiece transport device according to claim 1, wherein the other arm member is repeatedly and finely moved up and down by the vertical movement means, thereby repeatedly and finely moving the other workpiece up and down. The main body portion is
A ring-shaped rotatable ring member is provided at the bottom of the ring,
The rotation drive means is
A motor and a wheel that rotates when driven by the motor,
The ring member and the wheel are in contact with each other at their circumferential surfaces,
The ring member is
2. The workpiece transport device according to claim 1, which is rotationally driven by friction drive in which the driving force of the motor is transmitted by frictional force with the rotating wheels. The control means
The workpiece transport device according to claim 2 , wherein the ring member is rotated and stopped by controlling the rotation of the motor . The main body portion is
A plurality of guide rails extending in the vertical direction are provided,
The vertical movement means is
an air cylinder; and a frame member extending in a vertical direction that is moved up and down by the air cylinder while being guided by the guide rail,
The arm member is
4. The workpiece transport device according to claim 1, wherein the workpiece transport device is connected to the frame member so as to be movable up and down. The control means
5. The workpiece transport device according to claim 4, wherein the air pressure supplied to the air cylinder is controlled to move the frame member up and down and also move the arm member up and down. 6. The workpiece transport device according to claim 1, further comprising a positioning means for stopping said main body at a predetermined stop position.

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