JPH041142Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a dust-proof pallet conveyor suitable for a painting line for large articles such as automobile bodies that require high-quality coatings.

Prior Art In conventional pallet conveyors, sufficient consideration has not been given to the adhesion of paint used in the painting process. In other words, a method was adopted in which a large conveyor chain was used and the conveyor chain was forced to operate even if paint adhered to the chain or pallets. Therefore, although drive motors with an order of magnitude higher output were used, the amount of paint deposited gradually increased, making it necessary to periodically remove and clean the chain. In addition, pallets had to be periodically cleaned at designated locations to remove paint, which was extremely costly.

An even bigger problem is that when the paint on the pallet dries as it passes through the oven, the dried paint on the parts that make contact with the drive chain gradually peels off and scatters around the factory, causing poor quality paint. It was.

Problems that the invention aims to solve The purpose of this invention is to create a dust-proof pallet that prevents paint from adhering to the lower part of the pallet, such as the drive chain and pallet support rollers, in the booth where transferred objects placed on the pallet are painted. The purpose of this project is to propose a tube conveyor.

Means for Solving the Problems In this proposal, an upper frame for loading objects is mounted on a lower frame whose lower surface engages with a drive chain provided along a transfer path and guides the movement along the transfer path. A pallet fixed with a joining fitting having a vertical part aligned with the direction of transport and having a small width perpendicular to the transport direction, and a lower frame having a vertical passage groove in the upper part, the upper surface of the lower frame, the side surface and lower part of the pallet below the upper surface. It is characterized by having a fixed dustproof cover that surrounds the guide running path of the frame and the drive chain and is long in the transport direction.

Function The pallet is guided along the transfer path by a drive chain, and inside the coating booth, a fixed dustproof cover surrounds the upper surface of the lower frame and both side surfaces C of the pallet below the upper surface, excluding the upper passage groove, and covers the width of the passage groove. Since it is small, there is almost no chance of paint entering the dustproof cover, and the lower frame etc. can be kept clean.

Embodiment In FIGS. 1 to 3, a free roller conveyor 1 that serves as a guide path for pallets has a frame 4 in which support columns 2 suspended above the floor on both sides of the transfer path are connected to each other by a horizontal member 3. A flanged roller 6 is rotatably supported at a predetermined interval by a support member 5 fixed to the upper end of the support column 2 and having an upward U-shaped cross section extending in the transport direction. At the center of the frame 4, a chain support frame 7 is fixed on the horizontal member 3, and two pairs of right and left U-shaped cross-section rails 8 with openings facing each other are fixed in two stages, upper and lower, and the upper rail 8
The rollers of the endless drive chain 10 are guided and supported by the guide bars 9 attached to the upper and lower inside of the lower rail 8, and the return rollers of the drive chain 10 are supported by the guide bars 11 attached to the lower inner side of the lower rail 8. .

The pallet 12 is made by welding a pair of vertical members 13, which are longer in the transport direction than the object M, and horizontal members 14 at the front and rear ends of the vertical members 13 in a square shape. A lower frame 15 that is supported on rollers 6 and moves, and a front and rear horizontal member 16 that is welded to the vertical member 13 at its front and rear intermediate portions.
It has an upper frame 19 on which a coupling fitting 17 having a U-shaped cross section is fixed to the upper part of the frame so as to be biased to one side from the left and right centers, and a horizontal member 18 whose left and right centers coincide with the lower frame 15 is fixed thereto, An automobile body M is loaded onto supporting metal fittings 20 fixed to both ends of the horizontal member 18.

For example, the coupling fitting 17 has a vertical portion 17a,
It may be of any other cross-sectional shape, such as an I-shaped member, and the vertical portion 17a has a small width or thickness perpendicular to the transfer direction, and the front and rear vertical portions 17a are aligned and fixed in the transfer direction.

In order to drive the pallet 12 by the drive chain 10, a detachable engagement device 21 is provided between the lower frame 15 and the drive chain 10. The engaging device 21 may have any known structure, but in this embodiment, the structure is such that the pallet 12 can be stored on the conveyor 1. That is, a hook metal fitting 24 is pivotally supported by pins 23 to attachment links 22 provided at predetermined intervals on the drive chain 10, so that the hook metal fitting 24 can freely swing up and down. The pallet 12 is pushed by holding the hook 26 in the upright position shown in the figure and engaging the pusher plate 27 protruding below the front end of the lower frame 15. A push-down piece 29 that can come into contact with the front slope 28 is fixed. In the upright position, the horizontal members and the pusher plate 2 are arranged so that the hooks 26 do not hit the horizontal members 14, 16.
Define the height of 7.

At this time, when a stopper (not shown) protrudes into the pallet travel path and hits the slope 28, the hook fitting 2
4 is lying down and the hook 26 is the pusher plate 27
The pallet 12 comes off from the stopper and stops. When a succeeding pallet approaches this stop pallet 12, the slope 28 of the hook metal fitting of the succeeding pallet 12 hits the push-down piece 29 of the preceding stop pallet, causing the hook metal fitting to fall down, and comes into contact with the preceding stop pallet and stops. Thereafter, the pallets 12 are sequentially stopped and stored on the road in the same manner.

When the stopper is retracted, the preceding stop pallet 1
2 automatically engages the pusher plate 27 with the hook 26 coming from behind and starts moving, and thus the pallets 12 in storage start one by one. The lower frame 15 is made longer than the objects M so that the objects M do not collide with each other during storage.

Inside the painting booth, vertical columns 3 are fixed to the floor at a predetermined interval on both sides of the columns 2.
Horizontal members 31 and 32 are fixed to the upper ends of the horizontal members 31 and 32, and a narrow passage groove 33 through which the vertical portion 17a passes is formed between their tips, and dustproof covers 34 and 35 are installed on the outside of the horizontal members 31 and 32 and the support column 30. The roller 6 and its support member 5, the drive chain 10 and its guide rail 8, the movable parts such as the engagement device 21, sliding parts, etc. are surrounded in a tunnel shape except for the passage groove. Since the width of the passage groove 33 is small, the covers 34 and 35
Although it is possible to almost prevent paint from entering the interior,
Furthermore, elastic bodies 36 such as flexible plastic sheets are attached to the covers 34 and 35 along the passage groove 33 so that their tips touch each other, so that only the portion through which the vertical portion 17a passes is locally curled upward. By doing so, the dustproof effect can be further improved.

In another embodiment shown in FIGS. 4 and 5, grooves 38 are formed in the rail members 37 fixed to the lower surfaces of the vertical members 13 of the lower frame 15a, and a U-shaped support frame 39 fixed on the floor is provided with grooves 38. Concave groove 38 on the top surface
Rails 41 having concave grooves 40 of the same shape are fixed in two stages, upper and lower. The endless drive chain 10a provided on both sides of the transfer path has a top roller 6a having the same shape as the running roller 42. The roller 42 fits into the groove 40 and runs, and the top roller 6a fits into the groove 38. The lower frame 15a is guided and moved. The structures of other parts such as the upper frame 19, the coupling fittings 17, and the dustproof covers 34 and 35 are the same as those in the previous embodiment.

In this embodiment, since pallets can be stored, the lower frame 15a is made longer than the object M in the front and back.

In another embodiment shown in FIGS. 6 and 7, a rail 41 is fixed to the upper part of the support frame 39, and a rail 43 that is inserted between the link plates of the drive chain 10b is fixed to the lower part of the support frame 39, and an endless drive chain 1
0b, the roller 44 is attached to the link plate 4 on the outward journey.
5 and fits into the groove 40 of the rail 41, and the rail 43 supports the roller 44 on the return trip. The lower frame 15b is the drive chain 1
It is supported and transported on the flat upper edge of the link plate 45 of 0b. Upper frame 19, coupling fittings 1
7. The structure of other parts such as the dustproof covers 34 and 35 is the same as in the previous embodiment.

Effects of the invention The present invention is as described above, and the structure is simple because the truck does not have running rollers.The upper frame and the lower frame are connected by a connecting metal fitting having a vertical part 17a with a small width, so it is easy to paint. Inside the booth, the lower frame and all of its travel drive parts are closed with dustproof covers except for the vertical passage grooves, completely preventing paint from adhering to the rollers and other moving parts, greatly improving the quality of the coating. This method has the advantage of being effective and having an extremely simple structure.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention,
Figure 1 A and B are lines A-A and B-B in Figure 2, respectively.
2 is a side sectional view, FIG. 3 is a plan view of the trolley, and FIGS. 4 and 5 are partial side sectional views of other embodiments, and C-C arrows in FIG. 4. The elevational views, FIGS. 6 and 7, respectively show the fourth embodiment of the
FIG. 5 is a diagram similar to FIG. 1, 6a...Guide route, 9, 9a, 9b...
Drive chain, 12... Palette, 15, 15
a, 15b...Lower frame, 17...Joining metal fittings, 17a...Vertical part, 19...Upper frame,
33... Passage groove, 34, 35... Fixed dust cover.

Claims (1)

[Scope of utility model registration request] A pallet conveyor for transporting large items,
An upper frame for loading objects is aligned in the transfer direction and has a width perpendicular to the transfer direction on the lower frame whose lower surface engages with a drive chain provided along the transfer path and guides and runs along the transfer path. A pallet is fixed with a coupling fitting having a small vertical part, and has a passage groove with a vertical part in the upper part, and surrounds the upper surface of the lower frame, the side surface of the pallet below the upper surface, the guide running path of the lower frame, and the drive chain. A dustproof pallet conveyor with a fixed dustproof cover that is long in the transport direction.