JPH062768Y2 - Jig for car body rotation in painting line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a jig for rotating an automobile body in a painting line.

(Prior art and its problems) When coating an automobile body as an object to be coated, a preparatory step of removing dust adhering to the body, a step of applying a paint to the body, and a drying of the applied paint And a drying step.

Then, the body normally undergoes the above-mentioned preparation process, coating process, and drying process while being transported by a transport carriage, but the posture of the body is maintained while maintaining a predetermined posture in each process.

By the way, recently, in a coating line of an automobile body, there has been a demand for a body which can be rotationally driven for various reasons. The reason for rotating this body during transportation is as follows, for example.

The first reason is to reduce the number of coating guns as much as possible. That is, for example, when the paint is sprayed on the upper surface, the left side surface, and the right side surface of the body, conventionally, the fixed type or reciprocating type coating is applied so that the paint can be sprayed on the three surfaces. The guns were arranged at the respective positions corresponding to the above three surfaces. However, if the body can be rotated, the surface facing the coating gun can be changed by rotating the body, and thus the coating gun can be set only for a certain one-direction position. It will be good (decrease in the number of painting guns).

The second reason is that the body is uniformly heated in the baking furnace. That is, in the baking oven, the hot air is circulated so that each part of the body is heated as uniformly as possible. However, if the body is rotated in the baking oven, it is more preferable in terms of uniform heating. Will be things.

The third reason is a request from a new coating method. That is, in the coating process, the coating is applied to a thickness not less than the sagging limit, and by rotating the object to be coated around the horizontal axis in the next drying process, the smoothness can be further improved if the coating film has the same thickness. This will result in a high quality painted surface which will require rotation of the body when performing such drying methods.

As described above, when the automobile body is rotationally driven, it is necessary to rotatably support the automobile body. For this reason, a rotation jig is attached to the automobile body, and the rotation shaft portion formed on the rotation jig, that is, the supported portion that serves as the rotation center of the automobile body is supported by, for example, a support formed on the carriage. It is considered to be supported by the department.

When rotating an automobile body using this rotating jig, the problem is how the rotating jig can reliably support an automobile body that is a heavy object. Explaining this point in detail, as a rotating jig, it is desirable to attach it to the front part and the rear part of the automobile body in consideration of the weight balance of the automobile body, while the rotating shaft part as the supported part is It is desired to be located on the outer side of the body, that is, on the front side and the rear side of the body. In this case, the rotary shaft portion and the attachment portion to the body integrated with the rotary shaft portion are inevitably offset from each other in the axial direction of the rotary shaft portion. In this way, when the rotary shaft portion and the mounting portion are offset from each other, the mounting portion is displaced in the axial direction by the weight of the automobile body no matter how firmly the bearing is supported. Trying to leave) will be unavoidable.

The axial displacement of the mounting portion causes the following undesirable phenomenon. Firstly, when attention is paid to the rotating jig, it means that the rotating jig can be bent between the rotating jig and the mounting portion, which is not preferable in terms of durability of the rotating jig. Second,
When focusing on the automobile body itself, the automobile body is bent, that is, strained. In particular, an automobile body has a strength member such as a side frame that extends long in the front-rear direction of the body, but there are some automobile bodies that do not have the side frame over the entire length of the body such as an FF vehicle. In addition, it is generally known that an automobile body is designed to finally obtain a desired strength by assembling an engine and a suspension, but at the painting stage, an engine or the like as such a strength member is mounted. There is a limit to the dependence on the strength of the car body itself, since it is generally not. Thirdly, the center of rotation of the automobile body is deviated during the rotation of the automobile body. That is, no matter how firmly the pair of front and rear rotary shaft portions are supported, this intermediate portion is eccentric with respect to the axis of the rotary shaft portion, which is disadvantageous in that smooth rotation can be obtained.

By the way, as a technique for rotatably holding a work on a painting trolley, it is disclosed in Japanese Utility Model Laid-Open No. 60-213.
There is No. 61 publication. In this structure, four elongated members form a quadrangular frame as a whole. Standing portions are extended above the front and rear elongated members, and rotary shaft portions are integrated with the upper standing portions. The upper standing portion and the front and rear elongated members are connected and reinforced by a diagonally inclined reinforcing member. And the work is the above-mentioned 4
It is adapted to be attached to four elongated members forming a rectangular shape.

However, in an automobile body having a complicated shape, it is practically difficult to place and fix the automobile body on the four elongated members as described in the above publication, that is, In order to support the rotation of an automobile body, front and rear mounting portions that are projected so as to be largely offset in the axial direction with respect to the rotation shaft are required. As a result of this large offset projection, it is difficult to reliably support the automobile body as described above.

Therefore, an object of the present invention is to use a rotating jig such that a pair of front and rear mounting portions, which are mounted on the front and rear portions of an automobile body, are provided offset relative to the rotating shaft portion in the axial direction. It is an object of the present invention to provide a jig for rotating an automobile body in a painting line, which is capable of maintaining a predetermined distance between the pair of mounting portions without imposing an unreasonable burden on the automobile body.

(Means and Actions for Solving Problems) In order to achieve the above-mentioned object, the rotating jig in the present invention has the following configuration. That is, it is a rotating jig used to rotate an automobile body as an object to be coated in a coating line, and the jigs are located on the same straight line with a predetermined interval in the axial direction.
A pair of front and rear rotary shafts, each of which is a supported portion, is attached to the front end of the automobile body and is integrated with the front rotary shaft via a front continuous portion, and the front continuous shaft is connected to the front rotary shaft. A front side mounting portion that is erected rearward from the installation portion, and is attached to the rear end portion of the automobile body and is integrated with the rear side rotation shaft portion via a rear side continuous portion. Along with the rear side connecting portion, the rear side attaching portion erected forward from the rear side connecting portion and the front side connecting portion and the rear side connecting portion are connected to each other in the vicinity of the attaching portion to connect the pair of attaching portions. The reinforcing connection part is provided for restricting the change of the space, and the structure is provided.

As described above, in the rotating jig according to the present invention, the front mounting portion that is integral with the front rotating shaft portion and the rear mounting portion that is integral with the rear rotating shaft portion are connected by the reinforcing connecting portion. Therefore, the distance between the pair of mounting portions is always maintained at a predetermined value. Of course, one of the pair of mounting parts is on the front part of the body,
Since the other is attached to the rear part of the body, the weight of the automobile body can be distributed to the front and rear rotating shaft parts in a well-balanced manner.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

Here, in the example, in order to improve the smoothness of the coated surface obtained with the same coating film thickness, in the spraying of the coating material in the coating process, the coating film thickness should be equal to or more than the sagging limit. In the drying process, the body is rotated around the horizontal axis. The present invention is applied to the rotation of the body around the horizontal axis.

Explaining the above points, first, there is smoothness (flatness) as one criterion for evaluating the quality of a coated surface. The higher the smoothness, the smaller the degree of unevenness of the coated surface, and the better the coated surface. Becomes It is already known that in order to improve the smoothness of the coated surface, the thickness of the coating film, that is, the thickness of the applied coating material may be increased.

On the other hand, there is "drip" of the paint that hinders the quality of the painted surface. This sagging is caused by the downward flow of the paint applied by receiving gravity, and the larger the film thickness of the paint applied at one time, the more easily “sagging” occurs. After all, because of the influence of gravity, it tends to occur on the surface of the body extending in the vertical direction, that is, the so-called vertical surface.

Therefore, the horizontally extending surface of the body, that is, the so-called lateral surface, in which the "drip" of the paint is not a serious problem, can make the thickness of the applied coating larger than that of the vertical surface. Further, even if the thickness of the coating film on the horizontal surface and the thickness of the coating film on the vertical surface are the same, the unevenness becomes small due to a slight flow of the paint that does not cause sagging on the horizontal surface,
A smoothness better than the smoothness on the vertical surface can be obtained.

From the above-mentioned viewpoint, conventionally, in order to prevent "drip" of the paint and to obtain a coated surface with a large smoothness as much as possible, the paint with the least fluidity has been used for the coating. The so-called "drip limit" in which "drip" of the paint occurs on the vertical surface is, for example, in the case of thermosetting paint, the maximum thickness of the coating film is about 40 µm. More specifically, "drip" of the thermosetting coating is likely to occur in the initial setting process and the initial baking process, especially in the initial baking process, and is applied in the coating process so that "drip" does not occur at this time. The thickness of the paint is determined, and the maximum value of the determined thickness, that is, the sag limit value is about 40 μm. Therefore, if you try to obtain a coated surface with even greater smoothness,
In the conventional coating method, it is necessary to repeat a series of steps from the coating step to the baking step a plurality of times, such as coating twice.

However, since the direction of gravity acting on the paint applied to the body is changed by rotating the body in the horizontal direction by applying the amount above the sagging limit and subsequently rotating the body horizontally. , The paint will be dried without dripping.

Thereby, the film thickness of the coating material applied per time can be made much thicker than in the past, and a very good coated surface can be obtained in which the smoothness far exceeds the level which has hitherto been the limit.

Further, even when the coating film has the same thickness as the conventional one, it is possible to obtain an excellent coated surface having smaller irregularities, that is, greater smoothness, by utilizing the fluidity of the coating material.

Furthermore, if an attempt is made to obtain a coated surface having the same smoothness, for example, a smoothness equivalent to that obtained by a conventional coating method,
The film thickness of the paint to be applied can be made thinner than that of the conventional one, and the amount of the paint to be used can be reduced by this amount.

Needless to say, a paint that causes "drip" even in a thin paint film can be obtained by reducing a component that impairs fluidity from a conventional paint by a predetermined ratio.

Overview of Overall FIG. 1 shows the overall steps of coating an automobile body W as an article to be coated, and the steps are shown by P1 to P4.

First, the body W, whose undercoating has been completed by known electrodeposition coating, is sent to the preparation step P1 while being held by the carriage D. In this preparation step P1, dust inside and outside the body W is removed by, for example, air blow or vacuum suction. Next, in step P2, the coating material (thermosetting coating material in the embodiment) is sprayed onto the body W, and then the coating material is dried in the setting step P3 and the baking step P4.

Removal of Dust The removal of dust in step P1 may be performed while rotating the body W around the horizontal axis, as shown in FIG. That is, for example, first, in the state shown in FIG. 2A, the rotation of the body W is stopped to remove dust, and then the posture of the body W is changed to the state shown in FIG. 2B. It is stopped at the position and dust is removed again. In this way
As shown in (c), (d), ... (I) of FIG. 2, dust is removed while rotating the body W intermittently.

In this way, by removing dust while rotating the body W, for example, dust that adheres to the inner surface corners of the body W or the closed cross section of the side sill, that is, the body W must be rotated. It is possible to completely remove dust that does not fall.

The rotation range of the body W is 36 as shown in FIG.
The rotation may be 0 °, but in accordance with the rotation of the body W in the drying process described later, for example, it is rotated in a range of 180 ° (range between FIGS. 2 (a) and 2 (e)) and the like. Can be one.

Spraying and Drying of Paint First, the spraying of paint at P2 is performed so that the thickness of the coating film is not less than the sag limit. That is, in the conventional thermosetting coating material generally used, the maximum thickness of the coating material that does not cause "sagging", that is, the sag limit value is about 40 μm, but in the process P2, the sagging limit is far from 40 μm. To make a thick coating (eg 65 μm)
The paint is sprayed so that

After this P2, the setting process of P3 is immediately started. In this setting process P3, FIG. 2 (a)
As shown by (i) to (i), the body W is rotated in the horizontal direction. That is, the body W is rotated about a rotation axis extending in the horizontal direction, and in the embodiment, this rotation axis extends in the front-rear direction of the body W. Although the temperature atmosphere in the setting step P3 is room temperature in the embodiment, it can be set to an appropriate temperature in the range of 40 ° to 60 ° C lower than the temperature atmosphere in the next baking step P4. . Of course, this setting process P3
This is to volatilize the low boiling point component in the paint in advance, which prevents the occurrence of pinholes on the coated surface due to the rapid volatilization of the low boiling point component in the subsequent baking step P4.

In the baking process P4, the paint is baked in a temperature atmosphere of 140 ° C., for example. Even in this P4, P
2 (a) to (i) as in the setting step of No. 3
The body W is horizontally rotated as shown in FIG.

Due to the horizontal rotation of the body W at P3 and P4 described above, even if the paint is sprayed to a thickness exceeding the sag limit at P2, the paint is dried without sagging. As a result, a high-quality coated surface with extremely high smoothness, which cannot be obtained by the conventional coating method, can be obtained.

Relationship between coating thickness, sag limit, smoothness and horizontal rotation FIG. 3 shows the effect of the coating thickness on the sag limit, focusing on the thermosetting paint. FIG. 3 shows three cases of coating film thickness of 40 μm, 53 μm, and 65 μm. It is understood that in any of these thicknesses, "dag" peaks occur both at the beginning of the setting process and at the beginning of the baking process. Further, the sag limit is a value when sagging of 1 to 2 mm is usually generated in 1 minute (a sagging of 2 mm / min or more is visually confirmed to be a bad coated surface). The maximum coating thickness obtained in the range is 40μ with conventional paint.
It is about m.

On the other hand, FIG. 4 shows the influence on the smoothness when the body W is rotated in the horizontal direction and when it is not. A in FIG. 4 shows a state in which the body W is not rotated (conventional coating method). FIG. 4B shows a body W
Is rotated 90 degrees and then reversed (forward / reverse rotation between FIGS. 2 (a) and 2 (c)). FIG. 4C shows
The case where the body W is rotated by 135 ° and then reversed is shown (forward / reverse rotation between FIGS. 2 (a) and 2 (d)). FIG. 4D shows a case where the body W is rotated 180 ° and then reversed (forward / reverse rotation between FIGS. 2A and 2E). FIG. 4E shows a case where the body W is continuously rotated in the same direction (FIGS. 2 (a) and 2 (b)).
(C) ... Take the order of (i) and return to (a) again).

As is apparent from FIG. 4, if the coating film has the same thickness, it is better to rotate the body W (see FIGS. 4B, C, D, and
E), the smoothness is larger than that when not rotated (FIG. 4A). Further, it is understood that it is preferable to rotate 360 ° in the same direction even in the same rotation in order to improve the smoothness. Of course, when the body W is not rotated, there is a limit to the thickness of the coating film, so there is a limit to increasing the smoothness.

By the way, the thickness of the coating film is 65 μm and the body W is 36
When rotated by 0 °, the smoothness obtained is the image clarity I.S. The value of G is “87” (lower limit of PGD value of 1.0). Further, when the thickness of the coating film is 40 μm, the I.V. G is "58" (lower limit of PGD value is 0.7), whereas when the body W is rotated 360 °, the I.D. "68" for G (0.8 for PGD value)
Is the lower limit of).

As is known, the IG (image gloss) in the image clarity indicates the ratio of the image clarity to the mirror surface (black glass) as 100, and the PGD indicates the identification degree of the reflected image as 1. It is a value in which the smoothness of the coated surface decreases as the value decreases from 0.0.

The test conditions for the data shown in FIGS. 3 and 4 are as follows, and the test conditions show the conditions for performing overcoating with P2.

a. Paint: Melamine alkyd (black) Viscosity: Ford cup # 4 22 seconds / 22 ° C b. Coating machine: Minibell (16,000 rpm) shaping air. ． 2.0 kg / cm ₂ c. Discharge rate: Spraying in two times, the first time. ． ．
100 cc / min second time. ． 150-200cc /
min d. Setting time: 10 minutes x normal temperature e. Baking conditions: 140 ° C x 25 minutes f. Ground smoothness: 0.6 (PGD value) (intermediate coating, on PE tape) g. Rotation or reversal operating range: Setting (10 minutes) ~
Baking (10 minutes) h. Object to be coated: Painted on the side of a 30 cm square cylinder, rotatably supported at the center i. Rotational speed of coated object: 6 rpm, 30 rpm, 60 r
Although the difference was caused by the difference in rotation speed, there was virtually no difference due to the difference in rotation speed. However, when the paint was a two-component curing type using a main resin and a curing agent, sagging occurred only in the setting step P3. If the coating material is a powder coating material, sagging occurs only in the baking step P4. Therefore, the rotation of the body W may be performed only in the setting step P3 or in the baking step P4. Further, in the case of powder coating, no setting process is necessary since it does not contain a solvent.

Truck A truck having a function of rotating the body W.

In FIG. 5, the base 21 of the truck D is driven on the road surface (rail 23) by using the wheels 22. This base 2
From 1, a pair of front and rear stays 24 are provided so as to extend downward, and a pulling wire 25 is fixed to each of the stays 24. The wire 25 is driven by a motor (not shown) provided in a safe place for explosion protection, and thereby the carriage D is driven to travel via the wire 25.

On the other hand, on the base 21, a pair of boxes 26 and 27 are fixed at the front and rear ends (left and right ends in FIG. 5). The pair of boxes 26 and 27 are provided in the rotating jig 1 described later.
The bearings 28 and 29 are fixedly arranged on the upper surfaces of the boxes 26 and 27, respectively. The space between the pair of boxes 26 and 27 is a support space (rotation space) 30 that is slightly larger than the front-rear length for the body W. The rotary drive portion will be described later.

Rotating Jig As shown in FIGS. 5 and 6, the rotating jig 1 is roughly divided into a front portion 1F, a rear portion 1R, and a reinforcing connecting portion 2 connecting both portions. As shown in FIG. 8, the front portion 1F has a continuous portion 3 and a pair of left and right mounting portions 4 formed by bending a single iron plate or the like, and the continuous portion 1F. It has a cylindrical rotary shaft portion 5 joined to the installation portion 3 by welding or the like. The rotating shaft portion 5 is provided with a bearing 28.
Is rotatably supported by the box 26 via the rotary shaft 5, and the rotation of the rotary shaft portion 5 is transmitted to the mounting portion 4 via the continuous portion 3. In the embodiment, the attachment portion 4 is detachably attached to the front end portions of the pair of left and right front side frames 11 of the body W using, for example, bolts.

Since the rear side portion 1R of the rotating jig 1 is also configured substantially the same as the front side portion 1F, the corresponding components are designated by the same reference numerals and the description thereof will be omitted. However, the mounting portion 4 of the rear portion 1R has a shape that fits in a rear end opening of the rear side frame 12 of the body W in a plug-in type without rattling. Of course, the rear part 1
The R rotary shaft portion 5 is rotatably supported by the box 27 via a bearing 29. And both front and rear rotary shafts 5
The bodies W are arranged so as to extend on the same straight line in the front-rear direction and in the horizontal direction with the body W interposed therebetween, and the bearing of the rotary shaft portion 5 serves as the center of rotation.

The reinforcing connecting portion 2 of the rotating jig 1 is joined to each continuous portion 3 of the front portion 1F and the rear portion 1R by welding or the like. In the embodiment, the reinforcing connecting portion 2 is formed by using two left and right hollow square iron materials. The joining position with respect to the reinforcing connecting portion 2 is set as close to the mounting portion 4 as possible. The side frames 11 and 12 are at least partially seated on the reinforcing connecting portion 2 so that the weight of the body W is supported by the portion other than the mounting portion 4 in a shared manner. Further, the reinforcing connecting portion 2 is fixed to the front side frame 11 and the rear side frame 12 by a bracket or the like at a position apart from the mounting portion 4 by the bracket 6, so that the body W rotates more reliably without rattling. It is connected to the jig 1.

Rotational drive A drive unit K (not shown) is arranged in each of the boxes 26 and 27. This drive unit K
Includes at least a drive source such as an air motor,
An output shaft 31 to which power from the drive source is transmitted extends to the outside of the box 26 or 27. And
Each output shaft 31 is transmitted to the front and rear rotary shafts 5 via a transmission mechanism 32 including a sprocket and a tune.

In order to rotate the body W, a dedicated actuator may be used separately, or the traveling of the carriage D may be used. In this case, for example, the wheels 22 and the rotating shaft portion 5 of the rotating jig 1 may be connected. It should be linked.

Balance Weight It is preferable that the center of rotation of the body W passes through the center of gravity G (see FIG. 5) that is a composite of the body W and the rotating jig 1. In other words, by making G and G coincide with each other, it is possible to prevent rotation fluctuation. If it is difficult to match this with G, the body W including the rotating jig 1
It is advisable to provide a balance weight on the rotary shaft system.

An example of such a balance weight B is shown in FIG. Reference numeral 41 in FIG. 8 denotes a first screw rod, which is installed between a pair of left and right mounting portions 4 in the front portion 1F of the rotating jig 1. The first weight 4 is attached to the first screw rod 41.
2 is screwed, and one end of the second screw rod 43 is fixed to the first weight 42. This second screw rod 43
Extends in a direction orthogonal to the first screw rod 41, and
The second weight 44 is screwed onto the screw rod 43. Incidentally, reference numerals 45 and 46 in FIG. 8 are lock nuts.

Therefore, by changing the screwing position of the first weight 42 with respect to the first screw rod 41, the final center of gravity G ′ of the rotating shaft system including the body W, the rotating jig 1 and the balance weight B in the axial direction of the axle. The position is adjusted. Further, by adjusting the screwing position of the second weight 4 with respect to the second screw rod 43, the vertical position of the center of gravity G ′ is adjusted. Further, by adjusting the circumferential position of the first weight 42 with respect to the first screw rod 41, the center of gravity G ′ can be adjusted downward and upward by the second weight 44 as well as the front-back direction. (Second weight 4
This second weight 4 so that the center of gravity G passes near the height of 2
2 height position is adjusted beforehand). In this way, the position of the center of gravity G ′ of the rotary shaft system is adjusted so that the center of gravity G ′ coincides with the center of rotation.

Of course, such adjustment of the center of gravity G'is performed at an appropriate time before rotating the body W, and in the embodiment, before the preparatory step P1, more specifically, when the body W is mounted on the carriage D. I am going to do it.

Operation of Embodiment Configuration In the above-described configuration, when the body W is rotated around the rotation center, the mounting portions 4 at the front and rear of the rotation jig 1 receive the weight of the body W and move in the rotation center direction. Try to get away from each other. However, such movement is restricted by the reinforcing connecting portion 2. By this, the other parts 3 and 4 of the front and rear parts 1F and 1R of the rotating jig 1 are prevented from being bent with respect to the rotary shaft part 5, and the durability of the front and rear parts 1F and 1R is improved. Can be secured.
Further, since the body W is not bent so that the lower portion of FIG. 5 expands with respect to the upper portion, the deformation of the body W can be prevented. In addition to this, the intermediate portion between the front and rear portions 1F and 1R does not greatly separate from the center of rotation (wobble prevention), and smooth rotation is performed.

Supplementary explanation In the above embodiment, the rotation jig 1 is arranged on the carriage D,
The body W is attached to the rotating jig 1 attached to the carriage D.
The case where the rotating jig 1 is attached and detached has been described, but the rotating jig 1 may be attached to the body W in advance, and then the set body of the body W and the rotating jig 1 may be attached to the carriage D. Good. For this purpose, for example, the rotating shaft portion 5 of the rotating jig 1 can be engaged with and disengaged from (the supporting portion of) the carriage D from above in FIG.

An example of this is shown in FIGS. 9 to 14, but in these figures, the rotary drive is transmitted only from the front rotary shaft 5, and the rear rotary shaft 5 is always the body. It is a type of rotating with the rotation of W. And
Since the rotational force from the transmission mechanism 32 to the front rotary shaft portion 5 is interrupted, the connection shaft 40 on the box 26 is constantly rotated with respect to the transmission mechanism 32 (for example, spline engagement).
Is slidably held.

On the premise of the above, one of the notches 26a is formed on the upper end surface of the box 26 (FIG. 9 to FIG.
(See FIG. 11), a notch 27a is formed on the upper end surface of the box 27 (FIGS. 9 and 13).
See FIG. 14). These notches 26a and 27a are
The size is such that the rotary shaft portion 5 can be fitted therein. And
A flange portion 5a is formed on the rear rotary shaft portion 5, while a notch 27b having a shape corresponding to the flange portion 5a communicating with the notch 27a is formed on the box 27. As a result, the rotating shaft portion 5 on the rear side is moved to
The notches 27a and 27b are engaged with and disengaged from the up and down direction, and are fixed in the axial direction with respect to the box 27 by the stopper action of the flange portion 5a.

The connecting shaft 40 is engaged with and disengaged from the front rotary shaft portion 5. That is, as shown in FIGS. 9 to 12, a cross-shaped connecting portion 5b is formed at the tip portion of the rotary shaft portion 5, while at the end portion of the connecting shaft 40, as shown in FIG. As shown in FIG. 12, a box portion 40a having an engagement recess 40c into which the connecting portion 5b is fitted without rattling is formed.
Therefore, by sliding the connecting shaft 40 via the rod 43 by, for example, a pneumatic cylinder 42 or manually, the box portion 40a (the engaging recess 40
c) and the connecting portion 5b are disengaged, and the connecting shaft 4
0 and the front rotary shaft portion 5 are integrally rotatable. The rod 43 is connected to the connecting shaft 4 as shown in FIG.
It is fitted in an annular groove 40b formed on the outer periphery of the box portion 40a so as not to hinder the rotation of 0.

With the configuration as described above, the body W on which the rotating jig 1 is set in advance is lowered with respect to the carriage D in a state where the connecting shaft 40 is displaced to the right in FIG. The shaft portion 5 is supported by the boxes 26 and 27 so as to be rotatable and immovable in the front-rear direction. Then, the connecting shaft 40 (locking recess 40c) is engaged with (the connecting portion 5b of) the front rotary shaft portion 5 (the body W is rotatable). It should be noted that the body W can be removed from the dolly D in the reverse order of the procedure described above.

(Effect of the Invention) As is apparent from the above, the present invention suppresses the bending of the rotating jig itself by providing the reinforcing connecting portion when the vehicle body is rotated through the rotating jig. This is extremely advantageous in improving the durability of the rotating jig itself, preventing deformation of the automobile body, and obtaining stable rotation.

Of course, since the front end and the rear end of the automobile body are supported by the rotating jig, the weight of the automobile body is supported by the front and rear rotary shafts in a well-balanced manner. This is preferable in order to equalize the weight burden of the mounting portion with respect to the body as much as possible and to obtain stable rotation. Further, since the pair of front and rear mounting portions are provided so as to project forward or rearward with respect to the rotary shaft, the work of mounting the vehicle body on the mounting portions can be facilitated.

[Brief description of drawings]

FIG. 1 is an overall process diagram showing an embodiment of the present invention. FIG. 2 is a view showing a state in which the posture of the automobile body as an object to be coated is changed as the automobile body rotates. 3 and 4 are graphs showing the relationship between the thickness and sag of the coating material, the smoothness of the coated surface, and the rotation. FIG. 5 is a side view showing an example of a trolley for carrying a body and a rotating jig for rotating the body. FIG. 6 is a plan view of FIG. 5 showing a carriage and a rotating jig. FIG. 7 is a left side view of FIG. FIG. 8 is a perspective view showing a front portion of the rotating jig. FIG. 9 is a side sectional view showing the other side of the connecting portion between the rotating jig and the carriage. FIG. 10 is a sectional view taken along line X11-X11 of FIG. FIG. 11 is a plan view of FIG. FIG. 12 is a sectional view taken along line X13-X13 of FIG. 13 is a sectional view taken along line X14-X14 of FIG. FIG. 14 is a plan view of FIG. P1 to P4: Process W: Automobile body: Rotation axis D: Transport carriage K: Drive unit 1: Rotating jig 1F: Front side portion 1R: Rear side portion 2: Reinforcing connection portion 3: Continuous connection portion 4: Mounting portion 5: Rotating shaft part 11: Front side frame 12: Rear side frame 26, 27: Box (supporting part) 28, 29: Bearing 30: Support space 31: Transmission mechanism

Claims (1)

[Scope of utility model registration request] 1. A rotating jig used for rotating an automobile body as an object to be coated in a coating line, the jigs being arranged on the same straight line with a predetermined interval in the axial direction,
A pair of front and rear rotary shafts, each of which is a supported portion, is attached to the front end of the automobile body and is integrated with the front rotary shaft via a front continuous portion, and the front continuous shaft is connected to the front rotary shaft. A front side mounting portion that is erected rearward from the installation portion, and is attached to the rear end portion of the automobile body and is integrated with the rear side rotation shaft portion via a rear side continuous portion. Along with the rear side connecting portion, the rear side attaching portion erected forward from the rear side connecting portion and the front side connecting portion and the rear side connecting portion are connected to each other in the vicinity of the attaching portion to connect the pair of attaching portions. An automobile body rotating jig, comprising: a reinforcing connecting portion for restricting a change in the space, and a.