JPH0243651Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) The invention is an automatic water polishing device for polishing automobile bodies after intermediate coating. This invention relates to an elevating automatic water grinding device that enables automatic water grinding.

(Prior art) For automobile bodies after intermediate coating, in order to remove defects such as spots contained in the intermediate coating surface and improve the adhesion of the subsequent top coating,
Water research will be held.

Conventionally, as shown in FIG. 5, a device for performing water polishing consists of a pressing device 52 attached to a pedestal 51 and a polishing device 53 suspended from the pressing device 52, and is mounted on a cart 54 and transported. The polishing wheel 56 of the polishing device 53 is rotated and pressed against the automobile body 55 that is being polished, and the brush of the polishing wheel 56 performs polishing.

More specifically, the pressing device 52 includes a support arm 57 that is pivoted to the pedestal 51 and suspends and supports the polishing device 53, and a connecting bar that is also swingably supported by the pedestal 54 and has a balance weight 58 attached to one end. 59, the other end of the connecting bar 59, and the polishing device 53
a connecting shaft 60 that connects the connecting bar 59;
a cylinder 63 supported by a trunnion 62 on the pedestal 51 and engaged with the link 61; and an absorber 65 fixed to the pedestal 54 and engaged with an arm 64 extending from the connection bar 59; It consists of

With such a configuration, when the cylinder 63 is now operated to the contraction side, the polishing device 53 swings due to the unbalanced load between the polishing device 53 and the balance weight 58, and the polishing wheel 56 is moved toward the automobile body 55 (roof). ). At this time, a bounce phenomenon occurs due to the reaction of the descending speed,
The absorber 65 absorbs the reaction and suppresses the occurrence of bounce. On the other hand, when the cylinder 63 is actuated to the extension side, the force is applied to the link 61, the connecting arm 59,
It is transmitted to the polishing device 53 via the connecting shaft 60, and the polishing wheel 56 is forcibly lifted. At this time, the presence of the balance weight 58 allows the polishing brush 56 to rise smoothly.

As shown in FIG. 6, in the polishing device, a motor 67 and the polishing wheel 56 are attached to both ends of a casing 66 for polishing the arm, and a motor pulley 68 and a timing belt 69 are connected between them.
a, intermediate pulley 70, timing belt 69b,
They are connected by a timing pulley 71 or the like.

(Problems to be Solved by the Invention) However, in the case of the conventional water polishing device described above, since the suspension system of the polishing device 53 does not have a special elevating function, the roof, hood, and trunk of the automobile body have large height differences. Since it is impossible to water-sand the two parts continuously, generally only the roof is polished using the water-sanding device, and the hood and trunk are polished separately by hand. When done manually, not only is the work efficiency lower, but it is also impossible to wet-grind uniformly in one direction over the entire surface, which tends to result in sharpening streaks, and problems such as spots remaining due to unsharpened parts occur. . Furthermore, when performing a water test on the center of the hood, for example, the user is forced to lean forward, which can cause back pain.

In addition, in the above conventional water polishing device, the pressing force of the polishing wheel 56 can be simply taken as the value obtained by subtracting the weight of the balance weight 58 from the own weight of the polishing device 53, but in general, the roof surface of the automobile body The strength is lower than that of the hood or trunk surface, so if a conventional water grinding device with a uniform pressing force is applied as is, problems such as distortion and uneven sharpening will occur depending on the target area. It happens.

(Means for Solving the Problems) In order to solve the above problems, the present invention aims at solving the problems described above.
In the device for automatic water grinding by continuously pressing against the hood surface, roof surface and trunk surface of the vehicle, the mount 51
A first parallelogram link is provided in which the lifting arm 3, which is swingably mounted in the vertical direction about the support shaft 1, is the base and the support shaft side is the fixed sides 5, 7. A second parallelogram link whose common side is the link 9 facing the lifting arm is provided above the quadrilateral link, and the polishing device 53 having the polishing wheel is attached to the first parallelogram link in the vertical direction. a direction in which the polishing device is swingably suspended from the shaft, and the polishing device is connected to the second parallelogram link via the shaft 14, and the load of the polishing device is offset against the second parallelogram link; A balance weight 15 is provided on the pedestal, and is connected to and disengaged from the second parallelogram link and the cylinder 10 that raises and lowers the polishing device by swinging the lifting arm of the first parallelogram link. a cylinder 17 for selectively positioning the polishing wheel in a non-polishing position away from the body and a polishing position in contact with the body; at least one auxiliary balance weight 2 that adds its own weight to the weight and separates from the balance weight when the lifting arm swings downward;
The gist is that the configuration is such that 0 is added.

(Function) In the lifting type automatic water polishing device configured as described above, the second parallel link also operates following the operation of the first parallel link, and the connection point between the polishing device and the cylinder that drives it is It is immobile, and the polishing device can be maintained in a constant posture through lifting and lowering. This makes it possible to continuously polish the hood, roof, and trunk surfaces of the car body. Moreover, when the polishing wheel moves from the hood surface or the trunk surface to the roof surface, an auxiliary balance weight can be added to the balance weight to reduce the pressing force of the polishing wheel, thereby improving the water polishing quality.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings. In the following figures, the same components as those shown in FIGS. 5 and 6 are designated by the same reference numerals, and their explanations will be omitted.

In FIGS. 1 to 4, reference numeral 1 denotes a first support shaft bridged over a pedestal 51, which is rotatably supported by a first bracket 2 fixedly mounted on the pedestal 51. Reference numeral 3 denotes a lifting arm, one end of which is fixed to the first support shaft 1, and the other end of which swings up and down in accordance with the rotation of the first support shaft. The lifting arms 3 are provided in a pair on the left and right in the width direction of the pedestal 51 (in the direction perpendicular to the plane of the paper in FIG. 1), and a second support shaft 4 is bridged between the other ends.

The polishing device 53 has the same components as the conventional polishing device shown in FIG. The support arm 57 is suspended and supported by the lower end of a support arm 57 rotatably attached to the support arm 57.

On the other hand, at the location where the first bracket 2 is installed on the pedestal 51, a second bracket 5 consisting of two plates appropriately spaced apart is arranged in parallel. A pair of left and right second brackets 5 are provided on a pedestal 51, and a rice cake 6 is bridged between them. and,
A third bracket 7 is protruded from a portion of the beam 6 that faces the support arm 57, and between the third bracket 7 and the second bracket 5 is a support shaft 1 that is vertically connected to the first support shaft 1. A third support shaft 8 is bridged so as to be parallel to.

Further, one end of a first connecting bar 9 is pivotally attached to the third bracket 7 using the third support shaft 8, and the other end of the first connecting bar 9 is attached to the supporting arm. It is pivoted to 57. That is, the lifting arm 3, the support arm 57, the second and third brackets 5, 7, and the first connecting bar 9 form a first parallelogram link.
An elevating cylinder 10 is attached to the pedestal 51, and its output shaft is connected to the elevating arm 3. As a result, the extension side of the lifting cylinder 10,
In response to the movement toward the contraction side, the lifting arm 3 swings up and down about the first support shaft 1, and the polishing device 53 moves up and down together with this.

Further, the third bracket 7 of the third support shaft 8
A first pressing arm 1 is attached upward to the part facing the
1 is provided protrudingly, and on the other hand, a bell crank 12 is pivotally attached to the support arm 57, and a second connecting bar 13 is bridged between them. These first pressing arm 11, bell crank 12, and second connecting bar 13 form a second parallelogram link with the first connecting bar 9 as a common link. The other end of a shaft 14 that connects one end to a polishing device 53 is connected to the bell crank 12, while a balance weight 15 is connected to one end of the third support shaft 8.
A first weight arm 16 is fixed. The weight of the balance weight 15 is smaller than the weight of the polishing device 53, and as a result, a descending force that is simply the weight of the polishing device 53 minus the weight of the balance weight 15 is generated on the polishing wheel 56. Accordingly, the bell crank 12 normally rotates counterclockwise (Figs. 3 and 4), and the second
The parallelogram link tilts and the balance weight 15 is lifted.

By the way, the pedestal 51 is provided with a pressing cylinder 17 via a trunnion 62, and a fork-shaped cylinder yoke 18 is fixed to the end of the output shaft.
is engaged with a second pressing arm 15' attached to the third support shaft 8. As a result, when the second cylinder 17 is actuated to the extension side, the downward force generated on the polishing wheel 56 is canceled, and the rotation of the bell crank 12 and the tilting of the second parallelogram link are restricted. will be done.

A second weight arm 19 has an auxiliary balance weight 20 at one end, and is rotatably attached to the third support shaft 8 while being located above the first weight arm 16. Thus, a lift arm 21 fixed to one end of the first support shaft 1 can engage with the second weight arm 19 via a cam follower 22.
As a result, when the lift arm 3 swings downward due to the operation of the lift cylinder 10, the first support shaft 1 and therefore the lift arm 21 rotate counterclockwise (Figs. 3 and 4). Following this, the second weight arm 19 rotates counterclockwise and the auxiliary balance weight 20 is lifted.
Conversely, the lifting arm 3 is moved by the operation of the lifting cylinder 10.
When the cam follower 22 swings upward, the lift arm 21 rotates clockwise (Figs. 3 and 4), and the engagement between the cam follower 22 and the lift arm 21 is finally released.
An auxiliary balance weight 20 is added to the balance weight 15. That is, the downward force generated on the polishing wheel 56 is reduced by the amount added by the auxiliary balance weight 20.

Note that 23 is a weight connected to the rear end of the lifting arm 3 in order to facilitate the lifting operation of the lifting arm 3.

The water polishing apparatus having such a configuration is usually installed in three series on the conveyance line of the automobile body 55, with different phases in the width direction of the pedestal 51, as shown in FIG.
When the car body 55 loaded on the trolley 54 and subjected to intermediate coating is carried into the water polishing process where the water polishing device is installed, the lifting cylinder 10 is moved to the retracted side in order to water polish the hood surface. The third
As shown in the figure, the elevating arm 3 swings downward about the first support shaft 1, and following this, the polishing device 53 descends while maintaining a constant posture. Subsequently, the pressing cylinder 17 is actuated to the contraction side, the second pressing arm 15 rotates counterclockwise, and following this, the second connecting bar 13 moves to the left in the figure, and its movement is It is transmitted to the polishing device 53 via the bell crank 12 and the shaft 14, and the polishing device 53
The casing 66' is swung as shown by the broken line in FIG. 1, and the polishing wheel 56 is pressed against the hood surface. At this time, the lift arm 21 rotates due to the lowering of the lifting arm 3, and the auxiliary balance weight 20 is lifted as shown in FIG. 3. Therefore, the pressing force Fd of the polishing wheel 56 in the above state is: The dead weight of the polishing device 53 is W,
If the weight of balance weight 15 is A, then the formula
Fd=W-A (however, for the sake of simplicity, the weights of the bell crank 12, shaft 14, weight arm 16, etc. are omitted).

The polishing wheel 56 has been rotated beforehand;
Polishing of the automobile body 55 moving on the conveyance line is started from the tip of the hood. The middle portion of the casing 66' of the polishing device 53 is bent at an angle of about 45 degrees, so that the entire hood surface can be polished without interfering with the roof. Then, a lift command is input near the rear end of the hood, the pressing cylinder 17 operates to the extension side, and at the same time, the elevating cylinder 10 also operates to the extension side, and the polishing wheel 56 moves toward the roof surface. At this time, due to the lift arm 3 rising, the lift arm 21
rotates in the opposite direction, and the auxiliary balance weight 20 is added to the balance weight 15. That is, the pressing force Fv of the polishing wheel 56 against the roof surface is expressed by the formula, where B is the weight of the auxiliary balance weight 20.
It is given by Fv=W-(A+B), which is a smaller value than when polishing the hood surface.

Thereafter, as the automobile body 55 advances, a lowering command is input near the rear end of the roof, and the lifting cylinder 10
and the pressing cylinder 17 operate again to the contraction side,
The trunk surface is polished in the same manner as the hood surface.

In this way, it is possible to automatically polish the entire flat surface of the automobile body after the intermediate coating is applied, and the water polishing efficiency is significantly improved. Moreover, it becomes possible to polish with an appropriate pressing force depending on the target area, such as a hood or roof, and the quality of water polishing is significantly improved.

Incidentally, a series of operations such as raising and lowering and pressing are automatically performed by output signals from a control device (not shown).

Further, in the above embodiment, the number of auxiliary balance weights is one, but instead of this, a larger number of auxiliary balance weights may be added to vary the pressing force in multiple stages.

(Effects of the invention) As described in detail above, according to the invention, the posture of the polishing device can be kept unchanged through the ascent and descent. The polishing device can be moved freely to the trunk surface for automatic water sanding, significantly improving water sanding efficiency. Moreover, since it is possible to reduce the pressing force by adding an auxiliary balance weight to the roof surface, which is weak in strength, the water grinding quality can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the overall structure of the automatic water grinding device for flat surfaces according to the present invention, Fig. 2 is a perspective view showing its main structure, and Figs. 3 and 4 show its operating state. 5 is a side view showing the overall structure of a conventional water polishing device, and FIG. 6 is a sectional view showing the structure of the polishing device. 1, 4, 8... Support shaft, 3... Lifting arm, 9,
13... Connection arm, 10... Cylinder for driving the lifting arm, 11, 15'... Pressing arm, 12...
... Bell crank, 14 ... Shaft, 15 ... Balance weight, 17 ... Pressing arm drive cylinder, 20 ... Auxiliary balance weight, 51 ...
Frame, 53...polishing device, 57...support arm.

Claims (1)

[Scope of utility model registration request] In an automatic water polishing device that continuously presses a rotating polishing wheel 56 against the hood surface, roof surface, and trunk surface of an automobile body 55 being transported,
A first parallelogram link is provided on the pedestal 51, with the lift arm 3 attached to the frame 51 so as to be swingable in the vertical direction about the support shaft 1 as the base, and the support shaft side as the fixed sides 5, 7. A second parallelogram link whose common side is the link 9 facing the lifting arm is provided above the parallelogram link, and the polishing device 5 has the polishing wheel on the first parallelogram link.
3 is suspended so as to be swingable in the vertical direction, and the polishing device is connected to the second parallelogram link via the shaft 14, so that the load of the polishing device is applied to the second parallelogram link. A balance weight 15 is provided to apply a load in a direction that offsets the above, and a cylinder 10 and the second parallelogram are mounted on the pedestal for raising and lowering the polishing device by swinging the lifting arm of the first parallelogram link. A cylinder 17 is provided for selectively positioning a non-polishing position where the polishing wheel is separated from the body by engaging and disengaging from the link, and a polishing position where the polishing wheel is in contact with the body; An elevating type automatic water grinding device characterized in that at least one auxiliary balance weight 20 is attached, which adds own weight to the balance weight at times and separates from the balance weight when the elevating arm swings downward.