JPH0312573B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention supports a workpiece such as a bumper made of synthetic resin on a plurality of hangers on a rotary support stand housed in a tank. , relates to a plasma treatment device that performs plasma treatment on the surface of a workpiece using plasma gas injected from a plasma injection tube installed in a tank, thereby making it easier for paint to adhere to the surface of the workpiece. .

(Prior art) Conventionally, in this type of plasma processing apparatus,
It is known that a hanger provided in a tank for supporting a workpiece is shaped like a flat plate.

(Problems to be Solved by the Invention) In the above-mentioned conventional plasma processing apparatus, since the hanger is a simple plate-like object, there is a risk that the workpiece may move erratically on the hanger. Also, in order to prevent this, it may be possible to provide protruding walls or the like to prevent movement on both sides of the hanger, but in this case, the surfaces of both sides of the workpiece will not be exposed to the protrusions of the hanger. There is a problem in that the plasma gas is not effectively injected to the edge of the workpiece because it is blocked by the wall, and uniform plasma treatment cannot be performed over the entire surface of the workpiece.

Structure of the Invention (Means for Solving the Problems) The present invention has been made by focusing on the above-mentioned problems. Furthermore, even when plasma processing is performed with many large workpieces such as car bumpers stored in a tank, the surface of the workpieces is not shielded by a hanger, and the workpieces can be easily processed. Plasma gas is effectively distributed to the edges of the object, allowing uniform plasma treatment to be performed over the entire surface of the object.

First, the outline of the plasma processing apparatus of the present invention will be explained. In this plasma processing apparatus, a rotary support 6 is housed in a tank 1, and between a pair of rotary disks 11, 11 of the support 6, there is a A plurality of hangers 23 are provided so as to be relatively rotatable for supporting a workpiece W such as a resin automobile bumper. A plasma injection pipe 26 is disposed inside the tank 1, and the rotary disk 1 of the rotary support base 6
1 and 11 are being rotated, plasma gas such as oxygen is injected from this plasma injection tube 26 onto the workpiece W, and the surface of the workpiece W is subjected to plasma treatment.

Each hanger 23 is constructed between a supporting portion such as a pair of left and right side plates 27 whose upper end portions are relatively rotatably supported by the rotating disks 11, 11 of the rotary support base 6, and the lower end portions of the both side plates 27. connecting rod 3
0, and a plurality of supporting protrusions 3 protruding from the connecting rod 30 so as to support the inside of the workpiece W from below.
2, 33.

(Function) Therefore, in this plasma processing apparatus, when a workpiece W such as an automobile bumper is placed on the hanger 23, the plurality of supporting protrusions 32 and 33 move the inside of the workpiece W from the bottom surface. The workpiece W is supported so as to be lifted upward, and the workpiece W is stably supported on the hanger 23. In this state, the surface of the workpiece W is effectively exposed to the plasma gas up to its edges without being shielded, and the workpiece W
uniform plasma treatment is applied over the entire surface of the

(Example) Hereinafter, an example of a plasma processing apparatus embodying the present invention will be described in detail with reference to the drawings.

Now, as shown in FIG. 1, the tank 1 of the plasma processing apparatus of this embodiment has an entrance/exit 2 at one end thereof, and a lid 4 having a peephole 3 is attached to the entrance/exit 2 so as to be openable and closable. ing. A pair of rails 5 are disposed at a predetermined interval at the bottom of the tank 1 and extend over almost the entire length of the tank 1.

A rotary support 6 is movably supported on the rail 5 so as to be accommodated in the tank 1 so as to be able to be moved in and out. As shown in FIGS. 1 to 3, the rotary support base 6 is composed of a support frame 7 and a rotating body 8 supported on the support frame 7 so as to be rotatable around a horizontal axis. A plurality of wheels 9 that roll along the rail 5 are rotatably attached to both sides. The rotating body 8 has a central rotating shaft 10 and its rotating shaft 1.
A pair of left and right rotating disks 1 fixed near both ends of 0
1.

As shown in FIGS. 1 to 3, on the outside of the support frame 7, a gear 12 is fixed to the right end of the rotating shaft 10, and a sprocket wheel 13 is fixed to the left end. Corresponding to the sprocket wheel 13, a sprocket wheel 14 and a gear 15 are attached to the support shaft 1 on the left side plate of the support frame 7.
6, and a chain 17 is suspended between both sprocket wheels 13 and 14. A motor 18 is installed outside the tank 1.
is disposed and supported via a support plate 19, and its motor shaft 20 projects into the tank 1 via a bearing sleeve 21. A gear 22 is fixed to the inner end of this motor shaft 20, and a rotation support base 6 is fixed to the inner end of the motor shaft 20.
The gear 15 on the support frame 7 is engaged with and disengaged from the gear 15 as the support frame 7 is moved in and out.

As shown in FIGS. 1 and 2, a plurality of hangers 23 are supported relatively rotatably by support shafts 24 at the upper ends of the left and right sides of the rotary disks 11 of the rotary support base 6, and The inner side of a workpiece W such as a synthetic resin automobile bumper can be supported from below. On the inner circumferential surface of the tank 1, in correspondence with the workpiece W, there are a plurality of lines located at approximately equal angular intervals in the circumferential direction (in the embodiment, lines are located at angular intervals of 90 degrees). A plurality of support fittings 25 are provided protrudingly on each of the four lines), and each of the support fittings 25 on one or more arbitrary lines has a plasma injection tube 26 having a large number of injection ports (not shown) on the outer periphery. is supported. And this plasma injection tube 2
Plasma gas such as oxygen is injected into the tank 1 from the injection port 6, and the surface of the workpiece W in the hanger 23 is subjected to plasma treatment.

Next, the configuration of the main part of the present invention will be explained. As shown in FIGS. 1, 2, and 4, each hanger 23 in this embodiment is provided with a pair of side plates 27 as supporting parts on both left and right sides thereof, and the upper end thereof It is supported by a support shaft 24 on the inner surface of the rotary disk 11 of the rotary support base 6 so as to be relatively rotatable. A notched window 28 is formed at the center of the lower part of each side plate 27, and a net 29 is stretched over the notched window 28 to allow passage of plasma gas.

Between the lower end front edges of the pair of left and right side plates 27, there is a
A connecting rod 30 made of a book rod is installed.
As shown in FIG. 4, at both left and right ends of the connecting rod 30, there is a support portion 31a extending rearward from the connecting rod 30, and a side plate 27 extending from the rear end of the supporting portion 31a.
A connecting portion 3 extending laterally toward the rear edge of the lower end of the
1b, and a connecting rod 30 from the rear end of the support portion 31a.
The reinforcing portion 31c extends obliquely toward the inner front toward the
A reinforcing frame 31 is provided.

A pair of front and rear edge support protrusions 32 are protruded on the support portion 31a of the reinforcing frame 31, and the upper end of the protrusion supports a workpiece W such as an automobile bumper inside at both the front and rear edges of the left and right ends. A support portion 32a for supporting from below is bent inwardly and downwardly. Moreover, a center support protrusion 33 is provided protrudingly on the support part 31a of the reinforcing frame 31 between the edge support protrusions 32, and the workpiece W is held at the upper end of the center support protrusion 33 inwardly at the front and rear center of the left and right ends. A support portion 33a for supporting the connecting rod 30 from below is bent inwardly and downwardly at a position higher than the support portion 32a of the edge support protrusion 32, and the front end of the support portion 33a is formed to support the connecting rod 30 from below. is combined with

Therefore, in the plasma processing apparatus configured as described above, when a workpiece W such as an automobile bumper is placed on the hanger 23, a plurality of supports provided on the reinforcing rods 31 at both ends of the connecting rod 30 Projection piece 3
The upper end support parts 32a and 33a of 2 and 33 engage with the lower surface of the workpiece W, respectively, and the workpiece W is stably supported from below on the hanger 23. In this state, since there is no shielding object on the surface of the workpiece W, the plasma gas injected from the plasma injection tube 26 evenly and effectively spreads over the workpiece W. Uniform plasma treatment is performed over the entire surface of W.

Note that the present invention is not limited to the configuration of the embodiment described above, and for example, the support portion 27 may have a plate shape,
It is also possible to use rod-shaped, net-shaped, lattice-shaped, etc., or to change the configuration of each part arbitrarily without departing from the spirit of the invention.

Structure of the Invention As detailed above, the present invention allows workpieces to be supported on a hanger in a stable state without fear of movement, and moreover, a large number of large workpieces such as automobile bumpers can be supported in a tank. Even when the workpiece is housed in plasma processing, the surface of the workpiece is not blocked by the hanger, and the plasma gas is effectively distributed to the edges of the workpiece, covering the entire surface of the workpiece. This provides an excellent effect in that uniform plasma treatment can be performed over the entire area.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a plasma processing apparatus embodying the present invention, FIG. 2 is a perspective view of the same apparatus, FIG. 3 is a partially enlarged side sectional view, and FIG. 4 is a partially enlarged perspective view of a hanger. be. In the figure, 1 is a tank, 6 is a rotating support, and 7 is a tank.
is a support frame, 8 is a rotating body, 23 is a hanger,
26 is a plasma injection tube, 27 is a side plate, 30 is a connecting rod, and 32 and 33 are supporting protrusions.

Claims (1)

[Scope of Claims] 1. A tank 1 for accommodating a workpiece W; and a plasma gas injection device provided in the tank 1 for injecting plasma gas to perform plasma treatment on the surface of the workpiece W. a pipe 26; a rotary support base 6 provided in the tank 1 and having a support frame 7 and a pair of rotary discs 11, 11 rotatably supported by the support frame 7; and between the rotary support discs 11, 11. a pair of opposing support parts 27, 27 provided in the rotary disks 11, 11 and rotatably supported by the rotary disks 11, 11;
A connecting portion 30 installed between the connecting portion 30 and a pair of supporting protrusions 32 and 3 that project upward from the connecting portion 30 and support the inside of the workpiece W from below.
3. A plasma processing apparatus comprising: a hanger 23 having a hanger 23; 2. The plasma processing apparatus according to claim 1, wherein the workpiece is a bumper made of synthetic resin. 3. The plasma processing apparatus according to claim 2, wherein the support portion 27 is provided with a cutout window 28.