JP2818397B2 - Movable seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in, for example, a cleaning apparatus, and the like. A shaft through which a fluid is ejected from the tip is inserted, and the ejection is performed in a state where the shaft can be moved in a plane perpendicular to the axis of the shaft. The present invention relates to a movable seal capable of preventing a fluid from splashing back to a proximal end of a shaft.

[0002]

2. Description of the Related Art Conventionally, a movable seal such as that disclosed in Japanese Utility Model Application Laid-Open No. 63-66194 has been used for a cleaning apparatus as disclosed in Japanese Patent Publication No. 2-48382 by the present applicant. Have been. The configuration of this movable seal according to the prior art is shown in FIGS. 9, 10 and 11. FIG. 9 is a plan view showing a state where the shaft is located at the center, FIG. 10 is a longitudinal sectional view showing the state shown in FIG. 9, and FIG. 11 is a plan view showing a state where the shaft is maximally shifted to one corner.
The movable seal is formed by stacking a plurality of covers 3a to 3d formed with folded projections 2a to 2d around a plurality of rectangular plate bodies 1a to 1d in the order of size, and a recess 5 provided in the fixed wall 4. Attached to. Folded protrusion 2 of the largest cover 3a
The shape of a is adapted to the shape of the recess 5. A boss 7 for holding the seal 6 is provided at the center of the smallest cover 3d, and forms a shaft sealing portion 8. Each cover 3a
The surfaces on which the plate bodies 1a to 1d slide to each other form a watertight portion 9. A shaft 11 that can be slid and displaced in the axial direction perpendicular to the surfaces of the plate bodies 1a to 1d is inserted through the central boss 7 of the movable seal 10 as described above. Smallest cover 3
Holes 12a to 12c smaller than the outer shapes of the covers 3b to 3d, which are one step smaller, are formed in the other covers 3a to 3c except for d. Holes 12 in covers 3a and 3b
a and 12b are formed so as to be larger than the holes 12b and 12c of the covers 3b and 3c, which are one step smaller.

[0003] In the movable seal 10, the smallest cover 3d through which the shaft 11 is inserted is formed by the folded protrusion 2d.
Can relatively move until it comes into contact with the folded protrusion 2c of the cover 3c which is one step larger from the inside. When the shaft 11 further moves in the plane direction with the folded protrusion 2d in contact with the folded protrusion 2c, the cover 3d
Along with c, it is possible to move until the folded projection 2c of the cover 3c comes into contact with the folded projection 2b of the cover 3b, which is one step larger. By repeating such movements sequentially, the shaft 11 can move in a plane direction to a corner as shown in FIG. The size of each of the holes 12a to 12c is such that the watertight portion 9 between the plate bodies 1a to 1d can be secured even when the state shown in FIG. 11 is reached, and until the folded projections 2a to 2d abut. ,
It is necessary to have a dimensional relationship that does not make contact with the shaft 11.

[0004] If such a movable seal 10 is used,
When the cleaning liquid is sprayed from the tip of the shaft 11 at a high speed, the position at which the cleaning liquid is sprayed can be three-dimensionally changed, and the cleaning liquid that hits the object and rebounds can be prevented.

[0005]

When the movable seal 10 as shown in FIGS. 9, 10 and 11 is used in the cleaning device, the cleaning liquid may be applied to the watertight portion 9 between the plates 1a to 1d. In the watertight part 9, since the plurality of covers 3a to 3d are stacked, a water film is formed on the sliding part between the plate bodies 1a to 1d, the adhesion between the covers 3a to 3d increases, and the resistance increases. This makes sliding displacement difficult. When the resistance of the movable seal 10 to planar movement in the X-axis and Y-axis directions increases, the load on the planar positioning mechanism of the shaft 11 increases, the driving source increases in size, energy consumption increases, and manufacturing costs increase. Also rises.

[0006] An object of the present invention is to provide a movable seal capable of easily preventing formation of a water film and always performing smooth sliding.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a plurality of covers each having a plate-like shape, a folded projection formed around the cover, and having a substantially similar outer shape are laminated in the order of size, and the smallest cover has a shaft. A fitting hole is formed, and the cover other than the smallest cover has a hole smaller than the outer shape of the cover one step smaller,
In the movable seal, which is formed so as to be larger in the stacking order and allows the shaft to move in a plane while maintaining a watertight state between the covers, a convex portion for spacing the contact surface between the covers is provided at each interval. The movable seal is provided on a surface of a cover facing the movable seal. According to the present invention, the intervals between the contact surfaces between the covers are separated by providing a convex portion on the surface of the cover. The provision of the projections can prevent the entire contact surfaces from contacting each other and forming a water film, thereby preventing the sliding resistance from increasing. Since there is no need to increase the driving force required to move the shaft in a plane, the driving source can be reduced in size and energy can be saved.

In the present invention, the projection is formed as a plurality of projections. According to the present invention, since the projections are formed by the plurality of projections, the contact between the covers is in a point contact state, and the sliding resistance during planar movement can be significantly reduced.

In the present invention, the convex portion is formed as a continuous streak. According to the present invention, since the convex portion is formed as a continuous streak, while avoiding surface contact between the covers to prevent an increase in sliding resistance due to formation of a water film, liquid may also leak to the surroundings from the space between the covers. Can be prevented.

[0010]

FIG. 1 shows a schematic configuration of a movable cover 20 according to an embodiment of the present invention. The movable portion of the movable seal 20 is formed by laminating covers 23a to 23d, each of which has folded projections 22a to 22d formed around rectangular plates 21a to 21d. That is, the next largest cover 23b is stacked on the largest cover 23a, and a third-size cover 23c is further stacked thereon, and the smallest cover 23d is stacked on the top. The largest cover 23a has a folded projection 22a that fits into a recess 25 provided in the fixed wall 24. A seal 26 is provided at the center of the smallest cover 23d.
And a shaft sealing portion 28 is formed. The laminated surface between the plate bodies 21a to 21d of the covers 23a to 23d forms a watertight portion 29, and a projection 30 which is a convex portion is formed to keep a slight interval. The projections 30 are formed on the lower surfaces of the plates 21b to 21d of the covers 23b to 23d except for the largest cover 23a arranged at the lowermost stage, for example. The height of the projections 30 is
The thickness is about d.

The shaft seal 28 of the uppermost cover 23d has
The shaft 31 is inserted. Shaft 31 to shaft seal 28
When the movable seal 20 is inserted into the
a to 21d, a displacement in a direction parallel to the X-axis and a Y-axis in a plane parallel to the surfaces of the shafts a to 21d, a displacement in a direction of an axis 31a of the shaft 31 parallel to a Z-axis perpendicular to the XY plane,
Angular displacement about one axis 31a is possible.

In order to enable the movement of the shaft 31 in the XY plane, the covers 23a to 23
It is necessary to form holes 32a to 32c in 3b, respectively. Folded projections 22a-22 of each cover 23a-23d
d and a hole 32 provided in each of the covers 23a to 23c
The dimensional relationships required for a to 32c are shown in FIGS.
Are equivalent to the dimensional relationships required for the folded projections 2a to 2d of the covers 3a to 3d and the holes 12a to 12c of the covers 3a to 3c. That is, the lowermost cover 23a
The size of the hole 32a provided in the second stage cover 2
3b is formed so as to be smaller than the outer shape of the folded projection 22b and larger than the hole 32b provided in the second-stage cover 23b. Second stage cover 23b
Is smaller than the outer shape of the folded protrusion 22c of the third-stage cover 23c.
3c is formed larger than the hole 22c provided.
The hole 32c provided in the third-stage cover 23c is smaller than the shape of the folded projection 22d of the uppermost cover 23d, and the shaft 31 is shifted from the center so that the folded projection 22d is one step below the folded projection of the cover 23c. The dimensional relationship is formed such that the hole 32c does not come into contact with the shaft 31 even when the shaft 32 comes into contact with the shaft 22. Therefore, covers 23a-2
3c is a folded projection 22a to 22c and a hole 32a to
In the XY plane direction including 32c, the shape is substantially similar.

FIG. 2 shows the cover 23 forming the projection 30.
The details of the protrusion 30 for the cover 23b among the parts b and 23d are shown. The other covers 23c are exactly the same, and the smallest cover 23a is not the hole 32b in the center, but the shaft seal 2
8 is formed except that 8 is formed. Also, protrusion 3
Although 0 is formed so as to protrude on the lower surface side of the plate body 21b, it can be formed so as to protrude on the upper surface. In that case, the same configuration is applied to the largest cover 23a. FIG. 2A shows the shape of the upper surface side when the protrusion 30 is formed by punching or the like.
(B) shows a cross-sectional shape around the protrusion 30 formed by punching. When formed by punching, the projection 30 protrudes as a projection on the lower surface side of the plate 21d, and the upper surface side corresponds to a depression. When the tip of the projection 30 is thin, the position where the projection 30 is formed is slid so that the projection 30 of the cover 23c on the cover 23b does not fit into the recess of the stacked cover 23b. It is necessary to shift in anticipation of the range. For example, the plate 21b
21d may be provided slightly inward from the outermost periphery. Further, as shown in FIG. 2C, the small piece 33 is not welded to the lower surface of the plate body 21b by welding or the like.
Is bonded, no irregularities are formed on the back surface of the surface to which the small pieces 33 are bonded, so that the condition for the position where the protrusion 30 is provided is eased.

FIG. 3 shows the shape of a cover 34 according to another embodiment of the present invention. The cover 34 can be used as a cover on which the movable seal 20 is laminated, similarly to the cover 23b in the embodiment of FIG. In this embodiment, instead of providing the protrusion 30 in the embodiment of FIG.
A continuous streak 35 is formed as a projection. Such projections are formed continuously as shown in FIG.
As shown in FIG. 3 (b), a processing method of projecting to one side by pressing or the like and denting to the other side,
As shown in (c), it can be formed by joining continuous wires 36 and the like by welding or the like. Stirrup 35
When the projections are formed, the streaks 35 are continuous, so that even if there is an interval between the covers 34, water tightness can be maintained. In the case of using the method of forming the streaks 35 by pressing as shown in FIG. 3B, the stirrups may be formed in a positional relationship such that the upper and lower streaks do not fit into the recesses on the back side. is necessary.

The protrusion 30 as shown in FIG.
As shown in FIG.
In a case where the projection 34 protrudes on one side and is recessed on the other side, it is necessary to prevent the other projections overlapping each other from fitting into the recess. In addition, the protrusion 30 or the streak 35
If the holes 30 are fitted into the holes 32a to 32c, smooth sliding displacement is prevented. Therefore, it is necessary to form the protrusion 30 or the streak 35 at a position that does not fall into the holes 32a to 32c. The position satisfying such a condition is, for example, as shown in FIG.
, Each cover 23b-23d and 34
This is a position that is slightly closer to the inside than the outermost circumference. Covers 23a to 23c below the stacked covers 23a to 23d
When the projection 30 or the streak 35 is formed on the upper surface side of the hole 32, a position slightly outside the holes 32a to 32c is preferable.

FIGS. 4, 5, 6 and 7 show a configuration in which the movable seal 20 according to the embodiment of FIG. 4 is a front view of the cleaning device 40, FIG. 5 is a plan view, FIG. 6 is a right side view, and FIG. 7 is a partial cross-sectional view related to the movable seal 20. The cleaning device 40 is mounted on the underframe 41 and cleans a workpiece carried from the transport table 43 into the cleaning tank 42 by jetting a cleaning liquid at a high speed from a nozzle provided at the tip of the shaft 31. The shaft 31 is a quadrature robot 44
Is moved in the XY plane, and is moved up and down in the Z-axis direction by the elevating device 45. As a result, the cleaning liquid supplied from the cleaning liquid circulation device 46 and the pump 47 is intensively jetted to a necessary portion of the work, and the work can be efficiently cleaned. The washing liquid that rebounds from the work is blocked by the movable seal 20 and the orthogonal robot 4
A situation in which the cleaning liquid is applied to the lifting device 4 and the lifting / lowering device 45 can be prevented. Further, it is possible to prevent the cleaning liquid from being mist-like and leaking into the surrounding environment. Since there is no leakage of mist or the like in the surrounding environment, a control device 48 for controlling the cleaning device 40 and the like can also be arranged close to the cleaning tank 42.

As shown in FIG. 7, the lifting device 45 is connected to the movable seal 20 via an outer cylinder 49. The main shaft 50 as a shaft is displaceable in the Z direction on the same axis as the outer cylinder 49. The joint between the outer cylinder 49 and the movable seal 20 is performed by the cover 51. The outer cylinder 49 is held by the orthogonal robot 44 via a bracket 52 provided on the upper part, and can move in the XY plane. A spindle cover 53 is provided on the upper portion of the spindle 50, and a cleaning liquid is supplied through a rotary joint 54. Since the main shaft 50 is connected via the rotary joint 54, the main shaft 50 can also be angularly displaced around the axis.

FIG. 8 shows the relationship between the projections 80 and 81 and the cover 82 according to still another embodiment of the present invention. In this embodiment, a cover 82 having projections 80 and 81 formed on both upper and lower surfaces and a cover 83 having no projection are stacked to prevent surface contact between the covers 82 and 83. By combining the cover 82 having the projections 80 and 81 formed on both surfaces and the cover 83 having no projection,
The problem that the upper and lower protrusions are pushed into the recesses can be prevented.

The covers 23a to 23d, 3 described above
In Nos. 4, 82 and 83, although the folded projections 22a to 22d are formed on the outer peripheral side, they may be formed around the holes 32a to 32c. Such a configuration corresponds to, for example, the configuration disclosed in FIG. 4 of the aforementioned Japanese Utility Model Application Laid-Open No. 63-66194, in which a projection is formed to avoid surface contact. In addition, the movable seal 20
Describes an example in which the cleaning device 40 is used as a part of the cleaning device 40. However, the same applies to a machine such as cutting performed while spraying a cutting fluid, or a device that processes a work with the water jet itself. Can be used for Furthermore, although the case where the number of covers is four is described, the present invention can be similarly applied to other covers.

[0020]

As described above, according to the present invention, a very simple method of providing a convex portion for spacing the contact surface between each cover between a plurality of covers on the surface of the cover facing the space is provided. Thus, it is possible to prevent the contact surfaces from making surface contact with each other, prevent an increase in sliding resistance due to the formation of a water film, and secure a smooth sliding state. The force required to slide between the covers when the shaft is moved in a plane may be small, which makes it possible to reduce the size of the drive source, save energy, and reduce manufacturing costs.

Further, according to the present invention, the projections for maintaining the interval between the contact surfaces between the covers are formed as a plurality of projections, so that each cover is in a point contact state, and the sliding resistance is reduced. In addition, the driving force required for the plane movement can be reduced.

Further, according to the present invention, since the convex portion for preventing contact between the covers is formed as a continuous streak, it is possible to prevent an increase in sliding resistance while maintaining water tightness between the covers.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a partial perspective view, a cross-sectional view, and a partial cross-sectional view of another embodiment of the cover of the embodiment of FIG. 1;

FIG. 3 is a partial perspective view, a sectional view, and a partial sectional view of still another embodiment of the present invention.

FIG. 4 is a front view of a cleaning device using the movable seal according to the embodiment of FIG. 1;

FIG. 5 is a plan view of a cleaning device using the movable seal according to the embodiment of FIG. 1;

FIG. 6 is a right side view of the cleaning device using the movable seal according to the embodiment of FIG. 1;

FIG. 7 is a partial sectional view of a cleaning apparatus using a movable seal according to the embodiment of FIG. 1;

FIG. 8 is a partial sectional view showing still another embodiment of the present invention.

FIG. 9 is a plan view showing the configuration of a movable seal according to the prior art.

FIG. 10 is a longitudinal sectional view showing a configuration of a movable seal according to the prior art.

FIG. 11 is a plan view showing a moving state of a movable seal.

[Explanation of symbols]

 Reference Signs List 20 movable seal 21a to 21d plate 22a to 22d folded projection 23a to 23d, 34, 82, 83 cover 28 shaft sealing part 29 watertight part 30, 80, 81 projection 31 shaft 32a to 32c hole 33 small piece 35 stirrup 36 Wire 40 Cleaning device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16J 15/50 B24C 3/00 F16J 15/16

Claims (3)

(57) [Claims] 1. A plurality of covers each having a plate-like shape, a folded protrusion formed around the periphery, and having a substantially similar outer shape are stacked in order of size, and a shaft fitting hole is formed in the smallest cover, In the covers other than the cover, a hole smaller than the outer shape of the cover which is smaller by one step is formed so as to be larger in the stacking order, and a movable seal capable of moving the shaft in a plane while maintaining a watertight state between the covers. The movable seal according to any one of claims 1 to 3, wherein a convex portion for providing an interval between contact surfaces between the covers is provided on a surface of the cover facing each interval. 2. The movable seal according to claim 1, wherein the protrusion is formed as a plurality of protrusions. 3. The movable seal according to claim 1, wherein the projection is formed as a continuous streak.